Patent ID: 8587154
Filing Date: 2013-11-19
Classification: H01F,H02J,H04B

Abstract:
1. A primary unit for use in an inductive power transfer system, the system including said primary unit and a secondary device separable from said primary unit, the system of said primary unit and the secondary device having a resonant frequency and being operable to transfer power inductively to the secondary device, said primary unit comprising: a power transfer surface capable of enabling inductive coupling with said secondary device in a plurality of different working positions; a plurality of field generators arranged in an array, each of said field generators operable to generate an electromagnetic field for transferring power inductively to the secondary device, each of said field generators having an axis substantially perpendicular to said power transfer surface and being located at a different position relative to said power transfer surface such that said axes of said field generators are spaced apart with respect to each other; and driver circuitry operable to provide power from a power source to said field generators, said driver circuitry including: