A Hall current sensor with strong anti-interference and its preparation method

Abstract

The present invention discloses a Hall current sensor with strong anti-interference performance and a preparation method thereof. The Hall current sensor includes a circuit board installed in a protective shell, a Hall element installed on the circuit board, multiple pins of the Hall element are covered with a pin shielding layer, and the outer surface of the protective shell is covered with a shell shielding layer on one side. The preparation method includes a lamination operation of the Hall element and an assembly operation of the Hall current sensor. The lamination operation is to perform hot-press lamination of the shielding film on the Hall pins through a shielding layer attachment system. The assembly operation is to install the Hall element on the circuit board, and then the circuit board is installed in the protective shell. The present invention improves the anti-interference performance of the Hall current sensor and improves the detection accuracy of the Hall current sensor. The present invention is applicable to the technical field of the production and processing of Hall current sensors.

Description

Technical Field

[0001] The present invention belongs to the technical field of production and processing of Hall current sensors, and in particular relates to a Hall current sensor with strong anti-interference properties and a preparation method thereof. Background Art

[0002] Hall effect current sensors are designed based on the Hall effect principle. They indirectly measure the current in a current-carrying conductor by measuring the Hall potential. They offer advantages such as high precision, compact size, wide bandwidth, and strong overload capacity, making them widely used in detection applications. Currently, Hall effect current sensors are subject to extremely high precision requirements, especially in measurement equipment requiring high precision. However, due to the influence of external electromagnetic waves, the detection results of Hall effect current sensors may deviate, ultimately affecting measurement accuracy. Therefore, there is an urgent need for a Hall effect current sensor that can effectively resist interference from external electromagnetic waves to improve its detection accuracy. Summary of the Invention

[0003] The present invention provides a Hall current sensor with strong anti-interference performance and a preparation method thereof, so as to improve the anti-interference performance of the Hall current sensor and the detection accuracy of the Hall current sensor.

[0004] To achieve the above object, the technical solutions adopted by the present invention are as follows:

[0005] A Hall current sensor with strong anti-interference performance includes a circuit board installed in a protective shell, a Hall element installed on the circuit board, multiple pins of the Hall element are covered with a pin shielding layer, and the outer surface of the protective shell is covered with a shell shielding layer on one side.

[0006] The present invention also discloses a method for preparing the above-mentioned Hall current sensor with strong anti-interference properties, comprising the following steps:

[0007] Hall element coating

[0008] Step 1. Continuously supply the Hall element strips to the shield layer attachment system;

[0009] Step 2. Control the film releasing device of the shielding layer attaching system to continuously release the two shielding films to the upper and lower ends of the Hall element strip;

[0010] Step 3. Control the hot pressing device to hot press the two shielding films onto the upper and lower ends of the pin strip of the Hall element strip;

[0011] Step 4. Control the film cutting device to cut the shielding film between two adjacent pins at the pin strip;

[0012] Step 5. Control the winding device to wind up the coated and cut Hall element strip;

[0013] Assembly of Hall current sensor

[0014] S1. Remove the Hall elements from the laminated Hall element strip one by one;

[0015] S2. Mount the Hall element on a circuit board and ensure that the pin end of the Hall element is electrically connected to the circuit board. The circuit board is constructed with a magnetic core, an excitation circuit, and a signal processing circuit to form a Hall current sensor with the Hall element;

[0016] S3. Install the assembled circuit board in the protective case.

[0017] Furthermore, the film unwinding device includes two film unwinding shafts arranged opposite to each other up and down, and the two ends of the film unwinding shafts are respectively rotatably connected to adapter plates, and a first transmission wheel is coaxially assembled at one axial end of the film unwinding shaft, and the shielding film is wound on the film unwinding shaft; a guide preheating film device is provided between the film unwinding device and the hot pressing film device, and the shielding film is unwound by the film unwinding device and enters the hot pressing film device after being guided by the guide preheating film device.

[0018] Furthermore, the guide preheating film device includes two guide preheating roller groups arranged opposite to each other in the upper and lower directions, and each guide preheating roller group includes a plurality of adjustable guide rollers arranged in sequence along the conveying direction of the Hall element belt and inclined toward the Hall element belt. One adjustable guide roller is selected to be connected to the transverse beam, and the two adjacent adjustable guide rollers are connected via a connecting plate.

[0019] Furthermore, the adjustable guide roller includes a roller-shaped body whose axial ends are rotatably connected to vertical tubes through first shaft rods, a first electric heating wire is installed in the roller-shaped body, a vertical rod is movably inserted at the upper end of each vertical tube, the upper end of each vertical rod passes through the transverse plate, a locking nut is threadedly connected to the vertical rod, a telescopic spring is sleeved on the outer side of the vertical rod, and the two ends of the telescopic spring are respectively connected to the transverse plate and the vertical tube; a connecting seat is provided above the transverse plate, a first vertical adjusting screw is threadedly connected to the connecting seat, and the lower end of the first vertical adjusting screw is rotatably connected to the transverse plate, a first operating handwheel is installed at the upper end of the first vertical adjusting screw, and at least one vertical guide rod is constructed on the transverse plate, and the upper end of the vertical guide rod movably passes through the connecting seat.

