Abstract：A novel PWM phase-shifted full-bridge converter with controlled auxiliary circuit is proposed featuring zero-voltage-switching (ZVS) of active switches over a wide range of input voltage and output load. In contrast to conventional techniques, the current through the auxiliary inductor of the proposed converter is controlled by the load current. Therefore, the ZVS operation over the wide conversion range is achieved without significantly increasing full-load conduction loss. The principle of the operation is described and the consideration in the design of auxiliary circuit are discussed. Performance of the proposed converter is verified with experiment results on 1kW, 100 kHz full-bridge converter.
[1] www.energystar.gov [2] Dalal D B. A 500 kHz multi-output converter with zero voltage switching[C]. Proceedings of IEEE APEC, 1990: 265-274. [3] Redl R, Sokal N O, Balogh L. A novel soft-switching full-bridge dc/dc converter: analysis, design considerations, and experimental results at 1.5 kW, 100 kHz[C]. Proceedings of IEEE PESC, 1990: 162-172. [4] Sabate J A, Vlatkovic V, Ridley R B, et al. High-voltage, high-power, ZVS, full-bridge PWM converter employing an active snubber[C]. Proceed- ings of IEEE APEC, 1991: 158-163. [5] Chen W, Lee F C, Jovanovic M M. A comparative study of a class of full bridge zero-voltage-switched PWM converters[C]. Proceedings of IEEE APEC, 1995: 893- 899. [6] Stabate J A, Vlatkovic V, Ridley R B, et al. Design considerations for high-voltage high-power full- bridge zero-voltage-switching PWM converter[J]. IEEE Trans. on Power Electron., 1990, 16(2): 275- 284. [7] Watson R, Lee F C. Analysis, design, and experimental results of a 1kW ZVS-FB-PWM converter employing magamp secondary side control[C]. Proceedings of Virginia Power Electronics Center Seminar, 1993: 207-212. [8] Cho J G, stabate J A, Lee F C. Novel full-bridge zero-voltage-transition PWM dc/dc converter for high power application[C]. Proceedings of IEEE APEC, 1994: 166- 172. [9] 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 Trans. on Power Electron., 2002, 17(5): 649-657. [10] Jang Y, Jovanovic M M. A new family of full-bridge ZVS converters[J]. IEEE Trans. on Power Electron., 2004, 19(3): 701-707. [11] Jang Y, Jovanovic M M. A new PWM ZVS full-bridge converter[J]. IEEE Trans. on Power Electron., 2007, 22(3): 987-994. [12] Borage M, Tiwari S, Kotaiah S. A passive auxiliary circuit achieves zero-voltage-switching in full-bridge converter over entire conversion range[J]. IEEE Trans. on Power Electron. Letter, 2005, 3(4): 141-143.
2010, Vol. 25 
