Device for charging a portable element and associated method

摘要

A device (20) for charging a portable element (10) having a receiving antenna (Ar) for charging by induction, the charging device (20) includes: a charging surface (Sc); a plurality of emitting antennas (A1, A3); a layer of ferromagnetic material (30) placed beneath the plurality of emitting antennas (A1, A3); an electronic circuit; a plurality of resonators (R1, R2 . . . Ri): having a resonance frequency substantially equal to the emission frequency of the antennas, placed between the plurality of antennas and the charging surface, and suitable, when they are activated, for reflecting the magnetic field (B) emitted by the antennas, and connected to the electronic circuit in order to be deactivated individually, according to a criterion of positioning of the receiving antenna relative to the resonators. An associated charging method is also described.

主权项

1. A device for charging a portable element including a receiving antenna for charging by induction, said charging device comprising:
a surface for charging the portable element; a plurality of emitting antennas having an emission frequency, placed beneath the charging surface and emitting a magnetic field; a layer of ferromagnetic material placed beneath the plurality of emitting antennas and having a surface at least substantially equal to the charging surface; an electronic circuit comprising a control system connected to the emitting antennas; and a plurality of resonators:
having a resonance frequency substantially equal to the emission frequency,placed between the plurality of emitting antennas and the charging surface, andcovering an active surface at least substantially equal to the charging surface, configured, when the emitting antennas are activated, to reflect the magnetic field in the direction of the emitting antennas, andconnected to the electronic circuit by switches in order to be deactivated individually, according to a criterion of positioning of the receiving antenna relative to the resonators.