Hall current sensor

Abstract

The invention 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 in the circumferential direction of the magnetic ring is formed 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 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] The invention relates to the technical field of electromagnetic induction, and in particular to a Hall current sensor. Background Art

[0002] The Hall current sensor is a sensor that uses the Hall principle to measure current. Its measurement principle is: the Hall element is connected to an external power supply, so that there are conducting carriers (positive negative carriers) in the Hall element. Under the action of the magnetic field generated by the current to be measured (primary current), the positive negative carriers are deflected by the Lorentz magnetic force and accumulate 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 size of UH is related to the magnetic field strength B, and B is determined by the size of the current to be measured (primary current). Therefore, as long as UH is measured, the size of the current to be measured can be calculated in reverse, thereby measuring the current. Therefore, the Hall element does not need to directly contact the wire to be measured to measure the current size.

[0003] In the prior art, there is a Hall current sensor, which gathers the magnetic flux generated by the current to be measured through an annular magnetic core (also called a "magnetic ring") and concentrates it at the air gap (the gap between two arc-shaped magnetic cores). A Hall sensor (external power supply) is set at the air gap. The Hall sensor senses the magnetic flux of the primary current to form a Hall voltage, and then outputs the Hall voltage through components such as an amplifier to infer the magnitude of the current to be measured (primary current). However, many annular magnetic cores of existing Hall current sensors are composed of semicircular magnetic cores and arc-shaped magnetic cores. The position of the arc-shaped magnetic core in the circumferential direction is difficult to fix. Whether in assembly or use, the arc-shaped magnetic core may shift and affect the size of the air gap, which ultimately affects the accuracy of the detection result. Summary of the invention

[0004] The object of the present invention is to provide a Hall current sensor to solve the above-mentioned problem that the magnetic core of the existing Hall current sensor cannot be positioned.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is: a Hall current sensor, comprising a skeleton and two groups of first magnetic cores inserted on the skeleton, the two groups of first magnetic cores are spliced ​​to form a part of a magnetic ring, and there is a gap along the circumferential direction of the magnetic ring between the two groups of first magnetic cores, and the gap forms an air gap, the skeleton is provided with a limiting structure, and the first magnetic core is provided with an abutment structure, and the abutment 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.

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

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

[0008] In one embodiment, the skeleton includes a magnetic 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 installed by lateral insertion, and the two limiting walls are relatively arranged on the side walls of the magnetic core mounting groove.

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

[0010] In one embodiment, the skeleton is further provided with a circuit board mounting slot, a mounting hole is provided between the circuit board mounting slot and the magnetic core mounting slot, and the mounting hole is used to pass 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 abutment surface and the limiting wall are respectively perpendicular to the insertion direction of the first magnetic core, so that the limiting wall and the abutment surface form a planar abutment perpendicular to the insertion direction.

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

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

[0014] In one embodiment, the second magnetic core is installed in an upper cover, the frame and the first magnetic core are installed in a base, and the upper cover and the base are hinged.

[0015] In one embodiment, the base is provided with a rotating shaft and a clamping portion, and the rotating shaft and the clamping portion are respectively arranged on opposite sides of the base, and the upper cover is provided with a rotation groove corresponding to the rotating shaft and a clamping hole corresponding to the clamping portion, and an opening is provided on one side of the rotating groove. By means of the opening of the rotating groove, the rotating shaft and the rotating groove form a detachable connection, so that the upper cover and the base form a detachable hinge.

[0016] In one embodiment, the upper cover is provided with an installation opening, a buckle portion and an elastic pressing piece portion, the installation opening is used for allowing the second magnetic core to pass therethrough and be installed in the upper cover, the buckle portion is arranged on the inner side of the upper cover, the elastic pressing piece portion is arranged at the top end of the upper cover, the buckle portion is located between the elastic pressing piece portion and the installation opening, and the second magnetic core is fixed in the upper cover by utilizing the elasticity of the elastic pressing piece portion and the clamping and limiting position of the buckle portion.

