SU1732449A2 - Device for monitoring of multichannel pulse sequences - Google Patents

Abstract

Usage: in the systems of automatic control of digital and analog devices. The aim of the invention is to expand the functionality of the device by allowing the control of both pulsed and analog signals. This ensures a reduction in the duration of the monitoring cycle in the presence of faulty channels by adapting the analysis time of each channel and reducing the monitoring time of channels with variable voltage. The goal is achieved by introducing into the device a control unit 8 and switching between the output of multipexor 5 and the input of accumulator 6 of a sequential chain of nonlinear element 10 and comparator 9. In addition, the device includes fault recorder 1, OR element 2, one-shot 3, counter 4 and one-shot 7 restart. 2 Il.

Description

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The invention relates to a pulse technique, is intended for use as a device for controlling multichannel pulse sequences and / or variable voltages in automatic control systems for digital and analog devices, and is an improvement of the known device according to Aut. St. No. 1624674.

A device for controlling a multichannel pulse sequence is known, containing a one-shot, counter and multiplexer, the control inputs of which are connected to the outputs of the corresponding counter bits, and the information inputs are device inputs, as well as the fault recorder, the OR element, the one-shot restart and a drive whose input is connected to the multiplexer output, and the output is combined with the first input of the OR element and connected to the input of the odiovibrator with a restart, the output of which is connected to the input dy odnovibre- tore whose output is combined with a second input of the OR gate and the reset input of the accumulator, and also connected to the control input fault memory, data inputs of which are connected to the outputs of the respective bit rows counter whose clock input connected to the output OR gate.

However, the known device does not allow control of variable voltages.

The aim of the invention is to expand the functionality of the device by allowing control of both pulse signals and alternating voltage, reducing the duration of the monitoring cycle in the presence of faulty channels by adapting the analysis time of each channel, and also reducing the time monitoring of channels with variable voltage.

This goal is achieved in that a device for controlling multichannel pulse sequences containing a one-shot. a counter and a multiplexer, the control inputs of which are connected to the outputs of the corresponding bits of the counter, and the information inputs are the inputs of the device, as well as the fault recorder, the OR element. a one-shot restart and a drive whose input is connected to the multiplexer output, and the output is combined with the first input of the OR element and connected to the input of a one-shot restarting, the output of which is connected to the input of the one-vibration one, the output of which is combined with the second

the input of the OR element and the reset input of the accumulator, as well as connected to the control input of the fault recorder, whose information inputs are connected to the outputs of the corresponding counter bits, the synchronization input of which is connected to the output of the OR element, the control unit is inserted, and between the multiplexer output and the accumulator input is on a serial chain of a nonlinear element and a signal comparator, the input of the reference voltage of which is connected to the first output of the control unit connected by the second output to the auxiliary The single input of the one-shot with overwriting, and the control inputs with the corresponding outputs of the pulse counter.

Fig, 1 shows the functional

0 device diagram; in fig. 2 - time diagrams of signals at various points of the circuit: a - signals at the output of the multiplexer, b - signals at the input of the comparator, c - signals at the input of the accumulator, g - signals at

5 input one-shot with restart, g - signals at the input of one-shot. e - signals at the output of the one-shot. W - signals at the output of the element OR.

The device for controlling multichannel pulse sequences contains fault recorder 1, element OR 2, one-shot 3, counter 4, multiplexer 5. drive 6, one-shot 7 with restart, control block 8,

5 comparator 9, non-linear element 10 and input terminals 11,

Multiplexer 5, non-linear element 10, comparator 9. accumulator 6. single-vibration 7 with restart and one-shot 3 are connected one after another. The output of the one-shot 3 is connected to the control output of the recorder 1. the first input of the element OR 2 and the reset input of the accumulator 6, the output of which is also connected to the second input of the element OR 2, the output of which is connected to the input of the counter 4, the outputs of the corresponding bits of which are connected to the information the inputs of the fault recorder 1, the control inputs of the multiplexer 5, the information inputs of which are connected to the device input terminals 11 and the control inputs of the control unit 8, the first output of which is connected to the reference input 5 do comparator 9, and the second output - to l yuschemu controlled entry odRyuvibratora 7 to restart.

In the proposed device, the multiplexer can be performed using chip K590KN6, and the counter

pulses - using the chip K561IE10.

Element OR can be performed on a specialized chip K561LE5.

A one-shot and one-shot with restart are advisable to run on a dedicated K564AP chip — two waiting multivibrators with pre-set and restart control inputs.

The drive can be made on the chip K56IE8.

The fault recorder can be made using the K564ID5 microcircuit and the seven-segment liquid crystal indicator IZHTSZ-6/7, with the E input of the K564ID5 microcircuit (pin 1) being used as a control input of the malfunction recorder.

It is advisable to perform the comparator on a specialized K521SAZ chip.

The nonlinear element can be made using an K1400UD1B operational amplifier or using a specialized K525PS1 chip.

The control unit can be made on the basis of two microcircuits K590KH6, the control inputs of which are combined and form the control inputs of the control unit. The information inputs of the first microcircuit are connected to the potentiometer sliders, from which the reference voltage for the comparator is removed, which from the output of this microcircuit goes to the first output of the control unit. Using the second microcircuit K596KH6, one of the group of additional resistors (or capacitors) is connected to one of the two time drivers of the one-shot with restart; the output of the second chip is the second output of the control unit.

The device works as follows.

