CN109142843A - A kind of portable Intelligent Measure and Control Instrument - Google Patents
A kind of portable Intelligent Measure and Control Instrument Download PDFInfo
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- CN109142843A CN109142843A CN201810710240.9A CN201810710240A CN109142843A CN 109142843 A CN109142843 A CN 109142843A CN 201810710240 A CN201810710240 A CN 201810710240A CN 109142843 A CN109142843 A CN 109142843A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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Abstract
The invention discloses a kind of portable Intelligent Measure and Control Instruments, including magnetism gathering rings, the surface of magnetism gathering rings is uniformly wound with coiling, current line to be measured is provided at the geometric center of magnetism gathering rings, annular Induced magnetic field is generated around current line to be measured after energization, magnet ring gap is provided on magnetism gathering rings, magnet ring is provided with magnetoresistive sensor in gap, the input power for magnetoresistive sensor work is connected on magnetoresistive sensor, the output end of magnetoresistive sensor is connected with amplifying circuit, the output end of amplifying circuit is connected with signal processing circuit, the output end of signal processing circuit is connected with Voltage-current conversion circuit, feedback current line is connected between the output end and coiling of Voltage-current conversion circuit, the other end of coiling is connected with sampling resistor, ADC sample circuit is provided on sampling resistor, the output end of ADC sample circuit is connected with Display module, Measure Precision of the present invention is high, and small to be easy to carry about with one, measurement result is electronically shown, meets existing to industrial requirement.
Description
Technical field
The present invention relates to current instruments technical field, specially a kind of portable Intelligent Measure and Control Instrument.
Background technique
Smart grid is efficient, a cleaning, economic, intelligence modern power industry network, is that the development of the following power grid becomes
Gesture.The realization of smart grid needs the support of each side's surface technology, wherein advanced sensing is to realize real-time monitoring with measuring technique
With the basis of failure predication.And in the numerous state characteristics of smart grid, most importantly key node and the voltage of equipment,
Electric current real time information.Electric current in smart grid covers a wide range, and amplitude Wan An, frequency coverage from tens microamperes to tens is straight
It flows and power frequency to several hundred kHz.Current sensor will not only have wider response band and biggish dynamic range, also have
The performances such as very high insulation, electromagnetic compatibility.It mainly include at present shunt resistance applied to the current measure device in smart grid
(Shunt), current transformer, Rogowski coil, Hall current sensor (Hall), fibre optic current sensor (FOCT),
Fluxgate current sensor (Flux gate) etc., but these sensors are difficult to meet above-mentioned technical need comprehensively.But it compares
Under, the current sensor based on giant magnetoresistance effect (GMR) has small in size, highly sensitive, high-precision, Wide measuring range, height
Can integrated level, low cost, the comprehensive advantages such as direct current and alternating current can be measured.
Giant magnetoresistance (GMR) current sensor is based on giant magnetoresistance effect, until Fei Er in 1988 and Green Bei Geer discovery is huge
Magnetoresistance, due to giant magneto-resistance sensor volume, sensitivity, in terms of tool have great advantage, giant magneto-resistance sensor obtains
Extensive utilization, such as displacement measurement, the fields such as tachometric survey, Electric control, fast control, navigation, medical treatment are arrived.Giant magnetoresistance sensing
The working principle of device is giant magnetic resistance in a certain range under the action of magnetic field, and resistance value can generate phase with the variation in magnetic field
The variation answered calculates the size in magnetic field according to the variation of resistance value, to calculate tested electric current.It is huge in terms of current detecting
The other kinds of current sensor of magneto-resistive current sensor is compared, have can measure direct current and AC signal, the linearity it is good and
The advantages that small in size, especially GMR, can measure DC current.