[0020] Furthermore, the hot pressing film device includes two vertical guide rail groups symmetrically installed on both sides of the assembly frame, and hot pressing film roller groups are symmetrically arranged between the two vertical guide rail groups and at the upper and lower ends of the Hall element belt. Each of the hot pressing film roller groups is transmission-connected to the two vertical guide rail groups.

[0021] Furthermore, each of the vertical guide rail groups includes two vertical guide rails spaced apart along the conveying direction of the Hall element belt, and each of the hot pressing film roller groups includes two hot pressing rollers spaced apart along the conveying direction of the Hall element belt, and each of the axial ends of the hot pressing roller is rotatably connected to a sliding block through a second shaft, and each of the sliding blocks is slidably connected to the corresponding vertical guide rail, and a second vertical adjustment screw is rotatably connected to each sliding block, and the second vertical adjustment screw is threadedly connected to the assembly frame, and a second operating hand wheel is installed at the end of the second vertical adjustment screw away from the sliding block, and an axial end of a hot pressing roller is selected. A driving motor is installed, and a second transmission wheel is respectively installed on the same side end of the two hot pressing rollers, and the two second transmission wheels are connected by a transmission belt; and the rotation directions of the two hot pressing rollers arranged opposite to each other in the two hot pressing film roller groups are opposite; rolling wheels are respectively coaxially installed on the two second shafts of the hot pressing roller, and there are two Hall element belts, which are arranged opposite to each other, and the two pin parts of the two Hall element belts are close to each other, and the two semiconductor parts are far away from each other, the hot pressing roller rolls on the corresponding end faces of the two pin parts, and the two rolling wheels roll on the corresponding end faces of the two semiconductor parts respectively.

[0022] Furthermore, the hot pressing roller includes a pressing roller body with a built-in second electric heating wire, and a plurality of first assembly grooves are evenly opened on the circumferential surface of the pressing roller body along its circumference, and each of the first assembly grooves extends out from the two ends of the pressing roller body along the axial direction of the pressing roller body, and a first operating port is respectively opened at the two axial ends of the pressing roller body, and a plurality of first connecting holes are respectively opened on the pressing roller body and located at each first operating port, and each of the first connecting holes is connected to the corresponding first assembly groove; a hot pressing strip or a sealing strip is installed in each first assembly groove, and the hot pressing strip is hot-pressed on the area between adjacent pins, and the outer end face of the sealing strip is hot-pressed on the end face of the pin.

[0023] Furthermore, the film cutting device includes two film cutting rollers symmetrically arranged at the upper and lower ends of the Hall element strip, and the axial ends of each film cutting roller are rotatably connected to the two transfer arms through a third shaft, and one third shaft is selected to be connected to the power motor. The two transfer arms located on the same side of the two film cutting rollers are connected through a vertical adjustment rod, and a first threaded portion and a second threaded portion with opposite rotation directions are constructed on the vertical adjustment rod along the vertical interval. The first threaded portion and the second threaded portion are threadedly connected to the two transfer arms respectively, and the lower end of the vertical adjustment rod is rotatably connected to the assembly plate, and the upper end of the vertical adjustment rod is installed with a third operating handwheel.

[0024] Furthermore, the film cutting roller includes an annular cutting knife coaxially constructed in the middle of the knife roller body, and a plurality of second assembly grooves uniformly arranged along the circumference of the knife roller body are respectively provided on the outer peripheral wall of the knife roller body and on both sides of the annular cutting knife, and second operating ports are respectively provided at the axial ends of the knife roller body, and a plurality of second connecting holes are provided on the knife roller body and at each second operating port, each of the second connecting holes is connected to the corresponding second assembly groove, and a cutting knife strip is installed in each second assembly groove, and the cutting knife strip cuts the area between adjacent pins, and the annular cutting knife cuts the area between two pin portions in two Hall element bands.

[0025] Due to the aforementioned structure, the present invention achieves a technological advancement over the prior art in that, since the pins of existing Hall effect current sensors are partially exposed after connection, some electromagnetic interference is generated by this portion. The present invention covers the pins of the Hall element in the Hall effect current sensor with a pin shielding layer to shield electromagnetic interference and ensure that the exposed pin shielding layer is not damaged after the pins of the Hall effect current sensor are electrically connected to the circuit board. The present invention also covers the protective shell containing the Hall effect current sensor with a shell shielding layer. This shell encloses all parts of the Hall effect current sensor except the pins of the Hall effect current sensor, thereby shielding the Hall effect current sensor from external electromagnetic interference. Furthermore, the pins of the Hall effect current sensor are generally located outside the protective shell, facilitating their removal, assembly, and replacement. The present invention utilizes a shielding layer attachment system to apply shielding film to Hall effect current sensors in batches, improving the efficiency of the pin shielding layer coating. This, combined with the subsequent assembly of the Hall effect current sensor, improves the production and processing efficiency of the Hall effect current sensor. In summary, the present invention enhances the anti-interference performance and detection accuracy of the Hall effect current sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0027] In the attached figure:

