Industry Patents
Patent: 8115418
Method and Device for Driving Light-Emitting Diodes of an Illumination Device
(Click image for PDF of full patent)
| Patent Number: |
8115418 |
| Title: |
Method and Device for Driving Light-Emitting Diodes of an Illumination Device |
| Abstract: |
A method for driving series-connected light-emitting diodes of an
illumination device, in particular an illumination device for film, video
and photographic recordings with a pulse-width-modulation of the
light-emitting diode current, is provided. In the method the
pulse-width-modulated light-emitting diode current is detected and a
current sensor signal is derived and fed to a microprocessor, which
outputs a drive signal for the pulse-width-modulation and for the setting
of the light-emitting diode voltage applied to the light-emitting diodes,
depending on the detected current sensor signal. The current-time
integral of the pulse-width-modulated light-emitting diode current
flowing through the light-emitting diodes is determined and a
controllable voltage source for setting the light-emitting diode voltage
is driven in such a way that a predetermined pulse-width-modulated
light-emitting diode current flows through the light-emitting diodes.
|
| Country of Issue: |
US |
| First Named Inventor: |
Haubmann |
| Assignee: |
Arnold and Richter (Arri) |
| Continuation or Divisional of: |
|
| International Classification: |
H05B 37/02 |
| US Classification: |
315/307 |
| Issue Date: |
02-14-2012 |
| Filing Date: |
06-20-2007 |
| Application : |
12/308624 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
8115418 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
8115418 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.
Disclaimer: This web site is not intended to offer comprehensive or sufficient
information to enable a full legal analysis of a patent or potential
infringement. The information provided on this web site is intended
as general information only, and is not intended to serve as legal
opinion, legal advice or as a substitute for legal counsel. If you
have a question about a specific factual situation, you should
contact an attorney directly
|
