Patent ID: 8004235

Claim:
An inductive charging system comprising: a primary circuit including a power source, a controller electrically coupled to said power source and a primary coil electrically coupled to said controller, wherein said controller applies power with a frequency to said primary coil from said power source; a secondary circuit including a secondary coil inductively coupled to said primary coil, a feedback circuit electrically coupled to said secondary coil and a battery electrically coupled to and chargeable by power from said secondary coil; wherein said feedback circuit includes an over-voltage detector and an over-current detector arranged to control a switch, wherein in response to an over-voltage condition or an over-current condition said feedback circuit communicates feedback to said primary circuit via said inductive coupling by actuating said switch to direct current from said secondary coil through an impedance element to vary a reflected impedance of said secondary circuit; wherein said controller controls a characteristic of said power applied to said primary to correct said over-voltage condition or said over-current condition at least partially in response to said feedback.