磁耦合谐振式无线电能传输系统特性研究

摘要

在设计磁耦合谐振式无线电能传输系统时,其参数选择对系统传输性能至关重要.对发射与接收端都采用串联电路模型来分析其传输特性,得出系统频率、传输距离和负载电阻与传输功率及传输效率的关系方程.通过仿真发现系统频率的改变对传输功率的作用更为显著,不同的负载电阻对应一个最佳传输距离使得传输功率最大.基于NE555多谐振荡器设计了一套频率可调的无线电能传输装置,通过实验验证了仿真分析的合理性,研究结果可指导磁耦合谐振式无线电能传输系统选择合适的频率、传输距离及负载电阻,使得传输性能较优.%When designing magnetic coupling resonance wireless power transfer system,the parameter selection is very important to the transmission performance of system.Based on that,the relationship between the system frequency,distance from the coil and load resistance including the transmission power and transmission efficiency is obtained.Simulation results show that the changes of the system frequency will obviously affect the transmission power;there is a best transmission distance for the different load resistances to get maximum transmission power.A wireless power transmission device is designed based on the NE555,for which the frequency can be adjusted.The experiment proves the rationality of the simulation analysis.The results can guide to select the appropriate frequency,coil distance and load resistance of the magnetic coupling resonance wireless power transfer system so as to get the better transmission performance.