Slow acting photo lamp control
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 29, 1987
Grant Date -
N/A
app pub date -
Aug 1, 1986
filing date -
Aug 1, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A room lighting control system which controls the electrical power supplied to the artificial lighting in an area based on the ambient light available. A photocell controlled digital lamp dimming circuit with particularly high stability for time and temperature is combined with a slow response time to avoid short term adjustments. A digital counter is used to determine a large number of steps over the adjustment range and the driving clock operates at a very low frequency, so that changes in light level take a relatively long time, and it takes an exceptionally long time to span the entire adjustment range.
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Family
International Classification(s)
Cited Art Landscape
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