Magnetic device and electronic apparatus

Abstract

The application relates to the technical field of magnetic devices, and discloses a magnetic device and an electronic device. The magnetic device comprises a magnetic core, the magnetic core comprises columnar bodies arranged at intervals, end plates respectively arranged at two ends of the columnar bodies, and functional platforms arranged on the end plates, the functional platforms are arranged in a center-symmetrical stepped structure relative to the end plates; windings are arranged around each columnar body, and the windings have lead wires led out from end portions; terminals are arranged on the functional platforms and correspond to the end portions of each columnar body, one side of the terminal is provided with a covering ear for fixing and covering the lead wire, the covering ear and the lead wire are located at an outer stepped surface of the functional platform, and a functional groove is arranged below an end of the lead wire on a side of the outer stepped surface of the functional platform away from the columnar body. The application optimizes the spatial layout of the magnetic device and improves the reliability of the magnetic device.

Description

Technical Field

[0001] This application relates to the field of magnetic device technology, specifically to a magnetic device and electronic device. Background Technology

[0002] In the manufacturing process of magnetic devices, taking common-mode inductors as an example, as key electromagnetic interference suppression components in electronic circuits, they typically include electrode terminals, a magnetic core, and windings wound on the magnetic core. The winding leads and terminals are fixed and connected through a welding process. However, in related technologies, when laser welding the windings and terminals, the laser energy in the welding area can easily act directly on the magnetic core, causing the magnet to break or crack due to instantaneous high temperature, affecting the performance and reliability of the device. Furthermore, after laser welding the windings and terminals, the solder joints often protrude and extend beyond the outline of the magnetic core. This not only directly increases the overall package size of the product, which is not conducive to the miniaturization and high-density layout of the equipment, but also makes the protruding solder joints susceptible to damage due to friction and collision during subsequent assembly or use, affecting the long-term reliability of the electrical connection. Utility Model Content

[0003] In view of this, this application provides a magnetic device and an electronic device to solve the aforementioned technical problems.

[0004] In a first aspect, embodiments of this application disclose a magnetic device, comprising: The magnetic core includes spaced-apart central columns and end plates respectively disposed at both ends of the central columns. The end plates are provided with functional platforms, which are arranged in a stepped structure symmetrical with respect to the center of the end plates. A winding, wherein the winding is wound on each of the central columns, and the ends of the winding are led out; The terminal is disposed on the functional platform and corresponds to the end of each of the central columns. One side of the terminal is provided with a lug for fixing and covering the lead wire. The lug and the lead wire are located on the outer stepped surface of the functional platform. On the side of the outer stepped surface of the functional platform away from the central column, there is a functional groove located below the end of the lead wire.

[0005] In one possible example, the functional platform includes a central step and edge steps on both sides of the central step. The edge steps are connected to the side of the end plate, and the lug and the lead wire are located on the edge steps. The edge steps have the functional groove located below the end of the lead wire on the side opposite to the central column.

[0006] In one possible example, a cover plate is also included, which is connected to the functional platform and covers the magnetic core and windings.

[0007] In one possible example, the functional platform further includes a middle step integrally connected between the central step and the edge step, and the terminal is disposed on the middle step.

[0008] In one possible example, the terminal is arranged in a C-shape, with one end connected to the top of the intermediate step and the other end connected to the side of the end plate opposite to the functional platform.

[0009] In one possible example, the top of the intermediate step is provided with a mounting groove, and one end of the terminal is provided with a mounting post that matches the mounting groove.

[0010] In one possible example, the central step, the intermediate step, and the edge step are arranged in a stepped surface structure on the side away from the central column.

[0011] In one possible example, the side of the terminal facing away from the intermediate step is parallel to the side of the central step facing away from the central column.

[0012] In one possible example, an arcuate portion is provided on the side of the end plate facing each other and between adjacent central posts, the arcuate portion being recessed toward the side of the end plate opposite to the central posts.

[0013] Secondly, embodiments of this application disclose an electronic device including the magnetic device described in any of the above embodiments.

[0014] In summary, compared with the prior art, this application discloses a magnetic device and an electronic device. The magnetic device includes a magnetic core, windings, and terminals. The magnetic core includes spaced-apart central pillars and end plates respectively disposed at both ends of the central pillars. The end plates are provided with functional platforms, which are arranged in a stepped structure symmetrical to the center of the end plates. The windings are wound on each central pillar, and the ends of the windings are led out. The terminals are disposed on the functional platforms and correspond to the ends of each central pillar. One side of the terminal is provided with a lug for fixing and covering the lead wire. The lug and the lead wire are located on the outer stepped surface of the functional platform. On the side of the outer stepped surface of the functional platform away from the central pillars, there is a functional slot located below the end of the lead wire. That is, through the above arrangement, the spatial layout of the magnetic device is optimized and its reliability is improved. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the magnetic device of this application; Figure 2 This is a schematic diagram of the magnetic device of the hidden cover plate in this application; Figure 3 This is a schematic diagram of the magnetic core structure of this application; Figure 4 This is a schematic diagram of the terminal structure of this application.

