T参数模型及其在S/P补偿WPT系统中的应用

T parameter model and its application in S/P compensated WPT system

T参数模型适合于级联网络的建模和分析,可以反映寄生参数和分布参数带来的影响,在高频场合或大系统建模中有良好的应用价值。本文针对T参数模型在无线电能传输(WPT)系统中的应用开展研究。首先采用T参数模型对WPT系统建模,并给出模型中各个参数的获取方法。然后基于T参数模型,推导得到WPT系统工作特性的通用表达式和系统实现最大功率传输或最高效率的负载条件。最后,搭建了测试平台,将基于T参数模型的S/P补偿WPT系统的理论分析结果与实验测试结果进行对比。测试所得的效率、功率传输曲线和最优负载与理论计算结果吻合较好,表明了T参数模型能够有效地描述WPT系统的工作特性,同时也验证了T模型参数获取方法的有效性。

T parameter model is often applied to modeling and analyzing the cascade network.It can take the influence of parasitic parameters and distributed parameters into consideration.It is of great use in high-frequency field or for the modeling of large scale system.This paper researches the application of T parameter model in wireless power transfer(WPT)system.Firstly,the T parameter model is used to model the WPT system,and the methods to obtain the parameters are given.Then,based on the T parameter model,a general expression of the operating characteristics of the WPT system is derived.The load conditions that the system achieves maximum power transmission or maximum efficiency are also given.Finally,the prototype is built,and the theoretical results of S/P compensation system based on T parameter model are compared with the experimental results of the WPT system.The experimental results of the power transmission curves,and the efficiency curves are in good agreement with the theoretical calculation based on T parameter model.It shows that the model can not only effectively describe the working characteristics of the WPT system,but also verify the effectiveness of the method to obtain the parameters.