DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: "Smart" watchdog safety switch

Abstract

A method and apparatus for monitoring a process having a periodic output so that the process equipment is not damaged in the event of a controller failure, comprising a low-pass and peak clipping filter, an event detector that generates an event pulse for each valid change in magnitude of the filtered periodic output, a timing pulse generator, a counter that increments upon receipt of any timing pulse and resets to zero on receipt of any event pulse, an alarm that alerts when the count reaches some preselected total count, and a set of relays that opens to stop power to process equipment. An interface module can be added to allow the switch to accept a variety of periodic output signals.

Inventors:
 [1]
  1. 353 Church Rd., Beech Island, SC 29842
Issue Date:
Research Org.:
E I DUPONT DE NEMOURS & CO INC
OSTI Identifier:
868009
Patent Number(s):
5054023
Assignee:
Kronberg, James W. (353 Church Rd., Beech Island, SC 29842)
Patent Classifications (CPCs):
G - PHYSICS G06 - COMPUTING G06F - ELECTRIC DIGITAL DATA PROCESSING
DOE Contract Number:  
AC09-76SR00001
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
smart; watchdog; safety; switch; method; apparatus; monitoring; process; periodic; output; equipment; damaged; event; controller; failure; comprising; low-pass; peak; clipping; filter; detector; generates; pulse; valid; change; magnitude; filtered; timing; generator; counter; increments; receipt; resets; zero; alarm; alerts; count; reaches; preselected; total; set; relays; stop; power; interface; module; added; allow; accept; variety; signals; output signals; pulse generator; output signal; interface module; process equipment; event detector; /714/

Citation Formats

Kronberg, James W. "Smart" watchdog safety switch. United States: N. p., 1991. Web.
Kronberg, James W. "Smart" watchdog safety switch. United States.
Kronberg, James W. Tue . ""Smart" watchdog safety switch". United States. https://www.osti.gov/servlets/purl/868009.
@article{osti_868009,
title = {"Smart" watchdog safety switch},
author = {Kronberg, James W},
abstractNote = {A method and apparatus for monitoring a process having a periodic output so that the process equipment is not damaged in the event of a controller failure, comprising a low-pass and peak clipping filter, an event detector that generates an event pulse for each valid change in magnitude of the filtered periodic output, a timing pulse generator, a counter that increments upon receipt of any timing pulse and resets to zero on receipt of any event pulse, an alarm that alerts when the count reaches some preselected total count, and a set of relays that opens to stop power to process equipment. An interface module can be added to allow the switch to accept a variety of periodic output signals.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1991},
month = {1}
}