tag:blogger.com,1999:blog-88327696543691845522024-03-13T08:14:48.227-03:00Eletrônica em CasaEletrônica em casa, um blog de eletrônica para todos. Eletrônica analogica/digital/potencia simplificada. Circuitos, projetos, layout, softwares, microcontrolador e transmissor de forma simplificada.
Guilhermehttp://www.blogger.com/profile/01893157551344267377noreply@blogger.comBlogger42125tag:blogger.com,1999:blog-8832769654369184552.post-12144384236918424422016-09-17T14:41:00.001-03:002016-09-17T14:41:38.588-03:00Arduino Eclipse IDE<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhsnMg438B4B7dNGs0iHOweqjNNXTP606yfaJ8N5kxbAKrZ0fBg_ZNeHazZdoOzv1WnWjfTU94Rg3jIaK0Iz85oqUWuJKtMOokLrH56DJ8Jt9Jpc8062OdlstilXP-8cnD5eNAyNQDE1eTe/s1600/b31072ef285f6a78ba788b363feff22c.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="128" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhsnMg438B4B7dNGs0iHOweqjNNXTP606yfaJ8N5kxbAKrZ0fBg_ZNeHazZdoOzv1WnWjfTU94Rg3jIaK0Iz85oqUWuJKtMOokLrH56DJ8Jt9Jpc8062OdlstilXP-8cnD5eNAyNQDE1eTe/s320/b31072ef285f6a78ba788b363feff22c.png" width="320" /></a>Para quem começa aprender a programar com o Arduino, é muito comum utilização da IDE padrão fornecida pelos os desenvolvedores. Entretanto, com o aumento da experiência do programador, certas limitações da ferramenta ficam bastantes aparentes e a necessidade de utilizar outra ferramenta mais avançadas e com mais recursos acaba sendo inevitável. </div>
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Dentre as inúmeras alternativas disponível na internet, hoje eu vou apresentar a Arduino Eclipse IDE que dispões de inúmeros recursos interessantes. </div>
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Introdução</h3>
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O <a href="https://www.eclipse.org/" target="_blank">Eclipse</a> é uma plataforma "open source" e extensível que beneficia milhões de desenvolvedores em todo o mundo. A IDE do Eclipse foi desenvolvida inicialmente para o JAVA, porém suporta várias outras linguagens de programação por intermédio de plugins como C/C++, Scala, PHP e assim como para o desenvolvimento de programas para Arduino.</div>
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Para quem já usa o IDE Eclipse para a programação e gostaria de realizar programações para as plataformas Arduino, basta adicionar o plugin no seu Eclipse. Agora para quem não conhece os benefícios do Eclipse ainda, mas já é um simpatizante da IDE Arduino basta seguir os passos à seguir.</div>
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Instalação do Arduino Eclipse IDE</h3>
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A solução que eu irei apresentar é destinada e muito recomendada para quem é novo no Eclipse IDE Arduino, pois é a maneira mais simples de começar a usar a interface Arduino Eclipse, uma vez que o link que deixarei aqui agrupa em um único downloads todas as configurações necessárias! </div>
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Para o obter o Arduino Eclipse, vá até ao site do desenvolvedor Jan Baeyens e faça o download do arquivo. Existem duas opções uma para as maquinas de 64bits e outra para 32bites, baixe aquele que lhe convém. </div>
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<li><a href="http://eclipse.baeyens.it/stable.php?OS=Windows" target="_blank">http://eclipse.baeyens.it/stable.php?OS=Windows</a></li>
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<tr><td class="tr-caption" style="text-align: center;">Figura 1 - Download</td></tr>
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Feito o Download, basta descompactar o arquivo e recorte a pasta "sloeber" para um local de preferência do seu computador, por exemplo \C: ou Meus Documentos, Figura 2a.</div>
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Para finalizar a instalação abra como administrador o "sloeber-ide", Figura 2b. O programa vai se lançar e antes de abrir completamente, ele vai perguntar um local para a criação de uma pasta de trabalho "workspace" clique em ok.</div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgZeLZaJA0LL0cupzu0a6Wt-f1mvliXEMXtI0J5GaKMuWbP4nVolL3aICjtewoQjYDiQeFO0_GA_rTaGL30Fwq5hW-zXM4w4f5vwk-bQxQTLsRkPNKYzCvGC-G3nYYbs6eMNEyCPgjM7yDx/s1600/baixar5.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Instalação" border="0" height="270" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgZeLZaJA0LL0cupzu0a6Wt-f1mvliXEMXtI0J5GaKMuWbP4nVolL3aICjtewoQjYDiQeFO0_GA_rTaGL30Fwq5hW-zXM4w4f5vwk-bQxQTLsRkPNKYzCvGC-G3nYYbs6eMNEyCPgjM7yDx/s640/baixar5.png" title="Arduino Eclipse" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 2(a) Figura 2(b) </td></tr>
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Com isso, o programa abrirá por completo e em seguida vai começar a fazer as utilizações para a configuração automática dos "plugins" para o Arduino, Figura 3.</div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhR6RrzwnyKDwTtMWyNzlVjCAx9YUceLvvOm8-xaCbLkH1OEdYgJugA6LwYltI1qnPxRTeTFALpOZ6IWFtKtePZfqXSg1Drvp0ko8mwRbfn5ka8oI9ZIYHVAX4GwPjDGHe5q1dr47t2k_jD/s1600/baixar7.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Arduino Eclipse Instalação" border="0" height="302" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhR6RrzwnyKDwTtMWyNzlVjCAx9YUceLvvOm8-xaCbLkH1OEdYgJugA6LwYltI1qnPxRTeTFALpOZ6IWFtKtePZfqXSg1Drvp0ko8mwRbfn5ka8oI9ZIYHVAX4GwPjDGHe5q1dr47t2k_jD/s400/baixar7.png" title="Arduino Eclipse V3.0" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 3</td></tr>
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Finalizado os downloads, o Arduino Eclipse vais estar pronto para ser usado. Feche a aba "Welcome". Você poderá observa os mesmo ícones presentes na Arduino IDE na parte superior da interface. Em "New Sketch", como na Arduino IDE, pode ser usado para criar um novo projeto. Os exemplos presentes na Arduino IDE também podem ser encontrados quando criamos um novo projeto com "New Sketch". </div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh-AD2gfBDWNhR33I2D87JPrEU257rMd8L7ASFkvDs1hKMsCVrZcVRZBQs2KcR5PrWTqKqT5jIDzd0ATVrz4ynqA7Lznt75Dn7zT0Qp3DfDWd8tY0ZUDVrNGwJ93yFiIZO7Rezg3TXh6NCx/s1600/baixar8.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Arduino Eclipse" border="0" height="277" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh-AD2gfBDWNhR33I2D87JPrEU257rMd8L7ASFkvDs1hKMsCVrZcVRZBQs2KcR5PrWTqKqT5jIDzd0ATVrz4ynqA7Lznt75Dn7zT0Qp3DfDWd8tY0ZUDVrNGwJ93yFiIZO7Rezg3TXh6NCx/s400/baixar8.png" title="Arduino Eclipse" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 4</td></tr>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjgy4CxwoQ_dpXNExlqGM55Nd5cnrf5xCA8Ts7cv0JmLO2M4AQKK0j1VIO6QtIbGf4oxwwogb_URedi7ixzknAfU1RUnvSPe3hePZdAdD6iBRfc1i8A4BG3unMg5AK7Z_f7mUjEPF0c1ls7/s1600/baixar9.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Arduino Eclipse" border="0" height="457" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjgy4CxwoQ_dpXNExlqGM55Nd5cnrf5xCA8Ts7cv0JmLO2M4AQKK0j1VIO6QtIbGf4oxwwogb_URedi7ixzknAfU1RUnvSPe3hePZdAdD6iBRfc1i8A4BG3unMg5AK7Z_f7mUjEPF0c1ls7/s640/baixar9.png" title="Arduino Eclipse" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 5</td></tr>
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Mais Informações</h3>
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Para maiores informações, eu recomendo a visita ao site de Jan Baeyens! </div>
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<li><a href="http://eclipse.baeyens.it/index.shtml" target="_blank">http://eclipse.baeyens.it/index.shtml </a></li>
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Assistam os vídeos para maiores esclarecimentos! </div>
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Guilhermehttp://www.blogger.com/profile/01893157551344267377noreply@blogger.com2tag:blogger.com,1999:blog-8832769654369184552.post-73243925451636252242016-04-28T17:50:00.000-03:002016-04-28T17:55:56.554-03:00Arduino Ethernet Shield W5100 - Tutorial como comunicar.<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiQb3oLZx9U1q68LbkozCz2703knWHFXPzX6NyBIDCGTD4xofotpkZ9iJ6-1vaG-NmfnioS4wI3_x78utKAxNZ_4df_pim6VNzeBwAQwKSHfm8GXdHh5C99fMxjyRaVamFeXfeoG7SAVaWK/s1600/arduinoethernetshield_connected_to_pc.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiQb3oLZx9U1q68LbkozCz2703knWHFXPzX6NyBIDCGTD4xofotpkZ9iJ6-1vaG-NmfnioS4wI3_x78utKAxNZ_4df_pim6VNzeBwAQwKSHfm8GXdHh5C99fMxjyRaVamFeXfeoG7SAVaWK/s1600/arduinoethernetshield_connected_to_pc.png" /></a>Boa parte das pessoas que trabalham com microcontroladores tem como objetivo comandar atuadores, ler sensores ou enviar informações remotamente. Dentre as tecnologias disponíveis e acessíveis para os entusiastas da eletrônica o Arduíno ganho um grande destaque nos últimos anos. Vários módulos foram desenvolvidos baseados na concepção do Arduíno. Dentre esses módulos o <i>Ethernet Shield W5100</i> possibilita o acesso de informações processados pelo Arduíno na sua rede local, mas também pode ser conectado a internet e permitir o monitoramento ou controle da sua aplicação em qualquer lugar do mundo.</div>
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Introdução</h3>
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Neste novo post vamos apresentar um pequeno tutorial para conectar o Arduíno na sua rede local de computador e dicas para a conexão com a internet. Um exemplo para comandar dois <i>Led’s</i> pelo <i>browser</i> de seu computador vai ser apresentado.</div>
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Como Comunicar com o <i>Arduíno Ethernet Shield W5100</i></h3>
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Para a realização do trabalho vocês irão precisar do <i>Arduíno Ethernet Shield W5100</i> e um cabo de rede, além é claro do seu <i>Arduíno</i>. A montagem é extremamente fácil de ser executada, pois basta acoplar o <i>Arduíno Ethernet Shield W5100</i> ao seu <i>Arduíno</i> e com o cabo de rede conecta-se ao seu roteador para que em poucos minutos você possa monitorar seus sensores, chaves e <i>Led’s</i> através do <i>browser</i> do seu computador.</div>
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<tr><td class="tr-caption" style="text-align: center;">Figura 1 - <i>Arduíno UNO</i></td></tr>
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<tr><td class="tr-caption" style="text-align: center;">Figura 2 - <i>Arduíno Ethernet Shield W5100</i> </td></tr>
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O <i>Ethernet Shield W5100</i> é baseado no circuito integrado <i>Wiznet W5100</i> que já possui internamente todas as camadas do protocolo TCP/IP e UDP implementadas, sendo necessários somente comandos de acesso para disponibilizar a sua aplicação na rede. As Figuras 1 e 2 ilustram as placas que será usadas nesse tutorial. </div>
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Configuração do <i>Webserve</i></h4>
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Antes de começar a programar o seu <i>Arduíno</i> é necessário obter algumas informações da sua rede local para a correta configuração do módulo <i>Arduíno Ethernet Shield W5100</i>. O primeiro paço, portanto é seta corretamente um endereço de IP válido para a sua rede local. Este tutorial mostra como obter as informações pertinentes para o <i>Windows 7</i>, mas os mesmo princípios podem ser aplicados para outros sistemas operacionais.</div>
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Configurando o IP</h3>
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Vá ao menu INICIAR e, na caixa de diálogo, escreva o comando <b><i>CMD</i></b> e em seguida pressione ENTER. A Figura 3 apresenta esse primeiro passo.</div>
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<tr><td class="tr-caption" style="text-align: center;">Figura 3 - Abrindo o prompt de comando.</td></tr>
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Uma janela preta vai abrir na sua área de trabalho, essa janela é o prompt de comando do <i>Windows</i>. Nela digite o comando <b><i>ipconfig/all</i></b> e pressione enter. A Figura 4 ilustra o procedimento.</div>
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<tr><td class="tr-caption" style="text-align: center;">Figura 4 - Prompt de comando do Windows.</td></tr>
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Com a execução do comando <b><i>ipconfig/all</i></b> várias informações vão ser apresentadas na tela do <i>prompt</i>. Essas informações são relacionadas a configuração das placas de rede do seu computador e rede local. Identifique a sua placa de rede principal (aquela que está sendo usada) e colete as informações da sua conexão local (<b>Endereço IP</b>, <b>Máscara de sub-rede</b> e <b>Gateway Padrão</b>), pois você vai necessitar delas para configurar o <i>Arduíno Ethernet Shield W5100</i>. A Figura 5 demonstra como as informações vão estar no <i>prompt</i> de comando.</div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjq6X8QQdGbaSJO3cFfz2HpGd_S_luiSfwlUCj1rwBRTtM8MCtKGkDJ17a6JiVNLN8L_GOgqM8y0sJPSKShNoRdJNIVQPQT35LEYaG7ksgtS062W2FcVOXcdCQtYtMs5tTfuFKcoBtLk33l/s1600/prompt_comando.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="345" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjq6X8QQdGbaSJO3cFfz2HpGd_S_luiSfwlUCj1rwBRTtM8MCtKGkDJ17a6JiVNLN8L_GOgqM8y0sJPSKShNoRdJNIVQPQT35LEYaG7ksgtS062W2FcVOXcdCQtYtMs5tTfuFKcoBtLk33l/s640/prompt_comando.png" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 5 - Comando ipconfig/all.</td></tr>
</tbody></table>
<div style="text-align: justify;">
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<div style="text-align: justify;">
Copie em uma folha de papel ou no bloco de notas o Endereço de IP, Máscara e <i>Gateway</i>, pois essas informações devem ser definidos no início do programa que vai ser feita no próximo tópico. Entretanto o endereço de IP deve ser alterado em função das configurações locais da sua rede, veja o próximo passo.<br />
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<h3 style="text-align: left;">
Programa ser gravado no Arduíno</h3>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
O programa exemplo deste tutorial é apresentado mais a baixo. Você deve copia-lo no ID de programação do <i>Arduíno</i>. Porém <u><b>ANTES</b> de mandar gravar</u> o programa você deve alterar as configurações da rede mencionadas no tópico anterior de acordo com a <u>sua rede loca</u>. </div>
<div style="text-align: justify;">
Para isso, procure no início do programa as funções listadas a baixo: </div>
<ul style="text-align: justify;">
<li><b>IPAddress ip (192,168,1,177)</b>: Essa função define um endereço estático de IP para o <i>Shield</i>. O endereço deve ser trocado por um que possua um mesmo formato daquele que você copiou da janela do prompt de comando, porem o último número deverá ser diferente para não dar conflito com outros equipamentos conectado na sua rede. Por exemplo o IP do meu computador no momento dos teste era 192.168.1.66, logo eu deixe o IP do <i>Webserve</i> diferente tendo o final 177.</li>
</ul>
<ul style="text-align: justify;">
<li><b>IPAddress gateway(192,168,1,254)</b>: Nessa função, utilize o mesmo endereço fornecido do Gateway Padrão que você copiou na janela do prompt. Na minha rede local foi 192.168.1.254</li>
</ul>
<ul style="text-align: justify;">
<li><b>IPAddress subnet(255, 255, 255, 0)</b>: Também na Máscara de sub-rede utilize o mesmo que você copiou na janela do prompt. No meu caso foi 255.255.255.0.</li>
</ul>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
Pronto feito essas configurações preliminares, o programa pode ser gravado no seu Arduíno.<br />
<br /></div>
<div style="color: black; font-family: "arial"; font-size: 12px; line-height: 100%; overflow: auto; text-align: left; width: 650px;">
<pre> <span style="color: #95a5a6;">/*************************************************************** </span>
<span style="color: #95a5a6;"> Tutorial Ethernet Shield </span>
<span style="color: #95a5a6;"> Objetivo: Controle de led's pela Internet </span>
<span style="color: #95a5a6;"> Autor: Guilherme Vianna Santos </span>
<span style="color: #95a5a6;"> ***************************************************************/</span>
<span style="color: #5e6d03;">#include</span> <span style="color: #434f54;"><</span><b><span style="color: #d35400;">SPI</span></b><span style="color: #434f54;">.</span><span style="color: black;">h</span><span style="color: #434f54;">></span>
<span style="color: #5e6d03;">#include</span> <span style="color: #434f54;"><</span><b><span style="color: #d35400;">Ethernet</span></b><span style="color: #434f54;">.</span><span style="color: black;">h</span><span style="color: #434f54;">></span>
<span style="color: #00979c;">byte</span> <span style="color: black;">mac</span><span style="color: black;">[</span><span style="color: black;">]</span> <span style="color: #434f54;">=</span> <span style="color: black;">{</span><span style="color: black;">0xDE</span><span style="color: #434f54;">,</span> <span style="color: black;">0xAD</span><span style="color: #434f54;">,</span> <span style="color: black;">0xBE</span><span style="color: #434f54;">,</span> <span style="color: black;">0xEF</span><span style="color: #434f54;">,</span> <span style="color: black;">0xFE</span><span style="color: #434f54;">,</span> <span style="color: black;">0xED</span> <span style="color: black;">}</span><span style="color: black;">;</span> <span style="color: #434f54;">//MAC address </span>
<b><span style="color: #d35400;">IPAddress</span></b> <span style="color: black;">ip</span><span style="color: black;">(</span><span style="color: black;">192</span><span style="color: #434f54;">,</span><span style="color: black;">168</span><span style="color: #434f54;">,</span><span style="color: black;">1</span><span style="color: #434f54;">,</span><span style="color: black;">177</span><span style="color: black;">)</span><span style="color: black;">;</span> <span style="color: #434f54;">// IP da lan</span>
<b><span style="color: #d35400;">IPAddress</span></b> <span style="color: black;">gateway</span><span style="color: black;">(</span><span style="color: black;">192</span><span style="color: #434f54;">,</span><span style="color: black;">168</span><span style="color: #434f54;">,</span><span style="color: black;">1</span><span style="color: #434f54;">,</span><span style="color: black;">255</span><span style="color: black;">)</span><span style="color: black;">;</span><span style="color: #434f54;">// Gateway Padrão</span>
<b><span style="color: #d35400;">IPAddress</span></b> <span style="color: black;">subnet</span><span style="color: black;">(</span><span style="color: black;">255</span><span style="color: #434f54;">,</span><span style="color: black;">255</span><span style="color: #434f54;">,</span><span style="color: black;">255</span><span style="color: #434f54;">,</span><span style="color: black;">0</span><span style="color: black;">)</span><span style="color: black;">;</span> <span style="color: #434f54;">// Máscara de sub-rede</span>
<b><span style="color: #d35400;">EthernetServer</span></b> <span style="color: black;">server</span><span style="color: black;">(</span><span style="color: black;">8080</span><span style="color: black;">)</span><span style="color: black;">;</span> <span style="color: #434f54;">//porta de conexão </span>
<b><span style="color: #d35400;">EthernetClient</span></b> <span style="color: black;">client</span><span style="color: black;">;</span>
<span style="color: #00979c;">String</span> <span style="color: #d35400;">readString</span><span style="color: black;">;</span>
<span style="color: #00979c;">int</span> <span style="color: black;">flagLed2</span><span style="color: #434f54;">=</span><span style="color: black;">0</span><span style="color: black;">;</span> <span style="color: #434f54;">//Flag para comando do Led 2</span>
<span style="color: #00979c;">int</span> <span style="color: black;">flagLed1</span><span style="color: #434f54;">=</span><span style="color: black;">0</span><span style="color: black;">;</span> <span style="color: #434f54;">//Flag para comando do Led 1</span>
<span style="color: #00979c;">void</span> <span style="color: #5e6d03;">setup</span><span style="color: black;">(</span><span style="color: black;">)</span><span style="color: black;">{</span>
<span style="color: #d35400;">pinMode</span><span style="color: black;">(</span><span style="color: black;">5</span><span style="color: #434f54;">,</span> <span style="color: #00979c;">OUTPUT</span><span style="color: black;">)</span><span style="color: black;">;</span> <span style="color: #434f54;">//pin do LED1 </span>
<span style="color: #d35400;">pinMode</span><span style="color: black;">(</span><span style="color: black;">7</span><span style="color: #434f54;">,</span> <span style="color: #00979c;">OUTPUT</span><span style="color: black;">)</span><span style="color: black;">;</span> <span style="color: #434f54;">//pin do LED2 </span>
<b><span style="color: #d35400;">Ethernet</span></b><span style="color: #434f54;">.</span><span style="color: #d35400;">begin</span><span style="color: black;">(</span><span style="color: black;">mac</span><span style="color: #434f54;">,</span><span style="color: black;">ip</span><span style="color: #434f54;">,</span><span style="color: black;">gateway</span><span style="color: #434f54;">,</span><span style="color: black;">subnet</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">server</span><span style="color: #434f54;">.</span><span style="color: #d35400;">begin</span><span style="color: black;">(</span><span style="color: black;">)</span><span style="color: black;">;</span>
<b><span style="color: #d35400;">Serial</span></b><span style="color: #434f54;">.</span><span style="color: #d35400;">begin</span><span style="color: black;">(</span><span style="color: black;">9600</span><span style="color: black;">)</span><span style="color: black;">;</span> <span style="color: #434f54;">//Seta a velocidade para comunicação serial </span>
<b><span style="color: #d35400;">Serial</span></b><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"server/client 1.0 test"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<b><span style="color: #d35400;">Serial</span></b><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"Enviando um g na serial monitor para Client - Test"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">}</span>
<span style="color: #00979c;">void</span> <span style="color: #5e6d03;">loop</span><span style="color: black;">(</span><span style="color: black;">)</span>
<span style="color: black;">{</span>
<span style="color: #434f54;">// Verifica a comunicação Serial </span>
<span style="color: #5e6d03;">if</span> <span style="color: black;">(</span><b><span style="color: #d35400;">Serial</span></b><span style="color: #434f54;">.</span><span style="color: #d35400;">available</span><span style="color: black;">(</span><span style="color: black;">)</span> <span style="color: #434f54;">></span> <span style="color: black;">0</span><span style="color: black;">)</span>
<span style="color: black;">{</span>
<span style="color: #00979c;">byte</span> <span style="color: black;">inChar</span><span style="color: black;">;</span>
<span style="color: black;">inChar</span> <span style="color: #434f54;">=</span> <b><span style="color: #d35400;">Serial</span></b><span style="color: #434f54;">.</span><span style="color: #d35400;">read</span><span style="color: black;">(</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: #5e6d03;">if</span><span style="color: black;">(</span><span style="color: black;">inChar</span> <span style="color: #434f54;">==</span> <span style="color: #00979c;">'g'</span><span style="color: black;">)</span>
<span style="color: black;">{</span>
<span style="color: black;">}</span>
<span style="color: black;">}</span>
<b><span style="color: #d35400;">EthernetClient</span></b> <span style="color: black;">client</span> <span style="color: #434f54;">=</span> <span style="color: black;">server</span><span style="color: #434f54;">.</span><span style="color: #d35400;">available</span><span style="color: black;">(</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: #5e6d03;">if</span> <span style="color: black;">(</span><span style="color: black;">client</span><span style="color: black;">)</span>
<span style="color: black;">{</span>
<span style="color: #5e6d03;">while</span> <span style="color: black;">(</span><span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">connected</span><span style="color: black;">(</span><span style="color: black;">)</span><span style="color: black;">)</span>
<span style="color: black;">{</span>
<span style="color: #5e6d03;">if</span> <span style="color: black;">(</span><span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">available</span><span style="color: black;">(</span><span style="color: black;">)</span><span style="color: black;">)</span>
<span style="color: black;">{</span>
<span style="color: #00979c;">char</span> <span style="color: black;">c</span> <span style="color: #434f54;">=</span> <span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">read</span><span style="color: black;">(</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: #5e6d03;">if</span> <span style="color: black;">(</span><span style="color: #d35400;">readString</span><span style="color: #434f54;">.</span><span style="color: #d35400;">length</span><span style="color: black;">(</span><span style="color: black;">)</span> <span style="color: #434f54;"><</span> <span style="color: black;">100</span><span style="color: black;">)</span>
<span style="color: black;">{</span>
<span style="color: #d35400;">readString</span> <span style="color: #434f54;">+=</span> <span style="color: black;">c</span><span style="color: black;">;</span>
<b><span style="color: #d35400;">Serial</span></b><span style="color: #434f54;">.</span><span style="color: #d35400;">print</span><span style="color: black;">(</span><span style="color: black;">c</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">}</span>
<span style="color: #5e6d03;">if</span> <span style="color: black;">(</span><span style="color: black;">c</span> <span style="color: #434f54;">==</span> <span style="color: #00979c;">'\n'</span><span style="color: black;">)</span> <span style="color: black;">{</span>
<b><span style="color: #d35400;">Serial</span></b><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #d35400;">readString</span><span style="color: black;">)</span><span style="color: black;">;</span> <span style="color: #434f54;">//Mostra no Serial Monitor o debuging </span>
<span style="color: #434f54;">// HTML data header </span>
<span style="color: #5e6d03;">if</span><span style="color: black;">(</span><span style="color: #d35400;">readString</span><span style="color: #434f54;">.</span><span style="color: #d35400;">indexOf</span><span style="color: black;">(</span><span style="color: #00979c;">'?'</span><span style="color: black;">)</span> <span style="color: #434f54;">>=</span><span style="color: black;">0</span><span style="color: black;">)</span> <span style="color: black;">{</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"HTTP/1.1 Controle de LED's"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">}</span>
<span style="color: #5e6d03;">else</span> <span style="color: black;">{</span>
<span style="color: #95a5a6;">/*LED 1*/</span>
<span style="color: #5e6d03;">if</span><span style="color: black;">(</span><span style="color: #d35400;">readString</span><span style="color: #434f54;">.</span><span style="color: #d35400;">indexOf</span><span style="color: black;">(</span><span style="color: #005c5f;">"led1on"</span><span style="color: black;">)</span> <span style="color: #434f54;">></span><span style="color: black;">0</span><span style="color: black;">)</span> <span style="color: #434f54;">//checa se o led 1 foi aceso </span>
<span style="color: black;">{</span>
<span style="color: black;">flagLed1</span><span style="color: #434f54;">=</span><span style="color: black;">1</span><span style="color: black;">;</span>
<span style="color: #d35400;">digitalWrite</span><span style="color: black;">(</span><span style="color: black;">5</span><span style="color: #434f54;">,</span> <span style="color: black;">1</span><span style="color: black;">)</span><span style="color: black;">;</span> <span style="color: #434f54;">// set pin 5 high </span>
<b><span style="color: #d35400;">Serial</span></b><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"Led1 On"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">}</span>
<span style="color: #5e6d03;">if</span><span style="color: black;">(</span><span style="color: #d35400;">readString</span><span style="color: #434f54;">.</span><span style="color: #d35400;">indexOf</span><span style="color: black;">(</span><span style="color: #005c5f;">"led1off"</span><span style="color: black;">)</span> <span style="color: #434f54;">></span><span style="color: black;">0</span><span style="color: black;">)</span> <span style="color: #434f54;">//checa se o led 1 foi apagado </span>
<span style="color: black;">{</span>
<span style="color: black;">flagLed1</span><span style="color: #434f54;">=</span><span style="color: black;">0</span><span style="color: black;">;</span>
<span style="color: #d35400;">digitalWrite</span><span style="color: black;">(</span><span style="color: black;">5</span><span style="color: #434f54;">,</span> <span style="color: black;">0</span><span style="color: black;">)</span><span style="color: black;">;</span> <span style="color: #434f54;">// set pin 5 low </span>
<b><span style="color: #d35400;">Serial</span></b><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"Led1 Off"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">}</span>
<span style="color: #95a5a6;">/*LED 2*/</span>
<span style="color: #5e6d03;">if</span><span style="color: black;">(</span><span style="color: #d35400;">readString</span><span style="color: #434f54;">.</span><span style="color: #d35400;">indexOf</span><span style="color: black;">(</span><span style="color: #005c5f;">"led2on"</span><span style="color: black;">)</span> <span style="color: #434f54;">></span><span style="color: black;">0</span><span style="color: black;">)</span> <span style="color: #434f54;">// checa se o led 2 foi aceso </span>
<span style="color: black;">{</span>
<span style="color: black;">flagLed2</span><span style="color: #434f54;">=</span><span style="color: black;">1</span><span style="color: black;">;</span>
<span style="color: #d35400;">digitalWrite</span><span style="color: black;">(</span><span style="color: black;">7</span><span style="color: #434f54;">,</span> <span style="color: black;">1</span><span style="color: black;">)</span><span style="color: black;">;</span> <span style="color: #434f54;">// set pin 7 high </span>
<b><span style="color: #d35400;">Serial</span></b><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"Led2 On"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">}</span>
<span style="color: #5e6d03;">if</span><span style="color: black;">(</span><span style="color: #d35400;">readString</span><span style="color: #434f54;">.</span><span style="color: #d35400;">indexOf</span><span style="color: black;">(</span><span style="color: #005c5f;">"led2off"</span><span style="color: black;">)</span> <span style="color: #434f54;">></span><span style="color: black;">0</span><span style="color: black;">)</span> <span style="color: #434f54;">// checa se o led 2 foi apagado </span>
<span style="color: black;">{</span>
<span style="color: black;">flagLed2</span><span style="color: #434f54;">=</span><span style="color: black;">0</span><span style="color: black;">;</span>
<span style="color: #d35400;">digitalWrite</span><span style="color: black;">(</span><span style="color: black;">7</span><span style="color: #434f54;">,</span> <span style="color: black;">0</span><span style="color: black;">)</span><span style="color: black;">;</span> <span style="color: #434f54;">// set pin 7 low </span>
<b><span style="color: #d35400;">Serial</span></b><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"Led2 Off"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">}</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"HTTP/1.1 200 OK"</span><span style="color: black;">)</span><span style="color: black;">;</span> <span style="color: #434f54;">//Envia uma noga Página. </span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"Content-Type: text/html"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: #95a5a6;">/******************************Página em HTML******************************/</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"<HTML>"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"<HEAD>"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"<TITLE>Arduino - Teste LED's</TITLE>"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"</HEAD>"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"<BODY>"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"<div align='center'>"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"<a href='http://www.eletronicaemcasa.blogspot.com.br/' target='parent'>"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"<img alt='Eletronica em Casa' src='https://db.tt/YXraUkU9' width='120px'/></a><br/>"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"<H1>LED's - ON/OFF</H1>"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: #434f54;">//Led 1 - Controle de imagem </span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"<table border='1'><tr><th>Led's</th><th>Estados</th></tr>"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: #5e6d03;">if</span><span style="color: black;">(</span><span style="color: black;">flagLed1</span><span style="color: #434f54;">==</span><span style="color: black;">0</span><span style="color: black;">)</span>
<span style="color: black;">{</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"<tr><td><input type=submit value='LIGAR Led1' style=width:130px;height:45px onclick=\"document.location='led1on'\"/></td>"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"<td><img alt='Apagada' src='https://db.tt/AogtVLoV' width='80px'/></td></tr>"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">}</span>
<span style="color: #5e6d03;">else</span>
<span style="color: black;">{</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"<tr><td><input type=submit value='DESLIGAR Led1'"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"style=width:130px;height:45px onclick=\"document.location='led1off'\"/> </td>"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"<td><img alt='Ligada' src='https://db.tt/q5TsG0eL' width='80px'/></td></tr>"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">}</span>
<span style="color: #434f54;">//Led 2 - controle de imagem </span>
<span style="color: #5e6d03;">if</span><span style="color: black;">(</span><span style="color: black;">flagLed2</span><span style="color: #434f54;">==</span><span style="color: black;">0</span><span style="color: black;">)</span>
<span style="color: black;">{</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"<tr><td><input type=submit value='LIGAR Led2'"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"style=width:130px;height:45px onclick=\"document.location='led2on'\"/></td>"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"<td><img alt='Apagada' src='https://db.tt/AogtVLoV' width='80px'/></td></tr>"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">}</span>
<span style="color: #5e6d03;">else</span>
<span style="color: black;">{</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"<tr><td><input type=submit value='DESLIGAR Led2' style=width:130px;height:45px onclick=\"document.location='led2off'\"/> </td>"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"<td><img alt='Ligada' src='https://db.tt/q5TsG0eL' width='80px'/></td></tr>"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">}</span>
<span style="color: #434f54;">//bloqueio de acesso as páginas{led2on;led2off} </span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"<IFRAME name=inlineframe style=\"display:none\" >"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"</IFRAME>"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"</BODY>"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">println</span><span style="color: black;">(</span><span style="color: #005c5f;">"</HTML>"</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">}</span>
<span style="color: #d35400;">delay</span><span style="color: black;">(</span><span style="color: black;">1</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: black;">client</span><span style="color: #434f54;">.</span><span style="color: #d35400;">stop</span><span style="color: black;">(</span><span style="color: black;">)</span><span style="color: black;">;</span>
<span style="color: #d35400;">readString</span><span style="color: #434f54;">=</span><span style="color: #005c5f;">""</span><span style="color: black;">;</span>
<span style="color: #d35400;">readString</span><span style="color: #434f54;">=</span><span style="color: #005c5f;">""</span><span style="color: black;">;</span>
<span style="color: black;">}</span>
<span style="color: black;">}</span>
<span style="color: black;">}</span>
<span style="color: black;">}</span>
<span style="color: black;">}</span>
</pre>
</div>
<div style="text-align: justify;">
<br />
<br /></div>
<h3 style="text-align: left;">
Enviando informações pela Ethernet</h3>
<div style="text-align: justify;">
Acople o <i>Arduíno Ethernet Shield W5100</i> ao seu <i>Arduíno</i> e conecte o cabo de rede ao seu roteador e ao seu <i>Shield</i>. Dois <i>Led’s</i> com resistores devem ser ligados nos pinos 7 e 5, conforme a Figura 6 apresentada a baixo.<br />
<br />
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjsj69LjfbOpHCCHfqWJtOezKJ9O8FBD6EjQVYKZ0wCnx9Ui4VWKlGMjIARB5Itc_902WL2JAcV-q_PqCPDNBSmLJQjCr0EY5I27Jm6XUl3nhYJimW8dfLcfXMVuI2hCnAkingmSsYhgmj9/s1600/liga%25C3%25A7%25C3%25A3o2.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="283" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjsj69LjfbOpHCCHfqWJtOezKJ9O8FBD6EjQVYKZ0wCnx9Ui4VWKlGMjIARB5Itc_902WL2JAcV-q_PqCPDNBSmLJQjCr0EY5I27Jm6XUl3nhYJimW8dfLcfXMVuI2hCnAkingmSsYhgmj9/s400/liga%25C3%25A7%25C3%25A3o2.png" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 6 - Ligação dos<i> Led's</i> ao Arduino</td></tr>
</tbody></table>
<div class="separator" style="clear: both; text-align: center;">
</div>
<br /></div>
<div style="text-align: justify;">
Neste momento podemos enviar informações ao <i>WebServe</i> para comandar dois <i>Led’s</i> através de um browser. As informações são simples, sendo elas de ligar e desligar os <i>Led’s</i>.</div>
<div style="text-align: justify;">
</div>
<div style="text-align: justify;">
<br /></div>
<h4 style="text-align: justify;">
Teste da aplicação na rede local</h4>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
Para testar o funcionamento do sistema, basta abrir o seu browser predileto do seu computador e digitar na barra de endereço o IP seguido da porta de acesso que você configurou anteriormente no programa. Para os teste efetuados por mim o IP foi 192.168.1.177:8080 . A porta de acesso é definida pela função <span style="color: #d35400;"><span style="color: black;">"</span></span><i><b><span style="color: #d35400;">EthernetServer</span></b> <span style="color: black;">server</span><span style="color: black;">(</span><span style="color: black;">8080</span></i><span style="color: black;"><i>)</i>" e pode ser modificada pela usuário, entretanto é bom escolher uma porta livre da sua rede. </span>A Figura 7 ilustra a página criada no <i>Webserve</i>.</div>
<div style="text-align: justify;">
<br />
<div class="separator" style="clear: both; text-align: center;">
</div>
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi0Xg93zlD759OtgLNx1z3jV3VEwAyt1f6LJOpfVdag3shGrQ8HcUccMvcigX7p2kw_PdJ4zlagxXbG8_S9MvLJHi9JejkfYhM-JgEhppylyhTg-En8HFilq58nb3RZBp4Z6Q3YoteIyvXp/s1600/web.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="380" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi0Xg93zlD759OtgLNx1z3jV3VEwAyt1f6LJOpfVdag3shGrQ8HcUccMvcigX7p2kw_PdJ4zlagxXbG8_S9MvLJHi9JejkfYhM-JgEhppylyhTg-En8HFilq58nb3RZBp4Z6Q3YoteIyvXp/s400/web.png" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 7 - Teste via rede local.</td></tr>
</tbody></table>
<br />
<br />
Vale ressaltar que a aplicação só pode ser acessada na rede local.<br />
<br />
<br />
<h4>
Teste da aplicação via Internet </h4>
<br />
O exemplo mostrado aqui também pode ser controlado via internet em qualquer lugar do mundo, mas para isso a porta do roteador e o modem deve ser liberada (no caso a porta 8080 usado no exemplo). Dessa forma a porta 8080 passa a ser redirecionada para o IP associado ao Arduino acessando assim a página do <i>webserve</i> a partir do IP público, fornecido pelo provedor de internet.<br />
<br />
Para a liberação de porta do modem ou roteador podem ser feita através da sua rede local. Não irei entrar em detalhes do procedimento, pois as configurações mudam em função da marca dos equipamentos. Sugiro consultar o manual de instruções dos equipamentos ou buscar mais informações na internet.<br />
<br />
O IP público é o endereço de IP do seu modem na rede internet, para descobri-lo basta acessar sites como "meu ip" ou "localiza ip". Com o IP público do seu modem basta agora digita-lo no browser seguido da porta liberada (no meu caso 8080). Assim a conexão feita na porta 8080 vai ser associada pelo roteador ao IP do Arduino.<br />
<br />
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhfV_lJbcaiy-DpHQErfAvkI-baE5GcdzJQA4zEfZuXbD-pXs_-pxpsuQKXcSzEot4EzMGVWxKcdulfEaJ43PCENKV3qoZDs-0XAyTyEglsuv7nTj3aEEOvUROMxFmZ173NiZ7GrtLWnzZ6/s1600/web_intenet.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="381" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhfV_lJbcaiy-DpHQErfAvkI-baE5GcdzJQA4zEfZuXbD-pXs_-pxpsuQKXcSzEot4EzMGVWxKcdulfEaJ43PCENKV3qoZDs-0XAyTyEglsuv7nTj3aEEOvUROMxFmZ173NiZ7GrtLWnzZ6/s400/web_intenet.png" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 8 - Teste via rede internet.</td></tr>
</tbody></table>
<br />
<div class="separator" style="clear: both; text-align: center;">
<span id="goog_1336428481"></span><span id="goog_1336428482"></span></div>
<br />
No entanto, vale ressaltar que esta configuração não leva em
conta a segurança, permitindo que qualquer um que possua o IP controle o Led via internet. Implementações de segurança devem ainda ser criadas para uma aplicação final. </div>
<br />
<br />
<div style="text-align: justify;">
Confira o funcionamento no vídeo:<br />
<br />
<div class="separator" style="clear: both; text-align: center;">
<iframe allowfullscreen="" class="YOUTUBE-iframe-video" data-thumbnail-src="https://i.ytimg.com/vi/JMqxO_qs_i4/0.jpg" frameborder="0" height="266" src="https://www.youtube.com/embed/JMqxO_qs_i4?feature=player_embedded" width="320"></iframe></div>
</div>
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Guilhermehttp://www.blogger.com/profile/01893157551344267377noreply@blogger.com5tag:blogger.com,1999:blog-8832769654369184552.post-1651780211458755842015-12-01T12:35:00.003-02:002017-06-13T05:17:31.671-03:00Amplificador Estéreo com o LM386<div dir="ltr" style="text-align: left;" trbidi="on">
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<div style="text-align: justify;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgHsYB7N1USfILH1uIkcfDF-_2ngJ-kbZ2X2fJkw5h2gG55Z5TDdvOwD9pqB0ijKwT_lp0NwxMyaLOdL0nq7sYkzfPSJaD725LCyDs4mI7Ffq4vx6Qo0ELr848WlWqHe8dXaYnsIJUYBu8b/s1600/apresenta.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img alt="Stereo amplifier with LM386" border="0" height="224" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgHsYB7N1USfILH1uIkcfDF-_2ngJ-kbZ2X2fJkw5h2gG55Z5TDdvOwD9pqB0ijKwT_lp0NwxMyaLOdL0nq7sYkzfPSJaD725LCyDs4mI7Ffq4vx6Qo0ELr848WlWqHe8dXaYnsIJUYBu8b/s320/apresenta.png" title="Amplificador estéreo com o LM386" width="320" /></a><span lang="PT-BR" style="font-family: "times new roman" , "serif"; mso-bidi-font-weight: bold;">Confira a montagem de um <span style="font-family: "times new roman" , "serif";">A</span>mplificador <span style="font-family: "times new roman" , "serif";">Es</span>t<span style="font-family: "times new roman" , "serif";">é</span>reo com o LM386. O
Circuito Integrado LM386 é um pequeno amplificador de áudio de baixa potência,
ideal para pequenos projetos, tais como pequenos sintonizadores AM ou FM, caixa de som para
computador, MP3 e celulares.</span></div>
<span lang="PT-BR" style="font-family: "times new roman" , "serif"; mso-bidi-font-weight: bold;"> </span>
<br />
<div class="MsoNoSpacing" style="text-align: justify;">
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<br />
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<br /></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<br /></div>
<a name='more'></a><h2 style="text-align: left;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif"; font-size: large;">Introdução</span></h2>
<br />
<div style="text-align: justify;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";">O Circuito LM386 é um
amplificador de baixa potência projetado para aplicações de <span style="font-family: "times new roman" , "serif";">pequeno</span> consumo e níveis de
tensão reduzidos. O ganho interno deste circuito integrado é pré-fixado em 20
vezes (26db) <span style="font-family: "times new roman" , "serif";">com</span> um número de componentes reduzidos, mas com a adição externa
de um resistor e um capacitor entre os pinos 1 e 8 nós podemos aumentar o ganho
global do circuito para qualquer valor entre 20 a 200 vezes (26 a 46 db).<span style="font-family: "times new roman" , "serif";"> </span>O integrado LM386 drena uma baixa
potência quiescente da ordem de 24mW operando a 6V. O LM386 se torna ideal para
aplicações com uso de bateria.</span><br />
<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span style="font-family: "times new roman" , "serif";"> </span></span><br />
<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span style="font-family: "times new roman" , "serif";">Em um<span style="font-family: "times new roman" , "serif";"> post anterior (<a href="http://eletronicaemcasa.blogspot.com.br/2013/06/amplificador-de-audio-com-lm386.html" target="_blank">Amplificador de <span style="font-family: "times new roman" , "serif";">Áudio</span> com LM386</a><span style="font-family: "times new roman" , "serif";">)</span> <span style="font-family: "times new roman" , "serif";">utilizamos <span style="font-family: "times new roman" , "serif";">o LM386 para <span style="font-family: "times new roman" , "serif";">uma amplificador <span style="font-family: "times new roman" , "serif";">Mono, <span style="font-family: "times new roman" , "serif";">agora <span style="font-family: "times new roman" , "serif";">com uma pequena reformulação no circuito <span style="font-family: "times new roman" , "serif";">apresentamos<span style="font-family: "times new roman" , "serif";"> </span> uma a versão est<span style="font-family: "times new roman" , "serif";">éreo do amplificador com LM386. </span></span></span></span> </span></span></span></span></span></span></span></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<br /></div>
<h3 class="MsoNoSpacing" style="text-align: left;">
<b style="mso-bidi-font-weight: normal;"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Característica
de funcionamento do LM386</span></b></h3>
<div class="MsoNoSpacing" style="text-align: justify;">
<br /></div>
<ul style="text-align: left;">
<li><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Pode funcionar com baterias</span></li>
</ul>
<ul style="text-align: left;">
<li><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Necessita de poucos componentes
externos</span></li>
</ul>
<ul style="text-align: left;">
<li><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Tensão de operação entre 4 a 12V</span></li>
</ul>
<ul style="text-align: left;">
<li><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Ganho de tensão entre 20 (26db) a 200
vezes (46db).</span></li>
</ul>
<div class="MsoNoSpacing" style="text-align: justify;">
<br /></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";">Potência </span><span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span style="font-family: "times new roman" , "serif";">típica</span> </span>de saída do circuito integrado é de <span style="font-family: "times new roman" , "serif";">800</span>mW para uma
tensão de alimentação de 12V e alto-falante de 8 Ohms. A pinagem do </span><span lang="PT-BR" style="font-family: "times new roman" , "serif";">LM386 é dada na <i><span style="font-family: "times new roman" , "serif";">F</span>igura 1.</i> </span></div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhPReqs7Hm7KmfYgVl4C3HCCZiIxzT-3I70qbe0NQj6RlypXCBvVbtkIHnZMFkKwxEnOPK7Gy19SVQNlqoCyiVDFZaNLUEvvP7Ygg4SK1x4BeHaCwquuVU6MfBCwRCgArlJstxIMgMxAZCU/s1600/LM386.png" style="margin-left: auto; margin-right: auto;"><img alt="LM386 Eletronica em casa " border="0" height="158" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhPReqs7Hm7KmfYgVl4C3HCCZiIxzT-3I70qbe0NQj6RlypXCBvVbtkIHnZMFkKwxEnOPK7Gy19SVQNlqoCyiVDFZaNLUEvvP7Ygg4SK1x4BeHaCwquuVU6MfBCwRCgArlJstxIMgMxAZCU/s200/LM386.png" title="Pinagem do LM386 amplificados de audio" width="200" /></a></td></tr>
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Figura 1 - Pinagem do amplificador LM386.</h3>
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<b style="mso-bidi-font-weight: normal;"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Controle
de Ganho máximo</span></b></h3>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";">O LM386 é um amplificador versátil,
pois o seu ganho global de tensão pode ser ajustado por dois pinos (1 e 8). Com
os pinos 1 e 8 abertos o ganho é de 20 vezes (26db) mas se um
capacitor for colocado entre os pinos 1 e 8 o ganho é aumentado
para 200 vezes (46db). Se um resistor for colocado em série com o capacitor o ganho
pode ser ajustado entre 26db a 46db </span></div>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span style="font-size: large;">Montagem do Circuito amplificador com o LM386</span></span></h2>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";">O circuito elétrico completo do amplificador estéreo é apresentado na <i><span style="font-family: "times new roman" , "serif";">F</span>igura 2</i>. O circuito utiliza-se de dois CI's LM386 ligados independente. Cada LM386 é responsável em amplificar um canal de forma independente. O controle do volume é feito de modo simultâneo através de um potenciômetro duplo. Um regulador de tensão de 12V é utilizado para estabilizar o nível de tensão da fonte. </span><br />
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";">Os arquivos do projeto para a confecção da placa de circuito impresso podem ser baixados pelo Link: </span><br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgBGQCqZX07gH8tASHjB4B3WCvq3g8i3-Lb9dMl_r__jd2oTJP4Iu-hnltGklp8CHGR84WcZEdR4pHQZs1P6LBbsyy6eYiTj8PBucLfdfWqVdcmumYHIE4jL1jjjZTkH8M-zArrZr9RFyXR/s1600/Esquematico.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="443" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgBGQCqZX07gH8tASHjB4B3WCvq3g8i3-Lb9dMl_r__jd2oTJP4Iu-hnltGklp8CHGR84WcZEdR4pHQZs1P6LBbsyy6eYiTj8PBucLfdfWqVdcmumYHIE4jL1jjjZTkH8M-zArrZr9RFyXR/s640/Esquematico.png" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 2 - Esquema elétrico do amplificador Estéreo com o LM386.</td></tr>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";">A montagem do amplificador é feita em uma placa de circuito impresso. O circuito é ilustrado na <i><span style="font-family: "times new roman" , "serif";">F</span>igura 3.</i> A <i>Figura 3a</i> apresenta a disposição dos componentes na placa e a <i>Figura 3b</i> o layout da placa.A <span style="font-family: "times new roman" , "serif";"><i>Figura 4</i><span style="font-family: "times new roman" , "serif";"> mostra a montagem final na placa de circuito impresso<span style="font-family: "times new roman" , "serif";">.</span></span></span></span><br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgQwz3GPclw9LAGt3mPACASo8S2o1WlXW-F1NI3G3_4YucoVlHIvMI9pLuZTIpM7sJxQRVmcYzxyTn0GUcmEXYn36qqNEuOvjHgG5mN55Rmt3l7s6nrD6ppimLDRf92qFbDLew_zo8sON4M/s1600/layout.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="291" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgQwz3GPclw9LAGt3mPACASo8S2o1WlXW-F1NI3G3_4YucoVlHIvMI9pLuZTIpM7sJxQRVmcYzxyTn0GUcmEXYn36qqNEuOvjHgG5mN55Rmt3l7s6nrD6ppimLDRf92qFbDLew_zo8sON4M/s640/layout.png" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 3 - Layout do amplificador Estéreo.</td></tr>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgE4CgBL27R-gYdFgzlGan4UK3_rxdmUNg6nduuGYVwkhwBtrnAkk-EF-XJDhr1aaouxNeu6Due-6IbRmkc0qhodpB0h2H6RXkUGfPNr4kDoD6EcVfmMT0TNbM2ZlVFrpHBzKoD595_PfbB/s1600/Sem+t%25C3%25ADtulo.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img alt="LM386 stereo" border="0" height="304" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgE4CgBL27R-gYdFgzlGan4UK3_rxdmUNg6nduuGYVwkhwBtrnAkk-EF-XJDhr1aaouxNeu6Due-6IbRmkc0qhodpB0h2H6RXkUGfPNr4kDoD6EcVfmMT0TNbM2ZlVFrpHBzKoD595_PfbB/s640/Sem+t%25C3%25ADtulo.png" title="LM386 Estéreo" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 4 - Montagem do amplificador estéreo com LM386 na placa de circuito impresso.</td></tr>
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<span style="font-family: inherit;"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">O
circuito é alimentado por uma fonte de <i>12V - 500mA</i> através do conector FONTE. O regulador de tensão 7812 deve ser montado com um dissipador de calor. Nas
saídas de som (SAI-E e SAI-D) deve-se conectar um alto-falante de uso comum de impedância
de 8 ohms e potência mínima de 1W. O sinal de entrada de áudio (ENT-E e ENT-D) pode ser
proveniente de um <i>mp3</i> player, celular ou até mesmo do computador. Um cabo de áudio Estéreo deve ser montado para a conexão. </span></span><br />
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<span style="font-family: inherit;"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">A potência de saída total é de 2x830mW (%10THD) ou 2x700mW (%3THD) para auto falantes de 8 Ohms. </span></span><br />
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<h4>
Sugestão para a montagem final do Amplificador Estéreo com o LM386</h4>
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<span style="font-family: inherit;"><span class="st">A montagem final do amplificador foi feita com duas caixinhas de som da marca VICINI encontradas na sucata e que faziam parte de Home Theaters. A placa de circuito impresso foi alojada internamente assim como a fonte de alimentação (opcional, pois pode ser feita com um eliminador de pilhas 12V-500mA) ver <i>Figura 5</i>. </span></span> <br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi1Fgfb22D5HBE3xtWkXmNyhJqxrm6JpL7I-WTUHxThOdVjQqWn6ZSA5tRi-1WV5QGVA2VlI2woA5u2Ah7_n99rTQpjFvxxOIKhWfXrxRwm-GxjR5dOOaSw_P4Kt4DVwHVp5jHWxSDEWU4f/s1600/fotos.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img alt="Stereo amplifier with LM386" border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi1Fgfb22D5HBE3xtWkXmNyhJqxrm6JpL7I-WTUHxThOdVjQqWn6ZSA5tRi-1WV5QGVA2VlI2woA5u2Ah7_n99rTQpjFvxxOIKhWfXrxRwm-GxjR5dOOaSw_P4Kt4DVwHVp5jHWxSDEWU4f/s640/fotos.png" title="Amplificador estéreo com o LM386" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 5 - Montagem interna do circuito com fonte.</td></tr>
