本論文提出一新型高升壓比直流-直流轉換器，此轉換器使用單開關結合升壓型轉換器及一耦合電感型轉換器之串級式架構以獲得高電壓增益比。前半級為升壓型轉換器，後半級則為耦合電感與具回收漏感能量之箝位電路，減少切換開關上之跨壓，可選擇低耐壓和低導通電阻之開關元件，改善系統效率。本文先探討本轉換器架構之動作原理，並分析穩態特性。最後實作雛形電路，其電氣規格之輸入直流電壓為24 V，輸出為400 V/ 400 W，由實驗結果驗證轉換器之性能。

In this thesis, a novel high step-up DC-DC converter is proposed. The proposed converter is constructed of a boost converter with a coupled inductor technique to achieve high step-up voltage gain by a single switch. The front semi-stage is a boost converter and the rear semi-stage utilizes the coupled inductor and clamp circuit to reduce the voltage stress on the power switch. Thus, the low voltage-rating switch with low conduction resistance can be used to improve the system efficiency. The operating principle and steady-state analysis of the proposed converter are discussed in detail. Finally, a laboratory prototype circuit of the proposed converter with 24 V input voltage and 400 V/400 W output is implemented to verify the performance of the proposed converter.

[1] W. Y. Choi, S. M. Kim, S. J. Park, K. H. Kim, and Y. C. Lim, “High step-up dc-dc converter with high efficiency for photovoltaic module integrated converter systems,” IEEE INTELEC, pp. 1-4, 2009.
[2] J. M. Kwon, B. H. Kwon, and K. H. Nam, “High-efficiency module-integrated photovoltaic power conditioning system,” IET Power Electronics, vol. 2, no. 4, pp. 410-420, Mar. 2009.
[3] R. J. Wai, W. H. Wang, and C. Y. Lin, “High-performance stand-alone photovoltaic generation system,” IEEE Trans. on Industrial Electronics, vol. 55, no. 1, pp. 240-250, Jan. 2008.
[4] R. J. Wai and W. H. Wang, “Grid-connected photovoltaic generation system,” IEEE Trans. on Circuits and Systems, vol. 55, no. 3, pp. 953-964, Apr. 2008.
[5] R. J. Wai and R. Y. Duan, “High step-up converter with coupled-inductor,” IEEE Trans. on Power Electronics, vol. 20, no. 5, pp. 1025-1035, Sep. 2005.
[6] Q. Zhao and F. C. Lee, “High-efficiency, high step-up dc-dc converters,” IEEE Trans. on Power Electronics, vol. 18, no. 1, pp. 65-73, Jan. 2003.
[7] W. Li, X. Lv, Y. Deng, J. Liu, and X. He, “A review of non-isolated high step-up dc/dc converters in renewable energy applications,” IEEE APEC, pp. 364-369, 2009.
[8] R. J. Wai and W. H. Wang, “Design of grid-connected photovoltaic generation system with high step-up converter and sliding-mode inverter control,” IEEE CCA on Control Applications, pp. 1179-1184, 2007.
[9] R. J. Wai, C. Y. Lin, and W. H. Wang, “Novel power control scheme for stand-alone photovoltaic generation system,” IEEE IECON, pp. 97-102, 2006.
[10] W. Y. Choi, S. G. Song, S. J. Park, K. H. Kim, and Y. C. Lim, “Photovoltaic module integrated converter system minimizing input ripple current for inverter load,” IEEE INTELEC, pp. 1-4, 2009.
[11] B. Axelrod, Y. Berkovich, and A. Ioinovici, “Switched-capacitor/switched-inductor structures for getting transformerless hybrid dc-dc pwm converters,” IEEE Trans. on circuits and systems, vol. 55, no. 2, pp. 687-696, Mar. 2008.
[12] M. Prudente, L. L. Pfitscher, and R. Gules, “A boost converter with voltage multiplier cells,” IEEE PESC, pp. 2716-2721, 2005.
[13] F. L. Luo and H. Ye, “Positive output cascade boost converters,” IEE Proc. Electric. Power Applications, vol. 151, no. 5, pp. 590-606, 2004.
