×

Light emitting diode replacement lamp

  • US 9,622,316 B2
  • Filed: 04/30/2015
  • Issued: 04/11/2017
  • Est. Priority Date: 09/12/2003
  • Status: Active Grant
First Claim
Patent Images

1. An illumination device comprising:

  • a substrate;

    one or more light-emitting diodes (LEDs) disposed on the substrate;

    a heat sink thermally connected to the one or more LEDs;

    thermal-management circuitry (i) disposed on the substrate, (ii) electrically connected to the one or more LEDs, and (iii) configured to control current to the one or more LEDs based on an LED temperature resulting from heat produced by the one or more LEDs, the thermal management circuitry comprising;

    a temperature-dependent resistance;

    a resistor connected in parallel with the temperature-dependent resistance;

    a source voltage input for receiving a source voltage,wherein the sense voltage is generated at least in part by at least a portion of a regulated current flowing through the resistor and the temperature-dependent resistance.

View all claims
  • 11 Assignments
Timeline View
Assignment View
    ×
    ×