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Charging system for implantable hearing aids and tinnitus maskers

  • US 5,279,292 A
  • Filed: 02/13/1992
  • Issued: 01/18/1994
  • Est. Priority Date: 02/13/1991
  • Status: Expired due to Term
First Claim
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1. Charging system for implantable hearing aids and tinnitus maskers, comprising an implantable part with a repeatedly rechargeable battery direct voltage source, a receiving series-resonant circuit serving as a constant current source for the direct voltage source to be charged and a full-wave rectification diode bridge circuit having pairs of diodes, and an external part adapted to be located outside a user'"'"'s body, having a transmitting series-resonant circuit which is inductively couplable with the receiving series-resonant circuit for power transmission from outside the user'"'"'s body to inside the user'"'"'s body, said receiving series-resonant circuit comprising a receiving coil and a capacitor connected in series with each other and with said direct voltage source, said receiving coil and said capacitor being parts of a current charging circuit that is closed by a respective one of said pairs of diodes of the full-wave rectification diode bridge circuit depending on a phase of charging current flowing in said current charging circuit.

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