公开(公告)号：US20250088039A1

公开(公告)日：2025-03-13

申请号：US18612892

申请日：2024-03-21

Applicant: Apple Inc.

Inventor： Hanwei Wang ,  Giuseppe Pinto ,  Ruiyang Lin ,  Tao Li ,  Srinivasa V Thirumalai Ananthan Pillai ,  Jukka-pekka J Sjoeroos

IPC: H02J50/60 ,  H02J50/12 ,  H02J50/80

Abstract: A wireless power transmitter (WPT) can include WPT circuitry having a wireless WPT coil that transmits wireless power signals; and control circuitry coupled to the WPT circuitry that: measures a present value of a first function of quality factor and resonant frequency of the wireless power transmitting coil and a present value of a second function of quality factor and resonant frequency of the WPT coil while the WPT is coupled to a wireless power receiver; determines a change between the measured present values and corresponding baseline values of the first and second functions of quality factor and resonant frequency of the WPT coil; determines whether a foreign object is present responsive to the change between the measured present values and corresponding baseline values of the first and second functions of quality factor and resonant frequency exceeding a threshold in a magnetic state space.