CN106483489B - Calibrating device of mutual-inductor check gauge based on detection feedback - Google Patents
Calibrating device of mutual-inductor check gauge based on detection feedback Download PDFInfo
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- CN106483489B CN106483489B CN201611018942.8A CN201611018942A CN106483489B CN 106483489 B CN106483489 B CN 106483489B CN 201611018942 A CN201611018942 A CN 201611018942A CN 106483489 B CN106483489 B CN 106483489B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The invention discloses a verification device of a transformer calibrator based on detection feedback, which comprises: the system comprises a man-machine interaction circuit, a data processing circuit, a central execution circuit, a sampling analog-to-digital conversion circuit, a digital-to-analog conversion circuit and a power amplifier circuit; the man-machine interaction circuit is connected with the data processing circuit; the data processing circuit is connected with the central execution circuit; the central execution circuit is connected with the digital-to-analog conversion circuit; the digital-to-analog conversion circuit is connected with the power amplifier circuit; the power amplifier circuit is connected with the sampling analog-to-digital conversion circuit; the sampling analog-to-digital conversion circuit is connected with the central execution circuit. The verification device provided by the invention adopts four channels which are mutually independent, and the amplitude value and the phase relation between each channel adopt a microprocessor and the automatic control output of a central execution sub-circuit; and the device has the characteristics of high-precision verification, and improves the stability and the accuracy of the output signal of the verification transformer calibrator.
Description
Technical Field
The invention relates to the technical field of calibrating devices, in particular to a calibrating device of a transformer calibrator based on detection feedback.
Background
In an electric power system, an electric energy meter and a metering transformer are related to fair trade settlement of all electricity customers and electricity distribution enterprises, and a transformer calibrator is a key detection instrument used in the calibration process of the metering transformer, and is required to be calibrated by adopting a transformer calibrator for calibrating accuracy and key technical indexes.
At present, the existing calibrating device is composed of standard components such as a transformer, a standard resistor, a standard capacitor and the like, and a standard ratio power supply formed by adding corresponding power supplies, and can output standard ratios such as current to current delta I/I, voltage to voltage delta U/U, voltage to current delta U/I, current to voltage delta I/U and the like, and is specially used for calibrating a transformer calibrator. The output of the voltage regulator transformer is manually regulated, the output voltage outputs standard voltage and current signals of 100V or 5A and the like through a current booster or a voltage booster, the standard voltage or standard current signals then generate small current signals or small voltage signals in a mode of carrying a standard load (standard resistor and standard capacitor), and finally the standard ratio is output to verify the transformer calibrator.
However, the existing calibrating device adopts a phase-shifting sub-circuit to generate quadrature component signals, an operational amplifier, a resistor and a capacitor are needed to be used in the sub-circuit, and the capacitor is the device which is most easy to change, so that the output accuracy and linearity of a difference voltage or a difference current signal can be greatly influenced, and the accuracy and stability of the device are not easy to guarantee; and the manual adjustment mode is needed to operate, the degree of automation is not high, and a large amount of work is caused for operators.
Disclosure of Invention
The invention aims to provide a verification device of a transformer calibrator based on detection feedback, which aims to solve the problems of low automation degree, poor stability and inaccurate verification result when the existing verification device is used for verifying the transformer calibrator.
According to an embodiment of the present invention, there is provided an assay device for a transformer calibrator based on detection feedback, including: the system comprises a man-machine interaction circuit, a data processing circuit, a central execution circuit, a digital-to-analog conversion circuit, a power amplifier circuit and a sampling analog-to-digital conversion circuit, wherein,
the output end of the man-machine interaction circuit is connected with the input end of the data processing circuit;
the output end of the data processing circuit is connected with one input end of the central execution circuit;
the output end of the central execution circuit is connected with the input end of the digital-to-analog conversion circuit;
the output end of the digital-to-analog conversion circuit is connected with the input end of the power amplifier circuit;
the output end of the power amplifier circuit is connected with the input end of the sampling analog-to-digital conversion circuit;
the output end of the sampling analog-to-digital conversion circuit is connected with the other input end of the central execution circuit;
The man-machine interaction circuit is used for outputting four groups of data list signals of the transformer calibrator; the four sets of data list signals include a voltage signal, a current signal, a differential voltage signal, and a differential current signal;
the data processing circuit is used for processing the four groups of data list signals to obtain the relation between the amplitude values and the phases of the four groups of data list signals;
the central execution circuit is used for carrying out automatic operation according to the amplitude value and sending the result of the automatic operation to the digital-to-analog conversion circuit according to the phase relation;
the central execution circuit is used for carrying out automatic operation according to the amplitude value and sending the result of the automatic operation to the digital-to-analog conversion circuit according to the phase relation;
the power amplifier circuit is used for carrying out power amplification processing on the analog quantity signal and sending the analog quantity signal to the sampling analog-to-digital conversion circuit;
the sampling analog-to-digital conversion circuit is used for collecting the analog quantity signals after the amplification processing, boosting, current rising and difference value checking the analog quantity signals according to the amplitude values to obtain output results, and sending the output results to the central execution circuit; the output result comprises a detection voltage value, a detection current value, a detection difference voltage value and a detection difference current value;
The central execution circuit is further used for sending the output result to the data processing circuit;
the data processing circuit is also used for verifying the output result according to a preset value and performing negative feedback adjustment to obtain a standard output result; the standard output result comprises a standard voltage value, a standard current value, a standard deviation voltage value and a standard deviation current value.
Preferably, the data processing circuit comprises: the microprocessor is connected with the man-machine interaction circuit;
the microprocessor is used for acquiring the four groups of data list signals and processing the four groups of data list signals to obtain the relation between the amplitude values and the phases of the four groups of data list signals;
the microprocessor is also used for controlling the central execution circuit to independently adjust the amplitude value and the phase relation, checking according to a preset value, and performing negative feedback adjustment on the output result to obtain a standard output result;
the communication input interface is used for transmitting the four groups of data list signals between the microprocessor and the man-machine interaction circuit.
Preferably, the central execution circuit includes: a central execution sub-circuit, a timing counter sub-circuit, a memory and a programmable device sub-circuit;
The central execution subcircuit is connected with the microprocessor;
the time sequence number sub-circuit, the memory and the programmable device sub-circuit are respectively connected with the central execution sub-circuit;
the memory is used for storing the four groups of data list signals and the output result;
the programmable device sub-circuit is used for carrying out automatic operation according to the amplitude value to obtain an automatic operation result;
the timing subsystem is configured to provide a timing relationship for the central execution circuit and the digital-to-analog conversion circuit.
