SU1437984A1 - Device for monitoring pulses - Google Patents

Abstract

The invention relates to the field of electrical measuring equipment and can be used to control the clock pulses of multichannel digital devices. The aim of the invention is to increase reliability and expand the field of application of the device. To do this, the unit 14 is additionally inserted into the device and the thyristor in the circuit of each input pins. The device contains input terminals 1, 2 and 3, differentiation ({4, 5 and 6, thyristors 7.8 and 9, resistors 10.11 and 12 to set the desired mode, element 13, button 15 , multivibrator 16, resistor 17, input device power bus 18. The display unit is made on transistor 20, capacitor 21, diode 22, mode resistors, LEDs 23. In contrast to the prototype, the proposed device can work with coincident signals and time-shifted signals, as well as signals received by EMX, to the input of the device at any pos epovatelnosti. Self-monitoring device is accomplished by pressing button 15, 1, s, n. 4 yl, l -o "

Description

The invention relates to electrical measuring technology and can be used to control the clock pulses of multichannel digital devices.

The aim of the invention is the reliability and expansion of the field of application of the device.

FIG. 1 shows the electrical Q circuit diagram of the device; ig, 2 - electric circuit of the multivibrator; in fig. 3 - time diagrams that clarify his work; on 4 - voltage plots, on the basis of the operation of the device.

. A device for controlling pulses, contains n "input pulses 1, 2, ... 3 devices, differentiating drivers 4 - 6, connected with-20 responsibly to inputs 1-3, thyristor mountains 7-9, the control inputs of which are connected to the first input terminals of the corresponding formers 4–6, the second output terminals of which are directly connected to the first closing contact of the self-control button, the thyristors 7–9 cathodes are connected to the common bus of the device through 10–12 resistors, and directly to the the corresponding inputs of the element And 13, A single output with the input of the display unit 14, the output of the display unit 14 through the second disconnecting contact of the button 15 is self-controlled connected to the common bus of the device, which also includes the self-oscillating multivibrator 16, the second mode power source is connected to the input 18 of the device power supply, connected through a mode resistor 19 with the power input of the element I 13, and directly with the power input of the display unit 14 and the connection point of the second input of the second mode g resistor, the second closing contact of the button itself warning light.

The anodes of the thyristors 7-9 are combined and are connected via a series-connected resistor 17 to the second closing contact of the self-control button 15, and directly to the output of the self-oscillating multivibrator 16. The display unit 14 is executed on the transistor 20, capacitor 21, diode 22 mode resistors, LED 23, connected in the conductive direction between the collector — connected through the second mode resistor of the ind35 block

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55

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Q 5

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katsii with vpsodom display units 14, and the emitter of the transistor 20.

The anode of the diode 22 is connected to the input of the display unit 14, and the cathode of the diode 22 is connected via a capacitor 21 to the output of the display unit 14, the junction point of the diode 22 and the capacitor 21 is connected to the base of the transistor 20 of the display unit 14 via a resistor.

FIG. 2 shows an electrical circuit of a multivibrator 16, made, for example, according to the circuit shown in FIG. 2. One of the outputs (inlet + TU) of the multivibrator 16 is connected via a capacitor 24 to the base of transistor 25. When a positive potential appears at this output of the multivibrator 16, the transistor 25 opens for the time it takes to charge the capacitor 24. Consequently, the resistance of the collector - its emitter will become close to zero. As soon as capacitor 24 is charged, transistor 23 closes and opens again when a positive signal is received at the same output of multivibrator 16. At all other points in time, the transistor 25 is closed, the resistance of the emitter junction - its collector is large and does not interfere with the operation of the device.

FIG. 3 shows timing diagrams explaining the operation of the multivibrator 16.

The timing diagram (FIG. 3) shows the voltages U, on the collector of the transistor 26 of the self-oscillating multivibrator 16 connected through a capacitor 24 to the base of the transistor 25.

The timing diagram (FIG. 3) shows the voltage Ug supplied to the base of transistor 25 through a capacitor 24,

The time diagram (Fig. 3) shows the voltage U on the collector of the transistor 25 at the moments of its closed and open state.

