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Emergency lighting circuit for shunt-regulated battery charging and lamp operation

  • US 5,646,502 A
  • Filed: 08/28/1995
  • Issued: 07/08/1997
  • Est. Priority Date: 08/28/1995
  • Status: Expired due to Term
First Claim
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1. In a circuit including a first load operated on AC power and having a battery for providing current to a second load on discontinuation of AC power, the circuit being useful for charging the battery or a cell of the battery, comprising:

  • at least one current limited charging means for providing a source of charging current to the battery and for supplying current to the first load;

    means for passing charging current through the battery to charge the battery; and

    ,shunt regulated switch means for providing a low impedance circuit path, the low impedance circuit path not including the battery on termination of charging of the battery.

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