中国电机工程学报2024，Vol.44Issue(5)：1974-1984,中插26,12.DOI:10.13334/j.0258-8013.pcsee.223423
一种超宽电压增益双LLC谐振变换器及控制方法
An Ultrawide Voltage Gain Dual LLC Resonant Converter and Control Method
摘要
Abstract
Due to the wide switching frequency range and low overall efficiency,traditional LLC resonant converters are not suitable for wide voltage gain applications.To solve the problem,a multi-mode dual LLC resonant converter is proposed.Based on the topology reconfiguration of half-bridge and full-bridge circuits as well as full-bridge and voltage-doubler rectifiers,the converter realizes an ultrawide output voltage within a limited frequency range by four modes with different voltage gain.While the efficiency of the converter is improved,the cost is reduced by multiplexing power devices.In order to achieve smooth transitions between these modes,a pulse width modulation-pulse frequency modulation(PWM-PFM)control method is designed for the converter,which is further optimized according to the characteristics of mode switching to improve the speed.To verify the feasibility of the proposed converter and control method,a SiC-based experimental prototype with an output voltage of 60～450 V and a maximum power of 900 W is designed and tested.关键词
LLC谐振变换器/双变压器/拓扑重构/宽电压增益/模式切换Key words
LLC resonant converter/dual-transformer/topology reconfiguration/wide voltage gain/mode switching分类
信息技术与安全科学引用本文复制引用
孙鑫宇,邓宇豪,聂江霖,马兰,舒泽亮..一种超宽电压增益双LLC谐振变换器及控制方法[J].中国电机工程学报,2024,44(5):1974-1984,中插26,12.基金项目
国家重点研发计划项目(2021YFB2601500) （2021YFB2601500）
国家自然科学基金项目(52077183). National Key R&D Program of China(2021YFB2601500) （52077183）
Project Supported by National Natural Science Foundation of China(52077183). （52077183）
