Industry Patents
Patent: 7321203
LED Dimming Control Technique for Increasing the Maximum PWM Dimming Ratio and Avoiding LED Flicker
(Click image for PDF of full patent)
| Patent Number: |
7321203 |
| Title: |
LED Dimming Control Technique for Increasing the Maximum PWM Dimming Ratio and Avoiding LED Flicker |
| Abstract: |
Circuitry and methodology for providing LED dimming control in a LED
driving system having a switching regulator for providing power supply to
drive the LED. The switching regulator includes a switching circuit to
which an oscillation signal is applied to control switching of the
switching circuit. A dimming control input is supplied with a pulse-width
modulation (PWM) dimming control signal to provide PWM dimming control of
the LED. The dimming control input applies the PWM dimming control signal
to control switching of the switching circuit. A synchronizing circuit is
provided for synchronizing the oscillation signal to the PWM dimming
control signal.
|
| Country of Issue: |
US |
| First Named Inventor: |
Marosek |
| Assignee: |
Linear Technology Corporation |
| Continuation or Divisional of: |
|
| International Classification: |
H05B 41/16 |
| US Classification: |
315/247 |
| Issue Date: |
01-22-2008 |
| Filing Date: |
03-13-2006 |
| Application : |
11/373266 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
7321203 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
7321203 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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