The device works as follows.

After applying voltage to the device, it is ready for operation, i.e. to receive input controlled pulses.

when the first input pulse arrives at terminal 1 of the differential driver 4, the thyristor 7 is turned on and off

In the case of the arrival of the second pulse, the thyristor 8 is turned on to terminal 2 and the positive signal from the operating resistor 11 is fed to the second input of the n-input circuit I 13.

When a pulse arrives at terminal 3, the thyristor 9 turns on and a positive signal from the mode resistor 12 goes to the third input n-in. AND 13 circuit. Thus, all the inputs of the AND 13 circuit receive positive signals.

All transistors of the circuit AND 13 are turned on. At the same time, through a small mode resistor connected to the input terminal 18, and element 13 is quickly charged to the capacitor 21, which is included in the block 14 and the indication. The transistor 20 of the display unit 14 opens, while the LED 23 of the display unit 14 is not illuminated. After a certain time, the self-oscillating multivibrator 16 (it operates in the self-oscillating mode) is triggered, the transistor 25 of the multiviral driver 16 is briefly opened, and thus the connected thyristor anodes 7–9 are connected to the common bus of the device and

To ensure reliable operation of the device, the following conditions must be met (Fig. 4).

When entering inputs 1-3

35

clock pulses shifted in time (and ,, U, j, Uj are the voltages, respectively, at inputs 1, 2, ... 3)

thus extinguishes - out these thyristors. Thyristors 7 - 9 are not turned off and are ready to work again, and the positive signals at the input of the circuit And 13 disappear and its transistors are closed. H (e transistor 20, included in the display unit 14, is still open, and the LED 23 does not light. It reaches -4o that period 1 is required by auto- because the constant oscillation of the multivibrator 16 is bolsar and capacitor 21 is selected: above the total time taken

: very small (it is practically controlled by pulses. In the case it depends on the nominal value of the operating resist-three input pulses, this condition

19, connected to terminal 18, ycT-j 45 looks as follows, and the resistor rating is the one we need). Let us assume that the charge time of the capacitor 21 is equal to p 0.7 Ере, С, where Rpe is the co-npoigiBneHHe resistor 19, and С is the capacitance of the capacitor 21.

The capacitor 21 will be discharged through a modular resistor connected to the base of transistor 20, and the base-emitter junction of the same transistor.gg

In this case, the transistor 20 is maintained in an open state, and therefore, the LED 23 is amplified and does not light up. Capacitor discharge current 21

Where

T 7 0, + Vl + Jj,

- self-oscillation period

multivibrator 16; , shift between input pulses taking into account the duration of the pulses themselves.

The discharge time of the capacitor 21 of the display unit 14 should be slightly longer than or equal to the self-oscillation period of the multivibrator 16, i.e.

7 T

 -paj -

is small enough, its value is defined as 1 base value of the base current (in order to keep the transistor 20 of the display unit 14 in the open state),

In the proposed device, the constant discharge time is chosen to be significantly greater than the constant charge,, -, so the capacitor 21 is not completely discharged. When pulses re-enter the device, the condenser 21 of the unit 14 and the indication is additionally recharged.

This continues for as long as 5 monitored pulses arrive at the inputs t-3, i.e. the transistor 20 of the display unit t all the time bypasses the LED 20, and as a result it does not light up during normal operation of the device.

Suppose that an input pulse has stopped flowing to one of the inputs.

Then one of the thyristors 7-9 will not turn on, the AND 13 circuit will not work.

Capacitor 21 will stop charging and will soon be fully discharged. The transistor 20 is closed, the LED 23 is lit, and this indicates a failure in the normal operation of the device due to the disappearance of pulses on one of the inputs 1-3 of the device.

To ensure reliable operation of the device, the following conditions must be met (Fig. 4).

