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《Transactions of China Electrotechnical Society》 2019-04
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Electromagnetic Interference Analysis of Single-Ended Fly-Back Converter Based on Secondary-Resonance-Technology

Chen Qiang;Chen Zhangyong;Chen Yong;Institute for Electric Vehicle Driving System and Safety Technology School of Automation Engineering University of Electronic Science and Technology of China;  
Aiming at the problems in traditional single-ended converters, such as large change rate of voltage and current, poor electromagnetic interference(EMI) level, this paper proposes a novel converter applied secondary-resonance-technology in flyback topology. In this converter, voltage stress and current stress are decreased thanks to the effect of resonant capacitor voltage and the design of magnetic inductance. Meanwhile, the voltage stresses of rectifier diode and resonant diode are clamped at the output voltage because of the position of resonant cavity, and the resonant diode can achieve zero current switching(ZCS) for a suitable resonant period. In this paper, the noise coupling path, equivalent model and noise optimization theory of the advised converter are analyzed. The analysis results show that the common mode noise sources are reduced, and the equivalent impedance is increased because of the reasonable design of resonant cavity, which further reduces the common mode voltage. The increase in the transformer excitation inductance reduces the current ripple, thereby reducing the differential mode interference. A simulation model and a 60 W physical prototype are built and tested. The experimental results show that the advised converter can receive lower EMI level.
【Fund】: 国家自然科学基金(51607027);; 四川省科技支撑计划(2016GZ0395、2017GZ0391、2017GZ0392);; 中央高校基本科研业务费专项资金(ZYGX2016KYQD123)资助项目
【CateGory Index】: TM46
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【Citations】
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【Co-citations】
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1 WANG Qiang;CHEN Xiangxue;LIU Yansong;WANG Tianshi;LIU Xiaoqin;College of Information and Control Engineering, Liaoning Shihua University;;Resonant DC-link Soft-switching Inverter With Auxiliary Circuits in Parallel With DC Bus[J];中国电机工程学报;2015-22
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7 Zhao Jinbin;Liu Yongxiao;Qu Keqing;Shanghai University of Electric Power;;Hysteretic PWM Control Method Based on Capacitor Charging and Discharging[J];电工技术学报;2013-08
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