In estimated current transducer market, Hall sensor occupies leading position.Current sensor based on giant magnetoresistance is also
In development phase.Giant magneto-resistance sensor relative to Hall sensor principle difference so that giant magnetoresistance is in sensitivity, pressure resistance
Ability, measurement accuracy, temperature stability and linearity etc. have very big advantage.The influence of high-precision bring is mainly more held
Vulnerable to the interference of external environment, more sensitive to position, so that the giant magneto-resistance sensor parameter of same model all not necessarily phases
Together, higher to the requirement of shield technology, how to solve offset and sensitivity different problems in batch production process is to grind
The emphasis studied carefully.
But the existing Intelligent Measure and Control Instrument for surveying electric current still has following defect:
The current sensor of existing giant magnetoresistance can relatively accurately realize contactless measurement electric current, open loop type
Current sensor can measure the current sensor of larger current closed loop, and although measuring, electric current is smaller, and feedback response is smart fastly
Degree is high, can realize the portable feature of the small bodily form, but existing sensing chip mostly uses the means of shielded layer covering, gathers
At half-bridge mode, precision differs one times with respect to full-bridge mode, and when measuring the magnetic field perpendicular to sensor orientation again not compared with
Good solution, and existing magnetic flux guiding device is located at the setting above resistance, increases the volume of sensor itself, institute
Traditional ammeter is replaced to be badly in need of a kind of observing and controlling ammeter of small bodily form of high-precision.
Summary of the invention
It, can be effective in order to overcome the shortcomings of that prior art, the present invention provide a kind of portable Intelligent Measure and Control Instrument
Solve the problems, such as that background technique proposes.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of portable Intelligent Measure and Control Instrument, including magnetism gathering rings, the surface of the magnetism gathering rings are uniformly wound with coiling, institute
It states and is provided with current line to be measured at the geometric center of magnetism gathering rings, annular is generated around the current line to be measured after energization and is inducted
Magnetic field is provided with magnet ring gap on the magnetism gathering rings, magnetoresistive sensor, the magnetoresistive sensor is provided in the magnet ring gap
On be connected with for magnetoresistive sensor work input power, the output end of the magnetoresistive sensor is connected with amplifying circuit, described
The output end of amplifying circuit is connected with signal processing circuit, and the output end of the signal processing circuit is connected with voltage and turns electric current electricity
Road is connected with feedback current line, the coiling between the output end of the Voltage-current conversion circuit and the coiling
The other end be connected with sampling resistor, ADC sample circuit, the output of the ADC sample circuit are provided on the sampling resistor
End is connected with display module.
Further, the magnetism gathering rings select relative permeability be in-between iron nickel molybdenum magnet ring or Sendust Cores.
Further, the amplifying circuit includes operational amplification circuit and power amplification circuit.
Further, the signal processing circuit includes zeroing circuit and the full circuit of tune.
Further, the DC power supply that the input power is worked normally using magnetoresistive sensor is provided.
Further, the magnetoresistive sensor includes silicon-based substrate, is provided with rectangular-shape above the silicon-based substrate
Magnetic flux guiding device and four identical mistors, the mistor is average and is equidistantly disposed on the magnetic flux guiding device
The left and right sides.
Further, the silicon-based substrate is made of silica, silicon or magnesium oxide material.
Further, the mistor selects anisotropic magnetoresistance, giant magnetoresistance or tunneling junction magnetoresistive.
Further, the magnetic flux guiding device is made of ferronickel material.
Compared with prior art, the beneficial effects of the present invention are:
The present invention measures electric current to be measured, Er Qieqing in such a way that entire measure and control instrument is using closed loop feedback and self leveling
Show clearly on a display screen, entire instrument exquisiteness is small and exquisite, and the high feedback response of precision is fast, and silicon-based substrate perpendicular to magnetic field
Test format, change existing Magnetic Sensor and be difficult to fixed situation, meet wanting for the technique of modern microelectronic industry
It asks, the push-pull configuration that the leakage field by measuring flux guide is formed on Wheatstone bridge can accurately measure tested magnetic field
Size.Entire measure and control instrument obtains components all towards miniaturization, and portable, high-precision direction strides forward, and solves background skill
Art proposes to obtain problem.
