{"id":3622,"date":"2025-07-14T16:09:52","date_gmt":"2025-07-14T08:09:52","guid":{"rendered":"https:\/\/www.topfastpcb.com\/?p=3622"},"modified":"2025-07-14T16:13:43","modified_gmt":"2025-07-14T08:13:43","slug":"why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections","status":"publish","type":"post","link":"https:\/\/www.topfastpcb.com\/pt\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/","title":{"rendered":"Porque \u00e9 que as placas de circuito impresso s\u00e3o ligadas \u00e0 terra ao chassis met\u00e1lico utilizando liga\u00e7\u00f5es capacitivas resistivas?"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_74 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:\/\/www.topfastpcb.com\/pt\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#1_Core_Objectives_of_RC_Connection\" >1. Objectivos principais da liga\u00e7\u00e3o RC<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.topfastpcb.com\/pt\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#11_Electromagnetic_Compatibility_EMC_Requirements\" >1.1 Requisitos de compatibilidade electromagn\u00e9tica (CEM)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.topfastpcb.com\/pt\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#12_Safety_Protection_Requirements\" >1.2 Requisitos de prote\u00e7\u00e3o de seguran\u00e7a<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.topfastpcb.com\/pt\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#2_Key_Functions_and_Selection_of_Capacitors\" >2. Principais fun\u00e7\u00f5es e sele\u00e7\u00e3o de condensadores<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.topfastpcb.com\/pt\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#21_High-Frequency_Noise_Management\" >2.1 Gest\u00e3o do ru\u00eddo de alta frequ\u00eancia<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.topfastpcb.com\/pt\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#22_Hazardous_Voltage_Isolation\" >2.2 Isolamento de tens\u00f5es perigosas<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.topfastpcb.com\/pt\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#3_Resistor_Design_for_Protection_Mechanisms\" >3. Conce\u00e7\u00e3o de resist\u00eancias para mecanismos de prote\u00e7\u00e3o<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.topfastpcb.com\/pt\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#31_ESD_Protection\" >3.1 Prote\u00e7\u00e3o ESD<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.topfastpcb.com\/pt\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#32_Current_Limiting_Protection\" >3.2 Prote\u00e7\u00e3o de limita\u00e7\u00e3o de corrente<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.topfastpcb.com\/pt\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#4_Engineering_Practices_and_Test_Verification\" >4. Pr\u00e1ticas de engenharia e verifica\u00e7\u00e3o de ensaios<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.topfastpcb.com\/pt\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#41_Typical_Connection_Scheme\" >4.1 Esquema de liga\u00e7\u00e3o t\u00edpico<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.topfastpcb.com\/pt\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#42_Key_Test_Items\" >4.2 Principais itens de teste<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.topfastpcb.com\/pt\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#5_Industry_Applications_and_Optimization\" >5. Aplica\u00e7\u00f5es e otimiza\u00e7\u00e3o na ind\u00fastria<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.topfastpcb.com\/pt\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#51_Parameter_Selection_by_Application\" >5.1 Sele\u00e7\u00e3o de par\u00e2metros por aplica\u00e7\u00e3o<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.topfastpcb.com\/pt\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#52_Reliability_Enhancement\" >5.2 Melhoria da fiabilidade<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Core_Objectives_of_RC_Connection\"><\/span>1. Objectivos principais da liga\u00e7\u00e3o RC<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"11_Electromagnetic_Compatibility_EMC_Requirements\"><\/span>1.1 Requisitos de compatibilidade electromagn\u00e9tica (CEM)<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Supress\u00e3o de ru\u00eddo de alta frequ\u00eancia<\/strong>: Fornece um caminho de baixa imped\u00e2ncia para ru\u00eddo acima de 30MHz (fun\u00e7\u00e3o de condensador)<\/li>\n\n<li><strong>Isolamento de baixa frequ\u00eancia<\/strong>: