Magnetic element and switching power supply

Abstract

The utility model provides a magnetic element and a switching power supply, the magnetic element comprises a shell, at least one magnetic piece and a heat-conducting glue layer, and the shell is provided with an opening; the magnetic part is arranged in the shell, the magnetic part comprises a magnetic core, at least one coil and a flexible insulating layer, the coil is arranged in the magnetic core, the flexible insulating layer is arranged between the coil and the magnetic core, and the gap between the magnetic core and the shell and the gap between any two of the magnetic core, the coil and the flexible insulating layer are filled with the heat-conducting glue layer. According to the embodiment of the invention, the flexible insulating layer is arranged between the coil and the magnetic core, and the flexible insulating layer can absorb the stress on the magnetic core of the magnetic element generated by the thermal expansion of the heat-conducting glue layer through deformation, so that the normal function of the magnetic element is ensured.

Description

Technical Field

[0001] This application relates to electronic component manufacturing technology, and more particularly to a magnetic component and a switching power supply. Background Technology

[0002] A switching power supply is a power device that converts electrical energy using high-frequency switching devices. Its working principle involves controlling the on and off time ratio of the switching devices and filtering the output to maintain a stable output voltage. With the development of switching power supply technology, the power density of magnetic components in switching power supplies is constantly increasing while their size is decreasing. Therefore, heat dissipation has become a pressing issue.

[0003] In the related technical solutions, the magnetic components of the switching power supply include a metal casing and a magnetic component. The magnetic component is insulated and installed inside the metal casing. The heat of the magnetic component can be guided to the metal casing by pouring thermally conductive adhesive, thereby solving the heat dissipation problem of the magnetic component.

[0004] However, due to the large coefficient of thermal expansion of thermally conductive adhesive, the thermally conductive adhesive may crack the magnetic core of the magnetic component after being heated and expanded, thus affecting the normal function of the magnetic component. Utility Model Content

[0005] In order to overcome the above-mentioned defects in related technologies, the purpose of this application is to provide a magnetic component and a switching power supply. This application can reduce the probability that the magnetic core of the magnetic component will crack after the thermally conductive adhesive expands due to heat, thus ensuring the normal function of the magnetic component.

[0006] On one hand, this application provides a magnetic element, comprising:

[0007] The outer casing has an opening;

[0008] At least one magnetic component is disposed within the housing. The magnetic component includes a magnetic core, at least one coil, and a flexible insulating layer. The coil is disposed on the magnetic core, and the flexible insulating layer is disposed between the coil and the magnetic core.

[0009] A thermally conductive adhesive layer is provided, which fills the gap between the magnetic core and the outer shell, as well as between any two of the magnetic core, the coil, and the flexible insulating layer.

[0010] In one possible implementation, the area of ​​the flexible insulating layer is greater than or equal to one-third of the projected area of ​​the coil on the magnetic core.

[0011] In one possible implementation, the magnetic core includes a first end face, a second end face, at least one central post, a first side post, and a second side post disposed opposite to each other, with the two ends of the central post, the first side post, and the second side post respectively connected to the first end face and the second end face, and the coil is sleeved on the central post;

[0012] The flexible insulating layer is disposed between the coil and the first side post and / or the coil and the second side post;

[0013] And / or, the flexible insulating layer is disposed between the coil and the central column;

[0014] And / or, the flexible insulating layer is disposed between the coil and the first end face and / or the coil and the second end face.

[0015] In one possible implementation, the magnetic core includes a central post located between the first side post and the second side post.

[0016] In one possible implementation, the magnetic core includes two central pillars, the two central pillars being a first central pillar and a second central pillar, the first central pillar and the second central pillar being spaced apart between the first side pillar and the second side pillar; the magnetic component includes two coils, the two coils being a first coil and a second coil, the first coil being sleeved on the first central pillar and the second coil being sleeved on the second central pillar.

[0017] In one possible implementation, the magnetic core includes three central pillars, namely a first central pillar, a second central pillar, and a third central pillar, with the first side pillar located between the first central pillar and the second central pillar, and the second side pillar located between the second central pillar and the third central pillar; the magnetic component includes three coils, namely a first coil, a second coil, and a third coil, with the first coil sleeved on the first central pillar, the second coil sleeved on the second central pillar, and the third coil sleeved on the third central pillar.

