{"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\/fr\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/","title":{"rendered":"Pourquoi les cartes de circuits imprim\u00e9s sont-elles mises \u00e0 la terre sur des ch\u00e2ssis m\u00e9talliques \u00e0 l'aide de connexions capacitives r\u00e9sistives ?"},"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\">Table des mati\u00e8res<\/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\/fr\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#1_Core_Objectives_of_RC_Connection\" >1. Objectifs fondamentaux de la connexion 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\/fr\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#11_Electromagnetic_Compatibility_EMC_Requirements\" >1.1 Exigences en mati\u00e8re de compatibilit\u00e9 \u00e9lectromagn\u00e9tique (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\/fr\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#12_Safety_Protection_Requirements\" >1.2 Exigences en mati\u00e8re de protection de la s\u00e9curit\u00e9<\/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\/fr\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#2_Key_Functions_and_Selection_of_Capacitors\" >2. Fonctions cl\u00e9s et s\u00e9lection des condensateurs<\/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\/fr\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#21_High-Frequency_Noise_Management\" >2.1 Gestion du bruit \u00e0 haute fr\u00e9quence<\/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\/fr\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#22_Hazardous_Voltage_Isolation\" >2.2 Isolation des tensions dangereuses<\/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\/fr\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#3_Resistor_Design_for_Protection_Mechanisms\" >3. Conception de r\u00e9sistances pour les m\u00e9canismes de protection<\/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\/fr\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#31_ESD_Protection\" >3.1 Protection contre les d\u00e9charges \u00e9lectrostatiques<\/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\/fr\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#32_Current_Limiting_Protection\" >3.2 Protection par limitation de courant<\/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\/fr\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#4_Engineering_Practices_and_Test_Verification\" >4. Pratiques d'ing\u00e9nierie et v\u00e9rification des essais<\/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\/fr\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#41_Typical_Connection_Scheme\" >4.1 Sch\u00e9ma de connexion typique<\/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\/fr\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#42_Key_Test_Items\" >4.2 \u00c9l\u00e9ments cl\u00e9s du test<\/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\/fr\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#5_Industry_Applications_and_Optimization\" >5. Applications industrielles et optimisation<\/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\/fr\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#51_Parameter_Selection_by_Application\" >5.1 S\u00e9lection des param\u00e8tres par application<\/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\/fr\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#52_Reliability_Enhancement\" >5.2 Am\u00e9lioration de la fiabilit\u00e9<\/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. Objectifs fondamentaux de la connexion 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 Exigences en mati\u00e8re de compatibilit\u00e9 \u00e9lectromagn\u00e9tique (CEM)<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Suppression du bruit \u00e0 haute fr\u00e9quence<\/strong>: Fournit un chemin \u00e0 faible imp\u00e9dance pour le bruit au-dessus de 30 MHz (fonction de condensateur)<\/li>\n\n<li><strong>Isolation des basses fr\u00e9quences<\/strong>: Bloque les interf\u00e9rences du courant 50Hz (caract\u00e9ristique de haute r\u00e9sistance)<\/li>\n\n<li><strong>Param\u00e8tres typiques<\/strong>: Condensateur 1-100nF\/Y + r\u00e9sistance 1-2M\u03a9<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"12_Safety_Protection_Requirements\"><\/span>1.2 Exigences en mati\u00e8re de protection de la s\u00e9curit\u00e9<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>D\u00e9charge ESD<\/strong>: La r\u00e9sistance de 1M\u03a9 r\u00e9pond \u00e0 la norme IEC61000-4-2 (d\u00e9charge 2kV statique en \u226410 secondes).<\/li>\n\n<li><strong>Contr\u00f4le du courant de fuite<\/strong>: Limite le courant \u00e0 \u22640,1mA (conforme \u00e0 UL1950)<\/li><\/ul><p>Besoin d'une assistance professionnelle en mati\u00e8re de conception CEM ? <a href=\"https:\/\/www.topfastpcb.com\/fr\/contact\/\">Cliquez pour consulter notre \u00e9quipe d'experts CEM<\/a> et obtenir des solutions personnalis\u00e9es.