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Controlled fast charger

  • US 4,424,476 A
  • Filed: 01/16/1981
  • Issued: 01/03/1984
  • Est. Priority Date: 01/16/1981
  • Status: Expired due to Term
First Claim
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1. Apparatus for supplying a controlled charging current to a sealed rechargeable cell comprising:

  • (a) means connectable to an external electrical source for providing charging current;

    (b) controllable switching means connected in series between said charging current means and said rechargeable cell and being operable between a conducting state, wherein said charging current is supplied to said cell, and a non-conducting state wherein said charging current is interrupted;

    (c) thermal sensing means including first means in thermal proximity to said rechargeable cell for sensing the temperature of said rechargeable cell, and second means for sensing the ambient temperature; and

    (d) switching control means responsive to said thermal sensing means for maintaining said switching means in the conducting state, and thereby providing a path for the delivery of said charging current to said rechargeable cell, until the cell temperature exceeds the ambient temperature by a predetermined amount and thereafter maintaining that temperature difference.

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