Magnetic element and electronic device

Abstract

The embodiment of the present application provides a kind of magnetic element and electronic equipment.The magnetic element includes top plate, bottom plate, column, winding and magnetic conducting part;Top plate and bottom plate are spaced apart, and column is fixedly connected to top plate and bottom plate;Winding includes at least coil connected with each other, winding is wound on the outer surface of column;Or, the magnetic element can also include yoke part, yoke part is fixedly connected top plate and / or bottom plate, magnetic conducting part is fixedly connected to the outer surface of column or yoke part, and magnetic conducting part is embedded between the gap of at least two adjacent layers of coil or magnetic conducting part is located on the side of winding towards top plate or bottom plate.The embodiment of the present application can reduce leakage flux of the magnetic element by setting magnetic conducting part.

Description

Technical Field

[0001] This application relates to the field of magnetic components, and more particularly to a magnetic element and electronic device. Background Technology

[0002] Some electronic devices contain magnetic components, which can play a role in energy storage, filtering, and other functions. They are important components that can ensure the stable and safe operation of electronic devices.

[0003] When magnetic components are operating, magnetic flux usually leaks into the air, creating a leakage flux phenomenon, which causes a decrease in the inductance of the magnetic component. Increasing the current flowing through the windings exacerbates the leakage flux phenomenon, leading to a more significant decrease in inductance.

[0004] Therefore, it is necessary to provide a magnetic element that can solve the problem of magnetic flux leakage. Summary of the Invention

[0005] This application provides a magnetic element and an electronic device. The magnetic element can be applied to electronic devices, and can solve the problem of magnetic flux leakage and reduce AC losses in the magnetic element.

[0006] In a first aspect, embodiments of this application provide a magnetic element, including a top plate, a bottom plate, a column, a winding, and a magnetically conductive part; the top plate and the bottom plate are spaced apart, and the column is fixedly connected between the top plate and the bottom plate; the winding includes at least two interconnected coil layers, and the winding is wound around the outer surface of the column; the magnetically conductive part is fixedly connected to the outer surface of the column, and the magnetically conductive part is embedded in the gap between at least a portion of two adjacent coil layers, or the magnetically conductive part is located on the side of the winding facing the top plate or the bottom plate. The number of columns can be one, two, or three, etc., and the outer surface of each column can be provided with a winding. The fixed connection of the magnetically conductive part to the outer surface of the column can be understood as follows: when the number of columns is one, the outer surface of this column is provided with a magnetically conductive part; when the number of columns is at least two, the outer surfaces of some (at least one) columns can be fixedly connected with magnetically conductive parts, while the outer surfaces of other columns may not be fixedly connected with magnetically conductive parts, or all the outer surfaces of the columns may be provided with magnetically conductive parts. The number of magnetically conductive parts on the outer surface of the column can be one, two, or three, etc. These magnetically conductive parts can all be embedded in the gaps between at least partially adjacent layers of coils, and are not located on the side of the winding facing the top or bottom plate; alternatively, some magnetically conductive parts can be embedded in the gaps between adjacent coils, while others can be located on the side of the winding facing the top or bottom plate; or, the magnetically conductive parts can be located on the side of the winding facing the top or bottom plate, and are not embedded in the gaps between adjacent coils. The phrase "the magnetically conductive parts are embedded in the gaps between at least partially adjacent layers of coils" can be understood as meaning that there can be a gap between some of the adjacent layers of coils, and no gap between another part of the adjacent layers of coils, or that there can be a gap between any two adjacent layers of coils, with the magnetically conductive parts embedded in at least one gap.

[0007] This embodiment of the application reduces leakage flux, increases inductance, and reduces AC losses in the winding by providing a magnetically conductive part on the column. Specifically, by providing a magnetically conductive part on the column and extending it into the gap between adjacent coils or by positioning the magnetically conductive part on the side of the winding facing the top or bottom plate, the magnetically conductive part provides a low-resistivity channel for leakage flux (the magnetic resistance of the magnetically conductive part is typically less than that of air). As the leakage flux passes through the magnetically conductive part, it is confined within the air, reducing the flux leaking into the air, increasing inductance, and improving the performance of the magnetic component. Some of the flux leaking into the air (i.e., leakage flux) cuts through the winding, generating an electromotive force in the winding, which increases the AC resistivity of the winding, thus increasing AC losses. By providing a magnetically conductive part on the column, a low-resistivity channel is provided for the leakage flux. As the leakage flux passes through the magnetically conductive part, it no longer cuts through the winding, reducing the AC resistivity of the winding and thereby lowering AC losses. In addition, when the magnetic conductor extends between the windings, it can increase the heat dissipation area, and the heat energy of the windings can be dissipated through the column and the magnetic conductor, which is beneficial to the heat dissipation of the windings.

[0008] In one possible implementation, the number of columns is at least two, and the at least two columns are spaced apart along a first direction. Each column has a winding on its outer surface, and at least one column has a magnetically conductive portion. One end of the magnetically conductive portion extends away from the column to an adjacent column. The columns, top plate, another adjacent column, and bottom plate can form a carrier for a closed magnetic flux loop, allowing the magnetic flux of the winding to pass through and forming a magnetic flux loop. This loop can constrain the magnetic flux around each winding, but leakage flux will still exist around the winding. In this embodiment, one end of the magnetically conductive portion is connected to one column, and the other end is connected to another column. Leakage flux will not pass through air when passing through the carrier of the magnetic flux loop of the column, magnetically conductive portion, another column, and another magnetically conductive portion, thus reducing leakage flux. In other implementations, the end of the magnetically conductive portion away from the column may also have a gap with another column, i.e., it does not extend to another column; this application does not limit this.

