{"id":1324,"date":"2025-03-29T17:19:14","date_gmt":"2025-03-29T09:19:14","guid":{"rendered":"https:\/\/topfastpcba.com\/?p=1324"},"modified":"2025-03-29T17:19:52","modified_gmt":"2025-03-29T09:19:52","slug":"how-to-design-a-pcb","status":"publish","type":"post","link":"https:\/\/topfastpcba.com\/pt\/how-to-design-a-pcb\/","title":{"rendered":"\u200chow to design a pcb\uff1f"},"content":{"rendered":"<p>O projeto de PCB \u00e9 um aspecto essencial da engenharia eletr\u00f4nica, que envolve a convers\u00e3o de esquemas de circuitos em layouts reais de placas de circuito impresso prontas para produ\u00e7\u00e3o, exigindo uma considera\u00e7\u00e3o abrangente do layout dos componentes, da integridade do sinal, da dissipa\u00e7\u00e3o de calor e da compatibilidade eletromagn\u00e9tica.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_75 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u00cdndice<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/topfastpcba.com\/pt\/how-to-design-a-pcb\/#The_basic_process_of_PCB_design\" >O processo b\u00e1sico de projeto de PCB<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/topfastpcba.com\/pt\/how-to-design-a-pcb\/#PCB_design_rules\" >Regras de projeto de PCB<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/topfastpcba.com\/pt\/how-to-design-a-pcb\/#PCB_design_skills\" >Habilidades de projeto de PCB<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/topfastpcba.com\/pt\/how-to-design-a-pcb\/#Key_Points_for_PCB_Design\" >Pontos-chave para o projeto de PCB<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"The_basic_process_of_PCB_design\"><\/span>O processo b\u00e1sico de projeto de PCB<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"871\" height=\"518\" src=\"https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/03\/PCB-design-1.jpg\" alt=\"\" class=\"wp-image-1325\" style=\"width:600px\" srcset=\"https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/03\/PCB-design-1.jpg 871w, https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/03\/PCB-design-1-300x178.jpg 300w, https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/03\/PCB-design-1-768x457.jpg 768w, https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/03\/PCB-design-1-150x89.jpg 150w\" sizes=\"auto, (max-width: 871px) 100vw, 871px\" \/><\/figure>\n<\/div>\n\n\n<p>O projeto de PCB geralmente inclui as seguintes etapas principais:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>An\u00e1lise e planejamento da demanda<\/strong><br>Os engenheiros planejam os m\u00f3dulos b\u00e1sicos do circuito e desenham o diagrama do circuito do produto de acordo com as condi\u00e7\u00f5es do local do circuito, a pesquisa de mercado ou as necessidades de inova\u00e7\u00e3o do produto.<br>Determine a fun\u00e7\u00e3o do circuito, o tipo de sinal (alta velocidade, baixa frequ\u00eancia, RF, etc.).<br>Selecione o n\u00famero de camadas de PCB (placas simples, duplas ou multicamadas).<br>Determine as dimens\u00f5es, os m\u00e9todos de montagem e as restri\u00e7\u00f5es mec\u00e2nicas.<\/li>\n\n\n\n<li><strong>Projeto esquem\u00e1tico<\/strong><br>Desenhe diagramas esquem\u00e1ticos espec\u00edficos com base no diagrama de estrutura do circuito do produto para materializar o sistema de circuitos.<br>Use ferramentas de EDA (Electronic Design Automation) (por exemplo, Altium Designer, KiCad, Cadence, etc.) para desenhar o esquema do circuito.<br>Certifique-se de que todos os componentes estejam corretamente simbolizados e conectados.<br>Execute o ERC (Electrical Rule Check) para evitar problemas como curtos-circuitos, circuitos abertos, etc.<\/li>\n\n\n\n<li><strong>Layout da placa de circuito impresso<\/strong><br>Depois de desenhar o esquema, voc\u00ea precisa transferir o pacote de componentes e as informa\u00e7\u00f5es de conex\u00e3o dos componentes para o ambiente de design da placa de circuito impresso. Depois que o pacote de componentes for transferido para o ambiente de design da placa de circuito impresso, voc\u00ea precisar\u00e1 dispor os componentes de acordo com o formato do chassi do produto, a estrutura do painel, as especifica\u00e7\u00f5es de EMC, os requisitos razo\u00e1veis para o layout el\u00e9trico e as caracter\u00edsticas da estrutura empilhada do design da placa de circuito impresso.