Coil rack assembly for fluxgate current sensor and fluxgate current sensor

Abstract

The utility model provides a coil rack assembly for a fluxgate current sensor, which comprises a coil rack and a circuit board, one end of the coil rack is provided with a mounting seat in an extending manner, the mounting seat is provided with a circuit board fixing structure, and the circuit board is fixedly arranged on the coil rack through the circuit board fixing structure and forms an integrated structure with the coil rack. The utility model further provides a fluxgate current sensor comprising the coil rack assembly, the problems caused by relative displacement of the circuit board and the coil rack are solved, the product stability is improved, meanwhile, the defects that the coil rack and the circuit board are placed in a shell to be fixed, and the operation space is limited are avoided, and the operation efficiency is improved. And a wider space can be provided for tin soldering operation, so that the welding operation is more convenient, and the production efficiency is improved.

Description

Coil frame assembly for fluxgate current sensor and fluxgate current sensor Technical Field

[0001] This utility model belongs to the field of current sensor technology, and specifically relates to a coil frame assembly for a fluxgate current sensor and a fluxgate current sensor. Background Technology

[0002] In the field of current measurement, fluxgate current sensors are widely used in power system monitoring, industrial automation control, and new energy vehicles due to their high sensitivity and high accuracy. With the rapid development of related industries, higher demands are being placed on the performance and production efficiency of fluxgate current sensors, making product structure optimization a crucial aspect.

[0003] Currently, fluxgate current sensors on the market face numerous structural design challenges. Regarding the connection between the circuit board and the coil, some products employ relatively simple methods. A common approach is to connect the circuit board and coil assembly using pins, typically L-shaped, which pass through the circuit board and are soldered to the leads of the coil assembly to establish an electrical connection. While this design achieves basic functionality to some extent, it frequently encounters problems during actual production and use. In the soldering process, the lack of an effective positioning structure between the pins and the circuit board, relying solely on the simple pin insertion method, makes the circuit board prone to displacement if accidentally touched by the operator. This reduces product performance and reliability, increases the defect rate, and raises production costs.

[0004] In addition, while some technical solutions recognize the importance of positioning the circuit board and incorporate positioning structures within the housing to place the magnetic core assembly, pins, and circuit board inside, thus resolving the issue of relative displacement between the circuit board and pins, this design introduces new problems: during soldering operations, the housing severely obstructs the soldering space, making it difficult for operators to maneuver and perform precise soldering operations, increasing the difficulty of soldering and consequently affecting soldering quality and production efficiency. Summary of the Invention

[0005] In order to solve the above-mentioned problems in the prior art, this application provides a coil frame assembly for a fluxgate current sensor and a fluxgate current sensor to solve the above-mentioned possible technical defects.

[0006] According to a first aspect of this utility model, a coil frame assembly for a fluxgate current sensor is provided, comprising: a coil frame and a circuit board, one end of the coil frame extending to a mounting base, the mounting base being provided with a circuit board fixing structure, the circuit board being fixedly mounted on the coil frame through the circuit board fixing structure, and forming an integrated structure with the coil frame. This integrated structure helps to improve the overall stability and reliability of the assembly, reducing performance fluctuations caused by loosening or displacement of the circuit board; at the same time, during the production process, the integrated structure facilitates overall assembly and debugging, improving production efficiency.

[0007] In a specific embodiment, the mounting base is a stepped groove platform extending from one end of the coil holder. The stepped groove platform design provides a stable mounting space for the circuit board, facilitating its positioning and installation.

[0008] In a specific embodiment, the circuit board fixing structure includes multiple limiting parts for restricting the circuit board's degree of freedom in the plane of the mounting base, and the circuit board is provided with an assembly part that matches and works with the limiting parts. By matching the limiting parts with the corresponding assembly parts on the circuit board, the degree of freedom of the circuit board in the plane of the mounting base is restricted, which can effectively prevent the circuit board from sliding or rotating in the plane of the mounting base, ensuring the positional accuracy of the circuit board during soldering, use, and other processes, thereby improving the soldering quality and the stability of product performance.

[0009] In a specific embodiment, the limiting part includes a first limiting part, a second limiting part, and a third limiting part that limit from three different directions. This structure allows the circuit board to be limited from three different directions, providing a more reliable fixing effect and making the circuit board more stable on the mounting base.