Preferably, the digital-to-analog conversion circuit includes: a DC-AC conversion sub-circuit, an AC-DC conversion sub-circuit and a range switching sub-circuit;
the input end of the direct current-alternating current conversion sub-circuit, the output end of the alternating current-direct current conversion sub-circuit and the input end of the range switching sub-circuit are respectively connected with the output end of the central execution circuit;
the output end of the direct current-alternating current conversion sub-circuit and the input end of the alternating current-direct current conversion sub-circuit are respectively connected with one power amplifier circuit;
the output end of the range switching sub-circuit is respectively connected with the input end of the power amplifier circuit and the input end of the sampling analog-to-digital conversion circuit;
The direct current-alternating current conversion sub-circuit is used for converting the result of the automatic operation of the central execution circuit into an analog quantity signal;
the alternating current-direct current conversion sub-circuit is used for measuring the output result of the sampling analog-to-digital conversion circuit after the power amplifier circuit operation buffer treatment and sending the output result to the central execution circuit;
the range switching sub-circuit is used for sending out a control signal, and the power amplifier circuit and the sampling analog-to-digital conversion circuit are controlled to output a result according to the switching range by automatically adjusting the switching range.
Preferably, the power amplifier circuit includes: a plurality of power amplifier sub-circuits and a plurality of amplifying buffer sub-circuits;
each power amplifier sub-circuit is connected with the direct current-alternating current conversion sub-circuit respectively; one end of each amplifying buffer sub-circuit is connected with the alternating current-direct current conversion sub-circuit respectively, and the other end of each amplifying buffer sub-circuit is connected with the range switching sub-circuit respectively;
the power amplification sub-circuit is used for carrying out power amplification processing on the analog quantity signal and sending the analog quantity signal to the sampling analog-to-digital conversion circuit;
the amplifying buffer sub-circuit is used for receiving the control signal of the range switching sub-circuit, obtaining an output signal through switching the range, and sending the output signal to the alternating current-direct current conversion sub-circuit.
Preferably, the sampling analog-to-digital conversion circuit includes: the device comprises a precision voltage transformer, a precision current transformer, a plurality of isolation boosters, a plurality of isolation up-converters and a plurality of voltage division sampling resistors;
each isolation booster is respectively connected with one voltage division sampling resistor;
each isolation current booster is connected with one voltage division sampling resistor respectively;
the precise voltage transformer is connected with the isolation booster through the voltage division sampling resistor;
the precise current transformer is connected with the isolation current booster through the voltage division sampling resistor;
the isolation booster is used for receiving the analog quantity signal, forming a standard alternating current constant voltage source with the power amplifier sub-circuit, and outputting the detection voltage value;
the isolation current booster is used for receiving the analog quantity signal, forming a standard alternating current constant current source with the power amplifier sub-circuit, and outputting the detection current value;
the precision voltage transformer is used for receiving the control signal of the range switching subcircuit and outputting the detection difference voltage value;
the precision current transformer is used for receiving the control signal of the range switching subcircuit and outputting the detection difference current value.
Preferably, the man-machine interaction circuit comprises: the device comprises a controller, a keyboard, a display screen and a communication output interface; the keyboard, the display screen and the communication output interface are respectively connected with one end of the controller, and the other end of the controller is connected with the microprocessor;
the display screen is used for displaying the output result and the standard output result;
the communication output interface is used for being connected with the communication input interface of the data processing circuit and outputting the four groups of data list signals;
the keyboard is used for inputting instructions;
the controller is used for controlling the display screen to display, controlling the communication output interface to output signals and receiving instructions input by the keyboard.
Preferably, the apparatus further comprises: and the switching power supply circuit is connected with the power amplifier circuit and is used for supplying power to the power amplifier circuit.
Preferably, the ac-dc conversion sub-circuit is a successive approximation type analog-to-digital converter; the direct current-alternating current conversion sub-circuit is a high-precision type digital converter.
Preferably, the adjusting range of the isolation booster is 10% -120%; the adjusting range of the isolation current booster is 1% -150%.
As can be seen from the above technical solutions, the embodiment of the present invention provides a verification device for a transformer calibrator based on detection feedback, including: the system comprises a man-machine interaction circuit, a data processing circuit, a central execution circuit, a sampling analog-to-digital conversion circuit, a digital-to-analog conversion circuit and a power amplifier circuit, wherein the output end of the man-machine interaction circuit is connected with the input end of the data processing circuit; the output end of the data processing circuit is connected with one input end of the central execution circuit; the output end of the central execution circuit is connected with the input end of the digital-to-analog conversion circuit; the output end of the digital-to-analog conversion circuit is connected with the input end of the power amplifier circuit; the output end of the power amplifier circuit is connected with the input end of the sampling analog-to-digital conversion circuit; the output end of the sampling analog-to-digital conversion circuit is connected with the other input end of the central execution circuit. According to the verification device provided by the invention, four groups of data list signals of the detected transformer calibrator, namely a voltage signal, a current signal, a difference voltage signal and a difference current signal, are obtained through a man-machine interaction circuit, and the amplitude values and the phase relations of the four groups of data list signals are obtained through processing of a data processing circuit; the amplitude values of the four groups of data list signals are sent to digital-to-analog conversion circuits of different channels through a central execution circuit according to the phase relation to obtain four groups of different analog quantity signals, the four groups of analog quantity signals enter different power amplification sub-circuits to be subjected to power amplification processing, the sampling analog-to-digital conversion circuits are used for collecting the signals, and the processed results are processed through an isolation booster, an isolation current booster, a precision voltage transformer and a precision current transformer according to the amplitude values; the data processing circuit performs verification according to the preset values and the four groups of values obtained after the processing, and further performs negative feedback detection and adjustment so as to accurately adjust the detected transformer calibrator, and judges whether the detected values meet the requirement of the use precision of the transformer calibrator or not so as to realize the accuracy of the output signals of the transformer calibrator. The verification device provided by the invention adopts four paths of channels which are mutually independent on a circuit and are formed by a direct current-alternating current conversion sub-circuit, a power amplifier sub-circuit, an isolation booster or an isolation current booster and a precision voltage transformer or a precision current transformer, wherein the amplitude value and the phase relation between each path of channels are processed by a microprocessor and the automatic control output of a central execution sub-circuit is adopted; and the automatic verification function is realized according to the preset calibration points, and the verification device provided by the invention has the advantages of less circuit links, simple circuit and effectively reduced failure rate. Therefore, the calibrating device provided by the invention has the characteristic of high-precision calibration, and can improve the stability and accuracy of the output signals of the calibrating instrument of the device calibrating transformer.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a block diagram of a verification device of a transformer calibrator based on detection feedback according to an embodiment of the present invention;
fig. 2 is a block diagram of an implementation scenario of an calibrating device of a transformer calibrator based on detection feedback according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an calibrating apparatus of a transformer calibrator based on detection feedback according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an implementation scenario of an calibrating device of a transformer calibrator based on detection feedback according to an embodiment of the present invention.
