SU1056151A1 - Voltage calibrator - Google Patents

Abstract

VOLTAGE CALIBRATOR, the content of the reference voltage, to which the key is connected is the integrator, the output of which is connected — the fixer urgovn, linear detector, connected to the integrator's input — the control unit, corresponding to the output outputs of which are connected to the control inputs of the integrator — and a controlled generator, and the input of the control unit is connected to the first input terminal, which differs in that, in order to expand its functionality, a block of meters is entered into it, a block of The unit is equipped with a digital analog conversion unit, the meter unit is connected between the output of the controlled generator and the first input of the memory unit, and the control input of the meter unit is connected to the corresponding output of the control unit, the second input of the memory unit is connected to the second input terminal, and the outputs are connected to the corresponding input the control inputs of the block, the digital-to-analog (L transform, the input of which is connected to the output of the level lock and the outputs to the corresponding output pins, while the output of the key is connected introducing additional entry integrator and vhots linear detector coupled to the first output terminal ate. 05

Description

The invention relates to electrical engineering, in particular, to variable voltage calibration calibrators, and can be used in the construction of information-measuring systems and systems for automatic monitoring and control. A voltage calibrator is known, which contains a coherent generator, a control element, a reference voltage source, a differential comparator, and an amplifier. This device is a combination of a master generator and an AC voltage regulator. The output voltage in these devices is stabilized (independent of the voltage fluctuations of the master oscillator), and its value is controlled by the voltage value of the reference source G1 l. The disadvantage is that it is impossible to use this device, if it is necessary to set the output alternating voltage with a specified and easily controlled spectrum, as well as to specify a set of output voltages that are the harmonic components of the pre-specified spectrum. The closest to the invention to the technical essence is a voltage calibrator containing a voltage onopioro source, to the output of which a key input is connected, an integrator, to the output of which is connected a level lock, a linear detector, an output connected to the integrator input, the control unit corresponding outputs of which connected to the control input of the key, latch and controlled generator, and the input of the control unit is connected to the first input terminal tS. The signal spectrum of this device is associated with its shape. The waveform is created in a controlled oscillator. The practical possibilities of creating signals of complex shape are largely limited with an increase in signal complexity (which requires the complication of a given signal spectrum). To obtain a set of voltages that represent the harmonic components of the signal with a predated spectrum, and it is easy to rebuild the relations between the amplitudes of the harmonic components, as well as their phase shifts, it is impossible to limit the functional capabilities of the known device. The aim of the invention is to enhance the functionality of the voltage calibrator. The goal is achieved by the fact that the voltage calibrator containing the source of the reference voltage, the output of which is connected to a key input, the integrator, the output of which is connected to a fixed level, a linear detector, an output connected to the input of the integrator, a control unit, the corresponding outputs of which are connected to the control inputs of the key, latch and controlled generator, and the input of the block is connected to the first input pin, a block of counters, a memory block and a digital-analog conversion unit are inserted, the block the meters are connected between the i output of the controlled generator and the first input of the storage unit, and the control input of the counter of meters is connected to the corresponding output of the control unit, the second input of the memory unit is connected to the second input terminal, and the outputs of the corresponding control inputs digital-to-analogue conversion, the input of which is connected to the output of the latch and the outputs are connected to the corresponding output pins, while the output of the key is connected to the gain of the auxiliary input of the integrator, and the input of the linear input a detector coupled to the first output terminal. FIG. Figure 1 shows the structure of the proposed voltage calibrator; in fig. 2 is an example of posting a control device. The device contains a source of reference voltage 1, to the output of which a switch 2 is connected, an integrator 3, to the output of which a latch 4 is connected, a linear detector 5 connected to the integrator 3, a control unit 6 connected to the switch. 