无线电能传输非线性拓扑补偿结构研究

Research of Nonlinear Compensation Topology for Wireless Power Transmission System

无线电能传输技术以其安全、便捷等优点,在手机、电动汽车等领域受到越来越多的关注,其中的拓扑补偿结构设计是提高系统性能的关键.而补偿网络的研究多年来均采用线性理论和线性分析方法,在设备的安全性、鲁棒性、偏移容忍度等方面不能令人满意。针对上述问题,提出一种非线性拓扑补偿结构,建立了基于T参数矩阵的电路模型;使用有限元分析软件对其进行场路耦合瞬态仿真,解决了由于非线性模型难以得到解析解的难题,仿真计算出了磁性材料在非线性饱和状态条件下,系统的输出电压随负载和耦合系数变化的情况;综合理论分析与仿真实验结果,设计出了带有非线性补偿拓扑结构的无线电能传输实验系统。实验结果表明:该非线性拓扑补偿网络在输出负载剧烈变化、耦合系数k剧烈变化的情况下,输出电压基本稳定,其潜在性能表现有望超过现有线性拓扑结构。

Wireless power transmission system(WPT)has gained more and more attention by its safe,environmentally inert and convenient.Among them,the design of compensation topology is the key factor to improve the performance of the system.Tra⁃ditional research of compensation topology is based on linear theory and linear analyze,which is still not satisfactory in terms of device safety,robustness and mutual inductance tolerance.In view of above problems,an innovative nonlinear compensation topol⁃ogy was proposed and circuit model based on T-parameter matrix was established.Because of the difficulties to obtain analytic so⁃lutions,the coupled field⁃circuit transient simulation based on finite element method(FEM)was used.The sensitive of output volt⁃age was calculated under the condition of variation load and coupling coefficient.According to the result of theoretical analysis and simulation computation,a set of WPT system was designed with nonlinear saturated inductor structure.The physical experiment re⁃sults show that the output voltages are relative stable even in the situation of dramatic change of load resistance and coupling coef⁃ficient.The potential performance of nonlinear topology is promising far more to exceed the existing linear topology.