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

[0018] In one embodiment, a wire protection frame is further provided on the skeleton, and at least a portion of the wire protection frame is located inside the magnetic ring, so as to form an isolation structure between the magnetic ring and the wire passing through the magnetic ring.

[0019] The beneficial effects of the present invention are:

[0020] 1. The limiting wall and the abutment surface are in contact with each other to limit the displacement of the first magnetic core in the magnetic ring ring direction, so that the first magnetic core is positioned in the magnetic ring ring direction, thereby overcoming the defect in the prior art that the arc-shaped magnetic core is difficult to position in the circumferential direction, improving the assembly accuracy and efficiency of the first magnetic core, and also facilitating the maintenance of 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 on the other hand, further ensuring the stability of the air gap.

[0022] 3. The second magnetic core is arranged on the upper cover, and forms a complete magnetic ring that can be opened and closed with the first magnetic core through the hinge between the upper cover and the base, so as to facilitate direct hanging line measurement (open and hang the Hall current sensor on the cable to be tested).

[0023] 4. The first magnetic core and the frame are bonded and fixed to further improve the stability of the first magnetic core. The wire protection frame arranged on the frame can prevent the wire to be tested from contacting the adhesive and the first magnetic core below, and is also beneficial to the isolation and voltage resistance between the wire to be tested and the circuit board with the Hall element. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional diagram of the upper cover of the embodiment of the present invention in an open state.

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

[0026] Figure 3 It is a front view of an embodiment of the present invention.

[0027] Figure 4 It is a left side view of an embodiment of the present invention.

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

[0029] Figure 6 yes Figure 5 A partial enlarged view of C.

[0030] Figure 7 It is a skeleton stereogram of an embodiment of the present invention.

[0031] Figure 8 It is a stereoscopic diagram of the assembly of the skeleton and the first magnetic core according to an embodiment of the present invention.

[0032] Fig. 9 It is a top view of the assembly of the skeleton and the first magnetic core of an embodiment of the present invention.

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

[0034] Fig.11 It is a three-dimensional diagram of the upper cover of an embodiment of the present invention.

[0035] Wherein: 10 magnetic ring, 101 air gap, 11 first magnetic core, 110 abutting 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 plug-in part, 5 base, 51 rotating shaft, 52 clamping part, 53 insertion port, 6 upper cover, 61 rotating groove, 611 rotating port, 62 clamping hole, 63 buckle part, 64 elastic pressing piece part, 65 installation opening, 66 arc groove. DETAILED DESCRIPTION

[0036] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which 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 contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0037] See also Figures 1 to 10As shown, the present invention discloses a Hall current sensor, including a magnetic ring 10, wherein the magnetic ring 10 is used to pass a conductor to be measured, an air gap 101 is provided on the ring of the magnetic ring 10, and a Hall element 21 connected to a circuit board 2 is provided in the air gap 101, so as to utilize the Hall principle to measure the current of the conductor to be measured, that is, the current to be measured.

[0038] The magnetic ring 10 includes a first magnetic core 11 and a second magnetic core 12, and the first magnetic core 11 and the second magnetic core 12 are spliced ​​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 the air gap 101 as the boundary. In this embodiment, each group of first magnetic cores 11 is a complete permanent magnet, and the two groups of first magnetic cores 11 are relatively inserted on the skeleton 3, and the joint of the two permanent magnets forms an air gap 101. In other embodiments, the number of each group of first magnetic cores 11 can also be formed by splicing two or more permanent magnets, and only a gap is reserved between two adjacent permanent magnets to form an air gap 101, and the other permanent magnets are abutted and matched in the circumferential direction of the magnetic ring 10 to form a group of first magnetic cores 11, so that there is no gap between adjacent permanent magnets or the gap is so small that it can be ignored.

