Hall current sensor

Abstract

The utility model relates to the technical field of electromagnetic induction, in particular to a Hall current sensor, which comprises a framework and two groups of first magnetic cores inserted on the framework, the two groups of first magnetic cores are spliced to form a part of a magnetic ring, a gap along the circumferential direction of the magnetic ring is arranged between the two groups of first magnetic cores, the gap forms an air gap, and the framework is provided with a limiting wall. The first magnetic core is provided with an abutting surface, and the abutting surface abuts against the limiting wall to limit the displacement of the first magnetic core in the annular direction of the magnetic ring, so that the first magnetic core is positioned in the annular direction of the magnetic ring. The limiting wall is arranged on the framework, the limiting wall abuts against the abutting face to limit the displacement of the first magnetic core in the circumferential direction of the magnetic ring, the first magnetic core is located in the circumferential direction of the magnetic ring, the defect that in the prior art, an arc-shaped magnetic core is difficult to locate in the circumferential direction is overcome, the assembling precision and efficiency of the first magnetic core are improved, and the assembling efficiency of the first magnetic core is improved. And the stability of the air gap is maintained, so that the detection accuracy of the Hall current sensor is ensured.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic induction technology, specifically to a Hall current sensor. Background Technology

[0002] A Hall current sensor is a sensor that uses the Hall principle to measure current. Its measurement principle is as follows: An external power supply is connected to the Hall element, creating conductive charge carriers (positive load carriers) within the element. These positive load carriers are deflected by the Lorentz force under the influence of the magnetic field generated by the measured current (primary current), accumulating on both sides of the Hall element to form a potential difference. According to the Hall voltage calculation formula UH = RH * I * B / δ, the magnitude of UH is related to the magnetic field strength B, which is determined by the magnitude of the measured current (primary current). Therefore, by measuring UH, the magnitude of the measured current can be calculated, thus achieving current measurement. Therefore, the Hall element does not need to directly contact the conductor being measured to measure the current.

[0003] Existing technology includes a Hall current sensor that uses a toroidal magnetic core (also called a "magnetic ring") to concentrate the magnetic flux generated by the current to be measured at an air gap (the gap between two arc-shaped magnetic cores). A Hall sensor (externally powered) is placed at the air gap. The Hall sensor senses the magnetic flux of the primary current to form a Hall voltage, which is then output by an amplifier and other components to calculate the magnitude of the current to be measured (primary current). However, the toroidal magnetic core of existing Hall current sensors is often composed of a semi-circular core and an arc-shaped core. The position of the arc-shaped core in the circumferential direction is difficult to fix. Whether during assembly or use, the arc-shaped core may shift, affecting the size of the air gap and ultimately the accuracy of the detection results. Summary of the Invention

[0004] The purpose of this invention is to provide a Hall current sensor to solve the problem that the magnetic core of existing Hall current sensors cannot be positioned.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: a Hall current sensor, comprising a frame and two sets of first magnetic cores inserted on the frame, the two sets of first magnetic cores being spliced ​​together to form part of a magnetic ring, the two sets of first magnetic cores having a gap along the circumferential direction of the magnetic ring, the gap forming an air gap, the frame having a limiting structure, the first magnetic core having an abutting structure, the abutting structure abutting against the limiting structure to limit the displacement of the first magnetic core in the circumferential direction of the magnetic ring, so that the first magnetic core is positioned in the circumferential direction of the magnetic ring.

[0006] In one embodiment, the limiting structure is a limiting wall, and the abutting structure is an abutting surface.

[0007] In one embodiment, two sets of the first magnetic cores are inserted into the skeleton relative to each other, and the limiting structure and the abutting structure abut against each other to limit the first magnetic core in its insertion direction.

[0008] In one embodiment, the skeleton includes a core mounting groove for mounting the first magnetic core, the limiting structure is a limiting wall and there are two limiting walls, the first magnetic core is inserted and mounted laterally, and the two limiting walls are disposed opposite to each other on the sidewalls of the core mounting groove.

[0009] In one embodiment, the limiting wall is provided with an injection groove, by means of which a portion of the first magnetic core is exposed, thereby the first magnetic core and the skeleton are bonded and fixed by injection.

