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1. (WO2018083283) POWER TRANSMITTER AND METHOD FOR WIRELESSLY TRANSFERRING POWER

Pub. No.:    WO/2018/083283    International Application No.:    PCT/EP2017/078265
Publication Date: Sat May 12 01:59:59 CEST 2018 International Filing Date: Tue Nov 07 00:59:59 CET 2017
IPC: H02J 50/12
H02J 50/80
Applicants: KONINKLIJKE PHILIPS N.V.
Inventors: ETTES, Wilhelmus, Gerardus, Maria
STARING, Antonius, Adriaan, Maria
BRONTS, Lennaert, Quirijn
VELTMAN, Eddy, Gerrit
VAN WAGENINGEN, Andries
Title: POWER TRANSMITTER AND METHOD FOR WIRELESSLY TRANSFERRING POWER
Abstract:
A power transmitter (501) for a wireless power transfer system includes a parallel resonance circuit (601) comprising at a transmitter coil (503) for generating the power transfer signal. A power source (605) has a current sink terminal and a power source terminal providing current to the parallel resonance circuit (601) with a limited rate of change of the current drawn. A first switch element (607) is coupled between a first end of the parallel resonance circuit (601) and the current sink terminal. A second switch element (609) is coupled between the other end and the current sink terminal. A driver (611) generates a cyclic drive signal such that each cycle comprises a two time intervals in which one switch element (607, 609) is closed and the other (607, 609) is open; and a third time interval in which both the first switch element (607) and the second switch element (609) are closed, the third time interval being between the other two intervals.