<br>Os componentes s\u00e3o colocados na placa de circuito impresso de acordo com o diagrama esquem\u00e1tico, levando em conta fatores como fluxo de sinal, dissipa\u00e7\u00e3o de calor e compatibilidade eletromagn\u00e9tica (EMC).<br>Os principais componentes (por exemplo, MCU, cristal, m\u00f3dulo de alimenta\u00e7\u00e3o) s\u00e3o priorizados no layout para encurtar o caminho do sinal cr\u00edtico.<br>Layout de parti\u00e7\u00e3o: as partes anal\u00f3gicas, digitais e da fonte de alimenta\u00e7\u00e3o s\u00e3o separadas para reduzir a interfer\u00eancia.<\/li>\n\n\n\n<li><strong>Fia\u00e7\u00e3o da placa de circuito impresso<\/strong><br>Depois que os componentes s\u00e3o organizados, as linhas pr\u00e9-desenhadas geradas de acordo com a tabela de rede no projeto da placa de circuito impresso s\u00e3o preenchidas com linhas s\u00f3lidas, e a racionalidade da fia\u00e7\u00e3o da placa de circuito afetar\u00e1 diretamente a qualidade da placa de circuito.<br>Fia\u00e7\u00e3o de energia: amplie a linha de energia, reduza a imped\u00e2ncia e evite a queda de tens\u00e3o.<br>Linhas de sinal: sinais de alta velocidade (como USB, HDMI) precisam controlar a imped\u00e2ncia para evitar um alinhamento muito longo.<br>Processamento de aterramento: usando aterramento em estrela ou colocando cobre para reduzir o ru\u00eddo.<\/li>\n\n\n\n<li><strong>DRC (verifica\u00e7\u00e3o de regras de projeto)<\/strong><br>Verifique se a largura do fio, o espa\u00e7amento e os furos de cruzamento atendem aos requisitos de fabrica\u00e7\u00e3o.<br>Confirme se n\u00e3o h\u00e1 curtos-circuitos, circuitos interrompidos, redes desconectadas, etc.<\/li>\n\n\n\n<li><strong>Arquivos de produ\u00e7\u00e3o de sa\u00edda<\/strong><br>Gerar arquivo Gerber (para fabrica\u00e7\u00e3o de PCB).<br>Fornecer arquivo de perfura\u00e7\u00e3o (NC Drill) e BOM (Bill of Materials).<\/li>\n<\/ol>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"PCB_design_rules\"><\/span>Regras de projeto de PCB<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"831\" height=\"708\" data-id=\"1329\" src=\"https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/03\/PCB-design-2-2.jpg\" alt=\"\" class=\"wp-image-1329\" srcset=\"https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/03\/PCB-design-2-2.jpg 831w, https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/03\/PCB-design-2-2-300x256.jpg 300w, https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/03\/PCB-design-2-2-768x654.jpg 768w, https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/03\/PCB-design-2-2-150x128.jpg 150w\" sizes=\"auto, (max-width: 831px) 100vw, 831px\" \/><\/figure>\n<\/figure>\n\n\n\n<p>1. em geral, todos os componentes devem ser dispostos na mesma superf\u00edcie da placa de circuito, apenas a camada superior de componentes \u00e9 muito densa, para que haja uma s\u00e9rie de dispositivos t\u00e9rmicos pequenos e altamente limitados, como resistores de chip, capacitores de chip, CIs de chip e assim por diante na camada inferior.<br>2. sob a premissa de garantir o desempenho el\u00e9trico, os componentes devem ser colocados na grade e paralelos ou perpendiculares uns aos outros, de modo a ficarem limpos, bonitos e, em geral, n\u00e3o permitir que os componentes se sobreponham; os componentes devem ser organizados de forma compacta, e todo o layout deve ser distribu\u00eddo uniformemente, denso e consistente.<br>3. A dist\u00e2ncia m\u00ednima entre os gr\u00e1ficos de blocos adjacentes de diferentes componentes na placa de circuito deve ser superior a 1MM.<br>4. a partir da borda da placa de circuito geralmente n\u00e3o \u00e9 inferior a 2MM. a melhor forma da placa de circuito para o retangular, a rela\u00e7\u00e3o comprimento\/largura de 3:2 ou 4:3. a filmagem da superf\u00edcie da placa de circuito \u00e9 superior a 200MM por 150MM, deve ser considerada quando a placa de circuito pode suportar a resist\u00eancia mec\u00e2nica.