Search International and National Patent Collections

1. (WO2017153164) WIRELESS INDUCTIVE POWER TRANSFER

Pub. No.:    WO/2017/153164    International Application No.:    PCT/EP2017/053966
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Thu Feb 23 00:59:59 CET 2017
IPC: H04B 5/00
H02J 50/12
H02J 50/80
Applicants: KONINKLIJKE PHILIPS N.V.
Inventors: ETTES, Wilhelmus Gerardus Maria
Title: WIRELESS INDUCTIVE POWER TRANSFER
Abstract:
A wireless power transfer system comprises a power transmitter (101) arranged to wirelessly power a power receiver (103) via an inductive signal. The power transmitter (101) comprises a variable resonance circuit for generating the inductive signal in response to a drive signal. The resonance circuit has a variable resonance frequency and comprises a transmitter coil (121) arranged to generate the inductive signal. A driver (707) generates the drive signal for the variable resonance circuit and a modulator (711) amplitude modulates the inductive signal by varying the variable resonance frequency in response to data values for transmission to the power receiver (105). The power receiver (105) comprises a demodulator (1105) for demodulating amplitude modulation of the inductive signal and a first power extractor (1113) for extracting power from the inductive signal and for powering at least part of the power receiver. The inductive signal may be provided in addition to a higher power main power transfer signal.