CN216792428U - Self-balancing comparator type mutual inductor calibrator - Google Patents
Self-balancing comparator type mutual inductor calibrator Download PDFInfo
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- CN216792428U CN216792428U CN202123014630.9U CN202123014630U CN216792428U CN 216792428 U CN216792428 U CN 216792428U CN 202123014630 U CN202123014630 U CN 202123014630U CN 216792428 U CN216792428 U CN 216792428U
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Abstract
The utility model relates to a self-balancing comparator type mutual inductor calibrator.A I/V conversion unit converts the working current of a current comparator into working voltage through a sampling resistor r; the resistance-capacitance shunt unit is electrically connected with the I/V conversion unit, the voltage transformer, the digital nanoampere meter and the central control unit, and the working voltage is converted into in-phase voltage and orthogonal voltage with polarity through the voltage transformer; the resistance-capacitance shunt unit converts the in-phase voltage and the orthogonal voltage into an in-phase component and an orthogonal component respectively and inputs the in-phase component and the orthogonal component into a digital nanoampere meter; the digital nanoampere meter is communicated with the central control unit through the A/D. The embedded control module is adopted, so that the automatic balance, the automatic control and the automatic data transmission are realized, the error data is directly displayed, the problems of low testing efficiency and error reading of the traditional electrical type calibrator are solved, the automatic control and the data networking transmission in the testing process of the calibrator are realized, and the intelligent level is improved; the test precision is greatly improved.
Description
Technical Field
The utility model relates to the field of electrical measurement, in particular to a self-balancing comparator type mutual inductor calibrator.
Background
The comparator type mutual inductor calibrator is a device for measuring high-accuracy (accuracy is higher than 0.001 level) current proportional error, the traditional electrical type comparator type mutual inductor calibrator adopts a pointer instrument and a manual drive plate to perform bridge balance adjustment, and the following defects exist: 1. the pointer instrument has a manual reading error; 2. when the manual dial plate is used for adjusting the balance of the bridge, the phenomenon of manual reading of the indicated data is wrong, and the correctness of the final error data is influenced; the phenomenon of poor contact exists when the manual driving plate is operated for a long time, and the accurate measurement and display of errors are influenced; the manual drive plate needs to repeatedly adjust the in-phase component and the orthogonal component, the average test time is longer than 5min, and the test efficiency is low; 3. error data depends on manual reading and copying, the phenomena of data reading and copying errors exist, and the digital and networked transmission functions are not realized; 4. the error measurement range is narrow, and the current proportion measurement capability with higher accuracy is not realized; 5. and does not have an intelligent control function.
Disclosure of Invention
In view of this, the present invention provides a self-balancing comparator type transformer calibrator, which converts a working current into a working voltage by applying a current comparator to measure a small current principle under the working voltage, decomposes the working current into a differential current input by a line test circuit of an in-phase current and a quadrature current balance current comparator through resistance-capacitance shunt, tests a weak current signal input to a current node through a digital nanoampere meter, adjusts the in-phase current and the quadrature current through current feedback, makes the current of the node infinitely approach zero current, realizes the self-regulation of current balance, and measures the error of the current comparator or the current transformer.