[0018] In one possible implementation, the magnetic core further includes a winding frame, which is sleeved on the central post, and the coil is sleeved on the winding frame.

[0019] In one possible implementation, the flexible insulating layer includes a nonwoven fabric layer, a silicone resin layer, a silicone rubber layer, or a polyethylene terephthalate layer.

[0020] In one possible implementation, the flexible insulating layer is bonded to the coil or the magnetic core.

[0021] In one possible implementation, a base is also included, which covers the opening and has lead holes through which the coil is led out and connected to an external switching power supply device.

[0022] In one possible implementation, the housing is provided with a plurality of magnetic components, which are arranged sequentially along a first direction;

[0023] Alternatively, multiple magnetic components may be arranged in multiple rows along the first direction and in multiple columns along the second direction;

[0024] Wherein, the first direction and the second direction are perpendicular to each other.

[0025] On the other hand, this application provides a switching power supply including any of the magnetic elements described above.

[0026] This application provides a magnetic component and a switching power supply. The magnetic component includes a housing, at least one magnetic element, and a thermally conductive adhesive layer. The housing has an opening. The magnetic element is disposed inside the housing and includes a magnetic core, at least one coil, and a flexible insulating layer. The coil is disposed inside the magnetic core, and the flexible insulating layer is disposed between the coil and the magnetic core. The thermally conductive adhesive layer fills the gaps between the magnetic core and the housing, as well as any two of the magnetic core, coil, and flexible insulating layer. In this embodiment, by providing a flexible insulating layer between the coil and the magnetic core, the flexible insulating layer can absorb the stress generated by the thermal expansion of the thermally conductive adhesive layer through deformation. This absorbs the stress on the magnetic core after the thermally conductive adhesive layer expands due to heat, ensuring the normal function of the magnetic component. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a simplified structural diagram of a magnetic element provided in one embodiment of this application;

[0029] Figure 2 This is a simplified structural diagram of a magnetic component provided in one embodiment of this application;

[0030] Figure 3 for Figure 2 Exploded view;

[0031] Figure 4 A schematic diagram of a magnetic component provided in an embodiment of this application;

[0032] Figure 5A schematic diagram of a magnetic component provided in another embodiment of this application;

[0033] Figure 6 A schematic diagram of a magnetic component provided in yet another embodiment of this application;

[0034] Figure 7 A schematic diagram of a magnetic component provided in yet another embodiment of this application;

[0035] Figure 8 A schematic diagram of a magnetic component provided in yet another embodiment of this application;

[0036] Figure 9 A schematic diagram of a magnetic component provided in yet another embodiment of this application;

[0037] Figure 10 A simplified diagram of the arrangement structure of magnetic components in a magnetic element provided in an embodiment of this application;

[0038] Figure 11 A simplified diagram of the arrangement structure of magnetic components in a magnetic element provided in another embodiment of this application.

[0039] Figure label:

[0040] 100 - Outer shell;

[0041] 200-Magnetic components;

[0042] 210 - Magnetic core; 211 - First end face; 212 - Second end face; 213 - Middle post; 2131 - First middle post; 2132 - Second middle post; 2133 - Third middle post; 214 - First side post; 215 - Second side post;

[0043] 220 - Coil; 221 - First coil; 222 - Second coil; 223 - Third coil;

[0044] 230 - Flexible insulation layer;

[0045] 240-winding bobbin;

[0046] 250 - Base;

[0047] X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0049] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0050] As described in the background section, in related technologies, the thermally conductive adhesive has a high coefficient of thermal expansion. When heated, the adhesive expands and may crack the magnetic core, thus affecting the normal function of the magnetic component. To address this issue, one related technology uses a thermally conductive adhesive with a lower coefficient of thermal expansion; however, this method results in higher costs. Another related technology reduces the power density of the magnetic component; however, reducing the power density increases the size of the components, leading to a larger overall volume, increased material usage, and higher costs.

