Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Electric switch controlled by the radiant energy responsive...
Patent
1996-03-04
1999-04-06
Wong, Don
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Electric switch controlled by the radiant energy responsive...
315151, 315360, 340568, H05B 3700
Patent
active
058923314
ABSTRACT:
A lamp control apparatus that responds to sudden increases in ambient light by energizing a light bulb for a short period of time. A first voltage comparator is connected to a photocell circuit such that its output normally presents a high impedance to a timing capacitor connected to the input of a second voltage comparator which, in turn, provides a gate signal for a triac power switch. The first comparator will switch to a low impedance output if a sufficient amount of light suddenly appears at the photocell. This low impedance will rapidly discharge the timing capacitor and allow the second comparator to energize the lamp. The timing capacitor will then slowly charge back to a voltage that will cause the second comparator to remove the gate signal for the triac, thereby de-energizing the lamp.
REFERENCES:
patent: 3630015 (1971-12-01), Lehovec
patent: 3909819 (1975-09-01), Radford
patent: 4441143 (1984-04-01), Richardson
patent: 4587417 (1986-05-01), Duve et al.
patent: 4587459 (1986-05-01), Blake
patent: 4697122 (1987-09-01), Hoffer
Vu David H.
Wong Don
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