In order to achieve the purpose, the technical scheme is as follows:
the utility model provides a self-balancing comparator formula mutual-inductor check gauge, includes central control unit, with central control unit electric connection's display terminal and communication module to and the power module for each module power supply, still include:
the I/V conversion unit converts the working current of the current comparator into working voltage through a sampling resistor r of 0.1 omega;
a voltage transformer converting the operating voltage into in-phase voltage and quadrature voltage having polarities;
the resistance-capacitance shunt unit is electrically connected with the voltage transformer and the digital nanoampere meter, converts the in-phase voltage and the orthogonal voltage into an in-phase component Ig and an orthogonal component Ic respectively, injects the in-phase component Ig and the orthogonal component Ic and a difference current delta I into the same current node A1, and inputs the in-phase component Ig and the orthogonal component Ic and the difference current delta I into the digital nanoampere meter;
the digital nanoampere meter is communicated with the central control unit through the A/D, is used for judging the current injected into a current node A1 and feeds the current back to the resistance-capacitance shunt unit through the central control unit;
the I/V conversion unit comprises a sampling resistor r which is connected in parallel with the To end and the Tx end of the working current input end of the current comparator;
the voltage transformer comprises a coil group A connected into a current comparator To and a Tx end, and a coil winding a '' which are used as output ends;
the resistance-capacitance shunt unit comprises an in-phase electronic switch Kf, an adjustable resistor G, an orthogonal electronic switch K delta and an adjustable capacitor C, wherein the in-phase electronic switch Kf and the adjustable resistor G are connected in series, the in-phase electronic switch Kf is connected to a polarity end ' + ' of a coil winding a ', the orthogonal electronic switch K delta and the adjustable capacitor C are connected in series, the electronic switch K delta is connected to a polarity end ' + ' of a coil winding a ' ', the adjustable resistor G, the adjustable capacitor C and a K end of a differential current delta I are connected to a current node A1, and a D end of the differential current delta I is connected to a central point G of the coil winding a ' and a ' ' through a normally closed contact of a relay J1 and a central point G of the coil winding a '0The terminal K of the difference current delta I is connected with the normally open contact of the relay J1, the terminal D is connected with the common contact of the relay J1, and the normally closed contact of the relay J1 is connected with the central point G0The current node A1 is connected to a digital nanoampere meter, and the adjustable resistor G and the adjustable capacitor C are adjusted to ensure that the current of the current node A1 is less than 0.1 nA;
the digital nanoampere meter comprises a resistor R, an operational amplifier, a resistor R3, a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2, wherein the resistor R is connected between K 'and D' ends of the digital nanoampere meter, the K 'is connected with a current node A1, and the D' end is connected with a central point G of a voltage transformer0The operational amplifier is connected to a K ' end and a grounding point, the head end and the tail end of the resistor R3 are respectively connected with a Vp end and a Vo end of the operational amplifier, the Vo end of the operational amplifier is connected with the head end of a resistor R1, the tail end of a resistor R1 is connected with the head end of a capacitor C1, the tail end of a capacitor C1 is connected to a D ' end, meanwhile, the head end of a capacitor C2 is connected with the tail end of a resistor R1, the tail end of a capacitor C2 is connected with the head end of a resistor R2, the tail end of a resistor R2 is connected to the D ' end, and the line output ends of K ' and D ' of the digital nanoampere meter are connected with A/D;
wherein, the resistor R = 1K-10K, the resistor R3= 0.1K-100K, the resistor R1=1K, the resistor R2= 1K-100K, the capacitor C1=100 μ F, and the capacitor C2=0.1 μ F.
Preferably, the in-phase electronic switch Kf and the quadrature electronic switch K delta are in an Omron G3VM model, the relay J1 is in a DS2Y-12 model, the operational amplifier is in an OPA140 model, and the A/D chip is in an AD7606 model.
Preferably, the central control unit adopts an STM32 system MCU, a 32-bit high-performance processor.
Preferably, the display terminal is connected with the central control unit through a modbus communication protocol.
Preferably, the power module supplies power through an AC/DC circuit and an internal lithium battery, and the capacity of the lithium battery is more than or equal to 16.8V by 7.5 Ah;
the lithium battery converts DC16.8V power into DC12V power through a DC/DC circuit to supply power for the display terminal and the electronic switch, and converts the power into DC5V power to supply power for the electronic circuit and the central control unit.
