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(jiǎn)單易用的開(kāi)關(guān)模式電源非常常見(jiàn)。直流電壓隨后被緩沖至電池，成為隨時(shí)可用的安全電力供給。事實(shí)如此簡(jiǎn)單嗎？
工頻電源工作總是離不開(kāi)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(jí)產(chǎn)生的。相比之下，開(kāi)關(guān)電源是首先在初級(jí)進(jìn)行整流，然后產(chǎn)生的直流電壓被分割為高頻，并通過(guò)一個(gè)小的高頻變壓器被傳送到次級(jí)（圖2）。開(kāi)關(guān)電源允許寬范圍的輸入，還允許負(fù)載電流在0-100%的額定范圍內(nèi)連續(xù)工作。
圖2: 無(wú)輸入濾波器的開(kāi)關(guān)電源原理圖
在思考開(kāi)關(guān)電源的輸入電路原理時(shí)，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(huì)發(fā)生什么？假設(shè)所有模塊都能“準(zhǔn)確”運(yùn)行，那么幾乎所有開(kāi)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(tái)不適用于直流電輸入的開(kāi)關(guān)電源，很有可能導(dǎo)致火災(zāi)，因?yàn)樘幚砀邏褐绷麟姳绕鹛幚斫涣麟娨ｋU(xiǎn)得多。
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