{"id":3387,"date":"2025-06-23T08:15:00","date_gmt":"2025-06-23T00:15:00","guid":{"rendered":"https:\/\/www.topfastpcb.com\/?p=3387"},"modified":"2025-06-20T17:45:52","modified_gmt":"2025-06-20T09:45:52","slug":"will-too-many-components-on-a-pcb-cause-overload","status":"publish","type":"post","link":"https:\/\/www.topfastpcb.com\/fr\/blog\/will-too-many-components-on-a-pcb-cause-overload\/","title":{"rendered":"Un trop grand nombre de composants sur un circuit imprim\u00e9 peut-il entra\u00eener une surcharge ?"},"content":{"rendered":"<p>Lorsqu'il y a trop de composants sur une carte de circuit imprim\u00e9, cela peut conduire \u00e0 une surcharge, ce qui peut avoir des effets n\u00e9fastes tels qu'une d\u00e9gradation des performances \u00e9lectriques et une r\u00e9duction de la dissipation de la chaleur. Par cons\u00e9quent, lorsqu'il y a beaucoup de composants sur un <a href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/printed-circuit-board-pcb\/\">Carte PCB<\/a>Comment d\u00e9terminer si le circuit imprim\u00e9 est surcharg\u00e9 ?<\/p><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\/will-too-many-components-on-a-pcb-cause-overload\/#Methods_for_Determining_PCB_Overloading\" >M\u00e9thodes de d\u00e9termination de la surcharge en PCB<\/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\/will-too-many-components-on-a-pcb-cause-overload\/#1_Current_Parameter_Testing\" >1. Test des param\u00e8tres de courant<\/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\/will-too-many-components-on-a-pcb-cause-overload\/#2_Temperature_Rise_Characteristic_Analysis\" >2.Analyse des caract\u00e9ristiques de l'\u00e9l\u00e9vation de la temp\u00e9rature<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/will-too-many-components-on-a-pcb-cause-overload\/#3_Load_capacity_verification\" >3.V\u00e9rification de la capacit\u00e9 de charge<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/will-too-many-components-on-a-pcb-cause-overload\/#4_Physical_Condition_Diagnosis\" >4.Diagnostic de l'\u00e9tat physique<\/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\/will-too-many-components-on-a-pcb-cause-overload\/#5_Design_specification_verification\" >5.V\u00e9rification des sp\u00e9cifications de conception<\/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\/will-too-many-components-on-a-pcb-cause-overload\/#Effects_of_Overload_on_PCBs\" >Effets de la surcharge sur les PCB<\/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\/will-too-many-components-on-a-pcb-cause-overload\/#1_Triple_Destruction_Mechanism_of_Electrical_Performance\" >1. M\u00e9canisme de triple destruction de la performance \u00e9lectrique<\/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\/will-too-many-components-on-a-pcb-cause-overload\/#2_Thermodynamic_failure_spectrum\" >2.Spectre de d\u00e9faillance thermodynamique<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/will-too-many-components-on-a-pcb-cause-overload\/#3_System-level_risk_matrix\" >3.Matrice des risques au niveau du syst\u00e8me<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/will-too-many-components-on-a-pcb-cause-overload\/#PCB_Overload_System_Solution_Four-Dimensional_Optimization_System\" >Solution pour le syst\u00e8me de surcharge des circuits imprim\u00e9s (syst\u00e8me d'optimisation quadridimensionnel)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/will-too-many-components-on-a-pcb-cause-overload\/#1_Electrical_Performance_Enhancement_Solution\" >1. Solution d'am\u00e9lioration des performances \u00e9lectriques<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/will-too-many-components-on-a-pcb-cause-overload\/#2_Intelligent_thermal_management_solution\" >2.Solution intelligente de gestion thermique<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/will-too-many-components-on-a-pcb-cause-overload\/#3_High-Density_Layout_Strategy\" >3.Strat\u00e9gie d'implantation \u00e0 haute densit\u00e9<\/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\/will-too-many-components-on-a-pcb-cause-overload\/#4_Advanced_process_solutions\" >4.Solutions