US 12,249,845 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 Mar. 18, 2024, as Appl. No. 18/607,603.
Application 18/607,603 is a continuation of application No. 17/227,417, filed on Apr. 12, 2021, granted, now 11,955,811.
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 2024/0223016 A1, Jul. 4, 2024
This patent is subject to a terminal disclaimer.
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 is selected from the group consisting 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 driver circuit is configured to determine a change in a power indication,
wherein the change in the power indication is based on the input power for the driver circuit, and
wherein the adapter circuit is configured to determine the load indication as a function of the power indication,
wherein the load indication is determined independently from messages received by the power transmitter from the power receiver.