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Induction charging apparatus and an electronic device

  • US 5,952,814 A
  • Filed: 11/14/1997
  • Issued: 09/14/1999
  • Est. Priority Date: 11/20/1996
  • Status: Expired due to Fees
First Claim
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1. An induction charging device for charging a rechargeable battery means in an electronic device, said induction charging device comprising:

  • a first casing having a charging receptacle for receiving said electronic device, said electronic device having a second casing of an external shape at least partly matching an internal shape of said charging receptacle;

    a primary coil for magnetic coupling to a secondary coil comprised in said electronic device so as to inductively convey energy for charging said rechargeable battery means;

    an alternating current power source for coupling to said primary coil;

    said charging receptacle comprising a first mechanical presence indication means of a first shape for cooperating with a second mechanical presence indication means of a second shape matching said first shape, said second mechanical presence indication means being a part of said second casing, said alternating current power source being de-coupled from said primary coil if said electronic device is not introduced into said charging receptacle, and said first mechanical presence indication means being arranged for controlling said alternating current power source to be coupled to said primary coil if said electronic device is introduced into said charging receptacle.

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