SU1285573A1 - Device for generating and converting signal of differential-transformer converter - Google Patents

Abstract

The invention can be used in the field of automation in devices for remote measurement of non-electric parameters, automatic control and monitoring devices, in particular, in devices for comparing signals of differential transformer converters (DTP) with a setting signal and other DC signals. The aim of the invention is to improve the accuracy of conversion by changing the frequency of the input signal & To achieve this goal, a detector 6, an adder 7 and a threshold element 8 are additionally introduced into the device. The device also contains an alternating voltage source 1, an integrator 2, a voltage to current converter 3, an accident 4, and a signal receiver 5, which can be performed on the series-connected demodulator 9 and filter 10. The invention makes it possible to replace scarce and expensive materials with low magnetic losses, used in the manufacture of certain accidents and sensors, with ordinary ones and to reduce dimensions of accidents, sensors and secondary devices. 1 il.

Description

IS3i

Yu

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15

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The invention can be used in automation in devices for measuring non-electric parameters, in automatic control and monitoring devices 5, in particular in devices that compare the signals of differential transformer converters (DTP) with the detector signal and each other. DC signals, the formation and amplification of the error signal of the regulating device.

The purpose of the invention is to improve the accuracy of conversion with a change in the frequency of the input signal.

The drawing shows an electrical block diagram of the device.

The device contains source 1

AC voltage, the output of which is connected in series with the integrator 2, the converter 3 voltage to current, accident 4 and the receiver 5 signal, followed by 25 connected detector 6, the adder 7 and the threshold element 8. The signal receiver can be performed on the series connected to the demodulator 9 and filter 10. Moreover, the second and third inputs of the adder 7 are connected respectively to the outputs of the integrator 2 and the alternating voltage source 1, which is connected to the input of the detector 6. The output of the threshold element is connected to input th control pri- emnika 5.

The device works as follows.

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Suppose that at the output of source 1 of alternating voltage, a negative polarity voltage appeared. The voltage at the output of the adder 7 is the algebraic sum of the output voltages of the source 1 of the alternating voltage, the integrator 2 and the detector 6 with the scale factors, respectively, КЗ, К2, К1, and К1 К2 1КЗ | 50 and, with an appropriate choice of K1, K2, short-circuit and constant integration, negative polarity. At the output of the threshold element 8, the voltage of the negative polarity is set in jumps and the demodulator 9, made in the form of a key, closed at the control input by the voltage of the positive polarity is opened.

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five

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5 50 When the voltage at the output of source 1 becomes positive, the voltage at the output of detector 6 is zero and the voltage of negative polarity remains at the output of integrator 2. The key of the receiver 5 remains in the open state. The output voltage of the integrator 2 begins to increase.

When the sum of the output voltages of source 1 and integrator 2 becomes greater than zero, the output of the threshold element abruptly sets the voltage of positive polarity. The demodulator key 9 closes and the output voltage starts to change, rushing to the average value, during the time during which the demodulator key 9 is closed. When the negative polarity voltage appears at the output of the source 1, the key of the demodulator 9 opens again. The process described is repeated periodically.

Thus, signals of positive polarity dd1 of key control of demodulator 9 are generated, which can have a duration from 1/4 of the oscillation period of source 1

(at) to zero (at K1; K2). The termination of the control pulse always occurs at the moment of the end of the oscillation period of the square voltage source.

With a decrease in the time during which the demodulator key is closed, the output voltage of the filter increases, approaching the amplitude value of the output voltage of the accident. With a sufficiently short duration, the effect of the shape of the DTP's vibrations on the output value is almost eliminated. Thus, conversion errors due to distortion of the voltage shape and amplitude depending on the frequency of the signal caused by magnetic losses in the design elements of the crash sensors are reduced.

This makes it possible to use an increase in the frequency of power supply to the accident, to increase the steepness of the conversion characteristic and to reduce energy consumption. The application of the proposed device is solved with the issues of ensuring the interchangeability of accidents of various types. In particular, it is possible to add signals of several types of accidents of different types (using an additional adder at the input of the demodulator) with signals of a constant voltage to the current.

It becomes possible to replace scarce and expensive materials with low magnetic losses, used in the manufacture of some accidents and sensors, with ordinary ones, to reduce the overall dimensions of accidents, sensors and secondary devices. .

Claims (1)

Invention Formula A device for generating and converting a signal of a differential transformer converter containing a source of alternating voltage to the output of which are connected in series an integrator, a converter of voltage to current, a differential transformer converter and a signal receiver, characterized in that conversion when the input signal frequency changes, a detector, an adder and a threshold element are inserted into it in series, with the second and third The inputs of the adder are connected together with the integrator output and the output of the alternating voltage source, which is connected to the detector input, and the output of the threshold element is connected to the control input of the signal receiver.