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電源適配器故障如何排除?

  電源適配器作為電氣設備的配套設施,一旦出現故障需要及早(zao)處理(li)。那電源適配器(qi)故障如何排除?今天我們一起來簡單了解一下!

電源適配器故障如何排除?

  一、線路毛病

  線路毛病,包括(kuo)電源(yuan)線損壞不(bu)通電、接觸(chu)口氧化接觸(chu)不(bu)良(liang)等狀(zhuang)況。重點檢查輸入線、輸出線能否通電。

  若是線(xian)路毛病,可經過(guo)改換(huan)電源(yuan)線(xian)等方式(shi)處理。

  二、輸出電壓過低

  以(yi)下(xia)為惹起輸出(chu)電壓低(di)的主(zhu)要緣(yuan)由:

  2.1 開關(guan)電(dian)(dian)源負載(zai)短路(lu)(lu)毛(mao)病(特別是 DC/DC 變換器短路(lu)(lu)或性能不良等) ,此時,首先斷開開關(guan)電(dian)(dian)源電(dian)(dian)路(lu)(lu)的(de)一切負載(zai),檢(jian)查(cha)是開關(guan)電(dian)(dian)源電(dian)(dian)路(lu)(lu)毛(mao)病還是負載(zai)電(dian)(dian)路(lu)(lu)有(you)毛(mao)病。假如(ru)斷開負載(zai)電(dian)(dian)路(lu)(lu)而電(dian)(dian)壓(ya)輸出(chu)正常(chang),闡(chan)明是負載(zai)過重(zhong);或仍不正常(chang)闡(chan)明開關(guan)電(dian)(dian)源電(dian)(dian)路(lu)(lu)有(you)毛(mao)病。

  2.2 輸出(chu)電壓端濾波電容或整流(liu)二極管失效等,能夠經(jing)過交換(huan)法停(ting)止判別。

  2.3 開關(guan)管(guan)的(de)性能(neng)降(jiang)落(luo),招致開關(guan)管(guan)無(wu)法正(zheng)常導通,使電源的(de)內阻增加,負載(zai)(zai)才(cai)(cai)能(neng)降(jiang)落(luo)。 2.4 開關(guan)變壓器(qi)不良,不只(zhi)形成輸出電壓降(jiang)落(luo),同時形成開關(guan)管(guan)鼓勵(li)缺(que)乏(fa)從(cong)而(er)損壞(huai)開關(guan)管(guan) 2.5 300V 濾(lv)波(bo)電容不良,形成電源帶負載(zai)(zai)才(cai)(cai)能(neng)差(cha),一(yi)接負載(zai)(zai)輸出電壓便會降(jiang)落(luo)。

  三、輸出電壓過高

  輸(shu)出(chu)電(dian)壓(ya)過(guo)高普通(tong)來自(zi)于(yu)穩壓(ya)取樣和穩壓(ya)控(kong)(kong)制(zhi)電(dian)路。在(zai)直流輸(shu)出(chu)、取樣電(dian)阻(zu)、誤差取樣放大器如 TL431、光耦、電(dian)源控(kong)(kong)制(zhi)芯片等電(dian)路共同(tong)構成的閉(bi)合控(kong)(kong)制(zhi)環路,其中任何一個零件(jian)呈現問題都會形成輸(shu)出(chu)電(dian)壓(ya)升高。

  四、保險管正常,無輸出電壓

  保(bao)險管(guan)正常(chang),無(wu)(wu)輸(shu)出電(dian)(dian)(dian)壓標明開關電(dian)(dian)(dian)源(yuan)未(wei)工作或進(jin)入了維護狀態。第一(yi)步要檢(jian)查電(dian)(dian)(dian)源(yuan)控制芯片的(de)(de)啟(qi)(qi)動(dong)(dong)腳的(de)(de)啟(qi)(qi)動(dong)(dong)電(dian)(dian)(dian)壓的(de)(de)數值, 若無(wu)(wu)啟(qi)(qi)動(dong)(dong)電(dian)(dian)(dian)壓或者啟(qi)(qi)動(dong)(dong)電(dian)(dian)(dian)壓過(guo)低, 則檢(jian)查啟(qi)(qi)動(dong)(dong)腳外接的(de)(de)元件及(ji)啟(qi)(qi)動(dong)(dong)電(dian)(dian)(dian)阻(zu)能否漏電(dian)(dian)(dian)。

  若(ruo)(ruo)電(dian)(dian)源控(kong)制(zhi)芯(xin)(xin)片(pian)正常,可經上述監測疾速查到毛病所在。若(ruo)(ruo)有啟動電(dian)(dian)壓,則丈量控(kong)制(zhi)芯(xin)(xin)片(pian)的輸出 端在開機霎(sha)時能否存(cun)在高、低電(dian)(dian)平的跳(tiao)(tiao)變,如若(ruo)(ruo)無跳(tiao)(tiao)變,闡明控(kong)制(zhi)芯(xin)(xin)片(pian)損壞、 外(wai)圍振蕩電(dian)(dian)路元件(jian)損壞或維護電(dian)(dian)路存(cun)在毛病,經過交換控(kong)制(zhi)芯(xin)(xin)片(pian)、檢查外(wai)圍元件(jian),逐一(yi)停止檢查;若(ruo)(ruo)在跳(tiao)(tiao)變,多數狀況為為開關管不(bu)良或損壞。

  五、保險燒壞或炸掉

  主(zhu)要檢(jian)查整流橋、各二極管、開(kai)關管以(yi)及300伏上的大(da)濾(lv)波電(dian)(dian)容等部位。招(zhao)致保(bao)險(xian)燒(shao)、發(fa)黑,也可(ke)能是(shi)抗干擾電(dian)(dian)路出問題惹(re)起。特別值得留意的是(shi):因開(kai)關管擊(ji)穿(chuan)招(zhao)致保(bao)險(xian)燒(shao),通常會燒(shao)壞電(dian)(dian)源控(kong)制(zhi)芯片(pian)和電(dian)(dian)流檢(jian)測電(dian)(dian)阻。熱敏電(dian)(dian)阻也很容易和保(bao)險(xian)一同被燒(shao)壞。

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