Patent ID: 11955811
Assignee: KONINKLIJKE PHILIPS N.V.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. A method of operating a power transmitter, wherein the power transmitter comprises an adapter circuit coupled to a message receiver and a power loop control circuit, and wherein the power transmitter further comprises a resonance circuit, wherein the resonance circuit has a capacitive impedance and an inductive impedance, wherein the inductive impedance comprises a transmitter coil, wherein the transmitter coil is configured to generate a power transfer signal, wherein the power transfer signal is configured to transfer power to a power receiver, the method comprising:
generating a drive signal for the resonance circuit;
receiving, at the message receiver, at least one message from the power receiver during a wireless power transfer phase;
adjusting, by the power loop control circuit, a power of the drive signal in response to the at least one message received from the power receiver,
wherein the adapting is subject to maintaining a power parameter below a maximum limit,
wherein the power parameter comprises at least one of a current of the resonance circuit, a voltage of the resonance circuit, and the power of the drive signal;
determining a load indication, wherein the load indication is determined by the power transmitter based on the change in power of the drive signal due to the influence of a load of the power receiver on the resonant circuit during the wireless power transfer phase; and
adapting, by the adapter circuit, the maximum limit in response to the load indication;
wherein the load indication is determined by the power transmitter independently from messages received by the power transmitter from the power receiver.