Detailed description of the invention
Fig. 1 obtains overall structure diagram to be of the invention；
Fig. 2 is operational amplification circuit schematic diagram of the invention；
Fig. 3 is power amplification circuit schematic diagram of the invention；
Fig. 4 is Voltage-current conversion circuit schematic diagram of the invention；
Fig. 5 is zeroing circuit schematic diagram of the invention；
Fig. 6 is that the present invention adjusts full circuit diagram；
Fig. 7 is this hair magnetoresistive sensor schematic diagram of internal structure；
Fig. 8 is the schematic diagram that mistor of the present invention receives magnetic flux guiding device magnetic conduction direction；
Fig. 9 is the electric bridge schematic diagram of mistor of the present invention connection.
Figure label:
1- magnetism gathering rings；2- coiling；3- current line to be measured；4- Induced magnetic field；5- magnetoresistive sensor；6- magnet ring gap；
7- amplifying circuit；8- signal processing circuit；9- Voltage-current conversion circuit；10- input power；11- feedback current；12- sampling electricity
Resistance；13-ADC sampling；14- display module；
501- mistor R1；502- mistor R2；503- mistor R3；504- mistor R4；505- silicon substrate
Substrate；506- magnetic flux guiding device.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment
As shown in Figure 1, include magnetism gathering rings 1 the present invention provides a kind of portable Intelligent Measure and Control Instrument, the magnetism gathering rings 1
Surface is uniformly wound with coiling 2, and current line 3 to be measured is provided at the geometric center of the magnetism gathering rings 1, after energization it is described to
It surveys and generates annular Induced magnetic field 4 around current line 3, be provided with magnet ring gap 6 on the magnetism gathering rings 1, in the magnet ring gap 6
It is provided with magnetoresistive sensor 5, the input power 10 to work for magnetoresistive sensor 5, the magnetic are connected on the magnetoresistive sensor 5
The output end of resistance sensor 5 is connected with amplifying circuit 7, and the output end of the amplifying circuit 7 is connected with signal processing circuit 8, institute
The output end for stating signal processing circuit 8 is connected with Voltage-current conversion circuit 9, the output end of the Voltage-current conversion circuit 9 and institute
It states and is connected with feedback current line 11 between coiling 2, the other end of the coiling 2 is connected with sampling resistor 12, described
ADC sample circuit 13 is provided on sampling resistor 12, the output end of the ADC sample circuit 13 is connected with display module 14.
A specific embodiment of the invention and measuring principle are that major function of the present invention is the electric current in measure traverse line,
What is taken is untouchable measurement, and precision is high, and response is fast.Current line 3 to be measured first is passed through electric current to be measured, when electric current to be measured is straight
The case where stream:
The principle of toroidal magnetic field is generated it is found that generating stable annular magnetic around direct current electric current to be measured according to current in wire
, the Induced magnetic field Induced magnetic field 4 of the annular will receive the magnet accumulating cap of magnetism gathering rings 1, and gathering to obtain magnetic field can be along 1 shape of magnetism gathering rings
The polymerization toroidal magnetic field of Cheng Xin is provided with magnet ring gap 6 on magnetism gathering rings 1, after polymerization magnetic field can generate leakage in magnet ring gap 6
Magnetic, is arranged magnetoresistive sensor 5 in magnet ring gap 6 at this time, and magnetoresistive sensor 5 can obtain size and basis according to accurate perception leakage field
The characteristics of magnetoresistive sensor 5, will perceive to obtain leakage field formation differential voltage signal output.Because the opening of magnet ring gap 6 is almost parallel
Section, so leakage field is almost uniform magnetic field.
Magnetoresistive sensor 5 perceive leakage field formed differential voltage signal output after first pass around amplifying circuit 7, first through row press
Value amplification is again through row power amplification.The reason of carrying out operation amplifier is that the differential signal that magnetoresistive sensor 5 generates belongs to small letter
The measurement difficulty of number tiny signal is big, and relative error is big, and amplified signal needs convenient for measurement to entire coiling
If 2 offer feedback current feedback current underpowers can not drive loading coil, so needing to carry out power amplification.