[0010] In one embodiment, the skeleton is further provided with a circuit board mounting slot, and a mounting hole is provided between the circuit board mounting slot and the magnetic core mounting slot. The mounting hole is used to pass through the Hall element so that the Hall element can extend from the circuit board mounting slot to the air gap.

[0011] In one embodiment, the first magnetic core is an L-shaped structure, and the abutting surface and the limiting wall are respectively perpendicular to the insertion direction of the first magnetic core, so that the limiting wall and the abutting surface form a plane abutting perpendicular to the insertion direction.

[0012] In one embodiment, a second magnetic core is further included, which is spliced ​​with the first magnetic core to form a complete magnetic ring.

[0013] In one embodiment, the first magnetic core has an L-shaped structure, two sets of the first magnetic cores are arranged opposite each other, and the second magnetic core has a semi-frame structure, so that the magnetic ring becomes a rectangular ring structure.

[0014] In one embodiment, the second magnetic core is installed inside a top cover, the frame and the first magnetic core are installed inside a base, and the top cover and the base are hinged together.

[0015] In one embodiment, the base has a pivot and a snap-fit ​​part, the pivot and the snap-fit ​​part are respectively disposed on opposite sides of the base, the top cover has a rotating groove corresponding to the pivot and a snap-fit ​​hole corresponding to the snap-fit ​​part, one side of the rotating groove has an opening, the pivot and the rotating groove are detachably connected by means of the opening of the rotating groove, so that the top cover and the base are detachably hinged.

[0016] In one embodiment, the upper cover has an installation opening, a snap-fit ​​portion, and an elastic pressure plate portion. The installation opening is used for the second magnetic core to pass through and be installed inside the upper cover. The snap-fit ​​portion is located on the inner side of the upper cover, and the elastic pressure plate portion is located at the top of the upper cover. The snap-fit ​​portion is located between the elastic pressure plate portion and the installation opening. The second magnetic core is fixed inside the upper cover by the elasticity of the elastic pressure plate portion and the locking and limiting of the snap-fit ​​portion.

[0017] In one embodiment, the skeleton is inserted into the base, one end of the base is provided with an insertion port for inserting the skeleton therein, the skeleton and the base are connected by a snap fastener, and in the direction perpendicular to the insertion direction of the skeleton, the base is an integral structure surrounding the skeleton.

[0018] In one embodiment, the skeleton is further provided with a wire protection frame, at least a portion of which is located inside the magnetic ring, thereby forming an isolation structure between the magnetic ring and the wires passing through the magnetic ring.

[0019] The beneficial effects of this utility model are:

[0020] 1. By forming an abutment with the limiting wall and the abutting surface, the displacement of the first magnetic core in the upward direction of the magnetic ring is restricted, so that the first magnetic core is positioned in the upward direction of the magnetic ring. This overcomes the defect in the prior art that the arc-shaped magnetic core is difficult to position in the circumferential direction, improves the assembly accuracy and efficiency of the first magnetic core, and is also conducive to maintaining the stability of the air gap, thereby ensuring the detection accuracy of the Hall current sensor.

[0021] 2. The L-shaped first magnetic core cooperates with the limiting wall, which improves the convenience of installation on the one hand, and further improves the stability of the first magnetic core through the surface contact between the first magnetic core and the limiting wall, thus further ensuring the stability of the air gap.

[0022] 3. The second magnetic core is set on the upper cover and forms an openable and closable complete magnetic ring with the first magnetic core through the hinge between the upper cover and the base, which facilitates direct wire measurement (opening it allows the Hall current sensor to be suspended on the cable under test).

[0023] 4. The first magnetic core and the frame are bonded and fixed together, which further improves the stability of the first magnetic core. The wire protection frame set on the frame can prevent the wire under test from contacting the adhesive and the first magnetic core below, and also facilitates the isolation and withstand voltage between the wire under test and the circuit board with Hall element. Attached Figure Description

[0024] Figure 1 This is a perspective view of the top cover in the open state of an embodiment of this utility model.

[0025] Figure 2This is an exploded view of an embodiment of the present invention.

[0026] Figure 3 This is a front view of an embodiment of the present utility model.

[0027] Figure 4 This is a left view of an embodiment of the present utility model.

[0028] Figure 5 yes Figure 4 AA sectional view.

[0029] Figure 6 yes Figure 5 A magnified view of a portion of the image, C.