[0051] In view of this, the embodiments of this application aim to provide a magnetic component and a switching power supply. By setting a flexible insulating layer between the coil and the magnetic core, the flexible insulating layer can absorb the stress generated by the thermal expansion of the thermally conductive adhesive layer through deformation. This absorbs the stress on the magnetic core after the thermally conductive adhesive layer expands due to heat, thus ensuring the normal function of the magnetic component. Compared with solutions in related technologies, this application improves the reliability of the magnetic component and saves costs without reducing the power density of the magnetic component.

[0052] The embodiments of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can gain a more detailed understanding of the content of this application. It should be noted that, in the description of this embodiment, the first direction X, the second direction Y, and the third direction Z are three different directions in three-dimensional space; for example, the first direction X, the second direction Y, and the third direction Z can be perpendicular to each other.

[0053] Please refer to Figures 1-11 This embodiment provides a magnetic element, including:

[0054] The housing 100 has a shape that can be configured as needed, for example, it can be cylindrical or prismatic. One side of the housing 100 has an opening to allow the magnetic component 200 to be inserted into or removed from the housing 100.

[0055] At least one magnetic component 200 is disposed within the housing 100. The magnetic component 200 includes a magnetic core 210, at least one coil 220, and a flexible insulating layer 230. The coil 220 is disposed on the magnetic core 210, and the flexible insulating layer 230 is disposed between the coil 220 and the magnetic core 210. The coil 220 can be formed by spirally winding wire, and can be a single coil, an inner and outer double coil, or a coil with a winding skeleton. The wire can be flat wire, round wire, triple-insulated wire, Litz wire, etc. In this embodiment, the flexible insulating layer 230 can be an elastic layer such as a non-woven fabric layer, a silicone resin layer, a silicone rubber layer, or a polyethylene terephthalate (PET or PEIT) layer.

[0056] A thermally conductive adhesive layer (not shown in the figure) is filled between the magnetic core 210 and the outer shell 100, as well as between any two of the magnetic core 210, coil 220 and flexible insulating layer 230. The thermally conductive adhesive layer can bond the magnetic component 200 to the outer shell 100 as a whole, and can also improve the heat dissipation capacity of the magnetic component 200, so that the magnetic component 200 can maintain good performance.

[0057] It is understood that in this embodiment, by providing a flexible insulating layer 230 between the coil 220 and the magnetic core 210, the flexible insulating layer 230 can absorb the stress on the magnetic core caused by the thermal expansion of the thermally conductive adhesive layer through deformation, thereby ensuring the normal function of the magnetic component.

[0058] In some embodiments, the area of ​​the flexible insulating layer 230 in this embodiment is greater than or equal to one-third of the projected area of ​​the coil 220 on the magnetic core 210, thereby ensuring that the flexible insulating layer 230 can better absorb the stress generated by the thermal expansion of the thermally conductive adhesive layer, providing a good buffering effect and reducing the probability of the magnetic component 200 cracking. In other embodiments of this invention, the area of ​​the flexible insulating layer 230 may also be greater than or equal to half of the projected area of ​​the coil 220 on the magnetic core 210.

[0059] Please continue to refer to Figures 4-6Specifically, the magnetic core 210 of this embodiment includes a first end face 211, a second end face 212, at least one central post 213, a first side post 214, and a second side post 215 disposed opposite to each other. The two ends of the central post 213, the first side post 214, and the second side post 215 are respectively connected to the first end face 211 and the second end face 212. The coil 220 is sleeved on the central post 213. Referring to the accompanying drawings, it can be understood that in this embodiment, part of the central post 213, part of the first side post 214, and part of the second side post 215 are integrally formed with the first end face 211, and another part of the central post 213, another part of the first side post 214, and another part of the second side post 215 are integrally formed with the second end face 212. The above two parts of the structure abut against each other along the first direction X to form the central post 213, the first side post 214, and the second side post 215. The coil 220 is wound on the central post 213.