Illustration of:
the system comprises a 1-man-machine interaction circuit, a 101-controller, a 102-display screen, a 103-communication output interface, a 104-keyboard, a 2-data processing circuit, a 201-microprocessor, a 202-communication input interface, a 3-central execution circuit, a 301-central execution sub-circuit, a 302-memory, a 303-time sequence number sub-circuit, a 304-programmable device sub-circuit, a 4-digital-analog conversion circuit, a 401-direct current-alternating current conversion sub-circuit, a 402-alternating current-direct current conversion sub-circuit, a 403-range switching sub-circuit, a 5-power amplifier circuit, a 501-power amplifier sub-circuit, a 502-amplifying buffer sub-circuit, a 6-sampling analog-digital conversion circuit, a 601-isolation booster, a 602-isolation booster, a 603-voltage division sampling resistor, a 604-precision voltage transformer, a 605-precision current transformer and a 7-transformer calibrator.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 and 3, an calibrating apparatus for a transformer calibrator based on detection feedback according to an embodiment of the present invention includes: the human-computer interaction circuit 1, the data processing circuit 2, the central execution circuit 3, the sampling analog-to-digital conversion circuit 6, the digital-to-analog conversion circuit 4 and the power amplifier circuit 5, wherein,
the output end of the man-machine interaction circuit 1 is connected with the input end of the data processing circuit 2;
the man-machine interaction circuit 1 is used for outputting four groups of data list signals of the transformer calibrator 7; the four sets of data list signals include a voltage signal, a current signal, a difference voltage signal, and a difference current signal.
The four sets of data list signals can be sine wave signals or subharmonic signals; the four data list signals are independent signals, namely, the voltage signal, the current signal, the difference voltage signal and the difference current signal are not interfered with each other during signal transmission.
Specifically, the man-machine interaction circuit 1 includes: a controller 101, a keyboard 104, a display screen 102 and a communication output interface 103; the keyboard 104, the display screen 102 and the communication output interface 103 are respectively connected with one end of the controller 101, and the other end of the controller 101 is connected with the microprocessor 201;
the display screen 102 is configured to display the output result and a standard output result; the output result comprises a detection voltage value, a detection current value, a detection difference voltage value and a detection difference current value; the standard output result comprises a standard voltage value, a standard current value, a standard difference voltage value and a standard difference current value;
the communication output interface is configured to be connected to the communication input interface 202 of the data processing circuit 2, and output the four sets of data list signals;
the keyboard 104 is used for inputting instructions;
the controller 101 is configured to control the display screen 102 to display, control the communication output interface to output a signal, and receive an instruction input by the keyboard 104.
In practical use, referring to fig. 2 and 4, the calibrating device provided by the embodiment of the invention is connected with the transformer calibrator 7, that is, the power amplifier circuit 5 and the sampling analog-to-digital conversion circuit 6 are respectively connected with the transformer calibrator 7, and the calibrating device is used for detecting the use defect of the transformer calibrator 7 so as to adjust the accuracy of the output result of the transformer calibrator 7 and ensure the normal use of the transformer calibrator 7. During detection, a worker inputs related control instructions through the keyboard 104, the man-machine interaction circuit 1 can automatically work, namely the controller 101 acquires four groups of data list signals of the transformer calibrator 7, namely four paths of signals of the voltage signal, the current signal, the difference voltage signal and the difference current signal of the transformer calibrator 7, the four paths of signals are displayed through the display screen 102, and the controller 101 outputs the four groups of data list signals to the data processing circuit 2 through the communication output interface.
The output end of the data processing circuit 2 is connected with one input end of the central execution circuit 3;
the data processing circuit 2 is configured to process the four sets of data list signals to obtain an amplitude value and a phase relationship of the four sets of data list signals;
the data processing circuit 2 performs program calculation on the four sets of data list signals output by the transformer calibrator 7 to obtain the amplitude values and the phase relations of the four sets of data list signals, and stores the four sets of data list signals and the amplitude values and the phase relations thereof through the memory 302 of the central execution unit.
Specifically, the data processing circuit 2 includes: a microprocessor 201 and a communication input interface 202 connected with the microprocessor 201, wherein the microprocessor 201 is connected with the man-machine interaction circuit 1;
the microprocessor 201 is configured to acquire the four sets of data list signals, and process the four sets of data list signals to obtain an amplitude value and phase relationship of the four sets of data list signals;
the microprocessor 201 is further configured to control the central execution circuit 3 to independently adjust the amplitude value and the phase relationship, perform verification according to a preset value, and perform negative feedback adjustment on the output result to obtain a standard output result;
The communication input interface 202 is used for transmitting the four sets of data list signals between the microprocessor 201 and the man-machine interaction circuit 1.
The four sets of data list signals acquired by the man-machine interaction circuit 1 are transmitted to the microprocessor 201 through the communication input interface 202 of the data processing circuit 2, and the microprocessor 201 calculates the amplitude values and the phase relations of the four sets of data list signals, namely, the amplitude values and the phase relations of the voltage signals, the current signals, the difference voltage signals and the difference current signals.
The microprocessor 201 provided by the embodiment of the invention adopts STM32F205 with ARM architecture Cortex-M3 kernel, has abundant peripheral interfaces, has the processing speed of 120MHz, and is beneficial to reducing the system level cost of application. The microprocessor 201 can release the powerful performance of 150DMIP under 120MHz, and the flash memory of 1MB at most and the 128KB RAM can fully meet the design requirement of the verification device.
The present embodiment adopts the microprocessor 201 to calculate the digital signal generated by the sine wave signal as the reference of the dc-ac conversion; any periodic waveform can be generated, signals of 50Hz, 60Hz, 150Hz, 250Hz or other frequencies can be effectively realized, waveforms with multiple harmonic waves coexisted can be realized, and the harmonic suppression ratio function of the transformer calibrator 7 can be very easily realized.
The output end of the central execution circuit 3 is connected with the input end of the digital-to-analog conversion circuit;
wherein the central execution circuit 3 is configured to perform an automatic operation according to the amplitude value, and send a result of the automatic operation to the digital-to-analog conversion circuit 4 according to the phase relationship.
Specifically, the central execution circuit 3 includes: a central execution sub-circuit 301, a timing number sub-circuit 303, a memory 302, and a programmable device sub-circuit 304;
the central execution subcircuit 301 is connected with the microprocessor 201;
the timing sub-circuit 303, the memory 302, and the programmable device sub-circuit 304 are connected to the central execution sub-circuit 301, respectively;
the memory 302 is configured to store the four sets of data list signals and the output result;
the programmable device sub-circuit 304 is configured to perform an automatic operation according to the amplitude value, so as to obtain a result of the automatic operation;
the timing number sub-circuit 303 is used to provide timing relationships for the central execution circuit 3 and the digital-to-analog conversion circuit 4.
The central execution circuit 3 performs automatic operation on the four sets of data list signals according to the amplitude value calculated by the microprocessor 201, and transmits the result of the automatic operation to the digital-to-analog conversion circuit according to the required time sequence according to the phase relation of each set of data list signals. The central execution circuit 3 provided by the embodiment can automatically operate typical signals with frequencies of 50Hz, 60Hz, 150Hz, 250Hz and the like, which means that the verification device provided by the invention can verify the transformer calibrator 7 with other rated frequencies and the harmonic suppression ratio test.
The programmable device sub-circuit 304 in the central execution circuit 3 provided by the embodiment of the invention adopts an FPGA (Field-Programmable Gate Array), namely a Field programmable gate array. It is a further development product based on the PAL, GAL, CPLD and other programmable devices. The programmable device is used as a semi-custom circuit in the field of Application Specific Integrated Circuits (ASICs), which not only solves the defect of custom circuits, but also overcomes the defect of limited gate circuits of the original programmable device. The circuit design is flexible, the modification is convenient, the integration level is high, and the anti-interference capability is strong. The verification device provided by the invention adopts ALTERA-EP1K30QC208-3N and is provided with 30000 gates, the number of 1728 macro units is reached, the frequency is 80MHz, and all digital logic operations can be finished by a single chip, so that the verification device is stable and reliable.
The central execution sub-circuit 301 provided in this embodiment adopts the CPLD to control the starting time sequence of each path of dc-ac conversion, each cycle has 32768 time sequence pulses, and the resolution of one cycle phase shift can reach 360 °/32768, namely 0.011 ° or 0.66'. The concept of conversion into radian is 0.0192%, which is far less than 0.2% of the irrelevance of the ratio difference and the angle difference of the calibrating device of the transformer calibrator 7. The method for realizing the phase shift of the digital signal has high phase shift resolution, so that the possibility of inaccurate phase shift is avoided.
Therefore, the central execution circuit 3 and the microprocessor 201 provided by the embodiment of the invention can realize more automatic functions.
The output end of the digital-to-analog conversion circuit 4 is connected with the input end of the power amplifier circuit 5;
the digital-to-analog conversion circuit 4 is configured to convert the result of the automatic operation into an analog signal, and send the analog signal to the power amplifier circuit 5; the analog quantity signals comprise voltage analog quantity signals, current analog quantity signals, difference voltage analog quantity signals and difference current analog quantity signals;
the digital-to-analog conversion circuit 4 converts the result of the automatic operation of the four sets of data list signals according to the timing relationship of the timing sequence number sub-circuit 303 to obtain analog signals, which are respectively a voltage analog signal, a current analog signal, a difference voltage analog signal and a difference current analog signal.
Specifically, the digital-to-analog conversion circuit 4 includes: a dc-ac conversion sub-circuit 401, an ac-dc conversion sub-circuit 402, and a range switching sub-circuit 403;
the input end of the dc-ac conversion sub-circuit 401, the output end of the ac-dc conversion sub-circuit 402 and the input end of the range switching sub-circuit 403 are respectively connected with the output end of the central execution circuit 3;
The output end of the dc-ac conversion sub-circuit 401 and the input end of the ac-dc conversion sub-circuit 402 are respectively connected with one of the power amplifier circuits 5;
the output end of the range switching sub-circuit 403 is respectively connected with the input end of the power amplifier circuit 5 and the input end of the sampling analog-to-digital conversion circuit 6;
the dc-ac conversion sub-circuit 401 is configured to convert the result of the automatic operation of the central execution circuit 3 into an analog signal;
the ac-dc conversion sub-circuit 402 is configured to measure an output result of the sampling analog-to-digital conversion circuit 6 after the buffer processing of the power amplifier circuit 5, and send the measured output result to the central execution circuit 3;
the range switching sub-circuit 403 is configured to send a control signal, and control the power amplifier circuit 5 and the sampling analog-to-digital conversion circuit 6 to output a result according to the switching range by automatically adjusting the switching range.
The dc-ac conversion sub-circuit 401 has four channels, and converts the voltage signal, the current signal, the differential voltage signal and the differential current signal respectively, and obtains a voltage analog signal, a current analog signal, a differential voltage analog signal and a differential current analog signal, where the conversion of each signal by the dc-ac conversion sub-circuit 401 is performed independently, and the signal conversion process of each channel is not interfered with each other.
In this embodiment, the dc-ac conversion sub-circuit 401 is provided, and a mature chip DAC7744 of the AD company is adopted, and the chip can realize 16-bit high-precision voltage type analog output, the adjustment fineness is 1:32768, and four-way signal output is just suitable for the requirements of four-way signal sources of the verification device provided by the invention. The dc-ac conversion sub-circuit 401 is a high-precision digitizer.
The range switching sub-circuit 403 can automatically adjust the range of the range, control the adjusting range of the amplifying buffer sub-circuit 502, control the adjusting range of the isolating booster 601 and the isolating booster 602, and control the adjusting range of the precise voltage transformer 604 and the precise current transformer 605, and because of the circuit independence of the four groups of data list signals, the range of each device is in the optimal output range in any signal conversion process, and when the range of each device reaches the optimal output range, the precise verification of the transformer calibrator 7 can be realized.
