Magnetic device

Abstract

The invention provides a magnetic device which comprises a magnetic core body, the magnetic core body comprises a first magnetic plate, a second magnetic plate, a magnetic column, a first magnetic wall and a second magnetic wall, the two opposite ends of the magnetic column, the first magnetic wall and the second magnetic wall are connected with the first magnetic plate and the second magnetic plate respectively, and the magnetic column is located between the first magnetic wall and the second magnetic wall. The first magnetic plate and the second magnetic plate are both provided with winding holes used for winding wires to penetrate through, and the winding holes are located in the first magnetic plate and the second magnetic plate between the first magnetic wall and the magnetic center column and between the second magnetic wall and the magnetic center column so as to form two or more mixed crossed magnetic circuits, and the heat dissipation performance of the magnetic device can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of magnetic devices, and in particular to a magnetic device. Background Art

[0002] The structure of the magnetic device is mainly composed of a magnetic core and a coil. The leakage inductance integrated transformer is a common magnetic device. The leakage inductance integrated transformer is a design that attempts to fully utilize the leakage inductance of the main transformer as a resonant inductor. However, the leakage inductance will also generate additional losses and heat while generating resonance, resulting in excessive heat. The existing magnetic devices cannot dissipate the heat quickly, which will affect the performance of the magnetic devices. Summary of the invention

[0003] In view of this, the present application provides a magnetic device to improve the heat dissipation performance of the magnetic device.

[0004] The present application provides a magnetic device, including a magnetic core body, wherein the magnetic core body includes a first magnetic plate, a second magnetic plate, a magnetic column, a first magnetic wall and a second magnetic wall, wherein the opposite ends of the magnetic column, the first magnetic wall and the second magnetic wall are respectively connected to the first magnetic plate and the second magnetic plate, and the magnetic column is located between the first magnetic wall and the second magnetic wall, and the first magnetic plate and the second magnetic plate are both provided with winding holes for winding wires, and the winding holes are located on the first magnetic plate and the second magnetic plate between the first magnetic wall and the magnetic center column and between the second magnetic wall and the magnetic center column, so as to form two or more hybrid cross magnetic circuits.

[0005] In some embodiments, one side of the first magnetic plate and the second magnetic plate that are not connected to the first magnetic wall and the second magnetic wall is hollow, the magnetic column includes a first magnetic center column and a second magnetic center column connected to the first magnetic center column, the side of the first magnetic center column facing away from the second magnetic center column is connected to the first magnetic plate, and the side of the second magnetic center column facing away from the first magnetic center column is connected to the second magnetic plate.

[0006] In some embodiments, the first magnetic wall includes a first magnet and a second magnet connected to the first magnet, the first magnet is connected to the first magnetic plate at a side facing away from the second magnet, and the second magnet is connected to the second magnetic plate at a side facing away from the first magnet.

[0007] In some embodiments, the second magnetic wall includes a third magnet and a fourth magnet connected to the third magnet, the side of the third magnet facing away from the fourth magnet is connected to the first magnetic plate, and the side of the fourth magnet facing away from the third magnet is connected to the second magnetic plate.

[0008] In some embodiments, the magnetic device also includes a first winding and a second winding, the function of the second winding is different from that of the first winding, the first winding is wound on the first magnetic wall by passing through the winding hole located on the first magnetic plate and the second magnetic plate and between the first magnetic wall and the magnetic column, and the second winding is wound on the magnetic column, so as to integrate more than two windings with different functions on the same magnetic core body.

[0009] In some embodiments, the magnetic device also includes a third winding, and the third winding has a different function from the first winding and the second winding. The third winding is wound on the second magnetic wall by passing through the winding hole located on the second magnetic plate and the first magnetic plate and between the second magnetic wall and the magnetic center column.

[0010] In some embodiments, the winding direction of the first winding and the third winding is different from the winding direction of the second winding.

[0011] In some embodiments, the magnetic device also includes a base, the surface of the base having a first protrusion and a second protrusion, the head end and the tail end of the first protrusion are respectively arranged opposite to the head end and the tail end of the second protrusion to form a fixing notch, and the first magnetic plate is engaged in the fixing notch to fix the magnetic core body on the base.

