RU100286U1 - MEASURING GENERATOR - Google Patents

Abstract

The invention relates to devices for generating signals with a given phase shift between voltages or currents, in particular to measuring generators with two outputs. The technical result is the expansion of the scope of the generator by providing a phase shift range of the generated signals in the range from 0 to 360 degrees. The measuring generator contains a serially connected master oscillator, a 90-degree phase shifter, a first adjustable attenuator and a first adder, the output of which is the first output bus of the generator, a second adjustable attenuator, the input of which is connected to the output of the master generator, and the output to the second input of the first adder, a series-connected inverter, the input of which is connected to the output of the first adjustable attenuator, and a second adder, the second input of which is connected to the output of the second adjustable attenuator a tensor, and the output of the second adder is the second output bus of the generator. 2 ill.

Description

The invention relates to devices for generating signals with a given phase shift between voltages or currents, in particular to measuring generators with two outputs.

The closest in technical essence to the proposed utility model is a two-phase measuring generator (Koltik E.D. Measuring two-phase alternators. M., Publishing House of Standards, 1968, p. 33, Fig. 13), selected as a prototype. The prototype device contains a serially connected master oscillator, a 90 degree phase shifter, a first adjustable attenuator and a first adder, the output of which is the first output bus of the generator, a second adjustable attenuator, the input of which is connected to the output of the master oscillator, and the output to the second input of the first adder.

The disadvantage of the prototype device is the limited scope due to the range from 0 to 180 degrees (or from -90 degrees to +90 degrees) of the uniquely generated phase shifts of the generator output signals due to the limited amount of the possible task of the phase shift in the phase-setting circuits. Such a region of generated phase shifts of the generator output signals makes it possible to use the generator only for unambiguous and accurate verification and tuning of phase meters in a narrow range of phase shifts and does not allow checking and tuning phase meters in a wide range of phase shifts up to 360 degrees, as is required, for example, in phase direction finders.

The technical result consists in expanding the scope of the generator by providing a phase shift range of the generated signals in the range from 0 to 360 degrees.

To achieve the specified technical result, a measuring generator containing, in the same way as the prototype, is connected in series with a master oscillator, a 90 degree phase shifter, a first adjustable attenuator, and a first adder, the output of which is the first output bus of the generator, a second adjustable attenuator, the input of which is connected to the output of the master oscillator, and the output to the second input of the first adder, in contrast to the prototype, introduced in series connected inverter, the input of which is connected to the output of the first uliruemogo attenuator and a second adder, the second input of which is connected to the output of the second variable attenuator and the output of the second adder is an output of the second generator bus.

The essence of the utility model is illustrated in the drawing, where

figure 1 presents the functional electrical circuit of the measuring generator, where the notation is introduced:

1 - master oscillator;

2 - phase shifter 90 degrees;

3-1, 3-2 - the first and second adjustable attenuators;

4-1, 4-2 - the first and second adders;

5 - inverter;

figure 2 presents vector diagrams explaining the processes occurring in the measuring generator.

The measuring generator (figure 1) contains a serially connected master oscillator 1, phase shifter 90 degrees. 2, the first adjustable attenuator 3-1 and the first adder 4-1, the output of which is the first output bus of the generator, the second adjustable attenuator 3-2, the input of which is connected to the output of the master oscillator 1, and the output to the second input of the first adder 4-1 serially connected inverter 5, the input of which is connected to the output of the first adjustable attenuator 3-1, and the second adder 4-2, the second input of which is connected to the output of the second adjustable attenuator 3-2, and the output of the second adder 4-2 is the second generator output bus .

The measuring generator operates as follows.

The signal U _c (t) from the output of the master oscillator 1 is fed to the input of the phase shifter 2 by 90 degrees. and parallel to the input of the adjustable attenuator 3-2. At the output of the phase shifter 90 degrees. 2, a quadrature signal U _s (t) is generated, shifted by 90 degrees in phase with respect to the phase of the signal specifying the generator 1 U _c (t). The quadrature signal U _s (t) from the output of the phase shifter is 90 degrees. 2 goes to the input of the adjustable attenuator 3-1. The first adjustable attenuator 3-1 controls the amplitude of the quadrature signal U _s (t) in the range from zero to the maximum possible value of U _{s max} (t).

From the output of the adjustable attenuator 3-1, the quadrature signal U _s (t) is simultaneously fed to the first input of the adder 4-1 and to the input of the inverter 5.

From the output of the master oscillator 1, the in-phase signal U _c (f) also enters the input of the adjustable attenuator 3-2, in which the amplitude of the in-phase signal can be adjusted from zero to its maximum value U _{s max} (t).

From the output of the adjustable attenuator 3-2, the in-phase signal U _c (t) is fed simultaneously to the second input of the adder 4-2 and to the second input of the adder 4-1. At the first input of the adder 4-2 receives an inverted quadrature signal U _s (t) from the output of the inverter 5.