[0028] Figure 1 This is a schematic structural diagram of a shielding layer attachment system according to an embodiment of the present invention;

[0029] Figure 2 This is a structural side view of a shielding layer attachment system according to an embodiment of the present invention;

[0030] Figure 3 This is a schematic structural diagram of two Hall element strips coated with a film according to an embodiment of the present invention after being partially cut;

[0031] Figure 4 This is a schematic structural diagram of the corresponding arrangements of the film placing device and the guided preheating film device according to an embodiment of the present invention;

[0032] Figure 5 This is a schematic structural diagram of a guide preheating roller group in a guide preheating film device according to an embodiment of the present invention;

[0033] Figure 6 This is a schematic structural diagram of an adjustable guide roller in a guide preheating roller group according to an embodiment of the present invention;

[0034] Figure 7 This is a schematic structural diagram of a hot pressing film device according to an embodiment of the present invention;

[0035] Figure 8 A schematic structural diagram of a hot pressing film device according to another embodiment of the present invention;

[0036] Figure 9 This is a schematic structural diagram of the connection between the hot pressing roller, the drive motor, the two rolling wheels and the two sliding blocks in the hot pressing film device according to an embodiment of the present invention;

[0037] Figure 10 This is a schematic structural diagram of the connection between the hot pressing roller, the second shaft, the sliding block and the second vertical adjustment screw according to an embodiment of the present invention;

[0038] Figure 11 A side view of the structure of a hot pressing roller in a hot pressing film device according to an embodiment of the present invention;

[0039] Figure 12 This is a schematic diagram of the partial structure of the pressing roller body in the hot pressing roller according to an embodiment of the present invention;

[0040] Figure 13 Schematic diagram of the partial structure of the hot pressing strip in the hot pressing roller according to an embodiment of the present invention;

[0041] Figure 14 Schematic diagram of the partial structure of the sealing strip in the hot pressing roller according to an embodiment of the present invention;

[0042] Figure 15 This is a schematic structural diagram of a film cutting device according to an embodiment of the present invention;

[0043] Figure 16 This is a structural side view of a film cutting device according to an embodiment of the present invention;

[0044] Figure 17 This is a structural diagram of the connection between the film cutting roller and the power motor in the film cutting device according to an embodiment of the present invention;

[0045] Figure 18 This is a side view of the structure of the film cutting roller in the film cutting device according to an embodiment of the present invention;

[0046] Figure 19This is a schematic structural diagram of the blade roller body in the film cutting roller according to an embodiment of the present invention;

[0047] Figure 20 Schematic diagram of the structure of the cutting blade in the film cutting roller according to an embodiment of the present invention;

[0048] Figure 21 Schematic diagram of the structure of a protective shell according to an embodiment of the present invention.

[0049] Labeled parts: 100-Hall element belt, 101-semiconductor part, 102-pin part, 103-connecting belt, 200-shielding film, 201-pin shielding layer, 202-longitudinal cutting seam, 203-transverse cutting seam, 300-film release device, 301-adapter plate, 302-film release shaft, 303-first transmission wheel, 400-guide preheating film device, 401-transverse beam, 402-connecting plate, 403-connecting seat, 404-transverse plate, 405-roller body, 406 - first shaft, 407 - vertical tube, 408 - adapter sleeve, 409 - vertical rod, 410 - locking nut, 411 - telescopic spring, 412 - first vertical adjustment screw, 413 - first operating handwheel, 414 - vertical guide rod, 500 - hot pressing device, 501 - assembly frame, 502 - vertical guide rail, 503 - hot pressing roller, 5031 - pressing roller body, 5032 - first assembly groove, 5033 - first operating port, 5034 - first connecting hole, 5035 -First assembly strip, 5036-transition part, 5037-heat pressing strip, 5038-second assembly strip, 5039-sealing strip, 504-rolling wheel, 505-second shaft, 506-second transmission wheel, 507-transmission belt, 508-drive motor, 509-sliding block, 510-second vertical adjustment screw, 511-second operating handwheel, 512-conductive slip ring, 600-film cutting device, 601-film cutting roller, 6011-knife roller body, 6012-annular cutting Knife, 6013-second assembly groove, 6014-second operating port, 6015-second connecting hole, 6016-third assembly strip, 6017-cutting knife strip, 602-third shaft, 603-power motor, 604-transfer arm, 605-vertical adjustment rod, 606-assembly plate, 607-first threaded portion, 608-second threaded portion, 609-third operating handwheel, 700-winding device, 800-protective shell, 801-installation cavity, 802-shell shielding layer. DETAILED DESCRIPTION

