SU741188A1 - Method and device for setting phase shift between two harmonic signals of equal frequency - Google Patents

Description

The aim of the invention is to increase the accuracy of the phase shift setting from the monitored value determined by the ratio h / q l; where q l, 2,3 ... / h 1,2,3 ... q -1, with h q.

This goal is achieved by the method of establishing a phase shift between two harmonic signals of the same frequency based on comparing additional signals, one of the additional signals formed proportional to the time interval, the beginning of which coincides with the transition point through zero from minus to plus (from plus to minus) one of the signals, and the end coincides with the nearest point of transition through the zero level from minus to plus (from plus to minus) of the second of the compared signals, is formed in An additional signal, the beginning of which coincides with the beginning of the first additional signal, duration proportional to the time interval q / h from the first additional signal, forms the third additional signal with a duration proportional to the time interval, the beginning of which coincides with the end of the second additional signal, and the end coincides with the nearest the point of transition through the zero level from minus to plus (from plus to minus) of the first of the compared signals forms the fourth additional signal, proportional to the difference for the second and third additional signals, and the information on the deviation of the phase shift between the compared harmonic signals from the monitored value is determined by the magnitude and sign of the fourth additional signal at the time of termination of the third additional signal.

The goal is the realization

This method is achieved by the fact that the device containing the first and second matching blocks, the output of one of which is connected to the input of the first amplifier limiter, and the output of the second through the second amplifier limiting device is connected to the inverse input of the Restriction element, the output element of which is connected to one of the integrator inputs, equipped with a pulse shaper, a pulse spreader and an element NOT, and the output of the first amplifier limiter is connected to the information input of the Ban element and through the pulse shaper with ne of the inputs of AND, yield prohibition dilator member through the pulse coupled to the second input of the integrator via a NOT element with a second input member I.

The essence of the method is explained in the time diagram (see Fig. 1) for the case when it is necessary to establish the phase shift between the two compared harmonic signals, - 31; moreover, FIG. 1 (a) corresponds to the case when, and FIG. 1 (6) - case IA, 6/9, where IP is the phase shift of the signal Uv relative to П,. Form the first additional signal, proportional to the set Phase shift between the compared harmonic signals (Fig. 1, line b), form the second additional signal, duration which is proportional to if FIG. 1 line с), form the third additional signal with a duration proportional to the time (emu interval, the beginning of which coincides with the end of the second additional signal, and the end coincides with the nearest transition point through the zero level from minus to plus (from plus to minus) of the first harmonic compared signals (figure 1 line d), form the fourth additional signal (figure 1 line e), proportional to the difference of the second (figure 1 line) and the third (figure 1 line d) additional signals, and information about the deviation of the value of F The relative shift between the compared harmonic signals from the monitored value is determined by the magnitude and sign of the fourth additional signal (Fig. 1, line e) at the time of termination of the third additional signal.

2 shows a block diagram of a device implementing this method.

The DEVICE contains the first and second matching blocks 1 and 2, the first and second limiter amplifiers 3 and

4, forms; 1pluvatel pulses 5, the element of the Prohibition b, the expander pulses 7, the element And 8, the element NOT 9 and the integrator 10.

The operation of the device is as follows.

One of the phase-matched harmonic signals is fed through the matching unit 1 to the input of the amplifier-limiter 3 (Fig. 1, line a), from which the signal with a duration proportional to half the period of the compared harmonic signal and, is fed in parallel to the information input of the Ban 6 and to the pulse shaper input

5, from the output of which is fed to one of the inputs of the element E 8. The second harmonic signal Uj compared in phase is fed through the matching unit 2 to the input of the amplifier 4 (Fig. 1, line a),

Claims (2)

from the output of which a signal with a duration proportional to half the period of the compared harmonic signal t is fed to the inhibiting input of the element Ban 6. The output signal from the last (FIG. 1 row b) proportional to the controlled phase shift between the compared harmonic signals is fed to the pulse expander 7,. from the output of which (Fig. 1a, line c) is expanded 3 times or (| mg. 16 line c) extended by 9/5 times the signal through the inverter is fed to the second input of terminal 8. 8. The inputs of the integrator 10 are received, according to However, the signal from the output of the pulse expander 7 (Fig. 1, line c) and the signal from the output of the And 8 element (Fig. 1, row d). The magnitude and sign of the signal from the integrator output (Fig. 1, line e) carry information on the deviation of the phase shift between the compared harmonic signals from the given value. Using the method and device that implements this method allows one to establish the phase shift, determined by the relation - Jt, where q 1,2,3 ...; h 1,2,3 ..., q - 1 at h q, between the compared harmonic signals of the same frequency with greater accuracy, which is of great importance when developing devices for the process control system. Claim 1. A method of establishing a phase shift between two harmonic signals of the same frequency, based on comparing additional signals, one of the additional signals being proportional to the time interval, the beginning of which coincides with the point of transition through the zero level from minus to plus (from plus to minus ) one of the signals, and the end coincides with the nearest point of transition through the zero level from minus to plus (from plus to minus) of the second of the compared signals, characterized in that the aim of improving the accuracy of the installation of the phase shift, determined by the ratio of the form 3t, where, 2,3 ...; , 2,3 ..., q-1, at hq, form the second additional signal, the beginning of which coincides with the beginning of the first additional signal, the duration proportional to the left time interval q / h from the first additional signal, form {the third additional signal, the signal duration proportional to the time interval, the beginning of which coincides with the end of the second complementary loop, the end coincides with the closest (the transition point through the elevation level from minus to plus (from plus to ynus) of the first of the compared signals, form the fourth The additional signal is proportional to the difference between the durations of the second and third additional signals, and the information on the deviation of the phase shift between the harmonic signals from the monitored value is determined by the value:, sign of the fourth additional signal at the time of termination of the third additional signal. 2. A device implemented in accordance with Claim 1, comprising the first and second matching blocks, the output of one of which is connected to the input of the first amplifier-limiter, and the output of the second through the second amplifier-limiter connected to the inverse input of the Ban element, element I, the output of which is connected to one of the integrator inputs, characterized in that —WHAT., it is equipped with a pulse shaper, an extension of the pulses and an element, NOT, and the output of the first amplifier-limiter is connected to the Information input of the Ban element and pulse generator with one of the elet- lent-I inputs, the output of the prohibition through the pulse expander is connected to the second input of the integrator and through the element NOT to the second input of the element I. Sources of information taken into account during the examination 1. USSR author's certificate No. 568896, cl. G 01 R 17/00, 1975.