[0009] Secondly, embodiments of this application provide a magnetic element, including a top plate, a bottom plate, a column, a winding, a yoke, and a magnetically conductive part; the top plate and the bottom plate are spaced apart, and the column is fixedly connected between the top plate and the bottom plate; the winding includes at least two interconnected coil layers, and the winding is wound around the outer surface of the column; the yoke is located on one side of the winding and is fixedly connected to the top plate and / or the bottom plate. The magnetically conductive part is fixedly connected to the outer surface of the column, or, the magnetically conductive part is fixedly connected to the side of the yoke facing the winding; the magnetically conductive part is embedded in the gap between at least partially adjacent two layers of the coil, or, the magnetically conductive part is located on the side of the winding facing the top plate or the bottom plate. The number of columns can be one, two, or three, etc. Each column's outer surface can be provided with a winding. The magnetic conductive part being fixedly connected to the outer surface of the column can be understood as follows: when there is one column, its outer surface can be provided with a magnetic conductive part; when there are at least two columns, some (at least one) of the columns' outer surfaces can be fixedly connected with magnetic conductive parts, while others may not be fixedly connected, or all columns may have magnetic conductive parts on their outer surfaces. Each winding's outer periphery can be provided with one, two, or more yokes. The magnetic conductive part being fixedly connected to the side of the yoke facing the winding can be understood as follows: when there is one yoke, this yoke is provided with a magnetic conductive part; when there are at least two yokes, some (at least one) of the yokes can be fixedly connected with magnetic conductive parts, while others may not be fixedly connected, or all yokes may have magnetic conductive parts. The number of magnetically conductive parts on the outer surface of the column or yoke can be one, two, or three, etc. The magnetically conductive parts can all be embedded in the gap between at least part of two adjacent coil layers and are not located on the side of the winding facing the top or bottom plate; or, some magnetically conductive parts can be embedded in the gap between adjacent coils and other magnetically conductive parts can be located on the side of the winding facing the top or bottom plate; or, the magnetically conductive parts can be located on the side of the winding facing the top or bottom plate and are not embedded in the gap between adjacent coils.

[0010] In this embodiment, a yoke can be provided. The column, top plate, yoke, and bottom plate can form a carrier for a closed magnetic flux loop, which is beneficial for confining the magnetic flux around the winding. By providing a magnetically conductive part on the column or yoke, extending into the gap between adjacent coils or located on the side of the winding facing the top or bottom plate, the magnetically conductive part provides a low-resistivity channel for leakage flux (the magnetic resistance of the magnetically conductive part is usually less than that of air). The leakage flux passes through the magnetically conductive part, which can confine the leakage flux in the air, reduce the flux leaking into the air, and increase the inductance. By providing a magnetically conductive part on the column or yoke, the leakage flux cutting through the winding can also be reduced, the coefficient of AC resistance of the winding is reduced, and thus the AC loss of the winding can be reduced. In addition, when the magnetically conductive part extends between the windings, it can increase the heat dissipation area, and the heat energy of the winding can be dissipated through the column and the magnetically conductive part, which is beneficial for the heat dissipation of the winding.

[0011] In one possible implementation, the magnetically conductive part and the column are an integral structure, or the magnetically conductive part and the yoke are an integral structure. It is understood that if the magnetically conductive part and the column, or the magnetically conductive part and the yoke, are assembled as separate structures, an air gap will exist at the connection point, increasing the leakage flux within the magnetic element.

[0012] In one possible implementation, the end of the magnetically conductive part facing away from the column extends to an adjacent column; or, the end of the magnetically conductive part facing away from the column extends to the yoke; or, the end of the magnetically conductive part facing away from the yoke extends to the column. By providing the magnetically conductive part to extend into contact with the column or yoke, with one end connected to the column or yoke and the other end extending to another column or yoke capable of forming a magnetic flux loop, the space occupied by the magnetically conductive part can be increased, preventing the magnetic flux from passing through the air.

[0013] In one possible implementation, the yoke connecting the magnetically conductive part and the post are arranged along a first direction and form a first yoke; or, the yoke connecting the magnetically conductive part and the post are arranged along a second direction and form a second yoke, where the first direction intersects the second direction. One or more yokes with magnetically conductive parts can be correspondingly provided around each post to constrain the magnetic flux around the winding and reduce the AC loss of the winding. It is understood that the number of posts can be one or more. When there are multiple posts, the multiple posts can be arranged along the first direction, and the first yoke can be located between adjacent posts or at the edge of the magnetic element. In this embodiment, yokes can be provided in both the first and second directions to effectively constrain the magnetic flux around the winding and reduce the AC loss of the winding.

[0014] In one possible implementation, the number of posts is at least two, and the at least two posts are spaced apart along the first direction. Each post has a winding on its outer surface. The number of second yokes is at least two, and a gap is provided between adjacent second yokes in the first direction. It is understood that some posts may not have second yokes around them. By providing gaps between adjacent second yokes in the first direction, heat dissipation of the winding is facilitated, preventing the winding temperature from rising, which in turn increases the temperature of the posts, reduces the permeability of the posts, and consequently decreases the inductance.

