本論文主要為研究「降壓饋入式同步倍流整流半橋轉換器」，研製低電壓大電流電源轉換器，並探討此電路之特性與優缺點。本論文首先討論同步倍流整流器之動作原理，其次是分析對稱半橋轉換器操作於責任週期50%之工作原理，並做穩態分析與怠滯時間分析。最後實作一部「降壓饋入式同步倍流整流半橋轉換器」，轉換器之輸入電壓為36~ 72V，輸出為1.5V/70A，當輸入電壓為48V時，滿載效率為79.1%；當輸出電流為20A時，轉換器之效率可達88.7%。

Buck fed half-bridge topology is very suitable for low voltage and high current applications. The analysis of synchronous current-doubler rectification is studied in this thesis. Also, the operating principle and characteristics of symmetrical half-bridge converter with 50% duty is discussed. The ZVS condition of buck fed half-bridge converter is investigated in detail. Finally, a buck fed half-bridge converter with 36~72VDC input voltage range and 1.5V/70A output is performed. The experimental results show that the efficiency of the proposed is 79.1% at the full-load condition and the maximum efficiency is 88.7% at 20A output current.

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