Bloqueia as interfer\u00eancias el\u00e9ctricas de 50Hz (carater\u00edstica de alta resist\u00eancia)<\/li>\n\n<li><strong>Par\u00e2metros t\u00edpicos<\/strong>: condensador de 1-100nF\/Y + resist\u00eancia de 1-2M\u03a9<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"12_Safety_Protection_Requirements\"><\/span>1.2 Requisitos de prote\u00e7\u00e3o de seguran\u00e7a<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Descarga ESD<\/strong>: A resist\u00eancia de 1M\u03a9 cumpre a norma IEC61000-4-2 (descarrega 2kV est\u00e1ticos em \u226410 segundos)<\/li>\n\n<li><strong>Controlo da corrente de fuga<\/strong>: Limita a corrente a \u22640,1mA (em conformidade com UL1950)<\/li><\/ul><p>Precisa de apoio profissional \u00e0 conce\u00e7\u00e3o EMC? <a href=\"https:\/\/www.topfastpcb.com\/pt\/contact\/\">Clique para consultar a nossa equipa de especialistas em EMC<\/a> e obter solu\u00e7\u00f5es personalizadas.<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/resistor-capacitor-connection.jpg\" alt=\"liga\u00e7\u00e3o resist\u00eancia-capacitor\" class=\"wp-image-3624\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/resistor-capacitor-connection.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/resistor-capacitor-connection-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/resistor-capacitor-connection-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Key_Functions_and_Selection_of_Capacitors\"><\/span>2. Principais fun\u00e7\u00f5es e sele\u00e7\u00e3o de condensadores<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"21_High-Frequency_Noise_Management\"><\/span>2.1 Gest\u00e3o do ru\u00eddo de alta frequ\u00eancia<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Sele\u00e7\u00e3o do condensador Y<\/strong>:<\/li>\n\n<li>Dispositivos m\u00e9dicos: Dar prioridade \u00e0 classe Y1 (tens\u00e3o de resist\u00eancia de 8kV)<\/li>\n\n<li>Eletr\u00f3nica de consumo: Classe Y2 (5kV) para um melhor desempenho em termos de custos<\/li>\n\n<li><strong>Impacto da capacit\u00e2ncia<\/strong>:<\/li>\n\n<li>Condensador de 1nF: imped\u00e2ncia de ~3,2M\u03a9 a 50Hz (isolamento efetivo)<\/li>\n\n<li>Condensador de 100nF: imped\u00e2ncia de ~0,016\u03a9 a 100MHz (caminho de baixa imped\u00e2ncia)<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"22_Hazardous_Voltage_Isolation\"><\/span>2.2 Isolamento de tens\u00f5es perigosas<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Normas de seguran\u00e7a<\/strong>:<\/li>\n\n<li>Isolamento refor\u00e7ado: \u22652,5kV de tens\u00e3o de resist\u00eancia (IEC62368-1)<\/li>\n\n<li>Dist\u00e2ncia de fuga: \u22656mm (sistemas de 220VAC)<\/li><\/ul><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Resistor_Design_for_Protection_Mechanisms\"><\/span>3. <a href=\"https:\/\/www.topfastpcb.com\/pt\/products\/resistors\/\">Resist\u00eancia<\/a> Conce\u00e7\u00e3o dos mecanismos de prote\u00e7\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"31_ESD_Protection\"><\/span>3.1 Prote\u00e7\u00e3o ESD<span class=\"ez-toc-section-end\"><\/span><\/h3><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Par\u00e2metro<\/th><th>Valor padr\u00e3o<\/th><th>Norma de ensaio<\/th><\/tr><\/thead><tbody><tr><td>Resist\u00eancia<\/td><td>1M\u03a9\u00b15%<\/td><td>IEC61000-4-2<\/td><\/tr><tr><td>Tempo de descarga<\/td><td>\u226410 segundos<\/td><td>Descarga de contacto de 2kV<\/td><\/tr><tr><td>Coeficiente de temperatura<\/td><td>\u226450ppm\/\u2103<\/td><td>JEDEC JESD22<\/td><\/tr><\/tbody><\/table><\/figure><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"32_Current_Limiting_Protection\"><\/span>3.2 Prote\u00e7\u00e3o de limita\u00e7\u00e3o de corrente<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Quando o chassis tem 1kV est\u00e1tico:<\/li>\n\n<li>Corrente de liga\u00e7\u00e3o direta: Te\u00f3rica \u221e (perigosa)<\/li>\n\n<li>Corrente da resist\u00eancia de 1M\u03a9: 1mA (intervalo seguro)<\/li><\/ul><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/resistor-capacitor-connection-1.jpg\" alt=\"liga\u00e7\u00e3o resist\u00eancia-capacitor\" class=\"wp-image-3625\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/resistor-capacitor-connection-1.