Magnetic core assembly and open-loop Hall current sensor

Abstract

The utility model provides a magnetic core assembly and an open-loop Hall current sensor, the magnetic core assembly comprises two magnetic cores which are symmetrically arranged, two air gaps are respectively formed between two groups of opposite end parts of the two magnetic cores, the magnetic core assembly also comprises two connecting sheets and two air gap pieces, the connecting sheets are used for grounding, the two connecting sheets are respectively corresponding to the two air gaps, and the two air gap pieces are respectively connected with the two air gaps. The shell is provided with two air gaps and is used for connecting the side faces of the two magnetic cores, the two air gap pieces are arranged at the two air gaps respectively, each air gap piece is provided with a groove used for containing the Hall element and two bearing parts arranged in a protruding mode, and the two bearing parts make contact with the top faces of the two magnetic cores respectively and are used for pressing the bottom faces of the two magnetic cores on the inner surface of the shell. According to the scheme, the magnetic core is grounded through the connecting piece, the sheet-shaped connecting piece can be in contact with the side face of the magnetic core conveniently, the grounding design of the magnetic core is optimized, and the production efficiency of the magnetic core is improved; the arrangement of the connecting piece and the air gap piece can ensure that the two ends of the magnetic core forming the air gap are kept in a positioning and aligning state, and the magnetic leakage phenomenon is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of sensors, and in particular relates to a magnetic core component and an open-loop Hall current sensor. Background Art

[0002] An open-loop Hall effect current sensor consists of a Hall element, a magnetic core with an air gap made of soft magnetic material, and an appropriate amplifier circuit. The operating process is as follows: the Hall element detects the magnetic induction intensity generated by the primary current in the magnetic core's air gap. The output voltage of the Hall element is adjusted and amplified by the amplifier to a 0-4V or 0-5V output. Because this current sensor operates in an open loop structure, it is called an open-loop Hall effect current sensor.

[0003] However, in order to improve the linear measurement range of the Hall current sensor, the air gap width of the magnetic core must be increased or the number of air gaps must be increased. This also increases the leakage flux at the air gap of the magnetic core, resulting in a decrease in the Hall current sensor's ability to resist electromagnetic interference. To improve the Hall current sensor's ability to resist electromagnetic interference, domestic and foreign manufacturers generally use grounding the magnetic core and wrapping copper tape around the outside of the magnetic core to shield the air gap of the magnetic core. However, this magnetic core structure has the following problems:

[0004] 1) When copper tape is wrapped around the outside of the magnetic core to shield the air gap of the magnetic core, it is difficult to process and fix the copper tape on the outside of the magnetic core; and it is difficult to operate when the magnetic core wrapped with copper tape is installed on the shell, which greatly reduces production efficiency; the copper tape is used more materials, which also increases the cost in mass production; this is laborious and does not improve the anti-interference ability of the open-loop Hall current sensor much;

[0005] 2) The core structure is unstable as a whole, and it is difficult to ensure that the two ends of the core forming the air gap remain aligned, further increasing the risk of magnetic leakage.

[0006] In view of this, it is particularly important to design and manufacture a magnetic core and an open-loop Hall current sensor that can overcome the above problems. Utility Model Content

[0007] In view of the technical problems of low production efficiency, high cost and unstable structure in the prior art, the utility model proposes a magnetic core component and an open-loop Hall current sensor.

[0008] In the first aspect, the utility model proposes a magnetic core assembly, comprising two symmetrically arranged magnetic cores, two air gaps are respectively formed between two groups of opposite ends of the two magnetic cores, and also comprising two connecting plates and two air gap parts, the connecting plates are used for grounding, the two connecting plates respectively correspond to the two air gaps, and are used to connect the side surfaces of the two magnetic cores, the two air gap parts are respectively arranged at the two air gaps, each of the air gap parts is provided with a groove for accommodating a Hall element and two protruding receiving parts, the two receiving parts respectively contact the top surfaces of the two magnetic cores, and are used to press the bottom surfaces of the two magnetic cores against the inner surface of the shell; wherein the top surface and the bottom surface are two opposite surfaces on the magnetic core, and the side surface is the surface on the magnetic core connecting the top surface and the bottom surface.

