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Led drive circuit

  • US 5,912,568 A
  • Filed: 03/21/1997
  • Issued: 06/15/1999
  • Est. Priority Date: 03/21/1997
  • Status: Expired due to Term
First Claim
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1. An LED drive circuit comprising:

  • a plurality of LEDs coupled together in parallel, said LEDs configured to be powered by a battery;

    a current source coupled to said LEDs, said current source providing a current signal level for driving said LEDs;

    a current sensor circuit coupled to said current source and configured to provide a first indication signal in response to the current signal flowing in said LEDs;

    a controller circuit coupled to said current sensor so as to receive said indication signal, said controller circuit further coupled to said current source so as to provide an appropriate voltage control signal to said current source so that the current drawn through said LEDs remains substantially at a desired level.

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