本論文主旨在於設計與研製LLC諧振轉換器，分析LLC諧振轉換器在不同負載下之功率元件導通及切換損失與變壓器的功率損耗，特別針對轉換器操作於輕載時，探討突衝模式頻率與高頻切換頻率對功率損失之影響，最後提出一輕載時之控制策略，以改善系統特性。並完成一輸入直流電壓為400V，輸出為24V/10A之LLC諧振轉換器，以驗證理論之分析與討論。

In this thesis, an LLC resonant converter is designed and implemented. The power losses of power devices and transformer are analyzed at different load conditions. Especially, the performance of LLC resonant converter operated with various burst-mode frequency and high-switching frequency are discussed and compared under light load conditions. Finally, a laboratory prototype LLC resonant converter with input 400V and output 24V/10A is implemented to verify the analysis and discussion.

[1]R. L. Steigerwald, “High-frequency resonant transistor DC-DC converters,” IEEE Trans. on Industrial Electronics, vol. IE-31, no.2, pp. 181-191, 1984.
[2]R. L. Steigerwald, “Analysis of a resonant transistor DC-DC converter with capacitive output filter,” IEEE Trans. on Industrial Electronics, vol. IE-32, no.4, pp. 439-444, 1985.
[3]W. J. Gu and K. Harada, “A new method to regulate resonant converters,” IEEE Trans. on Power Electronics, vol. 3, no. 4, pp. 430-439, 1988.
[4]I. Batarseh, “Resonant converter topologies with three and four energy storage elements,” IEEE Trans. on Power Electronics, vol. 9, no. 1, pp. 64-73, 1994.
[5]A. K. S. Bhat, “Analysis, optimization and design of a series-parallel resonant converter,” in Proc. IEEE APEC, pp. 155-164, 1990.
[6]F. C. Lee, “High-frequency quasi-resonant converter technologies,” Proceedings of the IEEE, vol. 76, no. 4, pp. 377-390, 1988.
[7]K. H. Liu and F. C. Lee., “Zero-voltage switching technique in DC-DC converters,” IEEE Trans. on Industrial Electronics, vol. 5, no. 3, pp. 293-304 1986.
[8]J. A. Sabate, R.W. Farrington, M. M. Jovanovic, and F. C. Lee, “Effect of switch capacitance on zero-voltage switching of resonant converters,” in Proc. IEEE PESC'92, vol. 1, pp. 213-220, 1992.
[9]J. A. Sabate, R.W. Farrington, M. M. Jovanovic, and F. C. Lee, “Effect of FET output capacitance on ZVS of resonant converters, ” IEEE Trans. on Aerospace and Electronics System, vol. 32, no. 1, pp. 255-266, 1996.
[10]J. S. Glaser, A. F. Witulski, and R. G. Myers, “Steady-state analysis of the constant-frequency clamped series resonant converter,” IEEE Trans. on Aerospace and Electronics System, vol. 30, no. 1, pp. 135-143, 1994.
[11]Y. Panov and M. M. Jovanovic, “Performance evaluation of 70-W two-stage adapters for notebook computers,” in Proc. IEEE APEC, vol. 2, pp. 1059-1065, 1999.
[12]R. Oruganti, J. J. Yang, and F. C. Lee, “Implementation of optimal trajectory control of series resonant converter,” IEEE Trans. on Power Electronics, vol. 3, no. 3, pp. 318-327, 1988.
[13]A. K. S. Bhat, “Analysis and design of a modified series resonant converter,” IEEE Trans. on Power Electronics, vol. 8, no. 4, pp. 423-430, 1993.
[14]A. K. S. Bhat, and M. M. Swamy, “Analysis and design of a parallel resonant converter including the effect of high-frequency transformer,” in Proc. IEEE PESC, vol. 2, pp. 768-775, 1989.
[15]R. Oruganti and T. C. How, “Resonant-tank control of parallel resonant converter,” IEEE Trans. on Power Electronics, vol. 8, no. 2, pp. 127-134, 1993.
[16]A. K. S. Bhat, “Analysis, optimization and design of a series-parallel resonant converter,” in Proc. IEEE APEC, vol. 2, pp. 155-164, 1990.
[17]M. K. Kazimierczuk, N. Thirunarayan, and S. Wang, “Analysis of series-parallel resonant converter,” IEEE Trans. on Aerospace and Electronics System, vol. 29, no. 1, pp. 88-99, 1993.
[18]R. Severns, “Topologies for three element resonant converters,” IEEE Trans. on Power Electronics, vol. 7, no. 1, pp. 89-98, 1990.
[19]R. Liu and C. Q. Lee, “Analysis and design of LLC-type series resonant converter,” Electronics Letters, vol. 24, no. 24, pp. 1517-1519, 1988.
[20]O. P. Mandhana and R. G. Hoft, “Steady state frequency domain analysis of parallel-series resonant converter,” in Proc. IEEE APEC, pp. 229-236, 1992.
[21]J. F. Lazar and R. Martinelli “Steady-state analysis of the LLC series resonant converter,” in Proc. in Proc. IEEE APEC, vol. 2, pp. 728-735, 2001.
[22]B. Yang, F. C. Lee, A. J. Zhang, and G. Huang, “LLC resonant converter for front end DC DC conversion,” in Proc. IEEE APEC, vol. 2, pp. 1108-1112, 2002.
[23]D. Fu, B. Lu, and F. C. Lee, “1MHz High Efficiency LLC Resonant Converters with Synchronous Rectifier,” in Proc. IEEE PESC, pp. 2404-2410, 2007.
[24]Y. Liang, W. Liu, B. Lu, and J. D. van Wyk, “Design of integrated passive component for a 1 MHz 1 kW half-bridge LLC resonant converter,” in Proc. IEEE IAS, vol. 3, pp. 2223-2228, 2005.
[25]T. Jin and K. Smedley, “Multiphase LLC series resonant converter for microprocessor voltage regulation,” in Proc. IEEE IAS, vol. 5, pp. 2136-2143, 2006.
[26]M. K. Kazimierczuk and D. Czarkowski, Resonant power converters, John Wiley & Sons, Inc., 1995.
[27]曾偉碩，「空載低損耗不對稱半橋電源轉換器之研究」，國立成功大學電機工程學系碩士論文，民國九十二年六月。
[28]G. C. Hsieh, C. Y. Tsai, and W. L. Hsu, “Synchronous rectification LLC series-resonant converter,” in Proc. IEEE APEC, pp.1003-1009, 2007.
[29]G. C. Hsieh, C. Y. Tsai, and S.H. Hsieh, “Design considerations for LLC series resonant converter in two resonant region,” in Proc. IEEE PESC, pp.731-736, 2007.
[30]王信雄，「切換式電源的磁性元件：原理、設計與應用」，國立清華大學先進電源科技中心訓練課程，中華民國93年。
[31]Y. Ye, C. Yan, J. Zeng, and J. Ying, “A novel light load solution for LLC series resonant converter,” IEEE INTELEC, pp.61-65, 2007.
[32]STMicroelectronics, “L6599 high-voltage resonant converter,” 2006.