LED LIGHT WITH THERMOELECTRIC GENERATOR

• US 20110234107A1
• Filed: 03/25/2011
• Published: 09/29/2011
• Est. Priority Date: 03/26/2010
• Status: Active Grant

• Current Assignee: Ilumisys Incorporated (Altair Engineering Incorporated)
• Original Assignee: Altair Engineering Incorporated
• Inventors: SCAPA, James R., IVEY, John, SIMON, David L.
• Granted Patent: US 8,541,958 B2
• Time in Patent Office: Days
• US Class Current: 315/176
• CPC Class Codes: F21K 9/27 Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes
• CPC Class Codes: F21S 9/04 the power supply being a generator
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2113/20 of different form
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: F21Y 2115/15 Organic light-emitting diodes [OLED]
• CPC Class Codes: H05B 45/3574 Emulating the electrical or functional characteristics of incandescent lamps
• CPC Class Codes: H10N 10/00 Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects integrated devices or assemblies of multiple devices H10N19/00

Abstract

An LED based light and a method of providing power to the LED are disclosed. The LED based light includes at least one LED and at least one thermoelectric generator having a first side and a second side. The first side is thermally coupled to the at least one LED such that heat generated by the at least one LED is conducted to the at least one thermoelectric generator, producing a temperature differential between the first side and second side. The at least one thermoelectric generator is configured to produce electrical energy from the temperature differential.

Claims

1. An LED based light comprising:

at least one LED; and

at least one thermoelectric generator having a first side and a second side, wherein the first side is thermally coupled to the at least one LED such that heat generated by the at least one LED is conducted to the at least one thermoelectric generator, producing a temperature differential between the first side and second side, wherein the at least one thermoelectric generator is configured to produce electrical energy from the temperature differential.

2. The LED based light of claim 1, wherein the at least one thermoelectric generator has an electrical connection to the at least one LED, wherein the electrical energy produced by the at least one thermoelectric generator is provided to the at least one LED.

3. The LED based light of claim 2, wherein the electrical energy produced by the at least one thermoelectric generator is voltage.

4. The LED based light of claim 2, wherein the at least one thermoelectric generator is electrically connected in series with the at least one LED.

5. The LED based light of claim 1, wherein the at least one LED is a plurality of LEDs and the at least one thermoelectric generator is a plurality of thermoelectric generators, each of the plurality of LEDs being thermally coupled to a respective one of the plurality of thermoelectric generators.

6. The LED based light of claim 1, wherein the at least one thermoelectric generator is a plurality of thermoelectric generators electrically connected to each other in series.

7. The LED based light of claim 1 further comprising:

a heat sink adjacent to the second side of the at least one thermoelectric generator and configured to increase the temperature differential between the first side and the second side.

8. The LED based light of claim 7, wherein the heat sink is disposed in thermally conductive relation to the second side of the at least one thermoelectric generator.

9. The LED based light of claim 8, wherein the at least one thermoelectric generator is disposed in thermally conductive relation to the at least one LED, and the at least one thermoelectric generator is disposed between the at least one LED and the heat sink.

10. An LED based light for use in a conventional lighting fixture comprising:

a circuit board;

at least one LED mounted on the circuit board and configured to receive electrical energy from a power source;

at least one thermoelectric generator configured to generate an electrical energy in response to heat received from the at least one LED; and

a power converter circuit connected to the power source and configured to electrically connect the least one thermoelectric generator to the least one LED and to power the at least one LED with the electrical energy provided by the at least one thermoelectric generator.

11. The LED based light of claim 10, wherein the at least one thermoelectric generator includes a first side and a second side and is configured to produce an electrical energy from a temperature differential between the first side and the second side, wherein the electrical energy produced is a voltage.

12. The LED based light of claim 10, wherein the at least one LED is a plurality of LEDs and the at least one thermoelectric generator is a plurality of thermoelectric generators, each of the plurality of thermoelectric generators in thermally conductive relation with a respective LED.

13. The LED based light of claim 11 further comprising:

a heat sink in thermally conductive relation with one of the first side and the second side of the at least one thermoelectric generator, wherein the at least one LED is in thermally conductive relation with an other of the first side and the second side, the heat sink configured to increase the temperature differential between the first side and the second side.

14. The LED based light of claim 10 further comprising:

a housing including a light transmitting portion, the circuit board being disposed within the housing.

15. The LED based light of claim 14, wherein the housing extends along a longitudinal axis of the light and includes a first end opposing a second end, the first and second ends each including a bi-pin end cap configured for at least physical engagement with a conventional fluorescent light fixture.

16. The LED based light of claim 15, wherein the housing has one of a cylindrical cross section or a semi-cylindrical cross section.

17. The LED based light of claim 13 further comprising:

a base defining a mounting platform for mounting the circuit board;

a light transmitting cover adjacent to the base and enclosing the at least one LED; and

a connector configured for at least physical engagement with a conventional incandescent light fixture.

18. The LED based light of claim 17 wherein the base includes the heat sink.

19. The LED based light of claim 10, wherein the power converter circuit comprises a thermoelectric generator conversion circuit and an LED power input circuit, wherein the electrical energy from the at least one thermoelectric generator is converted in the thermoelectric generator conversion circuit and provided to the LED power input circuit to power the at least one LED.

20. A method of providing power to an LED in an LED based light comprising:

supplying power provided by a power source to at least one LED;

converting heat generated by the at least one LED to electrical energy with at least one thermoelectric generator in thermally conductive relation with the at least one LED;

electrically connecting the at least one thermoelectric generator to the least one LED; and

supplying the electrical energy to the at least one LED from the electrically connected at least one thermoelectric generator to supplement the power supplied by the power source.

21. The method of claim 20, wherein the electrical energy is a voltage and the at least one thermoelectric generator is a plurality of thermoelectric generators, the method further comprising:

electrically connecting the plurality of thermoelectric generators in series.

22. The method of claim 20, wherein the electrical energy is voltage, the method further comprising:

providing a power conversion circuit configured to condition the voltage prior to supplying the voltage to the at least one LED.