一种适用于超宽输出电压范围的多模式LLC谐振变换器

方炜; 史庆平; 周密; 王雷雨; 刘晓东; 刘宿城

doi:doi:10.19912/j.0254-0096.tynxb.2024-1649

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一种适用于超宽输出电压范围的多模式LLC谐振变换器

更新时间：2026-02-06

- 一种适用于超宽输出电压范围的多模式LLC谐振变换器
- Vol. 47, Issue 1, Pages: 366-376(2026)
- 作者机构：
- 作者简介：
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- DOI：doi:10.19912/j.0254-0096.tynxb.2024-1649
  CLC： TM46
- Online First：05 February 2026，
  
  Published：05 February 2026
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方炜, 史庆平, 周密, et al. 一种适用于超宽输出电压范围的多模式LLC谐振变换器[J]. 2026, 47(1): 366-376.
DOI：

方炜, 史庆平, 周密, et al. 一种适用于超宽输出电压范围的多模式LLC谐振变换器[J]. 2026, 47(1): 366-376. DOI： doi:10.19912/j.0254-0096.tynxb.2024-1649.

摘要

针对传统LLC谐振变换器在宽输出电压应用中开关频率变化范围过宽、传输效率较低等问题

提出一种适用于超宽输出电压范围的多模式LLC谐振变换器。该变换器通过控制变压器二次侧双绕组的辅助开关

实现桥式、倍压整流的拓扑重构。结合电路模态分析

讨论了电压增益及与归一化参数k、Q的关系

给出了谐振元件参数设计规则。设计了不同电压增益模式间的切换控制

搭建一台输入400 V、最大功率1.3 kW的实验样机。实验结果表明

该变换器能够提供50~430 V超宽输出电压范围

工作频率变化范围小

转换效率较高

验证了所提拓扑及控制方法的可行性和有效性。

Abstract

A multi-mode LLC resonant converter for an ultra-wide output voltage range is proposed to address the problems of an excessively wide range of switching frequency variation and low transfer efficiency of conventional LLC resonant converter for wide output voltage applications. The converter realizes the topological reconfiguration of the bridge rectifier and the voltage doubling rectifier by controlling the auxiliary switches of the dual windings on the secondary side of the transformer. Combined with the circuit modal analysis

the voltage gain and the relationship with the normalized parameters and are discussed

and the parametric design rules of the resonant elements are given. The switching control between different voltage gain modes is designed

and an experimental prototype with an input of 400 V and a maximum power of 1.3 kW is built. The experimental results show that the converter is able to provide an ultra-wide output voltage range of 50-430 V

a small range of variation in the operating frequency

and a high conversion efficiency

which verifies the feasibility and effectiveness of the proposed topology and control method.

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references

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