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

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太阳能学报 ›› 2025, Vol. 46 ›› Issue (6) : 440-450. DOI: 10.19912/j.0254-0096.tynxb.2024-0210

高降压比LLC谐振变换器

艾建, 沈晔豪, 杨贤彬, 毕恺韬, 樊启高

作者信息 +

LLC RESONANT CONVERTER WITH HIGH VOLTAGE STEP-DOWN RATIO

Ai Jian, Shen Yehao, Yang Xianbin, Bi Kaitao, Fan Qigao

Author information +

文章历史 +

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.

导出引用

艾建, 沈晔豪, 杨贤彬, 毕恺韬, 樊启高. 高降压比LLC谐振变换器[J]. 太阳能学报. 2025, 46(6): 440-450 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0210

Ai Jian, Shen Yehao, Yang Xianbin, Bi Kaitao, Fan Qigao. LLC RESONANT CONVERTER WITH HIGH VOLTAGE STEP-DOWN RATIO[J]. Acta Energiae Solaris Sinica. 2025, 46(6): 440-450 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0210

中图分类号： TM46

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