SU1312737A1 - Shaft turn angle-to-digital converter - Google Patents

Abstract

The invention relates to automation and computing and can be used to communicate analog information sources with a digital computing device. In order to increase the speed of a converter containing a sine-cosine rotary transformer (CCTT) 1, digital-to-analog converters 11AP 3 and 4, a differential amplifier 5, a block 6 for converting code to sine and cosine codes, a block 7 for memory, a third DAC 8, a summing amplifier 9, the reversible counter 10, the demodulator 12, the source 17 of the reference voltage, the selector of 2 quadrants, the accumulator 15, the adder 16, the ADC 13, the register 14 and the pulse shaper 11 are entered. DACs 3 and 4 multiply the output signals of the SCRT reduced to the first quadrant by the sine and cosine codes of the output code of the average bits of the reversible counter 10. In the adder 16, the correction code written in advance in memory block 7 is added to the code formed by the accumulator 15 and the lower bits of the reversible counter 10. The output code of the adder 16 is converted into a DAC 8 into a voltage. In the summing amplifier 9, an alternating current signal is generated, the amplitude of which is proportional to the mismatch between the ACS rotation angle 0 and its code equivalent in a reversible counter 10 and accumulator 15 taking into account the instrumental errors of the converter recorded in block 7. The ADC 13 generates an error code from the output signal of amplifier 9 which in accumulator 15 is summed with the previous measurement code. The sign of the error code is generated in the demodulator 12. The clock synchronization pulses are generated twice during the period of the reference voltage in the driver 11. 1 Il. i (L 00 tsD SS vl

Description

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

The aim of the invention is to increase the speed of the converter.

The drawing shows a block diagram of the converter.

The converter contains a sine-cosine rotating transformer (CCTT) 1, a quad selector 2, the first 3 and second A digital-to-analog converters (DAC), a differential amplifier 5, a code conversion unit 6 to sine and cosine codes, a memory block 7, a third DAC 8, summing amplifier 9, reversible counter 10, shaper 11 pulses, demodulator 12, analog-to-digital converter (ADC) 13, register 14, accumulator 15, adder 16, reference source 17.

The Converter operates as follows.

Signals from the output of the SCRT, proportional to the sine and cosine of the measured angle, are sent to the quadrant selector 2, which in the f state of the two most significant bits of the output code of the reversible counter 10 produces on its analog outputs signals corresponding to the trigonometric functions sinu, cos of the first quadrant of the measurements angle.

Signals 81pl and conv) are fed to the analog inputs of digital-to-analog converters 3 and A, where they are multiplied by a digital code equivalent to the cosine and the sine of the V, code respectively. Functional conversion of the Y code is performed by block 6 of the sine-cosine transform. if cos (and cos t sin If from the output of the differential amplifier 5 is fed to the second input of summing amplifier 9, to the first input of which a signal is output from the output of the digital-to-analog converter 8, which is the product of the reference signal Ujj drove to the output code adder 16,

The output code of the adder 16 is the difference of the digital code i / formed by the group of outputs of the accumulator 15 and the lower bits of the reversible counter 10, and the digital code of the correction d corresponding to inst7372

the error of the converter and the memory selected from the correction block 7 by the Lf and f code of the higher bits of the counter 10. At the output

5 summing amplifier 9 produces an error signal U, proportional to 8in (Lf) - - s /,

With small misalignment code reversible counter 10 with an angle

About turning SKVT TS U (V ,, H,

+ If) - (/, The correction code of the amendment contains information about the errors of the si-, nous-cosine converter 1, the errors of the selector of 2 quadrants,

 DAC 3 and 4 and differential amplifier 5,

The former 11 generates a sequence of counting pulses with a doubled frequency of the reference voltage. In this case, the leading edges of the counting pulses coincide with the maxima of the half-waves of the voltage U. A demodulator 12 across the voltages U and a reference Up generates a mismatch sign signal. The signal U from the output of the summing amplifier 9 is fed to the inputs of the ADC 13, consisting of a comparators unit, the outputs of which are connected to an encoder that forms

 arithmetic binary error code (not shown).

The output signal of the ADC 13 is fixed in register 14 in each cycle by a signal from the output of the block and is fed to accumulator 15, where the shapef is the difference between the current and previous values and the transfer signal to the subsequent bits of the reversible counter 10.

The transformer operates cyclically, with the appearance of each output pulse of the former 11, a cycle is organized to obtain the result of the conversion. The speed of the converter is increased by reducing the time needed for the processing of the error signal in the A / D converter 13.

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Claims (1)

Invention Formula The rotation angle converter led to a code containing a sine-cosine rotating transformer, the input of which is connected to the output of the reference voltage source, a reversible counter, the first and second group of outputs of which are connected to the inputs the memory unit, the second group of outputs is connected to the inputs of the code conversion unit into sine and cosine codes, the first and second groups of the output are connected to the digital inputs of the first and second digital-analog converters, the outputs of the first and second digital-analog converters are connected to the inputs of the differential amplifier , the third digital-to-analog converter, the output of which is connected to the first input of the summing amplifier, a demodulator, one input of which is connected to the source of the reference voltage, similar to the fact that, in order to increase the speed of the converter, a quad selector, a drive, an adder, an analog-digital converter, a register and a pulse shaper are entered into it, the outputs of a sine-cosine rotating transformer are connected to the information inputs of the quadrant selector, the control inputs of which connected to the first group of outputs of the reversible counter, and the first and second outputs are connected to the analog inputs of the first and Editor A. Shandor Order 1979/56 Compiled by M.Sidoro & a Techred L.Oleinik Corrector Circulation 902 Subscription VNIIPI USSR State Committee for inventions and discoveries P3035, Moscow, Zh-35, Raushsk nab., d.A / 5 Production and printing company, Uzhgorod, Projecto st., 4 five five The second digital-to-analog converters, the outputs of the memory unit are connected to the first group of inputs of the adder, the third group of outputs of the reversible counter and the group of outputs of the storage device are connected to the second group of inputs of the adder, the outputs of the adder and the output of the source voltage source are connected to the digital and analog inputs of the third digital-analog output, respectively. the converter, the output of the differential amplifier is connected to the second input of the summing amplifier, the output of which is connected to another input of the demodulator and the analog input logo-to-digital converter, analog-to-digital converter outputs are connected to the information inputs of the register, the output of the reference voltage source through the pulse driver is connected to the synchronizing inputs of the accumulator and the register, the output of the demodulator is connected to the register sign, off group the drive inputs, the first and second outputs of the drive are connected to the inputs of the addition and subtraction of a reversible counter. the input of the drive which drives are connected Corrector S.Cherni