[0009] The magnetic core in this technical solution is grounded via a connecting piece. The sheet-shaped connecting piece facilitates contact with the side of the magnetic core and is connected by welding, riveting, or other methods, optimizing the magnetic core grounding design and improving the production efficiency of the magnetic core. The two connecting pieces correspond to two air gaps and connect the side surfaces of the two magnetic cores. The connecting pieces can be used to limit the freedom of the two magnetic cores in a direction perpendicular to the side, thereby preventing the two magnetic cores from being misaligned in the direction perpendicular to the side. The two receiving portions on each air gap member contact the top surfaces of the two magnetic cores and are used to press the bottom surfaces of the two magnetic cores against the inner surface of the shell. The receiving portions and the inner surface of the shell can be used to limit the freedom of the two magnetic cores in a direction perpendicular to the top or bottom surface, thereby preventing the two magnetic cores from being misaligned in the direction perpendicular to the top or bottom surface. Therefore, it is possible to ensure that the two ends of the magnetic core forming the air gap remain aligned, reducing magnetic leakage.

[0010] Preferably, the two magnetic cores enclose a detection channel, wherein one of the two side surfaces of the magnetic core facing the detection channel is an inner side surface, and the other side surface facing away from the detection channel is an outer side surface, and the connecting piece connects the outer side surfaces.

[0011] By adopting the above technical solution, the two magnetic cores are enclosed to form a detection channel, and the connecting piece is connected to the outer side of the magnetic core, which can achieve various technical effects such as optimizing the detection channel, rationally utilizing space, enhancing structural stability and facilitating installation and maintenance.

[0012] Preferably, the side walls of the air gap member abut against the opposite ends of the magnetic core and the side walls of the connecting piece respectively.

[0013] By adopting the above technical solution, the abutment design and the fixing effect of the connecting piece are used to improve the stability of the entire structure, reduce the vibration and displacement that may occur during use, thereby ensuring the accuracy and reliability of the measurement; further improve the anti-interference ability of the open-loop Hall current sensor, and ensure accurate measurement of the current.

[0014] Preferably, a reinforcement portion is provided at the connection between the receiving portion and the air gap member.

[0015] By adopting this technical solution, the reinforcement significantly improves the connection strength and stability between the receiving portion and the air gap. This ensures the core maintains reliable performance during operation, improving the accuracy of current measurement and the overall quality of the product. Furthermore, the high-strength reinforcement further ensures the core's application in harsh environments.

[0016] Preferably, an air gap opening is provided on the air gap member, the air gap opening is located on a side close to the connecting piece, and the air gap member is L-shaped.

[0017] By adopting the above technical solution, the specific position of the air gap optimizes the magnetic field distribution, improves the measurement performance of the Hall element, and also facilitates installation and maintenance, and enhances the overall stability of the magnetic core.

[0018] Further preferably, the size of the air gap opening is at least one quarter of the area of ​​the air gap member.

[0019] By adopting the above technical solutions, the design can increase the amount of magnetic field passing through and improve the Hall element's sensitivity to magnetic fields, thereby enhancing measurement accuracy and sensitivity. When determining the size of the air gap, it was found that within this size range, the air gap can maximize measurement performance while maintaining structural stability.

[0020] Preferably, the thickness of the air gap member is 2 to 10 mm.

[0021] By adopting the above technical solution, the thickness range of the air gap is selected based on factors such as magnetic field characteristics, mechanical strength, and heat dissipation performance. Different thicknesses affect the distribution and intensity of the magnetic field in the air gap, as well as the heat dissipation capacity of the air gap. This design allows for the selection of an appropriate air gap thickness based on specific application requirements and operating environment.

[0022] Preferably, one of the connecting pieces is provided with a protruding lead pin for grounding.

[0023] By adopting the above technical solution, the ground pin can effectively conduct static electricity and stray current in the circuit to the ground, improving the safety and stability of the system. When designing the pin, this application took into account the principle and importance of grounding and selected an appropriate grounding location and method.

[0024] Preferably, the magnetic core and the connecting piece are made of the same material, and are connected to each other by riveting.

[0025] By adopting the above technical solution, the magnetic core and the connecting piece are made of the same material, which can avoid the connecting piece from affecting the magnetic field of the magnetic core, and ensure good electromagnetic compatibility and mechanical strength; the riveted connection between the magnetic core and the connecting piece has high connection strength and reliability, so that the two iron cores, two connecting pieces and two air gap parts form an integral structure.

