本論文主要研究「零電流切換雙開關順向式轉換器」，並以此架構做為雙級式電源供應器之後級，其前級為功因修正電路。後級轉換器之雙開關其電壓應力低，且轉換器應用準諧振技術，可減少開關之切換損失。本文首先探討各類型順向式轉換器之電路特性與優缺點，並分析本文所採用之轉換器工作原理與設計流程。最後實作一雙級式電源供應器，其輸入交流電壓為90 V~264 V，輸出為直流24 V/10 A，並由實驗結果驗證系統之分析。

In this thesis, a two-stage AC-DC power supply is studied and implemented. The front stage is a power factor correction AC-DC boost converter, and the rear stage is a two-switch forward DC-DC converter, which is suitable in the high input voltage applications. Also, the quasi-resonant technology is applied to this converter to reduce the switching losses and improve efficiency. First, the characteristics of forward converters are discussed. Secondly, the operation principles and design process of the two-switch forward converter are analysis. Finally, the two-stage power supply with universal AC input voltage 90 V~264 V, DC output voltage 24 V, and DC output current 10 A is implemented to verify the performance of the propose circuit.

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