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 342, H03K 1914

Patent

active

039448614

ABSTRACT:
A radiation-sensitive switching circuit has a light emitting diode which supplies light to a photo-transistor, the light being interrupted from time to time. When the photo-transistor is illuminated, current builds up and when this current reaches a predetermined value, a trigger circuit changes state. The peak output of the photo-transistor is measured and the trigger circuit is arranged to change state when the output of the device is a set proportion of the peak output, so as to allow for aging of the components.

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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