US 12,218,516 B2
Wireless power transfer
Johannes Wilhelmus Draak, Horst (NL); Wilhelmus Gerardus Maria Ettes, Leeuwarden (NL); and Klaas Jakob Lulofs, Veldhoven (NL)
Assigned to Koninklijke Philips N.V., Eindhoven (NL)
Appl. No. 18/268,253
Filed by KONINKLIJKE PHILIPS N.V., Eindhoven (NL)
PCT Filed Dec. 15, 2021, PCT No. PCT/EP2021/085814
§ 371(c)(1), (2) Date Jun. 19, 2023,
PCT Pub. No. WO2022/136042, PCT Pub. Date Jun. 30, 2022.
Claims priority of application No. 20216484 (EP), filed on Dec. 22, 2020.
Prior Publication US 2024/0055899 A1, Feb. 15, 2024
Int. Cl. H02J 50/12 (2016.01)
CPC H02J 50/12 (2016.02) 20 Claims
OG exemplary drawing
 
1. A power transmitter comprising:
an output resonance circuit, wherein the output resonance circuit comprises at least one transmitter coil and at least one capacitor;
a driver circuit, wherein the driver circuit is arranged to generate a drive signal for the output resonance circuit so as to generate a power transfer signal;
a resonance detector circuit,
wherein the resonance detector circuit is arranged to measure a first coupled resonance frequency for the output resonance circuit during a resonance measurement time interval,
wherein the first coupled resonance frequency is for a coupling between the output resonance circuit and a power transfer input resonance circuit of a power receiver,
wherein the power transfer input resonance circuit has a quality factor of no less than ten during the resonance measurement time interval;
an estimation circuit, wherein the estimation circuit is arranged to determine a coupling factor for a coupling between the at least one transmitter coil and at least one receiver coil in response to a non-coupled resonance frequency of the output resonance circuit and the first coupled resonance frequency; and
an adapter circuit, wherein the adaptor circuit is arranged to set an operating parameter in response to the coupling factor.