SU1328762A1 - Digital phase meter of instantaneous values - Google Patents

Abstract

The invention relates to the field of digital measurement technology and can be used in information-o-measurement systems for converting phase shifts into a code with fixation of maximum and minimum results. The aim of the invention is to simplify the design of the phase meter, which is achieved by introducing new functional connections. The phase meter contains driver 1, elements 2, 4, and 11, counters 3 and 5 pulses, control block 6, reference generator 7, blocks 8 and 9 of code comparison, register 10, and recording block 12. The positive effect is achieved with the exception of the prototype trigger and a one-shot in the control unit that generates pulse control signals along the leading edges of the output pulses of the driver 1. This increases the reliability of the phase meter, reduces its cost and consumed energy. 3 il. (L

Description

The invention relates to digital measurement technology and can be used in information measuring systems for converting phase shifts into a code with fixing extreme (maximum or minimum) results.

The aim of the invention is to simplify the design of the device.

FIG. 1 shows a phase meter diagram; Fig 2 shows timing diagrams of the phase meter; in fig. 3 — blocks of comparison of codes based on a standard integrated circuit.

The phase meter contains (Fig. 1) shaper 1, the first element And the pulse counter 3, the second element AND 4, the second counter 5 pulses of the control block 6, the reference generator 7, the first 8 and second 9 blocks of code comparison, register 10, the third element And 11 and the recording unit 12. The inputs of the imager 1 are connected to the inputs of the device, and the output through the first element And 2 - to the counting input of the first counter 3 pulses and the first input of the second element And 4, the output of which is connected to the counting input of the second counter 5 pulses, Input control unit 6 is connected to the output one generator and an output to the input. Resetting the first counter of 3 pulses. The output of the reference generator 7 is connected to the second input of the first element AND 2, the inputs of the first block 8 of the code comparison are connected to the co-outs of both imguls, and the Equals (A) output with the second input of the second element And 4, the inputs of the second block 9 comparison codes are connected to the code outputs of the first pulse counter and register 10, and the output is Less (A "B) - to one of the inputs of the third element And 11, the other input of which is connected to the output of the block control, and the output - to control The main input of the register 10, the information input of which is connected to the code output of the first pulse counter (A and B - codes, taken from the outputs, respectively, of the counters 3 and 5 pulses). In the digital phase meter, the control input of the recording unit is also connected to the Reset input of the first pulse counter (FIG. 1, dashed line).

Digital phase meter works as follows.

Pulse Initial state (reset circuit from control unit is not shown) both counters 3 and 5 pulses are set to zero, and register 10 records the number N, which is certainly greater than the possible minimum phase shift between the input voltages (in particular, N can be selected equal to 111 ... 11). At the output Equals (A) of the code comparison block 8 connected to the outputs of like bits (code outputs) of the indicated counters, a high level potential 1 (Fig. 2, signal e) is set, which served on manager

input element AND 4 and prepares it. Level 1 potential is removed from the output Less () of code comparison block 9 (FIG. 2, signal g), is applied to control input of element 11 and prepares it. Blocks 8 and 9 can be executed, for example, - based on a standard integrated circuit integrated in such a way as to ensure the implementation of the corresponding function (FIG. 3 a — for block 8, FIG. 3 in — for block 9) „Shaper 1, to the inputs of which the voltages under study are And And Uj , forms rectangular impulses with duration, proportional the measured phase shift cf (Fig. 2, signal a Эти These pulses control the element I 2, by opening it for a time, while the clock

high frequency pulses from the generator output 7 (Fig 2, signal b) pass to the counting input of the counter 3 pulses directly (Fig. 2, signal c), to the counting input of the counter 5 pulses through element 4 (Fig. 2, signal g ), open by the resolving potential from the output of block 8 (Fig. 2, signal e), the level I of which remains unchanged all

time, until the condition of equality of codes at the inputs of the specified block is observed. At the moment of time corresponding to the falling edge of the first output pulse of the Former 1 with duration b (Figo 2, signal a), the pulse signal from the output of control unit 6 (Fig. 2 signal e), made, for example, in the form of a single vibrator, resets counter 3 to zero on

the code at the inputs of block 8 is violated, the potential at its output is equal to (A. c) abruptly changes to logic level O (fig 2, signal e), blocking element 4, and in the counter 5 pulses the code .N,, proportional T,.

