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Battery charger for an electronic device and a spare battery

  • US 5,721,481 A
  • Filed: 03/08/1996
  • Issued: 02/24/1998
  • Est. Priority Date: 03/08/1995
  • Status: Expired due to Fees
First Claim
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1. A battery charger, comprising:

  • means for connecting in series to a first power feed line along which an AC/DC adaptor supplies a drive current to an electric/electronic device;

    a first switch for connecting and disconnecting said first power feed line to said electric/electronic device;

    a second power feed line that is connected in parallel with said first power feed line to supply at least a part of said drive current as a charging current for a battery;

    a second switch for connecting and disconnecting said second power feed line to said first power feed line; and

    a charge controller for controlling the opening and the closing of said first switch and said second switch.

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