[0050] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0051] The present invention discloses a Hall current sensor with strong anti-interference, including a circuit board installed in a protective shell 800, on which a Hall element is installed. This structure is an existing connection structure and will not be described in detail here. The main difference is that the multiple pins of the Hall element are covered with a pin shielding layer 201, and the outer surface of the protective shell 800 is covered with a shell shielding layer 802 on one side. The working principle and advantage of the present invention are: since a part of the pins of the existing Hall current sensor will be exposed to the outside after connection, a part of the electromagnetic interference is generated by this part. The present invention covers the pins of the Hall element in the Hall current sensor with a pin shielding layer 201 to shield the interference of electromagnetic waves, and ensures that the pins of the Hall element in the Hall current sensor are exposed to the outside and will not be damaged after being electrically connected to the circuit board. The present invention also covers the protective shell 800 that houses the Hall current sensor with a shell shielding layer 802. This protective shell 800 encloses all parts of the Hall current sensor except the Hall element pins. This shielding layer 802 shields the Hall current sensor from external electromagnetic interference. Furthermore, the Hall element pins are generally located outside the protective shell 800, facilitating disassembly, installation, and replacement of the Hall element. In summary, the present invention enhances the anti-interference performance of the Hall current sensor and improves its detection accuracy.

[0052] The present invention also discloses a method for preparing the above-mentioned Hall current sensor with strong anti-interference properties, such as Figure 1-21 As shown, the following steps are included:

[0053] Hall element coating

[0054] Step 1. Continuously supplying the Hall element strips 100 into the shield layer attachment system;

[0055] Step 2. Control the film releasing device 300 of the shielding layer attaching system to continuously release the two shielding films 200 to the upper and lower ends of the Hall element strip 100;

[0056] Step 3. Control the hot pressing device 500 to hot press the two shielding films 200 onto the upper and lower ends of the pin strip of the Hall element strip 100;

[0057] Step 4. Control the film cutting device 600 to cut the shielding film 200 between two adjacent pins at the pin strip;

[0058] Step 5: Control the winding device 700 to wind up the coated and cut Hall element strip 100.

[0059] Assembly of Hall current sensor

[0060] S1. Remove each Hall element from the Hall element strip 100 after coating.

[0061] S2. Mount the Hall element on a circuit board and ensure that the pin end of the Hall element is electrically connected to the circuit board. The circuit board is constructed with a magnetic core, an excitation circuit, and a signal processing circuit to form a Hall current sensor with the Hall element;

[0062] S3. Install the assembled circuit board in the protective case 800.

[0063] The working principle and advantages of the present invention are: the present invention uses a shielding layer attaching system to batch coat the Hall elements with shielding film 200, thereby improving the coating efficiency of the pin shielding layer 201, coordinating with the subsequent assembly of the Hall current sensor, and improving the production and processing efficiency of the Hall current sensor.

[0064] As a preferred embodiment of the present invention, Figure 3 As shown, the Hall element strip 100 includes a connecting strip 103, on which multiple Hall elements are fixed at intervals along its length, thereby forming a strip-shaped structure. The Hall elements are fixed to the connecting strip 103 at the semiconductor pole pieces of the Hall elements. The semiconductor pole pieces of the Hall elements form a continuous semiconductor portion 101 at the connecting strip 103, and the pins of the Hall elements form a continuous pin portion 102 at the connecting strip 103. This facilitates the continuous processing of the Hall elements on the Hall element strip 100, improving processing efficiency.

[0065] As a preferred embodiment of the present invention, Figure 4 As shown, the film unwinding device 300 includes two film unwinding shafts 302 arranged in an upper and lower relative position. Each end of each film unwinding shaft 302 is rotatably connected to an adapter plate 301, and each adapter plate 301 is connected to the frame. A first transmission wheel 303 is coaxially mounted on one axial end of the film unwinding shaft 302, and the shielding film 200 is wound on the film unwinding shaft 302. In this embodiment, by driving the first transmission wheel 303 to rotate, it drives the film unwinding shaft 302 to rotate, thereby achieving the purpose of gradually unwinding the shielding film 200 on the film unwinding shaft 302, thereby achieving the purpose of continuously outputting the shielding film 200 to the hot pressing film device 500. The two film unwinding shafts 302 are also synchronized to achieve the purpose of continuously conveying the shielding film 200 to the upper and lower end surfaces of the pin portion 102 of the Hall element in the Hall element strip 100. In order to smoothly and gently supply the shielding film 200 to the hot pressing film device 500 and preheat the shielding film 200 so that the shielding film 200 can be fully hot-pressed onto the pins of the Hall element at the hot pressing film device 500, the measures taken in this embodiment are as follows: a guide preheating film device 400 is provided between the film unwinding device 300 and the hot pressing film device 500; the shielding film 200 is unwound from the film unwinding device 300, and then, after being guided by the guide preheating film device 400, continuously enters the hot pressing film device 500.

