CN112730947B - Anti-saturation large-current double-Hall-element current sensor - Google Patents
Anti-saturation large-current double-Hall-element current sensor Download PDFInfo
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- CN112730947B CN112730947B CN202011469500.1A CN202011469500A CN112730947B CN 112730947 B CN112730947 B CN 112730947B CN 202011469500 A CN202011469500 A CN 202011469500A CN 112730947 B CN112730947 B CN 112730947B
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- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
Abstract
The invention discloses an anti-saturation heavy-current double-Hall-element current sensor which is suitable for detecting the current of a contactor in a wider range and is suitable for occasions with small requirements on volume. The magnetic circuit part utilizes double Hall elements with the positions of 180 degrees to induce the magnetic induction intensity of detection signals with the same size and direction locally and the magnetic induction intensity of interference signals with the same size and opposite direction locally, so that the interference of an external magnetic field is eliminated in a superposition manner, and the purpose of detecting current is achieved through the linear relation of the magnetic induction intensity of the Hall elements to voltage; the magnetic circuit part is made into a magnetic shielding shell by using a cobalt alloy which is an anti-saturation magnetic material and is used for shielding the magnetic field interference of the permanent magnet of the contactor and the adjacent binding post of the contactor. The magnetic circuit structurally comprises a Hall conditioning circuit, a magnetic ring air gap framework and a magnetic shielding shell. The invention adopts high permeability magnetic material as magnetic ring material, and the magnetic circuit is composed of magnetic ring, high performance nylon and 8 2mm air gaps, thereby achieving the purpose of improving the current detection range.
Description
Technical Field
The invention relates to an electromagnetic interference prevention Hall sensor, in particular to an anti-saturation large-current double-Hall-element current sensor.
Technical Field
The current detection device taking the Hall element as the leading factor is a current detection element which is developed by applying the Hall effect principle and is used for carrying out isolation detection on primary side current, the magnetic ring concentrates magnetic flux lines generated by conductor current at the center of an air gap, and the Hall element positioned at the center collects the magnetic field to generate Hall voltage which is in equal proportion to the primary side magnetic field. By measuring the magnitude of the Hall voltage, the isolation detection of the primary side current can be realized. The Hall current sensor has the characteristics of good linearity, strong anti-interference capability, high response speed, simple installation and the like, and can be divided into an open-loop Hall sensor and a closed-loop Hall sensor according to the working principle. The closed-loop Hall sensor has the characteristics of large bandwidth, high response speed and the like relatively, but the closed-loop Hall sensor is too large in size and is not suitable for being integrated into a small-sized switching device.
The open-loop Hall sensor has the characteristics of simple process, low cost and small volume, but Hall sensor products applied to contactors on the market cannot adapt to the shape and size of terminals of a switch device, certain residual magnetism exists after reciprocating operation to cause zero drift, the reachable measurement range is about 1000A, and the problem of overlarge volume is also existed compared with parameters of a switch electric appliance applied to the open-loop Hall sensor.
Therefore, a small-sized hall current sensor with a larger measuring range and capable of effectively resisting residual magnetism is a problem to be solved urgently under the condition of keeping the anti-interference capability, the response speed and the linearity.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the anti-saturation large-current double-Hall-element current sensor which can measure the maximum transient 3000A current, has small volume, can be applied to the protection of a contactor and a circuit breaker when fault large current is generated, and has the characteristics of small volume, wide measuring range, small zero drift, strong double-Hall anti-interference capability, good dynamic response, stable output and convenient installation.
A current sensor with double Hall elements and anti-saturation heavy current has an annular structure as a whole; the method is characterized in that: comprises a magnetic shielding cover plate, a circuit board, a Hall element, a magnetic ring air gap framework and a magnetic shielding base.
A magnetic ring air gap framework and a circuit board are coaxially arranged in the magnetic shielding base from bottom to top, and a magnetic shielding cover plate is arranged at the top of the magnetic shielding base.
