SU1597860A2 - Device for determining middle of pulses of recurring monotonous time sequence - Google Patents

Abstract

The invention relates to a pulse technique and can be used in measuring the phase shift of harmonic signals. The purpose of the invention — extending the functionality — is achieved by determining the midpoint of the pulses of a periodic monotonic pulse sequence in real time. A device for determining the midpoint of pulses of a periodic monotone pulse sequence contains an input bus 1, a trigger 2, two elements OR 3.4, reversible counters 5.6, four elements AND 8.9, 10.11, a generator 16 pulse counter, a delay element 17, Comparison unit 18, first output 19 of the device. A second trigger 7, elements 12, 13, 14, 15, two reversible counters 20, 21, two decoders 22, 23 zero, two drivers 24, 25 pulses, a third element OR 26, a second output 27 of the device are entered into the device. By introducing new blocks and new connections, the aim of the invention is achieved. 1 il.

Description

The invention relates to a pulse technique and can be used in measuring the phase shift of harmonic signals, in particular in displacement transducers (angle) phase - code, and is an improvement of the device according to ed. St. N 1282072.

The aim of the invention is to expand the functionality by determining the midpoint of the pulses of a periodic monotone pulse sequence in real time.

The drawing shows a functional diagram of the device for determining the midpoint of pulses of a periodic monotonic pulse sequence.

A device for determining the midpoint of pulses of a periodic monotonous pulse sequence contains an input bus 1 connected to the counting input of trigger 2, to the first inputs of the first and second elements OR 3 and 4, the outputs of which are connected to the reset inputs of counters 5 and 6, to the first input of the additional trigger 7 , with the first inputs of the first 8, second 9, third 10, fourth 11 zlemeitov I. The first output of trigger 2 is connected to the second inputs of the first element OR 3, first 8, fourth 11, fifth 12, eighth 13 elements And, second output The counting trigger is connected to the second inputs of the second element OR 4, the second 9, the third 10, the sixth 14, the seventh 15 And, the output of the reference generator 16 is connected to the delay element 17, the first inputs of the fifth 12, the sixth 14, the seventh 15, the eighth 13 And elements, the third inputs of the first 8, third 10 elements And, the outputs of the first 8 and third 10 elements And connected to the inputs + reversible counters 5 and 6, respectively, and the outputs of the second 9 and fourth 11 elements And connected to the inputs - reversible counters 5, 6 whose outputs go to the inputs comparison circuits 18, the output of which is the first output 19 of the device and simultaneously arrive at the second input of an additional trigger 7, the output of which is connected to the third inputs of the fifth and seventh 15 elements AND, the outputs of the 12 and seventh 15 elements AND to the inputs + reversible counters 20 and 21, the inputs of which are connected to the outputs of the sixth 14 and eighth 13 elements I. The outputs of the counters 20 and 21 are connected, respectively, to the inputs of the decoders 22 and 23 of the zero state, the outputs of which are connected respectively to the inputs of the formers 24 and 25 pulses and with third inputs

the sixth 14 and eighth 13 elements I. The outputs of the formers 24 and 25 pulses arrive at the corresponding inputs of the elements OR 26, the output 27 of which is the second input of the device.

According to the operation identity in the device, two functional blocks 28 and 29 can be distinguished, each of which contains two AND elements, a reversible counter, a zero state decoder and a pulse shaper.

The device works as follows.

A monotonous pulse sequence arrives at the input bus 1. The leading edge of the measured pulse switches trigger 2, at the first output of which a unit potential appears that permits the passage of pulses from the generator 16 output to the summing input of the counter 5 through element 8. , a single potential from the first output of trigger 2 permits the passage of pulses from the output of the generator 16,

5 delayed for half the period of the frequency of this generator by the element 17 of the delay, on the subtracting input of the reversible counter 6 - through the element And 11.

As the measured pulse decays, the arrival of the counting pulses from the generator 16 to the counter 5 stops, and the zero counter zeroes from the output of the OR 4 element.

The front of the next measurable

5 impulses arriving at the counting input of trigger 2, a single potential is set at the second output of flip-flop 2, which allows the counting pulses from the generator 16 to pass to the summing input of counter 6 through element 10. In addition, the single potential from the second output of trigger 2 permits the passage of the counting pulses from the output of the generator 16, delayed by a half

5 period of the element 17 delay, on 1 readout input of the reversible counter 5.

Thus, during the next measured pulse, its duration is measured by counter 6 and the state of counter 5 is read. After the end of the measured pulse by zero potential from the output of the element OR 3, counter 5 is zeroed.

In the process of working counters 5 and 6 of them

5, the output codes are constantly compared at the comparison block 18 and, when the first output bus 19 is equal, a pulse appears that fixes the middle of the previous pulse relative to the front of the measured pulse.

Functional units 28 and 29 are identical in their construction and operation principle and work alternately.

With the arrival of the measured pulse on bus 1, one of the functional blocks 28, 29 measures the time interval concluded between the moments of appearance of the front of the output pulse from the first output bus 19 and the decline of the measured pulse, and during the next measuring pulse a similar measurement is made by another functional block.

After measuring the time interval, each functional unit fixes its center for the next measuring pulse.

The functional unit 28 operates as follows.

The input measuring pulse from bus 1 sets up a trigger 2 with its front in such a state that a single potential is formed at its first output, which is fed to the second input of element 12. After that, after a time interval equal to half the duration of the previous measuring pulse , on the first output bus 19, a voltage pulse appears, which is fed to the second input of the second trigger 7 and sets it to one state. The signal of the unit level from the output of this trigger enters the third input of the element 12 and permits the pulses of the reference generator 16 to pass to the summing input of the reversible counter 20, in which the number accumulates until the appearance of the input measured pulse decreases, which by its zero level will set the trigger 7 to the zero state and prohibit the passage of pulses of the reference 4 generator 16 through the element 12.

