本論文研究為「半橋諧振式電容LLC轉換器之分析與研製」，電路採用半橋諧振電容式開關電路，降低輸入電流漣波。另外轉換器之諧振電容與半橋分壓電容整合，達到節省元件使用之功能。架構中變壓器的高壓端採取串聯接法，在低壓端採取中心抽頭式並聯接法，因此可減少單顆變壓器電壓及電流應力。此接法可使雙變壓器達到均壓與均流之功能，減緩變壓器功率分擔不平衡問題。本論文首先說明電路之動作原理及等效諧振槽模型分析，並探討相關參數之設計。最後，實際設計輸入電壓為400V，輸出為24V，600W之半橋諧振電容式LLC轉換器，以驗證電路之可實性。

In this thesis, a half-bridge resonant capacitance switching network LLC converter is analyzed and implemented. The half-bridge resonant capacitors switching network is adopted to reduce the input current ripple. The resonant capacitors and the input capacitors are integrated so that the components can be reduced. Two transformers are connected in series on the primary side and in parallel on the secondary side, thus the voltage stress and current stress is reduced. Since the voltage and current are automatically balanced between two transformers so that their power capacity is balanced. The operating principle is analyzed, the equivalent circuit of the resonant tank is analyzed, and some important parameters are designed. Finally, a LLC half-bridge resonant converter with 400V input voltage, 24V/600W output is implemented to verify the feasibility and effectiveness of the proposed LLC converter.

參考文獻
[1] R. Watson, F. C. Lee, and G. C. Hua, “Utilization of an active-clamp circuit to achieve soft switching in flyback converters,” IEEE Trans. Power Electron,vol. 8, pp. 162-169, 1996
[2] F. C. Lee, “Higf-frequency quasi-resonant converter technologies,” Proceedings of the IEEE ,vol. 76, no. 4, pp. 377-390, 1988
[3] M. M. Jovanovic, R. Farrington, and F. C. Lee, “Comparison of half-bridge off-line,ZCS-QRC and ZVS-MRC,” IEEE Trans. on Aerospace and Electronic Systems, vol.26, no
. 2, pp. 326-336, 1990.
[4] B. R. Lin, J. Y. Dong, and J. J. Chen, “Analysis and implementation of a ZVS/ZCS DC–DC switching converter with voltage step-up,” IEEE Trans. on Industrial
Electronics, vol. 58, no. 7, pp. 2962-2971, 2011.
[5] F.C.Lee, “High-Frequency quasi resonant ant multi-resonant converter technologies, ”In Proc. IEEE Int. Conf. Ind. Electron., vol.3, pp. 509-521, October 1988.
[6] K. H. Liu and F. C. Lee,“Zero-voltage switching technique in DC-DC converter, ”IEEE Trans. on Power Electronics, vol.5, pp. 293-304, 1990.
[7] A. K. S. Bhat, “Analysis design of a modified series resonant converter,” IEEE Tran.on Power Electronics, vol.8, pp. 423-430, 1993.
[8] J. A. Matin-Ramos, J. Diaz, A. M. Pernia, J. M. Lopera, and F. Nuno, “Dynamic and steady-state models for the PRC-LCC resonant topology with a capacitor as output
filter,” IEEE Trans. on Industrial Electronics, vol. 54, no. 4, pp. 2262-2275, 2007.
[9] A. K. S. Bhat, “Analysis, optimization and design of a series-parallel resonant converter,” in Proc. IEEE APEC, pp. 155-164, 1990.
[10] H. Sheng, W. Shen, H. Wang, D. Fu, Y. Pei, X. Yang, F. Wang, D. Boroyevich, F. C. Lee, and C. W. Tipton, “Design and implementation of a high power density three-level parallel resonant converter for capacitor charging pulsed-power supply,” IEEE Trans. on Plasma Science, vol. 39, no. 4, pp. 1131-1140,2011.
[11] R. Lin, L Batarseh, and C. Q. Lee, “Comparison of performance characteristics between LLC-type and conventional parallel resonant converter,” Electronics Letters, vol. 24, pp. 1510-1511, 1988.
[12] W. Feng, F. C. Lee, and P. Mattavelli , “Optimal trajectory control of burst for LLC resonant converter,” IEEE Trans. Power Electron, vol. 28,no1,pp. 457-466, 2013
[13] R. Liu and C. Q. Lee, “Analysis and design of LLC-type series resonant converter,”IEEE Electronics Letters, vol. 24, no. 24, pp. 1517-1519, 1988.