The circumference of the magnetic ring air gap framework is provided with 6 sectors concentric with the magnetic ring air gap framework; the tangential intervals of the 6 magnetic ring mounting grooves are equal; 2 large arc long magnetic ring installation grooves and 4 small arc long magnetic ring installation grooves are formed in the 6 magnetic ring installation grooves; the magnetic ring components with the same size as the small arc long magnetic ring mounting grooves are mounted in the two small arc long magnetic ring mounting grooves; two magnetic ring assemblies with the same size as the small arc long magnetic ring mounting grooves are respectively mounted in the two large arc long magnetic ring mounting grooves; a gap is formed between the two magnetic ring assemblies in each large-arc long magnetic ring installation groove, and the gap positions between the magnetic ring assemblies in the two large-arc long magnetic ring installation grooves are opposite; therefore, air gaps exist between adjacent magnetic ring assemblies, the contact surfaces of the magnetic ring assemblies and the air gaps are equal magnetic sections, and the equal magnetic sections of the adjacent magnetic ring piece assemblies are parallel.
The circuit board is used for detecting current and is integrated with two Hall elements; the two Hall elements are respectively arranged in the gap between the magnetic ring assemblies in the two large-arc-length magnetic ring mounting grooves, and the centers of the two Hall elements are superposed with the centers of the magnetic sections of the magnetic ring assemblies on the two sides of the two Hall elements, which are opposite to each other.
When the contactor/breaker generates a large current far higher than a rated value due to a fault and the like, the current passes through the detection copper column to form a detection signal magnetic field, and meanwhile, the current passes through the adjacent copper column to form a magnetic field of an interference signal. The magnetic induction intensity with the same direction in the size direction is induced by the detection signal magnetic field at the positions of the double Hall elements which are 180 degrees mutually, and the magnetic leakage is reduced by the magnetic shielding device. Meanwhile, the interference signal and an interference magnetic field generated by the permanent magnet of the contactor/breaker are firstly weakened by shielding of the magnetic shielding device for the first time, and then the interference magnetic field is weakened for the second time by inducing the magnetic induction intensities with the same size and opposite directions through the positions of the double Hall elements which are 180 degrees from each other.
The double Hall elements are installed at the positions of 0 degree and 180 degrees, when transient large current passes through the contactor, the magnetic induction intensity of detection signals induced by the two Hall elements at 0 degree and 180 degrees is equal in size in the local direction, the magnetic induction intensity of interference signals is equal in size and opposite in direction, external magnetic field interference is eliminated through signal superposition, the current size is reversely deduced according to the linear relation between the magnetic induction intensity of the Hall elements and voltage and a measured voltage value, and the measurement of the size of the transient large current is realized.
The invention has the advantages that:
1. the anti-saturation large-current double-Hall-element current sensor adopts 8 magnetic rings made of high-permeability magnetic materials and 8 air gaps to be combined, so that the measuring range of the sensor is improved.
2. According to the anti-saturation large-current double-Hall-element current sensor, the Hall elements are positioned in two air gaps which form an angle of 180 degrees with each other, and the proportion of air magnetic resistance in a magnetic circuit is improved through the distributed air gaps, so that the purpose of improving the range of a detected contactor is achieved.
3. The anti-saturation large-current double-Hall-element current sensor occupies no more than 15mm of space volume, and no more than 30 square centimeters (the total volume is no more than 45 cubic centimeters) in a horizontal plane. From outside to inside, the anti-saturation shell of the product is made of cobalt alloy, the anti-magnetic saturation property ensures that the anti-magnetic saturation shell can greatly shield adjacent wire columns when in use and peripheral electrified wires generate magnetic field interference, and double Hall elements forming 180 degrees mutually can induce the magnetic induction intensity of detection current with the same local size and direction and the magnetic induction intensity of interference signals with the same size and opposite direction, so that the problem of electromagnetic interference is solved essentially.
Drawings
Fig. 1 is a schematic view of the whole structure of the anti-saturation large-current double-hall element current sensor.
Fig. 2 is an exploded structural schematic diagram of the anti-saturation large-current double-hall element current sensor of the invention.
FIG. 3 is a schematic diagram of an adhesion structure in a magnetic ring sheet of the anti-saturation large-current double-Hall-element current sensor of the invention.
Fig. 4 is a flow chart of the measurement principle of the anti-saturation large-current double-hall-element current sensor of the invention.
Fig. 5 is a flow chart of the installation of the anti-saturation large-current double-hall-element current sensor of the invention.