[0030] Figure 7 This is a three-dimensional view of the skeleton of an embodiment of this utility model.

[0031] Figure 8 This is a perspective view of the skeleton and the first magnetic core assembly of an embodiment of this utility model.

[0032] Figure 9 This is a top view of the skeleton and the first magnetic core assembly of an embodiment of this utility model.

[0033] Figure 10 yes Figure 9 BB cross-sectional view.

[0034] Figure 11 This is a perspective view of the top cover of an embodiment of this utility model.

[0035] The components are as follows: 10 magnetic ring, 101 air gap, 11 first magnetic core, 110 contact surface, 12 second magnetic core, 2 circuit board, 21 Hall element, 3 skeleton, 31 limiting wall, 311 glue injection groove, 32 magnetic core mounting groove, 320 limiting baffle structure, 33 circuit board mounting groove, 34 mounting hole, 35 barb, 4 wire protection frame, 41 main body, 42 insertion part, 5 base, 51 rotating shaft, 52 snap-fit ​​part, 53 insertion port, 6 top cover, 61 rotating groove, 611 rotating port, 62 snap-fit ​​hole, 63 snap-fit ​​part, 64 elastic pressing part, 65 mounting opening, and 66 arc groove. Detailed Implementation

[0036] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0037] See Figures 1 to 10As shown, this utility model discloses a Hall current sensor, including a magnetic ring 10, in which a wire to be measured is threaded. The magnetic ring 10 has an air gap 101 on the ring side, and a Hall element 21 connected to the circuit board 2 is disposed in the air gap 101, thereby using the Hall principle to measure the current of the wire to be measured, i.e., the current to be measured.

[0038] The magnetic ring 10 includes a first magnetic core 11 and a second magnetic core 12, which are spliced ​​together along the circumferential direction of the magnetic ring 10 to form a complete magnetic ring. The first magnetic core 11 is divided into two groups along the circumferential direction of the magnetic ring 10, with an air gap 101 as the boundary. In this embodiment, each group of first magnetic cores 11 is a complete permanent magnet. The two groups of first magnetic cores 11 are inserted opposite each other on the frame 3, and the splicing point of the two permanent magnets forms an air gap 101. In other embodiments, each group of first magnetic cores 11 can also be formed by splicing two or more permanent magnets. Only a gap needs to be reserved between two adjacent permanent magnets to form an air gap 101. The other permanent magnets are joined together in the circumferential direction of the magnetic ring 10 to form a group of first magnetic cores 11, so that there is no gap or the gap between adjacent permanent magnets is so small that it can be ignored.

[0039] Each first magnetic core 11 is sequentially spliced ​​to form a part of the magnetic ring 10, more specifically, two sets of first magnetic cores 11 are spliced ​​to form half of the magnetic ring 10. The frame 3 is provided with two limiting walls 31, and each set of first magnetic cores 11 is provided with an abutting surface 110. The abutting surface 110 abuts against the limiting wall 31 to limit the displacement of the first magnetic core 11 in the circumferential direction of the magnetic ring 10, so that the first magnetic core 11 is positioned in the circumferential direction of the magnetic ring 10.

[0040] This invention uses the contact between the limiting wall 31 on the frame 3 and the contact surface 110 to limit the first magnetic core 11, thereby positioning the first magnetic core 11 in the circumferential direction of the magnetic ring 10. This prevents the first magnetic core 11 from shifting along the circumferential direction of the magnetic ring 10 during use, thus ensuring the stability of the air gap 101. Furthermore, in this embodiment, the limiting wall 31 limits the first magnetic core 11 in the insertion direction, thus also providing installation positioning for the first magnetic core 11. During installation, the first magnetic core 11 is considered to be inserted into place when the contact surface 110 of the first magnetic core 11 abuts against the limiting wall 31. Therefore, no additional external positioning devices such as installation fixtures are needed to assist in the installation of the first magnetic core 11.

[0041] The magnetic ring 10 is a ring structure, which can be circular or non-circular, such as a rectangular ring or other polygonal ring. In this embodiment, the magnetic ring 10 is a ring structure formed by splicing two L-shaped first magnetic cores 11 and a half-frame-shaped second magnetic core 12. That is, the first magnetic cores 11 and the second magnetic cores 12 together form a rectangular ring structure, which is beneficial to maintaining the consistency of the width d of the air gap 101. The ideal state is to make... Figure 6 The width d is the same at all positions of the air gap 101.