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/resistor-capacitor-connection-1-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/resistor-capacitor-connection-1-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Engineering_Practices_and_Test_Verification\"><\/span>4. Pr\u00e1ticas de engenharia e verifica\u00e7\u00e3o de ensaios<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"41_Typical_Connection_Scheme\"><\/span>4.1 Esquema de liga\u00e7\u00e3o t\u00edpico<span class=\"ez-toc-section-end\"><\/span><\/h3><pre class=\"wp-block-code\"><code>PCB_GND \u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500 1M\u03a9 \u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500 EGND\n             \u2502 \u2502\n             \u2514\u2500\u2500 100nF\/Y2 \u2500\u2500\u2500\u2518  <\/code><\/pre><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"42_Key_Test_Items\"><\/span>4.2 Principais itens de teste<span class=\"ez-toc-section-end\"><\/span><\/h3><ol class=\"wp-block-list\"><li><strong>Teste de tens\u00e3o suport\u00e1vel<\/strong>: 3kVAC\/60s (entre GND e EGND)<\/li>\n\n<li><strong>Emiss\u00e3o radiada<\/strong>: Banda 30MHz-1GHz (deve ser &lt;30dB\u03bcV\/m)<\/li>\n\n<li><strong>Teste ESD<\/strong>Descarga de contacto: \u00b18kV (crit\u00e9rios de classe A)<\/li><\/ol><p><strong>Oferta limitada<\/strong>:\u00a0\u00a0<a href=\"https:\/\/www.topfastpcb.com\/pt\/contact\/\" target=\"_blank\" rel=\"noreferrer noopener\">Engenheiros de contacto<\/a><\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Industry_Applications_and_Optimization\"><\/span>5. Aplica\u00e7\u00f5es e otimiza\u00e7\u00e3o na ind\u00fastria<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"51_Parameter_Selection_by_Application\"><\/span>5.1 Sele\u00e7\u00e3o de par\u00e2metros por aplica\u00e7\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h3><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Aplica\u00e7\u00e3o<\/th><th>Tipo de condensador<\/th><th>Valor da resist\u00eancia<\/th><th>Requisitos especiais<\/th><\/tr><\/thead><tbody><tr><td>M\u00e9dico<\/td><td>Y1\/10nF<\/td><td>2M\u03a9<\/td><td>Conformidade com a norma IEC60601-1<\/td><\/tr><tr><td>Industrial<\/td><td>Y2\/47nF<\/td><td>1M\u03a9<\/td><td>Prote\u00e7\u00e3o refor\u00e7ada contra sobretens\u00f5es<\/td><\/tr><tr><td>Consumidor<\/td><td>X7R\/1nF<\/td><td>1.2M\u03a9<\/td><td>Otimiza\u00e7\u00e3o de custos<\/td><\/tr><\/tbody><\/table><\/figure><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"52_Reliability_Enhancement\"><\/span>5.2 Melhoria da fiabilidade<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Solu\u00e7\u00e3o avan\u00e7ada<\/strong>: D\u00edodo TVS paralelo (por exemplo, SMBJ15CA)<\/li>\n\n<li><strong>Otimiza\u00e7\u00e3o do layout<\/strong>: Utilizar a embalagem 0201 para poupar espa\u00e7o na placa de circuito impresso 30%<\/li><\/ul><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/resistor-capacitor-connection-2.jpg\" alt=\"liga\u00e7\u00e3o resist\u00eancia-capacitor\" class=\"wp-image-3626\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/resistor-capacitor-connection-2.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/resistor-capacitor-connection-2-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/resistor-capacitor-connection-2-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><p>A liga\u00e7\u00e3o resist\u00eancia-capacitor consegue um equil\u00edbrio entre o isolamento de seguran\u00e7a e o desempenho EMC atrav\u00e9s de uma conce\u00e7\u00e3o precisa dos par\u00e2metros (1M\u03a9+100nF \u00e9 a combina\u00e7\u00e3o ideal). Na conce\u00e7\u00e3o real, \u00e9 necess\u00e1rio otimizar de forma abrangente com base em normas de seguran\u00e7a (como a IEC62368), dados de teste e factores de custo. Esta solu\u00e7\u00e3o tornou-se uma pr\u00e1tica corrente em dom\u00ednios como a eletr\u00f3nica de consumo e o equipamento m\u00e9dico.<\/p><p><\/p>","protected":false},"excerpt":{"rendered":"<p>A terra da placa de circuito impresso (GND) e o chassis met\u00e1lico (EGND) s\u00e3o ligados atrav\u00e9s de uma combina\u00e7\u00e3o de resist\u00eancia-capacitor (normalmente uma resist\u00eancia de 1M\u03a9 em paralelo com um condensador de 1-100nF) para suprimir o ru\u00eddo de alta frequ\u00eancia, fornecer prote\u00e7\u00e3o eletrost\u00e1tica, isolar frequ\u00eancias de pot\u00eancia e otimizar a compatibilidade electromagn\u00e9tica.<\/p>","protected":false},"author":1,"featured_media":3623,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[109],"tags":[196],"class_list":["post-3622","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-faq","tag-resistor"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Why are PCBs grounded to metal chassis using resistive capacitive connections? 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