In the figure:
1-magnetic shielding cover plate 2-circuit board 3-Hall element
4-magnetic ring 5-magnetic ring air gap framework 6-magnetic shielding base
101-baffle 201-positioning protrusion 401-magnetic ring sheet assembly
401 a-magnetic ring plate 501-upper ring base 502-lower ring base
503-magnetic ring mounting groove 601 locating slot
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention relates to an anti-saturation large-current double-Hall element current sensor, which comprises a magnetic shielding cover plate 1, a circuit board 2, Hall elements 3, a magnetic ring 4, a magnetic ring air gap framework 5 and a magnetic shielding base 6, as shown in figures 1 and 2. The whole is of an annular structure, so that the magnetic shielding cover plate 1, the circuit board 2, the magnetic ring air gap framework 5 and the magnetic shielding base 6 are all designed to be of an annular structure.
The magnetic shielding base 6 is of a cylindrical structure, and the thickness of the circumferential side wall and the bottom surface is 1 mm. A through hole is formed in the center of the bottom surface of the magnetic shielding base 6, and a square positioning groove 601 with the height and the width of 0.5mm penetrating through the top surface of the side wall is designed on one side of the side wall. A magnetic ring air gap framework 5 and a circuit board 2 are coaxially arranged in a magnetic shielding base 6 from bottom to top, and a magnetic shielding cover plate 1 is arranged at the top.
The inner diameter of the magnetic ring air gap framework 5 is 16.5mm, the outer diameter is 28.5mm, the thickness is 3.8mm, the material is high-performance nylon, and the inner diameter of the magnetic ring air gap framework is equal to the diameter of a contactor or a circuit breaker copper column. The inner circumferences of the top surface and the bottom surface of the magnetic ring air gap framework 5 are respectively provided with a raised upper annular base 501 and a raised lower annular base 502. The lower annular base is used for realizing the installation and positioning of the magnetic ring air gap framework 5 in the magnetic shielding base 6; the outer diameter of the lower annular base 502 is equal to the central through hole of the bottom surface of the magnetic shielding base 6, the lower annular base 502 is inserted into the central through hole of the bottom surface of the magnetic shielding base 6, so that the bottom surface of the magnetic ring air gap framework 5 is attached to the bottom surface of the magnetic shielding base 6, the circumferential outer wall is attached to the circumferential side wall of the magnetic shielding base 6, and the end surface of the lower annular base 502 and the bottom surface of the magnetic shielding base 6 are located on the same horizontal plane. The annular base 501 on the magnetic ring air gap frame is used to support the circuit board 2.
The magnetic ring air gap framework 5 is circumferentially provided with 6 fan-shaped magnetic ring installation grooves 503 which are concentric with the magnetic ring air gap framework 5, the depth is 3mm, the outer diameter is 26.5mm, the inner diameter is 18.5mm, and the depth is 3 mm. I.e. the thickness of the separator is 2 mm. Two large arc length magnetic ring mounting grooves and four small arc length magnetic ring mounting grooves are arranged in the 6 magnetic ring mounting grooves 503. The two large arc long magnetic ring mounting grooves are opposite in position, and two small arc long magnetic ring mounting grooves are arranged between two sides of the two large arc long magnetic ring mounting grooves; and the inner arc central angle and the outer arc central angle of the two large arc long magnetic ring mounting grooves are respectively larger than the sum of the inner arc central angles and the sum of the outer arc central angles of the two small arc long magnetic ring mounting grooves. In the embodiment, the central angle of the outer arc of the two large-arc long magnetic ring installation grooves is designed to be 81.37 degrees, and the central angle of the inner arc is designed to be 77.66 degrees; the central angles of the outer arcs of the four small-arc-length magnetic ring installation grooves are designed to be 36.37 degrees, the central angles of the inner arcs are designed to be 32.66 degrees, and a partition plate with the width of 2mm is arranged between two adjacent magnetic ring installation grooves 503, namely the tangential distance between the two adjacent magnetic ring installation grooves 503 is 2 mm.