[0026] In the second aspect, the utility model also proposes an open-loop Hall current sensor, including a shell and a circuit board, and also including the magnetic core described in the first aspect, the magnetic core is installed in the shell, the circuit board is installed on the surface of the magnetic core, the pins of the Hall element and the lead pins on the connecting piece are respectively electrically connected to the circuit board, and a glue-filled surface is provided in the shell to encapsulate the magnetic core to form a complete open-loop Hall current sensor.

[0027] By adopting the above technical solution, the open-loop Hall effect current sensor has high-performance current measurement. Combined with optimized magnetic core and circuit board processing, it can achieve accurate and stable current measurement. It has high reliability and stability. The potting surface packaging and reasonable structural layout improve the sensor's anti-interference ability and mechanical stability. It is easy to install and use. The housing provides a mounting interface, and the surface mounting method of the circuit board facilitates connection and integration with other electronic components.

[0028] Compared with the prior art, the beneficial results of the present invention are:

[0029] The magnetic core is grounded through a connecting piece. The sheet-shaped connecting piece is easy to contact with the side of the magnetic core and is connected by welding, riveting, etc., which optimizes the design of the magnetic core grounding and improves the production efficiency of the magnetic core.

[0030] The two connecting pieces correspond to the two air gaps respectively and connect the side surfaces of the two magnetic cores. The connecting pieces can be used to limit the freedom of the two magnetic cores in a direction perpendicular to the side surfaces, thereby preventing the two magnetic cores from being misaligned in the direction perpendicular to the side surfaces.

[0031] The two receiving parts on each air gap member respectively contact the top surfaces of the two magnetic cores and are used to press the bottom surfaces of the two magnetic cores against the inner surface of the shell. The receiving parts and the inner surface of the shell can be used to limit the freedom of the two magnetic cores in the direction perpendicular to the top surface or bottom surface, thereby avoiding the freedom of the two magnetic cores in the direction perpendicular to the top surface or bottom surface.

[0032] Therefore, it is possible to ensure that the two ends of the magnetic core forming the air gap remain aligned, thereby reducing magnetic leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated into and constitute a part of this specification. The accompanying drawings illustrate the embodiments and, together with the description, serve to explain the principles of the present invention. Other embodiments and many of the expected advantages of the embodiments will be readily apparent as they become better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale with respect to each other. Like reference numerals designate corresponding similar parts.

[0034] Figure 1 1 shows a schematic diagram of the overall structure of a magnetic core assembly according to embodiment 1 of the present utility model;

[0035] Figure 2 A schematic diagram showing a prominent air gap opening in a magnetic core assembly according to embodiment 1 of the present utility model is shown;

[0036] Figure 3 FIG1 shows a schematic structural diagram of an air gap member according to Example 1 of the present utility model;

[0037] Figure 4 FIG2 shows a schematic diagram of the overall structure of an open-loop Hall current sensor according to Example 2 of the present utility model;

[0038] Figure 5 A schematic structural diagram of an open-loop Hall current sensor according to Example 2 of the present utility model is shown, with the housing and the glue-filled surface removed.

[0039] The meaning of each number in the figure is: 1. Magnetic core; 2. Connecting piece; 3. Air gap part; 31. Supporting part; 32. Reinforcement part; 33. Air gap opening; 34. Groove; 4. Air gap; 5. Lead-out pin; 6. Shell; 7. Circuit board; 8. Glue filling surface. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are intended only to illustrate the relevant utility model and are not intended to limit the scope of the utility model. It should also be noted that, for ease of description, only portions relevant to the relevant utility model are shown in the accompanying drawings.

[0041] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0042] Example 1:

[0043] In the first aspect, the utility model discloses a magnetic core assembly, such as Figure 1As shown, the magnetic core 1 assembly includes two symmetrically arranged magnetic cores, two air gaps 4 are formed between the two opposite ends of the two magnetic cores 1, and also includes two connecting plates 2 and two air gap parts 3. The connecting plates 2 are used for grounding. The two connecting plates 2 correspond to the two air gaps 4 respectively and are used to connect the side surfaces of the two magnetic cores 1. The two air gap parts 3 are respectively arranged at the two air gaps 4. Each air gap part 3 is provided with a groove 34 for accommodating a Hall element and two protruding receiving portions 31. The two receiving portions 31 respectively contact the top surfaces of the two magnetic cores 1 and are used to press the bottom surfaces of the two magnetic cores 1 against the inner surface of the shell 6; wherein the top surface and the bottom surface are two opposite surfaces on the magnetic core 1, and the side surface is the surface on the magnetic core 1 connecting the top surface and the bottom surface.