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<span style="font-family: inherit;">O acabamento externo para chave de Liga/Desliga, volume e entradas de áudio podem ser feitas na parte superior de uma das caixinhas com auxilio de uma mini-furadeira. Para o amplificador confeccionado optou-se por dois tipos de entradas, sendo elas P2 e RCA. A entrada P2 é ideal para interconexão entre equipamentos portáteis e a entrada RCA entre equipamentos de som e vídeo. A conexão entres os conectores para os plugs P2 e RCA é ilustrada na Figura 6. O conector P2 de 5 pinos funciona como um interruptor inibindo a entrada RCA quando um pino P2 é conectado.</span> </div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqrXI4wWu3uXaQTxDXRpPEJRBCzeRgwdrADKHGifuHbSSFQ58Svmn6d4Ly-1pXPFvGkL5xfK-9xTkpJ8HWyfEMCQv5Ri5oz3Wv9mNmL6mNj4SbvFj-131BBNy1sVSMYwAnhXe5suhBTt6g/s1600/fotos.bmp" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img alt="Stereo amplifier with LM386" border="0" height="216" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqrXI4wWu3uXaQTxDXRpPEJRBCzeRgwdrADKHGifuHbSSFQ58Svmn6d4Ly-1pXPFvGkL5xfK-9xTkpJ8HWyfEMCQv5Ri5oz3Wv9mNmL6mNj4SbvFj-131BBNy1sVSMYwAnhXe5suhBTt6g/s640/fotos.bmp" title="Conexão entre P2 e RCA" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 6 - Conexão elétrica entre os conectores P2 e RCA.</td></tr>
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A <i>Figura 7</i> apresenta a montagem final do amplificador estéreo baseado no LM386 nas caixinhas de som escolhidas. Outras caixinhas ou montagens podem ser testadas. </div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjI-DOQ3XivPNqGuw3m5LpdcL48XycUmBoGwPSUcy7Cjghm4GdOFJEhnl1-58bdzWKnR2ocYSXrjW1mRg3UwqWRmPK96Xj_F9NdtySYvK9rO89xY_sSeNz4PCPdL1gFWiocpWbgBd68X3oq/s1600/montagem+final.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Stereo amplifier with LM386" border="0" height="248" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjI-DOQ3XivPNqGuw3m5LpdcL48XycUmBoGwPSUcy7Cjghm4GdOFJEhnl1-58bdzWKnR2ocYSXrjW1mRg3UwqWRmPK96Xj_F9NdtySYvK9rO89xY_sSeNz4PCPdL1gFWiocpWbgBd68X3oq/s640/montagem+final.png" title="Amplificador estéreo com o LM386" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 7 - Montagem final do amplificador estéreo baseado no LM386.</td></tr>
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Downloads do projeto: <a href="https://www.dropbox.com/s/vj9snxo9gxq1ogs/LM386%20Amp%20Stereo.rar?dl=0" target="_blank">Amplificador Estéreo com o LM386</a> <br />
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span style="font-size: large;">Lista de Componentes do Amplificador</span></span></h2>
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<b><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Resistores</span></b></h3>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";">R1, R3 - 1k2 ohms 1/8W</span></div>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";">R2, R4 - 10 ohms 1/8W</span><br />
<span lang="PT-BR" style="font-family: "times new roman" , "serif";">P1 - Potenciômetro Duplo 10k ohms tipo Linear.</span></div>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><b>Capacitores</b> </span></h3>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";">C1,C5 - 10uF/25v eletrolítico</span></div>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";">C4, C8 - 220uF/25v eletrolítico</span></div>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";">C3, C7 - 47uF/25v eletrolítico</span></div>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";">C2, C6 - 47nF cerâmico</span></div>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";">C9 - 1000uF cerâmico</span></div>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">C10 - 100nF cerâmico</span></span></div>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";"><b>Semicondutores</b> </span></span></h3>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">CI1, CI2 - LM386 amplificador de áudio</span></span><br />
<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">CI3 - 7812 <span style="font-family: "times new roman" , "serif";">R</span>egulador de tensão 12V (Deve s<span style="font-family: "times new roman" , "serif";">er montado com dissipad<span style="font-family: "times new roman" , "serif";">or de calor)</span></span></span></span></div>
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<b><span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Diversos</span></span></b></h3>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Placa de fenolitico.</span></span></div>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">5 Bornes de conexão 2 vias.</span></span></div>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Fios.</span></span></div>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">2 Alto falantes de 1W com 8 Ohms de impedância.</span></span></div>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Fonte de 12V - <span style="font-family: "times new roman" , "serif";"><span style="font-family: "times new roman" , "serif";">50</span>0</span>mA.</span></span></div>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Plug P2 Estéreo macho.</span></span><br />
<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Plug P2 Estéreo fêmea.</span></span> </span></span></div>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Caixa para a montagem. </span> </span></div>
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<div style="text-align: center;">
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Guilhermehttp://www.blogger.com/profile/01893157551344267377noreply@blogger.com8tag:blogger.com,1999:blog-8832769654369184552.post-42662286498174950032015-11-02T11:15:00.000-02:002017-05-31T06:03:16.419-03:00Como Fazer um Autotransformador de Baixo Custo<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgb2wqk64LJ6JIyIvtDZjVQY7CLLGQmfMXpk2RLk0-QD_SeTyJShuiZtg9SWJQGnjfSmq8JB-Cpco3nZEANLpndOu_MY0H7ebXHzLcw010xo3AKy60YpN1jwsMyhVvRGrx_4Pg-9dXiWq0y/s1600/imagem-produtos-transformadores-auto-trafo-com-protecao-.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img alt="Como fazer um Autotransformador" border="0" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgb2wqk64LJ6JIyIvtDZjVQY7CLLGQmfMXpk2RLk0-QD_SeTyJShuiZtg9SWJQGnjfSmq8JB-Cpco3nZEANLpndOu_MY0H7ebXHzLcw010xo3AKy60YpN1jwsMyhVvRGrx_4Pg-9dXiWq0y/s320/imagem-produtos-transformadores-auto-trafo-com-protecao-.jpg" title="Autotransformador" width="320" /></a></div>
Quem já não teve problemas com os 110V/220V? Um certo equipamento que funciona em 110V não pode ser ligado na tomada 220V e já aquele que funciona em 220V não funciona em 110V. A solução é comprar um transformador ou um autotransformador, que no geral é muito caro e que pode não compensar. Mas afinal como esse tal de transformador e autotransformador funciona? São tudo a mesma coisa? Será que daria para fazer um conversor de 110V para 220V sem gastar muito? Neste post mostrarei como podemos reaproveitar um transformador para elevar a tensão de 110V para 220V. A solução é simples e de baixo custo! </div>
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Introdução - Transformador e Autotransformador</h3>
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Os transformadores e autotransformadores são considerados como uma máquina elétrica que transmitem uma potência elétrica de um circuito para outro através do fenômeno da indução eletromagnética. A determinação das grandezas, tensão e corrente, podem ser determinadas através dos princípios estudados em eletromagnetismo. Descobriu-se que é possível criar uma corrente elétrica em determinado circuito através de um fluxo magnético variável, esse fenômeno é conhecido como Lei de Faraday ou Lei da Indução Eletromagnética, por se tratar de um fluxo variável os transformadores e autotransformadores só funcionam em correntes alternadas [1]. A Figura 1 ilustra um transformador e o seu circuito equivalente.</div>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjbWGXSy1A-4L2ul7kRsR1d9h_DCDzn4WCTzmWxWG-frL6dAf_j1xc4MVR7pe9XwBWEn7FJwlDCKBy9Xj4NFoMij1re6fwwvbgfPHK__P85Yhi4BZSX3SsFSPWYwOALDI0_J8daTnuGJDOy/s1600/circuito67.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Como fazer um Autotransformador" border="0" height="125" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjbWGXSy1A-4L2ul7kRsR1d9h_DCDzn4WCTzmWxWG-frL6dAf_j1xc4MVR7pe9XwBWEn7FJwlDCKBy9Xj4NFoMij1re6fwwvbgfPHK__P85Yhi4BZSX3SsFSPWYwOALDI0_J8daTnuGJDOy/s320/circuito67.png" title="Transformador - Circuito equivalente" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 1 - Transformador para eletrônica e circuito equivalente.</td></tr>
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Uma importante diferença entre o transformador de dois enrolamentos e o autotransformador é o fato de que o transformador de dois enrolamentos estarem eletricamente isolados, ao contrario que os do autotransformador estão conectados diretamente entre si. Os autotransformadores possuem reatância de dispersão menor e maior eficiência [2]. A Figura 1 ilustra o circuito elétrico equivalente para um autotransformador.</div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiFwOjvzw8Nlf3r4tZ2tbsrJoP9EwHg-iR6PNVRARfQ9JKRWkmV3pabciHbDp6uus5XC-wazrlzZqUZsng2dejjrj7sP0IsKoMxO8s_o_yPqUjsU29mCX-e4T0I932DFYyHoTHvFk6Dt3uL/s1600/circuito6.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Como fazer um Autotransformador" border="0" height="156" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiFwOjvzw8Nlf3r4tZ2tbsrJoP9EwHg-iR6PNVRARfQ9JKRWkmV3pabciHbDp6uus5XC-wazrlzZqUZsng2dejjrj7sP0IsKoMxO8s_o_yPqUjsU29mCX-e4T0I932DFYyHoTHvFk6Dt3uL/s400/circuito6.png" title="Circuito equivalente autotransformador" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 2 - Autotransformador e seu circuito equivalente.</td></tr>
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Em um transformador comum, a potência é transformada inteiramente pelo fenômeno da indução, entretanto para um autotransformador a potência é transferida por indução e por condução. De fato, uma potência mais alta é obtida com um autotransformador uma vez que a potência de saída é o resultado da soma da potência impulsionada pela indução e da potência conduzida pelos fios de cobre [2].</div>
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Objetivo - Autotransformador de Baixo Custo (<span style="color: #cc0000;">reciclagem</span>).</h3>
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O objetivo do projeto é fazer um autotransformador de baixo custo para elevar a tensão de 110V para 220V através da reutilização de uma transformador comum encontrado em sucatas (Transformadores de uso geral em eletrônica). A elevação da tensão vai possibilitar que equipamentos em 220V de baixa potência funcionem na rede 110V. </div>
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O projeto - Adaptação de um Transformador para Autotransformador. </h3>
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Para utilizar um transformador comum do tipo ilustrado na Figura 3 como autotransformador algumas considerações devem ser feitas, pois essa máquina elétrica foi projetada para ser um transformador e não um autotransformado.<br />
Os <u>pontos mais importantes</u> a serem considerados é a c<u>apacidade de corrente suportada</u> nos enrolamentos e a<u> ligação dos enrolamentos</u>.</div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhbHbZfMuteQbBYx4AWRoYKcKqDsu08bfDw_hkaf0-DgsFP2H_BRmlIiEdgYAGHkW6JdZmujpadSTH7QQUtM3IX-THnK-5Q41ARKV81W1iFcLRoE2QoCLI0MASivopqlTf2rbD27Hb12vQC/s1600/transformador-12v-1a-110220v-hayama_iZ19XvZxXpZ1XfZ92116403-483346113-1.jpgXsZ92116403xIM.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Como fazer um Autotransformador" border="0" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhbHbZfMuteQbBYx4AWRoYKcKqDsu08bfDw_hkaf0-DgsFP2H_BRmlIiEdgYAGHkW6JdZmujpadSTH7QQUtM3IX-THnK-5Q41ARKV81W1iFcLRoE2QoCLI0MASivopqlTf2rbD27Hb12vQC/s200/transformador-12v-1a-110220v-hayama_iZ19XvZxXpZ1XfZ92116403-483346113-1.jpgXsZ92116403xIM.jpg" title="Adaptação de um transformador para autotransformador" width="200" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 3 - Transformador abaixador comum de uso geral em eletrônica.</td></tr>
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Um autotransformador pode ser gerado a partir dos enrolamentos primários de um transformador comum, as ligações necessárias para isso é apresentado na Figura 4.<br />
Em geral é comum encontrar transformadores com primário em duas bobinas (110 + 110V). Essas bobinas podem estar conectadas em um ponto ou não, sendo o mais comum o primário com três fios, como ilustrada na Figura 3 (fios Ver. Azu. Pret. Bobina conectada entre em si em um ponto ). <u>As bobinas do secundário não precisão ser conectadas</u>. <br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgcVwDut4EAvlU18ePjXtjrqpfwH4K0HpTKKB3mDlibIz_iK7J0CPD6vkzid3NkZi7uaAP0c8wUV3q7eEfNHKP8YqnO1ntyWkVL_U_xDQE5kg2DQrnGdglvOsiij54iZanOdXGwz0fK-TJu/s1600/conexao.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Como fazer um Autotransformador" border="0" height="165" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgcVwDut4EAvlU18ePjXtjrqpfwH4K0HpTKKB3mDlibIz_iK7J0CPD6vkzid3NkZi7uaAP0c8wUV3q7eEfNHKP8YqnO1ntyWkVL_U_xDQE5kg2DQrnGdglvOsiij54iZanOdXGwz0fK-TJu/s400/conexao.png" title="Adaptação de um transformador para autotransformador" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 4 - Conexão do primário para a configuração Autotransformador. </td></tr>
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Na sucata da Eletrônica em Casa um transformador de entradas de 110V/220V e saídas 9+9V/ 2,2A foi encontrado "dando sopa" (Figura 5). Esse transformador ligado na configuração autotransformador (Figura 4) vai fornecer uma tensão duas vezes maior.</div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjaN6C8M1h4ZuwDvuKdz-kGrRBJxGRFWpi5fKRMcJdCbRh58RDPgAFuo7r06WU2Ux-Ejsu66ASIFFeGtGjqJ7uCjfeCabTz7lHNDuxH248VtfcIkcACAyytUiqTtho2QwLCebPpiuouM_5Z/s1600/trafo+do+EC.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Como fazer um Autotransformador" border="0" height="181" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjaN6C8M1h4ZuwDvuKdz-kGrRBJxGRFWpi5fKRMcJdCbRh58RDPgAFuo7r06WU2Ux-Ejsu66ASIFFeGtGjqJ7uCjfeCabTz7lHNDuxH248VtfcIkcACAyytUiqTtho2QwLCebPpiuouM_5Z/s200/trafo+do+EC.png" title="Adaptação de um transformador para autotransformador" width="200" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 5 - Transformador usado 110/220V com saída 9+9V / 2.2A </td></tr>
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Mas qual é a potência máxima que esse novo circuito pode fornecer para um equipamento sem se danificar? Para responder essa pergunta basta saber qual é a corrente das bobinas primárias quando o transformador funciona em potência nominal!</div>
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Cálculos e considerações - Adaptação de um Transformador para Autotransformador</h3>
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<li>A Figura 6 ajuda a redimensionar um transformador para a reutilização como autotransformador.</li>
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<li>Com os dados do transformador (Figura 5) podemos descobrir a potência aparente nominal do transformador pela Equação (1).</li>
<li>Sendo:<i> </i></li>
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<li><i>Sp</i> - Potência aparente do primário<i>.</i><i> </i></li>
<li><i>Ss</i> - Potência aparente do secundário.</li>
<li><i>V<span style="font-size: x-small;">12</span></i> - Tensão de saída no secundário. </li>
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<i>S<span style="font-size: x-small;">s</span>=V<span style="font-size: x-small;">12</span>I<span style="font-size: x-small;">s</span></i> (1)<br />
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<i>S<span style="font-size: x-small;">s</span> = 9V*2.2A = 20VA</i></div>
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<i> </i>Assumindo um rendimento unitário no transformado da Figura 6, então a
corrente no primário pode ser obtida pelas Equações (2) e (3). Assim descobrimos a corrente do primário de <i>Ip</i>=0,182A. </div>
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<i>S<span style="font-size: x-small;">s</span>=S<span style="font-size: x-small;">p</span></i> (2) <i>I<span style="font-size: x-small;">p</span>=S<span style="font-size: x-small;">p</span>/V<span style="font-size: x-small;">ab</span> </i> (3)</div>
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<i> I<span style="font-size: x-small;">p</span>=20VA/110V = 0,182A</i></div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhzM9oLVD5pGoUOek6DIolYXW3d0BPV40EBkK5jF_ibI4vD2UtswM5JkKlkDa7DZFDH-JHKrQdmnw3dA-9bqMbUNoPG20S6J33T6m57ZVuTBe9BHQuIQgF4e1_MLcCvZlgsjFISex4zxqnE/s1600/transformador2.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Como fazer um autotransformador" border="0" height="187" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhzM9oLVD5pGoUOek6DIolYXW3d0BPV40EBkK5jF_ibI4vD2UtswM5JkKlkDa7DZFDH-JHKrQdmnw3dA-9bqMbUNoPG20S6J33T6m57ZVuTBe9BHQuIQgF4e1_MLcCvZlgsjFISex4zxqnE/s400/transformador2.png" title="Calculo para adaptar um transformador para autotransformador" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 6 - Calculo da potência nominal do transformador.</td></tr>
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<li>Portando, os fios dos enrolamentos primários suportam uma corrente de <i>0,182A</i>. Assumindo esse nível de corrente para o enrolamento que vai ser usado para elevar a tensão, enrolamento <i>b'c</i> na Figura 7 (<i>I<span style="font-size: xx-small;">2</span>=I<span style="font-size: x-small;">p</span></i>), podemos com auxílio da Figura 7 definir a potência fornecida na saída do nosso autotransformador, Equação (4). </li>
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<i>Ssaída</i> = <i>V<span style="font-size: x-small;">cb</span>*I<span style="font-size: x-small;">2</span></i> (4)<br />
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<i>S<span style="font-size: x-small;">cond</span>=V<span style="font-size: x-small;">ac</span>*I<span style="font-size: x-small;">2 </span></i><span style="font-size: x-small;"><span style="font-size: small;">(5)</span></span><i> </i><br />
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Onde: <i> </i></div>
<i>V<span style="font-size: x-small;">cb</span></i>=<i>V<span style="font-size: x-small;">ab</span></i> +<i> V<span style="font-size: x-small;">ac </span></i><span style="font-size: x-small;"><span style="font-size: small;">(6) e <i>I=I<span style="font-size: x-small;">2</span>+I<span style="font-size: x-small;">p </span></i>(7) </span></span><br />
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<i>S<span style="font-size: x-small;">saída</span>=220*0,182=40VA</i><br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhTF1tQEGcetvS9qiuIdEJ1-VjxAFffWHFX90TTab6byn4szMqsoKu7QFQvW8-CvsWs4Tdy4nzI0xkUyBnoc1kC0cBWntMja-CYcGIDG2QJvQrEdx5HYP0mBPt5nCFjO-NUEa3R1UVI9Rds/s1600/equacao.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Como fazer um autotransformador " border="0" height="215" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhTF1tQEGcetvS9qiuIdEJ1-VjxAFffWHFX90TTab6byn4szMqsoKu7QFQvW8-CvsWs4Tdy4nzI0xkUyBnoc1kC0cBWntMja-CYcGIDG2QJvQrEdx5HYP0mBPt5nCFjO-NUEa3R1UVI9Rds/s400/equacao.png" title="Calculos para adaptar um transformador para autotransformador" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 7 - Equacionamento para o autotransformador.</td></tr>
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Sendo:</div>
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<i>I<span style="font-size: x-small;">2</span></i> - Corrente do Secundário do autotransformador.</div>
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<i>Ip</i> - Corrente do Primário do autotransformador.</div>
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<i>I</i> - Corrente de entrada. </div>
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<i>Vab</i> - Tensão de entrada nos terminais <i>ab</i>.</div>
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<i>Vcb</i> - Tensão de saída nos terminais <i>cb</i>.</div>
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<i>Sentrada</i> - Potência aparente de entrada.</div>
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<i>Sp</i> - Potência aparente do primário transformador.</div>
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<i>Ssaída</i> - Potência aparente do secundário. </div>
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<li>Assim a potência que o nosso transformador conectado como autotransformador pode fornecer com segurança é 40VA, ou seja o dobro da potência nominal do transformador.</li>
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<i>Sentrada=S<span style="font-size: x-small;">saída</span> = S<span style="font-size: x-small;">p</span> + S<span style="font-size: x-small;">cond. </span></i><span style="font-size: x-small;"><span style="font-size: small;">(8)</span></span></div>
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<u>O dobro da potência nominal?</u> Sim, pois a potência de saída é composta por uma parte da potência induzida e outra da potência conduzida diretamente da fonte para a saída através do enrolamento, Equação (8). Ou seja, a potência de 20VA é proveniente da indução e os outros 20VA são conduzidos diretamente da rede elétrica. </div>
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Assim é importante notar que uma carga superior que 40VA conectado na saída do circuito há grandes chances de provocar a queima do autotransformador, pois a potência conduzida seria maior e uma sobre corrente passaria pelos enrolamentos de elevação de tensão (enrolamento <i>b'c</i>), causando um sobre aquecimento e curto circuito dos enrolamentos. </div>
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Montagem do circuito - Autotransformador</h4>
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A Figura 8 ilustra a montagem completa do circuito para fazer com que um transformador comum de eletrônica se transforme em uma autotransformador aumentador de tensão. Um Led pode ser adicionado na bobina secundária para indicar a energização do equipamento (ver Figura 8). <br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjj6FdZpbIYfHkuYOgrJwexafxO1hZrJb0vQohojII2gnnT6TVdGdfCuec3jYEcBc6z5sAeOaecDR-Xb5-qyGQKER_q3YvxgHM2LzKHyqST3rUBCcFQrODYLyEsajQ_WM9eAOwolrfE5kKq/s1600/ligacoes+2.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Como fazer um autotransformador" border="0" height="193" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjj6FdZpbIYfHkuYOgrJwexafxO1hZrJb0vQohojII2gnnT6TVdGdfCuec3jYEcBc6z5sAeOaecDR-Xb5-qyGQKER_q3YvxgHM2LzKHyqST3rUBCcFQrODYLyEsajQ_WM9eAOwolrfE5kKq/s640/ligacoes+2.png" title="Cicuito de um autotransformador adaptado" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 8 - Circuito de ligação final para a montagem.</td></tr>
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A montagem final do circuito pode ser visualizada na Figura 9. Nessa montagem foi reutilizado uma carcaça de um estabilizador de tensão que estava na sucata, essa carcaça possibilitou o reaproveitamento das tomadas de saídas para a conexão dos aparelhos. E claro que outras soluções podem ser utilizadas como fabricar a própria caixa ou utilizar uma outra carcaça disponível, a sua imaginação é o limite!<br />
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Para o teste de funcionamento, utilizou-se um umidificador de ar que funciona em 220V. Vale notar que a potência desse aparelho é de 20W (pode ser observado na Figura 9) , ou seja a metade da potência real disponível no autotransformador, o autotransformador funciona dentro dos limites de segurança! </div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgNxtYyXgdQ01IuQbICImGQSKgfHN61aYJCDSP27a9_Q_V3BrmI2OhdFJPwAN0ux4rog4qad1czs3VnCQFuxDOyyrBMHo-uu45JWVq0ezltUq3AfR_jkC3zgoLeqXWgvak8DzpKbzj280GR/s1600/Montagem2.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Como fazer um autotransformador" border="0" height="287" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgNxtYyXgdQ01IuQbICImGQSKgfHN61aYJCDSP27a9_Q_V3BrmI2OhdFJPwAN0ux4rog4qad1czs3VnCQFuxDOyyrBMHo-uu45JWVq0ezltUq3AfR_jkC3zgoLeqXWgvak8DzpKbzj280GR/s640/Montagem2.png" title="Autotransformador de baixo custo - faça você mesmo" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 9 - Montagem final do circuito em uma carcaça reaproveitada de um estabilizador.</td></tr>
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Conclusão</h3>
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Um transformador de uso comum pode ser reutilizado para funcionar como autotransformador. Vale ressaltar que a potência final (Segura) do seu autotransformador é
sempre o dobro da potência do transformador utilizado. Outro ponto
interessante é o fato da possibilidade do transformador poder funcionar
no sentido inverso, ou seja abaixar a tensão de 220V para 110V. </div>
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O interessante que um autotransformador de mesma potência é vendido no mercado livre entorno de 50 a 60 reais! Neste projeto foi gasto <b>Zero</b> reais para ser realizado, uma vez que o componentes foram inteiramente reciclados de sucatas. </div>
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[1] <a href="http://www.mundodaeletrica.com.br/qual-a-diferenca-entre-transformador-e-autotransformador/" target="_blank">Mundo da Elétrica</a>. <br />
[2]Máquinas Elétricas de Fitzgerald e Kingsley - 6ª Ed. 2008<br />
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Guilhermehttp://www.blogger.com/profile/01893157551344267377noreply@blogger.com8tag:blogger.com,1999:blog-8832769654369184552.post-26684975925673203372015-10-18T17:32:00.001-02:002021-06-09T02:49:16.472-03:00Aplicativo para Módulo Bluetooth com PIC - Tutorial<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjBcOHEVS2BZgdFWaxiElgJ4z-iNRiX0q14221Hy2233q477gpSfhjvS1XR1sLuA4sojCEyu2hHlWVuYA33IJNdwTxbMZVSqr3sAideZURFkIUnlo8kxBXSMPrHKU7ohRS1P-bJlvhQsa9D/s1600/apresenta%25C3%25A7%25C3%25A3o.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img alt="Sistemas de Domótica de baixo custo com o PIC" border="0" height="192" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjBcOHEVS2BZgdFWaxiElgJ4z-iNRiX0q14221Hy2233q477gpSfhjvS1XR1sLuA4sojCEyu2hHlWVuYA33IJNdwTxbMZVSqr3sAideZURFkIUnlo8kxBXSMPrHKU7ohRS1P-bJlvhQsa9D/s320/apresenta%25C3%25A7%25C3%25A3o.png" title="Tutorial Módulo Bluetooth com o PIC" width="320" /></a></div>
Que tal conectar seu <i>Smartphone</i> em um microcontrolador para automatizar sua casa? Verifique como fazer uma conexão <i>Bluetooth</i> com um microcontrolador e <i>Smartphone</i>. Aprenda a utilizar o módulo <i>Bluetooth HC-6</i> e envie comandos através do seu smartphone para ligar e desligar equipamentos. Deixe sua casa <i>HI-TEC</i> com o seu <i>Smartphone</i>. </div>
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Introdução ao Projeto - Aplicativo para Módulo Bluetooth com PIC</h3>
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O telefone celular do tipo <i>Smartphones</i> é considerado por muitas pessoas como uma extensão do corpo. As aplicações vão além do uso das chamadas telefônicas, pois recursos de interatividade são cada vez mais comuns como redes sociais, e-mail e internet. Mas que tal deixar seu Smartphone ainda mais interativo através do controle automático de sua residência na palma de sua mão?<br />
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Essa ideia de automatizar os ambientes residenciais e comerciais é conhecido como <i>domótica</i> e vem se popularizando em pouco tempo. Iremos nesse artigo mostrar de forma simples como conectar um microcontrolador ao seu <i>Smartphone</i> para enviar comandos através de uma comunicação <i>Bluetooth</i>. </div>
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O Projeto </h3>
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O objetivo do projeto é a realização de um aplicativo que gerencie uma comunicação <i>Bluetooth</i> entre um <i>Smartphone</i> e microcontrolador para enviar comando simples de ligar e desligar um <i>LED</i>. Para facilitar a compreensão da maioria dos leitores, o projeto tem como objetivo a simplicidade e fornecer os conceitos básicos para o desenvolvimento da ideia principal que é comandar equipamentos como luminárias, ventiladores entre outros. </div>
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Circuito microcontrolado</h4>
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O circuito que recebe os comando do <i>Smartphone</i> é constituído basicamente por um microcontrolador <i>PIC 16f876a</i>, Módulo <i>Bluetooth HC-6</i> e um <i>LED</i> para visualização do comando de Liga/Desliga. </div>
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A Figura 1 apresenta o diagrama elétrico do circuito, as ligações são de baixa complexidade e podem ser montadas facilmente em um <i>Protoboard</i>. A Tabela 1 apresenta a lista de componentes utilizados no circuito. </div>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjRd_4IMoV9B_lz5EkdMdg7k-iXG_H-4qEqKIFrvegciCDJqqGfQcTODaVa8f7JnUCDV6U1kYXVT6KZ9UE9fng9egHZNppxvTzS0ajFtTABJgDN_OcAMwOyGWQU1ANMb82MSF3Dix6YfJl8/s1600/circuito.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Como cnectar o Módulo Bluetooth HC-06 com o PIC e Arduino" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjRd_4IMoV9B_lz5EkdMdg7k-iXG_H-4qEqKIFrvegciCDJqqGfQcTODaVa8f7JnUCDV6U1kYXVT6KZ9UE9fng9egHZNppxvTzS0ajFtTABJgDN_OcAMwOyGWQU1ANMb82MSF3Dix6YfJl8/s1600/circuito.png" title="PIC + Módulo Bluetooth HC-06" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 1 - Diagrama elétrico do circuito PIC + Bluetooth.</td></tr>
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Tabela 1 - Lista de Componentes.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEifTMmYfTPBbEjF5PofpUJ_bka66hYqRipJS_5fjXvV7hksev54jCBdmGYXlFzM2_UmBbGB4oTHlw4U_bZ9wCY3_Mv_dZaoY73MVv5lHUEbcVCn6PUhVh23CD7uf4iClgbrWbiZf42WYBUo/s1600/Lista.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img alt="Smartphone e microcontroaldor" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEifTMmYfTPBbEjF5PofpUJ_bka66hYqRipJS_5fjXvV7hksev54jCBdmGYXlFzM2_UmBbGB4oTHlw4U_bZ9wCY3_Mv_dZaoY73MVv5lHUEbcVCn6PUhVh23CD7uf4iClgbrWbiZf42WYBUo/s1600/Lista.png" title="Componentes para Ligação do Módulo Bluetooth HC-06" /></a></div>
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A montagem final do protótipo em <i>Protoboard</i> é ilustrada na Figura 2.</div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEipg9kvodIJtklgGw9EFwEIb9DqAVq_jbHh6lDDa4YE7qwAatnI9INkFuZ2mne4xFOYb9rbIgbv_EVAfZgDeI4fsCzJfQMr02CUBGpXGQ2qQvqOL3OR-m1hx_S8UO7dkf661R5IpUS3wlt8/s1600/2015-10-17+22.34.44.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Microcontrolador PIC e Módulo Bluetooth HC-06" border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEipg9kvodIJtklgGw9EFwEIb9DqAVq_jbHh6lDDa4YE7qwAatnI9INkFuZ2mne4xFOYb9rbIgbv_EVAfZgDeI4fsCzJfQMr02CUBGpXGQ2qQvqOL3OR-m1hx_S8UO7dkf661R5IpUS3wlt8/s400/2015-10-17+22.34.44.jpg" title="PIC + Módulo Bluetooth HC-06" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 2 - Montagem final do circuito PIC+ Módulo Bluetooth em protoboard.</td></tr>
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Módulo <i>Bluetooth HC-06</i></h4>
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O módulo <i>Bluetooth HC-06</i> é do tipo escravo, o que permite somente receber uma conexão de outro dispositivo. A tensão de alimentação o módulo é entre 3,3V a 6V. Os pinos de comunicação serial funcionam com níveis lógicos de 3,3V e com taxa de transmissão configuráveis via software de 1200, 2400, 4800, 9600, 19200 e 38400. A corrente consumida durante operação de trabalho é de 40mA e de 1mA em <i>stand-by</i>.</div>
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<b>Configuração do Módulo <i>Bluetooth HC-06</i></b></div>
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O módulo <i>Bluetooth HC-06</i> vem com uma configuração padrão dado por: Modo escravo, taxa de transmissão de 9600, nome <i>HC-06</i> e Código PIN 1234. Todavia é possível alterar essas configurações de fábrica através de comando de <i>strings</i> (caracteres) enviados via <i>software</i>. A Tabela 2 apresenta os possíveis comandos para o módulo <i>HC-06</i>.</div>
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Tabela 2 - Comando de configuração do Módulo Bluetooth HC-06</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjmN58v8jzb48_BN5ZxTYsO1RPSA0DrUmmkvGDLy9UXZl-6-8tLhxNFNgJ10xOHcgfVW0IICKZCOYKqooZrx088Z33FVncOV04rRr70muuknAIGoUVCyMKKb5t7K3JGTtA5Fr5due3KXufY/s1600/tabela.png" imageanchor="1"><img alt="PIC + Módulo Bluetooth HC-06" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjmN58v8jzb48_BN5ZxTYsO1RPSA0DrUmmkvGDLy9UXZl-6-8tLhxNFNgJ10xOHcgfVW0IICKZCOYKqooZrx088Z33FVncOV04rRr70muuknAIGoUVCyMKKb5t7K3JGTtA5Fr5due3KXufY/s1600/tabela.png" title="Como Configurar o Módulo Bluetooth HC-06" /></a></div>
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Para alterar a taxa de transmissão, devemos mandar a linha de instrução: <b>AT+BAUD#</b> e o módulo retorna uma mensagem de confirmação. Onde "#" pode ser um numero de 1 a 6.</div>
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Enviado: “AT+BAUD#”<br />
Recebido: "OKbaud"</div>
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1: 1200<br />
2: 2400<br />
3: 4800<br />
4: 9600<br />
5: 19200<br />
6: 28400<br />
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<b>Exemplo:</b> Envio: AT+BAUD1<br />
Recebido: OK1200<br />
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A configuração do módulo pode ser feita pelo próprio microcontrolador ou através de uma porta serial do PC.</div>
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<b>Conexão entre o Microcontrolador e o Módulo <i>Bluetooth HC-06</i></b></div>
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Para que a comunicação serial <i>RS232</i> entre o módulo <i>Bluetooth</i> e o microcontrolador funcione corretamente, resistores de 1,5<!--[if gte mso 9]><xml>
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<![endif]--> são necessários para adequar o nível de tensão de 5V para os 3,3V evitando assim a queima do módulo. Esses resistores funcionam como um divisor de tensão, como apresentado na Figura 3.</div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg98opfd5T3J9RuquPRp1uVikOu6WVMMiZ8a4WEvtPXcXmiC2iKXpI5GaHgMfrWJJDkum2GejzVnSyoMXWZWEy0xlx2KcCc4MkiCkcRZXEvaGjHvrW5jmDOjiwBYQ52Utu0abOoWgRne1ZQ/s1600/divisor+de+tens%25C3%25A3o.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Conversor de 5V para 3,3V" border="0" height="179" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg98opfd5T3J9RuquPRp1uVikOu6WVMMiZ8a4WEvtPXcXmiC2iKXpI5GaHgMfrWJJDkum2GejzVnSyoMXWZWEy0xlx2KcCc4MkiCkcRZXEvaGjHvrW5jmDOjiwBYQ52Utu0abOoWgRne1ZQ/s320/divisor+de+tens%25C3%25A3o.png" title="Divisor de tensão " width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 3 - Divisor de tensão para compatibilizar níveis de tensão.</td></tr>
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Programação do Microcontrolador PIC 16f876a</h3>
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A programação do microcontrolador <i>PIC</i> foi feita na linguagem <i>C</i> através do ambiente de programação da <i>CCS</i>. O código é apresentado a seguir. O Código fonte pode ser também baixado no link: <a href="https://www.dropbox.com/s/12mqeqt0c47agah/RADIO.c?dl=0" rel="nofollow" target="_blank">Codigo_fonte</a> <br />
O código fonte possui os devidos comentários para o entendimento do programa.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjX3p95cwk8itjcVa0dtOUnuTeuhijovSG0SQlEfJrhqIhJm3AQF_sDH70LzenNYrQUswOoRf1A_DPu-eBCsWszEDXTdaFMpRPWDrWxMrSFk7p3x8sdQboJ-gEo3O9uYZijMOyQBY81W55N/s1600/prog.bmp" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img alt="Biblioteca do Módulo Bluetooth HC-06 para o PIC" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjX3p95cwk8itjcVa0dtOUnuTeuhijovSG0SQlEfJrhqIhJm3AQF_sDH70LzenNYrQUswOoRf1A_DPu-eBCsWszEDXTdaFMpRPWDrWxMrSFk7p3x8sdQboJ-gEo3O9uYZijMOyQBY81W55N/s1600/prog.bmp" title="Programa para o Módulo Bluetooth HC-06 e PIC no CCS" /></a></div>
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Criando o aplicativo para Android no App Inventor</h3>
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O <i>App Inventor</i> para <i>Android</i> é uma plataforma desenvolvimento <i>online</i> e originalmente fornecida pelo <i>Googl</i>e, mas foi descontinuada em agosto de 2011, sendo mantida pela MIT sob o nome de <i>MIT </i><i><a href="http://appinventor.mit.edu/explore/" target="_blank">App Inventor</a></i>. O ambiente de programação do <i><a href="http://appinventor.mit.edu/explore/" target="_blank">App Inventor</a></i> permite a criação de aplicativos, mesmo que o usuário tenha noções mínimas em programação de computadores. A plataforma possui uma interface gráfica que permite os desenvolvedores a utilizarem a técnica <i>drag</i> and <i>drop</i> (arrastar e soltar) para os elementos gráficos e criar aplicativos para serem utilizados em muitos dispositivos móveis. Para utilizar o <i>MIT </i><i><a href="http://appinventor.mit.edu/explore/" target="_blank">App Inventor</a></i> é necessário ter uma conta <i>Google GMAIL</i>. </div>
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As aplicações são desenvolvidas na aba <i>Designer</i>, onde o usuário escolhe quais os componentes serão utilizados em sua aplicação. Na aba <i>Block Editor</i>, o usuário monta os blocos de programa que especificam como os componentes iram se comportar. Quando o aplicativo estiver concluído o desenvolvedor pode compila-lo na opção <i>Build</i> e instala-lo no <i>Smartphone. </i><br />
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As Figuras 4 e 5 apresenta o diagrama de blocos do programa desenvolvido.<i> </i>A Figura 4 mostra os blocos associados aos eventos de click sobre os botões Liga LED e Desliga LED. Como ilustrado na Figura 4 o botão <i>Liga.click</i> quando acionado, envia a codificação da letra "l" em ASCII por intermédio da chamada da função <i>BluetoothClient1.SendTex</i>t e fazendo como o LED acenda. O Botão <i>Desliga.click</i> possui a mesma funcionalidade porem para apagar o LED.</div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj8v10NeGfWIz1MAHzgdXwPvp8Xyw41VM_NDzfLYQq8e_tFDT23V-4mGGk58SIdFiMGtTyPgQZp5mGgTDQ6pJ5ahokL9h27xsNNL3nC-tnTgHiiR9C28KNv6U-b9xUXg5d6CEhSnTsrQQZ1/s1600/botao.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Como fazer um App para android" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj8v10NeGfWIz1MAHzgdXwPvp8Xyw41VM_NDzfLYQq8e_tFDT23V-4mGGk58SIdFiMGtTyPgQZp5mGgTDQ6pJ5ahokL9h27xsNNL3nC-tnTgHiiR9C28KNv6U-b9xUXg5d6CEhSnTsrQQZ1/s1600/botao.png" title="Fazendo um App para o Módulo Bluetooth HC-06 " /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 4 - Botões Liga e Desliga LED.</td></tr>
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O componente <i>ListPicker2.BeforePicking</i> quando clicado seleciona o evento <i>BluetoothClient1.AdresseAndName</i>s e abre uma caixa de seleção para o usuário escolher qual dispositivo Bluetooth pareado utilizar. Em seguida o evento <i>ListPicker1.AfterPicking</i> conecta o <i>Bluetooth</i> do <i>Smartphone</i> ao <i>Bluetooth</i> do módulo. O botão <i>Desconecta.Click</i> desativa as conexões entre os dois aparelhos, chamando a função <i>BluetoothClient1.Disconnect</i> e provoca o encerramento do aplicativo. <br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj88gBXa7k7cLnFQYPYHXkZUgFbCiXk8CdPtLT7Dan-YChB2jbprwWHydXNZYyyWCGplxnS0lQRXgmHttWi4T-EJfDiOTsxFrOUm_z9j6lQ9-dArQz-b4rxHbU0bd9k_3qEe1ob7uDlJvMK/s1600/bluetooth.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Como fazer um App para android" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj88gBXa7k7cLnFQYPYHXkZUgFbCiXk8CdPtLT7Dan-YChB2jbprwWHydXNZYyyWCGplxnS0lQRXgmHttWi4T-EJfDiOTsxFrOUm_z9j6lQ9-dArQz-b4rxHbU0bd9k_3qEe1ob7uDlJvMK/s1600/bluetooth.png" title="App para Ligar Led com PIC ou Arduido " /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 5 - Função de conexão e desconexão do bluetooth.</td></tr>
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A Figura 6 apresenta a visualização da tela gráfica projetada. O aplicativo para <i>Android</i> desenvolvido pode ser baixado para a instalação no <i>Smartphone</i> pelo Link: <a href="https://www.dropbox.com/s/5o8iq63vfvfwbac/Liga_Led.apk?dl=0" rel="nofollow" target="_blank">App_LIGA_DESLIGA_LED</a><br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjz7VEMVXUh16_UlnzJKmq36TLDE0GojH4QQj1PH3JPbGqH53wzgYcBf8oojOREOFiXAIXy1HMHTU19-ANuFFBMKKgCJpA9HOePpyZVMsHtqUUVGTowD0kPi5TfpCtVFfRKnhO1KcprLfGj/s1600/tela.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Como fazer um App para Android" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjz7VEMVXUh16_UlnzJKmq36TLDE0GojH4QQj1PH3JPbGqH53wzgYcBf8oojOREOFiXAIXy1HMHTU19-ANuFFBMKKgCJpA9HOePpyZVMsHtqUUVGTowD0kPi5TfpCtVFfRKnhO1KcprLfGj/s1600/tela.png" title="Ligando um Led com o Smartphone e PIC/Arduino" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 6 - Tela gráfica projetada.</td></tr>
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Confiram o Vídeo do funcionamento !<br />
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Guilhermehttp://www.blogger.com/profile/01893157551344267377noreply@blogger.com21Unnamed Road, Lagoa Dourada - MG, 36345-000, Brasil-20.9375713 -44.0608248-50.359059491306411 -79.217074799999978 8.4839168913064178 -8.9045748000000273tag:blogger.com,1999:blog-8832769654369184552.post-25831911609118293212015-08-05T15:48:00.001-03:002017-06-29T16:53:48.102-03:00Buzzer com o 4093<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjiZopTZRlPr9iDs9MF1xsL5sbh5Cw3WN6BgD8CEmjnJMtfxazxtx22EmtRmYrTs8u8Uf1AazcO-SHekkWYFx0lsTB5ctnvGNwaGAgp8fFCTzSCAI2aK0WPSHKmjw4IQje2js2tB7cHoCdq/s1600/motagem2.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="212" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjiZopTZRlPr9iDs9MF1xsL5sbh5Cw3WN6BgD8CEmjnJMtfxazxtx22EmtRmYrTs8u8Uf1AazcO-SHekkWYFx0lsTB5ctnvGNwaGAgp8fFCTzSCAI2aK0WPSHKmjw4IQje2js2tB7cHoCdq/s320/motagem2.png" width="320" /></a>Um circuito oscilador <i>RC</i> baseado no CI 4093 pode ser utilizado para excitar um <i>Buzzer</i> ou transdutor piezoelétrico com tom de áudio que dependem da capacitância <i>C<span style="font-size: x-small;">1</span></i> e pode ser ajustado através de uma resistência variável. </div>
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<span style="font-size: large;">Introdução - <i>Buzzer</i> com o 4093</span></h3>
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Neste post é apresentado um circuito simples de um oscilador RC baseado no CI 4093 e utilizado para excitar um <i>Buzzer</i> ou transdutor piezoelétrico. Primeiramente, o circuito completo do <i>Buzzer</i> com o 4093 é ilustrado e o seu funcionamento é descrito. No final, o circuito é montado e testado em <i>protoboard</i> e uma sugestão de placa para montagem em circuito impresso é apresentada. Para uma melhor compreensão do funcionamento do oscilador RC recomenda-se a leitura do post <a href="http://eletronicaemcasa.blogspot.com.br/2015/07/oscilador-rc-com-o-4093.html" target="_blank"><b>"Oscilador RC com 4093</b></a><b>".</b></div>
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Circuito <i>Buzzer</i> com o 4093 e seu funcionamento</h3>
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O funcionamento do circuito <i>Buzzer</i> baseado no 4093, ilustrado na Figura 1 é baseado no oscilador RC. As oscilações do circuito <i>RC</i> produzem uma onda quadrada em <i>V<span style="font-size: x-small;">out</span></i> que vai de <i>0V</i> a <i>V<span style="font-size: x-small;">dd</span></i>. A dinâmica de carga de descarga do capacitor definem a frequência de oscilação do circuito. As oscilações do circuito é proporcionada pelo CI1A 4093 e sua frequência é definida pelo capacitor <i>C<span style="font-size: x-small;">1</span></i> e o resistor <i>R<span style="font-size: x-small;">1</span></i> em série com o <i>trimpot</i> <i>P<span style="font-size: x-small;">1</span></i> . O <i>Buzzer</i> é conectado nos terminais <i>B1</i> e <i>B2</i> e a alimentação do circuito é feita através dos terminais <i>+V</i> e <i>0V</i>.<br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjj4d8yEobUex8NzhOdspoD77C1ioxcNAi0Dd5UjvoLyOeuiuJ6aISyD9222_yHrrxYfVp0AxoS19nMTYnXzQ-IM2EmqWql1p9FHzMABRB9yCXNd6P54LcDdkjNiAIXu5YDKQuX9itQm1s0/s1600/esquema.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Circuito oscilador" border="0" height="292" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjj4d8yEobUex8NzhOdspoD77C1ioxcNAi0Dd5UjvoLyOeuiuJ6aISyD9222_yHrrxYfVp0AxoS19nMTYnXzQ-IM2EmqWql1p9FHzMABRB9yCXNd6P54LcDdkjNiAIXu5YDKQuX9itQm1s0/s640/esquema.png" title="Buzzer com 4093" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 1 - Esquemático do circuito<i> Buzzer</i></td></tr>
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O capacitor <i>C<span style="font-size: x-small;">1</span></i> tende a se carregar através dos resistores <i>R<span style="font-size: x-small;">1</span></i> e <i>P<span style="font-size: x-small;">1</span></i> quando a tensão de saída <i>V<span style="font-size: x-small;">out</span></i> é igual a <i>V<span style="font-size: x-small;">dd</span></i>. A tensão <i>v<span style="font-size: x-small;">(t)</span></i> do capacitor <i>C<span style="font-size: x-small;">1</span></i> no processo de carga tende a aumentar até <i>V<span style="font-size: x-small;">dd</span></i>, entretanto quando <i>v<span style="font-size: x-small;">(t)</span></i> atinge a tensão de referência superior <i>V<span style="font-size: x-small;">t</span>+</i> das entradas<i> Schmitt trigger</i> a saída <i>V<span style="font-size: x-small;">out</span></i> comuta de <i>V<span style="font-size: x-small;">dd</span></i> para <i>0V</i> e o circuito <i>RC</i> (Formador por <i>C<span style="font-size: x-small;">1</span></i>, <i>R<span style="font-size: x-small;">1</span></i> e <i>P<span style="font-size: x-small;">1</span></i>) começa a descarregar. No processo de descarga do circuito <i>RC</i>, a tensão <i>v<span style="font-size: x-small;">(t)</span></i> tende ir para zero, porem quando <i>v<span style="font-size: x-small;">(t)</span></i> atinge o valor da tensão de referência inferior <i>V<span style="font-size: x-small;">t</span>-</i> das entradas <i>Schmitt trigger</i> a saída <i>V<span style="font-size: x-small;">out</span> </i>comuta novamente para <i>V<span style="font-size: x-small;">dd</span></i> e o processo se reinicia de forma periódica. Os estágios seguintes ( IC1B, CI1C e CI1D) realizam o isolamento do estágio oscilador além de criar uma onda quadrada complementar para acionar o <i>Buzzer</i>. </div>
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A frequência de oscilação do circuito é definida pela Equação 5, onde <i>R</i> equivale a resistência total formada por <i>R<span style="font-size: x-small;">1</span></i> mais <i>P<span style="font-size: x-small;">1</span></i> e <i>C</i> é a capacitância <i>C<span style="font-size: x-small;">1</span></i>. Maiores detalhes do funcionamento do oscilador pode ser obtidas no post "<b><a href="http://eletronicaemcasa.blogspot.com.br/2015/07/oscilador-rc-com-o-4093.html" target="_blank">Oscilador RC com o 4093</a></b>". </div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgev2ZuGTLaTSvZyiAT0pWNXHJYnV9kgJaSC58m1l6N-qTidoUhBbz5QOnj3xdkCnhnMAwBlhIhLon4JreJPFTucpT5ti_xQmugrhnopqJHk2dVv7AG5xWsy615ujRhyphenhyphendORJwK83G7gOyW2/s1600/eq_part3.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img alt="Formula do oscilador RC" border="0" height="165" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgev2ZuGTLaTSvZyiAT0pWNXHJYnV9kgJaSC58m1l6N-qTidoUhBbz5QOnj3xdkCnhnMAwBlhIhLon4JreJPFTucpT5ti_xQmugrhnopqJHk2dVv7AG5xWsy615ujRhyphenhyphendORJwK83G7gOyW2/s400/eq_part3.png" title="Frequência de oscilação circuito RC" width="400" /></a></div>
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Montagem do Buzzer com 4093</h3>
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A Figura 2 apresenta a montagem do circuito <i>Buzzer</i> em <i>protoboard</i>. A alimentação (<i>V<span style="font-size: x-small;">dd</span></i>) é feita por uma fonte de <i>5V</i>. </div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjuGds6z6n25i5Nh0EyJigpsgXO7R9Z-jHILt6GItLO96XYe3Vft2tuHE203hCCnvrmeC6_TWOkyLQSWSJUW45YZyoDK-ktVpRpj7tc_6AQXuWPCNzQBTrgOfeZ4GJw1qr0GVMTCbYAzjv_/s1600/montagem.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Oscilador RC" border="0" height="204" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjuGds6z6n25i5Nh0EyJigpsgXO7R9Z-jHILt6GItLO96XYe3Vft2tuHE203hCCnvrmeC6_TWOkyLQSWSJUW45YZyoDK-ktVpRpj7tc_6AQXuWPCNzQBTrgOfeZ4GJw1qr0GVMTCbYAzjv_/s640/montagem.png" title="Circuito Buzzer com 4093" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 2 - Montagem do circuito <i>Buzzer</i> em <i>protoboard</i> </td></tr>
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Os valores dos componentes utilizados são: <i>C<span style="font-size: x-small;">1</span>= 47nF</i>, <i>R<span style="font-size: x-small;">1</span>= 10k</i> <i>Ohms</i> e<i> P<span style="font-size: x-small;">1</span>= 270k Ohms</i>. Para esses valores pode-se determinar as frequências teóricas de oscilação máxima e mínima para o circuito alimentado em 5V. A Tabela 1 agrupa os dados fornecidos pelo <i>datasheet</i> para as tensões do nível superiores e inferior do disparador <i>Schmitt trigger</i>, circuito alimentado por uma tensão <i>V<span style="font-size: x-small;">dd</span></i> de <i>5V</i> a <i>25°C</i> .</div>
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Tabela 1 - Dados fornecido pelo <i>datasheet</i> do CD4093BE.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjxzZAcJ9THhyr5WbPhUdAsra5NsERJi1qK9yNK6A29xmneem89kfec5Y5f-yVxUZWO852AWMwzb2QqER_bj05G7D4H1XGGdzCMEvQd4kgwoU_cFSoY10CLRqaCQCYu2uOMumNQJmmmcfHO/s1600/dados.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img alt="4093" border="0" height="79" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjxzZAcJ9THhyr5WbPhUdAsra5NsERJi1qK9yNK6A29xmneem89kfec5Y5f-yVxUZWO852AWMwzb2QqER_bj05G7D4H1XGGdzCMEvQd4kgwoU_cFSoY10CLRqaCQCYu2uOMumNQJmmmcfHO/s640/dados.png" title="Oscilador RC" width="640" /></a></div>
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Os valores de <i>C<span style="font-size: x-small;">1</span></i>, <i>R<span style="font-size: x-small;">1</span></i> e <i>P<span style="font-size: x-small;">1</span></i> <b>medidos</b> são:<br />
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<li><i>C<span style="font-size: x-small;">1</span></i>=50,4 <i>nF</i></li>
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<li><i>R<span style="font-size: x-small;">1</span></i>= 9,81K <i>Ohms</i></li>
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<li><i>P<span style="font-size: x-small;">1</span></i>= 274,5K <i>Ohms</i></li>
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As frequências máxima e mínima ocorrem quando a resistência de <i>P<span style="font-size: x-small;">1</span></i> é igual a zero e <i>274,5K</i> <i>Ohms</i>, respectivamente. As frequências para os valores típicos de <i>Vt+</i> e <i>Vt-</i> fornecidos na Tabela 1 são de <i>f<span style="font-size: x-small;">max</span>=2,49kHz</i> e <i>f<span style="font-size: x-small;">min</span>=85,9Hz</i>. Entretanto, vale ressaltar que esses valores são estimados devido a grande variação das tensões de <i>Vt+</i> e <i>Vt- </i>e na prática as frequências máxima e mínimas podem ser diferentes dos valores teóricos.</div>
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De fato, as frequências máxima e mínima obtidas na prática são diferentes como podem ser observados nas Figuras 3(a) e 3(b). As frequências mínima e máxima calculada para <i>Vt+=2,72V</i>, <i>Vt-=2,04V</i> e <i>V<span style="font-size: x-small;">dd</span>=5V</i> são: <i>f<span style="font-size: x-small;">min</span>=127,19Hz</i> e <i>f<span style="font-size: x-small;">max</span>=3,69kHz </i>que se aproxima bem dos valores fornecidos pelo osciloscópio. </div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgxq2JYPrK_1FRdMQt4ZuvgjZhLgiLT0NHRNfWzPOHxFZX2u73E6hKXXcCv3MXVyG1rmRBsFMztrSyl1r_JWXqmlrdtu0IabSaR4P7_uQerl_RhEpP6IK1j4VX-EdCpbcQBPLnBls0osqrW/s1600/resultados.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Oscilador RC" border="0" height="250" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgxq2JYPrK_1FRdMQt4ZuvgjZhLgiLT0NHRNfWzPOHxFZX2u73E6hKXXcCv3MXVyG1rmRBsFMztrSyl1r_JWXqmlrdtu0IabSaR4P7_uQerl_RhEpP6IK1j4VX-EdCpbcQBPLnBls0osqrW/s640/resultados.png" title="Buzzer com 4093" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 3 - Resultados experimentais: (a) Frequência máxima de oscilação, (b) Frequência mínima de oscilação. </td></tr>
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Uma sugestão de layout para confecção de uma placa de circuito impresso é mostrada na Figura 4. Os arquivos do projeto da placa pode ser baixados no link a baixo.<br />
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<b>Link:</b> <b><a href="https://www.dropbox.com/s/oshumx3oaao6bmt/Buzzer%20com%204093.rar?dl=0" target="_blank">Projeto Buzzer com 4093</a></b> <br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhQ6tvwkNRvMxo129eEy8luZEXWXhhQ7HTagI1YwE0ZgLezYL_J43yl-yPFNCVhjjENUG2mAOTSb2-3nRm8qY0ZIfeQaIxvjqjfp-aKi3p2keYKjwUPdhy_wJSK_yvUCOOOCogL4UxKSx5g/s1600/layout3.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Buzzer com o 4093" border="0" height="232" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhQ6tvwkNRvMxo129eEy8luZEXWXhhQ7HTagI1YwE0ZgLezYL_J43yl-yPFNCVhjjENUG2mAOTSb2-3nRm8qY0ZIfeQaIxvjqjfp-aKi3p2keYKjwUPdhy_wJSK_yvUCOOOCogL4UxKSx5g/s640/layout3.png" title="Oscilador RC e Buzzer" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 4 - Layout do circuito impresso.</td></tr>
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Lista de Componentes para o Buzzer</h3>
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R1 - 10k Ohms<br />
C1 - 47nF (cerâmico ou poliéster)<br />
P1 - Trimpot 270k Ohms<br />
CI - CD4093BE<br />
Tensão de alimentação +3V a +15V. <br />
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Guilhermehttp://www.blogger.com/profile/01893157551344267377noreply@blogger.com2tag:blogger.com,1999:blog-8832769654369184552.post-30309125546714132712015-07-29T12:00:00.000-03:002015-07-29T19:45:45.879-03:00Oscilador RC com o 4093<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEglOXkxQ7BtfVxdRs8h7OXekH-Nj0VvmwFFShHOztWi2-_dytByLJVIfHQzngBRJKX9eiLv9vB8w5lp7DpnVjj1gUg01GB7ndAoKTv1Uf4YpP4kXQlJpSFvnFMkCKw_KYJSh4xZElzj1yxx/s1600/4093real.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="285" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEglOXkxQ7BtfVxdRs8h7OXekH-Nj0VvmwFFShHOztWi2-_dytByLJVIfHQzngBRJKX9eiLv9vB8w5lp7DpnVjj1gUg01GB7ndAoKTv1Uf4YpP4kXQlJpSFvnFMkCKw_KYJSh4xZElzj1yxx/s320/4093real.png" width="320" /></a></div>
O 4093 é um circuito da família CMOS que possui inúmeras aplicações em eletrônica e apresenta grande versatilidade podendo ser usado numa infinidade de soluções em que se deseja constituir um oscilador, conformador de sinal, buffer digital, disparador ou mesmo em sua função normal NAND.</div>
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Introdução</h2>
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Nesta postagem iremos mostrar o funcionamento do CI 4093 configurado como um oscilador <i>RC</i>. No primeiro momento são apresentadas as deduções das equações para a determinação da frequência de oscilação do circuito RC em conjunto com 4093. Por fim, é obtida a equação simplificada da frequência de oscilação do circuito. </div>
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O CI 4093</h2>
