基于动态匹配法的无线电能传输效率分析

Analysis of the Efficiency of WPT Based on Dynamic Matching Method

作为无线电能传输(WPT)技术一个新的发展方向,磁耦合谐振式WPT技术具有较大的传输距离、较高的传输功率和效率以及无辐射性和穿透性等优势。然而,在定距离磁耦合谐振式WPT装置中,当发射线圈与接收线圈间的距离由于某种原因发生变化时,电路阻抗需要实时匹配,才能保证系统始终工作在该距离的最大效率。在分析前述问题的基础上,提出了一种动态匹配优化方法,并通过仿真与实验验证了该方法能有效提高系统在变距离环境中的传输效率。

As a new development trend, wireless power transfer（WPT） via coupled magnetic resonances has more merits：delivering higher power at longer ranges and with more efficiency, non-radioactive and penetrability.However, considering a constant-distance WPT device via coupled magnetic resonances, when the distance between transmitting coil and receiving coil changes due to some reason, the impedance of the circuit requires real-time matching, in order to ensure the system working in the maximum efficiency of the distance.The analysis based on the problems above, puts forward a dynamic matching optimization method and verifies that this method can effectively improve the variable-distance system＇s energy transmission efficiency by simulation and experiment.