de traitement avanc\u00e9es<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/will-too-many-components-on-a-pcb-cause-overload\/#PCB_Overload_Protection_Plan\" >Plan de protection contre les surcharges des PCB<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/will-too-many-components-on-a-pcb-cause-overload\/#1_Protection_Strategy_in_the_Design_Stage\" >1. Strat\u00e9gie de protection au stade de la conception<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/will-too-many-components-on-a-pcb-cause-overload\/#2_Advanced_Manufacturing_Processes\" >2.Proc\u00e9d\u00e9s de fabrication avanc\u00e9s<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/will-too-many-components-on-a-pcb-cause-overload\/#3_Testing_and_Monitoring_System\" >3.Syst\u00e8me d'essai et de contr\u00f4le<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/will-too-many-components-on-a-pcb-cause-overload\/#4_Key_Design_Specifications\" >4.Principales sp\u00e9cifications de conception<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/will-too-many-components-on-a-pcb-cause-overload\/#5_High-reliability_solutions\" >5.Solutions \u00e0 haute fiabilit\u00e9<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/will-too-many-components-on-a-pcb-cause-overload\/#Summary\" >R\u00e9sum\u00e9<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Methods_for_Determining_PCB_Overloading\"><\/span>M\u00e9thodes de d\u00e9termination de la surcharge en PCB<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Current_Parameter_Testing\"><\/span>1. Test des param\u00e8tres de courant<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Utiliser une pince de mesure de haute pr\u00e9cision pour mesurer le courant de fonctionnement des circuits critiques.<\/li>\n\n<li>Comparer avec les param\u00e8tres de conception :<br>- Les conducteurs conventionnels de 1,5 mm\u00b2 ont un courant nominal de s\u00e9curit\u00e9 de 16 A (\u00e0 une temp\u00e9rature ambiante de 30 \u00b0C).<br>- La largeur de ligne de 100 mils\/l'\u00e9paisseur de cuivre de 1 oz a une intensit\u00e9 maximale de 4,5 A (sur la base d'une norme d'\u00e9l\u00e9vation de temp\u00e9rature de 10 \u00b0C).<\/li>\n\n<li>Crit\u00e8res de d\u00e9termination : Si le courant mesur\u00e9 est \u226580% de la valeur de conception, un avertissement est requis.<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Temperature_Rise_Characteristic_Analysis\"><\/span>2.Analyse des caract\u00e9ristiques de l'\u00e9l\u00e9vation de la temp\u00e9rature<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Outil de test :Imageur thermique infrarouge (r\u00e9solution \u2264 0,1\u00b0C)<\/li>\n\n<li>Seuils de s\u00e9curit\u00e9 :<br>- Mat\u00e9riau isolant en PVC : Temp\u00e9rature du conducteur \u2264 70\u00b0C<br>- Substrat FR-4 :Augmentation locale de la temp\u00e9rature \u2264 20\u00b0C (par rapport \u00e0 la temp\u00e9rature ambiante)<\/li>\n\n<li>Indicateurs anormaux :D\u00e9coloration\/adoucissement de la couche d'isolation, d\u00e9formation du joint de soudure<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Load_capacity_verification\"><\/span>3.V\u00e9rification de la capacit\u00e9 de charge<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Formule de calcul :I = Kx - P \/ (U - cos\u03c6)<br>(Kx pris comme 0,7-0,8, cos\u03c6 recommand\u00e9 comme 0,85)<\/li>\n\n<li>Exemple de v\u00e9rification :<br>220V\/3500W calcul du courant de charge r\u00e9sistive \u2248 : 15.9A<br>N\u00e9cessite un fil de 2,5 mm\u00b2 correspondant (marge de conception de 20 %)<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Physical_Condition_Diagnosis\"><\/span>4.Diagnostic de l'\u00e9tat physique<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Caract\u00e9ristiques typiques d'un d\u00e9faut :<br>- D\u00e9collement de la feuille de cuivre (la contrainte de cisaillement d\u00e9passe la limite)<br>- Marques de carbonisation (temp\u00e9rature \u00e9lev\u00e9e localis\u00e9e &gt; 300\u00b0C)<br>- Fonctionnement