For amplified signal again by being handled in signal processing circuit 8, main function is to reduce measurement and miss
Difference needs to carry out zeroing operation to circuit.So-called zeroing is exactly to make system when not working, output voltage zero.And it adjusts full
It is the big output for control system, makes it guarantee to be unlikely to overtension in normal working condition and the damage that leads to system
Go bad and cause unnecessary error.It not only needs to carry out circuit zeroing and also needs to carry out that circuit tune is full, the purpose for adjusting full circuit is
The big voltage of limiting circuit.It adjusts for the limitation of subsequent collection voltages.
Treated signal is again by Voltage-current conversion circuit 9.The above-mentioned signal mentioned after signal processing is still
Voltage signal, however in order to reach the feedback effects of system, the feedback signal of secondary output should be and be measured identical electricity
Flow signal.So, it should the voltage signal after signal processing is converted into current signal, is then used further to measured feedback
Compensation, the method used is Voltage-current conversion circuit.Voltage turns electric current as its name suggests to be exactly to be the voltage signal conversion that will be inputted
It is voltage-controlled current source at the circuit of current signal.
In Industry Control Application circuit, when analog signals export, usually with voltage output.With voltage system it is long away from
When from transmission of analogue signal, signal resistance or the D.C. resistance of transmission line etc. will lead to voltage attenuation, and signal receives
The input resistance at end is lower, and voltage attenuation is bigger.In order to avoid decaying of the signal in transmission process, connect to increase signal
The input resistance of receiving end, but the increase of signal receiving end input resistance make the reduction of transmission line interference free performance so that vulnerable to
External interference, signal transmission is unstable, when such long distance transmission analog signal, cannot use the voltage way of output, and electricity
Pressure output is converted into electric current output.In addition again in regular industrial instrument, also require output end that voltage is defeated with current system mating
It is converted into electric current output out.V/I converter is exactly that voltage output signal is converted into current output signal, be conducive to Chief Signal Boatswain away from
From transmission.V/I converter can be made of a variety of devices such as transistor.Effect in the present invention is the electric current letter fed back in order to obtain
Number compensation.
After Voltage-current conversion circuit 9 current signal driving load coiling 2 so that coiling 2 generate with
The contrary magnetic field of the Induced magnetic field 4 that current line 3 to be measured generates, the feedback magnetic field are acted on by the polymerization of magnetism gathering rings 1
It on the magnetic field originally polymerizeing, offsets each other, until the difference that the magnetic flux in coil in former magnetic field is zero, and sensor generates at this time
Component voltage is also zero, once electric current to be measured changes, sensor generates differential voltage again, then offsets again, this process
It is a dynamic balance.It is calculated according to existing it is found that coil turn multiplies coil current equal to size of current to be measured.Enable coil
The number of turns NP, coil current IP, electric current I to be measured then have, IP*NP=I；
When needing measure coil currents (IP), needs to measure the voltage value of sampling resistor 12 indirectly, obtained by Ohm's law
To the electric current for flowing through resistance, for the ease of display, the present invention utilizes ADC collection voltages signal on sampling resistor 12, then utilizes
Display module 14 shows in general display module is exactly display screen.Entire measure and control instrument using closed loop feedback and self
The mode of leveling measures electric current to be measured, and is most clearly shown on display screen, and entire instrument exquisiteness is small and exquisite, and precision high feedback is rung
It should be fast.
When electric current to be measured be exchange the case where:
When electric current to be measured is alternating current, similarly current line to be measured generates the toroidal magnetic field of direction change, the magnetic field meeting
Assembled by magnetism gathering rings 1, and is perceived and generated by magnetoresistive sensor 5 differential voltage of variation, the subsequent processing electricity of the differential voltage
Road is identical as the differential voltage that DC current generates, whole process although identical and feedback equalization time also when very short
Interior completion general 0.2 is each delicate, it is contemplated that the porcelain of magnetic resistance itself acts on, measure and control instrument of the invention is in measurement Gao Ping
The precision of the alternating current of rate is compared to wanting poor for DC current.It is of the invention in the case where inaccurate measurement for after all
Measure and control instrument is also relatively accurate in the measurement of alternating current.
