Multiple use LED light fixture

• US 20100014289A1
• Filed: 05/18/2009
• Published: 01/21/2010
• Est. Priority Date: 06/13/2007
• Status: Active Grant

• Current Assignee: Electraled Incorporated
• Original Assignee: Electraled Incorporated
• Inventors: Warner, Bryan T., Thomas, James, Gatesman, Gary, Mosier, Jim, Lynd, David
• Granted Patent: US 8,235,555 B2
• Time in Patent Office: Days
• US Class Current: 362/235
• CPC Class Codes: F21K 9/69 Details of refractors forming part of the light source
• CPC Class Codes: F21S 2/005 of modular construction
• CPC Class Codes: F21V 15/01 Housings, e.g. material or assembling of housing parts F21V15/02 takes precedence housings forming signs or letters G09F13/04
• CPC Class Codes: F21V 19/003 Fastening of light source holders, e.g. of circuit boards or substrates holding light sources
• CPC Class Codes: F21V 21/30 Pivoted housings or frames
• 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 23/023 Power supplies in a casing F21V23/003 takes precedence
• CPC Class Codes: F21V 23/026 Fastening of transformers or ballasts
• CPC Class Codes: F21V 29/15 Thermal insulation
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 29/75 with fins or blades having different shapes, thicknesses or spacing
• CPC Class Codes: F21V 29/763 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 29/767 the planes containing the fins or blades having directions perpendicular to the light emitting axis
• 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 31/03 with provision for venting for vehicle head lights F21S45/33; for vehicle rear lights F21S41/192
• CPC Class Codes: F21W 2131/10 Outdoor lighting
• CPC Class Codes: F21W 2131/40 Lighting for industrial, commercial, recreational or military use
• CPC Class Codes: F21W 2131/402 for working places
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

The invention provides a multi-use light fixture that includes a light engine, a rugged housing, and an external power supply removeably embedded within an optional external enclosure. The light fixture includes several novel heat management features designed to reduce the risk of failure and thereby increase the reliability of the light fixture. The light engine includes groups of light modules, each having a light emitting diode (LED) and a zener diode. The housing includes an internal gap defined between the a circuit board and the housing. The housing also includes an arrangement of external fins and vents that dissipate heat generated by the light engine. The lens cover includes a plurality of inlets to supply ambient air into the fixture. During operation, heat is generated by the light modules, namely the LEDs, and then is transferred along a first flow path through a main body portion of the housing and the fins for dissipation to ambient and a second air flow path whereby ambient air flows through the light engine to increase the performance and efficiency of the light engine.

Claims

1. An LED light fixture connectable to an elongated track, the light fixture comprising:

a housing having a circular body portion and a spindle extending rearward from the body portion, the housing further having a plurality of tapered fins extending from the body portion along the spindle, the housing further having at least one vent in the body portion;

a light engine assembly mounted to the main body portion, the light engine having a plurality of light modules comprising a light emitting diode (LED) mounted to a printed circuit board (PCB), the PCB having a circular periphery that is less than the periphery of the body portion to define an internal gap between the PCB and the body portion;

a front lens affixed to a flange of the housing, the front lens having at least one central inlet;

wherein an air flow path is defined through the central inlet, across the light modules, through the internal gap and out the vent, whereby air flows along the path during operation of the light fixture.

2. The light fixture of claim 1, wherein the light module further comprises a zener diode mounted to the PCB.

3. The light fixture of claim 1, wherein the spindle has at least one internal passageway that receives supply leads extending between the power supply and the circuit board.

4. The light fixture of claim 1, wherein the tapered fins extending from the body portion along the spindle are tapered in height.

5. The light fixture of claim 1, wherein the light module further comprises a lens mounted to the PCB and surrounding the LED.

6. The light fixture of claim 1, wherein a plurality of vents in the body portion are arrayed circumferentially around the spindle.

7. The light fixture of claim 6, wherein the plurality of vents are positioned between the leading edge of the fins.

8. The light fixture of claim 1, further having a heat transfer element positioned between the circuit board and the body portion.

