本論文旨在研製一「三階相移式零電壓切換電源轉換器」，此轉換器使用的功率開關耐壓為輸入電壓之一半，而且採用相移控制技術，可達成功率開關之零電壓切換，大幅降低轉換器切換損失。本文首先說明轉換器之動作原理，並分析穩態特性，同時也提出轉換器元件設計之流程。最後，本文完成一具零電壓切換特性之相移式電源轉換器，其輸入電壓為400V，輸出為48V/20A，實測結果顯示，轉換器的滿載效率為86.4%，當輸出為13A 時，最佳效率可達90.0%。

In this thesis, a three-level phase-shifted zero-voltage-switching power converter is studied and implemented. The voltage across the switches is half of the input voltage. Thus, the problem of choosing switches at high power applications is improved. The converter uses the well-known phase-shift control to achieve zero voltage switching (ZVS), and it reduces the switching loss. The detailed operational principle and analysis of the three-level phase-shifted zero-voltage switching power converter are described in this thesis. In addition, the process of designing components in this converter is discussed. Finally, this thesis performs a three-level phase-shifted zero-voltage-switching power converter with 400VDC input voltage and 48VDC/20A output. The experimental results show that the efficiency of the converter is 86.4% at the full-load condition and the maximum efficiency is 90.0%.

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