Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Radiant energy controlled regulation of the current supply...
Patent
1986-08-01
1987-09-29
Dixon, Harold
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Radiant energy controlled regulation of the current supply...
315151, 315156, 315DIG4, 315DIG7, H05B 3702
Patent
active
046971220
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.
REFERENCES:
patent: 4097782 (1978-06-01), Chambliss
patent: 4135116 (1979-01-01), Smith
patent: 4273999 (1981-06-01), Pierpoint
Armstrong World Industries Inc.
Dixon Harold
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