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Battery protective circuit

  • US 5,349,280 A
  • Filed: 09/03/1992
  • Issued: 09/20/1994
  • Est. Priority Date: 09/18/1991
  • Status: Expired due to Fees
First Claim
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1. A battery protective circuit, comprising:

  • comparison means for comparing a voltage of a re-charger with a second voltage provided by one of a battery supply voltage and an external supply voltage supplied to a main power terminal from adapter coupling means;

    first switching means for cutting off battery current being applied to the re-charger when current is supplied by a battery, said re-charger being charged by connecting an external source of power to the re-charger when said comparison means determines that the re-charger voltage is lower than said second voltage; and

    second switching means for causing power provided by the re-charger to be applied to the main power terminal when said comparison means determines that the re-charger voltage is higher than said second voltage.

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