Industry Patents
Patent: 7642734
Method and System For Dimming Light Sources
(Click image for PDF of full patent)
| Patent Number: |
7642734 |
| Title: |
Method and System For Dimming Light Sources |
| Abstract: |
Dimming a light source such as a LED over a dimming range (0%-100%)
involves adjusting at least one of the intensity (I) and the duty-cycle
(DR) of a current flowing through the light source. The dimming range
includes at least one portion (L%-H%; 0%-H%) where the light source is
fed with a current whose intensity (I) is switched with a given duty
cycle (DR) between a non-zero on value and zero, the non-zero on value
being a fraction of the rated value (Irated), whereby joint CC and PWM
dimming is achieved.
|
| Country of Issue: |
US |
| First Named Inventor: |
De Anna |
| Assignee: |
Osram |
| Continuation or Divisional of: |
|
| International Classification: |
G05F 37/02 |
| US Classification: |
315/308 |
| Issue Date: |
01-05-2010 |
| Filing Date: |
01-26-2006 |
| Application : |
11/339492 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
7642734 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
7642734 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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