Circuit arrangement for automatically closing a switching transi

Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit

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250214A, 307311, 360 74, H01J 3912

Patent

active

041722213

ABSTRACT:
A light-emitting diode of a photo-coupler is energized and de-energized through a connection to a switching means. Radiation from the light-emitting diode directed toward a photosensitive means of the photocoupler, reduces the resistance of the photosensitive means to rendering a switching transistor conductive. The switching transistor is connected to and controlled by the photosensitive means. When the switching means is open, the switching transistor remains conductive for a predetermined time period due to a transient phenomena of a resistance change of the photosensitive resistor.

REFERENCES:
patent: 2416595 (1947-02-01), Reynolds
patent: 3210611 (1965-10-01), Krenke
patent: 3218462 (1965-11-01), Raub et al.
patent: 3308276 (1967-03-01), Panagiotou et al.
patent: 3566132 (1971-02-01), Walker

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