CN110146737A - A kind of wide range current sensor based on shunt magnetic structure - Google Patents
A kind of wide range current sensor based on shunt magnetic structure Download PDFInfo
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- CN110146737A CN110146737A CN201910448601.1A CN201910448601A CN110146737A CN 110146737 A CN110146737 A CN 110146737A CN 201910448601 A CN201910448601 A CN 201910448601A CN 110146737 A CN110146737 A CN 110146737A
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- magnetic
- magnet ring
- guiding device
- flux guiding
- flow dividing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
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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
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention discloses a kind of wide range current sensors based on shunt magnetic structure, including printed circuit board, magnet ring, flow dividing structure, four operational amplifiers, multichannel ADC, MCU and display screen, magnetic core mounting groove is provided on printed circuit board, the fixed level of magnet ring is embedded in magnetic core mounting groove, magnet ring gap is offered on magnet ring, flow dividing structure is arranged in magnet ring gap, flow dividing structure includes two fixed frames made of non-magnetic material, magnetic flux guiding device and four identical magnetic sensor chips, magnet ring gap location is generated into leakage field using flow dividing structure and carries out shunt magnetic processing, so that the magnetic field for four identical magnetic sensor chip detections being placed at left and right sides of magnetic flux guiding device substantially reduces, realize the function of checking of great current；The present invention shunts the method for replacing traditional coil type measurement high current using magnetic circuit, reduces the energy consumption of coil drive, efficiently solves the problems, such as the big power consumption of existing large current sensor.
Description
Technical field
The present invention relates to current sensing techniques field, specially a kind of wide range current sense based on shunt magnetic structure
Device.
Background technique
Current sensor is generally used in the actual measurement and protection system of electric current such as: photovoltaic, wind-powered electricity generation, metallurgy, electric power,
Oil field, smart grid, railway locomotive, power supply, space flight, military project, distribution from move, steamer, civilian field irrigation, mine, Internet of Things
Net etc. many industries, current sensor play the role of vital wherein as main detecting element.
Current sensor measurement electric current principle is that measured wire passes through magnet ring, generates magnetic field, magnet ring around electrified wire
Effect be that magnetic field is gathered together.Air gap on magnet ring is used to embedding sensor chip, and the operating voltage of sensor is by external electrical
Road provides, and magnetic field signal is converted to voltage signal and is output to external amplifying circuit and signal processing circuit by sensor.Magnetic field
Intensity is directly proportional to the size of tested electric current, and sensor output voltage is linear with magnetic field strength.Therefore the output of sensor
Voltage is directly proportional to tested electric current.Magnetic Sensor sensitivity at present is very high, is able to detect the magnetic field of very little in environment, including earth magnetism
The presence in field and some weaker magnetic fields, these interference can generate a null offset, will affect measurement result, subsequent place
Reason circuit is primarily used to reduce these errors.Some faint electric currents are being measured, can surveyed in such a way that multiturn measures to reduce
Error is measured, the measurement range of open loop giant magneto-resistance sensor depends on the linear operating region of giant magnetoresistance.
Current large current sensor has important application in smart grid, power station and numerous high-power industry.It is existing
Some large current sensors generally use mutual inductance technology, current transformation technology or current splitting techniques etc., although having reached big
The purpose of current measurement, but the driving of multiple groups coil causes great power consumption.Such as Publication No. CN101650383A, title
For a kind of patent of invention of large current sensor, which is also that the measurement of high current is obtained in the way of two-stage coil.But
Coil power dissipation problem is difficult to solve.
Summary of the invention
In order to overcome the shortcomings of that prior art, the present invention provide a kind of wide range electric current biography based on shunt magnetic structure
Sensor can effectively solve the problem of background technique proposes.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of wide range current sensor based on shunt magnetic structure, including printed circuit board, magnet ring, flow dividing structure, four
A operational amplifier, multichannel ADC, MCU and display screen.
Magnetic core mounting groove is provided on the printed circuit board, the fixed level of the magnet ring is embedded in magnetic core mounting groove,
Magnet ring gap is offered on the magnet ring, the flow dividing structure is arranged in magnet ring gap；
The flow dividing structure includes two fixed frames made of non-magnetic material, magnetic flux guiding device and four identical magnetic
Sensor chip.