[0017] Figure descriptions: 1. Magnetic core; 11. Center post; 12. End plate; 2. Winding; 21. Lead wire; 3. Terminal; 31. Wrap ear; 32. Mounting post; 4. Functional platform; 41. Center step; 42. Edge step; 43. Middle step; 51. Functional slot; 52. Mounting slot; 53. Arc-shaped part; 6. Cover plate. Detailed Implementation

[0018] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the claims.

[0019] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, components, features, and elements with the same names in different embodiments of this application may have the same meaning or different meanings, the specific meaning of which must be determined by its interpretation in that specific embodiment or further in conjunction with the context of that specific embodiment.

[0020] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0021] In the following description, the use of suffixes such as "module," "part," or "unit" to denote elements is solely for the purpose of illustrative purposes and has no specific meaning in itself. Therefore, "module," "part," or "unit" may be used interchangeably.

[0022] In the description of this application, it should be noted that the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] The technical solutions shown in this application will be described in detail below through specific embodiments. It should be noted that the order of description of the following embodiments is not intended to limit the priority of the embodiments.

[0024] Please refer to Figures 1 to 3 The magnetic device in this application embodiment includes a magnetic core 1, a winding 2, and a terminal 3.

[0025] In the specific implementation process, the magnetic core 1 includes spaced-apart central columns 11 and end plates 12 respectively located at both ends of the central columns 11. The end plates 12 are provided with functional platforms 4, which are arranged in a stepped structure that is symmetrical about the center of the end plates 12. The windings 2 are wound on each central column 11, and the ends of the windings 2 are led out with leads 21 for electrical connection. The terminals 3 are located on the functional platforms 4 and correspond to the ends of each central column 11, and are used to receive the leads 21 of the windings 2 on each central column 11.

[0026] One side of terminal 3 is provided with a lug 31 for fixing and covering lead 21. The lug 31 and lead 21 are located on the outer stepped surface of the functional platform 4. On the side of the outer stepped surface of the functional platform 4 away from the central column 11, there is a functional groove 51 located below the end of lead 21. Thus, the lug 31 and lead 21 can be accommodated and hidden by the outer stepped surface, and the solder joint 21a formed by the electrical connection of lug 31 and lead 21 can be accommodated by the functional groove 51, so that the solder joint 21a does not exceed the side contour of end plate 12. This effectively optimizes the internal space layout, avoids increasing the overall size of the device due to the protrusion of the welding structure, avoids the complexity of device packaging, saves the mold cost of packaging and the overall product manufacturing cost, and improves the reliability and consistency of the welding connection.

[0027] In one example, the magnetic core 1 constructed by the end plate 12 and the spaced-apart center posts 11 forms a square ring-shaped closed magnetic circuit structure. The spaced-apart center post 11 structure provides the magnetic circuit basis for common-mode inductors to achieve their core function of suppressing common-mode noise. The windings 2 are wound on different center posts 11 to form the coupling function required by the common-mode inductor. The functional platform 4 is preferably a stepped structure protruding from the end face of the end plate 12, and its stepped surface is symmetrically distributed with respect to the center of the end plate 12 so that it corresponds to each center post 11 and carries each terminal 3.

[0028] In this embodiment, the winding 2 can be made of copper enameled wire. The winding 2 consists of at least one enameled wire. It is understood that metallic copper is an excellent conductive material with low resistance. Using copper enameled wire as the winding 2 can reduce the resistance of the inductor and improve the current transmission efficiency. In addition, copper has good thermal conductivity, which can effectively conduct heat away from the winding 2, avoiding the degradation or damage of inductor performance due to excessive temperature. On the other hand, copper enameled wire can usually withstand high temperatures and is suitable for applications in high-temperature environments. This is very important for magnetic devices that need to operate under high-temperature conditions. Furthermore, copper enameled wire has high corrosion resistance and can resist the erosion of some chemical substances, thereby extending the service life of magnetic devices.