[0010] In a specific embodiment, the first limiting part is disposed close to the vertical surface of the stepped groove platform, while the second and third limiting parts are disposed on both sides of the stepped groove platform. With this structural arrangement, the limiting parts respectively limit the circuit board from the vertical surface close to the stepped groove platform and from both sides of the stepped groove platform.

[0011] In a specific embodiment, the assembly portion on the circuit board consists of a first positioning groove, a second positioning groove, and a third positioning groove that respectively match and work with the first limiting portion, the second limiting portion, and the third limiting portion. In this structural arrangement, the first positioning groove, the second positioning groove, and the third positioning groove in the assembly portion on the circuit board are respectively connected to the first limiting portion, the second limiting portion, and the third limiting portion to restrict the degree of freedom of the circuit board perpendicular to the assembly direction and to restrict the flipping of the circuit board.

[0012] In a specific embodiment, the first limiting part, the second limiting part, and the third limiting part are positioning blocks protruding from the surface of the stepped groove platform. In this structural configuration, the first limiting part, the second limiting part, and the third limiting part can achieve precise positioning and degree-of-freedom control of the circuit board through geometric constraints and coordinated cooperation.

[0013] In a specific embodiment, the mounting base is also provided with multiple L-shaped pins. One end of each L-shaped pin extends vertically out of the upper surface of the mounting base, while the other end extends beyond the mounting base along its extension direction. In this configuration, the end of the L-shaped pin extending vertically out of the upper surface of the mounting base is precisely aligned with the socket on the circuit board, forming a low-impedance electrical connection through soldering; the end of the L-shaped pin extending along the extension direction of the mounting base is directly soldered to the end of the coil, establishing a signal path between the coil and the circuit board.

[0014] In a specific embodiment, the circuit board has openings corresponding to the L-shaped pins, and when the circuit board is fixed to the coil frame by a circuit board fixing structure, the L-shaped pins extend from the openings. In this structural arrangement, the L-shaped pins can reduce the space occupied during connection and improve the compactness of the layout. At the same time, the L-shaped pins work together with the limiting part and the positioning groove to achieve high-precision positioning and stable connection.

[0015] In a specific embodiment, a coil is disposed within a coil holder, the coil is wound around a magnetic core housing, and a magnetic core is disposed inside the magnetic core housing. In this structural arrangement, the magnetic core can increase the magnetic field strength and enhance the sensor's sensitivity to detecting minute currents.

[0016] In a specific embodiment, the coil includes an excitation coil and a feedback coil, both of which have two ends, and the ends of the coils are respectively connected to the other end of an L-shaped pin. In this configuration, the excitation coil and the feedback coil are used to generate and detect magnetic fields, respectively, and the ends of the coils are electrically connected to the L-shaped pin.

[0017] According to a second aspect of the present invention, a fluxgate current sensor is provided, comprising a coil frame assembly having the above-described technical features.

[0018] Compared with the prior art, the main beneficial effects of the scope disclosed in this utility model are as follows:

[0019] By setting a circuit board fixing structure on the mounting base extending from one end of the coil frame, the circuit board is fixed on the coil frame to form an integrated structure, avoiding relative displacement between the circuit board and the coil frame. At the same time, since no shell structure is used to position the circuit board, the shell does not obstruct the operation process, providing a wider space for soldering operations, making soldering operations more convenient and improving production efficiency. Attached Figure Description

[0020] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and, together with the description, serve to explain the principles of the present invention. Other embodiments and many anticipated advantages of the embodiments will be readily recognized as they become better understood through reference to the following detailed description. Elements in the drawings are not necessarily to scale. The same reference numerals refer to corresponding similar parts.

[0021] Figure 1 is a schematic diagram of the structure of a coil frame assembly according to an embodiment of the present invention;

[0022] Figure 2 is a schematic diagram of the structure of a coil frame according to an embodiment of the present invention;

[0023] Figure 3 is a schematic diagram of the structure of a coil according to an embodiment of the present invention;

[0024] Figure 4 is a schematic diagram of the circuit board according to an embodiment of the present invention;

[0025] Figure 5 is a schematic diagram of the structure of a current sensor according to another embodiment of the present invention.

