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Research Progress and Technical Analysis of Coreless DC Transformers
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Li LAI1, Bo ZHANG  Fellow, CPSS1, Hong LI  Senior Member, CPSS2, Jingyang LIN1, Lun YANG1
Journal of Power Supply | 2026, 24(4) : 340 - 352
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Journal of Power Supply | 2026, 24(4): 340-352
• Emerging Technologies in Power Supplies •
Research Progress and Technical Analysis of Coreless DC Transformers
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Li LAI1, Bo ZHANG  Fellow, CPSS1, Hong LI  Senior Member, CPSS2, Jingyang LIN1, Lun YANG1
Affiliations
  • 1.School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China
  • 2.College of Electrical Engineering, Zhejiang University, Hangzhou 310058, China
Published: 2026-04-30 doi: 10.13234/j.issn.2095-2805.2026.4.340
Outline
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As a category of power electronic transformers, DC transformers have demonstrated excellent application prospects. However, the weight and cost of traditional magnetic-core isolation transformers directly constrain the development and applications of DC transformers. Consequently, coreless DC transformers employing lightweight and low-cost coreless isolation transformers have emerged as a new research direction. First, the characteristics of coreless transformers and their functions within DC transformers are systematically reviewed. Second, the technical configurations of coreless DC transformers are analyzed, categorizing them into linear and sinusoidal types. Final, the technical characteristics of three sinusoidal coreless DC transformer variants (i.e., self-inductance resonant, leakage inductance resonant and PT-symmetrical) are examined, and a comparative study of their performance is also conducted.

Coreless transformer  /  coreless DC transformer  /  weight and cost  /  high frequency  /  PT symmetry
赖立, 张波中国电源学会会士, 李虹中国电源学会高级会员, 林靖扬, 杨伦. 无铁心直流变压器的研究进展与技术剖析. 电源学报, 2026 , 24 (4) : 340 -352 . DOI: 10.13234/j.issn.2095-2805.2026.4.340
Li LAI, Bo ZHANG, Hong LI, Jingyang LIN, Lun YANG. Research Progress and Technical Analysis of Coreless DC Transformers[J]. Journal of Power Supply, 2026 , 24 (4) : 340 -352 . DOI: 10.13234/j.issn.2095-2805.2026.4.340
Funding
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  • Key Program of National Natural Science Foundation of China(52130705)
Appendix
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Year 2026 volume 24 Issue 4
25
3
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Article Info
doi: 10.13234/j.issn.2095-2805.2026.4.340
  • Receive Date：2025-09-05
  • Online Date：2026-10-29
  • Published：2026-04-30
Article Data
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History
  • Received：2025-09-05
  • Revised：2025-10-28
  • Accepted：2025-11-17
Funding
Key Program of National Natural Science Foundation of China(52130705)
Affiliations
    1.School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China
    2.College of Electrical Engineering, Zhejiang University, Hangzhou 310058, China
References
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
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Number of
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Percentage of
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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