2, to the clamp 4 level and to, the first input terminal, the controlled generator 7, connected to the control unit 6, the unit. 8 counters, connected to a controlled generator 7 and a control unit 6, a memory unit 9 connected to the output of a block of 8 meters and a second input terminal, a digital-analog conversion unit 10 connected to the output 4 of the 1x converter 4, to the device outputs n to the unit output 9, the key 2 is connected to the integrator 3. The input of the linear detector 5 is connected to the pin output. The controlled oscillator 7 contains a pulse clock generator and a controlled frequency healer 12. The memory unit 9 contains storage units 13, the digital-to-analog conversion I bit 10 contains digital-to-analog converters 14, the control unit 6 contains the code converter 15 connected in series into the time interval, the counter 16 nm pulses and the decoder 17, and the converter 18 moves. JBxpa turned 31 “atelo 15 code in time | mval and hopp; I am the consignor of the IS Aoasypbak campus to the entrance of the 6 ynpasneaia block, which is an excellent output. The outputs are converted by bodies 1 into codes connected to a block of 8 counters, to a generator of 11 clock pulses, and to a controlled frequency divider 12. The input of the counter 16 pulses is connected to the gene TORT 11 clock pulses. The output of the code converter in the time interval is connected to the key 2, and the output of the decoder 17 to the input of the latch 4 level. The reference voltage source is a stabilized DC voltage source, which is connected to the input of the integrator 3 via switch 2 when the control signal (time interval) T comes from the control unit 6 to the control input of the latter. The latch 4 is a dynamic memory device (storage circuit), which selects and stores the output voltage of the integrator 3 (leveling) at the moment of arrival of the short control pulse l from the pack. gov. Linear detector 5 (its role can perform depending on the requirements of a particular application, a single-phase two-component rectifier, an amplitude detector, a detector of average or effective voltage values) converts the output of aaoro voltage of a variable voltage into a constant or pulsating voltage. input to the integrator. The structure of linear detector 5 and integrator 3 is such that the change in voltage at the output of integrator 5 as a result of integrating the voltage Eg from the legal source 1 is opposite in sign to the change in the integration of the output voltage of the linear detector 5 as a result of integration of the controlled generator 7 clock pulses whose frequency can be set by the control signal from control unit 6. Q is a controlled frequency healer 12, the division factor of which can also be set by a signal from the control unit. The block 8 of counters is generally a set of pulse counters, for example binary, whose initial preset is carried out by a signal from the control unit 6. The storage unit 9 is a set of recording devices 13 whose role can be executed by a fixed, permanent or reprogrammable memory. devices. Device 13 and 13 generally have two groups of main inputs - limit selection inputs (this group of inputs is connected to unit 8 of the meters) and information recording inputs c. memory cells (in the case of post-day storage devices, this group of inputs is absent). Koi is installed at the inputs of the memory devices 13. according to the contents of the memory cells selected by the address code. The D / A conversion block contains a set of multiplying pyrex analog conversion gels 14 having a similar input to which a voltage is applied, and a group of digital codes to which a code is fed, for example, a parallel binary code. At the output of each digital-to-analog converter 14, a voltage is set that is proportional to the product of the input voltages and code. To the input unit 6 controls. which is the first input terminal, the tsignal (for example, the code) of the control (setting) of the output voltage, frequency and phase shift of the output voltage of the voltage calibrator. The code converter 15 in the time interval forms a control pulse, the duration of which is proportional to the code setting the output voltage of the calibrator. The pulse counter 16 counts the pulses from the clock pulse generator. The decoder 17 forms a short sampling pulse for the latch 4 level. A code converter 18 converts the input frequency setting and phase shift settings into a control code for a block of 8 meters, a clock pulse generator 11, and a controlled frequency divider 12 (i.e., performs the role of an interface converts, for example, a number-pulse or binary - The primary code is pavoichny). Calibrator operates cyclically. The cycles are detected by the sampling pulses TL generated by the control unit 6 and fed to the latch L of the level. During each cycle, the control unit generates one time interval T, which opens the key 2. The time interval depends on the input signal, for example, coming to the input of the control unit 6. The pulse counters of the block 8 of the counters count the pulses from the output of the controlled oscillator 7. The output code of each counter of the block 8 is changed, resulting in the polling of the addresses of the cells of the storage devices 10, the outputs of which sequentially appear ti. The set of codes stored in the memory cells of each storage device 13 represents the value set of the piecewise-step-approximated curve. At the outputs of the digital-to-analog converters 14 of the block 10 of the digital-to-analog pre-image, thus, voltage variables are formed. The instantaneous values of these voltages are the ordinates of the steps of piecewise-step-approximated curves, proportional to the product of the input voltage of the digital-to-analog converters 14 and the corresponding input code. The work cycle of the calibrator is equal to or a multiple of the alternating voltage period at the output connected to the input of the linear detector 5. It should be noted