The output end of the power amplifier circuit 5 is connected with the input end of the sampling analog-to-digital conversion circuit 6;
the power amplifier circuit 5 is configured to perform power amplification processing on the analog signal, and send the analog signal to the sampling analog-to-digital conversion circuit 6.
The analog signal obtained by the conversion process of the digital-to-analog conversion circuit 4 is subjected to the power amplification process by the power amplification circuit 5 and is pushed into the sampling analog-to-digital conversion circuit 6.
Specifically, the power amplifier circuit 5 includes: a plurality of power amplifier sub-circuits 501 and a plurality of amplifying buffer sub-circuits 502;
each of the power amplifier sub-circuits 501 is connected to the dc-ac conversion sub-circuit 401; one end of each amplifying buffer sub-circuit 502 is respectively connected with the ac-dc conversion sub-circuit 402, and the other end of each amplifying buffer sub-circuit 502 is respectively connected with the range switching sub-circuit 403;
the power amplification sub-circuit 501 is configured to perform power amplification processing on the analog signal, and send the analog signal to the sampling analog-to-digital conversion circuit 6;
the amplifying buffer sub-circuit 502 is configured to receive the control signal of the range switching sub-circuit 403, obtain an output signal by switching the range, and send the output signal to the ac-dc conversion sub-circuit 402.
In this embodiment, the number of the amplifying sub-circuits 501 is four, the number of the amplifying buffer sub-circuits 502 is four, and each of the amplifying sub-circuits 501 and 502 corresponds to a group of data list signals, so as to form independent and non-interfering amplifying channels.
Each group of analog signals is subjected to power amplification processing through a power amplification sub-circuit 501, namely, a voltage analog signal, a current analog signal, a difference voltage analog signal and a difference current analog signal correspond to one power amplification sub-circuit 501 respectively, and each analog signal is sent to a sampling analog-to-digital conversion circuit 6 after being amplified by power.
The output end of the sampling analog-to-digital conversion circuit 6 is connected with the other input end of the central execution circuit 3;
the sampling analog-to-digital conversion circuit 6 is configured to collect the amplified analog signal, perform boosting, current rising and difference value verification processing on the analog signal according to the amplitude value, obtain an output result, and send the output result to the central execution circuit 3; the output result comprises a detection voltage value, a detection current value, a detection difference voltage value and a detection difference current value.
The analog signal after the power amplification process is collected by a sampling analog-to-digital conversion circuit 6, and the sampling analog-to-digital conversion circuit 6 is connected with the central execution circuit 3, so as to perform signal transmission and reading according to the time sequence relation provided by the time sequence number sub-circuit 303.
Specifically, the sampling analog-to-digital conversion circuit 6 includes: a precision voltage transformer 604, a precision current transformer 605, a plurality of isolation boosters 601, a plurality of isolation up-converters 602 and a plurality of voltage division sampling resistors 603;
each isolation booster 601 is respectively connected with one voltage division sampling resistor 603;
each isolation current booster 602 is respectively connected with one voltage division sampling resistor 603;
the precision voltage transformer 604 is connected with the isolation booster 601 through the voltage division sampling resistor 603;
the precision current transformer 605 is connected with the isolation current booster 602 through the voltage division sampling resistor 603;
the isolation booster 601 is configured to receive the analog signal, form a standard ac constant voltage source with the power amplifier sub-circuit 501, output the detection voltage value, where the output detection voltage value can ensure accuracy and stability within a certain load range;
the isolation current booster 602 is configured to receive the analog signal, form a standard ac constant current source with the power amplifier sub-circuit 501, output the detected current value, where the accuracy and stability of the output detected current value can be ensured within a certain load range;
The precision voltage transformer 604 is configured to receive a control signal of the range switching sub-circuit 403, and output the detected differential voltage value;
the precision current transformer 605 is configured to receive the control signal of the range switching sub-circuit 403 and output the detected differential current value.
In this embodiment, two isolation boosters 601 and two isolation boosters 602 are disposed in the verification device, and each isolation booster 602 respectively correspond to a group of data list signals for independent conversion and signal processing of each group of data list signals. One set of data list signals, one direct current-alternating current conversion sub-circuit 401, one power amplifier sub-circuit 501, one amplifying buffer sub-circuit 502, one isolation booster 601 or one isolation booster 602 form one path of signal processing channels, each path of signal processing channel has uncorrelation and mutual noninterference, and the stability of other sets of data list signals is not affected when one set of data list signals is processed.
The analog signal amplified by the power amplifier sub-circuit 501 is transmitted to the isolation booster 601 and the isolation booster 602 for boosting and current-up processing; the output rated voltage of the isolation booster 601 is an alternating voltage of 33V, 100V and 220V, and the adjusting range is 10-120%; the output rated current of the isolation current booster 602 is 0.1A, 0.5A, 1A, 5A and 10A alternating current, and the adjusting range is 1-150%. Due to the uncorrelation of the four sets of data list signals, it is achieved at any time that the adjustment signal is within an optimal output range.
According to the amplitude values of the four sets of data list signals, the microprocessor 201 controls the range switching sub-circuit 403 to switch the range, so as to respectively control the two isolation boosters 601, the two isolation up-converters 602, the precise voltage transformer 604 and the precise current transformer 605 to output results.
Specifically, the voltage output by one of the isolation boosters 601 is the detection voltage value of the transformer calibrator 7, and the current output by one of the isolation boosters 602 is the detection current value of the transformer calibrator 7; the voltage output by the other isolation booster 601 is isolated and output through the precision voltage transformer 604, and the output voltage is the detection difference voltage value of the transformer calibrator 7; the current output by the other isolation current booster 602 is isolated and output through the precision current transformer 605, and the output current is the detection difference current value of the transformer calibrator 7.
The operations of the precision voltage transformer 604 and the precision current transformer 605 are performed by the microprocessor 201 through the common control of the central execution circuit 3 and the range switching sub-circuit 403.
