半桥型LLC全碳化硅谐振充电机应用研究

Application Research on Half-bridge LLC Full Silicon Carbide Resonant Charger

基于碳化硅(SiC)半导体器件的高频特性,详细研究了LLC变换器的原理和特性。首先分析了LLC变换器的主电路结构以及发生谐振的条件,之后详细分析了LLC变换器发生谐振时,开关管的电压电流波形以及输入阻抗,通过对输入阻抗进行分析得到了LLC变换器工作在软开关工况下的条件。最后,对LLC变换器的谐振参数进行选型设计,以此搭建了全SiC LLC变换器充电机实验样机平台,并完成了相关验证性实验。

Based on the high frequency characteristics of silicon carbide(SiC)semiconductor devices,the principle and characteristics of LLC converter are studied in detail.Firstly,the structure of the main circuit of the LLC converter and the resonant condition are analyzed.Then,the voltage and current waveform of the switching tube and the input impedance are analyzed in detail when the LLC converter is resonant.Finally,the resonant parameters of the LLC converter are selected and designed,based on which the experimental prototype platform of the full SiC LLC converter charger is built and relevant verification experiments are completed.