9. The light fixture of claim 1, wherein the housing is formed from aluminum or a similarly performing thermally conductive polymer.

10. The light fixture of claim 1, wherein the housing has a flange that defines an inwardly extending receiver that provides a primary mounting surface for the light engine.

11. The light fixture of claim 1, wherein the light engine comprises an outer ring of twelve modules and an inner ring of six modules offset from the outer ring of twelve modules to facilitate a uniform light pattern and uniform heat generation.

12. The light fixture of claim 1, wherein during operation, a junction temperature of the LED at the PCB is 65°

C., a body temperature of the housing is 65°

C., the ambient temperature is 25°

C., and the temperature of the power supply is 40°

C.

13. The light fixture of claim 1, wherein the lens of the light module is chosen from at least one of a narrow, medium and wide beam lens.

14. The light fixture of claim 1, further comprising a mounting bracket extending from the housing to a track connector assembly.

15. The light fixture of claim 14, wherein a protrusion incorporated into a fin at the body portion extends radially outward, the protrusion configured for securement with the mounting bracket.

16. The light fixture of claim 14, further comprising a power module secured to the mounting bracket, the power module including a power supply residing within an enclosure.

17. The light fixture of claim 1, wherein during operation heat generated by the LEDs passes through the circuit board into the fins for dissipation to ambient.

18. An LED track light system comprising:

an elongated track with at least one copper bus wire;

an LED light fixture connectable to the elongated track, the fixture comprising;

a housing having a body portion and a spindle extending rearward from the body portion, the housing further having a plurality of tapered fins extending from the body portion along the spindle, the housing further having at least one vent in the body portion residing between a pair of fins;

a light engine assembly mounted to the main body portion, the light engine having a plurality of light modules comprising a light emitting diode (LED) mounted to a printed circuit board (PCB), the PCB having a periphery that is less than the periphery of the body portion to define an internal gap between the PCB and the body portion;

a front lens affixed to a flange of the housing, the front lens having at least one central inlet;

wherein an air flow path is defined through the central inlet, across the light modules, through the internal gap and out the vent, whereby air flows through the light fixture and along the path during operation.

a power module mounted to a mounting bracket, the power module including a power supply and a power supply enclosure box; and

,

a connector assembly to operably secure the mounting bracket to the elongated track.

19. The light fixture of claim 18, wherein the light engine assembly further comprises a zener diode mounted to the printed circuit board (PCB).

20. The light fixture of claim 18, wherein the tapered fins extending from the body portion along the spindle are tapered in height.

21. The light fixture of claim 18, wherein the tapered fins extending from the body portion along the spindle are tapered in thickness.

22. The light fixture of claim 18, wherein a plurality of vents in the body portion are arrayed circumferentially around the spindle.

23. The light fixture of claim 18, wherein the light engine comprises an outer ring of twelve light emitting diodes and an inner ring of six light emitting diodes offset from the outer ring of twelve light emitting diodes to facilitate a uniform light pattern and uniform heat generation.

24. An LED light fixture comprising:

a housing having a circular body portion and a plurality of tapered fins extending from the body portion, the housing further having a plurality of vents in the body portion;

a light engine assembly mounted to the main body portion, the light engine having a plurality of light modules comprising a LED and an optical lens mounted to a printed circuit board (PCB), the light modules arranged in an inner ring and a concentric outer ring, the PCB having a circular periphery that is less than the periphery of the body portion to define an internal gap between the PCB and the body portion;

a front lens affixed to a flange of the housing, the front lens having at least one central inlet;

wherein an air flow path is defined through the central inlet, across the light modules, through the internal gap and out the vent, whereby air flows through the light fixture and along the path during operation.

25. The light fixture of claim 24, wherein the light engine assembly has a zener diode mounted to the printed circuit board (PCB).

26. The light fixture of claim 24, wherein the housing has a spindle extending rearward from the body portion.

27. The light fixture of claim 24, wherein the light engine comprises an outer ring of twelve modules and an inner ring of modules offset from the outer ring of twelve modules to facilitate a uniform light pattern and uniform heat generation.