[0029] Preferably, in this embodiment of the application, a reliable electrical and mechanical connection between the terminal 3 and the lead 21 is achieved by laser welding. At least part of the lug 31 melts into the lead 21 during welding to form a solder joint 21a housed on the outer stepped surface of the functional platform 4. That is, the outer stepped surface of the functional platform 4 and the functional groove 51 can provide a preset area for the solder joint 21a to accommodate and shrink, effectively guiding and controlling the final shape of the solder, thereby ensuring that the formed solder joint 21a is full and firm, and its overall outline does not exceed the side of the end plate 12. This optimizes the spatial layout of the magnetic device, so that the device can obtain excellent connection performance while strictly limiting its maximum size on the end plate side, providing a key guarantee for realizing the miniaturization and high-density installation of the device.

[0030] Meanwhile, the design of the functional slot 51 physically removes the magnetic material below the solder joint 21a of the lead wire 21 and the lug 31, ensuring that during laser welding, the high-energy laser beam and the area directly below the solder joint 21a are in a suspended state without magnets. This fundamentally avoids the risk of the laser energy being instantly absorbed by the magnetic core 1, which could lead to local overheating, damage, or micro-cracks in the magnet, and greatly improves the welding yield and long-term reliability of the device.

[0031] Preferably, the size range of the functional slot 51 from the central column 11 toward the end plate 12 is 0.1~2mm. This size range provides effective clearance space for the laser beam during laser welding, preventing the laser from directly hitting and damaging the core 1 body material, thereby ensuring the stability of the welding process and the integrity of the core. In addition, this depth can accommodate the weld point 21a formed by welding, ensuring that it is confined within the functional slot 51 and does not exceed the outermost contour boundary of the end plate 12. This strictly achieves the miniaturization design goal of the product and avoids additional device packaging size or complexity due to weld point protrusion.

[0032] In one example, the functional platform 4 includes a central step 41 and edge steps 42 on both sides of the central step 41. The edge steps 42 are connected to the side of the end plate 12, and the lug 31 and the lead wire 21 are located on the edge steps 42. The side of the edge steps 42 away from the central column 11 is provided with a functional groove 51 located below the end of the lead wire 21.

[0033] The central step 41 is located at the center of the end plate 12 (between adjacent central columns 11), and the edge steps 42 are symmetrically arranged on both sides of the central step 41, forming a stepped structure that is symmetrical about the center of the end plate 12. In this structure, the lugs 31 of the terminal 3 and the lead wires 21 they are fixedly covered are both located on the upper surface of the edge steps 42. On each edge step 42, a functional groove 51 is opened at its outer edge away from the central column 11. The position of the functional groove 51 corresponds to the end of the lead wire 21 placed in the lug 31, thereby clarifying the functional area of ​​the functional platform 4. The edge steps 42 on both sides are used to support electrical connection components (the lugs 31 of the terminal 3 and the lead wires 21) and provide space for solder joints, ensuring that the solder joints 21a are confined within the outline of the end plate 12, thereby minimizing the overall size of the device and achieving high reliability of the soldering process.

[0034] Understandably, the central step 41 protrudes relative to the edge step 42 so that the edge step 42 can accommodate the lug 31 and the lead wire 21.

[0035] The magnetic device also includes a cover plate 6, which is made of insulating material. The cover plate 6 is connected to the functional platform 4 and covers the magnetic core 1 and winding 2 to provide protection.

[0036] Preferably, the cover plate 6 is connected to the top of the central step 41 to provide protection without structurally interfering with the lug 31 and the lead wire 21. That is, the size and outline of the cover plate 6 are configured to completely cover the magnetic core 1 below (including its end plate 12 and central post 11) and the winding 2 wound on the central post 11, thereby providing physical protection and insulation for the internal magnetic components and coils.

[0037] Importantly, the installation position of the cover plate 6 (i.e., the top of the central step 41) completely avoids the electrical connection structures (ears 31 and leads 21) located on the side edge steps 42. This layout ensures that no mechanical interference or stress will be caused to the existing electrical connections during the installation of the cover plate 6 and its subsequent use, while also providing protection.

[0038] Preferably, the cover plate 6 is fixedly connected to the top of the central step 41 by an adhesive layer.

[0039] In one example, the functional panel 4 also includes a middle step 43, which is integrally connected between the central step 41 and the edge step 42, and the terminal 3 is disposed on the middle step 43.

[0040] The functional platform 4 includes a central step 41, a middle step 43, and an edge step 42. In other words, from the side of the end plate 12 toward the center, the height of the steps is successively the edge step 42, the middle step 43, and the central step 41, thus forming a multi-level stepped platform structure. Of course, the number of middle steps 43 can be set to multiple according to environmental requirements to form a more multi-level stepped platform structure to match the functional settings of the device. That is, the number of steps n of the functional platform 4 is greater than or equal to 2, which will not be elaborated here.