The beneficial effects of the utility model are:
the embedded control module is adopted, so that the automatic balance, the automatic control, the automatic data transmission and the direct display of error data are realized, the problems of low testing efficiency and manual reading and recording errors of the traditional electrical type calibrator are solved, the automatic control and the data networking transmission in the testing process of the calibrator are realized, and the intelligent level is improved; minimum reading of error measurement: the same phase part is 1 x 10-9Orthogonal component of 1 × 10-9rad, sensitivity of the built-in digital nanoammeter is 1 multiplied by 10-10And A, the test precision is greatly improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:
FIG. 1 is a schematic diagram of the system control of the present invention;
FIG. 2 is a schematic diagram of the circuit of the present invention;
fig. 3 is a working principle diagram of the digital nanoampere meter according to the utility model.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Please refer to fig. 1-3:
the utility model provides a self-balancing comparator formula mutual-inductor check gauge, includes central control unit 1, with 1 electric connection's of central control unit display terminal 2 and communication module 3 to and power module 4 for each module power supply, still include:
an I/V conversion unit 5 for converting the working current of the current comparator into a working voltage U via a sampling resistor r of 0.1 omega2m；
A voltage transformer 7 for converting the operating voltage U2mConverting to in-phase and quadrature voltages having polarities;
the resistance-capacitance shunt unit 6 is electrically connected with the digital nanoampere meter 8 and the voltage transformer 7, the resistance-capacitance shunt unit 6 converts in-phase voltage and orthogonal voltage into in-phase component Ig and orthogonal component Ic of small current signals through a decimal resistance-capacitance array, the in-phase component Ig and the orthogonal component Ic and a difference current delta I are injected into the same current node A1 and input into the digital nanoampere meter 8, the digital nanoampere meter 8 obtains node micro-current through resistance sampling, amplifying and filtering circuits of the total current of the in-phase current Ig, the orthogonal current Ic and the difference current delta I, the node micro-current is input into the central control unit 1 through A/D9 conversion, the central control unit 1 adjusts the resistance-capacitance array and the polarity of the in-phase voltage and the orthogonal voltage according to the digital signals input through A/D9 conversion, the digital nanoampere meter 8 indicates less than 0.1nA through continuous negative feedback circulation, and the central control unit 1 converts the in-phase current Ig and the orthogonal current according to the resistance capacitance values, obtaining the measured small current relative to the working voltage U2mObtaining the errors f and delta of the detected mutual inductor relative to the current comparator by the in-phase components delta Ix, delta Ix = -Ig and the orthogonal components delta Iy, delta Iy = -Ic;
the digital nanoampere meter 8 is communicated with the central control unit 1 through A/D9 conversion, is used for judging the measured current of the current node A1 and feeds back the current to the resistance-capacitance shunt unit 6 through the central control unit 1;
the I/V conversion unit 5 comprises a sampling resistor r which is connected in parallel with the To end and the Tx end of the working current input end of the current comparator;
the voltage transformer 7 comprises a coil group A connected into the current comparator To and the Tx end, and a coil winding a' and a coil winding a ″ which are used as output ends;
the resistance-capacitance shunt unit 6 comprises an in-phase electronic switch Kf, an adjustable resistor G, an orthogonal electronic switch K delta and an adjustable capacitor C, wherein the in-phase electronic switch Kf is connected with the adjustable resistor G in series, the in-phase electronic switch Kf is connected with a polarity end of a coil winding a 'in a plus mode, the orthogonal electronic switch K delta is connected with the adjustable capacitor C in series, the electronic switch K delta is connected with a polarity end of a coil winding a' in a plus mode, the adjustable resistor G, the adjustable capacitor C and a K end of a difference current delta I are connected with a current node A1, and a D end of the difference current delta I is connected with a central point G of the coil winding a 'and a central point G of the coil winding a' through a normally closed contact of a relay J10The terminal K of the difference current delta I is connected with the normally open contact of the relay J1, the terminal D is connected with the common contact of the relay J1, and the normally closed contact of the relay J1 is connected with the central point G0The current node A1 is connected to a digital nanoampere meter, and the adjustable resistor G and the adjustable capacitor C are adjusted to ensure that the current of the current node A1 is less than 0.1 nA; the in-phase electronic switch Kf and the orthogonal electronic switch K delta are in an Omron G3VM model, and the relay J1 is in a DS2Y-12 model;
the I/V conversion unit 5 converts the secondary current I of the proportional winding of the current comparator through a sampling resistor of 0.1 omega2mConverted into a working voltage U2m；
The central control unit 1 adopts an STM32 system MCU and a 32-bit high-performance processor, and is connected with a power module 4, a resistance-capacitance array feedback control module, an A/D9 and a control signal output and communication module 3; the display terminal 2 is connected with the STM32 central control unit 1 through a modbus communication protocol, the display terminal 2 receives parameter touch input such as current range, function switching, precision selection and the like, and display output is carried out: the current dial indicator displays the error in-phase component, the error quadrature component and the measurement state; the power module 4 is powered by a lithium battery attached in the AC/DC circuit, and the capacity of the lithium battery is more than or equal to 16.8V by 7.5 Ah; the lithium battery is converted into a 12V power supply through a DC/DC circuit to supply power for the display terminal 2 and the electronic switch, and is converted into a 5V power supply to supply power for the electronic circuit and the central control unit 1.
