SU1334373A2 - Shaft angle of turn converter - Google Patents

Abstract

The invention relates to devices for converting the angle of rotation of a shaft to a code with sine-cosine angle sensors, in which information about the angle is represented as voltages proportional to the sine and cosine of the angle. The purpose of the invention is to increase the reliability of the converter due to the continuous automatic control of the correctness of the output code during operation. The goal is achieved by the fact that in the converter of the angle of rotation of the shaft into a code containing a sine-cosine sensor 1, determinant of octants, 2, analog switch 3, analog-to-digital converter 4, persistent memory 5, block 6, EXCLUSIVE OR, register 7 output code, the second analog switch 8, the second block 9 of the EXCLUSIVE OR element, the second permanent storage device 10, the digital-to-analog converter 11 (D / A), the amplifier 12, the comparator 13 are additionally introduced. with the exception of the first three high-order bits, they are converted into the tangent code of the angle given in the first octant, which is multiplied by the DAC with an output voltage of the SKDU proportional to the cosine of the angle given in the first octant by the value of the first three high-order bits of the angle code. The difference between the maximum voltage of the DAC and the voltage of the SKDU proportional to the sine of the angle given in the first octant is compared with the threshold voltage specified from the permissible error of the converter. If the converter error exceeds the permissible level, a zero signal is generated at its output, meaning that there is a malfunction that can be used to turn on the signaling device or the backup converter, which eliminates the possibility of emergency situations in the SKDU system with the digital computing device. 1 il. (L co co oo J 00 N

Description

one

The invention relates to automation and computer technology and can be used to connect analog information sources with digital computing devices.

 The purpose of the invention is to expand the functionality of the converter by ensuring that the output code is monitored during operation and outputting a signal from the converter to a digital sensing device.

The drawing shows a block diagram of a converter.

The converter contains a sine-cosine rotary transformer 1 (SCWT) j determinant 2 octants, analog switch 3, ADC 4, ROM 5 block 6 elements EXCLUSIVE OR, register 7, analog switch 8, block 9 elements EXCLUSIVE OR,: ROM 10, DAC 11 , amplifier 12, comparator 13, voltage divider 14, reference source 15, voltage. The following notation is accepted: 9 is the angle of rotation, jb is the angle 0, given in the first octant.

The outputs of the determinant 2 octants are connected to the inputs of the higher bits of the register 7, and the output of block 6 is connected to the inputs of the lower bits of the register 7. At the output of the register 7, the code N is generated, where D is the angle code generation error.

The output signals of SSCT 1 are connected to the information inputs of the analog switch 8, the control inputs of which are connected to the outputs of the first three most significant bits of the register 7. At the outputs of the switch 8, voltages proportional to the sine are generated

and cosine of p.

(,

The outputs of register bits 7, except for the first three high-order bits, are connected to the information inputs of block 9 EXCLUSIVE OR, whose control input is connected to the output of the least significant bit of the number of outputs of the first three most significant bits of the register 7. At the output of block 9. code N, 2 | ± l,

The outputs of block 9 are connected to the inputs of the ROM 10, in which the table values of the function tg are written from 0 to 1 when the input code changes from zero to the maximum value. At the output of ROM 10, a code N tg (± ± L) is formed.

343732

The outputs of the ROM 10 are connected to the digital inputs of the multiplying DAC 11, the output of which produces an analog voltage equal to the product of the signals at its analog and digital inputs.

The output voltage of the D / A converter 11 is connected to the summing input of the amplifier) 12 in the differential connection, at the output of which a voltage equal to the difference of the input voltages is formed, i.e.

15

  tg (}, t Л) cosf} - sin / J

With the values of and 0.05 rad V,; Ь ± U PP with an error not exceeding 50% in the whole range of the angle change | 5.

The output voltage of amplifier 12 is connected to the first input of comparator 13, the second input of which is connected to the output of voltage divider 14, the input of which is connected to a source of reference voltage. Divider 14 has a transmission coefficient K. A voltage is generated at its output

V

14

 K v.

0 The comparator 13 compares the output voltage of the amplifier 12 with the output voltage of the divider 14. If / V, / i i V, 4 s the output of the comparator 13 produces a zero signal. If / V, / m output of the comparator 13 is generated a single signal. The comparator 13 can be implemented on the basis of two integral comparators, one of which compares uni-polar pQ signals, the other - opposite polarity, and their outputs are combined according to the scheme I.

The Converter operates as follows.

5 The output signals of ACS 1 are compared with the zero level and with each other, as a result of which the octant number is determined, in which angle 9 is located. By the known octant number, analogue switch 13 generates signals proportional to sine and cosine of an angle}. The linear tangent code of this angle is generated by linear analog-digital conversion, and with the aid of ROM 5, the angle code is determined. By inverting the angle / 3 code in even octants, block 6 generates the lower digits of the angle b code, which, together with the octant code, give

31

at the output of the register 7, the code of the angle 9 with some error a.

According to the known octant number of angle 9 from register output 7, analog switch 8 generates signals proportional to sine and cosine of angle 6 given in the first octant. By inverting the lower bits of the angle code 9 in even octants, block 9 generates an angle code (t D). ROM 10 determines the code tg (p, t), which is multiplied by the DAC 11 with the cosine voltage of the switch 8. The difference between the output voltage of the DAC 11 and the sine voltage of the switch 8 is compared at the comparator 13 with the threshold voltage, which is set by the divider 14, based on the allowable error value of the converter. If the error of the converter exceeds the allowable level, the condition / L / K is satisfied and a single signal is generated at the output of the comparator 13, indicating a fault that can be used to turn on the signal device or the backup converter, which eliminates the possibility of emergency situations in the analog communication system sensor with DVR.

Thus, in the proposed converter, as compared to the known one, the functionality is enhanced by continuously monitoring the accuracy of the output code during operation.

Claims (1)

Invention Formula The converter of an angle of rotation of a shaft with control of the output code on Editor I. Casard Compiled by E.Zamolodchikov Tehred V. Kadar Proofreader L. Bezkid Order 3980/57 Circulation 901 Subscription VNSHSHI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5 Production and printing company, Uzhgorod, st. Project, 4 20 34373 auth. St. No. 1076935, characterized in that, in order to expand the functionality of the converter by providing control of the output code, a second analog switch, a digital-to-analog converter, a second permanent memory, an amplifier, a comparator, a voltage divider, and a second block of elements EXCLUSIVE OR, whose information inputs are connected to the p-3 outputs of the lower bits of the register,  A control input is connected to the low-order output of the three most-high-order bits of the register, and the outputs are connected to the inputs of a second permanent storage device whose outputs are connected to digital inputs of a D / A converter whose output is connected to the first input of the amplifier whose output is connected to the first input the comparator, the second input of which is connected to the output of the voltage divider, the input of which is connected to the source of the reference voltage, the first and second outputs of the sine-cosine rotational rotation 30 transformers are connected respectively to the first and second information inputs of the second analog switch, the control inputs of which are connected to the outputs of the three most significant bits of the register, and the first and second outputs are connected respectively. directly to the second input of the amplifier and the analog input of the digital-to-analog converter, the comparator output is the control output of the converter. ; 25 35 40