{"id":17413,"date":"2026-09-14T13:53:52","date_gmt":"2026-09-14T05:53:52","guid":{"rendered":"https:\/\/www.wehopower.com\/?post_type=news&#038;p=17413"},"modified":"2026-09-24T13:55:21","modified_gmt":"2026-09-24T05:55:21","slug":"how-alternator-ripple-affects-automotive-dc-dc-converter-performance","status":"publish","type":"news","link":"https:\/\/www.wehopower.com\/fr\/news\/how-alternator-ripple-affects-automotive-dc-dc-converter-performance\/","title":{"rendered":"Comment l'ondulation de l'alternateur affecte les performances du convertisseur DC-DC"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey 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\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Basculer<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/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.wehopower.com\/fr\/news\/how-alternator-ripple-affects-automotive-dc-dc-converter-performance\/#Introduction\" >Introduction<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.wehopower.com\/fr\/news\/how-alternator-ripple-affects-automotive-dc-dc-converter-performance\/#What_Is_Alternator_Ripple\" >Qu 'est-ce que l'alternateur Ripple?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.wehopower.com\/fr\/news\/how-alternator-ripple-affects-automotive-dc-dc-converter-performance\/#Why_Alternators_Produce_Voltage_Ripple\" >Pourquoi les alternateurs produisent des ondulations de tension<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.wehopower.com\/fr\/news\/how-alternator-ripple-affects-automotive-dc-dc-converter-performance\/#Effects_of_Alternator_Ripple_on_DC-DC_Converter_Performance\" >Effets de l'ondulation de l'alternateur sur les performances du convertisseur DC-DC<\/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.wehopower.com\/fr\/news\/how-alternator-ripple-affects-automotive-dc-dc-converter-performance\/#Output_Voltage_Instability\" >Instabilit\u00e9 de voltage<\/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.wehopower.com\/fr\/news\/how-alternator-ripple-affects-automotive-dc-dc-converter-performance\/#Increased_Component_Stress_and_Heat\" >Augmentation du stress et de la chaleur des composants<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.wehopower.com\/fr\/news\/how-alternator-ripple-affects-automotive-dc-dc-converter-performance\/#Reduced_Converter_Lifespan\" >Convertisseur Lifespan<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.wehopower.com\/fr\/news\/how-alternator-ripple-affects-automotive-dc-dc-converter-performance\/#How_Automotive_DC-DC_Converters_Filter_Ripple\" >Comment les convertisseurs automobiles DC-DC filtrent Ripple<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.wehopower.com\/fr\/news\/how-alternator-ripple-affects-automotive-dc-dc-converter-performance\/#Input_Filtering_Design\" >Design de filtrage d'entr\u00e9e<\/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.wehopower.com\/fr\/news\/how-alternator-ripple-affects-automotive-dc-dc-converter-performance\/#Wide_Input_Voltage_Range_Tolerance\" >Large gamme de tol\u00e9rance de voltage d'entr\u00e9e<\/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.wehopower.com\/fr\/news\/how-alternator-ripple-affects-automotive-dc-dc-converter-performance\/#Best_Practices_to_Minimize_Ripple-Related_Issues\" >Les meilleures pratiques pour minimiser les probl\u00e8mes li\u00e9s \u00e0 Ripple<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.wehopower.com\/fr\/news\/how-alternator-ripple-affects-automotive-dc-dc-converter-performance\/#What_Makes_WEHO_DC-DC_Converters_a_Reliable_Choice\" >Qu 'est-ce qui fait des convertisseurs DC-DC WEHO un choix fiable?