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Device for displaying remaining battery capacity

  • US 6,049,210 A
  • Filed: 01/20/1998
  • Issued: 04/11/2000
  • Est. Priority Date: 01/17/1997
  • Status: Expired due to Fees
First Claim
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1. A device for displaying a remaining capacity of a rechargeable battery, comprising:

  • a current sensing resistor connected between an external power source and said rechargeable battery, for sensing a charge current and a discharge current of said rechargeable battery;

    a current-to-frequency converter for converting said charge and discharge currents into charge and discharge count signals having charge and discharge frequencies, respectively;

    a microprocessor for directly receiving said charge and discharge count signals independently and comparing the respective charge and discharge frequencies with a predetermined frequency, thereby calculating the remaining capacity of the rechargeable battery and generating display data relating thereto; and

    a display for displaying the remaining capacity according to said display data.

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