Example one
Based on the above, the digital nanoamp meter 8 includes a resistor R, an operational amplifier, a resistor R3, a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2, where the resistor R is connected between ends K 'and D' of the digital nanoamp meter, K 'is connected to a current node a1, and D' is connected to a center point G of a voltage transformer0The operational amplifier is connected to a K ' end and a grounding point, the head end and the tail end of the resistor R3 are respectively connected with the Vp end and the Vo end of the operational amplifier, the Vo end of the operational amplifier is connected with the head end of the resistor R1, the tail end of the resistor R1 is connected with the head end of the capacitor C1, the tail end of the capacitor C1 is connected to a D ' end, meanwhile, the head end of the capacitor C2 is connected with the tail end of the resistor R1, the tail end of the capacitor C2 is connected with the head end of the resistor R2, the tail end of the resistor R2 is connected to the D ' end, and the K ' line output end and the D ' line output end of the digital nanoampere meter are connected with A/D; the resistor R =1K, the resistor R3=0.1K, the resistor R1=1K, the resistor R2=1K, the capacitor C1=100 μ F, the capacitor C2=0.1 μ F, the operational amplifier model is OPA140, and the A/D chip is AD 7606.
Example two
Based on the above, the digital nanoamp meter 8 includes a resistor R, an operational amplifier, a resistor R3, a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2, wherein the resistor R is connected between ends K 'and D' of the digital nanoamp meter, K 'is connected to a current node a1, and D' is connected to a central point G of a voltage transformer0The operational amplifier is connected to a K ' end and a grounding point, the head end and the tail end of the resistor R3 are respectively connected with a Vp end and a Vo end of the operational amplifier, the Vo end of the operational amplifier is connected with the head end of a resistor R1, the tail end of a resistor R1 is connected with the head end of a capacitor C1, the tail end of a capacitor C1 is connected to a D ' end, meanwhile, the head end of a capacitor C2 is connected with the tail end of a resistor R1, the tail end of a capacitor C2 is connected with the head end of a resistor R2, the tail end of a resistor R2 is connected to the D ' end, and the line output ends of K ' and D ' of the digital nanoampere meter are connected with A/D; wherein the resistance R =55K, resistance R3=5K, resistance R1=5K, resistance R2=1K, capacitance C1=100 μ F, capacitance C2=0.1 μ F, and further, the operational amplifier model is OPA140 and the a/D chip model is AD 7606.
EXAMPLE III
The digital nanoampere meter 8 comprises a resistor R, an operational amplifier, a resistor R3, a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2, wherein the resistor R is connected between K 'and D' ends of the digital nanoampere meter, the K 'is connected with a current node A1, and the D' end is connected with a central point G of a voltage transformer0The operational amplifier is connected to a K ' end and a grounding point, the head end and the tail end of the resistor R3 are respectively connected with a Vp end and a Vo end of the operational amplifier, the Vo end of the operational amplifier is connected with the head end of a resistor R1, the tail end of a resistor R1 is connected with the head end of a capacitor C1, the tail end of a capacitor C1 is connected to a D ' end, meanwhile, the head end of a capacitor C2 is connected with the tail end of a resistor R1, the tail end of a capacitor C2 is connected with the head end of a resistor R2, the tail end of a resistor R2 is connected to the D ' end, and the line output ends of K ' and D ' of the digital nanoampere meter are connected with A/D; the resistor R =10K, the resistor R3=10K, the resistor R1=1K, the resistor R2=100K, the capacitor C1=100 μ F, the capacitor C2=0.1 μ F, the model of the operational amplifier is OPA140, and the model of the A/D chip is AD 7606.
According to the embodiment, the self-balancing comparator type mutual inductor calibrator has two functions of zero setting and comparator.
The zero setting function is used for adjusting the working magnetic flux of the current comparator to be zero magnetic flux by the current comparator through the external load zero setting box; at this point, the calibrator delta current input K, D is closed via relay J1 to short the delta current.
The function of the comparator is used for testing the error of the current comparator, and at the moment, the differential current input end K, D of the calibrator passes through the normally closed contact of the relay J1, so that the differential current of the current comparator is kept to be input into the calibrator.