The fixed frame is connected on magnet ring opening inner wall, and the magnetic flux guiding device is strip four prism type, and is arranged
Between two fixed frames, magnetic flux guiding device and the fixed frame form I-shaped structure, and four magnetic sensor chips are divided into
Two groups of left and right sides for being symmetricly set on magnetic flux guiding device, close to magnet ring gap upper surface location two magnetic sensor chips with
Two magnetic sensor chips close to magnet ring gap lower surface position are symmetrical above and below about magnetic flux guiding device horizontal median axis.
Four magnetic sensor chip output ends are both connected on the input terminal of the operational amplifier, four fortune
It calculates amplifier and is commonly connected to multichannel ADC input terminal, the digital signal of multichannel ADC output end output is carried out through the MCU
Digital processing, treated, and signal leads to display screen display output.
Further, the fixed frame is made of heat resistant plastice or aluminium.
Further, the magnetic sensor chip is using spin valve giant magnetoresistance sensing chip, magnetic tunnel-junction sensing chip, each
Anisotropy magnetic sensing chip or fluxgate sensing chip.
Further, the magnetic flux guiding device is made of silicon steel or amorphous & nanocrystalline.
Further, the magnet ring uses circular magnetic loop or square magnetic ring, and magnet ring is by silicon steel, amorphous nano-crystalline or perm
Alloy material is made.
Compared with prior art, the beneficial effects of the present invention are:
The present invention carries out shunt magnetic processing by the way that magnet ring gap location is generated leakage field using flow dividing structure so that is placed on magnetic
The magnetic field of four identical magnetic sensor chip detections at left and right sides of logical guiding device substantially reduces, and realizes the function of checking of great current
Energy；Flow dividing structure is arranged in magnet ring gap, effectively reduces influence of the environmental magnetic field to sensor in flow dividing structure；Benefit of the invention
The method for replacing traditional coil type measurement high current is shunted with magnetic circuit, is reduced the energy consumption of coil drive, is efficiently solved existing
There is the problem of large current sensor big power consumption.
Detailed description of the invention
Fig. 1 is total system schematic diagram of the present invention；
Fig. 2 is the enlarged structure schematic diagram of flow dividing structure of the present invention；
Fig. 3 is flow dividing structure in the present invention to the schematic illustration of magnet ring gap location field shunting.
Figure label:
1- printed circuit board；2- magnet ring；3- flow dividing structure；4- operational amplifier；
101- magnetic core mounting groove；
201- magnet ring gap；
301- fixed frame；302- magnetic flux guiding device；303- magnetic sensor chip.
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, including printing electricity the present invention provides a kind of wide range current sensor based on shunt magnetic structure
Road plate 1, magnet ring 2,3, four operational amplifiers 4 of flow dividing structure, multichannel ADC, MCU and display screen；
Magnetic core mounting groove 101 is provided on the printed circuit board 1, the fixed level of the magnet ring 2 is embedded in magnetic core installation
In slot 101, magnet ring gap 201 is offered on the magnet ring 2, the flow dividing structure 3 is arranged in magnet ring gap 201；
The magnet ring 2 uses circular magnetic loop or square magnetic ring, and magnet ring is by silicon steel, amorphous nano-crystalline or permalloy material
It is made.
As shown in Fig. 2, the flow dividing structure 3 includes two fixed frames 301 made of non-magnetic material, magnetic flux guiding device
302 and four identical magnetic sensor chips 303；
The fixed frame 301 is connected to magnet ring 2 and is open on inner wall, and the magnetic flux guiding device 302 is strip four prism type, and
It is arranged between two fixed frames 301, magnetic flux guiding device 302 and the fixed frame 301 form I-shaped structure, four magnetic
Sensor chip 303 is divided into two groups of left and right sides for being symmetricly set on magnetic flux guiding device 302, close to 201 upper surface of magnet ring gap
Two magnetic sensor chips 303 of position and close to 201 lower surface position of magnet ring gap two magnetic sensor chips 303 about
302 horizontal median axis of magnetic flux guiding device is symmetrical above and below；
Four 303 output ends of magnetic sensor chip are both connected on the input terminal of the operational amplifier 4, four institutes
It states operational amplifier 4 and is commonly connected to multichannel ADC input terminal, the digital signal of multichannel ADC output end output is through the MCU
Digital processing is carried out, treated, and signal leads to display screen display output.
