電源適配器作(zuo)為(wei)電(dian)氣設備的配(pei)套設施，一(yi)旦出現故障需要(yao)及早處(chu)理。那電(dian)源適(shi)配(pei)器故障如何排除?今天(tian)我們一(yi)起來簡單了解一(yi)下!

　　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(kou)氧化接觸(chu)不(bu)良等狀況(kuang)。重點(dian)檢查輸入(ru)線、輸出線能否通電。

　　若是線路毛(mao)病，可經過改(gai)換電(dian)源線等方式處理。

　　二、輸出電壓過低

　　以下為惹起輸出電壓低的主(zhu)要緣由：

　　2.1 開(kai)(kai)關電(dian)(dian)(dian)(dian)(dian)源負(fu)載短(duan)路(lu)毛(mao)病(bing)(特(te)別是 DC/DC 變換器短(duan)路(lu)或(huo)性能不(bu)良(liang)等) ，此時，首先(xian)斷開(kai)(kai)開(kai)(kai)關電(dian)(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)(dian)路(lu)的一(yi)切負(fu)載，檢查(cha)是開(kai)(kai)關電(dian)(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)(dian)路(lu)毛(mao)病(bing)還(huan)是負(fu)載電(dian)(dian)(dian)(dian)(dian)路(lu)有(you)毛(mao)病(bing)。假如斷開(kai)(kai)負(fu)載電(dian)(dian)(dian)(dian)(dian)路(lu)而電(dian)(dian)(dian)(dian)(dian)壓輸(shu)出正(zheng)常(chang)，闡明是負(fu)載過重(zhong);或(huo)仍不(bu)正(zheng)常(chang)闡明開(kai)(kai)關電(dian)(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)(dian)路(lu)有(you)毛(mao)病(bing)。

　　2.2 輸出電壓端濾波電容(rong)或整流二極(ji)管失效等，能夠經過交換法(fa)停止(zhi)判別。

　　2.3 開(kai)關管(guan)(guan)(guan)的性能(neng)降(jiang)落，招致開(kai)關管(guan)(guan)(guan)無(wu)法正常導通，使(shi)電源的內(nei)阻增加，負載(zai)才能(neng)降(jiang)落。 2.4 開(kai)關變壓(ya)器不(bu)良(liang)，不(bu)只形成輸出(chu)電壓(ya)降(jiang)落，同時形成開(kai)關管(guan)(guan)(guan)鼓勵缺乏(fa)從(cong)而損壞開(kai)關管(guan)(guan)(guan) 2.5 300V 濾波電容不(bu)良(liang)，形成電源帶(dai)負載(zai)才能(neng)差，一接(jie)負載(zai)輸出(chu)電壓(ya)便會降(jiang)落。

　　三、輸出電壓過高

　　輸出電(dian)(dian)壓過(guo)高普通來自(zi)于穩壓取樣和穩壓控(kong)制(zhi)電(dian)(dian)路。在(zai)直(zhi)流輸出、取樣電(dian)(dian)阻(zu)、誤(wu)差取樣放大(da)器如 TL431、光耦、電(dian)(dian)源(yuan)控(kong)制(zhi)芯(xin)片等電(dian)(dian)路共(gong)同構(gou)成的閉合控(kong)制(zhi)環路，其中(zhong)任何(he)一個零件呈現問題都會形成輸出電(dian)(dian)壓升高。

　　四、保險管正常，無輸出電壓

　　保險(xian)管正(zheng)常，無輸出電(dian)壓標明開關(guan)電(dian)源未工作或(huo)進(jin)入了維護狀(zhuang)態。第一步要檢(jian)查電(dian)源控制芯片的(de)(de)(de)啟(qi)動(dong)(dong)腳的(de)(de)(de)啟(qi)動(dong)(dong)電(dian)壓的(de)(de)(de)數值， 若無啟(qi)動(dong)(dong)電(dian)壓或(huo)者啟(qi)動(dong)(dong)電(dian)壓過低， 則檢(jian)查啟(qi)動(dong)(dong)腳外(wai)接的(de)(de)(de)元件及啟(qi)動(dong)(dong)電(dian)阻(zu)能否漏電(dian)。

　　若電(dian)源控(kong)制(zhi)芯片(pian)正常，可(ke)經上述監測(ce)疾(ji)速查到毛病所在(zai)。若有啟動電(dian)壓，則丈量控(kong)制(zhi)芯片(pian)的輸出 端在(zai)開機霎(sha)時能否存在(zai)高(gao)、低電(dian)平的跳(tiao)(tiao)變(bian)(bian)，如(ru)若無跳(tiao)(tiao)變(bian)(bian)，闡(chan)明(ming)控(kong)制(zhi)芯片(pian)損壞、 外圍振(zhen)蕩電(dian)路元(yuan)件損壞或維護電(dian)路存在(zai)毛病，經過交換(huan)控(kong)制(zhi)芯片(pian)、檢查外圍元(yuan)件，逐一(yi)停止檢查;若在(zai)跳(tiao)(tiao)變(bian)(bian)，多數狀況為為開關管不良或損壞。

　　五、保險燒壞或炸掉

　　主要檢查整流(liu)橋、各二極管、開關管以及300伏上的(de)大濾波電(dian)(dian)(dian)容等部位。招致保(bao)險燒、發黑，也可(ke)能是抗(kang)干擾電(dian)(dian)(dian)路出問題惹起(qi)。特別值(zhi)得留意的(de)是：因開關管擊穿招致保(bao)險燒，通常(chang)會燒壞(huai)電(dian)(dian)(dian)源控制芯片(pian)和電(dian)(dian)(dian)流(liu)檢測電(dian)(dian)(dian)阻。熱敏電(dian)(dian)(dian)阻也很容易和保(bao)險一同(tong)被燒壞(huai)。