[0015] In one possible implementation, the number of windings is at least two, and the number of magnetic flux loops corresponding to each winding is equal. By setting the number of magnetic flux loops corresponding to each winding to be equal, the difference in magnetic flux density between the top and bottom plates corresponding to each winding can be reduced, and the attenuation of magnetic permeability of the top plate, bottom plate, and column corresponding to the winding with fewer magnetic flux loops can be avoided.

[0016] In one possible implementation, the number of columns is at least three, and the at least three columns are arranged at intervals along a first direction. A third yoke is provided between each pair of adjacent columns, and a gap is provided between the third yoke and the magnetically conductive part. In the first direction, the two columns located at opposite ends of the magnetic element are respectively provided with the second yoke. The second yoke connecting the magnetically conductive part and the columns are arranged along the second direction, which intersects the first direction. The gap between the third yoke and the magnetically conductive part can be understood as the third yoke not having a magnetically conductive part. This embodiment of the application, by providing the second yoke corresponding to the two columns located at opposite ends of the magnetic element, facilitates that the magnetic flux loop corresponding to the winding wound on each column is equal, thus reducing the difference in inductance among multiple columns.

[0017] In one possible implementation, the number of magnetically conductive parts is at least two, namely a first magnetically conductive part and a second magnetically conductive part arranged at intervals. The first magnetically conductive part is located on the side of the second magnetically conductive part facing the top plate, or the first magnetically conductive part is located on the side of the second magnetically conductive part facing the bottom plate. The dimension of the first magnetically conductive part in a third direction is greater than the dimension of the second magnetically conductive part in the third direction, where the third direction is the arrangement direction of the top plate and the bottom plate. It is understood that in this embodiment, the first magnetically conductive part can be correspondingly disposed at the connection between the top plate and the column, and the first magnetically conductive part can also be correspondingly disposed at the connection between the bottom plate and the column. The number of the first magnetically conductive part can be one, two, or three, etc., and the number of the second magnetically conductive part can be one, two, or three, etc. This application does not limit the number of the first and second magnetically conductive parts. There may be air gaps at the connection between the top plate and the column, and at the connection between the bottom plate and the column. Therefore, the magnetic flux leakage at the connection between the top plate and the column and at the connection between the bottom plate and the column is greater than that at other locations. By setting the size of the first magnetic guide part in the third direction to be greater than that of the second magnetic guide part in the third direction, saturation of the magnetic guide part in the location with more magnetic flux leakage can be avoided.

[0018] In one possible implementation, the column comprises a first section and a second section, with an air gap between them. The dimension of the magnetically conductive part corresponding to the air gap in a third direction is larger than the dimensions of the other magnetically conductive parts in the third direction, where the third direction is the arrangement direction of the top plate and the bottom plate. The amount of magnetic flux leakage at the air gap will increase. By setting the dimension of the magnetically conductive part corresponding to the air gap in a third direction to be larger than the dimensions of the other magnetically conductive parts in the third direction, saturation of the magnetically conductive parts in locations with high magnetic flux leakage can be avoided.

[0019] In one possible implementation, the magnetic element includes a housing and a colloid. The top plate, the bottom plate, the column, and the winding are all located within the housing. The colloid is located between the housing and the top plate, bottom plate, column, and winding. A gap is provided between the colloid and the yoke. The housing can be made of iron or aluminum, etc., and the colloid can be a heat-dissipating adhesive, etc. This application is not limited in this regard. By providing the housing and the colloid, the heat of the winding can be conducted away through the housing and the colloid, which can reduce the decrease in inductance of the magnetic element caused by the temperature rise of the winding and the column. The temperature rise of the winding will cause the temperature of the colloid to rise, and the volume of the colloid will increase. If the colloid is in contact with the yoke, a large force will be exerted on the yoke when the volume of the colloid increases, causing the connection between the yoke and the top plate and the bottom plate to loosen or break, resulting in structural instability. In this embodiment, a gap is provided between the colloid and the yoke, so that the colloid will not compress the yoke when it expands due to heat.

[0020] Thirdly, embodiments of this application provide an electronic device, including a power conversion circuit and a magnetic element as described in any of the preceding claims, wherein the magnetic element is electrically connected to the power conversion circuit. The power conversion circuit can effectively convert input energy into the signal power required by the load. The magnetic element in the power conversion circuit can function as energy storage or filtering, and can be a component that generates an electromotive force using the changing current in the power conversion circuit, such as a power inductor. The electronic device can be an inverter, a communication power supply, or an energy storage device. Attached Figure Description

[0021] The accompanying drawings used in the embodiments of this application are described below.

[0022] Figure 1 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application;

[0023] Figure 2 This is a three-dimensional structural schematic diagram of a magnetic element provided in an embodiment of this application;

[0024] Figure 3 yes Figure 2 The diagram shows the exploded structure of the magnetic component.

[0025] Figure 4 yes Figure 2 Side view of the magnetic component shown;

[0026] Figure 5 yes Figure 2 A top view of a portion of the structure of the magnetic element shown;

[0027] Figure 6 This is a schematic diagram of the leakage flux cutting winding of a magnetic element without a magnetic conductor.

