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Ni-Cad battery charge rate controller

  • US 5,136,231 A
  • Filed: 10/12/1990
  • Issued: 08/04/1992
  • Est. Priority Date: 10/12/1990
  • Status: Expired due to Term
First Claim
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1. A circuit for charging a battery, comprising:

  • means for monitoring battery temperature;

    means for monitoring battery voltage;

    means for monitoring battery charge current;

    constant trickle current limit means connected in the charge path of the battery;

    a transistor having an input terminal, an output terminal and a control terminal, said input and output terminals connected to said constant trickle current limit means so as to be in parallel; and

    mans connected to said transistor control terminal, said battery temperature monitoring means, said battery voltage monitoring means and said battery charge current monitoring means for providing a signal to said transistor control terminal to turn on said transistor if the battery has been discharged, the battery temperature is within allowable limits, the battery is charging and the battery voltage is above a predetermined level and to turn off said transistor if said transistor has been turned on and the battery temperature exceeds a predetermined level.

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