A novel resonant reset asymmetrical dual switch forward converter (DSFC) was proposed to overcome the duty ratio limitation issue existing in DSFC, which is unsuitable for the wide input range application and improving the efficiency. Compared with the traditional DSFC, the converter maintained the advantage of lowering voltage stress on each switch, and possessed the merits with the duty ratio exceed 50% and the conventional pulse width modulation (PWM) operation capability. The soft switching transition for all switches under all conditions was achieved while no modification was made on the original transformer component and the auxiliary circuit was comparatively simple and the cost effective. Therefore, the converter can achieve lower manufacturing costs and has strong capability for high line and wide input range industrial applications. A prototype aiming at the telecom system of 200～400 V input, 48 V/5 A output, whose highest conversion efficiency was 95.3%, was built to verify the validity and applicability of the converter.
［1］ 钱照明,张军明,谢小高,等.电力电子系统集成研究进展与现状［J］.电工技术学报,2006, 21(3): 114.
QIAN Zhaoming, ZHANG Junming, XIE Xiaogao, et al. Progress in power electronic system integration［J］. Transactions of China Electrotechnical Society, 2006, 21(3): 114.
［2］ TAN F D. The forward converter: from the classic to the contemporary［C］∥ Proceeding of IEEE APEC. Dallas, Texas, USA: IEEE, 2002: 857863.
［3］ XI Youhao, JAIN P K, LIU Y F, et al. A self core reset and zero voltage switching forward converter topology［J］. IEEE Transactions on Power Electronics, 2000, 15(6): 11921203.
［4］ 石健将,何湘宁,严仰光.一种输入端自然均流/高电压增益组合式变换器研究［J］.电工技术学报, 2005, 20(3): 1418.
SHI Jianjiang, HE Xiangning, YAN Yangguang. Study on a combined converter with natural sharing inputcurrent and high voltage gain［J］. Transactions of China Electrotechnical Society, 2005, 20(3): 1418.
［5］ PETERSEN L. Advantages of using a twoswitch forward in singlestage power factor corrected power supplies［C］∥ Proceeding of IEEE INTELEC. Phoenix, Arizona, USA: IEEE, 2000: 325331.
［6］ XU J, CAO X, LUO Q. An improved twotransistor forward converter［C］∥ Proceeding of IEEE PEDS. Hong Kong: IEEE, 1999: 225228.
［7］ SPIAZZI G. A highquality rectifier based on the forward topology with secondaryside resonant reset［J］. IEEE Transactions on Power Electronics, 2003, 18(3): 725732.
［8］ GU Y, HANG L, CHEN S, et al. Research on control type soft switching converters［C］∥ Proceeding of IEEE PESC. Aachen, Germany: IEEE, 2004: 14701475.
［9］ 姚志垒,肖岚.一族零电压开关直流变压器［J］.电工技术学报,2006, 21(11): 8790,105.
YAO Zhilei, XIAO Lan. A family of zerovoltageswitching DC/DC transformers ［J］. Transactions of China Electrotechnical Society, 2006, 21(11): 8790,105.
［10］ COBOS J A, GARCIA O, SEBASTIAN A, et al. Resonant reset forward topologies for low output voltage on board converters［C］∥ Proceeding of IEEE APEC. Orlando, Florida: IEEE, 1994: 703708.
［11］ XI Youhao, JAIN P K. A forward converter topology employing a resonant auxiliary circuit to achieve soft switching and power transformer resetting［J］. IEEE Transactions on Industrial Electronics, 2003, 50(1): 132140.
［12］ HAMADA S, MII T, HIRAKI E, et al. Saturable reactor and lossless capacitorassisted softswitching asymmetrical PWM DCDC converter with forwardflyback transformer link［C］∥ Proceeding of IEEE PESC. Baveno, Italy: IEEE, 1996: 100105.
［13］ 董文辉,金天均,陈辉明.后级调整技术在多路输出反激电路中的运用［J］.电工技术学报,2005, 20(12): 6468, 75.
DONG Wenhui, JIN Tianjun, CHEN Huiming. Secondary side post regulation application in multiple output flyback converter［J］. Transactions of China Electrotechnical Society, 2005, 20(12): 6468, 75.
［14］ 陈乾宏,阮新波,严仰光.开关电源中磁集成技术及其应用［J］.电工技术学报,2004, 19(3): 18.
CHEN Qianhong, RUAN Xinbo, YAN Yangguang. The application of the magneticintegration techniques in switching power supply［J］. Transactions of China Electrotechnical Society, 2004, 19(3): 18.