When entering inputs 1-3

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About it is necessary that the period of 1 auto-oscillations of the multivibrator 16 should be most time-shifted clock pulses (and, U, j, Uj - voltage, respectively, at inputs 1, 2, ... 3)

It is necessary that the period 1 of the auto-oscillations of the multivibrator 16 be more pronounced as follows,

Where

T 7 0, + Vl + Jj,

- self-oscillation period

multivibrator 16; , shift between input pulses taking into account the duration of the pulses themselves.

The discharge time of the capacitor 21 of the display unit 14 should be slightly longer than or equal to the self-oscillation period of the multivibrator 16, i.e.

7 T

 -paj - where Cpoi is the capacitor discharge time 21 „

Interpretation of the decree conditions, which determine the normal functioning of the control device,; does not require a game; any special; -adg - l, and is solved by selecting para-fert-OB with the corresponding elements of the device, the TSHE by solving - E stp questions,

In addition to the prototype, which can only control the coincidence of the signals in time, the proposed device works with coinciding signals and at the same time shifted and posturals at the input of the device in any order.

In addition to Toros, the device is characterized by the ability of self-control, which is carried out by a simple pressing of the self-control button 15 by the operator, In this case, the device operates as follows,

When the button 15 is pressed, the contact is opened through which the capacitor 21 of the display unit 14 in the control reattme is permanently connected to the common capacitor 21 of the display unit 14 is disconnected from the common bus of the device

In addition, the second contact opens the button 15 self-control resistors differential shapers

4-6 are disconnected from the common nitTa-bus.

do not connect to the -s-ey bus, power (terminal 18)

In this case, all thyristors are turned on, t-: a inputs from: and: e. We and f3 receive signals, it turns on and turns on the tractor 20 of the display unit 14, the capacitor 21 of the unit 14 in this section

interferes - it is disabled, since auto

Multifunctional vibrating 16 operates “then it turns off on, short

(.

1 time all thyristors

The circuit 13 is closed, and since the capacitor 21 is turned off, the transistor 20 of the display unit 14 is immediately closed. The LED 23 of the block 14 is illuminated. As the self-control button 15 is pressed, the circuit 13 turns on again, and the transistor 20 opens. L of the display unit, and the LED 23 goes out, - TSSL 3 mode is self-monitored, when the device is in good condition, periodical operation of the LED 23 of the display unit 14 is observed, which informs about a repair

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about

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g g of the proposed control device. Since, in the self-checking mode, almost all the elements are involved; device, except for capacitors, the periodic glow of the LED indicates the health of the entire circuit. After releasing the self-test button 15, the device is again ready to work in re; ettme control of input pulses.

Formula, and 3 Br.

Claims (1)

1, a device for controlling an inlet-coBj containing a pulse generator, formers, a n-input element, and an input parameter mHHs characterized in that, in order to increase reliability and extend the field of application, an indication unit and a thyristor on each of n are inserted into it - input busbars, whereby the driver is designed as a differential driver, the generator - as a self-oscillating multivibrator, each of the thyristors connected by a control input to the first output terminal of the corresponding differential driver, The second output terminals of the pulse formers are combined and directly connected to the first output of the closing contact of the self-control button, and through the first disconnecting contact of the self-control button to the common bus connected via the second disconnecting contact of the self-monitoring button and through the corresponding first ь regime mode resistor - with the cathode of the corresponding thyristor and the corresponding input of the n-input element I; the anodes of all thyristors are connected and directly connected to the output of a self-oscillating multivibrator, and through a serially connected second mode resistor to the power source, the output of the n-input element I is connected to the input of the display unit, the power input of the display unit is connected to. a power source connected to the power input of the p-input element I and the connection point of the second output of the second mode resistor with the second output of the shorting contact button self-control, 2, The device pop, IjOTHH- is that the power supply unit is made on the transistor switch, LED, capacitor and diode. the anode of which is the input of the display unit, and the cathode through a capacitor is connected to the output of the display unit, and directly to the base of the transistor switch, whose collector connected to the anode of the LED, is connected to the power input of the ividation unit, And the emitter of the transistor switch connected to the cathode LED, connected to the common bus device. Kresisto-O rune R  L FIG. 2 fig.Z F1 / e.