Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1975-08-28
1977-03-29
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250212, 250222R, H01J 3912
Patent
active
040151174
ABSTRACT:
The outputs of one or more interconnected, unbiased photovoltaic devices mounted to receive light generated by one or more modulated light sources are connected via a long cable to the input of a balanced low impedance differential input line preamplifier. When multiple photovoltaic devices are included, their outputs can be directly interconnected and the thusly combined output will provide information about the intensity of light impinging on their photo conductive surfaces. The balanced low impedance differential input line preamplifier comprises a differential amplifier and a pair of common base input stages, one connected to each input of the differential amplifier. In a DC decoupling embodiment, capacitors are used to couple the common base input stages to the differential amplifier. The output of the balanced low impedance differential input line preamplifier is connected to a detector that provides an output indicative of the state of the output of the photovoltaic devices.
REFERENCES:
patent: 2096902 (1937-10-01), Lamb
patent: 2813983 (1957-11-01), Hammar
patent: 3181035 (1965-04-01), Adams et al.
patent: 3311748 (1967-03-01), Volpe et al.
patent: 3487221 (1969-12-01), Frank
patent: 3727057 (1973-04-01), Higby et al.
patent: 3889118 (1975-06-01), Walker
Nelms David C.
Opcon Inc.
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