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

Claim 11:
12. A wireless power transfer system comprising:
a power receiver and a power transmitter,
wherein the power transmitter comprises:
a resonance circuit,
wherein the resonance circuit comprises 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 wirelessly transfer power to a power receiver;

a driver circuit, wherein the driver circuit is configured to generate a drive signal for the resonance circuit,

a message receiver, wherein the message receiver is configured to receive at least one message from the power receiver,
a power loop control circuit,
wherein the power loop control circuit is configured to change a power of the drive signal in response to the at least one message received from the power receiver during a wireless power transfer phase,
wherein the power loop control circuit is configured to change the power of the drive signal while 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 a power of the drive signal; and

an adapter circuit coupled to the message receiver and the power loop control circuit,
wherein the adaptor circuit is configured to change the maximum limit in response to 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 during the wireless power transfer phase;
wherein the load indication is determined by the power transmitter independently from messages received by the power transmitter from the power receiver;

the power receiver comprising:
a data generator,
wherein the data generator is configured to generate load data,
wherein the load data reflects a loading of the power receiver; and

a communication transmitter,
wherein the communication transmitter is configured to transmit at least one message to the power transmitter,
wherein the at least one message comprises the load data.