如今，開關(guan)電(dian)源(yuan)現(xian)已普及到日(ri)常生活的(de)方方面(mian)面(mian)。無論處于(yu)哪(na)個生活環境里(li)邊，只要有(you)用電(dian)設備就都會發(fa)現(xian)開關(guan)電(dian)源(yuan)的(de)身(shen)影。其實有(you)需求用電(dian)的(de)當地就會看(kan)到開關(guan)電(dian)源(yuan)在附近了。接(jie)下(xia)來，說下(xia)開關(guan)電(dian)源(yuan)不起振(zhen)的(de)原因于(yu)咱們解解惑。

首要(yao)咱們先來看看開關電源(yuan)為什(shen)么(me)要(yao)起振，起振有(you)什(shen)么(me)用(yong)？

開關電源起振作用

開(kai)(kai)(kai)關電(dian)(dian)(dian)(dian)源，便(bian)是(shi)(shi)(shi)一個溝(gou)通(tong)變(bian)(bian)直(zhi)(zhi)流(liu)(liu)(liu)，然后(hou)直(zhi)(zhi)流(liu)(liu)(liu)再變(bian)(bian)成溝(gou)通(tong)，溝(gou)通(tong)再變(bian)(bian)直(zhi)(zhi)流(liu)(liu)(liu)的(de)(de)的(de)(de)進(jin)程。不(bu)安穩的(de)(de)溝(gou)通(tong)市電(dian)(dian)(dian)(dian)首要(yao)經過(guo)整流(liu)(liu)(liu)濾波(bo)變(bian)(bian)成直(zhi)(zhi)流(liu)(liu)(liu)，供電(dian)(dian)(dian)(dian)子電(dian)(dian)(dian)(dian)路(lu)(lu)工作(zuo)(zuo)，這個電(dian)(dian)(dian)(dian)路(lu)(lu)包括高頻(pin)振(zhen)蕩電(dian)(dian)(dian)(dian)路(lu)(lu)，也便(bian)是(shi)(shi)(shi)將直(zhi)(zhi)流(liu)(liu)(liu)變(bian)(bian)成頻(pin)率(lv)或脈寬可變(bian)(bian)的(de)(de)脈沖，這部分(fen)在開(kai)(kai)(kai)關電(dian)(dian)(dian)(dian)路(lu)(lu)中很(hen)重(zhong)要(yao)，輸(shu)入電(dian)(dian)(dian)(dian)壓(ya)變(bian)(bian)化或負(fu)載增大變(bian)(bian)小，振(zhen)蕩電(dian)(dian)(dian)(dian)路(lu)(lu)會經過(guo)調整頻(pin)率(lv)或脈寬來堅(jian)持輸(shu)出(chu)安穩。這便(bian)是(shi)(shi)(shi)它的(de)(de)作(zuo)(zuo)用，要(yao)想起(qi)到這個作(zuo)(zuo)用當然就(jiu)要(yao)起(qi)振(zhen)了，不(bu)起(qi)振(zhen)就(jiu)闡明開(kai)(kai)(kai)關電(dian)(dian)(dian)(dian)源出(chu)毛(mao)病了，也不(bu)會有輸(shu)出(chu)了。

那開關電源(yuan)為(wei)什(shen)么會不起振呢？

開(kai)關(guan)電源不起振原(yuan)因有：

1，初級(ji)（電(dian)源）電(dian)壓(ya)過(guo)高或過(guo)低

2，啟動電路開路

3，電(dian)源IC供電(dian)腳短路或開路

4，電源IC損壞

5，光耦短路

6，開關變壓器匝間短路

7，尖峰吸收(shou)電(dian)路(lu)短路(lu)（有(you)維(wei)護功用(yong)的電(dian)源）

8，脈寬調制(zhi)管短路（A3電源）

9，輸出短路

10，熱端電解電容壞

以(yi)上(shang)便是(shi)開關電源不(bu)起振的原因了。