动态载荷下WPT系统的特性分析与实验研究

针对无线电能传输系统中普通存在的载荷动态变化的问题,提出了一种LCC-S补偿网络结构.建立了系统的互感模型,推导了发射端、接收端的动态性能特性,分析了动态载荷工况下,系统的发射端电流、相位角、谐振频率、输出功率的效率的变化趋势.最后,搭建实验平台,采用可变电阻负载和电机负载,测试了电阻的不同阻值和电机的不同转速时的系统特性,验证了理论分析的正确性.在传输距离为5 cm且负载电阻为10 Ω～50 Ω时,实现2.3 A的发射端恒流输出.当负载电阻为30 Ω时,系统效率和传输功率分别为83.4％和16.8 W.

Characteristic Analysis and Experimental Study of WPT System with Dynamic Load

An LCC-S compensation network is proposed to solve the problem of dynamic load variation in wireless power transfer system. The mutual inductance model of the system is established. The dynamic performance characteristics of the original receiver are deduced. The variation trend of the transmitting terminal current, phase Angle, resonance frequency and output power efficiency of the system under the dynamic load condition is analyzed. Finally, an experimental platform was built, and variable resistance load and motor load were used to test the system characteristics of different resistance values and motor speeds. The results verify the correctness of theoretical analysis.