Abstract：An improved full-bridge (FB) pulse-width-modulated (PWM) converter is proposed featuring zero-voltage-switching (ZVS) of all primary switches in the entire line and load range. Compared to the conventional techniques, the stored energy in the auxiliary network progressively increases as the load current decreases. The operation principle of the circuit is described and design considerations of the converter are discussed. Finally, the operation and performance of the proposed converter is verified on a 1kW (54V/20A) experimental FB PWM ZVS converter prototype operating at 100 kHz from a 300～400V DC input.
[1] Sabaté J A, Vlatkovic V, Ridley R B, et al. Design considerations for high-voltage high-power full- bridge zero-voltage-switching PWM converter[C]. IEEE Applied Power Electronics Conference, Los Angeles, California, USA, 1990. [2] 孙铁成, 李瑞, 郭建辉, 等. 带辅助网络的倍流整流式全桥ZVS三电平变换器[J]. 电工技术学报, 2008, 23(8): 74-79. Sun Tiecheng, Li Rui, Guo Jianhui, et al . Current- doubler-rectifier full-bridge ZVS three-level converter using auxiliary net[J]. Transactions of China Electrotechnical Society, 2008, 23(8): 74-79. [3] 陈延明, 王娟, 武江峰, 等. 一种改进的零电压零电流倍流整流变换器[J]. 电工技术学报, 2009, 24(12): 82-87. Chen Yanming, Wang Juan, Wu Jiangfeng, et al. An improved zero-voltage zero-current switching converter with current-doubler-rectifier[J]. Transactions of China Electrotechnical Society, 2009, 24(12): 82-87. [4] Mcgrath B P, Holmes D G, Mcgoldrick P J, et al. Design of a soft-switched 6kW battery charger for traction applications[J]. IEEE Transactions on Power Electronics, 2007, 22(4): 1136-1144. [5] Hua G, Lee F C, Jovanović M M. An improved full-bridge zero-voltage-swicthed PWM converter using a saturable inductor[J]. IEEE Transactions on Power Electronics, 1993, 8(4): 530-534. [6] 杜贵平, 黄石生. 60kW级软开关等离子喷涂高效电源研究[J]. 电工技术学报, 2005, 20(4): 94-97. Du Guiping, Huang Shisheng. Study of 60kW plasma spray power supply with soft-switching technology[J]. Transactions of China Electrotechnical Society, 2005, 20(4): 94-97. [7] Redl R, Sokal N O, Balogh L. A novel soft-switching full-bridge DC-DC converter: analysis, design considerations, at 1.5kW, 100kHz[J]. IEEE Transactions on Power Electronics, 1991, 16(3): 408-418. [8] 陈仲, 张鑫, 季飚, 等. 一种基于变压器串联和新型辅助网络的ZVS移相全桥变换器[J]. 电工技术学报, 2009, 24(12): 95-101. Chen Zhong, Zhang Xin, Ji Biao, et al. A ZVS phase-shifted full-bridge converter with series- connection of transformer and auxiliary network[J]. Transactions of China Electrotechnical Society, 2009, 24(12): 95-101. [9] Sabaté J A, Vlatkovic V, Ridley R B, et al. High- voltage, high-power, ZVS, full-bridge PWM converter employing an active snubber[C]. IEEE Applied Power Electronics Conference, Texas, USA, 1991. [10] Jain P K, Kang W, Soin H, et al. Analysis and design considerations of a load and line independent zero voltage switching full bridge DC-DC converter topology[J]. IEEE Transactions on Power Electronics, 2002, 17(5): 649-657. [11] Jang Y, Jovanović M M, Chang Y. A new ZVS-PWM full-bridge converter [J]. IEEE Transactions on Power Electronics, 2003, 18(5): 1122-1129. [12] Jang Y, Jovanović M M. A new family of full-bridge ZVS converters[J]. IEEE Transactions on Power Electronics, 2004, 19(3): 701-708. [13] Jang Y, Jovanović M M. A new PWM ZVS full-bridge converter[J]. IEEE Transactions on Power Electronics, 2007, 22(3): 987-993. [14] 石磊, 朱忠尼, 鞠志忠, 等. 一种新型能量交换式移相全桥电路[J]. 中国电机工程学报, 2007, 27(12): 112-118. Shi Lei, Zhu Nizhong, Ju Zhizhong, et al. A novel topology of energy exchanging pattern PS-FB circuit[J]. Proceedings of the CSEE, 2007, 27(12): 112-118. [15] Mason A J, Tschirhart D J, Jain P K. New ZVS phase shift modulated full-bridge converter topologies with adaptive energy storage for SOFC application[J]. IEEE Transactions on Power Electronics, 2008, 23(1): 332-342.
2012, Vol. 27 
