Industry Patents
Patent: 4823069
Light Dimmer for Distributed Use Employing Inductorless Controlled Transistion Phase Control Power Stage
(Click image for PDF of full patent)
| Patent Number: |
4823069 |
| Title: |
Light Dimmer for Distributed Use Employing Inductorless Controlled Transistion Phase Control Power Stage |
| Abstract: |
An improved dimming apparatus adapted for use in distribution dimming
systems, in which dimmer enclosures each containing at least one
semiconductor power controlling means are located in a plurality of spaced
apart locations, each such enclosure located in proximity to at least one
of its associated lamp loads. The disclosed dimming apparatus achieves
unique advantages in the application through the use of a semiconductor
power controlling means capable of modulating the instantaneous amplitude
of the voltage or current supplied to the lamp load under the active
control of its control input, a signal being applied to the control input
of the power controlling means such that an output waveform is supplied to
the lamp load in which at least one transition between a substantially off
condition and a substantially on condition occurs during substantially
each discrete half-cycle of the AC source and the duration of the
transition is increased to suppress electro-magnetic interference.
|
| Country of Issue: |
US |
| First Named Inventor: |
Callahan, Chester, Goddard |
| Assignee: |
|
| Continuation or Divisional of: |
4633161 |
| International Classification: |
G05F 1/40 |
| US Classification: |
323/235 |
| Issue Date: |
04-18-1989 |
| Filing Date: |
12-17-1986 |
| Application : |
943381 |
| Notes: |
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| Link to Patent at freepatentsonline.com: |
4823069 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
4823069 at Google Patents |
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after the patent has issued - they take a while to get new patents in their systems.
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