[0044] In this embodiment, the two magnetic cores 1 are grounded through the connecting piece 2. The sheet-shaped connecting piece 3 is convenient for contacting the side of the magnetic core 1 and is connected by welding, riveting, etc., which optimizes the grounding design of the magnetic core 1 and improves the production efficiency of the magnetic core 1.

[0045] The two connecting pieces 2 correspond to the two air gaps 4 respectively and connect the side surfaces of the two magnetic cores 1. The connecting pieces 2 can be used to limit the freedom of the two magnetic cores 1 in the direction perpendicular to the side surfaces, thereby preventing the two magnetic cores 1 from being misaligned in the direction perpendicular to the side surfaces.

[0046] The two receiving portions 31 on each air gap member 3 respectively contact the top surfaces of the two magnetic cores 1 and are used to press the bottom surfaces of the two magnetic cores 1 against the inner surface of the shell. The receiving portions 31 and the inner surface of the shell 6 can be used to limit the freedom of the two magnetic cores 1 in the direction perpendicular to the top surface or bottom surface, thereby avoiding the freedom of the two magnetic cores 1 in the direction perpendicular to the top surface or bottom surface.

[0047] This ensures that the two ends of the magnetic core 1 forming the air gap 4 remain aligned, reducing magnetic flux leakage. This improves the stability of the entire structure, reduces potential vibration and displacement during use, and thus ensures measurement accuracy and reliability. It also further enhances the open-loop Hall current sensor's anti-interference capability, ensuring accurate current measurement.

[0048] Further, such as Figure 2 and 3 As shown, the tops of both side walls of the air gap member 3 that abut against the magnetic core 1 are protruding with receiving portions 31, which abut against the top surface of the magnetic core 1. A reinforcing portion 32 is provided at the connection between the receiving portion 31 and the air gap member 3.

[0049] In this embodiment, the design of the receiving portion 31 improves the installation stability and sealing of the air gap member 3 in the magnetic core 1. Specifically, the receiving portion 31 increases the contact area between the air gap member 3 and the magnetic core 1, making the installation more secure and reducing position changes caused by vibration or external forces. At the same time, the elastic deformation of the tightening method can adapt to different installation tolerances and working environments to a certain extent, ensuring good sealing. This structural design helps to improve the position accuracy of the Hall element in the air gap 4, thereby improving the accuracy and reliability of current measurement and enabling the magnetic core 1 to adapt to a wider range of working environments.

[0050] The reinforcement 32 significantly enhances the connection strength and stability between the receiving portion 31 and the air gap 3. This ensures that the magnetic core 1 maintains reliable performance during operation, improving the accuracy of current measurement and the overall quality of the product. Furthermore, the high strength of the reinforcement 32 further enhances the durability of the magnetic core 1 in harsh environments.

[0051] It should be noted that the specific structural design of the receiving portion 31 and the reinforcing portion 32 can be designed according to actual needs and is not specifically limited as long as it can achieve the required functions.

[0052] Specifically, such as Figure 1 and Figure 3 As shown, the air gap member 3 has an air gap opening 33 located on a side close to the connecting piece 2. In this embodiment, the air gap member is L-shaped, and the size of the air gap opening 33 is at least one-fourth the area of ​​the air gap member 3. The thickness of the air gap member 3 is 2-10 mm. The width of the groove 34 is at least one-half the thickness of the air gap member 3. The thickness of the air gap member 3 is preferably 5 mm.

[0053] The air gap 3 is made of a soft magnetic material and is used to form an air gap 4 in the magnetic core 1. The air gap 4 prevents the magnetic core from saturating, thereby improving the linear measurement range of the sensor. Preferably, it is made of ferrite, permalloy, etc.

[0054] In this embodiment, the position selection of the air gap member 3 and the air gap opening 33 has the following advantages: First, proximity to the connecting piece 2 allows the air gap opening 33 to be located in a region of relatively stable magnetic field, which is conducive to the accurate sensing of the magnetic field by the Hall element. Through analysis of the magnetic field distribution, we found that this position enables the magnetic field to pass through the air gap opening 33 more concentratedly, thereby improving the measurement accuracy and sensitivity of the Hall element. Second, when installing and maintaining the Hall element, the air gap opening 33 close to the connecting piece 2 provides a larger operating space, making the installation and replacement process more convenient and quick. In addition, the supporting role of the connecting piece 2 also helps to improve the stability of the air gap opening 33 and reduce the deformation and displacement of the air gap member 3 during use.

