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Fast battery charging method and apparatus with temperature gradient detection

  • US 5,519,303 A
  • Filed: 09/30/1993
  • Issued: 05/21/1996
  • Est. Priority Date: 09/30/1993
  • Status: Expired due to Term
First Claim
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1. A control circuit for charging a battery, comprising:

  • a temperature sensor for sensing a temperature of the battery;

    a first derivative calculating means for calculating a first derivative of the temperature of the battery;

    a second derivative calculating means for calculating a second derivative of the temperature of the battery; and

    a switch operatively coupled to said temperature sensor, said first derivative calculating means and said second derivative calculating means for disabling charging of the battery when both the second derivative of the temperature of the battery is positive and the first derivative of the temperature of the battery is above a predetermined threshold.

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