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Battery Charger

  • US 3,889,171 A
  • Filed: 10/12/1973
  • Issued: 06/10/1975
  • Est. Priority Date: 06/01/1972
  • Status: Expired due to Term
First Claim
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1. A battery charging circuit having, in combination, a direct current source, terminals for a battery having a predetermined float potential to be charged, a circuit connecting said source and terminals including a first variable impedance connected in series therewith, and control means including a thermally variable impedance varying as a continuous function of temperature and heat retaining and conducting means in position to transfer heat produced by current flowing in said first variable impedance to said thermally variable impedance, said control means being continuously responsive to increases in the temperature of said thermally variable impedance to produce corresponding decreases in the magnitude of said first variable impedance, said control means being continuously responsive to decreases in said current resulting from the charged state of the battery to produce corresponding increases in the magnitude of said first variable impedance continuously until said float potential is reached at said terminals.

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