本論文主要研製一台2.1 kW高效率車用直流充電器，其輸出為200 V至420 V，主要架構採用雙組輸出交錯式半橋LLC串聯諧振轉換器，輸出電壓分別為150 V及300 V。第一組輸出電壓150 V係利用調整切換頻率達成穩壓，另一組輸出電壓300 V則作為後級降壓型轉換器之輸入電壓；降壓型轉換器以脈波寬度調變方式調整輸出電壓，並將此可調電壓與第一組輸出電壓150 V疊接，而得到總輸出電壓。LLC串聯諧振轉換器操作於Region-2時，變壓器一次側開關具有零電壓切換之特性，變壓器二次側之二極體具有零電流切換特性，因此可減少切換損耗，提升整機效率；且因為交錯式操作之緣故，可有效降低輸入電容之電流應力及其漣波成份。最後，本文設計2.1 kW之高效率車用直流充電器雛型電路以驗證可行性，根據實驗結果，在低壓輸出、半載以上的效率可達93%以上；而在高壓輸出、半載以上的效率可達95%以上。

This thesis presents the design and implementation of a 2.1-kW high-efficiency vehicular DC charger. The output voltage range is from 200 V to 420 V. The adopted topology is a dual-output interleaved half-bridge LLC series resonant converter (SRC). The first output voltage is 150 V, which is regulated by adjusting the switching frequency. The second output voltage is 300 V, which supplies to a buck post regulator with pulse-width modulation (PWM) control. The tunable output voltage of the buck converter is cascoded with the regulated 150-V output of the first LLC SRC to become the actual output voltage. Under region-2 operations, the half-bridge LLC SRC can achieve zero-voltage switching (ZVS) at primary side and zero-current switching (ZCS) at secondary side. The switching losses can thus be reduced significantly and the overall efficiency can be improved. Moreover, due to interleaved operation, the current stress and ripple of the input capacitor can be effectively decreased. Finally, a 2.1-kW laboratory prototype for the studied high-efficiency vehicular DC charger is built and tested to verify the feasibility of the proposed scheme. According to the experimental results, from half load to full load, the efficiencies can be up to 92% and 95 % at 200-V output and 420-V output, respectively.

[1]F. C. Lee, "High-frequency quasi-resonant and multi-eesonant converter technologies," Industrial Electronics Society, 1988. IECON '88. Proceedings., 14 Annual Conference of , vol.3, no., pp.509,521, 24-28, Oct. 1988
[2]J. T. Feng, Y. Hu, W. Chen, and W. Chau-Chun, "ZVS analysis of asymmetrical half-bridge converter," Power Electronics Specialists Conference, 2001. PESC. 2001 IEEE 32nd Annual , vol.1, no., pp.243,247 vol. 1, 2001
[3]J. G. Cho, Sabate, J. A., and F. C. Lee, "Novel full bridge zero-voltage-transition PWM DC/DC converter for high power applications," Applied Power Electronics Conference and Exposition, 1994. APEC '94. Conference Proceedings 1994., Ninth Annual , vol., no., pp.143,149 vol.1, 13-17, Feb 1994
[4]C. M. Wang, "A new family of zero-current-switching (ZCS) PWM converters," Industrial Electronics, IEEE Transactions on , vol.52, no.4, pp.1117,1125, Aug. 2005
[5]J. W. Baek, J. G. Cho, D. W. Yoo, G. -H. Rim, and H. -G, Kim, "An improved zero voltage and zero current switching full bridge PWM converter with secondary active clamp," Power Electronics Specialists Conference, 1998. PESC 98 Record. 29th Annual IEEE , vol.2, no., pp.948,954 vol.2, 17-22, May 1998
[6]Y. S. Dow, H. I. Son, and H. D. Lee, "A study on half bridge LLC resonant converter for battery charger on board," Power Electronics and ECCE Asia (ICPE & ECCE), 2011 IEEE 8th International Conference on , vol., no., pp.2694,2698, May 30 2011-June 3 2011
[7]J. H. Kim, C. E. Kim, J. K. Kim, and G. W. Moon, "Analysis for LLC resonant converter considering parasitic components at very light load condition," Power Electronics and ECCE Asia (ICPE & ECCE), 2011 IEEE 8th International Conference on , vol., no., pp.1863,1868, May 30 2011-June 3 2011
[8]B. C. Kim, K. B. Park, and G. W. Moon, "Analysis and design of two-phase interleaved LLC resonant converter considering load sharing," Energy Conversion Congress and Exposition, 2009. ECCE 2009. IEEE , vol., no., pp.1141,1144, 20-24 Sept. 2009
[9]R. Liu and C. Q. Lee, "Analysis and design of LLC-type series resonant converter, " IEEE Proc. Vol. 24, pp. 1517-1519, 1988.