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.wehopower.com\/fr\/news\/how-alternator-ripple-affects-automotive-dc-dc-converter-performance\/#FAQs\" >FAQ<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.wehopower.com\/fr\/news\/how-alternator-ripple-affects-automotive-dc-dc-converter-performance\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Introduction\"><\/span><strong><b>Introduction<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Si vous \u00eates un acheteur B2B qui <a href=\"https:\/\/www.wehopower.com\/fr\/product\/\" target=\"_blank\" rel=\"noopener\"><em><strong>Convertisseurs DC-DC<\/strong><\/em><\/a> Pour les v\u00e9hicules, vous avez probablement entendu parler du terme \u201c ondulation de l'alternateur \u201d, mais qu 'est-ce que cela signifie?<\/p>\n<p>Dans le syst\u00e8me entra\u00een\u00e9 par le moteur \u00e0 combustion interne, l'alternateur charge la batterie tout en fournissant de l'\u00e9nergie \u00e0 l'\u00e9quipement \u00e9lectrique de la voiture, mais sa sortie n'est pas le genre de courant continu propre, mais le composant CA superpos\u00e9 \u00e0 la tension CC. Le r\u00e9gime du moteur change, l'interrupteur du r\u00e9gulateur se d\u00e9place et la charge change \u00e9galement, ce qui produira les ondulations.<\/p>\n<p>Pour les convertisseurs DC-DC, les ondulations ne sont pas seulement aussi simples qu 'un peu de bruit en arri\u00e8re-plan, mais peuvent \u00e9galement rendre la sortie instable, la pression sur le composant augmente, la chaleur augmente et la dur\u00e9e de vie du convertisseur sera \u00e9galement r\u00e9duite.Cet article parlera de ce qu' est l'ondulation de l'alternateur, comment elle affecte les performances du convertisseur DC-DC et \u00e0 quoi faire attention lors du choix d'un convertisseur.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_Is_Alternator_Ripple\"><\/span><strong><b>Qu 'est-ce que l'alternateur Ripple?<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>L'ondulation de l'alternateur est la fluctuation de la tension du courant alternatif superpos\u00e9e \u00e0 la sortie CC de l'alternateur du v\u00e9hicule. Le g\u00e9n\u00e9rateur lui-m\u00eame produit du courant alternatif, qui doit \u00eatre converti en courant continu par le redresseur, mais apr\u00e8s rectification, il restera encore des composants de courant alternatif sur la sortie de courant continu.<\/p>\n<p>La fr\u00e9quence de l'ondulation est li\u00e9e \u00e0 la vitesse du moteur, environ 50Hz et 25kHz, et l'amplitude varie de 1V cr\u00eate \u00e0 6V.La taille sp\u00e9cifique d\u00e9pend de la distance \u00e0 laquelle l'\u00e9quipement est install\u00e9 du g\u00e9n\u00e9rateur, convertisseur DC-DC et batterie.<\/p>\n<p>La section 4.4 de l'ISO 16750 - 2 stipule que la plage de fr\u00e9quence d'ondulation de la sortie de l'alternateur est comprise entre 50 Hz et 25 kHz, et que l'amplitude de cr\u00eate est divis\u00e9e en niveaux de 1 V, 2 V et 4 V. Certains fabricants peuvent exiger des fr\u00e9quences allant jusqu'\u00e0 200 kHz.<\/p>\n<p>La batterie elle-m\u00eame peut filtrer une partie des ondulations.Lorsque le moteur tourne, la batterie filtrera certaines ondulations.Le pic d'ondulation mesur\u00e9 \u00e0 l'extr\u00e9mit\u00e9 de la batterie n'est g\u00e9n\u00e9ralement que de dizaines de millilitres, mais plus il est \u00e9loign\u00e9 de la batterie, plus les ondulations sont \u00e9videntes.<\/p>\n<figure id=\"attachment_17415\" aria-describedby=\"caption-attachment-17415\" style=\"width: 750px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-large wp-image-17415\" title=\"Qu &#039;est-ce que l&#039;alternateur Ripple?\" src=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/\u5de5\u4e1a\u7ea7LED\u9a71\u52a8\u5728\u6237\u5916\u5e94\u7528\u7684\u4f18\u52bf\u53caWEHO\u4ea7\u54c1\u4ecb\u7ecd-11-1024x575.png\" alt=\"Qu &#039;est-ce que l&#039;alternateur Ripple?