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O circuito integrado 4093 pode conter vários sufixos em função do fabricante. Ele pertence à família CMOS de circuitos lógicos digitais, possui quatro portas NAND. Cada porta NAND possui duas entradas <i>Schmitt Triggers</i> que podem ser usadas de forma independente. A alimentação do circuito pode ser feita com tensões de 3V a 15V. A Figura 1 ilustra a pinagem típica do CI 4093 no invólucro DIP. O termo <i>Schmitt trigger</i> é designado para um circuito lógico usado especialmente para tornar uma forma de onda irregular ou senoidal em uma forma de onda quadrada, livre de ruídos. Basicamente um disparador Schmitt é um circuito comparador incorporado nas entradas das portas lógicas.</div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgPcmrZbSMjvvsClOR8ZAMlAtyQiMRvuYpeWWFX667QAzQElYRsfCAusSSmfbIgJF-FHYWl4AITSeNLQ9v4xpwSl3qhhv0w4nFrfVKzXVtnbusGb0Y8yRz_RgTv_GPcV2jOBl9tRIid6lsu/s1600/4093.gif" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Oscilador com 4093" border="0" height="198" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgPcmrZbSMjvvsClOR8ZAMlAtyQiMRvuYpeWWFX667QAzQElYRsfCAusSSmfbIgJF-FHYWl4AITSeNLQ9v4xpwSl3qhhv0w4nFrfVKzXVtnbusGb0Y8yRz_RgTv_GPcV2jOBl9tRIid6lsu/s320/4093.gif" title="CD 4093" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 1 - Pinagem do CI 4093.</td></tr>
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A Figura 2 ilustra o funcionamento do disparador <i>Schmitt Trigger</i> geral. Os disparadores <i>Schmitt</i> operam com duas tensões de referência, sendo uma inferior <i>Vt-</i> e uma superior <i>Vt+</i>, tipicamente, quando o sinal de entrada atinge <i>Vt+</i> (referência superior) a saída comuta de nível lógico baixo para nível lógico alto, permanecendo neste estado até que o sinal de entrada alcance <i>Vt-</i> (referência inferior). Quando a tensão de entrada se encontra entre os dois limiares, a saída retém o valor anterior até a tensão de entrada se alterar suficientemente para mudar o estado do disparador. A ação dos dois limiares é chamada de histerese.</div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiJvWP5JORILNkdvGNNmJ8xLfjewmn8ug4pnvb1aLJu09wfhVG_h-UsE8KMipNRcuJM-yjyKFwbF5iwF5RNc3PPSozlQ5vi13rz4bM2AYvRnmy5ziSzL9Hj_IBUlHRnLrgT35xAMZTx07Fe/s1600/sinal_funcionamento_editado.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Como funciona Schmitt Trigger" border="0" height="249" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiJvWP5JORILNkdvGNNmJ8xLfjewmn8ug4pnvb1aLJu09wfhVG_h-UsE8KMipNRcuJM-yjyKFwbF5iwF5RNc3PPSozlQ5vi13rz4bM2AYvRnmy5ziSzL9Hj_IBUlHRnLrgT35xAMZTx07Fe/s320/sinal_funcionamento_editado.png" title="Entradas Schmitt Trigger" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 2 - Funcionamento do disparador <i>Schmitt Trigger</i>.</td></tr>
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A Figura 3 ilustra o funcionamento de um circuito com entradas <i>Schmitt Trigger</i> comparado com um circuito normal (Sem entradas <i>Schmitt Trigger</i>). Pode-se perceber graficamente que no momento em que o sinal de entrada com ruído se aproxima do limiar de 0,8V a saída do circuito sem <i>Schmitt Trigger</i> comuta várias vezes em quanto à saída do circuito com <i>Schmitt Trigger</i> possui imunidade ao ruído devido aos dois limiares. A vantagem de um disparador Schmitt sobre um circuito normal (com somente um ponto limiar de entrada, geralmente 0,8V) é uma maior estabilidade (imunidade ao ruído). Em um circuito lógico sem disparador <i>Schmitt triggers</i>, um sinal ruidoso operando próximo ao ponto limiar, poderia fazer com que a saída ficasse comutando rapidamente para níveis altos e baixos de forma aleatória.</div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEib_Gl-xrcaO73OAl9itdTjFpoyX6ybrtPAfZUZzdNRJpN1vuHWF_AyjAQX71BY3LUkt_pkEVDBA8dGUwZpmZGCblJXKrDGUTt_DHjWU8r3_nDHWkoKp7r2OxyVtmeMUdUySWjaKqbZqVAg/s1600/sinal_compara%25C3%25A7%25C3%25A3o_editado.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Como funciona Schmitt trigger e suas vantagens" border="0" height="365" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEib_Gl-xrcaO73OAl9itdTjFpoyX6ybrtPAfZUZzdNRJpN1vuHWF_AyjAQX71BY3LUkt_pkEVDBA8dGUwZpmZGCblJXKrDGUTt_DHjWU8r3_nDHWkoKp7r2OxyVtmeMUdUySWjaKqbZqVAg/s400/sinal_compara%25C3%25A7%25C3%25A3o_editado.png" title="Disparador Schmitt Trigger" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 3 - Comparação entre as saídas de circuitos com e sem <i>Schmitt trigger</i>.</td></tr>
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<h2>
Oscilador RC com o 4093</h2>
O circuito oscilador <i>RC</i> baseado no CI 4093 é apresentado na Figura 4.Uma das quatro portas NAND do 4093 é utilizada para realizar a realimentação do circuito <i>RC</i>. As oscilações do circuito <i>RC</i> produzem uma onda quadrada em <i>V<span style="font-size: x-small;">out</span></i> que vai de <i>0V</i> a <i>V<span style="font-size: x-small;">dd</span></i>. A dinâmica de carga de descarga do capacitor definem a frequência de oscilação do circuito.<br />
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O capacitor <i>C</i> tende a se carregar através do resistor <i>R</i> quando a tensão de saída <i>V<span style="font-size: x-small;">out</span></i> é igual a <i>V<span style="font-size: x-small;">dd</span></i>. A tensão <i>v<span style="font-size: x-small;">(t)</span></i> do capacitor <i>C</i> no processo de carga tende a aumentar até <i>V<span style="font-size: x-small;">dd</span></i>, entretanto quando <i>v<span style="font-size: x-small;">(t)</span></i> atinge a tensão de referência superior <i>V<span style="font-size: x-small;">t</span>+</i> das entradas<i> Schmitt trigger</i> a saída <i>V<span style="font-size: x-small;">out</span></i> comuta de <i>V<span style="font-size: x-small;">dd</span></i> para <i>0V</i> e o circuito <i>RC</i> começa a descarregar. No processo de descarga do circuito <i>RC</i>, a tensão <i>v<span style="font-size: x-small;">(t)</span></i> tende ir para zero, porem quando <i>v<span style="font-size: x-small;">(t)</span></i> atinge o valor da tensão de referência inferior <i>V<span style="font-size: x-small;">t</span>-</i> das entradas <i>Schmitt trigger</i> a saída <i>V<span style="font-size: x-small;">out</span> </i>comuta novamente para <i>V<span style="font-size: x-small;">dd</span></i> e o processo se reinicia de forma periódica. <br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgCA7MNX9O3YpoIxm9ULWA9ftg9kWlGVGepk35DxDQMOPcve-OWTMacp_BGXV_I8AyImspEIJt_ppxQ2rQNFjTtWSCdxXAFhg4ePRVqYUJOKbnECoMKZVEzgwyEdCwnTADL_pIx4JAzP9ox/s1600/oscilador.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Oscilador RC com 4093" border="0" height="180" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgCA7MNX9O3YpoIxm9ULWA9ftg9kWlGVGepk35DxDQMOPcve-OWTMacp_BGXV_I8AyImspEIJt_ppxQ2rQNFjTtWSCdxXAFhg4ePRVqYUJOKbnECoMKZVEzgwyEdCwnTADL_pIx4JAzP9ox/s200/oscilador.png" title="Oscilador RC" width="200" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 4 - Circuito oscilador RC com o 4093.</td></tr>
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Dedução da frequência de oscilação </h3>
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A frequência de oscilação do circuito da Figura 4 é dada pela dinâmica de carga e descarga do circuito <i>RC</i> entre os limites superior e inferior do disparador <i>Schmitt trigger</i>. Para encontrar a frequência de oscilação deve-se analisar o circuito da Figura 4 em dois momentos distintos, sendo o primeiro no intervalo de carga e o segundo no período de descarga do circuito <i>RC</i>. As Figuras 5(a) e 5(b) ilustram o comportamento do circuito para os intervalos de carga e descarga.<br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi-vQESmBHzWHfLmMsjtOD-FQTjbA9aj9t4F9AknD-4EbGr3rOaW9Hee_65XfWGB5X4-sAJAacruftUoKpI8xnPbrpYBkjX7u_grqZHeZNPf94fGH-k8JIc5BVJsbg_tc2lQKReMLgSN4j5/s1600/circuito.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Frequência de oscilação RC com 4093" border="0" height="143" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi-vQESmBHzWHfLmMsjtOD-FQTjbA9aj9t4F9AknD-4EbGr3rOaW9Hee_65XfWGB5X4-sAJAacruftUoKpI8xnPbrpYBkjX7u_grqZHeZNPf94fGH-k8JIc5BVJsbg_tc2lQKReMLgSN4j5/s400/circuito.png" title="Frequência de oscilação circuito RC " width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 5 - Dinâmica do oscilador RC: (a) Carregamento do capacitor C; (b) Descarregamento do capacitor C.</td></tr>
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As deduções matemáticas do tempo de carga e descarga do circuito são apresentadas à seguir. Para facilitar a compreensão definiu-se duas regiões de trabalho do circuito no regime permanente (momento que o circuito se estabiliza após a sua energização). A Figura 6 mostras as duas regiões definidas, sendo que a primeira se caracteriza pelo processo de carga do capacitor <i>C</i> e a segunda pelo o seu processo de descarga.<br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEitGDjiYtY4d65WQY2v9nkbJD7GSVlnUxvP8v6l-hRUtUx63xanGRewC0-AHaGkHMnAPZdOvVfVChoqGIZOGd4C2QYzFf7L56nG0EzCCnIQJ-TRMcBw91uCOqszyPd_1ZaFysLc_dj261Cn/s1600/forma_de_onda.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="oscilador RC" border="0" height="269" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEitGDjiYtY4d65WQY2v9nkbJD7GSVlnUxvP8v6l-hRUtUx63xanGRewC0-AHaGkHMnAPZdOvVfVChoqGIZOGd4C2QYzFf7L56nG0EzCCnIQJ-TRMcBw91uCOqszyPd_1ZaFysLc_dj261Cn/s400/forma_de_onda.png" title="Formas de ondas circuito RC com 4093" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 6 - Dinâmica da oscilação do circuito RC com o 4093. Região I define o processo de carga e a Região II define o processo de descarga.</td></tr>
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A Tabela 1 apresenta as deduções matemáticas para as dinâmicas relacionadas ao circuito <i>RC</i>. As equações (1.6) e (2.6) definem a dinâmica da tensão sobre o capacitor <i>C</i> em cada intervalo de carga e descarga do circuito <i>RC</i>.<br />
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<i>v<span style="font-size: x-small;">(t)</span></i> - tensão sobre o capacitor.<br />
<i>t<span style="font-size: x-small;">1</span></i> - variável tempo da Região I.<br />
<i>T<span style="font-size: x-small;">1 </span></i>- Instante de tempo que o circuito começa a se descarregar.<br />
<i>t<span style="font-size: x-small;">2</span></i> - variável tempo da Região II.<br />
<i>T<span style="font-size: x-small;">2 </span></i>- Instante de tempo que o circuito começa a se carregar.<br />
<i>V<span style="font-size: x-small;">dd</span></i> - Tensão de alimentação do 4093.<br />
<i>V<span style="font-size: x-small;">t</span>+</i> - Limite superior de tensão do disparador <i>Schmitt trigger.</i><br />
<i>V<span style="font-size: x-small;">t</span>-</i> - Limite inferior de tensão do disparador <i>Schmitt trigger. </i><br />
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Tabela 1 - Deduções das dinâmicas dos processos de carga e descarga do oscilador RC <a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgptnkP6RaY2dpl0tH4noxYA-fbC2XRpW4L6UWEejsAus93szU7ZTEee1wqALYhBogpWFJ4homylf3IqHRGaaS0KuYmOFyKVNq7PBjfZGhKQbXRDoNdcSmSX8-o6uCPRYF2-EEE4ujiKj2D/s1600/eq_part1.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img alt="Equação da frequência de circuito RC" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgptnkP6RaY2dpl0tH4noxYA-fbC2XRpW4L6UWEejsAus93szU7ZTEee1wqALYhBogpWFJ4homylf3IqHRGaaS0KuYmOFyKVNq7PBjfZGhKQbXRDoNdcSmSX8-o6uCPRYF2-EEE4ujiKj2D/s1600/eq_part1.png" title="Dedução da frequência de oscilação do circuito RC com o 4093" /></a></div>
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Para encontrar o tempo total gasto pelo o circuito para se carregar e descarregar, basta fazer <i>t<span style="font-size: x-small;">1</span>=T<span style="font-size: x-small;">1</span></i> e <i>t<span style="font-size: x-small;">2</span>=T<span style="font-size: x-small;">2</span></i> nas Equações (1.6) e (2.6), respectivamente. A Tabela 2 apresenta o procedimento para definir o tempo gasto para completar cada ciclo de carga e descarga. As Equações (1.8) e (2.8) definem a fórmula geral para encontrar <i>T<span style="font-size: x-small;">1</span></i> e <i>T<span style="font-size: x-small;">2</span></i>.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgLkVaOJulLnRB7aZcawEPB6dNO6tc1zI9JnZeuzpvpgHCLXhalWHQTXoBsMR0o08LgtIl5SRj13usIuyO5__gLaLhn64usmhwcoWWHtaPrtwnjpSd8OJxCy9iwTq32pr5liQ8jJIsTXCOg/s1600/eq_part2.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img alt="4093 e oscilador RC" border="0" height="246" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgLkVaOJulLnRB7aZcawEPB6dNO6tc1zI9JnZeuzpvpgHCLXhalWHQTXoBsMR0o08LgtIl5SRj13usIuyO5__gLaLhn64usmhwcoWWHtaPrtwnjpSd8OJxCy9iwTq32pr5liQ8jJIsTXCOg/s640/eq_part2.png" title="Periodo de carga e descarga circuito RC" width="640" /></a></div>
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Portanto, o período total da oscilação do circuito <i>RC</i> é a soma dos tempos de carga (<i>T<span style="font-size: x-small;">1</span></i>) e descarga (<i>T<span style="font-size: x-small;">2</span></i>), Equação (4). Assim, a frequência de oscilação do circuito é definida pelo o inversor do período, Equação (5). As equações finais encontradas estão em acordo com as informações fornecidas pelos os <i>datasheets </i>dos principais fabricantes. <br />
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Tabela 3 - Frequência de oscilação do circuito RC com o 4093.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhO4s8QkUQ3zI2Mb8ByS44PaeguvMAkLTj9Rz-xgn0svz6JeE4qZsc4MoADqKO045ttDdhDyzgqJsyolPfdQRLmYCj-v4EH5KL9LCxMU7cRWRWML0mvqA6EkMrxswbPcvAhew4y2CZD1tn/s1600/eq_part3.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img alt="Fórmula frequência RC" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhO4s8QkUQ3zI2Mb8ByS44PaeguvMAkLTj9Rz-xgn0svz6JeE4qZsc4MoADqKO045ttDdhDyzgqJsyolPfdQRLmYCj-v4EH5KL9LCxMU7cRWRWML0mvqA6EkMrxswbPcvAhew4y2CZD1tn/s1600/eq_part3.png" title="Frequência de oscilação circuito RC" /></a></div>
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Vale ressaltar que a frequência de oscilação do circuito pode mudar mesmo se o resistor <i>R</i> e o capacitor <i>C</i> for mantido constante. Essa alteração ocorre em função da tensão <i>V<span style="font-size: x-small;">dd</span></i> de alimentação, pois para cada nível de tensão <i>V<span style="font-size: x-small;">dd</span></i> os limites superior e inferior do disparador <i>Schmitt trigger</i> se altera, além da tensão de saída <i>V<span style="font-size: x-small;">out</span>=V<span style="font-size: x-small;">dd</span></i>.<br />
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Frequência de oscilação</h3>
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O <a href="https://www.google.com.br/url?sa=t&rct=j&q=&esrc=s&source=web&cd=5&cad=rja&uact=8&ved=0CCsQFjAEahUKEwi10r-Ihv_GAhWS4IAKHZWqCoM&url=http%3A%2F%2Fwww.ti.com%2Flit%2Fds%2Fsymlink%2Fcd4093bc.pdf&ei=XRm4VfWvMpLBgwSV1aqYCA&usg=AFQjCNFkPcRok7xyeKq9smu9DAAZVVN6AQ&sig2=tMl-RxPr9Td4abzd3SpN9Q&bvm=bv.98717601,d.eXY" target="_blank">datasheet do 4093</a> fornece as informações das tensões <i>V<span style="font-size: x-small;">t</span>-</i> e <i>V<span style="font-size: x-small;">t</span>+</i> para três diferentes níveis <i>V<span style="font-size: x-small;">dd</span></i> de alimentação, são elas <i>5V</i>, <i>10V</i> e <i>15V</i>. A temperatura também é um parâmetro importante e influencia na frequência de oscilação. Para uma temperatura de <i>25°C</i> o fabricante fornece os valores típicos das tensões de referência <i>V<span style="font-size: x-small;">t</span>-</i> e <i>V<span style="font-size: x-small;">t</span>+</i> para diferentes <i>V<span style="font-size: x-small;">dd</span></i>. Assim podemos obter a equação da frequência de oscilação de forma simplificada na Tabela 4 para os três diferentes valores de <i>V<span style="font-size: x-small;">dd</span></i>. <br />
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Tabela 4 - Formulas para a frequência de oscilação para diferentes <i>V<span style="font-size: x-small;">dd</span></i>.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj34B1cjKgGWGHc9ZDNVhUudlgrc1ZoOVZjiWYNnIdR4GiEq8Ur5M85LeyUTGx6tL1cFXvqVFm-l_d8RWgKLoUJWqvQEO7Np9gfCvfHLgLCsf7CmaOyfhDdlrA2woRuhd2PxPqRwV6RYhhd/s1600/formulas.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img alt="Frequência de oscilação do 4093" border="0" height="177" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj34B1cjKgGWGHc9ZDNVhUudlgrc1ZoOVZjiWYNnIdR4GiEq8Ur5M85LeyUTGx6tL1cFXvqVFm-l_d8RWgKLoUJWqvQEO7Np9gfCvfHLgLCsf7CmaOyfhDdlrA2woRuhd2PxPqRwV6RYhhd/s640/formulas.png" title="Calculo da frequência de oscilação" width="640" /></a></div>
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Conclusão </h2>
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As principais características do 4093 foram brevemente apresentadas assim como o princípio de funcionamento de suas entradas <i>Schmitt trigger</i>. O circuito oscilador <i>RC</i> com o 4093 foi descrito e a equação da frequência de oscilação foi deduzida. A frequência de oscilação do circuito é alterada em função dos parâmetros <i>R</i> e <i>C</i>, mas também em função da tensão de alimentação e temperatura de operação do circuito.</div>
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Guilhermehttp://www.blogger.com/profile/01893157551344267377noreply@blogger.com0tag:blogger.com,1999:blog-8832769654369184552.post-48148756313847486112014-05-19T18:11:00.000-03:002014-06-05T15:30:27.324-03:00Modelagem do Conversor Cúk<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhvblaCT4CYI-yfYjH23ma5R_bALcSXD3cnhmkQrbbe6jR0H8tnkB-5NlhVBbmoRpPLrZYa7aVBjiv1MmX08Vfs5xGigs1ueBoGmmcJUuI_nt10SwL8qYN4NkYi3Hp9FZPECNTmzpmxFBYj/s1600/4680_HYPEX-SMPS400-67_THUMB.gif" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhvblaCT4CYI-yfYjH23ma5R_bALcSXD3cnhmkQrbbe6jR0H8tnkB-5NlhVBbmoRpPLrZYa7aVBjiv1MmX08Vfs5xGigs1ueBoGmmcJUuI_nt10SwL8qYN4NkYi3Hp9FZPECNTmzpmxFBYj/s1600/4680_HYPEX-SMPS400-67_THUMB.gif" height="320" width="320" /></a>Este trabalho se propõe em realizar a obtenção dos modelos <b>Chaveado</b>, <b>Médio Não Linear</b> e <b>Médio Linearizado</b> do conversor CC-CC de topologia Cúk. Inicialmente são apresentadas as características gerais do conversor e seu circuito típico. Em seguida, as equações diferenciais que descrevem o circuito do conversor são obtidas para obter os modelos matemáticos do Cúk assim como a sua relação de transformação no modo de condução contínua. Por final realizou-se em Matlab/Simulink as simulações do conversor Cúk com os modelos desenvolvidos para uma variação degrau da relação cíclica e da tensão de entrada. A obtenção dos modelos considera somente o modo de condução contínua do conversor.</div>
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Características Gerais do Conversor <i>Cúk</i>.</h3>
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Conversores CC-CC se baseiam no princípio de transferência de energia entre a entrada e saída através de um elemento reativo. O conversor com topologia Cúk utiliza-se de um capacitor para realizar a transferência de energia entre a fonte e carga [1]. Este conversor é dual do conversor redutor elevador tipo Buck-Boost e está esquematizado na Figura 1. As trocas de energia entre a entrada e a saída são feitas através do condensador C1 e a tensão de saída tem a polaridade invertida em relação à fonte tensão Vg. A grande vantagem deste conversor consiste no reduzido tremor das correntes de entrada e de saída. A redução das ondulações de corrente pode ser ainda maior, caso as indutâncias forem mutuamente acopladas [1].<br />
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O conversor de Cúk tem a vantagem de produzir um baixo ruído EMI por possuir baixo valor de ondulação nas correntes de entrada e saída. A desvantagem deste conversor está na utilização de um capacitor para a transferência de energia entre a entrada e a saída [1]. O processo de transferência de energia só é eficaz para potências não muito elevadas, pois caso contrário é necessário aumentar a capacitância C1 provocando uma redução do rendimento devido aumento das perdas no capacitor.</div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgvwgEj4f_RwveX-1WmfTPlzHaQReLnzHr6Jnx48Zr30VxviyFMPSXfl0bNcpyMGu9gQm2CkRVRzhNbMEGFyDKqi0Zd7kA-gADWpTC-W3mjMu9YhUMqjq7aznkxZIGadwVzHPfe4XJuX1uK/s1600/circuito_completo.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Modelo do Conversor Cuk" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgvwgEj4f_RwveX-1WmfTPlzHaQReLnzHr6Jnx48Zr30VxviyFMPSXfl0bNcpyMGu9gQm2CkRVRzhNbMEGFyDKqi0Zd7kA-gADWpTC-W3mjMu9YhUMqjq7aznkxZIGadwVzHPfe4XJuX1uK/s1600/circuito_completo.png" height="194" title="Conversor Cuk" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 1 - Conversor CC tipo <i>Cúk</i>.</td></tr>
</tbody></table>
<div style="text-align: justify;">
<br />
O conversor Cúk apresentado na Figura 1 funciona em duas situações
distintas que são definidas pelo estado da chave semicondutora presente
no circuito. O Cúk pode funcionar no modo de condução descontinuo que se
caracteriza pela completa descarga do capacitor , no modo continuo a
tensão no capacitor não se anula [2]. Em funcionamento em modo contínuo,
o ganho de tensão depende apenas da relação cíclica, mas no
funcionamento em modo descontínuo, o ganho depende da frequência de
comutação e da resistência de carga. Os parâmetros do conversor são
organizados na Tabela 1.<br />
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<br /></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi0yCCtw4Ww92PpGrimJDIF99TXgYnjrb66O0UthaKrYvhWX2h7mlE6bTpOh7q5XJ3pjrhTFgocluHg905-b_yfsumE1gm-WxefAzpJ9aTSK4pc3ShrR4q-BIt_kWEPq6Y3cPdn6AtUVBBh/s1600/tabela+1.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi0yCCtw4Ww92PpGrimJDIF99TXgYnjrb66O0UthaKrYvhWX2h7mlE6bTpOh7q5XJ3pjrhTFgocluHg905-b_yfsumE1gm-WxefAzpJ9aTSK4pc3ShrR4q-BIt_kWEPq6Y3cPdn6AtUVBBh/s1600/tabela+1.png" height="76" width="640" /></a></div>
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<br />
<h3>
Funcionamento e Modelos do Conversor Cúk.</h3>
</div>
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<div style="text-align: justify;">
O circuito tem duas situações distintas definidas pelo estado da chave semicondutora. Assumindo que o converso opere no modo de condução contínuo, podem-se considerar os dois circuitos apresentados nas Figura 2 e Figura 3 para a chave fechada e aberta respectivamente. <br />
Quando a chave do circuito está fechada a fonte Vg armazena energia na indutância L1 e o capacitor C1 com tensão V1 transfere sua energia através da indutância L2 para suprir a carga, neste instante o diodo D1 não conduz, pois ele se encontra reversamente polarizado pela tensão V1 do capacitor C1. <br />
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<div style="text-align: center;">
<img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjwTJCHDW138gaHQwCA18B-uUNm32G4w79ijrh8iqKHV43QOy01nrSh4ti1T9oxfozSEdCZsxua8EvaHFEHCjqwaYjPKH8bAnF1vcMddjgx0x6ZCpEqyiPGxQwZCA-BU85Nz1nSmI9rhyphenhyphenuZ/s1600/circuito+chave+aberta.png" /></div>
<div style="text-align: center;">
Figura 2 - Circuito <i>Cúk</i> com Chave Fechada</div>
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<br />
No momento que a chave é aberta o diodo D1 se polariza diretamente e passa a conduzir a corrente IL1 que carrega o capacitor com uma tensão superior a da fonte de entrada. A carga passa a ser suprida pela energia armazenada na indutância L2.<br />
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<div style="text-align: center;">
<img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjBgQEYWql9C6MCmhvfvyi2mCUGL4_ApCdJyb5aRRvduS-7J96PIXyO9z4h0xt1FFn3mEoyFGSTPf2c_zwLQD9gQn5FSaUkCCu0m9rjG5dNN16mKrmjEu4HyqhyOTRvEbus_qYEBxe65SpH/s1600/circuito+chave+fechada.png" /></div>
<div style="text-align: center;">
Figura 3 - Circuito <i>Cúk</i> com Chave Aberta.</div>
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<h3>
Equações Diferenciais do Conversor <i>Cúk</i>.</h3>
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<div style="text-align: justify;">
Considerando o funcionamento do circuito podem-se deduzir quatro equações para cada estado da chave semicondutora. As equações e as matrizes de espaço de estados, presente na Tabela 2, são referentes a chave fechada e aberta do circuito das Figura 2 e 3, respectivamente. </div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi7eXaKt1_0Rrto3EIQ0IP-sexBmn_9Xqs58pHAWQYOsFvrT-wWoqXaJuTem4N2oZk2S66x8-FY1tY8GP_URAWHa2-ALUnLmM-J_8j37t4Fho5kzw8odPy2IUE6DAO0O71D03CzuKWSbj4n/s1600/Tabela2.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi7eXaKt1_0Rrto3EIQ0IP-sexBmn_9Xqs58pHAWQYOsFvrT-wWoqXaJuTem4N2oZk2S66x8-FY1tY8GP_URAWHa2-ALUnLmM-J_8j37t4Fho5kzw8odPy2IUE6DAO0O71D03CzuKWSbj4n/s1600/Tabela2.png" height="640" width="511" /></a></div>
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<h3>
Modelo Chaveado do Conversor <span class="st"><i>Cúk.</i></span></h3>
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O modelo chaveado do conversor é obtido intercalando os dois sistemas de equações através da <br />
função d(t), como mostrado em (1). Ou de forma mais compacta, pode-se definir (3).<br />
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<h3>
Modelo médio não Linear do Conversor <span class="st"><i>Cúk</i></span>.</h3>
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As equações do sistema em sua forma bilinear é apresentado em (5). O valor médio dessa equação, que não é linear, define o modelo médio não linear do sistema. Portando, para uma dada entrada de sinal médio têm-se as saída médias do sistema.<br />
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<h3>
Modelo médio Linearizado</h3>
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Pode-se observa pelas equações (3) que o conversor não é linear. A presença dos produtos entre termos dependente do tempo fornecem um sistema não linear. Um modelo linear para pequenos sinais se torna desejável em projetos de controladores clássicos. A equação (3) admite uma linearização entorno de um ponto médio de operação onde as variações em torno desse ponto são pequenas.<br />
<br />
Para um determinado ponto de funcionamento do <i>Cúk</i> pode-se aproximar os estados do sistema <br />
da forma [x(t)]=[X]+[x ̃(t)] como definido em (6).<br />
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Aplicando a aproximação definida em (6), obtém-se a equação matricial (7).<br />
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Com algumas manipulações algébricas é possível redefinir a equação (7) na forma de (8). Com essa nova equação observam-se duas componentes lineares, sendo uma CC e outra AC de 1° ordem e uma terceira componente AC não linear. Onde <b>A</b> e <b>B</b> são as matrizes ponderadas definidas em (9).<br />
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A componente de segunda ordem é desconsiderada no modelo linearizado, pois sua influência para pequenos sinais se torna pequena sendo aproximada como um ruído do modelo. Assim o modelo linearizado do conversor é definido pela equação (10).</div>
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<h3 style="text-align: left;">
Relação de Transformação do Conversor Cúk</h3>
<div style="text-align: left;">
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<div style="text-align: justify;">
A relação de transformação do conversor é obtida para o modo de condução contínua. Em regime permanente as oscilações em torno do ponto médio são pequenas podendo ser desconsideradas (11), assim os estados do sistema podem ser definidos pelas componentes contínua do modelo. Portanto para uma dada relação cíclica e tensão de entrada obtemos (12).</div>
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Resolvendo (12) para Vo encontra-se a relação de transformação do conversor <i>Cúk</i> com perdas. Na Tabela 3 compra a relação de transformação para um caso ideal e com perdas nas indutâncias.</div>
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A Figura 4 apresenta o ganho da tensão de saída em função da relação cíclica para o conversor <i>Cúk</i> estudado considerando um caso com perdas e sem perdas. O ganho máximo do conversor com os parâmetros especificados da Tabela 1 é de <i>−1,98</i> para uma relação cíclica <i>D=0,82</i> .<br />
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjD8sLZQgHfRzSeJzjqmTTFJ4bU5yVASofu70aVbzZL93y6ShBIDoVELgBYZewwn-4bqDiEi9PGyNqUp-dXSnx7IlOpJ8DWtqwVHe06U18ERYMRRZgN8MBbS-GBUJmBeET2-_F_C0dHgLcJ/s1600/ganho.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Relação de transformação do conversor Cuk" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjD8sLZQgHfRzSeJzjqmTTFJ4bU5yVASofu70aVbzZL93y6ShBIDoVELgBYZewwn-4bqDiEi9PGyNqUp-dXSnx7IlOpJ8DWtqwVHe06U18ERYMRRZgN8MBbS-GBUJmBeET2-_F_C0dHgLcJ/s1600/ganho.png" height="476" title="Conversor Cuk" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 4 - Ganho de tensão do conversor <span class="st"><i>Cúk</i></span> ideal e com perdas.</td></tr>
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<h3>
Resultados Simulados dos Modelos do Conversor <span class="st"><i>Cúk.</i></span> </h3>
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<div style="text-align: justify;">
Foi desenvolvido em <i>Matlab/Simulink</i> a simulação do conversor <i>Cúk</i> para os modelos chaveados, médio não linear e médio linearizado. As respostas apresentadas das variáveis de estados para os três modelos correspondem, num primeiro momento ao funcionamento em regime permanente (Figuras 6 e 7), em seguida para uma variação da razão cíclica de chaveamento (Figuras de 8 à 11) e por final são apresentadas as variáveis de estados do conversor em função a uma perturbação da tensão de entrada (Figuras 12 à 15). Os modelos simulados são ilustrados de forma esquemática na Figura 5.</div>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjuwCDOy9XWvbMgff-pd9rVNb1GjIRYziTlKCaKcc6MIru5wjKalyq6nz5ESO0OeiDCsnc7gsa_JgM-jRpg0oWNIF7SqqeaCqe-dLBukX69A883d8FRg0BPpwXF6c4_ByWHreLbctjdtGmM/s1600/sistema.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Modelos do conversor CC/CC Cuk " border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjuwCDOy9XWvbMgff-pd9rVNb1GjIRYziTlKCaKcc6MIru5wjKalyq6nz5ESO0OeiDCsnc7gsa_JgM-jRpg0oWNIF7SqqeaCqe-dLBukX69A883d8FRg0BPpwXF6c4_ByWHreLbctjdtGmM/s1600/sistema.png" height="481" title="Simulação Conversor Cuk" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 5 - Esquemático da Simulação dos modelos desenvolvidos.</td></tr>
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<div style="text-align: justify;">
Inicialmente considerou-se a tensão de entrada constante em <i>Vg=10V</i> para os três modelos e uma razão cíclica de <i>D=0,3501</i> com o objetivo de se obter uma tensão de saída de <i>5V</i>. As Figura 6 e Figura 7 apresentam os estados do conversor nos três modelos. O modelo Chaveado é representado em vermelho e os modelos Médio não Linear e Médio Linearizado são expostos na cor verde e azul respectivamente. Vale notar que o modelo chaveado possui ondulações em seus estados, pois o modelo considera os efeitos de chaveamento do circuito, já os outros dois modelos esse efeito não é considerado pois suas entradas estão em função dos seus valores médios. </div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj4YTmSHD8WyYZUevBmFZvZR5aip8OKh2zhz8UAU-lhpb-6MXyPt36h5uvliEP8AzdW_ju07TMwgjKDH9CU7wSFQVO8uCIoJYUeOp1ZoL_Hz7glPG5bX9F6x2HGUpODCWUGD66lvwwhSps0/s1600/Tensoes+V1+e+Vo.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Varaiveis de estado do conversor cuk" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj4YTmSHD8WyYZUevBmFZvZR5aip8OKh2zhz8UAU-lhpb-6MXyPt36h5uvliEP8AzdW_ju07TMwgjKDH9CU7wSFQVO8uCIoJYUeOp1ZoL_Hz7glPG5bX9F6x2HGUpODCWUGD66lvwwhSps0/s1600/Tensoes+V1+e+Vo.png" height="394" title="Regime permanente do conversor Cuk" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 6 - Tensão de saída Vo e Tensão sobre o capacitor C1 Vc1. </td></tr>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqDbas0u_Oju_9IdvtSNsyAB_Wvq0DNkkvBWrgaPbos-Q0RY65rRj2I6gBSmba_JY4I8XN_CeGSNIjxhs5nAsh3u5FIkTZ3clOMpMF8sHLmYz2FBLlE2ubW0h8qLd2CJUcTlYHKXbOtfeZ/s1600/Correntes.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqDbas0u_Oju_9IdvtSNsyAB_Wvq0DNkkvBWrgaPbos-Q0RY65rRj2I6gBSmba_JY4I8XN_CeGSNIjxhs5nAsh3u5FIkTZ3clOMpMF8sHLmYz2FBLlE2ubW0h8qLd2CJUcTlYHKXbOtfeZ/s1600/Correntes.png" height="396" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 7 - Corrente de entrada <span style="font-size: small;">(<b>I<span style="font-size: xx-small;">L1</span></b>)</span> e corrente sobre o Indutor L2 <span style="font-size: small;">(<b>I</b></span><span style="font-size: xx-small;"><b>L2</b><span style="font-size: small;">)</span></span></td></tr>
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Em seguida variou-se a relação cíclica do conversor de <i>D=0,3501</i> para <i>D=0,4501</i> em <i>t=6ms</i>. As <br />
Figura 8, Figura 9, Figura 10 e Figura 11 apresentam o comportamento dos quatros estados do<br />
sistema Cúk para os modelos <b>Chaveados</b>, <b>Médio Não Linear</b> e <b>Médio Linearizado</b> respectivamente.</div>
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Na situação de variação da relação cíclica o modelo médio linearizado apresenta um erro considerável em amplitude, pois a linearização não contempla outros pontos de funcionamento do sistema o que limita o modelo para pequenas variações próximas do ponto quiescente projetado.</div>
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Em um segundo momento manteve-se a relação cíclica do conversor constante em <i>D=0,3501</i> e variou-se, em forma de degrau, a tensão de entrada (<i>Vg</i>) do conversor de <i>10V</i> para <i>12V</i>. Nas Figura 12, Figura 13, Figura 14 e Figura 15 apresentam o comportamento dos quatros estados do conversor <i>Cúk</i> para os modelos <b>Chaveado</b>, <b>Médio Não Linear</b> e <b>Médio Linearizado</b> respectivamente.</div>
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É possível observar pelos gráficos das figuras acima que o modelo médio linearizado e médio não linear possuem o mesmo comportamento e correspondem ao valor médio do modelo chaveado. De fato esse comportamento do modelo linearizado é previsto pela equação (8), pois a componente CA da relação cíclica é zero quando <i>d(t)</i> é constante, logo a equação (8) nessa situação é equivalente a equação (5) do modelo médio não linear.</div>
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<h3>
Conclusão</h3>
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Os modelos desenvolvidos tendem a representar o sistema real através de simplificações e considerações de funcionamento. O modelo chaveado se aproxima de forma mais completa da operação do conversor, pois o processo de chaveamento é considerado no modelo, entretanto a modelagem chaveada não considerou todos os elementos parasitas do circuito como perdas nos dispositivos semicondutores e capacitores. O modelo não linear descreve o comportamento do conversor sem a influência do chaveamento e é útil para obter o valor médio das trajetórias dos estados do sistema. O modelo linearizado representa o sistema para um determinado ponto de operação sendo limitado para outras condições de trabalho porem essa técnica de modelagem por linearização se torna útil para o projeto de controladores clássicos (PI e PID).</div>
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Referências</h3>
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1. MANUEL , J. D. C. Apontamentos de Eletrónica de Potência II. [S.l.]. 2000.<br />
2. ERIKSON, R. W. Fundaments of Power Electronics. [S.l.]: Ed. Chapman & Hall, 1997.</div>
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3. SELEME I. S. Modelagem e Controle de Conversores Estáticos. </div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgidvhE-mTPhGAq7kWA6IKD6aDdIr7e23YXT8NTyB9UELFZH1BW9v-H6js_UkuNjhOLDC-Gn5DyguiOzL6ya-5CggAwkWZbfiwa3fqHHSR0KzB2jve0JAWutNpU4fVxob8PchVk6cYOKJvn/s1600/capa.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgidvhE-mTPhGAq7kWA6IKD6aDdIr7e23YXT8NTyB9UELFZH1BW9v-H6js_UkuNjhOLDC-Gn5DyguiOzL6ya-5CggAwkWZbfiwa3fqHHSR0KzB2jve0JAWutNpU4fVxob8PchVk6cYOKJvn/s1600/capa.png" height="231" width="320" /></a><span style="font-family: inherit;">Os semicondutores são largamente utilizados em diversas aplicações comerciais e indústrias. O processo industrial exige elevada potência, por isso os dispositivos semicondutores devem ser cuidadosamente escolhidos para cada aplicação e condição de funcionamento. Este trabalho consiste em uma análise comparativa entre dois diodos retificadores trifásicos de potência, destacando as características de condução e chaveamento em função dos aspectos físicos dos dispositivos. Os componentes utilizados nas análises presentes neste trabalho são os módulos SK80D 12F e SK95D12 fabricados pela SEMIKRON®.</span></div>
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1<span style="font-family: inherit;">) Dispositivos Semicondutores Analisados: SK80D12F e SK95D </span></h3>
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<span style="font-family: inherit;"> </span></h3>
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<span style="font-family: inherit;">Os módulos SK80D12F e SK95D são retificadores trifásicos de potência. O retificador SK80D12F é do tipo comutação rápida e recombinação suave, possui um design compacto necessitando de somente um parafuso de fixação, a transferência de calor e o isolamento do dispositivo é feita através de cobre ligado a uma cerâmica de óxido de alumínio. Suas principais aplicações abrangem a chaveamentos de potência em geral, UPS e SMPS [1]. </span></div>
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<span style="font-family: inherit;">O módulo SK95D12 tem a capacidade de bloquear até 1200V de tensão reversa e conduzir elevadas correntes além de possui design compacto, a transferência de calor e o isolamento do dispositivo é feita através de cobre ligado a uma cerâmica de óxido de alumínio. O SK95D12 possui também a tecnologia <i>Glass Passived</i> que ajuda a estabilizar a região de depleção controlando a corrente reversa e minimizando seu impacto na junção semicondutora [2]. Suas aplicações típicas são em entrada de retificadores em fontes de potência e retificação em geral [3]. </span></div>
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<span style="font-family: inherit;">Os dois dispositivos podem bloquear até 1200V de tensão reversa e suportam elevadas correntes de condução. Por essas características de operação e pelas atuais tecnologias comercialmente disponíveis pode-se inferir que os módulos são construídos com diodos PIN. Os módulos SK95D12 e SKD12F da SEMIKRON são apresentados abaixo. </span><br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEieZAJVASW08QccSBpQo9kYDRzIscsycv9CL7BFSeElBMWZrJs9D-CuHOdaJY44AkWo6ce0DbHXoJ4nF5TVpuhUEsE3qcNb9QhVigQdstVGFPQxMtLNhavF1DU0HbjMCIY_auapvYCTru64/s1600/ponte.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEieZAJVASW08QccSBpQo9kYDRzIscsycv9CL7BFSeElBMWZrJs9D-CuHOdaJY44AkWo6ce0DbHXoJ4nF5TVpuhUEsE3qcNb9QhVigQdstVGFPQxMtLNhavF1DU0HbjMCIY_auapvYCTru64/s1600/ponte.png" height="200" width="158" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Ponte retificado Trifásico dos Módulos SK951D2 e SK80D12 </td></tr>
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<span style="font-family: inherit;">2) Característica do Diodo PIN. </span></h3>
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<span style="font-family: inherit;"> </span></h3>
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<span style="font-family: inherit;">2.1) Topologia punch-through PT</span></h4>
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<span style="font-family: inherit;">A estrutura do diodo PIN na topologia punch-through para aplicações em alta potência é mostrada na Figura 1. O dispositivo é constituído basicamente por três camadas. A primeira camada é do tipo-N fortemente dopado, representada por (<i>N+</i>), a segunda é do tipo <i>N</i> fracamente dopada, denominada por (N-). A terceira é uma camada tipo P fortemente dopada (<i>P+</i>). A camada tipo pode ser considerada como uma camada intrínseca do tipo <i>I</i>, pois sua dopagem tipo (<i>N-</i>) é relativamente mais baixa que as outras duas camadas [4] [2]. No diodo na topologia punch-through o campo elétrico na camada de depleção pode atingir a camada (N+) [4]. </span></div>
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<span style="font-family: inherit;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi7GA4b-bQGnsARkHKKJxLtBHLeNKhK24QWjsK9UOtqmM5OBe3eiWkv1uhHg1inbA5TNeo9cLNe22yXv7cX4drD4QREhm0q1IcMQsdq68Imz3s6I6Xtrt_aOiesIRI4bVfHEwBacjA8iXZi/s1600/diodo+PIN+estrutura.png"><img border="0" height="194" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi7GA4b-bQGnsARkHKKJxLtBHLeNKhK24QWjsK9UOtqmM5OBe3eiWkv1uhHg1inbA5TNeo9cLNe22yXv7cX4drD4QREhm0q1IcMQsdq68Imz3s6I6Xtrt_aOiesIRI4bVfHEwBacjA8iXZi/s1600/diodo+PIN+estrutura.png" width="320" /></a></span></div>
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<span style="font-family: inherit;">Figura 1 – Estrutura física das camadas do diodo PIN</span></div>
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<span style="font-family: inherit;">2.1.1) Tensão de Polarização Reversa. </span></h4>
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<span style="font-family: inherit;">A região de depleção do diodo PIN é formada por duas camadas sendo uma entre os materiais (P+) e (N-) e a segunda entre a camada (N-) e (N+), essa dupla camada de depleção altera a configuração do campo elétrico no interior do dispositivo, permitindo-o suportar uma maior tensão reversa. A existência da camada (N-) permite suportar uma diferença de potencial mais elevado quando o dispositivo é reversamente polarizado. A distribuição do campo elétrico no diodo PIN (Figura 2) apresenta uma forma trapezoidal e não mais triangular como nos diodos de junção PN de alta dopagem, apresentado na Figura 3. </span></div>
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<tr><td style="text-align: center;"><span style="font-family: inherit;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiA-k3ZZ3wDo8kueBzqRI7tvTERS2zIINziyW1rdMiIzWT4dDxBSJN6IZmj32vWJVgrbw2kw9n3_TtjcqXq7XkcB9-xRnxXrzgc4c0fSItzCKyzFZQeToBKmxvtMVLnTqIAWCI4DOKue5D1/s1600/Figura+2.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiA-k3ZZ3wDo8kueBzqRI7tvTERS2zIINziyW1rdMiIzWT4dDxBSJN6IZmj32vWJVgrbw2kw9n3_TtjcqXq7XkcB9-xRnxXrzgc4c0fSItzCKyzFZQeToBKmxvtMVLnTqIAWCI4DOKue5D1/s1600/Figura+2.png" /></a></span></td></tr>
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<span style="font-family: inherit;">No diodo PIN, a área do campo elétrico na região (<i>N-</i>) varia muito lentamente em quanto que nas regiões fortemente dopadas suas variações são mais acentuadas. Assim, o substrato (<i>N-</i>) impede o aumento elevado da região de depleção, quando fortes campos elétricos de polarização reversa são aplicados, pois o formato trapezoidal da distribuição do campo elétrico minimiza o comprimento da barreira evitando que ela atinja as extremidades do material e propicie à condução de um arco elétrico levando o dispositivo a queima. </span></div>
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<span style="font-family: inherit;">A introdução do material tipo <i>N</i> fracamente dopado também reduz a amplitude máxima do campo elétrico no interior do dispositivo e minimiza a destruição do material semicondutor por efeito de avalanche. Assim a tensão de bloqueio do dispositivo pode ser aumenta significativamente [5] [4]. </span></div>
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<span style="font-family: inherit;">2.1.2) Condução Direta. </span></h4>
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<span style="font-family: inherit;">As perdas por condução direta nos diodos de tecnologia <i>PIN</i> são maiores devido à presença de duas camadas de depleção e a existência da camada (<i>N-</i>), que possui características resistivas maiores por ser fracamente dopada [5]. </span></div>
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<span style="font-family: inherit;">No processo de condução direta, a junção formada por (<i>P+</i>) e (<i>N-</i>) injeta uma grande quantidade de lacunas no material (<i>N-</i>) neutralizando os portadores existentes no equilíbrio térmico e contribuindo para a atração de elétrons da camada (<i>N+</i>). Portanto, a região (<i>N-</i>) recebe uma grande quantidade de portadores das camadas vizinhas (Figura 4) e sua resistividade diminui como consequência. Esse processo leva o dispositivo à condução por um processo de difusão, de fato a condução se efetiva por portadores minoritários que são injetados na região (<i>N-</i>) pela camada (<i>P+</i>) e de portadores majoritários que saem da camada (<i>N+</i>) para (<i>N-</i>) [4].</span></div>
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<span style="font-family: inherit;">2.1.3) Velocidade de Chaveamento e Modulação de Condutividade. </span></h4>
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<span style="font-family: inherit;">A injeção de portadores na região (<i>N-</i>) reduz a resistividade do material e diminui as perdas por condução, porem esse efeito possui uma consequência negativa que interfere diretamente na velocidade de chaveamento do dispositivo. A velocidade de chaveamento do diodo PIN está relacionada com o tempo necessário para que os portadores de carga se recombinem na camada (<i>N-</i>), esse tempo que os elétrons e lacunas sobrevivem no material até se recombinarem no equilíbrio térmico é chamado de <i>LifeTime</i>. </span></div>
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<span style="font-family: inherit;">A região (N-) no estado de condução está com um grande número de portadores e quando uma tensão reversa é aplicada nos terminais do diodo a corrente de condução não é interrompida instantaneamente devido ao tempo que os portadores levam para se recombinarem e possa propiciar a extinção da corrente de condução. O tempo que o dispositivo permanece em condução após a aplicação da tensão reversa é chamado de tempo de recuperação reversa <i>trr</i> e é proporcional a quantidade de cargas de recuperação reversa <i>Qrr</i> armazenada na junção [6]. A Figura 5 ilustra o processo de chaveamento (Estado Ligado para Desligado) de um diodo com o fenômeno de recuperação reversa. </span></div>
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<span style="font-family: inherit;">Para que o diodo possa comutar entre o estado ligado e desligado rapidamente o tempo de recuperação deve se reduzir. A redução do <i>LifeTime</i> dos portadores da região (N-) pode ser feita através de um processo de modulação de condutividade que diminui significativamente o tempo de recuperação do dispositivo, essa redução é obtido através de processos que criam centros de recombinação adicionais no material que ajudam a acelerar a taxa de recombinação dos portadores. </span></div>
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<span style="font-family: inherit;">O processo de modulação reduz o tempo de recuperação reversa, porém traz como consequência a elevação da queda de tensão quando o diodo está diretamente polarizado, pois a adição de centros de combinação eleva a resistividade da região de depleção. Surge assim uma relação de compromisso entre redução do <i>LifeTime</i> e aumento da tensão de condução direta [2] [4]. </span></div>
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<span style="font-family: inherit;">2.2) Topologia Non-Punch-Through NPT e Recuperação Suave </span></h3>
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<span style="font-family: inherit;">A estrutura do diodo PIN baseada na topologia <i>punch-through</i> demostrou-se atraente para a redução da tensão no estado de condução direta devido ao pequeno tamanho da região de depleção. Entretanto, verificou-se que os dispositivos que possui essa tecnologia possui uma dificuldade para remover completamente as cargas armazenadas na região durante altos <i>di/dt</i> [5]. De fato, elevados <i>di/dt</i> no processo de recuperação reversa pode gerar transitórios de tensão em indutâncias parasitas do dispositivo. Uma alternativa para minimizar esses efeitos indesejáveis de tensão foi a criação da topologia <i>non-punch-through</i> NPT que oferece um processo de recuperação suave (<i>soft recovery</i>). </span><br />
<br />
<span style="font-family: inherit;">A Figura 6 ilustra uma simulação feita por [5] que apresenta um resultado comparativo entre os diodos PIN com topologia PT e NPT durante o processo de recuperação reversa. O diodo com a estrutura NPT proporciona uma corrente reversa mais suave que consequentemente reduz os picos de tensão no dispositivo. </span></div>
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<span style="font-family: inherit;">Na topologia NPT tem-se o acréscimo de uma quarta camada na estrutura do diodo PIN. A Figura 7 apresenta a estrutura física do diodo com tecnologia NPT, assim como no diodo com estrutura PT as camada (<i>P+</i>), (<i>N-</i>) e (<i>N+</i>) estão presente, porém existe uma quarta camada entre a região (<i>N-</i>) e (<i>N+</i>). </span></div>
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<span style="font-family: inherit;">A presença da camada <i>Nbuffer</i> proporciona a anulação do campo elétrico e impede sua propagação na camada (<i>N+</i>), para essa finalidade a concentração de portadores de carga na <i>Nbuffer</i> deve ser menor que as demais camadas. Com a adição de uma camada <i>Nbuffer</i> a distribuição do campo elétrico no interior do dispositivo também apresenta um formato trapezoidal, entretanto uma peça maior de silício é necessária e uma maior queda de tensão é esperada na condução direta. </span></div>
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<span style="font-family: inherit;">3) Análise Comparativa entre Dispositivos.</span></h3>
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<span style="font-family: inherit;"> </span></h3>
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<span style="font-family: inherit;">Analisando os dois retificadores, percebem-se diferenças para a tensão de condução direta, resistência e corrente de condução direta. A Tabela 1 apresenta os principais parâmetros dos dois dispositivos. </span></div>
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<span style="font-family: inherit;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEifGZlI6eer3xGHMhQO5Qy5XE2canc_gw1F1EHkldiMutVwqnKAt729ucqetfIJeql9Ph1ILhLyIzJPh4K24G8TFwX5zePjxWJgqbkQq3NvadAnMiJB0gEHP4gx2BL5rfwsXQOt7K2lPtDJ/s1600/Tabela+1.png"><img border="0" height="163" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEifGZlI6eer3xGHMhQO5Qy5XE2canc_gw1F1EHkldiMutVwqnKAt729ucqetfIJeql9Ph1ILhLyIzJPh4K24G8TFwX5zePjxWJgqbkQq3NvadAnMiJB0gEHP4gx2BL5rfwsXQOt7K2lPtDJ/s1600/Tabela+1.png" width="640" /></a></span></div>
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<span style="font-family: inherit;">A queda de tensão no estado de condução direta pode ser bem observada nos gráficos das Figura 6 e Figura 7. Para uma dada corrente de condução observa-se que o diodo SK95D12 possui uma menor queda de tensão em condução direta. O diodo SK80D12F é projetado para trabalhar em altas frequências de chaveamento utilizando técnica de controle de <i>LifeTime</i> axial que reduz o tempo de recuperação reversa e possibilita o funcionamento do dispositivo em altos . Vale notar também que o dispositivo SK80D12F possui também uma resistência de condução direta (<i>rt</i>) mais alto (Tabela 1) devido a adição de centros de recombinação para controle de <i>LifeTime</i>. </span></div>
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<br /></div>
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<span style="font-family: inherit;">A queda de tensão maior no módulo SK80D12F também pode ser ainda justificada pela sua característica de recuperação suave através da topologia NPT discutida anteriormente. Os diodos de recuperação rápida exigem uma pastilha de silício maior o que evidencia um aumento resistivo e queda de tensão na condução direta.</span></div>
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<span style="font-family: inherit;">O módulo retificador SK80D12F pode trabalhar em frequências de chaveamento elevadas com altos <i>di/dt</i> e com menos perdas, entretanto a quantidade de carga de recuperação passa ser expressiva e devem ser observada para a correta aplicação do dispositivo, assim o gráfico apresentado pelo fabricante (Figura 8), relaciona quantidade de carga de recuperação reversa pela taxa de variação da corrente, fornece informações para que o componente possa ser corretamente utilizado em operações de condução e chaveamento que minimize as perdas no módulo. </span></div>
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<div style="text-align: justify;">
<span style="font-family: inherit;">Um gráfico semelhante não é apresentado para o módulo SK95D12, pois ele é recomendado pelo fabricante para retificação em frequência da rede elétrica onde o <i>di/dt</i> de corrente são suaves e os portadores de carga possui tempo suficiente para se recombinarem quando o diodo é reversamente polarizado, assim a quantidade de carga armazenada na junção é mínima e o tempo de recuperação reversa pode ser desprezado. </span></div>
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<span style="font-family: inherit;">4) Conclusão. </span></h3>
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<span style="font-family: inherit;"> </span></h3>
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<span style="font-family: inherit;">Com esse trabalho pôde-se concluir que as características dos dispositivos semicondutores de potência devem ser cuidadosamente observadas e entendida para serem corretamente utilizados nas aplicações de potência. A estrutura do diodo PIN permite o funcionamento em tensões mais elevadas. Técnicas de fabricação com adição de centros de recombinação para diminuição do LifeTime permite que o dispositivo trabalhe em maiores níveis de com poucas perdas. Existe uma relação de compromisso entre redução do LifeTime e aumento da tensão de condução direta. </span></div>
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<br /></div>
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<br /></div>
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<span style="font-family: inherit;">5) Referências.</span></h3>
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<span style="font-family: inherit;"> </span></h3>
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<span style="font-family: inherit;"><span style="font-size: 12.0pt; line-height: 150%; mso-no-proof: yes;">[1].</span></span></div>
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<span style="font-family: inherit;">SEMIKRON. Datasheet SK 80 D 12
F. [S.l.].</span></div>
</td>
</tr>
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<span style="font-family: inherit;"><span style="font-size: 12.0pt; line-height: 150%; mso-no-proof: yes;">[2].</span></span></div>
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<td style="padding: .75pt .75pt .75pt .75pt;" valign="top"><div class="MsoNoSpacing" style="line-height: 150%;">
<span style="font-family: inherit;">SEMIKRON. Application Manual
Power Semiconductors. SEMIKRON
Internationa. Germany. 2011.</span></div>
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</tr>
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<td style="padding: .75pt .75pt .75pt .75pt;" valign="top"><div class="MsoNoSpacing" style="line-height: 150%;">
<span style="font-family: inherit;"><span style="font-size: 12.0pt; line-height: 150%; mso-no-proof: yes;">[3].</span></span></div>
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<td style="padding: .75pt .75pt .75pt .75pt;" valign="top"><div class="MsoNoSpacing" style="line-height: 150%;">
<span style="font-family: inherit;">SEMIKRON. Datasheet SK 95 D 12.
