本文提出一具同步整流功能之疊接式半橋串聯諧振轉換器，並使用數學軟體Mathcad模擬不同品質因數Q、K因子、特性阻抗Zo與變壓器圈數比(NP/NS)對電壓增益頻率響應之影響。此電路具有低元件應力的優點，一次側功率元件的電壓應力為輸入電壓的一半，且變壓器可均分輸出電流以減少銅損及輸出同步整流開關之導通損以提高轉換效率。本文對具同步整流疊接式半橋串聯諧振轉換器做詳細的電路分析與設計考量，最後實作一台輸入電壓380 V、輸出電壓12 V、輸出電流54.4 A且具同步整流功能之疊接式半橋串聯諧振轉換器，其效率在20 %負載至滿載均高於93 % 且穩壓率小於1 %。

This thesis presents a cascoded half-bridge series resonant converter with synchronous rectification. The Mathcad software is used to simulate the influences of the quality factor (Q), K factor, characteristics impedance (Zo), and the transformer turns-ratio (NP/NS) on the frequency response of voltage gain. The proposed converter has the advantage of low device stress. It subjects the off transistor on primary side to only half of the input voltage. The transformers can share the output current to reduce the copper losses. The conduction losses on the output synchronous rectifier can also be reduced to improve the conversion efficiency. Circuit analysis and design consideration of the proposed cascoded half-bridge series resonant converter with synchronous rectification are discussed in details. The prototype converter with an input voltage 380V, output voltage 12 V and the rated output current 54.4 A was implemented and tested. The efficiency can be higher than 93 % at 20 % load to full load conditions and the voltage regulation is less than 1 %.

[1] N. J. Ku, H. J. Jung, R. Y. Kim, and D. S. Hyun, “A novel switching loss minimized PWM method for a high switching frequency three-level inverter with a SiC clamp diode,” in Proc. Energy Conversion Congress and Exposition, Sept. 2011, pp. 3702-3707.
[2] Z. L. Zhang, J. H. Fu, Y. F. Liu, and P. C. Sen, “Switching loss analysis considering parasitic loop inductance with current source drivers for buck converters,” IEEE Transactions on Power Electronics, vol. 26, no. 7, pp. 1815-1819, July 2011.
[3] J. E. Baggio, H. L. Hey, H. A. Grundling, H. Pinheiro, and J. R. Pinheiro, “Isolated interleaved-phase-shift-PWM DC-DC ZVS converter,” IEEE Transactions on Industry Applications, vol. 39, no. 6, pp. 1795-1802, Dec. 2003.
[4] J. M. Burdio, F. Canales, P. M. Barbosa, and F. C. Lee, “Comparison study of fixed-frequency control strategies for ZVS DC/DC series resonant converters,” in Proc. Power Electronics Specialists Conference, 2001, pp. 427-432.
[5] N. Mohan, T. M. Undeland, and W. P. Robbins, Power Electronics: Converters, Applications, and Design, Third Edition, John Wiley & Sons Inc., 2003.
[6] A. I. Pressman, Switching Power Supply Design, Third Edition, McGraw-Hill, 2009.
[7] R. W. Erickson and D. Maksimovic, Fundamentals of Power Electronics, Second Edition, Kluwer Academic Publishers Group, 2001.
[8] M. Delshad and H. Farzanehfard, “A new ZCS-PWM converter for high voltage high power application,” in Proc. Electrical Machines and Systems on International Conference, 2005, pp. 1161-1165.
[9] H. S. Choi and B. H. Cho, “Novel zero-current-switching (ZCS) PWM switch cell minimizing additional conduction loss,” IEEE Transactions on Industrial Electronics, vol. 49, no. 6, pp. 165-172, Feb. 2002.
[10] G. A. Karveis and S. N. Manias, “Analysis and design of a flyback zero-current switched (ZCS) quasi-resonant (QR) AC/DC converter,” in Proc. Power Electronics Specialists Conference, 1996, pp. 475-480.
[11] X. Zhang, H. S. H. Chung, X. B. Ruan, and A. Ioinovici, “A ZCS full-bridge converter without voltage overstress on the switches,” IEEE Transactions on Power Electronics, vol. 25, no. 3, pp. 686-698, March 2010.
[12] J. W. Kim and G. W. Moon, “A new LLC series resonant converter with a narrow switching frequency variation and reduced conduction losses,” IEEE Transactions on Power Electronics, vol. 29, no. 8, pp. 4278-4287, Aug. 2014.
[13] M. M. A. Rahman, “Single-phase single-stage 3-level AC-to-DC series resonant converter,” in Proc. International Conference on Electro/Information Technology, 2007, pp. 569-573.
[14] B. R. Lin, C. H. Chao, C. H. Chien, and Y. H. Wang, “Analysis of a new soft switching converter with three resonant tanks,” in Proc. Power Electronics and Drive Systems, 2013, pp. 411-416.
[15] B. R. Lin and B. R. Hou, “Implementation of a series resonant converter with series-parallel connection,” in Proc. IEEE Conference on Industrial Electronics and Applications, 2011, pp. 1179-1184.
[16] 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.
[17] C. H. Zhu, “A novel two switch forward converter with two transformers and LLC circuit,” in Proc. International Telecommunications Energy Conference, 2007, pp. 415-419.
[18] D. Y. Kim, J. K. Kim, and G. W. Moon, “A three-level converter with reduced filter size using two transformers and flying capacitors,” IEEE Transactions on Power Electronics, vol. 28, no. 1, pp. 46-53, Jan. 2013.
[19] E. S. Kim, J. H. Kim, K. H. Lee, Y. S. Jeon, J. S. Lee, and D. Y. Huh, “LLC resonant converter with two resonant tanks,” in Proc. Applied Power Electronics Conference and Exposition, 2010, pp. 1949-1956.
[20] E. S. Kim, K. H. Lee, B. G. Chung, J. H. Kim, and M. H. Kye, “A novel topology of LLC resonant inverter with two resonant tanks for Power Conditioning System,” in Proc. Applied Power Electronics Conference and Exposition, 2010, pp. 1698-1703.
[21] Y. L. Gu, Z. Y. Lu, L. J. Hang, Z. M. Qian, and G. S. Huang, “Three-level LLC series resonant DC/DC converter,” IEEE Transactions on Power Electronics, vol. 20, no. 4, pp. 781-789, July 2005.
[22] 謝士弘，LLC半橋串聯諧振式轉換器之設計考量與研製，國立台灣科技大學電子工程系碩士論文，2005年。
[23] 原田耕介著、陳連春譯，交換式電源技術手冊，建興出版社，2006年。
[24] 梁適安，交換式電源供應器之理論與實務設計，全華科技圖書出版，2011年。
[25] 吳義利，切換式電源轉換器原理與實用設計(實力設計導向)，文笙書局股份有限公司，2012年。
[26] Champion Microelectronic, “CM6901 Resonant Controller,” Datasheet, 2012.
[27] TDK Ferrite Cores for Power Supply and EMI/RFI Filter, 2007.