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 TechnologySchool of Automation Engineering University of Electronic Science and Technology of ChinaChengdu 611731 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 60W physical prototype are built and tested. The experimental results show that the advised converter can receive lower EMI level.
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通信作者:陈强, 男,1992年生,硕士,研究方向为软开关技术.E-mail: 18200271099@163.com
2019, Vol. 34 