[S.l.].</span></div>
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<td style="padding: .75pt .75pt .75pt .75pt;" valign="top"><div class="MsoNoSpacing" style="line-height: 150%;">
<span style="font-family: inherit;"><span style="font-size: 12.0pt; line-height: 150%; mso-no-proof: yes;">[4].</span></span></div>
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<span style="font-family: inherit;">MOHAN, N. . U.; ROBBINS, W. P. Power
Electronics: Converters, Applications and Design. [S.l.]: John Wiley & Sons, 1995.</span></div>
</td>
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<span style="font-family: inherit;"><span style="font-size: 12.0pt; line-height: 150%; mso-no-proof: yes;">[5].</span></span></div>
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<td style="padding: .75pt .75pt .75pt .75pt;" valign="top"><div class="MsoNoSpacing" style="line-height: 150%;">
<span style="font-family: inherit;">BALIGA, B. J. Fundamentals of
Power Semiconductor Device. [S.l.]:
Springer, 2008.</span></div>
</td>
</tr>
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<span style="font-family: inherit;"><span style="font-size: 12.0pt; line-height: 150%; mso-no-proof: yes;">[6].</span></span></div>
</td>
<td style="padding: .75pt .75pt .75pt .75pt;" valign="top"><div class="MsoNoSpacing" style="line-height: 150%;">
<span style="font-family: inherit;">SEMIKRON.
Discrete-Explanation-Thyristores/Diodo. SEMIKRON International.
[S.l.].</span></div>
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Dentre os diversos aplicativos desenvolvidos com o objetivo de facilitar o desempenho de atividades práticas do usuário, seja no seu computador ou nos telefones móveis o ElectroCalc é uma ótima solução para os profissionais e Hobistas da área de elétrica e eletrônica. Sem duvida, ElectroCalc é um dos aplicativos mais completo para eletrônica. O App possui uma interface é fácil e intuitiva e acompanha informações úteis para utilização, dimensionamento, cálculos de componentes dos principais circuitos que são utilizados na elétrica e eletrônica. Confira as vantagens do ElectroCalc e baixe o seu !!!</div>
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Descrição do Aplicativo ElectroCalc</h2>
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ElectroCalc
é uma caixa de ferramentas poderosa para cálculos de projetos
Eletrônicos, Elétricos e Automação Industrial. Foi desenvolvido para
Hobistas, Técnicos e Engenheiros de qualquer nível, acelerando seus
projetos. </div>
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O ElectroCalc está disponível para Android . A versão Androide pode ser adquirida na licença FREE e PRO.</div>
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Confira as versões para Androide:</h3>
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<li><a href="https://play.google.com/store/apps/details?id=com.tja.eletro_calc_free" target="_blank">ElectroCalc - FREE</a>.</li>
<li><a href="https://play.google.com/store/apps/details?id=com.tja.eletro_calc_pro" target="_blank">ElectroCalc - PRO</a>.</li>
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A versão PRO não contém anúncios e está sempre crescendo, com novos cálculos e novas traduções!</div>
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Se gostou, não esqueça de Avaliar na Play Store!<br />
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Cálculos disponíveis no App ElectroCalc:</h2>
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<b>Básico</b><br />• Lei de Ohm<br />• Resistor - Código de Cores<br />• Resistência Equivalente<br />• Divisor de Tensão<br />
<b>Eletrônica</b><br />• Timer 555 - Monoestável<br />• Timer 555 - Astável<br />• Diodo Zener - Fonte de Tensão<br />• LM317 - Fonte de Tensão<br />• LM317 - Fonte de Corrente<br />• LED - Acionado em Vcc<br />• LED - Acionado em Vca<br />• Filtros Passivos - LPF e HPF<br />• Reatância Capacitiva - XC<br />• Reatância Indutiva - XL<br />• Indutor - Núcleo de Ar<br />• Amplificador Não Inversor<br />• Trilha de PCI<br />
<b>Elétrica</b><br />• Consumo de Energia<br />• Triângulo de Potências<br />• Unidades de Potência Ativa<br />• Cabos Flexíveis - Vca<br />• Diâmetro de Cabos Flexíveis<br />• Motor CA - RPM<br />• Motor CA - Plena Carga<br />
<b>Instrumentação e Controle</b><br />• Sensor 0..10V<br />• Sensor 0[4]..20mA<br />• Conversor Analógico Digital<br />• Tempo Real<br />• Interpolação Linear<br />• Regra de 3</div>
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Avaliação ElectroCalc Eletronicaemcasa:</h2>
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<li><b>Positiva:</b> Sem duvida, ElectroCalc é um dos aplicativos mais completo para
eletrônica e sua nova versão além de mais conteúdos possui mais detalhes para cada aplicação. O App possui uma interface é fácil e intuitiva e acompanha
informações úteis para utilização, dimensionamento, cálculos de
componentes dos principais circuitos que são utilizados na elétrica e
eletrônica. Além de conter um grande número de funções o aplicativo traz boas ilustrações e informações especificas de funcionamento e limitações de cada componente.</li>
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<li><b>Negativa:</b> As informações especificas de funcionamento e limitações de cada componente são suficiente, mas poderiam ser mais completas e melhor destacadas no aplicativo. </li>
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<b>Para reportar bugs, correções de traduções ou sugestões, envie um e-mail para <a href="mailto:tiagojavila@gmail.com">tiagojavila@gmail.com</a></b> </div>
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Guilhermehttp://www.blogger.com/profile/01893157551344267377noreply@blogger.com1tag:blogger.com,1999:blog-8832769654369184552.post-35232905594934134422013-12-17T13:43:00.002-02:002014-01-07T07:34:18.447-02:00Como Acionar um Relé com Arduino ou PIC - Projeto e Funcionamento<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhU0CRIS03PdtM4fAm3Bqqa67N6bmnN9sozYeY5op-qSGrBhfbaoOdX7sJIsgrhWqmhMJU8t2KhETJad2DMT_zhPUeO9IuQKG9dTPPdEKn5eSz3viOCcGp64XyFp3KohTtobD8zHhYJYBnd/s1600/hvfererg.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhU0CRIS03PdtM4fAm3Bqqa67N6bmnN9sozYeY5op-qSGrBhfbaoOdX7sJIsgrhWqmhMJU8t2KhETJad2DMT_zhPUeO9IuQKG9dTPPdEKn5eSz3viOCcGp64XyFp3KohTtobD8zHhYJYBnd/s320/hvfererg.png" height="229" width="320" /></a>Em muitos projetos de eletrônica há a necessidade de ligar ou desligar cargas externas como lâmpadas, motores e sirenes. Entretanto a maioria dos circuitos de controle funcionam com tensões baixa geralmente em 5V e 12V. Como ligar um motor ou uma lâmpada que funciona em outros níveis de tensão e potência com um microcontrolador PIC, arduino ou até mesmo amplificadores operacionais? Confira como acionar um relé com transistor corretamente e a dimensionar os componentes!</div>
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1.0 Introdução</h2>
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Em muitas situações tem-se a necessidade de comandar uma carga através de um circuito eletrônico. Em geral a carga a ser acionada pode exigir uma corrente e ou tensão muito maior que o circuito de lógica (micro controladores PIC, Arduino ou AOp) pode fornecer. </div>
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Em outras palavras, o problema se resume na potência que o circuito controle pode fornecer para acionar uma determinada carga. Na maioria das vezes a potência exigida para ligar um motor ou uma lâmpada é muito maior que a potência de uma saída do circuito de controle (Microcontrolador) fornece. Assim surge a necessidade de uma interface de potência que compatibiliza os níveis de potência entre o circuito de controle e a carga a ser controlada.</div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiwSfELfKz0oJIThwHLB6XSf_XIhSZEDVWN-YLx6faT1cjSerFOAh1hQjp4ApYvQPAaDisHT1aKGsvUZqOFKFB5ii9U4Af4l4LmThDqioCQiuynnTVKvJMTj58S_WNMrg4YrZFkCThvuDPh/s1600/interface.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Interface de potência com arduino e relé" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiwSfELfKz0oJIThwHLB6XSf_XIhSZEDVWN-YLx6faT1cjSerFOAh1hQjp4ApYvQPAaDisHT1aKGsvUZqOFKFB5ii9U4Af4l4LmThDqioCQiuynnTVKvJMTj58S_WNMrg4YrZFkCThvuDPh/s640/interface.png" height="489" title="Ligando relé com Arduino" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 1 - Interface de potência com relé.</td></tr>
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Uma maneira interessante e de baixa complexidade de fazer uma interface entre o circuito de comando e a carga é a utilização das chaves eletromecânicas conhecidas como relês. Outros dispositivos podem ser utilizados como transistores em geral e SCR, porem a complexidade de funcionalmente e dimensionamento aumentam.</div>
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2.0 Como Funciona um Relé</h2>
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O relé é uma chave eletromecânica (chave mecânica acionada por eletricidade), constituído por uma bobina e de contatos elétricos que podem estar normalmente abertos (NA) ou normalmente fechados (NF).</div>
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Quando uma corrente elétrica circula na bobina ela produz um campo magnético que produz uma força eletromagnética que atrai os contatos elétricos fechando ou abrindo os circuitos conectados a ele. Quando a corrente que circula na bobina é interrompida o contato elétrico volta para o seu estado normal com o auxilio de uma mola interna.</div>
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Os relés podem possuir várias chaves internas. A <i>figura 1</i> apresenta de forma esquemática a estrutura interna de um relé que possui duas chaves com um terminal em comum e na <i>figura 2</i> um relé com apenas uma chave.</div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiPC4KNiby3SPjmT7vp9osxXKcyGKQW_TJ4OyU2cIHe4Qc6eW2ojKk27skiLFs4VEp7gzfBOeCQbAL9N1HX3Zo-VORgWFCUp48WDbocu_TKENPmsxYvgBxIl1AL8Wp4AXepDT1ijjXalkfm/s1600/rele+figura+1.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiPC4KNiby3SPjmT7vp9osxXKcyGKQW_TJ4OyU2cIHe4Qc6eW2ojKk27skiLFs4VEp7gzfBOeCQbAL9N1HX3Zo-VORgWFCUp48WDbocu_TKENPmsxYvgBxIl1AL8Wp4AXepDT1ijjXalkfm/s640/rele+figura+1.png" height="256" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 2 - Estrutura do relé chave dupla.</td></tr>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi-ldpuuTwL6zcse1BB9Wk4KTCY-h0I9OrKC7KGKahmwpwqimLvDppkUxCJqxMwTwXjVX8KmQoHbNjH2OYNMOjICdvjsx3_RgViKdg1X6xcSkN9MwjqhXu2ioL9eyzBIrv-f7hKG00kbzCs/s1600/rele+figura+2.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi-ldpuuTwL6zcse1BB9Wk4KTCY-h0I9OrKC7KGKahmwpwqimLvDppkUxCJqxMwTwXjVX8KmQoHbNjH2OYNMOjICdvjsx3_RgViKdg1X6xcSkN9MwjqhXu2ioL9eyzBIrv-f7hKG00kbzCs/s640/rele+figura+2.png" height="234" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 3 - Estrutura do relé chave simples.</td></tr>
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2.1 Características elétricas de um Relé</h3>
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Como acionar um relé? Que tipos de circuitos externos podem ser controlados por um relé?</div>
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Quando utilizamos um relé num projeto é de fundamental importância ter a respostas para as duas perguntas acima. As informações que permitem avaliar do que um relé pode fazer e como deve ser usado se encontram nos manuais dos fabricantes, como os produtos da <a href="http://www.metaltex.com.br/" target="_blank">METALTEX</a> (Principal fabricante de relé no Brasil). Entretanto, a correta interpretação dessas informações se torna necessário para que não aconteçam surpresas desagradáveis. As características elétricas de um relé devem ser muito bem observadas. <br />
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Para energizar um relé corretamente e fazer com que as chaves internas atuem, é necessário que uma corrente de intensidade mínima circule pela sua bobina. Portanto, devemos aplicar uma tensão de um determinado valor, que em função da resistência do enrolamento, permita que a corrente mínima circule nos terminais da bobina. Na prática os relés são especificados em termos da corrente que deve passar em sua bobina para uma determinada tensão (Tensão nominal de funcionamento). </div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhk043g_BM5_noe_qeV3_JIHRXsWvenPrUz4gIEb46M0nlLbCYaxXCddXCsEktfZTpZeQgqFMfWfqK9tWve7KjDo0mT4aZlrjjsXJGHrQnX_LAJSHc6FSCnxCMtC_TcXdMWJFUcmzsLaxAe/s1600/medi%C3%A7ao.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Como funciona um relé" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhk043g_BM5_noe_qeV3_JIHRXsWvenPrUz4gIEb46M0nlLbCYaxXCddXCsEktfZTpZeQgqFMfWfqK9tWve7KjDo0mT4aZlrjjsXJGHrQnX_LAJSHc6FSCnxCMtC_TcXdMWJFUcmzsLaxAe/s200/medi%C3%A7ao.png" height="160" title="resistência interna da bobina de um relé" width="200" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 4 - Medição da resistência interna da bobina de um relé</td></tr>
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O valor da tensão nominal da bobina e da tensão e corrente máxima da chave é geralmente informado no próprio relé como mostrado na <i>figura 3</i>. Porem o valor da corrente que deve circular na bobina é somente informado nos manuais de fabricante <i>figura 5</i>, mas podem ser facilmente calculadas pela lei de Ohms já que se pode medir a resistência interna da bobina com um multímetro na função ohmímetro <i>figura4</i>. <br />
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As características elétricas das chaves do relé, tensão e corrente máxima suportada, também devem ser observadas em função da aplicação, para evitar a redução da vida útil do relé ou até mesmo sua queima imediata.<br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgWQOTfp9Hx1CVo-YIvB1xI91BDPzWtATzMO3Z8jfjaSJ1D0PD44tDb0JeN4GcPsJQk6U82kV-HZrbZYQJuUL4LRHSmiNBsvFQlHOpZc2xrM_kDyyKyWo9FXtgCLl0DNyrdRIHzay1Sw9Bp/s1600/especifica%C3%A7%C3%B5es.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Projeto de interface com relé" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgWQOTfp9Hx1CVo-YIvB1xI91BDPzWtATzMO3Z8jfjaSJ1D0PD44tDb0JeN4GcPsJQk6U82kV-HZrbZYQJuUL4LRHSmiNBsvFQlHOpZc2xrM_kDyyKyWo9FXtgCLl0DNyrdRIHzay1Sw9Bp/s640/especifica%C3%A7%C3%B5es.png" height="523" title="Como funciona um relé" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 5 - Característica elétricas de um relé </td></tr>
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Outra especificação importante em algumas aplicações é o tempo que o relé domara para fechar e abrir seus contatos. O tempo mínimo dos intervalos é indicado pelo fabricante que está em função da dinâmica elétrica e mecânica determinada pelas características da bobina e dos contatos respectivamente. Este valor varia de tipo para tipo e é informado tipicamente em milissegundos (ms).<br />
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Quando ocorre a interrupção da corrente na bobina as linhas de campo magnético na bobina se contraem gerando uma tensão de polaridade invertida em seus terminais, esse fenômeno bem definido pela lei de Lenz, <i>figura 6</i>.</div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEglzIGW16xWYSx90sDey2uNextAsOqA_mAFVrYJYiQhUnvRQjN5Z2rSHKnaiRcrsO7P9ZtPPrzbzC8Sgvld-yx3Zc2hhSeXZpHJTUSMfG9bjR-pZ9cWhA6Yk9zJr9WXRNykSVy0GBpwJ_38/s1600/reles.html_clip_image001_0002.gif" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEglzIGW16xWYSx90sDey2uNextAsOqA_mAFVrYJYiQhUnvRQjN5Z2rSHKnaiRcrsO7P9ZtPPrzbzC8Sgvld-yx3Zc2hhSeXZpHJTUSMfG9bjR-pZ9cWhA6Yk9zJr9WXRNykSVy0GBpwJ_38/s1600/reles.html_clip_image001_0002.gif" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 6 - Efeito de desmagnetização da bobina do relé.</td></tr>
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3.0 Projeto de Interface de Acionamento com Relé</h2>
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Partindo de um caso prático onde se quer controlar uma lâmpada incandescente através de um circuito microcontrolado utilizando um relé. Na tabela abaixo se tem as especificações da carga e do circuito de controle a ser utilizado.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEguzWCgdqpLFqmpYf_4z5rGOvfbTfvjbq71ZgagHvJzxqhpLdYBXjkGYf7nvJ1S6hBiSFAaZswVJYivHbfyX82vStGnc040iJ0l4KmVkBQ8ZcSD6pzsWyC3aozV46Ga1HV2QsfptrcwfArT/s1600/tabela1.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img alt="Como ligar um relé com arduino PIC" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEguzWCgdqpLFqmpYf_4z5rGOvfbTfvjbq71ZgagHvJzxqhpLdYBXjkGYf7nvJ1S6hBiSFAaZswVJYivHbfyX82vStGnc040iJ0l4KmVkBQ8ZcSD6pzsWyC3aozV46Ga1HV2QsfptrcwfArT/s640/tabela1.png" height="83" title="Arduino relé" width="640" /></a></div>
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Para o acionamento da carga utiliza-se um relé AY1RC2 da METALTEX de bobina 12V 30mA com contato 250V/10A para carga resistiva. O comando do relé através do microcontrolador é feita por um transistor. Pelo fato do relé necessitar 30mA para fechar seus contatos optou-se pelo transistor BC547A que atende a corrente de condução. As principais característica do BC547A estão listados na tabela abaixo.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhS-hVcD5DUileGu7Ozkwvk3L6QpwF83M3rPAIa5gyTExTTqL_iJwkpL3bVhTW77CLTPZFMJ09KfWhABq32dwjXsHihJ4Pk6f6B9VtxJ1qucWuY2mfQBZkHC7XaiY9SSnwAWD2sBJMbZhnU/s1600/tabela2.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img alt="Como ligar relé ao arduino" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhS-hVcD5DUileGu7Ozkwvk3L6QpwF83M3rPAIa5gyTExTTqL_iJwkpL3bVhTW77CLTPZFMJ09KfWhABq32dwjXsHihJ4Pk6f6B9VtxJ1qucWuY2mfQBZkHC7XaiY9SSnwAWD2sBJMbZhnU/s640/tabela2.png" height="90" title="Projeto arduino relé " width="640" /></a></div>
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Com as informações fornecidas pelo fabricante pode-se dimensionar o valor da resistência a ser colocada no terminal de base do transistor. Pela tabela acima é possível determinar o valor da corrente Ib que proporciona a corrente de coletor desejada (30mA). Dessa forma pode-se calcular o valor do resistor pela Lei de Kirchhoff em tensão como na <i>figura 7</i>.<br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhFII3yrUHsMW5a45Ut0LrC9FX1fkJHJ8SAAIjGQTF2azPHbuMX_ebw97FExARObsTnMqUpVueQYcf4Ll8NLV492gUpKX5zjoKzDqUXmGJU2KN2YUM1ZJpIBRRQ8jX1V1QTWsd5dE0wvK_1/s1600/reles.html_clip_image001_0002dc.gif" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Como ligar um relé com Arduino PIC" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhFII3yrUHsMW5a45Ut0LrC9FX1fkJHJ8SAAIjGQTF2azPHbuMX_ebw97FExARObsTnMqUpVueQYcf4Ll8NLV492gUpKX5zjoKzDqUXmGJU2KN2YUM1ZJpIBRRQ8jX1V1QTWsd5dE0wvK_1/s640/reles.html_clip_image001_0002dc.gif" height="415" title="Arduido e Relé " width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 7 - Projeto da interface de acionamento com relé.</td></tr>
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A tensão Vs=5V corresponde ao estado lógico 1 que o microcontrolador PIC ou Arduino fornece, a tensão Veb é a queda de tensão entre base e emissor do transistor. Uma vez que o valor de Beta vária em função da tensão Vce e da temperatura é conveniente escolher um valor de resistência menor que o calculado, um valor de 10KΩ se torna ideal para a aplicação proposta. Vale lembrar que o mesmo procedimento pode ser aplicado a outros tipos de relês e transistores sendo esse escolhidos em função do projeto. <br />
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O diodo D1 pode ser o 1N4148 que possui uma ação rápida e suporta picos instantâneos de corrente de até 0,5A. A utilização do diodo em paralelo com a bobina do relé tem a função de suprimir a corrente induzida quando se desliga o relé. O diodo encontra-se inversamente polarizado quando o transistor conduz, mas quando o transistor é desligado o diodo é polarizado diretamente pela tensão induzida na bobina fornecendo um caminho para a corrente de desmagnetização. O caminho para a corrente induzida oferecido pelo diodo evita a queima de componentes e interferência no circuito de controle. A utilização do diodo é extremamente importante.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgXJaV2KBGmFY5vLIR7_mq9wmyFXNw9ixHausDY9KJyAUNP698lWdOYEMX4frBYWD9k1zU6ykXhaHFUfcBNqZGfjw07hktSArnZ619n69EFVrXWpNg4e7hLdmZaBLUEVUv8ho9nuvZiGQRM/s1600/circuitojhf.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img alt="Como acionar um relé" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgXJaV2KBGmFY5vLIR7_mq9wmyFXNw9ixHausDY9KJyAUNP698lWdOYEMX4frBYWD9k1zU6ykXhaHFUfcBNqZGfjw07hktSArnZ619n69EFVrXWpNg4e7hLdmZaBLUEVUv8ho9nuvZiGQRM/s400/circuitojhf.png" height="117" title="Relé Arduino e PIC" width="400" /></a></div>
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4.0 Downloads</h2>
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Relé - <a href="https://dl.dropboxusercontent.com/u/42107535/Eletr%C3%B4nica%20em%20Casa/Blog/Como%20acionar%20um%20rel%C3%A9/AY.pdf" target="_blank">AY1RXX</a> <br />
Transistor - <a href="https://dl.dropboxusercontent.com/u/42107535/Eletr%C3%B4nica%20em%20Casa/Blog/Como%20acionar%20um%20rel%C3%A9/BC547A.pdf" target="_blank">BC547A</a><br />
Diodo - <a href="https://dl.dropboxusercontent.com/u/42107535/Eletr%C3%B4nica%20em%20Casa/Blog/Como%20acionar%20um%20rel%C3%A9/1n4148.pdf" target="_blank">1N4148</a><br />
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5.0 Conclusão</h2>
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Os relês são uma boa alternativa para o controle de cargas, pois possuem uma baixa complexidade de funcionamento. O dimensionamento dos componentes é simples e essencial para diminuir custos e garantir o correto funcionamento da interface de acionamento.<br />
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Guilhermehttp://www.blogger.com/profile/01893157551344267377noreply@blogger.com12tag:blogger.com,1999:blog-8832769654369184552.post-9634219896750985802013-10-02T11:23:00.002-03:002014-04-17T16:34:47.754-03:00Ponte-H com o Circuito L293 (Half Bridge)<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhC1JPhMKqkJ7dtVPfzfD1iA5SG5GbR7e8RozWXf_NanO2Uncxf5pyVs6fz0zris5pHACA3mdmvLkeUxhgoUUJ29UNnUn3HvT-0ek1pdmaVMyP96redsNt3Y4DyTxCLSnfVuTXsN1yhkM_Y/s1600/L293D.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img alt="Circuito ponte H com L293" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhC1JPhMKqkJ7dtVPfzfD1iA5SG5GbR7e8RozWXf_NanO2Uncxf5pyVs6fz0zris5pHACA3mdmvLkeUxhgoUUJ29UNnUn3HvT-0ek1pdmaVMyP96redsNt3Y4DyTxCLSnfVuTXsN1yhkM_Y/s1600/L293D.png" title="Ponte - H L293" /></a>Uma boa alternativa no controle de motores DC de baixa potência é a utilização do circuito integrado L293. Este pequeno circuito possui quatro drives bidirecionais que podem ser configurados para trabalhar como duas Ponte-H independentes, acionando dois motores diferentes com controle de sentido de giro. Confira o funcionamento desse componente e uma proposta de circuito impresso para ele.</div>
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Características do Circuito Integrado L293</h2>
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O circuito integrado L923 ou L293D possui drives de potência que podem funcionar como Ponte-H. A L293 é projetada para funcionar como um drive de corrente bidirecional de até 1A com tensões de 4,5V a 36V. Já o L293D trabalha com correntes de circulação de até 600mA com 4,5V a 36V também.<br />
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Os dois circuitos integrados são projetados para operar com cargas indutivas como relés, solenoides, motores DC, motores de passo bipolar, bem como outras cargas que exijam altas correntes e elevada tensão.</div>
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Na <i>figura 1</i> temos um exemplo de utilização da L293 mais geral em que controla 3 motores, sendo 2 motores unidirecionais e 1 bidirecional. A <i>figura 1</i> somente ilustra formas de utilização dos drives internos da L293 para diferentes aplicações. </div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgyhVUMTF61P6FgoZJOMUUxepoH_EYFocFPbGibXVsSzTrVtdFXenEaQO9z_wz3ndgzvvszSzANR771gNV-QFwU24j4JNbSBVXBG2YyiYu2DvH_rn-qRd6k027oE4Cy_SVJuTQICIdhzILs/s1600/aplica%C3%A7%C3%A3o+tipica+j.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Circuitos com a L293" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgyhVUMTF61P6FgoZJOMUUxepoH_EYFocFPbGibXVsSzTrVtdFXenEaQO9z_wz3ndgzvvszSzANR771gNV-QFwU24j4JNbSBVXBG2YyiYu2DvH_rn-qRd6k027oE4Cy_SVJuTQICIdhzILs/s400/aplica%C3%A7%C3%A3o+tipica+j.png" height="258" title="L293" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 1 - Utilização da L293.</td></tr>
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Comando lógico para L293</h2>
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Todas as entradas de lógica são compatíveis com os níveis TTL. Cada saída possui uma unidade com transistores Darlington que devem ser acionadas em pares, os drives 1 e 2 funcionam quando o pino Enable 1,2EN está ativado e os drives 3 e 4 funcionam quando o pino Enable 3,4EN está ativado. O circuito lógico dos drives internos da L293 é apresentado na <i>figura 2</i>.</div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhR1NJoqH5zI5CaFI2UX6zg0hBaKvL3ZSXDsxdbOlkGuCd2L3Zwa39bAjCWzpKzJgzVnNXYJdVMXvCBpdf-2m_IyqZhRjBeIIN97f8Lsp5oM5tHnmsrITxr4O0U06EAeegT5RHlp1khdT0-/s1600/Diagrama+de+logica.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Ponte H com a L293" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhR1NJoqH5zI5CaFI2UX6zg0hBaKvL3ZSXDsxdbOlkGuCd2L3Zwa39bAjCWzpKzJgzVnNXYJdVMXvCBpdf-2m_IyqZhRjBeIIN97f8Lsp5oM5tHnmsrITxr4O0U06EAeegT5RHlp1khdT0-/s320/Diagrama+de+logica.png" height="251" title="Circuito logico da L293" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 2 - Circuito lógico interno da L293</td></tr>
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Na tabela abaixo temos o funcionamento lógico para cada drive interno do L293. Observe que a saída segue a entrada quando o pino EN (Enable) está ativado. </div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEixqGDmLSCNsbERvqmSIWPYCrBJWFPst_CortLAGQDcwGvLPC4Mo7irSUQRkBjnNpfoFPATlZX741txM6fusEsiZsoyv8zbms1cblcmO-v1jaq6Fu37FjKyB19FZYNpfVfKsJ-vb_MVHrtd/s1600/Tabela+logica+de+comando.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img alt="Ponte H L293" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEixqGDmLSCNsbERvqmSIWPYCrBJWFPst_CortLAGQDcwGvLPC4Mo7irSUQRkBjnNpfoFPATlZX741txM6fusEsiZsoyv8zbms1cblcmO-v1jaq6Fu37FjKyB19FZYNpfVfKsJ-vb_MVHrtd/s320/Tabela+logica+de+comando.png" height="160" title="Tabela logica da L293" width="320" /></a></div>
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Quando o pino de habilitação (Enable) está ativado, os drives associados a esse pino EN estão ligados e suas saídas são ativadas em função de suas entradas. Quando o pino de habilitação (Enable) é posto em estado baixo, os drives associados a esse EN estão desligados e suas saídas estão no estado de alta impedância. </div>
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Com os comandos corretos nas entradas (1A, 2A, 3A, 4A), cada par de drives bidirecional <b>podem</b> (não necessariamente) forma um Ponte-H sendo adequada para aplicações com solenoide ou motores. Na <i>figura 3</i> e na tabela a seguir temos uma aplicação típica utilizando <b>dois</b> drives da L293 (<b>metade da L293</b>) como Ponte-H para controle de um motor.</div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8OeMYTTWP0GJ2d7BM2zn6gREESZBOM7jmc87d6O8V3yQ47D0DWRPUk8Rl8K_xBhoOM6txFP2MATWncvteM3xT9GYITdVRq8hKDbBeSMi0T364bXG56BGxqOYzzjSgr3wwdujAaM3Z8gfo/s1600/aplica%C3%A7%C3%A3o+2.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Circuito ponte H" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8OeMYTTWP0GJ2d7BM2zn6gREESZBOM7jmc87d6O8V3yQ47D0DWRPUk8Rl8K_xBhoOM6txFP2MATWncvteM3xT9GYITdVRq8hKDbBeSMi0T364bXG56BGxqOYzzjSgr3wwdujAaM3Z8gfo/s320/aplica%C3%A7%C3%A3o+2.png" height="253" title="Ponte H L293" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 3 - Funcionamento da L293 como Ponte-H.</td></tr>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjGyp1xFSxG90fw2XCL7iDmpjI889lToijtA_y3iY06RifN0Z8QfiNE4YPdCF5cBUkKQtEtwLPTxkpqRPksgrSK4__OHvyHx1WhO44vg3wv28molq6GKilG4ywQRW3MTk6pK4ejXA8E9EeK/s1600/Tabela+logica+de+comando+ponte+H.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img alt="Logica de controle da Ponte H L293" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjGyp1xFSxG90fw2XCL7iDmpjI889lToijtA_y3iY06RifN0Z8QfiNE4YPdCF5cBUkKQtEtwLPTxkpqRPksgrSK4__OHvyHx1WhO44vg3wv28molq6GKilG4ywQRW3MTk6pK4ejXA8E9EeK/s400/Tabela+logica+de+comando+ponte+H.png" height="180" title="Ponte H L293" width="400" /></a></div>
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Observações:</h3>
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Na L293, diodos de alta velocidade devem ser utilizados na saída para suprimir os transientes provenientes das correntes induzidas. Já na L293D os diodos podem ser suprimidos, pois existem diodos já incorporados internamente no dispositivo. Na <i>figura 4</i> ilustra uma comparação entre o L293 e o L293D para uma mesma aplicação de controle de um motor bifásico, observem a representação dos diodos no circuito.</div>
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A utilização da L293D reduz a complexidade da placa de circuito impresso, pois diminui o numero de componentes porem a corrente da carga para o L293D não pode ultrapassar os 600mA. Para o L293 essa corrente pode chegar até 1A. </div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhBkjAjWRaIUXFmt_VHNVJRXV4HKa_BhMfHebGiD0VJMYvt49r2cNSkj9jMqJpbecYuwNM-RY-yPhEn_VMtFh9i_5KKzietkjG-gUb5-vX7HNSoHalMaT_c9lWRpPc1PNFvxMoD-FmwsmUL/s1600/l2931D+compara%C3%A7%C3%A3o.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Pnte H" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhBkjAjWRaIUXFmt_VHNVJRXV4HKa_BhMfHebGiD0VJMYvt49r2cNSkj9jMqJpbecYuwNM-RY-yPhEn_VMtFh9i_5KKzietkjG-gUb5-vX7HNSoHalMaT_c9lWRpPc1PNFvxMoD-FmwsmUL/s640/l2931D+compara%C3%A7%C3%A3o.png" height="352" title="Diferença entre o L293 e L293D" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 4 - diferença interna entre a L293 e L293D.</td></tr>
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Tanto o L293 quanto o L293D são caracterizados por suportar uma temperatura de trabalho de 0°C a 70°C.</div>
Vale ressaltar também que o terminal Vcc1, separado do Vcc2, é destinado ao circuito de lógica para as entradas e minimiza a energia dissipada no dispositivo.<br />
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Na tabela abaixo temos um comparativos dos níveis de tensões e correntes permitidos pelos circuitos integrados.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEitLB7-rbaIsHOCjOfN5tPLUqMYCIBHw9IbR2oEbFivdTXAbwUxmnNhXfp9cID3ItftY4OQ4FleaBybWoDZ8yZLowScV-155vs_RDWlaLuqgeu29abcqpCsdaJCQajdRs2sKdMMm0WXVgV1/s1600/tabela+parametros.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img alt="Caracteristicas da L293" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEitLB7-rbaIsHOCjOfN5tPLUqMYCIBHw9IbR2oEbFivdTXAbwUxmnNhXfp9cID3ItftY4OQ4FleaBybWoDZ8yZLowScV-155vs_RDWlaLuqgeu29abcqpCsdaJCQajdRs2sKdMMm0WXVgV1/s320/tabela+parametros.png" height="141" title="Ponte H L293" width="320" /></a></div>
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Circuito Ponte-H para L293 ou L293D.</h2>
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Na figura 5 e 6 temos o layout da placa de circuito impresso. O download dos arquivos em pdf para confeccionar a placa se encontra logo abaixo.<br />
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Link dos arquivos: <a href="https://db.tt/NzC18ZcD" target="_blank">Arquivos de Projeto</a><br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhmuhrXzaxZEhFm8lE4J1DJadxMTtIyhZuZRlZISE24g1W063G7_KQHlpwCRIOGzlIH3sQSme81T2MhravdKJaHy_cfoWsR6yhcXrO09qaSBDsFaEchi7_456t3sLPHV_KasvzhC3yLG5G/s1600/circuito_trilhas2.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Circuito Ponte H L293" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhmuhrXzaxZEhFm8lE4J1DJadxMTtIyhZuZRlZISE24g1W063G7_KQHlpwCRIOGzlIH3sQSme81T2MhravdKJaHy_cfoWsR6yhcXrO09qaSBDsFaEchi7_456t3sLPHV_KasvzhC3yLG5G/s320/circuito_trilhas2.png" height="246" title="Projeto de Ponte H" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 5 - Trilhas</td></tr>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgUvxxKnF1H0kkZLxks781ewK0-_WDuvZGdl9lWjnA4IZPVoZ9OHkE3WHghLU4-iDFFGY-FRwHzYJpwYMlMXGeoEsaSxfRiz-_Z9QflzuCaxfslEmr6iqs9-PI5OvBwW8htmc2I5qy-K3c9/s1600/mascara2.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Circuito Ponte H L293" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgUvxxKnF1H0kkZLxks781ewK0-_WDuvZGdl9lWjnA4IZPVoZ9OHkE3WHghLU4-iDFFGY-FRwHzYJpwYMlMXGeoEsaSxfRiz-_Z9QflzuCaxfslEmr6iqs9-PI5OvBwW8htmc2I5qy-K3c9/s320/mascara2.png" height="246" title="Projeto ponte H" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 6 - Mascara</td></tr>
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O circuito proposto é um drive Ponte-H para dois motores DC 12V com corrente de pico máxima de 1A utilizando o CI L293. A alimentação é feita por uma fonte de 12V (Vcc2) que consiga fornecer a potência aos motores e uma fonte de 5V (Vcc1) para a lógica TLL. <br />
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O controle do Motor 1 é feita pelos comando EN_1, 1A e 2A. O controle do Motor 2 é feita pelos comando EN_2, 3A e 4A. A tabela de comandos é dada em "Tabela - Lógica de comando drive ponte H". O Pino Enable pode ser usado para o controle de velocidade do Motor se a técnica PWM for implementada pelo circuito de processamento. <br />
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Os diodos para suprimir as corrente induzidas são do tipo 1n4748 e os capacitores C1 e C2 são de 100nF do tipo cerâmico 50V. A placa suporta tanto a L293 quanto a L293D. Caso utilize o L293D os diodo podem ser suprimidos e a corrente de pico máxima dos motores devem ser menores que 600mA.<br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgpyvYLwKR7RcV6IYCpjHE32FGLMbKvwUcK7VsWQCIBd06v_9tyfNHUzuLkrmKXoGFqOP5g2dSd3zS34SSm_03eg8fFT_4DR_wG1lO892JRpYrqAfz67o4tt4Bza1c6l_mUnOyg8B1gcQwq/s1600/circuitof.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Controle de motores DC por PWM" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgpyvYLwKR7RcV6IYCpjHE32FGLMbKvwUcK7VsWQCIBd06v_9tyfNHUzuLkrmKXoGFqOP5g2dSd3zS34SSm_03eg8fFT_4DR_wG1lO892JRpYrqAfz67o4tt4Bza1c6l_mUnOyg8B1gcQwq/s640/circuitof.png" height="361" title="Ponte H com L293" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 7 - Montagem final da placa drive Ponte H.</td></tr>
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Talvez seja necessário a utilização de um dissipador de calor dependendo da potência das cargas a ser controladas. O dissipador deve ser soldado nos pinos de GND (4,5,12,13) e estar em contato com a superfície do CI. <br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6HOaQSotywEmlhcPfddh2TUzveTIZSw6RMaYWrGu1sj5O13qLo5DKux8f2bV3lqi81NR1vEixe6oJhqvViiifTKzJIxe0lWMRKPiPy_dU7Cw-wrYLKEDlKxqqQFHud57nM-eJFwmdlQBV/s1600/dissipador.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Dissipador de Calor para L293" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6HOaQSotywEmlhcPfddh2TUzveTIZSw6RMaYWrGu1sj5O13qLo5DKux8f2bV3lqi81NR1vEixe6oJhqvViiifTKzJIxe0lWMRKPiPy_dU7Cw-wrYLKEDlKxqqQFHud57nM-eJFwmdlQBV/s1600/dissipador.png" title="Ponte H " /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 8 - Dissipador de Calor.</td></tr>
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<h2 style="text-align: left;">
Lista de Componentes</h2>
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CI1 - L293<br />
C1, C2 - 100nF Capacitor cerâmico 50V.<br />
D1 a D8 - 1n4148<br />
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Guilhermehttp://www.blogger.com/profile/01893157551344267377noreply@blogger.com12Belo Horizonte - MG, República Federativa do Brasil-19.9190677 -43.938574700000004-20.3967837 -44.5840217 -19.4413517 -43.293127700000007tag:blogger.com,1999:blog-8832769654369184552.post-87506709514028338332013-09-02T14:43:00.003-03:002015-07-09T23:35:06.390-03:00SCR - Retificador Controlado de Silício: Como Testar um SCR<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgf2oEPb7u4xbSrYUBfZCJmzE_VhyphenhyphenBMEfGA7OukyMardKx7CPF1r837sBOKZ1_VvnsCQrSXAdMcG3sW55zRas_YSvS6mffUuLv2F7_8SMABw4mXrcZrevim_YR8OAvVoXsf3Jak0571JJu-/s1600/TESTANDO-SCR2.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img alt="Como testar um SCR" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgf2oEPb7u4xbSrYUBfZCJmzE_VhyphenhyphenBMEfGA7OukyMardKx7CPF1r837sBOKZ1_VvnsCQrSXAdMcG3sW55zRas_YSvS6mffUuLv2F7_8SMABw4mXrcZrevim_YR8OAvVoXsf3Jak0571JJu-/s1600/TESTANDO-SCR2.jpg" title="SCR - Retificador Controlado de Silício: Como Testar o SCR" /></a><span style="font-family: inherit;"><span style="font-size: small;">Como saber se um SCR está em bom estado. Neste artigo vou apresentar, de forma resumida, dicas para verificar se um tiristor do tipo SCR está ou não funcionando. Na eletrônica, muitas vezes, reutilizamos componentes das sucatas e os procedimentos para verificar se um determinado componente est</span></span><span style="font-family: inherit;"><span style="font-size: small;"><span style="font-family: inherit;"><span style="font-size: small;">á</span></span> funcionando é importante. Este é o ultimo artigo da série SCR – Retificadores Controlados de Silício.</span></span></div>
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<span style="font-family: inherit; font-size: large;">Introdução</span></h2>
<span style="font-family: inherit;"><span style="font-size: small;"><br />Para testar o SCR em polarização direta, podemos aplicar à porta (G) uma tensão e observar se ele permanece no estado ligado após essa tensão ter sido removida. Como discutido anteriormente nos artigos “<a href="http://eletronicaemcasa.blogspot.com.br/2013/08/Como-funciona-um-SCR.html" target="_blank">Como Funciona um SCR</a>” e “<a href="http://eletronicaemcasa.blogspot.com.br/2013/08/scr-retificador-controlado-de-silicio.html" target="_blank">Como disparar um SCR</a>”, um SCR pode ser comparado a um diodo normal controlado pela porta (G) “<i>gate</i>”. Sem um sinal de comando na porta ele não conduz “dispara”. Entretanto se uma tensão adequada for aplicada a porta G, ele é disparado e passa a conduzir em uma única direção como um diodo normal. Mas como fazer o teste para saber se um SCR está funcionando?</span></span><br />
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<span style="font-family: inherit; font-size: large;"><span style="font-family: inherit;">Como Testar o SCR</span></span></h2>
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<span style="font-family: inherit;"><span style="font-size: small;">Os SCRs de pequeno porte, com correntes baixas de sustentação, podem ser testados com um multímetro digital ou analógico de uso comum na eletrônica no modo ohmímetro. Na <i><span style="font-family: inherit;">F</span>igura 1</i> temos uma dica de montagem do circuito de teste do SCR com um ohmímetro. </span></span><br />
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjB9WGSZUv1X33TTRz8j5WSqhv_4zLcuevBfOqio1o1FYmqPfGqS30ta4K1E_i4PxirvQCVApddR2QZBXubQEZJ6QEDpVzhZdbDz4d7HlYLA8SUn04ABd7hKPucRIMJOlaz9ze8_DJbJYj8/s1600/teste+SCR.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Como testar um SCR, Procedimentos de testes" border="0" height="205" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjB9WGSZUv1X33TTRz8j5WSqhv_4zLcuevBfOqio1o1FYmqPfGqS30ta4K1E_i4PxirvQCVApddR2QZBXubQEZJ6QEDpVzhZdbDz4d7HlYLA8SUn04ABd7hKPucRIMJOlaz9ze8_DJbJYj8/s400/teste+SCR.jpg" title="SCR - Retificador Controlado de Silício: Como Testar o SCR" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 1 - Teste de um SCR com multímetro. </td></tr>
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<span style="font-size: small;">1° Passo:</span></h3>
<span style="font-family: inherit;"><span style="font-size: small;">Para realizar o teste corretamente desse componente devemos conectar os terminais positivo e negativo do multímetro no ânodo e no cátodo respectivamente. Esse procedimento ira polarizar o SCR diretamente. A leitura do ohmímetro deve ser muito alta, pois o tiristor está no estado desligado caso contrario ele é caracterizado como defeituoso (curto entre ânodo e cátodo).</span></span><br />
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<span style="font-family: inherit;"><span style="font-size: small;">2° Passo:</span></span></h3>
