Generation Mechanism and Suppression of Common Mode Magnetizing Current in Magnetic Integrated Three-phase LLC Resonant Converter

JI Guosheng; WU Hongfei; YANG Fan; BAO Junyi

doi:10.13334/j.0258-8013.pcsee.241835

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Generation Mechanism and Suppression of Common Mode Magnetizing Current in Magnetic Integrated Three-phase LLC Resonant Converter

更新时间：2026-02-05

- Generation Mechanism and Suppression of Common Mode Magnetizing Current in Magnetic Integrated Three-phase LLC Resonant Converter
- Vol. 45, Issue 18, Pages: 7316-7324(2025)
- 作者机构：
  
  1. 多电飞机电气系统工信部重点实验室(南京航空航天大学),江苏省,南京市,211106
  2. 南京邮电大学自动化学院,江苏省,南京市,210046
- 作者简介：
- 基金信息：
- DOI：10.13334/j.0258-8013.pcsee.241835
  CLC：
- Published：2025
- 稿件说明：
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JI Guosheng, WU Hongfei, YANG Fan, et al. Generation Mechanism and Suppression of Common Mode Magnetizing Current in Magnetic Integrated Three-phase LLC Resonant Converter[J]. 2025, 45(18): 7316-7324.
DOI：

JI Guosheng, WU Hongfei, YANG Fan, et al. Generation Mechanism and Suppression of Common Mode Magnetizing Current in Magnetic Integrated Three-phase LLC Resonant Converter[J]. 2025, 45(18): 7316-7324. DOI： 10.13334/j.0258-8013.pcsee.241835.

摘要

采用磁集成技术能够有效减小三相LLC谐振变换器高频变压器的体积和损耗，但磁芯集成后可能会导致变压器共模激磁电流增大。文中详细分析三相LLC谐振变换器磁集成原理，阐明三相集成变压器中共模激磁电流产生机理；以增加等效三次共模激磁电感感值为原则，提出减小集成变压器三次共模激磁电流的一般方法，设计改进的三相LLC谐振变换器集成变压器磁芯结构；进一步结合仿真和实验，验证该理论分析的正确性及所设计的三相LLC谐振变换器磁集成变压器结构的有效性。

Abstract

The size and loss of the high frequency transformer in the three-phase LLC resonant converter can be effectively reduced with magnetic integration technology

but the integrated magnetic core may lead to the increase of the common mode (CM) magnetizing current of the transformer. In this paper

the principle of magnetic integration of three-phase LLC resonant converter is analyzed in detail

and the mechanism of CM magnetizing current generation in three-phase integrated transformer is clarified. Based on the principle of increasing the third CM magnetizing inductance

a general method for reducing the third CM magnetizing current of the integrated transformer is proposed

and an improved three-phase LLC resonant converter structure integrated with the transformer core is designed. Furthermore

the correctness of the theoretical analysis and the effectiveness of the designed three-phase transformer magnetic integration structure are verified by simulation and experiment.

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