Monitoring circuit

Details Monitoring circuit Monitoring circuit

1978-02-16

1980-07-22

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

328 97, 328104, 328117, 328147, H03K 518

Patent

active

042141770

ABSTRACT:
A monitoring circuit for determining whether or not m out of n a.c. input signals meet at least one predetermined set of signal characteristics is disclosed. The circuit includes n input terminals, each for receiving a different one of the input signals being monitored. A logic circuit monitors the condition of the n input signals and generates either an a.c. or a d.c. output signal as a function of the condition of the input signals. A d.c. output signal is generated whenever m out of n input a.c. signals have maxima and minima which both lie above or both lie below a predetermined signal range corresponding to at least one of the preset signal characteristics. An a.c. output signal is generated whenever m out of n input signals have maxima and minima which respectively lie above and below the predetermined signal range.

REFERENCES:
patent: 3289193 (1966-11-01), Worthington et al.
patent: 3538498 (1970-11-01), Game et al.
patent: 3686657 (1972-08-01), Renoulin

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