<span style="font-family: inherit;"><span style="font-size: small;">Em um segundo momento, devemos curto-circuitar a porta (G) com o ânodo (chave S1 fechada <i><span style="font-family: inherit;">F</span>igura 1</i>). Isso levará o SCR para o estado ligado e a leitura do multímetro deve diminuir e manter-se baixa mesmo depois do terminal porta ter sido retirado do curto (porta-ânodo) para estar em bom estado. Se o SCR estiver ligado durante o acionamento da porta, mas passar para o estado desligado no momento em que o terminal porta for removido, sua condição será duvidosa. </span></span><br />
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<span style="font-family: inherit;"><span style="font-size: small;"><b>Vale ressalta que a corrente fornecida por alguns multímetros pode não ser grande o bastante para manter o SCR acima de seu nível de corrente de sustentação [1]</b> <b>o que causa o desligamento do componente.</b> Durante os dois procedimentos de teste, o ânodo e cátodo devem estar conectados ao multímetro.</span></span><br />
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<span style="font-family: inherit;"><span style="font-size: small;">3° Passo:</span></span></h3>
<span style="font-family: inherit;"><span style="font-size: small;">Os mesmo procedimentos devem ser aplicados para a polarização reversa, ponta positiva e negativa ligada aos terminais cátodo e ânodo respectivamente. A leitura do ohmímetro deve ser sempre muito alta mesmo após a ligação da porta (G) a ponta de prova positiva.</span></span><br />
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<span style="font-family: inherit;"><span style="font-size: small;"><span style="font-size: large;">Resumo dos procedimentos de teste do SCR</span> </span></span></h2>
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<span style="font-family: inherit;"><span style="font-size: small;">Um resumo dos procedimentos de teste está ilustrado na <i><span style="font-family: inherit;">F</span>igura 2</i>.</span></span><br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhrppjmOw8_ljz7fBaNY_fi3dwuKIBm6oogLntaNpZTorLGySLhCEsRHC61mET5RhoU4RiyfhLbJQQQI3LiwW9wFTxiRcwtIWOaAKjEY3ZsC9Hnj1uGI3AcOlVEKk-y3q0ZOtczrxBMDJZ9/s1600/Sem+t%C3%ADtulo.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Como testar um SCR, passo a passo de como testar um SCR" border="0" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhrppjmOw8_ljz7fBaNY_fi3dwuKIBm6oogLntaNpZTorLGySLhCEsRHC61mET5RhoU4RiyfhLbJQQQI3LiwW9wFTxiRcwtIWOaAKjEY3ZsC9Hnj1uGI3AcOlVEKk-y3q0ZOtczrxBMDJZ9/s640/Sem+t%C3%ADtulo.jpg" title="SCR - Retificador Controlado de Silício: Como Testar o SCR" width="300" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 2 - Resumo passo a passo de como testar um SCR [2].</td></tr>
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Exemplos práticos com SCR</h2>
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Exemplos de circuitos utilizando um SCR podem ser conferidos nos links abaixo:<br />
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<li><a href="http://www.eletronicaemcasa.blogspot.com.br/2013/01/estroboscopio-de-potencia-ligado-em-127v.html" target="_blank">Estroboscópio de potência</a></li>
<li><a href="http://eletronicaemcasa.blogspot.com.br/2013/01/como-construir-uma-luz-ritmica.html" target="_blank">Luz Rítmica</a></li>
<li><a href="http://eletronicaemcasa.blogspot.com.br/2013/08/sensor-de-luminosidade-crepuscular.html" target="_blank">Sensor de luminosidade crepuscular</a> </li>
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<span style="font-size: large;">Conclusão </span></h2>
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Um procedimento simples de teste foi apresentado com o objetivo ajudar aos leitores menos experientes na eletrônica.<br />
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Referências</h2>
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<span style="font-size: small;"><span style="font-family: inherit;">[1]-Eletrônica de Potência</span></span>,<span style="font-size: small;"><span style="font-family: inherit;">Ashfaq Ahmed - 1° edição</span></span></div>
<span style="font-size: small;"><span style="font-family: inherit;">[2]-</span></span>Tiristor
SCR Retificador Controlado de Silício, Prof. Fernando Luiz Mussoi
CEFET/SC, EDIÇÃO PRELIMINAR – 1.1 FLORIANÓPOLIS – MARÇO, 2002.<br />
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Guilhermehttp://www.blogger.com/profile/01893157551344267377noreply@blogger.com6tag:blogger.com,1999:blog-8832769654369184552.post-68401095696130713652013-08-10T18:50:00.001-03:002013-08-30T21:01:30.589-03:00Sensor de Luminosidade Crepuscular<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjfToLtIpjLSXp2sIo0P6NUtrBrDj1KSOGELGX0uRrYtNJVKthtCfnWPMGCrwhYyONQt0CMCN73mBzkp0-f_nvvGhJgZHV4TOahNJh6L74d7YzvBFQA4XTw5Mndl1JKE74qHmydpUhFbHuj/s1600/foto+de+apresenta%C3%A7ao.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img alt="Controle de iluminação com o SCR" border="0" height="224" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjfToLtIpjLSXp2sIo0P6NUtrBrDj1KSOGELGX0uRrYtNJVKthtCfnWPMGCrwhYyONQt0CMCN73mBzkp0-f_nvvGhJgZHV4TOahNJh6L74d7YzvBFQA4XTw5Mndl1JKE74qHmydpUhFbHuj/s320/foto+de+apresenta%C3%A7ao.jpg" title="Sensor de Luminosidade Crepuscular" width="320" /></a><span style="font-family: inherit;"><span style="font-size: small;">Neste artigo um simples circuito, conectado a uma lâmpada incandescente, faz com que ela acenda em função da iluminação ambiente. O circuito descrito a seguir se trata de um sensor de luminosidade que proporciona um acionamento automático de uma lâmpada quando a luz ambiente diminui a certo nível ou apague quando a iluminação natural volta ao seu normal. Este tipo de circuito é conhecido como interruptor crepuscular.</span></span><br />
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<span style="font-family: inherit; font-size: large;">Introdução</span></h2>
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<span style="font-family: inherit;"><span style="font-size: small;">Muitas aplicações podem ser imaginadas para esse circuito se partirmos da idéia que podemos acionar uma lâmpada quando a iluminação, sobre o sensor, cair abaixo de um certo nível pré estabelecido. O funcionamento do circuito é semelhante ao sistema de iluminação p</span></span><span style="font-family: inherit;"><span style="font-size: small;"><span style="font-family: inherit;"><span style="font-size: small;">ú</span></span>blica presentes nos postes de ruas e avenidas.</span></span><br />
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<span style="font-family: inherit; font-size: large;">Descrição do Sensor de Luminosidade: Interruptor Crepuscular</span></h2>
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<span style="font-family: inherit;"><span style="font-size: small;">O circuito interruptor crepuscular poderá acionar somente lâmpadas incandescentes ou cargas resistivas com uma potência máxima de 100W (para a rede 127V) ou 200W (para rede 220V). Níveis de potência maiores podem ser obtidos mediante a alteração dos elementos de acionamento (SCR) e de retificação (ponte retificadora). Para aplicações domésticas, potência de iluminação de 100W e 200W são suficientes. <br /> </span></span></div>
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<span style="font-family: inherit;"><span style="font-size: small;">Uma desvantagem desse circuito é a presença de pequenas oscilações que ocorrem no estado de transição do circuito (Lâmpada desligada para Lâmpada ligada). Quando a transição da iluminação é lenta, como o caso do por do sol, o circuito não dispara instantaneamente, mas dá algumas piscadas antes de entrar em plena condução.<br />Porem o maior ponto positivo deste circuito, além de ser simples, é o fato dele não gastar energia, mesmo quando ligado, quando a lâmpada se encontra apagada. Assim mesmo com a lâmpada apagada o circuito não consume energia.</span></span></div>
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<span style="font-family: inherit; font-size: large;">Funcionamento e Dicas de montagem</span><span style="font-family: inherit;"><span style="font-size: small;"><br /></span></span></h2>
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<span style="font-family: inherit;"><span style="font-size: small;">Todos os componentes do interruptor crepuscular podem ser encontrados nas melhores casas de eletrônica, pois são componentes de uso geral. O funcionamento do circuito é inteiramente baseado no funcionamento de um SCR, sendo ele o responsável por ligar ou desligar a lâmpada por intermédio de um sinal de comando. O funcionamento de um SCR é melhor explicado nos post: “<a href="http://www.eletronicaemcasa.blogspot.com.br/2013/08/Como-funciona-um-SCR.html" target="_blank">Como funciona o SCR</a>” e “<a href="http://www.eletronicaemcasa.blogspot.com.br/2013/08/scr-retificador-controlado-de-silicio.html" target="_blank">Como disparar e desligar um SCR</a>”.</span></span><br />
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<span style="font-family: inherit;"><span style="font-size: small;">O segundo componente eletrônico importante para o circuito é o elemento sensível a luz, chamado LDR ou foto-resistor, que é um dispositivo que varia sua resistência em função da luz incidente, o LDR é muito usado na eletrônica. O LDR é o responsável pelo disparo do SCR em função da luminosidade.</span></span></div>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgWt4-EQpUMWvTkbMpFvGnBCgitpPBXaGmnZhv0wNHj2VmpLiP3dKz6h1tkr-8-y1OdmptlK0Tg9x8pgv9xspUCpxpcbXIFyTNjGtH5DYhPrhnbAQhj1R2ppBUppHPf3gL8c8X8gdtnDd3R/s1600/funcionamento.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Funcionamento do SCR pra iluminação automatica" border="0" height="288" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgWt4-EQpUMWvTkbMpFvGnBCgitpPBXaGmnZhv0wNHj2VmpLiP3dKz6h1tkr-8-y1OdmptlK0Tg9x8pgv9xspUCpxpcbXIFyTNjGtH5DYhPrhnbAQhj1R2ppBUppHPf3gL8c8X8gdtnDd3R/s640/funcionamento.jpg" title="Sensor de Luminosidade Crepuscular" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 1 - Funcionamento do sensor de luminosidade com SCR</td></tr>
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<span style="font-family: inherit;"><span style="font-size: small;">Na <i>figura 1</i> temos uma ilustração do funcionamento básico do circuito em função da luminosidade do ambiente. O foto-resistor faz o controle da corrente que é necessária para disparar o SCR. Quando o LDR está iluminado sua resistência interna é baixa, o que proporciona um melhor caminho para a corrente e evita que o SCR dispare. Quando o LDR se encontra no escuro sua resistência interna é elevada, a passagem da corrente é dificultada sendo drenada pela porta (G) do SCR, pois essa proporciona um melhor caminho nessa situação. Em outras palavras o LDR desvia a corrente de porta (G) para a terra quando se encontra iluminado (baixa resistência) e deixa a corrente chegar à porta (G) quando no escuro (alta resistência).</span></span><br />
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<span style="font-family: inherit;"><span style="font-size: small;">O SCR deve ser montado em um pequeno dissipador de calor, como mostrado na <i>figura 2</i> para evitar sobre cargas térmicas que podem levá-lo</span></span><span style="font-family: inherit;"><span style="font-size: small;"> a queima. </span></span><br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiKekdYDQKqSSmZdMIPf5HwrgoqYTEmm8VX8_RPaQxw7-08HhGbL_2eMbYnTnurCkaRbYdYEPoD83_dqgLWfNI7rNq94jTg_2RBtDuX8FBrD-GcM3uiONw6aR0QDxw2qoElgh9PfUBOShLU/s1600/TIC106.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Dissipador para sensor de luminosidade" border="0" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiKekdYDQKqSSmZdMIPf5HwrgoqYTEmm8VX8_RPaQxw7-08HhGbL_2eMbYnTnurCkaRbYdYEPoD83_dqgLWfNI7rNq94jTg_2RBtDuX8FBrD-GcM3uiONw6aR0QDxw2qoElgh9PfUBOShLU/s200/TIC106.jpg" title="Sensor de Luminosidade Crepuscular" width="156" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 2 - Montagem do dissipador de calor</td></tr>
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<span style="font-family: inherit;"><span style="font-size: small;"><span style="font-size: large;"><b>Montagem do Interruptor Crepuscular</b></span></span></span></h2>
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<span style="font-family: inherit;"><span style="font-size: small;">O circuito do sensor de luminosidade é apresentado na <i>figura 3</i>. O circuito de disparo contem um potenciômetro P1 que permite ajustar o momento de disparo do SCR em função da luminosidade ambiente. A montagem pode ser feita com uma placa de circuito impresso ou barras de terminais. </span></span><br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiaRe1q8WcwXuCse9t8S86XKqf0FhBPArG3WMUYrxqk_cGcnlIwe2NOqfBbBN-LGfctV4vDXiUQco6QI_DfnfrSbF1ITQiZcAEshp3hjoNLBW8vpFZe7oZ9nTKbtKdMij8Q4IEH5eKuZu_D/s1600/circuito.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Circuito para iluminação automatica com SCR" border="0" height="339" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiaRe1q8WcwXuCse9t8S86XKqf0FhBPArG3WMUYrxqk_cGcnlIwe2NOqfBbBN-LGfctV4vDXiUQco6QI_DfnfrSbF1ITQiZcAEshp3hjoNLBW8vpFZe7oZ9nTKbtKdMij8Q4IEH5eKuZu_D/s1600/circuito.jpg" title="Sensor de Luminosidade Crepuscular" width="627" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 3 - Circuito do sensor de luminosidade para interruptor crepuscular.</td></tr>
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<span style="font-family: inherit;"><span style="font-size: small;">Uma sugestão de layout para a placa de circuito impresso é dada na <i>figura 4</i>.</span></span><br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgW441VuC0NhW9VY-hUHlqQzQ8DeACjVHmS9PxF4pLSms6HEXyqLwulDAdbFvdvyr4_Shk1lUq4PwEgNkPvSRkR5RqA5iJyTNHXuhVBfkLtY_ANXOhdNtoVjlJOB9vDFfss0fpaXsz3hseO/s1600/layout.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Circuito para sensor de iluminação com SCR" border="0" height="277" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgW441VuC0NhW9VY-hUHlqQzQ8DeACjVHmS9PxF4pLSms6HEXyqLwulDAdbFvdvyr4_Shk1lUq4PwEgNkPvSRkR5RqA5iJyTNHXuhVBfkLtY_ANXOhdNtoVjlJOB9vDFfss0fpaXsz3hseO/s400/layout.jpg" title="Sensor de Luminosidade Crepuscular" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 4 - Sugestão de layout paro o interruptor crepuscular.</td></tr>
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<span style="font-family: inherit;"><span style="font-size: small;">Na montagem final o sensor de luminosidade (LDR) deve possuir uma abertura para captar a iluminação ambiente e ser posicionado de tal forma que a lâmpada a controlar não interfira com sua luminosidade.</span></span><br />
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<span style="font-family: inherit;"><span style="font-size: small;">Uma dica de instalação em ambientes externo é usar uma saboneteira ou qualquer caixa plástica para fixação do circuito. Para ambientes internos a alternativa é usar a própria caixa do interruptor de parede, se essa estiver bem localizada e oferecer a captação da luz ambiente de forma continua.</span></span><br />
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<span style="font-family: inherit;"><span style="font-size: small;">O circuito apresentado nas <i>figuras 5</i> foi instalado em uma saboneteira transparente e fixado na varanda com o objetivo de iluminar automaticamente o ambiente durante a noite e desligar durante o dia mesmo quando não estamos presentes. </span></span></div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEihLH546jbNhAEc_sg-MDe7Lkxd1aXiccih9wKMYyyBfNhE8HyqiOfzfgASjfxh8amQ2iNrYbu_aLQmVGtMyJuxx5vQDqiiTlemqCMIzvudrfve_RqyP0ppq5evG_DR-tgo7Ie_aIiWPgT_/s1600/prototipo+2.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Controle de iluminação automatica com SCR" border="0" height="272" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEihLH546jbNhAEc_sg-MDe7Lkxd1aXiccih9wKMYyyBfNhE8HyqiOfzfgASjfxh8amQ2iNrYbu_aLQmVGtMyJuxx5vQDqiiTlemqCMIzvudrfve_RqyP0ppq5evG_DR-tgo7Ie_aIiWPgT_/s640/prototipo+2.jpg" title="Sensor de Luminosidade Crepuscular" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 5 - Sugestão para montagem final e instalação do sensor de luminosidade crepuscular.</td></tr>
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Lista de Componentes</h2>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgafxs4oo3HHm34cqXhTDpnKdwNUqSiktc9HmUkgnz-6kR6MnLxJndaB1LrrQhrIt57pypEzgzgIHM6m4b9Oz-oirgCk3IZEFIZkBxXDil1apUwjx3MFgQcn0tlVxrr3cODMwfNua28ybPf/s1600/lista+de+comonentes.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img alt="Eletronica em Casa, controle de iluminação com SCR" border="0" height="507" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgafxs4oo3HHm34cqXhTDpnKdwNUqSiktc9HmUkgnz-6kR6MnLxJndaB1LrrQhrIt57pypEzgzgIHM6m4b9Oz-oirgCk3IZEFIZkBxXDil1apUwjx3MFgQcn0tlVxrr3cODMwfNua28ybPf/s640/lista+de+comonentes.jpg" title="Sensor de Luminosidade Crepuscular" width="640" /></a></div>
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Guilhermehttp://www.blogger.com/profile/01893157551344267377noreply@blogger.com20tag:blogger.com,1999:blog-8832769654369184552.post-27672581483466526892013-08-07T15:29:00.000-03:002013-08-07T20:11:02.129-03:00SCR - Retificador Controlado de Silício: Disparo e Interrupção do SCR<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEieH9bvzJJShL4GEd4LE6wEd0cgGysLea-q5K7CO5b8VWezB1JDkOG1FcNom5t7apNf4SX5vISNacvY6V-saZ4fooWr0mIycXKH8_9IZP0cMbZi7MmCVF5qOw86tP7r-jhm5KblUjCPdBIE/s1600/SCR.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="226" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEieH9bvzJJShL4GEd4LE6wEd0cgGysLea-q5K7CO5b8VWezB1JDkOG1FcNom5t7apNf4SX5vISNacvY6V-saZ4fooWr0mIycXKH8_9IZP0cMbZi7MmCVF5qOw86tP7r-jhm5KblUjCPdBIE/s320/SCR.jpg" width="320" /></a><span style="font-family: inherit;"><span style="font-size: small;">Retificador controlado de silício, como dispará-lo e interrompê-lo? Neste artigo vou complementar um pouco mais sobre os componentes de quatro
camadas apresentado em <a href="http://www.eletronicaemcasa.blogspot.com.br/2013/08/Como-funciona-um-SCR.html" target="_blank">SCR - Retificador Controlado de Silício: Funcionamento Básico.</a> Um resumo das formas de disparo e interrupção deste componente são apresentado a seguir. </span></span><br />
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<span style="font-family: inherit;"><span style="font-size: small;">No artigo anterior apresentei os tipos de SCRs descrevendo o seu funcionamento e suas características. Falei os motivos que levam este dispositivo entrar no estado de condução ou de interrupção. Agora veremos como fazer para disparar e desligar esse componente na eletrônica.</span></span></div>
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<span style="font-size: large;"><span style="font-family: inherit;">I</span></span><span style="font-family: inherit; font-size: large;">nterrupção do SCR</span></h2>
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<span style="font-size: small;"><span style="font-family: inherit;">Um SCR não pode ser desligado simplesmente com a remoção do sinal da porta (G), apenas alguns podem ser desligados aplicando-se um pulso negativo ao terminal da porta. Os dois métodos para desligar um SCR são classificados como interrupção da corrente do ânodo e técnica de comutação forçada [2].</span></span></div>
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<span style="font-size: small;"><span style="font-family: inherit;">Em aplicações CC a interrupção do retificador controlado de silício é feita por intermédio de um circuito externo. Nas <i>figuras 1a</i> e <i>1b</i> temos as duas possibilidades para a interrupção de corrente. Na figura <i>1a</i> a corrente <i>Ia</i> é levada a zero quando a chave em série é aberta. Já na <i>figura</i> <i>1b</i> a mesma condição é obtida quando uma chave paralela ao SCR é fechada [1][3]. Na verdade o SCR é interrompido ou sai do setado de ligado quando a corrente de condução cai abaixo do valor da corrente de sustentação. Outra forma de interromper um SCR é utilizando um capacitor de comutação.</span></span></div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgErcYAhUTAQjpoGQZLS3F58WfdQ7aFKAxqi6Sz0jaCDkx6GF3eAIkZZTJJj-dUCcU1PK1SI2-4vQfqyeRU_1csSc-v9GUZqWLvgA4SqOVLw1lHLKmGzQsQ_CD2dXIP5ECru5vTsl_CBGN_/s1600/desbloqueio.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Desbloqueio de um SCR" border="0" height="201" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgErcYAhUTAQjpoGQZLS3F58WfdQ7aFKAxqi6Sz0jaCDkx6GF3eAIkZZTJJj-dUCcU1PK1SI2-4vQfqyeRU_1csSc-v9GUZqWLvgA4SqOVLw1lHLKmGzQsQ_CD2dXIP5ECru5vTsl_CBGN_/s320/desbloqueio.jpg" title="Retificadores controlados de silicio - SCR" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 1 - Desbloqueio de um SCR [1].</td></tr>
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<span style="font-size: small;"><span style="font-family: inherit;">Porem, nas aplicações em corrente alternada o bloqueio do dispositivo ocorre de forma natural devido a inversão do sentido da corrente nos semiciclos negativos da fonte. Portanto não é necessária a utilização de circuitos adicionais para desligar o componente. </span></span></div>
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<span style="font-family: inherit; font-size: large;">Circuitos de acionamento para SCR</span></h2>
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<span style="font-size: small;"><span style="font-family: inherit;">Para o bom funcionamento dos sistemas que utilizam SCRs os circuitos de acionamento devem proporcionar o sinal de disparo no tempo correto, de modo que garanta a passagem para o estado ligado quando desejado </span></span><span style="font-size: small;"><span style="font-family: inherit;"><span style="font-size: small;"><span style="font-family: inherit;">[2][3]</span></span>. De modo geral o circuito de acionamento deve obedecer alguns pontos, que são:</span></span></div>
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<span style="font-size: small;"><span style="font-family: inherit;">Produzir um sinal na porta de amplitude e tempo de subida curto.</span></span></li>
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<li><span style="font-size: small;"><span style="font-family: inherit;">Produzir um sinal na porta com duração adequada.</span></span></li>
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<li><span style="font-size: small;"><span style="font-family: inherit;">Fornecer um controle de disparo preciso na faixa requerida.</span></span></li>
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<li><span style="font-size: small;"><span style="font-family: inherit;">Assegurar que o acionamento não ocorra em decorrência de ruídos.</span></span></li>
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<li><span style="font-size: small;"><span style="font-family: inherit;">Para aplicações AC, assegurar que o sinal na porta seja aplicado quando o SCR estiver diretamente polarizado.</span></span></li>
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<li><span style="font-size: small;"><span style="font-family: inherit;">Em circuitos trifásicos, fornecer, na porta pulsos que estejam 120° fora de fase em relação ao ponto de referencia.</span></span></li>
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<span style="font-size: small;"><span style="font-family: inherit;">Existem, basicamente, três tipos de sinais</span></span><span style="font-size: small;"><span style="font-family: inherit;"><span style="font-size: small;"><span style="font-family: inherit;"></span></span> para disparo, que são: Sinais DC, sinais pulsados e sinais AC.</span></span><br />
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<span style="font-family: inherit; font-size: small;">Dispara do SCR com Sinais DC</span></h3>
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<span style="font-size: small;"><span style="font-family: inherit;">Na <i>figura 2a</i> temos um circuito simples que proporciona um sinal CC para disparo a partir de uma fonte externa (<i>Eg</i>). A chave S é acionada para levar o SCR ao estado de condução [2]. </span></span><br />
<span style="font-size: small;"><span style="font-family: inherit;">O valor de <i>Rg</i> pode ser obtido pela formula: <i>Rg=(Eg-0,7)/Ig</i>. Onde <i>Ig</i> é dado pelo fabricante no datasheet.</span></span></div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjIzDLDIaMBCaaFXsshboYw6QQWAIW0eygOkq2W0FzsKbHQkkPCi6yWZ18bi2xt8RPsaiMuxtphe01s6Lm_khkFaZAqj9zJ04bG9Eam5oGEqM9CCIn0BReWSAi8LkLDhO22hhsBgL6TW3Se/s1600/disparo+scr+a.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Disparo de um SCR modo DC" border="0" height="230" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjIzDLDIaMBCaaFXsshboYw6QQWAIW0eygOkq2W0FzsKbHQkkPCi6yWZ18bi2xt8RPsaiMuxtphe01s6Lm_khkFaZAqj9zJ04bG9Eam5oGEqM9CCIn0BReWSAi8LkLDhO22hhsBgL6TW3Se/s320/disparo+scr+a.jpg" title="Retificadores controlados de silicio - SCR" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 2a - Disparo de um SCR com sinal CC [2].</td></tr>
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<span style="font-size: small;"><span style="font-family: inherit;">Um circuito alternativo para disparar o SCR sem a utilização de uma fonte externa é apresentada na <i>figura 2b</i>, o sinal é obtido da fonte principal.</span></span></div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhbCvwHxYYnOq35aoDxipBkIFUKFMs0OG48ixMLGHMN__Ou90uN0ca4EvR4HUs7XFJ4Ypnd9QEyxlLZFX-4VjJPPkpr7jTS-e1mp9Dt4fYHF-VWoocFStGrSmE8k5tHBP3xN1ZwtAZO7ldE/s1600/disparo+scr+b.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Disparo de um SCR, condução de um SCR" border="0" height="296" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhbCvwHxYYnOq35aoDxipBkIFUKFMs0OG48ixMLGHMN__Ou90uN0ca4EvR4HUs7XFJ4Ypnd9QEyxlLZFX-4VjJPPkpr7jTS-e1mp9Dt4fYHF-VWoocFStGrSmE8k5tHBP3xN1ZwtAZO7ldE/s320/disparo+scr+b.jpg" title="Retificadores controlados de silicio - SCR" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 2b - Disparo de um SCR com sinal CC [2].</td></tr>
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<span style="font-size: small;"><span style="font-family: inherit;">O resistor <i>R</i><span style="font-size: xx-small;"><i>L</i><span style="font-size: small;"> representa uma carga do circuito como uma lâmpada, por exemplo.</span></span> </span></span><br />
<span style="font-size: small;"><span style="font-family: inherit;">A presença do diodo D ligado entre a porta (G) e o cátodo (K) serve para proteger o SCR contra sinais negativos na porta. Em certos casos a aplicação de um sinal CC de disparo não é desejável, por causa da dissipação de energia que ocorreria durante todo o período de tempo.</span></span></div>
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<span style="font-size: small;">Disparo do SCR com<span style="font-family: inherit;"> Sinais Pulsados</span></span></h3>
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<span style="font-size: small;"><span style="font-family: inherit;">Para reduzir a dissipação de potência na porta, os circuitos de disparo do SCR podem gerar um único pulso, ou uma sequencia de pulsos, em vez de um sinal CC. Com o acionamento por pulso é fácil fornecer isolamento elétrico entre o circuito de comando e o SCR além de minimizar os sinais indesejáveis (ruídos) que poderiam disparar o SCR indevidamente. Na <i>figura 3a</i> e <i>3b</i> temos os circuitos mais comuns usados para acionar o SCR com um oscilador a transistor de unijunção (unijunction transistor – UJT) [2].</span></span></div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjIOvRYzXn_5naB7dnL_gi7kTwOOxJUUOIwPp5zpboqBdliAb7QwJtlk0jv6fMCQt0ftcIqJScXTVvMH9MZ-DcXJfE41OyWq6rF6CVsTjlTpx626Ut-jvOS_jQtlerZImf2djTWpi5vleD0/s1600/disparo+pulso.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Circuito de disparo de um SCR com transistor de unijunção UJT" border="0" height="362" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjIOvRYzXn_5naB7dnL_gi7kTwOOxJUUOIwPp5zpboqBdliAb7QwJtlk0jv6fMCQt0ftcIqJScXTVvMH9MZ-DcXJfE41OyWq6rF6CVsTjlTpx626Ut-jvOS_jQtlerZImf2djTWpi5vleD0/s640/disparo+pulso.jpg" title="Acionamento dos Retificadores controlados de silicio - SCR" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 3 - Circuito de disparo com oscilador a transistor de unijunção [2]. </td></tr>
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<span style="font-size: small;"><span style="font-family: inherit;">Circuito de acionamento com acoplamento óptico também pode ser usado. O disparo com acoplador óptico também evita o acionamento falso a partir de ruídos e de transitórios. Na figura 4 apresenta um exemplo de circuito.</span></span></div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEilG0jlTAIa8ROxNXfLo7U76eZRjj8QsiBx0EDiZ3AopXVzlEnxToiheUZJuJZNljuu7PbIZnk-HFhyphenhyphenKIGlXL9byAJnFYnYxJjmW9WEFNwgdNc2_qSmvjCLW1YKihj1CHYDCqOBGwCPsUn4/s1600/disparo+optico.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Circuito de dispara de um SCR com acoplador optico" border="0" height="225" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEilG0jlTAIa8ROxNXfLo7U76eZRjj8QsiBx0EDiZ3AopXVzlEnxToiheUZJuJZNljuu7PbIZnk-HFhyphenhyphenKIGlXL9byAJnFYnYxJjmW9WEFNwgdNc2_qSmvjCLW1YKihj1CHYDCqOBGwCPsUn4/s320/disparo+optico.jpg" title="Acionamento de um Retificadores controlados de silicio - SCR" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 4 - Circuito de disparo a acoplador óptico. </td></tr>
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<h3 style="text-align: left;">
<span style="font-size: small;">Disparo do SCR com<span style="font-family: inherit;"> Sinais AC</span></span></h3>
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<span style="font-size: small;"><span style="font-family: inherit;"><br /></span></span>
<span style="font-size: small;"><span style="font-family: inherit;">A maneira mais comum de controlar um SCR em aplicações AC é utilizar o sinal de disparo a partir da mesma fonte AC, pois o domínio do ponto de acionamento est</span></span><span style="font-size: small;"><span style="font-family: inherit;">á</span></span><span style="font-size: small;"><span style="font-family: inherit;"> no semi-ciculo positivo (quando o SCR está diretamente polarizado) [2][1]. Um circuito de comando é apresentado nas <i>figuras 5a</i> e <i>5b</i>.</span></span></div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiALiXLNQJbcidaFmDQalj-fPCJMxTgbLo5vPZKo1T53AUzxO4Csj9Dk_nqTfTdABLEcnVrqRlovcPouqzRmP4_GgpSItR5COSXLGgJyy_UA_DjwLWguN4e9sjg4qPEIf1VJbdgvWNv6IvD/s1600/disparo+SCR+AC.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="233" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiALiXLNQJbcidaFmDQalj-fPCJMxTgbLo5vPZKo1T53AUzxO4Csj9Dk_nqTfTdABLEcnVrqRlovcPouqzRmP4_GgpSItR5COSXLGgJyy_UA_DjwLWguN4e9sjg4qPEIf1VJbdgvWNv6IvD/s640/disparo+SCR+AC.jpg" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 5 - Controle de fase com SCR, Dimmer [2]</td></tr>
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<span style="font-size: small;"><span style="font-family: inherit;">Na <i>figura 5</i> o SCR está no estado ligado durante o semi-ciclo positivo. Em um determinado valor de <i>Vs</i>, a corrente que circulará para a porta (G) será alta o bastante para disparar o tiristor. O momento exato do disparo é controlado pelo reostato<i> R2</i>. O diodo <i>D</i> permite somente que uma corrente positiva seja aplicada a porta.</span></span></div>
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<span style="font-size: small;"><span style="font-family: inherit;">Os circuitos da <i>figura 5</i> é conhecido como controle de fase e é muito aplicado ao controle de potência entregue a cargas, pois esse circuito é capaz de estabelecer um ângulo de condução entre 0° a 90° da senoide da rede elétrica (figura 5a, 6 e 7). Ângulos de disparo maiores podem ser obtidos com a utilização de um capacitor que acrescenta um desacoplamento de 90°+ teta, onde teta esta em função da constante RC do circuito (<i>figura 5b</i> e <i>7</i>) [1][2]. Portanto é possível obter um controle de meia onda da energia entregue a carga, esse controle é popularmente conhecido como dimmer. </span></span></div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj3ziSuoSxw9muoknsPMEKJa-UJaZC6a38XCrJxJkQuMzuFSDCvQtw92YvKQmME4CCLAJMIr1fTP4Wc4sr5zp3mBmsoNIxjof0QRF9rtTFrojDdCgAwkPjLOQdSapDJOXt1lc9pOQkmysJc/s1600/P7250128.JPG" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj3ziSuoSxw9muoknsPMEKJa-UJaZC6a38XCrJxJkQuMzuFSDCvQtw92YvKQmME4CCLAJMIr1fTP4Wc4sr5zp3mBmsoNIxjof0QRF9rtTFrojDdCgAwkPjLOQdSapDJOXt1lc9pOQkmysJc/s320/P7250128.JPG" width="296" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 6 - Controle de fase com SCR</td></tr>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjCFVv_yfoHM8MA7G3zYhZBJq72mnwodDXqjB64CIo6nDHbB8-B-3KLUCOFvCr5pek-nh4m5lUeHj3jwxrGtGJ9BYXxOUbsZeIY7WHYAM6vDNde7fl3jAtfb09M_d0cDUvkdd4iHSdNhdqF/s1600/Apresenta%C3%A7%C3%A3o12.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="159" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjCFVv_yfoHM8MA7G3zYhZBJq72mnwodDXqjB64CIo6nDHbB8-B-3KLUCOFvCr5pek-nh4m5lUeHj3jwxrGtGJ9BYXxOUbsZeIY7WHYAM6vDNde7fl3jAtfb09M_d0cDUvkdd4iHSdNhdqF/s320/Apresenta%C3%A7%C3%A3o12.jpg" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 7 - Disparo do SCR em fase.</td></tr>
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<h2 style="text-align: left;">
<span style="font-size: large;">Exemplos de Aplicação</span></h2>
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<span style="font-size: small;"><span style="font-family: inherit;">Exemplos práticos de circuitos que utilizam os conceitos apresentados até aqui podem ser encontrados nos artigos: </span></span><br />
<ul>
<li><a href="http://eletronicaemcasa.blogspot.com.br/2013/01/como-construir-uma-luz-ritmica.html" target="_blank">Luz Rítmica</a></li>
</ul>
<ul>
<li><a href="http://eletronicaemcasa.blogspot.com.br/2013/01/estroboscopio-de-potencia-ligado-em-127v.html" target="_blank">Estroboscópio de Potência</a></li>
</ul>
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<h2 style="text-align: justify;">
<span style="font-size: large;">Conclusão</span></h2>
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Algumas noções para interrupção e disparo foram apresentadas brevemente assim como alguns circuitos para o acionamento do SCR. A compreensão do funcionamento do SCR pode ajudar entender melhor outros circuitos que utilizam desta tecnologia.</div>
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<h2 style="text-align: justify;">
<span style="font-size: small;"><span style="font-family: inherit;"><span style="font-size: large;">Referências</span></span></span></h2>
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<div style="text-align: justify;">
<span style="font-size: small;"><span style="font-family: inherit;">[1]-Eletrônica de Potência</span></span>,<span style="font-size: small;"><span style="font-family: inherit;">Ashfaq Ahmed - 1° edição</span></span></div>
<div style="text-align: justify;">
<span style="font-size: small;"><span style="font-family: inherit;">[2]-Dispositivos Eletrônicos e teoria de circuitos, Robert L. Boylestad, 8° edição.</span></span></div>
<span style="font-size: small;"><span style="font-family: inherit;">[3]-</span></span>Tiristor SCR Retificador Controlado de Silício, Prof. Fernando Luiz Mussoi CEFET/SC, EDIÇÃO PRELIMINAR – 1.1 FLORIANÓPOLIS – MARÇO, 2002.<br />
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Guilhermehttp://www.blogger.com/profile/01893157551344267377noreply@blogger.com2Minas Gerais, República Federativa do Brasil-19.924232150064345 -43.933081535937504-20.401948150064346 -44.5785285359375 -19.446516150064344 -43.287634535937507tag:blogger.com,1999:blog-8832769654369184552.post-11725097670058041162013-08-01T20:44:00.000-03:002013-08-04T23:05:16.383-03:00 SCR - Retificador Controlado de Silício: Funcionamento Básico <div dir="ltr" style="text-align: left;" trbidi="on">
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<![endif]--><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhINjfFPrd2Hf4UZhN_3xWR5vR9LGwssyF-xnK9LwIefKE96PHgwjCNoG5KtRHSiuYtC4R-TOxGbR2izQCQtDNe1pQBM6KojCdbM-BHUAH9hgjk_B1zNZlg03ndtkMtlbo0jsYEckw9FCk0/s1600/csr.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img alt="Como funciona um SCR" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhINjfFPrd2Hf4UZhN_3xWR5vR9LGwssyF-xnK9LwIefKE96PHgwjCNoG5KtRHSiuYtC4R-TOxGbR2izQCQtDNe1pQBM6KojCdbM-BHUAH9hgjk_B1zNZlg03ndtkMtlbo0jsYEckw9FCk0/s1600/csr.png" title=" SCR - Retificador Controlado de Silício: Funcionamento Básico " /></a><span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">O surgimento do diodo semicondutor de duas camadas nos levou em seguida
ao <a href="http://eletronicaemcasa.blogspot.com.br/2013/04/como-funciona-um-transistor-bipolar.html" target="_blank">transistor</a> formado por três camadas, entretanto dispositivos de quatro e até
cinco camadas também foram desenvolvidos e possuem grande importância na eletrônica
de potência. Neste artigo vou falar um pouco sobre os componentes de quatro
camadas tratando especificamente dos retificadores controlados de silício – SCR.</span></div>
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<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">Tiristor é o nome genérico de uma família de componentes que possuem
quatro camadas de <a href="http://eletronicaemcasa.blogspot.com.br/2013/02/materiais-semicondutores.html" target="_blank">material semicondutor</a> PNPN. Os tiristores são dispositivos
semicondutores de potência e são usados como chaves eletrônicas. Dos dispositivos PNPN, sem dúvida o retificador controlado de silício é
o que continua sendo alvo de interesse na eletrônica. Ele foi
desenvolvido nos laboratórios da <i>Bell Telephone Loboratories</i> em 1956. O SCR é amplamente usado na eletrônica de potência para o controle de réles, em circuitos
de retardo, fontes de potência regulada, chaves estática, controles de motores,
<i>choppers</i>, inversores, cicloconversores, carregadores de bateria, circuitos de
proteção, controles de aquecedores e controle de fase [1].</span></div>
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<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">Os retificadores controlados de silício (SCR) é o controlador elétrico
de potência de uso mais comum. A ação rápida de chaveamento, pequeno porte e
aos seus elevados valores nominais de corrente e tensão somam características
que tornaram os SCRs muito difundidos na eletrônica de potência.</span></div>
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<h2 class="MsoNoSpacing" style="text-align: left;">
<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: large; mso-ansi-language: PT-BR;">Descrição Geral dos Retificadores Controlados</span></h2>
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<br /></div>
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<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">O SCR é um componente de três terminais sendo eles: o ânodo (A) e o
catodo (k) e o terminal porta ou gate (G). O ânodo e o catodo são terminais de
potência já a porta é o de controle. </span></div>
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<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">De forma geral o SCR pode ser descrito como um <a href="http://eletronicaemcasa.blogspot.com.br/2013/02/como-funciona-o-diodo.html" target="_blank">diodo</a> controlado, ou
seja, a condução da corrente entre o ânodo e catodo é determinada por um sinal
de controle inserido na porta (G) [3]. A estrutura de um SCR é apresentado na <i>figura 1a</i>, e seu símbolo elétrico na <i>figura 1b</i>. </span></div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgkJaW6iHg8xJUboF8hK0Ifzkf6zGd5Rr98g5ByXxlhH90Hzmk03fjz0AqITY0B72CSs4tbApfn44Y8-YY9gK4SsoWRuno0r9AZlUHuySLZc25wXrhiLOR_IpP0nelq_IJz7wzjMtSYQUFt/s1600/simbologia.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Como funciona um SCR, teoria" border="0" height="166" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgkJaW6iHg8xJUboF8hK0Ifzkf6zGd5Rr98g5ByXxlhH90Hzmk03fjz0AqITY0B72CSs4tbApfn44Y8-YY9gK4SsoWRuno0r9AZlUHuySLZc25wXrhiLOR_IpP0nelq_IJz7wzjMtSYQUFt/s200/simbologia.jpg" title=" SCR - Retificador Controlado de Silício: Funcionamento Básico " width="200" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 1 -Estrutura (a) e Simbologia (B) [3]</td></tr>
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<![endif]--><span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">Quando o SCR está diretamente polarizado (ânodo é positivo em relação ao
cátodo) e uma tensão positiva (com relação ao cátodo) é aplicada na porta (G)
faz com que o SCR entre no estado ligado, funcionando assim, como um diodo.
