本論文提出一具高轉換比之單開關串接昇降壓型轉換器。將一般昇降壓型轉換器串接雖可得到高轉換比，然而卻有開關過多與電路複雜的缺點。因此，為了降低開關元件數量與簡化開關控制電路，本文提出單開關串接昇降壓型轉換器，藉由電路整合將傳統串接轉換器多個開關數整合為單一開關。而將此方法應用至傳統串接返馳式轉換器，也能達到相同目的。本文首先說明二階單開關串接昇降壓型轉換器之電路動作原理，並推導系統轉移函數以進行小訊號分析，其次設計主電路元件參數。最後實際製作一組輸入電壓為48V，輸出電壓10~260V，輸出功率30W之二階單開關串接昇降壓轉換器，並藉由實驗結果驗證本論文架構的理論分析。

This thesis presents a single-switch cascade buck-boost converter with high conversion ratio. Although high conversion ratio can be achieved by cascade of buck-boost converters, the complexities of the overall structure also increase with the number of used buck-boost converters. So, this thesis presents a structure of a single-switch cascade buck-boost converter to reduce the number of switches and simplify control circuits. By the union of conventional circuits, the switches can be integrated into one switch. This technique is also applicable to conventional flyback converters. First, the operational principles and DC and AC small signal analysis of two-stage single-switch cascade buck-boost converter are performed. Then, design procedures of the proposed structure are described. Finally, a laboratory prototype of a two-stage single-switch cascade buck-boost converter with an input voltage of 48V, an output voltage of 10~260V, and an output power of 30W is implemented. The experimental results are verified with theoretical analysis of the proposed structure.

[1] J. Melis, “Ballast Design Overview,”http://www.ballastdesign.com/.
[2] J. Perkinson, “UPS Systems-A Review,” in Proc. IEEE-APEC’88, pp. 151-154.
[3] R. W Erickson and D. Maksimovic, Fundamentals of Power Electronics. edition, John Wiley, New York, 1950.
[4] Ned Mohan, T. M. Undeland, and W. P. Robbins, Power Electronics, edition, John Wiley & Sons, Inc. New York, 1995.
[5] D. W. Hart, Introduction to Power Electronics. Prentice-Hill, New York, 1964.
[6] L. H. Dixon, “Control Loop Cookbook,” Unitrode Power Supply Design Seminar, SEM-1200, pp. C4-1~C4-26, 1997.
[7] A. P. Van den Bossche, K. De Gusseme, and J. A. Melkebeek, “ZVZC Dc-Dc Converter For Electrical Bike Using A 230V Series Motor,” in Proc. Of the 10th Eur. Conf. on Power Electr. and Applic., EPE 2003, Sept. 2-4, 2003, Toulouse, France, on CD-rom.
[8] J. Akerlund, “-48V DC Computer Equipment Topology – An Emerging Technology,” in proc. IEEE-INTELEC’ 1998 Ann. Meet., pp. 15-21.
[9] L. Huber and M. M. Jovanovic, “A Design Approach for Server Power Supplies For Networking.” in Proc. IEEE-APEC’ 2000 Ann. Meet., Vol. 2 pp. 1163-1169, Feb. 2000.
[10] F. L. Luo and H. Ye, Advanced DC/DC converters. CRC Press, Boca Ratio, Florida, USA, 2003.
[11] F. L. Luo and H. Ye, “Positive Output Cascade Boost Converters,” IEE Proc-Electr. Power Appt., Vol. 151, No. 5, pp. 590-606, Sept. 2004.
[12] Q. Zhao, F. Tao, and F. C. Lee, “A Front-end DC/DC Converter for Network Server Applications,” IEEE Power Electronics Specialists Conf., pp. 1535-1539, 2001.
[13] Q. Zhao and F. C. Lee, “High-Efficiency, High Step-up DC-DC Converters,” IEEE Transactions on Power Electronics, Vol. 18, No. 1, pp. 65-73, Jan. 2003.
[14] Q. Zhao and F. C, Lee, “High Performance Coupled-inductor DC-DC Converters,” in Proc. IEEE-APEC’ 2003 Ann. Meet., Vol. 1 pp. 109-113, Feb. 2003.
[15] K. C. Tseng, T. J. Liang and J. F. Chen, “Analysis and Design of a Novel High-Efficiency Step-up Power Converter,” IEE Proc.-Electr. Power Appl., Vol. 152, No. 2, March 2005.
[16] O. Krykunov, “Analysis of the Extended Forward Converter for Fuel Cell Applications,” IEEE International Symposium on Industrial Electronics, pp.661-666, June 2007.
[17] D. M. Van de Sype, K. De Gusseme, W. R. Ryckaert, A. P. Van den Bossche, and J. A. Melkebeek, “A Single Switch Buck-boost Converter with a High Conversion Ratio,” in Proc. European-PEA, pp. 10, Sept. 2005.
[18] J. Yu and J. Xu, “Time Averaging Equivalent Circuit Analysis For A Class of Periodically Switching Linear Network,” in Proc. IEEE-CS, Vol. 2, pp. 1139-1142, June 1988.
[19] J. Xu, “Modeling and Analysis of Switching DC-DC Converter With Coupled-Inductor,” in Proc. IEEE-CS, Vol. 2, pp. 717-720, June 1991.
[20] ST, “STP12NM50FD Data Sheets”.
[21] ON, “MUR460 Data Sheets”.