Base point floating cut off wave form differential signal detect

Details Base point floating cut off wave form differential signal detect Base point floating cut off wave form differential signal detect

1989-08-14

1990-07-17

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307268, 307491, 307494, H03K 508, H03K 5153

Patent

active

049423150

ABSTRACT:
A differential signal detector circuit having a differential signal detector for detecting a differential signal to provide a detecting signal and a comparing detector having a timer with a time constant for comparing the detecting signal with a base point signal and providing a differential signal detection signal when the detected differential signal differs sufficiently from a base point signal is improved by providing a floating base point signal. For this, the circuit additionally has a floating base point loop for providing the floating base point signal, a wave form cuttoff loop for cutting off the affect of the floating base point loop, and a voltage balance loop for avoiding directional impedance differences. As a result, the differential signal detector circuit produces the detection signal only when the differential signal exceeds the floating base point signal sufficiently for a sufficient time.

REFERENCES:
patent: 4175256 (1979-11-01), Dolikian
patent: 4217553 (1980-08-01), Winebarger

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