[0028] Figure 7 This is a schematic diagram of the magnetic flux loop around the winding after the magnetic conductor is installed in the yoke;

[0029] Figure 8 This is a schematic diagram of another magnetic element provided in an embodiment of this application;

[0030] Figure 9 This is a schematic diagram of another magnetic element provided in an embodiment of this application;

[0031] Figure 10 This is a schematic diagram of the structure of a magnetic element provided in an embodiment of this application;

[0032] Figure 11 This is a schematic diagram of the internal structure of another magnetic element provided in an embodiment of this application;

[0033] Figure 12This is a three-dimensional structural schematic diagram of another magnetic element provided in an embodiment of this application;

[0034] Figure 13 yes Figure 12 Side view of the magnetic component shown;

[0035] Figure 14 yes Figure 12 A top view of a portion of the structure of the magnetic element shown;

[0036] Figure 15 This is a three-dimensional structural schematic diagram of another magnetic element provided in an embodiment of this application;

[0037] Figure 16 yes Figure 15 Side view of the magnetic component shown;

[0038] Figure 17 yes Figure 15 A top view of a portion of the structure of the magnetic element shown. Detailed Implementation

[0039] 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 only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. Uses of terms such as "first," "second," etc., in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or specifying the number of technical features indicated.

[0041] like Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of an electronic device 100. The electronic device 100 can be a photovoltaic inverter, a vehicle inverter, or other types of inverters, a communication power supply, or an energy storage device, etc. The electronic device 100 may include a power conversion circuit 10 and a magnetic element 20, with the power conversion circuit 10 and the magnetic element 20 electrically connected.

[0042] The power conversion circuit 10 can realize functions such as converting and transmitting electrical energy or transmitting and processing signals within the electronic device 100. The power conversion circuit 10 may include a power supply 11, which provides electrical energy to the power conversion circuit 10. The power conversion circuit 10 can effectively convert the energy input from the power supply 11 into the signal power required by the load. The power supply 11 can be a battery, etc., and this application is not limited thereto. For example, the power conversion circuit 10 can convert the energy from the input DC power supply into the signal power required by the load, such as DC or AC power of another power. The input power and output power of the power conversion circuit in this application are not limited.

[0043] Magnetic element 20 is an important component of the power conversion circuit. In the power conversion circuit 10, magnetic element 20 can function as energy storage or filtering. Magnetic element 20 can be a component that generates an electromotive force using the changing current in the power conversion circuit 10. Magnetic element 20 can be an inductor, for example, a power inductor. Magnetic element 20 mainly consists of windings (which can be composed of at least two interconnected coils). The two ends of the windings are connected to the lead terminals on the power conversion circuit 10, ensuring that the current in the power conversion circuit 10 can flow through the windings. When the windings are powered, a magnetic field is generated between and around the windings. If direct current is applied to the windings of magnetic element 20, the magnetic field lines around the windings remain stable. If alternating current is applied to the windings of magnetic element 20, the magnetic field generated by the windings also changes, thus preventing changes in the current in the alternating current circuit and achieving isolation and filtering of the alternating current signal.

[0044] Figure 1 The positions and dimensions of the structural components and magnetic elements 20 in the power conversion circuit 10 are only schematic representations and can be adjusted as needed. Furthermore, Figure 1 This is merely a schematic diagram illustrating the structure of an electronic device 100; the embodiments of this application do not limit the structure of the electronic device 100.

[0045] like Figure 2 and Figure 3 As shown, Figure 2 This is a three-dimensional structural schematic diagram of a magnetic element 20 provided in an embodiment of this application. Figure 3 yes Figure 2The diagram shows an exploded view of the magnetic element 20. The magnetic element 20 may include a top plate 21, a bottom plate 22, a column 30, a winding 40, a yoke 50, and a magnetically conductive part 60. The top plate 21 and the bottom plate 22 may be spaced apart or arranged in parallel. The column 30 is fixedly connected between the top plate 21 and the bottom plate 22. The top plate 21 and the column 30 can be a single integrated structure, as can the bottom plate 22 and the column 30. Alternatively, the column 30 can be fixedly connected between the top plate 21 and the bottom plate 22 through assembly, such as by adhesive bonding. The top plate 21, the bottom plate 22, and the column 30 may be made of alloy materials or ferrite materials. The materials of the top plate 21, the bottom plate 22, and the column 30 may be the same or different.

[0046] In some embodiments, the number of columns 30 can be one or at least two. When the number of columns 30 is at least two, the at least two columns 30 can be arranged at intervals along the first direction A1, and the outer surface of each column 30 is provided with a winding 40, that is, the number of windings 40 can also be multiple. The multiple columns 30 are fixedly connected between the top plate 21 and the bottom plate 22. Figure 2 and Figure 3 The example described uses two columns 30 and two windings 40. In other embodiments, the number of columns 30 can be one, three, or four, etc.

[0047] In some embodiments, when there are at least two columns 30, each column 30 has a top plate 21 and a bottom plate 22 at opposite ends. The top plate 21 corresponding to at least two columns 30 can be an integral structure, and the bottom plate 22 corresponding to at least two columns 30 can be an integral structure. In other embodiments, the top plate 21 corresponding to at least two columns 30 can be a separate structure, and the bottom plate 22 corresponding to at least two columns 30 can be a separate structure. Multiple top plates 21 can be connected by means of adhesive, screws, or binding, and multiple bottom plates 22 can be connected by means of adhesive, screws, or binding.

[0048] The winding 40 may include at least two interconnected coil layers 41, with a gap 42 between at least partially adjacent coil layers 41. The winding 40 may be wound around the outer surface of the post 30. Exemplarily, the winding 40 may be spirally wound around the outer surface of the post 30, or it may be wound in other ways; this application does not limit this. In the embodiments of this application, adjacent coil layers 41 are interconnected, and multiple turns of wire can be wound to form multiple coil layers 41, with the multiple interconnected coil layers 41 forming the winding 40. The wire may be a metal wire such as copper or aluminum, and the cross-section of the metal wire may be circular or flat, etc. Figure 2 and Figure 3To more clearly illustrate the gaps between the multi-layer coils 41, the connecting portions of the multi-layer coils 41 are not shown. However, the multi-layer coils 41 in this embodiment are interconnected, and this will not be repeated in subsequent embodiments. In this embodiment, a gap 42 is formed between every two adjacent coils 41 of the winding 40. In other embodiments, a gap 42 may also be formed between every two adjacent coils 41 in a portion of the winding 40.

