Patent ID: 11949249
Assignee: MEDIATEK SINGAPORE PTE. LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. A wireless power transmitter, comprising:
circuitry configured to:
receive a request from a wireless power receiver to perform recalibration for a first type of foreign object detection (FOD) in response to the wireless power receiver attempting to change an electromagnetic parameter supplied by the wireless power transmitter;
in response to receiving the request, perform a second type of FOD to produce a FOD result;
perform the recalibration for the first type of FOD and continue with wireless power transfer conditioned on the FOD result produced by the second type of FOD indicating that a foreign object is not present or likely not present; and
in response to the FOD result indicating that the foreign object is present or likely present, performing one or more of discontinuing wireless power transfer, limiting wireless power transfer, or communicating the FOD result to the wireless power receiver;
wherein the wireless power receiver sends the request in an attempt to change from a low power mode of wireless power transfer to a high power mode of wireless power transfer, or from a high power mode of wireless power transfer to a low power mode of wireless power transfer,
wherein the first type of FOD measures a first electrical parameter of an electromagnetic coupling between the wireless power transmitter and the wireless power receiver, the second type of FOD measures a second electrical parameter of the electromagnetic coupling between the wireless power transmitter and the wireless power receiver, and the first electrical parameter is different from the second electrical parameter.