[0039] The first magnetic cores 11 are spliced ​​in sequence to form a part of the magnetic ring 10, more specifically, two groups of first magnetic cores 11 are spliced ​​to form half of the magnetic ring 10, the skeleton 3 is provided with two limiting walls 31, and each group of first magnetic cores 11 is provided with abutment surfaces 110, the abutment surfaces 110 abut against the limiting walls 31 to limit the displacement of the first magnetic cores 11 in the circumferential direction of the magnetic ring 10, so that the first magnetic cores 11 are positioned in the circumferential direction of the magnetic ring 10.

[0040] The present invention forms the limitation of the first magnetic core 11 by the abutment between the limiting wall 31 on the skeleton 3 and the abutment surface 110, so that the first magnetic core 11 is positioned in the circumferential direction of the magnetic ring 10 to prevent the first magnetic core 11 from shifting in the circumferential direction of the magnetic ring 10 during use, thereby ensuring the stability of the air gap 101. In addition, the limiting wall 31 in the present embodiment limits the first magnetic core 11 in the insertion direction of the first magnetic core 11, so that the limiting wall 31 limits the first magnetic core 11 and can also form the installation positioning of the first magnetic core 11. During the installation process, the abutment surface 110 of the first magnetic core 11 abuts against the limiting wall 31, which means that the first magnetic core 11 is inserted into place. Therefore, there is no need to set up an external positioning device such as an installation jig to assist the installation of the first magnetic core 11.

[0041] The magnetic ring 10 is an annular structure, which can be a circular ring or a non-circular ring, such as a rectangular ring or other polygonal ring. The magnetic ring 10 of this embodiment is an annular 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 core 11 and the second magnetic core 12 are surrounded by a rectangular ring structure, which is conducive to maintaining the consistency of the width d of the air gap 101. The most ideal state is to make Figure 6 The width d of the middle air gap 101 is the same at all positions.

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

[0043] The first magnetic core 11 is not limited to plug-in installation, and the first magnetic core 11 can also be installed in the same direction, for example, plugged in in the same direction toward the direction where the second magnetic core 2 is located. At this time, the abutting surface 110 of the first magnetic core 11 is a plane facing the second magnetic core 2. In order to plug the first magnetic core 11 in the direction where the second magnetic core 2 is located, the structure of the skeleton 3 should also be changed accordingly, for example, the circuit board mounting groove 33 described later can be separately set on another part.

[0044] The limiting wall 31 and the abutting surface 110 are respectively perpendicular to the insertion direction of the first magnetic core 11, so that the limiting wall 31 and the abutting surface 110 form an abutting limit perpendicular to the insertion direction. The first magnetic core 11 is an L-shaped structure, so that the straight section of the limiting wall 31 forms a planar abutment with the first magnetic core 11 perpendicular to the insertion direction. The planar abutment perpendicular to the insertion direction makes the limitation between the first magnetic core 11 and the skeleton 3 more reliable. More specifically, the limiting wall 31 of this embodiment 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 abutting surface 110 of the first magnetic core 11 corresponds to the limiting wall 31, that is, the abutting surface 110 at this time 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 with the insertion direction. The two first magnetic cores 11 of this embodiment are installed by plugging in, and the relative arrangement of the two limiting walls 31 is more reasonable. In other embodiments, if the first magnetic cores 11 are inserted in the same direction, the two limiting walls 31 can be formed on the same plane.

[0045] The first magnetic core 11 is set to an L-shaped structure, which is convenient for forming the first magnetic core 11 in the circumferential direction of the magnetic ring 10 through a planar abutment with the limiting wall 31, 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 straight abutment surface on the inner side, and the straight abutment surface cooperates with the limiting wall to form a planar abutment. Relative to the first magnetic core 11 with an arc-shaped structure having a straight abutment surface on the inner side, the insertion direction of the first magnetic core 11 of the L-shaped structure is perpendicular to the abutment area limiting wall, which is conducive to constructing a planar abutment perpendicular to the insertion direction, making the limitation more reliable, and also improving the stability of the first magnetic core 11 after being limited. In addition, the rectangular ring structure magnetic ring 10 formed by the first magnetic core 11 and the second magnetic core 12 can improve the consistency of the width of the air gap 101 compared to the circular ring magnetic ring, that is, in the thickness direction of the first magnetic core 11, the width d of the air gap 101 at each position is smaller, so that the magnetic field is more stable and the accuracy of the Hall current sensor detection is higher, while the circular ring magnetic ring is not conducive to the consistency of the width of the air gap 101. That is, the L-shaped first magnetic core 11 is not only conducive to installation and limiting, but also conducive to the Hall current sensor to more accurately measure the current of the conductor to be measured.