[0042] The insertion direction of the first magnetic core 11 is parallel to the plane of the circumferential direction of the magnetic ring 10. After the two first magnetic cores 11 are inserted, they form half of the magnetic ring 10. The limiting wall 31 is located on the inner side of the magnetic ring 10. Thus, when the first magnetic core 11 is installed, its contact surface 110 abuts against the limiting wall 31, which indicates that it is installed in place. This is conducive to the quick and accurate installation of the first magnetic core 11.

[0043] The first magnetic core 11 is not limited to interlocking installation. The first magnetic core 11 can also be installed in the same direction, for example, in the same direction toward the direction of the second magnetic core 2. In this case, the contact surface 110 of the first magnetic core 11 is a plane facing the second magnetic core 2. In order to insert the first magnetic core 11 toward the direction of the second magnetic core 2, the structure of the frame 3 should also be changed accordingly. For example, the circuit board mounting slot 33 described later can be set separately on another part.

[0044] The limiting wall 31 and the abutment surface 110 are perpendicular to the insertion direction of the first magnetic core 11, thus forming an abutment limit perpendicular to the insertion direction. The first magnetic core 11 has an L-shaped structure, so the straight section of the limiting wall 31 abuts against the first magnetic core 11 in a plane perpendicular to the insertion direction. The plane abutment perpendicular to the insertion direction makes the limiting between the first magnetic core 11 and the frame 3 more reliable. More specifically, in this embodiment, the limiting wall 31 is a plane perpendicular to the insertion direction. In other embodiments, the limiting wall 31 can also be an inclined surface with a certain angle to the insertion direction. The abutment surface 110 of the first magnetic core 11 corresponds to the limiting wall 31, that is, the abutment surface 110 is also an inclined surface with a certain angle to the insertion direction, and the surface abutment formed by the two also has an angle to the insertion direction. In this embodiment, the two first magnetic cores 11 are installed in a plug-in configuration, and the layout of the two limiting walls 31 being arranged opposite each other is more reasonable. In other embodiments, if the first magnetic cores 11 are installed in the same direction, the two limiting walls 31 can be formed on the same plane.

[0045] The first magnetic core 11 is configured with an L-shaped structure, which facilitates its contact with the limiting wall 31 through planar contact, thereby limiting the first magnetic core 11 in the upward direction of the magnetic ring 10, maintaining the stability of the first magnetic core 11 and the air gap, and improving the accuracy of the measurement. In other embodiments, the first magnetic core 11 can also be an arc-shaped structure with a flat contact surface on its inner side, which cooperates with the limiting wall to form a planar contact. Compared with the arc-shaped structure with a flat contact surface on its inner side, the insertion direction of the L-shaped first magnetic core 11 is perpendicular to the contact area limiting wall, which is beneficial to constructing a planar contact perpendicular to the insertion direction, making the limiting more reliable, and also improving the stability of the first magnetic core 11 after being limited. Furthermore, the rectangular ring structure of the magnetic ring 10 formed by the first magnetic core 11 and the second magnetic core 12 improves the uniformity of the air gap 101 width compared to a circular magnetic ring. Specifically, the width difference d at various positions of the air gap 101 is smaller along the thickness direction of the first magnetic core 11, resulting in a more stable magnetic field and higher accuracy of the Hall current sensor. A circular magnetic ring, on the other hand, is detrimental to the uniformity of the air gap 101 width. In other words, the L-shaped structure of the first magnetic core 11 not only facilitates installation and positioning but also allows the Hall current sensor to more accurately measure the current in the conductor under test.

[0046] In this embodiment, there are two limiting walls 31, and the number of permanent magnets forming a set of first magnetic cores 11 is also one. The number of limiting walls 31 matches the number of permanent magnets forming the first magnetic core 11, so that each limiting wall 31 limits one permanent magnet. In other embodiments, the number of limiting walls 31 can be more than two, and match the number of permanent magnets constituting the first magnetic core 11.

