SU1438000A1 - Shaft angle digitizer - Google Patents

Abstract

The invention relates to automation and computing and can be used to connect analog information sources with a digital computing device. In order to improve the accuracy of the shaft angle converter into a code containing a sine-cosine rotary transformer (CCWT) 1, comparator 2, two phase-sensitive rectifiers 3 and 4, trigger 9, block 15 of functional code conversion, register 16 of consecutive

Description

ate

with:

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, comparator 19, voltage source 21, voltage-to-frequency conversion blocks 5 and 6, pulse generator 7, frequency divider 8, trigger 10, OR elements 11, 12, frequency multipliers 13 and 14, conversion blocks 17 and 8 are entered frequency in the code and the element OR 20, the Comparator 19 is digital, SCHWT 1 generates two AC signals, amplitude modulated as a function of the sine and cosine of the rotation angle oi. Phase-sensitive sensors 3 and 4 convert AC signals to DC signals. At the outputs of blocks 5 and 6 of the FPUs, pulse sequences are formed with a frequency proportional to the module of the sinus and

cosine stresses, one of two outputs, depending on the sign of the sine and cosine stresses. At the outputs of flip-flops 9 and O, a code of two higher bits is formed. In multipliers 13 and 14, the input frequency is converted in accordance with the cosine and sine of the output code N. , register 16, In each clock cycle, the frequency is converted into a code in blocks 17 and 18, a comparison of the codes obtained in the comparator 19 and the formation of one code N code of the lower bits in register 16, I il.

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This invention relates to automation and. computer technology and dp can be used to connect analog information sources with a digital computing device.

The purpose of the invention is to increase the accuracy of the converter by eliminating two digital-to-analog converters and an analog comparator, which have significant instrumental error.

The drawing shows a block diagram of the converter.

The shaft rotation angle-to-code converter contains a sine-cosine rotating transformer (CCT) 1, the first analog comparator 2, phase-sensitive rectifiers 3 and 4, voltage-to-frequency blocks 5 and 6, a pulse generator 7, divider 8 frequencies, flip-flops 9 and 10, OR elements 11 and 12, frequency multipliers 13 and 14, block 1 functional code conversion, register 16 successive approximations blocks 17 and 18 frequency conversion and code, digital comparator 19, OR element 20 and source 21 support stresses.

The Converter operates as follows.

At the outputs of the ACS 1, alternating voltages are produced with a frequency of

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source voltage 21 and amplitude modulated as a function of the sine and cosine of the angle of rotation of the shaft SQUT 1. In phase-sensitive rectifiers 3 and 4, the alternating current signals are converted into direct current signals, proportional in amplitude to the sine and cosine of the oL angle. Blocks 5 and 6 of the PNCs form a sequence of pulses with a frequency proportional to the input voltage module, according to one of the two outputs, depending on the sign of the input voltage. Triggers 9 and 10 form two high-order bits of the output code in accordance with the sine and cosine signs of the output voltages of the phase-sensitive rectifier. Lei 3 and 4, impulses from the outputs of block 5 of the FNP through the element ShZh 11, a. from the outputs of block 6 PNC through the element OR

12 enter the multiplier inputs

13 and 14 frequencies, respectively. The multipliers 13 and 14 are made on the basis of binary multipliers, controlled by the output code Cos N and sin N 15,

The coding cycle starts on a signal coming from the output of the higher bit of the frequency divider 8 through the element OR 20 to the register resolution 16 input. The converter works by the method of balancing in accordance with the dependence

sinoi-cos N - cosoi sin N 0, which is realized in the area corresponding to the quadrant of the angle oL. The output pulses of multipliers 13 and 14 with a frequency sin ut cos N and cos о sin S, respectively, are sent to the information inputs of blocks 17 and 18, to control the inputs of which receive a signal from the output of the divider 8, the duration of which is equal to one conversion cycle in blocks 17 and 18. Digital comparator 19 compares the output codes of blocks 17

first, second and third OR elements, first and second frequency multipliers, first and second frequency conversion units to code, the second comparator is digital, the first and second outputs of the sinus-sinus rotary transformer are connected to the second inputs of the first and second phase-10 sensitive rectifiers, respectively, the outputs of which are connected to the information inputs of the first and second voltage-to-frequency blocks, respectively, the first and the second. As a result, in the register 16 for- 15 and the second outputs of the first block And, the transcode code of the lower-order voltage is transformed into the frequency of the connections, until the input codes of the digital comparator 19 are not equalized and the signal of the equality of the input codes is generated. This signal, through the OR element 20, enters the registrar section 16 and indicates the end of the conversion cycle,

As a phase-sensitive rectifier, a two-channel microassembly of the MD-4 type (BDZ 430 002) with an error of less than 0.02% can be used, and in, as the PNC blocks, a two-channel block of the BK-59 type (6D2 222 066) with an error of less than 0 , 05%, in the temperature range from -60 to +80 ° C. The remaining elements of the converter are digital and, if used correctly, do not affect the accuracy.

Claims (1)

Invention Formula the pulse generator is connected to a syncrometer of the rotation angle of the shaft 40 by the clock inputs of the first and second to the code containing the sine-cosine transformation blocks of the forward-rotating transformer: and the first one to the frequency and to the input of the divider-comparator, the inputs of which are connected, the first ones the output of which is connected to the output of the source of the reference voltage with the control inputs of the first and none, the output of the first comparator connects the 45 second frequency conversion units to the first inputs of the first and second to the code and the second input of the reg Stra post- first, second and third OR elements, first and second frequency multipliers, first and second frequency conversion units to code, the second comparator is digital, the first and second outputs of the sinus-sinus rotary transformer are connected to the second inputs of the first and second phase-sensitive rectifiers respectively, the outputs of which are connected with inneny with the first and second inputs of the first trigger, respectively, and through the first element OR. With the analog input of the first frequency multiplier, the output of which is connected to the information input of the first frequency-to-code conversion unit, the first and second outputs of the second voltage-to-frequency conversion unit are connected to the first and second inputs of the second flip-flop, respectively, and through the second CM element with the analog input of the second smart frequency, the output of which is connected to the information input of the second frequency-to-code conversion unit, the outputs of the first and second frequency-to-frequency conversion units are connected to the inputs of the second omparatora, the first and second outputs of which are connected to the first inputs of the sequential approximation register and the third element OR, respectively, the output