电动汽车无线供电系统电能发射线圈设计与切换控制

针对采用级联式发射线圈的电动汽车无线供电系统中线圈切换时存在的互感急剧下降及汽车位置检测困难的问题,提出了一种对嵌式电能发射线圈,并根据互感稳恒原则及其计算方法,给出了对嵌式电能发射线圈主要参数的设计方法,提出了一种双线圈式车体位置检测传感器,给出了传感器的尺寸参数设计方法及电能传输系统对传感器的干扰抑制方法,阐述了级联式发射线圈的切换控制策略.基于Ansoft Maxwell平台、Matlab/Simulink平台和电动汽车ICPT无线供电系统实验平台分别对研究成果进行了仿真分析和实验验证,结果表明:实验实测互感值波动率约为8%,车载拾取电压波动率约为10%,对嵌式能量发射线圈能够有效地缓解ICPT无线供电电动车在切换过程中的互感下降问题;双线圈式车体位置检测系统能够有效地在40 kHz能量通道电磁场的干扰中拾取位置信号,表明该位置检测方案及切换控制策略的可行性. 

Design and Switching Control of Power Supply Coils Applied to ICPT-Based Electric Vehicles

For the inductively coupled power transfer (ICPT) system of electric vehicles (EVs) with cascading power supply coils, there is a sharp drop of the mutual inductance and difficult to detect the EV position when the power supply coils switch. To deal with this, a novel embeddable power supply coil was developed. The design method for the parameters of the coil was also presented based on the constant principle and computational methods of mutual inductance. Besides, a position detection sensor with double coils was designed. The parameter design method of the sensor, the suppression strategy for the power flow disturbance to the sensor, and the switching control strategy of the cascading power supply coils were presented. Finally, based on the simulations on Ansoft Maxwell, Matlab/Simulink and ICPT experiment platform, the results were verified. The relative fluctuation ratios of mutual inductance and the pickup voltage are about 8% and 10% respectively. The position detection sensor with double coils can reliably detect the position of EV in the energy channel of 40 kHz electromagnetic field.