[0049] like Figure 4 and Figure 5 As shown, Figure 4 for Figure 2 The side view of the magnetic element 20 shown. Figure 5 for Figure 2 The top view of a portion of the structure of the magnetic element 20 shown, specifically, Figure 5 for Figure 2 The diagram shows a top view of the magnetic element 20 after the top plate 21 has been removed. When there are two posts 30 and two windings 40, a gap is provided between adjacent windings 40. The posts 30 can be racetrack-shaped structures, with the coil 41 wound around the racetrack-shaped posts 30 to form a hollow racetrack-shaped structure. In other embodiments, the posts 30 can also be elliptical cylinders, cylindrical cylinders, or other cylinders, and the shape of the coil 41 can be consistent with the shape of the posts 30.

[0050] See Figure 2 The yoke 50 can be located on one side of the winding 40, and the yoke 50 can be fixedly connected to the top plate 21 and / or the bottom plate 22. The yoke 50 may include a first end 501 and a second end 502 disposed opposite to each other. The first end 501 can be fixedly connected to the top plate 21, and the second end 502 can be fixedly connected to the bottom plate 22. The number of yokes 50 disposed on the outer side of each winding 40 can be one, two, or three, etc., and this application does not limit this.

[0051] By setting the yoke 50, column 30, top plate 21, yoke 50, and bottom plate 22 to form a carrier for a closed magnetic flux loop, the magnetic flux around the winding 40 can form a closed magnetic flux loop through the column 30, top plate 21, yoke 50, and bottom plate 22. This helps to constrain the magnetic flux around the winding 40, reduce leakage flux, and lower the magnetic flux density of the top plate 21 and bottom plate 22. This solves the problem of permeability attenuation of the top plate 21 and bottom plate 22 under high current, and increases the inductance. The increased inductance of the magnetic element 20 can reduce the number of winding layers of the coil 41. The reduction in the number of coil layers can reduce the height of the column 30, thus achieving miniaturization of the magnetic element 20.

[0052] See Figure 2 and Figure 3The magnetically conductive part 60 can be made of the same material as the column 30, top plate 21, or bottom plate 22, or it can be made of a material with a higher magnetic permeability than the column 30, top plate 21, or bottom plate 22. The material of the magnetically conductive part 60 can be the same as the material of the yoke 50. In other embodiments, the material of the magnetically conductive part 60 can be different from that of the yoke 50.

[0053] The magnetically conductive part 60 can be fixedly connected to the side of the yoke 50 facing the winding 40, or the magnetically conductive part 60 can be fixedly connected to the outer surface of the column 30. When the magnetically conductive part 60 is fixedly connected to the side of the yoke 50 facing the winding 40, the magnetically conductive part 60 can be embedded in the gap 42 between at least partially adjacent layers of coils 41, or the magnetically conductive part 60 can be located on the side of the winding 40 facing the top plate 21 or the bottom plate 22. When the magnetically conductive part 60 is fixedly connected to the outer surface of the column 30, the magnetically conductive part 60 can be embedded in the gap 42 between at least partially adjacent layers of coils 41, or the magnetically conductive part 60 can be located on the side of the winding 40 facing the top plate 21 or the bottom plate 22.

[0054] The number of magnetic conductive parts 60 can be one, two, or three, etc., and this application does not limit the number of magnetic conductive parts 60. Figure 2 and Figure 3 The magnetic element 20 shown is illustrated by taking an example where there are five magnetic conductive parts 60, one of which is located on the side of the winding 40 facing the base plate 22, and the other magnetic conductive parts 60 are embedded in the gap 42 between the coils 41. In other embodiments, the magnetically conductive portion 60 may be embedded in the gap 42 between at least partially adjacent layers of coils 41, with at least one magnetically conductive portion 60 located on the side of the winding 40 facing the top plate 21. Alternatively, the magnetically conductive portion 60 may be embedded in the gap 42 between at least partially adjacent layers of coils 41, but the magnetically conductive portion 60 is not located on the side of the winding 40 facing the top plate 21 or the bottom plate 22. Alternatively, the magnetically conductive portion 60 may be located on the side of the winding 40 facing the top plate 21 or the bottom plate 22 (at least two magnetically conductive portions 60 may be provided on the side of the winding 40 facing the top plate 21, and at least two magnetically conductive portions 60 may be provided on the side of the winding 40 facing the bottom plate 22), but the magnetically conductive portion 60 is not embedded in the gap 42 between at least partially adjacent layers of coils 41 (in this case, no gap may be provided between adjacent layers of coils 41). Furthermore, Figure 2 and Figure 3The magnetic element 20 shown is illustrated with an example where the magnetic conductive part 60 is fixedly connected to the yoke 50. In other embodiments, the magnetic conductive part 60 can be fixed to the column 30, or it can be fixed to either the yoke 50 or the column 30. When there is only one column 30, the outer surface of this column 30 can be provided with the magnetic conductive part 60. When there are at least two columns 30, the outer surfaces of some (at least one) columns 30 can be fixedly connected with the magnetic conductive part 60, while the outer surfaces of other columns 30 can be left unconnected to the magnetic conductive part 60, or all the outer surfaces of the columns 30 can be provided with the magnetic conductive part 60. One, two or more yokes 50 may be provided on the outer periphery of each winding 40. When there is one yoke 50, the yoke 50 is provided with a magnetic part 60. When there are at least two yokes 50, some (at least one) yokes 50 may be fixedly connected to the magnetic part 60, while other yokes 50 may not be fixedly connected to the magnetic part 60, or all yokes 50 may be provided with a magnetic part 60.

