LED LIGHT WITH ACTIVE COOLING

• US 20070139938A1
• Filed: 02/20/2007
• Published: 06/21/2007
• Est. Priority Date: 03/31/2003
• Status: Active Grant

• Current Assignee: Lumination LLC
• Original Assignee: Lumination LLC
• Inventors: Arik, Mehmet, Petroski, James
• Granted Patent: US 7,556,406 B2
• Time in Patent Office: Days
• US Class Current: 362/373
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21K 9/233 specially adapted for generating a spot light distribution, e.g. for substitution of reflector lamps
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21V 23/02 the elements being transformers, impedances or power supply units, e.g. a transformer with a rectifier
• CPC Class Codes: F21V 29/63 using electrically-powered vibrating means; using ionic wind
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21V 3/12 the coatings comprising photoluminescent substances
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 23/467 by flowing gases, e.g. air H01L23/473 takes precedence
• CPC Class Codes: H01L 23/473 by flowing liquids H01L23/4332, H01L23/4338 take precedence
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

An LED lamp that includes a piezoelectric fan or synthetic jet to cool component of the lamp is disclosed.

Claims

1. A lamp system comprising:

a housing;

a plurality of LEDs;

a heat sink connected to the housing and in thermal communication with the plurality of LEDs;

a flexible blade connected to the housing and having a free end spaced from a surface of the heat sink, the blade being moveable to generate a fluid current to cool the heat sink;

an electronic actuator operatively associated with the blade for providing a force to oscillate the blade; and

circuitry connected to the LEDs and the electronic actuator, the circuitry configured to receive source power from a source to deliver a first power to the electronic actuator and a second power to the plurality of LEDs.

2. The system of claim 1, wherein the electronic actuator comprises a piezoelectric material attached to the blade.

3. The system of claim 1, further comprising a magnet connected at or adjacent the free end of the blade, and wherein the electronic actuator comprises a coil.

4. The system of claim 1, wherein the first power includes AC voltage and the second power includes DC voltage.

5. The system of claim 1, wherein the circuitry is located in a module connected to the housing.

6. The system of claim 1, wherein the circuitry is located, in a module that is spaced from the housing.

7. The system of claim 1, wherein the housing is made from a heat dissipating material having a thermal conductivity greater than 20 W/m K so that the housing acts as a heat dissipating structure along with the heat sink.

8. The system of claim 1, further comprising a printed circuit board, the LEDs being mounted to the printed circuit board and the circuitry being in electrical communication with the printed circuit board.

9. The system of claim 6, wherein the printed circuit board includes a heat dissipating material having a thermal conductivity greater than 50 W/m K.

10. The system of claim 1, wherein the plurality of LEDs mount adjacent a first surface of the heat sink and are configured to direct light away from the first surface and the flexible blade being arranged so as not to obstruct light emanating from the plurality of LEDs.

11. A lamp comprising:

a frame;

a support connected to the frame and including circuitry;

a plurality of LEDs attached to the support for receiving power from the circuitry, the LEDs being arranged to generate a beam pattern;

a heat sink contacting the support, wherein the LEDs transfer heat into the heat sink; and

a flexible blade arranged with respect to the heat sink for oscillatory movement where the blade does not interrupt the beam pattern that is generated by the plurality of LEDs; and

an electronic actuator operatively associated with the blade for causing back and forth movement of the blade.

12. The lamp of claim 11, further comprising a power control module in electrical communication with the circuitry of the support and the electronic actuator, the power control module receiving a source power and converting the source power to deliver a lower voltage power to the plurality of LEDs.

13. The lamp of claim 12, wherein the power control module is connected to the frame.

14. The lamp of claim 12, wherein the power control module delivers a lower voltage DC power to the LEDs and the power control module is also configured to deliver AC power to the electronic actuator.

15. The lamp of claim 14, wherein the electronic actuator comprises a piezoelectric material in contact with the blade.

16. The lamp of claim 14, further comprising a magnet attached to the blade.

17. The lamp of claim 16, wherein the electronic actuator comprises a coil.

18. The lamp of claim 11, wherein the plurality of LEDs are housed in a single package.

19. The lamp of claim 11, wherein each of the LEDs comprises a die mounted directly on the support.

20. The lamp of claim 11, wherein the frame is substantially closed having a fluid inlet and a fluid outlet.

21. The lamp of claim 20, wherein the fluid inlet and the fluid outlet are each covered by a filter.

22. A lamp comprising:

an enclosure including a translucent portion;

an electrical connector attached to the enclosure, the connector being configured to electrically connect to an external power source;

an LED disposed in the enclosure and in electrical communication with the electrical connector;

a blade disposed in the enclosure and arranged to move back and forth to generate a current to cool the LED; and

a electronic actuator in electrical communication with the electrical connector and operatively associated with the blade for inducing back and forth movement of the blade.

23. The lamp of claim 22, wherein the enclosure includes a vent through which fluid is able to flow.

24. The lamp of claim 23, wherein the enclosure includes at least two vents.

25. The lamp of claim 24, wherein each vent is covered by a filter.

26. The lamp of claim 22, wherein at least a portion of the enclosure is coated with a phosphor material.

27. The lamp of claim 22, wherein the electrical connector includes an Edison base.

28. The lamp of claim 22, wherein the electronic actuator comprises a piezoelectric material.

29. The lamp of claim 22, further comprising a magnet attached to the blade and wherein the electronic actuator comprises a coil.

30. The lamp of claim 22, further comprising power conditioning electronics in electrical communication with the electronic actuator, the LED and the electrical connector, the power conditioning electronics being configured to convert a higher voltage power from the electrical connector and into a lower voltage power that is delivered to the LED.

31. The lamp of claim 22, further comprising a heat sink in thermal communication with the LED, the blade being arranged with respect to the heat sink to generate a current over a surface of the heat sink.