Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1992-04-28
1993-11-30
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250221, 330308, H01J 4014
Patent
active
052667936
ABSTRACT:
A modulated photoamplifier precludes false output signals and oscillations in the event of component failure. The photoamplifier converts modulated electromagnetic energy into voltage pulses. A phototransistor receives the modulated electromagnetic energy and generates corresponding current pulses. A differential amplifier with negative feedback receives the current pulses and produces the corresponding amplified voltage pulses. A capacitor within the feedback network produces optimum gain at the frequency of the modulated electromagnetic energy. A failure of any component within the photoamplifier removes its ability to generate voltage pulses. Therefore, the photoamplifier precludes false output signals and fails to a safe condition in response to the component failure.
REFERENCES:
patent: 3612884 (1971-10-01), Linardos
patent: 3867628 (1975-02-01), Brown
patent: 3970846 (1976-07-01), Schofield, Jr. et al.
patent: 5077467 (1991-12-01), Barron, Jr. et al.
patent: 5089788 (1992-02-01), Shiga
Motorola Linear/Interface Devices, pp. 2-278 through 2-282 (no date).
Banner Engineering Corporation
Le Que T.
Nelms David C.
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