[0012] In some embodiments, a first via hole, a second via hole and a third via hole are provided on the base, the first via hole is located between the end of the first protrusion plate and the end of the second protrusion plate and is passed through the wire end of the first winding, the second via hole is located on the side of the first protrusion plate away from the second protrusion plate and is passed through the wire end of the second winding, and the third via hole is located between the head end of the first protrusion plate and the head end of the second protrusion plate and is passed through the wire end of the third winding.

[0013] In some embodiments, the first magnetic center column, the first magnet, the third magnet and the first magnetic plate are an integrally formed structure, and the second magnetic center column, the second magnet, the fourth magnet and the second magnetic plate are an integrally formed structure.

[0014] The present application provides a magnetic device, including a magnetic core body, the magnetic core body including a first magnetic plate, a second magnetic plate, a magnetic column, a first magnetic wall and a second magnetic wall, the opposite ends of the magnetic column, the first magnetic wall and the second magnetic wall are respectively connected to the first magnetic plate and the second magnetic plate, and the magnetic column is located between the first magnetic wall and the second magnetic wall, the first magnetic plate and the second magnetic plate are both provided with winding holes for winding wires, and the winding holes are located on the first magnetic plate and the second magnetic plate between the first magnetic wall and the magnetic center column and between the second magnetic wall and the magnetic center column, so as to form two or more hybrid cross magnetic circuits, so as to improve the heat dissipation performance of the magnetic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 is a schematic diagram of the three-dimensional structure of the magnetic device provided by the present application;

[0017] Figure 2 is a schematic diagram of the three-dimensional structure of the magnetic core body in the magnetic device provided in the present application;

[0018] Figure 3 It is a schematic diagram of the three-dimensional structure of the base in the magnetic device provided in this application.

[0019] Reference numerals:

[0020] 10. Magnetic device; 100. Magnetic core body; 110. First magnetic plate; 111. Winding hole; 120. Second magnetic plate; 130. First magnetic center column; 140. Second magnetic center column; 150. First magnet; 160. Second magnet; 170. Third magnet; 180. Fourth magnet; 200. First winding; 300. Second winding; 400. Third winding; 500. Base; 510. Fixed notch; 520. First through hole; 530. Second through hole; 540. Fourth through hole; 550. First convex plate. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application are clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In the absence of conflict, the following embodiments and their technical features can be combined with each other.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the description of the present application, the meaning of "several" is at least one, such as one, two, etc., unless otherwise clearly and specifically defined.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by a person skilled in the art to which this application belongs. The terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items. The terms "connection", "electrical connection", and "electrical connection" used herein include any direct and indirect electrical or structural connection means. Therefore, if the text describes a first device coupled / connected / electrically connected to a second device, it means that the first device can be directly electrically / structurally connected to the second device, or indirectly electrically / structurally connected to the second device through other devices or connection means.

[0024] The present application provides a magnetic device, including a magnetic core body, the magnetic core body including a first magnetic plate, a second magnetic plate, a magnetic column, a first magnetic wall and a second magnetic wall, the opposite ends of the magnetic column, the first magnetic wall and the second magnetic wall are respectively connected to the first magnetic plate and the second magnetic plate, and the magnetic column is located between the first magnetic wall and the second magnetic wall, the first magnetic plate and the second magnetic plate are both provided with winding holes for winding wires, and the winding holes are located on the first magnetic plate and the second magnetic plate between the first magnetic wall and the magnetic center column and between the second magnetic wall and the magnetic center column, so as to form two or more hybrid cross magnetic circuits.

[0025] In the present application, winding holes are provided on the first magnetic plate and the second magnetic plate of the magnetic core body to increase the contact area between the magnetic device and the air and allow external airflow to more easily enter the interior of the magnetic core body, so that the leakage inductance will generate additional losses while generating resonance, and the heat can be quickly dissipated from the interior of the magnetic core body as soon as possible, thereby improving the heat dissipation efficiency of the magnetic device.

