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Research on Optimal Selection of Decoupling Capacitors on DC-side of High-frequency Converters
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Wensi CHEN, Jinwu GONG, Xiaoming ZHA, Jialuo CHEN, Shangzhi PAN
Journal of Power Supply | 2025, 23(2) : 274 - 282
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Journal of Power Supply | 2025, 23(2): 274-282
• Passive Components and Materials •
Research on Optimal Selection of Decoupling Capacitors on DC-side of High-frequency Converters
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Wensi CHEN, Jinwu GONG, Xiaoming ZHA, Jialuo CHEN, Shangzhi PAN
Affiliations
  • School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China
Published: 2025-03-30 doi: 10.13234/j.issn.2095-2805.2025.2.274
Outline
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The switching speed and switching frequency of converters keep increasing, and higher requirements are also imposed on the DC-side decoupling capacitors. To solve the problems of overvoltage spikes and decoupling capacitor losses caused by voltage and current oscillations during the switch-off process, a transient circuit model considering the system’s stray parameters is established, and the evolution of overvoltage and decoupling capacitor current oscillation is analyzed. On this basis, a loss model considering the parasitic parameters of the main circuit and the equivalent series resistance of the decoupling capacitor is proposed. The limiting factors for the selection of decoupling capacitors in practical engineering are quantitatively analyzed, and an optimal selection method for the decoupling capacitance and loss limit condition is obtained. Finally, the proposed model and analysis method were verified by simulation and experimental results.

Switching process  /  stray parameter  /  decoupling capacitor  /  loss model
Wensi CHEN, Jinwu GONG, Xiaoming ZHA, Jialuo CHEN, Shangzhi PAN. Research on Optimal Selection of Decoupling Capacitors on DC-side of High-frequency Converters[J]. Journal of Power Supply, 2025 , 23 (2) : 274 -282 . DOI: 10.13234/j.issn.2095-2805.2025.2.274
Funding
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  • National Natural Science Foundation of China(52177191)
  • State Administration of Science, Technology and Industry for National Defense(6142217200403)
Appendix
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Year 2025 volume 23 Issue 2
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431
153
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Article Info
doi: 10.13234/j.issn.2095-2805.2025.2.274
  • Receive Date：2022-06-03
  • Online Date：2025-07-01
  • Published：2025-03-30
Article Data
Affiliations
History
  • Received：2022-06-03
  • Revised：2022-11-03
  • Accepted：2022-12-09
Funding
National Natural Science Foundation of China(52177191)
State Administration of Science, Technology and Industry for National Defense(6142217200403)
Affiliations
    School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China
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