anormal des dispositifs de protection (\u22653 d\u00e9clenchements en 24 heures)<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Design_specification_verification\"><\/span>5.V\u00e9rification des sp\u00e9cifications de conception<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Tableau de correspondance des param\u00e8tres cl\u00e9s :<\/p><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Exigence actuelle<\/th><th>Exigences en mati\u00e8re d'\u00e9paisseur de cuivre<\/th><th>Largeur minimale de la ligne<\/th><th>Mesures compl\u00e9mentaires<\/th><\/tr><\/thead><tbody><tr><td>\uff1c5A<\/td><td>1OZ<\/td><td>20 millions<\/td><td>Routage sur une seule face<\/td><\/tr><tr><td>5-20A<\/td><td>2OZ<\/td><td>80 millions<\/td><td>Ajouter des fen\u00eatres<\/td><\/tr><tr><td>\uff1e100A<\/td><td>4OZ<\/td><td>15 mm<\/td><td>Assistance aux barres de cuivre<\/td><\/tr><\/tbody><\/table><\/figure><p>Donner la priorit\u00e9 \u00e0 l'examen rapide par la mesure du courant et la surveillance de la temp\u00e9rature, combin\u00e9es au calcul de la charge et \u00e0 la v\u00e9rification crois\u00e9e de l'inspection physique. Pour les circuits imprim\u00e9s de forte puissance, il convient de s\u00e9lectionner strictement la largeur des lignes et l'\u00e9paisseur du cuivre en fonction du tableau de capacit\u00e9 de transport de courant d\u00e8s le d\u00e9but de la phase de conception, et de pr\u00e9voir une marge pour la dissipation de la chaleur. Quelles sont les cons\u00e9quences d'une surcharge sur la carte de circuit imprim\u00e9 ?<\/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\/06\/pcb1.jpg\" alt=\"PCB\" class=\"wp-image-3388\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/06\/pcb1.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/06\/pcb1-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/06\/pcb1-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Effects_of_Overload_on_PCBs\"><\/span>Effets de la surcharge sur les PCB<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Triple_Destruction_Mechanism_of_Electrical_Performance\"><\/span>1. M\u00e9canisme de triple destruction de la performance \u00e9lectrique<span class=\"ez-toc-section-end\"><\/span><\/h3><ol class=\"wp-block-list\"><li><strong>Effet d'instabilit\u00e9 de l'imp\u00e9dance<\/strong><br>Augmentation significative de la r\u00e9sistance du fil : \u0394R = \u03c1 - L - (1\/S\u2081 &amp;#8211 ; 1\/S\u2082) (S est la variation de la section transversale)<br>Cas typique : La surcharge des lignes \u00e9lectriques entra\u00eene une fluctuation de \u00b115 % de la tension d'alimentation du MCU, ce qui d\u00e9clenche la r\u00e9initialisation du syst\u00e8me (donn\u00e9es de mesure r\u00e9elles).<\/li>\n\n<li><strong>Effondrement de l'int\u00e9grit\u00e9 du signal<\/strong><br>Mesures de d\u00e9gradation des signaux \u00e0 grande vitesse :<br>Fermeture du diagramme oculaire &gt; 30<br>Temps de propagation \u2265 50 ps<br>Rapport signal\/bruit &gt; -12 dB<\/li>\n\n<li><strong>Le rayonnement de 3EMI d\u00e9passe les normes<\/strong><br>Les niveaux de cr\u00eate des interf\u00e9rences \u00e9lectromagn\u00e9tiques sur les lignes surcharg\u00e9es augmentent de 20 \u00e0 35 dB\u03bcV\/m.<br>Exemple de d\u00e9gradation du rapport signal\/bruit dans les circuits sensibles :<br>Le taux d'erreur d'\u00e9chantillonnage de l'ADC audio passe de 0,1 % \u00e0 3,2 %.<\/li><\/ol><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Thermodynamic_failure_spectrum\"><\/span>2.Spectre de d\u00e9faillance thermodynamique<span class=\"ez-toc-section-end\"><\/span><\/h3><ol class=\"wp-block-list\"><li><strong>Seuils de dommages mat\u00e9riels<\/strong> Type de mat\u00e9riau Temp\u00e9rature critique Mode de d\u00e9faillance Substrat FR-4 130\u00b0C D\u00e9lamination et fissuration Feuille de cuivre 1 oz 260\u00b0C Fusion et d\u00e9formation Soudure plomb-\u00e9tain 183\u00b0C Migration de liquide Encre du masque de soudure 70\u00b0C Carbonisation et d\u00e9collement<\/li>\n\n<li><strong>Cha\u00eene de d\u00e9faillance