基于FPGA的无线传能数字控制系统的研究

Research on Wireless Power Transfer Digital Control System Based on FPGA

摘要: 文章分析了目前的无线传能控制系统的优缺点。为了解决磁耦合式无线传能系统的失谐问题，从理论上分析了系统的工作原理，提出了基于可变模全数字锁相环的频率跟踪控制方法；通过Simulink仿真分析了环路滤波器对系统响应速度和稳态误差的影响，并且通过在锁相环中增加误差量化环节提升了锁相环的锁相速度与锁相精度；最后基于FPGA设计了全数字WPT控制系统，实现了WPT系统的谐振频率自动跟踪，增加了系统过流和过温保护功能，通过仿真和制作样机进行实验，验证了本系统具有跟踪速度快，稳态误差小、安全稳定等优点。

Abstract: This paper analyzes the advantages and disadvantages of current wireless energy transfer control systems. In order to solve the detuning problem of the magnetic coupling wireless power transfer system, the working principle of the system is theoretically analyzed, and a frequency tracking control method based on variable mode digital phase locked loop is proposed. The influence of the loop filter on the system response speed and steady-state error is analyzed by Simulink simulation, and the phase-locked speed and phase-locking accuracy of the phase-locked loop are improved by adding the error quantization link in the phase-locked loop. Finally, based on FPGA, the all-digital WPT control system is designed to realize the automatic tracking of the resonant frequency of WPT system, which increases the over-current and over-temperature protection functions of the system. Through simulation and prototype production, it is verified that the system has fast tracking speed and stability, the state error is small, safe and stable.