Slow acting photo lamp control

Details Slow acting photo lamp control Slow acting photo lamp control

H - Electricity

05

B

315/69, 315/73

H05B 37/02 (2006.01) H05B 39/04 (2006.01)

Patent

CA 1265841

CBP-7169 SLOW ACTING PHOTO LAMP CONTROL Abstract of the Disclosure 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 pho- tocell controlled digital lamp dimming circuit with par- ticularly 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.

542966

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