As shown in Figure 1, heretofore described magnetism gathering rings 1 select relative permeability to be in the iron nickel molybdenum magnet ring between 14-150
Or Sendust Cores.
Iron sial and iron nickel molybdenum have very high magnetic conductivity, lower core loss, stablize, saturation magnetic field intensity it is big,
Theoretically all meet design requirement.Furthermore iron powder, ferrite, either magnetic conductivity is insufficient or saturation magnetic field intensity mistake for iron silicon materials
It is small, it is unable to satisfy testing requirement.
As shown in Figure 1, the direct current that heretofore described input power 10 is worked normally using magnetoresistive sensor 5 is provided
Source.
Because magnetoresistive sensor 5 needs DC power supply to power to it just in the course of work to be worked normally.
As shown in Figure 2 and Figure 3, heretofore described amplifying circuit 7 includes operational amplification circuit and power amplification circuit.
So-called operational amplification circuit, main function are output voltage and the reduction null offset for amplifying giant magneto-resistance sensor.
The output voltage signal of giant magneto-resistance sensor only has tens millivolts, and signal is weaker.Only tens millivolts of output obviously can not be direct
Using needing to amplify it processing, it is therefore necessary to add level-one amplifying circuit.The operational amplifier used in design is
AD620, it has the characteristics that low in energy consumption, noise is low and with high accuracy, its input stage uses the processing mode of Super Beta, this
So that chip realizes low input bias current.AD620 is generally used for the preposition amplification of system, and effect is fine, is to acquire accurate number
According to the first choice of system.
The amplification factor of AD620 be it is adjustable, adjust amplification factor by changing resistance, amplification factor is 1 to 1000
Times.The relationship of amplification factor G and adjustable resistance RG is G=49.4/RG+1.The specific method for improving null offset is: testing
Before beginning, if output voltage is not equal to zero, the size for changing VREF by adjusting Z2 makes V0 be zero.Which
Null offset can be theoretically completely eliminated, but is influenced when practical operation by the precision of potentiometer, zero point drift can be obviously improved
Shifting cannot be completely eliminated, and measurement process inevitably has error.
Out voltage signal is by after operational amplifier, can not drive feedback circuit since output signal power is too small
Load, needs at this time plus a power amplifier carries out power amplification, so that feed circuit is reached normal work, needs to carry out power and put
Greatly.Using the power amplifier of integrated form in the present invention, model LM3886TF, insulation-encapsulated, power supply is simple, distortion compared with
It is small, output power, can -20 DEG C~80 DEG C at a temperature of work normally, overvoltage protection, overcurrent protection function are complete, external
Simply, easy to use.Power amplification effectively can be realized to signal.
As shown in figure 4, heretofore described Voltage-current conversion circuit 9, introduces negative-feedback in circuit, A constitutes same phase
Summation operation circuit B constitutes voltage follower.Secondary current output can be obtained and connect to obtain 300K divided by rear end for circuit differential voltage
Resistance obtains electric current after being converted.
As shown in figs. 5 and 6, heretofore described signal processing circuit 8 includes zeroing circuit and the full circuit of tune.
By above-mentioned known zeroing circuit for reducing null offset, the full circuit of tune is subsequent that ADC sampling is prepared, limitation
Upper voltage limit is obtained in circuit.
Master chip in zeroing circuit circuit is TL082, is an amplifier chip, mainly amplifies the electricity between 2,3 pins
Potential difference.It is poor that magnetic field output potential is experienced by magnetoresistive sensor, after amplifying circuit, is input to amplifier chip in circuit
3 pins of TL082.Then adjusting sliding variable resistance makes the size one exported on the voltage swing and 3 pins of 2 pins of amplifier chip
Sample, the potential difference on chip between 2,3 pins is zero at this time, and 1 pin does not have voltage output.It ensure that system output is zero.
Similarly adjust using two TL082 chips of concatenation in full circuit, guarantee limit output voltage is 3V.