[0046] In this embodiment, there are two limiting walls 31, and the number of permanent magnets forming a group of first magnetic cores 11 is also one. The limiting walls 31 match the number of permanent magnets forming the first magnetic cores 11, so that each limiting wall 31 limits a 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 abutment between the above-mentioned limiting wall 31 and the abutment surface 110 to limit the displacement of the first magnetic core 11 in the circumferential direction of the magnetic ring 10, a limiting structure for abutting the first magnetic core 11 can also be formed by setting limiting ribs on the skeleton 3. The limiting ribs can be set at the air gap 101 and formed on the skeleton 3 by injection molding. At this time, the end face of the first magnetic core 11 located at the air gap 101 forms an abutment surface, or an abutment groove or the like that can abut and cooperate with the limiting structure is set on the end face of the first magnetic core 11. The abutment surface or the abutment groove is one of the abutment structures, so as to form an abutment cooperation with the above-mentioned limiting structure.

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

[0049] The skeleton 3 is also provided with a circuit board mounting groove 33, and a mounting hole 34 is provided between the circuit board mounting groove 33 and the magnetic core mounting groove 32. The mounting hole 34 is used to pass the Hall element 21 so that the Hall element 21 extends from the circuit board mounting groove 33 to the air gap 101. The circuit board 2 provided with the Hall element 21 is installed in the circuit board mounting groove 33 of the skeleton 3, and the Hall element 21 passes through the mounting hole 34 and is arranged at the air gap 101. In addition to the mounting hole 34, a partition structure is provided between the circuit board mounting groove 33 and the magnetic core mounting groove 32, and the partition structure can form an installation and positioning structure of the first magnetic core 11 in a direction perpendicular to the limiting wall 31, which is conducive to the installation and positioning of the first magnetic core 11.

[0050] The circuit board 2 is provided with a Hall element 21 which is an electronic component necessary for measuring the current to be measured. The circuit connection structure of the circuit board 2 is a prior art and will not be described in detail here.

[0051] See also Figure 2 and Figure 5As shown, the skeleton 3 is also provided with a wire protection frame 4, at least a part of which is located inside the magnetic ring 10, so as to form 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 portion 42, the main body 41 is arranged inside the magnetic ring 10 to form an isolation structure, and the insertion portion 42 is arranged around the main body 41 to detachably install the wire protection frame 4 on the skeleton 3. Since the first magnetic core 11 is an L-shaped structure, a large rectangular cavity is left between the two first magnetic cores 11, which can be filled with more colloid to bond and fix the first magnetic core 11 and the skeleton 3; secondly, if there is no wire protection frame 4, the colloid on the skeleton 3 is exposed and may contact the wire to be tested, and the wire protection frame 4 can isolate the wire to be tested from the colloid and the first magnetic core 11, which is also conducive to the isolation and withstand voltage between the wire to be tested and the Hall element and the first magnetic core 11. In this embodiment, the isolation structure formed by the main body 41 on the inner side of the magnetic ring 10 is arc-shaped, and the arc-shaped isolation structure is closely matched with the structural shape of the wire to be tested, which is conducive to maintaining the stability of the wire to be tested. However, the isolation structure formed by the main body 41 is not limited to an arc shape, and can also be other structures, such as a multi-faceted shape formed by connecting multiple intersecting planes.