[0055] Further, such as Figure 3 As shown, designing air gap 33 to be at least one-quarter the area of ​​air gap 3 increases magnetic field throughput, improving the Hall element's sensitivity to magnetic fields, and thus enhancing measurement accuracy and sensitivity. When determining the size of air gap 33, it was found that within this size range, air gap 33 maximizes measurement performance while maintaining structural stability.

[0056] The thickness of the air gap 3 is selected within a range of 2 to 10 mm, taking into account factors such as magnetic field characteristics, mechanical strength, and heat dissipation performance. Different thicknesses affect the distribution and intensity of the magnetic field in the air gap 4, as well as the heat dissipation capacity of the air gap 3. The appropriate thickness of the air gap 3 can be selected based on specific application requirements and operating environment.

[0057] In this embodiment, if Figure 1 As shown, the magnetic core 1 and the connecting piece 2 are made of the same material and are connected by riveting. One of the connecting pieces 2 is provided with a protruding lead 5 for grounding. The grounded lead 5 can effectively conduct static electricity and stray currents in the circuit to the ground, improving the safety and stability of the system. When designing the lead 5, this application took into account the principle and importance of grounding and selected an appropriate grounding location and method.

[0058] The magnetic core 1 and the connecting piece 2 are made of the same material to avoid the connecting piece 2 from affecting the magnetic field of the magnetic core 1, thereby ensuring good electromagnetic compatibility and mechanical strength; the riveted connection between the magnetic core 1 and the connecting piece 2 has high connection strength and reliability, so that the two cores, the two connecting pieces 2 and the two air gap parts 3 together form an integral structure.

[0059] Specifically, the magnetic core 1 is typically made of a soft magnetic material, such as ferrite or Permalloy. In this embodiment, the magnetic core 1 is a U-shaped iron core constructed from multiple laminated silicon steel sheets; the connecting piece 2 is also made of silicon steel sheets. The connecting piece 2, made of silicon steel sheets, and the core work together in the open-loop Hall effect current sensor to form a stable and efficient magnetic circuit system. This synergistic effect improves sensor performance, reduces costs, and enhances product reliability.

[0060] In this embodiment, the silicon steel sheets are arranged on the side of the iron core, and the silicon steel sheets are connected to each other by riveting. The riveting method is, for example, opening holes on the iron core and the silicon steel sheets, and passing rivets through the holes on the iron core and the silicon steel sheets for connection, so that the two iron cores, the two silicon steel sheets, and the two air gap parts 3 form an integral structure.

[0061] In other embodiments, the iron core and the silicon steel sheets may also be connected by laser welding, which is not specifically limited here.

[0062] The technical solution of the present invention integrates the air gap member at the opening of the magnetic core through a reasonable layout, making the entire magnetic core 1 more compact, saving space, and convenient for installation in various devices; through the abutment design and the fixing effect of the connecting piece, the stability of the entire structure is improved, and the vibration and displacement that may occur during use are reduced, thereby ensuring the accuracy and reliability of the measurement; and further improving the anti-interference ability of the open-loop Hall current sensor, ensuring accurate measurement of the current.

[0063] Example 2:

[0064] In the second aspect, the present invention also discloses an open-loop Hall current sensor, such as Figure 4 and 5 As shown, it includes a shell 6 and a circuit board 7, and also includes the magnetic core 1 of the first aspect. The magnetic core 1 is installed in the shell 6, and the circuit board 7 is installed on the surface of the magnetic core 1. The pins of the Hall element and the lead pins 5 on the connecting piece 2 are electrically connected to the circuit board 7 respectively. A glue-filling surface 8 is provided in the shell 6 to encapsulate the magnetic core 1 to form a complete open-loop Hall current sensor.

[0065] In this embodiment, the glue-filled surface 8 is formed by pouring glue into the housing 6 after the components inside the housing 6 are installed, and the glue is solidified to form the glue-filled surface 8. This process is a conventional technical means in this field and will not be described in detail here.