[0055] The yoke 50, which is connected to the magnetically conductive part 60, and the column 30 can be arranged along the first direction A1, and are called the first yoke. Figure 2 and Figure 3 (Without a first yoke), or, the yoke 50 connected to the magnetic part 60 can also be arranged with the column 30 along the second direction A2, called the second yoke 52, and the first direction A1 can intersect the second direction A2. A yoke without a magnetic part 60 is called a third yoke. Figure 2 and Figure 3 (No third yoke is provided). One or more yokes 50 with magnetic conductive parts 60 can be provided around each column. A first yoke, a second yoke, or both can be provided. Understandably, when there are multiple columns, the first yoke can be located between adjacent columns 30, or at the edge of the magnetic element 20. In this embodiment, the arrangement direction of the top plate 21 and the bottom plate 22 is taken as the third direction A3. The first direction A1 is perpendicular to the third direction A3, and the second direction A2 is perpendicular to the third direction A3. The first direction A1 can be perpendicular to the second direction A2.

[0056] like Figure 6 As shown, Figure 6 This is a circuit diagram of the leakage flux cutting winding 40 of the magnetic element 20 without a magnetic guide section 60. Figure 6 The generation of leakage flux and the cutting of winding 40 by leakage flux are illustrated using a cross-sectional view of a column 30, a winding 40, a top plate 21, and a bottom plate 22 as an example. Figure 6 The central magnetic flux can form a closed magnetic flux loop through the column 30, the top plate 21, the yoke 50 and the bottom plate 22. Figure 6The arrow loop at point B1 indicates that leakage flux around winding 40 cuts through winding 40. When current flows through winding 40, some flux forms a closed flux loop through column 30, top plate 21, yoke 50, and bottom plate 22, while other flux is exposed to the air, forming leakage flux. This leakage flux reduces the inductance of magnetic element 20, affecting its performance. Without the magnetic guide 60, the presence of leakage flux causes some of it to cut through winding 40, generating an electromotive force. This results in a skin effect on the conductors of winding 40, meaning the current inside winding 40 is concentrated on the surface of the conductors, rather than evenly distributed across the entire cross-sectional area. This reduces the effective cross-sectional area of ​​the conductors, increasing the AC resistivity and consequently increasing the AC losses of winding 40.

[0057] like Figure 7 As shown, Figure 7 This is a schematic diagram of the magnetic flux loop around the winding 40 after the magnetic conductor 60 is installed in the yoke 50. Specifically, Figure 7 yes Figure 2 The magnetic element 20 shown is a cross-sectional view along AA. Figure 7 The following is a schematic diagram illustrating the magnetic flux generation circuit around the winding 40 after the magnetic flux generation circuit is set with the magnetic flux generation circuit 60 after the magnetic flux generation circuit 60 is set, using a cross-sectional view of a column 30, a winding 40, a yoke 50, a magnetic conductor 60, a top plate 21, and a bottom plate 22 as an example. Figure 7 The arrow loop at point B2 indicates that the magnetic flux of winding 40 can form a closed magnetic flux loop through column 30, top plate 21, yoke 50 and bottom plate 22. Figure 7 The arrow loop at point B3 indicates that after the magnetic guide part 60 is installed, it can extend into the gap between adjacent coils 41. The magnetic guide part 60 can be located on the side of winding 40 facing the base plate 22. The magnetic guide part 60 provides a low magnetic resistance path for leakage flux (the magnetic resistance of the magnetic guide part 60 is usually less than that of air). The leakage flux will pass through the magnetic guide part 60, which can confine the leakage flux in the air. The leakage flux around winding 40 can form a magnetic flux loop through the post 30, the magnetic guide part 60, the yoke 50, and another magnetic guide part 60, preventing the leakage flux from cutting winding 40, reducing leakage flux, increasing inductance, reducing the AC resistance of the winding, and reducing the AC loss of winding 40.

[0058] Furthermore, when current flows through the winding 40, the winding 40 generates heat. In this embodiment, when the magnetically conductive part 60 extends between the windings 40, it increases the heat dissipation area, which is beneficial for the heat dissipation of the winding 40. With the magnetically conductive part 60 extending between the windings 40, the heat inside the winding 40 is more easily transferred to the thermally conductive column 30, which dissipates heat through the column 30. The heat inside the winding 40 can also be transferred to the magnetically conductive part 60 (the thermal conductivity of the magnetically conductive part 60 is generally better than that of air) and then to the yoke 50 for heat dissipation, thus enhancing the heat dissipation performance of the magnetic element 20.

