基于Cuk变换的MCR-WPT系统阻抗匹配研究

Impedance-matching Study of MCR-WPT System Based on Cuk Transformation

在分析无线充电系统的基础上,在发射端检测电流电压相位并加入锁相环调整系统频率,使系统处于谐振状态,提升系统的传输效率。同时,为满足无线充电系统在不同负载阻值下都具有较高效率,在负载端接入Cuk变换器并采用PID控制策略实现系统恒功率输出。用Simulink仿真平台搭建模型,当系统处于谐振状态后,负载阻值在20、30、40Ω时系统传输效率最终稳定在0.84,并且稳定持续输出5 kW的功率。

Through analyzing the wireless charging system,detecting the current-voltage phase at the transmitting terminal and incorporating a phase-locked loop to adjust the system frequency so as to ensure that the system can operate in a resonant state and enhance transmission efficiency were implemented.In addition,with view to ensuring wireless charging system's high efficiency under different load impedances,a Cuk converter was connected at the load end,and a PID control strategy was adopted to achieve constant power output.Making use of Simulink simulation platform to construct a model was implemented to show that,when the system is in the resonant state and the load resistance stays at 20,30,40 Ω,the transmission efficiency of the system can be finally stabilized at 0.84 and the stable power output is 5 kW.