CPC H02J 50/12 (2016.02) [G01L 1/22 (2013.01); G01P 15/00 (2013.01); G01R 19/12 (2013.01); G01V 1/00 (2013.01); G01V 3/081 (2013.01); G01V 8/12 (2013.01); H02J 7/0047 (2013.01); H02J 7/04 (2013.01); H02J 50/23 (2016.02); H02J 50/40 (2016.02); H02J 50/402 (2020.01); H02J 50/90 (2016.02); H02J 7/00718 (2020.01); H02J 7/007184 (2020.01)] | 6 Claims |
1. A method for operating a charging device, comprising:
transferring power to a receiving device in accordance with a charging configuration, including providing a charging current to a resonant circuit according to the charging configuration, the charging configuration being generated after determining that the receiving device has been placed at a first location on a charging surface of the charging device;
detecting a change or rate of change in voltage or current level in the resonant circuit while transferring power to the receiving device;
initiating a measurement slot by terminating the charging current for a period of time after detecting the change or rate of change in the voltage or current level;
determining, during the measurement slot, whether the receiving device has been moved away from the first location;
resuming power transfer to the receiving device in accordance with the charging configuration by resuming the charging current to the resonant circuit when the receiving device remains at the first location; and
discontinuing power transfer to the receiving device after determining that the receiving device has been moved away from the first location.
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