SU849101A1 - Complex value comparison device - Google Patents

Description

one

The invention relates to electrical engineering and can be used in devices for tolerance control of impedance parameters, bridges and alternators of alternating current.

The quasi detector is known: equilibrium, containing two matching devices, the outputs of which, respectively, are connected via the first and second full-wave rectifiers to the corresponding inputs of the subtractor unit, the output of which is connected to the integrator signal input, the output of which is connected: n to the signal input of the comparison unit , the control inputs of the integrator and the comparison unit are connected to the output of the time of the master unit.

However, the known detector sprays the moduli of two harmonic frequency signals, but it does not allow the in-phase and quadrature components of these signals to be compared. Besides.

Therefore, the signal at the output of the detector has an analog form, which requires additional analog-digital conversion in the case of extrapolating formation of regulatory influences in the measuring circuit.

The closest in technical essence are devices containing a sinusoidal voltage generator, the first and second outputs of which are connected, respectively, through a pulse shaper to one of the control inputs of the key and through the primary measuring transducer to one which is connected to the second control input of the key, the pulse generator is connected via a key to the ring pulse counter, the first. the output of which is connected via a compensating voltage generator to the second input of the zero-organ, and the second output is connected to the input of the digital indicator G 23. In the known device, the compensating voltage generator is started again in each cycle, balancing. The measured component will be proportional to the time, the interval from the beginning of the last sweep to the nearest extremum of the reference signal. As a result, the known device has insufficient speed. The measurement time can be from one to hundreds of periods of the measured voltage and depends on its amplitude, phase angle and error resulting from incomplete leveling. The purpose of the invention is to increase the speed. The goal is achieved by the fact that in the comparison device there are complex values containing a zero-body, one input of which is connected: H to the first bus., The second input is connected to the output of the voltage compensating generator, a pulse counter, a key and a pulse shaper, the input of which is connected to the second the input bus, and one output is connected to the first key input, an amplitude converter is inserted between the second input bus and the second key input, the output of which is connected to the first input of the compensating voltage generator , A second input coupled to an output zero body and the first input of the pulse counter, the second input of which is connected to the second output of the pulse shaper. Moreover, the compensating voltage generator contains a series-connected integrator and a controlled voltage divider, the control input of which is connected to the second input of the voltage compensating generator. In addition, the compensating voltage generator contains a controlled integrator and voltage divider, the first inputs of which connected to the first input of the generator of the voltage generator, the second input of the controlled voltage divider is connected to the second input of the compensator voltage generator, and the control input A control integrator is connected to the output of a controllable voltage divider. FIG. I shows a block diagram of a device for comparing complex orders; in figs 2 and. 3 is a block diagram of two variants of a compensating voltage generator; in fig. 4 shows timing diagrams explaining the operation of a device for comparing complex values. A device for comparing complex values contains an amplitude converter 1, a pulse shaper 2, a switch 3, a compensating voltage generator 4, a zero-organ 5, a counter 6, input buses 7 and 8, an output bus 9, a compensating voltage generator 4 for the variants in FIG. 2 and 3 consists of integrators 10 and 11 and controlled voltage dividers I2 and 13, respectively, signal bus 14 and control bus 15. A device for comparing complex values works as follows. One of the compared harmonic signals, for example, and (FIG. 4a) is fed to the device input bus 7, i.e., to the first input of the zero-body 5. The second harmonic signal U2 (FIG. 4a) is fed to the device input bus 8, those. at the same time to the inputs of the amplitude Converter 1 and the driver 2 pulses. From the first EXIT of the driver, 2 pulses arrive at the control key 3, rectangular pulses (Fig. 4c) whose beginnings coincide with the moments when the harmonic signal U passes through the zero level from minus to plus or from plus to minus, and the endpoints coincide with the moments respectively, positive or negative extrema of the signal U, j. From the output of the amplitude converter 1, the reference signal UQP (Fig. 4) of a constant level, equal to the amplitude of the input signal, via the switch 3 is fed to the signal bus 14 of the compensating voltage generator 4. When performing the compensating voltage generator 4 according to the scheme of FIG. 2, rectangular pulses (Fig. 4c) from the output of the switch 3 are fed to the input of the integrator 10, a linearly increasing signal Ug (Fig. 4e) from the output of which is fed through the controlled voltage divider I2 to the second input of the zero-organ 5- At the moment The equal-gwa of the first input signal C and the signal from (FIG. 4e) from the output of the controlled divider J 2 pulse (FIG. 4f) from the output of the zero of the organ 5 is fed to the counting input of the counter 6 and to the control bus 15 of the compensating voltage generator 4, those. to the control input of the controlled voltage divider 12, the signal and (Fig. 4e), the output of which is sharply reduced by the instantaneous value of the signal Ug (Fig. 4e) at this point in time, where n is a natural number determining the number discrete values of the comparison unit of complex values, and continues to grow linearly until the next pulse arrives from the output of the null organ 5, i.e. until the next moment of equality with ignal TS.

