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ZTE Communications ›› 2023, Vol. 21 ›› Issue (3): 105-116.DOI: 10.12142/ZTECOM.202303014

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  • 收稿日期:2022-11-21 出版日期:2023-09-21 发布日期:2023-09-21

Simulation and Modeling of Common Mode EMI Noise in Planar Transformers

LI Wei1(), JI Jingkang1, LIU Yuanlong1, SUN Jiawei2, LIN Subin2   

  1. 1.ZTE Corporation, Shenzhen 518057, China
    2.Fuzhou University, Fuzhou 350108, China
  • Received:2022-11-21 Online:2023-09-21 Published:2023-09-21
  • About author:LI Wei (li.wei27@zte.com.cn) received his MS degree in mechatronic engineering from Southeast University, China in 2017. Currently he is working as an EMC engineer in ZTE Corporation. His research interests include switching power supply of EMC and lightning protection.|JI Jingkang received his MS degree in mechatronic engineering from Southeast University, China in 2020. He currently works as an EMC engineer in ZTE Corporation. His research interests include switching power supply of EMC and reverberation chambers.|LIU Yuanlong received his MS degree from Harbin Institute of Technology, China. Currently he is working as an EMC engineer in ZTE Corporation. His research interests include lightning protection, switching power supply of EMC, and engineering safety.|SUN Jiawei received his BE degree in electrical engineering and automation and ME degree in power electronics and power transmission both from Fuzhou University, China in 2018 and 2022, respectively. His research interest focuses on power electronics high frequency magnetic technology.|LIN Subin received his doctor’s degree from Fuzhou University, China. He currently works as an associate professor with the School of Electrical Automation, Fuzhou University. He has been engaged in the theoretical research and technical development of power electronic magnetic components for a long time. His main research direction is power electronic electromagnetic component technology, electromagnetic compatibility analysis and diagnosis.

Abstract:

The transformer is the key circuit component of the common-mode noise current when an isolated converter is working. The high-frequency characteristics of the transformer have an important influence on the common-mode noise of the converter. Traditionally, the measurement method is used for transformer modeling, and a single lumped device is used to establish the transformer model, which cannot be predicted in the transformer design stage. Based on the transformer common-mode noise transmission mechanism, this paper derives the transformer common-mode equivalent capacitance under ideal conditions. According to the principle of experimental measurement of the network analyzer, the electromagnetic field finite element simulation software three-dimensional (3D) modeling and simulation method is used to obtain the two-port parameters of the transformer, extract the high-frequency parameters of the transformer, and establish its electromagnetic compatibility equivalent circuit model. Finally, an experimental prototype is used to verify the correctness of the model by comparing the experimental measurement results with the simulation prediction results.

Key words: planar transformer, electromagnetic compatibility, common-mode noise, simulation, modeling