{"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\/it\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/","title":{"rendered":"Perch\u00e9 i circuiti stampati sono collegati a terra ai telai metallici utilizzando connessioni capacitive resistive?"},"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\">Indice per materie<\/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\/it\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#1_Core_Objectives_of_RC_Connection\" >1. Obiettivi principali di RC Connection<\/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\/it\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#11_Electromagnetic_Compatibility_EMC_Requirements\" >1.1 Requisiti di compatibilit\u00e0 elettromagnetica (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\/it\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#12_Safety_Protection_Requirements\" >1.2 Requisiti di protezione della sicurezza<\/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\/it\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#2_Key_Functions_and_Selection_of_Capacitors\" >2. Funzioni chiave e selezione dei condensatori<\/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\/it\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#21_High-Frequency_Noise_Management\" >2.1 Gestione del rumore ad alta frequenza<\/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\/it\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#22_Hazardous_Voltage_Isolation\" >2.2 Isolamento da tensioni pericolose<\/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\/it\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#3_Resistor_Design_for_Protection_Mechanisms\" >3. Progettazione dei resistori per i meccanismi di protezione<\/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\/it\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#31_ESD_Protection\" >3.1 Protezione 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\/it\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#32_Current_Limiting_Protection\" >3.2 Protezione con limitazione di 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\/it\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#4_Engineering_Practices_and_Test_Verification\" >4. Pratiche ingegneristiche e verifica dei test<\/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\/it\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#41_Typical_Connection_Scheme\" >4.1 Schema di collegamento tipico<\/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\/it\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#42_Key_Test_Items\" >4.2 Elementi chiave del 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\/it\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#5_Industry_Applications_and_Optimization\" >5. Applicazioni industriali e ottimizzazione<\/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\/it\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#51_Parameter_Selection_by_Application\" >5.1 Selezione dei parametri per applicazione<\/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\/it\/blog\/why-are-pcbs-grounded-to-metal-chassis-using-resistive-capacitive-connections\/#52_Reliability_Enhancement\" >5.2 Miglioramento dell'affidabilit\u00e0<\/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. Obiettivi principali di RC Connection<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 Requisiti di compatibilit\u00e0 elettromagnetica (EMC)<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Soppressione del rumore ad alta frequenza<\/strong>: Fornisce un percorso a bassa impedenza per il rumore al di sopra dei 30 MHz (funzione condensatore).<\/li>\n\n<li><strong>Isolamento a bassa frequenza<\/strong>: Blocca le interferenze di potenza a 50Hz (caratteristica di alta resistenza)<\/li>\n\n<li><strong>Parametri tipici<\/strong>: condensatore 1-100nF\/Y + resistenza 1-2M\u03a9<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"12_Safety_Protection_Requirements\"><\/span>1.2 Requisiti di protezione della sicurezza<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Scarico ESD<\/strong>: La resistenza da 1M\u03a9 soddisfa lo standard IEC61000-4-2 (scarica 2kV statici in \u226410 secondi).<\/li>\n\n<li><strong>Controllo della corrente di dispersione<\/strong>: Limita la corrente a \u22640,1mA (conforme a UL1950)<\/li><\/ul><p>Avete bisogno di un supporto professionale per la progettazione EMC? <a href=\"https:\/\/www.topfastpcb.com\/it\/contact\/\">Clicca per consultare il nostro team di esperti EMC<\/a> e ottenere soluzioni personalizzate.