SU536501A1 - Motion to code converter - Google Patents

Description

one

Findings related to automation and measuring equipment can be applied to measure the movement of working bodies of metal-cutting steels.

Widespread use of displacement transducers into a code using multipole goniometric preo, angle-scale drivers (sine-cosine, rotating transformers, inductosines, etc.) operating in amplitude mode is used as a displacement transducer.

A device of this type consists of a displacement sensor, the inputs of which are connected to the outputs of a function code-voltage converter controlled by a reversible counter code. The output of the sensor through an amplifier is connected to a phase-sensitive rectifier that controls the operation of the generator connected via a logic device to the input of the reversible counter 1. These converters do not have high performance.

The closest technical solution to this is a displacement transducer into a code containing a pulse generator, the output of which is connected to the inputs of the reversible counter through the amplifier-former, the outputs of one of them are connected to the inputs of the display unit, the outputs of the matching unit are connected to the inputs of the sensor

displacement, the output of which is connected to the input of the amplifier 2 through the low-pass filter.

However, the converter has limited accuracy and is very complex. This is due to the fact that a digital-to-analog converter is used, which requires a large number of precision keys and transponders manufactured according to special technology to be realized.

The aim of the invention is to improve the operation accuracy and simplify the converter.

This is due to the fact that

The converter has a code comparison unit, a pulse shaper, a trigger, decipherors, and a secondary reversing counter, the outputs of which are connected through a code comparison block to the inputs of the pulse shaper and, through decoders, to the trigger inputs, the outputs of which are connected to the same inputs of the additional reversible counter and the inputs of the trigger form, and the outputs of which are connected to the same inputs of the additional reversible counter and to the inputs of the trigger forms, which outputs are connected to the same inputs of the additional reversible counter and to the inputs of the trigger formors that are connected to the same inputs of the additional reversible counter and to the inputs of the trigger formors that are connected to the same inputs of the additional reversible counter and to the inputs of the trigger forms, which outputs are connected to the same inputs of the additional reversible counter and to the inputs of the trigger forms, which outputs are connected to the same inputs of the additional reversible counter and to the inputs of the additional inverters that are connected to the same inputs of the additional reversible counter impulses, the second inputs of which

connected to one of the outputs of another reversible counter, the other outputs of which are connected to other inputs of the code comparison unit, the pulse generator is connected to the counting input of the additional reversible counter.

FIG. Fig. 1 shows a schematic of the transducer (movement pad into the code; Fig. 2 shows timing diagrams explaining the principle of working the converter.

The displacement transducer to the code contains a sensor / displacement, such as a sinus-cosine rotary transformer or inductosin; low pass filter 2; amplifier shaper 5; ImulsoV 4 generator; reversible counters 5, 6; unit 7 comparison of codes; display unit 8; reversible counter 9; decoders 10, 11; trigger 1: 2; pulse shaper 13; matching block 14.

The output winding of the displacement sensor J through the filter 2 of the lower frequencies is connected to the input of the amplifier-former 3, to the other input of which the output of the pulse generator is connected; the output of the shaping amplifier 3 is connected to the input meters of the first and the second reversing counter 5 and 5, respectively.

Code outputs. Per: Vogo Rvvaroi: V.n.nogo counter connected to the first 1 input block

7oravnen.and codes, and code outputs of the second reversible counter are connected to the unit

8indications. The second inputs of the code comparison unit 7 are connected to the code outputs of the additional reversible counter 9, the counting input of which is connected to the output of the pulse generator 4. The code outputs of the additional reversing counter 9 are also connected to the inputs of the first and second decipherors 10, 11, corresponding to The output of the first decoder .10 is connected to the single input of trigger 12, and the output of the second decoder 11 to the zero input of this trigger. The single output of trigger 12 is connected to the input of the setting of the mode of addition of the reversible counter 9, and the zero output is connected to the input of the installation of the mode of readout and this reversible counter. The outputs of the trigger 9, the outputs of the code comparison unit 7 and the outputs of the two high-order bits of the reversing counter 5 are connected to the inputs of the pulse generator in 13, the outputs of which are connected to the sensor / movement inputs via matching unit 14.

