公开(公告)号：US20220416586A1

公开(公告)日：2022-12-29

申请号：US17850325

申请日：2022-06-27

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Chunsen TANG ,  Zhihui WANG ,  Yaoyi WANG ,  Pengfei BAI ,  Zhenzhen WANG ,  Jiakai CAO ,  Wei KUANG ,  Zhixian WU

IPC: H02J50/60 ,  H02J50/00 ,  H02J50/10 ,  B60L53/124

Abstract: This application provides a foreign object detection method and apparatus, and a wireless charging system. The foreign object detection apparatus includes a coil array and a foreign object detection circuit. The coil array includes at least one coil group, and each coil group includes four detection coils whose locations are symmetrical to each other. The foreign object detection circuit determine an abnormal-value threshold of each coil group based on induction signals of each coil group and that are obtained in a first time period, and detect, based on the abnormal-value threshold and the induction signals of each coil group, whether there is a foreign object; when it is determined that there is no foreign object, detect, based on the signal threshold of each coil group and induction signals that are of each coil group and that are obtained in a second time period, whether there is a foreign object.