Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1984-01-20
1986-12-02
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307219, 307247A, 371 67, H03K 19003, H04L 100, G06F 702, G06F 1116
Patent
active
046267085
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.
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Bertelson David R.
Chafin James H.
Heyman John S.
Hightower Judson R.
Sopp Albert
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