{"id":12797,"date":"2023-08-30T06:17:30","date_gmt":"2023-08-30T06:17:30","guid":{"rendered":"https:\/\/www2.iled-lights.com\/?p=12797"},"modified":"2023-08-30T09:58:03","modified_gmt":"2023-08-30T09:58:03","slug":"contrast-to-explain-two-dimming-ways-of-white-led","status":"publish","type":"post","link":"https:\/\/www.iled-lights.com\/fr\/contrast-to-explain-two-dimming-ways-of-white-led-a67.html","title":{"rendered":"Contraste pour expliquer les deux modes d'att\u00e9nuation de la LED blanche"},"content":{"rendered":"

Les LED blanches peuvent \u00eatre att\u00e9nu\u00e9es \u00e0 l'aide de deux m\u00e9thodes principales : l'att\u00e9nuation analogique et la modulation de largeur d'impulsion (PWM).<\/p>\n

1. Att\u00e9nuation analogique :<\/strong> L'att\u00e9nuation analogique ajuste la luminosit\u00e9 de la LED en variant le courant continu qui y circule. Cette m\u00e9thode consiste \u00e0 r\u00e9duire le courant pour diminuer la luminosit\u00e9 ou \u00e0 l'augmenter pour l'augmenter. L'att\u00e9nuation analogique fonctionne en ajustant la tension traversant la LED ou en utilisant une r\u00e9sistance de limitation de courant en s\u00e9rie avec la LED. En modifiant la r\u00e9sistance ou le niveau de tension, le courant circulant dans la LED est ajust\u00e9, entra\u00eenant un changement correspondant de luminosit\u00e9. L'att\u00e9nuation analogique offre un effet d'att\u00e9nuation lisse et continu, sans scintillement visible.<\/p>\n

\"LED<\/p>\n

2. Modulation de largeur d'impulsion (PWM) :<\/strong> L'att\u00e9nuation PWM est une technique d'att\u00e9nuation num\u00e9rique qui commute rapidement la LED en position allum\u00e9e et \u00e9teinte \u00e0 haute fr\u00e9quence. Le niveau de luminosit\u00e9 est contr\u00f4l\u00e9 en ajustant le rapport du temps allum\u00e9 (cycle de service) au temps \u00e9teint. Par exemple, un cycle de service plus \u00e9lev\u00e9 (temps allum\u00e9 plus long) entra\u00eene une sortie plus lumineuse, tandis qu'un cycle de service plus faible (temps \u00e9teint plus long) produit une sortie plus sombre. La fr\u00e9quence de commutation est g\u00e9n\u00e9ralement tr\u00e8s \u00e9lev\u00e9e, souvent dans la gamme des kilohertz ou des m\u00e9gahertz, rendant les transitions allum\u00e9\/\u00e9teint imperceptibles \u00e0 l'\u0153il humain. L'att\u00e9nuation PWM est couramment utilis\u00e9e dans les syst\u00e8mes d'\u00e9clairage LED car elle est efficace et permet un contr\u00f4le pr\u00e9cis des niveaux de luminosit\u00e9. Cependant, certaines personnes peuvent remarquer un scintillement \u00e0 de faibles niveaux d'att\u00e9nuation ou si la fr\u00e9quence PWM est trop basse.<\/p>\n

\"LED<\/p>","protected":false},"excerpt":{"rendered":"

White LEDs can be dimmed using two main methods: analog dimming and pulse-width modulation (PWM) dimming. 1. Analog Dimming: Analog dimming adjusts the brightness of the LED by varying the continuous current flowing through it. This method involves reducing the current to lower the brightness or increasing it to raise the brightness. Analog dimming works […]<\/p>\n","protected":false},"author":6,"featured_media":12798,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-12797","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news-and-blog"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.iled-lights.com\/fr\/wp-json\/wp\/v2\/posts\/12797","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.iled-lights.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.iled-lights.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.iled-lights.com\/fr\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.iled-lights.com\/fr\/wp-json\/wp\/v2\/comments?post=12797"}],"version-history":[{"count":2,"href":"https:\/\/www.iled-lights.com\/fr\/wp-json\/wp\/v2\/posts\/12797\/revisions"}],"predecessor-version":[{"id":12802,"href":"https:\/\/www.iled-lights.com\/fr\/wp-json\/wp\/v2\/posts\/12797\/revisions\/12802"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.iled-lights.com\/fr\/wp-json\/wp\/v2\/media\/12798"}],"wp:attachment":[{"href":"https:\/\/www.iled-lights.com\/fr\/wp-json\/wp\/v2\/media?parent=12797"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iled-lights.com\/fr\/wp-json\/wp\/v2\/categories?post=12797"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iled-lights.com\/fr\/wp-json\/wp\/v2\/tags?post=12797"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}