SU1415434A1 - Pulse shaper - Google Patents

Abstract

The IMTG forming device is intended for use in the automation of energy systems. The purpose of the invention is to increase reliability by preventing false returns of the device while decreasing the frequency. The device contains a shaper 4 short pulses, RS-flip-flop 3, a counter 2 pulses, the generator 5 pulses of a stable frequency. Introduction of frequency converter 7 - code, programmable frequency divider 6, elements 1 and element OR 8 provides control of the frequency divider ratio of the monitored signal, which prevents the device from returning to its original state when the shortest Vreg-w frequency is minimized. . 2 Il. (L

Description

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The invention is intended for use in the automation of energy systems,

The purpose of the invention is to increase reliability by preventing false returns of the device while decreasing the frequency

Fig, 1 shows a diagram of the device; Fig 2 - time diagrams of his work.

The device contains an AND 1, counter 2, RS trigger 3, shaper 4 short pulses, generator 5 stable frequency pulses, programmable frequency divider 6, frequency converter 7 - code, element OR 8

The shaper 4 short pulses are connected to the input bus and to the second input of the element 1, the output to the R input of the programmable frequency divider 6 and to the second input of the element OR, the generator of 5 stable frequency pulses is connected to the first input of the element 1 and C - input of programmable divider 6 frequency, the control inputs of the frequency converter 7 connected to the outputs of the encoders, and the output to the R input of the RS flip-flop 3 and to the first input of the OR element, the output of which is connected to the R input of the counter 2, C input connected to the ale output And 1, and the output to the S-input of the RS-flip-flop 3, the code of which is the output of the device.

The device works as follows

In the initial state, the AND element 1 is in the position of a logical zero. The C-input of the programmable frequency divider 6 receives pulses from the output of the generator 5 (Fig 2a) and with a certain period at the output of the divider 6 pulses appear (Fig 2h) AND, the outputs of the frequency converter 7 are the code (inputs A, o, , And "divider 6, the code value is proportional to the value of the frequency f of the monitored signal, information about which can be obtained, for example, at the input of a comparison circuit (not shown), from the output of which the pulses arrive at the input of the device. As a result, the division factor K. .. divider 6 turns out to be proportional to frequencies f. At the occurrence of pulses at the input of the device (Figure 2b) shaper 4 formi54342

short imK: -l; sy (Fig, 2b) are ruled, and at the output of the element I 1, bursts of pulses are formed (Fig 2g), and the length of the packs is equal to the duration of the pulses at the input The pulses from the former 4 are periodically zeroed out programmable depiq of bodies 6 and through the element OR 8 (fig. 2d) of counter 2, the division factor of counter 2 on output Q is set according to the condition of detuning from impulses of interference of short duration appearing on

5 device input “If there are enough packets at the C input of counter 2 (FIG. 2d), a logical unit signal appears on the output Q of the counter (FIG 2e). As a result, trigger 3 is activated (FIG. 2g). After the last pulse (Fig. 2b) disappears at the input, after a time t, the signal of the logical unit (Fig, 2h) appears at the output of divider 6,

5 wrapped leg through element OR 8 counter 2, and directly - trigger 3

five

0

(FIG. 2g) Recovery Time t

6

counted from the leading edge of the input pulses, is proportional to 0 their frequency equal to the frequency f of the signal at the input of the comparison circuit. It is defined as tg f where f, is the frequency of the generator 5o

The introduction of the control of the division factor K, the divider 6 in terms of the frequency of the monitored signal makes it possible to prevent the device from returning to its original state with decreasing frequency. Recovery time at

this remains a minimum of 0

Claims (1)

Invention Formula A pulse shaping device, g containing a shaper of short pulses, an input connected to the input bus, an RS-tfigger, an S-input connected to the output of the meter, and an output to the output bus, and a generator of stable frequency pulses, characterized in that, in order to increase reliability by preventing the device from returning falsely when the frequency is reduced, the transducer is inserted. frequency - code, programmable frequency divider, AND element, OR element, with a programmable frequency divider being connected to the R input of the RS flip-flop five and to the first input of the OR element, R- input - to the output of the short pulse pulse former and to the second input of the OR element, control inputs - to the outputs of the frequency converter - code, C input - to the generator output pulses of stable frequency k to the first input of the element I, the second input of which is connected to the input bus and the output to the C input of the counter, the R-BXO- connected to the output of the element OR, d P j I Jm