基于四线圈的动态无线输电的位置检测

Position Detection Based on Four Coils Applied in Dynamic Wireless Power Transmission

在无线输电系统中,当接收线圈相对于发射导轨或线圈发生左右偏移时,二者之间互感下降,从而导致电动汽车获取的电能减少,系统效率下降。针对这个问题,提出一种车辆位置检测方法,将其应用于发射侧为分布式发射线圈的动态无线输电系统中,为接收侧的驾驶员提供车辆相对于发射线圈的位置信息,协助驾驶员主动调整车辆位置,使接收线圈尽量与发射线圈对准,从而使得二者的互感达到最大,汽车能稳定拾取电能,系统运行效率也尽可能提高。所提方法采用4个感应线圈,通过检测感应线圈上的感应电压,计算接收线圈相对于发射线圈的横向偏移。通过仿真分析检测原理,验证了该方法的准确性,并通过实验证明其可行性。实验证明,该方法能够较准确地检测接收线圈偏移的方向和距离。

In the wireless power transfer system,when the receiving coil shifts left and right relative to the transmitting guide or coils,the mutual inductance between them decreases,which may cause electric energy obtained by the electric vehicle(EV)reduce and system efficiency decline.Aiming at this problem,this paper proposes detection method for vehicle position and applies it in the dynamic wireless power transfer system with distributed transmitting coils at the transmitting side.This method assists the driver at the receiving side to adjust the vehicle position actively by providing the position information of the vehicle.Hence,the misalignment between the transmitting and receiving coils is able to be minimized so that the mutual inductance between them can be maximized.Therefore,the vehicle can steadily pick up power and the efficiency of the system is improved.The proposed method utilizes four induction coils,and by detecting the induction voltages on the induction coils,the lateral deviation of the receiving coil relative to the transmitting coil is calculated.The paper also analyzes the detection mechanism and verifies the accuracy and feasibility by simulation and experiment.The eexperimental results indicate that the system can accurately detect the offset direction and distance of the receiving coil.