Registers – Transfer mechanism – Traveling pawl
Patent
1975-07-17
1976-12-14
Ruggiero, Joseph F.
Registers
Transfer mechanism
Traveling pawl
235195, 307229, 324142, G06G 716, G01R 1132
Patent
active
RE0290793
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: 3017108 (1962-01-01), Kalbfell
patent: 3358129 (1967-12-01), Schultz
patent: 3466460 (1969-09-01), Connolly
patent: 3500200 (1970-03-01), Woodhead
patent: 3536904 (1970-10-01), Jordan, Jr. et al.
patent: 3602843 (1971-08-01), De Vries
patent: 3655955 (1972-04-01), Brendle
Motor Finance Corporation
Ruggiero Joseph F.
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