Patent ID: 9293942
Filing Date: 2016-03-22
CPC Classification: H02J

Claim Text:
1. An apparatus for wirelessly charging an energy storage element, said apparatus comprising: a rectifier configured to connect to said energy storage element; a coil configured to be energized by a charger via inductive coupling, wherein said coil includes a plurality of taps for supplying various inductances; a first capacitors having only one terminal connected to said coil at a first one of said plurality of taps; a second capacitor having only one terminal connected to said coil at a second one of said plurality of taps; a first switch connected to another one terminal of said first capacitor; a second switch connected to another one terminal of said second capacitor; a resistance measuring circuit for measuring instantaneous resistance of said energy storage element; a switch selection circuit, connected to said resistance measuring circuit, for selectively closing one of said switches to connect said rectifier to one of said capacitors according to an instantaneous resistance measured by said resistance measuring circuit.