[0026] See also Figure 1-Figure 3 , Figure 1 is a schematic diagram of the three-dimensional structure of the magnetic device provided by the present application; Figure 2 is a schematic diagram of the three-dimensional structure of the magnetic core body in the magnetic device provided in the present application; Figure 3It is a schematic diagram of the three-dimensional structure of the base in the magnetic device provided by the present application. The present application provides a magnetic device 10, including a magnetic core body 100, the magnetic core body 100 includes a first magnetic plate 110, a second magnetic plate 120, a magnetic column, a first magnetic wall and a second magnetic wall, the opposite ends of the magnetic column, the first magnetic wall and the second magnetic wall are respectively connected to the first magnetic plate 110 and the second magnetic plate 120, and the magnetic column is located between the first magnetic wall and the second magnetic wall, the first magnetic plate 110 and the second magnetic plate 120 are both provided with a winding hole 111 for winding through, and the winding hole 111 is located on the first magnetic plate 110 and the second magnetic plate 120 between the first magnetic wall and the magnetic center column and between the second magnetic wall and the magnetic center column, so as to form two or more hybrid cross magnetic circuits.

[0027] In the present application, winding holes 111 are provided on the first magnetic plate 110 and the second magnetic plate 120 of the magnetic core body 100, that is, winding holes 111 are provided at the bottom and the top of the magnetic core body 100, so as to increase the contact area between the magnetic device 10 and the air and make it easier for the external airflow to enter the interior of the magnetic core body 100, so that the leakage inductance will generate additional losses and heat while generating resonance, which can be quickly dissipated from the interior of the magnetic core body 100 as soon as possible, thereby improving the heat dissipation efficiency of the magnetic device 10; winding holes 111 are provided on the first magnetic plate 110 and the second magnetic plate 120 of the magnetic core body 100, so that two or more mixed cross magnetic circuits can be introduced into the same magnetic core body 100, so that the interior of the magnetic core body 100 The magnetic flux distribution is more uniform, which improves the overall utilization of the magnetic circuit and the utilization of the magnetic core body 100. At the same time, the part of the common magnetic circuit is reduced, thereby reducing the magnetic flux interference of the common magnetic circuit and improving the performance of the magnetic device 10; by opening the winding hole 111 on the first magnetic plate 110 and the second magnetic plate 120 of the magnetic core body 100, the magnetic circuit portion with the smallest effective cross-sectional area can be offset, thereby reducing the magnetic flux density of this portion, and reducing the magnetic flux density helps to reduce the iron loss of the magnetic device 10, thereby improving energy efficiency; by opening the winding hole 111 at the bottom and top of the magnetic core body 100, it is possible to integrate the functions of multiple magnetic devices 10, including but not limited to resonant inductors and filter inductors, thereby improving the utilization of the magnetic core body 100.

[0028] In one embodiment, the side of the first magnetic plate 110 and the second magnetic plate 120 that are not connected to the first magnetic wall and the second magnetic wall is hollow, that is, the side of the first magnetic plate 110 and the second magnetic plate 120 that are not connected to the first magnetic wall and the second magnetic wall is a hollow structure, the magnetic column includes a first magnetic center column 130 and a second magnetic center column 140 connected to the first magnetic center column 130, the side of the first magnetic center column 130 away from the second magnetic center column 140 is connected to the first magnetic plate 110, and the side of the second magnetic center column 140 away from the first magnetic center column 130 is connected to the second magnetic plate 120, that is, the magnetic column is formed by assembling a two-part structure. By assembling the magnetic column from two parts, the difficulty of assembling the subsequent winding can be reduced, which is convenient for winding or assembly, and the side of the first magnetic plate 110 and the second magnetic plate 120 that are not connected to the first magnetic wall and the second magnetic wall is hollow, so as to further facilitate winding or assembly, and reduce the difficulty of producing the magnetic device 10.

[0029] In one embodiment, the first magnetic wall includes a first magnet 150 and a second magnet 160 connected to the first magnet 150, the side of the first magnet 150 facing away from the second magnet 160 is connected to the first magnetic plate 110, and the side of the second magnet 160 facing away from the first magnet 150 is connected to the second magnetic plate 120, that is, the first magnetic wall is formed by assembling two parts. By assembling the first magnetic wall by two parts, the difficulty of assembling the subsequent winding can be reduced, so as to further facilitate the winding or assembly of the winding.

