Radiation-sensitive switching circuits

Details Radiation-sensitive switching circuits Radiation-sensitive switching circuits

1974-07-03

1976-03-16

Heyman, John S.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

H03K 1914, H03K 342

Patent

active

039448606

ABSTRACT:
A radiation-sensitive switching circuit includes a light emitting diode which from time to time illuminates a photo-transistor, the photo-transistor serving when its output reaches a predetermined value to operate a trigger circuit. In order to allow for aging of the components, the current flow through the diode is increased when the output from the transistor falls below a known level. Conveniently, this is achieved by having a transistor in parallel with the diode, and turning the transistor off when the output from the photo-transistor becomes too low.

REFERENCES:
patent: 2947875 (1960-08-01), Beck
patent: 3421488 (1969-01-01), Tarter
patent: 3562534 (1971-02-01), Jarrett
patent: 3622801 (1971-11-01), Stone

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