本論文旨在研製一組單級電能轉換器，以電壓隨耦控制法的升壓型功因修正單元串聯雙變壓器主動箝位順向式轉換器而成。採用不連續導通模式的功因修正單元不只可降低升壓電感所需的體積，同時也不需要電流迴路控制電路，如此可降低電路的複雜度。而作為直流-直流轉換單元的主動箝位順向式轉換器，本文提出一雙變壓器的架構，除了保有零電壓切換與寬輸入電壓調節特性外，還可均分輸出功率以分散功率變壓器體積和降低次級側元件的應力，有利於高功率密度的設計。
本文分析單級雙變壓器主動箝位順向式轉換器之動作原理，配合Mathcad數學軟體的輔助設計，實際完成一組輸入電115 Vac、輸出為19 V/140 W、滿載效率85%、滿載功率因數為0.99的單級電能轉換器。

This thesis presents a single-stage AC-to-DC power converter, which consists of a boost-type power factor corrector (PFC) and a two-transformer active-clamp forward converter. The PFC stage adopts the voltage-follower control under discontinuous conduction mode. It helps reduce the volume of the boost inductor. The current control loop is not required to reduce the circuit design complexity. By utilizing separate transformers, the proposed converter features zero-voltage switching and good line regulation over a wide range of the input voltage. The output power can be shared by two transformers to reduce their volumes and the stresses of components at secondary side. This allows high power density design.
The operating principle of this single-stage power converter has been analyzed, described and discussed in detail. The simulaton softwares, Mathcade and PSIM, are applied for circuit design. The experimental results with an input voltage of 115 Vac and an output of 19 V/140 W reveal a maximum efficiency of 85% and a maximum power factor of 0.99.

[1] A. I. Pressman, Switching Power Supply Design, Third Edition, McGraw-Hill, Inc., 2009.
[2] M. Brown, Power Supply Cookbook, Second Edition, Butterworth-Heinemann, 2001.
[3] 原田耕介，交換式電源技術手冊，台北：建興文化事業有限公司，2006年4月。
[4] 宋自恆、林慶仁，「功率因數修正器之原理與常用規格」，新電子科技雜誌，第217期，頁數：44-57，民國93年4月。
[5] 梁適安，交換式電源供給器之理論與實務設計，第二版，台北：全華圖書，2008年。
[6] F. C. Schwartz, “A Method of Resonant Current Pulse Modulationin Power Converters,” IEEE Transactions on Power Electronics, vol. 17, no. 3, pp. 209-221, May 1970.
[7] K. H. Liu and F. C. Lee, “Zero-Voltage-Switched Quasi Resonant Conveters,” U. S. Patent, no. 4,720,668, Jan. 1988.
[8] K. H. Liu and F. C. Lee, “Zero-Current-Switched Quasi Resonant Conveters Operating in Full-Wave Mode,” U. S. Patent, no. 4,720,667, Jan. 1988.
[9] J. Wittenbreder, “Zero Voltage Switching Pulse Width Modulated Power Converter,” U. S. Platent, no. 5,402,329, Mar.1995.
[10] 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。
[11] 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。
[12] B. R. Lin, H. K. Chiang, C. E. Huang, and K. C. Chen,
“Analysis of an Active Clamp Forward Converter,” in Proc. IEEE PEDS 2005, pp. 140-145.
[13] B. R. Lin, H. K. Chiang, C. E. Huang, and K. C. Chen, “Analysis, Design and Implementation of an Active-Clamp Flyback Converter,” in Proc. IEEE PEDS, 2005, pp. 424-429.
[14] J. Feng, Y. Hu, W. Chen, and C. C. Wen, “ZVS Analysis of Asymmetrical Half-Bridge Converter,” in Proc. IEEE PESC, 2001, pp. 243-247.
[15] 吳義利，切換式電源轉換器，第一版，台北：文笙書局，2012年。
[16] IEC61000-3-2, “Electromagnetic Compatibility (EMC), Part 3: Limits Section 2: Limits for Harmonic Current Emissions,” 1995.