[0030] In one embodiment, the second magnetic wall includes a third magnet 170 and a fourth magnet 180 connected to the third magnet 170, the side of the third magnet 170 facing away from the fourth magnet 180 is connected to the first magnetic plate 110, and the side of the fourth magnet 180 facing away from the third magnet 170 is connected to the second magnetic plate 120, that is, the second magnetic wall is formed by assembling two parts. By assembling the second magnetic wall by two parts, the difficulty of assembling the subsequent winding can be reduced, so as to further facilitate the winding or assembly of the winding.

[0031] In one embodiment, the magnetic device 10 also includes a first winding 200 and a second winding 300. The function of the second winding 300 is different from that of the first winding 200. The first winding 200 is wound on the first magnetic wall by passing through a winding hole 111 located on the first magnetic plate 110 and the second magnetic plate 120 and between the first magnetic wall and the magnetic column. The second winding 300 is wound on the magnetic column, so as to integrate more than two windings with different functions on the same magnetic core body 100. Specifically, the first winding 200 is a resonant winding, and the second winding 300 is a main transformer winding. The resonant winding is used to generate a resonance effect. The resonant winding is also used to improve the selectivity of the circuit and adjust the circuit parameters. The main transformer winding is used to transmit electric energy, provide a stable output voltage, and withstand the effects of current and voltage. The first winding 200 and the second winding 300 are both formed by winding a wire. The wire diameter of the main transformer winding is larger than the wire diameter of the resonant winding. The wire forming the first winding 200 and the second winding 300 can be a round wire or a flat wire, etc., which is not limited here. In this embodiment, the wire forming the first winding 200 and the second winding 300 is a round wire as an example for explanation. A wire passes through a winding hole 111 located on the first magnetic plate 110 and the second magnetic plate 120 and between the first magnetic wall and the magnetic column, and is wound on the first magnet 150 and the second magnet 160 to form the first winding 200; another wire is wound on the first magnetic center column 130 and the second magnetic center column 140 to form the second winding 300.

[0032] In the present application, through holes are provided at the top and bottom of the magnetic core body 100 so that the wire of the first winding 200 can pass through the winding hole 111, so as to be wound on the first magnet 150 and the second magnet 160 to form the first winding 200, and to be wound on the magnetic column to form the second winding 300, so that two or more windings with different functions can be integrated on the same magnetic core body 100 without adding additional magnetic cores, such as without adding a resonant magnetic core body 100 separately, thereby reducing the number and occupied space of the magnetic core body 100, improving the utilization rate and overall performance of the magnetic core body 100, and reducing the volume of the magnetic body; the wire diameter of the second winding 300 is set to be larger than the wire diameter of the first winding 200 The diameter of the wire of the first winding 200 can be reduced to increase the current distribution area on the surface of the wire, which can more effectively reduce the parasitic resistance and loss, that is, reduce the influence of the skin effect, thereby improving the resonance performance, making the resonance frequency more stable, and improving the working efficiency of the entire circuit. At the same time, the wire forming the first winding 200 uses a thinner wire, which promotes more effective heat dissipation at high frequencies, prevents the first winding 200 from overheating, protects the first winding 200 from damage, and extends the service life of the magnetic device 10. The use of a thinner wire in the first winding 200 can reduce material costs, and it is easier to achieve complex shapes and layouts during the winding process, thereby improving the flexibility and manufacturability of the first winding 200.

