磁耦合谐振式无线能量传输的阻抗匹配特性

Study on impedance matching of magnetic coupled resonant wireless energy transmission

针对无线电能传输过程中传输效率随匹配阻抗大小变化的特点,提出两种阻抗匹配的方法:一种是基于步进电动机通过检测网络反馈信号,控制网络通过GA神经网络算法控制步进电动机,改变电容实现阻抗匹配;另一种是基于直直变换器中Cuk电路的占空比大小来匹配阻抗的方法。在负载和线圈之间嵌入单相桥式整流电路和Cuk升降压变压器实现匹配。根据最大传输功率理论,定量分析了改变电路的阻抗值大小,使系统的传输功率及效率最大。在MATLAB/Simulink平台验证了两种阻抗匹配设计方案的有效性。结果表明,利用基于步进电动机和Cuk电路的阻抗匹配方法可以实现最佳阻抗值匹配,使无线电能传输效率最大化。

In view of the characteristics that the transmission efficiency varies with the matching impedance in the process of radio power transmission,and that the output power of power source is maximized and the output efficiency is the highest,two methods of impedance matching are proposed,One is based on the stepper motor through the detection network,control network algorithm to achieve impedance matching,the other is based on Cuk circuit impedance matching method.Matching between load and coil by embedding single-phase bridge rectifier circuit and Buck-Boost step-up and step-down transformer.According to the maximum transmission power theory,the impedance value of the regulating circuit is quantitatively analyzed to improve the efficiency of the system in the transmission process.The validity of the two impedance matching design schemes is verified on MATLAB/Simulink platform.The results show that the impedance matching method based on stepping motor and Cuk circuit can achieve the best impedance matching and maximize the transmission power of radio energy.