Industry Patents
Patent: 7369386
Overcurrent Protection For Solid State Switching System
(Click image for PDF of full patent)
| Patent Number: |
7369386 |
| Title: |
Overcurrent Protection For Solid State Switching System |
| Abstract: |
Current sensing resistors are connected directly to output terminals of
MOSFETs forming the series switching stage of a PWM sinewave dimmer. An
analog sensed current signal is coupled through an EMI resistant current
link to comparators that provide an overcurrent indication in response to
an overcurrent condition. A logic circuit overrides PWM control signals
from a programmable controller, and operates drivers to render the series
switching stage nonconductive and to render a clamp switching stage
conductive until after the end of the current PWM duty cycle power on
segment. The logic circuit sends an overcurrent signal through an
optocoupler to an input of the programmable controller. The input of the
controller is polled at a clock frequency for overcurrent signals and if
the count exceeds a limit in any half cycle, or a maximum sum in sixteen
half cycles of the AC supply, the series switching stage is rendered
nonconductive and the clamp switching stage is rendered conductive
pending a reset signal.
|
| Country of Issue: |
US |
| First Named Inventor: |
Rasmussen, Thurk, Suomi |
| Assignee: |
Electronic Theatre Controls |
| Continuation or Divisional of: |
6849943 |
| International Classification: |
H02H 9/08 |
| US Classification: |
361/93.9 |
| Issue Date: |
05-06-2008 |
| Filing Date: |
01-31-2005 |
| Application : |
11/048123 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
7369386 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
7369386 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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