Research of Non-auxiliary-circuit-based Fixed-frequency Soft-switching Techniques for 2<i>N</i>-parallel Half Bridge Converters

ZHANG Peng; CUI Xiaohan; ZHANG Guoju; PEI Wei; ZHU Enze

doi:10.13334/j.0258-8013.pcsee.251200

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Research of Non-auxiliary-circuit-based Fixed-frequency Soft-switching Techniques for 2N-parallel Half Bridge Converters

更新时间：2026-10-19

- Research of Non-auxiliary-circuit-based Fixed-frequency Soft-switching Techniques for 2N-parallel Half Bridge Converters
- Vol. 46, Issue 18, Pages: 6911-6921(2026)
- 作者机构：
  
  中国科学院电工研究所，北京市海淀区,100190
- 作者简介：
- 基金信息：
- DOI：10.13334/j.0258-8013.pcsee.251200
  CLC：
- Received：16 September 2026，
  
  Published：2026
- 稿件说明：
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ZHANG Peng, CUI Xiaohan, ZHANG Guoju, et al. Research of Non-auxiliary-circuit-based Fixed-frequency Soft-switching Techniques for 2N-parallel Half Bridge Converters[J]. 2026, 46(18): 6911-6921. DOI: 10.13334/j.0258-8013.pcsee.251200.
DOI：

ZHANG Peng, CUI Xiaohan, ZHANG Guoju, et al. Research of Non-auxiliary-circuit-based Fixed-frequency Soft-switching Techniques for 2N-parallel Half Bridge Converters[J]. 2026, 46(18): 6911-6921. DOI: 10.13334/j.0258-8013.pcsee.251200. DOI：

摘要

无辅助网络软开关技术能够实现功率器件零电压开通，是实现变流器高功率密度与高效化的重要技术路线，然而传统基于变频控制的软开关技术存在开关频率变化范围宽、电流纹波大的问题。该文借助并联桥臂环流可控特性，提出一种基于移相控制的梯形电流模式软开关调制策略，并衍生推广至2N并联桥臂变流器系统。该策略通过构造一对具备环流自平衡特性的异构载波，动态更新移相角调节环流峰值，实现全调制范围内所有功率器件定频临界软开关运行。最后，搭建一台5 kVA单相6并联桥臂SiC实验样机，验证所提策略的有效性。结果表明，该策略能够有效降低功率器件开通损耗，为变流器定频高效运行提供一种可靠技术路径。

Abstract

The non-auxiliary-circuit-based soft switching technology enables zero voltage switching (ZVS) turn-on of power devices

representing a critical approach to achieve high power density and efficiency in power converters. However

conventional soft-switching techniques based on variable frequency control are subject to wide switching frequency variation ranges and significant current ripples. By leveraging the controllable circulating current characteristics of parallel bridge arms

this paper innovatively proposed a trapezoidal current mode (TZCM) soft-switching modulation strategy based on phase-shift control and extended it to 2N-parallel bridge-arm systems. By constructing one pair of self-balancing carriers with inherent self-balancing circulating current characteristics

and adjusting the peak circulating current by dynamically adjusting the phase-shift angle

the proposed method maintained fixed-frequency boundary soft-switching operation across the full modulation range. At last

experimental verification was conducted on a 5 kVA single-phase six-parallel-arm SiC prototype

thereby confirming the effectiveness of the proposed strategy. The results demonstrates that this method can effectively reduce the turn-on loss of power devices and provide a reliable technical path for the fixed-frequency and high-efficiency operation of converters.

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Research of Non-auxiliary-circuit-based Fixed-frequency Soft-switching Techniques for 2N-parallel Half Bridge Converters

DOI：10.13334/j.0258-8013.pcsee.251200

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