<\/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=\"collegamento resistenza-capacitore\" 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. Funzioni chiave e selezione dei condensatori<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 Gestione del rumore ad alta frequenza<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Selezione del condensatore Y<\/strong>:<\/li>\n\n<li>Dispositivi medici: Privilegiare la classe Y1 (tensione di resistenza 8kV)<\/li>\n\n<li>Elettronica di consumo: Classe Y2 (5kV) per una migliore performance di costo<\/li>\n\n<li><strong>Impatto della capacit\u00e0<\/strong>:<\/li>\n\n<li>Condensatore da 1nF: impedenza di ~3,2M\u03a9 a 50Hz (isolamento effettivo)<\/li>\n\n<li>Condensatore da 100nF: impedenza di ~0,016\u03a9 a 100MHz (percorso a bassa impedenza)<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"22_Hazardous_Voltage_Isolation\"><\/span>2.2 Isolamento da tensioni pericolose<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Standard di sicurezza<\/strong>:<\/li>\n\n<li>Isolamento rinforzato: tensione di tenuta \u22652,5kV (IEC62368-1)<\/li>\n\n<li>Distanza di dispersione: \u22656mm (sistemi a 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\/it\/products\/resistors\/\">resistore<\/a> Progettazione di meccanismi di protezione<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 Protezione ESD<span class=\"ez-toc-section-end\"><\/span><\/h3><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>parametro<\/th><th>Valore standard<\/th><th>Standard di prova<\/th><\/tr><\/thead><tbody><tr><td>Resistenza<\/td><td>1M\u03a9\u00b15%<\/td><td>IEC61000-4-2<\/td><\/tr><tr><td>Tempo di scarico<\/td><td>\u226410 secondi<\/td><td>Scarica di contatto a 2kV<\/td><\/tr><tr><td>Coefficiente di 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 Protezione con limitazione di corrente<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Quando il telaio ha 1kV statico:<\/li>\n\n<li>Corrente di collegamento diretta: teorica \u221e (pericolosa)<\/li>\n\n<li>Corrente del resistore da 1M\u03a9: 1mA (intervallo di sicurezza)<\/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=\"collegamento resistenza-capacitore\" 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. Pratiche ingegneristiche e verifica dei test<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 Schema di collegamento tipico<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 Elementi chiave del test<span class=\"ez-toc-section-end\"><\/span><\/h3><ol class=\"wp-block-list\"><li><strong>Test di resistenza alla tensione<\/strong>: 3kVAC\/60s (tra GND e EGND)<\/li>\n\n<li><strong>Emissione irradiata<\/strong>: Banda 30MHz-1GHz (deve essere &lt;30dB\u03bcV\/m)<\/li>\n\n<li><strong>Test ESD<\/strong>: Scariche di contatto a \u00b18kV (criteri di Classe A)<\/li><\/ol><p><strong>Offerta limitata<\/strong>:\u00a0\u00a0<a href=\"https:\/\/www.topfastpcb.com\/it\/contact\/\" target=\"_blank\" rel=\"noreferrer noopener\">Contatto Ingegneri<\/a><\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Industry_Applications_and_Optimization\"><\/span>5. Applicazioni industriali e ottimizzazione<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 Selezione dei parametri per applicazione<span class=\"ez-toc-section-end\"><\/span><\/h3><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>domanda<\/th><th>Tipo di condensatore<\/th><th>Valore del resistore<\/th><th>Requisiti speciali<\/th><\/tr><\/thead><tbody><tr><td>Medico<\/td><td>Y1\/10nF<\/td><td>2M\u03a9<\/td><td>Conformit\u00e0 alla norma IEC60601-1<\/td><\/tr><tr><td>Industriale<\/td><td>Y2\/47nF<\/td><td>1M\u03a9<\/td><td>Protezione dalle sovratensioni migliorata<\/td><\/tr><tr><td>Consumatore<\/td><td>X7R\/1nF<\/td><td>1,2M\u03a9<\/td><td>Ottimizzazione dei costi<\/td><\/tr><\/tbody><\/table><\/figure><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"52_Reliability_Enhancement\"><\/span>5.2 Miglioramento dell'affidabilit\u00e0<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Soluzione avanzata<\/strong>: Diodo TVS parallelo (ad es., SMBJ15CA)<\/li>\n\n<li><strong>Ottimizzazione del layout<\/strong>: Utilizzare il pacchetto 0201 per risparmiare spazio sul PCB 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=\"collegamento resistenza-capacitore\" 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>Il collegamento resistenza-condensatore raggiunge un equilibrio tra isolamento di sicurezza e prestazioni EMC attraverso una progettazione precisa dei parametri (1M\u03a9+100nF \u00e8 la combinazione ottimale). Nella progettazione effettiva, \u00e8 necessario ottimizzare in modo completo in base agli standard di sicurezza (come IEC62368), ai dati di test e ai fattori di costo. Questa soluzione \u00e8 diventata una pratica standard in settori come l'elettronica di consumo e le apparecchiature mediche.<\/p><p><\/p>","protected":false},"excerpt":{"rendered":"<p>La messa a terra del circuito stampato (GND) e il telaio metallico (EGND) sono collegati tramite una combinazione di resistore-condensatore (in genere un resistore da 1M\u03a9 in parallelo con un condensatore da 1-100nF) per sopprimere il rumore ad alta frequenza, fornire protezione elettrostatica, isolare le frequenze di alimentazione e ottimizzare la compatibilit\u00e0 elettromagnetica.<\/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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