[0041] Based on the intermediate step 43, the terminal 3 is set on the intermediate step 43, and the ear 31 on one side of the terminal 3 falls into the edge step 42 area to receive and fix the lead wire 21. That is, by introducing the intermediate step 43, a dedicated and moderately high mounting plane is provided for the terminal 3. This not only ensures the stability and positioning accuracy of the terminal 3 installation, but also optimizes the spatial layout relationship between the terminal 3, the lead wire 21, the welding area (functional slot 51) and the cover plate 6 through clear hierarchical differentiation, making the structure more compact and the functional zoning clearer, which is conducive to improving assembly efficiency and structural reliability.

[0042] Preferably, terminal 3 is fixedly connected to intermediate step 43 by adhesive layer.

[0043] Optionally, terminal 3 is arranged in a C-shape, with one end of terminal 3 connected to the top of the middle step 43 and the other end of terminal 3 connected to the side of end plate 12 away from function platform 4. Thus, terminal 3 can be fastened to the outer wall of end plate 12 and function platform 4. This C-shaped cross structure design allows terminal 3 to act like a clamp, starting from the middle step 43 of function platform 4 and wrapping around part of the edge of end plate 12. It not only utilizes the step plane of function platform 4 for positioning, but also forms a two-point fixation by gripping end plate 12, which greatly enhances the adhesion of terminal 3 to magnetic core 1 and its ability to resist vibration and shear stress, thereby improving the long-term reliability of electrical connection. In addition, the exposed part of terminal 3 can also be used as an external pin of magnetic device, which can be directly soldered or plugged into external circuit (such as printed circuit board) to realize the electrical interconnection function of device.

[0044] In one example, to achieve a more precise and secure mechanical connection between terminal 3 and magnetic core 1, a mounting groove 52 is provided at the top of the intermediate step 43, and a mounting post 32 matching the mounting groove 52 is provided at one end of terminal 3. That is, a downwardly protruding mounting post 32 is integrally formed facing the mounting groove 52. During assembly, the mounting post 32 of terminal 3 is aligned and embedded into the mounting groove 52 on the intermediate step 43 of magnetic core 1, thereby forming a reliable mechanical interlocking structure. This "groove-post" mating structure provides a clear installation positioning reference, which greatly improves the accuracy and efficiency of assembly, and is especially suitable for automated production. Moreover, the combination of mechanical interlocking and adhesive layer can significantly enhance the holding force of terminal 3 under harsh working conditions such as vibration and impact, and effectively prevent terminal displacement or detachment.

[0045] It should be noted that, from the outermost edge step 42 to the innermost center step 41, these steps are distributed in a stepped manner with a gradual increase. The height difference between the edge step 42, the middle step 43, and the center step 41 in the direction protruding from the end plate 12 ranges from 0.1 to 2 mm. This provides the necessary and differentiated installation and operation space for the components carried on different steps. In particular, it ensures that the edge step 42 area has sufficient space to accommodate the welding process. The precisely controlled height difference achieves functional zoning while maintaining the compactness of the structure to the greatest extent and avoiding unnecessary volume increase.

[0046] Preferably, the central step 41, the middle step 43, and the edge step 42 are arranged in a stepped surface structure on the side away from the central column 11. In other words, when viewed from the direction perpendicular to the end plate 12, the outer side of each step is successively recessed, forming a stepped outline, which helps to achieve a compact spatial layout and clear functional zoning.

[0047] The installation position and direction of terminal 3 are also adapted to this stepped structure. That is, the side of terminal 3 away from the middle step 43 is parallel to the side of the central step 41 away from the central column 11. This parallel design allows the outline of terminal 3 to be coordinated with the overall stepped outline of the functional platform 4. This makes the arrangement of terminal 3 more regular, which is conducive to optimizing the space utilization of the end area of ​​magnetic core 1, maintaining the flatness and sense of order of the outward structure of the device, facilitating subsequent assembly or potting processes, and providing stable and consistent support and positioning reference for terminal 3. This reflects the unity of integrity and functionality in the structural design.