Entretanto, não é a porta que interrompe a corrente que circula no SCR. Ela é
interrompida quando a corrente do ânodo cai abaixo de um determinado valor
chamado de corrente de sustentação. De forma similar ao que ocorre com um
diodo, o SCR bloqueia a corrente na direção inversa quando inversamente
polarizado. </span><br />
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<h2 class="MsoNoSpacing" style="text-align: left;">
<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: large; mso-ansi-language: PT-BR;">Modo de Disparo de um SCR</span></h2>
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<br /></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">Como fazer o disparo de SCR? Dizemos que um SCR é disparado ou entra em condução quando ocorre um
aumento da circulação de corrente no ânodo (Ia). O disparo pode ocorrer de 6
maneiras diferentes[3], sendo elas:</span></div>
<br />
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<li><span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">Corrente de gate Igk.</span></li>
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<div class="MsoNoSpacing" style="text-align: justify;">
</div>
<ul style="text-align: left;">
<li><span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">Corrente de retenção e corrente de manutenção.</span></li>
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<div class="MsoNoSpacing" style="text-align: justify;">
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<li><span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">Degrau de Tensão dv/dt.</span></li>
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<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">Entre o gatilho e cátodo há uma junção PN (<i>figura 1</i>) e assim como um diodo teremos
uma tensão de 0,7V, aproximadamente, entre os dois terminais. Com analise do
circuito da figura 2 podemos determinar a tensão de disparo requisitada.</span></div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiShXfx_WMGXZoTrjQGNgfuCV-uxgWcTd86wH2prDVMqKB_hBcVcGlf4Lvp1f_CzrqI21c4zr38J7TeL6Jqxk-XVd5s3Oeh2c9PEk80riw6V3Jzd6f8eJF-ReLtgl-X7vZ3JdzsVx7bGJIG/s1600/disparo+calculo2.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Como funciona um SCR, disparo de SCR" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiShXfx_WMGXZoTrjQGNgfuCV-uxgWcTd86wH2prDVMqKB_hBcVcGlf4Lvp1f_CzrqI21c4zr38J7TeL6Jqxk-XVd5s3Oeh2c9PEk80riw6V3Jzd6f8eJF-ReLtgl-X7vZ3JdzsVx7bGJIG/s1600/disparo+calculo2.jpg" title=" SCR - Retificador Controlado de Silício: Funcionamento Básico " /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 2 - Condição de disparo</td></tr>
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<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">Assim, tensão <i>Vdisparo</i> necessária para proporcionar a corrente de
disparo Ig através da resistência limitadora Rg pode ser dado por:</span></div>
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<h4>
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<h3>
<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;"><div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">Polarização Direta de um SCR</span></div>
</span><span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">
</span></h3>
<h4>
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</span></h4>
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<br /></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">Na ilustração da figura 3a temos o circuito de polarização direta de um
SCR, nela podemos verificar:</span></div>
<br />
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<li><span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;"><div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">Tensão do ânodo positiva em relação ao cátodo</span></div>
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<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">
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<li><span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;"><div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">J1 e J3 polarizadas diretamente.</span></div>
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<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">
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<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">J2 polarizado inversamente apresentando uma maior barreia de potencial.</span></div>
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<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">
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<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">Existe uma pequena corrente de fuga direta do ânodo para o cátodo, If
(Forward Current).</span></div>
</span></li>
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<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">
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<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">Bloqueio direto – Desligado. </span></div>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhBMTvkkk6ak_JEURGQ76h-uCgl-id5Fvfrs1PU7-iV3E3jhBt05DiVUdhot_wYIfXSq2E076Q5knuahjYpiP1_S0V5WH94_3advcgEcIVEj1ZECG0YdvR38TBOPdDw-lMR0IMYd61vkqxp/s1600/jun%C3%A7oes1.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Como funciona um SCR, estrutura interna" border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhBMTvkkk6ak_JEURGQ76h-uCgl-id5Fvfrs1PU7-iV3E3jhBt05DiVUdhot_wYIfXSq2E076Q5knuahjYpiP1_S0V5WH94_3advcgEcIVEj1ZECG0YdvR38TBOPdDw-lMR0IMYd61vkqxp/s320/jun%C3%A7oes1.jpg" title=" SCR - Retificador Controlado de Silício: Funcionamento Básico " width="265" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 3a - SCR diretamente polarizado [3]</td></tr>
</tbody></table>
</div>
<div class="separator" style="clear: both; text-align: center;">
</div>
<div class="MsoNoSpacing" style="text-align: justify;">
<br />
<br /></div>
<h3 class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">Polarização reversa de um SCR</span></h3>
<div class="MsoNoSpacing" style="text-align: justify;">
<br /></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">Na ilustração da <i>figura 3b</i> temos o circuito de polarização reversa de um
SCR, nela podemos verificar:</span></div>
<br />
<ul style="text-align: left;">
<li><span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">Tensão de cátodo positiva em relação ao ânodo.</span></li>
</ul>
<div class="MsoNoSpacing" style="text-align: justify;">
</div>
<ul style="text-align: left;">
<li><span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">J2 diretamente polarizada</span></li>
</ul>
<div class="MsoNoSpacing" style="text-align: justify;">
</div>
<ul style="text-align: left;">
<li><span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">J1 e J3 inversamente polarizadas: apresentam maiores barreiras de potencial</span></li>
</ul>
<div class="MsoNoSpacing" style="text-align: justify;">
</div>
<ul style="text-align: left;">
<li><span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">Flui uma pequena corrente de fuga reversa de cátodo para ânodo, Ir
(Reverse Current)</span></li>
</ul>
<div class="MsoNoSpacing" style="text-align: justify;">
</div>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;"></span></div>
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<br />
<br />
<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;"><table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjOVwMy0CoE7bjrrLzCg4ddqJmW8DNbkkfjmUKm-OTH7LuwVjoj50N4ZH1GKauEVuazYKH8Xf0MugmdeJQxg7caSckFjTd9dJTdjTPfUMnLzKlvuybtM8hUr6vmW25vMX6_16oKSoetLfQr/s1600/jun%C3%A7oes2.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="SCR funcionamento basico, disparo de um SCR" border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjOVwMy0CoE7bjrrLzCg4ddqJmW8DNbkkfjmUKm-OTH7LuwVjoj50N4ZH1GKauEVuazYKH8Xf0MugmdeJQxg7caSckFjTd9dJTdjTPfUMnLzKlvuybtM8hUr6vmW25vMX6_16oKSoetLfQr/s320/jun%C3%A7oes2.jpg" title=" SCR - Retificador Controlado de Silício: Funcionamento Básico " width="238" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 3b - SCR inversamente polarizado [3]</td></tr>
</tbody></table>
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<br />
<div class="MsoNoSpacing" style="text-align: justify;">
<br /></div>
<h2 class="MsoNoSpacing" style="text-align: left;">
<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: large; mso-ansi-language: PT-BR;">Curva característica de um SCR</span></h2>
<div class="MsoNoSpacing" style="text-align: justify;">
<br /></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">Na <i>figura 4</i> podemos observar uma curva característica de um SCR de forma
geral. Quando o SCR está diretamente polarizado podemos notar uma corrente
direta de fuga I<span style="font-size: x-small;">f</span> (Forward Current). Essa região e conhecida como região de bloqueio
direto. Porem se a tensão de polarização direta for aumentando até que alcance um
limite critico chamada de tensão de disparo direta V<span style="font-size: x-small;">fbo</span>, o SCR passa para o
estado ligado e a tensão entre o ânodo e cátodo do SCR cai para um valor mais
baixo (1-3V) e a corrente de condução aumenta no mesmo instante [1]. </span></div>
<div class="MsoNoSpacing" style="text-align: justify;">
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4w5-vSXnHMG23QjE9cdsDdb_vda05bTns-SrdNuCo-9-rrPNFApyNZ0zcoCJDP-2SObHODQZXJA25tMyPltFAH7bBI9FYTFbRwnH2nHVaMmw2BM5-hHIHMqUD-__6IU8jk3ejXGAKEcCR/s1600/curva+caracteristica.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Curva caracteristica de disparo de um SCR, funcionamento do SCR" border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4w5-vSXnHMG23QjE9cdsDdb_vda05bTns-SrdNuCo-9-rrPNFApyNZ0zcoCJDP-2SObHODQZXJA25tMyPltFAH7bBI9FYTFbRwnH2nHVaMmw2BM5-hHIHMqUD-__6IU8jk3ejXGAKEcCR/s400/curva+caracteristica.jpg" title="SCR - Retificador Controlado de Silício: Funcionamento Básico " width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 4 - Curva característica de disparo [1]</td></tr>
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<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">Entretanto, o valor da tensão de disparo direta V<span style="font-size: x-small;">fbo</span> pode ser controlada
pelo nível da corrente de porta I<span style="font-size: x-small;">g</span>. Se a junção porta-cátodo estiver
polarizada, o SCR passará para o estado ligado com uma tensão em um nível mais
baixo de disparo <span style="font-size: small;">em relação</span> a porta aberta (I<span style="font-size: x-small;">g</span>=0). À medida que a corrente de
disparo da porta aumenta, a tensão de disparo diminui e as características do
SCR se aproximam de um <a href="http://eletronicaemcasa.blogspot.com.br/2013/02/como-funciona-o-diodo.html" target="_blank">diodo</a>. </span></div>
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<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">Nota-se que o disparo com I<span style="font-size: x-small;">g</span>=0 não é uma característica desejável do
SCR. Na pratica, o SCR deve ser disparado somente com um sinal na porta.</span></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">Alguns dos circuitos para disparo do SCR podem ser visto nos próximos artigos do blog.</span></div>
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<br /></div>
<h2 class="MsoNoSpacing" style="text-align: left;">
<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: large; mso-ansi-language: PT-BR;">Desbloqueio ou Comutação do SCR</span></h2>
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<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">O desbloqueio de um SCR ocorre quando a corrente de condução direta cai
abaixo do valor da corrente de sustentação. Quando isso ocorre o esse SCR passa
ser novamente uma chave aberta e necessita de um novo sinal na porta (G) para
disparar.<span style="mso-spacerun: yes;"> </span>As formas de bloqueios ou
comutação são melhores discutidas no artigo SCR - Retificador Controlado de Silício: Disparo e Interrupção do SCR.</span><br />
<br />
<br />
<h2 style="text-align: left;">
<span style="font-size: large;">Exemplos de Aplicação</span></h2>
<br />
<ul>
<li><span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;"><a href="http://eletronicaemcasa.blogspot.com.br/2013/01/estroboscopio-de-potencia-ligado-em-127v.html" target="_blank">Estroboscópio de potência</a> </span></li>
</ul>
<ul>
<li><span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;"><a href="http://eletronicaemcasa.blogspot.com.br/2013/01/como-construir-uma-luz-ritmica.html" target="_blank">Luz Rítmica</a> </span></li>
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<br />
<div class="MsoNoSpacing" style="text-align: justify;">
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<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: large; mso-ansi-language: PT-BR;">Conclusão</span></h2>
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<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-ansi-language: PT-BR;">Esse pequeno resumo da funcionalidade do SCR pode nos ajudar a compreender melhor esse importante componente que é muito usado na eletrônica. O funcionamento relativamente simples do dispositivo nos possibilita a entender circuitos que utilizam o SCR com melhor clareza. </span></div>
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<span style="font-size: large;">Referência</span></h2>
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<div style="text-align: justify;">
<span style="font-size: small;"><span style="font-family: inherit;">[1]-Eletrônica de Potência</span></span>,<span style="font-size: small;"><span style="font-family: inherit;">Ashfaq Ahmed - 1° edição</span></span></div>
<div style="text-align: justify;">
<span style="font-size: small;"><span style="font-family: inherit;">[2]-Dispositivos Eletrônicos e teoria de circuitos, Robert L. Boylestad, 8° edição.</span></span></div>
<span style="font-size: small;"><span style="font-family: inherit;">[3]-</span></span>Tiristor
SCR Retificador Controlado de Silício, Prof. Fernando Luiz Mussoi
CEFET/SC, EDIÇÃO PRELIMINAR – 1.1 FLORIANÓPOLIS – MARÇO, 2002.<br />
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<br /></div>
Guilhermehttp://www.blogger.com/profile/01893157551344267377noreply@blogger.com5Belo Horizonte - Minas Gerais, Brésil-19.9190677 -43.938574700000004-20.3967837 -44.5840217 -19.4413517 -43.293127700000007tag:blogger.com,1999:blog-8832769654369184552.post-40534929278505711762013-07-15T13:47:00.000-03:002017-05-16T07:30:27.390-03:00Fonte de Tensão 12V-3A Ajustável e Fixa de 5V<div dir="ltr" style="text-align: left;" trbidi="on">
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<tr align="justify"><td><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg8px9nI3UVhyphenhyphen5OkV_hFL0kuzjIFGQ8Mgn_zj7XK3Owy8xz1aMwpUaK8kDrR3MEqDT8LYMywATMhm8VCLBEHvZGXJN1AXspJR4CVk7Fz84pTHBr5mFp0ellwHhYWvKE_ErWoJQF7DcxEfpX/s1600/fonte_wm_wm.jpg" imageanchor="1" style="clear: left; margin-bottom: 1em; margin-left: auto; margin-right: auto;"><img alt="Fonte de tensão ajustavel 12V, projeto" border="0" height="260" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg8px9nI3UVhyphenhyphen5OkV_hFL0kuzjIFGQ8Mgn_zj7XK3Owy8xz1aMwpUaK8kDrR3MEqDT8LYMywATMhm8VCLBEHvZGXJN1AXspJR4CVk7Fz84pTHBr5mFp0ellwHhYWvKE_ErWoJQF7DcxEfpX/s400/fonte_wm_wm.jpg" title="FONTE DE TENSÃO AJUSTÁVEL E FIXA" width="400" /></a></td></tr>
<tr align="center"><td class="tr-caption">Fonte de Tensão Ajustável e Fixa</td></tr>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";">Uma fonte de tensão para bancada é sempre muito importante para auxiliar os testes
dos circuitos eletrônicos. A fonte que será apresentada a seguir é do tipo
linear e possui duas saídas, sendo uma delas com tensão variável de 1,2V a 12V
com até 3A e a outra fixa em 5V com 500mA.</span></div>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif"; font-size: large;">Introdução</span></h2>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";">O projeto da fonte é
relativamente simples, pois se baseia nos circuitos integrados de regulação de
tensão LM317 e 7805. Informações mais detalhadas sobre esses componentes podem
ser encontradas diretamente em suas folhas de dados “datasheet”. A fonte conta
com duas saídas de tensão sendo uma ajustável e outra fixa.</span></div>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif"; font-size: large;">Funcionamento da Fonte Regulada</span></h2>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";">A saída de tensão ajustável varia
entre 1,2 a 12V e pode fornecer uma corrente de até 3A, quando a saída fixa não
é utilizada, graça ao uso do CI LM317 juntamente com um transistor bypass. O
LM317 além de possuir um melhor desempenho em relação aos reguladores fixos,
este dispositivo conta com um sistema interno de limitação de corrente e
proteção de sobrecarga térmica que permanecem totalmente funcionais mesmo quando
o terminal AJUST está desconectado. O transistor bypass não possui uma proteção
contra curto circuito sendo necessário o uso de sistema adicional como um fusível
por exemplo. A proteção térmica do transistor pode ser feita com o uso do próprio
LM317 se instalado no mesmo dissipador de calor. O circuito básico da saída ajustável
é apresentado na <i>figura 1</i>. </span><br />
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjXLf_VE2hyphenhyphenU3Mv7n-_s50A3nYGiOOd5_ZXuKtN2Z_GSyG67jiLsbUDj5kH8SSjtEh3AQYoYRYl5WtD2m3JSmDM8gGEIO3H0AzLxr0YeDhca6gFzgDWSKtYwRzD0EYKdtpgiaikPNEh-g3h/s1600/LM317comBy-pass2_wm.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Fonte de tensão variavel 12v 3A" border="0" height="192" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjXLf_VE2hyphenhyphenU3Mv7n-_s50A3nYGiOOd5_ZXuKtN2Z_GSyG67jiLsbUDj5kH8SSjtEh3AQYoYRYl5WtD2m3JSmDM8gGEIO3H0AzLxr0YeDhca6gFzgDWSKtYwRzD0EYKdtpgiaikPNEh-g3h/s320/LM317comBy-pass2_wm.jpg" title="FONTE DE TENSÃO AJUSTÁVEL E FIXA" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 1 - Saída ajustável de 1,2V a 12V</td></tr>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";">A tensão fixa é proporcionada
pelo CI 7805 e com uma corrente limite de 500mA. A limitação da corrente de
500mA é feita de forma proposital através do resistor R3 para evitar a queima do CI e sendo suficiente para
alimentar circuitos de lógica digital . </span></div>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";">O transformador para a fonte deve
ser do tipo 12V + 12V por 3A<span style="mso-spacerun: yes;">
</span>(transformador 12V com tap central 3A). O circuito completo da fonte é
apresentado na <i>figura 2</i> e <i>3</i>. A retificação é de onda completa para transformador
com derivação central. O diodo 6A10 suporta uma corrente de 6A de condução
direta e deve ser utilizado no projeto, entretanto diodos da série 1N5400,
que são mais comuns, podem ser associados em paralelo na própria placa para suportar
a corrente de condução sem o risco de queimar. </span></div>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjOPAGHAN3PK1Q_LciKjLRh_Kpo9A6gzJynyApUCP3cFF4SwM5C_i6_K3NEtvhROuyxKGRNHQgm_McLekjeznL88Oa5JqEzBI3EUyXGZ6DliYNa9NTrsfYOQ1oPftCb_EzJ0rOlAtUxZ86-/s1600/circuito_wm.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Projeto de fonte de tensão variavel e fixa de potência" border="0" height="347" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjOPAGHAN3PK1Q_LciKjLRh_Kpo9A6gzJynyApUCP3cFF4SwM5C_i6_K3NEtvhROuyxKGRNHQgm_McLekjeznL88Oa5JqEzBI3EUyXGZ6DliYNa9NTrsfYOQ1oPftCb_EzJ0rOlAtUxZ86-/s640/circuito_wm.jpg" title="FONTE DE TENSÃO AJUSTÁVEL 12V E FIXA 5V" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 2 - Circuito elétrico da fonte</td></tr>
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<tr><td style="text-align: center;"><img alt="Projeto de fonte de tensão ajustavel de potência, eletronica em casa" border="0" height="396" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh7UfUHsrM5iVS_w3lB6LsaKQKtqfXD76AQ3stDtk5Bdm2kkPvSxHKhjBTCZ-iZo7agu5IFzWI9Qi8iXS68h8tSVvD9iOjwDe47PpzWbzDQSMxFI8eM7BjWEmirNc49yeBB4wiIt_VmWtcY/s640/layout+montagem22.jpg" style="margin-left: auto; margin-right: auto;" title="FONTE DE TENSÃO AJUSTÁVEL E FIXA" width="640" /></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 3 - Layout para a fonte de tensão</td></tr>
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O download projeto completo da fonte pode ser feito no link: <a href="https://www.dropbox.com/s/f7cy13wsdoh3325/Fonte%20de%20tes%C3%A3o%2012V%203A%20ajustavel%20e%205V%20%5Bsenha%20www.eletronicaemcasa.blogspot.com.br%5D.rar?dl=0" rel="nofollow" target="_blank">Projeto Fonte de tensão ajustável 12V e fixa 5V</a><br />
[Senha: www.eletronicaemcasa.blogspot.com.br] <br />
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<span lang="PT-BR" style="font-family: "times new roman" , "serif"; font-size: large;">Montagem da Fonte Regulada </span></h2>
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<h3 style="text-align: left;">
<b>Dissipador de Calor para a Fonte de Tensão</b></h3>
<span lang="PT-BR" style="font-family: "times new roman" , "serif";">Os CI's e o transistor devem ser acoplados a um dissipador de calor para o bom funcionamento da fonte. O transistor e os reguladores de tensão devem estar acoplados termicamente mas isolados eletricamente de cada um, para isso é necessário a utilização de buchas isolantes nos parafusos e Thermal Pad para os CI's e transistor (<i>figura 4</i>). O Thermal Pad é um membrana condutora de calor e de isolamento elétrico, ela pode ser facilmente encontrada em sucatas juntamente com as buchas isolantes e parafusos (Facilmente encontrada em fontes de computadores). O dissipador de alumínio também pode ser reaproveitado das fonte de computador. </span><br />
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhf181asDc8GTK1UXDVAmRBNg_6a-ePW9s62eQqAiBYORKHZ8Bdhl147E2l1rwEn9dMnKQsVUcOvFGtRf05tLKfOdWLuO7lmX9kVK0HIatJw8vnpcD7UPPvt06grLmB1NtwaczAbifH_LnZ/s1600/thermal+pad2_wm.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Thermal Pad, Fonte de tensão variavel, projeto, eletronica em casa" border="0" height="230" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhf181asDc8GTK1UXDVAmRBNg_6a-ePW9s62eQqAiBYORKHZ8Bdhl147E2l1rwEn9dMnKQsVUcOvFGtRf05tLKfOdWLuO7lmX9kVK0HIatJw8vnpcD7UPPvt06grLmB1NtwaczAbifH_LnZ/s400/thermal+pad2_wm.jpg" title="FONTE DE TENSÃO AJUSTÁVEL E FIXA" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 4 - Acoplamento térmico dos componentes</td></tr>
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<h3>
<b>Potenciômetro de Ajuste de Tensão</b></h3>
<span lang="PT-BR" style="font-family: "times new roman" , "serif";">O potenciômetro P1 de 10k Ohms deve ser conectado separadamente a placa através de dois fios (<i>figura 5</i>). A conexão do potenciômetro é do modo reostato que pode ser conferido no post <a href="http://www.eletronicaemcasa.blogspot.com.br/2013/05/como-funciona-um-potenciometro.html" target="_blank">como funciona o potenciômetro</a>.</span></div>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgIQytFMoXbcL9InnikdwCxgIzbwxyW9LkKbGpOK1PzdVllFi4GvuIk7_VWdJ1ifYdbXpvUUPUQsmnkNVYx5VT4ZhsuLp2bLk3wUXC8_EgEQqtpHfxiuiZxXeVTNq0ArXgEAIgI3I_wsIWW/s1600/placa+montada_wm.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Projeto de fonte variavel de tensão de potência, eletrônica em casa" border="0" height="336" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgIQytFMoXbcL9InnikdwCxgIzbwxyW9LkKbGpOK1PzdVllFi4GvuIk7_VWdJ1ifYdbXpvUUPUQsmnkNVYx5VT4ZhsuLp2bLk3wUXC8_EgEQqtpHfxiuiZxXeVTNq0ArXgEAIgI3I_wsIWW/s400/placa+montada_wm.jpg" title="FONTE DE TENSÃO AJUSTÁVEL 12V-3A E FIXA 5V" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 5 -Fonte de Tensão Ajustável e Fixa</td></tr>
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<h3>
<b>Galvanômetro</b></h3>
<span lang="PT-BR" style="font-family: "times new roman" , "serif";">O circuito final pode ou não
contemplar o galvanômetro para a medição da tensão variável de saída (<i>figura 6</i>). Para a
utilização do galvanômetro de fundo de escala de 1mA o valor do resistor R5
deve ser 4k7 Ohms e o trim-pot P2 de 10k Ohms sendo este o responsável pelo
ajuste do fundo de escala da tensão medida, no nosso caso 12V. Caso o galvanômetro
não seja usado os componentes R5 e P2 podem ser suprimidos.</span><br />
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj38ASq4mbJdBQOXuFolEFZXWCo9eQ2KqkvXtTDptgNlXX8b2cLcSWhZgj6T6e6-xSq-_YUXma5SBbM3R1tAucFdatj3Kh-MctwRs-tAPCynIJoVVw_woj7OIMacM3IMtUYIeIN56nChCgZ/s1600/galvanometro.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Galvanômetro, eletronica em casa, projeto de fonte de tensão" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj38ASq4mbJdBQOXuFolEFZXWCo9eQ2KqkvXtTDptgNlXX8b2cLcSWhZgj6T6e6-xSq-_YUXma5SBbM3R1tAucFdatj3Kh-MctwRs-tAPCynIJoVVw_woj7OIMacM3IMtUYIeIN56nChCgZ/s1600/galvanometro.png" title="FONTE DE TENSÃO AJUSTÁVEL E FIXA" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 6 - Galvanômetro</td></tr>
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<h3>
<b>Caixa de Montagem</b></h3>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";">A montagem final da fonte pode
ser feita em uma caixa plástica para facilitar a sua utilização em bancada de
testes. Como sugestão proponho a utilização das caixas Patolas que oferecem
vários modelos de gabinetes. O layout do circuito foi projetado para o modelo <a href="http://www.patola.com.br/index.php?route=product/product&path=59_66&product_id=130">PB-211</a>
ou <a href="http://www.patola.com.br/index.php?route=product/product&path=59_66&product_id=127">PB-215</a>
que devem ser escolhida em função das dimensões do transformador. No meu caso utilizei o modelo PB-211, a montagem final pode ser conferida na <i>figura 7</i>.</span><br />
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi98gIy7CffupCmbtxtJUuF5KT0_0Ie8CoXs-9sXjruJdLUlW96Nw8BoZw6prxE2Ka45T3mnGYCzvH18fjs0WyFgUf0CGvLQa0ku5u8oqaaSyJFgwMmpg6KkP1UlkcKeZMvwQDY8ZlmGwko/s1600/fonte+final_wm_wm.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Projeto de fonte de tensão variavel de potência, eletronica em casa, fonte de tensão, fonte variavel, projetos de fontes" border="0" height="236" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi98gIy7CffupCmbtxtJUuF5KT0_0Ie8CoXs-9sXjruJdLUlW96Nw8BoZw6prxE2Ka45T3mnGYCzvH18fjs0WyFgUf0CGvLQa0ku5u8oqaaSyJFgwMmpg6KkP1UlkcKeZMvwQDY8ZlmGwko/s640/fonte+final_wm_wm.jpg" title="FONTE DE TENSÃO AJUSTÁVEL12V - 3A E FIXA 5V" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 7 - Montagem Final da Fonte de Tensão Ajustável e Fixa</td></tr>
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Lista de componentes</h2>
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Download da lista de componentes da fonte de tensão ajustável e fixa em pdf : <a href="https://www.dropbox.com/s/xaxanda9yq8d58f/Lisata%20de%20componentes.pdf?dl=0" rel="nofollow" target="_blank">Fonte de tensão.pdf</a><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh4fwPD6w6-eXy5ftLGSqfapmQaNWk0xS40AdAKLgmKWVpBWfZJs4k2JnvI6nFfSbV8enhK9KqFnn0j9ijhNBS-MUe9cXWjXLScjc7wCgUFI_ovcR2Crh0kes3Yev46q8rzWBBYMYl5uxN-/s1600/lista+de+compoenentes2.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img alt="Projeto de fonte de tensão variavel de potência, eletronica em casa, fonte de tensão, fonte variavel, projetos de fontes" border="0" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh4fwPD6w6-eXy5ftLGSqfapmQaNWk0xS40AdAKLgmKWVpBWfZJs4k2JnvI6nFfSbV8enhK9KqFnn0j9ijhNBS-MUe9cXWjXLScjc7wCgUFI_ovcR2Crh0kes3Yev46q8rzWBBYMYl5uxN-/s640/lista+de+compoenentes2.jpg" title="FONTE DE TENSÃO AJUSTÁVEL E FIXA" width="481" /></a></div>
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<h2>
<span style="font-size: large;">Conclusão</span></h2>
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Com poucos recursos,
criatividade e com componentes de uso geral, que são facilmente
encontrados em sucatas, é possível construir uma fonte para bancada de
testes que possa atender as necessidades de hobbistas, estudantes e
técnicos.<br />
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</div>
Guilhermehttp://www.blogger.com/profile/01893157551344267377noreply@blogger.com34tag:blogger.com,1999:blog-8832769654369184552.post-39230550851440922512013-07-07T22:14:00.003-03:002014-05-05T21:20:07.962-03:00Transmissor de FM para Fonte de Sinais Externos<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZ21V7WJXjzo0fMm2O9zN0JoJYopf_eECicTVYchG3GUSoT6O3K0Ri86falY3vGMIjPwvFLvtQJHNvdx5wZBgbEC0GRZKsyX-ZbhOgEtDOjC6mn7T7Q7GAn4DnXXNxUqsA1sR7raXCcvqN/s1600/montagem_wm.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img alt="transmissor FM" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZ21V7WJXjzo0fMm2O9zN0JoJYopf_eECicTVYchG3GUSoT6O3K0Ri86falY3vGMIjPwvFLvtQJHNvdx5wZBgbEC0GRZKsyX-ZbhOgEtDOjC6mn7T7Q7GAn4DnXXNxUqsA1sR7raXCcvqN/s320/montagem_wm.jpg" height="190" title="Transmissor de FM para Fonte de Sinais Externos" width="320" /></a>Transmita por ondas de rádio o som do seu mp3, celular ou computador para o rádio da sua casa ou carro sem usar fios. O transmissor FM descrito a seguir pode ser ligado na saída de som do computador, amplificadores de baixa potência, MP3, MP4 ou até mesmo em uma linha telefônica para transmitir conversas a distância.</div>
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<span style="font-size: large;">Introdução</span> </h2>
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O circuito é similar aos outros transmissores de FM já apresentado aqui no blog eletrônica em casa. Com uma alimentação de 3V a 6V e usando o <a href="http://eletronicaemcasa.blogspot.com.br/2013/04/como-funciona-um-transistor-bipolar.html" target="_blank">transistor</a> BF495 teremos um alcance entre 50 a 200 metros. Evidentemente, este alcance depende do local, da sensibilidade do receptor e do posicionamento da sua antena. O projeto completo deste transmissor pode ser baixado ao final do poste.<br />
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<span style="font-size: large;">Montagem do Transmissor FM</span></h2>
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Este transmissor deve conter um par de fios com garras jacaré para a sua ligação nas mais diversas fontes de sinais e podendo ser facilmente transportado, mas plugs podem ser usado para finalidades exclusivas como por exemplo o plug P2 para ligação da saída de som do computador. Para usar uma linha telefônica, como fonte de sinal, basta conectar a garra aos fios. Para transmitir sinais de outros aparelhos basta ligar a agarra na saída de áudio. O trim-pot P1 ajusta o nível de modulação para que não haja distorção do som. A montagem do circuito em uma caixa plástica facilita sua instalação sem riscos.</div>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgEakXMQcinXyvRXHblp_rPvfTd4EHgR1oh-VaVemvVynw8CwMRpXJN7eitU-gG0T7zSLpTjY_YHqZGyuA2DPxFnKgvsN67gqVM16dUVGkefcNTYh_6FX93mDHOtypK1kgkpBkVKkag1NaN/s1600/circuito_wm.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="transmissor FM" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgEakXMQcinXyvRXHblp_rPvfTd4EHgR1oh-VaVemvVynw8CwMRpXJN7eitU-gG0T7zSLpTjY_YHqZGyuA2DPxFnKgvsN67gqVM16dUVGkefcNTYh_6FX93mDHOtypK1kgkpBkVKkag1NaN/s400/circuito_wm.jpg" height="193" title="Transmissor de FM para Fonte de Sinais Externos" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 1 - Circuito elétrico do transmissor.</td></tr>
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O diagrama completo deste pequeno transmissor alimentado por pilhas é mostrado na figura 1. Na <i>figura 2</i> e <i>3</i> temos a disposição dos componentes numa pequena placa de circuito impresso. </div>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0je9GhHCX-gO4XI2Lm1PP3EafgraG2Vk3urRjZtx4nHdwNadTqgXNGpzkgQf1DKwO4pf2r_YteBoYyrj-KKj8H6FpsS4hUm1xMZ01viCDI8dhtRqAosCqa8BCP7NvBtCF3W_S7JvsJzmQ/s1600/circuito+layout_wm.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="transmissor de FM" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0je9GhHCX-gO4XI2Lm1PP3EafgraG2Vk3urRjZtx4nHdwNadTqgXNGpzkgQf1DKwO4pf2r_YteBoYyrj-KKj8H6FpsS4hUm1xMZ01viCDI8dhtRqAosCqa8BCP7NvBtCF3W_S7JvsJzmQ/s320/circuito+layout_wm.jpg" height="251" title="Transmissor de FM para Fonte de Sinais Externos" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 2 - Circuito impresso.</td></tr>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjrSEKqlko_LvC6mjKClSD-zVpwtNx3LThXv-cz7QpCgM6rOGK7_WX9XLvzIPpnJ7QS9K2Dz4_gnhTEDiZkRF-xwUYdyjV6t6aSrvRyPWy8tz658BRexwfVTB9RXjVBx0moS50KA20ml-FY/s1600/mascara.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="transmissor de FM espião" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjrSEKqlko_LvC6mjKClSD-zVpwtNx3LThXv-cz7QpCgM6rOGK7_WX9XLvzIPpnJ7QS9K2Dz4_gnhTEDiZkRF-xwUYdyjV6t6aSrvRyPWy8tz658BRexwfVTB9RXjVBx0moS50KA20ml-FY/s1600/mascara.jpg" title="Transmissor de FM para Fonte de Sinais Externos" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 3 - Figura 2 - Mascara Circuito impresso.</td></tr>
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A bobina poder ser construída manualmente. P<span lang="PT-BR">ara a faixa de FM entre 88Mhz a 108Mhz ela é formada por 4
voltas de fio comum (24 a 28 AWG) rígido em torno de uma lápis<i> (figura 4)</i>.</span> </div>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgMC_h72Mxl71l2Xv_WDFp_hJl6vHNWqrAuqPuwa-BhSE6K_bGSUH63GonK3VZj4X4EmJmda6L_DGqHtWz26ybzJVfis-oBZtI6u2WuM4-A9ipJic5VWx99GM1ConXrNE5ccrBq_uVW-gqr/s1600/trans_bobina.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="transmissor FM" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgMC_h72Mxl71l2Xv_WDFp_hJl6vHNWqrAuqPuwa-BhSE6K_bGSUH63GonK3VZj4X4EmJmda6L_DGqHtWz26ybzJVfis-oBZtI6u2WuM4-A9ipJic5VWx99GM1ConXrNE5ccrBq_uVW-gqr/s320/trans_bobina.png" height="151" title="Transmissor de FM para Fonte de Sinais Externos" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 4 - Fabricação da Bobina</td></tr>
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A sintonia é feita por intermédio do capacitor variável CV. O ajuste deve ser feito por uma chave não metálica para minimizar interferências. </div>
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O download do projeto completo pode ser feito no link: <a href="https://db.tt/804HsUbe" target="_blank">Projeto do transmissor de FM para sinal externo</a> </div>
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<span lang="PT-BR"><b>Confira o nosso Kit de Montagem Transmissor FM.</b></span></div>
<div style="text-align: center;">
<a href="http://produto.mercadolivre.com.br/MLB-518578685-transmissor-de-fm-espio-kit-para-montar-_JM" rel="nofollow" target="_blank"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhObFf70zJ4H4hJxx3aCWkUEnNGB8qb2gejuRbXEeUlOdOzp-UtTi_fxd1IuekpAf1WkHuIkutUy41mua3DAnnJ8MGMNRuMjK3d_IE9RhkLJbEpVRizhteDTw-fYVLFdrOBaI2Reh9lFZeJ/s320/rzgzgrg.png" height="165" width="200" /></a><span lang="PT-BR"><b> </b></span></div>
<div style="text-align: center;">
<span lang="PT-BR"><b>Enviamos para todo o Brasil</b></span></div>
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<h2 style="text-align: left;">
<span style="font-size: large;">Componentes para montagem</span></h2>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjQidePpMXAoVgrbQ9ubzaUokNJ5bUfaypPOqJRrvMvwpFuhK_7ZmWzSh8s7J2PoxOegwz5DN2Ji11HA44uBIJu-s0mO4Sy9XxQg7Vag5zXZwMHNtT45n6YVocMIPyZDlH1eHaX4LAhh5Eg/s1600/componenetes_wm.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img alt="como montar um transmissor FM" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjQidePpMXAoVgrbQ9ubzaUokNJ5bUfaypPOqJRrvMvwpFuhK_7ZmWzSh8s7J2PoxOegwz5DN2Ji11HA44uBIJu-s0mO4Sy9XxQg7Vag5zXZwMHNtT45n6YVocMIPyZDlH1eHaX4LAhh5Eg/s640/componenetes_wm.jpg" height="568" title="Transmissor de FM para Fonte de Sinais Externos" width="640" /></a></div>
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Guilhermehttp://www.blogger.com/profile/01893157551344267377noreply@blogger.com6tag:blogger.com,1999:blog-8832769654369184552.post-14816725923104215152013-07-05T17:36:00.002-03:002021-07-03T18:24:20.645-03:00Transmissor de FM para escuta espiã<div dir="ltr" style="text-align: left;" trbidi="on">
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<br />
<div class="MsoNoSpacing" style="line-height: 115%; text-align: justify;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiYAsg0XLJx-BPnZ5EzXQZNfD8Jg-hCL5NXtEqYjjZ6Vl6JxxvRk0TtFCU4XIGmEJy5sN4gLfKGJmaTeGjM0lslQFBOs0dJBapAt06BvCcnm3Pc8UhRjaldQ7itHdbBed2ONuJO3hXvdvzm/s1600/foto+apresenta%C3%A7%C3%A3o.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img alt="Transmissor FM tic tac eletronica em casa" border="0" height="225" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiYAsg0XLJx-BPnZ5EzXQZNfD8Jg-hCL5NXtEqYjjZ6Vl6JxxvRk0TtFCU4XIGmEJy5sN4gLfKGJmaTeGjM0lslQFBOs0dJBapAt06BvCcnm3Pc8UhRjaldQ7itHdbBed2ONuJO3hXvdvzm/s320/foto+apresenta%C3%A7%C3%A3o.jpg" title="Transmissor FM portatil" width="320" /></a><span lang="PT-BR" style="font-family: "Times New Roman","serif";">Que tal montar um mini
transmissor de FM supersensível para escutar as conversas secretas a distância?
Confira como construir este novo transmissor portátil.</span></div>
<div class="MsoNoSpacing" style="line-height: 115%; text-align: justify;">
<span lang="PT-BR" style="font-family: "Times New Roman","serif";">Neste projeto
apresento uma versão melhorada do pequeno <a href="http://eletronicaemcasa.blogspot.com.br/2013/01/transmissor-de-fm-portatil.html" target="_blank">transmissor de FM Portátil</a> exposto
anteriormente aqui no blog. Nesta versão do transmissor o microfone de
eletreto possui uma poderosa etapa de amplificação que aumenta sua
sensibilidade para ouvir conversas. </span><br />
<br />
<br />
<br />
<br />
<br />
<a name='more'></a></div>
<div class="MsoNoSpacing" style="line-height: 115%; text-align: justify;">
<h2 style="text-align: left;">
<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: large;">Introdução</span></h2>
<br />
<span lang="PT-BR" style="font-family: "Times New Roman","serif";">Os transmissores são
equipamentos de grande utilidade, pois podemos usá-los em situações de
emergência, comunicação ou até como escutas de detetives ou espionagem. Neste
poste apresento uma nova versão do pequeno </span><span lang="PT-BR" style="font-family: "Times New Roman","serif";"><span lang="PT-BR" style="font-family: "Times New Roman","serif";"><a href="http://eletronicaemcasa.blogspot.com.br/2013/01/transmissor-de-fm-portatil.html" target="_blank">transmissor de FM Portátil</a></span> anterior.
O alcance é da ordem de 50 a 200 metros dependendo da alimentação (3 a 6 Volts)
com o transistor BF495 e podendo captar conversas a uma distância superior a 5 metros.</span></div>
<div class="MsoNoSpacing" style="line-height: 115%; text-align: justify;">
<br /><br />
<h2 style="text-align: left;">
<span style="font-size: large;">Montagem do Transmissor FM super Sensível </span></h2>
<br /></div>
<div class="MsoNoSpacing" style="line-height: 115%; text-align: justify;">
<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 11pt; line-height: 115%; mso-ansi-language: PT-BR; mso-bidi-language: AR-SA; mso-fareast-font-family: Calibri; mso-fareast-language: EN-US; mso-fareast-theme-font: minor-latin;">A principal
modificação do transmissor apresentado na <i>figura 1</i> é a adição de uma etapa de amplificação para o
microfone de eletreto proporcionada pelo o transistor Q1 BC547 de uso geral. O transistor Q1 é
configurado com uma polarização de realimentação do coletor que possui uma
característica de alto ganho. </span><br />
<br />
<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 11pt; line-height: 115%; mso-ansi-language: PT-BR; mso-bidi-language: AR-SA; mso-fareast-font-family: Calibri; mso-fareast-language: EN-US; mso-fareast-theme-font: minor-latin;">Os sinais de áudio
poderão ser recebidos em qualquer aparelho de som/rádio que sintonize a
faixa FM. A sintonia do transmissor é feita através do trimmer (capacitor variável CV) como uma chave não metálica em frequência livre da faixa FM. Sua
construção é simples e possui um número reduzido de componente que são
facilmente encontrados nas melhores casas de eletrônica, a montagem final pode ser feita em uma caixinha de tic-tac.</span><br />
<br />
<span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 11pt; line-height: 115%; mso-ansi-language: PT-BR; mso-bidi-language: AR-SA; mso-fareast-font-family: Calibri; mso-fareast-language: EN-US; mso-fareast-theme-font: minor-latin;">O downloads dos arquivos para a montagem da placa pode ser feito no link no final desse poste. </span><br />
<br /></div>
<div style="text-align: justify;">
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg184qGQsKMq5f31Zj-OeVgh1cqbcEpKI-aBGhSS8xwg2Tl83AAU-JBP_3s9BUgfqB7C-PB4tnEuRyR8H7DStvsRimZVB1lGfizUvEoBJ74-yOtmr3P1JrC6aCf27X5mwyfEjFGkK5YCMPX/s1600/circuito_wm.jpg" style="margin-left: auto; margin-right: auto;"><img alt="Transmissor FM" border="0" height="243" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg184qGQsKMq5f31Zj-OeVgh1cqbcEpKI-aBGhSS8xwg2Tl83AAU-JBP_3s9BUgfqB7C-PB4tnEuRyR8H7DStvsRimZVB1lGfizUvEoBJ74-yOtmr3P1JrC6aCf27X5mwyfEjFGkK5YCMPX/s400/circuito_wm.jpg" title="Escuta espiã" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 1 - Circuito do transmissor FM super sensível</td></tr>
</tbody></table>
<div class="separator" style="clear: both; text-align: center;">
</div>
<br />
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjIaeMPOl825KDl1wQXohy1gVmNAz8dUyXfK1QXkDZyo5LhUB1jHH7y_HyUYjHeCZOPO3vmXY4pp7weNXpVInkCAhYcroqjxYu9Zmp8ZR1m2P2YbqmWhIkUGpdgy0_nTIDdnDHW-WrSb3UF/s1600/circuito+placa+geral_wm_wm.jpg" style="margin-left: auto; margin-right: auto;"><img alt="Transmissor FM portatil" border="0" height="178" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjIaeMPOl825KDl1wQXohy1gVmNAz8dUyXfK1QXkDZyo5LhUB1jHH7y_HyUYjHeCZOPO3vmXY4pp7weNXpVInkCAhYcroqjxYu9Zmp8ZR1m2P2YbqmWhIkUGpdgy0_nTIDdnDHW-WrSb3UF/s320/circuito+placa+geral_wm_wm.jpg" title="Transmissor FM" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 11pt; line-height: 115%; mso-ansi-language: PT-BR; mso-bidi-language: AR-SA; mso-fareast-font-family: Calibri; mso-fareast-language: EN-US; mso-fareast-theme-font: minor-latin;">Figura 2a - Sugestão para a placa de circuito impresso</span></td></tr>
</tbody></table>
<div class="separator" style="clear: both; text-align: center;">
</div>
<br />
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh_yGYRgmkoSKy44p0HSId9WBZ3oaR_y-c4X37mJHwAv7VuYFU8rpFpDYMB2ulbPgg4D6srwQWanPwHm1i8q9csVPyP4wyX-y6q9jw9ksW6qjoRT8jAtWcWLWhfBGqwxyI5ugElp3ErNmgV/s1600/circuito+placa+componente+geral_wm.jpg" style="margin-left: auto; margin-right: auto;"><img alt="Escuta espiã" border="0" height="177" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh_yGYRgmkoSKy44p0HSId9WBZ3oaR_y-c4X37mJHwAv7VuYFU8rpFpDYMB2ulbPgg4D6srwQWanPwHm1i8q9csVPyP4wyX-y6q9jw9ksW6qjoRT8jAtWcWLWhfBGqwxyI5ugElp3ErNmgV/s320/circuito+placa+componente+geral_wm.jpg" title="Transmissor FM portatil" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 2b - <span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: 11pt; line-height: 115%; mso-ansi-language: PT-BR; mso-bidi-language: AR-SA; mso-fareast-font-family: Calibri; mso-fareast-language: EN-US; mso-fareast-theme-font: minor-latin;"> Sugestão para a placa de circuito impresso </span></td></tr>
</tbody></table>
<div class="separator" style="clear: both; text-align: center;">
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<![endif]--><span lang="PT-BR" style="font-family: "Times New Roman","serif";">Na <i>figura 1</i> e <i>2</i> temos o
diagrama completo do circuito transmissor proposto. Para a faixa de FM entre
88Mhz 108Mhz a bobina é formada por 4 volta de fio comum (24 a 28 AWG) rígido
em torno de uma lápis (<i>figura 3</i>). O trimmer é uma capacitor variável entre 3 a
30pF. A captação do som é feita através de um microfone de eletreto. A antena
pode ser do tipo telescópica de 20 a 50cm ou então um pedaço de fio rígido.</span></div>
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<br /></div>
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgnN_dp22PmtRhlaDvdXXI0y8to7x9Lm9o2k8G10NsS5Zpez1FKCLbUrzYLLKkCgL3XGA4DEPpE_vZwoewa6e7p9kRHd-RQEOKFkant9zInmxqSA30-qlJbkWxIkpXlI-ZXJi7gml3GCzrW/s659/trans_bobina.png" style="margin-left: auto; margin-right: auto;"><img alt="Escuta espiã" border="0" height="150" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgnN_dp22PmtRhlaDvdXXI0y8to7x9Lm9o2k8G10NsS5Zpez1FKCLbUrzYLLKkCgL3XGA4DEPpE_vZwoewa6e7p9kRHd-RQEOKFkant9zInmxqSA30-qlJbkWxIkpXlI-ZXJi7gml3GCzrW/s320/trans_bobina.png" title="Tramissor FM super sensivel" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 3 - Confecção da bobina</td></tr>
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<span lang="PT-BR" style="font-size: 11pt; line-height: 115%; mso-ansi-language: PT-BR;"><span lang="PT-BR" style="font-family: "Times New Roman","serif";">Utilizando o BF495 com
o sistema alimentado entre 3V a 6V podemos obter de 50 a 200 metros de alcance. Essa atualização do mini transmissor também permite a utilização do
transistor o transistor 2N2218 ou equivalente com alimentação entre 9 a 12V que
fornecerá um alcance de até 1Km!!! Se o transistor 2N2218 for usado nas versões
de 9 e 12V devemos montá-lo com um dissipador de calor junta a placa e o
resistor R4 deve ser de 1W. </span></span></div>
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</xml><![endif]-->Downloads do projeto: <a href="http://db.tt/zyiL0AIx" target="_blank">Projeto do Transmissor FM </a><br />
[senha: www.eletronicaemcasa.blogspot.com.br]<br />
<br /><h2 class="MsoNoSpacing" style="text-align: left;"><span lang="PT-BR" style="font-family: "Times New Roman","serif"; font-size: medium; mso-fareast-language: FR;">Componentes de Montagem</span></h2>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg5l-q_e-_dftBaZGjJgIQnTftpVFLIHtrk2MUIUA_bbLScieMB40Bm4sKhNjC6N6bh2W556N0CielWBOTvnWoJmipV3eY_7SyKtxi0XTL6dXtXhGtcrhP7bnxkyxQ5uDG5CR_3_SiIMASw/s1600/lista+componentes.png" style="margin-left: 1em; margin-right: 1em;"><img alt="Transmissor FM - Eletronica em casa" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg5l-q_e-_dftBaZGjJgIQnTftpVFLIHtrk2MUIUA_bbLScieMB40Bm4sKhNjC6N6bh2W556N0CielWBOTvnWoJmipV3eY_7SyKtxi0XTL6dXtXhGtcrhP7bnxkyxQ5uDG5CR_3_SiIMASw/s1600/lista+componentes.png" title="Transmissor FM Escuta Espiã" /></a></div>
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<span lang="PT-BR" style="font-family: "Times New Roman","serif"; mso-fareast-language: FR;"><br /></span></div>
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<div class="separator" style="clear: both; text-align: center;">
</div>
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</div>
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Guilhermehttp://www.blogger.com/profile/01893157551344267377noreply@blogger.com10tag:blogger.com,1999:blog-8832769654369184552.post-68610520464173289762013-06-13T21:54:00.002-03:002017-06-04T16:21:47.115-03:00Amplificador de Áudio com LM386 <div dir="ltr" style="text-align: left;" trbidi="on">
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";"></span><span lang="PT-BR" style="font-family: "times new roman" , "serif";"></span></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgZhIZvAcS34BsVWoC3uRz6HfV29oTR5mKRx5JJ3oQ8RH34tRbIlk7cjU2ennyfbqeYrcL26sKVtsGV7mwzSFcSdG7fO9bup2Ym40LsUhPEpnZEDw_-QdRouK-jZx2PiBe9X5pdnxuqg9Tx/s1600/220px-LM386-Operational_amplifier.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img alt="Esquema elétrico de amplificador " border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgZhIZvAcS34BsVWoC3uRz6HfV29oTR5mKRx5JJ3oQ8RH34tRbIlk7cjU2ennyfbqeYrcL26sKVtsGV7mwzSFcSdG7fO9bup2Ym40LsUhPEpnZEDw_-QdRouK-jZx2PiBe9X5pdnxuqg9Tx/s1600/220px-LM386-Operational_amplifier.jpg" title="LM386 Amplificador de audio " /></a><span lang="PT-BR" style="font-family: "times new roman" , "serif"; mso-bidi-font-weight: bold;">O
Circuito Integrado LM386 é um pequeno amplificador de áudio de baixa potência,
ideal para pequenos projetos, podendo ser usado com uma infinidade de fontes de
sinal, tais como pequenos sintonizadores AM ou FM, placa de som do micro
computador, MP3, celulares ou como amplificador de teste na bancada.</span></div>
<span lang="PT-BR" style="font-family: "times new roman" , "serif"; mso-bidi-font-weight: bold;"> </span>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";"></span></div>
<a name='more'></a><h2 style="text-align: left;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif"; font-size: large;">Introdução</span></h2>
<br />
<div style="text-align: justify;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";">O Circuito LM386 é um
amplificador de potência projetado para aplicações de baixo consumo e níveis de
tensão reduzidos. O ganho interno deste circuito integrado é pré-fixado em 20
vezes (26db) para manter um número de componentes reduzidos, mas com a adição externa
de um resistor e um capacitor entre os pinos 1 e 8 nós podemos aumentar o ganho
global do circuito para qualquer valor entre 20 a 200 vezes (26 a 46 db).<span style="font-family: "times new roman" , "serif";"> </span>O integrado LM386 drena uma baixa
potência quiescente da ordem de 24mW operando a 6V. O LM386 se torna ideal para
aplicações com uso de bateria. </span><br />
<br />
<span lang="PT-BR" style="font-family: "times new roman" , "serif";">Uma versão estéreo do amplificador (<a href="https://www.blogger.com/blogger.g?blogID=8832769654369184552#editor/target=post;postID=165178021145875584;onPublishedMenu=posts;onClosedMenu=posts;postNum=0;src=postname" target="_blank">Amplificador Estéreo com o LM386</a>) pode ser encontrada em uma postagem mais rece<span style="font-family: "times new roman" , "serif";">nte do blog<span style="font-family: "times new roman" , "serif";">. </span></span> </span></div>
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<br /></div>
<h3 class="MsoNoSpacing" style="text-align: left;">
<b style="mso-bidi-font-weight: normal;"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Característica
de funcionamento do LM386</span></b></h3>
<div class="MsoNoSpacing" style="text-align: justify;">
<br /></div>
<ul style="text-align: left;">
<li><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Pode funcionar com baterias</span></li>
</ul>
<ul style="text-align: left;">
<li><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Necessita de poucos componentes
externos</span></li>
</ul>
<ul style="text-align: left;">
<li><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Tensão de operação entre 4 a 12V</span></li>
</ul>
<ul style="text-align: left;">
<li><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Ganho de tensão entre 20 a 200
vezes.</span></li>
</ul>
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<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";">Potência </span><span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">típica </span>de saída do circuito integrado é de 700mW para uma
tensão de alimentação de 9V e alto-falante de 8 Ohms. A pinagem do </span><span lang="PT-BR" style="font-family: "times new roman" , "serif";">LM386 é dada na <i>figura 1.</i> </span></div>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhPReqs7Hm7KmfYgVl4C3HCCZiIxzT-3I70qbe0NQj6RlypXCBvVbtkIHnZMFkKwxEnOPK7Gy19SVQNlqoCyiVDFZaNLUEvvP7Ygg4SK1x4BeHaCwquuVU6MfBCwRCgArlJstxIMgMxAZCU/s1600/LM386.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="LM386 Eletronica em casa " border="0" height="158" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhPReqs7Hm7KmfYgVl4C3HCCZiIxzT-3I70qbe0NQj6RlypXCBvVbtkIHnZMFkKwxEnOPK7Gy19SVQNlqoCyiVDFZaNLUEvvP7Ygg4SK1x4BeHaCwquuVU6MfBCwRCgArlJstxIMgMxAZCU/s200/LM386.png" title="Pinagem do LM386 amplificados de audio" width="200" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><h3>
Figura 1 - Pinagem do amplificador LM386.</h3>
</td></tr>
</tbody></table>
<br />
<h3 class="MsoNoSpacing" style="text-align: left;">
<b style="mso-bidi-font-weight: normal;"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Controle
