Method for Operating a Semiconductor Lighting Device and Color Control Device for Carrying Out the Method

• US 20130093361A1
• Filed: 06/08/2011
• Published: 04/18/2013
• Est. Priority Date: 06/15/2010
• Status: Abandoned Application

• Current Assignee: OSRAM Licht AG (Ams-Osram AG)
• Original Assignee: OSRAM Licht AG (Ams-Osram AG)
• Inventors: Bertram, Ralph, Frost, Tobias, Lorenz, Stefan
• Application Number:
  US13/704,950
• Publication Number:
  US 20130093361A1
• Time in Patent Office: Days
• US Class Current: 315/312
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/28 using temperature feedback
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

A method for operating a semiconductor lighting device, wherein the semiconductor lighting device comprises semiconductor light sources having at least two different colors and wherein, in order to adjust a color coordinate of the semiconductor lighting device, at least one brightness of the semiconductor light sources is set by means of a control and wherein the at least one brightness of the semiconductor light sources is adjusted by at least two controls, and wherein, upon reaching or exceeding at least one predetermined switchover point, a switchover is made between two of the controls.

Claims

1. A method for operating a semiconductor lighting device, wherein the semiconductor lighting device comprises semiconductor light sources having at least two different colors and wherein, in order to adjust a color coordinate of the semiconductor lighting device, at least one brightness of the semiconductor light sources is set by means of a control and

wherein the at least one brightness of the semiconductor light sources is adjusted by at least two controls, and wherein, upon reaching or exceeding at least one predetermined switchover point, a switchover is made between two of the controls.

2. The method as claimed in claim 1, wherein the controls are selected from a group, which comprises:

a) an adjustment of the color coordinate of the semiconductor light source onto a position on a straight Judd line,

b) an adjustment of the color coordinate of the semiconductor light source onto a semi-axis of a MacAdam ellipse, and/or

c) an adjustment of the color coordinate of the semiconductor light source onto a position on the Planck'"'"'s plot curve.

3. The method as claimed in claim 2, wherein the switchover point correlates with a temperature at at least one of the semiconductor light sources.

4. The method as claimed in claim 2, wherein the switchover point correlates with a color coordinate.

5. The method as claimed in claim 4, wherein the switchover is carried out only on reaching the switchover point from one direction or exceeding it in one direction.

6. The method as claimed in claim 1, wherein the switchover is carried out between two control devices once for the duration of the lighting device being switched on.

7. The method as claimed in claim 1, wherein the switchover is carried out on reaching the switchover point from both directions or exceeding it in both directions.

8. The method as claimed in claim 7, wherein the switchover is carried out depending on the direction, with different switchover points.

9. The method as claimed in claim 8, wherein the different switchover points form a hysteresis of approximately 5°

C. to 10°

C.

10. The method as claimed in claim 3, wherein the color coordinate is initially adjusted onto a position on the Planck'"'"'s plot curve and, on reaching or exceeding a predetermined color temperature and/or the temperature, switchover takes place at at least one of the semiconductor light sources onto a position on a straight Judd line.

11. The method as claimed in claim 5, wherein the color coordinate is initially adjusted onto a position on a semi-axis of a MacAdam ellipse, and, on reaching or exceeding a point of intersection with the Planck'"'"'s plot curve, switchover takes place onto a position on a straight Judd line.

12. The method as claimed in claim 6, wherein switchover is carried out between the two controls at an operating temperature at at least one of the semiconductor light sources shortly before or upon reaching an operating temperature.

13. The method as claimed in claim 5, wherein the color coordinate is initially adjusted onto a position on a semi-axis of a MacAdam ellipse, and, on reaching or exceeding a point of intersection with the Planck'"'"'s plot curve, switchover takes place onto a position on the Planck'"'"'s plot curve.

14. A color control device, wherein the color control device is designed to carry out the method as claimed in claim 1.

15. The method as claimed in claim 2, wherein said semi-axis is a large semi-axis of a MacAdam ellipse.

16. The method as claimed in claim 12, wherein said operating temperature is approximately 80°

C.