本論文主要研製一適用於個人電腦之500瓦電源供應器，前級穩壓電路電源模組中使用連續電流導通模式功率因數修正電路，以提升電路操作時的功率因數，減低其電流諧波成分。後級直流-直流轉換器電路架構則為半橋式串聯諧振轉換器，配合零電壓切換減少一次側切換損耗與同步整流技術減少二次側導通損。兩組同步降壓型轉換器提供12 V電壓降壓為5 V與3.3 V。並設計一返馳式轉換器電路架構，提供待機與輔助電源。
輸出規格如下：12 V/26 A、5 V/20 A、3.3 V/20 A、-12 V/1 A與一組待機電源5 V/2 A。雛型電路的實驗測量結果，驗證了本論文所研究的電源架構與控制方法的可行性，且符合能源之星要求的規範。

This thesis developed a 500 watt power supply for personal computer applications. A continuous conduction mode power factor corrector is used as the pre-regulator for improving the input power factor and reducing the total harmonic distortion of the input current. A half-bridge series resonant converter with synchronous rectification is adopted as the DC-DC conversion stage. Switching losses on the primary switches and conduction losses on the secondary rectifier can be significantly reduced. Two synchronous buck converters are implemented to step down the 12 V bus voltage to 5 V and 3.3 V output voltages, respectively. A flyback converter is adopted to provide the auxiliary and standby power supply.
The output specifications of the developed power supply are: 12 V/26 A, 5 V/20 A, 3.3 V /20 A, -12 V/1 A with an additional 5 V/2 A standby power supply. Experimental results of a prototype circuit are shown to verify the feasibility of the studied power supply system. Both the conversion efficiency and power factor meet the requirements of Energy Star specifications.

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