SU1157669A2 - Device for generating pulses with controlled duration - Google Patents

Abstract

DEVICE FOR THE FORMATION OF PULSES OF REGULATED DURATION by author. St. 725213, characterized in that, in order to expand the functionality of the device, a group of keys, delay lines, 3ii-trigger, are introduced into it. a ring shift register and a group of logical elements, And, with the inputs of a group of keys connected to individual sections of the measuring winding, and the outputs to the input of the comparator unit, one of the outputs of which is connected to the K input OK. trigger with input of delay line and with control input of ring shift register, recording entry of which is connected to S input of ZK flip-flop and input bus, output of delay line connected to O-input of ZK flip-flop, output of which is connected to first group inputs logical elements And, to the second inputs of which are connected the outputs of the ring register s shift, and the outputs of the group of logical inputs And are connected to the control inputs of the group of keys.

Description

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The invention relates to a pulse technique and can be used in time-pulse conversion and digital filtering devices. The aim of the invention is to expand the functionality of the device by forming a sequence of pulses of adjustable duration for each step of operation. On. The drawing shows a diagram of the proposed device. A device for generating pulses of adjustable duration contains a measuring winding 1 consisting of concentrated sections having independent leads located on a magnetic core 2 loaded on a matching magnetic resistor 3, a controlled current source 4, a winding 5 of the excitation, a simultaneous 6, the output of which is connected to the control input of the current source 4, the output of which is connected to the input of the unit 8 comparing a group of keys, a delay line, DC - trigger 9, a shift register closed in a ring and a group of logical elements The inputs of the key group 7 are connected to separate sections of the measuring winding, and the outputs are connected to the inputs of the comparator unit 8, one of the outputs of which is connected to the input K of the LC-flip-flop 9, with the input of the delay line 10 and with the control input the recording of which is connected to the S input C) (- trigger and input terminal, the output of the delay line 10 is connected to the input J of the SQ - trigger 9, the output of which is connected to the first inputs of a group of logic elements 12 And, to the second inputs of which the outputs of the register 11 are connected shift, and the outputs of a group of logical elements Commodity 12 I is connected to the control inputs of a group of keys 7. The device operates as follows. After turning on the power supply and okoH transient processes, the single vibrator 6 is in steady state, the controlled current source 4 is turned on. By applying a short pulse to the input terminal. Preparation Trigger 9 is set to one, and a unit is recorded in the P bit of the shift register 11. The signal from the output of the logic element AND corresponding to the nth mu of register 11 opens the corresponding key from the group of keys 7, thus connecting the section of measuring winding 1 furthest from the excitation winding to block 8 of the comparison. A start pulse applied to the Start terminal triggers a one-shot 6, which generates a negative-polarity pulse of a certain duration, which is fed to the control input and current source 4 and turns it off, thereby breaking the excitation circuit. At the end of this pulse from the output of the one-shot 6, the pole-type voltage drop switches on the current source and with the help of the excitation winding 5 connected to it in a magnetic line a pulse of magnetic flux is excited, the amplitude of which decreases exponentially along the length of the magnetic line. Through the measuring windings 1, the pulse flow is converted into a voltage exponentially varying in time supplied through the public key of the key group 7 at the input of the comparison unit 8, where it is compared with the threshold level. The time it takes for the exponential voltage to reach the threshold level determines the duration of the pulse at the output of the comparison unit 8 and depends linearly on the coordinate of the measuring winding section 1. The duration of the pulse generated by the comparator unit depends linearly on the coordinate of the measuring winding connected to it, which makes it possible to set this duration very precisely, the winding in the appropriate way along the length of the magnetic line. After the end of the pulse at the direct output of the comparator unit 8, a signal appears at its inverse output, which brings the OK-trigger to the zero state, and also shifts the unit recorded in register 11 by one bit to the left, i.e. c (n - 1) bit. Through time T cosnt, determined by the delay line 10, the signal from the inverted output of the comparison unit 8 arrives at the L input of the trigger 9, enables the passage of a high potential from register bit 11, where there is a unit, on managing

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the input of the corresponding key from the key group 7, which leads to the connection of the corresponding section of the measuring winding 1 to the input of the comparison unit 8. As a consequence, a pulse appears at the forward output of the comparison unit 8, the duration of which is determined by the difference between the time during which the exponential voltage on the measuring winding section in question reaches the threshold level and the sum of the time (T and the time from the moment of excitation of the magnetic line to After the pulse at the direct output of the comparator unit 8, a signal appears at its inverse output, which again brings the trigger 9 into the zero state, shifts the unit, recorded in register 11 one bit to the left. After time P const, determined by the delay line 10, the signal from the inverse output of the comparison unit 8 goes to the J input of the trigger 9 and puts it into one state. The signal from the output of the trigger 9 permits the passage high potential from the register bit 11, where the unit is located, to the control input of the corresponding key from the key group 7, which leads to the connection of the corresponding section of the measuring winding 1 to the input of the comparison unit 8. As a consequence, at the direct output of the B block, a pulse appears; its duration is determined by the difference between the time during which the exponential voltage on the considered section of the measuring winding 1 reaches the threshold level and the sum of the time Z and the time from the moment of excitation of the magnetic line until the end the previous pulse from the direct output of the comparison block 8, etc.

The described process is repeated until the unit recorded in register 11 is in the first (most senior) bit of register 11. After the end of the pulse on the right

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At the output of the comparator unit 8, a signal appears at its inverse output, which translates the JK-trigger 9 into the zero state, and also shifts 5 units, recorded in register 11, one bit to the left. In this case, the unit recorded in the higher bit of the register 11 goes to the lower bit. After a time T const determined by the delay line 10, the signal from the inverse output of the comparison unit 8 goes to the D input of the trigger 9 and puts it into the unit state the Thus, the device goes into the initial state: the one-shot 6 is in a steady state, in the n-th bit of the register 11 a unit is written. In this state, the device is up to

0 as long as the next starting impulse is not given. When a starting pulse is applied, the whole process is repeated.

Thus, in one cycle of excitation of a magnetic line, at the direct output of the comparator unit, a sequence of pulses is formed, following each other with a time interval equal to const. The duration of the pulses in a bundle is determined by the position (coordinates) of the corresponding sections of the measuring winding and can be set arbitrarily in the range from tenths to hundreds of microseconds. For example, the pulse durations in a burst can be selected in proportion to the weights of the binary bits when using the present invention in digital control devices for optimal filtering.

Compared with the known devices for the formation of a sequence of pulses (on delay lines, multivibrators, magnetotransistor amplifiers, etc.), the present invention allows to expand the range of pulse durations by a factor of ten.

when they are independent of the stability of the supply voltage.

Claims (1)

DEVICE FOR FORMING PULSES OF REGULATED DURATION by ed. St. No. 725213, characterized in that, in order to expand the functionality of the device, a key group, a delay line, a BC trigger, an annular shift register and a group of logical elements AND are introduced into it, and the inputs of the key group are connected to separate sections of the measuring winding, and the outputs - to the input of the comparison unit, one of the outputs of which is connected to the K-input of the BC-trigger, with the input of the delay line and with the control input of the annular shift register, the recording input of which is connected to the S-input of the ZK-trigger and the input bus, the output of the delay line connected to the □ -input of the PC trigger, the output of which is connected to the first inputs of the group of logical elements AND, to the second inputs of which _ the outputs of the circular register 3 of shift are connected, and the outputs of the group of logical elements AND are connected to the control inputs of the key group. . 1157669 I 1157669 2