磁谐振式无线电能传输系统频率跟踪设计

Design of frequency tracking of wireless power transmission system with magnetic resonance type

无线电能传输系统在传输过程中,针对系统失谐导致输出功率大大降低的问题,文章在Matlab/Simulink仿真库搭建了一套能够自动进行频率跟踪反馈的磁谐振式无线传能仿真系统,并对高频逆变电路触发脉冲信号发生器进行了设计与改进,使系统能够在发射端实现电压电流接近同相位,从而使系统在收发端传输能量时,处于接近纯阻态特性,减小了谐振线圈之间的无功损耗,增加了系统传输效率。仿真数据表明,该系统能够实时对发射端电流进行检测,并通过数字锁相环电路的调节信号对高频逆变器进行调节,输出与发射端电流同相位的逆变电压,实时进行动态调节。

In the transmission process of the wireless energy transmission system,the output power of the system could reduce greatly if the detuning of the system.A wireless energy transmission simulation system with magnetic resonance type is constructed in the Matlab/Simulink simulation library,which can perform the frequency tracking and feedback automatically;and the trigger pulse signal generator of the high⁃frequency inverted circuit is designed and improved,which make system able to realize the voltage and current close to the same phase at the transmitting end,so that the system is close to the pure resistance state when the energy is transmitted from the receiving end to the sending end,so reduces the reactive power disslpation between the resonance coils and increases the transmission efficiency of the system.The simulation data show that the system can detect the current at the transmitting end in real time,adjust the high⁃frequency inverter by means of the adjustment signal of the digital phase⁃locked loop circuit and dynamic adjust it in real time,so as to realize the output of the inverter voltage with the same phase as the current at the transmitting end.