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AC-POWERED LED LIGHT ENGINES, INTEGRATED CIRCUITS AND ILLUMINATING APPARATUSES HAVING THE SAME

  • US 20150163875A1
  • Filed: 12/10/2014
  • Published: 06/11/2015
  • Est. Priority Date: 12/11/2013
  • Status: Active Grant
First Claim
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1. An ac-powered LED light engine, coupled between a rectifier and a plurality of extrinsic LED sub-arrays, comprising:

  • a plurality of normally closed bypass switches, each connected in parallel with a corresponding LED sub-array except for a topmost or a bottommost LED sub-array and shuttling between three switch states;

    ON, REGULATION, and OFF;

    a normally closed current regulator coupled to the corresponding normally closed bypass switches and used to regulate a highest LED current level near a peak of an extrinsic mains voltage; and

    a plurality of switch controllers each coupled to a corresponding normally closed bypass switch as a feedback network and taking control of the three switch states according to a corresponding current sense signal.

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