本論文主要目標在於研究具有高功率因數、高效率及低電流諧波失真之半無橋功率因數修正器，且改善元件高耐壓、高耐流、儲能電感體積過大、輸出電容過大之問題。最後，採用固定切換頻率之平均電流模式控制，以降低輸入電流諧波，並使輸入電壓與電流同相位，達到功率因數修正之目的。在實作電路上，利用DSP控制，研製一台650W功率因數修正器。實驗結果驗證所採用控制方法的正確性與可行性，同時在未來展望說明後續研究之方向與建議。

This thesis is focused on the design and implementation of a semi-bridgeless power factor corrector (PFC) to achieve high power factor, high efficiency and low input current harmonics. In addition, the voltage and current ratings of the power switches, and the volumes of inductors and output capacitors can be reduced. Finally, the average current mode control with a constant switching frequency is adopted. The main objective is to reduce the input current harmonics and to achieve a unity power factor. A 650-W PFC prototype is implemented based on the DSP control IC. Satisfactory experimental results confirm the validity and feasibility of the adopted schemes. Potential future works are mentioned for further improvement.

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