[0066] As a preferred embodiment of the present invention, Figure 4-6As shown, the guided preheating film device 400 includes two guided preheating roller groups, which are arranged in an upper and lower position relative to each other. Each guided preheating roller group includes multiple adjustable guide rollers, which are arranged in sequence along the conveying direction of the Hall element strip 100 and are inclined toward the Hall element strip 100. One of the adjustable guide rollers is connected to the transverse beam 401, and two adjacent adjustable guide rollers are connected via a connecting plate 402. Specifically, the adjustable guide roller includes a roller-shaped body 405, a first vertical adjustment screw 412, a transverse plate 404 and a connecting seat 403, wherein the two ends of the roller-shaped body 405 are respectively connected to the first shaft rods 406, and the two first shaft rods 406 coincide with the axis of the roller-shaped body 405. A vertical tube 407 is provided at each first shaft rod 406, and an adapter sleeve 408 is constructed at one end of the vertical tube 407 close to the first shaft rod 406. The adapter sleeve 408 is rotatably assembled on the first shaft rod 406, and a first electric heating wire is installed in the roller-shaped body 405 for heating the roller-shaped body 405, so that the roller-shaped body 405 preheats the shielding film 200 passing through the roller-shaped body 405. In this embodiment, a vertical rod 409 is movably inserted into the upper end of each vertical tube 407. The upper end of each vertical rod 409 passes through the transverse plate 404. A locking nut 410 is threadedly connected to the vertical rod 409. A telescopic spring 411 is sheathed around the vertical rod 409. The two ends of the telescopic spring 411 are respectively connected to the transverse plate 404 and the vertical tube 407. In this embodiment, a connecting seat 403 is provided above the transverse plate 404. A first vertical adjustment screw 412 is threadedly connected to the connecting seat 403. The lower end of the first vertical adjustment screw 412 is rotatably connected to the transverse plate 404. A first operating handwheel 413 is mounted on the upper end of the first vertical adjustment screw 412. At least one vertical guide rod 414 is constructed on the transverse plate 404. The upper end of the vertical guide rod 414 movably passes through the connecting seat 403. The working principle and advantages of this embodiment are: the shielding membrane 200 of this embodiment passes through the lower end of each adjustable guide roller in turn, and each roller-shaped body 405 is elastically pressed on the surface of the shielding membrane 200. During the transportation of the shielding membrane 200, the tension of the shielding membrane 200 changes, so that the force acting on the roller-shaped body 405 changes, thereby causing the roller-shaped body 405 to move vertically, and then causing the telescopic spring 411 to undergo elastic deformation. In order to enable the roller-shaped body 405 to be effectively pressed on the shielding film 200, this embodiment can rotate the first vertical adjustment screw 412 to drive the transverse plate 404 to move vertically, so that the transverse plate 404 drives the roller-shaped body 405 to gradually approach the shielding film 200 until the roller-shaped body 405 is effectively pressed on the surface of the shielding film 200; and since this embodiment adopts multiple adjustable guide rollers, the shielding film 200 can be smoothly transitioned to the hot pressing film device 500, ensuring that the shielding film 200 is stably transported into the hot pressing film device 500, avoiding the shielding film 200 from deflection, shaking, etc.

[0067] As a preferred embodiment of the present invention, Figure 7-10As shown, the hot lamination device 500 includes two vertical guide rail assemblies symmetrically mounted on either side of an assembly frame 501. Two hot lamination roller assemblies are positioned between the two vertical guide rail assemblies. These two hot lamination roller assemblies are symmetrically positioned at the upper and lower ends of the Hall element strip 100, and each hot lamination roller assembly is in driving connection with the two vertical guide rail assemblies. Each vertical guide rail assembly includes two vertical guide rails 502, which are spaced apart along the conveying direction of the Hall element strip 100. In this embodiment, each hot pressing film roller group includes two hot pressing rollers 503, and the two hot pressing rollers 503 are arranged at intervals along the conveying direction of the Hall element belt 100. A second shaft 505 is constructed at both axial ends of each hot pressing roller 503. The two second shafts 505 coincide with the axis of the hot pressing roller 503, and the two second shafts 505 are rotatably connected to a sliding block 509. Each sliding block 509 is slidably connected to the corresponding vertical guide rail 502, and a second vertical adjustment screw 510 is rotatably connected to each sliding block 509. The second vertical adjustment screw 510 is threadedly connected to the assembly frame 501, and a second operating hand wheel 511 is installed at the end of the second vertical adjustment screw 510 away from the sliding block 509. In this embodiment, one axial end of one of the hot pressing rollers 503 is coaxially connected to the output shaft of a drive motor 508, which is connected to a corresponding sliding block 509. In the hot pressing roller assembly, the two hot pressing rollers 503 are each equipped with a second transmission wheel 506 at the same end. The two second transmission wheels 506 are connected by a transmission belt 507. The two hot pressing rollers 503, which are arranged in an opposed manner, rotate in opposite directions. Rolling wheels 504 are coaxially mounted on the two second shafts 505 of each hot pressing roller 503. In this embodiment, two Hall element strips 100 are arranged opposite each other, with the two pin portions 102 of the two Hall element strips 100 close to each other and the two semiconductor portions 101 separated from each other. The hot pressing roller 503 rolls on the corresponding end faces of the two pin portions 102, and the two rolling wheels 504 roll on the corresponding end faces of the two semiconductor portions 101. The operating principle and advantages of this embodiment are as follows: By controlling the operation of two drive motors 508, the two hot-pressing roller groups operate synchronously. Thus, the two hot-pressing rollers 503, positioned opposite each other, simultaneously roll the upper and lower end surfaces of the two pin portions 102 in the two Hall element strips 100, thereby hot-pressing the two shielding films 200 onto the upper and lower end surfaces of the pin portions 102. Furthermore, the two rolling wheels 504 roll onto the corresponding end surfaces of the two semiconductor portions 101. The rolling wheels 504 ensure steady movement of the Hall element strips 100, preventing them from deflecting or loosening. To ensure that the shielding film 200 is securely hot-pressed onto the end surfaces of the pin portions 102, the hot-pressing roller group includes at least two hot-pressing rollers 503. This allows for multiple hot-pressing cycles of the shielding film 200.In this embodiment, the second vertical adjustment screw 510 can be rotated to drive the sliding block 509 to move vertically, thereby adjusting the vertical position of the hot pressing roller 503 to ensure that the hot pressing roller 503 can effectively hot press the shielding film 200 onto the pin portion 102.

