近年來，開(kai)關電源的(de)應用范圍(wei)越來越廣(guang)泛，我們(men)生活中也隨處可見，那么如果電源出現故障怎(zen)么辦(ban)，沒關系，今天電源(yuan)適(shi)配器(qi)廠家(jia)就來教大家(jia)如何維修開關(guan)電源。

開關電(dian)源以電(dian)視機(ji)(ji)，彩(cai)顯，DVD等(deng)小(xiao)型開關電(dian)源為一類(lei)。大點(dian)的以電(dian)腦電(dian)源，焊機(ji)(ji)逆變(bian)電(dian)源，專用電(dian)源為一類(lei)。更復雜的有(you)UPS電(dian)源。

開關電(dian)(dian)(dian)(dian)(dian)源(yuan)常有整(zheng)流電(dian)(dian)(dian)(dian)(dian)路，振(zhen)蕩電(dian)(dian)(dian)(dian)(dian)路（現在(zai)很(hen)多(duo)用(yong)振(zhen)蕩IC），驅動，穩壓(ya)反(fan)饋電(dian)(dian)(dian)(dian)(dian)路，穩壓(ya)取樣電(dian)(dian)(dian)(dian)(dian)路，尖(jian)脈沖吸收電(dian)(dian)(dian)(dian)(dian)路，起(qi)動電(dian)(dian)(dian)(dian)(dian)路，起(qi)動后二次供電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)路，過流保護電(dian)(dian)(dian)(dian)(dian)路，過壓(ya)保護電(dian)(dian)(dian)(dian)(dian)路。有的(de)有過熱保護電(dian)(dian)(dian)(dian)(dian)路，變(bian)壓(ya)器后有整(zheng)流電(dian)(dian)(dian)(dian)(dian)路等。說(shuo)起(qi)來這么多(duo)，有的(de)開關電(dian)(dian)(dian)(dian)(dian)源(yuan)也就(jiu)十幾個元件。

小型功(gong)率開關電(dian)(dian)源先頭的(de)多(duo)(duo)是橋式整(zheng)電(dian)(dian)路，這(zhe)個(ge)很簡單(dan)。電(dian)(dian)視機用(yong)的(de)，大(da)多(duo)(duo)有(you)起動電(dian)(dian)阻(zu)，起動電(dian)(dian)阻(zu)從幾十K到(dao)幾M都(dou)有(you)。基本是從300V直流接到(dao)開關管的(de)B極。維(wei)修經驗中這(zhe)個(ge)壞得多(duo)(duo)，壞了(le)后基本是電(dian)(dian)阻(zu)成(cheng)開路。現像450V大(da)電(dian)(dian)容通(tong)電(dian)(dian)后不會放(fang)電(dian)(dian)，也就是開關電(dian)(dian)源沒有(you)起振。這(zhe)個(ge)電(dian)(dian)阻(zu)要拆下來(lai)量，在板(ban)上量得不準(zhun)的(de)。

修(xiu)(xiu)這種開關電(dian)源，元件不多(duo)，用(yong)模糊修(xiu)(xiu)理法。先(xian)量二極(ji)管(guan)，再三(san)極(ji)管(guan)，都(dou)在板上量，要(yao)是哪個不對(dui)才(cai)拆下(xia)來(lai)。再量電(dian)阻，一個一個量清，一般量下(xia)來(lai)只要(yao)十來(lai)分就可以量完的，小的三(san)極(ji)管(guan)直接全換(huan)(huan)(huan)了(le)，電(dian)解電(dian)容全換(huan)(huan)(huan)了(le)，耐壓450V這個有時就不用(yong)換(huan)(huan)(huan)了(le)。

如果是(shi)修(xiu)(xiu)大功(gong)率的開關電(dian)源，以上方法也可以用(yong)的，只是(shi)它(ta)電(dian)路要多很多，修(xiu)(xiu)起來(lai)就(jiu)沒有這(zhe)么簡(jian)單(dan)了。最好先分(fen)析電(dian)路后，看清后再修(xiu)(xiu)。以上這(zhe)些就(jiu)是(shi)電(dian)源適配(pei)器廠(chang)家多年來(lai)積攢的經(jing)驗，這(zhe)里分(fen)享(xiang)出來(lai)希(xi)望(wang)能(neng)夠幫到大家。