de Ganho máximo</span></b></h3>
<br />
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";">O LM386 é um amplificador versátil,
pois o seu ganho global de tensão pode ser ajustado por dois pinos (1 e 8). Com
os pinos 1 e 8 abertos (<i>figura 2A</i>) o ganho é de 20 vezes (26db) mas se um
capacitor for colocado entre os pinos 1 e 8 (<i>figura 2B</i>) o ganho é aumentado
para 200 vezes (46db).</span></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<br /></div>
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjxqmM40w-mOFbqAQBP3IswLQv5-H1vSJHY223YUJEwmfLsb0sEU-U3BehdVhrLhskuu4S6Z66_77saMnBLXQ8l60EMsA5OrKYN-n4YsTP7u8ilBFN3S3ry1Ftti9Gshy40X0tD8tvzppoL/s1600/circuito+ganho.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="LM386 Eletronica em casa" border="0" height="212" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjxqmM40w-mOFbqAQBP3IswLQv5-H1vSJHY223YUJEwmfLsb0sEU-U3BehdVhrLhskuu4S6Z66_77saMnBLXQ8l60EMsA5OrKYN-n4YsTP7u8ilBFN3S3ry1Ftti9Gshy40X0tD8tvzppoL/s640/circuito+ganho.png" title="Circuito amplificador de audio com LM386" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><h3>
<span style="font-size: xx-small;">Figura 2A - Amplificador com ganho de 20 vezes. Figura 2B - Amplificador ganho com ganho de 200 vezes.</span></h3>
</td><td class="tr-caption" style="text-align: center;"></td><td class="tr-caption" style="text-align: center;"><br /></td><td class="tr-caption" style="text-align: center;"><br /></td></tr>
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<div class="MsoNoSpacing" style="text-align: justify;">
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<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";">Se um resistor for colocado em série com o capacitor o ganho
pode ser ajustado entre 26db a 46db (<i>figura 3</i>).</span></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<br /></div>
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgNNBmpgMbgQqvR6FXMCZKG-HIYYMNceUEgqqboJUG8Cg8cGqNgg5duLFC4qaF4U2ySFwiNQEVPMsxxlkgswRN1jBen3MFeuGdqGAUYePap1Jerf_k6ciqbRQxZ8lJgFGizFmhf5ctFh2uc/s1600/LM386+ganho+50.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Eletronica em casa" border="0" height="238" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgNNBmpgMbgQqvR6FXMCZKG-HIYYMNceUEgqqboJUG8Cg8cGqNgg5duLFC4qaF4U2ySFwiNQEVPMsxxlkgswRN1jBen3MFeuGdqGAUYePap1Jerf_k6ciqbRQxZ8lJgFGizFmhf5ctFh2uc/s320/LM386+ganho+50.png" title="Amplificador de audio LM386" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 3 - Amplificador com ganho de 50 vezes (34db).</td></tr>
</tbody></table>
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<br /></div>
<h2 class="MsoNoSpacing" style="text-align: left;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span style="font-size: large;">Montagem do Circuito amplificador com o LM386</span></span></h2>
<div class="MsoNoSpacing" style="text-align: justify;">
<br /></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";">A montagem do amplificador é feita em uma placa de circuito impresso. O layout é ilustrado na <i>figura 4</i> e pode ser baixado no link <a href="https://www.dropbox.com/s/d0xu0rnvuyreuuo/Projeto%20Amplificador%20LM386%20%5Bsenha%20www.eletronicaemcasa.blogspot.com.br%5D.rar?dl=0" target="_blank">Projeto Amplificador LM386</a>.</span></div>
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<br />
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgCitgOjE303HcJc5R6b-8v8FYdRdJm1BJLhbycgDI0gPYUTnfyqECwOZayRyWxs-LQm_TXXLcnVPqrETm4y0g2HpgijfLVecDdNwjAbOtQYbMMEfPMHGCtDOSXf9wDRXxwhNcD6oJAE7lU/s658/placa.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="http://eletronicaemcasa.blogspot.com.br/" border="0" height="185" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgCitgOjE303HcJc5R6b-8v8FYdRdJm1BJLhbycgDI0gPYUTnfyqECwOZayRyWxs-LQm_TXXLcnVPqrETm4y0g2HpgijfLVecDdNwjAbOtQYbMMEfPMHGCtDOSXf9wDRXxwhNcD6oJAE7lU/s400/placa.png" title="Amplificador de audio LM386" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 4 - placa de circuito impresso do amplificador LM386.</td></tr>
</tbody></table>
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<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";">O circuito completo do amplificador é apresentado na <i>figura 5</i>.</span><br />
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhEYz4u04pn7yR5gL6L8yt87k3YsF8MF-NQlxGYWrltXcq2PD2uaBnIibcs96566sqwHtHohfts7DdDyjUQJSsJinHQZrxnSlRQEoGcnyomtb0S3MJbQlF8GU0Tr-rjqHtsbuWwgeYQGMqC/s1600/circuito+diagrama_wm_wm.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Eletronica em Casa" border="0" height="305" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhEYz4u04pn7yR5gL6L8yt87k3YsF8MF-NQlxGYWrltXcq2PD2uaBnIibcs96566sqwHtHohfts7DdDyjUQJSsJinHQZrxnSlRQEoGcnyomtb0S3MJbQlF8GU0Tr-rjqHtsbuWwgeYQGMqC/s400/circuito+diagrama_wm_wm.jpg" title="Amplificador de audio com lm386" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><h3>
Figura 5 - Circuito elétrico do amplificador.</h3>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";">O circuito é alimentado por uma fonte de 9V através do conector X3. Na saída de som deve-se conectar um alto-falante de uso comum de impedância de 8 Ohms e potência mínima de 1W. O sinal de áudio pode ser proveniente de um mp3 player, celular ou até mesmo do computador. A <i>figura 6</i>, <i>7 e 8</i> ilustra a montagem final do circuito.</span><br />
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8lovA9JMVcptuTjHlLkydn9owLjBrmE3hy_9t9TXj6yJI4nlVRi7dGdEwVnGFechk0qCUPdsmEeNaxM9E0IhnFfzXyQVwHLzrdj3W7tzRW7vp_EEi_Mx_9G0bGGhTo0WW9PjhcDGh6xv_/s1600/montagem_wm.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Amplificador de baixa potência" border="0" height="300" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8lovA9JMVcptuTjHlLkydn9owLjBrmE3hy_9t9TXj6yJI4nlVRi7dGdEwVnGFechk0qCUPdsmEeNaxM9E0IhnFfzXyQVwHLzrdj3W7tzRW7vp_EEi_Mx_9G0bGGhTo0WW9PjhcDGh6xv_/s400/montagem_wm.jpg" title="Ampplificador de Audio com o LM386" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><h3>
Figura 6 - Esquema de montagem</h3>
</td></tr>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6vwVOUsDlbIDpN8GcnRHU3np53z27bSPJebFfknhkqH4c0Zd5s8zplznyiF4B7zi8ev52aXKsaY6A3yUetUMpC3QAukkFIud2RrC0TVmiM7z4Zb6llLFauVeCC0ay9QwwXJqcPvkJsFl3/s463/amplificador+LM386.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Amplificador de Audio http://eletronicaemcasa.blogspot.com.br/" border="0" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6vwVOUsDlbIDpN8GcnRHU3np53z27bSPJebFfknhkqH4c0Zd5s8zplznyiF4B7zi8ev52aXKsaY6A3yUetUMpC3QAukkFIud2RrC0TVmiM7z4Zb6llLFauVeCC0ay9QwwXJqcPvkJsFl3/s320/amplificador+LM386.png" title="Amplificador de Audio " width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><h3>
Figura 7 - Amplificador de áudio com LM386</h3>
</td></tr>
</tbody></table>
<br />
<br />
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj-JoVR5qXpVC2xunoTrI3m39Zeh5BwsU-OZRLoVqYhmiaccLtFspj4BNdVPf1Kj-l4K-BnaLHB0c_FEIiuxajRYH3DTT1eLFyQGpFc9ODylLpQ0egY6TnJ4MAM46zzor5oXQ7zK0d184k1/s1600/amplificador+LM386+2_wm.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="LM386" border="0" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj-JoVR5qXpVC2xunoTrI3m39Zeh5BwsU-OZRLoVqYhmiaccLtFspj4BNdVPf1Kj-l4K-BnaLHB0c_FEIiuxajRYH3DTT1eLFyQGpFc9ODylLpQ0egY6TnJ4MAM46zzor5oXQ7zK0d184k1/s400/amplificador+LM386+2_wm.jpg" title="Amplificador de áudio com LM386" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><h3 class="MsoNoSpacing">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";">Figura 8 - Amplificador de áudio com LM386</span></h3>
</td></tr>
</tbody></table>
<br />
<h2 class="MsoNoSpacing" style="text-align: left;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span style="font-size: large;">Lista de Componentes do Amplificador</span></span></h2>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><br /></span></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<h3>
<b><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Resistores</span></b></h3>
</div>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";">R1 - 1k2 Ohms 1/8W</span></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";">R2 - 10 Ohms 1/8W</span><br />
<span lang="PT-BR" style="font-family: "times new roman" , "serif";">P1 - Potenciômetro 10k Ohms </span></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<br /></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<h3>
<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><b>Capacitores</b> </span></h3>
</div>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";">C1 - 10uF/16v eletrolítico</span></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";">C2 - 220uF/16v eletrolítico</span></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";">C3 - 100uF/16v eletrolítico</span></div>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";">C4 - 100nF cerâmico</span></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";">C5 - 100nF cerâmico</span></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">C6 - 100nF cerâmico</span></span></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<br /></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<h3>
<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";"><b>Semicondutores</b> </span></span></h3>
</div>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">CI - LM386</span></span></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";"><br /></span></span></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<h3>
<b><span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Diversos</span></span></b></h3>
</div>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Placa de fenolitico.</span></span></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">3 Bornes de conexão 2 vias.</span></span></div>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Fios.</span></span></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Alto falante de 1W com 8 Ohms de impedância.</span></span></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Fonte de 9V.</span></span></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Plug P2 mono.</span></span></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span lang="PT-BR" style="font-family: "times new roman" , "serif";"> </span> </span></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<br />
Confiram também a versão estereofônica do amplificador com LM386 <span lang="PT-BR" style="font-family: "times new roman" , "serif";">(<a href="https://www.blogger.com/blogger.g?blogID=8832769654369184552#editor/target=post;postID=165178021145875584;onPublishedMenu=posts;onClosedMenu=posts;postNum=0;src=postname" target="_blank">Amplificador Estéreo com o LM386</a>).</span> <br />
<br /></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<br />
<div style="text-align: center;">
<span lang="PT-BR"><b>Confira o nosso Kit de Montagem Transmissor FM.</b></span></div>
<div style="text-align: center;">
<a href="http://www.eletronicaemcasa.blogspot.com.br/p/blog-page_20.html" rel="nofollow" target="_blank"><img border="0" height="165" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhObFf70zJ4H4hJxx3aCWkUEnNGB8qb2gejuRbXEeUlOdOzp-UtTi_fxd1IuekpAf1WkHuIkutUy41mua3DAnnJ8MGMNRuMjK3d_IE9RhkLJbEpVRizhteDTw-fYVLFdrOBaI2Reh9lFZeJ/s320/rzgzgrg.png" width="200" /></a><span lang="PT-BR"><b> </b></span></div>
<div style="text-align: center;">
<span lang="PT-BR"><b>Enviamos para todo o Brasil</b></span></div>
</div>
</div>
Guilhermehttp://www.blogger.com/profile/01893157551344267377noreply@blogger.com95Aracruz - Espírito Santo, Brésil-19.8189319 -40.273888800000009-20.297055399999998 -40.919335800000006 -19.3408084 -39.628441800000012tag:blogger.com,1999:blog-8832769654369184552.post-77578995222839772392013-06-04T22:24:00.008-03:002021-07-02T15:30:54.803-03:00 TEA5767 - Rádio FM com o PIC 16F876a<div dir="ltr" style="text-align: left;" trbidi="on">
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<![endif]--><span lang="PT-BR" style="font-family: "times new roman" , "serif";">O
circuito integrado TEA5767 é um rádio FM estéreo em um único chip. Esse CI é
ideal para pequenas aplicações com baixo consumo de energia e de baixa
complexidade uma vez que não é necessário nenhum tipo de ajuste no seu
circuito. Este chip pode se comunicar com circuitos externo via um barramento
I2C. Confira como funciona este dispositivo e como utilizá-lo para fazer um rádio
FM com o microcontrolador PIC16F876a.</span><br />
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<a name='more'></a><br />
<h2 style="text-align: left;">
<span style="font-family: inherit;"><span lang="PT-BR" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT-BR;"><span style="font-size: large;">Introdução </span></span></span></h2>
<br />
<span style="font-family: inherit;"><span lang="PT-BR" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT-BR;">O m</span><span lang="PT-BR" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT-BR;"><span lang="PT-BR" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT-BR;">ó</span>dulo </span><span lang="PT-BR" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT-BR;"><span lang="PT-BR" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT-BR;">de rádio FM</span> contem todos os blocos necessários para construir uma função
de rádio digitalmente sintonizável em um único chip. O chip TEA 5767 é
geralmente encontrado em forma de módulo como apresentado na <i>figura 1</i>. Esse
componente é facilmente achado em dispositivos portáteis como MP3, MP4 ou
celulares com função rádio. </span></span><br />
<table cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><span style="font-family: inherit;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgrI6FhRBGgj2GHTIvrdXM7_uP39usgPvF7F6pFNVItHHXFPsI1kA-9oYpWFn3dTpdzX8YSrDIq6em3AKAEOZu7QKyoO9wrdu1jMFetckXzTqAKlMQC3ytqq_zNczOouqr3i5pU9RORFxYn/s1600/images.jpg" style="margin-left: auto; margin-right: auto;"><img alt="Radio FM com o PIC" border="0" height="150" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgrI6FhRBGgj2GHTIvrdXM7_uP39usgPvF7F6pFNVItHHXFPsI1kA-9oYpWFn3dTpdzX8YSrDIq6em3AKAEOZu7QKyoO9wrdu1jMFetckXzTqAKlMQC3ytqq_zNczOouqr3i5pU9RORFxYn/s200/images.jpg" title="Ligação do modulo TEA5767/68 com o PIC" width="200" /></a></span></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: inherit;">Figura 1 - M<span lang="PT-BR" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT-BR;">ó</span>dulo de <span lang="PT-BR" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT-BR;">rádio FM TEA5767 encontrado em dispositivos m</span><span lang="PT-BR" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT-BR;"><span lang="PT-BR" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT-BR;">ó</span>veis</span></span></td></tr>
</tbody></table>
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<br />
<h2 style="text-align: left;">
<span style="font-family: inherit; font-size: large;"><span lang="PT-BR" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT-BR;">Descrição
do m</span><span lang="PT-BR" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT-BR;"><span lang="PT-BR" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT-BR;">ó</span>dulo TEA5767</span></span></h2>
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<span style="font-family: inherit;"><br /></span></div>
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<span style="font-family: inherit;"><span lang="PT-BR" style="font-family: "times new roman" , "serif"; font-size: 11pt; line-height: 115%;">O módulo possui 10
pinos como ilustrado na <i>figura 2</i> e é comandado via um barramento I2C quando o
Busmode (Pino 3) é colocado em nível baixo. A interface serial I2C usa o pino 1
para SDA (via de dados) e o pino 2 para SCL (Clock). O sistema é alimentado no
pino 5 (VCC) com tensão entre 2,5V a 5V e o pino 6 é o GND . Os pinos 7 e 8
são as saídas de áudio estéreo e o pino 10 é a antena para entrada de RF. </span></span></div>
<div style="text-align: justify;">
<span style="font-family: inherit;"><br /></span></div>
<table cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><span style="font-family: inherit;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8m1ZWD2Neyd8EpCRLbddZFkrvFSA1qrxEBMYBTFoUxuxNEy-7px5N3aZ-44dmOPLL-rMvV2_sP_5TQxqCg0fIkcEYCJ7UiUuqQDvErps3O_wsXncbeZZ5Wm-eNGMeGaxA8rNnH-wCoR_W/s1600/pinos+de+liga%C3%A7%C3%A3o.png" style="margin-left: auto; margin-right: auto;"><img alt="Ligação do modulo TEA5767/68 com o PIC" border="0" height="255" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8m1ZWD2Neyd8EpCRLbddZFkrvFSA1qrxEBMYBTFoUxuxNEy-7px5N3aZ-44dmOPLL-rMvV2_sP_5TQxqCg0fIkcEYCJ7UiUuqQDvErps3O_wsXncbeZZ5Wm-eNGMeGaxA8rNnH-wCoR_W/s400/pinos+de+liga%C3%A7%C3%A3o.png" title="Receptor de Radio FM TEA5767/68" width="400" /></a></span></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: inherit;">Figura 2 - Ligação do TEA5767</span></td></tr>
</tbody></table>
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<span style="font-family: inherit;"><span lang="PT-BR" style="font-family: "times new roman" , "serif"; font-size: 12pt; line-height: 115%;">Receptor </span><span lang="PT-BR" style="font-family: "times new roman" , "serif"; font-size: 12pt; line-height: 115%;"><span lang="PT-BR" style="font-family: "times new roman" , "serif"; font-size: 12pt; line-height: 115%;">super-heteródino</span> </span></span></h3>
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<span style="font-family: inherit;"><span lang="PT-BR" style="font-family: "times new roman" , "serif"; font-size: 12pt; line-height: 115%;">Inicialmente de
comandarmos o circuito é interessante entendermos a idéia de funcionamento de
um receptor super-heteródino que é usado nesse componente em questão. </span></span></div>
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<span style="font-family: inherit;"><span lang="PT-BR" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT-BR;">O receptor Super-heteródino (<i>figura 3</i>) foi inventado em 1918 por Edwin
Armstrong. O princípio de funcionamento, que ainda hoje se aplica aos mais
modernos aparelhos de rádio, constituiu o maior salto na evolução das
radiocomunicações uma vez que permitiu resolver alguns graves problemas que os
receptores da época tinham: fraca estabilidade, pouca seletividade e grande sensibilidade
às interferências.</span></span></div>
<span style="font-family: inherit;"><br /></span>
<br />
<table cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><span style="font-family: inherit;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh2qEJGDX9r5Eb4UJujwsHcnNbBfX2Zi22WCr93cYjCyDitD94UwtITwbtekWypuBmjbmCvPnrhk4GIogPNWc6BZOO-wdGSgG4eddYgSciB0n5atfbNWbhAuYI865FK4kt4TtlK5__-o7Qd/s1600/receptor+heterodino.png" style="margin-left: auto; margin-right: auto;"><img alt="TEA5757 + PIC16f876" border="0" height="172" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh2qEJGDX9r5Eb4UJujwsHcnNbBfX2Zi22WCr93cYjCyDitD94UwtITwbtekWypuBmjbmCvPnrhk4GIogPNWc6BZOO-wdGSgG4eddYgSciB0n5atfbNWbhAuYI865FK4kt4TtlK5__-o7Qd/s640/receptor+heterodino.png" title="Receptor super-heterodino TEA5757" width="640" /></a></span></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: inherit;">Figura 3 - Diagrama de Bloco simplificado de um receptor super-heteródino.</span></td></tr>
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<style>
/* Style Definitions */
table.MsoNormalTable
{mso-style-name:"Tableau Normal";
mso-tstyle-rowband-size:0;
mso-tstyle-colband-size:0;
mso-style-noshow:yes;
mso-style-priority:99;
mso-style-qformat:yes;
mso-style-parent:"";
mso-padding-alt:0cm 5.4pt 0cm 5.4pt;
mso-para-margin-top:0cm;
mso-para-margin-right:0cm;
mso-para-margin-bottom:10.0pt;
mso-para-margin-left:0cm;
line-height:115%;
mso-pagination:widow-orphan;
font-size:11.0pt;
font-family:"Calibri","sans-serif";
mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;
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<![endif]--><span lang="PT-BR" style="font-family: "times new roman" , "serif"; font-size: 11pt; line-height: 115%;">No receptor super-heteródino uma onda de rádio
com frequência F<i>rf</i>, captada pela antena, é amplificada e levada ao bloco
misturador que é um elemento não linear. No bloco misturador a onda de
radiofrequência é misturada com outra onda que é gerada em um oscilador do
próprio receptor, chamado de oscilador local. A frequência do oscilador local,
na grande maioria dos sintonizadores é sempre 10,7MHz, chamada de frequência
intermediária FI.</span></div>
</div>
<div style="line-height: 115%; text-align: justify;">
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";">De
forma resumida o misturador recebe <b><i>x+y</i></b>, e efetua <b><i>(x+y)<sup>2
</sup>= x<sup>2 </sup>+ y<sup>2 </sup>+ 2xy</i></b>. O termo <b><i>2xy</i></b>
é o responsável pela conversão de frequência, pois corresponde ao produto de
duas funções senoidais (identidade trigonométrica <i>sen(x)sen(y)=[cos(x-y)-cos(x+y)]/2</i>
) esse produto resulta em dois novos sinais com frequência <b>soma: F<i>rf</i>+Fo</b>
e frequência <b>diferença: F<i>rf</i>-Fo</b> e é um desses dois sinais que nos
interessa. Esse sinal é escolhido como sinal de FI (frequência intermediária)
por meio de um filtro (<i>figura 4</i>) adequado de<b> </b>FI.</span></div>
<br />
<table cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><span style="font-family: inherit;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjkKvsIPpZXROwDFuF-bSkYp3wWDNol2VS2T8pjkYWdpAy2BusY_G1gkJKCvC1dw0xlZNQ-bZOI4eJBbDK7oAalUFm82XCNaZgUtAUMoG4F5v6TeRIwW7lkt0yoTUrH-w0v2Ey77Lllkinp/s1600/convf3.GIF" style="margin-left: auto; margin-right: auto;"><img alt="tea5767 + PIC" border="0" height="170" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjkKvsIPpZXROwDFuF-bSkYp3wWDNol2VS2T8pjkYWdpAy2BusY_G1gkJKCvC1dw0xlZNQ-bZOI4eJBbDK7oAalUFm82XCNaZgUtAUMoG4F5v6TeRIwW7lkt0yoTUrH-w0v2Ey77Lllkinp/s400/convf3.GIF" title="Receptor super-heterodino" width="400" /></a></span></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: inherit;">Figura 4 - Funcionamento receptor super-heteródino. </span></td></tr>
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<span style="font-family: inherit;"><span lang="PT-BR" style="font-size: 11pt; mso-ansi-language: PT-BR;">Para que
todo esse processo? Imaginemos uma frequência de sintonia do rádio FM escolhida
de 97,7MHz. </span></span><br />
<span style="font-family: inherit;"><span lang="PT-BR" style="font-size: 11pt; mso-ansi-language: PT-BR;">No final
do bloco misturador teremos várias frequências espalhadas espectralmente
entorno da frequência central de 97,7MHz, porém as duas mais importantes
são a soma e a diferença das frequências F<i>rf</i> e FI, ou seja, 108,4MHz e
10,7MHz. A frequência de 108,4MHz é então eliminada pelo filtro e a frequência
de 10,7MHz é amplificada e detectada.</span></span><br />
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<span lang="PT-BR" style="font-size: 11pt; line-height: 115%; mso-ansi-language: PT-BR;">Para a frequência de 97,7MHz e uma
frequência local de oscilação de 10,7MHz teremos:</span></div>
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<span lang="PT-BR" style="mso-ansi-language: PT-BR;">E se nós pegarmos a Banda
lateral inferior?</span><br />
<br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0hW7s1DH2XIN-r4DY4i8y9wlk8Az838GDKWKLbFg0ndSTwd_P-OFecwwvO0GC5uqsWBZWA8qTW_rG9BFnjdoq75Cx2icn8wwAeZak0nAW81nU__zYO9Gs6ClWZF8a2VoFtCziDroxMSwu/s1600/eq4.png" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="18" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0hW7s1DH2XIN-r4DY4i8y9wlk8Az838GDKWKLbFg0ndSTwd_P-OFecwwvO0GC5uqsWBZWA8qTW_rG9BFnjdoq75Cx2icn8wwAeZak0nAW81nU__zYO9Gs6ClWZF8a2VoFtCziDroxMSwu/s640/eq4.png" width="640" /></a><span lang="PT-BR" style="font-family: "times new roman" , "serif"; font-size: 11pt; line-height: 115%;"> </span><br />
<span lang="PT-BR" style="font-family: "times new roman" , "serif"; font-size: 11pt; line-height: 115%;">Novamente fazemos o procedimento anterior: </span><br />
<span lang="PT-BR" style="font-family: "times new roman" , "serif"; font-size: 11pt; line-height: 115%;"><br /></span></div>
<div style="line-height: 115%;">
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh7sFDQQXSv75chyen-qQa0R7Bfi7A99tckQ_ogwV-1ssmxJhUrVkAKMLlIKpMN5P3weNTKna_hjZ3W1K5gJcxmml28oBpC03G2LZY68ABMAlBbPVcF7OOi5eReZtTI5IPbtsXydYLWdyQj/s1600/eq3.png" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="42" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh7sFDQQXSv75chyen-qQa0R7Bfi7A99tckQ_ogwV-1ssmxJhUrVkAKMLlIKpMN5P3weNTKna_hjZ3W1K5gJcxmml28oBpC03G2LZY68ABMAlBbPVcF7OOi5eReZtTI5IPbtsXydYLWdyQj/s640/eq3.png" width="640" /></a></div>
<br />
<span style="font-family: inherit;"><span style="font-family: inherit;"><span style="font-family: inherit;"><span style="font-size: small;"><span lang="PT-BR" style="font-family: "times new roman" , "serif"; font-size: 11pt; line-height: 115%;"><span lang="PT-BR" style="font-family: "times new roman" , "serif"; font-size: 12pt; line-height: 115%;">Para
que todo esse procedimento? Amplificar uma frequência de 97,7MHz é mais
complicada do que amplificar uma frequência de 10,7MHz por isso temos essa
conversão de espectro. Em resumo o sinal de áudio modulado na frequência de
97,7MHz é transferido para uma frequência mais baixa para ser <span style="font-family: inherit;">amplificado e
detectado mais facilmente e minimizando os efeitos indesejáveis. Entretanto o
CI TEA5767 utiliza uma frequência intermediária </span>(FI) de 225KHz ao invés de
10,7MHz.</span></span></span></span></span></span></div>
</div>
<div style="text-align: justify;">
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</div>
<h3 class="MsoNormal" style="text-align: left;">
<span style="font-family: inherit;">Demodulação</span></h3>
<div class="MsoNormal">
<div class="MsoNormal" style="text-align: justify;">
<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><span style="font-size: small;">Nos </span>sistemas osciladores de RF a
sintonia é feita por intermédio de um capacitor variável ou por um diodo
varicap. Os sistemas de sintonia digitais substituem os convencionais
receptores AM e FM. O sintonizador digital é feito com um PLL (Phase Locked
Loop). O PLL é usado para sintetizar a comunicação dos receptores e
transmissores, ele necessita de uma frequência de referencia de baixa
frequência. O Modulo TEA5767 usa um cristal de 32,768Khz para isso. A
demodulação FM é mostrada de forma ilustrativa na <i>figura 5.</i></span></div>
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<span style="font-family: inherit;"><br /></span></div>
<table cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><span style="font-family: inherit;"><img alt="TEA5767 + PIC" border="0" height="95" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEir0LQGH0F9EFMR5cO0nnP4cL2qUBV4vVsaA2NnEf9EocDcCGSRHqF1kwli67eC94T0-fgn4Z4idN5q2LcegxN4bZPIDaHY0qJP4aX8mDr2Ap3pgA20MNzMeGBV6wd-cyeQm7nF84HJXo60/s400/demodula%C3%A7ao.png" style="margin-left: auto; margin-right: auto;" title="Demodulação PLL TEA5767" width="400" /></span></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: inherit;">Figura 5 - Demodulação FM com PLL.</span></td></tr>
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<br />
<div class="MsoNoSpacing">
<span style="font-family: inherit;"><span lang="PT-BR" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT-BR;">O
circuito PLL funciona a partir de um oscilador de referencia sintonizado em uma
frequência fo. O PLL recebe em sua entrada um sinal com uma frequência fc. O
circuito compara então a frequência e a fase do sinal recebido com a frequência
e a fase do oscilador de referencia (32768KHz no caso do TEA5767).<span style="mso-spacerun: yes;"> </span>Se forem iguais,
a saída do circuito é nula. Se a frequência fc for maior que fo, então o
circuito fornece na saída uma tensão positiva proporcional à diferença entre as
frequências. Se a frequência fc for menor que fo, então o circuito fornece na
saída uma tensão negativa proporcional à diferença entre as frequências.
Resumidamente, o<span style="mso-spacerun: yes;"> </span>PLL<span style="mso-spacerun: yes;"> </span>fornece<span style="mso-spacerun: yes;">
</span>uma<span style="mso-spacerun: yes;"> </span>tensão<span style="mso-spacerun: yes;"> </span>proporcional<span style="mso-spacerun: yes;">
</span>ao<span style="mso-spacerun: yes;"> </span>desvio<span style="mso-spacerun: yes;"> </span>de<span style="mso-spacerun: yes;">
</span>frequência<span style="mso-spacerun: yes;"> </span>a partir da frequência
do oscilador local, que é, em princípio, o processo inverso da modulação a partir
de um VCO. Modificando o valor<span style="mso-spacerun: yes;"> </span>da<span style="mso-spacerun: yes;"> </span>frequência<span style="mso-spacerun: yes;">
</span>fo,<span style="mso-spacerun: yes;"> </span>é<span style="mso-spacerun: yes;"> </span>possível<span style="mso-spacerun: yes;">
</span>demodular<span style="mso-spacerun: yes;"> </span>sinais<span style="mso-spacerun: yes;"> </span>com<span style="mso-spacerun: yes;">
</span>diferentes portadoras<span style="mso-spacerun: yes;"> </span>ou<span style="mso-spacerun: yes;"> </span>estações,<span style="mso-spacerun: yes;">
</span>visto<span style="mso-spacerun: yes;"> </span>que<span style="mso-spacerun: yes;"> </span>os<span style="mso-spacerun: yes;">
</span>desvios<span style="mso-spacerun: yes;"> </span>serão<span style="mso-spacerun: yes;"> </span>agora<span style="mso-spacerun: yes;">
</span>comparados<span style="mso-spacerun: yes;"> </span>a<span style="mso-spacerun: yes;"> </span>partir<span style="mso-spacerun: yes;">
</span>da<span style="mso-spacerun: yes;"> </span>nova frequência fo que no caso
do CI TEA5767 pode ser ajustada digitalmente através de um registrador de
14bits. </span></span>
<span style="font-family: inherit;"><br /></span></div>
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<div style="text-align: justify;">
<h2 style="text-align: left;">
<span style="font-family: inherit;">
<span style="font-size: large;">Configurando o modulo TEA5767 com o PIC16F876a</span></span></h2>
<span style="font-family: inherit;"><br /></span>
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<span style="font-family: inherit;"><span class="hps"><span lang="PT" style="mso-ansi-language: PT;"><span lang="PT" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT;">O TEA5767HN pode se comunicar
com o controlador externo através de uma interface serial. O sintonizador suporta
interface de barramento I2C e 3-WIRE, selecionável através do pino BUSMODE.
Quando o pino BUSMODE é levado para estado baixo o barramento de comunicação é
I2C mas quando em estado alto funciona no modo 3-WIRE. Uma aplicação típica de
interface I2C é dado na <i>figura 6</i>.</span></span></span></span><br />
<br />
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjuxkwgOIFLc-Iq1LlE2zNuDNsj6IQJ9MSrqnXD0BEuxm8zLMJ9JeQbeqEoBG05ru7kHmKJNJdT9KPK7TrLKiwxPrhGiBzoMp1gXSy_vM5FUoxxhPuoNIzLEs1GvJBlaH27p_hvbX-rkPE_/s1600/IC2_wm.jpg" style="margin-left: auto; margin-right: auto;"><img alt="Ligação do modulo TEA5767/68 com o PIC" border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjuxkwgOIFLc-Iq1LlE2zNuDNsj6IQJ9MSrqnXD0BEuxm8zLMJ9JeQbeqEoBG05ru7kHmKJNJdT9KPK7TrLKiwxPrhGiBzoMp1gXSy_vM5FUoxxhPuoNIzLEs1GvJBlaH27p_hvbX-rkPE_/s320/IC2_wm.jpg" title="Receptor de Radio FM TEA5767/68" width="293" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: inherit;">Figura 6 - Comunicação I2C.</span></td></tr>
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<div class="MsoNoSpacing">
<span lang="PT" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT;">Para estabelecermos uma comunicação serial com o módulo
de rádio utilizaremos um microcontrolador PIC16F876a. Esse microcontrolador
possui internamente um periférico de comunicação que suporta o protocolo I2C e
é facilmente encontrado no mercado com preços acessíveis. </span></div>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><br />
</span><span lang="PT" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT;">Estabelecer a comunicação entre o microcontrolador PIC e o módulo é
relativamente simples se os comandos forem dados corretamente.</span><span lang="PT-BR" style="font-family: "times new roman" , "serif";"></span></div>
<div class="MsoNoSpacing">
<span lang="PT" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT;">O módulo TEA5767 pode ser lido e escrito, porem neste
artigo vamos somente descrever o processo básico de escrita no módulo para
operá-lo de forma simples. O programa apresentado a seguir pode servir como
base para novas aplicações. </span><span lang="PT-BR" style="font-family: "times new roman" , "serif";"></span></div>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><br />
</span><span lang="PT" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT;">Em artigos futuras apresentarei outros projetos com o TEA5767!</span><span lang="PT-BR" style="font-family: "times new roman" , "serif";"></span></div>
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<h3 style="text-align: left;">
<span style="font-family: inherit;"><span lang="PT" style="mso-ansi-language: PT;">Escrita no Barramento I2C</span></span></h3>
<br /></div>
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<br />
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT;">I2C é uma
interface de barramento bidirecional simples. O barramento requer apenas duas
linhas, que são dados seriais (SDA) e o clock (SCL). O barramento é de 8 bits
orientado serialmente. Cada dispositivo é reconhecida com um único endereço. O
barramento I2C funciona com uma frequência máxima de 400KHz. </span><span lang="PT-BR" style="font-family: "times new roman" , "serif";"></span></div>
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<br /></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT;">A
transferência de bytes de dados devem ser ordenados do menor para o maior. A
sequencia de transferência dos dados para o modulo é a seguinte: <b>Endereço</b>,
<b>Byte1</b>, <b>Byte2</b>, <b>Byte3</b>, <b>Byte4</b> e <b>Byte5</b> (A
sequencia dever ser necessariamente nessa ordem como apresentado na <i>figura 7</i>).
</span><span lang="PT-BR" style="font-family: "times new roman" , "serif";"></span></div>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><br />
</span><span lang="PT" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT;">O MSB de cada byte será enviado em primeiro lugar. O endereço IC do TEA5767
é 0b1100000. Isto significa que o primeiro byte a ser transmitido para o
TEA5767HN deve ser "0xC0" para uma operação de escrita (caso abordado
neste artigo) ou "0xC1" para a operação de leitura.</span><span lang="PT-BR" style="font-family: "times new roman" , "serif";"></span></div>
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<table cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><span style="font-family: inherit;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjGpCu3P5PkLhBXyGR6IKeo-W_ZA_5XNkN5FG_bwaNjy_sVORsTSfiOBsvhqv02AthNnsrFhOALZ5AUx7d21JR5xXRL8Qyp47gdNlSc5fFXC7litmgteOb4OdwYClLqV1W04yZj4xlevU8E/s1600/escrita+byte.png" style="margin-left: auto; margin-right: auto;"><img alt="PIC16F876 + TEA5757/58" border="0" height="75" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjGpCu3P5PkLhBXyGR6IKeo-W_ZA_5XNkN5FG_bwaNjy_sVORsTSfiOBsvhqv02AthNnsrFhOALZ5AUx7d21JR5xXRL8Qyp47gdNlSc5fFXC7litmgteOb4OdwYClLqV1W04yZj4xlevU8E/s640/escrita+byte.png" title="Modulo TEA5767/68" width="640" /></a></span></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: inherit;">Figura 7 - Sequencia de comando de escrita no TEA5767.</span></td></tr>
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<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT;">Portanto
após enviarmos o Byte de Endereço devemos enviar os 5 bytes subsequentes. Nas
tabelas a baixo temos a sequencia de bytes que devêm ser enviados para a
operação de escrita básica.</span><span lang="PT-BR" style="font-family: "times new roman" , "serif";"></span></div>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";"><br />
</span><span lang="PT" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT;">Para sintonizar o rádio na frequência desejada, deve-se em primeiro lugar
calcular a variável do registrador PLL correspondente. Está variável é uma
palavra de 14bits que vai ser enviada para o divisor programável do PLL.
Podemos escolher entre o sinal contido na banda lateral inferior ou superior.
Em contraste com a maioria dos sistemas que utilizam um sintonizador
super-heteródino com FI de 10.7MHz, o TEA5767/68 usa uma baixa FI de 225KHz.
Com esta baixa FI, integração do FI filtro torna-se viável. O objetivo é
reduzir os custos do sistema e da potência global.</span><span lang="PT-BR" style="font-family: "times new roman" , "serif";"></span></div>
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<br /></div>
<div class="MsoNoSpacing" style="text-align: justify;">
<span lang="PT" style="font-family: "times new roman" , "serif"; mso-ansi-language: PT;">A formula
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dito anteriormente o valor desse registrador é de 14Bits, portanto a variável é
enviada ao registrador por dois bytes seguidos, o primeiro (Byte1) contêm os
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjZKdyO4U4sCzvcl2rMhh2OZzTy8YvzOVCsmot8vmkNNdqz618iCN6mvLtfbso5Jjg11Ez8PYl8BNmCV4ZTjx6BXr4K5rRxTRfebI5G2AAfVRJGHtXo0FKnCa4WjeQ6fyz_tHdZbRKQGJtT/s1600/calculo+freq_wm_wm.jpg" style="margin-left: auto; margin-right: auto;"><img alt="Calculo de banda lateral superior Radio FM com o PIC" border="0" height="179" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjZKdyO4U4sCzvcl2rMhh2OZzTy8YvzOVCsmot8vmkNNdqz618iCN6mvLtfbso5Jjg11Ez8PYl8BNmCV4ZTjx6BXr4K5rRxTRfebI5G2AAfVRJGHtXo0FKnCa4WjeQ6fyz_tHdZbRKQGJtT/s320/calculo+freq_wm_wm.jpg" title="Receptor de Radio FM TEA5767/68 e PIC16F876" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: inherit;">Figura 8 - Formula para o calculo da frequência de sintonia.</span></td></tr>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";">A frequência que eu escolhi para
sintonizar uma estação no </span><span lang="PT-BR" style="font-family: "times new roman" , "serif";"><!--[if gte mso 9]><xml>
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9</i> chegamos ao resultado a baixo.</span><br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj5vaNtLswvxAdOjCKxU_Wyv7e29cdMrpmNSIgwoY2KPjUbQqtTB1FR0-xHb7YYTvOkErCaUoCE0nbcxBASsckvEXeYFadZHbqZGDY3WnmhtRi5hK3H5nkA7pNrCj1f91brEeNHLJaGbIfd/s1600/calculo_wm_wm.jpg" style="margin-left: auto; margin-right: auto;"><img alt="Banda Lateral superior Radio FM com PIC16f876" border="0" height="175" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj5vaNtLswvxAdOjCKxU_Wyv7e29cdMrpmNSIgwoY2KPjUbQqtTB1FR0-xHb7YYTvOkErCaUoCE0nbcxBASsckvEXeYFadZHbqZGDY3WnmhtRi5hK3H5nkA7pNrCj1f91brEeNHLJaGbIfd/s400/calculo_wm_wm.jpg" title="Receptor de Radio FM TEA5767/68" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: inherit;">Figura 9 - Calculo da frequência de sintonia com a banda lateral superior.</span></td></tr>
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<![endif]--><span lang="PT-BR" style="font-family: "times new roman" , "serif";">Enviando o Byte1 ao módulo
(Tabela 1). O Bit MUTE e SM são deixado em <i>0</i> sendo necessário enviar
somente os 6bits dos registradores PLL (0x2F).</span><br />
<br />
<div style="text-align: center;">
<span style="font-family: inherit;">Tabela 1</span><br />
<div class="separator" style="clear: both; text-align: center;">
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<br />
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";">Enviando o Byte 2 ao módulo
(Tabela 2). Corresponde ao 8bits restantes do registrador PLL (0xD7).</span></div>
<br />
<div style="text-align: center;">
<span style="font-family: inherit;">Tabela 2</span><br />
<div class="separator" style="clear: both; text-align: center;">
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";">Enviando
o Byte 3 ao módulo (Tabela 3). Configuração do modo de busca (SUD,SSL[1,0]) e
escolhemos a banda lateral superior para a demodulação (HLSI).</span></div>
<span style="font-family: inherit;"><br /></span>
<br />
<div style="text-align: center;">
<span style="font-family: inherit;">Tabela 3</span><br />
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhnNsbomoveuydzRlUBWpie1lkOX_FIwLnMsCbQoqC6rVHzXxkZ4LA5T7gaDoYQHEx8KiGS7_g4G4GiV39Vj7DRjoMnYTvYkyZtJk-YXDsqe_e4tDsgA71X5zPVlzb40pFulBAAbESJnagq/s1600/byte3_wm.jpg" style="margin-left: 1em; margin-right: 1em;"><img alt="Radio FM com o PIC16F876" border="0" height="116" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhnNsbomoveuydzRlUBWpie1lkOX_FIwLnMsCbQoqC6rVHzXxkZ4LA5T7gaDoYQHEx8KiGS7_g4G4GiV39Vj7DRjoMnYTvYkyZtJk-YXDsqe_e4tDsgA71X5zPVlzb40pFulBAAbESJnagq/s200/byte3_wm.jpg" title="Receptor de Radio FM TEA5767/68" width="200" /></a></div>
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<span lang="PT-BR" style="font-family: "times new roman" , "serif";">Enviando
o Byte 4 ao módulo (Tabela 4). Configuração da frequência de oscilação de
referencia do PLL (XTAL).</span></div>
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<span style="font-family: inherit;">Tabela 4</span><br />
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<span style="font-family: inherit;"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">E
por último enviamos o Byte 5 ao módulo (Tabela 5). Configuração da frequência
de oscilação de referencia do PLL (PLLREF). </span></span></div>
<span style="font-family: inherit;">
</span><br />
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<span style="font-family: inherit;">Tabela 5</span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjNcnIA6seoYReveJZCo6wq5nl0qO0iZLurQ07whuck5m3K0FXRj8cgFij0hW0MmqUcjrxP5JavSdf4FDQOqzADMrIKtyiRm8vj7D8s-Q_SuN9SWiHRb7utIGIbmERh1j_0LtCi3M5ixAHW/s1600/byte5_wm.jpg" style="margin-left: 1em; margin-right: 1em;"><img alt="Radio FM com o PIC16F876" border="0" height="116" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjNcnIA6seoYReveJZCo6wq5nl0qO0iZLurQ07whuck5m3K0FXRj8cgFij0hW0MmqUcjrxP5JavSdf4FDQOqzADMrIKtyiRm8vj7D8s-Q_SuN9SWiHRb7utIGIbmERh1j_0LtCi3M5ixAHW/s200/byte5_wm.jpg" title="Receptor de Radio FM TEA5767/68" width="200" /></a></div>
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<br />
<span style="font-family: inherit;"><span lang="PT-BR" style="font-family: "times new roman" , "serif";">A
baixo temos uma parte do código básico para configurar o módulo com o
microcontrolador PIC16F876a por intermédio do barramento I2C. O programa foi
desenvolvido com o compilador <b>CCS </b>e o arquivo completo pode ser baixado no
link:</span>
<a href="http://db.tt/MgYyaDy0" target="_blank">Radio.c</a></span></div>
<br />
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgeS0I9vWpugfKFc6I_HKIBnLXBM2XgivkDlXcTK2QCLApR58q5jZhQDw8mbadSqHMYD3My3lr1lY_DUehzKj8B0HWLhFWN-iT7vz42Nh02JHdI9_glPAXMbKv6NgTFXr2s1PdjmOTnggUF/s1600/programa_wm.jpg" style="margin-left: 1em; margin-right: 1em;"><img alt="Radio FM com o PIC" border="0" height="334" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgeS0I9vWpugfKFc6I_HKIBnLXBM2XgivkDlXcTK2QCLApR58q5jZhQDw8mbadSqHMYD3My3lr1lY_DUehzKj8B0HWLhFWN-iT7vz42Nh02JHdI9_glPAXMbKv6NgTFXr2s1PdjmOTnggUF/s640/programa_wm.jpg" title="Receptor de Radio FM TEA5767/68 com PIC" width="640" /></a></div>
<br />
<br />
<h2>
Circuito e Montagem do Receptor de Rádio </h2>
<span style="font-family: inherit;"><br /></span></div>
<div style="text-align: justify;">
<div style="text-align: justify;">
<span style="font-family: inherit;">O circuito elétrico de ligação é apresentado na<i> figura 10</i>. Caixinhas de som do computador poderão ser usadas como amplificador de áudio. </span></div>
<div style="text-align: justify;">
<span style="font-family: inherit;"><br /></span>
<br />
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhp71bh06c2SHHzDb4rZNWbhkCSql8ns2tKX5b8X2oGwxmWJCzdmqdRzckOn6msy7AkwWsYBtFsfwbMOG_dLMIDePvIC9vRwo7ts21KYN5wNfIDLAtYqTEPH-AIaJWqmkQq8zrzWtIUasRb/s1600/circuito2_wm.jpg" style="margin-left: auto; margin-right: auto;"><img alt="TEA5767 + PIC" border="0" height="374" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhp71bh06c2SHHzDb4rZNWbhkCSql8ns2tKX5b8X2oGwxmWJCzdmqdRzckOn6msy7AkwWsYBtFsfwbMOG_dLMIDePvIC9vRwo7ts21KYN5wNfIDLAtYqTEPH-AIaJWqmkQq8zrzWtIUasRb/s640/circuito2_wm.jpg" title="Receptor de Radio FM TEA5767/68" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: inherit;">Figura 10 - Circuito elétrico para montagem.</span></td></tr>
</tbody></table>
</div>
<div class="separator" style="clear: both; text-align: center;">
</div>
<div style="text-align: justify;">
</div>
</div>
<div style="text-align: justify;">
<div style="text-align: justify;">
<br />
<span style="font-family: inherit;">Na <i>figura 11</i> temos o circuito montado em protoboard.</span></div>
<div style="text-align: justify;">
<span style="font-family: inherit;"><br /></span>
<br />
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhTwqBeKoHqpIvWvNN_zP8saOvoJ06xdGvzWIJir5FGHM77Y3_keHJMDbQOQoEyX_C6G0IkmQwuMZ-Iz7tkvbbTZlDeMc0BDgLRxiP3q6qcFKD8rWW4BsIIReLHXKyxQ1U_l6LGFYrZhlHu/s668/montagem2.jpg" style="margin-left: auto; margin-right: auto;"><img alt="TEA5767/68 + PIC" border="0" height="356" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhTwqBeKoHqpIvWvNN_zP8saOvoJ06xdGvzWIJir5FGHM77Y3_keHJMDbQOQoEyX_C6G0IkmQwuMZ-Iz7tkvbbTZlDeMc0BDgLRxiP3q6qcFKD8rWW4BsIIReLHXKyxQ1U_l6LGFYrZhlHu/s400/montagem2.jpg" title="Receptor de Radio FM TEA5767/68" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: inherit;">Figura 11 - Montagem do circuito em protoboard.</span></td></tr>
</tbody></table>
<span style="font-family: inherit;"><br /></span></div>
<div class="separator" style="clear: both; text-align: center;">
</div>
<div style="text-align: justify;">
<span lang="PT-BR" style="mso-ansi-language: PT-BR;">Maiores
informações sobre o receptor de rádio e sua configuração podem ser obtidas no
datasheet e no application note do TEA5767. O módulo oferece muitos outros
recursos que podem ser explorados.</span></div>
<div style="text-align: justify;">
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<![endif]--><span lang="PT-BR" style="font-family: "times new roman" , "serif"; font-size: 11pt; line-height: 115%;">Em breve estarei postando um outro trabalho mais
elaborado com esse pequeno receptor de rádio FM! </span></div>
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Arquivos:</span></h3>
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<span style="font-family: inherit;">Datasheet: <a href="https://www.dropbox.com/s/ol148r7bs0xiqbp/TEA5767.pdf?dl=0" target="_blank">TEA5767</a></span></div>
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<span style="font-family: inherit;">Application: <a href="https://www.dropbox.com/s/nuu4lh1kevpc7kr/application_note_tea5767-8.pdf?dl=0" target="_blank">TEA5767</a></span></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">Versão 1 : Sem LCD</div>
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<span style="font-family: inherit;"><span> </span><span> </span><span> </span><span> </span><span> </span>Codigo fonte: <a href="https://www.dropbox.com/s/5v31ovklgif9nb4/Radio_v1.c?dl=0" target="_blank">Radio.c</a></span><br />
<span style="font-family: inherit;"><span> </span><span> </span><span> </span><span> </span><span> </span>Arquivo .hex: <a href="https://www.dropbox.com/s/drbzpv0t872j3ih/Radio_v1.hex?dl=0" target="_blank">Radio.hex</a> </span></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">Versão 2 : Com LCD</div><div style="text-align: justify;"><span> Codigo fonte: <a href="https://www.dropbox.com/s/r043slu0ne5p65w/RADIO.c?dl=0" target="_blank">Radio.c</a></span></div><div style="text-align: justify;"><span> </span><span> </span><span> </span><span> </span><span> </span><span> </span><span> </span><span> </span><span> </span><span> </span><span> <a href="https://www.dropbox.com/s/hnlzy16i4tqpoar/mod_lcd.c?dl=0" target="_blank">Modulo_LCD</a></span><br /><span> Arquivo .hex: <a href="https://www.dropbox.com/s/4qmhv0oku00bxbg/RADIO.hex?dl=0" target="_blank">Radio.hex</a></span></div><div><span> </span><span> </span><span> </span><span> </span><span> Obs : As conexões entre LCD, PIC et TEA5767 devem ser deduzidas pelo</span> códigos fonte.</div><div style="text-align: justify;"><br /></div>
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<span style="font-family: inherit;">Vídeos </span>
</h3><div><span style="font-family: inherit;">Versão 2</span></div>
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<div class="separator" style="clear: both; text-align: center;"><iframe allowfullscreen="" class="BLOG_video_class" height="266" src="https://www.youtube.com/embed/5SDRE6BU_xE" width="320" youtube-src-id="5SDRE6BU_xE"></iframe></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><br /></div><div style="text-align: center;">Versão 1</div><div class="separator" style="clear: both; text-align: center;"><iframe allowfullscreen="" class="BLOG_video_class" height="266" src="https://www.youtube.com/embed/N5fOEZdyQE8" width="320" youtube-src-id="N5fOEZdyQE8"></iframe></div><br /><div class="separator" style="clear: both; text-align: center;"><br /></div></div>
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Guilhermehttp://www.blogger.com/profile/01893157551344267377noreply@blogger.com35Aracruz - Espírito Santo, Brésil-19.8189319 -40.273888800000009-20.297055399999998 -40.919335800000006 -19.3408084 -39.628441800000012tag:blogger.com,1999:blog-8832769654369184552.post-44494061889235022722013-05-27T17:46:00.002-03:002013-10-23T13:58:48.986-02:00Como Funciona um Potenciômetro<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhbS1QGX_XTO_6RFP40JQw5ACdA5oT1spoYz2prv-Itw_D2OeQPNWG4pg-t9pnI1tMKpBzbzjcYuimsXMLkbfvpFMNAlwHTQJcka5I1HBR2O_e2kKITUXDXm7mrJCyYLjp2YCKAEodN1oof/s1600/311x398_fotos_2986_ce51bff003c14856ebeec1ff07b79328.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img alt="Potenciômetro" border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhbS1QGX_XTO_6RFP40JQw5ACdA5oT1spoYz2prv-Itw_D2OeQPNWG4pg-t9pnI1tMKpBzbzjcYuimsXMLkbfvpFMNAlwHTQJcka5I1HBR2O_e2kKITUXDXm7mrJCyYLjp2YCKAEodN1oof/s400/311x398_fotos_2986_ce51bff003c14856ebeec1ff07b79328.jpg" title="Como funciona um Potenciômetro" width="310" /></a><span lang="PT-BR"> </span><span lang="PT-BR">Potenciômetros são resistores cujo valor de
resistência pode ser variado, girando-se um eixo que movimenta um contato móvel. Muitos já se perguntaram como funciona exatamente um potenciômetro para o controle de volume de um amplificador ou para o controle da corrente que circula num circuito. </span></div>
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<span style="font-size: large;">Introdução</span></h2>
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<span lang="PT-BR">Na <i>figura 1</i> podem-se ser observados alguns tipos de potenciômetros. </span><span lang="PT-BR">Os potenciômetros são largamente utilizados
em circuitos eletrônicos sendo facilmente encontrados com o objetivo de
controlar o volume e o tom dos receptores de rádio e amplificadores, para
controlar o brilho e o contraste dos receptores de TV mais antigos e podem
servir como sensores de posição ou de nível dependendo da aplicação. </span></div>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEidYYM5tsY8NwigIRaQ0tDQX71IcJFx-o8UWSOcTwez0eA6DM9YIEH8JRsbx5u6aX4kpdpaqNo5nkXMbacQXW9T5VQoaDGDumXhgw187Db1ZLaGfaEUYTzMZ6aYM9iq5FrMgxacHb01fUU2/s1600/4634.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Potenciômetro" border="0" height="194" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEidYYM5tsY8NwigIRaQ0tDQX71IcJFx-o8UWSOcTwez0eA6DM9YIEH8JRsbx5u6aX4kpdpaqNo5nkXMbacQXW9T5VQoaDGDumXhgw187Db1ZLaGfaEUYTzMZ6aYM9iq5FrMgxacHb01fUU2/s320/4634.png" title="Tipos de Potenciômetro" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 1 - Potenciômetros.</td></tr>
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<span lang="PT-BR">Na <i>figura 2A</i> apresentamos um dos mais
