A Dual Half-bridge Three-channel Ultra-wide Gain LLC Resonant Converter and Its Control Strategy

LIN Hao; LIN Guoqing; LIN Yujing

doi:10.13334/j.0258-8013.pcsee.250867

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A Dual Half-bridge Three-channel Ultra-wide Gain LLC Resonant Converter and Its Control Strategy

更新时间：2026-10-12

- A Dual Half-bridge Three-channel Ultra-wide Gain LLC Resonant Converter and Its Control Strategy
- Vol. 46, Issue 5, Pages: 2022-2032(2026)
- 作者机构：
  
  1. 福建省新能源发电与电能变换重点实验室(福州大学),福建省,福州市,350116
  2. 国网福建省电力有限公司信息通信分公司,福建省,福州市,350003
- 作者简介：
- 基金信息：
- DOI：10.13334/j.0258-8013.pcsee.250867
  CLC：
- Received：05 March 2026，
  
  Published：2026
- 稿件说明：
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LIN Hao, LIN Guoqing, LIN Yujing. A Dual Half-bridge Three-channel Ultra-wide Gain LLC Resonant Converter and Its Control Strategy[J]. 2026, 46(5): 2022-2032.
DOI：

LIN Hao, LIN Guoqing, LIN Yujing. A Dual Half-bridge Three-channel Ultra-wide Gain LLC Resonant Converter and Its Control Strategy[J]. 2026, 46(5): 2022-2032. DOI： 10.13334/j.0258-8013.pcsee.250867.

摘要

为了有效解决传统LLC谐振变换器在宽电压范围应用中，开关频率范围过宽引起环流损耗增加导致整体效率下降的矛盾，提出一种双半桥三通道拓扑结构的LLC谐振变换器。该变换器通过基于脉宽调制-脉频调制的混合控制策略构造出同步双通道模式、异步三通道桥式整流模式和异步三通道倍压整流模式3种工作子模态，并覆盖不同增益范围，从而实现超宽输出电压范围；对各模态下的工作原理、增益公式推导进行详细的分析；最后，设计并搭建一台具有15~150 V宽范围直流输出电压、2 A额定输出电流的实验样机。实验结果表明，所提变换器在多模态运行中表现出良好的稳定性与调节能力，有效验证该拓扑结构的可行性及实际有效性。

Abstract

To address the contradiction in traditional LLC resonant converters where a wide switching frequency range in wide voltage applications increases circulating current losses and leads to a decline in overall efficiency

an LLC resonant converter with a dual half-bridge three-channel topology is proposed. This converter employs a hybrid pulse width modulation-pulse frequency modulation (PWM-PFM) control strategy to establish three operating sub-modes: the synchronous dual-channel mode

the asynchronous three-channel bridge rectification mode

and the asynchronous three-channel voltage-doubler rectification mode. These sub-modes cover different gain ranges

enabling an ultra-wide output voltage range. The working principles under each mode and the derivation of gain formulas are analyzed in detail. Finally

an experimental prototype with an output voltage range of 15~150 V and a constant output current of 2 A is designed and built. Experimental results verify the feasibility and effec-tiveness of the proposed converter.

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