[0052] See also Figures 1 to 5 As shown, the second magnetic core 12 is installed in an upper cover 6, the skeleton 3 and the first magnetic core 11 are installed in a base 5, and the upper cover 6 and the base 5 are hinged. The first magnetic core 11 and the second magnetic core 12 are respectively arranged in 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 that the magnetic ring 10 is opened to surround the wire to be measured. In addition, the hinged structure between the upper cover 6 and the base 5 is also convenient for directly hanging on the wire to be measured after opening, that is, directly hanging the wire to measure the current of the wire to be measured.

[0053] The base 5 is provided with a rotating shaft 51 and a clamping part 52, which are respectively arranged on opposite sides of the base 5, and the upper cover 6 is provided with a rotating groove 61 corresponding to the rotating shaft 51 and a clamping hole 62 corresponding to the clamping part 52, and a rotating opening 611 is provided on one side of the rotating groove 61, and the rotating shaft 51 and the rotating groove 61 are detachably connected by means of the rotating opening 611 of the rotating groove 61, so that the upper cover 6 and the base 5 are detachably hinged. The upper cover 6 and the base 5 are connected by a detachable hinge, which can take into account the opening and closing of the magnetic ring 10, and is also convenient for installing the first magnetic core 11, the second magnetic core 12 and the skeleton 3. When removing the upper cover, the snap-in ears provided with the snap-in holes 62 are pried outward to disengage the snap-in holes 62 and the snap-in parts 52 of the base 5, and the upper cover 6 is rotated to open, and the upper cover 6 is rotated to make the rotating shaft 51 of the base 5 disengage from the rotating groove 61 at the rotating mouth 611 of the upper cover 6, so as to realize the removal of the upper cover 6 relative to the base 5; when installing, the structure on one side of the rotating groove 61 of the upper cover 6 is inserted into the hole on one side of the rotating shaft 51, so that the rotating shaft 51 enters into the rotating groove 61 from the rotating mouth 611, so that the upper cover 6 is hinged to the base 5, and then the snap-in holes 62 of the upper cover 6 are buckled with the snap-in parts 52 of the base 5, so as to realize the installation and fixation of the upper cover 6 and the base 5.

[0054] See also Figure 2 , Figure 5 and Fig.11 As shown, the upper cover 6 is further provided with a buckle portion 63 and an elastic pressing piece portion 64, wherein the buckle portion 63 is arranged on the inner side of the upper cover 6, and the elastic pressing piece portion is arranged on the top end of the upper cover 6, wherein the upper cover 6 is provided with a mounting opening 65 for loading the second magnetic core 12, and the end opposite to the mounting opening 65 is defined as the top end of the upper cover 6. The buckle portion 63 is located between the elastic pressing piece portion 64 and the mounting opening 65, so that when the second magnetic core 12 is installed, it is gradually pressed into the upper cover 6 from the mounting opening 65 until it crosses the buckle portion 63 and is elastically pressed against the elastic pressing piece portion 64, and the elasticity of the elastic pressing piece portion 64 and the clamping and limiting of the buckle portion 63 are used to fix the second magnetic core 12 in the upper cover 6, thereby maintaining the stability of the magnetic ring 10. The elastic pressing piece 64 is integrally formed on the upper cover 6. There is a certain distance between the two elastic pressing pieces 64 so that the elastic pressing piece 64 can be deformed to apply elastic force to the second magnetic core 12. In a natural state, the elastic pressing piece 64 is bent and extended in the direction of the installation opening 65 to apply pressure in the direction of the buckle portion 63 to the second magnetic core, and the second magnetic core 12 is fixed under the action of the buckle portion 63. An inclined surface is provided on one side of the buckle portion 63 facing the elastic pressing piece 64. When the second magnetic core 12 is only subjected to the elastic force of the elastic pressing piece 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 installation opening 65 continues to increase, the second magnetic core 12 will cross the inclined surface of the buckle portion 63 under the action of the pressure and come out of the installation 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 groove 66, which is arranged on both sides of the second magnetic core 12. The edges of the arc groove 66 and the main body 41 of the wire protection frame 4 are enclosed to form a measuring hole for passing the wire to be measured. The arc groove 66 makes a part of the inner wall of the upper cover 6 not in contact with the second magnetic core 12, and the buckle part 63 of the upper cover 6 is formed on the inner wall of this part, which is convenient for the layout of the buckle part 63 and also conducive to forming a limit for the wire to be measured. The magnetic ring 10 of this embodiment is a rectangular ring structure, and the wire to be measured is usually a round wire or a wire close to a round wire. This is also the reason why the magnetic ring 10 in the prior art is usually a circular ring structure, which is convenient for using the circular ring to form a limit for the wire to be measured. In this embodiment, the measuring hole close to the shape of a circular hole formed by the arc groove 66 and the main body 41 of the wire protection frame 4 can form a limit for the wire to be measured to a certain extent.