\" width=\"750\" height=\"421\" srcset=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/\u5de5\u4e1a\u7ea7LED\u9a71\u52a8\u5728\u6237\u5916\u5e94\u7528\u7684\u4f18\u52bf\u53caWEHO\u4ea7\u54c1\u4ecb\u7ecd-11-1024x575.png 1024w, https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/\u5de5\u4e1a\u7ea7LED\u9a71\u52a8\u5728\u6237\u5916\u5e94\u7528\u7684\u4f18\u52bf\u53caWEHO\u4ea7\u54c1\u4ecb\u7ecd-11-300x169.png 300w, https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/\u5de5\u4e1a\u7ea7LED\u9a71\u52a8\u5728\u6237\u5916\u5e94\u7528\u7684\u4f18\u52bf\u53caWEHO\u4ea7\u54c1\u4ecb\u7ecd-11-768x431.png 768w, https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/\u5de5\u4e1a\u7ea7LED\u9a71\u52a8\u5728\u6237\u5916\u5e94\u7528\u7684\u4f18\u52bf\u53caWEHO\u4ea7\u54c1\u4ecb\u7ecd-11-1536x863.png 1536w, https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/\u5de5\u4e1a\u7ea7LED\u9a71\u52a8\u5728\u6237\u5916\u5e94\u7528\u7684\u4f18\u52bf\u53caWEHO\u4ea7\u54c1\u4ecb\u7ecd-11-2048x1151.png 2048w, https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/\u5de5\u4e1a\u7ea7LED\u9a71\u52a8\u5728\u6237\u5916\u5e94\u7528\u7684\u4f18\u52bf\u53caWEHO\u4ea7\u54c1\u4ecb\u7ecd-11-18x10.png 18w, https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/\u5de5\u4e1a\u7ea7LED\u9a71\u52a8\u5728\u6237\u5916\u5e94\u7528\u7684\u4f18\u52bf\u53caWEHO\u4ea7\u54c1\u4ecb\u7ecd-11-1568x881.png 1568w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><figcaption id=\"caption-attachment-17415\" class=\"wp-caption-text\">Qu 'est-ce que l'alternateur Ripple?<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Why_Alternators_Produce_Voltage_Ripple\"><\/span><strong><b>Pourquoi les alternateurs produisent des ondulations de tension<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>L'alternateur est essentiellement un alternateur avec un stator triphas\u00e9 et un champ magn\u00e9tique rotatif. Le redresseur est g\u00e9n\u00e9ralement un pont de diode triphas\u00e9 qui convertit la sortie AC en DC.<\/p>\n<p>Cependant, le processus de rectification ne peut pas \u00eatre parfait.La diode n'est conductrice que dans une partie de chaque cycle AC, et le courant continu r\u00e9sultant a une pulsation, qui sont des ondulations.<\/p>\n<p>Plusieurs facteurs affectent l'amplitude et la fr\u00e9quence de l'ondulation:<\/p>\n<p><strong><b>Moteur Speed<\/b><\/strong>\u00a0- Plus la vitesse est \u00e9lev\u00e9e, plus la fr\u00e9quence d'ondulation est \u00e9lev\u00e9e, qui est d\u00e9termin\u00e9e par trois facteurs: la vitesse du moteur, le rapport de poulie et le logarithme polaire.<\/p>\n<p><strong><b>Load Conditions<\/b><\/strong>\u00a0- D\u00e8s que la charge \u00e9lectrique change, le r\u00e9gulateur doit ajuster le courant d'excitation et la tension de sortie fluctuera en cons\u00e9quence.<\/p>\n<p><strong><b>Rectificateur Sant\u00e9<\/b><\/strong>\u00a0- Si la diode dans le redresseur est cass\u00e9e, la tension d'ondulation excessive se d\u00e9roulera dans le syst\u00e8me, ce qui montre que l'ondulation est trop grande.<\/p>\n<p><strong><b>Batterie conditionn\u00e9e<\/b><\/strong>\u00a0- Si la batterie est hors tension ou sur le point de tomber en panne, la capacit\u00e9 de filtrer les ondulations n'est pas suffisante, et plus de bruit CA sera ex\u00e9cut\u00e9 vers les appareils \u00e9lectroniques en aval.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Effects_of_Alternator_Ripple_on_DC-DC_Converter_Performance\"><\/span><strong><b>Effets de l'ondulation de l'alternateur sur les performances du convertisseur DC-DC<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Output_Voltage_Instability\"><\/span><strong><b>Instabilit\u00e9 de voltage<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Le convertisseur DC-DC est con\u00e7u pour produire une tension de sortie stable lorsque la tension d'entr\u00e9e change, mais si l'ondulation \u00e0 l'extr\u00e9mit\u00e9 d'entr\u00e9e est trop grande, la boucle de r\u00e9glage du convertisseur peut ne pas suivre.