The results output by the two isolation boosters 601, the two isolation up-converters 602, the precision voltage transformer 604 and the precision current transformer 605, that is, the detected voltage value, the detected current value, the detected difference voltage value and the detected difference current value are transmitted to the transformer calibrator 7 to be detected, and at the same time, the detected voltage value, the detected current value, the detected difference voltage value and the detected difference current value are returned to the power amplifier circuit 5 for further calibration processing.
The detected voltage value, the detected current value, the detected differential voltage value and the detected differential current value are transmitted to the detected transformer calibrator 7, so that the transformer calibrator 7 is calibrated by the detected values, and the standard output voltage, current, differential voltage and differential current values of the transformer calibrator 7 are accurately adjusted to ensure the normal use of the transformer calibrator 7. Since the microprocessor 201 can control the central execution circuit 3 to output four different sets of data list signals having the functions of independently adjusting amplitude values and adjusting phase relationships. Therefore, four groups of different analog quantity signals obtained through conversion of the digital-to-analog conversion circuit can be output independently through adjusting amplitude values and phase relation, and the functions of accurately calibrating the transformer calibrator 7 can be achieved through power amplification processing and output processing of the power amplification circuit 5 and the sampling analog-to-digital conversion circuit 6.
The detected voltage value, the detected current value, the detected differential voltage value and the detected differential current value are returned to the power amplifier circuit 5 for negative feedback measurement and adjustment, so that the output monitoring of the verification device and the verification accuracy of the automatic control transformer calibrator 7 can be realized. The detection voltage value output by the isolation booster 601 enters the amplification buffer sub-circuit 502 through the voltage division sampling resistor 603 and the precision voltage transformer 604, the detection current value output by the isolation booster 602 enters different amplification buffer sub-circuits 502 through the voltage division sampling resistor 603 and the precision current transformer 605, the amplification buffer sub-circuits 502 automatically switch the range to match different detection voltage values and detection current values under the control of the range switching sub-circuit 403, and the output result processed by the amplification buffer sub-circuits 502 is transmitted to the AC-DC conversion sub-circuit 402 for measurement.
The ac-dc conversion sub-circuit 402 is a high-speed parallel successive approximation ac-dc conversion circuit, and a 16-bit chip AD7656BSTZ from AD company is an analog-digital converter with high integration, 6 channels, and 16bit Successive Approximation (SAR).
The output result received by the ac-dc conversion sub-circuit 402 is automatically read by the central execution circuit 3 through the serial data bus, so that the central execution circuit 3 is also used to send the output result to the data processing circuit 2; the output result obtained by the central execution circuit 3 is transmitted to the microprocessor 201 through the parallel bus, so the data processing circuit 2 is further configured to verify the output result according to a preset value, so as to perform negative feedback adjustment, and obtain a standard output result; the standard output result comprises a standard voltage value, a standard current value, a standard deviation voltage value and a standard deviation current value.
The microprocessor 201 processes the output voltage signal, current signal, amplitude value and phase relation of the difference voltage signal and the difference current signal, compares the voltage signal, the current signal and the amplitude value with the phase relation of the difference current signal according to preset values, and further performs negative feedback adjustment to accurately adjust the detected voltage value, the detected current value, the detected difference voltage value and the detected difference current value of the detected transformer calibrator 7, so as to judge whether the detected values meet the requirement of the use precision of the transformer calibrator 7, and realize the accuracy of the output signal of the transformer calibrator 7.
Meanwhile, the microprocessor 201 displays the output standard voltage value, standard current value, standard deviation voltage value and standard deviation current value on the display screen 102, so as to facilitate the observation of the verification result of the transformer calibrator 7.
Because the amplifying buffer sub-circuits 502 are four, the amplifying buffer sub-circuits are just used for respectively outputting four groups of detection values according to the control of the range switching sub-circuits 403, so as to obtain output signals.
The range switching sub-circuit 403 can automatically switch ranges to respectively control the amplifying buffer sub-circuit 502, the isolating booster 601, the isolating current booster 602, the precision voltage transformer 604 and the precision current transformer 605, and adjust in the respective optimal ranges; the process of achieving the optimal adjustment range is the process of accurately verifying the transformer calibrator 7.
In the actual verification process, the sampling analog-to-digital conversion circuit 6 divides the detection voltage signal by using a voltage division sampling resistor 603 to generate a small voltage to the amplifying buffer sub-circuit 502, and outputs the small voltage to the first channel of the alternating current-direct current conversion sub-circuit 402 using AD7656BSTZ through the amplifying buffer sub-circuit 502; the precision current transformer 605 and the voltage dividing sampling resistor 603 are adopted to isolate the measured current signal to generate small voltage to the other amplifying buffer sub-circuit 502, and the small voltage is output to the second channel of the alternating current-direct current conversion sub-circuit 402 adopting the AD7656BSTZ through the amplifying buffer sub-circuit 502; likewise, the differential voltage value and the differential current value are also respectively supplied to different channels. Because the four sets of data list signals acquired by the man-machine interaction circuit 1 are sine wave signals, the central execution circuit 3 controls the alternating current-direct current conversion sub-circuit 402 to uniformly sample 512 points in a sine wave period, the sampled data are transmitted to the central execution circuit 3 through the isolated serial data bus, the microprocessor 201 acquires the sampled data received by the central execution circuit 3 through the parallel data bus, and finally, verification is performed according to a preset value, so that a standard output result is obtained, and accurate verification of the transformer calibrator 7 is realized. The accuracy of the simple device of the common transformer calibrator 7 is generally 0.5 level, and the calibrating device provided by the embodiment of the invention realizes the accuracy of 0.05 level by utilizing each processing circuit and control software.
Preferably, the apparatus further comprises: and the switching power supply circuit is connected with the power amplifier circuit 5 and is used for supplying power to the power amplifier circuit 5.
In this embodiment, the switching power supply circuit adopts ±33v power supply as the power supply of the power amplifier circuit 5.
In practical application, the verification device provided by the invention adopts a 4U standard metal chassis, and all circuits and components provided by the invention are arranged in the 4U standard metal chassis.
