{"id":1904,"date":"2023-12-19T14:43:08","date_gmt":"2023-12-19T14:43:08","guid":{"rendered":"https:\/\/www.mintecinno.com\/?p=1904"},"modified":"2024-04-09T03:41:16","modified_gmt":"2024-04-09T03:41:16","slug":"special-requirements-for-varistors-in-pcba-design","status":"publish","type":"post","link":"https:\/\/www.mintecinno.com\/fr\/special-requirements-for-varistors-in-pcba-design\/","title":{"rendered":"Exigences particuli\u00e8res pour les varistances dans la conception des circuits imprim\u00e9s"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Comprendre les demandes sp\u00e9cifiques concernant les varistances dans les <a href=\"https:\/\/www.mintecinno.com\/fr\/\">Assemblage du PCB<\/a> (<a href=\"https:\/\/www.cenpcba.com\/\">PCBA<\/a>) est essentielle. Voici un aper\u00e7u de ce que <a href=\"https:\/\/www.mintecinno.com\/fr\/\">Conception de PCBA<\/a> des varistances :<\/p>\r\n\r\n\r\n\r\n<h2 id=\"h-operating-temperature-storage\" class=\"wp-block-heading\">Temp\u00e9rature de fonctionnement\/stockage :<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Maintenir la temp\u00e9rature de fonctionnement du circuit dans la fourchette indiqu\u00e9e dans les sp\u00e9cifications du produit. Apr\u00e8s <a href=\"https:\/\/www.cenpcba.com\/\">assembl\u00e9e<\/a>Lorsque le circuit n'est pas op\u00e9rationnel, il doit \u00eatre stock\u00e9 dans la plage de temp\u00e9rature sp\u00e9cifi\u00e9e pour le produit. \u00c9vitez d'utiliser des temp\u00e9ratures sup\u00e9rieures \u00e0 la temp\u00e9rature maximale de fonctionnement sp\u00e9cifi\u00e9e.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Tension de fonctionnement :<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">La tension appliqu\u00e9e aux bornes de la varistance doit \u00eatre inf\u00e9rieure \u00e0 la tension maximale autoris\u00e9e. Une utilisation incorrecte peut entra\u00eener une d\u00e9faillance du produit, des courts-circuits ou des probl\u00e8mes d'\u00e9chauffement. Bien que la tension d'utilisation doive \u00eatre inf\u00e9rieure \u00e0 la tension nominale, en cas de tension continue \u00e0 haute fr\u00e9quence ou d'impulsion, il convient d'\u00e9valuer soigneusement la fiabilit\u00e9 de la varistance.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Chauffage des composants :<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">S'assurer que la temp\u00e9rature de surface de la varistance reste inf\u00e9rieure \u00e0 la temp\u00e9rature de fonctionnement sp\u00e9cifi\u00e9e la plus \u00e9lev\u00e9e (en tenant compte de l'\u00e9l\u00e9vation de temp\u00e9rature caus\u00e9e par l'auto-\u00e9chauffement du composant), comme indiqu\u00e9 dans les sp\u00e9cifications du produit. Confirmer l'\u00e9l\u00e9vation de la temp\u00e9rature de la varistance due aux conditions du circuit dans l'\u00e9tat de fonctionnement r\u00e9el de l'\u00e9quipement.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Zones d'utilisation restreinte :<\/h2>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>Les varistances ne doivent pas \u00eatre utilis\u00e9es dans les environnements suivants :<\/li>\r\n\r\n\r\n\r\n<li>Endroits avec de l'eau ou de l'eau sal\u00e9e.<\/li>\r\n\r\n\r\n\r\n<li>Zones sujettes \u00e0 la condensation.<\/li>\r\n\r\n\r\n\r\n<li>Endroits contenant des gaz corrosifs (tels que le sulfure d'hydrog\u00e8ne, le dioxyde de soufre, l'ammoniac, etc.)<\/li>\r\n\r\n\r\n\r\n<li>Conditions dans lesquelles les vibrations ou les chocs d\u00e9passent la plage sp\u00e9cifi\u00e9e dans les caract\u00e9ristiques du produit.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">S\u00e9lection du PCB :<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Les performances des circuits imprim\u00e9s en oxyde d'aluminium peuvent se d\u00e9t\u00e9riorer en raison de chocs thermiques (cycles de temp\u00e9rature). Il est essentiel de v\u00e9rifier si la carte de circuit imprim\u00e9 affecte la qualit\u00e9 du produit en cours d'utilisation.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">R\u00e9glage de la taille du tampon :<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Une plus grande quantit\u00e9 de brasage entra\u00eene une pression accrue sur la varistance, ce qui provoque des probl\u00e8mes de qualit\u00e9 tels que des fissures superficielles. Par cons\u00e9quent, lors de la conception de la pastille de soudure sur la carte de circuit imprim\u00e9, des formes et des tailles appropri\u00e9es doivent \u00eatre d\u00e9finies en fonction du volume de soudure. Maintenez une taille \u00e9gale pour les pastilles de soudure. Des volumes de soudure in\u00e9gaux sur les patins gauche et droit peuvent retarder la solidification du c\u00f4t\u00e9 o\u00f9 il y a le plus de soudure, ce qui entra\u00eene des fissures induites par la contrainte sur l'autre c\u00f4t\u00e9 pendant le refroidissement de la soudure.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Configuration des composants :<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Installation de varistances dans <a href=\"https:\/\/www.mintecinno.com\/fr\/\">PCBA<\/a> ou le fait de soumettre les cartes de circuits imprim\u00e9s \u00e0 des flexions pendant le fonctionnement peut entra\u00eener des ruptures de varistances. Par cons\u00e9quent, la configuration des composants doit tenir compte de la r\u00e9sistance \u00e0 la flexion de la carte de circuit imprim\u00e9 et \u00e9viter d'appliquer une pression excessive.<\/p>","protected":false},"excerpt":{"rendered":"<p>Il est essentiel de comprendre les exigences sp\u00e9cifiques concernant les varistances dans la conception des circuits imprim\u00e9s (PCBA). Voici un aper\u00e7u de ce que la conception des PCBA exige des varistances : Temp\u00e9rature de fonctionnement\/stockage : Maintenir la temp\u00e9rature de fonctionnement du circuit dans la plage sp\u00e9cifi\u00e9e dans les sp\u00e9cifications du produit. Apr\u00e8s l'assemblage, stocker le circuit dans la plage de temp\u00e9rature sp\u00e9cifi\u00e9e du produit lorsqu'il n'est pas [...]<\/p>","protected":false},"author":3,"featured_media":1905,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[45],"tags":[],"class_list":["post-1904","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Special Requirements for Varistors in PCBA Design - MTI PCBA<\/title>\n<meta name=\"description\" content=\"Explore the critical role of varistors in PCBA design. 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