Abstract：A cascaded high step-up DC-DC converter with three-winding coupled inductor is proposed in this paper. Through the three-winding coupled inductor, switched-capacitor technique and cascaded structure, the converter achieves high step-up voltage gain without large duty cycle. The input inductor of the proposed converter can reduce the input current ripple, hence stress on the input source is reduced. Additionally, the energy stored in the leakage inductor of the coupled inductor is recycled to the output terminal, which not only improves efficiency but also alleviates large voltage spike to reduce the voltage stress. The operating principles and steady-state analyses of continuous-conduction mode are discussed in detail in this paper. Finally, a prototype sample with 30V input and 380V/0.3A output is implemented and the experimental results verify the correction of the theoretical analysis.
[1] 高文祥, 王明渝, 王立健, 等. 光伏微型逆变器研究综述[J]. 电力系统保护与控制, 2012, 40(21): 147-155. Gao Wenxiang, Wang Mingyu, Wang Lijian, et al. Review of research on photovoltaic micro-inverter[J]. Power System Protection and Control, 2012, 40(21): 147-155. [2] Li W, He X. 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. [3] Jain S, Agarwal V. A single-stage grid connected inverter topology for solar PV systems with maxi- mum power point tracking[J]. IEEE Transactions on Power Electronics, 2007, 22(5): 1928-1940. [4] Gu B, Dominic J, Lai J S, et al. High Boost ratio hybrid transformer DC-DC converter for photovoltaic module applications[J]. IEEE Transactions on Power Electronics, 2012, 28(4): 2048-2058. [5] Hsieh Y P, Chen J F, Liang T J, et al. Novel high step-up DC-DC converter with coupled-inductor and switched-capacitor techniques for a sustainable energy system[J]. IEEE Transactions on Power Electronics, 2012, 59(2): 998-1007. [6] Erickson R W,Maksimovi D. Fundamentals of power electronics[M]. Massachusetts: Kluwer Academic Publishers, 2001. [7] Luo F L, Ye H. Positive output cascade Boost converters[J]. IEE Proceedings of Electric Power Applications, 2004, 151(5): 590-606. [8] Zhang N, Sutanto D, Muttaqi K M, et al. High- voltage-gain quadratic Boost converter with voltage multiplier[J]. IET Power Electronics, 2015, 8(12): 2511-2519. [9] 曹太强, 刘威, 郭筱瑛, 等. 双耦合电感二次型高升压增益DC-DC变换器[J]. 电工技术学报, 2015, 30(8): 104-112. Cao Taiqiang,Liu Wei, Guo Xiaoying, et al. High voltage gain DC-DC converter based on two- coupled-inductor[J]. Transactions of China Electro- technical Society, 2015, 30(8): 104-112. [10] 吴红飞, 古俊银, 张君君, 等. 高效率高增益 Boost-Flyback 直流变换器[J]. 中国电机工程学报, 2011, 31(24): 40-45. Wu Hongfei, Gu Junyin, Zhang Junjun, et al. High efficiency high step-up Boost-Flyback DC/DC converter[J]. Proceedings of the CSEE, 2011, 31(24): 40-45. [11] Tseng K C, Liang T J. Novel high-efficiency step-up converter[J]. IEE Proceedings of Electric Power Applications, 2004, 151(2): 182-190. [12] 张阳, 罗全明, 高伟, 等. 一种高增益软开关Boost-Forward变换器[J]. 电工技术学报, 2015, 30(7): 80-87. Zhang Yang, Luo Quanming, Gao Wei, et al. A high gain soft-switching Boost-forward converter[J]. Transitions of China Electrotechnical Society, 2015, 30(7): 80-87. [13] 周翔, 许建平, 陈章勇. 高升压增益软开关DC-DC变换器[J]. 电工技术学报, 2016, 31(14): 156-164. Zhou Xiang, Xu Jianping, Chen Zhangyong, et al. Soft-switched DC-DC converter with high voltage gain[J]. Transactions of China Electrotechnical Society, 2016, 31(14): 156-164. [14] 陈章勇, 许建平, 吴建雪, 等. 基于LC吸收电路的耦合电感倍压单元高升压增益Boost变换器[J]. 电工技术学报, 2016, 31(2): 78-85. Chen Zhangyong, Xu Jianping, Wu Jianxue, et al. High voltage gain Boost converter based on coupled- inductor voltage-doubler cell and LC snubber circuit[J]. Transactions of China Electrotechnical Society, 2016, 31(2): 78-85. [15] 陆治国, 郑路遥, 马召鼎, 等. 带开关电容网络的交错并联高增益Boost变换器[J]. 电工技术学报, 2012, 27(11): 153-159. Lu Zhiguo, Zheng Luyao, Ma Zhaoding, et al. Interleaved high gain Boost converter with switched capacitor network[J]. Transactions of China Electro- technical Society, 2012, 27(11): 153-159. [16] 陆杨军, 邢岩, 吴红飞, 等. 宽电压范围双移相控制多倍压高增益软开关隔离升降压变换器[J]. 电工技术学报, 2016, 31(13): 10-17. Lu Yangjun, Xing Yan, Wu Hongfei, et al. Dual- phase-shift-controlled high step-up soft-switching isolated Buck/Boost converter for wide-voltage-range applications[J]. Transactions of China Electro- technical Society, 2016, 31(13): 10-17. [17] 罗全明, 闫欢, 孙明坤, 等. 基于拓扑组合的高增益Boost变换器[J]. 电工技术学报, 2012, 27(6): 96-102. Luo Quanming, Yan Huan, Sun Mingkun, et al. High step-up Boost converter based on topology combination[J]. Transactions of China Electro- technical Society, 2012, 27(6): 96-102. [18] 汪洋, 罗全明, 支树播, 等. 一种交错并联高升压BOOST变换器[J]. 电力系统保护与控制, 2013, 41(5): 133-139. Wang Yang, Luo Quanming, Zhi Shubo, et al. A new interleaved high step-up Boost converter[J]. Power System Protection and Control, 2013, 41(5): 133-139. [19] Feng X, Liu J, Lee F C. Impedance specifications for stable DC distributed power systems[J]. IEEE Transa- ctions on Power Electronics, 2002, 17(2): 157-162. [20] Chen S M, Liang T J, Yang L S, et al. 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. [21] Changchien S K, Liang T J, Chen J F, et al. Novel high step-up DC-DC converter for fuel cell energy conversion system[J]. IEEE Transactions on Indu- strial Electronics, 2010, 57(6): 2007-2017. [22] Tseng K C, Chen J Z, Lin J T, et al. High step-up interleaved forward-flyback Boost converter with three-winding coupled inductors[J]. IEEE Transa- ctions on Power Electronics, 2015, 30(9): 4696-4703. [23] Tseng K C, Lin J T, Huang C C. High step-up converter with three-winding coupled inductor for fuel cell energy source applications[J]. IEEE Transa- ctions on Power Electronics, 2015, 30(2): 574-581.
2017, Vol. 32 
