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Charging circuit with battery charge monitor circuit

  • US 5,563,495 A
  • Filed: 06/24/1994
  • Issued: 10/08/1996
  • Est. Priority Date: 06/28/1993
  • Status: Expired due to Fees
First Claim
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1. A charging circuit comprising:

  • a constant current source for supplying a constant current for charging a battery;

    a comparator having one input terminal, the other input terminal supplied with a reference potential and an output terminal connected to said one input terminal for generating an output signal having a period dependent upon a voltage of said battery;

    a capacitor connected between said one input terminal of said comparator and a ground potential;

    a resistor inserted between an output terminal of said constant current source and said one input terminal of said comparator; and

    a temperature compensating element connected in series with said resistor between said output terminal of said constant current source and said one input terminal of said comparator for compensating for a variation of period of the output signal caused by temperature dependent change of capacitance of said capacitor.

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