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Temperature responsive battery charging circuit

  • US 3,895,283 A
  • Filed: 11/26/1973
  • Issued: 07/15/1975
  • Est. Priority Date: 11/26/1973
  • Status: Expired due to Term
First Claim
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1. In an electrical system of the type having a nickel cadmium battery, a source of unidirectional charging current, and a voltage regulator for controlling the output voltage of said source of unidirectional current in accordance with an applied sensing voltage related to the voltage level of said system, said voltage regulator causing said current source to operate at a predetermined maximum voltage level in the absense of said applied sensing voltage and at lesser voltage levels in the presence of said applied sensing voltage, a battery charge control and thermal runaway protection circuit comprising, in combination:

  • temperature sensing means including a sensor in thermal communication with said battery for generating a temperaturedependent reference signal; and

    battery charge control Means responsive to said reference signal and to the terminal voltage of said battery for terminating the application of sensing voltage to said voltage regulator for maximum charging effort when the terminal voltage of said battery falls below a predetermined level dependent on the temperature of said battery, and for applying sensing voltage to said regulator for reduced charging effort when the terminal voltage of said battery exceeds said predetermined level.

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