[0059] like Figure 8 As shown, Figure 8 This is a schematic diagram of another magnetic element 20. The magnetic conductive part 60 can be fixedly connected to the outer surface of the column 30, and the magnetic conductive part 60 is embedded in the gap 42 between two adjacent layers of coils 41. Figure 8 The arrow loop at point B4 indicates that the magnetic flux of winding 40 can form a closed magnetic flux loop through column 30, top plate 21, yoke 50 and bottom plate 22. Figure 8 The arrow loop at point B5 indicates that after the magnetic guide section 60 is installed, part of the magnetic guide section 60 extends into the gap between adjacent coils 41, while another part of the magnetic guide section 60 can be located on the side of the winding 40 facing the base plate 22. The magnetic guide section 60 provides a low magnetic resistance channel for leakage flux (the magnetic resistance of the magnetic guide section 60 is usually less than that of air), which can confine the leakage flux in the air. By providing the magnetic guide section 60 on the column 30, the leakage flux between the column 30 and the yoke 50 can be reduced, and the leakage flux cutting the winding 40 can be reduced, which is beneficial to reducing the AC resistance of the winding 40, thereby reducing the AC loss of the winding 40.

[0060] See Figure 7 and Figure 8 The magnetic conductive part 60 and the yoke 50 can be an integral structure, or the magnetic conductive part 60 can be an integral structure with the column 30. If the magnetic conductive part 60 and the column 30 or the magnetic conductive part 60 and the yoke 50 are assembled as separate structures, an air gap will exist at the connection, increasing the leakage magnetic flux in the magnetic element 20. By setting the magnetic conductive part 60 and the yoke 50 as an integral structure, or the magnetic conductive part 60 and the column 30 as an integral structure, it is beneficial to avoid increasing the leakage magnetic flux in the overall structure. In other embodiments, as needed, the magnetic conductive part 60 and the column 30 or the magnetic conductive part 60 and the yoke 50 can also be set as separate structures and fixedly connected.

[0061] See Figure 7A gap is provided between the end of the magnetically conductive part 60 away from the yoke 50 and the column 30. In other embodiments, the end of the magnetically conductive part 60 away from the yoke 50 can extend to the column 30, that is, the end of the magnetically conductive part 60 away from the yoke 50 can contact the column 30, which can increase the space occupied by the magnetically conductive part 60, reduce the space occupied by air, reduce the cutting of the winding by leakage flux, and reduce the AC loss of the winding 40.

[0062] See Figure 8 A gap is provided between the end of the magnetically conductive part 60 away from the column 30 and the yoke 50. In other embodiments, the end of the magnetically conductive part 60 away from the column 30 extends to the yoke 50, that is, the end of the magnetically conductive part 60 away from the column 30 can contact the yoke 50, which can increase the space occupied by the magnetically conductive part 60, reduce the space occupied by air, reduce the cutting of the winding by leakage flux, and reduce the AC loss of the winding 40.

[0063] In some embodiments, the column 30, top plate 21, another column 30, and bottom plate 22 can form a carrier for a closed magnetic flux loop. A magnetically conductive part 60 can be provided on the column 30. A gap can be provided between the end of the magnetically conductive part 60 away from the column 30 and the other column 30. The end of the magnetically conductive part 60 away from the column 30 can also extend to the other column 30, that is, the end of the magnetically conductive part 60 away from the column 30 contacts the other column 30. This can increase the space occupied by the magnetically conductive part 60, reduce the space occupied by air, reduce the cutting of the winding 40 by leakage magnetic flux, and reduce the AC loss of the winding 40.

[0064] like Figure 9 , Figure 9 This is a schematic diagram of another type of magnetic element 20. The number of magnetically conductive parts can be at least two. Figure 9 Taking a case with five magnetically conductive parts as an example, the multiple magnetically conductive parts are arranged at intervals along a third direction A3, namely, a first magnetically conductive part 61 and a second magnetically conductive part 62. The first magnetically conductive part 61 can be located on the side of the second magnetically conductive part 62 facing the top plate 21, or it can be located on the side of the second magnetically conductive part 62 facing the bottom plate 22. The number of first magnetically conductive parts 61 can be one, two, or three, etc., and the number of second magnetically conductive parts 62 can be one, two, or three, etc. This application does not limit the number of first magnetically conductive parts 61 and second magnetically conductive parts 62.

[0065] In some embodiments, the dimension L1 of the first magnetically conductive part 61 in the third direction A3 may be greater than the dimension L2 of the second magnetically conductive part 62 in the third direction A3. When the first magnetically conductive part 61 is located on the side of the second magnetically conductive part 62 facing the top plate 21, the first magnetically conductive part 61 is closer to the connection between the top plate 21 and the column 30 than the second magnetically conductive part 62. When the first magnetically conductive part 61 is located on the side of the second magnetically conductive part 62 facing the bottom plate 22, the first magnetically conductive part 61 is closer to the connection between the bottom plate 22 and the column 30 than the second magnetically conductive part 62. Air gaps may exist at the connection between the top plate 21 and the column 30 and the connection between the bottom plate 22 and the column 30. Therefore, the leakage magnetic flux at the connection between the top plate 21 and the column 30 and the connection between the bottom plate 22 and the column 30 is greater than that at other locations. The leakage magnetic flux at the connection between the top plate 21 and the column 30 and the connection between the bottom plate 22 and the column 30 can be constrained by the first magnetic conductive part 61. The first magnetic conductive part 61 is prone to saturation. By setting the size of the first magnetic conductive part 61 in the third direction A3 to be greater than the size of the second magnetic conductive part 62 in the third direction A3, the saturation of the first magnetic conductive part 61 at locations with more leakage magnetic flux can be avoided.

[0066] In other embodiments, the dimension L1 of the first magnetic conductive part 61 in the third direction A3 may be greater than the dimension L2 of the second magnetic conductive part 62 in the third direction A3, which will not be elaborated further below.