Adders 4-1 and 4-2 perform the operation of vector summation of signals according to the laws of vector addition.

By adjusting the attenuators 3-1 and 3-2 of the signal amplitudes (quadrature and common mode) at the inputs of the adder 4-1, at its output you can get the signal U _Σ1 (t) (see figure 2) with a phase shift from 0 to +90 degrees . relative to the voltage U _c (t) of the master oscillator 1.

By adjusting the attenuators 3-1 and 3-2 of the amplitude of the quadrature and common mode signals at the inputs of the adder 4-2, according to the laws of vector addition and taking into account the inversion of the quadrature signal in the inverter 5, the signal U _Σ2 (t) can be obtained at the output of the adder 4-2 ( see figure 2) with a phase shift from 0 to -90 degrees. relative to the voltage of the master oscillator 1.

If we consider the signal U _Σ1 (t) from the second output bus of the device (at the output of the adder 4-2) as the reference output signal of the measuring generator, then at the first output (at the output of the adder 4-1), the value of the resulting phase shift φ _{p of the} signal U _Σ1 (t) will be determined by the formula

φ _p = φ ₁ + φ ₂ ,

where φ ₁ is the phase shift of the signal U _Σ1 (t) relative to the in-phase signal U _c (t); φ ₂ is the phase shift of the in-phase signal U _c (t) relative to the signal U _Σ2 (t).

When setting the zero attenuation of the common-mode signal U _c (t) in the adjustable attenuator 3-2 and changing the amplitude of the quadrature signal U _s (t) in the adjustable attenuator 3-1 from zero to the maximum U _{s max} (t), the value φ _p varies from 0 up to 90 degrees (see figure 2, a).

If, when setting the zero attenuation of the quadrature signal U _s (t) in the adjustable attenuator 3-1, adjust the amplitude of the common-mode signal U _c (t) in the adjustable attenuator 3-2 from the maximum of U _{s max} (t) to zero, then on the first the output of the device, you can get the value of the resulting bias φ _{p of the} signal U _Σ1 (t) from 0 to 180 degrees (see figure 2, b) relative to the reference voltage U _Σ2 (t).

If we consider the signal U _Σ1 (t) of the first output bus of the device as the reference output signal of the measuring generator, i.e. from the output of the adder 4-1, then at the second output of the adder 4-2, the value of the resulting phase displacement φ _{p of the} signal U _Σ2 (t) will be determined by the formula:

φ _p = φ ₃ + 180 ° + φ ₄ = (90 ° -φ ₁ ) + 180 ° + (90 ° -φ ₂ ) = 360 ° - (φ ₁ + φ ₂ ),

where φ ₃ is the phase shift of the quadrature signal U _s (t) relative to the signal U _Σ1 (t); φ ₄ is the phase shift of the signal U _Σ2 (t) relative to the inverted quadrature signal U _s (t).

In this case, when adjusting the amplitude of the common-mode signal U _c (t) in the adjustable attenuator 3-2 from the maximum U _{c max} (t) to zero, the resulting phase shift φ _{p of the} signal U _Σ2 (t) on the second output bus of the device relative to the signal U _Σ1 (t) will vary from 180 degrees to 270 degrees (see figure 2, c).

When adjusting the amplitude of the quadrature signal U _s (t) in the first attenuator 3-1 from the maximum U _{s max} (t) to zero, the resulting phase displacement φ _{p of the} signal U _Σ2 (t) on the second output bus of the device will vary from 270 deg to 360 deg (see FIG. 4-d) with respect to the signal U _Σ1 (t).

The proposed measuring generator with the help of simple adjustments of the amplitude of the quadrature signals allows, based on the use of phase-setting circuits having a limited amount of the task of a possible phase shift, to obtain signals with smoothly changing phase shifts from 0 degrees to 360 degrees at two outputs of the generator, and the amplitudes of the generated signals are equal to each other friend at any required phase shift, which expands the scope of the generator for certification and verification of phase measuring equipment.

Known devices of this type with a wide range of phase shift between the generated signals have a complex structure and are difficult to configure, or have step (discrete) switching from one phase value to another. In the proposed device, the expansion of the scope is achieved by simple technical means.

Claims (1)

A measuring generator comprising a serially connected master oscillator, a 90 ° phase shifter, a first adjustable attenuator and a first adder, the output of which is the first output bus of the generator, a second adjustable attenuator, the input of which is connected to the output of the master oscillator, and the output to the second input of the first adder, characterized in that a series-connected inverter is introduced into it, the input of which is connected to the output of the first adjustable attenuator, and a second adder, the second input of which is connected to the output of the second adjustable attenuator, and the output of the second adder is the second output bus of the generator.