SP-type Coreless Flyback Converter With Transient PT Symmetric Characteristics

WEI Zizheng; ZHANG Bo

doi:10.13334/j.0258-8013.pcsee.250292

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SP-type Coreless Flyback Converter With Transient PT Symmetric Characteristics

更新时间：2026-10-12

- SP-type Coreless Flyback Converter With Transient PT Symmetric Characteristics
- Vol. 46, Issue 9, Pages: 3907-3916(2026)
- 作者机构：
  
  华南理工大学电力学院,广东省,广州市,510640
- 作者简介：
- 基金信息：
- DOI：10.13334/j.0258-8013.pcsee.250292
  CLC：
- Received：05 May 2026，
  
  Published：2026
- 稿件说明：
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WEI Zizheng, ZHANG Bo. SP-type Coreless Flyback Converter With Transient PT Symmetric Characteristics[J]. 2026, 46(9): 3907-3916.
DOI：

WEI Zizheng, ZHANG Bo. SP-type Coreless Flyback Converter With Transient PT Symmetric Characteristics[J]. 2026, 46(9): 3907-3916. DOI： 10.13334/j.0258-8013.pcsee.250292.

摘要

该文提出一种基于暂态宇称时间(parity-time，PT)对称原理的串联-并联(series-parallel，SP)型无铁芯反激变换器。首先，分析SP型拓扑的暂态PT对称特性，揭示其在无激励源条件下的频率分裂与衰减率分裂机制；进而利用耦合模方程和电路方程特征根分析，阐明其负载电阻对能量传输模式的动态调控作用；然后，将SP型拓扑暂态PT对称特性应用于反激变换器，实现了无铁芯反激变换器。实验结果表明，暂态PT对称SP型无铁芯反激变换器效率超过97%，输出功率为12.5 W，整机效率达89%，隔离变压器频率为140 kHz，开关频率为40 kHz，仅为变压器频率的28.6%，证明了反激变换器可以采用无铁芯变压器结构，且开关器件工作频率远低于隔离变压器频率，具有较高的性价比，提高了可靠性。

Abstract

This paper proposes an SP-type coreless flyback converter based on the transient PT-symmetric principle. Initially

the transient PT-symmetric characteristics of the SP-type topology are analyzed

revealing its frequency splitting and decay rate splitting mechanisms under unexcited conditions. Subsequently

the dynamic regulation of energy transfer modes by load resistance is elucidated through coupled-mode equations and eigenvalue analysis of circuit equations. By applying the transient PT-symmetric properties of the SP-type topology to a flyback converter

a coreless flyback converter is realized. Experimental results demonstrate that the transient PT-symmetric SP-type coreless flyback converter achieves over 97% efficiency

12.5 W output power

and 89% overall system efficiency. With an isolation transformer frequency of 140 kHz and switching frequency of 40 kHz (only 28.6% of the transformer frequency)

this work proves the feasibility of implementing coreless transformer structures in flyback converters. The significantly reduced switching frequency relative to transformer frequency enhances both cost-effectiveness and operational reliability.

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