RU2316110C2 - Movement to code converter - Google Patents

Abstract

FIELD: automatics and computer engineering, possible use in program control systems, for automatic input of information into a computer.

SUBSTANCE: converter contains phase shifter (1) with two-phased voltage, two outputs of which are connected to zero-organs (2,3), first one of which through delay element (4) is connected to OR element (5), and second one is connected to OR element (5) directly, which is in turn connected to counting input of trigger (9), impulse generator (6), connected to input of counter (7), stage outputs of which are connected to first inputs of coincidence elements (8), second inputs of which are connected to generating element (16). Introduced to the device are second trigger (11), two coincidence elements (10,15), mono-stable multi-vibrator (14) and reverse counter (12). Direct output of trigger (9) is connected to first input of first coincidence element (10), second input of which is connected to output of impulse generator (6), and output - to counting input of second trigger (11), which is in turn connected to reverse counting input of reverse counter (12). Inverse output of first trigger (9) is connected through delay element (13) to input of mono-stable multi-vibrator (14), output of which is connected to first input of second coincidence element (15), second input of which is connected to impulse generator (6), and output - to direct counting input of reverse counter (12), output of which is in turn connected to input of generating element (16).

EFFECT: conversion of movement to digital code; increased precision of movement to code conversion and increased speed of operation due to introduction of blocks for compensating errors.

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Description

The invention relates to automation and computer technology and can be used in software control systems for automatically entering information into an electronic computer (computer).

The present invention is intended to convert movement into a digital code.

Known converters of displacement to code containing a phase shifter, the output of which through a zero-organ is connected to the first inputs of the matching elements, the second inputs of which are connected to the discharge outputs of the counter, the input of which is connected to the output of the pulse generator [Zverev A.E., Maximov V.P. Myasnikov V.A. Converters of angular displacements into a digital code. - L .: Energy, 1974, p.156].

The disadvantage of this device is the low accuracy due to phase shifter errors arising from the instability of its parameters.

The closest in technical essence to the proposed device are displacement-code converters with error correction of the phase shifter, in which two outputs of the phase shifter are connected via phase shifting elements to zero-organs, the outputs of which are connected to the inputs of the trigger, the output of which is connected to the second via a key and a low-pass filter the input of the third zero-organ, the first input of which is connected to the input of the second zero-organ, and the output is connected to the first input of the matching circuits, the second inputs of which are connected to the discharge bubbled counter outputs, the input of which is connected to the output of the pulse generator [Kutyanina VN, Queen AI Angle-code converter for parallel reading with correction of phase shifter errors. Proceedings of MIEM. Devices and automation systems. Issue 26. M: 1972, p. 51].

The disadvantages of the prototype are the long time to generate the corrective signal (several tens of periods of the supply voltage) and insufficient accuracy when changing the frequency of the supply voltage and the instability of the parameters of the phase-shifting elements.

The technical problem that the proposed converter solves is to increase the accuracy of the move-code conversion and speed by introducing blocks that compensate for errors.

The technical problem is solved in that in a converter containing a phase shifter with a two-phase voltage, two outputs of which are connected to zero-organs, the first of which is connected through a delay element, and the second is directly connected to an OR element, which is connected to the counting input of the first trigger, a pulse generator, connected to the input of the counter, the bit outputs of which are connected to the first inputs of the matching elements, the second inputs of which are connected to the forming element designed to issue a pulse, according to the proposed The second trigger, two coincidence elements, a delay element, a one-shot and a reversible counter are introduced to this invention, the direct output of the first trigger is connected to the first input of the first coincidence element, the second input of which is connected to the output of the pulse generator, and the output to the counting input of the second trigger connected to the countdown input of the reversible counter, the inverse output of the first trigger is connected through the delay element to the input of the one-shot, the output of which is connected to the first input of the second element is the same I, the second input of which is connected to the pulse generator, and an output - to the input of the direct count down counter, the output of which is connected to the input of the forming member.

Compared with the prototype, there are no errors in the translation-code conversion. Also, the proposed device has a high speed compared to the prototype.

The invention is illustrated in the drawing, which shows a block diagram of a device.

The proposed Converter for moving the code contains a phase shifter 1 powered by a two-phase voltage U _n1 , U _n2 , null organs 2 and 3, delay elements 4 and 13, OR element 5, pulse generator 6, counter 7, matching circuits 8, 10 and 15, flip-flops 9 and 11 with counting input, single-shot 14, reversible counter 12.

The device in question works as follows.

Phase shifter 1 is powered by voltages:

U _n1 = U _m sinωt,

where U _m , ω are the amplitude and cyclic frequency of the stresses, respectively.