The magnetic ring 4 is of a 401 annular structure formed by 8 identical magnetic ring sheet assemblies with uniform magnetic sections. Each magnetic ring sheet assembly 401 is formed by vertically laminating, bonding and fixing 6 fan-shaped magnetic ring sheets 401a with equal size, and each magnetic ring sheet is a thin sheet with the thickness of 0.5 mm. The whole size is the same as the size of the small arc length magnetic ring installation groove in the magnetic ring air gap framework 5. Among the 8 magnetic ring piece assemblies 401 of above-mentioned structure, 4 magnetic ring piece assemblies 401 are installed respectively in 4 little arc length magnetic ring mounting grooves, and the tight fit is fixed, makes the laminating of magnetic ring piece assembly 401 circumference lateral wall and little arc length magnetic ring mounting groove circumference inner wall, and the top flushes with magnetic ring mounting groove top surface. And the other 4 magnetic ring sheet assemblies are grouped pairwise and are respectively arranged in the two large-arc-length magnetic ring mounting grooves and are fixed in a tight fit manner, so that the other side walls of the same group of magnetic ring sheet assemblies 401 in the circumferential direction except the opposite side walls are attached to the inner walls of the large-arc-length magnetic ring mounting grooves, and due to the size design of the large-arc-length magnetic ring mounting grooves, 2mm wide gaps are formed between the opposite side walls after the same group of magnetic ring sheet assemblies 401 are mounted to serve as Hall sensor insertion positions. From this 8 magnetic ring piece subassemblies enclose into the annular, and the external diameter is 26.5mm, internal diameter 18.5mm, thickness 3mm, and there are 8 air gaps of 2mm in the circumference, and wherein the contact surface of magnetic ring piece subassembly 401 and air gap is the magnetic cross section of equalling, and the magnetic cross section of equalling of adjacent magnetic ring piece subassembly is parallel, guarantees that the magnetic induction intensity in the air gap distributes evenly and the size is even. Meanwhile, the 6 magnetic ring sheets are stacked and bonded to form the magnetic ring 4, so that the influence of eddy current under large current is reduced under the condition of not influencing dynamic response. The magnetic ring piece 401a is made of high-permeability magnetic materials (1J79 or 1J50), remanence interference can be effectively resisted, the accuracy under low current can be guaranteed by taking the low-coercivity magnetic material 1J79 as an example, and the problem of zero drift is solved.
The circuit board 2 is used for detecting current, the outer diameter is 28.5mm, the inner diameter is 18.6mm, the inner diameter is slightly larger than the inner diameter of the magnetic ring air gap framework, two Hall elements 3 and various integrated elements are integrated on the circuit board, and the two Hall elements 3 are respectively located at the circumferential opposite positions of the circuit board 2 and used for detecting current. Meanwhile, a positioning protrusion 201 is designed on one side of the circuit board 2 for mounting and positioning the circuit board 2, and 4 wiring terminals are connected from the positioning protrusion 201 and respectively used for two power supply inputs and two voltage outputs.
The circuit board 2 is coaxially arranged in the magnetic shielding base 6, so that the two Hall elements 3 are respectively arranged in the Hall sensor inserting positions in the two large arc long magnetic ring mounting grooves. The bottom surface of the circuit board 2 is attached to an annular base 501 at the upper part of the magnetic ring air gap framework 5; meanwhile, the positioning protrusion 201 on one side of the circuit board 2 is inserted into the positioning groove 601 on the side wall of the magnetic shielding base, so that the circumferential positioning of the circuit board 2 is realized, two Hall elements 3 on the circuit board 2 are not in contact with the magnetic ring sheet assemblies 401 on two sides of the respective positions, the centers of the two Hall elements 3 are overlapped with the centers of the magnetic ring sheet assemblies 401 on two sides of the respective positions, and the positions of the Hall elements 3 can be completely fixed through glue filling in the later period.
The magnetic shielding cover plate 1 is 30.5mm in outer diameter, 18.5mm in inner diameter and 1mm in thickness, is embedded in an annular shoulder 602 which is circumferentially designed in the top surface of the magnetic shielding base 6, and is fixed in a close fit manner. The baffle 101 is arranged on one side of the magnetic shielding cover plate 1, when the magnetic shielding cover plate 1 is installed, the baffle 101 is embedded in the positioning groove 601 on the side wall of the magnetic shielding base 6, the positioning bulge 201 of the circuit board 2 is pressed, and the axial fixation of the circuit board is realized.