[0047] In addition to the aforementioned limiting wall 31 and abutting surface 110 abutting to restrict the upward displacement of the first magnetic core 11 in the magnetic ring 10, a limiting structure for the first magnetic core 11 to abut can also be formed by limiting ribs provided on the frame 3. The limiting ribs can be provided at the air gap 101 and are injection molded on the frame 3. At this time, the end face of the first magnetic core 11 located at the air gap 101 forms an abutting surface, or an abutting groove or other abutting structure that can abut with the limiting structure is provided on the end face of the first magnetic core 11. The abutting surface or the abutting groove are both types of abutting structures, so as to form an abutting fit with the aforementioned limiting structure.

[0048] See Figures 5 to 10As shown, the frame 3 includes a core mounting groove 32 for mounting the first magnetic core 11, and two limiting walls 31 are disposed opposite to each other on the sidewalls of the core mounting groove 32. In addition to the limiting walls 31, limiting baffle structures 320 are also provided on both sides of the core mounting groove 32 in the axial direction of the magnetic ring 10 (i.e., the extension direction of the wire to be tested inside the magnetic ring 10), so as to limit the first magnetic core 11 in the axial direction of the magnetic ring 10, so that the first magnetic core 11 and the second magnetic core 12 can be spliced ​​to form a complete magnetic ring 10. The limiting wall 31 is provided with an injection groove 311, which exposes a part of the first magnetic core 11 to the frame 3, so that the first magnetic core 11 and the frame 3 are bonded and fixed by injection. Since the two first magnetic cores 11 are inserted into the frame 3, the injection of glue into the space between the two first magnetic cores 11 can bond and fix the two first magnetic cores 11 and the frame 3, further improving the stability of the first magnetic core 11 and the air gap 101.

[0049] The frame 3 also has a circuit board mounting slot 33, and a mounting hole 34 is provided between the circuit board mounting slot 33 and the magnetic core mounting slot 32. The mounting hole 34 is used to pass through the Hall element 21 so that the Hall element 21 can extend from the circuit board mounting slot 33 to the air gap 101. The circuit board 2 with the Hall element 21 is installed in the circuit board mounting slot 33 of the frame 3, and the Hall element 21 passes through the mounting hole 34 and is located at the air gap 101. In addition to the mounting hole 34, a partition structure is provided between the circuit board mounting slot 33 and the magnetic core mounting slot 32. This partition structure can form a mounting and positioning structure for the first magnetic core 11 in the direction perpendicular to the limiting wall 31, which is beneficial for the mounting and positioning of the first magnetic core 11.

[0050] The circuit board 2 is equipped with Hall element 21, which is the electronic component necessary for measuring the current to be measured. The circuit connection structure of the circuit board 2 is existing technology and will not be described in detail here.

[0051] See Figure 2 and Figure 5As shown, the frame 3 is also provided with a wire protection frame 4, at least a portion of which is located inside the magnetic ring 10, thereby forming an isolation structure between the magnetic ring 10 and the wires passing through the magnetic ring. More specifically, the wire protection frame 4 includes a main body 41 and an insertion part 42. The main body 41 is disposed inside the magnetic ring 10 to form an isolation structure, and the insertion part 42 is disposed around the main body 41 to detachably install the wire protection frame 4 onto the frame 3. Since the first magnetic core 11 has an L-shaped structure, a large rectangular cavity is left between the two first magnetic cores 11, which can be filled with more glue to bond and fix the first magnetic core 11 and the frame 3. Secondly, without the wire protection frame 4, the glue on the frame 3 would be exposed and may come into contact with the wire under test. The wire protection frame 4 can isolate the wire under test from the glue and the first magnetic core 11, and also facilitates the isolation withstand voltage between the wire under test and the Hall element and the first magnetic core 11. In this embodiment, the isolation structure formed inside the magnetic ring 10 by the main body 41 is arc-shaped. The arc-shaped isolation structure fits the structural shape of the wire under test well, which is beneficial to maintaining the stability of the wire under test. However, the isolation structure formed by the main body 41 is not limited to arc shape, but can also be other structures, such as a multi-faceted shape formed by the connection of multiple intersecting planes.