Specific implementation process of the invention is that electric current is passed through at the center of magnet ring 2, and magnet ring 2 gathers the electric current in conducting wire
Collection generates leakage field in magnet ring and at magnet ring gap 201, and the leakage field direction of generation is opposite perpendicular to two of magnet ring gap 201
Face.If the electric current being passed through is larger, the leakage field intensity at magnet ring gap 201 is generally stronger, if therefore directly in magnet ring gap
Magnetic sensor chip 303 is placed at 201, sensing chip will be saturated quickly, it is difficult to realize the measurement of wide range electric current.Therefore benefit
Leakage field will be generated at magnet ring gap 201 with flow dividing structure 3 carry out shunt magnetic processing so that being placed on magnetic flux guiding device 302 or so two
The magnetic field that the identical magnetic sensor chip 303 of four of side detects substantially reduces, and realizes the function of checking of great current.
Four magnetic sensor chips 303 of the invention are in the two sides of magnetic flux guiding device 302, and two groups of magnetic sensor chips
303 is symmetrical about magnetic flux guiding device 302.Assume that the magnetic field in magnet ring gap 201 is direction from bottom to top in the present embodiment, it should
Magnetic field forms the shunting magnetic field of horizontal direction after magnetic flux guiding device 302, and the shunting magnetic field of horizontal direction is through Magnetic Sensor core
Piece 303 forms sensor voltage output after detecting, the output of four magnetic sensor chips 303 leads to multichannel ADC and carries out AD
Transformation, after AD is converted, the analog voltage output signal of magnetic sensor chip 303 is converted into accessible digital signal, should
Digital signal is handled by the multichannel average algorithm that MCU is controlled through row, and treated, and result is shown on a display screen.
The fixed frame 301 is made of heat resistant plastice or aluminium.
The non-magnetic material that fixed frame 301 uses is effectively separated by magnetic flux guiding device 302 and magnet ring 2, avoids magnetic
The purpose that cannot achieve shunt magnetic is connected in road.
The magnetic sensor chip 303 uses spin valve giant magnetoresistance sensing chip, magnetic tunnel-junction sensing chip, anisotropy
Magnetic sensing chip or fluxgate sensing chip.
The magnetic flux guiding device 302 is made of silicon steel or amorphous & nanocrystalline.
Silicon steel or amorphous & nanocrystalline have biggish magnetic saturation range and magnetic conductivity with higher, can effectively put
It sets magnetic flux guiding device 302 to be rapidly saturated, is the necessary condition for guaranteeing to realize measurement wide range electric current.
As shown in figure 3, the specific branching process of flow dividing structure 3 is, it is assumed that magnet ring gap 201 in magnetic field be from lower and
On direction, therefore collect uniform magnetic charge in the front and rear surfaces of magnetic flux guiding device 302, formed and closed between two kinds of magnetic charges of inequality
The circuit of conjunction, therefore most magnetic flux is in magnetic flux guiding device 302, the magnetic field of 302 two sides of magnetic flux guiding device formed it is horizontal and
Vertical both direction the, because of orthogonal (magnetic sensor chip of sensitive axes in the magnetic field of vertical direction and magnetic sensor chip 303
In the horizontal direction, the magnetic sensor chip 303 in 302 left and right sides of magnetic flux guiding device is sensitive for 303 sensitive axis direction settings
Axis direction is mutually 180 °) therefore the magnetic field of vertical direction temporarily ignore, the magnetic sensor chip of 302 left back of magnetic flux guiding device
To the left for level, it is magnetic horizontally to the right that the magnetic sensor chip 303 of left front closes magnetic direction to conjunction magnetic direction suffered by 303
The conjunction magnetic direction that the magnetic sensor chip 303 on logical 302 right side of guiding device is subject to symmetrical left side magnetic sensor chip 303 therewith
On the contrary.Thereby realize four magnetic sensor chips 303 and can generate almost equal defeated of order of magnitude of output voltage
Out, the purpose for realizing shunt magnetic reaches the function of wide range current measurement.
