本論文主要研究降壓同步倍流整流半橋轉換器零電壓切換之特性，並達成全範圍負載零電壓切換之效果。文中首先探討責任週期50%之同步倍流整流對稱半橋轉換器在各種不同狀態下之基本動作原理，最後對電路之零電壓切換特性、責任週期損失與電路參數的影響作分析，作出全範圍負載零電壓切換之設計準則。
　　文中並實作一全範圍負載零電壓切換之降壓同步倍流整流半橋轉換器，其輸入電壓為36~ 72V，輸出為3.3V/50A，以實驗結果驗證理論分析。

　　We have considered zero voltage switching(ZVS) operation of the buck fed half-bridge converter with synchronous current- doubler rectification and achieved ZVS in full load range. First, the basic operation principle of the symmetrical half converter with synchronous current- doubler rectification in different state is described in the thesis, and the ZVS operation, duty cycle loss and the effect of the circuit parameters are analyzed. The design consideration for ZVS in full load range is proposed.
　　A buck fed half bridge converter with synchronous current-doubler rectification with input voltage range 36~72V and 3.3V/50A output is experimentally performed. The maximum efficiency is 89.66%, which demonstrates the performance of the proposed technique.

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