无线电能传输恒压拓扑及恒压输出控制方法

针对无线电能传输系统在负载和距离动态变化时,引起原边线圈电流不稳定和失谐问题,由此导致副边输出电压不恒定,设计一种原边LCL拓扑与副边恒压控制相结合的无线电能传输系统。首先,依据阻抗分析得到LCL-S型无线电能传输系统的数学模型;然后,通过设计参数,建立Simulink仿真模型,对该拓扑进行负载特性和频率特性分析;最后依据拓扑特性,设计了以DC-DC变换器为主控环节的副边恒压控制,使系统可以在变距离和变负载条件下,实现恒压输出特性。设计了副边的闭环控制程序,仿真验证了恒压控制效果。结果表明该控制策略可以实现快速有效的恒压控制。

Constant Voltage Topology and Constant Voltage Output Control Method for Wireless Power Transfer

In order to solve the problem of unstable current and detuning of primary coil when the load and distance of wireless power transfer system change dynamically, which results in unstable output voltage of secondary coil, a wireless power transfer system combining primary LCL topology with secondary constant voltage control is designed. Firstly, the mathematical model of LCL-S wireless power transfer system is obtained based on impedance analysis. Then, the Simulink simulation model is established by designing parameters, and the load and frequency characteristics of the topology are analyzed. Finally, according to the topology characteristics, the side constant voltage control with DC-DC converter as the main control link is designed. The system can achieve constant voltage output characteristics under variable distance and load conditions. The closed-loop control program of the secondary side is designed, and the constant voltage control effect is verified by simulation. The results show that the control strategy can achieve fast and effective constant voltage control.