电动汽车直流充电系统LLC谐振变换器软开关电压边界分析

doi:10.19595/j.cnki.1000-6753.tces.211292

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摘要 LLC谐振变换器以其优异的性能被广泛应用于电动汽车直流充电领域。针对电动汽车宽输出电压范围、高转换效率的充电需求,该文对直流充电模块后级全桥LLC谐振变换器软开关运行的输出电压边界进行了分析。零电压开通（ZVS）上边界处,变压器励磁电感参与谐振,其二次侧等效峰值电压与负载电压相等,整流二极管临界导通;ZVS下边界处,谐振电流与谐振腔的输入电压同时过零,LLC谐振变换器运行于临界感性区间。该文利用时域分析法详细分析了变换器ZVS上下边界处的工作状态,计算出变换器软开关运行所允许的输出电压范围,揭示了变换器的软开关特性与工作频率、谐振参数之间的关系,为变换器的参数设计和变频控制提供了理论指导。最后,通过仿真和实验对理论分析进行了验证。

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关键词 ： LLC谐振变换器, 软开关运行, 输出电压边界, 零电压开通（ZVS）, 电动汽车

Abstract：LLC resonant converter has been widely used in the field of DC charging for electric vehicles due to its excellent performance. Aiming at the charging requirements of electric vehicles with wide output voltage range and high efficiency, the output voltage boundary of the full bridge LLC resonant converter in DC charging module was analyzed in this paper. At the upper boundary of (zero voltage switching, ZVS), the magnetizing inductance of the transformer resonates, whose equivalent peak voltage of the secondary side is equal to the load voltage, and the rectifier diode conducts critically. And at the lower boundary of ZVS, the resonant current and the input voltage of the resonator cross zero at the same time, and the converter runs in the critical inductive region. In this paper, the working state at the ZVS upper and lower boundaries of the converter was analyzed in detail by the time-domain analysis method. The output voltage range of the converter operated in the soft switching state was calculated, and the relationship between the soft switching characteristics of the converter and the working frequency and resonance parameters was revealed, which could provide guidance for parameter design and frequency conversion control of the converter. Finally, the analytical method was verified by simulation and experiment platform.

Key words： LLC resonant converter soft switch operation output voltage boundary zero voltage switching (ZVS) electric vehicles

收稿日期: 2021-08-15

PACS:

TM46

基金资助:湖南省重点研发计划项目（2018GK2031）、汽车车身先进设计与制造国家重点实验室自主研究项目（71965005）、湖南省高层次人才聚集工程（项目编号2019RS1016）、国家111 创新引智项目（B17016）和长沙市优秀创新青年项目（KQ2009037）资助

通讯作者: 李勇男,1982年生,教授,博士生导师,主要研究方向为能源电力系统稳定性分析与控制、电能变换系统与装备、电能质量分析与控制等。E-mail：yongli@hnu.edu.cn

作者简介: 丁超男,1996年生,硕士研究生,主要研究方向为LLC谐振变换器拓扑及其控制策略。E-mail：dingchao@hnu.edu.cn

引用本文:

丁超, 李勇, 姜利, 万江湖, 刘芳. 电动汽车直流充电系统LLC谐振变换器软开关电压边界分析[J]. 电工技术学报, 2022, 37(1): 3-11. Ding Chao, Li Yong, Jiang Li, Wan Jianghu, Liu Fang. Analysis of Soft Switching Voltage Boundary of LLC Resonant Converter for EV DC Charging System. Transactions of China Electrotechnical Society, 2022, 37(1): 3-11.

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