Battery charger with thermal runaway protection

  • US 5,214,370 A
  • Filed: 09/13/1991
  • Issued: 05/25/1993
  • Est. Priority Date: 09/13/1991
  • Status: Expired due to Term
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First Claim
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1. A battery charging circuit comprising:

  • a power input for accepting an AC energy source;

    a power output connected to a battery to be charged and supplying the regulated voltage to the battery; and

    a rectifier charging circuit for supplying current at the regulated voltage to the power output, and including a regulation control for controlling teh voltage;

    a temperature sensing device located proximate to the battery;

    scaling circuitry for converting a value of the temperature sensing device to a voltage magnitude;

    a voltage output of the scaling circuitry connected to the regulation control;

    wherein the improvement comprises;

    voltage sensing leads connected to terminals of the battery being charged and to the rectifier charging circuit;

    circuitry included in series with one of the voltage sensing leads for injecting a voltage into a path of the voltage sensing leads;

    whereby the voltage injected into the path of the voltage sensing leads alters the charging voltage supplied by the rectifier charging circuit to the battery to compensate for a temperature sensed by the temperature sensing device.

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