Patent ID: 6219267
Filing Date: 2001-04-17
Classification: H01F

Abstract:
A system for supplying electrical energy, comprising:a fixed base comprising a first sender induction coil energized by an electrical mains supply, anda mobile terminal comprising a second receiver induction coil supplying at least one socket outlet and designed to be placed opposite said base to enable inductive coupling between said first and second coils so that electrical energy received from the electrical mains supply can be transmitted to said at least one socket outlet with no electrical connection between said base and said terminal,wherein said base comprises first electronic means assuring at least one of the functions belonging to the group consisting of,converting a low-frequency electrical signal received via the electrical mains supply, the frequency being stepped up by an electronics stage assuring the function of a resonant inverter using two IGBT components to produce a high-frequency electrical signal energizing the sender induction coil of the base at an upper voltage, said sender coil being in the form of a sender plate housing concentric turns,detecting correct positioning and the presence of and/or identifying said terminal,the optimum efficiency of the system being conditioned by a concentric arrangement of the sender plate and of a receiver plate of said terminal placed one on the other, said sender and receiver plates having for this purpose a centering hole,said sender coil has an intermediate output energizing only a part of the sender coil for generating a low power just sufficient to establish a communication with said mobile receiver part so as when the mobile part is recognized, after an exchange of information between the base and the terminal, contact means connect the remainder of the sender coil to the receiver coil and all the power is transmitted, andvalidation of transfer of energy between said coils.