Industry Patents
Patent: 5268631
Power Control System with Improved Phase Control
(Click image for PDF of full patent)
| Patent Number: |
5268631 |
| Title: |
Power Control System with Improved Phase Control |
| Abstract: |
An improved phase-controlled power control apparatus includes a
semiconductor switching element for varying the effective power delivered
to a load from the power lines. The conduction angle of the semiconductor
power switch element is varied from a nominal angle to compensate for
changes in power line voltage and for changes in load current. The amount
of load current flow is continuously compared to the power line voltage to
detect any overcurrent condition, even very close to the zero-crossing of
the power line voltage. The shape of the transition from load current on
to load current off (or vice versa) in controlled to minimize audible
noise from the load. The load current can be shared between a plurality of
compatible power control sections.
|
| Country of Issue: |
US |
| First Named Inventor: |
Gorman, Warren |
| Assignee: |
Chicago Stage Equipment |
| Continuation or Divisional of: |
|
| International Classification: |
G05F 1/455 |
| US Classification: |
323/246 |
| Issue Date: |
12-07-1993 |
| Filing Date: |
11-06-1991 |
| Application : |
788437 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
5268631 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
5268631 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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