串-串谐振式无线充电系统设计与仿真

摘要

The wireless charging system has the disadvantages of low transfer efficiency and high changing rate of output power.To solve these problems,the paper,based on Series-Series Compensated resonant topology,presents a frequency tracking control method (FTC)for electric vehicles.Based on the analysis of the factors influencing output power and transmission efficiency,the coupling coils were designed and the equivalent T model was built by using LTspice.The simulation result shows that the system achieves ZVS when the switching frequency is higher than the resonant frequency with the switching loss reduced and the system transmission efficiency increased,and that the transmission efficiency is up to 92% when the system output power is 1kW with the resonant frequency being 50kHz and switching frequency being 51kHz.%针对无线充电传输效率低及其变化率大的问题,本文基于串联谐振补偿拓扑原理,通过分析无线充电系统输出功率与传输效率影响因素,提出应用于电动汽车的无线充电系统的频率跟踪方法,建立无线能量传输耦合线圈,利用LTspice搭建无线充电系统T模型等效电路.仿真结果表明:斩波频率大于谐振频率时,系统实现软开关技术,减小开关损耗增大系统传输效率.当谐振频率为50kHz选择斩波频率为51kHz时输出功率为1kW时传输效率达92%.