US 11,955,811 B2
Wireless inductive power transfer
Antonius Adriaan Maria Staring, Eindhoven (NL); and Andries Van Wageningen, Wijlre (NL)
Assigned to Koninklijke Philips N.V., Eindhoven (NL)
Filed by KONINKLIJKE PHILIPS N.V., Eindhoven (NL)
Filed on Apr. 12, 2021, as Appl. No. 17/227,417.
Application 17/227,417 is a continuation of application No. 16/068,809, granted, now 10,985,613, previously published as PCT/EP2017/050169, filed on Jan. 5, 2017.
Claims priority of application No. 16151007 (EP), filed on Jan. 13, 2016.
Prior Publication US 2022/0029474 A1, Jan. 27, 2022
Int. Cl. H02J 50/12 (2016.01); H01F 27/28 (2006.01); H02J 50/80 (2016.01)
CPC H02J 50/12 (2016.02) [H01F 27/28 (2013.01); H02J 50/80 (2016.02)] 19 Claims
OG exemplary drawing
 
1. A power transmitter comprising:
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 the power of the drive signal; and
an adapter circuit coupled to the message receiver and the power loop control circuit,
wherein the adapter 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 a 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
wherein the load indication is determined by the power transmitter independently from messages received by the power transmitter from the power receiver.