<\/p>\n<p>Lorsque la tension d'entr\u00e9e saute d'avant en arri\u00e8re avec l'ondulation, il est difficile pour la boucle de contr\u00f4le de stabiliser la tension de sortie. En cons\u00e9quence, la tension de sortie fluctue \u00e9galement et l'\u00e9quipement arri\u00e8re sera affect\u00e9. Dans la gamme de fr\u00e9quences audio, l'ondulation de l'alternateur causera \u00e9galement des probl\u00e8mes de sifflement et de modulation de puissance.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Increased_Component_Stress_and_Heat\"><\/span><strong><b>Augmentation du stress et de la chaleur des composants<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>La corriente de ondulaci\u00f3n que fluye a trav\u00e9s del condensador de entrada del convertidor DC-DC causar\u00e1 disipaci\u00f3n de potencia. Cuanto mayor sea la corriente de ondulaci\u00f3n, m\u00e1s energ\u00eda se consume en el condensador.<\/p>\n<p>If the ripple current is not limited, the aging of the component will accelerate and the overall reliability will be reduced.The amplitude of the ripple current will also change the loss and heat load of the power device, especially when the converter has a low power output.<\/p>\n<p>Dans la configuration compacte, chaque courant d'ondulation suppl\u00e9mentaire de 1A augmentera la temp\u00e9rature locale de 10 \u00e0 15 \u00b0 C. Si le courant d'ondulation augmente de 20%, la dur\u00e9e de vie du condensateur dans le syst\u00e8me de bus CC peut \u00eatre r\u00e9duite de moiti\u00e9.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Reduced_Converter_Lifespan\"><\/span><strong><b>Convertisseur Lifespan<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Si l'ondulation est trop grande, elle interf\u00e9rera avec le fonctionnement normal du circuit \u00e9lectronique, r\u00e9chauffera les composants, et la dur\u00e9e de vie du condensateur et du semi-conducteur sera \u00e9galement comprim\u00e9e.Apr\u00e8s s'\u00eatre accumul\u00e9e pendant une longue p\u00e9riode, la contrainte augmentera et finalement elle sera endommag\u00e9e \u00e0 l'avance.<\/p>\n<figure id=\"attachment_17418\" aria-describedby=\"caption-attachment-17418\" style=\"width: 750px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-large wp-image-17418\" title=\"Effets de l&#039;ondulation de l&#039;alternateur sur les performances du convertisseur DC-DC\" src=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/\u5de5\u4e1a\u7ea7LED\u9a71\u52a8\u5728\u6237\u5916\u5e94\u7528\u7684\u4f18\u52bf\u53caWEHO\u4ea7\u54c1\u4ecb\u7ecd-13-1024x575.png\" alt=\"Effets de l&#039;ondulation de l&#039;alternateur sur les performances du convertisseur DC-DC\" width=\"750\" height=\"421\" srcset=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/\u5de5\u4e1a\u7ea7LED\u9a71\u52a8\u5728\u6237\u5916\u5e94\u7528\u7684\u4f18\u52bf\u53caWEHO\u4ea7\u54c1\u4ecb\u7ecd-13-1024x575.png 1024w, https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/\u5de5\u4e1a\u7ea7LED\u9a71\u52a8\u5728\u6237\u5916\u5e94\u7528\u7684\u4f18\u52bf\u53caWEHO\u4ea7\u54c1\u4ecb\u7ecd-13-300x169.png 300w, https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/\u5de5\u4e1a\u7ea7LED\u9a71\u52a8\u5728\u6237\u5916\u5e94\u7528\u7684\u4f18\u52bf\u53caWEHO\u4ea7\u54c1\u4ecb\u7ecd-13-768x431.png 768w, https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/\u5de5\u4e1a\u7ea7LED\u9a71\u52a8\u5728\u6237\u5916\u5e94\u7528\u7684\u4f18\u52bf\u53caWEHO\u4ea7\u54c1\u4ecb\u7ecd-13-1536x863.png 1536w, https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/\u5de5\u4e1a\u7ea7LED\u9a71\u52a8\u5728\u6237\u5916\u5e94\u7528\u7684\u4f18\u52bf\u53caWEHO\u4ea7\u54c1\u4ecb\u7ecd-13-2048x1151.png 2048w, https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/\u5de5\u4e1a\u7ea7LED\u9a71\u52a8\u5728\u6237\u5916\u5e94\u7528\u7684\u4f18\u52bf\u53caWEHO\u4ea7\u54c1\u4ecb\u7ecd-13-18x10.png 18w, https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/\u5de5\u4e1a\u7ea7LED\u9a71\u52a8\u5728\u6237\u5916\u5e94\u7528\u7684\u4f18\u52bf\u53caWEHO\u4ea7\u54c1\u4ecb\u7ecd-13-1568x881.png 1568w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><figcaption