SU1531019A1 - Device for tolerance monitoring of pulse reetition rate - Google Patents

Abstract

The invention relates to a pulse technique and can be used to control the frequency of periodic pulse sequences. The device contains an OR 1 element, an AND 2 element and frequency sensors 3, 4, each of which consists of AND 5, 7 elements and a single vibrator 6. Changing the connections and parameters of the single vibrator 6 of the sensor 3 allows for simplifying the device by eliminating two additional single vibrators and at the same time perform frequency tolerance control with automatic entry into the control mode when the frequency leaves the tolerance range. 4 il.

Description

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The invention relates to a pulse technique and can be used to control the frequency of periodic pulse sequences.

The purpose of the invention is to simplify the apparatus of poficTBa,

FIG. 1 shows a block diagram of the device; in fig. 2–4 are timing diagrams explaining his work.

The device for the tolerance control of the pulse frequency contains an element OR 1, an element AND 2 and sensors 3 and 4 frequencies, each of which consists of a series-connected element AND 5 and a single-oscillator 6, as well as element And 7, Input 8 of the device is combined with the first inputs of elements AND 5 of sensors 3 and 4, the outputs of elements AND 7 of which are connected, respectively, through the element OR 1 to the second input of the element AND 5 of sensor 3 and directly to the second input of element AND 5 of sensor 4. Inverse outputs of single vibrators 6 sensors 3 and 4 combined with the first in element 7 and one of the inputs of the element 2, the output of which, being the device output 9, is connected to the second input of the element OR 1, the direct outputs of the one-vibrators 6 sensors 3 and 4 are connected, respectively, to the second input of the sensor element 7 4 and with the second input element 7 of the sensor 3.

The device works as follows.

At the initial moment of time, the inverse outputs of the one-vibrators 6 sensors 3 and 4 are in a high voltage level, and consequently, at the output of the AND 2 element. This signal, entering the input of the OR 1 element, causes the same the signal at its output, which permits the passage of the first pulse of the controlled frequency through the element 5 of the frequency sensor 3 to the input of the one-shot 6, causing the output of its pulse

The duration of the pulses generated by one-shot 6 sensors 3 and 4 are chosen, respectively, equal to

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 ui- 2T - i3L, - t

- WH J- k

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where TC is the period of the controlled frequency;

0

five

ULf, - upper, maximum permissible deviation of the period of the controlled frequency;

 lower, maximum tolerance of the controlled frequency period.

Thus, if at a selected pulse duration generated by the single vibrators 6 of the sensors 3 and 4, the controlled frequency will be within acceptable limits, then the pulses of the controlled frequency coming to the device input will alternately start the single vibrators of the six sensors 3 and 4 (Fig. 2).

If the value of the monitored frequency is above the permissible limit, then at time t the frequency controlled impulse arrives at the device input when both single vibrators 6 sensors 3 and 4 generate pulses and are forbidden by means of And 7 elements to pass them to the single vibrators 6 (Fig. 3) . After the formation of pulses by single vibrators 6 of sensors 3 and 4 at the output of element I 2 is completed, a high voltage level appears that signals the output of the monitored frequency is out of tolerance and permits the passage of the next monitored frequency pulse to the input of the single vibrator 6 of the sensor 3, resuming the monitoring mode.

If the value of the monitored frequency is below the permissible limit, then at time 1-5 a pulse of the monitored frequency will go to the device input when both single-oscillators 6 sensors 3 and 4 complete the formation of pulses and at the device output a high voltage signaling the controlled frequency is out of range, and will resume the monitoring mode (Fig. 4).

Thus, the device, with a simplified scheme, allows the tolerance control of the pulse frequency with automatic entry into the control mode when the frequency is turned on and out of tolerance.

Claims (1)

Claims. The device tolerance control pulse frequency, f, 1st element AND, element OR and two frequency sensor, each consisting of the first element And the one-shot and the second element And, the first input of which is connected to the inverse output of the one-vibration, the first inputs of the first elements of the first and second frequency sensors connected to the input of the device, and the output of the element And device output and through the elements OR connected to the second input of the first element AND the first frequency sensor, characterized in that. 10196 that, in order to simplify the device, the outputs of the second elements AND of the first and second frequency sensors are connected respectively to the second input of the OR element and the second input of the first element AND the second frequency sensor, the direct outputs of the single vibrators of the first and second frequency sensors are respectively connected to the second inputs of the second AND elements the second and first sensors, and the inverse outputs of one-shot are connected to the inputs of element I. ten f Fig.b