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

Patent · Wed Jan 01 00:00:00 EST 1986

OSTI ID:866071

Cooper, James A ^[1]

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1. Albuquerque, NM

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.

• Research Organization: AT&T
• DOE Contract Number: AC04-76DP00789
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4626708
• OSTI ID: 866071
• Country of Publication: United States
• Language: English

Related Subjects

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output
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outputs
similarly
agree
resolves
conflict
memorizing
simultaneously
complement
allows
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parallel
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electronic logic
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