id=\"caption-attachment-17418\" class=\"wp-caption-text\">Effets de l'ondulation de l'alternateur sur les performances du convertisseur DC-DC<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"How_Automotive_DC-DC_Converters_Filter_Ripple\"><\/span><strong><b>Comment les convertisseurs automobiles DC-DC filtrent Ripple<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Input_Filtering_Design\"><\/span><strong><b>Design de filtrage d'entr\u00e9e<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>G\u00e9n\u00e9ralement, les filtres passe-bas inductance-capacit\u00e9, c'est-\u00e0-dire les filtres LC, sont utilis\u00e9s comme premi\u00e8re ligne de d\u00e9fense pour supprimer les interf\u00e9rences transitoires.<\/p>\n<p>Cependant, si le filtre LC veut filtrer les interf\u00e9rences basses fr\u00e9quences, la fr\u00e9quence de coupure doit \u00eatre r\u00e9gl\u00e9e relativement basse, de sorte que le volume de l'inducteur de filtre et du condensateur \u00e9lectrolytique ne soit pas petit.Un filtre EMI sp\u00e9cial sera \u00e9galement ajout\u00e9 \u00e0 l'entr\u00e9e du convertisseur DC-DC, qui est \u00e9quivalent \u00e0 un filtre passe-bas pour bloquer le bruit au-dessus de la fr\u00e9quence de coupure.<\/p>\n<p>Un bon convertisseur utilisera \u00e9galement un condensateur en c\u00e9ramique \u00e0 l'extr\u00e9mit\u00e9 d'entr\u00e9e pour fournir au r\u00e9gulateur une alimentation \u00e9lectrique \u00e0 faible imp\u00e9dance, et en m\u00eame temps, il peut r\u00e9sister au courant d'ondulation tout en s\u00e9parant le bruit de commutation.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Wide_Input_Voltage_Range_Tolerance\"><\/span><strong><b>Large gamme de tol\u00e9rance de voltage d'entr\u00e9e<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Une autre id\u00e9e de conception cl\u00e9 est d'utiliser un convertisseur avec une large plage de tension d'entr\u00e9e. Le taux de suppression de puissance du large r\u00e9gulateur de tension de levage VIN est \u00e9lev\u00e9, et la performance dynamique transitoire est \u00e9galement bonne. Il peut le supprimer une fois que la tension d'entr\u00e9e fluctue.<\/p>\n<p>La plage d'entr\u00e9e du convertisseur DC-DC automobile de WEHO est relativement large, telle que l'entr\u00e9e de 9V \u00e0 32V DC. Il peut \u00e9galement g\u00e9rer les fluctuations de tension caus\u00e9es par les ondulations de l'alternateur, et la stabilit\u00e9 de sortie ne sera pas affect\u00e9e.<\/p>\n<table>\n<tbody>\n<tr>\n<td>M\u00e9thode de filtrage<\/td>\n<td>Comment \u00e7a marche<\/td>\n<td>Avantage cl\u00e9<\/td>\n<\/tr>\n<tr>\n<td>Filtre d'entr\u00e9e LC<\/td>\n<td>Le filtre inducteur-condensateur passe-bas rejette les perturbations transitoires<\/td>\n<td>La premi\u00e8re ligne de d\u00e9fense contre Ripple<\/td>\n<\/tr>\n<tr>\n<td>Filtre EMI<\/td>\n<td>Un filtre d\u00e9di\u00e9 att\u00e9nue le bruit au-del\u00e0 de la fr\u00e9quence de coupure<\/td>\n<td>R\u00e9duit les interf\u00e9rences haute fr\u00e9quence<\/td>\n<\/tr>\n<tr>\n<td>Ceramic Input Capacitors<\/td>\n<td>Provides low-impedance source to the regulator<\/td>\n<td>Supplies ripple current while isolating switching noise<\/td>\n<\/tr>\n<tr>\n<td>Wide Input Voltage Range<\/td>\n<td>Buck-boost regulator with high PSRR<\/td>\n<td>Tolerates voltage fluctuations without output drift<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><span class=\"ez-toc-section\" id=\"Best_Practices_to_Minimize_Ripple-Related_Issues\"><\/span><strong><b>Les meilleures pratiques pour minimiser les probl\u00e8mes li\u00e9s \u00e0 Ripple<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>When purchasing DC-DC converters for automotive applications, please consider the following best practises:<\/p>\n<p><strong><b>Choose converters with strong internal filtering<\/b><\/strong>\u00a0\u2013 WEHO&#8217;s models have been tested for full-load ageing, and noise control has also been designed to minimise ripple-related problems.