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Lighting devices including current shunting responsive to LED nodes and related methods

  • US 8,847,516 B2
  • Filed: 12/12/2011
  • Issued: 09/30/2014
  • Est. Priority Date: 12/12/2011
  • Status: Active Grant
First Claim
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1. A device comprising:

  • a power supply;

    a light emitting device electrically coupled between the power supply and a reference node, wherein the light emitting device defines a node;

    a control element in a current shunting path electrically coupled in parallel with the light emitting device between the power supply and the reference node, wherein the control element is configured to control a voltage drop across the current shunting path responsive to an electrical signal from the node of the light emitting device, wherein the control element comprises a regulating transistor and wherein a control electrode of the regulating transistor is electrically coupled to the node of the light emitting device;

    a switching transistor electrically coupled in series with the regulating transistor in the current shunting path between the power supply and the reference node; and

    a controller coupled to a control electrode of the switching transistor, wherein the controller is configured to generate a pulse width modulated control signal that is applied to the control electrode of the switching transistor to vary a current though the current shunting path.

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