Thus, in the reversible counter 20, a number proportional to half the duration of the next measuring pulse will be set.

With the advent of the next measurement pulse, the counting trigger 2 is set in the opposite state, in which element 12 is closed, and element 14 opens, and the pulses of the reference-5 generator 16 through element 14 arrive at the subtractive input of the reversible counter 20 and at zeroing all its bits at the output of the first decoder 22 of the zero state, a 5 signal of the zero level is formed, which closes the element AND 14 and forms the standard voltage pulse at the output of the former 24, which through the third element OR

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26 is supplied to the second output bus. 27 The front of this output voltage pulse captures the center of the now already measured pulse.

Similarly, the second functional unit 29 operates, which in the next measuring cycle at the output of the shaper 25 generates a voltage pulse fixing the center of the measured pulse in real time, and through the second input of the third element IL And 26 and the second output bus 27 directs to the device output.

Thus, when processing a periodic monotonous pulse sequence arriving at the input bus 1, cyclically during each measured pulse on the first output bus 19 a voltage pulse is formed, which is half the measured pulse from the front of the measured pulse, and A second output bus 27 generates a voltage pulse fixing the center of the measured pulse in real time.

With a constant increment, the error in determining the center of the measured pulse in real time is equal to the frequency period of the reference oscillator 16.

A device for determining the midpoint of pulses of a periodic monotonic pulse sequence can be implemented on chips: 133TM2 - triggers 2, 7; 133LAZ - elements OR 3, 4, 26; 133IE7 - reversible counters 5, 6, 20, 21, - 133LA7 - reference generator 16 (using external radio elements): 133LP5 - 133LA2 - reference element 18 - 133LA8 and LZ-MFL-1-600 (delay line) - delay element 17 ; 133LA4 - elements And 8, 11, 12, 15; 133IDZ-decoders22, 23 zero state; 133AG1 - formers 24, 25 pulses.

The proposed device, in contrast to the known ones, allows real-time determination of the midpoints of a monotone pulse sequence.

The proposed device can be used, for example, in devices for tracking the phase of harmonic signals, in particular in displacement transducers (angle) phase-code, and the phase tracking accuracy is improved, since the set phase value is tracked in real time and control an actuator is manufactured without a time delay that cannot be provided with known devices.

In addition, the proposed device can be used in research work, when a quantitative assessment of the derivative of the phase change of the measuring signal of the same frequency is required. In this case, a time shift is used between the output Signal issued on the first output bus and the output signal issued on the second output bus. Formula of the invention. A device for determining the midpoint of pulses of a periodic monotonic pulse sequence according to ed. St. No. 1282072, characterized in that, in order to extend the functionality by determining the midpoint of the pulses of a periodic monotone pulse sequence in real time, an additional trigger, the fifth, sixth, seventh, and eighth elements And, the third and fourth reversible counters, the first and second zero-state decoders, the first and second pulse formers, the third OR element and the second output bus, the output of the reference generator connected to the first inputs of the fifth, estogo, seventh and eighth element, and the first output of the flip-flop .First

It is connected to the second inputs of the fifth and eighth elements, and its second output is connected to the second inputs of the sixth and seventh elements, and the input and first output buses are connected respectively to the first and second inputs of the second trigger, the output of which is connected to the third inputs of the fifth and seventh elements And, while the output of the fifth element And is connected to the summing input of the third reversible counter, the outputs of the bits of which are connected to the information inputs of the first decoder of the zero state, the output of which is connected to the input the first pulse generator and the third input of the sixth element I. The output of which is connected to the subtractive input of the third reversible counter, and the output of the seventh element I is connected to the summing input of the fourth reversible counter, the outputs of the bits of which are connected to the zero state, the output which is connected to the input of the second pulse generator and to the third input of the eighth element I, the output of which is connected to the subtractive input of the fourth reversible counter, the outputs pvogo and second pulse shapers connected to the inputs of the third element 0 OR. the output of which is connected to the second output bus of the device.

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Claims (1)

SUMMARY OF THE INVENTION A device for determining the middle of pulses of a periodic monotonic pulse sequence according to ed. St. 15 N31282072, characterized in that, in order to expand the functionality by determining the middle of the pulses of a periodic monotonic pulse sequence in real 20 time scale, an additional trigger, fifth, sixth, seventh and eighth, is additionally introduced into it. Elements I, third and fourth reversible counters , per. the first and second decoders of the zero state 25, the first and second pulse shapers, the third OR element and the second output bus, the output of the reference generator being connected to the first inputs of the fifth, sixth, seventh and eighth elements And, the first output of the first trigger is connected to the second the inputs of the fifth and eighth elements And, and its second output is connected to the second inputs of the sixth and seventh elements And, the input and first output buses are connected respectively to the first and second inputs of the second trigger, the output of which is connected to the third the inputs of the fifth and seventh elements And, while the output of the fifth element And is connected to the summing input of the third reversible counter, the outputs of the bits of which are connected to the information inputs of the first zero state decoder, the output of which is connected to the input of the first pulse shaper and to the third input of the sixth element And, the output of which is connected to the subtracting input of the third reversible counter, and the output of the seventh element And is connected to the summing input of the fourth reversible counter, the discharge outputs of which are connected inen with information inputs of the second zero state decoder, the output of which is connected to the input of the second pulse shaper and to the third input of the eighth AND element, the output of which is connected to the subtracting input of the fourth reverse counter, the outputs of the first and second pulse shapers are connected to the inputs of the third OR element. the output of which is connected to the second output bus of the device.