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Light engine with LED switching array

  • US 9,357,604 B2
  • Filed: 08/14/2012
  • Issued: 05/31/2016
  • Est. Priority Date: 08/16/2011
  • Status: Active Grant
First Claim
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1. An LED array switching apparatus, comprising, on a single PCB substrate:

  • a plurality of LED arrays (D1 to Dn) connected in series, each LED array having a forward voltage;

    an AC voltage supply coupled to the plurality of LED arrays; and

    a plurality of constant current sources (G11 to Gn), coupled to output cathodes of LED arrays (D1 to Dn), respectively, each of the constant current sources being switchable between a current regulating state and an open state such that as the voltage of the AC voltage supply increases, LED arrays are switched on and lit to form a higher forward voltage LED string, and as the voltage of the AC voltage supply decreases, LED arrays are switched off and removed from the LED string starting with the most recently lit LED array, wherein the plurality of constant current sources (G11 to Gn) are directly coupled to the output cathodes of LED arrays (D1 to Dn), respectively.

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