Detectors

Details Detectors Detectors

1980-03-17

1983-02-08

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307261, 307351, 307519, G01R 1902, G01R 1922, G01R 2309

Patent

active

043731392

ABSTRACT:
An averaging detector having a first transistor having a first resistor connected across the base and emitter, a first capacitor connected in a signal input line and to the base of a second transistor, the collectors of the first and second transistors being connected to a positive voltage line and the base of the first transistor being connected to an output voltage line, together with the emitter of the second transistor via a second resistor, an inhibit switch comprising a third transistor being connected between the base of the second transistor and a zero voltage line, a third resistor and second capacitor being connected in parallel between the zero voltage line and the output voltage line, the arrangement being such that on application of a voltage greater than the threshold voltage of the first transistor successive positive and negative cycles alternately reverse bias and forward bias the first and second transistors to achieve a balance between the half cycle charging through the second resistor and the continuous discharge through the third resistor to thereby provide a DC output proportional to the average input voltage waveform envelope.

REFERENCES:
patent: 3983417 (1976-09-01), Rheinfelder

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