According to the invention, the magnetic shielding cover plate 1 and the magnetic shielding base 6 both use anti-saturation magnetic material cobalt alloy, so that the problem that the magnetic shielding shell loses the function of shielding an external magnetic field due to magnetic saturation under a large current is greatly reduced.
When the contactor/breaker generates a large current far higher than a rated value due to a fault and the like, the current passes through the detection copper column to form a detection signal magnetic field, and meanwhile, the current passes through the adjacent copper column to form a magnetic field of an interference signal. The magnetic induction intensity with the same direction in the size direction is induced by the detection signal magnetic field at the positions of the double Hall elements which are 180 degrees mutually, and the magnetic leakage is reduced by the magnetic shielding device. Meanwhile, the interference signal and an interference magnetic field generated by the permanent magnet of the contactor/breaker are firstly weakened by shielding of the magnetic shielding device for the first time, and then the interference magnetic field is weakened for the second time by inducing the magnetic induction intensities with the same size and opposite directions through the positions of the double Hall elements which are 180 degrees from each other.
The double Hall elements are installed at the positions of 0 degree and 180 degrees, when transient large current passes through the contactor, the magnetic induction intensity of detection signals induced by the two Hall elements at 0 degree and 180 degrees is equal in size in the local direction, the magnetic induction intensity of interference signals is equal in size and opposite in direction, external magnetic field interference is eliminated through signal superposition, the current size is reversely deduced according to the linear relation between the magnetic induction intensity of the Hall elements and voltage and a measured voltage value, and the measurement of the size of the transient large current is realized.
The anti-saturation heavy current double-Hall element current sensor is manufactured and assembled in the following mode:
a. and cutting out all the magnet ring sheets by using wire cutting. During cutting, the whole circular piece is used as a base for cutting, and the radius of the circular piece is equal to the long radius of the outer arc of the magnetic ring mounting groove 503. Firstly, cutting the circular sheet at the positions of 1mm on two sides of the diameter A of the circular sheet in parallel to the diameter A, and dividing the circular sheet into two parts; then, cutting the two sides of another diameter B perpendicular to the diameter A at the position of 1mm in parallel to the diameter B, and dividing the right circular sheet into four parts; further, 1mm positions on two sides of two diameters C which form an angle of 45 degrees with the diameter A are cut in parallel with the diameter C to obtain 8 fan-shaped magnetic ring pieces; and finally, cutting out inner arcs at included angles of the 8 fan-shaped magnetic ring pieces to obtain 8 fan-shaped magnetic ring pieces. The star-shaped cutting method is repeated for 6 times, and finally the magnetic ring piece 401a with the shape of the whole sector is obtained.
b. And (b) soaking all the sector-shaped magnetic ring pieces 401a obtained in the step (a) in kerosene to clean dirt.
c. Every six magnetic ring pieces 401a are adhered by glue from top to bottom to form 8 magnetic ring assemblies 401.
d. And forming the magnetic ring air gap framework 5 by 3D printing or pressing with a mould.
e. The 8 magnetic ring assemblies 401 are sequentially pressed into the grooves on the magnetic ring air gap framework 5, and the magnetic ring assemblies cannot be knocked by external force during installation.
f. The magnetic shielding base 6 is turned by a lathe.
g. The 8 magnetic ring assemblies 401 and the magnetic ring air gap framework 5 are integrally pressed into the magnetic shielding base 6.
h. And completing the welding manufacture of the circuit board containing the two Hall elements 3.
i. The two hall elements 3 are aligned with the hall sensor insertion position, and the positioning projections 201 of the circuit board 2 are inserted into the side wall positioning grooves 601 of the magnetic shield base 6.
j. The magnetic shielding cover plate 1 is turned by a lathe.
k. And covering the magnetic shielding cover plate 1, and pouring glue into the inner part from the center hole of the integral structure for fixation.