comuns, em seu aspecto externo real. Na <i>figura 2B</i> temos uma visão interna desse
potenciômetro.</span></div>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEibSenP7yHZ1qG-2NJ87e3RpLlr3-6W7YTsFOkFYUZakpiMAjHystaxy3YZAV_hk-mRGf9YdRtKrj601ketN_xeZoahlkvZBViQg06BKV1Zq9RsuLWCRt_NEdCaf3FRc2TxX53nFjHSLW2T/s1600/poten.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="potenciômetro" border="0" height="176" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEibSenP7yHZ1qG-2NJ87e3RpLlr3-6W7YTsFOkFYUZakpiMAjHystaxy3YZAV_hk-mRGf9YdRtKrj601ketN_xeZoahlkvZBViQg06BKV1Zq9RsuLWCRt_NEdCaf3FRc2TxX53nFjHSLW2T/s400/poten.png" title="Internamente de um potenciômetro" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 2 - Potenciômetro comum</td></tr>
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<span lang="PT-BR">Podemos notar que o potenciômetro apresenta
uma tira circular de composição de carvão depositado, chamada de pista, sobre o
qual se move o contato móvel do cursor, que é preso ao eixo rotativo. <span style="mso-spacerun: yes;"> </span>Assim, a resistência entre seus dois terminais
extremos é fixa em seu valor nominal (50 kΩ - por exemplo). Já o valor de
resistência entre uma das extremidades e a derivação central dependerá do
posicionamento do cursor. Cria-se, então, uma estrutura que pode ser
compreendida como dois resistores em série com uma derivação central, conforme
a<i> figura 3</i>.</span></div>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhqDHLd5sBWdHV_xuPemo2IAie6mOHnNZy9KNlw_Fb6wg22fgVhSoA0Dqs8vaukWdP8pzL0bStLyzW5jqZyKcveX7jx9hsAF_yon3kYpakjpe8JIpy3ZBeScCJwz4jWA9irAUJig27acb-J/s1600/pote.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Potenciometro" border="0" height="244" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhqDHLd5sBWdHV_xuPemo2IAie6mOHnNZy9KNlw_Fb6wg22fgVhSoA0Dqs8vaukWdP8pzL0bStLyzW5jqZyKcveX7jx9hsAF_yon3kYpakjpe8JIpy3ZBeScCJwz4jWA9irAUJig27acb-J/s640/pote.png" title="Funcionamento de um potenciômetro" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 3 - Funcionamento de um potenciômetro e circuito equivalente.</td></tr>
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<span lang="PT-BR"></span><span lang="PT-BR">De forma geral podemos usar o potenciômetro
de duas maneiras sendo elas para controle de tensão e como reostato.</span><br />
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<span lang="PT-BR" style="font-size: large;">Potenciômetro no Controle de Tensão </span></h2>
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<span lang="PT-BR">A utilização do potenciômetro nessa
configuração provoca uma queda de tensão proporcional à razão "D" entre a resistência
permitida (total) pela posição do terceiro terminal em relação a resistividade mais alta
possível da faixa. De fato essa razão "D" é dada por uma porcentagem da rotação do
cursor, por exemplo, se o cursor estiver na metade (D=50%) da faixa resistiva, então a
tensão de saída cairá exatamente 50% da tensão de entrada independentemente da tensão máxima do potenciômetro. Na <i>figura 4</i> e <i>5</i> temos o funcionamento básico de um potenciômetro no modo de controle de tensão. </span><br />
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgBt6fLy8dqv_mKx46IDi7n7uA_HffQnISx_DIPXPBemuUbt4ChunLz8zMEr38fw2ens_h_9_KvuZ_RDrrJmoUbZ7TtU_R8TP2Ti-eaNb0Ftq-Z_wpdrbUTgCmzJ-bDO5WsmJtrnoxewoFo/s1600/poten2d.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Controle de tensão" border="0" height="376" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgBt6fLy8dqv_mKx46IDi7n7uA_HffQnISx_DIPXPBemuUbt4ChunLz8zMEr38fw2ens_h_9_KvuZ_RDrrJmoUbZ7TtU_R8TP2Ti-eaNb0Ftq-Z_wpdrbUTgCmzJ-bDO5WsmJtrnoxewoFo/s640/poten2d.jpg" title="Controle de tensão com potenciômetro" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 4 - Funcionamento de um potenciômetro modo tensão ( 0 < D < 1 )</td></tr>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj4DFXJKMUCnluHCLWi0LUGFg0jcfFka53Sn8VnDI3ACs_cfRSYyTqHnugX388X_FJ5Sxt5XCRarDgw2A3mzKfbl9AIC-Aq9oD0OaPWyqeDj-Wd660KAUkLJsg90k4NXVSrJslMvPj-uj1P/s1600/controle+de+tensao.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Potenciômetro, como funciona" border="0" height="181" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj4DFXJKMUCnluHCLWi0LUGFg0jcfFka53Sn8VnDI3ACs_cfRSYyTqHnugX388X_FJ5Sxt5XCRarDgw2A3mzKfbl9AIC-Aq9oD0OaPWyqeDj-Wd660KAUkLJsg90k4NXVSrJslMvPj-uj1P/s400/controle+de+tensao.jpg" title="Funcionamento do Potenciômetro" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 5 - Exemplo de funcionamento.</td></tr>
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<span lang="PT-BR" style="font-size: large;">Potenciômetro com Reostato</span></h2>
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<span lang="PT-BR">Quando apenas dois dos três terminais são
usados, o potenciômetro atua como um tipo de resistor variável chamado de reostato.<span style="mso-spacerun: yes;"> </span>O terminal que sobra é ligado juntamente com
o terminal móvel. O reostato tem com objetivo controlar a corrente que
circulará pelo circuito. Note que para um potenciômetro comum, correntes
elevadas causará a queima do componente, portanto a corrente máxima deve ser
observada. </span></div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgaJOUcfUVSr-eoSU1GPE01kWMk-KZpV9ffpNH49RD3TgqKtLPwcdNCW67pDrMsOKPmrT-WKxpJNoiz3aTkiSIFBa3q5-mo7ps985FDJoTRXBu1f4OIKKNw1UDRCxRu04ahFTU22Iy7Y3oE/s1600/hjgfbhd+pote.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Reostato" border="0" height="220" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgaJOUcfUVSr-eoSU1GPE01kWMk-KZpV9ffpNH49RD3TgqKtLPwcdNCW67pDrMsOKPmrT-WKxpJNoiz3aTkiSIFBa3q5-mo7ps985FDJoTRXBu1f4OIKKNw1UDRCxRu04ahFTU22Iy7Y3oE/s640/hjgfbhd+pote.png" title="Potenciômetro modo reostato " width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 6 - Funcionamento do potenciômetro modo reostato.</td></tr>
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<span lang="PT-BR">Os reostatos são comumente usados no
controle de motores indústrias, esses reostatos são específicos para alta
potência sendo devidamente projetados para tal finalidade.</span></div>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg7jPAX5SOWeSn59xEB6N1V5HpeEm4mfu_t4XJiBdCysieC9BTkpRZ7aQBg5bvQMSRmKsk89swERGP84IcbvxY_6AgWqWY0-K-hRr5pnLBV_n781nir66zShpv15JdQ_lascoDrIQehfFfA/s1600/potenciometro5.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Reostato de potência" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg7jPAX5SOWeSn59xEB6N1V5HpeEm4mfu_t4XJiBdCysieC9BTkpRZ7aQBg5bvQMSRmKsk89swERGP84IcbvxY_6AgWqWY0-K-hRr5pnLBV_n781nir66zShpv15JdQ_lascoDrIQehfFfA/s1600/potenciometro5.png" title="Reostato" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 7 - Exemplo de um reostato de potência.</td></tr>
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<span lang="PT-BR" style="font-size: large;">Tipos de Potenciômetro</span></h2>
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<span lang="PT-BR">Os potenciômetros podem diferir em tipo em função da característica da trilha de carvão. Existem três tipos de potenciômetros que são os lineares, logaritmo e antilogaritmo conforme a<i> figura 8</i>. </span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh5N0fvFQmadwX6ZGO3IpkVSreJAaaJ6UEi1fu5-QxQCZ5XPJVtOSW_QHqDmMJeCJvO6lXtu8IaOT6B9rQEnSV4bqzxHQH67WCOo5u9DcHMprVSeUbDPZXx0LlT16bMnU7N2XTHwh0W08Rn/s1600/tipos.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img alt="Tipo de potenciometro" border="0" height="141" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh5N0fvFQmadwX6ZGO3IpkVSreJAaaJ6UEi1fu5-QxQCZ5XPJVtOSW_QHqDmMJeCJvO6lXtu8IaOT6B9rQEnSV4bqzxHQH67WCOo5u9DcHMprVSeUbDPZXx0LlT16bMnU7N2XTHwh0W08Rn/s400/tipos.png" title="Tipo de potênciometro" width="400" /></a></div>
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<span lang="PT-BR"><b>Confira o nosso Kit de Montagem Transmissor FM.</b></span></div>
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Guilhermehttp://www.blogger.com/profile/01893157551344267377noreply@blogger.com50tag:blogger.com,1999:blog-8832769654369184552.post-22705053981667185122013-04-30T14:40:00.000-03:002013-07-26T00:32:55.264-03:00Eagle 3D<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgbvJvvaOyvwI-Ix9FC3GvuqMXduXATHTRwh-OSJIHpJROvogAKT7XKQkfGyHFbqxrIR63Tdrm3SxswSGBX7irVtfTRBl5xKeflxV5TonC6MGwbilzGy6-wTd4iSzFDKaefTOVZmLHRgKuE/s1600/ezysgfsg.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img alt="como fazer imagens 3D eletronica" border="0" height="218" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgbvJvvaOyvwI-Ix9FC3GvuqMXduXATHTRwh-OSJIHpJROvogAKT7XKQkfGyHFbqxrIR63Tdrm3SxswSGBX7irVtfTRBl5xKeflxV5TonC6MGwbilzGy6-wTd4iSzFDKaefTOVZmLHRgKuE/s320/ezysgfsg.png" title="Eagle 3D" width="320" /></a><span style="font-family: inherit;"><span lang="PT-BR">Eagle, um dos melhores softwares para criação de
placas de circuito impresso,
isso nós já sabemos, mas como criar uma visualização 3D dos protótipos? </span></span></div>
<div class="MsoNormal" style="text-align: justify;">
<br /></div>
<div class="MsoNormal" style="text-align: justify;">
<span style="font-family: inherit;"><span lang="PT-BR">Confira
neste artigo como criar imagens 3D do circuito de forma simples e rápida. </span></span></div>
<span style="font-family: inherit;">
</span><br />
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
<br />
<br />
<br /></div>
<div class="MsoNormal">
<br />
<a name='more'></a></div>
<span style="font-family: inherit;">
</span><br />
<div class="MsoNormal">
<h2 style="text-align: left;">
<span style="font-family: inherit;"><span lang="PT-BR">Introdução</span></span></h2>
</div>
<span style="font-family: inherit;">
</span><br />
<div class="MsoNormal">
<span style="font-family: inherit;"><span lang="PT-BR"><br /></span></span></div>
<span style="font-family: inherit;">
</span><br />
<div class="MsoNormal" style="text-align: justify;">
<span style="font-family: inherit;"><span lang="PT-BR">Para a criação dos protótipos dos circuitos
eletrônicos em 3D necessitamos de três softwares devidamente instalados no
computador, sendo eles o Eagle, plug-in Eagle 3D e o Pov-Ray. A instalação desses programas e sua utilização é bem simples. Para que seja possivel gerar imagens 3D sigam as 4 etapas abaixo. </span></span></div>
<span style="font-family: inherit;">
</span><br />
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<br /></div>
<div class="MsoNormal" style="text-align: left;">
<h2 style="text-align: left;">
<span style="font-family: inherit;"><span lang="PT-BR">1° Etapa: Donwloads do Eagle e Programas Adicionais </span></span></h2>
</div>
<span style="font-family: inherit;">
</span><br />
<div class="MsoNormal">
<span style="font-family: inherit;"><span lang="PT-BR">Faça o Donwloads dos programas listados a
baixo:</span></span></div>
<span style="font-family: inherit;">
</span><br />
<div class="MsoNormal">
<span style="font-family: inherit;"><span lang="PT-BR"><a href="http://db.tt/Ub5aetfl" target="_blank">Eagle 5.11</a></span></span><br />
<a href="http://db.tt/U95m2V6d" target="_blank">Eagle 3D</a></div>
<div class="MsoNormal">
<a href="http://db.tt/0iTOUDex" target="_blank">Pov-Ray</a></div>
<span style="font-family: inherit;">
</span><br />
<div class="MsoNormal">
<h2 style="text-align: left;">
<span style="font-family: inherit;"><span lang="PT-BR">2° Etapa: Instalação</span></span></h2>
</div>
<span style="font-family: inherit;">
</span><br />
<div class="MsoNormal">
<span style="font-family: inherit;"><span lang="PT-BR">Instale os programas de acordo com os passos
a seguir:<b> </b></span></span><br />
<br />
<span style="font-family: inherit;"><span lang="PT-BR"><b>Instalação do Pov-Ray:</b> A instalação do <i>Pov-Ray</i> é bem
simples sem mais complicações necessitando somente de clicar nos next’s das
caixas de dialogo.</span></span></div>
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<span style="font-family: inherit;"><span lang="PT-BR"><b>Instalação do Eagle:</b> Com o arquivo <i>eagle-win-5.11.0</i> baixado
iniciamos a instalação (<i>Figura 1</i>). </span></span></div>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgwHoJWWRaI9YyxVBI_99zgW4s37jVHLPZl9A8FUl7v_r6eB4tvXdiHJYG2_fTx6ccJHdiqJuY8NC_4hA6iuBOAPj6x82iZ1EiW9xP6ygevo3-NDOAQJLlLaswispuvWSv9q2Z3-gtrTuW0/s1600/Eagle+instale1.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="3D no eagle como fazer" border="0" height="105" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgwHoJWWRaI9YyxVBI_99zgW4s37jVHLPZl9A8FUl7v_r6eB4tvXdiHJYG2_fTx6ccJHdiqJuY8NC_4hA6iuBOAPj6x82iZ1EiW9xP6ygevo3-NDOAQJLlLaswispuvWSv9q2Z3-gtrTuW0/s320/Eagle+instale1.png" title="Eagle 3D" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 1 - Instalação do Eagle</td></tr>
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<span style="font-family: inherit;"><span lang="PT-BR">Em seguida prossiga com a instalação normalmente até o momento da escolha do diretório que deve ser mudado para
maiores simplificações (<i>Figura 2</i>). <span style="mso-spacerun: yes;"> </span>Recomendo a
criação de uma nova pasta no "<i>C:</i>" para a instalação do Eagle (
Exemplo:<span style="mso-spacerun: yes;"> </span><i>C:\EAGLE-5.11.0 </i>). Após a criação do diretório e ter selecionado-o como destinação para o programa prossiga a instalação normalmente clicando em <i>Next</i>.</span></span></div>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDdO6aAj7EGLwahM9I_dswEAyG4j77j7zbIEDGqaMpVV959HvBq2zfFgCl20XrYnKPi0gXBAmXRQy1fyBPzGm19eWzExljFxHp6fayAm9mSvIPXCgVO6YaUEyVTiWtozpXuqpJDZXyfIJf/s1600/Eagle+instale2.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="imagens 3D no eagle" border="0" height="237" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDdO6aAj7EGLwahM9I_dswEAyG4j77j7zbIEDGqaMpVV959HvBq2zfFgCl20XrYnKPi0gXBAmXRQy1fyBPzGm19eWzExljFxHp6fayAm9mSvIPXCgVO6YaUEyVTiWtozpXuqpJDZXyfIJf/s320/Eagle+instale2.png" title="Eagle 3D" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 2 - Instalação do Eagle mudança de diretório. </td></tr>
</tbody></table>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjxk0J01c8Hz76uSmryjRv8cBeY8sSv8MbhxiQbB6BGfmk02uBQIqxThWjXtR-XfTOoL_Ug4BUI6Uz_Q55kwKlbz9B5IcA90WV25AD5yL_aLDSYcoMKYfBS-VQZV3DMRtvvG0-Gd8kFTHmp/s1600/Eagle+instale2.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><br /></a></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjxk0J01c8Hz76uSmryjRv8cBeY8sSv8MbhxiQbB6BGfmk02uBQIqxThWjXtR-XfTOoL_Ug4BUI6Uz_Q55kwKlbz9B5IcA90WV25AD5yL_aLDSYcoMKYfBS-VQZV3DMRtvvG0-Gd8kFTHmp/s1600/Eagle+instale2.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><br /></a></div>
<b><span style="font-family: inherit;"><span lang="PT-BR">Instalação do Eagle 3D:</span></span></b><span style="font-family: inherit;"><span lang="PT-BR"> Com o Eagle instalado corretamente podemos
prosseguir com a instalação do plug-in Eagle 3D. Para o bom funcionamento do
plug-in o diretório da sua instalação deve ser direcionado para a pasta <i>ULP</i> do Eagle
(C:\EAGLE-5.11.0\ulp) conforme a Figura 3. <span style="mso-spacerun: yes;"> </span></span></span><br />
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgr69qovzpSjWpV1YfSZ2PmVZa75yb1k4p2mZ8VDHMtvL5_cOQ_KZvQNMBOz_dFTJEvQr-y8UQlbtunmAvqNPYZAYNQYxMRTHKYcpByzoBpbxt_PrFoH8MtNtKZ95khzVF9p3RXWOltceH0/s1600/Eagle3D_1.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Configuração para o Plotagem 3D" border="0" height="310" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgr69qovzpSjWpV1YfSZ2PmVZa75yb1k4p2mZ8VDHMtvL5_cOQ_KZvQNMBOz_dFTJEvQr-y8UQlbtunmAvqNPYZAYNQYxMRTHKYcpByzoBpbxt_PrFoH8MtNtKZ95khzVF9p3RXWOltceH0/s400/Eagle3D_1.png" title="eagle 3D" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 3 - Diretório da instalação do Eagle 3D</td></tr>
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<span style="font-family: inherit;"><span lang="PT-BR">Prossiga com o comando <i>Next</i> até a finalização.</span></span>
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<span style="font-family: inherit;"><span lang="PT-BR">3° Etapa: Configuração para o Plotagem 3D</span></span></h2>
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<span style="font-family: inherit;"><span lang="PT-BR">Com todos os programas instalados
corretamente abra o seu projeto já finalizado no Eagle (no meu caso eu abri o exemplo do <i>Hexapod</i> do Eagle localizado na pasta <i>examples</i>) e na barra de ferramentas superior clique em ULP, conforme a <i>Figura 4</i>.</span></span></div>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEirYJyIEJTEZTBOT-ZMYE60Qo3F_ZUtdJCp-pGljfWI79kGleYmuWIpIFRKimEvB8l43PSPzvyCmNdqksr0u0cYD0wrnvgdVJC3J-ikNL60xcuAovjO6Dxys_bIePeFRDep6r_OpCaQ_N4K/s1600/utilizando.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Configuração para o Plotagem 3D" border="0" height="216" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEirYJyIEJTEZTBOT-ZMYE60Qo3F_ZUtdJCp-pGljfWI79kGleYmuWIpIFRKimEvB8l43PSPzvyCmNdqksr0u0cYD0wrnvgdVJC3J-ikNL60xcuAovjO6Dxys_bIePeFRDep6r_OpCaQ_N4K/s320/utilizando.png" title="eagle 3D" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 4 - Criação da imagem 3D do projeto.</td></tr>
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Localize os arquivos <i>.ulp</i> na pasta onde instalou o Eagle3d (Figura 5). No meu caso
os arquivos estão em “C:\EAGLE-5.11.0\ulp\Eagle3d\ulp” e escolha de acordo com a
versão de seu software:<br />
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3d40.ulp – versão 4 do Eagle.<br />
3d41.ulp – a partir da versão 4.1 do Eagle.<br />
3d50.ulp – Versão 5 ou superior do Eagle.<br />
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6vEQMGkhEB8cmIqRtERH_Tzsz5ojyDt3bnca_4aN86PZceSSZD1j67mM4UWSlnXPJEnk4t4jkNW36c59ooL1RteJZkZ9DMoKH3_P6X7_97Z9u3uvR2D0w_FpWF6ebwWzba0JoLLoxBXPk/s1600/utilizando2.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Configuração para o Plotagem 3D" border="0" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6vEQMGkhEB8cmIqRtERH_Tzsz5ojyDt3bnca_4aN86PZceSSZD1j67mM4UWSlnXPJEnk4t4jkNW36c59ooL1RteJZkZ9DMoKH3_P6X7_97Z9u3uvR2D0w_FpWF6ebwWzba0JoLLoxBXPk/s400/utilizando2.png" title="Eagle 3D" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 5 - Localização do arquivo .ulp</td></tr>
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<span style="font-family: inherit;"><span lang="PT-BR">Selecione abrir e</span></span><span style="font-family: inherit;"><span lang="PT-BR"> por fim selecione a língua da caixa de di</span></span><span style="font-family: inherit;"><span lang="PT-BR"><span style="font-family: inherit;"><span lang="PT-BR">á</span></span>logo e a pasta </span></span><span style="font-family: inherit;"><span lang="PT-BR"><span style="font-family: inherit;"><span lang="PT-BR">povray, localizada dentro dos diretório Eagle 3D (<i>Figura 6</i>),</span></span> para a saída dos arquivos<i> .pov</i> que serão gerados. Na pasta <i>povray</i> estão contidos também os arquivos <i>.ini</i> que são usados pelo programa Pov-Ray.</span></span></div>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhMX4QvMBg_eTJJUZjj5coWjVBLQece5ZvgLYlYhW8HiOY5K8GNSiCINXT62I7GhpuQM3LeXWHZyxGyjIMVzZSW1QyGpv8hJG3Ja4zxaTpbee_8AlQCEYhvv6vUwCCeRT5TT_b2Q7L6Zs-z/s1600/eagle3d-6.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Configuração para o Plotagem 3D" border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhMX4QvMBg_eTJJUZjj5coWjVBLQece5ZvgLYlYhW8HiOY5K8GNSiCINXT62I7GhpuQM3LeXWHZyxGyjIMVzZSW1QyGpv8hJG3Ja4zxaTpbee_8AlQCEYhvv6vUwCCeRT5TT_b2Q7L6Zs-z/s320/eagle3d-6.png" title="eagle 3D" width="253" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 6 - Localização da pasta povray.</td></tr>
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<span style="font-family: inherit;"><span lang="PT-BR">Clicando em OK prosseguimos para a <i>Figura 7</i>. Nas abas superiores existem varias opções para configurar a criação da imagem 3D do protótipo. Com a configuração de visualização desejada da imagem 3D podemos em seguida clicar em <i>Criar arquivo POVRay</i> (caixa selecionada em preto). </span></span></div>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhkIulIyDJO0rgua3wIwtQm4oISwJcX7ZO1kr1NLT1OJWZ-3a1qDRHEJtV6sF2MWXZRk37Nrzv9B_Rh0CFdDj5R0c6A4Uer8NpB6e6VMBCpOZPnSyCOaE2HSB7wc9en0OYYGBDT_MJk9cPj/s1600/utilizando3.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Configuração para geração da imagem 3D com o eagle" border="0" height="345" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhkIulIyDJO0rgua3wIwtQm4oISwJcX7ZO1kr1NLT1OJWZ-3a1qDRHEJtV6sF2MWXZRk37Nrzv9B_Rh0CFdDj5R0c6A4Uer8NpB6e6VMBCpOZPnSyCOaE2HSB7wc9en0OYYGBDT_MJk9cPj/s400/utilizando3.png" title="eagle 3D" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 7 - Configuração para geração da imagem 3D.</td></tr>
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<span style="font-family: inherit;">E<span lang="PT-BR">m seguida o programa ir</span></span><span style="font-family: inherit;"><span lang="PT-BR">á solicitar algumas configurações dos CI's e LED's por serem componentes especiais que podem sofrer algumas variações como cor e logon. é importante notar que criaremos uma imagem 3D estática do circuito e que para visualizações para novos anglos ou efeitos é necessário refazer os procedimentos das <i>Figuras 4</i> a <i>7</i>.</span></span></div>
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<h2 style="text-align: left;">
<span style="font-family: inherit; font-size: large;"><span lang="PT-BR">4° Etapa: Gerando a Visualização 3D</span></span></h2>
<span style="font-family: inherit;"><span lang="PT-BR"><br /></span></span></div>
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<span style="font-family: inherit;"><span lang="PT-BR">Apos a finalização da etapa 3° ser</span></span><span style="font-family: inherit;"><span lang="PT-BR">á necess</span></span><span style="font-family: inherit;"><span lang="PT-BR">ário abrir o programa Pov-Ray para executar o arquivo <i>.pov</i> gerado na pasta </span></span><span style="font-family: inherit;"><span lang="PT-BR"><span style="font-family: inherit;"><span lang="PT-BR"><i>povray</i> (C:\EAGLE-5.11.0\ulp\eagle3d\povray). </span></span></span></span></div>
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<span style="font-family: inherit;"><span lang="PT-BR"><span style="font-family: inherit;"><span lang="PT-BR">Para gerar a imagem 3D clique em <i>Open</i> e selecione o arquivo .pov no diretório C:\EAGLE-5.11.0\ulp\eagle3d\povray (meu caso) e em seguida em Run ou clique em Sel-Run e selecione o arquivo .pov. conforme a Figura 8. Com esse procedimento o programa Pov-Ray ira compilar a imagem 3D do circuito.</span></span></span></span></div>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtMTs3UOQMRIiG-K2rr9Tve6N56eyDhELZwPmcKmpmmasqQSzRulBKCEhzy1ivkZFxqAtsgRWm_13L2XatcvNHQQWey2vuT81G0yOhl_t-n5DKkBEueKOpTFdquanwjuns1AfQKfgSHDvP/s1600/utilizando4.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="iamgens 3D" border="0" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtMTs3UOQMRIiG-K2rr9Tve6N56eyDhELZwPmcKmpmmasqQSzRulBKCEhzy1ivkZFxqAtsgRWm_13L2XatcvNHQQWey2vuT81G0yOhl_t-n5DKkBEueKOpTFdquanwjuns1AfQKfgSHDvP/s400/utilizando4.png" title="Eagle 3D" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 8 - Gerando a imagem 3D.</td></tr>
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<span style="font-family: inherit;"><span lang="PT-BR">Protótipo final. </span></span></div>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgbvJvvaOyvwI-Ix9FC3GvuqMXduXATHTRwh-OSJIHpJROvogAKT7XKQkfGyHFbqxrIR63Tdrm3SxswSGBX7irVtfTRBl5xKeflxV5TonC6MGwbilzGy6-wTd4iSzFDKaefTOVZmLHRgKuE/s1600/ezysgfsg.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="prototipos em 3D com o eagle" border="0" height="436" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgbvJvvaOyvwI-Ix9FC3GvuqMXduXATHTRwh-OSJIHpJROvogAKT7XKQkfGyHFbqxrIR63Tdrm3SxswSGBX7irVtfTRBl5xKeflxV5TonC6MGwbilzGy6-wTd4iSzFDKaefTOVZmLHRgKuE/s640/ezysgfsg.png" title="eagle 3D" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 9 - Protótipo final em 3D.</td></tr>
</tbody></table>
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<div style="text-align: justify;">
Alguns componentes podem não ser visíveis por falta de <i>molds</i> pré definidos exigindo a sua instalação. Molds adicionais podem ser baixados facilmente na internet. </div>
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<h2 style="text-align: left;">
<span style="font-size: large;">Conclusão</span></h2>
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<br /></div>
<div style="text-align: justify;">
Com dois programas adicionais juntamento com o solftwre Eagle foi possível criar visualizações 3D do protótipo desejado. O programa Pov-Ray possui uma grande quantidade de <i>molds</i> pré definidos em seus arquivos facilitando a criação das imagens entretanto não é possível a geração de um modelo 3D propriamente sendo portanto sua limitação. </div>
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Guilhermehttp://www.blogger.com/profile/01893157551344267377noreply@blogger.com0Aracruz - Espírito Santo, Brésil-19.8189319 -40.273888800000009-20.2970619 -40.919335800000006 -19.3408019 -39.628441800000012tag:blogger.com,1999:blog-8832769654369184552.post-59608736532249347712013-04-14T01:46:00.000-03:002013-07-26T00:09:51.301-03:00Transistor Bipolar <div dir="ltr" style="text-align: left;" trbidi="on">
<span style="font-size: small;"><span style="font-family: inherit;"></span></span>
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<span style="font-size: small;"><span style="font-family: inherit;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhACEXIcnxk5ju5dpLwKUYMU9WFEyrde0InlOYbFuEnNmcEe8E-VpHqx0vaWrO-9F0NENu-hNnbcig27cVCvJ5egwZ8HFU8sw9I5ZhwjV0svG0FBZJ8symdhSQFvBNuIN08kabq_emkVYHp/s1600/MPS3904_40V_100mA_NPN_Switching_Transistor_007204.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img alt="como funciona um transistro, TBJ" border="0" height="198" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhACEXIcnxk5ju5dpLwKUYMU9WFEyrde0InlOYbFuEnNmcEe8E-VpHqx0vaWrO-9F0NENu-hNnbcig27cVCvJ5egwZ8HFU8sw9I5ZhwjV0svG0FBZJ8symdhSQFvBNuIN08kabq_emkVYHp/s200/MPS3904_40V_100mA_NPN_Switching_Transistor_007204.jpg" title="Transistor bipolar" width="200" /></a></span></span></div>
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<span style="font-size: small;"><span style="font-family: inherit;">Em novembro de 1947, os cientistas do laboratório da Bell Telephone
descobriram o transistor. O transistor é um dispositivo
semicondutor que é constituído por materiais do tipo <i><b>N</b></i> e do
tipo <i><b>P</b></i>. Os terminais dos transistores são indicados
pelas as letras E para emissor, C para coletor e B para base. Esses componentes são
chamados de TBJ (Transistor Bipolar de Junção).</span></span></div>
<div style="text-align: justify;">
<span style="font-size: small;"><span style="font-family: inherit;"><br /></span></span></div>
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<br /></div>
<a name='more'></a><h2 style="text-align: justify;">
<span style="font-family: inherit; font-size: large;">Introdução </span></h2>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
<span style="font-size: small;"><span style="font-family: inherit;">Entre 1904 e 1947 a válvula foi o dispositivo eletrônico de maior interesse de desenvolvimento. Em novembro de 1947, os cientistas Walter H. Brattain e Jonh Bardeen do laboratório da Bell Telephone
descobriram o transistor. Eles verificaram que quando aplicada certa tensão a um
dos terminais do componente, o sinal que saía no outro terminal era
amplificado [<a href="http://www.tecmundo.com.br/o-que-e/3596-o-que-e-um-transistor-e-porque-ele-e-importante-para-o-computador-.htm#ixzz2QP67tnA6" rel="nofollow" target="_blank">1</a>]. Os transistores consome uma menor quantidade de energia e possui tamanho reduzidos em relação as válvulas.</span></span><br />
<br />
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<![endif]--><span style="font-size: small;"><span style="font-family: inherit;">O transistor é um dispositivo
<a href="http://eletronicaemcasa.blogspot.com.br/2013/02/materiais-semicondutores.html" target="_blank">semicondutor</a> que é constituído em duas camadas de material tipo <i><b>N</b></i> e uma camada
tipo <i><b>P</b></i> ou duas do tipo <i><b>P</b></i> e uma do tipo <i><b>N</b></i> (Figura 1). Os terminais dos transistores são indicados
pelas as letras E para emissor, C para coletor e B para base. Esses componentes são
chamados de TBJ (Transistor Bipolar de Junção) [<a href="http://conhecimentovaleouro.blogspot.com.br/2011/05/dispositivos-eletronicos-e-teoria-de.html" target="_blank">2</a>].</span></span></div>
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<span style="font-size: small;"><span style="font-family: inherit;"><br /></span></span></div>
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<span style="font-size: small;"><span style="font-family: inherit;"><br /></span></span></div>
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><span style="font-size: small;"><span style="font-family: inherit;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEibIOodYrGruJPfSs5ajwBtq3X9BzpaPhJjDIt4npDOLP-G5URuWOX5ybiyV5UdIgFnQ8R9hvqcXifjn4gWhqpAwCxaOCQqfcNYGt87uXvBQ2aipq3HijCVfghOFqQs0DuUCIK2QvDvye1p/s1600/simbologia-NPN-PNP.gif" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="trasistor" border="0" height="255" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEibIOodYrGruJPfSs5ajwBtq3X9BzpaPhJjDIt4npDOLP-G5URuWOX5ybiyV5UdIgFnQ8R9hvqcXifjn4gWhqpAwCxaOCQqfcNYGt87uXvBQ2aipq3HijCVfghOFqQs0DuUCIK2QvDvye1p/s400/simbologia-NPN-PNP.gif" title="Funcionamento do transistor" width="400" /></a></span></span></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-size: small;"><span style="font-family: inherit;">Figura 1 - Tipo de transistores PNP (esquerda) e NPN (direita) [<a href="http://www.electronica-pt.com/index.php/content/view/47/37/" target="_blank">3</a>]</span></span></td></tr>
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<h2 class="MsoNormal" style="text-align: left;">
<span style="font-size: small;"><span style="font-family: inherit;"><span style="font-size: large;">Características Construtivas dos Transistores Bipolar</span></span></span></h2>
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<span style="font-size: small;"><span style="font-family: inherit;"><br /></span></span></div>
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<span style="font-size: small;"><span style="font-family: inherit;">A camada emissora é
fortemente dopado, com grande número de portadores de carga. O nome emissor vem
da propriedade de emitir portadores de carga. A base tem uma
dopagem média e é muito fina, não conseguindo absorver todos os portadores
emitidos pelo emissor<b>. </b>O colector tem uma
dopagem leve e é a maior das camadas, sendo o responsável pela coleta dos
portadores vindos do emissor [<a href="http://www.arvm.org/exames/trasistor.htm" rel="nofollow" target="_blank">4</a>]. </span></span></div>
<div align="justify">
<br /></div>
<div align="justify">
<span style="font-size: small;"><span style="font-family: inherit;">As camadas externas possuem larguras muito maiores do que a camada interna do tipo P ou N (<i>Razão entre a largura total e a largura da camada central é de 150:1</i>). Da mesma forma
que nos <a href="http://eletronicaemcasa.blogspot.com.br/2013/02/como-funciona-o-diodo.html" target="_blank">diodos</a>, são formadas barreiras de potencial nas junções das camadas P e
N. O comportamento
básico dos transistores em circuitos eletrônicos é fazer o controle da passagem
de corrente entre o emissor e o coletor através da base. Para isto é necessário
polarizar corretamente as junções do transistor.</span></span></div>
<div align="justify">
<span style="font-size: small;"><span style="font-family: inherit;"> </span></span></div>
<h2 class="MsoNormal" style="text-align: left;">
<span style="font-family: inherit; font-size: large;">Funcionamento dos Transistores</span>
</h2>
<div class="MsoNormal" style="text-align: justify;">
</div>
<div class="MsoNormal" style="text-align: justify;">
</div>
<span style="font-size: small;"><span style="font-family: inherit;">
</span></span><br />
<div class="MsoNormal" style="text-align: justify;">
<span style="font-size: small;"><span style="font-family: inherit;">O funcionamento básico dos
transistores é bem descrito em função da polarização dos seus terminais, pois
necessitamos polarizar diretamente os terminais EB e reversamente os terminais
BC. </span></span></div>
<span style="font-size: small;"><span style="font-family: inherit;">
</span></span><br />
<div class="MsoNormal" style="text-align: justify;">
<span style="font-size: small;"><span style="font-family: inherit;">Para melhor entendermos os
efeitos das polarizações nas junções <i><b>N</b></i> e <b><i>P</i></b>, analisaremos de forma separada os
terminais EB e BC (<i>Figura 1 </i>e<i> 2</i>). Observer a seguir a polarização direta do Emissor e Base<span style="font-size: small;"> <span style="font-size: small;">n</span>o transistor </span><i><b>PNP</b></i> (transistor com sequência de material <a href="http://eletronicaemcasa.blogspot.com.br/2013/02/materiais-semicondutores.html" target="_blank">semicondutor</a> <i><b>P</b></i>+<b><i>N</i></b>+<i><b>P</b></i>),(<i>Figura 1</i>). </span></span></div>
<span style="font-size: small;"><span style="font-family: inherit;">
</span></span><br />
<div class="MsoNormal" style="text-align: justify;">
<br /></div>
<span style="font-size: small;"><span style="font-family: inherit;">
</span></span><br />
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><span style="font-size: small;"><span style="font-family: inherit;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgiVqyXLGfoumWzkAtGTBKpMqiuyGB_m3mTQqa5UhqbO5FLaeJGk4e2QJeWVhsIqlqTDVYIehfvwm6tryqxbRBZIkT0mmAHPnvcs7eT8AVvAalKANDLMqkaSM9mGczFSSyKWU4ARUM9y2Li/s1600/Diretamente.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Funcionamento do transistor" border="0" height="244" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgiVqyXLGfoumWzkAtGTBKpMqiuyGB_m3mTQqa5UhqbO5FLaeJGk4e2QJeWVhsIqlqTDVYIehfvwm6tryqxbRBZIkT0mmAHPnvcs7eT8AVvAalKANDLMqkaSM9mGczFSSyKWU4ARUM9y2Li/s320/Diretamente.png" title="Como funciona um transistor" width="320" /></a></span></span></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-size: small;"><span style="font-family: inherit;">Figura 1 - Polarização direta da junção P-N [<a href="http://conhecimentovaleouro.blogspot.com.br/2011/05/dispositivos-eletronicos-e-teoria-de.html" rel="nofollow" target="_blank">2</a>].</span></span></td></tr>
</tbody></table>
<div class="MsoNormal" style="text-align: justify;">
<span style="font-size: small;"><span style="font-family: inherit;"><br /></span></span></div>
<span style="font-size: small;"><span style="font-family: inherit;">
</span></span><br />
<span style="font-size: small;"><span style="font-family: inherit;">
</span></span><br />
<div class="MsoNormal" style="text-align: justify;">
<span style="font-size: small;"><span style="font-family: inherit;">Pode-se notar um efeito semelhante
de polarização a do diodo, discutido anteriormente em “<a href="http://eletronicaemcasa.blogspot.com.br/2013/02/como-funciona-o-diodo.html" target="_blank">Como Funciona o Diodo</a>”.
A região de depleção entre as junções teve seu tamanho reduzido devido à tensão
direta aplicada, resultando em um fluxo denso de portadores majoritários do
material do tipo <i><b>P</b></i> para o do tipo <b><i>N</i></b> (</span></span><span style="font-size: small;"><span style="font-family: inherit;"><span style="font-size: small;"><span style="font-family: inherit;"><i>Figura 1</i></span></span>). Já para a polarização revessa,
entre B e C, pode ser observada na <i>Figura 2</i>. Nes<span style="font-size: small;">t</span>a situação o fluxo de
portadores majoritários é zero, resultando em apenas em um fluxo de portadores
minoritários. <span style="font-size: small;">Neste caso</span> temos um aumento da região de depleção. </span></span>
</div>
<div class="MsoNormal" style="text-align: justify;">
<br /></div>
<span style="font-size: small;"><span style="font-family: inherit;">
</span></span><br />
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><span style="font-size: small;"><span style="font-family: inherit;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDrFHdAjga2ig0l-39xeokDsQKZa5Ok9RjesPjlI8trBYdPy0b0r6O8jx5RcZpPHrqDmfinN2bQYnc0OVTC-tHGznuHsP9_JwpzvexZ4kRar1uqgqxSZrZqIerzl0yizVaHb86o-Jh5j-M/s1600/reversamente.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Funcionamento do transistor" border="0" height="229" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDrFHdAjga2ig0l-39xeokDsQKZa5Ok9RjesPjlI8trBYdPy0b0r6O8jx5RcZpPHrqDmfinN2bQYnc0OVTC-tHGznuHsP9_JwpzvexZ4kRar1uqgqxSZrZqIerzl0yizVaHb86o-Jh5j-M/s320/reversamente.png" title="Como funciona um transistor" width="320" /></a></span></span></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-size: small;"><span style="font-family: inherit;">Figura 2 - Polarização reversa da junção N-P [<a href="http://conhecimentovaleouro.blogspot.com.br/2011/05/dispositivos-eletronicos-e-teoria-de.html" rel="nofollow" target="_blank">2</a>].</span></span></td></tr>
</tbody></table>
<span style="font-size: small;"><span style="font-family: inherit;">
</span></span><br />
<div class="MsoNormal" style="text-align: justify;">
<br /></div>
<span style="font-size: small;"><span style="font-family: inherit;">
</span></span><br />
<div class="MsoNormal" style="text-align: justify;">
<span style="font-size: small;"><span style="font-family: inherit;">De forma geral um transistor
funcionará corretamente (de forma ligada) quando uma junção <i><b>P</b></i>-<i><b>N</b></i>, entre o
terminal Emissor e Base, for polarizada diretamente enquanto que a outra junção
<i><b>N</b></i>-<b><i>P</i></b> (Base e Coletor) for reversamente. </span></span></div>
<div class="MsoNormal" style="text-align: justify;">
<br /></div>
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><span style="font-size: small;"><span style="font-family: inherit;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiJzvJlobyYUfW9PodiWzmnmwI-9w5uvvXxnwTRS4NOyN2nh8BqSA2pGFY_l_TJgzDWpYATlStSkD9OCh_dNZ6X_ceLooojzDZPXDtBzieCDow730X3tanRG0UoBJfALzUntKjcShA5vZOK/s1600/funcionamento.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Funcionamento do transistor" border="0" height="252" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiJzvJlobyYUfW9PodiWzmnmwI-9w5uvvXxnwTRS4NOyN2nh8BqSA2pGFY_l_TJgzDWpYATlStSkD9OCh_dNZ6X_ceLooojzDZPXDtBzieCDow730X3tanRG0UoBJfALzUntKjcShA5vZOK/s400/funcionamento.png" title="Como funciona um transistor" width="400" /></a></span></span></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-size: small;"><span style="font-family: inherit;">Figura 3 - Fluxo de portadores majoritários e minoritários [<a href="http://conhecimentovaleouro.blogspot.com.br/2011/05/dispositivos-eletronicos-e-teoria-de.html" rel="nofollow" target="_blank">2</a>]. </span></span></td></tr>
</tbody></table>
<div class="MsoNormal" style="text-align: justify;">
<br /></div>
<span style="font-size: small;"><span style="font-family: inherit;">
</span></span><br />
<span style="font-size: small;"><span style="font-family: inherit;">
</span></span><br />
<div class="MsoNormal" style="text-align: justify;">
<span style="font-size: small;"><span style="font-family: inherit;">Quando polarizamos diretamente os
terminais EB e reversamente os terminais BC de forma simultânea ocorre um fluxo
de portadores entre o Emissor e o Coletor, pois o material do tipo <i><b>N</b></i> é muito
fino, portanto muitos dos portadores majoritários passarão para o material tipo
<i><b>P</b></i> seguinte e uma quantidade (<i>Ib</i>) pequena vai para o terminal de base (<i>Figura 3</i>). </span></span></div>
<div style="text-align: left;">
</div>
<div class="MsoNormal" style="text-align: justify;">
<br /></div>
<div class="MsoNormal" style="text-align: justify;">
<span style="font-size: small;"><span style="font-family: inherit;">Para entendermos essa corrente entre
o Emissor e Coletor devemos nos lembramos de que para um diodo polarizado
reversamente (Terminais Base e Coletor) os portadores majoritários serão como
portadores minoritários no material tipo <i><b>N</b></i>. Ou seja, houve uma injeção de
portadores minoritários no material tipo <i><b>N</b></i> da base [<a href="http://conhecimentovaleouro.blogspot.com.br/2011/05/dispositivos-eletronicos-e-teoria-de.html" rel="nofollow" target="_blank">2</a>]. </span></span></div>
<div class="MsoNormal" style="text-align: justify;">
<br /></div>
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><span style="font-size: small;"><span style="font-family: inherit;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjbaQMg04KAP2C2PXI4bC8Nj6Rnpf437qK-kBRlMlqJFlG1exgu00uyRuXJ9H0yZWzbCTz2iLTBUitHIyjMClQ064XYOCJ4yeI2dmVIyyxnAydcIwvBO9fVevwgQoZKYTKr9BZvWvkWdf5u/s1600/PNP.gif" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Funcionamento do transistor" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjbaQMg04KAP2C2PXI4bC8Nj6Rnpf437qK-kBRlMlqJFlG1exgu00uyRuXJ9H0yZWzbCTz2iLTBUitHIyjMClQ064XYOCJ4yeI2dmVIyyxnAydcIwvBO9fVevwgQoZKYTKr9BZvWvkWdf5u/s1600/PNP.gif" title="Como funciona um transistor" /></a></span></span></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-size: small;"><span style="font-family: inherit;">Figura 4 - Funcionamento do transistor [ <a href="http://www.agostinhorosa.com.br/artigos/funcionamento-do-transistor.html" rel="nofollow" target="_blank">5</a> ]</span></span></td></tr>
</tbody></table>
<div class="MsoNormal" style="text-align: justify;">
<br /></div>
<div class="MsoNormal" style="text-align: justify;">
<span style="font-size: small;"><span style="font-family: inherit;">Se aumentarmos a corrente que flui na base do transistor aumentamos por consequência a corrente que flui entre Emissor e <span style="font-size: small;">C</span>oletor. Podemos controlar a corrente que atravessa o transistor através da corrente de Base. Exi<span style="font-size: small;">ste u<span style="font-size: small;">ma amplificação da corrente de Base <span style="font-size: small;">para a cor<span style="font-size: small;">rente de Coletor que é dad<span style="font-size: small;">a</span> por um fator Beta<span style="font-size: small;">. <i>I<span style="font-size: x-small;">c</span>=B*I<span style="font-size: x-small;">b</span></i><span style="font-size: small;">, onde Beta é o ganho do transist<span style="font-size: small;">or e pode ser encontrado nas folhas de <i>datasheet</i> do componente<span style="font-size: small;">.</span></span></span></span></span></span></span></span></span></span></div>
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<h2 class="MsoNormal" style="text-align: left;">
<span style="font-family: inherit; font-size: large;">Referências</span></h2>
<div class="MsoNormal" style="text-align: justify;">
<span style="font-size: small;"><span style="font-family: inherit;"><br /></span></span></div>
<div class="MsoNormal" style="text-align: justify;">
<span style="font-size: small;"><span style="font-family: inherit;">[1]-<a href="http://www.tecmundo.com.br/o-que-e/3596-o-que-e-um-transistor-e-porque-ele-e-importante-para-o-computador-.htm#ixzz2QP67tnA6" target="_blank">http://www.tecmundo.com.br/o-que-e/3596-o-que-e-um-transistor-e-porque-ele-e-importante-para-o-computador-.htm#ixzz2QP67tnA6</a></span></span></div>
<div class="MsoNormal" style="text-align: justify;">
<span style="font-size: small;"><span style="font-family: inherit;">[2]-<a href="http://conhecimentovaleouro.blogspot.com.br/2011/05/dispositivos-eletronicos-e-teoria-de.html" target="_blank">http://conhecimentovaleouro.blogspot.com.br/2011/05/dispositivos-eletronicos-e-teoria-de.html</a></span></span></div>
<div class="MsoNormal" style="text-align: justify;">
<span style="font-size: small;"><span style="font-family: inherit;">[3]-<a href="http://www.electronica-pt.com/index.php/content/view/47/37/" target="_blank">http://www.electronica-pt.com/index.php/content/view/47/37/</a> </span></span></div>
<div class="MsoNormal" style="text-align: justify;">
<span style="font-size: small;"><span style="font-family: inherit;">[4]-<a href="http://www.arvm.org/exames/trasistor.htm" target="_blank">http://www.arvm.org/exames/trasistor.htm</a></span></span></div>
<div class="MsoNormal" style="text-align: justify;">
<span style="font-size: small;"><span style="font-family: inherit;">[5]-<a href="http://www.agostinhorosa.com.br/artigos/funcionamento-do-transistor.html" target="_blank">http://www.agostinhorosa.com.br/artigos/funcionamento-do-transistor.html</a></span></span></div>
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<span style="font-size: small;"><span style="font-family: inherit;"><br /></span></span></div>
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<span lang="PT-BR" style="font-family: "Times New Roman","serif";"><span style="mso-spacerun: yes;"><br /></span></span></div>
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<span lang="PT-BR" style="font-family: "Times New Roman","serif";"><span style="mso-spacerun: yes;"><br /></span></span></div>
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<span lang="PT-BR" style="font-family: "Times New Roman","serif";"><span style="mso-spacerun: yes;"><br /></span></span></div>
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</div>
Guilhermehttp://www.blogger.com/profile/01893157551344267377noreply@blogger.com0tag:blogger.com,1999:blog-8832769654369184552.post-77578103043841157122013-03-21T21:24:00.001-03:002013-10-23T14:00:12.795-02:00Versão 12.0 do Multisim<div dir="ltr" style="text-align: left;" trbidi="on">
<br />
<br />
<div style="text-align: justify;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjS52Lb3vNO_asmrcVOkzxTmTVLtKE7m0w8GD3UQs1LEEckaKR9C9eOd7P4CFboQw4oXNjv7SNGy_GXOmZ3e2WpWOt_3bmMft4krDEXZHhBrgtvIppXnv7_0BmuhT067UwA-1sumiJztD4W/s1600/multisim_12.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img alt="Eletronica em Casa" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjS52Lb3vNO_asmrcVOkzxTmTVLtKE7m0w8GD3UQs1LEEckaKR9C9eOd7P4CFboQw4oXNjv7SNGy_GXOmZ3e2WpWOt_3bmMft4krDEXZHhBrgtvIppXnv7_0BmuhT067UwA-1sumiJztD4W/s1600/multisim_12.jpg" title="Multisim 12.0" /></a>Em 06/03/2012 a National Instruments lançou a versão 12.0 do Multisim. O NI Multisim 12.0 oferece solução completa para a simulação e desenvolvimento de circuitos eletrônicos otimizados. A versão 12.0 do ambiente de simulação de circuitos Multisim
simplifica a simulação tradicional de circuitos, usando uma abordagem
gráfica intuitiva com edições especiais para o projeto de circuitos e o
ensino da eletrônica.</div>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
</div>
<a name='more'></a><h2 style="text-align: left;">
<span style="font-size: large;">Introdução </span></h2>
<br />
<div style="text-align: justify;">
O
Multisim 12.0 Professional Edition é baseado na simulação SPICE padrão
da indústria e otimizado para proporcionar a máxima usabilidade.
Os usuários podem melhorar o desempenho do projeto de suas
aplicações, minimizando erros e iterações com o protótipo, usando as
ferramentas de simulação do Multisim. O
Multisim 12.0 também oferece uma ótima integração com o
LabVIEW para a simulação de malha fechada de sistemas analógicos e
digitais. Seguindo essa abordagem totalmente nova de projeto, os usuários podem validar a lógica de controle digital de FPGAs
(field-programmable gate arrays) juntamente com os circuitos analógicos
(como, por exemplo, as aplicações de potência). O Multisim Professional
Edition é otimizado para atender os requisitos do roteamento de layouts e
rapid prototyping.</div>
<div style="text-align: justify;">
<br /></div>
<div style="text-align: justify;">
O download do NI Multisim 12.0
Education<b> </b>Edition podem ser feito diretamente no site da National Instruments mediante a um cadastro básico no sistema. </div>
<ul style="text-align: left;">
<li><a href="https://lumen.ni.com/nicif/extend.xhtml;jsessionid=y1PxRLhGG1hrTd2tJ0Lkp52wTtmtS1gcNTmcGDg1Q7GwhPchbmKJ%21-1811347704" target="_blank">Cadastro para baixar o Multisim 12.0 Education Edition</a> </li>
</ul>
<br />
Já o download do NI Multisim 12.0 Professional<b> </b>Edition podem ser feito no site da National Instruments sem a necessidade de cadastros<br />
<ul style="text-align: left;">
<li><a href="https://lumen.ni.com/nicif/us/evalmultisim/content.xhtml" target="_blank">Multisim 12.0 Professional Edition</a></li>
</ul>
<br />
As versões Education e Professional são do tipo Trial valido por 30 dias.<br />
<br />
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEilzau4KwMfmgEB1mX-7dSu_1ymn39Rc3QU1J6b9qRkqFmQOaeoFQ69Dm6vL-HWGmckpkme4Daat9Jh7LNPtXlpzzuFlrdYwoJ_DIno_Wg_lIIiNDs9QO7wXKX-8GYPr70yycCktlhrRrrP/s1600/multisim.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="Eletronica em Casa " border="0" height="210" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEilzau4KwMfmgEB1mX-7dSu_1ymn39Rc3QU1J6b9qRkqFmQOaeoFQ69Dm6vL-HWGmckpkme4Daat9Jh7LNPtXlpzzuFlrdYwoJ_DIno_Wg_lIIiNDs9QO7wXKX-8GYPr70yycCktlhrRrrP/s400/multisim.png" title="Multisim 12.0" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Figura 1 - Ambiente de simulação do Multisim</td></tr>
</tbody></table>
<br />
<h2 style="text-align: left;">
<b><span style="font-size: large;">Recursos do Multisim</span></b></h2>
<br />
<h3 style="text-align: left;">
<span style="font-size: small;"><b>Multisim 12.0 Professional Edition</b></span></h3>
<div style="text-align: left;">
<br /></div>
<ul>
<li>A simulação do controle do sistema por malha fechada em aplicações
analógicas e digitais com o Multisim e o LabVIEW economiza tempo no
fluxo do projeto.</li>
<li>Todas as novas melhorias relacionadas a bancos de dados, incluindo
modelos eletromecânicos, conversores de alimentação CA/CC e fontes de
alimentação comutadas para o projeto de aplicações de potência.</li>
<li>Novo banco de dados com mais de 2.000 novos componentes da Analog Devices, National Semiconductor, NXP e Philips</li>
<li>Mais de 90 novos símbolos de conectores com representações realistas
das pinagens facilitam o projeto de acessórios customizados para o
hardware da National Instruments</li>
</ul>
<br />
<h3 style="text-align: left;">
<b>Multisim 12.0 Education Edition</b></h3>
<br />
<ul style="text-align: left;">
<li>Facilita a criação de projetos pelos estudantes, com representações
exatas das pinagens dos conectores para o hardware educacional da
National Instruments, incluindo o NI myDAQ.</li>
</ul>
<ul style="text-align: left;">
<li>Componentes de potência e máquina totalmente novos para o ensino da mecatrônica e da eletrônica de potência.</li>
</ul>
<ul style="text-align: left;">
<li>Maior suporte aos cursos de teoria digital, com o novo suporte a ferramentas Xilinx FPGA (12.x e 13.x)</li>
</ul>
<ul style="text-align: left;">
<li>Simulação de laboratórios completos de sistemas analógicos e digitais
via desktop com o LabVIEW, para o ensino de teorias de controle,
energia, potência e mecatrônica.</li>
</ul>
<br />
Maiores informações podem ser consultadas em: <a href="http://brasil.ni.com/" target="_blank">http://brasil.ni.com/</a><br />
<br />
<br />
<br />
<br />
<div style="text-align: center;">
<span lang="PT-BR"><b>Confira o nosso Kit de Montagem Transmissor FM.</b></span></div>
<div style="text-align: center;">
<a href="http://produto.mercadolivre.com.br/MLB-518578685-transmissor-de-fm-espio-kit-para-montar-_JM" rel="nofollow" target="_blank"><img border="0" height="165" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhObFf70zJ4H4hJxx3aCWkUEnNGB8qb2gejuRbXEeUlOdOzp-UtTi_fxd1IuekpAf1WkHuIkutUy41mua3DAnnJ8MGMNRuMjK3d_IE9RhkLJbEpVRizhteDTw-fYVLFdrOBaI2Reh9lFZeJ/s320/rzgzgrg.png" width="200" /></a><span lang="PT-BR"><b> </b></span></div>
<div style="text-align: center;">
<span lang="PT-BR"><b>Enviamos para todo o Brasil</b></span></div>
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Guilhermehttp://www.blogger.com/profile/01893157551344267377noreply@blogger.com0