[0066] The glue potting surface 8 plays a crucial role in the open-loop Hall effect current sensor. It provides physical protection for the magnetic core 1, circuit board 7, and connecting parts, helping to improve the sensor's reliability and stability, extending its service life. After curing, the glue potting surface 8 securely secures the magnetic core 1 and circuit board 7 within the housing 6, preventing them from shifting or loosening during sensor operation. This helps ensure stable sensor performance and enhances measurement accuracy.

[0067] This open-loop Hall current sensor features high-performance current measurement. Combined with optimized magnetic core 1 and circuit board 7 processing, it enables accurate and stable current measurement. It also boasts high reliability and stability, and the encapsulation of the potting surface 8 and a rational structural layout enhance the sensor's anti-interference capability and mechanical stability. It is also easy to install and use, with the housing 6 providing a mounting interface and the surface mounting of the circuit board 7 facilitating connection and integration with other electronic components.

[0068] This embodiment utilizes an innovative open-loop Hall effect current sensor design. An optimized magnetic core 1 is combined with a housing and circuit board, and then encapsulated using a potting process to create a complete open-loop Hall effect current sensor. Electrical connections between the circuit board, the Hall effect element pins, and the connector leads enable accurate processing and transmission of magnetic field signals. This design improves the sensor's integration and usability, making it more adaptable to a variety of application scenarios and providing an efficient and reliable solution for current measurement.

[0069] While the above describes specific embodiments of the present invention, the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be readily conceived by a person skilled in the art within the technical scope disclosed herein are intended to be encompassed within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

[0070] In the description of the present invention, it should be understood that the terms "upper", "lower", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. The word 'comprising' does not exclude the presence of elements or steps not listed in the claims. The word 'one' or 'an' preceding an element does not exclude the presence of multiple such elements. The simple fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used for improvement. Any reference symbols in the claims should not be interpreted as limiting the scope.

Claims

1. A magnetic core assembly comprising two symmetrically arranged magnetic cores, wherein two air gaps are formed between two opposite ends of the two magnetic cores, characterized in that: It also includes two connecting pieces and two air gap parts, the connecting piece is used for grounding, the two connecting pieces correspond to the two air gaps respectively, and are used to connect the side surfaces of the two magnetic cores, the two air gap parts are respectively arranged at the two air gaps, each of the air gap parts is provided with a groove for accommodating a Hall element and two protruding receiving parts, the two receiving parts respectively contact the top surfaces of the two magnetic cores, and are used to press the bottom surfaces of the two magnetic cores against the inner surface of the shell; wherein the top surface and the bottom surface are two opposite surfaces on the magnetic core, and the side surface is the surface on the magnetic core connecting the top surface and the bottom surface.

2. The magnetic core assembly according to claim 1, wherein: The two magnetic cores enclose a detection channel, wherein one of the two side surfaces of the magnetic core facing the detection channel is an inner side surface, and the other side surface facing away from the detection channel is an outer side surface, and the connecting piece connects the outer side surfaces.

3. The magnetic core assembly according to claim 1, wherein: The side walls of the air gap member are respectively in contact with the ends opposite to the magnetic core and the side walls of the connecting piece.

4. The magnetic core assembly according to claim 1, wherein: A reinforcement portion is provided at the connection between the receiving portion and the air gap member.

5. The magnetic core assembly according to claim 1, wherein: An air gap opening is formed on the air gap member, and the air gap opening is located on a side close to the connecting piece. The air gap member is L-shaped.

6. The magnetic core assembly according to claim 5, characterized in that The size of the air gap opening is at least one quarter of the area of ​​the air gap member.

7. The magnetic core assembly according to claim 1, wherein: The thickness of the air gap member is 2 to 10 mm.

8. The magnetic core assembly according to claim 1, wherein: One of the connecting pieces is provided with a protruding lead pin for grounding.

9. The magnetic core assembly according to claim 1, wherein: The magnetic core and the connecting piece are made of the same material, and are connected to each other by riveting.

10. An open-loop Hall current sensor, comprising a housing and a circuit board, characterized in that: It also includes the magnetic core according to any one of claims 1 to 9, wherein the magnetic core is installed in the shell, the circuit board is installed on the surface of the magnetic core, the pins of the Hall element and the lead pins on the connecting piece are electrically connected to the circuit board respectively, and a glue-filled surface is provided in the shell to encapsulate the magnetic core to form a complete open-loop Hall current sensor.

Images