SU805197A1 - Method and device for setting phase difference between two harmonic signals - Google Patents

Description

BTOpfcjM integrator inputs respectively 2.

The disadvantage of the device is the impossibility of setting with it the phase shift between two harmonic signals, not necessarily / t ±,

The purpose of the invention is to improve accuracy.

The goal is achieved by the fact that: in the method based on the comparison of additional signals, the duration of one of which is equal to the time interval, the beginning of which coincides with the transition point of one of the harmonic signals through the zero level from minus to plus (from plus to minus), 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 harmonic signals, form the second additional signal, the level of which is proportional to the amplitude value of the first of g Armonic signals, with the proportionality coefficient equal to the sine (minus sine) of a given phase shift, form the third additional signal equal in duration to the time interval, the beginning of which coincides with the transition point of the first harmonic signal through zero from minus to plus (from plus to minus) and the end coincides with the nearest transition point of the first of the harmonic signals through the level of the second additional signal from minus to plus (from plus to minus) for a given phase shift between gar onicheskimi signals in the ranges from O to-MH / 2.I HTA / Y5Gdo 2; or with the nearest transition point from minus (from minus to plus) with 1 phase shift between harmonic signals from 4- to j5r, form the fourth additional signal, proportional to the difference of the first and third additional signals, and information about the magnitude and direction of the phase shift deviation between two harmonic signals from a given receive the largest and sign of the fourth additional signal.

The method is implemented by a device containing the first and second matching blocks and the Ban element in which the amplitude converter & architect, time slot generator and phase time converter are input, the output of the first matching block connected to the first input of the phase time converter, the first JBbM input of the time interval former and its second input through the amplitude converter, the control which gives the input is connected to the control input of the time interval generator, the output of which and the output f zovremennogo transducer are respectively connected to first and second inputs of the element and the second input prohibition fazovremennogo converter connected to the output of the second matching block.

FIG. 1 shows timing diagrams corresponding to a predetermined phase scoop within the range from - F to} in FIG. 2 - the same, with a phase shift ranging from to JT, in FIG. 3 is a block diagram of the device.

In the proposed method, one additional signal is formed (and FIG. 2, b), equal to the actual phase shift between the harmonic signals U and U /. Form the second additional signal (and figure 2, a), the level of which is equal to i PC, where U | - the amplitude value of the harmonic signal U, and the controlled phase shift. Form the third additional signal (figure 1, c and figure 2, c) equal in duration to the time interval whose beginning coincides with the transition point of signal II, through the zero level from minus to plus, and the end with the nearest transition point of the signal U through level the second additional signal from minus to plus (figure 1 for a given phase shift from 0 to and 2ff or with the nearest signal transition point and. through the level of the second additional signal from plus to minus (figure 2, a) for a given phase shift from. Form the fourth additional signal (fig.l, d and fig.2, d) proportional to the difference of the durations of the first and third additional signals, and information on the direction of the deviation of the phase shift between the UL signals and from the given signal is obtained by the sign of the fourth additional signal.

A device that implements the proposed method contains (FIG. 3) matching blocks 1 and 2, amplitude converter 3, shaper 4 time slots, phase-by-phase converter 5 and element 6 Disable.

The device works as follows.

Claims (2)

The compared harmonic signals and and and (FIGS. 1, a and FIG. 2, a) through the matching blocks 1 and 2 arrive at the corresponding inputs of the phase-time converter 5, the output of which is a signal (FIG. 1, b of Fig. 2, b) whose duration is proportional to the actual phase shift between the signals and and is fed to the inverse input of the element b. The signal and also enters the input of the amplitude converter and one of the inputs of the imaging unit 4 time interval. From the output of the amplitude converter 3, a signal (Fig. 1, a and Fig. 2, a), proportional to the amplitude value of the signal C with a proportionality factor / equal to the sine of the monitored phase shift, is fed to the second input of the imaging unit 4. time intervals. From the output of the last signal (Fig. 1, C and Fig. 2, C), the duration of which is proportional to the specified phase shift between the signals U and and., Is fed to the direct input of element 6 Ban, the presence or absence of a signal at the output of which is uniquely determined The direction of the phase shift deviation between the harmonic signals U ,, The proposed method and the device implementing it allow to expand the functionality of the method and improve the accuracy by eliminating the dependence on frequency and its deviation Formula 1, Installation Method phase shift between two harmonic signals based on the comparison of additional signals, the duration of one of which is equal to the time interval whose beginning coincides with the transition point of one of the harmonic signals through the zero level from minus to plus (from plus to minus), 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 harmonic signals, which is characterized by the fact that, in order to increase accuracy, they form the second additional signal, the level of which proportional to the sine (minus sine) of a given phase shift, form a third additional signal, equal in duration to the time interval, the beginning of which coincides with the transition point of the first of the harmonic signals through the zero level with minus to plus (from plus to minus), and the end coincides with the nearest transition point of the first harmonic signal through the level of the second additional signal from minus to pl from (from plus to minus) with a zadgshnom phase shift between the harmonic signals in the intervals from O to U / 2 and from 3/2 to iT or with the nearest transition point from plus to minus (from minus to plus) for a given phase shift between the harmonics signals from before. 3/25 G, form the fourth additional signal, proportional to the difference of the first and third additional signals, and receive information on the magnitude and direction of deviation of the phase shift between two harmonic signals from the given one in magnitude and sign of the fourth additional signal. 2. A device that implements the method according to claim 1, containing the first and second matching blocks and the Ban element / characterized in that it is equipped with an amplitude transducer, a time generator and a phase-shifter, with the output of the first matching block connected to the first phase-time input His converter, the first input of the time interval generator and its second input through the amplitude converter, the control input of which is connected to the control input of the time interval generator The output of which and the output of the phase converter are connected respectively to the first and second inputs of the Inhibit element, and the second input of the phase change converter is connected to the output of the second matching unit. Sources of information taken into account during the examination 1. USSR author's certificate No. 568896, cl. Q 01 R 17/00, 1976. 2. USSR author's certificate for application No. 2501626 / 18-21, cl. Q 01 8 25/00, 06/27/77. V r ItSint B c but C Cip / S Fig If