SU756631A1 - Voltage-to-digital code converter - Google Patents

Description

The invention relates to the field of automation and measurement technology. The device can be used * to convert a DC voltage or a current into a digital code to enter information into the control computer — a ^5th machine.

Known voltage converter - digital code generator comprising a magnetic core and a transistor, wherein the output winding occurs ki core ¹⁰ are respectively connected to valves recording and readout controlling analog converter timeslot assembled on a magnetic core, wherein the transducer winding output control valve connected to the pulse generator SC.

The disadvantages of the converter are the presence of two additional sources: recordings and. readout. which complicates its design, and the instability of the duration of the recording source signal, which—

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Toraya significantly degrades the accuracy of the conversion.

A known voltage converter is a digital code containing a magnetic core with recording, reading and output windings placed on it, connected to the valve input, another input of which is connected to the output of the pulse generator, and the output to the input of a pulse counter, sources of measured voltage and power [2 ^.

At a small measured voltage, the change in the inductions in the transformer core is small; moreover, the voltage drop across the active resistance of the input circuit containing the valve winding is comparable with the measured voltage. These factors cause a significant increase in error when measuring weak signals.

The aim of the invention is to expand the functionality of the Converter.

758631

The goal is achieved by the fact that the voltage converter is a digital code containing a magnetic core with write, read and output windings placed on it, connected to the input of the valve, another input of which is connected to the output of the pulse generator, and the output to the input of the pulse counter sources measured voltage and power, key, magnetizing winding and ob- introduced _; positive feedback, raz-; placed on the magnetic core and resistors, while the key is made on a transistor, the emitter of which is connected to the connection point of the magnetizing winding and positive feedback winding, the second output of which, through a resistor is connected to the base of the transistor, the collector of the latter is connected to the power supply terminal and through the second resistor connected to the first output of the read winding, the second output of which is connected to the second terminal of the power source and the second output of the magnetizing winding, the source of the measured voltage is connected with record winding.

The drawing shows a diagram of the proposed voltage converter — a digital code containing a pulse counter 1, a gate 2, a pulse generator 3, a magnetic core 4 on which the output winding 5 is located, a write winding 6, the read winding 7 connected through a 8 K resistor

To the inverter’s power supply source, a magnetizing winding 9 connected via a key on a transistor 10 to the same source, a positive feedback winding 11 connected via a resistor 12 to the base of the transistor.

The device works as follows.

When applying to the base of the transistor 10 command pulse to the measurement, it opens. -In the winding 9, a current begins to flow, the reversal of the core 4 to its original state. In this case, due to the EMF induced in the winding 11 of the positive feedback, the transistor is brought to saturation and kept open after the termination of the command pulse until the core is brought to saturation. At the moment of saturation of the core, the transistor 10 is locked, the derivative of the flux changes sign. Under the action of the supply voltage, the core is re-magnetized by the winding 7 in the opposite direction

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until saturation. The speed of magnetization reversal of the core is determined by the value

voltage applied directly to the winding 7, the amount of current in which

depends on the current in the winding record 6.

Thus, as the measured voltage changes, the current in the winding changes. records, and consequently, the current in the read winding and the speed of magnetic reversal of the core. Since the induction variation range in the core is constant, the duration of the voltage pulse in the output winding is determined by the speed of the magnetization reversal of the core and thus the magnitude of the measured voltage.

When the polarity of the voltage on the output winding corresponding to the reversal of the core 4 when read, the valve 2 opens and the pulses from the generator 3 arrive at the counter 1 of the pulses, the output of which produces an output signal as a digital code. At the end of core re-shaping, the valve closes and enters. The impulses on the counter are stopped. The value of the digital code at the output of the meter is a function of the measured voltage.

All processes in the driver are terminated until the next command is received for measurement.

The proposed converter reacts to the polarity of the measured voltage. If the ammeter turns reading and measuring windings act according to, then the duration of the output pulse decreases, and if they are directed counter, it increases. Since the converter actually responds to the amount of current flowing in its input winding, it can be used not only as a voltage converter, but also as a current converter - a digital code.

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Claims (1)

Claim Voltage converter is a digital code containing a magnetic core with write, read and output windings placed on it, connected to the valve input, another input of which is connected to the output of the pulse generator, and the output to the input of a pulse counter, sources of measured voltage and power, characterized in that, for the purpose of expanding— five 756631 6 functionalities, magnetizing winding and positive feedback winding are placed on the magnetic core and resistors, the key is made on a transistor, the emitter of which is connected to the point connecting the magnetizing winding and positive feedback winding the base of the transistor, the last collector is connected to the terminal of the power source and through the second resistor is connected to the first terminal of the winding reading, the second terminal of which is connected to the second terminal of the power source and the second terminal of the magnetizing winding, the source of the measured voltage is connected to the write winding.