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Solid State Lighting, Driver Circuits, and Related Software

  • US 20100117545A1
  • Filed: 10/20/2009
  • Published: 05/13/2010
  • Est. Priority Date: 04/30/2008
  • Status: Active Grant
First Claim
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1. A solid state lighting driver circuit comprising:

  • a EMI filter configured and arranged to receive a AC input from an AC power supply;

    a rectifier connecting the EMI filter, the rectifier being configured and arranged to receive AC power from the EMI filter and produce a rectified current;

    a power factor correction (PFC) stage including a boost circuit connected to the rectifier, the boost circuit being configured and arranged to receive the rectified current and to produce a power factor corrected output with a higher voltage than the AC input of the AC power supply;

    a Buck regulator configured and arranged to receive power from the PFC stage and regulate power for supply to a plurality of LEDs; and

    a controller configured and arranged to control the Buck regulator and PFC stage for hysteretic PFC start-up.

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