Proving safe operation

Details Proving safe operation Proving safe operation

1984-07-27

1987-06-09

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Superimposed unlike currents

Different frequencies or phase

246 40, 246125, 307 9, B61L 1102

Patent

active

046722238

ABSTRACT:
To ensure the safe operation of an electronic circuit, for example an amplitude modulated carrier signal generator, an output of the circuit is analyzed to prove the presence of predetermined signal characteristics, for example the carrier signal, or a modulation frequency. The predetermined signal alternatively may be superimposed on an input to the electronic signal and proved subsequently to be present in the output. The output of the circuit is passed inhibited, according to whether or not the signal characteristics are proved present, by means of an output enable gate which is self-latching providing the output continues to be proved correct. A start-up circuit delays a possible inhibit for a limited period following initial power connection to the circuit in order that the output can become established.

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