双频段无线电能传输线圈的宽频建模

摘要

In order to study the characteristic at the two resonant frequencies of Dual-band wireless power trans-fer (WPT) system via magnetic resonant coupling(MRC),a wide-band model of the dual-band WPT coil was es-tablished to predict the resonant frequencies of the coil,and scattering parameter S21of the dual-band system were calculated on the basis of the model. The modeling method of the dual-band compensation circuit is based on the impedance measurements. Vector fitting (VF) is used to approximate the rational functions, and impedance syn-thesis theory is applied to build equivalent circuit of the compensation circuit. Then, the equivalent circuit of the compensation circuit is connected to the partial element equivalent circuit(PEEC) of the original single-band WPT coil. Finally,experiments platform of the dual-band system was set up,and the results show the effectiveness of the modeling method.%为了研究双频段磁耦合谐振式(MRC)无线电能传输(WPT)系统不同频段的传输性能,建立了双频段MRC-WPT线圈的宽频等效电路模型对其谐振频率进行计算和预测;并计算系统在不同频段的正向传输参数.首先测量双频补偿电路的阻抗频率特性,应用矢量匹配方法对测量所得的离散点进行有理数逼近,通过阻抗综合理论建立双频补偿电路的宽频等效模型;然后将其接入原始单频线圈的部分元等效电路构成双频段MRC-WPT线圈的宽频等效电路.最后,搭建了双频段MRC-WPT系统的实验平台.结果表明了建模方法的正确性.