AO204/SI
AO204/SI
AO204/SI
《聯系人；歐先生》
《座機：0592-5709825》
《傳真：0592-5917519》
《24小時熱線：18030229053微信同步》
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從工業領域到建筑工程，簡單易用的開關模式電源非常常見。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，不管是調節的還是未調節的，都是首先在次級產生的。相比之下，開關電源是首先在初級進行整流，然后產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%的額定范圍內連續工作。
圖2: 無輸入濾波器的開關電源原理圖
在思考開關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，將會發生什么？假設所有模塊都能“準確”運行，那么幾乎所有開關電源都可以直流電或者交流電輸入。然而，當發生故障，一臺不適用于直流電輸入的開關電源，很有可能導致火災，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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