本論文主要為探討三組輸出LLC諧振轉換器之設計。LLC諧振轉換器具有高效率之優點，廣泛應用於需多組輸出電源之電子產品。視負載需求，輸出電壓調節範圍須符合規格，但多組輸出轉換器在輕重載交互調節時，各組輸出電壓有超出規格的問題，此部分是值得探討之課題。本論文首先介紹各種諧振轉換器與LLC諧振轉換器，並分析三組輸出LLC諧振轉換器動作原理及設計過程，而在輸出電壓交互調節上，採用權重比回授控制，並以空間向量表示法分析輕重載電壓交互調節率，接著設計其控制器。最後實際製作一具三組輸出之LLC諧振轉換器，輸入電壓為400V，輸出為24 V/5 A 、12 V/5 A及5 V/5 A，其電壓調節率可控制在±5.8 %以內，滿載效率達91.5%。

In this thesis, a triple-output LLC resonant converter is analyzed and discussed. LLC resonant converter togology is widely used in power supply of multi-output electronic products, because it has the merit of high efficiency. According to load demand, the output voltage regulation range is restricted by specifications. The output voltages of the multi-output converter regulated between heavy and light loads exists an issue that their output voltages drift out of specifications. This is an important issue to explore. Several resonant converters and the LLC resonant converter are presented first. Then, operational principles and design process are addressed. The output voltages cross regulation are adopted by weighted feedback gain control and analyzed by space-vector method. Finally, a triple-output LLC resonant converter with input voltage 400 V has been implemented. The triple outputs are 24 V/5 A, 12 V/5 A and 5 V/5 A, and the output voltage regulation is under ±6 %. The efficiency of the proposed converter is 91.5 % at the full-load condition.

[1] F. C. Lee, “High-Frequency Quasi-Resonant and Multi-Resonant Converter Technologies,” in Proc. IEEE Int. Conf. Ind. Electron., vol. 3, pp. 509-521, October 1988.
[2] K. H. Liu and F. C. Lee, “Zero-Voltage Switching Technique in DC-DC Converters,” IEEE Trans. on Power Electronics, vol. 5, pp. 293-304, July 1990.
[3] C. M. Wang, “A New Family of Zero-Current-Switching (ZCS) PWM Converters,” IEEE Trans. on Industrial Electronics, vol. 52, pp. 1117-1125, Aug. 2005.
[4] A. K. S. Bhat, “Analysis and Design of a Modified Series Resonant Converter,” IEEE Trans. on Power Electronics, vol.8, pp. 423-430, Oct. 1993.
[5] J. T. Feng, Y. Q. Hu, W. Chen, and C. C. Wen, “ZVS Analysis of Asymmetrical Half-Bridge Converter,” in Proc. IEEE PESC 2001, vol. 1, pp. 243-247, June 2001.
[6] R. Liu and C. Q. Lee, “Analysis and Design of LLC-Type Series Resonant Converter,” Electronics Letters, vol. 24, pp. 1517-1519, Nov. 1988.
[7] R. Liu, C. Q. Lee, and A. K. Upadhyay, “Experimental Study of the LLC-type Series Resonant Converter,” in Proc. IEEE APEC’91, pp. 31-37, March 1991.
[8] K. Siri and C. Q. Lee, “Constant Switching Frequency LLC-Type Series Resonant Converter,” IEEE Trans. on Circuits and Systems, vol. 1, pp. 513-516, Aug. 1989.
[9] B. Yang, F. C. Lee, A. J. Zhang, and G. S. Huang, “LLC Resonant Converter for Front End DC-DC Conversion,” in Proc. IEEE APEC’02, vol. 2, pp. 1108-1112, March 2002.
[10] B. Yang, “Topology Investigation for Front End DC/DC Power Conversion for Distributed Power,” Ph.D. Dissertation, Virginia Tech, Blacksburg, VA, USA, Feb. 2003.