[10]A. K. S. Bhat, "Analysis and Design of a Modified Series Resonant Converter," IEEE Transactions on Power Electronics, pp. 423-430, 1993.
[11]K. Siri and C. Q. Lee, "Constant switching frequency LLC-type series resonant converter," IEEE Circuits and Systems, Vol. 1, pp. 513-516, 1989.
[12]謝儲仲，「寬輸入電壓範圍之雙組輸出半橋LLC串聯諧振轉換器研製」，國立台灣科技大學電子工程系碩士論文， 2009
[13]顏上進，「串聯諧振轉換器輕載調制策略之研究」，國立台灣科技大學電子工程系博士論文， 2006
[14]E. Orietti, P. Mattavelli, G. Spiazzi, C. Adragna, and G. Gattavari, "Analysis of multi-phase LLC resonant converters," Power Electronics Conference, 2009. COBEP '09. Brazilian , vol., no., pp.464,471, Sept. 27 2009-Oct. 1 2009
[15]B. R. Lin, W. R. Yang, J. J. Chen, C. L. Huang, and M. H. Yu, "Interleaved LLC series converter with output voltage doubler," Power Electronics Conference (IPEC), 2010 International , vol., no., pp.92,98, 21-24 June 2010
[16]李家源，「500W交錯式半橋型串連諧振轉換器研製」，國立台灣科技大學電子工程系碩士論文， 2010
[17]M. A. Halim, M. N. Seroji, and M. N. bin Hidayat, "Analysis characteristics and optimal design procedure of half-bridge LLC loaded resonant converter, "Power and Energy (PECon), 2012 IEEE International Conference on , vol., no., pp.564,569, 2-5 Dec. 2012
[18]R. L. Lin and C. W. Lin, "Design criteria for resonant tank of LLC DC-DC resonant converter," IECON 2010 - 36th Annual Conference on IEEE Industrial Electronics Society , vol., no., pp.427,432, 7-10 Nov. 2010
[19]C. A. Cheng, H. W. Chen, E. C. Chang, C. H. Yen, and K. J. Lin, "Efficiency study for a 150W LLC resonant converter," Power Electronics and Drive Systems, 2009. PEDS 2009. International Conference on , vol., no., pp.1261,1265, 2-5 Nov. 2009
[20]L. Yan, L. Wenduo, L. Bing, and D. J. Wyk, "Design of Integrated passive component for a 1MHz 1KW half-bridge LLC resonant converter," IEEE IAC, Vol. 3, pp. 2223-2228, 2005.
[21]B. Lu, W. Liu, Y. Liang, F. C. Lee, and J. D. Van Wyk, "Optimal design methodology for LLC resonant converter," IEEE APEC, pp. 533–538. 2006.
[22]S. C. Wong, A. D. Brown, Y. S. Lee, and S. W. Ng, "Parasitic losses modeling of a series resonant converter circuit," IEEE Circuits and Systems, Vol. 1, pp. 921-924, 1997.
[23]Y. Liu, "High Efficiency Optimization of LLC Resonant Converter for Wide Load Range," Blacksburg, Virginia. December 4th, 2007.
[24]R. W. Erickson and D. Maksimovic, "Fundamentals of Power Electronics," Kluwer Academic Publishers, Second Edition, 1999.
[25]N. Mohan, T. M. Undeland, and W. P. Robbins, Power Electronics Converters, Applications and Design, John Wiley & Sons, 3rd Edition, 2003.
[26]A. I. Pressman, Switching Power Supply Design, Second Edition, McGraw-Hill International. 1998.
[27]梁適安，「交換式電源供給器之理論與實務設計」，全華圖書出版社， 2008
[28]吳義利，「切換式電源轉換器」，文笙書局， 2012
[29]EPARC，「電力電子學綜論」，全華圖書出版社， 2007
[30]Texas Instruments, "UC3895 - BiCMOS Advanced Phase-Shift PWM Controller," Data Sheet, 2008.