电动汽车无线充电系统金属异物检测灵敏度优化方法OA北大核心

To improve the metal object detection performance for an electric vehicle wireless charging system,a sensitivity optimization method for the detection coil was proposed.The equivalent electromagnetic model of a rectangular detection coil with a metal object approaching was established.The changing mechanism of the physical parameters of the coil was studied,and a theoretical formula for changes in the parameters of the detection coil which were caused by metal objects of different sizes was obtained.The influence of several configuration parameters on the sensitivity of the detection coil was analyzed,and the configuration of the detection coil was optimized by combining the actual operating conditions of wireless charging.Through the electromagnetic field simulation and experimental verification,the accuracy of the theoretical model was proved.Finally,a metal object detection experiment was carried out in a 3 kW wireless charging system,which verified that the metal object detection system built on the basis of the optimized detection coil can detect metal objects with a size of 25 mm and above.In addition,it had anti-interference capability.