The counter 7 operates continuously from a pulse generator 6. The counter 7 is in phase with the voltage U _n2 so that it is reset at time

where t _n2 is the moment of transition of voltage U _n2 through zero, it is determined from (1) with U _n2 = 0:

τ ₁ is a constant value of the time delay for zeroing the counter 7 (synchronization circuit is not shown in the drawing).

The zero-organ 2 is triggered at the time t ₁ transition through zero of the first output voltage of the phase shifter

The zero-organ 3 is triggered at the time t ₂ transition through zero of the second output voltage of the phase shifter

where U _m1 , U _m2 , ψ ₁ , ψ ₂ are the amplitudes and initial phase shifts of the output voltages of the phase shifter, respectively, ω is the cyclic frequency. Moreover, in the general case (2)

where φ is the measured displacement,

Δφ is the measurement error.

периода Т питающего напряжения U_n1, U_n2, т.е. с временем задержкиDelay element 4 delays the momentum of the null organ 2 by

period T of the supply voltage U _n1 , U _n2 , i.e. with delay time

where T is the period of the supply voltage of the phase shifter, equal to

T = 2π / ω.

Trigger 9 is triggered by a zero-organ 3 pulse at time t ₂ and returns to its original state at time t _{3 by a} pulse from delay element 4. Thus, the pulse duration at the output of trigger 9 is

Where

From (3), (4) it follows that for U ₁ = U ₂ = 0 we get:

Taking into account (5) - (10), we find that a pulse is taken from the output of trigger 9, the duration of which is proportional to the double measurement error:

During this time, output 10 receives the number of pulses equal to

where T _GI , ω _GI - respectively, the period and cyclic frequency of the signals of the generator 6.

Trigger 11 divides this number of pulses in half, receiving the number of pulses proportional to the measurement error Δφ, and feeds them to the input of the counting down of the counter 12. The number of pulses received at the counter is

When the trigger 9 from the pulse of the zero-organ 3 is activated, a signal is sent from its inverse output through the delay element 13 to the single-shot 14. The delay time τ _{3 of} element 13 coincides with the delay time τ _{1 of} resetting the counter

One-shot, triggering at time t ₄ equal to

t ₄ = t ₂ + τ ₃ ,

opens through the coincidence element 15 for the pulses of the generator 6 the input of the direct counting of the reverse counter 12. After n ₁₅ pulses arrive at the counter, with n ₁₅ = n ₁₂ , that is, after a time interval

a single signal at the output of the reversible counter becomes zero at time t ₅ = t ₄ + T _PC .

At this moment, the forming element generates a pulse arriving at the first inputs of coincidence elements 8, the second inputs of which receive the signals of counter 7. Thus, the code a ₁ , a ₂ , ... a _{n of} counter 7, corresponding to the moment, is read from the outputs of elements 8 time t ₅ .

It is easy to see that from the moment of resetting the counter 7 to the moment of reading the information from the converter, the movement-code time elapses

T _φ = t ₂ + τ ₃ + T _PC -t _C ,

or taking into account (2), (10), (14), (15):

Substituting (6), (14), (13), (2 ') in (16), we obtain:

Expression (17) indicates that in the counter 12 there is a compensation of the error Δφ and the constant component π / 2.

Accordingly, the number of pulses received at the counter 7 from the moment t _{C of} its zeroing to the moment t _{5 of} reading information from its output is

или с учетом (17):

or taking into account (17):

It follows that the really proposed displacement-code converter generates a digital signal proportional to the measured displacement φ, providing compensation for errors arising from the instability of the phase shifter parameters, since expression (18) does not contain terms associated with errors.

Claims (1)

A displacement converter into a code containing a phase shifter with a two-phase voltage, two outputs of which are connected to zero by organs, the first of which is connected through a delay element, and the second is directly connected to the OR element, which is connected to the counting input of the first trigger, a pulse generator connected to the counter input, the bit outputs of which are connected to the first inputs of the coincidence elements, the second inputs of which are connected to the forming element intended for issuing a pulse, characterized in that the second a swarm trigger, two coincidence elements, a delay element, a one-shot and a reverse counter, the direct output of the first trigger is connected to the first input of the first coincidence element, the second input of which is connected to the output of the pulse generator, and the output to the counting input of the second trigger connected to the countdown input a reverse counter, the inverse output of the first trigger is connected via a delay element to the input of a single-shot, the output of which is connected to the first input of the second coincidence element, the second input of which is One to the pulse generator, and an output - to the input of the direct count down counter, the output of which is connected to the input of the forming member.