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Current split circuit for equally splitting current between parallel connected LED luminaire strings

  • US 9,119,258 B2
  • Filed: 03/06/2013
  • Issued: 08/25/2015
  • Est. Priority Date: 03/06/2013
  • Status: Active Grant
First Claim
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1. A lighting circuit, comprising:

  • a plurality of strings of light emitting diodes connected to a power source, the plurality of strings of light emitting diodes being connected in parallel with each other; and

    a current split circuit connected to the plurality of strings of light emitting diodes, the current split circuit comprising a plurality of transistors, each transistor being directly connected to the power source, including;

    a reference transistor connected in series with a first of the plurality of strings of light emitting diodes, and one or more copy transistors connected to the reference transistor and in series with one of the plurality of strings of light emitting diodes, wherein the one or more copy transistors divides the current substantially equally between the plurality of strings of light emitting diodes, wherein the plurality of transistors divide the voltage output by the power source multiple times.

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