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Prediction and Suppression of Common-mode EMI Noise for Push-pull Converter
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Yuezhe WU1, Chengjun ZHENG2, Zikai DU2, Kuian MA2, Xiaoyong REN1, Qianhong CHEN1
Journal of Power Supply | 2025, 23(5) : 316 - 323
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Journal of Power Supply | 2025, 23(5): 316-323
• EMI/EMC •
Prediction and Suppression of Common-mode EMI Noise for Push-pull Converter
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Yuezhe WU1, Chengjun ZHENG2, Zikai DU2, Kuian MA2, Xiaoyong REN1, Qianhong CHEN1
Affiliations
  • 1.College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
  • 2.Xi'an Institute of Space Radio Technology, Xi'an 710100, China
Published: 2025-09-30 doi: 10.13234/j.issn.2095-2805.2025.5.316
Outline
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As a typical isolation topology, the push-pull converter has been widely applied in high-reliability scenarios because the transformer is bidirectionally magnetized and the input does not have the risk of bridge arm straight through. With an increase in the converter's operating frequency, the influence of common-mode interference becomes obvious. Therefore, the common-mode noise modeling analysis of the converter has important theoretical and application value for its electromagnetic compatibility optimization design. For a four-winding transformer with a central tap on both the primary and secondary sides, its two-capacitance parasitic parameter model is established in this paper. On this basis, a common-mode noise model in the frequency domain of the push-pull converter is established. Through the analysis of the common-mode noise source and the conduction path of common-mode noise, the prediction of common-mode noise is realized. To enhance the practicability of the model, the extraction method for parasitic capacitance parameters of the transformer is discussed for the simplified transformer model, and a common-mode noise suppression method based on a balancing capacitor is proposed. The accuracy of the established common-mode noise model and the effectiveness of the common-mode noise suppression method were verified by experimental results.

Push-pull converter  /  common-mode noise  /  transformer model  /  common-mode noise suppression
吴岳哲, 郑成君, 杜子凯, 马奎安, 任小永, 陈乾宏. 推挽变换器共模EMI噪声的预测与抑制. 电源学报, 2025 , 23 (5) : 316 -323 . DOI: 10.13234/j.issn.2095-2805.2025.5.316
Yuezhe WU, Chengjun ZHENG, Zikai DU, Kuian MA, Xiaoyong REN, Qianhong CHEN. Prediction and Suppression of Common-mode EMI Noise for Push-pull Converter[J]. Journal of Power Supply, 2025 , 23 (5) : 316 -323 . DOI: 10.13234/j.issn.2095-2805.2025.5.316
Funding
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  • National Natural Science Foundation of China(52177181)
Appendix
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Year 2025 volume 23 Issue 5
49
9
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Article Info
doi: 10.13234/j.issn.2095-2805.2025.5.316
  • Receive Date：2023-02-02
  • Online Date：2026-10-26
  • Published：2025-09-30
Article Data
Affiliations
History
  • Received：2023-02-02
  • Revised：2023-04-18
  • Accepted：2023-05-20
Funding
National Natural Science Foundation of China(52177181)
Affiliations
    1.College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
    2.Xi'an Institute of Space Radio Technology, Xi'an 710100, China
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