本論文主要研製一台符合能源之星之高效能電源供應器，其輸出規格為240W/12V。邊界導通模式SEPIC功率因數修正器用來做前級穩壓器，實現高功率因數與高效率。後級為同步整流之半橋式串聯諧振轉換器，其與生俱來的零電壓切換特性減少變壓器一次側切換損耗，同步整流技術減少二次側導通損，此電路實現高轉換效率與良好的溫度散佈。
採用SEPIC架構之功率因數修正電路優點為可利用其升降壓特性，使前級輸出電壓為200V，對於後級能大幅降低元件電壓應力及減低EMI濾波器大小，並易於實現電源供應器高功率密度之要求。藉由設定諧振頻率及特性阻抗，利用Mathcad數學軟體可計算出各元件之値，並利用Simplis模擬軟體進行電路模擬，驗證及確認其設計之可行性後。最後實作一台輸出規格為12V/20A之高效能電源供應器，除了將實測結果和理論值相互印證之外，並研擬未來研究方向。

This thesis presents a continuous current conduction mode (CCM) single-ended primary inductance converter (SEPIC) power factor corrector (PFC) adopting a transition-mode (TM) PFC controller and coupled inductors. The input current waveform remains continuous to reduce the size of the EMI filter and increase power density. Due to the inherent voltage step-up/down features of the SEPIC PFC, the input voltage of the post-stage half-bridge series resonant converter (HB-SRC) can be decreased to reduce the voltage stresses on the power switches. High efficiency and low cost can be achieved. Circuit topologies and design considerations for the studied high performance power supply are analyzed and discussed in detail. High efficiency requirements for the Energy Star standards can be satisfied.

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