Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Transformer balancing winding technology with effective shielding for suppressing common mode noise in flyback converters

  • Wenxiang He (Guangxi Key Laboratory of Power System Optimization and Energy Technology, Guangxi University) ;
  • Fannie Kong (Guangxi Key Laboratory of Power System Optimization and Energy Technology, Guangxi University) ;
  • Zhenmin Wang (School of Mechanical and Automotive Engineering, South China University of Technology) ;
  • Yanming Chen (Guangxi Key Laboratory of Power System Optimization and Energy Technology, Guangxi University)
  • Received : 2023.06.30
  • Accepted : 2024.03.15
  • Published : 2024.08.20
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Abstract

The main methods for suppressing the common mode (CM) noise in flyback converters include adding a shielding layer and adding a balancing winding. To combine the advantages of both methods, a balancing winding with a shielding effect is proposed to suppress CM noise. First, the CM noise transmission path of a flyback converter is analyzed, and an equivalent model of CM noise is established. Then, combined with the CM noise characteristics of the flyback converter, the design criteria for the shielding-balancing winding are given. Finally, experiments are conducted on a flyback converter prototype. The CM noise spectra of four transformer structures (without a shielding layer, with a traditional copper foil shielding layer added, with a balancing winding and with the proposed shielding-balancing winding) are compared. The results show that the CM noise of the flyback converter can be effectively suppressed by adding the shielding-balancing winding proposed in this paper. In addition, the effectiveness of the proposed method is verified.

Keywords

Acknowledgement

This work was supported by Guangxi Key Laboratory of Power System Optimization and Energy Technology of Guangxi University under Grant the National Natural Science Foundation of Guangxi (2021GXNSFAA220136).

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