本論文主要研製一台主僕式降壓型功率因數修正器，採用IC L6561做控制電路，搭配固定截止時間機制，使電路操作於連續導通模式。
L6561為峰值電流模式控制，具有響應快速等特點，做為主僕式架構的控制電路不僅簡單，輸出電壓漣波小，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。搭配固定截止時間機制，讓電路在重載時操作於連續導通模式，降低電路導通損耗並改善電路電氣特性。不同於一般升壓架構，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。本論文詳細分析及討論主僕式降壓型功率因數修正器的操作原理與設計考量，實驗結果證明了此電路的可行性。

The purpose of this thesis is to study and implement a master-slave buck converter with power factor correction function. The proposed converter is controlled by an IC L6561, which helps simplify the circuit and make the converter to be operated in continuous conduction mode with a fixed off-time mechanism.
L6561 is used for peak current mode control, which provides a faster response, a simple control technique in master-slave topology, lower output ripple voltage, and lower input current harmonic distortion. In addition, the dimensions of power components can be smaller; therefore, the power density can be higher. Under heavier loads, the presented converter can be operated in CCM with the fixed turn-off time. This helps reduce conduction losses and improve the performance of the converter. 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. The operation principle and design steps of a master-slave buck converter are analyzed and discussed in this thesis. Experimental results verify the feasibility of the proposed converter.

R. W. Erickson, D. Maksimovic, Fundamentals of Power Electronics,Second Edition, Kluwer academic Publishers, 2001.
[2] A. I. Pressman, “Switching Power Supply Design,” McGraw-Hill, Inc., 1998.
[3] Mohan. U. R./原著. 江炫樟/編譯. “Power Electronics 電力電子學”, 第三版. 全圖書股份有限公司. 2008.
[4] Raymond. A. M. J./原著. 林伯仁、羅有綱、陳俊吉/編譯.” 交換式電源供應器剖析”, 全華. 2008.
[5] 梁適安/編著. “交換式電源供應器之理論與實務設計”, 全華圖書股份有限公司. 修訂版. 2009.
[6] 林建宇，「雙模式升壓型功率因數修正器最佳化設計」，國立台灣科技大學電子工程系研究所碩士論文，民國98年。
[7] 王釗桴，「單級雙變壓器主動箝位返馳式轉換器研製」，國立台灣科技大學電子工程系研究所碩士論文，民國98年。
[8] 劉宇晨，「700W雙組輸出備援式直流/直流轉換器研製」，國立台灣科技大學電子工程系研究所碩士論文，民國96年。
[9] 顏至良，「主僕式準諧振返馳式轉換器研製」，國立台灣科技大學電子工程系研究所碩士論文，民國95年。
[10] 蔡智偉，「1-Kw 交錯式升壓型功率因數修正器研製」，國立台灣科技大學電子工程系研究所碩士論文，民國96年。
[11] 陳冠廷，「具功率因數修正器關閉功能之雙模式返馳式轉換器研製」，國立台灣科技大學電子工程系研究所碩士論文，民國98年。
[12] L. Huber, L. Gang and M. M. Jovanovic, “Design-oriented analysis and performance evaluation of buck PFC front end, ” IEEE Transactions on Industrial Electronics, vol. 25, no. 1, pp. 85-94, May 2010
[13] ST Microelectronics, “L6561, POWER FACTOR CORRECTOR,” Data Sheet, 2003.
[14] Texas Instruments Inc,“UCC29910 Buck PFC Controller”Data Sheet, June. 2010.
[15] T Microelectronics, “DESIGN OF FIXED - OFF - TIME - CONTROLLED PFC PRE-REGULATORS WITH THE L6562,” Application Note AN1792.
[16] ST Microelectronics, “Solution for designing a 400 W fixed off-time controlled PFC pre-regulator with the L6562A,”Application Note AN2782
[17] T Microelectronics, “EVAL6562-375W Evaluation Board L6562-based375W FOT-controlled PFC Pre-regulator,” Application Note AN1895.
[18] TDK Ferrite Cores for Power Supply and EMI/RFI Filter, 2007.
[19] Chen Bing, Xie Yun-Xiang, Huang Feng and Chen Jiang-Hui.”A Novel Single-phase Buck PFC Converter Based on One-cycle Control”, South China University of Technology, Guangzhou,China.