[0068] As a preferred embodiment of the present invention, Figure 10-14 As shown, the hot press roller 503 includes a press roller body 5031, within which a second electric heating wire is disposed. A conductive slip ring 512 is mounted on a sliding block 509 connected to the press roller body 5031. The conductive slip ring 512 is electrically connected to the wire of the second electric heating wire. In this embodiment, a plurality of first assembly grooves 5032 are defined on the circumference of the press roller body 5031. These first assembly grooves 5032 are evenly spaced along the circumference of the press roller body 5031, each extending axially from one end of the press roller body 5031. A first operating port 5033 is defined at each axial end of the press roller body 5031. A plurality of first connection holes 5034 are defined on the press roller body 5031, located adjacent to each first operating port 5033. Each first connection hole 5034 communicates with a corresponding first assembly groove 5032. In this embodiment, a heat press strip 5037 or a sealing strip 5039 is installed in each first assembly groove 5032. The heat press strip 5037 is heat-pressed against the area between two adjacent pins in the Hall element, and the outer end surface of the sealing strip 5039 is heat-pressed against the end surface of the pins. The heat press strip 5037 is connected to the first assembly strip 5035 via a transition portion 5036. The first assembly strip 5035 is installed in the corresponding first assembly groove 5032 and then connected to the roller body 5031 via bolts. In this embodiment, the heat press strip 5037 can be replaced with different widths depending on the size of the gap between adjacent pins. The sealing strip 5039 of this embodiment is constructed with a second assembly strip 5038. This second assembly strip 5038 is installed in the corresponding first assembly groove 5032 and then connected to the roller body 5031 via bolts. In this embodiment, the number of heat press strips 5037 and sealing strips 5039 installed on the pressure roller body 5031 can be changed according to the spacing between two adjacent Hall elements on the Hall element strip 100, and the number of alternating intervals of the heat press strips 5037 and sealing strips 5039 can be adjusted, for example, a sealing strip 5039 is installed every other heat press strip 5037, or a sealing strip 5039 is installed every two heat press strips 5037, or two sealing strips 5039 are installed every other heat press strip 5037..., thereby ensuring that the heat press strip 5037 heat presses the shielding film 200 to the gap between adjacent pins, and ensuring that the sealing strip 5039 heat presses the shielding film 200 onto the end face of the pin.

[0069] As a preferred embodiment of the present invention, Figure 15-17 As shown, the film cutting device 600 includes two film cutting rollers 601, which are symmetrically arranged at the upper and lower ends of the Hall element strip 100. A third shaft 602 is connected to each axial end of each film cutting roller 601. The two third shafts 602 coincide with the axis of the film cutting roller 601. The two third shafts 602 are rotatably connected to two adapter arms 604, one of which is coaxially connected to the output shaft of the power motor 603. In this embodiment, the two adapter arms 604 located on the same side of the two film cutting rollers 601 are connected by a vertical adjustment rod 605. The vertical adjustment rod 605 is vertically spaced apart with a first threaded portion 607 and a second threaded portion 608 of opposite rotation directions. The first threaded portion 607 and the second threaded portion 608 are respectively threadedly connected to the two adapter arms 604. The lower end of the vertical adjustment rod 605 is rotatably connected to the assembly plate 606, and the upper end of the vertical adjustment rod 605 is mounted with a third operating handwheel 609. The working principle and advantages of this embodiment are as follows: By controlling the synchronous operation of two power motors 603, the two film cutting rollers 601 rotate relative to each other and cut the two Hall element strips 100 after lamination, so that the shielding film 200 on the Hall element strips 100 is cut with a longitudinal slit 202 and multiple transverse slits 203. The longitudinal slit 202 is formed in the area where the two pin portions 102 of the two Hall element strips 100 are close to each other, thereby separating the two Hall element strips 100. In some transverse slits 203, each transverse slit 203 is formed in the area between two adjacent pins on the Hall element strip 100, thereby separating the shielding film 200 at adjacent pins of the Hall element; in other transverse slits 203, each transverse slit 203 is formed in the area between adjacent pins of adjacent Hall elements, thereby separating the pins of adjacent Hall elements. In this embodiment, the vertical adjustment rod 605 can be rotated to drive the two film cutting rollers 601 to move closer to or farther from each other, so as to achieve the purpose of sufficient cutting by the two film cutting rollers 601.

