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Self-compensating voted logic power interface with tester

  • US 4,687,623 A
  • Filed: 10/31/1985
  • Issued: 08/18/1987
  • Est. Priority Date: 10/31/1985
  • Status: Expired due to Term
First Claim
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1. An n out of m voted logic power interface circuit for connecting a load device to an electric power source with means providing an indication of the state of switches within the circuit, said power interface circuit comprising:

  • m sets of switches arranged in a plurality of groups of switches with said groups of switches connected in parallel with each other and in series with the load device and the electric power source, each said group of switches including a different selection of n switches connected in series each from a different one of said m sets of switches, said plurality of groups of switches comprising all possible different combinations of m sets taken n at a time, such that with at least n out of m sets of switches actuated the load device is actuated;

    a resistor shunting each of said switches to provide a leakage path through each group of switches, the impedance of said resistors being several magnitudes larger than that of a closed switch such that the current through said leakage paths is insufficient to energize the load; and

    detector means connected to each group of switches and responsive to a change in impedance produced by actuation of a resistor shunted switch in said group to generate a signal having one value when none of said switches in the group are actuated and a second value when at least one of said switches in the group is actuated.

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