一种基于磁耦合谐振式的高效率双频无线能量传输系统

为了提高磁耦合谐振式无线能量传输系统的效率，本文提出了一种新型的双频无线能量传输的发射和接收装置.在发射端和接收端中，该装置在发射端和接收端中均采用一个馈电线圈对两个谐振线圈馈电；两个谐振线圈工作在不同的频率并通过磁耦合的方式把能量从发射端向接收端同频传输.由于两个谐振线圈均参与了能量传输，所以该传输装置能在较远的距离实现效率较高的双频能量传输.为了验证该理论模型的特性，本文将其设计在PCB板材上并进行仿真和实验测试.仿真和实验结果表明：该双频磁谐振耦合无线能量传输装置的能量传输频率为6.78和13.56 MHz；在传输距离为装置尺寸60%时达到最高效率，其最高效率分别为88.5%和56.7%.

A dual-band wireless power transfer transmitting and receiving device with high efficiency

In order to improve the efficiency of dual-band magnetic resonance wireless power transfer (WPT) system,this paper presents a pair of dual-band transmitter and receiver at Industrial Scientific and Medical (ISM) band.Firstly,the two different resonators of the transmitting end are fed by one feeding loop,which is the same as that of the receiving end.Power is transferred from the transmitter to the receiver at the operating frequency of the two resonators by magnetic resonance.Since the two resonators are both delivering power at their own resonant frequency,the efficiency of proposed WPT can reach impressive values at a relative long distance.A pair of prototype transmitter and receiver is implemented using printed circuit boards (PCB) to validate the advance of the proposed scheme.Simulation and measurement results illustrate that the two operating frequencies of the WPT are 6.78 MHz and 13.56 MHz.The power transfer efficiencies reach their maximum value of 88.5% and 56.7% respectively when the distance is 60% of the overall dimensions.