The drive 6 accumulates a predetermined number of pulses of the monitored sequence. After the K-th pulse arrives at its input, the output pulse of accumulator 6 is formed and its self-reset to the initial (zero) state.

A single-shot 7 with restart limits the analysis time of the monitored channel. After the analysis of the channel expires, the one-shot 7 with a restart produces a trigger signal of the one-shot 3, which forms a short pulse. The analysis time Ta should not be less than the maximum required accumulation time, t, e.

Ta

5 where cmin is the smallest pulse frequency in a controlled sequence.

The fault recorder 1 displays the numbers of the faulty ones.

0 channels. The recording of the number of the faulty channel is carried out from the information inputs by a pulse arriving at its information input.

In the initial state of the device on

5, the output bus of the counter 4 has a code that is fed to the control inputs of the multiplexer 5 and the control unit 8. As a result, one of the monitored channels is connected through

0 multiplexer 5 to the input of the comparator 9, the reference input of which receives the reference voltage from the first output of the control unit 8 (Fig. 26). The control unit 8 forms a reference at its first output.

5, the voltage required to estimate the amplitude of the monitored signal (pulsed or alternating, for example, sinusoidal), which makes it possible to increase the reliability of control of the amplitude of the signals.

From the output of the comparator 9, the pulses generated by it are fed to the input of accumulator 6. After the K-ro pulse arrives at the accumulator input, the output pulse is formed (Fig. 2d) ti), which starts the one-shot 7 with restart and also through the element OR 2 enters the input of the counter 4. This changes the code at the output of the counter 4, and

0 multiplexer 5 connects the input of the comparator 9 to the next of the monitored channels. At the same time, the control unit 8 generates at the first output a new value of the reference voltage (Fig. 2a and b, maximum).

If multiplexer 5 connects the input of the comparator 9 to a channel in which alternating voltage operates with an amplitude greater than that formed by block 8

0 control is the reference voltage, at the output of the comparator 9 there are pulses that arrive at the input of the accumulator 6. Next, the operation process of the device is similar to that described (fig. 2a - w, t2-ta moments).

5 If the monitored channels are healthy, the output impulse of accumulator 6 restarts the one-shot 7 with restarting, since the accumulation time will be less than the analysis time (Fig. 2e, O-ta moments).

In case the comparator 9 is connected to a non-faultless channel, the time required for the accumulation of K pulses will be longer than the analysis time, which causes the one-shot 7 to work and restart and form the output pulse of the one-shot 3 (Fig. 2e, e, moment). This pulse resets the drive 6 to the initial state, writes the number of the faulty channel to the fault recorder 1, as well as through the OR element 2 arrives at the input of the counter 4. At the same time, the code at the output of the counter 4 changes, and the multiplexer 5 connects the input of the comparator 9 to the next from monitored channels.

Introduction to the circuit of the comparator device 9 with a variable response threshold makes it possible to more reliably estimate the amplitude of the signals in the monitored channels than in the known device. This is especially noticeable when the monitored signals in different channels have different logical levels (for example, TTL and CMOS). The amplitudes of monitored alternating voltages can also vary significantly across different channels, so a comparator with a variable response threshold is needed to more accurately estimate their levels.

In the known device, the analysis time Ta is selected from the channel parameters with the lowest pulse frequency. If a channel with a higher frequency turns out to be faulty, the specified value Ta will be redundant by the value of AT:

AT Ta Tai

OR

AT

TO

TO

Cumin fl

where f) is the nominal frequency of the pulses in the i-th channel,

Obviously, in the case of a faulty i-channel, the duration of the monitoring cycle is increased by the value of АТ. Since an increase in the duration of the monitoring cycle leads to a decrease in the monitoring efficiency and, consequently, the quality of monitoring, in the proposed device the analysis time for each channel is chosen to be close to optimal and varies commands from the control unit 8 when changing the number of the controlled channel.

Some of the monitored channels check for alternating voltage

which is converted by the comparator 9 into pulses with a follow-up frequency equal to the frequency of the controlled alternating voltage. Switching on between the output of multiplexer 5 and the input of comparator 9

nonlinear element 10, the volt-ampere characteristic of which is an even function, allows to increase the pulse frequency at the input of accumulator 6 and, thus, to reduce the accumulation time (and

also analysis).

Taking into account the complexity of the implementation of a nonlinear element with a power of more than two

or full-wave rectifiers. The nonlinear element has no effect on the passage of a pulse signal.

Thus, the proposed device allows to expand the functional

the capabilities of the device due to the possibility of controlling both pulsed and alternating voltages. In addition, due to the change in the reference voltage of the comparator when changing monitored channels, the accuracy of the control of the amplitude of the monitored signals increases, and the change in the analysis time reduces the duration of the control cycle when there are one or more faulty ones among the monitored channels.

Claims (1)

Apparatus of the Invention A device for monitoring multichannel pulse sequences of auth. St. N 1624674, characterized in that, in order to expand the functionality of the device, a control unit is inserted into it, and between the multiplexer output and the accumulator input there is a sequential chain of a nonlinear element and a signal comparator, the reference voltage input of which is connected to the first output of the control unit, connected to the second output with an additional the one-shot input with restart, and the control inputs with the corresponding pulse counter outputs. and but ii g AIM urn 11 Ш1Ш1111 j and and and Criminal Code tb D ia0lj ts t, 2 FIG. g Jlj tl tb ts