SU1465976A1 - Device for shaping pulses of differential frequency - Google Patents

Abstract

The invention relates to automation and computing and can be used to target a small difference in the frequencies of two pulse sequences, for example, in control circuits of redundant highly stable pulse generators. The aim of the invention is to simplify the device. The device contains two triggers 1, 2, two izlementa OZ, 4, two inverters 5, 6, two delay elements 7, 8, two input buses 9, 10, two selectors 11.12, two output buses 13, 14. New is the introduction of two delay elements and new functional relationships. This allows comparing the frequencies of two identical highly stable, for example, quartz, pulse generators, whose frequencies differ only by the value of the specified tolerance, so that the device can be used in highly reliable redundant highly stable pulse generators. 2 Il. S (l

Description

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The invention relates to automation and computing thesis and can be used to highlight the difference in frequency, including small, two pulse sequences, for example, in schemes to control the operation of redundant highly stable pulse generators.

The purpose of the invention is to increase reliability by simplifying the device, achieved by reducing the number of incoming elements, while retaining all its functionality, ts

FIG. 1, an iboram of the structure of the proposed device; in fig. 2 - diagram of the operation of the device, where a - the first input bus b - the second input vyuna v - the output of the first delay element;

g - the output of the first inverter; g - the output of the first trigger§ e - the first output terminal | 25 the output of the second delay element j

j and - the output of the second inverter; k - the output of the second trigger;

l second output bus, 30 The device contains the first 1 and second 2 triggers, the first 3 and the second 4 And elements, the first 5 and second 6 NOT elements, the first 7 and second 8 are eleventh 11 and the second 12 selectors are for the first 13 and second 14 output tires, respectively.

The delay value of delay elements 7 and 8 is chosen from the condition of possible input frequency deviation, but not less than the total response time of one trigger and one AND element. You can use a delay line, such as a bullpen or LZE, as a delay element. The selectors 11 and 12 contain the delay elements and the element And, one input of which is connected to the input of the selector directly, and the other through the element of delay. The output of the AND element is the output of the selector.

The state of the triggers, in which the direct output is the resolving (high) potential, is taken as a single 1, and the state in which in the inverse output is the resolving potential20

al for zero - O. When signals arrive at the S- and R-inputs at two outputs, a single potential is set regardless of the signal at the C-input. In the absence of signals at the S- and R-inputs and when a positive differential is applied to C The trigger input is set to one. Such a requirement is met, for example, by the IR .564TV1,

Input signals are assumed to be

cops delays, first 9 and second 10 j duration. Otherwise, for input buses, the first 11 and second 12 input signals are equal to the minute selector pulse selectors of the first 13 and second 14 ejection, drive tires.

The first input bus 9 is connected to the 40 input of the first delay element 7, and to the R input of the second trigger 2, the Second input bus 10 is connected to the input of the second delay element 8 and to the R input of the first trigger 1 Output j of the first 1 and second 2 flip-flops connected to the first inputs of the first 3 and second 4 elements AND, respectively. The output of the first delay element 7 is connected to the second input of the first element I 3 and through the first element NOT 5 to the C-wired one of the first trigger 1. The output of the second delay element 8 is connected to the second input of the second element 4 and through the second element NOT 6 - to the C input of the second trigger 2o The outputs of the first 3 and second 4 elements And are connected to the W inputs of the first 1 and second 2 triggers through

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duration, you must use the formulas ateli.

The device works as follows.

In the initial state, the triggers 1 and 2 are set to the initial zero state (the reset circuits are not shown in the drawing; when using the IC 564TV1, which has only one installation input, the reset signal can be sent to the R input via the OR element).

The first pulse arriving at the input of the device, for example, the first input bus 9 (Fig. 2a), confirms the zero state of the second trigger 2, is delayed at the first delay element 7 (Fig. 2B) and is fed to the second input of the first And 3 element. Since the first trigger 1 is in the zero state (Fig. 2e), then at its direct output there is a low potential, i.e. first element and 3 zac

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the first 11 and second 12 selectors to the first 13 and second 14 output tires, respectively.

The delay value of delay elements 7 and 8 is chosen from the condition of possible input frequency deviation, but not less than the total response time of one trigger and one AND element. You can use a delay line, such as a bullpen or LZE, as a delay element. The selectors 11 and 12 contain the delay elements and, the element And, one input of which is connected to the input of the selector directly, and the other through the element of delay. The output of the AND element is the output of the selector.

The state of the triggers, in which the direct output is the resolving (high) potential, is taken as a single one, and the state in which in the inverse output is the resolving potential20

al for zero - O. When signals arrive at the S- and R-inputs at two outputs, a single potential is established regardless of the signal at the C-input. In the absence of signals at the S- and R-inputs and when a positive differential is applied to C- The trigger input is set to one. Such a requirement is met, for example, by the IR .564TV1,

Input signals are assumed to be

duration. Otherwise, to generate input signals equal to

duration, you must use the formulas ateli.

The device works as follows.

In the initial state, the triggers 1 and 2 are set to the initial zero state (the reset circuits are not shown, when using the IC 564TV1, which has only one bar, the set input, the reset signal can be fed to the R input via the OR element).