When performing the compensating voltage generator 4 as shown in FIG. 3, the rectangular pulses (Fig. 4d) c of the output of the key 3 are received simultaneously via the signal bus 14 to the inputs of the controlled voltage divider 13 and the integrator 11, a linearly rising signal, FIG. 4c |) from the output of which enters the second input of the zero-body 5. At the moment of equality of the first input signal U and the signal VeSefig. 4 d) a narrow pulse (Fig. 4 g) from the output of the nullorgan 5 is fed to the counting input of the counter 6 and to the control bus 15 of the generator 4 of the compensating voltage, i.e. The control input of the voltage divider 13 signal (Fig. 4h) at the output of which varies from the zero level by the value (-) of the reference signal Id (Fig. 4a) with the arrival of each pulse (lg 4 i) from the Zero output 5. The signal (Fig. 4h) from the output of the controlled voltage divider 13 is fed to the control input of the integrator 11, which is the input of setting its initial conditions and determines the magnitude of its output signal shift Uc (Fig. 4a) relative to zero.

Narrowing pulses (Fig. 4c) are sent to the control gate of the counter 6 at the instants of the extremum of the signal Ui from the second output of the driver 2 pulses. At the moments of the pulses the count stops and the readings are removed from the counter 6.

The integrators 10 and 11 are adjusted so that linearly increasing, the signal Ug (Fig. 4 e and 4 d) for a quarter of the period reaches the value of the reference signal UQ, i.e., the amplitude of the output signal and (Fig. 4a). By the time the sweep begins, counter 6 records the indicated number n, and, with the arrival of k pulses, is recorded (Fig. 4)

to its counting input, the recorded value becomes (n − k), where k is the number of moments of equality of the linearly varying signal from the output of generator 4 of the compensating voltage to the input signal U,. From the time diagrams (figs. 4e, and 4e) it can be seen that the number (n-k) shows how much of the signal Ui is the in-phase component of the signal C

The proposed device can operate both in bridges and compensators, and in converters of parameters of complex values into a digital code. In this case, a signal from the primary measuring transducer is supplied to its input bus 7 (for example, based on a feedback amplifier), and the input bus 8 is a reference signal from the field voltage generator.

Claims (3)

1. Comparison device of complex values, containing a null-organ, one input-which is connected to the first input bus, the second input is connected to the output of the compensating voltage generator, a pulse counter, a key and a driver of the pulses, whose input is connected to the second input bus, and one output is connected to the first input of the key, which is sent to it so that, in order to increase speed, an amplitude preamplifier is inserted into it. wcJ: juiced between the second input bus and the second input of the bus ;, the output of which is connected to the first input of the compensating voltage generator, the second input of which is connected to the output of the zero-organ and the first input of the pulse counter, the second input of which is connected to the second output of the pulse former. 2. A device according to claim I, characterized in that the compensating voltage generator comprises a series-connected integrator and a controlled voltage divider, the control input of which is connected to the second generator input compensating for 1 voltage. 3. The device according to claim 1 is that the compensating voltage generator contains a controlled integrator and a voltage divider, the first inputs of which are connected to the first input of the compensating voltage generator, the second LHOD of the controlled voltage divider, and the second connecting the input of the compensating voltage generator, and the control output of the controlled integrator is connected to the output of the controlled voltage divider. 84 18 Sources of information taken into account in the examination, I. USSR Author's Certificate number 387330, cl. G 05 B 1/01, 06.21.73. 2. USSR author's certificate number 521522 Cl. G 01 R 17/06, 18.03.75 (prototype). Put.2 CuiH.h. P / V- /five Fig.Z