[0060] like Figure 4 As shown, in some embodiments, the flexible insulating layer 230 can be disposed between the coil 220 and the first side post 214, and between the coil 220 and the second side post 215. It is understood that in other possible embodiments, the flexible insulating layer 230 may also be disposed only between the coil 220 and the first side post 214; or, only between the coil 220 and the second side post 215. The specific location and quantity of the flexible insulating layer 230 can be selected based on parameters such as the volume change of the thermally conductive adhesive layer after thermal expansion. Figure 4 As shown, in a plane perpendicular to the second direction Y, the projected area of ​​the flexible insulating layer 230 is greater than or equal to one-third of the projected area of ​​the coil 220 on the magnetic core 210, and more preferably, the projected area of ​​the flexible insulating layer 230 is greater than or equal to half of the projected area of ​​the coil 220 on the magnetic core 210 (the same applies below, and will not be repeated). It should be noted that, as... Figure 4 As shown, the side of the first side post 214 and the second side post 215 of the magnetic core 210 that is close to the coil 220 is set to be arc-shaped to match the shape of the coil 220. The flexible insulating layer 230 is also set to be arc-shaped to match the shape of the coil 220. At this time, the area of ​​the arc-shaped surface of the flexible insulating layer 230 is greater than or equal to one-third of the area of ​​the arc-shaped surface of the first side post 214 and the second side post 215.

[0061] like Figure 5As shown, in some embodiments, the flexible insulating layer 230 can be disposed between the coil 220 and the central post 213. The coil 220 is generally wound in a cylindrical shape, and two opposing flexible insulating layers 230 are provided inside the coil 220 along the second direction Y. It can be understood that the two flexible insulating layers 230 can also be disposed opposite each other inside the coil 220 along the third direction Z; or, only one flexible insulating layer 230 can be provided inside the coil 220; or, multiple flexible insulating layers 230 can be disposed circumferentially spaced inside the coil 220. The specific placement and number of the flexible insulating layers 230 can be selected based on parameters such as the volume change of the thermally conductive adhesive layer after thermal expansion. Figure 5 As shown, in a plane perpendicular to the second direction Y, the projected area of ​​the flexible insulating layer 230 is greater than or equal to one-third of the projected area of ​​the coil 220 on the magnetic core 210. It should be noted that, as... Figure 5 As shown, the side of the first side post 214 and the second side post 215 of the magnetic core 210 that is close to the coil 220 is set to be arc-shaped to match the shape of the coil 220. The flexible insulating layer 230 is also set to be arc-shaped to match the shape of the coil 220. At this time, the area of ​​the arc-shaped surface of the flexible insulating layer 230 is greater than or equal to one-third of the area of ​​the arc-shaped surface of the first side post 214 and the second side post 215.

[0062] like Figure 6 As shown, in some embodiments, the flexible insulating layer 230 can be disposed between the coil 220 and the first end face 211. It is understood that in other possible embodiments, the flexible insulating layer 230 can be disposed between the coil 220 and the second end face 212; or, the flexible insulating layer 230 can be disposed simultaneously between the coil 220 and the first end face 211 and between the coil 220 and the second end face 212. The specific location and quantity of the flexible insulating layer 230 can be selected based on parameters such as the volume change of the thermally conductive adhesive layer after thermal expansion. Figure 6 As shown, in a plane perpendicular to the first direction X, the projected area of ​​the flexible insulating layer 230 is greater than or equal to one-third of the projected area of ​​the coil 220 on the magnetic core 210.

[0063] In other possible embodiments, the flexible insulating layer 230 may be disposed between at least two of the following: coil 220 and first side post 214, coil 220 and second side post 215, coil 220 and middle post 213, coil 220 and first end face 211, and coil 220 and second end face 212. For example, the flexible insulating layer 230 may be disposed simultaneously between coil 220 and first side post 214 and between coil 220 and middle post 213; or, the flexible insulating layer 230 may be disposed simultaneously between coil 220 and first side post 214 and between coil 220 and first end face 211. The specific location and quantity of the flexible insulating layer 230 may be selected based on parameters such as the volume change of the thermally conductive adhesive layer after thermal expansion.

[0064] Please continue to refer to Figures 7-9 In this embodiment, the structure of the magnetic core 210 can also be configured as needed.

[0065] like Figure 7 As shown, in some embodiments, the magnetic core 210 includes a central post 213 located between the first side post 214 and the second side post 215. In this case, the flexible insulating layer 230 can be disposed between the coil 220 and the first side post 214, and between the coil 220 and the second side post 215. It is understood that, based on the above description, the flexible insulating layer 230 can also be disposed between the coil 220 and the central post 213; or, between the coil 220 and the first end face 211, and between the coil 220 and the second end face 212.

