Industry Patents
Patent: 7019469
Sinewave Dimmer Control Method
(Click image for PDF of full patent)
| Patent Number: |
7019469 |
| Title: |
Sinewave Dimmer Control Method |
| Abstract: |
An input line filter separates an ac sinusoidal power source from a power
switching stage having a series switching section and a clamp switching
section. Both the series switching section and a clamp switching section
include complementary pairs of high power and high speed MOSFETs. The
series switching section is connected in series between the input line
filter and the inductor of an output load filter between the power
switching stage and a load. The clamp switching section is connected to
shunt the inductor and load. Synchronous operation is achieved by
alternately operating the series and clamp switching sections to
conductive conditions at a high pulse width modulation frequency. The
duty cycle is selected to provide a sinusoidal output waveform with a
desired amplitude. A microprocessor based programmable controller
provides control signals for alternate conduction of the series and clamp
switching sections. A dead time interval stored in memory in the
controller separates the control signals for reliable and efficient
operation. The dead time interval may be constant, or may be varied in
accordance with load power variations.
|
| Country of Issue: |
US |
| First Named Inventor: |
Thurk, Suomi, Rasmussen |
| Assignee: |
Electronic Theatre Controls |
| Continuation or Divisional of: |
|
| International Classification: |
H05B 37/00 |
| US Classification: |
315/307 |
| Issue Date: |
03-28-2006 |
| Filing Date: |
10-21-2004 |
| Application : |
10/971682 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
7019469 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
7019469 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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