本論文提出可以平均分擔負載電流的交流/直流轉換器，此乃考量適合應用於大電流負載且擁有較佳擴充模組彈性需求的伺服器電腦系統。此電源供應器結構包含前端的電磁干擾濾波器，可有效消除電源供應器系統端雜訊所造成之干擾問題。前級使用主動零電壓功率因數修正器，後級使用全橋相移零電壓切換轉換器，皆運用零電壓切換技術以有效降低切換損失，進而提升全機效率。控制電路包含保護電路及自動主僕式均流控制電路。文中並針對主動零電壓功率因數修正器、全橋相移零電壓轉換器及並聯均流技術的電路架構作原理說明。
最後設計實作出二部1 kW並聯均流伺服器電源供應器，其輸出電壓為24 V，輸出電流為40 A，效率約為82 %以上(在110 V交流輸入)，分流率為3 %以內。

This thesis proposes an AC/DC converter with a load-current sharing feature. The studied converter is suitable for server power supplies demanding high output currents and flexible modulization. An EMI filter for suppressing the conducted noise resulting from the developed power supply is included at the front end, which is followed by a zero-voltage-switching (ZVS) active power factor corrector (PFC) and a ZVS phase-shift full-bridge DC/DC converter. The ZVS technique successfully reduces the switching losses and thus increases the overall efficiency. The main control system consists of several protection circuits and an automatic master-slave current-sharing controller. The operating principles for the ZVS PFC, the phase-shift full-bridge converter, and the master-slave current-sharing control are discussed.
Two 1-kW prototype circuits of server power supplies are implemented and parallel operation is tested. The output voltage is 24 V, the output current is 40 A, and the overall efficiency is about 82% at 110V AC mains voltage. The error percentage of the current-sharing is less than 3 % of the rated output current.

[1] J. Dukdrik, P. Spanik, and N. D. Trip, “Zero-Voltage and Zero-Current Switching Full-Bridge DC-DC Converter With Auxiliary Transformer”, IEEE Transactions on Power Electronics, Vol. 21, NO. 5, pp.1328-1335, Sep., 2006.
[2] J. G. Cho, J. A. Sabate, and F. C. Lee, “Novel Full Bridge Zero-Voltage-Transition PWM DC/DC Converter for High Power Applications”, IEEE APEC, pp. 143-149, 1994.
[3] C. A. Canesin and I.Barbi, ”Novel Zero-Current-Switching PWM Converters”, IEEE Transactions on Industrial Electronics, vol. 44, number3, pp. 372-381, June 1997.
[4] F. T. Wakabayashi and C. A. Canesin, “A New Family of Zero-Current-Switching PWM Converters and A Novel HPF-ZCS-PWM Boost Rectifier”, IEEE APEC, vol. 1, pp. 605-611, March 1999.
[5] Richard Lee Ozenbaugh, EMI Filter Design, Marcel Dekker, Inc. 1996.
[6] 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。
[7] Chen Zhou, Active Boost Power Factor Analysis and Design, IBM Corporation, April 20, 1989.
[8] 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.
[9] K. H. Billings, C. Eng, and M. I. E. E. , Switchmode Power Supply Handbook, The McGraw-Hill Companies, Inc. 1999.
[10] 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。
[11] J. H. Kim, D. Y. Lee, H. S. Choi, and B.H. Cho, “High Performance Boost PFP(Power Factor Pre-regulator) with an Improved ZVT(Zero Voltage Transition) Converter”, Applied Power Electronics Conference and Exposition, 2001. APEC 2001. Sixteenth Annual IEEE, Vol. 1, pp. 337 – 342, March 2001.
[12] G. Hua, C. S. Leu, Y. Jiang, and F. C. Lee, “Novel Zero-Voltage-Transition PWM Converters”, IEEE Transactions on Power Electronics, Vol.9, No.2, March 1994.
[13] Canesin, C.A., and Barbi I., “Analysis and Design of Constant-Frequency Peak-Current-Controlled High-Power-Factor Boost Rectifier with Slope Compensation” , 1996. APEC '96., Vol. 2, pp. 807-813, March 1996.
[14] 林景源，「適用於大範圍負載變化之電源供應器研製」，國立台灣科技大學電子工程系研究所碩士論文，民國93年。
[15] Application Handbook, SLUS157B, UCC3895 BiCMOS Advanced Phase Shift PWM Controller, Unitrode Inc., January 2001.
[16] R. Redl, L. Balogh, and D. W. Edwards, “Optimum ZVS Full-Bridge DC/DC Converter with PWM Phase-Shift Control: Analysis, Design Considerations, and Experimental Results”, in Proc. IEEE APEC’94, pp. 159-165, 1994.
[17] G. C. Hsieh, J. C. Li, and M. H. Liaw, “A Study on Full-Bridge Zero-Voltage-Switched PWM Converter: Design and Experime- ntation”, in Proc. IEEE IECON’93, pp. 1281-1285, 1993.
[18] H. J. Chiu, L. W. Lin, C. H. Lin and H. M. Huang, “PAS Power
Supply Harmonic Elimination By Active Conditioner”, IEEE Trans. on A erospace and Electronic Systems, Vol. 42, pp.341-350, Jan. 2006.
[19] N.H. Kutkut, “A Full Bridge Soft Switched Telecom Power Supply with a Current Doubler Rectifier”, Digital Object Identifier 10, pp. 344-351, Oct. 1997.
[20] B. T. Irving and M. M. Jovanovic, “Analysis Design and Performance Evaluation of Droop Current-Sharing Method”, Proc. of IEEE APEC’00, pp. 235-241,2000.
[21] S. Luo, Z. Ye, R. Lin and F. C. Lee, “A Classification and Evaluation of Parallel Methods for Power Supply Modules”, CPES Seminar’98, pp. 221-231, 1998.
[22] C. Jamerson, C. Mullett, “Seven Ways to Parallel a Magamp”, Proc. of IEEE APEC’93, pp.469-474, 1993.
[23] C. S. Lin and C. L. Chen, “Single-Wire Current-Share Paralleling of Current-Mode-Controlled DC Power Supplies”, IEEE Trans. On Industrial Electronics, pp.780-786, 2000.
[24] L. Balogh, “Paralleling Power-Choosing and Applying the Best Technique”, Unitrode-Seminar, 2003.
[25] 侯文傑，「並聯直流電源供應器自動主僕均流技術之研究」，國立成功大學電機工程系研究所碩士論文，民國93年。
[26] Colonel WM. T. Mclyman, Transformer and Inductor Design Handbook, Marcel Dekker, Inc. 2004.
[27] P. C. TODD, “UC3854 Controlled Power Factor Correction Circuit Design ”, Application Note U-134.
[28] Texas Instruments Incorporated, “UCC3895 BiCMOS Advanced Phase Shift PWM Controller,” Data Sheet, 2005.