SU1019363A1 - Device for comparing phase shift of square periodic signals - Google Patents

Description

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The invention relates to a measurement technique and can be used in the following positioning systems for rapid (electronic) processes with extended phase shifts as a digital compensator for the development of a target and error indicator from the phase shift tolerance region.

A device for comparing the phase shift of rectangular periodic signals, comprising a phase discriminator consisting of a trigger and two drivers, outputs connected to the corresponding trigger inputs, and an integrator, an adder, one of the inputs of which is connected to the integrator output and the second input connected to the output of a digital-to-analog converter, the inputs of a reversible counter connected to the digital buses, the input of a phase 3 reverse coupler connected to the analyzer

The disadvantage of the device is the low speed due to the fact that the phase reversal analyzer triggers during the passage of two pulses at once, which become indistinguishable during the fast process.

The closest to the J8 is the device for comparing the phase shift of rectangular periodic signals containing a phase discriminator consisting of (Trigger and two drivers, outputs connected to the corresponding trigger inputs, as well as an integrator and adder, one of the inputs of which is connected to the integrator output, an element, two keys, a switch for switching keys, two load resistors, two differentiating chains, a delay element, two triggers, an expansion of the measuring range, and two indicators of flipping f the basics of C 2 D.

A disadvantage of the known device is the lack of information content, which is expressed in that the device cannot be used for work in positioning systems with extended phase shifts.

The aim of the invention is to expand the functionality of the device by increasing the information content.

193632

This goal is achieved by the fact that the device for comparing the phase shift of rectangular periodic signals, contains two elements spun-connected to their outputs, 2I, an integrator, two keys, connected by control inputs to the outputs of the key switching trigger, differentiating circuits and two About the phase expansion counter, two additional elements 2I, two comparators, a generator of filling pulses, a divider, two additional counters, an element 2ILI, a selector, a second integrator and a 1K trigger, were introduced; The former driver is connected to the first inputs of the second and third elements 2I, and the second driver's input - to the second, 20th input of the second element 2I directly, and to the second input of the third element 2I through an inverter, while the second element 2I is connected to the first input of the trigger - switching 25 keys directly and through the first integrator - to the first inputs of two comparators, the second inputs of which through the second integrator are connected to the output of the third element 0 2И, and their outputs - to the information inputs of the 1K-trigger, the counting input combined with the output of the first element 2I, with the input of the selector and with the counting inputs of two counters of phase expansion, the information inputs of which are connected to the outputs of the fK-trigger, and the R-inputs to the output of the element 2IL, to the second input of the trigger switching of keys and the second R-inputs 0 of two additional counters, the first R-inputs combined with the output of the divider, the input connected to the output of the generator of filling pulses connected via keys to the counting inputs of additional counters, while the R and S inputs 1K-trigger is connected to the inputs of the element nta 2ILI connected to the outputs of the selector, the inputs connected through a differentiating circuit to the outputs of the respective comparators.