As illustrated in figs. 7 and 8, heretofore described magnetoresistive sensor 5 includes silicon-based substrate 505, the silicon-based substrate 505
Top is provided with the magnetic flux guiding device 506 and four identical mistors of rectangular-shape, and the mistor is average and equidistant
The left and right sides of the magnetic flux guiding device 506 is arranged in ground.
Mistor change procedure is, when the magnetic field perpendicular to silicon-based substrate 505 directly acts on mistor, four
Mistor generates identical variation, the positive and negative magnetic charge but the upper and lower surfaces of magnetic flux guiding device 506 are inducted respectively, magnetic flux guidance
The mistor of 506 left and right sides of device experiences leakage field caused by positive and negative magnetic charge respectively, so that 506 two sides side of magnetic flux guiding device
Mistor, side resistance value increase, and other side resistance value reduces.
506 left and right sides mistor 3 of magnetic flux guiding device generates different variations, 506 left side magnetosensitive electricity of magnetic flux guiding device
Resistance R1501 and mistor R3503 experience negative fluxfield, 506 right side mistor R2502 of magnetic flux guiding device and mistor
R4504 experiences positive flux field, and four mistors connect to form a Wheatstone bridge, mistor R1501 and mistor
The upper termination power of the junction R2502, mistor R4504 and the junction mistor R3503 are grounded, and mistor is by magnetic
The influence of logical 506 upper and lower surfaces magnetic charge of guiding device, (assuming that the positive magnetic charge upper surface distribution of 506 following table EDS maps of magnetic flux guiding device
Negative magnetic charge, mistor oneself height are ignored, and 506 bottom end cloth member height of magnetic flux guiding device is ignored, and approximation regards magnetic flux guiding device as
506 same planes where with mistor.) available net magnetic field strength, K is the sensitivity of magnetic induction, and H+ is positive magnetic charge
Field strength, H- are negative the field strength of magnetic charge, and the be negative line of magnetic induction angle of magnetic charge generation of θ is θ.506 left and right ends of magnetic flux guiding device
Magnetic field size suffered by mistor is identical, and direction is different, so obtaining different resistance variations, different resistance variations are in electric bridge
Middle formation push-pull configuration obtains differential output voltage VOUT.VOUT obtains final output signal by subsequent signal processing.
The leakage field situation for obtaining magnetic flux guiding device 506 can be emulated by output signal, and then obtains magnetic field size to be measured.
As illustrated in figs. 7 and 8, silica, silicon or magnesium oxide material system can be used in heretofore described silicon-based substrate 505
At.
As illustrated in figs. 7 and 8, heretofore described magnetic flux guiding device 506 is made of ferronickel material.
Ferronickel material, which is that magnetic conduction ability is preferable, obtains one of soft magnetic materials, is suitable as magnetic flux guiding device 506.
As shown in Figure 7, Figure 8 and Figure 9, anisotropic magnetoresistance, giant magnetoresistance can be selected in heretofore described mistor
Or tunneling junction magnetoresistive.Different magnetoresistances, which all can serve as mistor in the present invention, to be selected, not only giant magnetoresistance
Effect.But mistor is obtained in the present invention in narration and uses to be giant magnetoresistance.And as shown in electric bridge, it is distributed in the magnetic
Logical guiding device two sides obtain mistor and change two identical, side increases, side reduction.
