電源轉換器普遍採用功率因數修正單元與直流-直流電壓轉換單元兩級串接的方式，如此能達到高功因的要求，但在效率規範、電路設計複雜度與元件數需求上便相對提升不少。
本論文旨在研製一組單級電能轉換器，以文中提出的雙變壓器主動箝位返馳式轉換器作為直流-直流電壓轉換單元，除了保有零電壓切換與寬輸入電壓調節特性，雙變壓器架構可均分輸出功率以分散變壓器體積，有利於高功率密度設計；此外，並加入一組以電壓隨耦法控制的不連續電流操作模式升壓型功因修正單元，如此可降低升壓電感體積，且不需電流控制迴路。
本文對單級雙變壓器主動箝位返馳式轉換器之動作原理作分析與討論，配合SIMetrix軟體之模擬，實際完成一組輸入電壓範圍為105Vac~115Vac，輸出為19V/100W，滿載效率86%，滿載功率因數為0.99的單級電能轉換器。

Generally, an AC-to-DC power converter is composed of a power factor corrector pre-regulator and a DC-to-DC post-regulator to achieve high input power factor and conversion efficiency. However, it increases the circuit design complexity and component number. This thesis presents a single-stage AC-to-DC power converter consisting mainly a two-transformer active-clamp flyback converter. Not only the zero-voltage-switching feature and good line regulation over a wide range of input voltage are maintained, but also the output power can be shared by two transformers to reduce the circuit volume. By utilizing two separate transformers, the proposed converter allows high power density design. In addition, a discontinuous conduction mode boost-type power factor corrector based on the voltage-follower control is included. It helps reduce the volume of the boost inductor and a current control loop is no longer required. The operation principle of this single-stage AC-to-DC power converter has be described, analyzed and discussed in detail. The computer simulation software, SIMetrix, is applied for circuit analysis. Experiment results have been verified with the theoretical analysis over an input voltage range of 105 Vac to 115 Vac and an output of 19 V/100 W, at a maximum efficiency of 86% and a maximum power factor of 0.99.

[1] A. I. Pressman, “Switching Power Supply Design” Third Edition, McGraw-Hill, 2009.
[2] Marty Brown, “Power Supply Cookbook” Second Edition, Butterworth-Heinemann, 2001.
[3] N. Mohan, T. M. Undeland and W. P. Robbins, “Power Electronics Converters, Applications, and Design,“ John Wiley & Sons Inc., 3rd Edition, 2003.
[4] S. S. Ang, “Power-Switching Converters,” Second Edition, Marcel Dekker, Inc. 2005.
[5] 宋自恆、林慶仁，「功率因數修正器之原理與常用元件規格」，新電子科技雜誌217期，民國93年4月。
[6] 洪瑞鴻，「2kW功率因數修正器研製」，國立臺灣科技大學電子工程系研究所碩士論文，民國94年。
[7] F. C. Schwartz, “A Method of Resonant Currenr Pulse Modulation in Power Converters,“ IEEE Trans. on Power Electronic, Vol. IECI-17, pp209-221, May, 1970.
[8] K. H. Liu and F. C. Lee, “Zero-Voltage-Switched Quasi-Resonant Converters” U. S. Patent 4720668, Jan. 1988.
[9] K. H. Liu and F. C. Lee, “Zero-Current-Switched Quasi-Resonant Converters Operating in Full-Wave Mode” U.S. Patent 4720667, Jan. 1988.
[10] M.K.KAZIMIERCZUK, D.CZARKOWSKI “Resonant Power Converters,“ JOHN WILEY&SONS INC. ,1995.
[11] J. Wittenbreder, “Zero Voltage Switching Pulse Width Modulated Power Converter,” U. S. Platent, No. 5, Mar. 1995.
[12] 鄭振東，「新型柔性切換式電源技術入門」，全華科技圖書股份有限公司，民國92年。
[13] Bor-Ren Lin, Huann-Keng Chiang, Chien-En Huang, Kao-Cheng Chen “Analysis of an Active Clamp Forward Converter,” IEEE-PEDS Conference, Vol.1, pp.140-145, 2005.
