多中继无线供电系统线圈-电路参数优化设计研究

Optimization Design of Coil-circuit Parameters for Multi-relay Wireless Power Transfer System

多中继无线供电系统包含线圈自感、互感、内阻、工作频率、补偿电容等众多设计参数。在满足负载功率需求的前提下,如何优化这些参数来设计系统输入输出特性并提升系统效率仍不明确。为此,该文以系统传输效率最优为目标,以同时实现恒压输出和零相角(zero phase angle,ZPA)输入特性为约束条件,提出了一种多中继无线供电系统线圈-电路参数优化设计方法。首先,基于二端口网络模型分析了恒压输出和ZPA输入的实现条件,以及传输效率的关键影响因素;其次,基于耦合系数与品质因数乘积指标对宽频率范围内的线圈最优匝数进行了分析;并根据所得到的最优线圈参数,提出了考虑恒压输出与ZPA输入特性的系统电路参数优化设计方法;最后,基于优化的线圈和电路参数搭建了一套五线圈无线供电系统样机,对线圈特性、输入输出特性以及系统效率进行了实验,验证了所提出参数优化设计方法的有效性。

A multi-relay wireless power transfer system includes many design parameters such as the coil self-inductance,the mutual inductance,the internal resistance,the operating frequency,and the compensation capacitance.Under the premise of meeting the load power requirements,it is still unclear how to optimize these parameters to design the system input and output characteristics and improve the system efficiency.Therefore,this paper proposes a coil-circuit parameter optimization design for the multi-relay wireless power transfer system with the goal of optimizing the transmission efficiency of the system and the constraints of simultaneously achieving constant voltage output and zero phase angle(ZPA)input characteristics.Firstly,based on a two-port network model,the realization conditions of the constant voltage output and the ZPA input,as well as the key factors affecting the transmission efficiency,are analyzed;Secondly,based on the product index of the coupling coefficient and the quality factor,the optimal number of the coils in a wide frequency range is analyzed;Based on the obtained optimal coil parameters,an optimal design for the system circuit parameters considering the constant voltage output and the ZPA input characteristics is proposed;Finally,based on the optimized coil and circuit parameters,a prototype of a five-coil wireless power transfer system is built.Experiments are conducted on the coil characteristics,the input output characteristics,and the system efficiency,verifying the effectiveness of the proposed parameter optimization design.