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DC-DC電源模塊常見故障分析

  電源模塊是可以直接貼裝在電路板上的電源供應(yīng)器,其特點(diǎn)是可為專用集成電路、數(shù)字信號處理器、微處理器、存儲器、現(xiàn)場可編程門陣列及其他數(shù)字或模擬負(fù)載提供供電??煽啃愿呤瞧鋬?yōu)點(diǎn)!盡管電源模塊的可靠性比較高,但也可能發(fā)生故障,在DC-DC模塊中,一般可能發(fā)生的故障有5種,看小編總結(jié)!

  1、模塊在使用過程中輸出電壓降低;

  2、模塊停止工作;

  3、模塊輸出電壓過高;

  4、模塊輸入短路;

  5、模塊輸出電流過大。

  前兩種故障一般不會帶來很大危險,可以故障診斷電路檢測并報警。

  第三種失效方式比較危險,它可以燒毀應(yīng)用電路,一般通過過壓保護(hù)電路來實(shí)現(xiàn)過壓保護(hù),另外也可以在輸出端加穩(wěn)壓二極管來實(shí)現(xiàn)。設(shè)計(jì)時要合理選擇二極管的參數(shù),防止由于溫度不同造成穩(wěn)壓點(diǎn)的變化。有些模塊本身自帶過壓保護(hù)。一般來講,25W以下模塊無過壓保護(hù)功能,25W以上模塊內(nèi)部設(shè)計(jì)有過壓保護(hù)電路。過壓保護(hù)點(diǎn)一般設(shè)計(jì)為135%--145%額定電壓。詳細(xì)設(shè)計(jì)時要確認(rèn)模塊是否具有這些功能,以免重復(fù)設(shè)計(jì)。

  第四種會導(dǎo)致輸入過流,嚴(yán)重時燒壞印制板,一般可以通過在輸入端選擇合適的保險管進(jìn)行保護(hù)。保險管在布線時一般要布置在靠近電源模塊的輸入端,這樣設(shè)計(jì)的目的是降低輸入線的引線電感,避免保險管熔斷時,引線電感引起輸入端的過壓。

  第五種故障可以通過選擇帶有過流保護(hù)的電源模塊,一般的電源模塊都有過流保護(hù)功能,這種模塊在其內(nèi)部可以通過檢測變化器原邊或副邊電流來實(shí)現(xiàn),但要損失一定的效率。在進(jìn)行電壓模塊選擇時,不是功率額定越大越好。如果降額過大,則用戶板輔助短路時,由于傳輸壓降的存在,輸出電流不足以實(shí)現(xiàn)模塊過流,有可能引起芯片過熱甚至損壞。

  上述就是國創(chuàng)講解的DC-DC電源模塊常見故障分析,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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