LED fixture with integrated driver circuitry

• US 9,310,038 B2
• Filed: 03/06/2013
• Issued: 04/12/2016
• Est. Priority Date: 03/23/2012
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Athalye, Praneet Jayant
• Primary Examiner(s): Hanley, Britt D
• Application Number:
  US13/787,727
• Publication Number:
  US 20130250579A1
• Time in Patent Office: 1,133 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: F21S 8/026 intended to be recessed in a ceiling or like overhead structure, e.g. suspended ceiling
• CPC Class Codes: F21S 8/04 intended only for mounting on a ceiling or the like overhead structures F21S8/02 takes precedence; details of ceiling bases F21V21/03
• CPC Class Codes: F21V 21/00 Supporting, suspending, or attaching arrangements for lighting devices F21V17/00, F21V19/00 take precedence; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q, stands for supporting apparatus or articles in general F16M11/00; Hand grips
• CPC Class Codes: F21V 21/044 with elastically deformable elements, e.g. spring tongues
• CPC Class Codes: F21V 21/047 Mounting arrangements with fastening means engaging the inner surface of a hole in a ceiling or wall, e.g. for solid walls or for blind holes
• CPC Class Codes: F21V 23/005 the substrate is supporting also the light source
• CPC Class Codes: F21V 23/023 Power supplies in a casing F21V23/003 takes precedence
• CPC Class Codes: F21V 29/15 Thermal insulation
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21V 3/04 characterised by materials, surface treatments or coatings
• CPC Class Codes: F21V 7/0066 specially adapted to cooperate with point like light sources; specially adapted to cooperate with light sources the shape of which is unspecified F21V7/16 - F21V7/30 take precedence
• CPC Class Codes: F21V 7/041 with conical or pyramidal surface
• CPC Class Codes: F21V 7/24 characterised by the material
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/38 using boost topology

Abstract

A solid state lighting fixture with an integrated driver circuit. A housing has a base end and an open end through which light is emitted from the fixture. The reflective interior surface of the fixture and the base define an optical chamber. At least one, and often multiple, light sources are mounted at the fixture base along with the circuitry necessary to drive and/or control the light sources. The drive circuit and the light sources are both located in the optical chamber. A reflective cone fits within the optical chamber such that it covers most of the drive circuit and other components at the base of fixture that might absorb light. The reflective cone is shaped to define a hole that is aligned with the light sources so that light may be emitted through the hole toward the open end of the fixture.

Claims

1. A lighting device, comprising:

a housing comprising;

a base;

an open end opposite said base;

an exterior surface; and

an interior surface of said housing opposite said exterior surface and shaped to define an internal optical chamber, at least a portion of said interior surface being reflective and shaped to redirect light out of said open end;

at least one LED in said internal optical chamber; and

a reflector cone in said internal optical cavity chamber, said reflector cone shaped to define a hole that aligns with said at least one LED;

wherein at least some light from said at least one LED is reflected by an interior surface of said reflector cone and said interior surface of said housing.

2. The lighting device of claim 1, further comprising a driver circuit in said internal optical chamber.

3. The lighting device of claim 1, wherein said LEDs protrude through said reflector cone hole into said internal optical chamber.

4. The lighting device of claim 1, further comprising a junction box detachably mounted to said housing base.

5. The lighting device of claim 4, said junction box comprising a mount mechanism for mounting to an external surface.

6. The lighting device of claim 2, said driver circuit comprising an AC to DC converter and a DC to DC converter.

7. The lighting device of claim 2, said driver circuit comprising a boost converter.

8. The lighting device of claim 2, said driver circuit comprising a step-down converter.

9. The lighting device of claim 2, said driver circuit comprising a buck-boost converter.

10. The lighting device of claim 2, wherein said at least one LED and said driver circuit are on a circuit board which is mounted to said base.

11. The lighting device of claim 2, wherein said at least one LED is on a first board and said driver circuit is on a second board.

12. The lighting device of claim 11, wherein said second board is stacked on said first board with a spacer there between, and wherein said at least one LED protrudes through said second board and into said internal optical cavity chamber.

13. The lighting device of claim 2, wherein said at least one LED is in the middle region of a circular circuit board and said driver circuit is arranged around the outer region of said circuit board.

14. The lighting device of claim 1, wherein said housing comprises a raised mount surface in the center of said base defining a circular cavity around said raised mount surface.

15. The lighting device of claim 2, wherein said at least one LED and said driver circuit are at said base of said housing.

16. A lighting device, comprising:

a housing comprising;

a base;

an open end opposite said base; and

an interior surface of said housing shaped to define an internal optical chamber, at least a portion of said interior surface being reflective and shaped to redirect light out of said open end;

at least one light source in said optical chamber; and

a reflector in said internal optical chamber, said reflector shaped to create a smooth surface transition at the intersection with the interior surface of the housing, said reflector shaped to define a hole that aligns with said at least one light source;

wherein at least some light from said at least one light source is reflected by an interior surface of said reflector and said interior surface of said housing.

17. The lighting device of claim 16, said at least one light source comprising at least one LED in said internal optical chamber.

18. The lighting device of claim 16, further comprising:

a driver circuit in said internal optical chamber; and

a junction box detachably connected to said base, said junction box comprising a mount structure for mounting said lighting device to an external surface.

19. The lighting device of claim 16, wherein said at least one light source protrudes through said reflector hole into said internal optical chamber.

20. The lighting device of claim 18, wherein said at least one light source and said driver circuit are on a circuit board which is mounted to said base.

21. The lighting device of claim 18, wherein said at least one light source is on a first board and said driver circuit is on a second board.

22. The lighting device of claim 21, wherein said second board is stacked on said first board with a spacer there between, and wherein said at least one light source protrudes through said second board and into said internal optical cavity chamber.

23. The lighting device of claim 18, wherein said at least one light source is in the middle region of a circular circuit board and said driver circuit is arranged around the outer region of said circuit board.

24. The lighting device of claim 18, said driver circuit comprising an AC to DC converter and a DC to DC converter.

25. The lighting device of claim 18, said driver circuit comprising a boost converter.

26. The lighting device of claim 18, said driver circuit comprising a step-down converter.

27. The lighting device of claim 18, said driver circuit comprising a buck-boost converter.