In aspects, techniques are disclosed for detecting and differentiating foreign matters in the vicinity of an inductive wireless power transfer system. The method is based on hybrid inductive and capacitive sensing. The apparatus includes a sensing system, a measurement circuit, and a controller. The sensing system senses an object based on at least one of an inductive effect or a capacitive effect. The sensing system includes an inductive sensing element having an electrical characteristic that varies based on an inductive effect in the presence of an object. The sensing system also includes a capacitive sensing element having an electrical characteristic that varies based on a capacitive effect in the presence of an object. A measurement circuit measures electrical characteristics in the inductive sensing circuit and the capacitive sensing circuit. The controller determines the presence of an object and distinguishes between a metallic object and a non-metallic object based on a change in the measured electrical characteristic.
在各方面,公开了用于检测和区分电感无线电力传输系统附近的异物的技术。该方法基于混合电感和电容感测。该装置包括感测系统、测量电路和控制器。感测系统基于电感效应或电容效应中的至少一项来感测物体。感测系统包括电感感测元件,该电感感测元件具有在物体存在时基于电感效应而改变的电特性。感测系统还包括电容感测元件,该电容感测元件具有在物体存在时基于电容效应而改变的电特性。测量电路测量电感感测电路和电容感测电路中的电特性。控制器确定物体的存在,并且基于所测量的电特性中的变化来区分金属物体和非金属物体。
Foreign object detection using hybrid inductive and capacitive sensing
使用混合电感和电容感测的异物检测
2024-11-15
Patent
Electronic Resource
Chinese
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