thermique typique<\/strong><br>Surintensit\u00e9 \u2192 Augmentation de la temp\u00e9rature locale &gt; 85\u00b0C \u2192 Fluage du joint de soudure \u2192 Augmentation de la r\u00e9sistance de contact \u2192 Emballement thermique (boucle de r\u00e9troaction positive)<\/li><\/ol><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_System-level_risk_matrix\"><\/span>3.Matrice des risques au niveau du syst\u00e8me<span class=\"ez-toc-section-end\"><\/span><\/h3><ol class=\"wp-block-list\"><li><strong>Distribution des probabilit\u00e9s de d\u00e9faillance<\/strong><br>Module d'alimentation : 68%<br>Interface d'alimentation : 22%<br>Lignes de signaux : 10%<\/li>\n\n<li><strong>Mod\u00e8le de dommages secondaires<\/strong><br>Rayon d'influence du rayonnement thermique : R = 3,5 - \u221aP (P est la puissance de production de chaleur, unit\u00e9 : W)<br>Cas :Une source de chaleur de 10W provoque une d\u00e9rive de capacit\u00e9 de \u00b115% dans un rayon de 3cm du MLCC.<\/li><\/ol><div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-1 wp-block-buttons-is-layout-flex\"><div class=\"wp-block-button\"><a class=\"wp-block-button__link has-white-color has-vivid-green-cyan-background-color has-text-color has-background has-link-color wp-element-button\" href=\"https:\/\/www.topfastpcb.com\/fr\/contact\/\">Consulter un fabricant de circuits imprim\u00e9s fiable<\/a><\/div><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"PCB_Overload_System_Solution_Four-Dimensional_Optimization_System\"><\/span>Solution pour le syst\u00e8me de surcharge des circuits imprim\u00e9s (syst\u00e8me d'optimisation quadridimensionnel)<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Electrical_Performance_Enhancement_Solution\"><\/span>1. Solution d'am\u00e9lioration des performances \u00e9lectriques<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Capacit\u00e9 de charge actuelle Am\u00e9lioration<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Optimisation de la couche de cuivre : Cuivre d'une \u00e9paisseur de 4OZ + c\u00e2blage double face de 15 mm de large (solution de niveau 100A)<\/li>\n\n<li>Processus am\u00e9lior\u00e9s :<br>\u00c9tamage des conducteurs par ouverture de fen\u00eatre (am\u00e9lioration de 40 % de la capacit\u00e9 de transport de courant)<br>Partage du courant auxiliaire du jeu de barres en cuivre (cas d'application industrielle de 200 A)<\/li><\/ul><ul class=\"wp-block-list\"><li><strong>Technologie de contr\u00f4le de l'imp\u00e9dance<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Couche de puissance avec plan de cuivre complet (imp\u00e9dance &amp;lt ; 5m\u03a9)<\/li>\n\n<li>Matrice via r\u00e9seau (12mil via groupe partageant un courant de 20A)<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Intelligent_thermal_management_solution\"><\/span>2.Solution intelligente de gestion thermique<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Conception de la structure de dissipation de la chaleur<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Configuration des composants \u00e0 haute temp\u00e9rature (\uff1e5W) :<br>Groupe de trous de dissipation thermique par le bas (\u03a60,3mm\u00d750 trous)<br>Disposition des bords de la carte + dissipateur thermique en alliage d'aluminium (60% de baisse de temp\u00e9rature)<\/li><\/ul><ul class=\"wp-block-list\"><li><strong>Sp\u00e9cifications de l'agencement thermique<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Sensibilit\u00e9 thermique espacement des composants \u22658mm<\/li>\n\n<li>Distribution uniforme des sources de chaleur (contr\u00f4le de la diff\u00e9rence de temp\u00e9rature &lt;15\u00b0C)<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_High-Density_Layout_Strategy\"><\/span>3.Strat\u00e9gie d'implantation \u00e0 haute densit\u00e9<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Conception de l'int\u00e9grit\u00e9 des signaux<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Isolation de la couche num\u00e9rique\/analogique (blindage interm\u00e9diaire de la