[0066] like Figure 8 As shown, in some embodiments, the magnetic core 210 includes two central pillars 213, each comprising a first central pillar 2131 and a second central pillar 2132, spaced apart between a first side pillar 214 and a second side pillar 215. The magnetic component 200 includes two coils 220, each comprising a first coil 221 and a second coil 222, the first coil 221 being sleeved on the first central pillar 2131 and the second coil 222 being sleeved on the second central pillar 2132. In this case, a flexible insulating layer 230 can be disposed between the first coil 221 and the first side pillar 214, and between the second coil 222 and the second side pillar 215. It is understood that, based on the above description, the flexible insulating layer 230 can also be disposed between the first coil 221 and the first central post 2131, between the second coil 222 and the second central post 2132; or, between the first coil 221 and the first end face 211, between the second coil 222 and the first end face 211, between the first coil 221 and the second end face 212, and between the second coil 222 and the second end face 212.

[0067] like Figure 9As shown, in some embodiments, the magnetic core 210 includes three central pillars 213, namely a first central pillar 2131, a second central pillar 2132, and a third central pillar 2133. A first side pillar 214 is located between the first central pillar 2131 and the second central pillar 2132, and a second side pillar 215 is located between the second central pillar 2132 and the third central pillar 2133. The magnetic component 200 includes three coils 220, namely a first coil 221, a second coil 222, and a third coil 223. The first coil 221 is sleeved on the first central pillar 2131, the second coil 222 is sleeved on the second central pillar 2132, and the third coil 223 is sleeved on the third central pillar 2133. At this time, the flexible insulating layer 230 can be disposed between the first coil 221 and the first side post 214, between the second coil 222 and the first side post 214, between the second coil 222 and the second side post 215, and between the third coil 223 and the second side post 215. It is understood that, based on the above description, the flexible insulating layer 230 can also be disposed between the first coil 221 and the first central post 2131, between the second coil 222 and the second central post 2132, and between the third coil 223 and the third central post 2133; or, between the first coil 221 and the first end face 211, between the second coil 222 and the first end face 211, between the third coil 223 and the first end face 211, between the first coil 221 and the second end face 212, between the second coil 222 and the second end face 212, and between the third coil 223 and the second end face 212.

[0068] Understandably, due to Figure 8 and Figure 9 The magnetic components 200 shown all include two or more coils 220, therefore compared to Figure 7 The magnetic component 200 shown can significantly improve the power density of the magnetic component 200.

[0069] Please continue to refer to Figure 3 In this embodiment, the magnetic core 210 further includes a winding bobbin 240, which is sleeved on the central post 213, and the coil 220 is sleeved on the winding bobbin 240. The winding bobbin 240 can be divided into two parts, which abut each other to form the winding bobbin 240. The shape of the winding bobbin 240 can be adapted to the shape of the central post 213. In this embodiment, the material of the winding bobbin 240 can be, for example, bakelite, nylon, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), or other materials with good insulation properties.

[0070] In this embodiment, the flexible insulating layer 230 can be bonded to the coil 220 or the magnetic core 210. Alternatively, the flexible insulating layer 230 can also be bonded to the coil 220 or the magnetic core 210 solely by the thermally conductive adhesive layer.

[0071] Please continue to refer to Figures 1-3 In this embodiment, the magnetic component 200 also includes a base 250, which covers the opening and has lead holes. The coil 220 is led out through the lead holes and connected to an external switching power supply device. By providing lead holes on the base 250, the connector of the coil 220 can be positioned, facilitating connection with the external switching power supply device.

[0072] In this embodiment, multiple magnetic components 200 can be disposed inside the housing 100 to meet the needs of multi-branch power supply applications.

[0073] For example, such as Figure 10 As shown, in some embodiments, the housing 100 may be provided with a plurality of magnetic elements 200, which are arranged sequentially along the first direction X.

[0074] For example, such as Figure 11 As shown, in some embodiments, the housing 100 may be provided with a plurality of magnetic elements 200, which are arranged in multiple rows along the first direction X and in multiple columns along the second direction Y.

