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電源適配器故障如何排除?

  電源適配器作(zuo)為電氣設備的配套設施,一(yi)旦(dan)出(chu)現故障需要及早處(chu)理(li)。那電源適配器故障如何(he)排除?今天我(wo)們一(yi)起來簡單了解一(yi)下!

電源適配器故障如何排除?

  一、線路毛病

  線(xian)路毛病,包(bao)括電源(yuan)線(xian)損壞不通電、接觸(chu)口氧化接觸(chu)不良等狀況。重(zhong)點檢查輸入線(xian)、輸出(chu)線(xian)能否通電。

  若是線(xian)路毛(mao)病,可(ke)經過改換電源線(xian)等方式處理。

  二、輸出電壓過低

  以下(xia)為(wei)惹起輸(shu)出電(dian)壓低的主(zhu)要緣由:

  2.1 開(kai)(kai)關電(dian)(dian)(dian)(dian)源負載短(duan)路(lu)毛(mao)病(特別是(shi) DC/DC 變換器短(duan)路(lu)或(huo)性能不良等) ,此時,首先斷開(kai)(kai)開(kai)(kai)關電(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)路(lu)的一切(qie)負載,檢查是(shi)開(kai)(kai)關電(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)路(lu)毛(mao)病還(huan)是(shi)負載電(dian)(dian)(dian)(dian)路(lu)有(you)(you)毛(mao)病。假如斷開(kai)(kai)負載電(dian)(dian)(dian)(dian)路(lu)而(er)電(dian)(dian)(dian)(dian)壓輸出(chu)正常,闡明(ming)是(shi)負載過重;或(huo)仍不正常闡明(ming)開(kai)(kai)關電(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)路(lu)有(you)(you)毛(mao)病。

  2.2 輸出(chu)電壓端濾波(bo)電容(rong)或整(zheng)流二極管失效等,能夠經(jing)過(guo)交換法停止判別。

  2.3 開(kai)關(guan)(guan)管(guan)的(de)性能降(jiang)(jiang)(jiang)落(luo)(luo),招致(zhi)開(kai)關(guan)(guan)管(guan)無法正常導通,使電(dian)源(yuan)的(de)內阻(zu)增(zeng)加,負載才能降(jiang)(jiang)(jiang)落(luo)(luo)。 2.4 開(kai)關(guan)(guan)變壓器不(bu)良(liang),不(bu)只形(xing)成輸(shu)出(chu)電(dian)壓降(jiang)(jiang)(jiang)落(luo)(luo),同時形(xing)成開(kai)關(guan)(guan)管(guan)鼓勵缺乏從而損壞開(kai)關(guan)(guan)管(guan) 2.5 300V 濾波電(dian)容不(bu)良(liang),形(xing)成電(dian)源(yuan)帶負載才能差,一接負載輸(shu)出(chu)電(dian)壓便會(hui)降(jiang)(jiang)(jiang)落(luo)(luo)。

  三、輸出電壓過高

  輸出電(dian)(dian)壓(ya)過高普通(tong)來自(zi)于(yu)穩壓(ya)取(qu)樣(yang)和穩壓(ya)控(kong)(kong)制電(dian)(dian)路(lu)。在直(zhi)流輸出、取(qu)樣(yang)電(dian)(dian)阻、誤差(cha)取(qu)樣(yang)放大(da)器(qi)如 TL431、光耦、電(dian)(dian)源控(kong)(kong)制芯片等電(dian)(dian)路(lu)共同構(gou)成的閉合(he)控(kong)(kong)制環(huan)路(lu),其中任何一個(ge)零件呈現(xian)問題都會形成輸出電(dian)(dian)壓(ya)升高。

  四、保險管正常,無輸出電壓

  保險管(guan)正(zheng)常,無輸出電(dian)(dian)(dian)(dian)壓標明(ming)開(kai)關(guan)電(dian)(dian)(dian)(dian)源未工(gong)作(zuo)或進入了(le)維護狀態。第一步(bu)要(yao)檢查(cha)電(dian)(dian)(dian)(dian)源控(kong)制芯片的(de)(de)(de)啟(qi)(qi)動腳的(de)(de)(de)啟(qi)(qi)動電(dian)(dian)(dian)(dian)壓的(de)(de)(de)數(shu)值, 若無啟(qi)(qi)動電(dian)(dian)(dian)(dian)壓或者啟(qi)(qi)動電(dian)(dian)(dian)(dian)壓過(guo)低, 則檢查(cha)啟(qi)(qi)動腳外接的(de)(de)(de)元件及啟(qi)(qi)動電(dian)(dian)(dian)(dian)阻能否漏電(dian)(dian)(dian)(dian)。

  若(ruo)電(dian)源控制芯(xin)片正(zheng)常,可(ke)經上(shang)述監(jian)測疾速查到毛病(bing)(bing)所(suo)在(zai)(zai)。若(ruo)有啟(qi)動電(dian)壓(ya),則丈量控制芯(xin)片的輸出 端在(zai)(zai)開機霎時能否存在(zai)(zai)高(gao)、低電(dian)平的跳(tiao)變(bian),如若(ruo)無跳(tiao)變(bian),闡明控制芯(xin)片損(sun)壞(huai)(huai)、 外(wai)圍振(zhen)蕩(dang)電(dian)路元(yuan)件(jian)損(sun)壞(huai)(huai)或維(wei)護電(dian)路存在(zai)(zai)毛病(bing)(bing),經過交換控制芯(xin)片、檢查外(wai)圍元(yuan)件(jian),逐一(yi)停止檢查;若(ruo)在(zai)(zai)跳(tiao)變(bian),多數(shu)狀況為為開關管不良或損(sun)壞(huai)(huai)。

  五、保險燒壞或炸掉

  主要檢查整流橋、各二(er)極管(guan)、開(kai)關管(guan)以及300伏上的大濾波電(dian)容等部位。招致保險(xian)(xian)燒(shao)、發黑,也可能是抗干擾電(dian)路出問題惹起。特別值得留意的是:因開(kai)關管(guan)擊穿招致保險(xian)(xian)燒(shao),通常會(hui)燒(shao)壞(huai)(huai)電(dian)源控制芯片和電(dian)流檢測電(dian)阻。熱敏(min)電(dian)阻也很(hen)容易和保險(xian)(xian)一同被燒(shao)壞(huai)(huai)。

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