[0052] See Figures 1 to 5 As shown, the second magnetic core 12 is installed inside an upper cover 6, and the frame 3 and the first magnetic core 11 are installed inside a base 5. The upper cover 6 and the base 5 are hinged together. The first magnetic core 11 and the second magnetic core 12 are respectively disposed inside the hinged base 5 and the upper cover 6, so that the first magnetic core 11 and the second magnetic core 12 form a relatively movable connection, that is, the magnetic ring 10 forms an openable and closable structure, so as to open the magnetic ring 10 and surround the wire to be tested. In addition, the hinged structure between the upper cover 6 and the base 5 also facilitates direct suspension on the wire to be tested after opening, that is, direct wire suspension for measuring the current of the wire to be tested.

[0053] The base 5 has a rotating shaft 51 and a snap-fit ​​part 52, which are respectively located on opposite sides of the base 5. The upper cover 6 has a rotating groove 61 corresponding to the rotating shaft 51 and a snap-fit ​​hole 62 corresponding to the snap-fit ​​part 52. A rotating opening 611 is provided on one side of the rotating groove 61. The rotating shaft 51 and the rotating groove 61 are detachably connected by the rotating opening 611 of the rotating groove 61, so that the upper cover 6 and the base 5 are detachably hinged. The detachable hinged connection between the upper cover 6 and the base 5 can accommodate the opening and closing of the magnetic ring 10 and facilitate the installation of the first magnetic core 11, the second magnetic core 12, and the frame 3. When disassembling the top cover, pry open the snap-fit ​​ear with snap-fit ​​hole 62 outward to disengage the snap-fit ​​hole 62 from the snap-fit ​​part 52 of the base 5, rotate to open the top cover 6, and rotate the top cover 6 to make the rotating shaft 51 of the base 5 disengage from the rotating opening 611 of the top cover 6 and exit the rotating groove 61, thereby disassembling the top cover 6 relative to the base 5. When installing, insert the structure on one side of the rotating groove 61 of the top cover 6 into the hole on one side of the rotating shaft 51, so that the rotating shaft 51 enters the rotating groove 61 from the rotating opening 611, forming the top cover 6 hinged to the base 5. Then, fasten the snap-fit ​​hole 62 of the top cover 6 to the snap-fit ​​part 52 of the base 5 to install and fix the top cover 6 to the base 5.

[0054] See Figure 2 , Figure 5 and Figure 11 As shown, the upper cover 6 also has a snap-fit ​​part 63 and an elastic pressing part 64. The snap-fit ​​part 63 is located on the inner side of the upper cover 6, and the elastic pressing part is located on the top of the upper cover 6. The upper cover 6 has an installation opening 65 for inserting the second magnetic core 12, and the end opposite to the installation opening 65 is defined as the top of the upper cover 6. The snap-fit ​​part 63 is located between the elastic pressing part 64 and the installation opening 65, so that when the second magnetic core 12 is installed, it is gradually pressed into the upper cover 6 from the installation opening 65 until it passes over the snap-fit ​​part 63 and is elastically pressed against the elastic pressing part 64. The elasticity of the elastic pressing part 64 and the locking and limiting of the snap-fit ​​part 63 fix the second magnetic core 12 in the upper cover 6, maintaining the stability of the magnetic ring 10. The elastic pressing portion 64 is integrally formed on the upper cover 6. There is a certain distance between the two elastic pressing portions 64 so that the elastic pressing portions 64 can deform and apply elastic force to the second magnetic core 12. In its natural state, the elastic pressing portion 64 bends and extends in the direction of the mounting opening 65 to apply pressure to the second magnetic core in the direction of the latching portion 63, and fixes the second magnetic core 12 under the action of the latching portion 63. The side of the latching portion 63 facing the elastic pressing portion 64 is provided with a slope. When the second magnetic core 12 is only subjected to the elastic force of the elastic pressing portion 64, the second magnetic core 12 is fixed in the upper cover 6. When the pressure on the second magnetic core 12 in the direction of the mounting opening 65 continues to increase, the second magnetic core 12 will cross the slope of the latching portion 63 under the action of the pressure and disengage from the mounting opening 65, so as to facilitate the disassembly and replacement of the second magnetic core 12.

