Industry Patents
Patent: 7880400
Digital Driver Apparatus, Method and System for Solid State Lighting
(Click image for PDF of full patent)
| Patent Number: |
7880400 |
| Title: |
Digital Driver Apparatus, Method and System for Solid State Lighting |
| Abstract: |
An apparatus, method and system are provided for controlling the solid
state lighting, such as LEDs. An exemplary apparatus comprises: a switch
for switching electrical current through the LEDs, a current sensor; a
first comparator adapted to determine when a switch electrical current
has reached a first predetermined threshold; a second comparator adapted
to determine when the switch electrical current has reached a
predetermined average current level; and a controller. The controller is
adapted to turn the switch into an on state and an off state, to
determine a first on time period as a duration between either a detection
of a second predetermined current threshold or the turning the switch
into the on state, and the detection of the predetermined average current
level; to determine a second on time period as a duration between the
detection of the predetermined average current level and the detection of
the first predetermined current threshold; and to determine an on time
period of the switch as substantially proportional to a sum of the first
on time period and the second on time period. Additional exemplary
embodiments utilize a difference between the first and second on time
periods to generate an error signal to adjust the on time period of the
switch.
|
| Country of Issue: |
US |
| First Named Inventor: |
Zhou, Shteynberg, Rodriguez, Eason, Nguyen |
| Assignee: |
Exclara |
| Continuation or Divisional of: |
|
| International Classification: |
H05B 41/16 |
| US Classification: |
315/247 |
| Issue Date: |
02-01-2011 |
| Filing Date: |
09-21-2007 |
| Application : |
11/859680 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
7880400 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
7880400 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
|