[0070] As a preferred embodiment of the present invention, Figure 18-20As shown, the film cutting roller 601 includes a knife roller body 6011, an annular cutting knife 6012 is constructed in the middle of the knife roller body 6011, and the annular cutting knife 6012 coincides with the axis of the knife roller body 6011. A plurality of second assembly grooves 6013 are respectively provided on the outer peripheral wall of the knife roller body 6011 and on both sides of the annular cutting knife 6012, which are uniformly arranged along the circumference of the knife roller body 6011. Second operating ports 6014 are respectively provided at the axial ends of the knife roller body 6011. A plurality of second connection holes 6015 are defined at each second operating port 6014. Each second connection hole 6015 communicates with a corresponding second assembly slot 6013. A cutting blade 6017 is mounted within each second assembly slot 6013. Specifically, a third assembly strip 6016 is configured at the end of the cutting blade 6017 near the blade roller body 6011. This third assembly strip 6016 is mounted within the corresponding second assembly slot 6013 and then bolted to the blade roller body 6011. In this embodiment, the cutting blade 6017 cuts the area between adjacent pins, while the annular cutting blade 6012 cuts the area between the two pin portions 102 of the two Hall element strips 100. In this embodiment, the number of cutting strips 6017 installed on the knife roller body 6011 can be changed according to the spacing between two adjacent Hall elements on the Hall element strip 100, and the spacing between the cutting strips 6017 can be adjusted. For example, a cutting guide strip is installed in each second assembly groove 6013, or a cutting strip 6017 is installed every other third assembly strip 6016, or a third assembly groove is left empty after installing two consecutive third assembly grooves..., thereby ensuring that the cutting strip 6017 will be hot-pressed to cut the shielding film 200 between adjacent pins.

[0071] As a preferred embodiment of the present invention, Figure 21 As shown, the protective shell 800 is divided into two half shells, and a mounting cavity 801 is formed at the corresponding ends of the two half shells. The mounting cavity 801 is used to install various components of the Hall current sensor. The outer walls of the two half shells are respectively covered with a shell shielding layer 802.

[0072] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A method for preparing a Hall current sensor with strong anti-interference properties, characterized in that: The steps include: Hall element coating Step 1. Continuously supply the Hall element strips to the shield layer attachment system; Step 2. Control the film releasing device of the shielding layer attaching system to continuously release the two shielding films to the upper and lower ends of the Hall element strip; Step 3. Control the hot pressing device to hot press the two shielding films onto the upper and lower ends of the pin strip of the Hall element strip; Step 4. Control the film cutting device to cut the shielding film between two adjacent pins at the pin strip; Step 5. Control the winding device to wind up the coated and cut Hall element strip; Assembly of Hall current sensor S1. Remove the Hall elements from the laminated Hall element strip one by one; S2. Mount the Hall element on a circuit board and ensure that the pin end of the Hall element is electrically connected to the circuit board. The circuit board is constructed with a magnetic core, an excitation circuit, and a signal processing circuit to form a Hall current sensor with the Hall element; S3. Install the assembled circuit board in the protective case; The Hall current sensor with strong anti-interference performance includes a circuit board installed in a protective shell, a Hall element is installed on the circuit board, multiple pins of the Hall element are covered with a pin shielding layer, and the outer surface of the protective shell is covered with a shell shielding layer; The film unwinding device includes two film unwinding shafts arranged opposite to each other in an upper and lower direction, and both ends of the film unwinding shafts are rotatably connected to adapter plates, and a first transmission wheel is coaxially assembled at one axial end of the film unwinding shaft, and the shielding film is wound onto the film unwinding shaft; a guide preheating film device is arranged between the film unwinding device and the hot pressing film device, and the shielding film is unwound by the film unwinding device and enters the hot pressing film device after being guided by the guide preheating film device; the guide preheating film device includes two guide preheating roller groups arranged opposite to each other in an upper and lower direction, and each guide preheating roller group includes a plurality of adjustable guide rollers arranged in sequence along the conveying direction of the Hall element belt and inclined toward the Hall element belt, and one adjustable guide roller is selected to be connected to the transverse beam, and the two adjacent adjustable guide rollers are connected via a connecting plate; the adjustable guide The roller includes a roller-shaped body whose axial ends are rotatably connected to vertical tubes through first shafts, a first electric heating wire is installed in the roller-shaped body, a vertical rod is movably inserted at the upper end of each vertical tube, the upper end of each vertical rod passes through the transverse plate, a locking nut is threadedly connected to the vertical rod, a telescopic spring is sleeved on the outer side of the vertical rod, the two ends of the telescopic spring are respectively connected to the transverse plate and the vertical tube; a connecting seat is provided above the transverse plate, a first vertical adjusting screw is threadedly connected to the connecting seat, and the lower end of the first vertical adjusting screw is rotatably connected to the transverse plate, a first operating handwheel is installed at the upper end of the first vertical adjusting screw, and at least one vertical guide rod is constructed on the transverse plate, and the upper end of the vertical guide rod movably passes through the connecting seat.

