本論文主要目的係研製一具有高功率因數、低諧波、高效率及高功率密度之雙相交錯式無橋降壓型功率因數修正器。雙相交錯式控制策略不只保有傳統單相脈波寬度調變(PWM)降壓型轉換器的優點，且在高輸出功率下更可改善功率元件高耐流、儲能電感體積過大、輸出電容過大及EMI濾波器體積等問題。本論文實際製作一700W之無橋降壓型功率因數修正器與一700W之雙相交錯式無橋降壓型功率因數修正器，以驗證論文中所提之分析與設計考量是否合理。實作電路之控制IC使用德州儀器公司所生產的UC3842，採用具箝位功能之電流控制模式，不同於一般升壓型架構，降壓型功率因數修正器的輸出電解電容可以選用較低值，在後級DC-DC轉換器設計上也具有更多選擇性。經測量結果證明，雙相交錯式架構確實可以減少電流漣波，適合於大功率應用場合。

This thesis is focused on the design and implementation of a two-phase interleaved bridgeless buck power factor corrector (PFC) to achieve a high power factor, low input current harmonics, high efficiency and high power density. A two-phase interleaved bridgeless buck PFC features the advantages of a conventional single-phase PWM buck converter. In addition, the voltage and current ratings of the power switches, and the volumes of the inductors, output capacitors and EMI filters can be reduced. A 700-W bridgeless buck PFC and a 700-W two-phase interleaved bridgeless buck PFC are implemented in the laboratory. Experiments are conducted and satisfactory results are measured to confirm the effectiveness and the feasibility of the theoretical analysis and design considerations. The UC3842 is used as the control IC with a clamp-current feature for the PFC. Compared with other general boost converters, a buck converter requires smaller electrolyte capacitors at the output. It contributes to have more choices in the DC-DC converter design. Thus the two-phase interleaved PFC is especially suitable for serving as a pre-regulator in the high-power applications.

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