[11] R. L. Steigerwald, “A Comparison of Half-Bridge Resonant Converter Topologies,” IEEE Trans. on Power electronics, vol. 3, pp. 174-182, April 1988.
[12] R. Liu, L. Batarseh, and C. Q. Lee, “Comparison of Performance Characteristics between LLC-type and Conventional Parallel Resonant Converters,” Electronics Letters, vol. 24, pp. 1510-1511, Nov. 1988.
[13] L. J. Hang, Y. L. Gu, Z. Y. Lu, and Z. M. Qian, “Multi-Output LLC Resonant Converters with Symmetrical Auxiliary Output Structures,” in Proc. IEEE INTELEC’06, pp. 1-5. Sept. 2006.
[14] Y. L. Gu, Z. Y. Lu, and Z. M. Qian, “A Novel LLC Resonant Converter Topology: Voltage Stresses of All Components in Secondary Side Being Half of Output Voltage,” in Proc. IEEE IPEMC’06, vol. 1, pp. 1-5, Aug. 2006.
[15] B. Lu, W. Liu, Y. Liang, F. C. Lee, and J. D. Van Wyk, ”Optimal Design Methodology for LLC Resonant Converter,” in Proc. IEEE APEC’06, pp. 533–538. March 2006.
[16] J. P. Agrawal, K. Siri, and C. Q. Lee, “Determination and Minimization of Cross Regulation in Multi-Output High Order SRC,” IEEE Trans. on Circuits and Systems, vol. 1, pp. 692-695. May 1990.
[17] J. P. Agrawal and C. Q. Lee, “Determination of Cross Regulation in Multi-Output Resonant Converters,” in Proc. IEEE APEC’90, pp. 697-705, March 1990.
[18] J. P. Agrawal and C. Q. Lee, “Effects of Resistances and Leakage Inductances on Cross Regulation in SRC,” in Proc. IEEE APEC’91, pp. 65-70, March 1991.
[19] Q. Chen, F. C. Lee, and M. M. Jovanovic, “Analysis and Design of Multiple-Output Converters with Stacked Secondaries,” in Proc. IEEE INTELEC’93, vol. 1, pp. 365-371, Sept. 1993.
[20] Q. Chen, F. C. Lee, and M. M. Jovanovic, “Analysis and Design of Weighted Voltage-Mode Control for a Multiple-Output Forward Converter,” in Proc. IEEE APEC’93, pp. 449-455, March 1993.
[21] Q. Chen, F. C. Lee, and M. M. Jovanovic, “Small-Signal Analysis and Design of Weighted Voltage-Mode Control for a Multiple-Output Forward Converter,” in Proc. IEEE PESC’93, pp. 749-756, June 1993.
[22] C. Ji, K. M. Smith, Jr, K. M. Smedley, and K. King, “Cross Regulation in Flyback Converters: Analytic Model and Solution,” IEEE Trans. on Power Electronics, vol. 16, no.2, pp. 231-239, March 2001.
[23] Y. K. Lo, S. C. Yen, and T. H. Song, “Analysis and Design of a Double-Output Series-Resonant DC-DC Converter,” IEEE Trans. on Power electronics, vol.22, pp. 952-959, May 2007.
[24] 王國政，液晶顯示器整合型電源供應器之研製，國立成功大學電機工程學系碩士論文，民國九十六年七月。
[25] 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學系碩士論文，民國九十六年七月。
[26] STMicroelectronics, “LLC Resonant Half-bridge Converter Design Guideline,” AN2450 Application note, March 2007.
[27] ON Semiconductor, “How to Deal with Leakage Elements in Flyback Converter,” AN1679/D, September 2005.
[28] 梁適安，交換式電源供給器之理論與實務設計，全華科技圖書股份有限公司，民國八十三年。
[29] EPARC，電力電子學綜論，全華科技圖書股份有限公司，民國九十五年。
[30] STMicroelectronics, “L6599 High-Voltage Resonant Controller,” May 2006.
[31] FAIRCHILD, “TL431/TL431A Programmable Shunt Regulator,” 2003.