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Battery charger for a backup power circuit

  • US 4,382,221 A
  • Filed: 06/12/1981
  • Issued: 05/03/1983
  • Est. Priority Date: 12/14/1979
  • Status: Expired due to Term
First Claim
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1. A temperature-compensated battery charger comprising:

  • a battery charger circuit providing increasing current to a charging battery as its terminal voltage increases until the terminal voltage reaches a predetermined value wherein the charging current decreases to a minimum amount, the predetermined value of terminal-voltage and the amount of charging current per unit of increasing terminal voltage applied by the charger circuit to the charging battery being varied by a control voltage input to the battery charger circuit; and

    sensing means responsive to the battery temperature, the sensing means providing the control voltage input to the battery charger circuit, wherein the predetermined value of terminal voltage and the amount of charging current per unit of terminal voltage applied by the charger circuit to the charging battery is varied in accordance with and is a function of the temperature of the charging battery, the battery charger circuit providing a temperature-stable reference voltage output, the sensing means being connected to the reference voltage output, the interconnecting junction of the reference voltage output and the sensing means providing the control voltage input to the battery charger circuit.

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