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wangfuwang
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樓主  發(fā)表于: 2014-12-19 09:23
這個(gè)穩壓二極管1N4745為何老燒壞，電路24小時(shí)長(cháng)期通電，最多十天燒壞，最短期一個(gè)星期，連續燒壞好幾次了,
謝謝你們的建議，我不能用變壓器，只能用電容降壓后整流出來(lái)，再穩壓供設備用電
[ 此帖被wangfuwang在2014-12-19 11:32重新編輯 ]
wwcwwc
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1樓  發(fā)表于: 2014-12-19 11:00
從這個(gè)電路看是為了保護三端穩壓集成塊7812的，如果采用變壓器降壓是完全不需要這個(gè)保護。
擊穿這個(gè)二極管最根本的問(wèn)題的二極管工作電流超過(guò)這個(gè)二極管的額定值，特別是在晚間電網(wǎng)電壓上升后，流過(guò)該二極管的電流將會(huì )比白天要大。解決的辦法：
1）更換電流值大的（穩壓二極管一般標注功率的）。
2）采用三極管擴流。

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