SU1205159A1 - Coordinate transformer - Google Patents

Abstract

The invention relates to devices for measuring the phase shift between two harmonic voltages and can be used in measurement technology. The purpose of the invention is to improve the accuracy of the conversion. The device contains the first and second amplitude-pulse modulators 1 and 2, the first and second comparators 3 and 4, and the generator 5 is triangular. it has high frequency voltage; adder 6, first, second, third, and fourth limiters 7, 8, 9, and 10 — demodulator II, first 19 and second 12 filters, first, second third, and fourth formers 13, 14, 16, and 17 pulses, trigger 15 , a two-half-period rectifier 18, an integrator 20, a sampling-storage unit 21, the first and second information inputs 22 and 23, the inputs 24.25 of the reference voltage, and the first and second outputs 26 and 27 of the device. The introduction of comparators 3 and 4 of shapers 14, 16, and 17 pulses, limiters 7-10, demodulator 11, integrator 20, sampling-storage unit 21, two-period rectifier 18, and education. New connections between the elements of the device TV jnoT. achievement of the goal. 2il. ABOUT)

Description

one

The invention relates to devices for measuring the phase shift between two harmonic voltages. And can be used in measurement technology.

The purpose of the invention is to improve the accuracy of the conversion.

Figure 1 shows a functional diagram of the device, Fig, 2 - diagrams of operation of the device;

The device contains the first 1 and second 2 amplitude-pulse modulators, the first 3 and second 4 comparators, the generator 5 triangular voltage, the adder 6, the first 7, the second 8, the third 9 and the fourth 10 limiters, demodulator 11, the second filter 12, first 13 and second 14 pulse shapers, trigger 15, third 16 and fourth 17 pulse shapers 16 and 17, two-wave rectifier 18, first filter 19, integrator 20, sampling-storage unit 21, first 22 and second 23 information inputs, the first 24 and second 25 inputs of the reference voltage, p rvy 26 and second 27 inputs of the device. The outputs of the first 1 and second 2 amplitude-pulse modulators are connected to the inputs of the adder 6, the first inputs of the first 1 and second 2 amplitude-pulse modulators are connected to the first 22 and second 23 information inputs of the device. The first inputs of the first 3 and second 4 comparators are connected to the first 24 and second 25 inputs of the device's reference voltages. The outputs of the first 3 and second 4 Comparators are connected to

control inputs of the first 1 and second 2 amplitude-pulse modulators. The output of the generator 5 triangular voltage is connected to the second inputs of the first 3 and second 4 comparators and the input of the first limiter 7, the output of which is connected to the control input of the demodulator 11, whose input is connected to the output of the adder 6, the output of the demodulator 11 is connected to the input The second filter 12, the output of which is connected to the inputs of the full-wave rectifier 18 and the fourth limiter 10, the first input of the first comparator 3 is connected to the input of the second limiter 8, the first input of the second comparator 4 - with the third limit Telem 9, the second restrictive Vkod

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The bodies 8 are connected to the input of the first driver I3 pulses, the output of the third limiter 9 - to the input of the second driver 14 pulses, the outputs of the first 13 and second 14 pulse drivers - to the trigger inputs 15, the Inverse output of the trigger 15 is connected to the input of the third driver 16 pulses, my trigger output 15 is connected to the input of integrator 20, the reset input of which is connected to the output of the third pulse generator 16,. The output of integrator 20 is connected to the input of sampling-storage unit 21. The output of the fourth limiter 10 is connected to the input of the fourth pulse generator 1 7, the output of which is connected to the control input of the sampling-storage unit 21. The output of the two-period rectifier 1 of ITALIAN 18 is connected to the input of the first filter 19, the output of which is connected to the first output 26. The output of the sampling-storage unit 21 is connected to the second output 27 of the device. : The coordinate converter works as follows

Slowly varying signals from the first 22 and second 23 information inputs go to the first 1 and second 2 pulse-amplitude modulators. At the outputs of the first 3 and second 4 comparators, which execute the function of pulse-width modulators, pulse signals are formed, the width of which is obtained by exposure to a signal from an output, a generator of a triangular high-frequency voltage 5, signals from the first input 25 of the reference voltage and shifted by 90 signal from the second input 24 of the reference voltage (FIGo2a: 1 - voltage from the first input of the reference voltage 24; 2 - voltage from the second input of the reference voltage 25; 3 - generator voltage 5 ,, de- coal strain high frequency. From the outputs of the nepBOi o 3 and the second 4 comparators, signals with a latitude modulation are fed to the control inputs of the first 1 and second 2 amplitude-pulse modulators. On the z-strokes of the first 1 and second 2 amplitude-pulse modulators 1 and 2 As a result, signals with latitude modulation are formed, the amplitude of the pulses of which is determined by the signals from the first 22 and second 23 information inputs (Fig. 26, c).

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The output signals of the first O 1 and second, and second 2 pulse-amplitude modulators 1 and 2 are summed in adder 6 (Fig. 2d). The output signal of the adder 6 is subjected to a phase-sensitive detection in demodulator 11, to the control input of which rectangular periodic pulses are received, obtained in the first limiter 7 from a triangular voltage of high frequency. At the output of the second filter 12, which does not transmit the high-frequency components of the generator of the triangular high-frequency voltage generator 5, a sinusoidal voltage is formed with a frequency of the low-frequency reference voltage (Fig. 2d, sinusoidal curve). The output of the second filter 12 is rectified in full-wave rectifier 18 and filtered by filter 19, which does not transmit low frequency components, the output of which produces a signal proportional to the module of the geometric sum of two slowly varying input signals. The signals from the first 24 and second 25 inputs of the reference voltage are limited, respectively, in the second 8 and third 9 limiters (Fig. 2e, e). The first 13 and second 14 pulse shapers use the front (e.g., positive) fronts of the rectangular output pulses of the second 8 and third 9 limiters to control the trigger 15. At the direct output of trigger 15 as a result of the formation of pulses (Figs, 2i), the duration of which corresponds to the phase shift between the signals of the reference voltage. From the output of the trigger 15, the signal is fed to the input of the integrator 20, at the output of which sawtooth voltage pulses are generated (Fig. 2). At the end of each pulse from the trigger 15, the integrator 20 is reset to the initial state by the output signal of the third pulse generator 16, which uses the leading edge of the signal from the inverse output of the trigger 15. The signal from the output of the integrator 20 is fed to the input of the 21-sample-storage unit, in which The sawtooth signal is sampled at the time of the signal at the control input of the sampling-storage unit 21. The control signal in time corresponds to the moment of transition through

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zero signal of the second filter 12 (fig. 2d sine wave curve). This signal is limited by the fourth limiter 10 (fig.2g) from the leading edge of the limited signal by the fourth driver 17 pulse-. A pulsed signal is formed (Fig. 2k), which is fed to the control input of the sampling-storage unit 21. In sampling-storage unit 21, a sampling of sawtooth voltage occurs (Fig. 2L). The magnitude of the voltage of this sample is proportional to the phase shift between the reference signal from the first output 24 (Fig. 2a, curve 1) and the output signal of the second filter 12, which is the geometric input of slowly varying signals, i.e. At the second output 27, there is a voltage proportional to the three phase shift.

Claims (1)

1. t t t t F1, .2.