Arrangement for driving led lighting sources

• US 20070127239A1
• Filed: 11/21/2006
• Published: 06/07/2007
• Est. Priority Date: 11/22/2005
• Status: Active Grant

• Current Assignee: ABL IP Holding LLC (Acuity Brands, Inc.)
• Original Assignee: OSRAM GmbH (Ams-Osram AG)
• Inventors: Scilla, Giovanni
• Granted Patent: US 7,683,861 B2
• Time in Patent Office: Days
• US Class Current: 362/231
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/46 having LEDs disposed in parallel lines

Abstract

A driving arrangement for a plurality of light emitting diodes (LEDs), comprising a first power supply line (Vcc) and a set of signal lines (1a, 1b, 1c) for carrying brightness intensity and or chromatic information for the plurality of light emitting diodes (54), includes: a second power supply line (GND) to provide jointly with the first power supply line (Vcc) a two-wire power supply, and

• • a switching block (47) to generate switching signals to provide brightness intensity and/or chromatic information the light emitting diodes (54) via the signal lines (1a, 1b, 1c).

In a first possible configuration of use, the first (Vcc) and second (GND) power supply line jointly supply power to a processor (52) included in an “active” lighting source wherein the processor drives the light emitting diodes (54) as a function of the brightness intensity information provided to the processor via the signal lines (1a, 1b, 1c).

In a second possible configuration of use, adopted for driving “passive” sources, the second power supply line (GND) is not used, and the brightness of the light emitting diodes (54) in the source is controlled by switching signals applied thereto via the first power supply line (Vcc) and the set of signal lines (1a, 1b, 1c).

Claims

1. A driving arrangement for lighting sources including a plurality of light emitting diodes (LEDs), the arrangement including a first power supply line (Vcc) and a set of signal lines (1a, 1b, 1c) for carrying information for said plurality of light emitting diodes (RD, GD, BD), the arrangement including:

a second power supply line (GND) to provide jointly with said first power supply line (Vcc) a two-wire power supply, and

a switching block (47) to generate switching signals to provide driving information for said plurality of light emitting diodes (RD, GD, BD) via said set of signal lines (1a, 1b, 1c).

2. The driving arrangement of claim 1, characterized in that said driving information is brightness intensity information.

3. The driving arrangement claim 1 characterized in that said driving information is chromatic information.

4. The driving arrangement of claim 1 characterized in that said driving information is a combination of brightness intensity and chromatic information.

5. The combination of the driving arrangement of claim 1 and a light source (50) including a plurality of light emitting diodes (RD, GD, BD;

54) coupled to a logic power circuit (52) for driving said plurality of light emitting diodes (RD, GD, BD;

54) as a function of said brightness intensity and/or chromatic information provided by said switching signals generated by said switching block (47) and applied to said processor (52) via said set of signal lines (1a,1b,1c), wherein said first (Vcc) and second (GND) power supply lines jointly supply power to said processor (52).

6. The combination of the driving arrangement of claim 1 and a light source (40) including a plurality of light emitting diodes (RD, GD, BD) wherein the brightness of said plurality of light emitting diodes (RD, GD, BD) is controlled by said switching signals generated by said switching block (47) and applied to said plurality of light emitting diodes (RD, GD, BD) via said first (Vcc) power supply line and said set of signal lines (1a,1b,1c).

7. The combination of claim 6, wherein said plurality of light emitting diodes (RD, GD, BD) are coupled to respective current regulators (42, 44, 46).

8. The combination of claim 5, wherein said plurality of light emitting diodes (RD, GD, BD) jointly define a tricromatic lighting system.

9. The combination of claim 5, wherein said plurality of light emitting diodes (RD, GD, BD) jointly define a multichromatic lighting system

10. The combination of claim 9, wherein said plurality of light emitting diodes (RD, GD, BD) jointly define an RGB lighting system.

11. The combination of claim 9, wherein said plurality of light emitting diodes (RD, GD, BD) jointly define a tunable-white lighting system.

12. The arrangement of claim 1, wherein said set of signal lines (1a, 1b, 1c) includes three signal lines (1a, 1b, 1c).

13. The arrangement of claim 1, wherein said set of signal lines (1a, 1b, 1c) includes a number of signal lines between four to six signal lines.

14. The combination of the driving arrangement of claim 2 and a light source (40) including a plurality of light emitting diodes (RD, GD, BD) wherein the brightness of said plurality of light emitting diodes (RD, GD, BD) is controlled by said switching signals generated by said switching block (47) and applied to said plurality of light emitting diodes (RD, GD, BD) via said first (Vcc) power supply line and said set of signal lines (1a,1b,1c).

15. The combination of the driving arrangement of claim 3 and a light source (40) including a plurality of light emitting diodes (RD, GD, BD) wherein the brightness of said plurality of light emitting diodes (RD, GD, BD) is controlled by said switching signals generated by said switching block (47) and applied to said plurality of light emitting diodes (RD, GD, BD) via said first (Vcc) power supply line and said set of signal lines (1a,1b,1c).

16. The combination of claim 6, wherein said plurality of light emitting diodes (RD, GD, BD) jointly define a tricromatic lighting system.

17. The combination of claim 7, wherein said plurality of light emitting diodes (RD, GD, BD) jointly define a tricromatic lighting system.

18. The combination of claim 6, wherein said plurality of light emitting diodes (RD, GD, BD) jointly define a multichromatic lighting system

19. The combination of claim 7, wherein said plurality of light emitting diodes (RD, GD, BD) jointly define a multichromatic lighting system

20. The combination of the driving arrangement of claim 2 and a light source (50) including a plurality of light emitting diodes (RD, GD, BD;

54) coupled to a logic power circuit (52) for driving said plurality of light emitting diodes (RD, GD, BD;

54) as a function of said brightness intensity and/or chromatic information provided by said switching signals generated by said switching block (47) and applied to said processor (52) via said set of signal lines (1a,1b,1c), wherein said first (Vcc) and second (GND) power supply lines jointly supply power to said processor (52).