FIG. 1 is a functional diagram of a device for comparing the phase shift of rectangular periodic signals in FIG. 2 diagrams and voltage plots explaining the operation of the proposed device. The device contains drivers 1 and 2, three elements 2И 35 inverter 6, two integrators 7 and 8, two keys 9 and 10, trigger switch 11 11, differentiating circuits 12-1 and 12-2, two counters 13 and 1 phase expansion 1K trigger 15 two comparators 16 and 17, generator 18 filling pulses, divider 19 counters 20 and 21, element 2ILI 22 and selector 23. Designations in FIG. 2: Cnp and reference signal squares; output diagram of the second element 2I; Int:;, - plot of the output of the first integrator; .inv inverter output diagram; And - the output diagram of the third element 2I; Int - plot of the output of the second integrator; The diagrams of the input voltages at the inputs of the first and second comparators; AND - (- the output diagram of the first 2I; ". 1v 1X element {output diagrams of the first and second comparators; Tp is the diagram of the direct output of the key switching trigger; Tp 1 inv - the diagram of the inverse output of the key switching trigger; - forward output diagram and 1K trigger; Tr 2 inv - inverse output diagram of 1K trigger. The device works as follows: Formers 1 and 2 provide the differentiation of the reference signal% n of the feedback signal / d. .% n and%) on the front of rectangular periodic signals (meanders). The formers are made on the basis of operational amplifiers and produce impulses of a relatively long duration. The first element 2 and 3 generates strobe pulses at the moments of coincidence of differentiated signal fronts (fig, -2, diag. I) with relative movement of the meanders, which occurs when phase mismatches occur. 34 . The second and third elements 2I C and 5 with an inverter 6 are similarly achievable to a phase discriminator based on a PS flip-flop with 11 cursors connected to the inputs of this flip-flop and provide the formation of signals that are formed on the direct and inverse outputs of the RS flip-flop (Fig , 2, diagram i allocates, the meander element 2I falls between the signals 4L-, and (fig. 2, diag. Mg), and element 2I 5 between the signal DPd the inverted feedback signal (figure 2, .. diagrams, and), integrators 7 and 8 convert the pulse signal produced by the element 1 2I and 5 to constant voltage levels (for phase shift (+ LF) between the signals Chr and os% n "j jfooTBeTCTBeHHo U ,, and 2 (fig, 2 diagrams, MjH I). Plots of changes of these levels And - And And Int 1 and Int 2 Tfig, 2) diagrams, the combined stress diagram is given in the diagram (Fig. 2), with voltages affecting the comparator inputs of comparators 1b and 17. In accordance with the effect of the indicated voltage levels on the comparator inputs 17, they are switched to the corresponding YES states (FIG. 2, dia. K ebfit gvyh- 1K-trigger 15 is triggered when a strobe pulse arrives on the & fo counting input (FIG. 2, diag. Tr 2 pr and Tr 2 inv), If there is potential 1 at the I-trigger input 15, then When the strobe pulse arrives at the counting input, it switches to the .1 state, and if there is a potential at the K input. According to the state diagram of the j OMnapaTppoB, 16 and 17 (FIG. 2, dia. Vi K, the comparator 17 provides the potential 1 with a positive mismatch (+ lH} from the moment of the in-phase condition O and during the transitions (+2), (+4) ,,., Thus, the 1K-trigger 15 with the mismatch x (+ lH) and p When switching its counting input by coincidence strobe pulses, it can only be found in state 1 along the direct output (FIG. 2, Diagram, Tr 2 pr) of the omparator 16 provides potential 1 with a negative error (-df) from the moment of the common mode O and during transitions (-2), (-4),., (Fig. 2, diag.,; And, according to the previous, provides a 1K-flip-flop state 5: potential O at the direct output (Fig. 2, diag.) And potential 1 at inverse (fig, 2, Tr 2 inv).

The state of the 1K flip-flop 15 determines the possibility of switching the counters 13 and I and the extension of the phase. If the IK inputs of these counters have a potential O, then the counter switching on the counting input is prohibited, and if potential 1 is allowed. According to (FIG. 2, Diag. Tr 2 Pr) when there is a mismatch (+ LCH, the counter is resolved by the phase expansion counter 13 and the counter is disabled by the counter. And, the counter is resolved only in the area of negative phase mismatches (LP)) (FIG. 2 , dia, Tr 2 inv).

Let the counter 13 and AND the phase extensions be reset by the R inputs from the external control (shown), and the reset is made with a small mismatch () (figure 2, dia, Kgj () when the voltage is applied to the comparative inputs of the comparators 1b and 17 and VJ U2. The positioning system, in which cocfaBe contains a phase shift comparison device, tends to develop a phase mismatch (+ L, In the error matching process, and and at the inputs of the comparators 16 and 17, according to the voltage plots, 8 states of synphase U are compared - -U, and when overrun / negative mismatches (-L). At this transition, the comparators 16 and T7 will work: the first will go to the plus-state, and the second to the minus-state (FIG. 2 OUT diagram provides the corresponding 1K-flip-flop 15 (FIG. 2, dia, Tr 2 pr and Tr 2 inv), and with the help of differentiating circuits 12-1 and 12-2, the selector 23 and the element 2I 22 a strobe pulse is formed. It is formed as in transitions of the syn phase state O - the origin from shifts (-fA) to shifts (-4V) and vice versa (FIG. 2, dia. AND.,)

The functional purpose of the selector is to provide the formation of a gate of the origin of the countdown - the in-phase state and

knitting knuly (fig. 2, diag. of information accumulated in the counters. Using the strobe pulse generated by the selector, the corresponding phase direction counter is reset if, after the phase error broadens,

The strobe-pulse generated in the common-mode state zeroes the counters 13 and 1, and, depending on the magnitude of the phase mismatch change and its sign, the digital information accumulates on one or the other.

