Light Emitting Diode Packages

• US 20070247847A1
• Filed: 04/21/2006
• Published: 10/25/2007
• Est. Priority Date: 04/21/2006
• Status: Active Grant

• Current Assignee: Creeled Incorporated
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Villard, Russell
• Granted Patent: US 7,648,257 B2
• Time in Patent Office: Days
• US Class Current: 362/249.10
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• 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 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/14 using electrical feedback from LEDs or from LED modules
• CPC Class Codes: H05B 45/40 Details of LED load circuits

Abstract

Lighting packages are described for light emitting diode (LED) lighting solutions having a wide variety of applications which seek to balance criteria such as heat dissipation, brightness, and color uniformity. The present approach includes a backing of thermally conductive material and two or more arrays of LEDs attached to a printed circuit board (PCB). The PCB is attached to the top surface of the backing and the two or more arrays of LEDs are separated by a selected distance to balance heat dissipation and color uniformity of the LEDs.

Claims

1. A package of light emitting diodes (LEDs) comprising:

a backing of thermally conductive material; and

two or more arrays of LEDs, each array mounted to a printed circuit board (PCB), the PCBs for the two or more arrays attached to the top surface of the backing, said two or more arrays of LEDs separated by a selected distance to balance heat dissipation and color uniformity of the LEDs.

2. The package of claim 1 wherein the backing of thermally conductive material is a planar sheet of aluminum.

3. The package of claim 1 wherein the top surface of the backing has a white color.

4. The package of claim 1 wherein the package dimensions is 1 foot by 1 foot.

5. The package of claim 1 wherein the two or more arrays of LEDs spaced less than or equal to d inches apart where d is approximately equal to 2*(1.25/tan((180−

α

)/2)) and α

is the angle of intensity of an LED.

6. The package of claim 5 wherein the two or more arrays of LEDs are electrically connected in parallel.

7. The package of claim 5 wherein the two or more arrays of LEDs where the LEDs operate around 350 mAmps of input current and consume approximately 1 Watt of power.

8. The package of claim 5 wherein the backing comprises two or more strips of aluminum attached to two support members, the two or more arrays of LEDs attached to the upper surfaces of the two or more strips of aluminum.

9. The package of claim 5 wherein the backing comprises two or more T-shaped aluminum bars attached to two support members, the two or more arrays of LEDs attached to the upper surfaces of the two or more T-shaped aluminum bars.

10. A module of light emitting diodes (LEDs) comprising:

a plurality of LEDs;

a T-shaped bar composed of thermally conductive material; and

a printed circuit board (PCB) having the plurality of LEDs attached thereto, the PCB being attached to the upper surface of the T-shaped bar to dissipate heat generated from the plurality of LEDs.

11. The module of claim 10 wherein the T-shaped bar is anodized black aluminum.

12. The module of claim 10 further comprising:

an L-shaped bar having two inner surfaces and a lower outer surface, the T-shaped bar attached to the two inner surfaces of the L-shaped bar.

13. The module of claim 12 further comprising:

a plate; and

a hinge having a top and bottom outer surface, the bottom surface of the L-shaped bar attached to the top outer surface of the hinge, the bottom outer surface of the hinge attached to the plate allowing the T-shaped bar to rotate about the axis of the hinge.

14. A control system for controlling a plurality of light emitting diode (LED) lighting packages comprising:

a potentiometer;

a plurality of direct current (DC) power supplies, each DC power supply having an analog control port and a positive output terminal, the potentiometer connecting to the analog control ports; and

a control relay switch connecting the positive output terminals to the plurality of LED lighting packages and controlling whether a portion of the plurality of LED lighting packages are powered by the plurality of DC power supplies at any one time, wherein adjustment of the potentiometer results in a simultaneous brightness adjustment to the portion of the plurality of LED lighting packages connected through the control relay.

15. The control system of claim 14 further comprising:

a computer coupled to the potentiometer to control the brightness the portion of the plurality of LED lighting packages.

16. The control system of claim 15 wherein the computer further coupled to the control relay switch to control the powering of the portion of the plurality of LED lighting packages.

17. The control system of claim 16 wherein the computer plays music and controls the brightness and powering of the portion of the plurality of LED light packages to match the beat of the played music.