Patent ID: 11936208
Assignee: KONINKLIJKE PHILIPS N.V.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. The power transmitter of claim 1, further comprising:
at least two pluralities of balanced detection coils,
wherein the at least two pluralities of balanced detection coils comprises the first plurality of balanced detection coils and at least a second plurality of balanced detection coils,
wherein the second plurality of balanced detection coils comprises a third detection coil and a fourth detection coil,
wherein the third detection coil and the fourth detection coil are arranged such that signals induced in the first detection coil by an electromagnetic field generated by the transmitter coil is compensated by a second signal induced in the second detection coil by the electromagnetic field generated by the transmitter coil;

a switch circuit, wherein the switch circuit is arranged to time sequentially couple one of the at least two pluralities of balanced detection coils to the secondary winding via a series coupling,
wherein the compensation circuit is arranged to apply different parameter values for the drive signal depending on whether the first plurality or the second plurality is coupled to the secondary winding.