SU1363472A1 - Code-to-shaft angle converter - Google Patents

Abstract

The invention relates to automation and computer technology and can be used to connect digital computing devices with analog actuators, with the aim of improving accuracy by reducing the effect of instability of a digital-to-tax converter in a code converter in a rotation angle of a shaft containing a sine-cosine rotating transformer ) 1, switch 2 quadrants, digital-to-analog converter (D / A converter) 4, amplifier 6, engine 7, gearbox 8, reference source 9, register 11, b ca. 12 functional code conversion, an analog switch 3, a low-pass filter 5, a comparator 10 and a digital switch 13 are entered. Switch 2 generates the signals of SSCT 1 corresponding to the first quadrant, and block 12 from the input bits code forms proportional to sine and cosine . In the first half period of the reference voltage with c (L with O5 oo 4; ND

Description

The DAC 4 inputs receive analog sine and digital cosine signals, and in the second half period, the analog cosine and digital sine signals of DAC 4 operate in the multiply mode of the input signals. At the output of the filter 5, the constant component of the difference output 1 is

The invention relates to automation and computing technology and can be used to communicate digital devices with computing devices with analog actuators,

The purpose of the invention is to increase the accuracy of the converter by reducing the influence of the instability of the digital-to-analog converter (D / A converter),

The drawing shows a block diagram of the converter

The code converter to the shaft rotation angle contains a sine-cosine rotary transformer (SSCT) 1, switch 2 quadrants, analog switch 3, D / A converter 4, low-pass filter 5, amplifier 6, motor 7j gear 8, reference source 9, comparator 10, register 1 1, functional code conversion unit I2 and digital switch 13,

The Converter operates as follows.

The angle about, to which the rotor of the SKVT 1 is to be deployed, is represented in register 11 by code N, consisting of code N, most significant bits and code N of the most significant bits. The first input of switch 2 from the output of SCPT 1 receives a signal and sinoi, and the second input and cos .rfle and U sinwt - output voltage of source 9, From the output of switch 2, the output signals of SCPT 1, brought to the first quadrant, go to analog inputs switch 3, Block 12 of the input code N forms codes cos N and sin N, the Comparator 10 of the reference voltage source 9 forms a rectangular

The DAC 4 voltages in two half-periods are proportional to the sine of the mismatch between the angle of the SSCT 1 and the input code. This component through the amplifier 6 acts on the motor 7, which drives the shaft of SSCT 1 in the coordinated position, 1 slug.

impulses with the same period and duty cycle 2,

In the first half-period of the reference voltage, the signals of the DAC 4 receive 5 signals and sin (oi.- N,) and cos N., and in the second half-period - signals U cos (((L-N,) and sin N, DAC 4 in the mode of multiplying the input signals to the analog and

0 digital inputs. At the output of the filter 5, a constant component of the difference between the output voltages of the DAC 4 in the I two half periods is proportional to sin (ot - N). The output constant voltage of the filter 5 through the amplifier 6 acts on the engine 7, which through the gearbox 8 deploys Shaft of the SQUT 1 to eliminate the mismatch between about and No

0. In such a converter, the instability of the D / A converter 4 equally affects the gain for the positive and negative signals in two half-periods and therefore is coded about

F o rmula from brute and and

The code converter to the angle of rotation of the shaft containing a source of voltage, the outputs of which are connected to the rotor winding of a sine-cosine rotating transformer, and its stator windings are connected to the information inputs of the quad switch, the register whose inputs are the inputs of the converter , the outputs of the higher register bits are connected to the control inputs of the quad switch, and the outputs

lower-order bits to the functional code conversion unit, digital-analog converter, ycHnH body, the output of which is connected to a motor kinematically connected with a rotor of a sine-cosine rotating transformer, characterized in that, in order to improve the accuracy of the converter, an analog a switch, a digital switch, a low-pass filter and a comparator, the inputs of which are connected to the outputs of the reference voltage source, and the output is connected

Editor AoOgar Order 6380/54

Compiled by M.Sidorova Tehred L. Serdyukova

Corrector

Circulation 900 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab ,, d, 4/5

Production and printing company, Uzhgorod, Projecto st., 4

the analog and digital switch control inputs, quad switch outputs are connected to the analog switch information inputs, the output of which is connected to the analog-to-digital converter, the function conversion unit outputs are connected to the digital switch information inputs, digital-to-digital switch outputs to digital inputs of the digital-analog converter whose output through a low-pass filter is connected to the input. Amplifier.

Proofreader

Claims (1)

Claim Code converter into a shaft rotation angle, containing a reference voltage source, the outputs of which are connected to the rotor winding of the sine-sine rotary transformer, and its stator windings are connected to the information inputs of the quadrant switch, the register whose inputs are the converter inputs, the outputs of the highest register bits are connected to the control the inputs of the quadrant switch, and the outputs of the least significant bits to the block of functional code conversion, a digital-to-analog converter, an amplifier, the output of which о connected to an engine kinematically connected to the rotor of a sine-cosine rotating transformer, characterized in that, in order to increase the accuracy of the converter, an analog switch, a digital switch, a low-pass filter and a comparator are introduced into it, the inputs of which are connected to the outputs of the reference voltage source, and an output connected to the control inputs of the analog and digital switches the switch outputs are connected to quadrants yn formational ₅ inputs an analog switch whose output is connected to the anal govomu input of the digital to analog converter, the outputs of functional unit conversion codes U are connected to data inputs of a digital switch, the outputs of a digital switch - to the digital inputs of digital to analog converter, the output of which through the low pass filter 15 frequencies connected to the input of the amplifier,