[0033] In one embodiment, the magnetic device 10 further includes a third winding 400. The third winding 400 and the first winding 200 and the second winding 300 have different functions. The third winding 400 is wound on the second magnetic wall by passing through a winding hole 111 located on the second magnetic plate 120 and the first magnetic plate 110 and between the second magnetic wall and the magnetic center column. Specifically, the third winding 400 can be a resonant winding; the third winding 400 is also formed by winding a wire. The wire diameter of the second winding 300 is greater than the wire diameter of the first winding 200 and the third winding 400. The wire forming the third winding 400 can be a round wire or a flat wire, etc., which is not limited here. In this embodiment, the wire forming the third winding 400 is a round wire as an example for explanation. Another wire passes through a winding hole 111 located on the first magnetic plate 110 and the second magnetic plate 120 and between the second magnetic wall and the magnetic column and is wound on the third magnet 170 and the fourth magnet 180 to form the third winding 400. It should be noted that the number of the first winding 200, the second winding 300 and the third winding 400 is not limited to one, and can also be multiple, such as two, three or five, etc., which is not limited here. In this embodiment, the number of the first winding 200, the second winding 300 and the third winding 400 is one for illustration. By winding the third winding 400 on the third magnet 170 and the fourth magnet 180, the utilization rate and overall performance of the magnetic core body 100 are further improved and the volume of the magnetic body is reduced; the wire diameter of the second winding 300 is set to be larger than the wire diameter of the third winding 400, so that the parasitic resistance and loss can be further reduced and the heat dissipation performance can be further improved by reducing the wire diameter of the third winding 400.

[0034] In one embodiment, the winding direction of the first winding 200 and the third winding 400 is different from the winding direction of the second winding 300. Specifically, the winding direction of the first winding 200 and the third winding 400 is perpendicular to the winding direction of the second winding 300, so as to further improve the utilization rate of the magnetic circuit and the utilization rate of the magnetic core, and reduce the interference of the common magnetic circuit flux and reduce the iron loss of the magnetic device 10; optionally, the winding direction of the first winding 200 is opposite to the winding direction of the third winding 400, so as to further improve the utilization rate of the magnetic circuit and the utilization rate of the magnetic core, and reduce the interference of the common magnetic circuit flux and reduce the iron loss of the magnetic device 10.

[0035] In one embodiment, the magnetic device 10 further includes a base 500, the surface of the base 500 has a first convex plate 550 and a second convex plate which are convexly arranged, the head end and the tail end of the first convex plate 550 are respectively arranged opposite to the head end and the tail end of the second convex plate to form a fixing notch 510, and the first magnetic plate 110 is engaged in the fixing notch 510 to fix the magnetic core body 100 on the base 500. By providing the base 500, the relative positions of various components can be determined, which is conducive to the installation of the magnetic device 10 on the PCB board, and at the same time, by providing the first convex plate 550 and the second convex plate for forming the fixing notch 510 on the base 500, the first magnetic plate 110 is engaged in the fixing notch 510, so as to improve the connection stability between the two.

[0036] In one embodiment, the base 500 is provided with a first through hole 520, a second through hole 530 and a third through hole. The first through hole 520 is located between the end of the first protruding plate 550 and the end of the second protruding plate and is penetrated by the wire end of the first winding 200. The second through hole 530 is located on the side of the first protruding plate 550 away from the second protruding plate and is penetrated by the wire end of the second winding 300. The third through hole is located between the head end of the first protruding plate 550 and the head end of the second protruding plate and is penetrated by the wire end of the third winding 400. In the direction from the magnetic core body 100 to the base 500, the shape of the first protruding plate 550 and the second protruding plate is similar to a U-shaped structure. The base 500 is provided with through holes for penetrating the wire ends of the first winding 200, the second winding 300 and the third winding 400, respectively, so as to fix the wire ends of the windings and facilitate connection with other components.

[0037] In one embodiment, the first magnetic center column 130, the first magnet 150, the third magnet 170 and the first magnetic plate 110 are an integrally formed structure, and the second magnetic center column 140, the second magnet 160, the fourth magnet 180 and the second magnetic plate 120 are an integrally formed structure to reduce the risk of loose connections between the components, thereby ensuring the reliability of the magnetic device 10.

[0038] In one embodiment, the first magnetic center column 130, the first magnet 150, the third magnet 170 and the first magnetic plate 110 form a first magnetic core, the second magnetic center column 140, the second magnet 160, the fourth magnet 180 and the second magnetic plate 120 form a second magnetic core, and the first magnetic core and the second magnetic core are both E-shaped structures, that is, the first magnetic core and the second magnetic core are symmetrical structures, that is, an EE type structure, so as to further improve the heat dissipation efficiency of the magnetic device 10, the overall utilization rate of the magnetic circuit and the utilization rate of the magnetic core body 100, while facilitating the assembly of the magnetic device 10.

