SU1249704A1 - Shaft turn angle-to-digital converter - Google Patents

Abstract

The invention relates to automation and computer technology and to mono. It can be used to connect analog information sources with a digital computing device. In order to increase the accuracy of the converter by reducing the influence of the instrumental errors of synchronous detectors, sinusoidal and cosine shapers. voltage, analog adder, phase shifting element, inverter unit and second digital adder are entered into the converter. At the outputs of a sine-cosine rotating transformer (CCTVT), alternating-current voltages uJ are produced, modulated according to sine and cosine laws as a function of the e / rotation angle. On a phase-shifting element, these voltages are converted into two alternating current of constant amplitude, phase-shifted in different directions, by an angle oL From the output code of the pulse generator, which varies according to the sawtooth law with frequency uJ, and the output code N of the reversible counter, digital totalizers in conjunction with a driver, produce cosine and sine wave voltages with a frequency oJ and phase-shifted in different directions by an angle proportional to code N. Output signals of cosine wave conditioners . sinusoidal voltages and a phase shifting element are compared in pairs in synchronous detectors, the output signals of which are added together. The constant component of the sum voltage of the total signal controls the operation of the reversible counter, providing the matching of its output code N with the angle oi of the rotation signal. 1 il. (L with to 4 WITH

Description

The invention relates to automation and computing and may be used to connect analogue information sources with a digital computing device.

The purpose of the invention is to increase the accuracy of the converter by reducing the influence of instrumental errors of synchronous detectors, sinusoidal and tangential voltage generators, analog adder i

The drawing shows the structure of the converter circuit.

The converter contains a sine-cosine rotational rotation transformer SKVT 1, a phase-shifting element 2, first 3 and second 4 synchronous detectors, shaper 5 cosine and residual voltage, shaper 6 sine-wave voltage, shaper 7, sinusoidal current, first 8 and second 9 digital combiners, an inverter unit 10, a pulse generator 11, a voltage-to-frequency conversion unit 12, a reversible counter 13, an analog adder 14.

The Converter operates as follows.

Pulse generator 11 forms a grid of frequencies. The shaper 7-generates a sinusoidal current of the power supply system SSCT 1 with a frequency and. At the outputs of SSCT 1, alternating current voltages are produced, modulated according to the sinusoidal and sinusoidal law as a function of the angle of rotation. At the outputs of the phase shift of element 2, two voltages Uj and alternating current of constant amplitude are formed, but shifted in phase in different directions by an amount proportional to the rotation angle Ы

and. (uJt-J + od);

 (); where 1 is the constant phase shift,

introduced by the phase-shifting element 2.

The output code N of the reversible counter 13 and its inverse value are fed to one inputs of digital adders 8 and 9, respectively, to the other inputs of which the sawn-variable output frequency 11 of the generator 11 arrives. Shapes 5 and 6, made in the form of constant blocks nna

five

0

five

0

five

0

five

memory, generate AC voltage

ccsdjjt + n);

0

five

3,

sin (uJt-n)

The outputs of the synchronous detectors 3 and 4 produce voltages proportional to, Uj and U, U, respectively, which are summed in analog adder 14. Excess voltage U of adder 14 Uy -U., S 1 n (ot-R) s The in (aJt -1) s contains a direct current component and an alternating current component, which is filtered by a filter installed at the input of the voltage-to-frequency conversion unit 12.

  J.jj 11

Unit 12 generates pulses with a frequency proportional to the magnitude / misalignment between ° C. and | sj. Output pulses of block 12, depending on the error between d and N, are input to the addition or subtraction of the reversible counter 13, changing the value of N to eliminate the error. As a result, in steady state, the output code N of the reversible counter 13 is the code equivalent of the rotor blast plaque 1.

In such a converter, the initial inequality dU is the amplitude of the signal with respect to U.

relatively and.

with or and, with, and also the non-orthogonality of these signals leads to second-order errors of smallness, which increases the accuracy of the proposed converter as compared to the known one.

Claims (1)

Invention Formula The converter of the angle of rotation of the shaft into a code containing a sine-cosine rotating transformer, the first and second synchronous detectors, the outputs of which are connected to the corresponding inputs of the analog sum-. mater, the output of the analog adder is connected to the conversion unit voltage or frequency, the outputs of which are connected to the inputs of the addition and subtraction of a reversible counter, the outputs of the bits of the reversible counter are connected to one group of inputs of the first digital adder, the outputs of the first digital adder are connected to the inputs of the Shaper cosine strain output which is connected to one input of the first synchronous detector, a sinusoidal voltage shaper, the output of which is connected to one input of a second synchronous detector, a pulse generator, the outputs of which are connected to another group of inputs of the first, digital adder and to the inputs of a sinusoidal current shaper, the output of which is connected to the winding excitation of a sine-cosine rotary transformer, characterized in that, in order to improve the accuracy of the converter, a phase-shifting element bl ertorov and second digital 2497044 an adder, the outputs of the first and second windings of the sine-cosine rotating transformer are connected to the corresponding inputs of the phase-5 shifting element, the first and second outputs of which are connected to other inputs of the first and second synchronous detectors, respectively, the outputs of the reversing bits 10 counter through a block of inverters connected to one group of inputs of the second digital adder, the other group of inputs of which are connected to the outputs of the pulse generator, and the outputs 15 are connected to the inputs of a shape - sinusoidal bodies, for example. Compiled by A. Smirnov Editor H, Margolina TehredV.Kadar Krrrector.M. Demchik Order 4339/59. Circulation 8J6Subscribe VNIIGO State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Rauschska nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4