[14] 陳克銘，「具耦合電感倍流整流之半橋雙 LLC 轉換器研製」，國立成功大學電機工程學系碩士論文，民國一百零一年五月。
[15] E. S. Kim, K. H. Lee, B. G. Chung, and M. H. Kye, “A novel topology of LLC resonant inverter with two resonant tanks for Power Conditioning System,” in Proc.IEEE APEC, pp. 1698-1703, 2010
[16] R. L. Lin and C. W. Lin, “Design criteria for resonant tank of LLC DC-DC resonant converter,” in Proc. IEEE IECON, pp. 427-432, 2010.
[17] B. Lu, W.Liu, Y.Liang, F.C.Lee, and J.D. Van Wyk, “Optimal design methodology for LLC resonant conberter,” in Proc. IEEE APEC’06 pp.533-539, 2006.
[18] 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論文，民國九十六年七月。
[19] SAMSUNG Electronics Co, “Theoretical Analysis and Optimal Design of LLC Resonant Converter,”,2012
[20] G. C. Heish , C. Y. Tsai, and W.L. Hsu,“Synchronous rectification LLC series resonant converter, ” IEEE APEC’ 07, pp. 1003-1009, 2007
[21] M. Borage, S. Tiwari, and S. Kotaiah, “Constant-current, constant-voltage half-bridge resonant power supply for capacitor charging,” IEEE Proc. Electr. Power Appl, vol.
153, no. 3, 343-347 May 2006
[22] Y. C. Chuang, Y.L. Ke, H.S. Chuang, and Jung-Tai Chen, “A novel loaded-resonant converter for the application of DC-to-DC energy conversions,” IEEE Trans.
on Industrial applications, vol. 48, no. 2, 742-749, 2012
[23] C. H. Chien, Y.H. Wang, B.R. Lin, and C.H. Liu,“Implementation of an interleaved resonant converter for high-voltage applications,” IET Power Electron., vol. 5, iss. 4,pp. 447–455, 2012
[24] C. Zhu ,“A novel two switch forward converter with two transformers and LLC circuit,”In Proc Telecommunications Energy Conference, pp. 415-419, 2007
[25] K. H. Yoon, Y. J. Noh, S. H. Jang, and E. S. Kim,“LLC resonant converter with wide input voltage and load range at fixed switching frequency, ”In Proc Applied Power
Electronics Conference and Exposition (APEC), pp1338 1342,2012
[26] F. Musavi, M. Craciun, S. Gautam, W. Eberle, and W. G. Dunford, “An LLC resonant DC-DC converter for wide output voltage range battery charging applications,” IEEE Trans. Power Electron, pp. 1-8, 2013
[27] J. K. Park, W. Y. Choi, and B. H. Kwon, “A step-up DC–DC converter with a resonant voltage doubler, ”Proc IEEE Trans.on Industrial Electronics, vol. 54, no. 6, pp.3267-3275, 2007.
[28] H. Wu, S. Ji, ,F. C. Lee, and X. Wu, “Multi-channel constant current (MC3) LLC resonant LED driver, ”In Proc Energy Conversion Congress and Exposition (ECCE), pp.2568-2575,2011
[29] B. R. Lin, and J. Y. Dong, “ ZVS resonant converter with parallel–series transformer connection,” IEEE Trans. on Industrial Electronics, vol. 58, no. 7, pp.2972-2979,2011
[30] B. R. Lin and S.F. Wu ,“ ZVS resonant converter With Series-Connected Transformers,”IEEE Trans.on Industrial Electronics, vol. 58, no. 8, pp.3547-3554,2011
[31] B.R. Lin ,and S.F. Wu,“ Implementation of a series resonant converter with series–parallel transformers,” Power Electronics, IET,pp.919-926,2011.
[32] G. C. Hsieh, C.Y. Tsai, and S. H. Heish, “Design considerations for LLC series-resonant converter in two-resonant reions, ”In Proc Power Electronics Specialists Conference, pp.731-736,2007
[33] D. Huang, D. Fu, F. C. Lee, and P. Kong,“ High-frequency high-efficiency CLL resonant converter with synchronous recifiers, ”IEEE Trans. On Industry Electronics,
vol. 58, no8, PP. 3461-3470,2011.
[34] STMicroelectronics, ”L6599 high-voltage resonant converter, ”2006.