The further operation of the digital phase meter (in the mode of marking and fixing the maximum value of Cf) depends on the ratio of the durations of each subsequent and previous maximum (in duration) output rectangular pulse of shaper 1, for example, if the next pulse of the specified shaper has

duration x V,

(Fig. 2, signal a), then the contents of counter 3 as the clock pulses of the generator 7 arrive at its counting input through the element 2 increases (Fig 2, signal c). At the time when it becomes equal to the code stored in counter 5 (that is to code N,), block 8 triggers and gives the permitting potential 1 to the control input of the element 4, opening it (figo 2, signal e),

The generator 7 impulses start to pass to the counting input of counter 5 (figo 2, signal g), the code in which, starting from the specified time point, is incremented proportional to the difference c - o, block 6. the impulse signal from its output, corresponding to the time of occurrence of the falling edge of the output pulse of shaper 1 with duration t (Fig 2, signal e), resets counter 3 to zero. At the same time, the potential at the output of block 8 changes to logic level O

the measurement cycle.

In parallel with the described process, the minimum value of cf is involved in the process of selection and fixation with the participation of block 9 of code comparison, register 10 and AND 11, the pulse signal from the output of block 6 of the control signal (FIG. 2,

10, signal e), corresponding to the trailing edge of the first rectangular pulse of the former 1 with the duration o (FIG. 2, signal a), passes through an open permissive potential

15 1 exit less. (A: C) of block 9 (fig, 2, signal g) element 11 (fig 2, signal h) to the control input of register 10 and allows overwriting the contents of counter 3 into it,

20

proportional (, The same signal with a certain delay resets counter 3 to its original (zero) state. Delay is necessary in order to have time to rewrite the contents

25 counter 3 to the register until it is reset

If the next rectangular pulse from the output of shaper 1 has a duration: cTj is longer than c,,

As a result, also t, e "c t, (fig, 2, signal a), then

a certain point in time the contents of counter 3 becomes greater than code N, in register 10, the output potential is Less (L: V) of block 9

2g abruptly changes to the logic level O (figo 2, signal g) and blocks element 11, resulting in a pulse signal generated by control unit 6 at the moment

40, the time corresponding to the falling edge of the pulse with duration G (Figo 2, signal e), does not pass to the control input of register 10 (Fig 2, signal h) and the result is stored in it (Fig 2, signal e), the element ANDA of the block jg tat (N,). of the preliminary measurement, is unblocked, and in the counter 5 there is a code proportional to T,

If the next pulse of driver 1 has a shorter duration than o.j. , t, e. -C, {t: 4) C-2 (FIG. 2, signal a), then the contents of counter 3, as clock pulses arrive, its counting input grows, but does not reach the code stored in counter 5 (AND ) Therefore, block 8 does not work, the contents of counter 5 does not change, and after resetting counter 3 to O with a pulse signal from the output of the control unit (Fig. 2).

50

a smaller value T, (Cf,). Counter 3, as before, is reset by the indicated pulse signal to the zero position.

If a subsequent rectangular impulse from the output of shaper 1 has a duration €, less than,, i.e. T, t, and the following condition is fulfilled: but condition A B (fig 2, signal a), g then potential 1 from the corresponding output (A - b) of block 9 (fig 2, signal g) opens the element i 11, and the pulse signal generated by the control unit 6 at the time instant, corresponding to

the measurement cycle.

