本論文主要目的係將雙模式控制法運用在降壓型主動功率因數修正器，當輕載時電路會操作在邊界導通模式，降低輕載操作的切換損失。當重載時操作於連續導通模式，電感電流峰值電流較低，電路功率元件之導通損耗較小。
本論文先就兩導通模式之功率因數修正器做分析，量測出各個負載下之效率分佈，因此可找出雙模式降壓型功率因數修正器的轉態點。最後實際製作一 150 W 雙模式降壓型功率因數修正器，以實驗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 使用意法半導體所生產的 L6561，搭配自製外加控制電路，功率級採用降壓型轉換器電路架構。經測量結果證明，輕載及半載下確實操作於邊界導通模式而減少切換損耗；而重載下操作於連續導通模式而減少導通損耗。

This thesis aims to study a dual-mode buck active power factor corrector (PFC). Under light-load condition, the circuit is operated at boundary conduction mode (BCM) to reduce the switching loss. Otherwise, the circuit is operated at continuous conduction mode (CCM) under heavy-load condition. The peak inductor current is reduced and the conduction loss is less.
First, the loss distributions of the PFC at various load levels for both BCM and CCM are analyzed. Therefore, a transition point can be found to switch between the two control modes. A 150-W dual-mode buck PFC prototype is built to verify the circuit analysis and design considerations. The control circuits of the laboratory prototype are implemented by using the STMicroelectronics chip L6561 and additional external circuits. Experimental results show that the studied PFC actually operates under BCM from light-load to half-load conditions to reduce the switching loss, and under CCM at heavy loads to reduce the conduction loss.

[1]Limits for Harmonic Current Emissions (Equipment Input Current < 16A Per Phase), IEC/EN 61000-3-2, 1995.
[2]B. Wilkenson, “Power Factor Correction and IEC 555-2,” Power Techniques Magazine, pp. 20-24, 1991.
[3]Mohan. U. R/原著，江炫樟/編輯，電力電子學，第三版，全華圖書股份有限公司，2008年。
[4]N. Mohan, T. M. Undeland, and W. P. Robbins, Power Electronics: Converters, Applications, and Design, Third Edition, John Wiley & Sons, Inc., 2003.
[5]S. S. Kim and P. N. Enjeti, “A modular single-phase power factor correction scheme with a harmonic filtering function,” IEEE Transactions on Industrial Electronics, vol. 50, no. 2, pp. 328-335, April 2003.
[6]許元豪，「徹底剖析工作於連續導通模式下升壓型PFC 線路中高壓快速恢復二極管所導致的五種功率損耗模式」，電子月刊，2008年2月。
[7]J. Luo, “New PFC solution for the future ICE1PCS01/02,” Infineon Power Seminar, 16th Sept. 2004, Singapore.
[8]張厚升，「功率因數(PFC)校正技術的新型控制技術的優缺點對比」，電源世界，2007年9月。
[9]洪瑞鴻，「2kW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94年。
[10]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.
[11]張家榮 ，「不需輸入電壓感測之主動型功因修正 AC/DC 轉換器的研製」，國立中山大學電機工程系研究所碩士論文，民國95年。
[12]C. A. Canesin and I. Barbi, “Analysis and design of constant-frequency peak-current-controlled high-power-factor boost rectifier with slope compensation,” in Proc. IEEE APEC '96, vol. 2, pp. 807-813, March 1996.
[13]Texas Instruments Incorporated, “UC3854 high power factor preregulator,” Datasheet, 1999.
[14]M. F. Schlecht and B. A. Miwa, “Active power factor correction for switching power supplies,” IEEE Transactions on Power Electronics, vol. 1, no. 4, Oct. 1987.
[15]ST Microelectronics, “L6561, enhanced transition mode power factor corrector,” Application Note AN966, 2003.
[16]ST Microelectronics, “EVAL6562-375W evaluation board L6562-based 375W FOT-controlled PFC pre-regulator,” Application Note AN1895, 2004.
[17]ST Microelectronics, “Solution for designing a 400 W fixed off-time controlled PFC pre-regulator with the L6562A,” Application Note AN2782, 2010.
[18]ST Microelectronics, “Design of fixed-off-time-controllered PFC pre-regulators with the L6562,” Application Note AN1792, 2003.
[19]R. B. Ridley, “A new continuous-time model for current-mode control with constant frequency, constant on-time and constant off-time, in CCM and DCM,” IEEE Power Electronics Specialists Conference Record, San Antonio, Texas, pp. 382-389, 1990.
[20]C. Adragna, S. De Simone, and G. Gattavari, “New fixed off-time PWM modulator provides constant frequency operation in boost PFC pre-regulators,” in Proc. IEEE SPEEDAM, pp. 656-661, 2008.
[21]ST Microelectronics, “400 W FOT-controlled PFC pre-regulator with the L6563S,” Application Note AN2994. 2010.
[22]Texas Instruments Inc., “UCC29910 buck PFC controller,” Datasheet, June 2010.
[23]ST Microelectronics, “L6561, power factor corrector,” Datasheet, 2003.
[24]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99年。
[25]謝沐田，高低頻變壓器設計，全華科技圖書股份有限公司，2005年11月。
[26]TDK Ferrite Cores for Power Supply and EMI/RFI Filter, 2007.
[27]ON Semiconductor, “Power factor correction stages operating in critical conduction mode,” Application Note AND8123/D, 2003.
[28]X. Wu, J. Yang, J. Zhang, and M. Xu, “Design considerations of soft-switched buck PFC converter with constant on-time (COT) control,” IEEE Transactions on Power Electronics, vol. 26, no. 11, pp. 3144-3151, Nov. 2011.
[29]Texas Instruments Inc., “Power factor correction using the buck topology-efficiency benefits and practical design considerations,” Application Note SLUP264, June 2010.
[30]張家鏵，「GaN FET應用於高頻化錯相式降壓型功率因數修正器之研製」，國立台灣科技大學電子工程系研究所碩士論文，民國102年。
[31]R. W. Erickson, D. Maksimovic, Fundamentals of Power Electronics, 2nd Edition, 2000.
[32]C. P. Basso, “Switch-mode power supplies, SPICE simulations and practial designs, ” 1st Edition, 2008.
[33]SHINDENGEN, “Super fast recovery rectifiers,” Shindengen Electric Mfg. Co. Ltd., 2000.
[34]SHINDENGEN, “Low forward voltage low noise type single In-line package,” Shindengen Electric Mfg. Co. Ltd., 2010.
[35]陳彥捷，「雙模式控制返馳式轉換器最佳化設計」，國立台灣科技大學電子工程系研究所碩士論文，民國100年。