<\/p>\n<p><strong><b>Keep cable runs short<\/b><\/strong>\u00a0\u2013 If the cable is long, it will receive noise like an antenna, and the risk of ripple interference will increase.<\/p>\n<p><strong><b>Use proper grounding<\/b><\/strong>\u00a0\u2013 The converter and all connecting devices should share a grounding, so as to minimise the grounding loop.<\/p>\n<p><strong><b>Select converters rated for automotive environments<\/b><\/strong>\u00a0\u2013 Stare at those models that have a wide input voltage range, use car-grade components, and meet ISO standards.<\/p>\n<p><strong><b>Verify ripple specifications<\/b><\/strong>\u00a0\u2013 Check the ripple and noise parameters of the converter, such as some models of the WEHO SD series, where the ripple and noise can be as low as 100mV peaks.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_Makes_WEHO_DC-DC_Converters_a_Reliable_Choice\"><\/span><strong><b>Qu 'est-ce qui fait des convertisseurs DC-DC WEHO un choix fiable?<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The environment of the car is inherently complicated. When choosing a converter, you have to find one that can withstand the actual working conditions. WEHO has been working in power conversion for more than 16 years, and has experience and background.<\/p>\n<p><a href=\"https:\/\/www.wehopower.com\/fr\/\" target=\"_blank\" rel=\"noopener\"><em><strong>WEHO<\/strong> <\/em><\/a>automotive DC-DC converter has several practical features:<\/p>\n<ul>\n<li><b><\/b><strong><b>Strong input filtering<\/b><\/strong>to minimize ripple and electrical noise<\/li>\n<li><b><\/b><strong><b>Wide input voltage ranges<\/b><\/strong>(e.g., 9V to 32VDC) to handle alternator fluctuations<\/li>\n<li><b><\/b><strong><b>Automotive-grade construction<\/b><\/strong>with aluminum housings for effective heat dissipation<\/li>\n<li><b><\/b><strong><b>Low ripple and noise specifications<\/b><\/strong>\u2014as low as 100mVp-p on SD series models<\/li>\n<li><b><\/b><strong><b>Full-load aging tests<\/b><\/strong>before shipment to ensure reliability<\/li>\n<li><b><\/b><strong><b>Comprehensive protection features<\/b><\/strong>including overvoltage, overcurrent, and overheat protection<\/li>\n<\/ul>\n<p>WEHO&#8217;s converters are used in both industrial automation and automotive fields, and they can also be output stably in harsh environments.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQs\"><\/span><strong><b>FAQ<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong><b>What causes voltage ripple from a vehicle alternator?<\/b><\/strong><\/p>\n<p>The alternating current itself is alternating current, which needs to be converted into direct current through the rectifier, but after rectification, some of the AC components will still remain, which is the ripple. The engine speed is changing, the regulator is constantly switching, and the load is also changing, which will make the ripple run out.<\/p>\n<p><strong><b>How much ripple can a DC-DC converter tolerate?<\/b><\/strong><\/p>\n<p>Looking at the design of the converter itself, the standard automotive DC-DC converter should be able to handle the ripple level specified in ISO 16750-2. The peak peaks of 1V, 2V and 4V can withstand the frequency range of 50Hz to 25kHz. The input filter is well done, and the input voltage range is wide. The converter can work normally under these conditions, and the performance will not be lost.<\/p>\n<p><strong><b>Does alternator ripple shorten converter lifespan?<\/b><\/strong><\/p>\n<p>It is. If the ripple is too large, the component will bear more thermal stress. For every 1A increase in the ripple current, the local temperature will increase by 10 to 15\u00b0C. If the ripple current increases by 20%, the capacitor life may be halved. As the stress accumulates for a long time, the converter is easy to break down in advance.