couche GND)<\/li>\n\n<li>Signaux \u00e0 grande vitesse :<br>Contr\u00f4le de l'\u00e9galit\u00e9 de longueur (\u00b150 mil)<br>Disposition sym\u00e9trique des composants RF (r\u00e9duction du bruit de 12 dB pour les modules 5G)<\/li><\/ul><ul class=\"wp-block-list\"><li><strong>Solution d'isolation haute tension<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Zones de &gt;50V :<br>Espace de s\u00e9curit\u00e9 de 15 mm<br>Isolation des fentes de 2 mm<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Advanced_process_solutions\"><\/span>4.Solutions de traitement avanc\u00e9es<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Proc\u00e9d\u00e9 sp\u00e9cial de laminage<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Structure sandwich de couches de cuivre (couche de cuivre encastr\u00e9e de 1,5 mm)<\/li>\n\n<li>Application de mat\u00e9riaux pour cartes \u00e0 haute fr\u00e9quence (Rogers 4350B@1GHz+)<\/li><\/ul><ul class=\"wp-block-list\"><li><strong>Syst\u00e8me de v\u00e9rification<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Simulation thermique (\u0394T &amp;lt ; 15\u00b0C\/cm)<\/li>\n\n<li>Test de signal (fluctuation de l'imp\u00e9dance TDR \u2264 10%)<\/li>\n\n<li>Normes DFM (largeur de ligne\/espacement \u2265 4 mil)<\/li><\/ul><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Phase d'optimisation<\/th><th>Indicateurs techniques cl\u00e9s<\/th><\/tr><\/thead><tbody><tr><td>1. Les bases de la capacit\u00e9 actuelle<\/td><td>\u00c9paisseur du cuivre \u22654OZ + Largeur de la trace \u226515mm<\/td><\/tr><tr><td>2. Gestion thermique<\/td><td>R\u00e9duction de la temp\u00e9rature des composants cl\u00e9s \u226530%<\/td><\/tr><tr><td>3. Optimisation du signal<\/td><td>R\u00e9duction de la diaphonie 12dB<\/td><\/tr><tr><td>4. Mise \u00e0 niveau du processus<\/td><td>Am\u00e9lioration du taux de rendement de 27<\/td><\/tr><\/tbody><\/table><\/figure><p>Note : Apr\u00e8s avoir appliqu\u00e9 cette solution \u00e0 un module de station de base 5G, les r\u00e9sultats suivants ont \u00e9t\u00e9 obtenus :<\/p><ul class=\"wp-block-list\"><li>Augmentation de 300 % de la capacit\u00e9 de transport de courant continu<\/li>\n\n<li>Le taux de d\u00e9faillance thermique a diminu\u00e9 de 82 %.<\/li>\n\n<li>Le taux de conformit\u00e9 de l'int\u00e9grit\u00e9 du signal a atteint 100 %.<\/li><\/ul><p>Quelles sont les mesures \u00e0 prendre pour \u00e9viter la surcharge des circuits imprim\u00e9s ? La pr\u00e9vention de la surcharge des circuits imprim\u00e9s n\u00e9cessite un contr\u00f4le collaboratif tout au long du processus de conception, de fabrication et d'essai.<\/p><div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-2 wp-block-buttons-is-layout-flex\"><div class=\"wp-block-button\"><a class=\"wp-block-button__link has-white-color has-vivid-green-cyan-background-color has-text-color has-background has-link-color wp-element-button\" href=\"https:\/\/www.topfastpcb.com\/fr\/contact\/\">Comment pr\u00e9venir la surcharge des PCB, consulter imm\u00e9diatement<\/a><\/div><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"PCB_Overload_Protection_Plan\"><\/span>Plan de protection contre les surcharges des PCB<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Protection_Strategy_in_the_Design_Stage\"><\/span>1. Strat\u00e9gie de protection au stade de la conception<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Conception pr\u00e9cise de la capacit\u00e9 de charge actuelle<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Norme de calcul de la capacit\u00e9 d'accueil actuelle :<br>math\u00e9matiques<br>I_{max} = K \\cdot \\Delta T^{0.44} \\cdot W^{0.725}<br>(K=0,048, \u0394T est l'augmentation de temp\u00e9rature admissible, W est la largeur de la ligne en milli\u00e8mes)<\/li>\n\n<li>Sch\u00e9mas de configuration typiques :<ul class=\"wp-block-list\"><li>Applications conventionnelles : 2OZ \u00e9paisseur de cuivre + 100mil largeur de ligne (classe 10A)<\/li>\n\n<li>Sch\u00e9mas \u00e0 courant \u00e9lev\u00e9 :Epaisseur de cuivre 4OZ + traces double face 15mm + barres omnibus en cuivre (classe 100A)<\/li><\/ul><\/li><\/ul><ul class=\"wp-block-list\"><li><strong>Conception de l'int\u00e9grit\u00e9 de l'alimentation<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Matrice des condensateurs de d\u00e9couplage :<ul class=\"wp-block-list\"><li>Bande haute fr\u00e9quence : 0402 Condensateur c\u00e9ramique 10nF (ESL &amp;lt ; 0,5nH)<\/li>\n\n<li>Bande de fr\u00e9quences moyennes : condensateur 0603 100nF<\/li>\n\n<li>Bande basse fr\u00e9quence : 1206 condensateur au tantale de 10\u03bcF.