Compact A.C. Powered LED Light Fixture

• US 20170138578A1
• Filed: 11/13/2015
• Published: 05/18/2017
• Est. Priority Date: 11/13/2015
• Status: Active Grant

• Current Assignee: Korrus Incorporated (MKD Electric, Inc.)
• Original Assignee: Tempo Industries, LLC
• Inventors: Pearson, Dennis, Bremser, Michael D., Barton, Dennis, Johnson, James, Lueken, Thomas, Chov, Heng
• Granted Patent: US 9,784,441 B2
• Time in Patent Office: Days
• CPC Class Codes: F21S 4/28 rigid, e.g. LED bars
• CPC Class Codes: F21V 23/002 Arrangements of cables or conductors inside a lighting device, e.g. means for guiding along parts of the housing or in a pivoting arm
• CPC Class Codes: F21V 23/005 the substrate is supporting also the light source
• CPC Class Codes: F21V 23/006 the substrate being distinct from the light source holder
• 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 23/06 the elements being coupling devices , e.g. connectors
• CPC Class Codes: F21Y 2101/00 Point-like light sources
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A compact LED light fixture includes an LED circuit board whose top surface mounts one or more LED'"'"'s and an A.C. LED Driver circuit. An input circuit board is mounted on an underside of the mounting platform. Unconditioned A.C. power from electrical cables positioned in a wire way is conducted by an electrical connector to the top surface the LED circuit board, then across and down through the top surface of the LED circuit board to the input circuit board where the A.C. power is conditioned and then conducted back through the LED circuit board to the A.C. LED driver.

Claims

1. An LED light fixture comprising:

a wireway having first and second sides and a bottom surface defining a channel for receiving at least first and second electrical cables;

a circuit board mounting platform configured to be received and supported by said wireway;

a first circuit board carrying one or more LED'"'"'s and an A.C. LED Driver circuit, the first circuit board being mounted on said circuit board mounting platform;

an input circuit board located in said wireway beneath said first circuit board, the input circuit board comprising circuitry configured to receive an unconditioned A.C. line signal and convert the unconditioned A. C. line signal to a conditioned A.C. line signal suitable for supply to said A.C. LED driver circuit;

a first electrical connector configured to conduct unconditioned A.C. power from said first and second cables to first and second electrically conductive power pins positioned to supply power to a top surface of said first circuit board; and

a first electrical conductor path for conducting said unconditioned A.C. power across said first circuit board and down and through said first circuit board to said input circuit board.

2. The LED light fixture of claim 1 further comprising a second electrical conductor path for conducting the conditioned A.C. line signal from said input circuit board to said A.C. LED Driver circuit.

3. The LED light fixture of claim 2 wherein said input circuit board is attached to a bottom surface of said circuit board mounting platform.

4. The LED light fixture of claim 1 wherein said first electrical conductor path comprises:

a second electrical connector positioned beneath said circuit board and having third and fourth electrically conductive power pins extending through said circuit board and spaced apart from said first and second power pins;

first and second conductor traces formed on said circuit board and respectively connected at one end to said first and second power pins and at an opposite end to said third and fourth power pins;

a third electrical connector configured to mate with said second electrical connector and to supply said unconditioned A.C. power to said input circuit board.

5. The LED light fixture of claim 2 wherein said first electrical conductor path comprises:

a second electrical connector positioned beneath said first circuit board and having third and fourth electrically conductive power pins extending through said first circuit board and spaced apart from said first and second power pins;

first and second conductor traces formed on said first circuit board and respectively connected at one end to said first and second power pins and at an opposite end to said third and fourth power pins;

a third electrical connector configured to mate with said second electrical connector and to supply said unconditioned A.C. power to said input circuit board.

6. The LED light fixture of claim 2 wherein said second electrical conductor path comprises fifth and sixth electrically conductive power pins on said second electrical connector and wherein said third electrical connector is configured to receive said conditioned A.C. signal from said input circuit board.

7. The LED light fixture of claim 5 wherein said second electrical conductor path comprises fifth and sixth electrically conductive power pins on said second electrical connector and wherein said third electrical connector is configured to receive said conditioned A.C. signal from said input circuit board.

8. The LED light fixture of claim 1 wherein said circuitry comprises a diode bridge.

9. The LED light fixture of claim 8 wherein said circuitry further comprises a transorb diode and a metal oxide varistor.

10. An LED light fixture comprising:

a first circuit board carrying one or more LEDs and an A.C. LED Driver circuit on a top surface thereof;

an input circuit board beneath said first circuit board, the input circuit board comprising circuitry configured to receive an unconditioned A.C. line signal and to supply a conditioned A.C. line signal to said A.C. LED driver circuit; and

an A. C. conductor path running from a bottom surface of said first circuit board, through said first circuit board and across the top surface of said first circuit board and down through said first circuit board to an input said of said input circuit board.

11. The LED light fixture of claim 10 wherein said A. C. conductor path is connected to a source of A.C. line voltage.

12. The LED light fixture of claim 10 wherein said circuitry comprises a diode bridge.

13. The LED light fixture of claim 12 wherein said circuitry further comprises a transorb diode and a metal oxide varistor.

14. A method of constructing an LED light fixture comprising:

installing a plurality of LEDs and an A.C. LED driver on a top surface of a printed circuit board;

constructing an A. C. power conditioning circuit to convert unconditioned A. C. line power into conditioned A.C. power of a form suitable for said A.C. LED driver;

installing said A.C. power conditioning circuit at a position located beneath said printed circuit board;

tapping unconditioned A.C. power from a source of unconditioned A.C. power; and

running the unconditioned A.C. power through a bottom surface of the printed circuit board to the top surface of the printed circuit board, across the top surface of the printed circuit board, and then back down and through the printed circuit board to supply the unconditioned A.C. power to said A.C. power conditioning circuit.

15. A method of power distribution in an LED light fixture having a first printed circuit board and a plurality of LEDs mounted on a top surface of the first printed circuit board, the method comprising:

tapping unconditioned A.C. power from a source of unconditioned A.C. power; and

running the unconditioned A.C. power through a bottom surface of the first printed circuit board to the top surface of the first printed circuit board, across the top surface of the first printed circuit board, and then back down and through the first printed circuit board to a second circuit board located beneath said first printed circuit board.

16. The method of claim 15 wherein the second printed circuit board carries a power conditioning circuit.

17. The method of claim 15 further comprising running conditioned A.C. power from said A.C. power conditioning circuit up through said printed circuit board to an A.C. LED driver located on the top surface of the printed circuit board.

18. The method of claim 15 further comprising converting the unconditioned A.C. power to conditioned A.C. power.

19. The method of claim 18 further comprising running the conditioned A.C. power to an A.C. LED driver located on the top surface of the printed circuit board.