CJEE

Chinese Journal of Electrical Engineering ›› 2022, Vol. 8 ›› Issue (3): 37-48.doi: 10.23919/CJEE.2022.000024

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Electromagnetic Radiation Mechanism Analysis and Field Strength Prediction of an Elementary Digital Inverter with Cables*

Junping He, Xin Li, Sili Tao, Lingling Cao*, Xi Wang   

  1. Power Electronics Center, Harbin Institute of Technology, Shenzhen, Shenzhen 518055, China
  • Received:2022-07-05 Revised:2022-07-22 Accepted:2022-07-29 Online:2022-09-25 Published:2022-10-21
  • Contact: * E-mail: caolingling@hit.edu.cn
  • About author:Junping He (Senior Member, IEEE) received bachelor’s and master’s degrees from the Northern Jiaotong University, Beijing, China in 1993 and 1999, and received the Ph.D. degree from Tsinghua University, Beijing, China, in 2003, all of which are in Electrical Engineering. He engaged in near field coupling effect research as a Postdoctoral of Tsinghua University and Delta Power Electronics Center (DPEC), Shanghai, China, from 2003 to 2005. In 2005, he joined the Harbin Institute of Technology (Shenzhen), Shenzhen, China, where he is currently an Associate Professor. His research interests include electromagnetic compatibility analysis and design in power electronics, and renewable energy power generation.
    Xin Li received bachelor’s degrees in Electrical Engineering from Yanshan University, Qinhuangdao, China, in 2015, and the master’s degree from Harbin Institute of Technology (Shenzhen), Shenzhen, China, in 2018. Her research interests include electromagnetic compatibility, power electronics and its control. Now she is an Engineer of Huawei Company, Beijing, China, mainly engaged in the electromagnetic design of electronics.
    Sili Tao received bachelor’s degree from Harbin Institute of Technology, Harbin, China in 2014, and the master’s degree from Harbin Institute of Technology, Shenzhen, Shenzhen, China, in 2018, respectively, all in Electrical Engineering. Since 2018, he has been an Electrical Design Engineer at Hangzhou EV-Tech Co., Ltd., Hangzhou, China. He is mainly engaged in the development of the board charger and DC/DC converter for electric vehicle.
    Lingling Cao received bachelor’s and master’s degree from Nanjing University of Aeronautics and Astronautics, Nanjing, China, in 2008 and 2011. She received the Ph.D. degree from The Hong Kong Polytechnic University, Hong Kong, China, in 2015. She engaged in power electronics designs as a Postdoctoral in The Hong Kong Polytechnic University from 2016 to 2017. She joined the Harbin Institute of Technology (Shenzhen), Shenzhen, China, where she is currently an Associate Professor. Her research interests include wireless power transfer technology, multiport power converter design.
    Xi Wang received bachelor’s degrees in Electrical Engineering from Hefei University of Technology, Hefei, China, in 2020, and is pursuing master’s degree from Harbin Institute of Technology (Shenzhen), Shenzhen, China, now. His research interests include electromagnetic compatibility, power electronics.
  • Supported by:
    * National Natural Science Foundation of China (52077046), Guangdong Natural Science Foundation (2020A1515010913), and Shenzhen Science Technology Plan (JSGG20201201100406017).

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Abstract: In this paper, common mode (CM) and differential mode (DM) far-field radiation models of a typical digital inverter with cables are built up to predict electromagnetic field strength and analyze field characteristics. The CM current model and its analyses are based on the imbalance difference method. It is found out that the voltage between the drain and the source electrodes of upper transistor is the key equivalent source of electromagnetic interference (EMI). Far-field radiation strength of the digital inverter in free space is predicted by using the asymmetrical antenna radiation method and current loop radiation method. The accuracy of these methods is verified by the CST electromagnetic simulation results in the frequency range from 1 MHz to 400 MHz. Furthermore, the radiation models are improved by using the mirror method, which enables to include the reflection effect of the metal ground plane at the electromagnetic compatibility (EMC) test site. Both the results of measurements in a semi-anechoic chamber and the simulation results confirm the proposed electromagnetic radiation prediction method.

Key words: Far-field radiation, common mode model, prediction of electromagnetic radiation, digital inverter