Abstract：In the renewable grid generation system, the traditional Boost converter has a constrained step-up ratio, big ripples and low efficiency. Therefore, a single-switch step-up converter based on the Switch-Capacitor network operationg is proposed, and its corresponding multi-stage single-switch step-up converter is deduced. Working principles and working performances of the converter in continuous operating mode and discontinuous operating mode are respectively given. An experimental model is built and its results indicates: ①Not increasing the voltage stress of semiconductor devices, these converters’ boost capability enhances as the number of Switch-Capacitor networks in series increases; ②small input-current ripple and output-voltage ripple; ③Since only one switch is needed in the converter, its control circuit is simple; ④Based on the parity of the number of Switch-Capacitor networks in series, the polarity of output-voltage can be changed, which expands its range of application.
[1] Wuhua L, Xiangning H. Review of nonisolated high step-up DC/DC converters in photovoltaic grid- connected applications[J]. IEEE Transactions on Industrial Electronics, 2011, 58(4): 1239-1250 [2] Tomaszuk A, Krupa A. High efficiency high step-up DC/DC converters - a review[J]. Bulletin of the Polish Academy of Sciences Technical Sciences, 2011, 59(4): 475-483 [3] Jun W, Jin T, Smedley K．A new interleaved isolated boost converter for high power applications[C]．IEEE Applied Power Electronics Conference, 2006. [4] Wuhua Le. A review of non-isolated high step-up DC/DC converters in renewable energy applications [C]. IEEE Applied Power Electronics Conference, 2009: 364-369. [5] Ju Won B, Myung Hyo Ryoo, Tae Jin Kim, et al．High Boost converter using voltage multiplier[C]. IEEE Annual Conference of the Industrial Electronics Society, 2005. [6] Wuhua Li, Weichen Li, Xiangning He, et al. General derivation law of nonisolated high step-up interleaved converters with builtin transformer[J]. IEEE Transactions on Industrial Electronics, 2012, 59(3): 1650-1661. [7] Weichen Li, Xiangning He. High step-up soft switching interleaved Boost converters with cross-winding-coupled inductors and reduced auxiliary switch nurnber[J]. IEEE Transactions on Power Electronics, 2009, 2(2): 125-133. [8] 彭方正, 房绪鹏, 顾斌, 等．Z源变换器[J]．电工技术学报, 2004, 19(2): 47-51. Peng Fangzheng, Fang Xupeng, Gu Bin, et al. Z-source inverter[J]. Transactions of China Electrotechnical Society, 2004, 19(2): 47-51. [9] Shih Ming Chen, Tsorng Juu Liang, Lung Sheng Yang. A cascaded high step-up DC-DC converter with single switch for microsource applications[J]. IEEE Transactions on Power Electronics, 2011, 26(4): 1146-1153. [10] Shaowu Du, Zhong Chen, Liuchen Chang. A novel soft-switching two-stage step-up DC/DC converter[C]. Conference on 7th International Power Electronics 2007: 602-607. [11] Changchien S K, Liang J F, Chen L S. et al. Step-up DC-DC converter by coupled inductor and voltage-lift technique[J]. IET Power Electron, 2010, 3(3): 369-378. [12] Tsai Fu Wu, Yu Sheng Lai, Jin Chyuan Hung, et al. Boost converter with coupled inductors and buck- boost type of active clamp[J]. IEEE Transactions on Industrial Electronics, 2008, 55(1): 154-162. [13] Rong Jong Wai, Member, Rou Yong Duan. High step-up converter with coupled-inductor[J]. IEEE Transactions on Power Electronics, 2005, 20(5): 1025-1035. [14] 姚刚, 沈燕群, 李武华, 等. 一种新型的有源交错并联Boost软开关电路[J]. 中国电机工程学报, 2005, 15(10): 65-69. Gang Yao, Yanqun Shen, Wuhua Li, et al. A new soft switching circuit for the interleaved boost converters[J]. Proceedings of CSEE, 2005, 25(10): 65-69. [15] 胡庆波, 瞿博, 吕征宇. 一种新颖的升压型电压调整器—两相交错并联耦合电感 Boost 变换器[J]. 中国电机工程学报, 2006, 26(9): 94-98. HQB, QB, LZY. A novel step-up VRM—two-phase interleaved coupled-Boost converter[J]. Proceedings of CSEE, 2006, 26(9): 94-98. [16] Choi S, Agelidis V G, Yang J, et al. Analysis, design and experimental results of a floating-ouput interleaved-input boost-derived DC-DC high-gain transformer -less converter[J]. IET Power Electronics, 2010, 4(1): 168-180. [17] 陆治国, 刘捷丰, 郑路遥, 等．输入串联输出串联高增益Boost变换器[J]．中国电机工程学报, 2010, 30(30): 27-31. Zhiguo Lu, Jiefeng Liu, Luyao Zheng, et al Input-series output-series high gain Boost converter [J]. Proceedings of the CSEE, 2010, 30(30): 27-31. [18] Fang L L, Hong Y. Positive output multiple-lift push-pull switched-capacitor luo-converters[J]. IEEE Transactions on Industrial Electronics, 2004, 51(3): 594-602. [19] He Y, Luo F L. Analysis of luo converters with voltage lift circuit[J]. IEEE Proeeedings of Electric Power Applications, 2005, 152(5): 1239-1252.
2013, Vol. 28 