5 Another phase expansion counter for the zero state of the adjacent counter.

The key switching trigger 11, keys 9 and 10, filling pulse generator 18, divider 19, and counters 20 and 21 provide complex digital code information about the magnitude of the phase mismatch and the speed of its change between the signals of the reference Vpf and feedback Q, each of the counters is filled with pulses according to the sign of the phase mismatch, while the adjacent counter is in the zero state.

Let the phase mismatch (-uf) (FIG. 2, diag. Tr 1 pr) be such that trigger 11 clods. key mutations by the leading edge of the pulse of the second element 2I k (FIG. 2,

Diagram 2 is transferred to state 1 at the forward exit. The key 9 (Fig. 1) goes into a conducting state and ensures that the counter 20 is filled with the pulses of the generator 18 of the filling pulses up to a certain digital value a ij at. the condition for slow processing (d mismatch to the in-phase state O (Fig. 2, Tr 1 pr). If the error is greater (-4) (-th, and the work is done at the same speed, then the digital value in counter 20 is more: aaa. With fast processing, for (-, 4,) the digital value a is less than (). Therefore, if the intensity of the hatwork W is proportional to the digital values of counters 20 and 21,

where K is the proportionality coefficient, then

And 3 b

7

The intensity of testing Wj with a quick change in the mismatch / and a small mismatch is the smallest. With a large mismatch, I4; | intensity is greatest.;

This is equivalent to the action of a flexible feedback or damper, which calms the positioning system and provides minimal overshoot and oscillation.

Divide 19 provides a clock reset of counters 20 and 21 at the I-input (the R2 input is reset in the in-phase state) V At positive phase shifts {+ L state 1 of trigger 11 at its inverse output (Fig. 2, dia. Tr 1 inv) is provided by a sequence of pulses: the common-mode strobe-pulse (Fig. 2, IG.) And the leading edge of the pulse from the output of element 2I C (Fig. 2, IG.), The filling of the counter 21 is provided by opening the key nineteen.

Under the action of perturbing the | f1X factors of different ictiness, arise as small phase mismatches that are within the range (-2) ..

193638,

,. () is displayed by 1 and "|) with information counters 20 and 21, as well as 13 and f), as well as larger, fixed 1" | to step 31 1 and 4 phase 5 counters.

Depending on the setting of the division factor of divider 19, the ratio between the proportional component of the phase distribution 10 of the matching and between its derivative rate of this error varies, which changes the digital information of the distribution of 1tel | The other counts are 1 "4k 8 20 and 21, and the norr" is interpreted by aaicpiH up i5.

Essential # "differences in the front of the agitatable device by cp1v" in "with the famous devices of comparison of the phase shift is

20 informative. It would be useful to use the proposed device in the systems of unlicensed positioning with extended phase mismatches and with digital

25 information on these discrepancies and gives the opportunity to flexibly form the necessary control zern 0 0% d% s {Phase f1 / g.1

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Claims (2)

DEVICE FOR COMPARISON OF PHASE SHIFT OF RECTANGULAR PERIODIC SIGNALS, containing two formers with 2I elements connected to their outputs, an integrator, two keys connected by control inputs to the switch switching trigger outputs ^ differentiating circuits and two phase expansion counters, which is different from that , in order to expand the functionality by increasing the information content, two additional 2Y elements, two comparators, a filling pulse generator, a divider, two additional counters, an ele UNT 2 OR, selector, second integrator and | K-trigger, while the input of the first driver 'is connected to the first inputs of the second and third elements 2I, and the input of the second driver is connected to the second input of the second element 2I directly, and to the second input of the third element 2I through the inverter, while the second element 2I is connected to the first input of the key switching trigger and directly through the first integrator to the first inputs of the two comparators, the second inputs of which are connected through the second integrator to the output of the third element 2I, and their outputs to the info the input | K-trigger, the counter input combined with the output of the first element 2I, with the input of the selector and with the counting inputs of two phase expansion counters, the information inputs of which q are connected to the outputs of the I K- trigger, and the R inputs are connected to the output of the 2 ILY element, 'to the second input of the key switching trigger and the second R-inputs of two additional counters ·, the first R-inputs combined with the outputs of the divider, the input of the filling pulse generator connected to the output, connected through the keys “to the counting inputs of additional counters , The R- and S-1K-trigger inputs connected to the inputs of the element 'ment 2or connected to the outputs. selector inputs connected 'through differentiators, circuit to output ^; I will give the appropriate comparators.