Claims (9)
1. A current sensor with double Hall elements and anti-saturation heavy current has an annular structure as a whole; the method is characterized in that: the magnetic shielding device comprises a magnetic shielding cover plate, a circuit board, a Hall element, a magnetic ring air gap framework and a magnetic shielding base;
a magnetic ring air gap framework and a circuit board are coaxially arranged in the magnetic shielding base from bottom to top, and a magnetic shielding cover plate is arranged at the top of the magnetic shielding base;
the circumference of the magnetic ring air gap framework is provided with 6 sectors concentric with the magnetic ring air gap framework; the tangential intervals of the 6 magnetic ring mounting grooves are equal; 2 large arc long magnetic ring installation grooves and 4 small arc long magnetic ring installation grooves are formed in the 6 magnetic ring installation grooves; the four magnetic ring assemblies are respectively arranged in the four small arc long magnetic ring mounting grooves; two magnetic ring assemblies with the same size as the small arc long magnetic ring mounting grooves are respectively mounted in the two large arc long magnetic ring mounting grooves; a gap is formed between the two magnetic ring assemblies in each large-arc long magnetic ring installation groove, and the gap positions between the magnetic ring assemblies in the two large-arc long magnetic ring installation grooves are opposite; therefore, air gaps exist between adjacent magnetic ring assemblies, the contact surface of each magnetic ring assembly and each air gap is a uniform magnetic section, and the uniform magnetic sections of the adjacent magnetic ring assemblies are parallel;
the circuit board is used for detecting current and is integrated with two Hall elements; the two Hall elements are respectively arranged in the gap between the magnetic ring assemblies in the two large-arc-length magnetic ring mounting grooves, and the centers of the two Hall elements are superposed with the centers of the magnetic cross sections of the magnetic ring assemblies on the two sides of the two Hall elements, which are opposite to each other.
2. The dual hall element current sensor of claim 1 wherein: a positioning groove penetrating through the top surface of the side wall is designed at one side of the side wall of the magnetic shielding base; a positioning bulge is arranged on one side of the circuit board and used for being matched with the positioning groove to realize the mounting and positioning of the circuit board; the baffle has been lapped to magnetic shield one side, through baffle embedded in the constant head tank, compresses tightly the protruding axial fixity who realizes the circuit board of location of circuit board.
3. The dual hall element current sensor of claim 1 wherein: the installation mode of the magnetic ring air gap framework is as follows: the inner circumferences of the top surface and the bottom surface of the magnetic ring air gap framework are respectively provided with a raised upper annular base and a raised lower annular base; the lower annular base is used for realizing the installation and positioning of the magnetic ring air gap framework in the magnetic shielding base; the lower annular base is inserted into a central through hole in the bottom surface of the magnetic shielding base, so that the bottom surface of the magnetic ring air gap framework is attached to the bottom surface of the magnetic shielding base, the circumferential outer wall is attached to the circumferential side wall of the magnetic shielding base, and the end surface of the lower annular base and the bottom surface of the magnetic shielding base are positioned on the same horizontal plane.
4. The dual hall element current sensor of claim 1 wherein: the magnetic ring component is formed by vertically laminating, bonding and fixing 6 sector-shaped magnetic ring pieces with the same size as the small-arc long magnetic ring installation grooves.
5. The dual hall element current sensor of claim 1 wherein: the concrete sizes of each part are as follows:
the thickness of the circumferential side wall and the bottom surface of the magnetic shielding base is 1 mm;
the inner diameter of the air gap framework of the magnetic ring is 16.5mm, the outer diameter is 28.5mm, and the thickness is 3.8 mm;
the depth of the magnetic ring installation groove is 3mm, the outer diameter is 26.5mm, the inner diameter is 18.5mm, and the depth is 3 mm;
the central angle of the outer arc of the two large-arc long magnetic ring mounting grooves is designed to be 81.37 degrees, and the central angle of the inner arc is designed to be 77.66 degrees; the central angles of outer arcs of the four small-arc long magnetic ring installation grooves are designed to be 36.37 degrees, the central angles of inner arcs are designed to be 32.66 degrees, the magnetic ring components are enclosed into a ring shape, the outer diameter is 26.5mm, the inner diameter is 18.5mm, and the thickness is 3 mm; the tangential distance between the 6 magnetic ring mounting grooves is 2 mm; the gap between the two magnetic ring assemblies in each large-arc long magnetic ring mounting groove is 2 mm;
the outer diameter of the circuit board is 28.5mm, and the inner diameter is 16.5 mm;
the outer diameter of the magnetic shielding cover plate is 30.5mm, the inner diameter is 18.5mm, and the thickness is 1 mm.