[0026] The meanings of the reference numerals in the figure are as follows: 01-coil frame, 02-coil assembly, 03-feedback coil, 04-excitation coil, 05-bottom shell, 06-top cover, 07-positioning post, 08-buckle, 09-first limiting part, 10-second limiting part, 11-third limiting part, 12-stepped groove platform, 13-L-shaped pin, 14-groove, 15-circuit board, 16-first positioning groove, 17-second positioning groove, 18-third positioning groove, 19-opening, 20-magnetic core protective shell, 21-opening, 22-mounting base, 23-circuit board fixing structure, 24-assembly part. Detailed Implementation

[0027] In the following detailed description, reference is made to the accompanying drawings, which form part of the detailed description and illustrate illustrative specific embodiments in which the present invention may be practiced. In this regard, directional terms such as “top,” “bottom,” “left,” “right,” “up,” “down,” etc., are used with reference to the orientation of the described figures. Because components of the embodiments can be positioned in several different orientations, directional terms are used for illustrative purposes and are by no means limiting. It should be understood that other embodiments may be utilized or logical changes may be made without departing from the scope of the present invention. Therefore, the following detailed description should not be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.

[0028] This invention provides a coil frame assembly for a fluxgate current sensor in its first aspect. Figure 1 shows a schematic diagram of the coil frame assembly according to an embodiment of this invention. As shown in Figure 1, the coil frame assembly includes a coil frame 01 and a circuit board 15. A coil assembly 02 is fixedly mounted on the coil frame 01. One end of the coil frame 01 extends to a mounting base 22, on which a circuit board fixing structure 23 is provided. The circuit board 15 is fixedly mounted on the coil frame 01 through the circuit board fixing structure 23, forming an integrated structure with the coil frame 01. This integrated structure helps improve the overall stability and reliability of the assembly, reducing performance fluctuations caused by loosening or displacement of the circuit board 15. Simultaneously, during production, the integrated structure facilitates overall assembly and debugging, improving production efficiency.

[0029] In a specific embodiment, the circuit board fixing structure 23 may include multiple limiting parts for restricting the planar degrees of freedom of the circuit board 15 on the mounting base 22, and the circuit board 15 is provided with an assembly part 24 that matches and works with the limiting parts. By cooperating with the corresponding assembly part 24 on the circuit board 15, the degree of freedom of the circuit board 15 in the plane of the mounting base 22 is restricted, which can effectively prevent the circuit board 15 from sliding or rotating in the plane of the mounting base 22, ensuring the positional accuracy of the circuit board 15 during welding, use, etc., thereby improving the welding quality and product performance stability. It should be understood that restricting the planar degrees of freedom is equivalent to restricting the relative displacement between the circuit board 15 and the mounting base 22 on the surfaces that are in contact with each other, thereby making the two fixedly connected to each other. The multiple parts should refer to two or more. It is understood that, under certain circumstances, two limiting parts can also achieve the above functions or technical effects.

[0030] In one specific embodiment, the mounting base 22 is further provided with a plurality of L-shaped pins 13, and the circuit board 15 is provided with openings 19 corresponding to the L-shaped pins 13. When the circuit board 15 is fixedly mounted on the coil frame 01 by the circuit board fixing structure 23, the L-shaped pins 13 extend out from the openings 19. This structure can restrict the degree of freedom of the circuit board 15 perpendicular to the assembly direction and also prevent the circuit board 15 from flipping. Therefore, during the soldering process of the L-shaped pins 13 and the circuit board 15, even if the circuit board 15 is touched, there will be no relative displacement between the circuit board 15 and the coil frame 01, thereby avoiding bending of the L-shaped pins 13.

[0031] Figure 2 shows a schematic diagram of the coil frame structure according to an embodiment of the present invention. As shown in Figure 2, a stepped groove platform 12 extends from one end of the coil frame 01. Three limiting parts in different orientations are provided above the stepped groove platform 12: a first limiting part 09, a second limiting part 10, and a third limiting part 11. The first limiting part 09, the second limiting part 10, and the third limiting part 11 are all positioning blocks protruding from the surface of the stepped groove platform 12. The first limiting part 09 is positioned close to the vertical plane of the stepped groove platform 12, the second limiting part 10 is positioned on the left side of the stepped groove platform 12, and the third limiting part 11 is symmetrically positioned on the right side of the stepped groove platform 12. With this structural arrangement, the limiting parts limit the circuit board 15 from the vertical plane close to the stepped groove platform 12 and from both sides of the stepped groove platform 12, respectively. It is understood that, under certain circumstances, two limiting parts can also achieve a similar function. The stepped slot platform 12 is also provided with multiple L-shaped pins 13. One end of the L-shaped pin 13 extends vertically out of the upper surface of the stepped slot platform 12, and the other end extends out of the stepped slot platform 12 along its extension direction. In this structural arrangement, the end of the L-shaped pin 13 extending vertically out of the upper surface of the stepped slot platform 12 is precisely aligned with the socket on the circuit board 15, and a low-impedance electrical connection is formed by soldering; the end of the L-shaped pin 13 extending along the extension direction of the stepped slot platform 12 is directly soldered to the end of the coil, establishing a signal path between the coil 2 and the circuit board 15.

