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光控臺(tái)燈的工作原理?

光控臺(tái)燈的工作原理?

光控臺(tái)燈的工作原理?的問(wèn)題共有1個(gè)回答

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全橋整流后,就不叫交流電了,應(yīng)該叫脈動(dòng)直流電。光敏電阻在黑暗的地方阻值很大,光亮的地方阻值小。黑暗的時(shí)候光敏電阻阻值大,給電容充電的電流就會(huì)大(因?yàn)楣饷綦娮璐罅耍鬟^(guò)的電流小了)。充電快,那么可控硅觸發(fā)角就小,亮度就高。調(diào)整亮度也可通過(guò)可調(diào)電阻調(diào)節(jié)。下一個(gè)半周,也是 0-50度滅,50-180度亮。 0-50度的那段時(shí)間,是可調(diào)電阻對(duì)電容充電的時(shí)間。去掉 R2 R3 RG VD5后,就是最簡(jiǎn)單的可控硅調(diào)壓電路。

2020-03-27

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