GAS-DISCHARGE LAMP REPLACEMENT WITH PASSIVE COOLING

• US 20100277082A1
• Filed: 04/29/2010
• Published: 11/04/2010
• Est. Priority Date: 05/01/2009
• Status: Active Grant

• Current Assignee: Express Imaging Systems, LLC
• Original Assignee: Express Imaging Systems, LLC
• Inventors: Reed, William G., Renn, John O.
• Granted Patent: US 8,926,139 B2
• Time in Patent Office: Days
• US Class Current: 315/159
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• CPC Class Codes: F21V 23/04 the elements being switches safety devices F21V25/00
• CPC Class Codes: F21V 23/0442 activated by means of a sensor, e.g. motion or photodetectors
• CPC Class Codes: F21V 23/0478 by means of an image recording device, e.g. a camera
• CPC Class Codes: F21V 29/773 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 29/89 Metals
• CPC Class Codes: F21Y 2103/33 annular
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 45/385 using flyback topology
• CPC Class Codes: H05B 47/125 by using cameras
• CPC Class Codes: H05B 47/13 by using passive infrared detectors
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
• CPC Class Codes: Y02B 20/40 Control techniques providing energy savings, e.g. smart controller or presence detection
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

An illumination device comprises a solid-state lighting device and a heat sink. The heat sink is configured to be attachable to a fixture for a gas-discharge lamp to retrofit existing gas-discharge fixtures. The heat sink is conductively thermally coupled to the solid-state lighting device to dissipate heat generated by the solid-state lighting device.

Claims

1. An illumination device, comprising:

a solid-state lighting device; and

a heat sink configured to be attachable to a fixture for a gas-discharge lamp, the heat sink physically attached and conductively thermally coupled to the solid-state lighting device to dissipate heat generated by the solid-state lighting device.

2. The illumination device of claim 1 wherein the heat sink includes a plurality of protrusions.

3. The illumination device of claim 2 wherein the plurality of protrusions comprises a plurality of fins having a total exposed surface area equal to or greater than an area of 30 square centimeters per Watt (cm²/Watt) times a maximum Wattage rating of the lighting device, the total exposed surface area comprising a cumulative area of the surfaces of the fins that provide convective and/or radiative heat transfer.

4. The illumination device of claim 1 wherein the solid-state lighting device includes:

at least one light-emitting diode (LED); and

a base plate on which the at least one LED is mounted.

5. The illumination device of claim 4 wherein the heat sink has a total exposed surface area sufficient to convectively and/or radiatively dissipate heat generated by the at least one LED to maintain a temperature on the base plate proximate where the at least one LED is located to be no more than 20 degrees Celsius (°

C.) above an ambient temperature.

6. The illumination device of claim 4 wherein the solid-state lighting device further includes:

an electronic ballast to regulate electrical power supplied to the LED.

7. The illumination device of claim 6 wherein the electronic ballast comprises a switch-mode flyback current regulator.

8. The illumination device of claim 4 wherein the solid-state lighting device further includes:

a lamp base sized and dimensioned to be detachably received in a lamp socket of the fixture that is configured to receive a gas-discharge lamp, the lamp base to provide electrical power from power mains to the solid-state lighting device when received in the lamp socket that is electrically coupled to the power mains.

9. The illumination device of claim 4 wherein the solid-state lighting device further includes:

a light transmissive cover mountable to the base plate.

10. The illumination device of claim 9 wherein the light transmissive cover includes at least one optical refractor that directs light emitted from the at least one LED into a National Electrical Manufacturers Association (NEMA) butterfly pattern.

11. The illumination device of claim 9 wherein the light transmissive cover is at least optically refractive or optically reflective.

12. The illumination device of claim 1, further comprising:

a sensor switch device that senses an ambient characteristic indicative of a presence, the sensor switch device coupled to control operation of the solid-state lighting device based on the sensed ambient characteristic.

13. The illumination device of claim 12 wherein the sensing device comprises a motion activated sensor.

14. The illumination device of claim 12 wherein the sensor switch device comprises a passive infrared (PIR) detector.

15. The illumination device of claim 12 wherein the sensor switch device includes:

a solid-state camera operable to capture images of an area over a period of time; and

a controller coupled to process the captured images from the solid-state camera and control operation of the solid-state lighting device based on the captured images.

16. The illumination device of claim 12 wherein the sensor switch device controls an intensity of illumination by the solid-state lighting device based on the sensed ambient characteristic.

17. An illumination device, comprising:

a lighting device, the lighting device including a lamp base that is receivable in a lamp socket of a fixture configured to receive a gas-discharge lamp to receive power through the lamp socket of the fixture; and

a heat sink having a first end physically attachable to the fixture and a second end conductively thermally coupled to the lighting device to dissipate heat generated by the lighting device.

18. The illumination device of claim 17 wherein the lighting device includes:

a plurality of solid-state light emitters; and

a base plate on which the solid-state light emitters are mounted, the base plate physically attachable to the heat sink to conductively transfer heat from the solid-state light emitter to the heat sink.

19. The illumination device of claim 18 wherein the plurality of solid-state light emitters comprises a plurality of light-emitting diodes (LEDs).

20. The illumination device of claim 18 wherein the lighting device further includes:

an electronic ballast that regulates power supplied to the solid-state light emitters.

21. The illumination device of claim 17 wherein the heat sink includes at least one fastener to allow the heat sink to be detachably mounted on the fixture that is configured to receive a gas-discharge lamp.

22. The illumination device of claim 17 wherein the heat sink includes a plurality of fins.

23. The illumination device of claim 22 wherein the plurality of fins comprises a plurality of die-cast fins.

24. The illumination device of claim 22 wherein the plurality of fins comprises a plurality of stamp metal plates.

25. The illumination device of claim 17 wherein the heat sink has a total exposed surface area equal to or greater than an area of 30 square centimeters per Watt (cm²/Watt) times a maximum Wattage rating of the lighting device.

26. The illumination device of claim 18 wherein the heat sink has a total exposed surface area sufficient to dissipate heat generated by the lighting device to maintain a temperature on the base plate proximate the solid-state light emitter be no more than 20 degrees Celsius (°

C.) above an ambient temperature.

27. The illumination device of claim of claim 17, further comprising:

a control device controllingly coupled to the lighting device to control operation of the lighting device.

28. The illumination device of claim 27 wherein the control device comprises a motion sensor to detect motion.

29. The illumination device of claim 27 wherein the control device comprises a passive infrared (PIR) detector to detect heat.

30. The illumination device of claim 27 wherein the control device comprises:

a solid-state camera capturing images of an area; and

a processor coupled to receive and process the captured images from the solid-state camera and filter coupled to control operation of the solid-state lighting device based on the captured images.

31. The illumination device of claim 27 wherein the control device controls an intensity of illumination by the lighting device based on a sensed ambient characteristic.