[14] 鄭玉南，「返馳式轉換器緩振電路研究」，國立臺灣科技大學電子工程系研究所碩士論文，民國95年。
[15] 陳家麟，「具功率因數修正關閉之主動箝位返馳式轉換器研製」，國立臺灣科技大學電子工程系研究所碩士論文，民國98年。
[16] 洪賢峯，「伺服器並聯電源供應器模組之研製」，國立臺灣科技大學電子工程系研究所碩士論文，民國97年。
[17] J. Feng, Y. Hu, W. Chen, and C. C. Wen, “ZVS Analysis of Asymmetrical Half-Bridge Converter,” IEEE PESC, Vol.1, pp.243-247, 2001.
[18] IEC61000-3-2,“Electromagnetic compatibility (EMC), Part 3：Limits Section 2：Limits for harmonic current emissions,” 1995.
[19] 曾軍皓，「高效能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95年。
[20] 宋自恆、閻松駿，「主動式功率因數修正器之電感設計方式及雜訊對策徹底剖析」，新電子科技雜誌240期，3月，2006。
[21] M. Madigan, R. Erickson and E, Ismail, “Integrated High Quality Rectifiers-Regulators” IEEE PESC, 1992, pp336-341.
[22] 蘇英傑，「具同步整流倍流輸出之單級非對稱半橋電能轉換器」，中原大學電機工程學系碩士學位論文，民國93年。
[23] T. J. Chung, G. W. Moon, M. J. Youn, Department of Electrical Engineering, “Analysis and design of a single-stage single-switch bi-flyback ac/dc converter,“ Korea Advanced Institute of Science and Technology, Yusong-Gu, Taejon 305-701, South Korea.
[24] Antonio J. Calleja, J. Marcos Alonso, Emilio L′opez, Javier Ribas, Juan Angel Mart′ınez, Manuel Rico-Secades, “Analysis and experimental results of a single-stage high-power-factor electronic ballast based on flyback converter “IEEE Trans. on Power Electronic, VOL. 14, NO. 6, NOV. 1999.
[25] Yim-Shu Lee, Bo-Tao Lin, “Adding active clamping and soft switching to boost-flyback single-stage isolated power factor corrected power supplies “ IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 12, NO. 6, NOVEMBER 1997.
[26] Hiroaki ENDO, Kamou HARADA, Yoshiyuki ISHIHARA and Toshiyuki TODAKA, “A Novel Single-Stage Active Clamped PFC Converter“ Faculty of Engineering, Doshisha University, 1-3, Tataramiyakodani, Kyotanabe-city, Kyoto, 610-0321, Japan.
[27] Yen-Ming Liu and Lon-Kou Chang, “Single-Stage Soft-Switching AC–DC Converter With Input-Current Shaping for Universal Line Applications“ IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 56, NO. 2, FEBRUARY 2009.
[28] T. F. Wu, L A . Liang and C.-H. Lee, “A Family of Isolated Single-Stage ZVS-PWM Active-Clamping Converters“ (PEARL) Department of Electronics Engineering, National Chung Cheng University.
[29] Yeong-Chang Yan, Shih-Jen Cheng, Ching-Chun Chuang, Huang-Jen Chiu and Yu-Kang Lo, “A Single-stage Soft-Switching Flyback Converter for Power Factor Correction Applications “ Dept. of Electronic Engineering, National Taiwan University of Science and Technology.
[30] Byoung-Hee Lee, Chong-Eun Kim, Ki-Bum Park and Gun-Woo Moon, “A New Single-Stage PFC AC-DC Converter with Voltage-Doubler Rectified Asymmetrical half-bridge converter “, (KAIST) , Department of Electrical Engineering, Korea.
[31] H. K. Yoon, S. K. Han, J. S. Park, G. W. Moon, and M. J. Youn, “Zero-voltage switching two-transformer full-bridge PWM converter with lossless diode-clamp rectifier for PDP sustain power module” IEEE Trans. Power Electron., vol. 21, no. 5, pp.1243-1252, Sept. 2006.
