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Zero-current Switching Medium-frequency DC-DC Converter Applied to Medium-voltage DC System
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Mingjin DING1, Wenzhen DU2, Pengfei HOU  Student Member, CPSS3, Wu CHEN  Senior Member, CPSS3
Journal of Power Supply | 2025, 23(4) : 45 - 52
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Journal of Power Supply | 2025, 23(4): 45-52
• DC-DC Converters •
Zero-current Switching Medium-frequency DC-DC Converter Applied to Medium-voltage DC System
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Mingjin DING1, Wenzhen DU2, Pengfei HOU  Student Member, CPSS3, Wu CHEN  Senior Member, CPSS3
Affiliations
  • 1.Guodian Nanjing Automation Corporation, Nanjing 210000, China
  • 2.Biotechnology Department, China Huadian Corporation, Beijing 100032, China
  • 3.School of Electrical Engineering, Southeast University, Nanjing 210096, China
Published: 2025-07-30 doi: 10.13234/j.issn.2095-2805.2025.4.45
Outline
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The DC-DC converter serves as a core component in medium-voltage DC collection systems, undertaking crucial tasks such as voltage boosting, isolation and power transmission. An innovative half-bridge zero-current soft-switching medium-frequency converter is proposed, which utilizes an auxiliary transformer and is designed through the sharing of two switching devices by two half-bridge circuits. This converter employs a mixed-frequency modulation strategy, enabling the main circuit to operate in a medium-frequency state to undertake the primary power transmission tasks. Meanwhile, the auxiliary circuit utilizes the high-frequency chopping control technology to regulate the circuit’s power and voltage. Through a reasonable parameter configuration, the medium-frequency switching devices are ensured to achieve zero-current switching across the full-load range, thereby significantly reducing the switching losses and enhancing the system’s overall efficiency. The working principle for the converter is introduced in detail, and the design method for key parameters is analyzed. Finally, a 240 V/3 000 V/7 200 W prototype was developed to verify the performance of the proposed converter.

Medium-voltage DC collection  /  DC-DC converter  /  mixed-frequency modulation  /  dual transformers  /  zero-current switching
丁明进, 杜文珍, 侯鹏飞中国电源学会学生会员, 陈武中国电源学会高级会员. 应用于中压直流系统的零电流开关中频直流变换器. 电源学报, 2025 , 23 (4) : 45 -52 . DOI: 10.13234/j.issn.2095-2805.2025.4.45
Mingjin DING, Wenzhen DU, Pengfei HOU, Wu CHEN. Zero-current Switching Medium-frequency DC-DC Converter Applied to Medium-voltage DC System[J]. Journal of Power Supply, 2025 , 23 (4) : 45 -52 . DOI: 10.13234/j.issn.2095-2805.2025.4.45
Appendix
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Year 2025 volume 23 Issue 4
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Article Info
doi: 10.13234/j.issn.2095-2805.2025.4.45
  • Receive Date：2024-08-27
  • Online Date：2026-10-26
  • Published：2025-07-30
Article Data
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History
  • Received：2024-08-27
  • Revised：2024-10-28
  • Accepted：2024-11-11
Affiliations
    1.Guodian Nanjing Automation Corporation, Nanjing 210000, China
    2.Biotechnology Department, China Huadian Corporation, Beijing 100032, China
    3.School of Electrical Engineering, Southeast University, Nanjing 210096, China
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