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System and Method For Controlling an Output Illumination Level of a Lighting System

  • US 20110001435A1
  • Filed: 04/09/2010
  • Published: 01/06/2011
  • Est. Priority Date: 04/09/2009
  • Status: Active Grant
First Claim
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1. A system for controlling a brightness level of a Light Emitting Diode comprising:

  • a Light Emitting Diode (LED);

    said LED connected in series with a field effect transistor and a resistor;

    a digital potentiometer;

    said digital potentiometer supplying a variable output voltage to an operational amplifier;

    said operational amplifier connected to said field effect transistor to activate said field effect transistor;

    a power supply connected to said LED;

    wherein said activation of said field effect transistor by said operational amplifier varies a voltage across said resistor adjusting the brightness level of said LED.

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