[0039] In another embodiment, the first magnetic core and the second magnetic core may be EF or ER type structures to further improve the heat dissipation efficiency of the magnetic device 10 , the overall utilization of the magnetic circuit, and the utilization of the magnetic core body 100 , while facilitating the assembly of the magnetic device 10 .

[0040] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structural or equivalent process transformations made using the contents of the specification and drawings of the present application, such as the mutual combination of technical features between the embodiments, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A magnetic device, characterized in that: It includes a magnetic core body, which includes a first magnetic plate, a second magnetic plate, a magnetic column, a first magnetic wall and a second magnetic wall. The opposite ends of the magnetic column, the first magnetic wall and the second magnetic wall are respectively connected to the first magnetic plate and the second magnetic plate, and the magnetic column is located between the first magnetic wall and the second magnetic wall. The first magnetic plate and the second magnetic plate are both provided with winding holes for winding wires, and the winding holes are located on the first magnetic plate and the second magnetic plate between the first magnetic wall and the magnetic center column and between the second magnetic wall and the magnetic center column, so as to form two or more hybrid cross magnetic circuits.

2. The magnetic device according to claim 1, characterized in that: One side of the first magnetic plate and the second magnetic plate that are not connected to the first magnetic wall and the second magnetic wall is hollow, the magnetic column includes a first magnetic center column and a second magnetic center column connected to the first magnetic center column, the side of the first magnetic center column facing away from the second magnetic center column is connected to the first magnetic plate, and the side of the second magnetic center column facing away from the first magnetic center column is connected to the second magnetic plate.

3. The magnetic device according to claim 2, characterized in that: The first magnetic wall includes a first magnet and a second magnet connected to the first magnet, a side of the first magnet facing away from the second magnet is connected to the first magnetic plate, and a side of the second magnet facing away from the first magnet is connected to the second magnetic plate.

4. The magnetic device according to claim 3, characterized in that: The second magnetic wall includes a third magnet and a fourth magnet connected to the third magnet. The side of the third magnet facing away from the fourth magnet is connected to the first magnetic plate. The side of the fourth magnet facing away from the third magnet is connected to the second magnetic plate.

5. The magnetic device according to claim 1, characterized in that: The magnetic device also includes a first winding and a second winding, the function of the second winding is different from that of the first winding, the first winding is wound on the first magnetic wall by passing through the winding holes located on the first magnetic plate and the second magnetic plate and between the first magnetic wall and the magnetic column, and the second winding is wound on the magnetic column, so as to integrate more than two windings with different functions on the same magnetic core body.

6. The magnetic device according to claim 5, characterized in that: The magnetic device also includes a third winding, and the third winding has a different function from the first winding and the second winding. The third winding is wound on the second magnetic wall by passing through the winding hole located on the second magnetic plate and between the second magnetic wall and the first magnetic plate and the magnetic center column.

7. The magnetic device according to claim 6, characterized in that: The winding direction of the first winding and the third winding is different from the winding direction of the second winding.

8. The magnetic device according to claim 6, characterized in that: The magnetic device also includes a base, the surface of the base has a first convex plate and a second convex plate, the head end and the tail end of the first convex plate are respectively arranged opposite to the head end and the tail end of the second convex plate to form a fixing notch, and the first magnetic plate is engaged in the fixing notch to fix the magnetic core body on the base.

9. The magnetic device according to claim 8, characterized in that: The base is provided with a first via hole, a second via hole and a third via hole, the first via hole is located between the end of the first protrusion plate and the end of the second protrusion plate and is passed through the wire end of the first winding, the second via hole is located on the side of the first protrusion plate away from the second protrusion plate and is passed through the wire end of the second winding, and the third via hole is located between the head end of the first protrusion plate and the head end of the second protrusion plate and is passed through the wire end of the third winding.

10. The magnetic device according to claim 4, characterized in that: The first magnetic center column, the first magnet, the third magnet and the first magnetic plate are an integrally formed structure, and the second magnetic center column, the second magnet, the fourth magnet and the second magnetic plate are an integrally formed structure.

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