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Battery charging and testing circuit

  • US 4,426,612 A
  • Filed: 04/16/1982
  • Issued: 01/17/1984
  • Est. Priority Date: 04/16/1982
  • Status: Expired due to Term
First Claim
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1. A constant current battery charging circuit, which comprises:

  • an input voltage source;

    a trickle charge circuit coupled between said input voltage source and a battery to be charged;

    a full charge circuit coupled between said input voltage source and the battery to be charged;

    said full charge circuit including means for providing a constant current;

    means for controlling said constant current means;

    means for sensing the voltage of the battery;

    means for providing a reference voltage;

    an operational amplifier for comparing the sensed battery voltage with the reference voltage;

    means for operating said controlling means in response to said operational amplifier, whereby said full charge circuit will be inoperative and said trickle charge circuit will be operative when the battery voltage is above a threshold;

    means for testing the battery condition including a separate test circuit having means for providing a reference voltage, means for sensing the battery voltage, means for comparing the sensed battery voltage with the reference voltage, and means for indicating a selected battery condition in response to said comparing means.

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