Chinese Journal of Electrical Engineering ›› 2018, Vol. 4 ›› Issue (3): 37-46.

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Study of the Characteristics and Suppression of EMI of Inverter with SiC and Si Devices

Zhihao Fang, Dong Jiang*, Yechi Zhang   

  1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
  • Online:2018-09-25 Published:2019-10-31
  • Contact: * , Email: jiangd@hust.edu.cn.
  • About author:Zhihao Fang received the B.S. degree from School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, China, in 2016. He is currently working toward the M.S. degree in electrical engineering at Huazhong University of Science and Technology, Wuhan, China. His research interests include silicon carbide devices based power converter design and electromagnetic interference in motor drives. Dong Jiang received B.S and M.S degrees in Electrical Engineering from Tsinghua University in 2005 and 2007. He began his PhD study in Center for Power Electronics Systems (CPES) in Virginia Tech in 2007 and was transferred to University of Tennessee with his advisor in 2010. He received his PhD degree in University of Tennessee in Dec. 2011. He has been with United Technologies Research Center (UTRC) in Connecticut as a Senior Research Scientist/Engineer from Jan 2012 to July 2015. He joined Huazhong University of Science and Technology as a professor in July 2015. Dong Jiang’s major research area is power electronics and motion control, with more than 80 published/accepted journal and conference papers and 30 patents and patent applications in this area. Yechi Zhang received B.S degree in Electrical Engineering from North China Electric Power University in 2014. He is currently working toward the Ph.D. degree in electrical engineering at Huazhong University of Science and Technology, Wuhan, China. His research interests include EMI/EMC in power converters and EMI filter design

Abstract: The paper systematically studies the impacts of two major factors: device switching actions and inverter switching frequency on the whole EMI spectrum. Several powerful experimental results of electromagnetic interference(EMI) in voltage source inverter(VSI) with SiC and Si devices are provided. As far as the influence of switching actions is concerned: faster switching speed will generate higher EMI noise levels in the high frequency range, and ringing in the device switching will also make the EMI noise near the ringing frequency range worse. In the meantime, increasing of the switching frequency of the inverter will result in a higher EMI noise peak for the whole EMI spectrum. In order to suppress the EMI noise of the converter to meet standards, Random PWM(RPWM) and EMI filters are adopted. With RPWM, the EMI current can drop a few more dB than that with SVPWM, which makes the filter work better. Also, as extra attenuation can be provided, it provides the benefit of reducing the weight and volume of the inductor of the filter. Therefore, the combination of an advanced modulation strategy and EMI filter is proposed for suppressing of EMI noise in an inverter.

Key words: Motor drive, EMI, SiC, ringing, EMI filter, PWM