that, in the general case, the voltage at any of the outputs of the calibrator may be constant. For this, the contents of the corresponding storage device 13 must be such that when it is cyclically polled at all addresses, its output code remains unchanged. After the expiration of n cycle of operation, the average value of the output voltage of the calibrator at the output connected to the linear detector 5 (this output will be the first) will be equal to -d-fl) and ysro 1ВЬ1Х Cf n - cycle time, i.e. the period of impulses for the elections ki is the average value of the considered output voltage of the output voltage before the first cycle of operation; "K at FU and K .." „- transfer coefficients of latch 4 level and digital-analog converter 14, respectively; timing elements of the integrator 3. From (1) it can be seen that when the condition IQI 1 is satisfied with a sufficiently large n (i.e. in the steady state), the average value of the output voltage will become i. 1 bb1x Cp from -j This expression represents the transformation equation of the calibrator for its first output. In this case, if the time interval T is formed in proportion to the input signal (for example, code), then the output voltage at the first output is calibrated by the input signal at an average value. At the same time, the transfer equation does not include the transfer factor of such blocks as integrator 3, latch 4 and digital to analog converter 14 connected to the first voltage calibrator, which allows for relatively long-term stability and linearity of transfer coefficients of these locks to obtain the output voltage at the first output with a sufficiently high accuracy. The transformation equation of the calibrator for each of the other outputs, i.e. on the i -th output 2, p) has the form ML 1 Bfaix cf the instantaneous value of the voltage at the i -th output ;. K and K -. (Transfer coefficients of digital-analog converter 14, respectively, under; key to the output (J, and (Jj; gj ,,; numbers (codes) received at the digital inputs of the corresponding digital-analog converters) 14. Thus, the proposed voltage calibrator generates a series of voltages at n outputs. The voltage at the first output I. is stabilized (calibrated) at the average value. The instantaneous values of the voltage at all the other outputs are Ug yi ,,, ..., -nb (X are stabilized relative to the average voltage values lebrx Form and frequency of voltage At each of the outputs, the frequency of each voltage is set by setting the reference frequency of the clock generator 11, the transfer factor of the controlled frequency healer 12, and the structure of the block 8 of the counters. Phase saves of all voltages are set by resetting the corresponding pulse counter of the block 8 of the counters to a predetermined state or using the codes of the storage DEVICES 13 BLAGOR L. ,, - L - ::: rM. .t--. J IV IVJ all the output voltages on a simple analog adder, it is possible to obtain an alternating voltage of complex shape, which is given a form, or harmonic factor, or spectrum, taking into account both the amplitudes of the harmonics and their phases .. As a result, The proposed calibrator is rather wide because it can be used 2 in the following cases: as a DC voltage calibrator; a calibrator of alternating voltage of a sinusoidal or layer ;;. form (as a measuring signal generator, for example, for calibrating or calibrating voltmeters,. of non-linear distortion meters or tsy devices); a calibrator of alternating voltage of complex shape with a given spectrum and stabilized by the first harmonic (as a source of a calibration signal, for example, for calibrating or calibrating spectrum analyzers or selective voltmeters); a calibrator of two alternating voltages with a given phase shift, amplitude and shape of the base shift, amplitude and shape of the primary signal, for example, for p-junction or phase-sensitive voltmet. All input units are simple, produced in microelectronic design, reliable, co-efficient. The proposed calibrator is easily automated, which makes it applicable to automated measurement, control, or control systems. At the same time, when comparing simplicity, the calibrator is quite high-precision.

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Claims (1)

. VOLTAGE CALIBRATOR, containing a reference voltage source, to the output of which a key input is connected, an integrator, to the output of which a level lock is connected, a linear detector connected to an integrator input ·, a control unit, the corresponding outputs of which are connected to the control inputs of the key, level lock and controlled generator, and the input of the control unit is connected to the first input output. distinguished by the fact that, in order to expand the functionality, a counter block, a memory block, and a block are introduced into it an analog-to-analogue conversion, with the counter unit connected between the output of the controlled generator and the first input of the storage unit, and the control input of the counter unit connected to the corresponding output of the control unit, the second input of the storage unit connected to the second input output, and the outputs to the corresponding control inputs of the unit, digital-to-analog conversion . the input of which is connected to the output of the level lock, and the outputs are connected to the corresponding output terminals, while the key output is connected to the introduced additional input of the integrator, and the input of the linear detector is connected to the first output output.