Double-current detector

Details Double-current detector Double-current detector

1987-08-06

1988-09-27

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

328 32, 455619, H04L 2706

Patent

active

047747170

ABSTRACT:
A double-current detector for generating a rectangular waveform signal substantially in phase with a received double-current signal has a full-wave rectifying bridge circuit having a pair of AC terminals for receiving the double-current signal therebetween, a pair of DC terminals, a first photocoupler including a light-emitting element connected between the DC terminals, and a second photocoupler including a light-emitting element connected in one arm of the bridge circuit. An increase in the double-current signal is detected by using an output signal from the first photocoupler, and the polarity of the double-current signal is detected by using an output signal from the second photocoupler. In response to signals indicative of the increase and polarity of the double-current signal, a logic circuit controls a flip-flop to produce an output signal as the rectangular waveform signal.

REFERENCES:
patent: 3535556 (1970-10-01), Hall
patent: 3723765 (1973-03-01), Kautz et al.
patent: 4012702 (1977-03-01), Weber
patent: 4117757 (1978-10-01), Akamatu
patent: 4507571 (1985-03-01), Callan
patent: 4575643 (1986-03-01), Sakai
patent: 4672642 (1987-06-01), Willis et al.

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