[17] N. Mohan, T. M. Undeland, and W. P. Robbins, Power Electronics: Converters, Application, and Design, Third Edition, John Wiley & Sons, Inc., 2003.
[18] 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，第240期，頁數：41-51，民國95年3月。
[19] 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。
[20] M. Madigan, R. Erickson, and E. Ismail, “Integrated High Quality Rectifiers-Regulators,” in Proc. IEEE PESC, 1992, pp. 749-758.
[21] 王釗桴，單級雙變壓器主動箝位返馳式轉換器研製，國立臺灣科技大學研究所碩士論文，民國99年。
[22] T. J. Chung, G. W. Moon, and M. J. Youn, “Analysis and Design of a Single-Stage Single-Switch Bi-Flyback AC/DC Converter,” International Journal of Electronics, vol. 91, no. 1, pp. 25-40, Jan. 2004.
[23] A. J. Calleja, J. M. Alonso, E. L’opez, J. Ribas, J. A. Mart’mez, and M. R. Secades, “Analysis and Experimental Results of a Single-Stage High-Power-Factor Electronic Ballast Based on Flyback Converter,” IEEE Transactions on Power Electronics, vol. 14, no. 6, pp.1142-1148, Nov. 1999.
[24] Y. S. Lee and B. T. 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, pp. 1017-1027, Nov. 1997.
[25] H. Endo, K. Harada, Y. Ishihara, and T. Todaka, “A Novel Single-Stage Active Clamped PFC Converter,” in Proc. IEEE INTELEC, 2003, pp. 124-131.
[26] 林景源，變壓器主動箝位順向式與返馳式轉換器，國立臺灣科技大學研究所博士論文，民國96年。
[27] B. R. Lin, H. K. Chiang, C. C. Chen, and C. C. Chen, ”Zero Voltage Switching Active Clamp Converter with Series-Connected Transformer,” in Proc. IEEE CCS, 2006, pp. 2727-2731.
[28] 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 Transactions on Power Electronics, vol. 19, no. 2, pp. 411-419, Mar. 2004.
[29] B. R. Lin, H. K. Chiang, and C. C. Chen, “Analysis of a Zero-Voltage Switching Converter with Two Transformers,” IEEE Transactions on Circuits and Systems II: Express Briefs, vol. 53, no. 10, pp. 1088-1092, Oct. 2006.
[30] 董育豪，儀器用低穩壓率輔助電源設計，國立臺灣科技大學研究所碩士論文，民國101年。
[31] J. S. Lai and D. Chen, “Design Consideration for Power
Factor Correction Boost Converter Operating at the Boundary of Continuous Conduction Mode and Discontinuous Conduction Mode,” in Proc. IEEE APEC, 1993, pp. 267-273.
[32] M. F. Schlecht and B. A. Miwa, “Active Power Factor Correction for Switching Power Supplies,” IEEE Transactions on Power Electronics, vol. 2, no. 4, pp. 273-281, Oct. 1987.
[33] 蕭家斌，雙變壓器主動箝位返馳式轉換器之研製，國立臺灣科技大學研究所碩士論文，民國100年。
[34] K. H. Liu and Y. L. Lin, “Current Waveform Distortion in Power Factor Correction Circuits Employing Discontinuous-Mode Boost Converters,” in Proc. IEEE PESC, 1989, pp. 825-829.
[35] 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 Electronics, vol. 11, no. 1, pp. 162-169, June 1996.
[36] P. Kongthawornwattana, C. Bunlaksananusorn, and S. Kittiratsatcha,“Design of a Single-Stage Single-Switch Power-Factor-Corrected (S4-PFC) AC/DC Converter,” in Proc. IEEE PEDS, 2007, pp. 772-777.
[37] Application Handbook, Magnetic Power Cores, Chang Sing Corparation, 2011.
[38] Application Handbook, A-Core Mn-zn Power Ferrite Material Product Catalog, A-core, 2008.