公开(公告)号：WO2019050559A1

公开(公告)日：2019-03-14

申请号：PCT/US2018/014729

申请日：2018-01-22

Applicant: APPLE INC.

Inventor： SHAHSAVARI, Behrooz ,  HUANG, Weiyu ,  KADETOTAD, Sneha ,  GOWREESUNKER, Baboo, V.

IPC: H02J50/60 ,  G01V3/10 ,  H02J50/80 ,  H02J50/10

Abstract: A wireless power transmission system has a wireless power receiving device with a wireless power receiving coil that is located on a charging surface of a wireless power transmitting device with a wireless power transmitting coil array. Control circuitry in the wireless power transmitting device may use inverter circuitry to supply alternating-current signals to coils in the coil array, thereby transmitting wireless power signals. The control circuitry may also be used to detect foreign objects on the coil array such as metallic objects without wireless power receiving coils. For example, control circuitry may use inductance measurements from the coils in the coil array to identify segments of the coil array that correspond to potential wireless power receiving devices. The control circuitry may control wireless power transmission based on a comparison between the number of identified segments corresponding to potential wireless power receiving devices and a number of received device-identifiers.