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Title: Electronic logic to enhance switch reliability in detecting openings and closures of redundant switches

Abstract

A logic circuit is used to enhance redundant switch reliability. Two or more switches are monitored for logical high or low output. The output for the logic circuit produces a redundant and failsafe representation of the switch outputs. When both switch outputs are high, the output is high. Similarly, when both switch outputs are low, the logic circuit's output is low. When the output states of the two switches do not agree, the circuit resolves the conflict by memorizing the last output state which both switches were simultaneously in and produces the logical complement of this output state. Thus, the logic circuit of the present invention allows the redundant switches to be treated as if they were in parallel when the switches are open and as if they were in series when the switches are closed. A failsafe system having maximum reliability is thereby produced.

Inventors:
 [1]
  1. (Albuquerque, NM)
Publication Date:
Research Org.:
AT & T CORP
OSTI Identifier:
866071
Patent Number(s):
US 4626708
Assignee:
United States of America as represented by United States (Washington, DC) SNL
DOE Contract Number:  
AC04-76DP00789
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
electronic; logic; enhance; switch; reliability; detecting; openings; closures; redundant; switches; circuit; monitored; logical; output; produces; failsafe; representation; outputs; similarly; agree; resolves; conflict; memorizing; simultaneously; complement; allows; treated; parallel; series; closed; maximum; produced; logic circuit; circuit produces; electronic logic; switch reliability; redundant switch; /326/327/714/

Citation Formats

Cooper, James A. Electronic logic to enhance switch reliability in detecting openings and closures of redundant switches. United States: N. p., 1986. Web.
Cooper, James A. Electronic logic to enhance switch reliability in detecting openings and closures of redundant switches. United States.
Cooper, James A. Wed . "Electronic logic to enhance switch reliability in detecting openings and closures of redundant switches". United States. https://www.osti.gov/servlets/purl/866071.
@article{osti_866071,
title = {Electronic logic to enhance switch reliability in detecting openings and closures of redundant switches},
author = {Cooper, James A.},
abstractNote = {A logic circuit is used to enhance redundant switch reliability. Two or more switches are monitored for logical high or low output. The output for the logic circuit produces a redundant and failsafe representation of the switch outputs. When both switch outputs are high, the output is high. Similarly, when both switch outputs are low, the logic circuit's output is low. When the output states of the two switches do not agree, the circuit resolves the conflict by memorizing the last output state which both switches were simultaneously in and produces the logical complement of this output state. Thus, the logic circuit of the present invention allows the redundant switches to be treated as if they were in parallel when the switches are open and as if they were in series when the switches are closed. A failsafe system having maximum reliability is thereby produced.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {1}
}

Patent:

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