The error testing method comprises the following steps:
(1) the power supply of the calibrator is realized, the function of a comparator is selected at the display terminal 2 of the calibrator, and the parameters are input: the current range is 5A, and the precision is 0.2 multiplied by 10-6；
(2) Adjusting a test power supply of the current comparator to enable the current percentage of the calibrator to be 20%, and starting a 'test' key;
(3) proportional winding secondary current I of current comparator2=1A, the operating voltage of the calibrator is U2=0.1 Ω × 5A × 20% =0.1V, the in-phase voltage Ug = ± 0.1V, and the quadrature voltage Uc = ± 0.03183V.
(4) The resistance-capacitance shunt unit 6 does not operate the resistance-capacitance array electronic switch, and the size of current delta I injected by the differential current input end K, D is judged;
(5) selecting a1 × 10k Ω grade in a resistor array (0-10) × 10k Ω, judging wrong wiring conditions such as 'polarity reversal' and 'transformation ratio error' of a test line, if the 'polarity reversal' or 'transformation ratio error' is detected, quickly adjusting a test power supply of a current comparator to enable the current percentage of a check meter to be 0.0%, checking the wiring of the current comparator, and retesting; if the 'polarity reversal' or 'transformation ratio error' does not exist, the next step can be carried out;
(6) closing 1 × 10k Ω grade in the resistor array (0-10) × 10k Ω, selecting 1 × 100k Ω grade in the resistor array (0-10) × 100k Ω grade, judging the change of injection current Δ I, and executing the next step if Δ I is increased; if the current Δ I becomes small, the polarity of the in-phase component Ig is judged to be "+" or "-" at 1 × 100k Ω, and the polarity of the quadrature component Ic is judged to be "+" or "-" at 1 × 0.1 μ F; after the polarity is determined, sequentially selecting a resistor array (2-9) multiplied by 100k omega, and comparing a delta I of a next gear with a delta I of a previous gear until the delta I of the next gear is larger than the delta I of the previous gear; similarly, selecting a capacitor array (2-9) multiplied by 0.1 muF gear, comparing the delta I of the next gear with the delta I of the previous gear until the delta I of the next gear is larger than the delta I of the previous gear, determining a resistance value and a capacitance value, and executing the next step;
(7) sequentially selecting a resistor array (9-0) multiplied by 1M omega gear, and comparing a delta I of a next gear with a delta I of a previous gear until the delta I of the next gear is larger than the delta I of the previous gear; similarly, selecting a capacitor array (9-0) multiplied by 0.01 muF gear, comparing the delta I of the next gear with the delta I of the previous gear until the delta I of the next gear is larger than the delta I of the previous gear, determining a resistance value and a capacitance value, and executing the next step;
(8) sequentially selecting a resistor array (9-0) multiplied by 10M omega gear, and comparing a delta I of a next gear with a delta I of a previous gear until the delta I of the next gear is larger than the delta I of the previous gear; similarly, selecting a capacitor array (9-0) multiplied by 1nF gear, comparing the delta I of the next gear with the delta I of the previous gear until the delta I of the next gear is larger than the delta I of the previous gear, and determining a resistance value and a capacitance value;
(9) and (3) error calculation:
from the principle of fig. 2, it can be seen that: Δ Ix = -Ig = Ug × G, Δ Iy = -Ic = Uc × ω C;
in-phase component f = [ Delta ] Ix/I2Quadrature component δ =Δiy/I2
Such as: the resistance array (0-10) x 10k omega is 0, the resistance array (0-10) x 1M omega is 1, the resistance array (0-10) x 10M omega is 2, and the polarity is "-"; when the capacitance array (0-10) x 0.1 μ F is 0, (0-10) x 0.01 μ F is 2, (0-10) x 1nF is 3 polarity "+", G =1.2 x 10 nF-6S，C=0.023×314.159×10-6=7.225657×10-6F, then delta Ix = -0.12 x 10-6，△Iy=+0.03183×7.225657×10-6=+0.23×10-6So the in-phase component f =:Δix/I2=-0.12×10-6Quadrature component δ =Δiy/I2=+0.23×10-6rad。
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides a self-balancing comparator formula mutual-inductor check gauge, includes central control unit, with central control unit electric connection's display terminal and communication module to and the power module for each module power supply, its characterized in that still includes:
the I/V conversion unit converts the working current of the current comparator into working voltage through a sampling resistor r of 0.1 omega;
a voltage transformer converting a working voltage into an in-phase voltage and a quadrature voltage having polarities;
the resistance-capacitance shunt unit is electrically connected with the digital nanoampere meter and the voltage transformer, the resistance-capacitance shunt unit converts the in-phase voltage and the orthogonal voltage into an in-phase component Ig and an orthogonal component Ic respectively, the in-phase component Ig and the orthogonal component Ic and the difference current delta I are injected into the same current node A1 and input into the digital nanoampere meter;
