SU1523895A1 - Displacement-to-pulse duration transducer of linear displacements displacement-to-pulse duration transducer - Google Patents

Abstract

The invention relates to a measurement technique and can be used to automate measurements and control linear values. In order to improve the accuracy of the converter, which contains the differential transformer displacement sensor 1, integrator 2, comparator 3, voltage converter 4 to linearly varying current, zero potential bus 17, keys 5 to 9 are entered, elements 10, 11, inverters 12, 13, a pulse generator 14, a counting trigger 15, and a voltage source 16. The block diagram of the proposed converter makes it possible to eliminate the error caused by the active component of the resistance and the inductance of the windings of the differential transformer displacement sensor 1. 2 Il.

Description

The invention relates to a measurement technique and can be used for automating 1 and measuring and monitoring linear values.

The purpose of the invention is to improve the accuracy by eliminating the error caused by the active component of the resistance and inductance of the windings of the differential transformer displacement sensor.

FIG. 1 is a block diagram of a converter; in fig. 2 - timing charts characterizing his work.

The converter contains differential transformer sensor 1, integrator 2, comparator 3, voltage converter L to linearly varying current, keys 5–9, elements 10 and 11, inverters 12 and 13, pulse generator 14, counter trigger 15, source 16 reference voltage, 17 potential potential bus 17.

VALUE 17 of zero potential through the secondary winding of the differential transformer sensor 1 is connected to the information input of the integrator 2, the output of which is connected to the input of 1 comparator 3, the output of which is connected to the control input of the integrator 2 and the input of AND 10, the output of which is output converter

The Converter operates as follows.

At the output of the key S, a sequence of bipolar rectangular pulses is formed, which are fed to the input of the voltage converter 4 in linearly varying currents, supplying the two primary windings of the converter 1. In the first quarter of the pulse repetition period, the output of the inverter 12 is the logic one level, and at the output of the I 11, the logic zero level, which opens the keys 6 and 9, while the primary windings of the sensor 1 are turned on according to.

In this case, the voltage on the secondary winding of sensor 1 is equal to U, () Кi, + t- (Mjt4M) KU, j, g, where and ,, is the voltage, and not on the output of the source 16 of the reference voltage;

and - the voltage on the secondary winding of sensor 1;

K is the conversion factor of the voltage converter 4 is a linearly varying current;

KJJ - mutual inductance between one of the primary and secondary-windings with the average position of the rod; IM - the increment of mutual inductance of the primary and secondary windings.

This voltage is integrated by integrator 2, and the charge capacity of the integrator is charged to

and"

and, That / 4 2MoKUi6To

.That.

- the period of the voltage following

at the output of key 5; - - The integration time of the integrator 2 is constant. After the first quarter of the pulse period at the output of the element And 1, the voltage of the logical unit closes the keys 6 and 9. The keys 7 and 8 simultaneously open, and the second primary winding of the sensor 1 turns on opposite first the primary winding, and the voltage on the secondary winding of sensor 1 is

uj (M + 4M) Ki4b - (Ma + uM)

 ± 2 pcs., E.

This voltage is integrated by the integrator 2, which is already charged before the voltage U. Then the voltage on the integrator is

and.

 24MKU4 Te / 4

 21G 1g

(MaKyitIi + ShUD11y.). 2 21:

 - (MO ± LM) ..

At the end of the second quarter of the period Td, the current at the output of the switch 5 will change its direction to the opposite, at the same time the switches 7 and 8 open and the switches 6 and 9 close. As a result, the voltage on the secondary winding of sensor 1 is

 Ib2j89

and; - (Mo + AM) (M „-yM) Ki, /

 -2M "Ki ,.

five

This voltage is applied to the integrator 2, there is already a voltage in the code of the coyur and that, under the influence of and, varies

and

 Ki, t,

|| () m

The comparator 3 will fix the equality of Uj to zero, at the time instant D

 (M, ± yM) y-if-b- M ,;

- | - (M "± yM) ys, Mo;

/.c ,--f4lt -S;).

Thus, during one period TQ, it is possible to allocate an interval of time iCj proportional to the change in the mutual induction; 1 and AI of the sensor 1, which is directly determined by the core position.

Claims (1)

Invention Formula A transducer to pulse duration containing a differential transformer sensor, an integrator, a comparator, a voltage-to-voltage converter and a zero bus potential that through the first winding of the differential transform five 0 five 0 50 five 0 ( The sensor is connected to the information input of the integrator, the output of which is connected to the first input of the comparator, characterized in that, in order to improve accuracy, five keys, two AND elements, two inverters, a pulse generator, a counting trigger and a source / reference voltage are entered into it the output of which is connected to the information input of the first switch, the output of which is connected to the beginning of the first differential winding of the transformer sensor via the voltage to linearly variable current converter and the information input The second and third keys, the outputs of which are connected respectively to the beginning and end of the second differential winding of the transformer sensor, the outputs of the second and third keys are connected to the information inputs of the fourth and fifth keys, respectively, the fourth key output is connected to the end of the first differential winding of the transformer sensor and a zero potential bus connected to the output of the fifth key and the second input of the comparator, the output of which is connected to the integrator control input and the first input of the first about the element And, the output of the pulse generator through the counting trigger is connected to the control input of the first key, the output of the counting trigger is connected to the first input of the second element And through the first inverter to the second input of the first element And, the output of the pulse generator is connected to the second input of the second element And The output of which is connected to the control inputs of the third and fourth keys. li L i / 2 AC | I tY, y ,. and YU r,