Patent ID: 11909228
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H  B  Y | IPC B  H

Claim 15:
16. A foreign object detection apparatus, applied to a wireless charging system, wherein the foreign object detection apparatus comprises:
a coil array comprising at least one coil group, each coil group comprises four detection coils separately wound into a rectangle shape, the detection coils in the coil array are arranged in a matrix with even quantities of rows and columns, four detection coils in the coil array whose locations are symmetrical to each other are located in one coil group, and each detection coil is electrically connected to a foreign object detection circuit, wherein the coil array is divided into four quadrants based on a row center line and a column center line of the coil array, wherein detection coils in a same quadrant have a same wiring structure wound clockwise or counterclockwise, and wiring structures of the detection coils in adjacent quadrants are symmetrical to each other relative to a center line between the adjacent quadrants, and
the foreign object detection circuit configured to detect, based on an induction signal generated by each detection coil, whether there is a foreign object in a detection region corresponding to the coil array.