Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1991-12-05
1993-03-16
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250372, 250554, H01J 4014
Patent
active
051947285
ABSTRACT:
A driver circuit for an ultraviolet detector (UV) tube discriminates between firing of the UV tube in response to ultraviolet radiation impinging on it and a high resistance short between its output terminals. A capacitor charged on half cycles of AC power applied to the circuit discharges partially when the UV tube fires. This charge is transferred to a second capacitor to create a voltage displaced from ground. Each time the UV tube fires, the steep wave front generated thereby is passed by a high pass filter to a switch which momentarily grounds the voltage on the second capacitor through a resistor. The rapid change in the switch element's voltage signifies the presence of ultraviolet radiation on the UV tube.
REFERENCES:
patent: Re29143 (1977-02-01), Bianchini
patent: 3914662 (1975-10-01), Bianchini
patent: 4280058 (1981-07-01), Tar
patent: 4280184 (1981-07-01), Weiner et al.
patent: 4328527 (1982-05-01), Landis
patent: 4578583 (1986-03-01), Ciammaichella et al.
patent: 4639717 (1987-01-01), DeMeirsman
patent: 4736105 (1988-04-01), Fonnesbeck
patent: 5023456 (1991-06-01), Claussen
Honeywell Inc.
Nelms David C.
Schwarz Edward
Shami K.
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