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Analysis of Conducted Common-mode EMI Characteristics of Single-switch Forward Converter
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Changchuan PENG, Wei CHEN, Subin LIN
Journal of Power Supply | 2025, 23(2) : 298 - 306
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Journal of Power Supply | 2025, 23(2): 298-306
• EMI/EMC •
Analysis of Conducted Common-mode EMI Characteristics of Single-switch Forward Converter
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Changchuan PENG, Wei CHEN, Subin LIN
Affiliations
  • College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
Published: 2025-03-30 doi: 10.13234/j.issn.2095-2805.2025.2.298
Outline
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To study the conducted common-mode (CM) electromagnetic interference (EMI) characteristics of a single-switch forward converter and reduce its CM noise, the analysis of the transmission mechanism of conducted CM noise in the single-switch forward converter is necessary. On this basis, a CM noise transmission path model is established, and a calculation method is proposed to determine the specific external capacitance to reduce the CM noise. In addition, aimed at the defects of the traditional calculation model of induced charge on the secondary side, an improved calculation model is put forward, and simulation results show that the accuracy of the improved model is higher under ideal conditions. Afterwards, the balanced winding method was used to reduce the CM noise flowing through the transformer, and a prototype of single-switch forward converter power supply was used for experimental verification. Results show that the method of calculating the external capacitance was effective, and the accuracy of charge calculated by the improved calculation model was higher when the windings were close or when the number of turns per unit length was relatively large.

Electromagnetic interference (EMI)  /  forward converter  /  conducted common-mode (CM) EMI characteristics  /  CM noise offset
Changchuan PENG, Wei CHEN, Subin LIN. Analysis of Conducted Common-mode EMI Characteristics of Single-switch Forward Converter[J]. Journal of Power Supply, 2025 , 23 (2) : 298 -306 . DOI: 10.13234/j.issn.2095-2805.2025.2.298
Funding
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  • National Natural Science Foundation of China(51777036)
  • Natural Science Foundation of Fujian Province(2022J01565)
Appendix
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Year 2025 volume 23 Issue 2
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428
154
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Article Info
doi: 10.13234/j.issn.2095-2805.2025.2.298
  • Receive Date：2022-07-10
  • Online Date：2025-07-01
  • Published：2025-03-30
Article Data
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History
  • Received：2022-07-10
  • Revised：2022-08-10
  • Accepted：2022-09-06
Funding
National Natural Science Foundation of China(51777036)
Natural Science Foundation of Fujian Province(2022J01565)
Affiliations
    College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
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