As can be seen from the above technical solutions, the embodiment of the present invention provides a verification device for a transformer calibrator based on detection feedback, including: the device comprises a man-machine interaction circuit 1, a data processing circuit 2, a central execution circuit 3, a sampling analog-to-digital conversion circuit 6, a digital-to-analog conversion circuit 4 and a power amplifier circuit 5, wherein the output end of the man-machine interaction circuit 1 is connected with the input end of the data processing circuit 2; the output end of the data processing circuit 2 is connected with one input end of the central execution circuit 3; the output end of the central execution circuit 3 is connected with the input end of the digital-to-analog conversion circuit; the output end of the digital-to-analog conversion circuit is connected with the input end of the power amplifier circuit 5; the output end of the power amplifier circuit 5 is connected with the input end of the sampling analog-to-digital conversion circuit 6; the output end of the sampling analog-digital conversion circuit 6 is connected with the other input end of the central execution circuit 3. According to the verification device provided by the invention, four groups of data list signals of the detected transformer calibrator 7, namely voltage signals, current signals, difference voltage signals and difference current signals, are obtained through the human-computer interaction circuit 1, and the amplitude values and the phase relations of the four groups of data list signals are obtained through the processing of the data processing circuit 2; the amplitude values of the four groups of data list signals are sent to digital-to-analog conversion circuits of different channels through a central execution circuit 3 according to the phase relation, so that four groups of different analog quantity signals, namely a voltage analog quantity signal, a current analog quantity signal, a difference voltage analog quantity signal and a difference current analog quantity signal, are obtained; the four groups of analog quantity signals enter different power amplification subcircuits 501 to be subjected to power amplification treatment, the treated result is collected by a sampling analog-to-digital conversion circuit 6, and the treated result is treated by an isolation booster 601, an isolation current booster 602, a precision voltage transformer 604 and a precision current transformer 605 according to amplitude values to obtain a detection voltage value, a detection current value, a detection difference voltage value and a detection difference current value; and the four groups of values are respectively sent to the detected transformer calibrator 7 and the amplifying buffer sub-circuit 502 for negative feedback detection and adjustment; the output of the processing result is transmitted to the central execution circuit 3 through the serial data bus and finally transmitted to the data processing circuit 2 through the parallel data bus; the data processing circuit 2 performs verification according to the preset value and the detected four groups of values, so as to further perform negative feedback detection and adjustment, so as to accurately adjust the detected voltage value, the detected current value, the detected difference voltage value and the detected difference current value of the detected transformer calibrator 7, judge whether the detected values meet the requirement of the use precision of the transformer calibrator 7, and realize the accuracy of the output signal of the transformer calibrator 7, wherein the four groups of standard detection values obtained after adjustment are the accurate detection values of the detected transformer calibrator 7, and the four groups of standard detection values are the standard voltage value, the standard current value, the standard difference voltage value and the standard difference current value.
The verification device provided by the application adopts four paths of channels which are mutually independent on a circuit and are formed by a direct current-alternating current conversion sub-circuit 401, a power amplifier sub-circuit 501, an isolation booster 601 or an isolation booster 602 and a precision voltage transformer 604 or a precision current transformer 605, wherein the amplitude value and the phase relation between each path of channels are processed by a microprocessor 201 and the automatic control output of a central execution sub-circuit 301; and the automatic verification function is realized according to the preset calibration points, and the verification device provided by the application has the advantages of less circuit links, simple circuit and effectively reduced failure rate. Therefore, the calibrating device provided by the application has the characteristic of high-precision calibration, and can improve the stability and accuracy of the output signal of the calibrating transformer calibrator 7.
Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It is to be understood that the invention is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. Calibrating installation of mutual-inductor check gauge based on detect feedback, its characterized in that includes: the system comprises a man-machine interaction circuit (1), a data processing circuit (2), a central execution circuit (3), a digital-to-analog conversion circuit (4), a power amplifier circuit (5) and a sampling analog-to-digital conversion circuit (6), wherein,
the output end of the man-machine interaction circuit (1) is connected with the input end of the data processing circuit (2);
the output end of the data processing circuit (2) is connected with one input end of the central execution circuit (3);
the output end of the central execution circuit (3) is connected with the input end of the digital-to-analog conversion circuit (4);
the output end of the digital-to-analog conversion circuit (4) is connected with the input end of the power amplifier circuit (5);
the output end of the power amplifier circuit (5) is connected with the input end of the sampling analog-to-digital conversion circuit (6);
the output end of the sampling analog-to-digital conversion circuit (6) is connected with the other input end of the central execution circuit (3);
The man-machine interaction circuit (1) is used for outputting four groups of data list signals of the transformer calibrator; the four sets of data list signals include a voltage signal, a current signal, a differential voltage signal, and a differential current signal;
the data processing circuit (2) is used for processing the four groups of data list signals to obtain the relation between the amplitude values and the phases of the four groups of data list signals;
the central execution circuit (3) is used for carrying out automatic operation according to the amplitude value and sending the result of the automatic operation to the digital-to-analog conversion circuit (4) according to the phase relation;
the digital-to-analog conversion circuit (4) is used for converting the result of the automatic operation into an analog signal and transmitting the analog signal to the power amplifier circuit (5); the analog quantity signals comprise voltage analog quantity signals, current analog quantity signals, difference voltage analog quantity signals and difference current analog quantity signals;
the power amplifier circuit (5) is used for performing power amplification processing on the analog quantity signal and transmitting the analog quantity signal to the sampling analog-to-digital conversion circuit (6);
the sampling analog-to-digital conversion circuit (6) is used for collecting the analog quantity signals after the amplification processing, boosting, current rising and difference value verification processing the analog quantity signals according to the amplitude values to obtain output results, and sending the output results to the central execution circuit (3); the output result comprises a detection voltage value, a detection current value, a detection difference voltage value and a detection difference current value;
-said central execution circuit (3) is further adapted to send said output result to said data processing circuit (2);
the data processing circuit (2) is also used for checking the output result according to a preset value and performing negative feedback adjustment to obtain a standard output result; the standard output result comprises a standard voltage value, a standard current value, a standard deviation voltage value and a standard deviation current value.
2. The apparatus according to claim 1, wherein the data processing circuit (2) comprises: a microprocessor (201) and a communication input interface (202) connected with the microprocessor (201), wherein the microprocessor (201) is connected with the man-machine interaction circuit (1);
the microprocessor (201) is used for acquiring the four groups of data list signals and processing the four groups of data list signals to obtain the relation between the amplitude values and the phases of the four groups of data list signals;
the microprocessor (201) is further used for controlling the central execution circuit (3) to independently adjust the amplitude value and the phase relation, checking according to a preset value, and performing negative feedback adjustment on the output result to obtain a standard output result;
the communication input interface (202) is used for transmitting the four groups of data list signals between the microprocessor (201) and the man-machine interaction circuit (1).
