本論文主要研製一台交錯式降壓型功率因數修正器，分別研製300 W單相降壓型功率因數修正器及雙相交錯式降壓型功率因數修正器，進行實做比較。採用箝位電流的控制方式，使電路在一線週期內得以操作於不連續導通以及連續導通兩種模式。
　　箝位電流模式控制，具有響應快速等特點，做為交錯式架構的控制電路不僅簡單，輸出電流漣波小，輸入電流諧波也較低。雙相並聯的功率元件規格可以縮小，功率密度與輸出功率也可大為提高。搭配箝位電流的控制，讓電路在重載時操作於不連續電導通模式與連續導通模式，減小峰值電流以及降低電路導通損耗並改善轉換效率特性。不同於一般升壓架構，降壓型功率因數修正器的輸出可以選用耐壓較低的電解電容，在後級直/直流轉換器設計上也具有更多選擇性。本論文詳細分析及討論單相及交錯式降壓型功率因數修正器，並描述電路的操作原理與設計考量，最終以實驗結果驗證兩個架構的優缺點。

　　The purpose of this thesis is to study and implement an interleaved buck converter with power factor correction function. Two 300 W PFC prototypes, single-phase power factor corrector (PFC) and two-phase interleaved boost power factor corrector, are implemented and compared. A clamp-current mode control method is adopted and operates the converter in continuous current conduction mode (CCM) and discontinuous current conduction mode (DCM).
　　The clamp current mode control provides a faster response, a simple control technique in interleaved topology, lower output ripple current, and lower input current harmonic distortion. In addition, the peak current can be reduced and the size of power components can be smaller. Therefore, the power density can be higher. Under heavy load, the presented converter can be operated in DCM and CCM with the clamp current mode control mathod. This helps reduce conduction losses and improve conversion efficiency. Compared with conventional boost PFC converters, the buck PFC converter can use a lower voltage output electrolyte capacitors those provides more choices in the post-stage DC/DC converter design. The operation principles and design produce for the single-phase buck power factor corrector and the studied interleaved buck power factor corrector are analyzed and discussed in this thesis. Experimental results verify the advantages and disadvantages of the proposed converter.

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