[0055] The upper cover 6 is provided with an arc-shaped groove 66, which is located on both sides of the second magnetic core 12. The edge of the arc-shaped groove 66 and the main body 41 of the wire protection frame 4 enclose each other to form a measuring hole for the wire to be tested. The arc-shaped groove 66 ensures that a portion of the inner wall of the upper cover 6 does not contact the second magnetic core 12. The latching part 63 of the upper cover 6 is formed on this portion of the inner wall, which facilitates the layout of the latching part 63 and also helps to limit the wire to be tested. In this embodiment, the magnetic ring 10 is a rectangular ring structure, while the wire to be tested is usually a circular or nearly circular wire. This is why the magnetic ring 10 in the prior art is usually a circular ring structure, which facilitates the use of a circular ring to limit the wire to be tested. In this embodiment, the measuring hole formed by the arc-shaped groove 66 and the main body 41 of the wire protection frame 4, which is close to the shape of a circular hole, can limit the wire to be tested to a certain extent.

[0056] See Figure 2 , Figure 5 , Figure 7 and Figure 8 As shown, in this embodiment, the skeleton 3 is inserted into the base 5. One end of the base 5 is provided with an insertion port 53 for inserting the skeleton 3. The skeleton 3 and the base 5 are connected by a snap-fit. In the direction perpendicular to the insertion direction of the skeleton 3, the base 5 is an integral structure surrounding the skeleton 3. The snap-fit ​​connection between the skeleton 3 and the base 5 is achieved by a barb 35 provided at the end of the skeleton 3 and a hook hole (not shown in the figure) provided at the end of the base 5 away from the insertion port 53. This arrangement allows the base 5 to form an integral structure surrounding the skeleton 3, so that the inner wall of the base 5 can form a limiting position on the skeleton 3 and the first magnetic core 11 in the lateral direction of the skeleton 3. Compared with the separate base formed by assembling the outer shell and side plates in the prior art, the integral structure of the base 5 of this utility model makes the overall installation of the Hall current sensor simpler (the side plates need to be installed and fixed separately), and is beneficial to the stability of the skeleton 3 and the first magnetic core 11 in the base 5, because there will be seams between the side plates and the outer shell, which are relatively easier to shift and are not conducive to the stability of the skeleton 3 and the first magnetic core 11. Furthermore, the integrated base structure of this embodiment makes it easier to process internal structures such as ribs to strengthen the positioning of the frame 3 and the first magnetic core 11.

[0057] See Figure 1 and Figure 3As shown, to close the magnetic ring 10, the first magnetic core 11 and the second magnetic core 12 protrude from the base 5 and the top cover 6 respectively, thus abutting against each other. Furthermore, the Hall current sensor of this invention is an open-loop Hall current sensor, meaning that no coil needs to be wound around the outside of the magnetic ring 10, and a portion of the first magnetic core 11 can be exposed outside the frame 3. In the insertion direction of the first magnetic core 11, the space constructed by the limiting wall 31 of the frame 3 and the inner wall of the base 5 forms a limiting position for the first magnetic core 11 in both the insertion and reverse insertion directions. The limiting position in the insertion direction helps maintain the minimum value of the air gap 101, while the limiting position in the reverse insertion direction helps maintain the maximum value of the air gap 101. The frame 3 also does not need a corresponding winding structure for winding the coil, making the structure of the frame 3 simpler.

[0058] The installation process of the Hall current sensor of this utility model is as follows: The circuit board 2 is inserted into the circuit board mounting slot 33 of the frame 3 for installation and fixation, and the Hall element 21 passes through the mounting hole 34; two first magnetic cores 11 are sequentially inserted into the magnetic core mounting slots 32, with the sidewall of the L-shaped first magnetic core 11 abutting against the limiting wall 31 during insertion. An air gap 101 is reserved between the two first magnetic cores 11, and the Hall element 21 is positioned within this air gap 101; the frame 3 containing the first magnetic core 11 and the circuit board 2 is inserted into the base 5, and the frame 3 and the base 5 are connected by a snap fastener; a wire protection frame 4 is installed on the frame 3, forming an isolation structure inside the magnetic ring 10. The second magnetic core 12 is installed inside the upper cover 6, and the second magnetic core 12 is fixed inside the upper cover 6 by the snap fastener 63 and the elastic pressing plate 64. Then, the upper cover 6 with the second magnetic core 12 and the base 5 are snapped together and locked to form a closed magnetic ring 10.

[0059] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that the remaining undescribed parts are prior art, and that all changes in form and detail made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims fall within the protection scope of the present invention.