6. The dual hall element current sensor of claim 1 wherein: the magnetic ring air gap framework is made of high-performance nylon; the magnetic ring component is made of high-permeability magnetic materials.
7. The dual hall element current sensor of claim 1 wherein: the magnetic shielding cover plate and the magnetic shielding base both use anti-saturation magnetic material cobalt alloy.
8. The dual hall element current sensor of claim 1 wherein: the assembly method is as follows:
a. cutting all the magnetic ring sheets by linear cutting;
b. soaking all the magnetic ring sheets in kerosene to clean dirt;
c. bonding every six magnetic ring pieces from top to bottom by glue to form 8 magnetic ring assemblies;
d. forming a magnetic ring air gap framework through 3D printing or pressing by using a mold;
e. sequentially pressing 8 magnetic ring components into a groove on a magnetic ring air gap framework;
f. a lathe is used for turning out the magnetic shielding base;
g. integrally pressing 8 magnetic ring assemblies and a magnetic ring air gap framework into a magnetic shielding base;
h. completing welding manufacture of a circuit board containing two Hall elements;
i. inserting two Hall elements into a gap between the magnetic ring assemblies in the two large-arc-length magnetic ring installation grooves;
j. turning a magnetic shielding cover plate by using a lathe;
k. and covering the magnetic shielding cover plate, and filling glue into the inner part from the center hole of the integral structure for fixation.
9. The dual hall element current sensor of claim 8 wherein: the specific cutting mode in the step b is as follows: cutting is carried out on the basis of a whole circular piece, wherein the radius of the circular piece is equal to the outer arc long radius of the small arc long magnetic ring mounting groove; firstly, cutting a circular sheet in a position which is 1mm away from the two sides of a diameter A of the circular sheet and is parallel to the diameter A, and dividing the circular sheet into two parts; then, cutting the circular sheet into four parts in parallel with the diameter B at the positions which are 1mm at two sides of the other diameter B vertical to the diameter A; further, 1mm positions on two sides of two diameters C which form an angle of 45 degrees with the diameter A are cut in parallel with the diameter C to obtain 8 fan-shaped magnetic ring pieces; and finally, cutting out inner arcs at included angles of the 8 fan-shaped magnetic ring pieces to obtain 8 fan-shaped magnetic ring pieces.
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| CN117594340B (en) * | 2024-01-15 | 2024-04-16 | 江苏常荣电器股份有限公司 | Closed loop hall current sensor coil design structure |
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| CN102818924A (en) * | 2012-09-07 | 2012-12-12 | 天津市松正电动汽车技术股份有限公司 | Controller current sensor |
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| JP2004325352A (en) * | 2003-04-25 | 2004-11-18 | Asahi Kasei Electronics Co Ltd | Current sensor |
| US20130009655A1 (en) * | 2011-03-01 | 2013-01-10 | Sendyne Corporation | Current sensor |
| EP3026445B1 (en) * | 2014-11-28 | 2017-08-23 | LEM Intellectual Property SA | Electrical current transducer with electrostatic shield |
| CN204302357U (en) * | 2014-12-25 | 2015-04-29 | 南京中旭电子科技有限公司 | A kind of Hall current sensor |
| CN205103295U (en) * | 2015-09-23 | 2016-03-23 | 厦门红相电力设备股份有限公司 | Two hall element circuit among current detection are revealed to special high voltage direct current arrester |
| CN205374568U (en) * | 2015-12-31 | 2016-07-06 | 深圳青铜剑科技股份有限公司 | Closed -loop hall current sensor |
| CN110095643A (en) * | 2019-04-10 | 2019-08-06 | 三峡大学 | A kind of four air gap open loop Hall current sensor of single magnetic core |
| CN110095644A (en) * | 2019-04-10 | 2019-08-06 | 三峡大学 | A kind of novel high-precision open loop Hall current sensor |
| CN110108920B (en) * | 2019-04-23 | 2020-07-03 | 北京航空航天大学 | Embeddable open-loop Hall current sensor for intelligent contactor |
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