[32] H. K. Yoon, E. S. Choi, S. K. Han, G. W. Moon, and M. J. Youn, “Zero-voltage and zero-current switching two transformer full-bridge converter using the output voltage doubler” in Proc. IEEE-IPEMC, 2006, pp. 1-5.
[33] G. B. Koo, G. W. Moon, and M. J. Youn, “Analysis and design of phase shift full bridge converter with series-connected two transformers ” IEEE Trans. Power Electron., vol. 19, no. 2, pp. 411-419, March. 2004.
[34] Y. H. Leu and C. L. Chen, “Analysis and design of the two-transformer asymmetrical half-bridge converter” in Proc. IEEE-PESC, pp. 943-948, 2002.
[35] T. Jin. W. Zhang, A. Azzolini, and K. M. Smedley, “A new interleaved forward converter with inherent demagnetizing feature” in Proc. 40th IEEE Ind. Appl. Conf., 2005, pp. 625-630 .
[36] B. R .Lin, H. K, Chiang, and C. C. Chen, “Analysis of a zero-voltage switching converter with two transformers” IEEE Trans. Circuits Syst. I., vol. 53, no. 10, pp. 1088-1092, Oct. 2006.
[37] 林景源，「雙變壓器主動箝位順向式與返馳式轉換器」，國立臺灣科技大學電子工程系研究所博士論文，民國96年。
[38] B. P. Divakar, and D. Suanto, “A New Boost Power Factor Pre-Regulator ” IEEE Proc. PEDS’99, vol. 2, pp. 915-920, 1999.
[39] J. S. Lai, D. Chen, “Design Consideration for Power Factor Correction Boost Converter Operating at the Boundary of Continuous Conduction Mode and Discontinuous Conduction Mode “APEC93, pp297-273 , May. 1993.
[40] Chen Zhou, “Active Boost Power Factor Analysis and Design” IBM Corporation, April 20, 1989.
[41] M. F. Schlecht, and B. A. Miwa, “Active Power Factor Correction for Switching Power Supplies” IEEE Transactions on Power Electronics, Vol 1. PE-2, No. 4. October 1987.
[42] C. A. Canesin, and I. Barbi, “Analysis and Design of Constant-Frequency Peak-Current-Controlled High-Power-Factor Boost Rectifier with Slope Compensation” APEC '96., Vol. 2, pp. 807-813, March 1996.
[43] 黃健淳， 「250W局部零電壓切換準諧振升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98年。
[44] 梁適安，交換式電源供應器理論與設計實務，全華科技圖書股份有限公司，民八十三年八月。
[45] Kwang-Hwa Liu and Yung-Lin Lin, ” Current waveform distortion in power factor correction circuits employing discontinuous-mode boost converters ”, ITT PowerSystems Corp.
[46] S. Korotkov, R. Miffakhutdinov, A. Nemchinov, and S.Fraidlin, ”Asymmetrical Half-Bridge in a Single Stage PFC AC/DC Converter” APEC’97 , Vol 1, pp484-488,Feb. 1997.
[47] R. Watson, F. C. Lee, and G. C. Hua “Utilization of an active-clamp circuit to achieve soft switching in flyback converters”
IEEE Transactions on Power Electronic, vol. 11, no. 1, pp. 162-169, 1996.
[48] Bor-Ren Lin, Huann-Keng Chiang and Kao-Cheng Chen “Analysis, design and implementation of an active clamp flyback converter“, Departnent of Electrical Engineering, National Yunlin University of Science and Technology, IEEE PEDS 2005.
[49] P. Kongthawornwattana, C. Bunlaksananusorn, and S. Kittiratsatcha “Design of a Single-Stage Single-Switch Power-Factor-Corrected AC-DC converter “, Faculty Engineering, King Mongkut's Institute of Technology Ladkrabang (KMITL), Bangkok 10520, Thailan.