磁谐振耦合式单中继线圈无线功率接力传输系统的建模与分析

Modeling and Analysis of Magnetic Resonance Coupling Wireless Relay Power Transfer System With Single Intermediate Coil Resonator

传统的由发射–接收线圈谐振器组成的基于磁谐振耦合的无线功率传输系统只能短距离的传输能量,在发射端和接收端之间适当的位置插入中继线圈谐振器可以有效的提高传输距离。该文对插入单中继线圈的磁耦合谐振式无线功率接力传输系统进行了研究,得出临界耦合条件和最大功率传输条件。研究了发射线圈和接收线圈之间的交叉耦合系数k13对系统的影响,并得到避免其不利影响的设计准则。数值仿真和实验表明,恰当的使用中继线圈不但能显著提高传输距离,并且因为系统的传输效率和负载功率对中继线圈的横向偏移和角度倾斜变化不敏感,因此还能提高设计的灵活性。

The traditional wireless power transmission（WPT） system composed with the transmitting and receiving coil resonators based on magnetic resonance coupling could transfer energy just in short distance.Inserting felicitously some intermediate coil resonators between the transmitter and receiver would increase the distance effectively.In the paper,the WPT system with an intermediate coil resonator is studied.The critical coupling condition and the maximum power transmission condition is derived,moreover the effects of the cross coupling coefficient k13 between the transmitting and receiving coils is discussed in order to obtain the designing rules to avoid its adverse effects.The numerical simulations and experiments indicate that proper use of the relay coil may not only increase the transmission distance significantly but also improve the flexibility in design process because the transmission efficiency and transferred power are not sensitive to the lateral displacement or inclination of the relay coil.