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:
-
- Albuquerque, NM
- Issue Date:
- Research Org.:
- AT&T
- OSTI Identifier:
- 866071
- Patent Number(s):
- 4626708
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Classifications (CPCs):
-
G - PHYSICS G06 - COMPUTING G06F - ELECTRIC DIGITAL DATA PROCESSING
H - ELECTRICITY H03 - BASIC ELECTRONIC CIRCUITRY H03K - PULSE TECHNIQUE
- 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 = {Wed Jan 01 00:00:00 EST 1986},
month = {Wed Jan 01 00:00:00 EST 1986}
}