變頻電源維修常見“壞毛病”
常見毛病包(bao)括：無顯現(xian)、無輸出、過(guo)熱、過(guo)載(zai)、欠壓、負載(zai)、輸出短路、風扇毛病、電(dian)池(chi)異常、超載(zai)、模塊損壞等毛病。
1. 無輸出，穩妥管正常 這種現象闡明開關電源未作業或進入了保護狀態(tai)。首先(xian)要(yao)丈量電(dian)(dian)(dian)(dian)(dian)源操控(kong)芯(xin)(xin)片(pian)(pian)(pian)(pian)的(de)(de)發(fa)動(dong)(dong)腳(jiao)是否有(you)(you)發(fa)動(dong)(dong)電(dian)(dian)(dian)(dian)(dian)壓，若(ruo)無發(fa)動(dong)(dong)電(dian)(dian)(dian)(dian)(dian)壓或者發(fa)動(dong)(dong)電(dian)(dian)(dian)(dian)(dian)壓太低，則要(yao)查看發(fa)動(dong)(dong)電(dian)(dian)(dian)(dian)(dian)阻和(he)發(fa)動(dong)(dong)腳(jiao)外接(jie)的(de)(de)元件是否漏電(dian)(dian)(dian)(dian)(dian)，此刻如電(dian)(dian)(dian)(dian)(dian)源操控(kong)芯(xin)(xin)片(pian)(pian)(pian)(pian)正(zheng)常，則經上述查看能(neng)夠迅速查到(dao)毛病。若(ruo)有(you)(you)發(fa)動(dong)(dong)電(dian)(dian)(dian)(dian)(dian)壓，則丈量操控(kong)芯(xin)(xin)片(pian)(pian)(pian)(pian)的(de)(de)輸出(chu)端在(zai)開機(ji)瞬間是否有(you)(you)高、低電(dian)(dian)(dian)(dian)(dian)平(ping)的(de)(de)跳變，若(ruo)無跳變，闡明操控(kong)芯(xin)(xin)片(pian)(pian)(pian)(pian)壞、外圍振(zhen)蕩電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)元件或保護電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)有(you)(you)問題，可先(xian)代換(huan)操控(kong)芯(xin)(xin)片(pian)(pian)(pian)(pian)，再查看外圍元件;若(ruo)有(you)(you)跳變，一般為(wei)開關管不(bu)良或損(sun)壞。
2. 穩妥燒(shao)或炸 主要(yao)查看300V上的(de)大濾波電(dian)容、整流(liu)(liu)橋各二(er)極(ji)管及開關管等部位，抗干擾電(dian)路出問(wen)題也會導(dao)致穩妥燒(shao)、發黑。需求注意的(de)是：因開關管擊穿導(dao)致穩妥燒(shao)一(yi)般(ban)會把電(dian)流(liu)(liu)檢測電(dian)阻(zu)(zu)和(he)電(dian)源操控芯片燒(shao)壞(huai)。負溫度系(xi)數熱(re)敏電(dian)阻(zu)(zu)也很容易和(he)穩妥一(yi)起被(bei)燒(shao)壞(huai)。
3. 有(you)輸出(chu)電(dian)壓(ya)，但(dan)輸出(chu)電(dian)壓(ya)過(guo)高(gao)(gao) 這種毛(mao)病一(yi)般來自于穩壓(ya)取(qu)樣(yang)(yang)和穩壓(ya)操(cao)控電(dian)路。在(zai)直流輸出(chu)、取(qu)樣(yang)(yang)電(dian)阻、差錯(cuo)取(qu)樣(yang)(yang)放大器如TL431、光耦、電(dian)源(yuan)操(cao)控芯片等電(dian)路共同構成一(yi)個(ge)閉合(he)的操(cao)控環路，任(ren)何一(yi)處(chu)出(chu)問題(ti)就會導致輸出(chu)電(dian)壓(ya)升高(gao)(gao)。
4. 輸出電壓過(guo)低 除穩(wen)壓操控電路會引起輸出電壓低，還有下面一(yi)些原因也會引起輸出電壓低：
5. 電源負載有短路毛病（特別是DC/DC變換器短路或功能不良等），此刻，應該斷開開關電源電路的一切負載，以區分是開關電源電路仍是負載電路有毛病。若斷開負載電路電壓輸出正常，闡明是負載過重;或仍不正常闡明開關電源電路有毛病。
6. 輸出(chu)電(dian)壓端整流二(er)極管(guan)、濾波(bo)電(dian)容失效等，能夠(gou)經過代換法進行判別(bie)。
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