Industry Patents
Patent: 7288902
Color Variations in a Dimmable Lighting Device With Stable Color Temperature Light Sources
(Click image for PDF of full patent)
| Patent Number: |
7288902 |
| Title: |
Color Variations in a Dimmable Lighting Device With Stable Color Temperature Light Sources |
| Abstract: |
A method and system allow a lighting device having light sources with
multiple color temperatures to vary a color temperature of the lighting
device in response to changing dimming levels. The light sources are
non-incandescent light sources, such as light emitting diodes and/or
gas-discharge lights. A dimmer circuit provides a dimming signal that
indicates a selected dimming level. The lighting device includes a light
source driver and a light source driver controller that cooperate to vary
drive currents to the light sources in response to the selected dimming
level. By varying the drive currents in different relative amounts, the
color temperature of the lighting device changes in response to dimming
level changes. In at least one embodiment, changes in the color
temperature of the lighting device in response to the dimming level
changes simulates the color temperature changes of an incandescent light
source.
|
| Country of Issue: |
US |
| First Named Inventor: |
Melanson |
| Assignee: |
Cirrus Logic |
| Continuation or Divisional of: |
|
| International Classification: |
G05F 1/00 |
| US Classification: |
315/291 |
| Issue Date: |
10-30-2007 |
| Filing Date: |
04-01-2007 |
| Application : |
11/695023 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
7288902 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
7288902 at Google Patents |
1. The Google Patents and World Patent Family links will likely not work until a few weeks
after the patent has issued - they take a while to get new patents in their systems.
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