Research on Symmetrical Controlled Full-Bridge Resonant PWM Converter
Cao Taiqiang1,2, Gan Xue2, Zhou Chuan2, Guo Xiaoying3, Xia Yucheng4
1. Key Laboratory of Fluid and Power Machinery, Ministry of Education Xihua University Chengdu 610039 China; 2. School of Electric Information Xihua University Chengdu 610039 China; 3. School of Electronics and Information Engineering Panzhihua University Panzhihua 617000 China; 4. UOG-UESTC Joint School Chengdu 611731 China
Abstract：The traditional symmetrical controlled full bridge DC-DC converter fails to achieve soft switching. Thus, this paper proposes a full bridge resonant PWM (FB-RPWM) converter. Its operation modes and steady state characteristics are analyzed. The analysis results show that FB-RPWM converter exhibits the characteristics of DC-DC transformer (DCX), and its DC voltage conversion ratio is independent of load, switching frequency and duty ratios. The proposed FB-RPWM converter can realize zero-voltage turn-on switching (ZVS) of switches in the full load range and zero-current turn-off switching (ZCS) of the diode. Compared with the traditional phase-shift full bridge (PSFB) converter, FB-RPWM converter has reduced switch current stress and turn-off current of the main switch. It has also completely eliminated current offset of magnetizing inductor, and thus improved the efficiency of the converter. Finally, a 400V input, 50V/10A output experimental prototype is established to verify the theoretical analysis.
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2016, Vol. 31 