[0056] See also Figure 2 , Figure 5 , Figure 7 and Figure 8 As shown, in this embodiment, the skeleton 3 is inserted into the base 5, and one end of the base 5 is provided with an insertion port 53 for inserting the skeleton 3 therein, and the skeleton 3 and the base 5 are connected by snaps, and in the direction perpendicular to the insertion direction of the skeleton 3, the base 5 is an integrated structure arranged outside the skeleton 3. The snap connection between the skeleton 3 and the base 5 is achieved by the barb 35 arranged at the end of the skeleton 3 and the hook hole (the hook hole is not shown in the figure) arranged at the end of the base 5 away from the insertion port 53. Such a setting enables the base 5 to form an integrated structure arranged outside the skeleton 3, so that the inner wall of the base 5 can form a limit to the skeleton 3 and the first magnetic core 11 in the lateral direction of the skeleton 3. Compared with the split base formed by assembling the shell and the side plate in the prior art, the base 5 of the integrated structure of the present invention is simpler for the overall installation of the Hall current sensor (the side plate needs to be installed and fixed separately), and is conducive 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 plate and the shell, etc., which are relatively easy to shift, which is not conducive to the stability of the skeleton 3 and the first magnetic core 11. In addition, the base of the integrated structure of the present embodiment is more easily processed with structures such as convex ribs inside to strengthen the positioning of the frame 3 and the first magnetic core 11 .

[0057] See also Figure 1 and Figure 3As shown, in order to close the magnetic ring 10, the first magnetic core 11 and the second magnetic core 12 protrude from the base 5 and the upper cover 6 respectively, so that the first magnetic core 11 and the second magnetic core 12 are in contact with each other. In addition, the Hall current sensor of the present invention is an open-loop Hall current sensor, that is, no coil needs to be wound around the outside of the magnetic ring 10, and a part of the first magnetic core 11 can be exposed outside the skeleton 3. In the insertion direction of the first magnetic core 11, the space constructed by the limiting wall 31 of the skeleton 3 and the inner wall of the base 5 forms the limitation of the first magnetic core 11 in the insertion direction and the direction opposite to the insertion direction. The limitation in the insertion direction of the first magnetic core 11 is conducive to maintaining the minimum value of the air gap 101, and the limitation in the direction opposite to the insertion direction is conducive to maintaining the maximum value of the air gap 101. The skeleton 3 also does not need to be provided with a corresponding winding structure for winding the coil, so that the structure of the skeleton 3 is simpler.

