双边控制的恒压无线充电系统设计

Design of Constant-voltage Wireless Charging System with Dual-side Control

基于磁感应原理设计了用于变负载恒压充电的无线电能传输系统。首先,分析二次侧半桥整流器对充电电压的调节作用,得到占空比与充电电压的关系,采用PI控制算法实现变负载的恒压充电;其次,原边通过扰动观测法跟踪调节最小输入电流,用于提高系统效率;最后,搭建系统实验平台对该系统设计进行验证。结果表明,在传输距离为5.5 cm时,通过调节整流电路的占空比和最小输入电流跟踪算法下在负载电阻为1~10Ω时,可实现12 V的恒压充电,同时传输效率可达85%。

Based on the principle of magnetic induction,a wireless power transmission system for variable load constant voltage charging was designed.Firstly,the regulation effect of the secondary side half bridge rectifier on the charging voltage was analyzed,and the relationship between the duty ratio and the charging voltage was obtained.Secondly,the constant voltage charging with variable load was realized by using the PI control algorithm.The minimum input current was tracked and adjusted by the perturbation observation method to improve the system efficiency.Finally,the system experimental platform was built to verify the design of the system.The results show that when the transmission distance is 5.5 cm,by adjusting the duty cycle of the rectifier circuit and the minimum input current tracking algorithm,and when the load resistance is 1~10Ω,12 V constant voltage charge and transmission efficiency of 85%can be achieved at the same time.