AO204/SI
AO204/SI
AO204/SI
《聯(lián)系人；歐先生》
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從工業(yè)領(lǐng)域到建筑工程，簡單易用的開關(guān)模式電源非常常見。直流電壓隨后被緩沖至電池，成為隨時可用的安全電力供給。事實如此簡單嗎？
工頻電源工作總是離不開變壓器。輸出的直流電，不管是調(diào)節(jié)的還是未調(diào)節(jié)的，都是首先在次級產(chǎn)生的。相比之下，開關(guān)電源是首先在初級進行整流，然后產(chǎn)生的直流電壓被分割為高頻，并通過一個小的高頻變壓器被傳送到次級（圖2）。開關(guān)電源允許寬范圍的輸入，還允許負載電流在0-100%的額定范圍內(nèi)連續(xù)工作。
圖2: 無輸入濾波器的開關(guān)電源原理圖
在思考開關(guān)電源的輸入電路原理時，首先注意到的就是整流器。如果輸入不是交流電，而是直流電，將會發(fā)生什么？假設(shè)所有模塊都能“準(zhǔn)確”運行，那么幾乎所有開關(guān)電源都可以直流電或者交流電輸入。然而，當(dāng)發(fā)生故障，一臺不適用于直流電輸入的開關(guān)電源，很有可能導(dǎo)致火災(zāi)，因為處理高壓直流電比起處理交流電要危險得多。
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