[0058] The installation process of the Hall current sensor of the present invention is as follows: insert the circuit board 2 into the circuit board installation slot 33 of the skeleton 3 to install and fix it, and make the Hall element 21 pass through the installation hole 34; the two first magnetic cores 11 are inserted into the magnetic core installation slot 32 in sequence, and the side wall of the L-shaped first magnetic core 11 is abutted against the limiting wall 31 during the insertion process, and an air gap 101 is reserved between the two first magnetic cores 11 and the Hall element 21 is located in the air gap 101; the skeleton 3 equipped with the first magnetic core 11 and the circuit board 2 is inserted into the base 5, and the skeleton 3 and the base 5 are connected by snaps; the wire protection frame 4 is installed on the skeleton 3 to form an isolation structure inside the magnetic ring 10. The second magnetic core 12 is installed in the upper cover 6, and the second magnetic core 12 is fixed in the upper cover 6 by the snap portion 63 and the elastic pressing sheet portion 64 of the upper cover 6, and then the upper cover 6 with the second magnetic core 12 and the base 5 are snap-connected and locked to form a closed magnetic ring 10.

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

Claims

1. A Hall current sensor, characterized in that: It includes a skeleton and two groups of first magnetic cores inserted on the skeleton, the two groups of first magnetic cores are spliced ​​to form a part of a magnetic ring, there is a gap along the circumferential direction of the magnetic ring between the two groups of first magnetic cores, the gap forms an air gap, the skeleton is provided with a limiting structure, the first magnetic cores are provided with an abutment structure, the abutment 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: The two groups of the first magnetic cores are inserted into the frame relative to each other, and the limiting structure and the abutting structure are abutted and matched to form the limiting of the first magnetic core in the insertion direction.

4. A Hall current sensor according to claim 3, characterized in that: The skeleton comprises a magnetic core installation groove for installing the first magnetic core, the limiting structure is a limiting wall and there are two limiting walls, the first magnetic core is installed by lateral insertion, and the two limiting walls are arranged opposite to the side walls of the magnetic core installation groove.

5. A Hall current sensor according to claim 4, characterized in that: The limiting wall is provided with a glue injection groove, by means of which a portion of the first magnetic core is exposed, so that the first magnetic core and the frame are bonded and fixed by glue injection.

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

7. A Hall current sensor according to claim 4, characterized in that: The first magnetic core is an L-shaped structure, and the abutment surface and the limiting wall are respectively perpendicular to the insertion direction of the first magnetic core, so that the limiting wall and the abutment surface form a planar abutment 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 is an L-shaped structure, two groups of the first magnetic cores are arranged opposite to each other, and the second magnetic core is a half-frame structure, so that 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 in an upper cover, the frame and the first magnetic core are installed in a base, and the upper cover and the base are hinged.

11. A Hall current sensor according to claim 10, characterized in that: The base is provided with a rotating shaft and a clamping part, and the rotating shaft and the clamping part are respectively arranged on opposite sides of the base, and the upper cover is provided with a rotation groove corresponding to the rotating shaft and a clamping hole corresponding to the clamping part, and an opening is provided on one side of the rotating groove. By means of the opening of the rotating groove, the rotating shaft and the rotating groove form a detachable connection, so that the upper cover and the base form a detachable hinge.

12. A Hall current sensor according to claim 10, characterized in that: The upper cover is provided with an installation opening, a buckle portion and an elastic pressing piece portion. The installation opening is used for allowing the second magnetic core to pass therethrough and be installed in the upper cover. The buckle portion is arranged on the inner side of the upper cover, and the elastic pressing piece portion is arranged on the top end of the upper cover. The buckle portion is located between the elastic pressing piece portion and the installation opening. The second magnetic core is fixed in the upper cover by utilizing the elasticity of the elastic pressing piece portion and the clamping and limiting of the buckle portion.

13. A Hall current sensor according to claim 10, characterized in that: The frame is inserted into the base, one end of the base is provided with an insertion port for inserting the frame therein, the frame and the base are connected by a snap-fit, and in a direction perpendicular to the insertion direction of the frame, the base is an integrated structure arranged around the outside of the frame.

14. A Hall current sensor according to claim 1, characterized in that: A wire protection frame is also provided on the frame, and at least a part of the wire protection frame is located inside the magnetic ring, so as to form an isolation structure between the magnetic ring and the wire passing through the magnetic ring.

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