The first pulse arriving at the device input, for example, the first input bus 9 (Fig. 2a), confirms the zero state of the second trigger 2, is delayed at the first delay element 7 (Fig. 2B) and is fed to the second input of the first And 3 element. Since the first trigger 1 is in the zero state (Fig. 2e), then at its direct output there is a low potential, i.e. first element and 3 zac

dig at the first entrance. At the output of the device, there is no signal (FIG. 2E). On the trailing edge of the input pulse (Fig. 2a), delayed at the first delay element 7 and NOT the first element inverted by the first element, the first trigger 1 (Fig. 2e) is set to the one state. If a pulse does not arrive at the second input bus 10, and the following pulse arrives at the first input bus 9, it will be delayed at the first holder element 7 and then pass through the first element 3 to the first output of the device. If, after a pulse arrives at the first input bus 9 (Fig. 2a), the pulse arrives at the second input bus 10 (Fig. 26), then the first trigger

1 is set to zero. (fig.2d), and the second trigger 2 - in the unit (Fig. 2k). The passage of a pulse is similar to that described for a pulse on the first input bus 9 (Fig. 2g,

I9K, l).

Thus, when alternating pulses are received, the pulses do not pass to the output of the device.

Consider the case when of the two pulse sequences that are close in frequency, the frequency of the second sequence is slightly higher than the frequency of the first sequence. From FIG. 2 it can be seen that while the input pulses do not coincide in time, the operation of the device is similar to that considered above.

. With further mutual movement, the moment of partial coincidence of the input pulses comes (Figs. 2a, 5). In this case, the first trigger 1 is not set to one on the trailing edge of the input pulse on the first input bus 9 (Fig. 2e, and ), since at its R-input there is already a pulse from the second input bus 10 (FIG. 26). On the falling edge of this pulse, delayed on the second delay element 8, is the second trigger.

2 is set to one (FIG. 25, g, i, k). The next pulse on the first input bus 9 will set the second trigger 2 to the zero state (FIG. 2a, k). Thus, with partial coincidence of the pulses, resulting from their mutual movement, the pulses do not pass to the output of the device.

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Consider the case of complete coincidence of the pulses in the first

9 and second 10 input tires (FIG. 2a, b). Of the above operation of the device

and the diagrams of its operation (Fig. 2a, b, c, d, d, g, and, k) are visible, then at the end of the input pulses, the first 1 and second 2 triggers are set to one (Fig. 2e, k). At the output of the device, there are no pulses (Fig. 2e, l).

With further reciprocal movement, one of the input pulses will go to the input of the device first. For example, the first one entered the uspulse on the second input bus 10. In this case, two cases are possible. The first case when the difference in the moments of arrival of pulses at the input is less than the difference due to the deviation, the second case is more than the difference due to the deviation.

Consider the first case. A pulse arrived at the second input bus 10 (Fig. 2b). With its front edge, he set the first trigger 1 (fig.2d) to the zero state, and, besides this, he entered the input of the second 8 delay element. Since the delay time is chosen to be equal to the shift time due to deviation, and in this case it is longer than before the pulse arrives at the C input of the second trigger .2, its R input enters the pulse from the first input bus 9 (FIG. 2b) and sets the second trigger 2 to the zero state (Fig. 2k). On the falling edges of the input pulses, the triggers 1 and 2 are set to one.

Thus, when one input pulse is advanced by another for a time less than the difference due to deviation, no pulse is generated at the outputs of the device.

Consider the second case. Impulse arriving at the second input bus

10 (FIG. 26), with its leading edge sets the first trigger 1 (FIG. 2e) to the zero state and enters the input of the second delay element 8. From the output of the second delay element 8 (Fig. 2i), the pulse will go to the C input of the second trigger 2 and to the second input of the second element I 4. Since the pulse to the second input w;

; the pulse on the first input bus 9 of the device for a time longer than the delay time, by the time the pulse arrives at the second input of the second element AND 4 the second trigger 2 is in the one state, and a pulse is formed at the output of the second element 4) (FIG. Well, k, l). The impulse from the output of the second element 4 goes through the second selector 12 to the second output edge 14 and to the S input of the second trigger 2, gydtverlode, with a high potential at its single output spur not the second output bus 14 ends at the end of the pulse at the output of the second element 8 delays. After that, the mt pulse is removed from the S-input of the second trigger 2, but the pulse will continue to act on the E-input of the trigger 2, as a result of which the trigger 2 is set to the zero state (FIG. 2k).

In this way, an impulse is formed on the device’s impulse only if the impulse of one sequence advances the impulse of another sequence by a time longer than the allowable deviation

The first 11 and second 12 selectors of the minimum pulse duration are designed to reduce the possibility of interference from the device output. Duration: & interference does not exceed the triggered triggered time of the trigger and the element And, based on this, the requirements for the selector imount & Formation is possible if, after the arrival of the C-input of the trigger and before the arrival of the impulse, the impulse arrives at the S-input at the E-input of the transducer. Time from imils, arriving at the C-entrance to

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impulse to S-input, is determined by the total response time of the trigger and the element And ..

Thus, the proposed device performs the same functions as the prototype device but contains much less elements. it is easier.

Claims (1)

Invention Formula A device for generating differential frequency pulses containing nerves and second triggers, the outputs of which are connected respectively to nepBiiB, enters the first and second elements AND, nepB & di, and the second selectors of minimum duration, which in order to increase reliability by reducing device, you will enter into it the second and second elements NOT and the first and second delay elements, and the input of the first delay element to the first input bus and to the E input of the second trigger, and the output to the input of the first element AND the first element is NOT to the C input of the first trigger; the input of the second delay element is connected to the second input and the R input of the first trigger; the code is connected to the second input of the second element I; and through the second element BE to the second input of the second trigger, outputs The first and second elements of And are connected respectively to In-Ids of the first and second triggers and through the first and second selectors of the minimum duration - respectively to the first and second output buses of the device. FIG. 2