{"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\/sv\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/","title":{"rendered":"Varf\u00f6r jordas kretskort till metallchassin med resistiva kapacitiva anslutningar?"},"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\">Inneh\u00e5llsf\u00f6rteckning<\/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\/sv\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#1_Core_Objectives_of_RC_Connection\" >1. Centrala m\u00e5l f\u00f6r RC-anslutning<\/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\/sv\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#11_Electromagnetic_Compatibility_EMC_Requirements\" >1.1 Krav p\u00e5 elektromagnetisk kompatibilitet (EMC)<\/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\/sv\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#12_Safety_Protection_Requirements\" >1.2 Krav p\u00e5 s\u00e4kerhetsskydd<\/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\/sv\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#2_Key_Functions_and_Selection_of_Capacitors\" >2. Viktiga funktioner och val av kondensatorer<\/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\/sv\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#21_High-Frequency_Noise_Management\" >2.1 Hantering av h\u00f6gfrekvent buller<\/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\/sv\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#22_Hazardous_Voltage_Isolation\" >2.2 Isolering av farlig sp\u00e4nning<\/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\/sv\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#3_Resistor_Design_for_Protection_Mechanisms\" >3. Motst\u00e5ndskonstruktion f\u00f6r skyddsmekanismer<\/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\/sv\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#31_ESD_Protection\" >3.1 ESD-skydd<\/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\/sv\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#32_Current_Limiting_Protection\" >3.2 Str\u00f6mbegr\u00e4nsande skydd<\/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\/sv\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#4_Engineering_Practices_and_Test_Verification\" >4. Tekniska metoder och testverifiering<\/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\/sv\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#41_Typical_Connection_Scheme\" >4.1 Typiskt anslutningsschema<\/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\/sv\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#42_Key_Test_Items\" >4.2 Viktiga testobjekt<\/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\/sv\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#5_Industry_Applications_and_Optimization\" >5. Industriella till\u00e4mpningar och optimering<\/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\/sv\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#51_Parameter_Selection_by_Application\" >5.1 Parameterval per applikation<\/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\/sv\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#52_Reliability_Enhancement\" >5.2 F\u00f6rb\u00e4ttrad tillf\u00f6rlitlighet<\/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. Centrala m\u00e5l f\u00f6r RC-anslutning<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 Krav p\u00e5 elektromagnetisk kompatibilitet (EMC)<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>D\u00e4mpning av h\u00f6gfrekvent brus<\/strong>: Ger en l\u00e5gimpedansv\u00e4g f\u00f6r brus \u00f6ver 30 MHz (kondensatorfunktion)<\/li>\n\n<li><strong>L\u00e5gfrekvent isolering<\/strong>: Blockerar 50Hz str\u00f6mst\u00f6rningar (h\u00f6g motst\u00e5ndskarakt\u00e4ristik)<\/li>\n\n<li><strong>Typiska parametrar<\/strong>: 1-100nF\/Y-kondensator + 1-2M\u03a9 motst\u00e5nd<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"12_Safety_Protection_Requirements\"><\/span>1.2 Krav p\u00e5 s\u00e4kerhetsskydd<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>ESD-urladdning<\/strong>: Motst\u00e5nd p\u00e5 1 M\u03a9 uppfyller IEC61000-4-2-standarden (statisk urladdning p\u00e5 2 kV p\u00e5 \u226410 sekunder)<\/li>\n\n<li><strong>Kontroll av l\u00e4ckstr\u00f6m<\/strong>: Begr\u00e4nsar str\u00f6mmen till \u22640,1 mA (\u00f6verensst\u00e4mmer med UL1950)<\/li><\/ul><p>Beh\u00f6ver du professionellt st\u00f6d f\u00f6r EMC-design? <a href=\"https:\/\/www.topfastpcb.com\/sv\/contact\/\">Klicka f\u00f6r att konsultera v\u00e5rt EMC-expertteam<\/a> och f\u00e5 skr\u00e4ddarsydda l\u00f6sningar.