In parallel with the described process, the minimum value of cf is involved in the process of selection and fixation with the participation of block 9 of code comparison, register 10 and AND 11, the pulse signal from the output of block 6 of the control signal (FIG. 2,

signal e), corresponding to the trailing edge of the first rectangular pulse of imaging device 1 with a duration o, (Fig 2, signal a), passes through an open permissive potential

1 less exit. (A: C) of block 9 (fig, 2, signal g) element 11 (fig 2, signal h) to the control input of register 10 and allows overwriting the contents of counter 3 into it,

20

proportional (, This is the same sign (N,). of the pre-measurement,

a smaller value T, (Cf,). Counter 3, as before, is reset by the indicated pulse signal to the zero position.

If a subsequent rectangular impulse from the output of shaper 1 has a duration €, less than,, i.e. T, t, and the following condition is fulfilled: but condition А В (fig.2, signal a), then potential 1 from the corresponding output (A - b) of block 9 (fig.2, signal g) opens element 11 , and the pulse signal generated by the control unit 6 at the time instant, corresponding to

The leading edge of a pulse with a duration tTj (Fig 2, signal e) passes through this element AND (Fig. 2, signal h) to the control input of register 10 and allows overwriting the contents Nj of counter 3 into it, after -tJero the latter is reset to zero. The measurement cycle for f T is carried out in a similar way, (FIG. 2, signal a) with overwriting in the register 10 of the code. N, displaying with (H)

By resetting the counter 3 to the zero position, each pulse signal from the output of the control unit 6 simultaneously allows the registering unit 12 to read the extreme results — the maximum (from the counter 5 in the following sequence N ,, N, N ,, N, ....) and minimum (with in

2.g register

lower cost and less power consumption.

Claims (1)

Formula of Invention five. An instantaneous digital phase meter containing a driver. the inputs of which are connected to the inputs of the device, and the output through the first element t I - to the counting input of the first pulse counter and to the first input of the second element I, the output of which is connected to the counting input of the second pulse counter, control unit whose input is connected to the output driver, and the output - to the input. Reset the first pulse counter, the reference generator, the output which is connected to the second input the next successor 20 of the first element And the first block comparison codes, the inputs of which are connected to the code output of both pulse counters, and the output Equal to the second input of the second element And 25 the second comparison block of the codes whose inputs are connected to the code outputs of the first pulse counter and the register, the third element And, the first input of which is connected to the output carry: N ,, N ,, N ,, N, ..). Thus, at any current time, the last result recorded in the recording unit from counter 5 (register 10) corresponds to the measurement result of the maximum (minimum) value of the phase shift between the input voltages. Consequently, the proposed digital phase meter provides the same as 30 control units, and the output to the control is known metrological characteristic register input, information, but it has a simpler design, since it is excluded Its input is connected to the code output of the first pulse counter, and the registering unit, whose inputs are connected to the code outputs of the second pulse counter and register, characterized in that, in order to simplify the design, there is an output Less than the second code comparison unit connected to the second input of the third element and directly the need to use a trigger, as well as a second one-shot vibrator, comprising the control unit, which forms the pulse control signals along the leading edges of the output pulse of the former. Thus, the proposed phase meter has increased reliability. lower cost and less power consumption. Invention Formula . An instantaneous digital phase meter containing a driver. the inputs of which are connected to the inputs of the device, and the output through the first element t I to the counting input of the first pulse counter and to the first input of the second element I, the output of which is connected to the counting input of the second pulse counter, the control unit whose input is connected to the output of the driver, and the output is to the input Reset the first pulse counter, the reference generator, the output control block, and the output is to the control input of the register, the information Its input is connected to the code output of the first pulse counter, and the registering unit, whose inputs are connected to the code outputs of the second pulse counter and register, characterized in that, in order to simplify the design, there is an output Less than the second code comparison unit connected to the second input of the third element and directly  Puz.Z LO Ш1 Compiled by Yu. Makarevich Editor O. Golovach Tehred M. Khodich Corrector L. Pilipenko Order 3480/48 Circulation 730 Subscription VNIISH State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5 Production and printing company, Uzhgorod, st. Project, 4 Fig.Z