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LED lamp

  • US 7,936,132 B2
  • Filed: 07/16/2008
  • Issued: 05/03/2011
  • Est. Priority Date: 07/16/2008
  • Status: Active Grant
First Claim
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1. A light-emitting diode (LED) lamp, comprising:

  • one or more LEDs;

    a rectifier configured to receive an input voltage and provide rectified input voltage;

    a first comparator configured to compare the rectified input voltage with a reference voltage and generate a sensed voltage, said sensed voltage being in a first state while the input voltage is provided and in a second state while the input voltage is not provided due to phase angle switching of the input voltage;

    a dimming factor circuit configured to receive the sensed voltage and generate a control signal indicative of the sensed voltage; and

    an LED driver configured to receive the input voltage and provide regulated current to said one or more LEDs, the LED driver configured to adjust the regulated current to said one or more LEDs based on the control signal to adjust output light intensity of said one or more LEDs.

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