Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1974-12-23
1976-03-09
Chatmon, Jr., Saxfield
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307234, 328133, 328138, 328141, H03K 520
Patent
active
039433820
ABSTRACT:
A switching circuit which is actuated when the frequency of an input signal falls below a specified value, includes an input circuit for providing a rectangular pulse train consisting of pulses having durations indicative of the frequency of the input signal. The rectangular wave train is used to actuate a pair of one-shot multivibrators adjusted to produce output pulses having durations such that the pulses from the first one-shot correspond to an upper reference frequency slightly below that of a nominal input frequency, and the pulses from the second one-shot correspond to a lower reference frequency equal to the minimum acceptable input frequency. The output signals from the one-shot multivibrators are applied to clock terminals of first and second edge-triggered flip-flops, whereas the D input terminals of the same flip-flops are actuated by the rectangular pulse train. Each edge-triggered flip-flop operates so that the first positive-going clock pulse transfers the instantaneous value of its D input signal to its output terminal. The transferred signals from the two flip-flops are applied to clear and preset terminals, respectively, of a latching flip-flop which produces a disabling signal when the frequency of the input signal falls below the minimum acceptable value and retains the disabling signal until the input frequency is increased to a level at least as high as that represented by the upper reference frequency.
REFERENCES:
patent: 3521174 (1970-07-01), Naubereit et al.
patent: 3757233 (1973-09-01), Dixon
patent: 3783394 (1974-01-01), Avery
patent: 3803599 (1974-04-01), McLean et al.
patent: 3808407 (1974-04-01), Ratz
Hermansdorfer James E.
Swygert, Jr. Wilbert E.
Chatmon, Jr. Saxfield
Roehl Joseph M.
Sperry Rand Corporation
Terry Howard P.
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