The advantage of the invention is that entire measure and control instrument measures electric current to be measured by the way of closed loop feedback and self leveling,
And be most clearly shown on display screen, entire instrument exquisiteness is small and exquisite, and the high feedback response of precision is fast, and silicon-based substrate perpendicular to
Magnetic field test format, change existing Magnetic Sensor and be difficult to fixed situation, meet the work of modern microelectronic industry
The requirement of skill, the push-pull configuration that the leakage field by measuring flux guide is formed on Wheatstone bridge can accurately measure quilt
Survey the size in magnetic field.Entire measure and control instrument obtains components all towards miniaturization, and portable, high-precision obtains direction and strides forward, and solves
Background technique proposes to obtain problem.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
Claims (9)
1. a kind of portable Intelligent Measure and Control Instrument, it is characterised in that: including magnetism gathering rings (1), the surface of the magnetism gathering rings (1) is uniform
It is wound with coiling (2), is provided with current line to be measured (3) at the geometric center of the magnetism gathering rings (1), it is described to be measured after energization
Annular Induced magnetic field (4) is generated around current line (3), is provided with magnet ring gap (6), the magnet ring on the magnetism gathering rings (1)
It is provided with magnetoresistive sensor (5), is connected on the magnetoresistive sensor (5) for the defeated of magnetoresistive sensor (5) work in gap (6)
Enter power supply (10), the output end of the magnetoresistive sensor (5) is connected with amplifying circuit (7), the output end of the amplifying circuit (7)
It is connected with signal processing circuit (8), the output end of the signal processing circuit (8) is connected with Voltage-current conversion circuit (9), described
It is connected with feedback current line (11) between the output end and the coiling (2) of Voltage-current conversion circuit (9), the coiling line
The other end of circle (2) is connected with sampling resistor (12), is provided with ADC sample circuit (13) on the sampling resistor (12), described
The output end of ADC sample circuit (13) is connected with display module (14).
2. the portable Intelligent Measure and Control Instrument of one kind according to claim 1, it is characterised in that: the magnetism gathering rings (1) are selected
Relative permeability is in iron nickel molybdenum magnet ring or Sendust Cores between 14-150.
3. the portable Intelligent Measure and Control Instrument of one kind according to claim 1, it is characterised in that: amplifying circuit (7) packet
Include operational amplification circuit and power amplification circuit.
4. the portable Intelligent Measure and Control Instrument of one kind according to claim 1, it is characterised in that: the signal processing circuit
It (8) include zeroing circuit and the full circuit of tune.
5. the portable Intelligent Measure and Control Instrument of one kind according to claim 1, it is characterised in that: the input power (10) is adopted
It is to provide the DC power supply of magnetoresistive sensor (5) normal work.
6. a kind of portable Intelligent Measure and Control Instrument according to claim 1 or 5, it is characterised in that: the magnetoresistive sensor
(5) include silicon-based substrate (505), the magnetic flux guiding device (506) and four of rectangular-shape is provided with above the silicon-based substrate (505)
A identical mistor, the mistor is average and is equidistantly disposed on the left and right sides of the magnetic flux guiding device (506).
7. the portable Intelligent Measure and Control Instrument of one kind according to claim 6, it is characterised in that: the silicon-based substrate (505)
It is made of silica, silicon or magnesium oxide material.
8. the portable Intelligent Measure and Control Instrument of one kind according to claim 6, it is characterised in that: the mistor is selected each
Anisotropy magneto-resistor, giant magnetoresistance or tunneling junction magnetoresistive.
9. the portable Intelligent Measure and Control Instrument of one kind according to claim 6, it is characterised in that: the magnetic flux guiding device
(506) it is made of ferronickel material.
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| CN201810710240.9A CN109142843A (en) | 2018-07-02 | 2018-07-02 | A kind of portable Intelligent Measure and Control Instrument |
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| CN201810710240.9A CN109142843A (en) | 2018-07-02 | 2018-07-02 | A kind of portable Intelligent Measure and Control Instrument |
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| CN113109616A (en) * | 2021-04-27 | 2021-07-13 | 杭州电子科技大学 | Closed-loop current sensor based on magnetic shunt structure |
| CN113517122A (en) * | 2021-04-19 | 2021-10-19 | 浙江天际互感器有限公司 | PCB type current transformer with correction function |
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| CN114689925A (en) * | 2022-05-31 | 2022-07-01 | 陕西半导体先导技术中心有限公司 | Isolated transient short-circuit current testing system and method |
| CN114689925B (en) * | 2022-05-31 | 2022-09-20 | 陕西半导体先导技术中心有限公司 | Isolated transient short-circuit current testing system and method |
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