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電源適配器故障如何排除?

  茄子視頻APP: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處理。那電源適配器故障如何排除?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(xian)路毛病(bing),包(bao)括電源線(xian)損壞不通電、接觸口氧化接觸不良等(deng)狀況。重點檢查輸(shu)(shu)入(ru)線(xian)、輸(shu)(shu)出線(xian)能否通電。

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

  二、輸出電壓過低

  以下為惹起輸出電(dian)壓低的(de)主(zhu)要緣由(you):

  2.1 開(kai)關(guan)電(dian)(dian)(dian)(dian)源負(fu)載(zai)短(duan)(duan)路(lu)毛(mao)病(bing)(特別是 DC/DC 變換器短(duan)(duan)路(lu)或(huo)性能不良(liang)等) ,此時,首(shou)先斷(duan)開(kai)開(kai)關(guan)電(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)路(lu)的一(yi)切負(fu)載(zai),檢查(cha)是開(kai)關(guan)電(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)路(lu)毛(mao)病(bing)還是負(fu)載(zai)電(dian)(dian)(dian)(dian)路(lu)有毛(mao)病(bing)。假如斷(duan)開(kai)負(fu)載(zai)電(dian)(dian)(dian)(dian)路(lu)而電(dian)(dian)(dian)(dian)壓輸(shu)出正常,闡明(ming)是負(fu)載(zai)過重;或(huo)仍不正常闡明(ming)開(kai)關(guan)電(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)路(lu)有毛(mao)病(bing)。

  2.2 輸出電壓端濾波(bo)電容(rong)或(huo)整流二極管失(shi)效等,能(neng)夠經過交換法停止判別。

  2.3 開(kai)關管(guan)(guan)的(de)性(xing)能(neng)降(jiang)落(luo),招致(zhi)開(kai)關管(guan)(guan)無法正常(chang)導通(tong),使電源(yuan)的(de)內(nei)阻(zu)增加,負載(zai)才能(neng)降(jiang)落(luo)。 2.4 開(kai)關變壓器不良(liang)(liang),不只形(xing)成輸出(chu)電壓降(jiang)落(luo),同時(shi)形(xing)成開(kai)關管(guan)(guan)鼓勵缺(que)乏從而損壞開(kai)關管(guan)(guan) 2.5 300V 濾波電容不良(liang)(liang),形(xing)成電源(yuan)帶負載(zai)才能(neng)差,一接負載(zai)輸出(chu)電壓便會降(jiang)落(luo)。

  三、輸出電壓過高

  輸出電(dian)(dian)(dian)壓(ya)過高普(pu)通來自于穩(wen)壓(ya)取樣和穩(wen)壓(ya)控制電(dian)(dian)(dian)路(lu)。在直流輸出、取樣電(dian)(dian)(dian)阻、誤差取樣放大(da)器如 TL431、光耦、電(dian)(dian)(dian)源(yuan)控制芯片等電(dian)(dian)(dian)路(lu)共(gong)同(tong)構(gou)成(cheng)的(de)閉合控制環路(lu),其中任何一(yi)個零件呈(cheng)現問題都會(hui)形成(cheng)輸出電(dian)(dian)(dian)壓(ya)升(sheng)高。

  四、保險管正常,無輸出電壓

  保(bao)險(xian)管正常,無輸出電(dian)壓標明開關(guan)電(dian)源未工(gong)作或進入(ru)了維護狀態。第一步要檢查(cha)電(dian)源控制芯片的(de)啟(qi)(qi)動(dong)腳的(de)啟(qi)(qi)動(dong)電(dian)壓的(de)數值, 若無啟(qi)(qi)動(dong)電(dian)壓或者啟(qi)(qi)動(dong)電(dian)壓過低, 則檢查(cha)啟(qi)(qi)動(dong)腳外接的(de)元(yuan)件(jian)及啟(qi)(qi)動(dong)電(dian)阻能否漏電(dian)。

  若電(dian)(dian)源控(kong)(kong)制芯(xin)片(pian)(pian)正常,可經上(shang)述(shu)監測疾(ji)速(su)查(cha)(cha)到毛(mao)病(bing)所在。若有啟動電(dian)(dian)壓,則丈量控(kong)(kong)制芯(xin)片(pian)(pian)的(de)輸(shu)出 端(duan)在開機霎時能否(fou)存(cun)在高(gao)、低電(dian)(dian)平的(de)跳(tiao)(tiao)變,如(ru)若無跳(tiao)(tiao)變,闡明控(kong)(kong)制芯(xin)片(pian)(pian)損(sun)壞(huai)、 外圍振(zhen)蕩電(dian)(dian)路元件損(sun)壞(huai)或維護(hu)電(dian)(dian)路存(cun)在毛(mao)病(bing),經過交換控(kong)(kong)制芯(xin)片(pian)(pian)、檢查(cha)(cha)外圍元件,逐一(yi)停止檢查(cha)(cha);若在跳(tiao)(tiao)變,多數狀況為(wei)為(wei)開關管不(bu)良或損(sun)壞(huai)。

  五、保險燒壞或炸掉

  主要檢查整流橋、各二極管、開(kai)關(guan)管以及(ji)300伏(fu)上的大濾波電(dian)容等(deng)部位。招(zhao)(zhao)致保(bao)險燒(shao)、發(fa)黑,也可能是抗干擾電(dian)路(lu)出問題惹(re)起。特(te)別值(zhi)得(de)留(liu)意(yi)的是:因開(kai)關(guan)管擊(ji)穿招(zhao)(zhao)致保(bao)險燒(shao),通常(chang)會燒(shao)壞電(dian)源(yuan)控制芯片和電(dian)流檢測電(dian)阻。熱敏電(dian)阻也很容易和保(bao)險一同被燒(shao)壞。

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