Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1976-03-17
1977-06-14
Miller, Jr., Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307229, 235194, 328143, G06G 712
Patent
active
040300390
ABSTRACT:
For the generation of inverse time characteristics for time-lag type over-current relays or the like, by approximation of the time function by means of individual, linear parts into a time function which is discontinuous at a number of break points. A plurality of amplifier circuits corresponding to the number of break points in the approximated time function each has at least one input and at least one output and operates as an ideal diode. The input of each of the amplifier circuits is connected to an input voltage source. An arrangement is provided for selectively connecting the output of each of the amplifier circuits to the input or output of the operational amplifier, depending on whether the linear part of the time function, determined by a selected amplifier circuit, has a greater or smaller derivative than the preceding linear part of the time function.
REFERENCES:
patent: 3550020 (1970-12-01), Gill et al.
patent: 3560727 (1971-02-01), Schussler
patent: 3622770 (1971-11-01), Edelson
patent: 3644836 (1972-02-01), Johnson
patent: 3736515 (1973-05-01), Kadron et al.
patent: 3737642 (1973-06-01), Kulas
patent: 3757234 (1973-09-01), Ohlson
patent: 3895224 (1975-07-01), Spratt et al.
patent: 3962648 (1976-06-01), Watson, Jr.
ASEA Aktiebolag
Miller, Jr. Stanley D.
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