[14] W. Li and X. He, “High step-up soft switching interleaved boost converters with cross-winding-coupled inductors and reduced auxiliary switch number,” IET Power Electronics, vol. 2, no. 2, pp. 125-133, Nov. 2007.
[15] R. Watson, F. C. Lee, and G. C. Hua, “Utilization of an active-clamp circuit to achieve soft switching in flyback converters,” IEEE Trans. on Power Electronics, vol. 11, no. 1, pp. 162-169, Jan. 1996.
[16] R. J. Wai, C. Y. Lin, R. Y. Duan, and Y. R. Chang, “High-efficiency dc-dc converter with high voltage gain and reduced switch stress,” IEEE Trans. on Industrial Electronics, vol. 54, no. 1, pp. 354-364, Feb. 2007.
[17] Y. He and F. L. Luo, “Analysis of Luo converters with voltage-lift circuit,” IEE Proc. Electric. Power Applications, vol. 152, no. 5, pp. 1239-1252, Sep. 2005.
[18] K. C. Tseng and T. J. Liang, “Novel high-efficiency step-up converter,” IEE Proc. Electric. Power Applications, vol. 151, no. 2, pp. 182-190, Mar. 2004.
[19] R. J. Wai, C. Y. Lin, C. Y. Lin, R. Y. Duan, and Y. R. Chang, “High-efficiency power conversion system for kilowatt-level stand-alone generation unit with low input voltage,” IEEE Trans. on Industrial Electronics, vol. 55, no. 10, pp. 3702-3714, Oct. 2008.
[20] W. Li, J. Wu, R. Xie, and X. He, “A non-isolated interleaved ZVT boost converter with high step-up conversion derived from its isolated counterpart,” EPE Power Electronics, pp. 1-8, 2007.
[21] M. G. O. Lopez, J. L. Ramos, L. H. D. Saldierna, J. M. G. Ibarra, and E. E. C. Gutierrez, “Current-mode control for a quadratic boost converter with a single switch,” IEEE PESC, pp. 2652-2657, 2007.
[22] J. A. M. Saldana, R. G. Quirino, J. L. Ramos, E. E. C. Gutierrez, and M. G. O. Lopez, “Multiloop controller design for a quadratic boost converter,” IET Electric. Power Applications, vol. 1, no. 3, pp. 362-367, Jan. 2007.
[23] B. Axelrod, Y. Berkovich, and A. Ioinovici, “Switched coupled-inductor cell for dc-dc converters with very large conversion ratio,” IEEE IECON, pp. 2366-2371, 2006.
[24] Q. Zhao and F. C. Lee, “High performance coupled-inductor dc-dc converters,” IEEE APEC, vol. 1, pp. 109-113, 2003.
[25] T. F. Wu, Y. S. Lai, J. C. Hung, and Y. M. Chen, “Boost converter with coupled inductors and buck-boost type of active clamp,” IEEE Trans. on Industrial Electronics, vol. 55, no. 1, pp. 154-162, Jan. 2008.
[26] J. W. Baek, M. H. Ryoo, T. J. Kim, D. W. Yoo, and J. S. Kim, “High boost converter using voltage multiplier,” IEEE IECON, pp. 6, 2005.
[27] R. J. Wai and R. Y. Duan, “High-efficiency dc/dc converter with high voltage gain,” IEE Proc. Electric. Power Applications, vol. 152, no. 4, pp. 793-802, Jul. 2005.
[28] S. K. Changchien, T. J. Liang, J. F. Chen, and L. S. Yang, “Novel high step-up dc-dc converter for fuel cell energy conversion system,” IEEE Trans. on Industrial Electronics, vol. 57, pp. 2007-2017, May 2010.
[29] I. Batarseh, Power Electronic Circuits, Johm Wiley & Sons, 2004.
[30] 梁適安，高頻交換式電源供應器原理與設計 第二版，全華圖書股份有限公司，民國八十四年。
[31] TL494Datasheet, Texas Instruments,2008.