<\/li><\/ul><\/li><\/ul><ul class=\"wp-block-list\"><li><strong>Gestion thermique am\u00e9lior\u00e9e<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Sp\u00e9cifications des r\u00e9seaux de trous de dissipation de chaleur :<ul class=\"wp-block-list\"><li>Diam\u00e8tre du trou : \u03a60.3mm<\/li>\n\n<li>Distance centrale :0,8 mm<\/li>\n\n<li>Disposition en nid d'abeille (am\u00e9lioration de 35 % de l'efficacit\u00e9 de la dissipation thermique)<\/li><\/ul><\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Advanced_Manufacturing_Processes\"><\/span>2.Proc\u00e9d\u00e9s de fabrication avanc\u00e9s<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Technologies de traitement sp\u00e9cial<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Processus \u00e0 forte capacit\u00e9 de transport de courant :<ul class=\"wp-block-list\"><li>Remplissage en cuivre VIPPO (r\u00e9duction de 40 % de la r\u00e9sistance de contact)<\/li>\n\n<li>\u00c9paisseur de cuivre s\u00e9lective (\u00e9paississement de 4OZ dans certaines zones)<\/li><\/ul><\/li><\/ul><ul class=\"wp-block-list\"><li><strong>Syst\u00e8me de protection<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><\/ul><ul class=\"wp-block-list\"><li>Param\u00e8tres du processus de rev\u00eatement \u00e0 trois \u00e9preuves :<\/li><\/ul><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Type de rev\u00eatement<\/th><th>\u00c9paisseur<\/th><th>Temp. R\u00e9sistance<\/th><th>Essai au brouillard salin<\/th><th>Caract\u00e9ristiques principales<\/th><\/tr><\/thead><tbody><tr><td>Silicone<\/td><td>0,1 mm<\/td><td>200\u00b0C<\/td><td>1000 heures<\/td><td>Grande flexibilit\u00e9, excellente r\u00e9sistance \u00e0 l'humidit\u00e9<\/td><\/tr><tr><td>Polyur\u00e9thane<\/td><td>0,15 mm<\/td><td>130\u00b0C<\/td><td>500 heures<\/td><td>R\u00e9sistance sup\u00e9rieure \u00e0 l'abrasion, bonne protection chimique<\/td><\/tr><\/tbody><\/table><\/figure><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Testing_and_Monitoring_System\"><\/span>3.Syst\u00e8me d'essai et de contr\u00f4le<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Normes de test de production<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Items du test TIC :<ul class=\"wp-block-list\"><li>Test d'imp\u00e9dance (tol\u00e9rance de \u00b15%)<\/li>\n\n<li>R\u00e9sistance d'isolation (\u2265100M\u03a9)<\/li>\n\n<li>Test de r\u00e9sistance \u00e0 la tension (500V DC\/60s)<\/li><\/ul><\/li><\/ul><ul class=\"wp-block-list\"><li><strong>Syst\u00e8me de surveillance intelligent<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Param\u00e8tres de surveillance en temps r\u00e9el :<ul class=\"wp-block-list\"><li>Densit\u00e9 de courant (\u22644A\/mm\u00b2)<\/li>\n\n<li>Temp\u00e9rature du point chaud (\u226485\u2103)<\/li>\n\n<li>Spectre de vibration (&lt;5g RMS)<\/li><\/ul><\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Key_Design_Specifications\"><\/span>4.Principales sp\u00e9cifications de conception<span class=\"ez-toc-section-end\"><\/span><\/h3><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Valeur nominale actuelle<\/th><th>\u00c9paisseur du cuivre<\/th><th>Min. Largeur de la trace<\/th><th>Augmentation maximale de la temp\u00e9rature<\/th><th>Recommandations en mati\u00e8re de conception<\/th><\/tr><\/thead><tbody><tr><td>\u22645A<\/td><td>1 oz (35\u03bcm)<\/td><td>50 mil (1,27 mm)<\/td><td>\u226410\u00b0C<\/td><td>Routage \u00e0 couche unique<\/td><\/tr><tr><td>20A<\/td><td>2 oz (70\u03bcm)<\/td><td>3mm<\/td><td>\u226415\u00b0C<\/td><td>Thermique via r\u00e9seau<\/td><\/tr><tr><td>100A+<\/td><td>4 oz (140\u03bcm)<\/td><td>15 mm<\/td><td>\u226420\u00b0C<\/td><td>Barre omnibus en cuivre avec refroidissement liquide<\/td><\/tr><\/tbody><\/table><\/figure><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_High-reliability_solutions\"><\/span>5.Solutions \u00e0 haute fiabilit\u00e9<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Protection de qualit\u00e9 militaire<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Conception stratifi\u00e9e sym\u00e9trique (\u00e9cart d'imp\u00e9dance \u22645%)<\/li>\n\n<li>Emballage rempli d'azote (teneur en oxyg\u00e8ne &lt;100ppm)<\/li><\/ul><ul class=\"wp-block-list\"><li><strong>Syst\u00e8me d'alerte en cas de d\u00e9faillance<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>M\u00e9canisme d'alerte \u00e0 trois niveaux :<br>Niveau 1 : Alarme sonore et visuelle lorsque la temp\u00e9rature d\u00e9passe 85\u00b0C<br>Niveau 2 : R\u00e9duction automatique de la fr\u00e9quence lorsque le courant d\u00e9passe la limite<br>Niveau 3 : Protection par fusible (temps d'action &amp;lt ; 50 ms)<\/li><\/ul><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Summary\"><\/span>R\u00e9sum\u00e9<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Les probl\u00e8mes de surcharge des circuits imprim\u00e9s entra\u00eenent une d\u00e9gradation des performances \u00e9lectriques, des d\u00e9faillances thermiques et des risques pour la stabilit\u00e9 du syst\u00e8me, et doivent \u00eatre contr\u00f4l\u00e9s tout au long du processus de conception, de fabrication et d'essai. La fiabilit\u00e9 des circuits imprim\u00e9s peut \u00eatre consid\u00e9rablement am\u00e9lior\u00e9e gr\u00e2ce \u00e0 des calculs pr\u00e9cis de la capacit\u00e9 de transport de courant (par exemple, une \u00e9paisseur de cuivre de 4 oz + une largeur de trace de 15 mm supportant 100 A), \u00e0 une conception thermique avanc\u00e9e (r\u00e9seaux de trous de dissipation thermique en nid d'abeille r\u00e9duisant l'augmentation de la temp\u00e9rature de 35 %), \u00e0 un contr\u00f4le strict du processus (remplissage de cuivre VIPPO r\u00e9duisant la r\u00e9sistance de 40 %) et \u00e0 une surveillance intelligente (alertes en temps r\u00e9el concernant le courant et la temp\u00e9rature).<\/p><div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-3 wp-block-buttons-is-layout-flex\"><div class=\"wp-block-button\"><a class=\"wp-block-button__link has-white-color has-vivid-green-cyan-background-color has-text-color has-background has-link-color wp-element-button\" href=\"https:\/\/www.topfastpcb.com\/fr\/contact\/\">Topfast :Consultez votre expert local en mati\u00e8re de circuits imprim\u00e9s<\/a><\/div><\/div><p><\/p>","protected":false},"excerpt":{"rendered":"<p>Cet article analyse syst\u00e9matiquement les risques de surcharge des circuits imprim\u00e9s (tels que la fusion de la feuille de cuivre et la distorsion du signal) et fournit une solution de protection compl\u00e8te, comprenant un calcul pr\u00e9cis de la capacit\u00e9 de charge (solution d'\u00e9paisseur de cuivre 4OZ au niveau 100A), l'optimisation de l'int\u00e9grit\u00e9 de la puissance (matrice de condensateurs de d\u00e9couplage), le remplissage de cuivre VIPPO (capacit\u00e9 de charge \u219130%), et la protection du rev\u00eatement \u00e0 trois \u00e9preuves (test au brouillard salin 1000h) avec surveillance en temps r\u00e9el du courant\/de la temp\u00e9rature, et la protection par fusible \u00e0 trois niveaux (action <50ms), providing a reliable reference for high-power electronic design.\n<\/p>","protected":false},"author":1,"featured_media":3389,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[109],"tags":[111,296],"class_list":["post-3387","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-faq","tag-pcb","tag-pcb-overload"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Will too many components on a PCB cause overload? 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