RU1824671C - Pulse delay unit - Google Patents

Abstract

Usage: field of automation and computer engineering, for delaying pulses in devices for various purposes. The device allows increasing the upper delay limit, eliminating the dependence of the delay duration on the duration of the input pulse, and preserving the shape and duration of the delayed rectangular input pulse. The input of the device is locked for the time between the drops of the input and delayed pulses, which eliminates device malfunctions when interference pulses arrive at the input in the indicated time interval. SUBSTANCE: in order to solve this problem, a pulse delay device containing an input pulse source, a first short pulse shaper, a single vibrator and an And element, additionally three short pulse shapers, an inverter, a second one-shot and two RS flip-flops are added. Z ill. Yo

Description

The invention relates to the field of automation and computer engineering and can be used to delay pulses in devices for various purposes.

The aim of the invention is to expand the functionality and increase the noise immunity of the device, namely, providing independently the delay value from the duration of the delayed rectangular pulse while maintaining its shape and duration and locking the input for a time between the trailing edges of the input and delayed pulses in order to avoid disruption of the device due to interference at the indicated time.

Figure 1 shows a functional diagram of the proposed device: figure 2 is a sequence diagram of its operation; Fig. 3 is an example

the implementation of the simplest shaper (second) short pulses.

The pulse delay device (Fig. 1) contains a source of input (delayed) pulses (generator) 1, the output of which is connected to the first input of the I2 element, the output of the I2 element through the serial connection of the first short pulse former 3, the first one-shot 4 and the third short pulse former 5 connected to the S-input of the first RS-trigger 6, the output of the I2 element in parallel, through a serial connection of the second driver of short pulses 7. inverter 8, the second one-shot 9 and the fourth driver tkih pulses 10 is connected to the R-input of the first RS-flip-flop 6. The direct output of which is the output device and, in addition, connected to

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the dynamic inverse S-input of the second RS-flip-flop 11. whose dynamic inverse R-RHOD is connected to the first input of the I2 element, and the direct output of which the RS-trigger is connected to the second input of the I2 element.

The device operates as follows.

In the initial state (before applying pulses from the generator 1), the I2 element is unlocked for the signal from the generator, since the trigger 11 is installed in the state D using the installation circuit of the device in the initial state (not shown in Fig. 1). At the output of the driver 3 short pulses from the rising edges of the pulses of the generator 1 - logical O, at the output of the driver 7 - G, at the output of the element I2 - O, at the outputs of both single vibrators 4 and 9 - 1, at the outputs of the third and fourth drivers 5 and 10 - O, that is, both inputs of the RS-flip-flop b - O (to determine the position m, which is employed for as a trigger element 6 are prohibited R 1. S 1, otherwise on the R- and S-inputs can be fed offset or inverters or choose to apply to the inverting input trigger et al.). In this case, the trigger 6 using the installation circuit in the initial state is set to O.

When you turn off the initial setup circuit, the pulse from the output of the generator 1 (Fig.2-1) passes through the I2 element (Fig.2-2) and its rise front - through the former 3 (through the former 7 the rise front does not pass), resulting in the output of element 3 forms a short pulse (see Figs. 2–3), triggering the single-vibrator 4. The single-vibrator 4 generates a pulse (Figs. 2–4) with a duration equal to the specified delay time g. Since an inverted pulse is used as the output pulse 4, a negative polarity pulse (for example, if a differentiating chain is used as the shaper 5) can be generated from its leading edge (before inverting the decay) using the third short pulse former 5 (for example, case can be cut off by a diode, as a result of which the state of the trigger 6 does not change. At the moment of the end of the pulse of the single vibrator 4 (Figs. 2-4), the driver 5 generates a pulse of positive polarity (Figs. 2-6). switching trigger 6th state Г (see Fig. 2-9).

Similarly, the driver 7 will generate a short pulse from the decay front of the output pulse of the generator 1.

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The polarity of this short pulse.) Tioc ir. the inversion by element 8 becomes positive (Figs. 2-5), and this pulse starts a single-shot 9. At the inverse output of which a pulse is generated (Figs. 2-7) with a duration also equal to the delay time G3. From the trailing edge (rise) of this pulse with the help of the fourth driver 10, a short pulse of positive polarity is generated, which is supplied to the R-input of the RS-flip-flop 6 and returns to its original state. Thus, at the output of the RS flip-flop 6, a pulse is generated with a duration equal to the duration of the input pulse, delayed relative to the input pulse by time t3, independent of the duration of the input pulse. In addition, at the time of the slice front of the input pulse (that is, at the end of the input pulse) to the dynamic R-input of the RS flip-flop 11, this flip-flop switches to the O state, closing the I2 element for the passage of interference pulses (or subsequent useful signal pulses) up to the moment the delayed pulse ends, when the cutoff front of the delayed pulse is formed at the output of trigger 6, which is applied to the dynamic input of trigger 11 and returns to its original state. As a result of this, the I2 element opens again and passes another pulse from the output of the generator 1. and so on.

Shapers of short pulses 3, 5, 7 and 10 can be made according to known schemes with dynamic inputs, in the simplest case - in the form of differentiating RC chains (see, for example, FIG. 3).

Single vibrators 4, 9 can also be made according to known schemes, for example, those given in the Handbook of Microelectronic Pulse Technology. Under the editorship of Yakovlev V.N., K., 1983, p. 162-165 and others.

Compared with the prototype, the proposed device has the advantage that the maximum delay time gee does not depend on the duration of the delayed pulse gi (that is, it can be gi gi, and not just gi gi, as in the prototype).

Compared with other analogs, the proposed device identifies (within certain limits) single-shots and retains the shape and duration of delayed rectangular pulses and, in addition, has increased noise immunity, since in the period between the end of the input pulse and the end

the delayed pulse it is not susceptible to input signals, including interference or pulses with pauses shorter than the delay time - these signals do not pass to the inputs of the shapers and cannot interfere (as in the prototype and analogues) with the operation of the device.

Claims (1)

SUMMARY OF THE INVENTION A pulse delay device comprising a source of input delayed pulses, a first short pulse shaper, a first one-shot oscillator and an AND element, characterized in that that, in order to expand the functionality and increase noise immunity, it additionally introduces the second, third and fourth short-pulse shapers, an inverter, a second one-shot and the first and second RS-triggers, the input of the generator of input delayed pulses, for example, positive polarity, element I is connected to the first input, the element I is connected through the last connected first driver of short pulses from the rising edges of the input signal, the first one-shot and third driver short pulses connected to the S-input of the first RS-trigger. the output of the And element is connected in parallel through a second shaper of short pulses from the falling edges of the input signal, an inverter, a second one-shot and a fourth shaper of short pulses to the R-input of the first H $ - trigger, the direct output of which is the output of the device and, in addition, is connected to the inverse dynamic S-input of the second RS-trigger, the inverse dynamic R-input of which is connected to the first input of the And element, the direct output of the second RS-trigger is connected to the second input of the I. FIG. r s TsN-N I, 77 I, FIG. 2  No. J Fig.Z