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AC LED DIMMER AND DIMMING METHOD THEREBY

  • US 20100060181A1
  • Filed: 09/04/2009
  • Published: 03/11/2010
  • Est. Priority Date: 09/05/2008
  • Status: Active Grant
First Claim
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1. An alternating current (AC) light-emitting diode (LED) dimmer, comprising:

  • a rectifier to receive AC voltage from an AC voltage source and to first full-wave rectify the AC voltage;

    a voltage converter to receive the first full-wave rectified voltage from the rectifier, to generate a second full-wave rectified stepped-up voltage, and to generate a pulse enable signal;

    a pulse width modulation controller to receive the second full-wave rectified stepped-up voltage and to generate a pulse width modulation signal to dim an AC LED in response to the pulse enable signal; and

    a switch to drive the AC LED under control of the pulse width modulation signal.

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