高降压比LLC谐振变换器

艾建; 沈晔豪; 杨贤彬; 毕恺韬; 樊启高

doi:doi:10.19912/j.0254-0096.tynxb.2024-0210

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高降压比LLC谐振变换器

更新时间：2025-12-02

- 高降压比LLC谐振变换器
- Vol. 46, Issue 6, Pages: 440-450(2025)
- 作者机构：
- 作者简介：
- 基金信息：
- DOI：doi:10.19912/j.0254-0096.tynxb.2024-0210
  CLC： TM46
- Published Online：07 July 2025，
  
  Published：2025
- 稿件说明：
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艾建, 沈晔豪, 杨贤彬, et al. 高降压比LLC谐振变换器[J]. 2025, 46(6): 440-450.
DOI：

艾建, 沈晔豪, 杨贤彬, et al. 高降压比LLC谐振变换器[J]. 2025, 46(6): 440-450. DOI： doi:10.19912/j.0254-0096.tynxb.2024-0210.

摘要

传统LLC谐振变换器的降压比受变压器匝比以及开关频率范围限制

且高压侧器件电压应力高

无法适用于高降压比场合。针对该问题

该文提出一种新型高降压比LLC谐振变换器

其降压比是全桥LLC谐振变换器的4倍

并具有实现软开关、输入电容电压自平衡、高压侧器件电压应力低以及控制方法简单等优点。详细阐述其工作模态及运行机理

并在开关管延时关断的条件下

分析变换器输入电容电压自平衡机理。最后

通过搭建一台2 kW的实验样机

证明该变换器具有的优点及其运行原理的正确性。

Abstract

The voltage step-down ratio of traditional LLC resonant converters is constrained by transformer turns ratio and switching frequency range

and the voltage stress of the high-voltage side components is high

making it unsuitable for applications with a high step-down ratios. This paper proposes a novel LLC resonant converter with high step-down ratio to address this issue. Its voltage step-down ratio is four times that of a full-bridge LLC resonant converter

and it boasts advantages such as soft switching

self-balancing of input capacitor voltage

low voltage stress on high-voltage side components

and simplified control method. The paper elaborates on its operational mode and operating principle

and under the condition of delayed turn-off of the switching devices

provides a detailed analysis of the self-balancing mechanism of input capacitor voltage in the converter. Finally

by constructing a 2 kW experimental prototype

the paper demonstrates the advantages of the converter and validates the correctness of its operating principles.

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references

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