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"PCB_design_skills\"><\/span>Habilidades de projeto de PCB<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>No projeto de layout da placa de circuito impresso para analisar a unidade da placa de circuito, com base na fun\u00e7\u00e3o inicial do projeto de layout, o layout de todos os componentes do circuito deve obedecer aos seguintes princ\u00edpios:<br>1. de acordo com o fluxo do circuito para organizar a localiza\u00e7\u00e3o de cada unidade de circuito funcional, de modo que o layout facilite o fluxo de sinais e fa\u00e7a com que os sinais mantenham uma dire\u00e7\u00e3o consistente, tanto quanto poss\u00edvel.<br>2) Tome o componente principal de cada unidade funcional como o centro e fa\u00e7a o layout em torno dele. Os componentes devem ter uma disposi\u00e7\u00e3o uniforme, integral e compacta na placa de circuito impresso, minimizando e encurtando o cabo e a conex\u00e3o entre os componentes.<br>3. circuitos que operam em altas frequ\u00eancias, para considerar os par\u00e2metros de distribui\u00e7\u00e3o entre os componentes.Os circuitos gerais devem ser, na medida do poss\u00edvel, dispostos em paralelo, o que n\u00e3o \u00e9 apenas bonito, mas tamb\u00e9m f\u00e1cil de carregar e soldar, facilitando a produ\u00e7\u00e3o em massa.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Key_Points_for_PCB_Design\"><\/span>Pontos-chave para o projeto de PCB<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Integridade do sinal (SI)<\/strong><br>Os sinais de alta velocidade precisam considerar a correspond\u00eancia de imped\u00e2ncia para evitar reflexos e diafonia.<br>Use pares diferenciais (por exemplo, USB, LVDS) e mantenha comprimentos de alinhamento iguais. 2.<\/li>\n\n\n\n<li><strong>Integridade de energia (PI)<\/strong><br>Use decoupling capacitors (0.1\u03bcF near IC power pins).<br>As placas multicamadas podem usar planos de energia para reduzir o ru\u00eddo.<\/li>\n\n\n\n<li><strong>Compatibilidade eletromagn\u00e9tica (EMC)<\/strong><br>Evite o alinhamento em \u00e2ngulos agudos para reduzir a radia\u00e7\u00e3o de alta frequ\u00eancia.<br>Mantenha as linhas de sinal cr\u00edticas longe do rel\u00f3gio e das \u00e1reas de alta frequ\u00eancia.<\/li>\n\n\n\n<li><strong>Gerenciamento t\u00e9rmico<\/strong><br>Componentes de alta corrente (como MOSFETs, LDOs) para aumentar o dissipador de calor ou o dissipador de calor.<br>Layout razo\u00e1vel dos componentes geradores de calor para evitar superaquecimento localizado.<\/li>\n\n\n\n<li><strong>Manufaturabilidade (DFM)<\/strong><br>A largura\/espa\u00e7amento da linha atende \u00e0 capacidade de processo do fabricante de PCBs (por exemplo, largura m\u00ednima da linha de 6 mil).<br>Evite vias muito pequenas (por exemplo, abaixo de 0,3 mm pode aumentar o custo).<\/li>\n<\/ol>\n\n\n\n<p><strong>Resumir<\/strong><\/p>\n\n\n\n<p><a href=\"https:\/\/topfastpcba.com\/pt\/flexible-pcb-design-fonsiderations\/\">Projeto de PCB<\/a> \u00e9 uma parte importante da engenharia eletr\u00f4nica. Um bom projeto pode melhorar a estabilidade do circuito, reduzir o ru\u00eddo e otimizar os custos de produ\u00e7\u00e3o. O dom\u00ednio do fluxo b\u00e1sico, com foco na integridade do sinal, gerenciamento de energia e EMC, e a verifica\u00e7\u00e3o com a ajuda de ferramentas profissionais podem melhorar significativamente a qualidade do projeto de PCB.<\/p>","protected":false},"excerpt":{"rendered":"<p>O projeto de PCB \u00e9 um aspecto essencial da engenharia eletr\u00f4nica, que envolve a convers\u00e3o de esquemas de circuitos em layouts reais de placas de circuito impresso prontas para produ\u00e7\u00e3o, exigindo uma considera\u00e7\u00e3o abrangente do layout dos componentes, da integridade do sinal, da dissipa\u00e7\u00e3o de calor e da compatibilidade eletromagn\u00e9tica.<\/p>","protected":false},"author":2,"featured_media":1330,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[52,66],"class_list":["post-1324","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-pcb","tag-pcb-design"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.6 - 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