2. The method for preparing a Hall current sensor with strong anti-interference according to claim 1, characterized in that: The hot pressing film device includes two vertical guide rail groups symmetrically installed on both sides of the assembly frame, and hot pressing film roller groups are symmetrically arranged between the two vertical guide rail groups and at the upper and lower ends of the Hall element belt. Each of the hot pressing film roller groups is transmission-connected to the two vertical guide rail groups.

3. The method for preparing a Hall current sensor with strong anti-interference according to claim 2, characterized in that: Each of the vertical guide rail groups includes two vertical guide rails spaced apart along the conveying direction of the Hall element belt, and each of the hot pressing film roller groups includes two hot pressing rollers spaced apart along the conveying direction of the Hall element belt, and the axial ends of each of the hot pressing rollers are rotatably connected to a sliding block through a second shaft, and each of the sliding blocks is slidably connected to the corresponding vertical guide rail, and a second vertical adjustment screw is rotatably connected to each sliding block, and the second vertical adjustment screw is threadedly connected to the assembly frame, and a second operating hand wheel is installed at the end of the second vertical adjustment screw away from the sliding block, and a hot pressing roller is installed at one axial end thereof. A driving motor is provided, and a second transmission wheel is respectively installed at the end portion on the same side of the two hot pressing rollers, and the two second transmission wheels are connected by a transmission belt; and the rotation directions of the two hot pressing rollers arranged opposite to each other in the two hot pressing film roller groups are opposite; rolling wheels are respectively coaxially installed on the two second shafts of the hot pressing roller, and there are two Hall element belts, which are arranged opposite to each other, and the two pin portions of the two Hall element belts are close to each other, and the two semiconductor portions are far away from each other, the hot pressing roller is rolled on the corresponding end surfaces of the two pin portions, and the two rolling wheels are rolled on the corresponding end surfaces of the two semiconductor portions respectively.

4. The method for preparing a Hall current sensor with strong anti-interference according to claim 3, characterized in that: The hot pressing roller includes a pressing roller body with a second electric heating wire built in, and a plurality of first assembly grooves are evenly opened along the circumference of the pressing roller body on the circumferential surface of the pressing roller body, each of the first assembly grooves extends out from the two ends of the pressing roller body along the axial direction of the pressing roller body, and a first operating port is respectively opened at the two axial ends of the pressing roller body, and a plurality of first connecting holes are respectively opened on the pressing roller body and located at each first operating port, and each first connecting hole is connected to the corresponding first assembly groove; a hot pressing strip or a sealing strip is installed in each first assembly groove, and the hot pressing strip is hot-pressed on the area between adjacent pins, and the outer end surface of the sealing strip is hot-pressed on the end surface of the pin.

5. The method for preparing a Hall current sensor with strong anti-interference according to claim 1, characterized in that: The film cutting device includes two film cutting rollers symmetrically arranged at the upper and lower ends of the Hall element strip, and the axial ends of each film cutting roller are rotatably connected to the two transfer arms through a third shaft, and one third shaft is selected to be connected to the power motor. The two transfer arms located on the same side of the two film cutting rollers are connected through a vertical adjustment rod, and a first threaded portion and a second threaded portion with opposite rotation directions are constructed on the vertical adjustment rod along the vertical interval. The first threaded portion and the second threaded portion are respectively threadedly connected to the two transfer arms, and the lower end of the vertical adjustment rod is rotatably connected to the assembly plate, and the upper end of the vertical adjustment rod is installed with a third operating handwheel.

6. The method for preparing a Hall current sensor with strong anti-interference according to claim 5, characterized in that: The film cutting roller includes an annular cutting knife coaxially constructed in the middle of the knife roller body, and a plurality of second assembly grooves uniformly arranged along the circumference of the knife roller body are respectively provided on the outer peripheral wall of the knife roller body and on both sides of the annular cutting knife, and second operating ports are respectively provided at the axial ends of the knife roller body, and a plurality of second connecting holes are provided on the knife roller body and at each second operating port, each of the second connecting holes is connected to the corresponding second assembly groove, and a cutting knife strip is installed in each second assembly groove, and the cutting knife strip cuts the area between adjacent pins, and the annular cutting knife cuts the area between two pin portions in two Hall element bands.

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