A High Step-Up Isolated Soft-Switching DC-DC Converter with Pulse Frequency Modulation
Zhang Zhiguo1,2, Liu Junliang2, Guo Qiang1, Chen Yan1
1. Energy Internet Engineering Research Center of Chongqing City Chongqing University of Technology Chongqing 400054 China; 2. College of Automation Chongqing University of Posts and Telecommunications Chongqing 400065 China
Abstract：A high step-up isolated soft-switching DC/DC converter with pulse frequency modulation (PFM) was presented in this paper. The converter integrates a flyback converter with active clamp and similar voltage multiplier cells, and all the transistors have soft-switching. The structure of this proposed converter is simple and easy to achieve high voltage gain. At the same time, compared with the pulse width modulation (PWM) mode, the control mode of PFM modulation further reduces the power tube on the current stresses, which helps to improve the converter’s efficiency. The operation principles and characteristics of the proposed converter were analyzed in detail, and the two control strategies were compared. Finally, a 160W, 45V/380V laboratory prototype circuit was implemented to verify the effectiveness and accuracy of the theoretical analysis.
[1] Rangarajan S S, Collins E R, Fox J C, et al.A survey on global PV interconnection standards[C]//Power and Energy Conference at Illinois (PECI), Champaign, IL, USA, 2017: 1-8. [2] Scholten D M, Ertugrul N, Soong W L.Micro- inverters in small scale PV systems: a review and future directions[C]//Power Engineering Conference (AUPEC), Australasian Universities, 2013: 1-6. [3] Hu Haibing, Harb S, Kutkut N, et al.Power decoupling techniques for micro-inverters in PV systems-a review[C]//Energy Conversion Congress and Exposition (ECCE), Atlanta, GA, 2010: 3235-3240. [4] 朱晓娟, 胡海涛, 陶海东, 等. 光伏并网系统的谐波不稳定产生机理及影响规律[J]. 电工技术学报, 2017, 32(10): 33-41. Zhu Xiaojuan, Hu Haitao, Tao Haidong, et al.The mechanism and influence of harmonic instability for photovoltaic grid-connected system[J]. Transactions of China Electrotechnical Society, 2017, 32(10): 33-41. [5] 姚源, 向鑫, 李武华, 等. 副边移相控制的宽范围升压DC/DC变流器[J]. 中国电机工程学报, 2013, 33(24): 66-73. Yao Yuan, Xiang Xin, Li Wuhua, et al.Secondary side phase-shift controlled converters for Wide voltage range applications[J]. Transactions of China Electrotechnical Society, 2013, 33(24): 66-73. [6] 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. [7] 罗全明, 闫欢, 支树播, 等. 一种交错控制高增益ZCT Boost变换器[J]. 中国电机工程学报, 2013, 33(12): 18-23. Luo Quanming, Yan Huan, Zhi Shubo, et al.An interleaved high step-up zero-current-transition Boost converter[J]. Proceedings of the CSEE, 2013, 33(12): 18-23. [8] Wu T F, Lai Yusheng, Hung J C, 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. [9] Vinnikov D, Roasto I, Strzelecki R, et al.Step-up DC/DC converters with cascaded quasi-z-source network[J]. IEEE Transactions on Industrial Electronics, 2012, 59(10): 3727-3736. [10] Zhao Jing, Han Yunlong, He Xiangning, et al.Multilevel circuit topologies based on the switched- capacitor converter and diode-clamped converter[J]. IEEE Transactions on Power Electronics, 2011, 26(8): 2127-2136. [11] Qian Wei, Cao Dong, Cintron-Rivera J G, et al. A switched-capacitor DC-DC converter with high voltage gain and reduced component rating and count[J]. IEEE Transactions on Industry Applications, 2012, 48(4): 1397-1406. [12] Lu Yangjun, Wu Hongfei, Sun Kai, et al.A family of isolated Buck-Boost converters based on semiactive rectifiers for high-output voltage applications[J]. IEEE Transactions on Power Electronics, 2016, 31(9): 6327-6340. [13] Alcazar Y J A, de Souza Oliveira D, Tofoli F L, et al. DC-DC nonisolated Boost converter based on the three-state switching cell and voltage multiplier cells[J]. IEEE Transactions on Industrial Electronics, 2013, 60(10): 4438-4449. [14] 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. [15] Ahmed M E S, Orabi M, AbdelRahim O M. Two- stage micro-grid inverter with high-voltage gain for photovoltaic applications[J]. IET Power Electronics, 2013, 6(9): 1812-1821. [16] Zhang Zhiguo, Zhou Lin.Analysis and design of isolated flyback voltage-multiplier converter for low-voltage input and high-voltage output applications[J]. IET Power Electronics, 2013, 6(6): 1100-1110. [17] Delshad M, Farzanehfard H.High step-up zero- voltage switching current-fed isolated pulse width modulation DC-DC converter[J]. IET Power Elec- tronics, 2011, 4(3): 316-322. [18] LaBella T, York B, Hutchens C, et al. Dead time optimization through loss analysis of an active-clamp flyback converter utilizing GaN devices[C]//Energy Conversion Congress and Exposition (ECCE), Raleigh, NC, 2012: 3882-3889. [19] Spiazzi G, Mattavelli P, Costabeber A.High step-up ratio flyback converter with active clamp and voltage multiplier[J]. IEEE Transactions on Power Elec- tronics, 2011, 26(11): 3205-3214.
2019, Vol. 34 