[0048] In one example, an arc-shaped portion 53 is provided on the side of the end plate 12 facing each other and located between adjacent central posts 11. The arc-shaped portion 53 is recessed towards the side of the end plate 12 away from the central posts 11, thereby forming a smooth arc-shaped transition area on the inner edge of the end plate 12. This arc-shaped portion 53 provides greater movement and clearance space for the needle (or flying hook) of the winding equipment during the winding of the winding 2. This effectively avoids the risk of collision between the needle and the sharp corner of the magnetic core 1 during high-speed winding, which not only reduces the possibility of chipping or breakage of the magnetic core 1, but also reduces the damage to the insulation layer on the wire surface caused by friction. Therefore, this structure significantly improves the yield and efficiency of the winding process, enhances the reliability of the product, and reduces production costs.

[0049] Optionally, the recess size of the arc-shaped portion 53 on the side of the end plate 12 away from the center post 11 is in the range of 0.1~2mm. In this embodiment, the recess size can refer to the key dimensions of the depth or radius of curvature of the arc-shaped recess. By providing a smooth arc transition within this specific range, a more ample and safer lateral range of motion is created for the needle of the winding device on the key winding path between adjacent center posts 11.

[0050] It is understood that in this embodiment, the magnetic core 1 is made of magnetic material, which may include one or more of ferrite material, magnetic metal alloy material, iron-silicon alloy material or soft magnetic material to meet the working requirements of magnetic device.

[0051] This application also discloses an electronic device, including a magnetic device as described in any of the above embodiments. For other working principles and processes of the electronic device in this embodiment, please refer to the description of the magnetic device in the foregoing embodiments, which will not be repeated here.

[0052] The magnetic devices and electronic devices provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. It should be noted that the descriptions of each embodiment in this application have different emphases. Parts not described in detail or in a certain embodiment can be referred to the relevant descriptions of other embodiments.

[0053] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. The technical features of the technical solution of this application can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are also included within the patent protection scope of this application, as long as the combination of these technical features does not contradict each other.

[0054] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only for the purpose of helping to understand the core ideas of the present application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present application. Therefore, the content of this specification should not be construed as a limitation of the present application.

Claims

1. A magnetic device, characterized in that, include: The magnetic core (1) includes spaced central columns (11) and end plates (12) respectively disposed at both ends of the central columns (11). The end plates (12) are provided with functional platforms (4), which are arranged in a stepped structure symmetrical to the center of the end plates (12). The winding (2) is wound on each of the central columns (11), and the ends of the winding (2) are led out with leads (21). Terminal (3), the terminal (3) is provided on the functional platform (4) and corresponds to the end of each of the central columns (11). One side of the terminal (3) is provided with a lug (31) for fixing and covering the lead wire (21). The lug (31) and the lead wire (21) are located on the outer stepped surface of the functional platform (4). On the side of the outer stepped surface of the functional platform (4) away from the central column (11), there is a functional groove (51) located below the end of the lead wire (21).

2. The magnetic device as described in claim 1, characterized in that, The functional platform (4) includes a central step (41) and edge steps (42) on both sides of the central step (41). The edge steps (42) are connected to the side of the end plate (12). The ear (31) and the lead wire (21) are located on the edge steps (42). The edge steps (42) on the side away from the central column (11) are provided with the functional groove (51) located below the end of the lead wire (21).

3. The magnetic device as described in claim 1, characterized in that, It also includes a cover plate (6) which is connected to the functional platform (4) and covers the magnetic core (1) and winding (2).

4. The magnetic device as described in claim 2, characterized in that, The functional platform (4) also includes an intermediate step (43), which is integrally connected between the central step (41) and the edge step (42), and the terminal (3) is disposed on the intermediate step (43).

5. The magnetic device as described in claim 4, characterized in that, The terminal (3) is arranged in a C-shape. One end of the terminal (3) is connected to the top of the intermediate step (43), and the other end of the terminal (3) is connected to the side of the end plate (12) away from the functional platform (4).

6. The magnetic device as described in claim 5, characterized in that, The top of the intermediate step (43) is provided with a mounting groove (52), and one end of the terminal (3) is provided with a mounting post (32) that matches the mounting groove (52).

7. The magnetic device as described in claim 4, characterized in that, The central step (41), the middle step (43) and the edge step (42) are arranged in a stepped surface structure on the side away from the central column (11).

8. The magnetic device as described in claim 7, characterized in that, The side of the terminal (3) facing away from the intermediate step (43) is parallel to the side of the central step (41) facing away from the central column (11).

9. The magnetic device according to any one of claims 1 to 8, characterized in that, An arc-shaped portion (53) is provided on the side of the end plate (12) facing each other and between the adjacent central columns (11), the arc-shaped portion (53) being recessed on the side of the end plate (12) away from the central columns (11).

10. An electronic device, characterized in that, Includes the magnetic device as described in any one of claims 1 to 9.

Images