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Method and apparatus for controlling dimming levels of LEDs

  • US 8,629,619 B2
  • Filed: 08/18/2010
  • Issued: 01/14/2014
  • Est. Priority Date: 08/26/2009
  • Status: Active Grant
First Claim
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1. A dimming circuit for an LED, comprising:

  • a current controller configured to receive a dimming input and to output a pulse width modulation signal (PWM) and a reference voltage;

    a current converter configured to provide an output current; and

    a shunt switch connected to the controller and to the current converter and between the current controller and the LEDs, wherein the shunt switch is non-conducting when the dimming input exceeds a threshold level.

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