光耦是電源適配器(qi)里面眾(zhong)多元器(qi)件的其中之一，是具(ju)有體積小、壽命長、抗(kang)干擾能力(li)強(qiang)等許多優良特點。基本上電源適配器廠家每天的電源生產組裝，都要用到它，現在就來和大家說一說這個東西都有什么作用。

在電源適配器中，光耦主要起(qi)到一(yi)個信(xin)號傳(chuan)遞(di)隔離(li)的(de)作用(yong)。下面電(dian)(dian)(dian)(dian)(dian)(dian)源適配器(qi)廠家就簡單的(de)(de)說一(yi)(yi)下光(guang)(guang)耦(ou)工作流程：變壓(ya)(ya)器(qi)提供(gong)會(hui)給光(guang)(guang)耦(ou)提供(gong)一(yi)(yi)個專用的(de)(de)光(guang)(guang)耦(ou)電(dian)(dian)(dian)(dian)(dian)(dian)源，當(dang)這個光(guang)(guang)耦(ou)電(dian)(dian)(dian)(dian)(dian)(dian)流和(he)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)低于穩壓(ya)(ya)管(guan)給出(chu)的(de)(de)標準電(dian)(dian)(dian)(dian)(dian)(dian)流電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)時，光(guang)(guang)耦(ou)就會(hui)接通，進行信(xin)號傳(chuan)遞，加大電(dian)(dian)(dian)(dian)(dian)(dian)流電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)的(de)(de)輸(shu)出(chu)。當(dang)變壓(ya)(ya)器(qi)提供(gong)的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)流和(he)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)高(gao)于穩壓(ya)(ya)管(guan)給出(chu)的(de)(de)標準電(dian)(dian)(dian)(dian)(dian)(dian)流電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)時，光(guang)(guang)耦(ou)關(guan)閉，對信(xin)號進行隔(ge)離，降低輸(shu)出(chu)電(dian)(dian)(dian)(dian)(dian)(dian)流和(he)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)。真(zhen)正的(de)(de)實(shi)現了而實(shi)現了“電—光—電”的(de)電路控制。

值得注意的是，光耦這個(ge)元器件還起(qi)到了保(bao)護電路的作(zuo)用，比如說(shuo)，一旦變壓器發生(sheng)故障，就會(hui)停止光耦電源的傳(chuan)輸(shu)，光(guang)耦就會關閉電流電壓的傳輸，對(dui)電(dian)路進行隔離(li)，從(cong)而保(bao)護(hu)開關管不被大電流擊穿燒毀(hui)。所以很多(duo)的電源(yuan)適配器(qi)廠家在(zai)生產電源(yuan)的時(shi)候都會(hui)應用光(guang)耦、電容電阻等元器(qi)件。

但是像一些小的(de)電(dian)(dian)源適(shi)配器廠家(jia)就(jiu)(jiu)沒(mei)有(you)那么多的(de)講究了，變壓(ya)器、電(dian)(dian)容、電(dian)(dian)阻等少量幾(ji)個元器件就(jiu)(jiu)組(zu)成了一個電(dian)(dian)源電(dian)(dian)路，不(bu)重視電(dian)(dian)路保護，充電(dian)(dian)安全難以保證。好(hao)品質，還得看(kan)大廠家(jia)！

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