Magnet ring gap location is generated leakage field using flow dividing structure and carries out shunt magnetic processing by the present invention so that is placed on magnetic flux and is drawn
The magnetic field for leading four at left and right sides of device identical magnetic sensor chip detections substantially reduces, and realizes the function of checking of great current,
And the present invention shunts the method for replacing traditional coil type measurement high current using magnetic circuit, reduces the energy consumption of coil drive, effectively
Ground solves the problems, such as the big power consumption of existing large current sensor.
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.Because of magnetic, 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, because what magnetic was intended to fall within the meaning and scope of the equivalent elements of the claims owns
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
Claims (5)
1. a kind of wide range current sensor based on shunt magnetic structure, it is characterised in that: including printed circuit board (1), magnet ring
(2), flow dividing structure (3), four operational amplifiers (4), multichannel ADC, MCU and display screen；
It is provided with magnetic core mounting groove (101) on the printed circuit board (1), the fixed level of the magnet ring (2) is embedded in magnetic core peace
It in tankage (101), is offered magnet ring gap (201) on the magnet ring (2), the flow dividing structure (3) is arranged in magnet ring gap
(201) in；
The flow dividing structure (3) includes two fixed frames (301) made of non-magnetic material, magnetic flux guiding device (302) and four
A identical magnetic sensor chip (303)；
The fixed frame (301) is connected on magnet ring (2) opening inner wall, and the magnetic flux guiding device (302) is strip four prism type,
And it is arranged between two fixed frames (301), magnetic flux guiding device (302) and the fixed frame (301) composition I-shaped structure, four
A magnetic sensor chip (303) is divided into two groups of left and right sides for being symmetricly set on magnetic flux guiding device (302), between magnet ring
Two magnetic of two magnetic sensor chips (303) of gap (201) upper surface location and close magnet ring gap (201) lower surface position
Sensor chip (303) is symmetrical above and below about magnetic flux guiding device (302) horizontal median axis；
Four magnetic sensor chip (303) output ends are both connected on the input terminal of the operational amplifier (4), four institutes
It states operational amplifier (4) and is commonly connected to multichannel ADC input terminal, described in the digital signal warp that multichannel ADC output end exports
MCU carries out digital processing, and treated, and signal leads to display screen display output.
2. a kind of wide range current sensor based on shunt magnetic structure according to claim 1, it is characterised in that: described
Fixed frame (301) is made of heat resistant plastice or aluminium.
3. a kind of wide range current sensor based on shunt magnetic structure according to claim 1, it is characterised in that: described
Magnetic sensor chip (303) uses spin valve giant magnetoresistance sensing chip, magnetic tunnel-junction sensing chip, anisotropic magnetic sensing chip
Or fluxgate sensing chip.
4. a kind of wide range current sensor based on shunt magnetic structure according to claim 1, it is characterised in that: described
Magnetic flux guiding device (302) is made of silicon steel or amorphous & nanocrystalline.
5. a kind of wide range current sensor based on shunt magnetic structure according to claim 1, it is characterised in that: described
Magnet ring (2) uses circular magnetic loop or square magnetic ring, and magnet ring is made of silicon steel, amorphous nano-crystalline or permalloy material.
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| CN201910448601.1A CN110146737A (en) | 2019-05-28 | 2019-05-28 | A kind of wide range current sensor based on shunt magnetic structure |
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| CN201910448601.1A CN110146737A (en) | 2019-05-28 | 2019-05-28 | A kind of wide range current sensor based on shunt magnetic structure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111740465A (en) * | 2020-07-06 | 2020-10-02 | 歌尔科技有限公司 | Battery charge-discharge detection device and intelligent wearable equipment |
| 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 |
| CN113933573A (en) * | 2021-09-28 | 2022-01-14 | 杭州电子科技大学 | Wide-range high-precision closed-loop current sensor |
| CN116539942A (en) * | 2023-07-06 | 2023-08-04 | 深圳市知用电子有限公司 | Magnetic flux detection system and current sensor |
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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 |
| CN113933573A (en) * | 2021-09-28 | 2022-01-14 | 杭州电子科技大学 | Wide-range high-precision closed-loop current sensor |
| CN116539942A (en) * | 2023-07-06 | 2023-08-04 | 深圳市知用电子有限公司 | Magnetic flux detection system and current sensor |
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Application publication date: 20190820 |