Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1973-04-16
1976-03-16
Brody, Alfred L.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307235R, 307251, 328142, 332 9T, G06G 712, H03K 1760
Patent
active
039448525
ABSTRACT:
In the switching circuit, the output signal from a high-gain differential amplifier is caused to reverse polarity by means of the switching of a pair of field-effect transistors. A resistor is connected in series with the inverting lead of the differential amplifier, and a signal source is connected to the resistor at an input terminal. The field-effect transistors are used to connect the non-inverting lead of the differential amplifier alternately between the input terminal and ground. This causes the amplifier output to reverse polarity, and thus provides a very accurate, low-offset means of switching the output of the amplifier. The switching circuit is used in a modulator which permits output pulses to be modulated in width and/or frequency. The reversible output signals of the switching circuit are added to the modulating input signal and the sum is integrated. A level detector changes the polarity of its output voltage whenever the output of the integrator reaches either of two fixed levels. The output of the level detector is used to drive the field-effect transistors to control the switching of the output of the differential amplifier. Such a pulse-width modulator is used to drive a pulse-height modulator so as to form a multiplier. The multiplier can be used to great advantage as a wattmeter by supplying load current and voltage signals to the pulse-width and pulse-height modulators so as to multiply the load current and voltage by one another. The same device can be used as a divider by holding either one input to the pulse-width modulator or the input to the pulse-height modulator constant, while allowing the other of those inputs to be variable and the input to the switching circuit to be the other variable.
REFERENCES:
patent: 3489919 (1970-01-01), Wolterman
patent: 3510684 (1970-05-01), Martin
patent: 3562553 (1971-02-01), Roth
patent: 3591854 (1971-07-01), Cole
patent: 3659210 (1972-04-01), Nilsson
patent: 3723910 (1973-03-01), Cannon
Brody Alfred L.
Motor Finance Corporation
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