The motion to digital converter operates as follows.

A reversible counter 5 stores a number proportional to the current position of the sensor / displacement rotor. This number in the direct and reverse codes goes to block 7 of the code comparison. Forward inputs and reverse codes of the number of the reversible counter 9 also go to the second inputs of this block.

The counting input of the reversible counter 9 continuously receives pulses from the generator 4. These pulses, depending on the signals of the trigger 12, either cause an increase in the number in the reversing counter 9, or its increase.

Suppose at the considered time the number in the counter 9 increases. At that moment, when all the triggers of the counter 9 are in single states, a signal appears at the output of the decimator //, which triggers the il2 trigger to the opposite state. Trigger 12, by its output: it sets. In a reverse counter, the subtraction mode. And iBce, the subsequent pulses received at the input of this counter, causes a decrease in the number in it, until

the counter triggers will not appear in zero states.

In this case, a signal appears at the output of the decoder 10, which triggers trigger 12 to its initial state and, thus, is set, it injects 9 counters into the counter. Thus, the number .in the reversible counter 9 as a function of time. Changes according to a triangular law, linearly varies from O to L / .ax and then liiyno, decreasing, from / V „ax to O

(see Fig. 2, a).

Block 7 of the comparison box has two channels. The first compares the direct code of the linearly changing number of the reversible counter 5 with the direct code of the number of the reversible counter 5. iB the moment of equality of these codes, block 7 outputs the signal Spp (see Fig. 2, e). In the second channel, the forward code of the linearly varying number of the reversible counter 9 is compared with the reverse code of the number of the reversible

counter 5. At the moment of the validity of these codes, a signal is generated (see Fig. 2, e). The operation logic of the code comparison device 9 is described by the following boolean expressions:

(Q, -F,

35 C, (Q, .F, VQ-F) (Q “.F ,, VQ., Coll (Qi, F)

where SPR Sobr - output signals of the block

comparing codes 7;

QI ... .Qn is the parallel code “of the number of the reversible counter 9; FI .... RP - parallel code of the number of the reversible counter 5.

The signals Spr, Colr and signals from the outputs of the trigger. 12 are received and the inputs of the pulse shaper 13. In addition, the output signals of the two higher additional bits of the reversible counter 5 (Pn + Fn + z) are also received - The number is stored in these bits indicating which sensor / position rotor is in the quadrant. The pulse shaper 13 produces the formation of two pulse signals, the amplitudes of the first harmonics of which vary in sine and cosine laws as a function of the numbers stored in the reversible counter 5.

From the outputs of the pulse forming signal, the signals (sin a) and (cos a) are fed through the matching stages to the sensor / position inputs.

Voltage mismatch with the output

winding sensor 1 postapa.et position in

lowpass filter 2, where the first harmonic selection occurs. Harmonic

the signal further enters the amplifier-shaper 3, where it is amplified and, depending on the phase, the formation of a pulse signal.

The differential pulse signal then arrives at the reversible counter 5 and causes a change in the number in it until the angle (a) stored in the counter 5 becomes equal to the angle of rotation of the rotor of the position sensor. At (), the output voltage of the sensor is O, and there is no pulse signal at the output of the amplifier-former.

The differential pulse signal is simultaneously counted by a counter 9 controlling the display block 8.

. Compared with the prototype, the proposed converter has higher accuracy characteristics.

Claims (1)

1. V. P. Zverev et al. “Converters of angular displacements into a digital code. L., Energie, 1974, p. 138. 2. 26-16 Olivetti. Guide to installation, use and maintenance. Spare parts (prototype). . y / y rbZ To i b BUT. 1-1- -trlrf d-lnL. L - “.; Well Sind CoScA Hnpl 5 ficSp C5 / MOH: ii. M-D- .: FR W / (5 k / f and g Vj-i