<\/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=\"Motst\u00e5nd-kondensator-anslutning\" 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. Viktiga funktioner och val av kondensatorer<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 Hantering av h\u00f6gfrekvent buller<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Val av Y-kondensator<\/strong>:<\/li>\n\n<li>Medicintekniska produkter: Prioritera Y1-klass (8kV motst\u00e5ndssp\u00e4nning)<\/li>\n\n<li>Konsumentelektronik: Y2-klass (5kV) f\u00f6r b\u00e4ttre kostnadseffektivitet<\/li>\n\n<li><strong>Kapacitansens inverkan<\/strong>:<\/li>\n\n<li>1nF kondensator: ~3,2M\u03a9 impedans vid 50Hz (effektiv isolering)<\/li>\n\n<li>100nF kondensator: ~0,016\u03a9 impedans vid 100MHz (l\u00e5gimpedansv\u00e4g)<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"22_Hazardous_Voltage_Isolation\"><\/span>2.2 Isolering av farlig sp\u00e4nning<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>S\u00e4kerhetsstandarder<\/strong>:<\/li>\n\n<li>F\u00f6rst\u00e4rkt isolering: \u22652,5kV motst\u00e5ndssp\u00e4nning (IEC62368-1)<\/li>\n\n<li>Krypskyddsavst\u00e5nd: \u22656mm (220VAC-system)<\/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\/sv\/products\/resistors\/\">Motst\u00e5nd<\/a> Design f\u00f6r skyddsmekanismer<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 ESD-skydd<span class=\"ez-toc-section-end\"><\/span><\/h3><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Parameter<\/th><th>Standardv\u00e4rde<\/th><th>Teststandard<\/th><\/tr><\/thead><tbody><tr><td>Motst\u00e5nd<\/td><td>1M\u03a9\u00b15%<\/td><td>IEC61000-4-2<\/td><\/tr><tr><td>Urladdningstid<\/td><td>\u226410 sekunder<\/td><td>2kV kontakturladdning<\/td><\/tr><tr><td>Temp Koefficient<\/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 Str\u00f6mbegr\u00e4nsande skydd<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>N\u00e4r chassit har 1kV statisk elektricitet:<\/li>\n\n<li>Str\u00f6m vid direktanslutning: Teoretisk \u221e (farlig)<\/li>\n\n<li>1M\u03a9 motst\u00e5ndsstr\u00f6m: 1mA (s\u00e4kert omr\u00e5de)<\/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=\"Motst\u00e5nd-kondensator-anslutning\" 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. Tekniska metoder och testverifiering<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 Typiskt anslutningsschema<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 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 Viktiga testobjekt<span class=\"ez-toc-section-end\"><\/span><\/h3><ol class=\"wp-block-list\"><li><strong>T\u00e5lig sp\u00e4nningstest<\/strong>: 3kVAC\/60s (mellan GND och EGND)<\/li>\n\n<li><strong>Str\u00e5lningsemission<\/strong>: 30MHz-1GHz band (m\u00e5ste vara &lt;30dB\u03bcV\/m)<\/li>\n\n<li><strong>ESD-test<\/strong>: \u00b18kV kontakturladdning (klass A-kriterier)<\/li><\/ol><p><strong>Begr\u00e4nsat erbjudande<\/strong>:\u00a0\u00a0<a href=\"https:\/\/www.topfastpcb.com\/sv\/contact\/\" target=\"_blank\" rel=\"noreferrer noopener\">Kontakta ingenj\u00f6rer<\/a><\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Industry_Applications_and_Optimization\"><\/span>5. Industriella till\u00e4mpningar och optimering<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 Parameterval per applikation<span class=\"ez-toc-section-end\"><\/span><\/h3><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Till\u00e4mpning<\/th><th>Typ av kondensator<\/th><th>Motst\u00e5ndets v\u00e4rde<\/th><th>S\u00e4rskilda krav<\/th><\/tr><\/thead><tbody><tr><td>Medicinsk<\/td><td>Y1\/10nF<\/td><td>2M\u03a9<\/td><td>\u00d6verensst\u00e4mmelse med IEC60601-1<\/td><\/tr><tr><td>Industriell<\/td><td>Y2\/47nF<\/td><td>1M\u03a9<\/td><td>F\u00f6rb\u00e4ttrat \u00f6versp\u00e4nningsskydd<\/td><\/tr><tr><td>Konsument<\/td><td>X7R\/1nF<\/td><td>1.2M\u03a9<\/td><td>Kostnadsoptimerad<\/td><\/tr><\/tbody><\/table><\/figure><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"52_Reliability_Enhancement\"><\/span>5.2 F\u00f6rb\u00e4ttrad tillf\u00f6rlitlighet<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Avancerad l\u00f6sning<\/strong>: Parallell TVS-diod (t.ex. SMBJ15CA)<\/li>\n\n<li><strong>Optimering av layouten<\/strong>: Anv\u00e4nd 0201-paketet f\u00f6r att spara plats p\u00e5 30%-kretskortet<\/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=\"Motst\u00e5nd-kondensator-anslutning\" 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>Motst\u00e5ndskondensatoranslutningen uppn\u00e5r en balans mellan s\u00e4kerhetsisolering och EMC-prestanda genom exakt parameterutformning (1M\u03a9+100nF \u00e4r den optimala kombinationen). I den faktiska konstruktionen \u00e4r det n\u00f6dv\u00e4ndigt att g\u00f6ra en omfattande optimering baserat p\u00e5 s\u00e4kerhetsstandarder (t.ex. IEC62368), testdata och kostnadsfaktorer. Den h\u00e4r l\u00f6sningen har blivit standard inom omr\u00e5den som konsumentelektronik och medicinsk utrustning.<\/p><p><\/p>","protected":false},"excerpt":{"rendered":"<p>PCB-jord (GND) och metallchassi (EGND) \u00e4r anslutna via en motst\u00e5ndskondensatorkombination (vanligtvis ett 1M\u03a9 motst\u00e5nd parallellt med en 1-100nF kondensator) f\u00f6r att d\u00e4mpa h\u00f6gfrekvent brus, ge elektrostatiskt skydd, isolera effektfrekvenser och optimera EMC.<\/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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