3. The apparatus according to claim 2, wherein the central execution circuit (3) comprises: a central execution sub-circuit (301), a timing number sub-circuit (303), a memory (302) and a programmable device sub-circuit (304);
-said central execution sub-circuit (301) is connected to said microprocessor (201);
the sequential number sub-circuit (303), the memory (302) and the programmable device sub-circuit (304) are respectively connected with the central execution sub-circuit (301);
-said memory (302) for storing said four sets of data list signals and said output result;
the programmable device sub-circuit (304) is used for performing automatic operation according to the amplitude value to obtain an automatic operation result;
the timing subsystem (303) is configured to provide timing relationships for the central execution circuit (3) and the digital-to-analog conversion circuit (4).
4. The apparatus according to claim 1, wherein the digital-to-analog conversion circuit (4) comprises: a DC-AC conversion sub-circuit (401), an AC-DC conversion sub-circuit (402) and a range switching sub-circuit (403);
the input end of the direct current-alternating current conversion sub-circuit (401), the output end of the alternating current-direct current conversion sub-circuit (402) and the input end of the range switching sub-circuit (403) are respectively connected with the output end of the central execution circuit (3);
The output end of the direct current-alternating current conversion sub-circuit (401) and the input end of the alternating current-direct current conversion sub-circuit (402) are respectively connected with one power amplifier circuit (5);
the output end of the range switching sub-circuit (403) is respectively connected with the input end of the power amplifier circuit (5) and the input end of the sampling analog-to-digital conversion circuit (6);
the direct current-alternating current conversion sub-circuit (401) is used for converting the result of the automatic operation of the central execution circuit (3) into an analog quantity signal;
the alternating current-direct current conversion sub-circuit (402) is used for measuring the output result of the sampling analog-to-digital conversion circuit (6) after the power amplifier circuit (5) is operated and buffered, and sending the output result to the central execution circuit (3);
the range switching sub-circuit (403) is used for sending out a control signal, and the power amplifier circuit (5) and the sampling analog-to-digital conversion circuit (6) are controlled to output a result according to the switching range by automatically adjusting the switching range.
5. The device according to claim 4, characterized in that the power amplifier circuit (5) comprises: a plurality of power amplifier sub-circuits (501) and a plurality of amplifying buffer sub-circuits (502);
each power amplifier sub-circuit (501) is respectively connected with the direct current-alternating current conversion sub-circuit (401); one end of each amplifying buffer sub-circuit (502) is respectively connected with the alternating current-direct current conversion sub-circuit (402), and the other end of each amplifying buffer sub-circuit (502) is respectively connected with the range switching sub-circuit (403);
The power amplification sub-circuit (501) is used for performing power amplification processing on the analog quantity signal and sending the analog quantity signal to the sampling analog-to-digital conversion circuit (6);
the amplifying buffer sub-circuit (502) is used for receiving the control signal of the range switching sub-circuit (403), obtaining an output signal through switching the range, and sending the output signal to the alternating current-direct current conversion sub-circuit (402).
6. The apparatus according to claim 5, wherein the sampling analog-to-digital conversion circuit (6) comprises: a precision voltage transformer (604), a precision current transformer (605), a plurality of isolation boosters (601), a plurality of isolation up-converters (602) and a plurality of voltage division sampling resistors (603);
each isolation booster (601) is respectively connected with one voltage division sampling resistor (603);
each isolation current booster (602) is respectively connected with one voltage division sampling resistor (603);
the precise voltage transformer (604) is connected with the isolation booster (601) through the voltage division sampling resistor (603);
the precision current transformer (605) is connected with the isolation current booster (602) through the voltage division sampling resistor (603);
the isolation booster (601) is used for receiving the analog quantity signal, forming a standard alternating current constant voltage source with the power amplifier sub-circuit (501) and outputting the detection voltage value;
The isolation current booster (602) is used for receiving the analog quantity signal, forming a standard alternating current constant current source with the power amplifier sub-circuit (501) and outputting the detection current value;
the precision voltage transformer (604) is used for receiving a control signal of the range switching subcircuit (403) and outputting the detection difference voltage value;
the precision current transformer (605) is used for receiving the control signal of the range switching subcircuit (403) and outputting the detection difference current value.
7. The apparatus according to claim 2, wherein the human-machine interaction circuit (1) comprises: the device comprises a controller (101), a keyboard (104), a display screen (102) and a communication output interface (103); the keyboard, the display screen (102) and the communication output interface (103) are respectively connected with one end of the controller (101), and the other end of the controller (101) is connected with the microprocessor (201);
the display screen (102) is used for displaying the output result and the standard output result;
the communication output interface is used for being connected with a communication input interface (202) of the data processing circuit (2) and outputting the four groups of data list signals;
the keyboard is used for inputting instructions;
the controller (101) is used for controlling the display screen (102) to display, controlling the communication output interface to output signals and receiving instructions input by the keyboard.
8. The apparatus of claim 1, wherein the apparatus further comprises: and the switching power supply circuit is connected with the power amplifier circuit (5) and is used for supplying power to the power amplifier circuit (5).
9. The apparatus of claim 4, wherein the ac-dc conversion sub-circuit (402) is a successive approximation analog-to-digital converter; the DC-AC conversion sub-circuit (401) is a high-precision digital converter.
10. The device according to claim 6, characterized in that the regulation range of the isolation booster (601) is 10-120%; the adjusting range of the isolation upflow device (602) is 1% -150%.
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| CN110231586A (en) * | 2019-04-11 | 2019-09-13 | 浙江三辰电器股份有限公司 | The application method of mutual inductor gamut self-calibrating device |
| CN110456301A (en) * | 2019-07-08 | 2019-11-15 | 珠海普斯雷电子科技有限公司 | Data analyze situ metrology device tester |
| CN111289783B (en) * | 2019-12-31 | 2022-09-06 | 清研电气（武汉）有限公司 | Whole check device calibrator and calibration circuit thereof |
| CN115542231B (en) * | 2022-12-01 | 2023-03-21 | 中国电力科学研究院有限公司 | Device is examined in whole to wide band calibrator based on standard source |
| CN117310240B (en) * | 2023-11-30 | 2024-02-09 | 国网山西省电力公司营销服务中心 | Signal source generation system and method for calibrating device of transformer calibrator |
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