[0032] In a specific embodiment, the positioning block shape structure of the three limiting parts restricts the assembly direction of the circuit board 15 to be assembled only in a direction perpendicular to the circuit board 15 and the coil frame 01; and the reasonable distribution of the three limiting parts can effectively position and fix the circuit board 15, prevent the circuit board 15 from rotating or flipping, and also facilitate the rapid positioning and assembly of the circuit board 15.

[0033] In a specific embodiment, a groove 14 is provided below the stepped groove platform 12, and one end of the L-shaped pin 13 protrudes from the groove 14 along the extending direction of the stepped groove platform 12. This structural design prevents the L-shaped pin 13 from becoming loose or shifting in the stepped groove platform 12, which helps to improve the stability of the coil frame assembly structure.

[0034] In a specific embodiment, the first limiting part 09, the second limiting part 10, and the third limiting part 11 are rectangular positioning block structures. In a specific example, the coil frame 01 and the positioning block can be injection molded in one step using a precision mold through an integrated injection molding process, thereby reducing costs. The reasonable distribution of the three limiting parts can more effectively position and fix the circuit board 15, enhancing the limiting effect.

[0035] In a specific embodiment, the L-shaped pin 13 and the stepped groove platform 12 are integrally molded through injection molding. Injection molding also ensures that the distance between adjacent L-shaped pins 13 remains consistent, eliminating errors from manual assembly, improving structural strength, and making it suitable for mass production.

[0036] Figure 3 shows a schematic diagram of the coil structure according to an embodiment of the present invention. As shown in Figure 3, the coil assembly 02 includes two coils, namely an excitation coil 04 and a feedback coil 03. Both the excitation coil 04 and the feedback coil 03 are wound on a magnetic core housing 20, which contains a magnetic core. In this structural arrangement, the excitation coil 04 and the feedback coil 03 are used to generate and detect magnetic fields, respectively, and the magnetic core can increase the magnetic field strength, thereby enhancing the sensor's sensitivity to detecting minute currents.

[0037] In a specific embodiment, the excitation coil 04 and the feedback coil 03 each have two ends. A total of four L-shaped pins 13 are provided on the stepped groove platform 12. One end of the four L-shaped pins 13 extending outward along the stepped groove platform 12 is respectively connected to the ends of the excitation coil 04 and the feedback coil 03 by soldering, so as to realize the electrical connection between the L-shaped pins 13 and the excitation coil 04 and the feedback coil 03.

[0038] Referring again to Figure 4, which shows a schematic diagram of a circuit board according to an embodiment of the present invention. As shown in Figure 4, the assembly portion 24 of the circuit board 15 includes a first positioning groove 16, a second positioning groove 17, and a third positioning groove 18. The first positioning groove 16 is located on the front front side of the circuit board 15 and works in conjunction with the first limiting portion 09 on the coil holder 01; the second positioning groove 17 is located on the left front side of the circuit board 15 and works in conjunction with the second limiting portion 10 on the coil holder 01; the third positioning groove 18 is located on the right front side of the circuit board 15 and works in conjunction with the third limiting portion 11 on the coil holder 01. Four equally spaced openings 19 are located at the center of the front end of the circuit board 15, corresponding to the four L-shaped pins 13 on the coil holder 01. This structural arrangement restricts the degree of freedom of the circuit board 15 perpendicular to the assembly direction and restricts the flipping of the circuit board 15; simultaneously, by providing openings 19 corresponding to the L-shaped pins 13, the space occupied during connection can be reduced, improving the compactness of the layout.

[0039] In the embodiment shown in Figure 4, the mounting portion 24 of the circuit board 15 is a groove, while the limiting portion on the coil holder 01 is a snap-fit ​​block. It should be understood that, where possible, the two can also be fixed in the opposite way, for example, by providing a positioning groove on the coil holder 01 and a snap-fit ​​block on the circuit board 15. This situation also conforms to the inventive concept of this utility model and falls within the scope of protection.

