基于SiC的高频双边LCC无线能量传输装置的研究与实现

Research and Implementation of High Frequency Double-sided LCC Wireless Power Transmission Device Based on SiC

针对电磁耦合式无线能量传输(wireless power transfer,WPT)系统的工作频率低、功率密度小和传输距离近等问题,采用双LCC拓扑结构,通过叠加原理得到了系统输出电流的表达式。通过T型等效电路得到了双LCC型的8阶系统数学模型。应用幅频特性分析方法,实现了系统恒压、恒流工作频率的选择。采用LCC型参数的配置方法,并基于碳化硅(SiC)器件搭建的高频逆变器。实现了一台工作频率≥300 kHz、传输功率≥500 W、最大传输效率≥90%及传输距离≥100 mm的强抗偏移的特性WPT实验样机。重点研究了NP0电容对保障系统稳定的工作在高频状态下的作用。通过仿真分析与实物验证,对比了SS型与双LCC型存在线路损耗时的传输特性,得到了动态负载及原副两线圈耦合系数不确定情况下对系统传输影响的规律。

To solve the problems such as the low operating frequency,low power density and short transmission distance of the electrmagnetically coupled Wireless Power Transfer(WPT)system,we employed the double-sided LCC topology to obtain an expression of the system output current through the superposition principle.The T-type equivalent circuit was adopted to obtain a mathematical model of the 8 th-order system of the double-sided LCC type.The amplitude-frequency characteristic analysis method was applied to realize the selection of the system constant voltage and constant current operating frequency.The LCC-type parameter configuration method was adopted,and a high frequency inverter based on device of silicon carbide(SiC)was built.Furthermore,WPT experimental prototype with strong anti-offset characteristics of working frequency≥300 kHz,transmission power≥500 W,maximum transmission efficiency≥90%and transmission distance≥100 mm has been prepared.The effect of NP0 capacitor on the stability of the system is discussed in the high frequency state.Through the simulation analysis and physical verification,the transmission characteristics of the SS type and the double-sided LCC type with line loss are compared,and the influence of the dynamic load and the coupling coefficient of the original two pairs of coils on the system transmission is obtained.