Patent ID: 11916403
Assignee: KONINKLIJKE PHILIPS N.V.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A method of operation for a power transmitter comprising:
transferring power to a power receiver using a power transfer coil via a power transfer signal;
receiving first data from the power receiver using a first communication channel, wherein the first communication channel utilizes, at least in part, modulation of the power transfer signal;
receiving power transfer control data from the power receiver using via a second communication channel,
wherein the second communication channel is independent of the power transfer signal;

determining whether the power receiver is absent using a proximity of the power receiver to the power transfer coil, wherein the proximity is detected in a response to the first data; and
restricting the wireless power transfer from the power transmitter to the power receiver in response to a detection of the absence of the power receiver
wherein the power transfer signal uses a repeating time frame,
wherein the repeating time frame comprises at least one power transfer time interval and at least one reduced power time interval,
wherein a power level of the power transfer signal is reduced during the reduced power time interval,
wherein the reduction of power during the reduced time interval is relative to the power transfer during power transfer time interval,
wherein the first communicator circuit is arranged to receive the first data during the at least one of the reduced power time interval(s).