[0075] In this embodiment, when assembling the magnetic components, flexible insulating material can be pre-attached between the outer side of the coil 220 and the magnetic core 210. Then, the coil 220 and the magnetic core 210 are combined to form a magnetic component 200. The magnetic component 200 is then partially or completely placed into the outer casing 100. Thermally conductive adhesive can be injected into the outer casing 100 before or after the magnetic component 200 is placed.

[0076] This embodiment also provides a switching power supply, including the aforementioned magnetic component.

[0077] It is understood that, due to the use of the aforementioned magnetic components, the switching power supply in this embodiment has improved reliability during use, thereby enabling the switching power supply to have a longer service life.

[0078] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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 of this application.

[0079] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0080] It should be noted that in the description of this application, the terms "first" and "second" are used only for convenience in describing different components and should not be construed as indicating or implying a sequential relationship, relative importance, or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features.

[0081] The embodiments or implementation methods in this application are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0082] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with an embodiment or example that are included in at least one embodiment or example of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A magnetic element, characterized in that, include: The outer casing has an opening; At least one magnetic component is disposed within the housing. The magnetic component includes a magnetic core, at least one coil, and a flexible insulating layer. The coil is disposed on the magnetic core, and the flexible insulating layer is disposed between the coil and the magnetic core. A thermally conductive adhesive layer is provided, which fills the gap between the magnetic core and the outer shell, as well as between any two of the magnetic core, the coil, and the flexible insulating layer.

2. The magnetic element according to claim 1, characterized in that, The area of ​​the flexible insulating layer is greater than or equal to one-third of the projected area of ​​the coil on the magnetic core.

3. The magnetic element according to claim 1, characterized in that, The magnetic core includes a first end face, a second end face, at least one central post, a first side post, and a second side post arranged opposite to each other. The two ends of the central post, the first side post, and the second side post are respectively connected to the first end face and the second end face. The coil is sleeved on the central post. The flexible insulating layer is disposed between the coil and the first side post and / or the coil and the second side post; And / or, the flexible insulating layer is disposed between the coil and the central column; And / or, the flexible insulating layer is disposed between the coil and the first end face and / or the coil and the second end face.

4. The magnetic element according to claim 3, characterized in that, The magnetic core includes a central post located between the first side post and the second side post.

5. The magnetic element according to claim 3, characterized in that, The magnetic core includes two central pillars, namely a first central pillar and a second central pillar, which are spaced apart between the first side pillar and the second side pillar; the magnetic component includes two coils, namely a first coil and a second coil, which are sleeved on the first central pillar and the second coil is sleeved on the second central pillar.

6. The magnetic element according to claim 3, characterized in that, The magnetic core includes three central pillars, namely a first central pillar, a second central pillar, and a third central pillar. The first side pillar is located between the first central pillar and the second central pillar, and the second side pillar is located between the second central pillar and the third central pillar. The magnetic component includes three coils, namely a first coil, a second coil, and a third coil. The first coil is sleeved on the first central pillar, the second coil is sleeved on the second central pillar, and the third coil is sleeved on the third central pillar.

7. The magnetic element according to claim 3, characterized in that, The magnetic core also includes a winding frame, which is sleeved on the central column, and the coil is sleeved on the winding frame.

8. The magnetic element according to claim 1, characterized in that, The flexible insulating layer includes a non-woven fabric layer, a silicone resin layer, a silicone rubber layer, or a polyethylene terephthalate layer.

9. The magnetic element according to claim 1, characterized in that, The flexible insulating layer is bonded to the coil or the magnetic core.

10. The magnetic element according to claim 1, characterized in that, It also includes a base that covers the opening and has lead holes on it, through which the coil is led out and connected to an external switching power supply device.

11. The magnetic element according to any one of claims 1-10, characterized in that, The outer casing contains a plurality of magnetic components, which are arranged sequentially along a first direction; Alternatively, multiple magnetic components may be arranged in multiple rows along the first direction and in multiple columns along the second direction; Wherein, the first direction and the second direction are perpendicular to each other.

12. A switching power supply, characterized in that, Includes the magnetic element as described in any one of claims 1-11.

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