CALIBRATION OF FOREIGN OBJECT DETECTION DURING CHANGES IN OPERATING CONDITIONS

A wireless power transmitter may 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, the wireless power transmitter may perform a second type of FOD to produce a FOD result. When the FOD result indicates a foreign object is present or likely present, the wireless power transmitter may discontinue or limit wireless power transfer, and/or communicate the FOD result to the wireless power receiver. When the FOD result indicates a foreign object is not present or likely not present, the wireless power transmitter may communicate the FOD result to the wireless power receiver, perform the recalibration and continue with wireless power transfer.