Claims

1. A Hall current sensor, characterized in that: The device includes a frame and two sets of first magnetic cores inserted on the frame. The two sets of first magnetic cores are spliced ​​together to form part of a magnetic ring. There is a gap between the two sets of first magnetic cores along the circumferential direction of the magnetic ring, and the gap forms an air gap. The frame is provided with a limiting structure, and the first magnetic core is provided with an abutting structure. The abutting structure abuts against the limiting structure to limit the displacement of the first magnetic core in the circumferential direction of the magnetic ring, so that the first magnetic core is positioned in the circumferential direction of the magnetic ring.

2. A Hall current sensor according to claim 1, characterized in that: The limiting structure is a limiting wall, and the abutting structure is an abutting surface.

3. A Hall current sensor according to claim 2, characterized in that: Two sets of the first magnetic cores are inserted into the skeleton relative to each other, and the limiting structure and the abutting structure abut against each other to limit the first magnetic core in its insertion direction.

4. A Hall current sensor according to claim 3, characterized in that: The frame includes a core mounting groove for mounting the first magnetic core, and the limiting structure is a limiting wall, and there are two limiting walls. The first magnetic core is inserted and mounted laterally, and the two limiting walls are disposed opposite to each other on the sidewalls of the core mounting groove.

5. A Hall current sensor according to claim 4, characterized in that: The limiting wall is provided with an injection groove, which exposes a portion of the first magnetic core, thereby bonding and fixing the first magnetic core and the frame together by injection.

6. A Hall current sensor according to claim 4, characterized in that: The frame is also provided with a circuit board mounting slot, and a mounting hole is provided between the circuit board mounting slot and the magnetic core mounting slot. The mounting hole is used to pass through the Hall element so that the Hall element can extend from the circuit board mounting slot to the air gap.

7. A Hall current sensor according to claim 4, characterized in that: The first magnetic core has an L-shaped structure, and the abutting surface and the limiting wall are respectively perpendicular to the insertion direction of the first magnetic core, so that the limiting wall and the abutting surface form a plane abutting perpendicular to the insertion direction.

8. A Hall current sensor according to claim 1, characterized in that: It also includes a second magnetic core, which is spliced ​​with the first magnetic core to form a complete magnetic ring.

9. A Hall current sensor according to claim 8, characterized in that: The first magnetic core has an L-shaped structure, and two sets of the first magnetic cores are arranged opposite each other. The second magnetic core has a semi-frame-shaped structure, so the magnetic ring becomes a rectangular ring structure.

10. A Hall current sensor according to claim 8, characterized in that: The second magnetic core is installed inside an upper cover, and the frame and the first magnetic core are installed inside a base, with the upper cover and the base forming a hinge.

11. A Hall current sensor according to claim 10, characterized in that: The base is provided with a rotating shaft and a snap-fit ​​part, which are respectively arranged on opposite sides of the base. The upper cover is provided with a rotating groove corresponding to the rotating shaft and a snap-fit ​​hole corresponding to the snap-fit ​​part. One side of the rotating groove is provided with an opening, which allows the rotating shaft to form a detachable connection with the rotating groove, thereby forming a detachable hinge between the upper cover and the base.

12. A Hall current sensor according to claim 10, characterized in that: The upper cover is provided with an installation opening, a snap-fit ​​part, and an elastic pressure plate part. The installation opening is used for the second magnetic core to pass through and be installed inside the upper cover. The snap-fit ​​part is located on the inner side of the upper cover, and the elastic pressure plate part is located at the top of the upper cover. The snap-fit ​​part is located between the elastic pressure plate part and the installation opening. The second magnetic core is fixed inside the upper cover by the elasticity of the elastic pressure plate part and the locking and limiting of the snap-fit ​​part.

13. A Hall current sensor according to claim 10, characterized in that: The skeleton is inserted into the base, and one end of the base is provided with an insertion port for inserting the skeleton. The skeleton and the base are connected by a snap fastener. In the direction perpendicular to the insertion direction of the skeleton, the base is an integral structure surrounding the skeleton.

14. A Hall current sensor according to claim 1, characterized in that: The frame is also provided with a wire protection frame, at least a portion of which is located inside the magnetic ring, thereby forming an isolation structure between the magnetic ring and the wires passing through the magnetic ring.

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