電源適配器故障如何排除?
電源適配器作為電(dian)氣設備的配套設施,一旦出現(xian)故障(zhang)需要(yao)及早處理。那電(dian)源適配器故障(zhang)如何排除?今天我們一起來簡單了解一下!
一、線路毛病
線(xian)(xian)路毛病,包括電(dian)(dian)(dian)源線(xian)(xian)損壞不通電(dian)(dian)(dian)、接觸(chu)口氧化(hua)接觸(chu)不良等狀(zhuang)況(kuang)。重點檢(jian)查(cha)輸入線(xian)(xian)、輸出線(xian)(xian)能否通電(dian)(dian)(dian)。
若是線路(lu)毛病,可(ke)經過(guo)改換電源線等方式處理。
二、輸出電壓過低
以下為惹起(qi)輸(shu)出電壓低的主(zhu)要(yao)緣由:
2.1 開(kai)關電(dian)(dian)(dian)源(yuan)負(fu)(fu)載(zai)短(duan)路(lu)毛(mao)(mao)病(bing)(特別是 DC/DC 變換器(qi)短(duan)路(lu)或性能不(bu)良等) ,此(ci)時,首(shou)先斷開(kai)開(kai)關電(dian)(dian)(dian)源(yuan)電(dian)(dian)(dian)路(lu)的(de)一切負(fu)(fu)載(zai),檢查是開(kai)關電(dian)(dian)(dian)源(yuan)電(dian)(dian)(dian)路(lu)毛(mao)(mao)病(bing)還(huan)是負(fu)(fu)載(zai)電(dian)(dian)(dian)路(lu)有(you)毛(mao)(mao)病(bing)。假如斷開(kai)負(fu)(fu)載(zai)電(dian)(dian)(dian)路(lu)而電(dian)(dian)(dian)壓輸出正常,闡(chan)明(ming)是負(fu)(fu)載(zai)過重;或仍不(bu)正常闡(chan)明(ming)開(kai)關電(dian)(dian)(dian)源(yuan)電(dian)(dian)(dian)路(lu)有(you)毛(mao)(mao)病(bing)。
2.2 輸出電壓端濾波電容或整(zheng)流二極管失效(xiao)等,能夠經過交(jiao)換法停止判別。
2.3 開關(guan)(guan)管的(de)性能(neng)降落,招致(zhi)開關(guan)(guan)管無法(fa)正常導通(tong),使(shi)電源的(de)內阻增加,負載才(cai)能(neng)降落。 2.4 開關(guan)(guan)變(bian)壓器不(bu)良(liang),不(bu)只(zhi)形(xing)成輸(shu)出電壓降落,同時形(xing)成開關(guan)(guan)管鼓勵缺(que)乏從(cong)而(er)損壞開關(guan)(guan)管 2.5 300V 濾波電容不(bu)良(liang),形(xing)成電源帶負載才(cai)能(neng)差,一接負載輸(shu)出電壓便(bian)會降落。
三、輸出電壓過高
輸(shu)出(chu)(chu)電壓過高普通來(lai)自于穩壓取(qu)樣(yang)和穩壓控(kong)制(zhi)電路。在直(zhi)流輸(shu)出(chu)(chu)、取(qu)樣(yang)電阻、誤差取(qu)樣(yang)放(fang)大(da)器如 TL431、光耦、電源控(kong)制(zhi)芯片(pian)等電路共同(tong)構成(cheng)的閉合控(kong)制(zhi)環路,其中任何一個零件呈現問(wen)題都會(hui)形成(cheng)輸(shu)出(chu)(chu)電壓升高。
四、保險管正常,無輸出電壓
保險管正常,無輸出電(dian)(dian)壓(ya)(ya)標明開關電(dian)(dian)源未工作或進(jin)入了維護狀(zhuang)態。第一步要檢查電(dian)(dian)源控制芯片(pian)的啟(qi)(qi)動(dong)(dong)腳(jiao)(jiao)的啟(qi)(qi)動(dong)(dong)電(dian)(dian)壓(ya)(ya)的數(shu)值, 若(ruo)無啟(qi)(qi)動(dong)(dong)電(dian)(dian)壓(ya)(ya)或者啟(qi)(qi)動(dong)(dong)電(dian)(dian)壓(ya)(ya)過低, 則檢查啟(qi)(qi)動(dong)(dong)腳(jiao)(jiao)外接的元件及啟(qi)(qi)動(dong)(dong)電(dian)(dian)阻能否漏電(dian)(dian)。
若電源控制芯片正常,可(ke)經(jing)上述監測疾速查(cha)到毛(mao)病(bing)所(suo)在(zai)。若有啟動(dong)電壓(ya),則丈量控制芯片的(de)輸出 端在(zai)開機(ji)霎(sha)時能否存在(zai)高(gao)、低電平的(de)跳(tiao)變,如若無(wu)跳(tiao)變,闡明控制芯片損壞(huai)、 外圍(wei)振蕩電路元件(jian)損壞(huai)或維(wei)護電路存在(zai)毛(mao)病(bing),經(jing)過交換控制芯片、檢查(cha)外圍(wei)元件(jian),逐一(yi)停止檢查(cha);若在(zai)跳(tiao)變,多(duo)數(shu)狀況(kuang)為為開關管不良或損壞(huai)。
五、保險燒壞或炸掉
主(zhu)要檢(jian)查(cha)整流橋、各二極管(guan)、開關(guan)(guan)管(guan)以及300伏上的大濾波(bo)電(dian)容(rong)等(deng)部位。招(zhao)致保(bao)險(xian)(xian)燒(shao)、發黑,也可能是(shi)抗干擾電(dian)路出(chu)問題(ti)惹起。特(te)別值得(de)留意(yi)的是(shi):因開關(guan)(guan)管(guan)擊(ji)穿招(zhao)致保(bao)險(xian)(xian)燒(shao),通常會燒(shao)壞(huai)電(dian)源控制芯片(pian)和電(dian)流檢(jian)測電(dian)阻(zu)。熱(re)敏電(dian)阻(zu)也很(hen)容(rong)易和保(bao)險(xian)(xian)一(yi)同被燒(shao)壞(huai)。