the digital nanoampere meter is communicated with the central control unit through the A/D, is used for judging the current injected into the current node A1 and feeds back the current to the resistance-capacitance shunt unit through the central control unit;
the I/V conversion unit comprises a sampling resistor r which is connected in parallel with the To end and the Tx end of the working current input end of the current comparator;
the voltage transformer comprises a coil group A connected into a current comparator To and a Tx end, and a coil winding a' and a coil winding a ″ which serve as output ends;
the resistance-capacitance shunt unit comprises an in-phase electronic switch Kf, an adjustable resistor G, an orthogonal electronic switch K delta and an adjustable capacitor C, wherein the in-phase electronic switch Kf and the adjustable resistor G are connected in series, the in-phase electronic switch Kf is connected to a polarity end ' + ' of a coil winding a ', the orthogonal electronic switch K delta and the adjustable capacitor C are connected in series, the electronic switch K delta is connected to a polarity end ' + ' of a coil winding a ' ', the adjustable resistor G, the adjustable capacitor C and a K end of a differential current delta I are connected to a current node A1, and a D end of the differential current delta I is connected to a central point G of the coil winding a ' and a ' ' through a normally closed contact of a relay J1 and a central point G of the coil winding a '0The terminal K of the difference current delta I is connected with the normally open contact of the relay J1, the terminal D is connected with the common contact of the relay J1, and the normally closed contact of the relay J1 is connected with the central point G0The current node A1 is connected to a digital nanoampere meter, and the adjustable resistor G and the adjustable capacitor C are adjusted to enable the current of the current node A1 to be less than 0.1 nA;
the digital nanoammeter comprises a resistor R, an operational amplifier, a resistor R3, a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2, wherein the resistor R is connected between K 'and D' ends of the digital nanoammeter, the K 'is connected with a current node A1, and the D' end is connected with a central point G of a voltage transformer0The operational amplifier is connected to the K' end and the grounding point, the head end and the tail end of the resistor R3 are respectively connected with the Vp end and the Vo end of the operational amplifier, the Vo end of the operational amplifier is connected with the head end of the resistor R1, and the tail end of the resistor R1 is connected with the capacitor C1The head ends are connected, the tail end of the capacitor C1 is connected with the D 'end, meanwhile, the head end of the capacitor C2 is connected with the tail end of the resistor R1, the tail end of the capacitor C2 is connected with the head end of the resistor R2, the tail end of the resistor R2 is connected with the D' end, and the line output ends of K 'and D' are connected with A/D;
the resistor R = 1K-10K, the resistor R3= 0.1K-100K, the resistor R1=1K, the resistor R2= 1K-100K, the capacitor C1=100 mu F and the capacitor C2=0.1 mu F.
2. The self-balancing comparator type transformer calibrator according to claim 1, wherein: the in-phase electronic switch Kf and the orthogonal electronic switch K delta are in an Omron G3VM model, the relay J1 is in a DS2Y-12 model, the operational amplifier is in an OPA140 model, and the A/D chip is in an AD7606 model.
3. The self-balancing comparator-type transformer calibrator of claim 1, wherein: the central control unit adopts an STM32 system MCU and a 32-bit high-performance processor.
4. The self-balancing comparator-type transformer calibrator of claim 1, wherein: the display terminal is connected with the central control unit through a modbus communication protocol.
5. The self-balancing comparator-type transformer calibrator of claim 1, wherein: the power module supplies power through an AC/DC circuit and an internal lithium battery, and the capacity of the lithium battery is more than or equal to 16.8V by 7.5 Ah;
the lithium battery converts DC16.8V power into DC12V power through a DC/DC circuit to supply power for the display terminal and the electronic switch, and converts the power into DC5V power to supply power for the electronic circuit and the central control unit.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114200379A (en) * | 2021-12-02 | 2022-03-18 | 山西互感器电测设备有限公司 | Self-balancing comparator type mutual inductor calibrator and testing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114200379A (en) * | 2021-12-02 | 2022-03-18 | 山西互感器电测设备有限公司 | Self-balancing comparator type mutual inductor calibrator and testing method thereof |
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