<\/p>\n<p><strong><b>How can I reduce alternator ripple in a vehicle electrical system?<\/b><\/strong><\/p>\n<p>Choose a DC-DC converter with strong internal filtering ability and low ripple specifications. The cable should be as short as possible, the grounding should be right, and the battery and generator should be kept in good condition. If the battery is low, the ability to filter ripples will not be enough. In addition, choosing a converter with a wide input voltage range can also better withstand voltage fluctuations.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span><strong><b>Conclusion<\/b><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Alternator ripple is a real threat to automobile DC-DC converters, and it is often underestimated. It will lead to unstable output, increased pressure on components, increased heat, and finally shortened equipment life. However, if the right converter is chosen, the input filter is strong enough, the input voltage range is wide, and the reliability is verified, the equipment can be protected, and stable operation for a long time is guaranteed.<\/p>\n<p>When purchasing DC-DC converters for automotive applications, you should pay attention to whether the symbols do not meet the ISO 16750-2 standard, whether the ripple specifications are low, and whether the structural design is for the automotive environment. Don&#8217;t consider the converter that can&#8217;t handle the complex electrical environment in the car.<\/p>\n<p><a href=\"https:\/\/www.wehopower.com\/fr\/\" target=\"_blank\" rel=\"noopener\"><em><strong>WEHO<\/strong><\/em><\/a> automotive DC-DC converter product line is relatively complete, with strong filtering ability, wide input range, and reliability have been verified. It has been done for more than 16 years, and each unit has been tested for full load ageing. B2B buyers can rest assured to cooperate. <a href=\"https:\/\/www.wehopower.com\/fr\/contact\/\" target=\"_blank\" rel=\"noopener\"><em><strong>Contacter WEHO<\/strong><\/em><\/a> today to find the right DC-DC converter for your automotive application.<\/p>","protected":false},"excerpt":{"rendered":"<p>Pour les convertisseurs DC-DC, les ondulations ne sont pas seulement aussi simples qu 'un peu de bruit en arri\u00e8re-plan, mais peuvent \u00e9galement rendre la sortie instable, la pression sur le composant augmente, la chaleur augmente et la dur\u00e9e de vie du convertisseur sera \u00e9galement r\u00e9duite.Cet article parlera de ce qu' est l'ondulation de l'alternateur, comment elle affecte les performances du convertisseur DC-DC et \u00e0 quoi faire attention lors du choix d'un convertisseur.<\/p>","protected":false},"author":4,"featured_media":17414,"parent":0,"menu_order":395,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"_acf_changed":false,"_joinchat":[],"footnotes":""},"news_category":[149,148],"class_list":["post-17413","news","type-news","status-publish","format-standard","has-post-thumbnail","hentry","news_category-blog","news_category-industry-news","entry"],"acf":[],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/news\/17413","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/news"}],"about":[{"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/types\/news"}],"author":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/comments?post=17413"}],"version-history":[{"count":5,"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/news\/17413\/revisions"}],"predecessor-version":[{"id":18178,"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/news\/17413\/revisions\/18178"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/media\/17414"}],"wp:attachment":[{"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/media?parent=17413"}],"wp:term":[{"taxonomy":"news_category","embeddable":true,"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/news_category?post=17413"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}