<\/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=\"connexion r\u00e9sistance-condensateur\" 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. Fonctions cl\u00e9s et s\u00e9lection des condensateurs<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 Gestion du bruit \u00e0 haute fr\u00e9quence<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>S\u00e9lection du condensateur Y<\/strong>:<\/li>\n\n<li>Dispositifs m\u00e9dicaux : Priorit\u00e9 \u00e0 la classe Y1 (tension de r\u00e9sistance de 8kV)<\/li>\n\n<li>\u00c9lectronique grand public : Classe Y2 (5kV) pour un meilleur rapport qualit\u00e9-prix<\/li>\n\n<li><strong>Impact de la capacit\u00e9<\/strong>:<\/li>\n\n<li>Condensateur 1nF : imp\u00e9dance ~3.2M\u03a9 \u00e0 50Hz (isolation effective)<\/li>\n\n<li>Condensateur de 100nF : imp\u00e9dance de ~0,016\u03a9 \u00e0 100MHz (chemin \u00e0 faible imp\u00e9dance)<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"22_Hazardous_Voltage_Isolation\"><\/span>2.2 Isolation des tensions dangereuses<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Normes de s\u00e9curit\u00e9<\/strong>:<\/li>\n\n<li>Isolation renforc\u00e9e : tension de tenue \u22652,5kV (IEC62368-1)<\/li>\n\n<li>Distance de fuite : \u22656mm (syst\u00e8mes 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\/fr\/products\/resistors\/\">R\u00e9sistance<\/a> Conception de m\u00e9canismes de protection<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 Protection contre les d\u00e9charges \u00e9lectrostatiques<span class=\"ez-toc-section-end\"><\/span><\/h3><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Param\u00e8tres<\/th><th>Valeur standard<\/th><th>Norme d'essai<\/th><\/tr><\/thead><tbody><tr><td>R\u00e9sistance<\/td><td>1M\u03a9\u00b15%<\/td><td>IEC61000-4-2<\/td><\/tr><tr><td>Temps de d\u00e9charge<\/td><td>\u226410 secondes<\/td><td>D\u00e9charge de contact 2kV<\/td><\/tr><tr><td>Coefficient de temp\u00e9rature<\/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 Protection par limitation de courant<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Lorsque le ch\u00e2ssis a une tension statique de 1kV :<\/li>\n\n<li>Courant de connexion directe : Th\u00e9orique \u221e (dangereux)<\/li>\n\n<li>Courant de r\u00e9sistance de 1M\u03a9 : 1mA (plage de s\u00e9curit\u00e9)<\/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=\"connexion r\u00e9sistance-condensateur\" 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. Pratiques d'ing\u00e9nierie et v\u00e9rification des essais<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 Sch\u00e9ma de connexion typique<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\u2500\u2518  <\/code><\/pre><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"42_Key_Test_Items\"><\/span>4.2 \u00c9l\u00e9ments cl\u00e9s du test<span class=\"ez-toc-section-end\"><\/span><\/h3><ol class=\"wp-block-list\"><li><strong>Test de r\u00e9sistance \u00e0 la tension<\/strong>: 3kVAC\/60s (entre GND et EGND)<\/li>\n\n<li><strong>\u00c9mission par rayonnement<\/strong>: Bande 30MHz-1GHz (doit \u00eatre &lt;30dB\u03bcV\/m)<\/li>\n\n<li><strong>Test ESD<\/strong>D\u00e9charge de contact : \u00b18kV (crit\u00e8res de classe A)<\/li><\/ol><p><strong>Offre limit\u00e9e<\/strong>:\u00a0\u00a0<a href=\"https:\/\/www.topfastpcb.com\/fr\/contact\/\" target=\"_blank\" rel=\"noreferrer noopener\">Contacter les ing\u00e9nieurs<\/a><\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Industry_Applications_and_Optimization\"><\/span>5. Applications industrielles et optimisation<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 S\u00e9lection des param\u00e8tres par application<span class=\"ez-toc-section-end\"><\/span><\/h3><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Application<\/th><th>Type de condensateur<\/th><th>Valeur de la r\u00e9sistance<\/th><th>Exigences particuli\u00e8res<\/th><\/tr><\/thead><tbody><tr><td>M\u00e9dical<\/td><td>Y1\/10nF<\/td><td>2M\u03a9<\/td><td>Conformit\u00e9 \u00e0 la norme IEC60601-1<\/td><\/tr><tr><td>Industrie<\/td><td>Y2\/47nF<\/td><td>1M\u03a9<\/td><td>Protection renforc\u00e9e contre les surtensions<\/td><\/tr><tr><td>Consommateur<\/td><td>X7R\/1nF<\/td><td>1.2M\u03a9<\/td><td>Optimisation des co\u00fbts<\/td><\/tr><\/tbody><\/table><\/figure><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"52_Reliability_Enhancement\"><\/span>5.2 Am\u00e9lioration de la fiabilit\u00e9<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Solution avanc\u00e9e<\/strong>: Diode TVS parall\u00e8le (par exemple, SMBJ15CA)<\/li>\n\n<li><strong>Optimisation de la mise en page<\/strong>: Utiliser le bo\u00eetier 0201 pour \u00e9conomiser de l'espace sur le circuit imprim\u00e9 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=\"connexion r\u00e9sistance-condensateur\" 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>La connexion r\u00e9sistance-condensateur permet d'atteindre un \u00e9quilibre entre l'isolation de s\u00e9curit\u00e9 et les performances CEM gr\u00e2ce \u00e0 une conception pr\u00e9cise des param\u00e8tres (1M\u03a9+100nF est la combinaison optimale). Dans la conception r\u00e9elle, il est n\u00e9cessaire de proc\u00e9der \u00e0 une optimisation compl\u00e8te sur la base des normes de s\u00e9curit\u00e9 (telles que la norme IEC62368), des donn\u00e9es d'essai et des facteurs de co\u00fbt. Cette solution est devenue une pratique courante dans des domaines tels que l'\u00e9lectronique grand public et l'\u00e9quipement m\u00e9dical.<\/p><p><\/p>","protected":false},"excerpt":{"rendered":"<p>La masse du circuit imprim\u00e9 (GND) et le ch\u00e2ssis m\u00e9tallique (EGND) sont reli\u00e9s par une combinaison r\u00e9sistance-condensateur (typiquement une r\u00e9sistance de 1M\u03a9 en parall\u00e8le avec un condensateur de 1-100nF) pour supprimer le bruit \u00e0 haute fr\u00e9quence, fournir une protection \u00e9lectrostatique, isoler les fr\u00e9quences d'alimentation et optimiser la CEM.<\/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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