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電源模塊常見故障排除方法

  電源?模塊是將其它形式的能轉(zhuǎn)換成電能的裝置。其工作原理是發(fā)電機(jī)能把機(jī)械能轉(zhuǎn)換成電能,干電池能把化學(xué)能轉(zhuǎn)換成電能。電源模塊常見故障排除如何排除呢?看國創(chuàng)小編整理分享!

  輸入電壓過高

  針對電源模輸入?yún)?shù)異?!斎腚妷哼^高。這中異常輕則導(dǎo)致系統(tǒng)無法正常工作,重則會(huì)燒毀電路。那么輸入電壓過高通常是那些原因造成的呢?

  輸出端懸空或無負(fù)載;輸出端負(fù)載過輕,輕于10%的額定負(fù)載;輸入電壓偏高或干擾電壓。

  針對這一類問題,可以通過調(diào)整輸出端的負(fù)載或調(diào)整輸入電壓范圍,具體如下所示:

  確保輸出端不小于少10%的額定負(fù)載,若實(shí)際電路工作中會(huì)有空載現(xiàn)象,就在輸出端并接一個(gè)額定功率10%的假負(fù)載;更換一個(gè)合理范圍的輸入電壓,存在干擾電壓時(shí)要考慮在輸入端并上TVS管或穩(wěn)壓管。

  輸出電壓過低

  針對電源模輸出參數(shù)異?!敵鲭妷哼^低。這可能會(huì)導(dǎo)致整體系統(tǒng)不能正常工作,如微控制器系統(tǒng)中,負(fù)載突然增大,會(huì)拉低微控制器供電電壓,容易造成復(fù)位。并且電源長時(shí)間工作在低輸入電壓情況下,電路的壽命也會(huì)出現(xiàn)極大的折損。因此輸出電壓偏低的問題是不容忽視的,那么輸出電壓過低通常是那些原因造成的呢?

  輸入電壓較低或功率不足;輸出線路過長或過細(xì),造成線損過大;輸入端的防反接二極管壓降過大;

  輸入濾波電感過大

  針對這一類問題,可以通過調(diào)整供電或者更換相應(yīng)的外圍電路來改善,調(diào)高電壓或換用更大功率輸入電源;

  調(diào)整布線,增大導(dǎo)線截面積或縮短導(dǎo)線長度,減小內(nèi)阻;換用導(dǎo)通壓降小的二極管;減小濾波電感值或降低電感的內(nèi)阻。

  輸出噪聲過大

  針對電源模輸出參數(shù)異常——輸出紋波噪聲過大。眾所周知,噪聲是衡量電源模塊優(yōu)劣的一大關(guān)鍵指標(biāo),在應(yīng)用電路中,模塊的設(shè)計(jì)布局等也會(huì)影響輸出噪聲,那么輸出紋波噪聲過大通常是那些原因造成的呢?

  電源模塊與主電路噪聲敏感元件距離過近;主電路噪聲敏感元件的電源輸入端處未接去耦電容;多路系統(tǒng)中各單路輸出的電源模塊之間產(chǎn)生差頻干擾;地線處理不合理。

  上述就是國創(chuàng)講解的電源模塊常見故障排除方法,希望看完能夠?qū)δ兴鶐椭?,如果您想要了解更多關(guān)于電源模塊的相關(guān)信息的話,歡迎在線咨詢我們國創(chuàng)客服或是撥打服務(wù)熱線029-85251919進(jìn)行咨詢,我們將竭誠為您提供優(yōu)質(zhì)的服務(wù)!
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