[0040] Figure 5 shows a schematic diagram of a current sensor according to another embodiment of the present invention. The current sensor contains a coil frame assembly as shown in Figure 1. As shown in Figure 5, the current sensor also includes a bottom shell 05 and a top cover 06. The coil frame assembly is disposed within the bottom shell 05 and sealed by the top cover 06. The top cover 06 is fixed to the bottom shell 05 by multiple snap fasteners 08, and multiple positioning posts 07 are provided around the perimeter for auxiliary positioning. In a specific example, five snap fasteners 08 are respectively disposed on the front and left / right sides of the coil frame 01, and on the left / right sides of the circuit board 15; four positioning posts 07 are respectively disposed on the front two sides of the coil frame 01, and on the left / right sides of the connection between the coil frame 01 and the circuit board 15. This structural design improves the structural stability of the current sensor device.

[0041] Obviously, those skilled in the art can make various modifications and changes to the embodiments of this utility model without departing from the spirit and scope of this utility model. In this way, this utility model is also intended to cover such modifications and changes if they fall within the scope of the claims of this utility model and their equivalents. The word "comprising" does not exclude the presence of other elements or steps not listed in the claims. The simple fact that certain measures are described in mutually different dependent claims does not indicate that a combination of these measures cannot be used for profit. Any reference numerals in the claims should not be considered as limiting the scope.

Claims

1. A coil frame assembly for a fluxgate current sensor, characterized in that, include: The coil frame and the circuit board are provided. One end of the coil frame extends to be provided with a mounting base. The mounting base is provided with a circuit board fixing structure. The circuit board is fixedly mounted on the coil frame through the circuit board fixing structure and forms an integrated structure with the coil frame.

2. The coil frame assembly for a fluxgate current sensor according to claim 1, characterized in that, The mounting base is a stepped groove platform extending from one end of the coil frame.

3. A coil frame assembly for a fluxgate current sensor according to claim 2, characterized in that, The circuit board fixing structure includes multiple limiting parts for restricting the planar degree of freedom of the circuit board on the mounting base, and the circuit board is provided with an assembly part that matches and works with the limiting parts.

4. A coil frame assembly for a fluxgate current sensor according to claim 3, characterized in that, The limiting part includes a first limiting part, a second limiting part, and a third limiting part that limit from three different directions.

5. A coil frame assembly for a fluxgate current sensor according to claim 4, characterized in that, The first limiting part is disposed close to the vertical surface of the stepped groove platform, and the second limiting part and the third limiting part are respectively disposed on both sides of the stepped groove platform.

6. A coil frame assembly for a fluxgate current sensor according to claim 4 or 5, characterized in that, The assembly portion on the circuit board consists of a first positioning groove, a second positioning groove, and a third positioning groove that respectively match and work with the first limiting portion, the second limiting portion, and the third limiting portion.

7. A coil frame assembly for a fluxgate current sensor according to claim 4 or 5, characterized in that, The first limiting part, the second limiting part, and the third limiting part are positioning blocks that protrude from the surface of the stepped groove platform.

8. A coil frame assembly for a fluxgate current sensor according to claim 1, characterized in that, The mounting base is also provided with a plurality of L-shaped pins, one end of which extends vertically out of the upper surface of the mounting base, and the other end extends out of the mounting base along the extension direction of the mounting base.

9. A coil frame assembly for a fluxgate current sensor according to claim 8, characterized in that, The circuit board has an opening that matches the L-shaped pin, and when the circuit board is fixedly mounted on the coil frame by the circuit board fixing structure, the L-shaped pin extends out from the opening.

10. A coil frame assembly for a fluxgate current sensor according to claim 8, characterized in that, A coil is provided in the coil frame, the coil is wound on the magnetic core sheath, and a magnetic core is provided inside the magnetic core sheath.

11. A coil frame assembly for a fluxgate current sensor according to claim 10, characterized in that, The coil includes an excitation coil and a feedback coil. Both the excitation coil and the feedback coil have two ends, and the ends of the coil are respectively connected to the other end of the L-shaped pin.

12. A fluxgate current sensor, characterized in that, Includes the coil frame assembly as described in any one of claims 1-11.

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