[0067] See again Figure 7 The column 30 may include a first segment 31 and a second segment 32 arranged along a third direction A3, and an air gap 33 may be provided between the first segment 31 and the second segment 32.

[0068] The magnetically conductive part 60 corresponding to the air gap 33 (the magnetically conductive part 60 corresponding to the air gap 33 can be understood as the magnetically conductive part 60 near the air gap 33 that can constrain the leakage magnetic flux at the position of the air gap 33, and is not limited to the air gap 33 and the magnetically conductive part 60 being directly corresponding) can have a larger size in the third direction A3 than the size of other magnetically conductive parts 60 in the third direction A3. Figure 7 Taking five magnetic conductive parts 60 as an example, Figure 7 The multiple magnetically conductive parts 60 are substantially equal in size on the third direction A3, but understandably, they can be... Figure 7 The third magnetically conductive part 60 in the direction from the top plate 21 to the bottom plate 22 is designed to have a larger dimension in the third direction A3 than the other four magnetically conductive parts 60 in the third direction A3. Since there is a relatively high leakage magnetic flux near the air gap 33, by setting the dimension of the magnetically conductive part 60 corresponding to the air gap 33 in the third direction A3 to be larger than the dimensions of the other magnetically conductive parts 60 in the third direction A3, saturation of the magnetically conductive parts in locations with high leakage magnetic flux can be avoided.

[0069] In other embodiments, the size of the magnetically conductive part 60 corresponding to the air gap 33 on the third direction A3 can be larger than the size of other magnetically conductive parts 60 on the third direction A3, which will not be elaborated further below.

[0070] In some embodiments, the dimensions of the plurality of magnetic conductive parts 60 in the third direction A3 may be set to be equal. This application does not limit the setting of the dimensions of the plurality of magnetic conductive parts 60, and can adjust them as needed.

[0071] like Figure 10 As shown, Figure 10 This is a schematic diagram of the structure of a magnetic element 20. The magnetic element 20 may include a housing 71 and a colloid ( Figure 10 (Not shown), the top plate 21, bottom plate 22, column 30, and winding 40 are all located inside the outer casing 71. The outer casing 71 has an opening on one side. The colloid can be located between the outer casing 71 and the top plate 21, bottom plate 22, column 30, and winding 40. A gap is provided between the colloid and the yoke 50. The number of columns 30 and windings 40 is not limited; there can be one, two, or three, etc. Figure 10 Taking the column 30 and winding 40 as an example, the outer casing 71 can be a copper, iron, or aluminum casing, or other casings with high thermal conductivity, and the colloid can be a heat-dissipating adhesive, etc., which are not limited in this application. When current is applied, the winding 40 generates heat, which is transferred to the column 30, causing the temperature of the column 30 to rise. This leads to a decrease in the permeability of the column 30, a decrease in the saturation magnetic flux density of the column 30, an increase in leakage flux, and a decrease in inductance. By using the outer casing 71 and the colloid, the temperature of the winding 40 can be transferred to the outer casing 71 through the colloid and dissipated into the surrounding air through the outer casing 71, reducing the temperature of the magnetic element 20 and minimizing the decrease in the inductance of the magnetic element 20. The temperature of the winding 40 increases, which leads to an increase in the temperature of the colloid and an increase in its volume. If the colloid comes into contact with the yoke 50, a large force will be exerted on the yoke 50 when the volume of the colloid increases, causing the connection between the yoke 50 and the top plate 21 and the bottom plate 22 to loosen or break, resulting in structural instability. In this embodiment, a gap is provided between the colloid and the yoke 50 so that the colloid will not squeeze the yoke 50 when it expands due to heat.

[0072] Understandably, in other embodiments, when the number of windings 40 is at least two, the magnetic element 20 may also be provided with a housing 71 and a colloid, and a gap may be provided between the colloid and the yoke 50 to reduce the temperature of the magnetic element 20, reduce the decrease in the inductance of the magnetic element 20, and avoid structural instability of the magnetic element 20. The configuration of the housing 71 and the colloid will not be described again in the following embodiments.

[0073] like Figure 11 As shown, Figure 11This is a schematic diagram of the internal structure of another magnetic element 20. The magnetic element 20 may include a top plate 21, a bottom plate 22, columns 30, windings 40, and a magnetically conductive part 60, but excludes the yoke 50. The magnetically conductive part 60 can be fixedly connected to the outer surface of the columns 30 and is embedded in the gap between the coils 41. The end of the magnetically conductive part 60 facing away from the column 30 faces another column 30. The structure, position, and connection relationship of the top plate 21, bottom plate 22, columns 30, and windings 40 are described in the aforementioned scheme and will not be repeated here. The number of columns 30 can be one, two, or three, and the outer surface of each column 30 can be provided with a winding 40. The magnetic conductive part 60 is fixedly connected to the outer surface of the column 30. This can be understood as follows: when there is one column 30, the outer surface of the column 30 is provided with the magnetic conductive part 60; when there are at least two columns 30, the outer surface of some (at least one) columns 30 can be fixedly connected with the magnetic conductive part 60, while the outer surface of other columns 30 may not be fixedly connected with the magnetic conductive part 60, or the outer surface of all columns 30 may be provided with the magnetic conductive part 60.

[0074] Figure 11 Taking two columns 30 as an example, the two columns 30 are arranged at intervals along the first direction A1, and each column 30 has a winding 40 on its outer surface. The column 30, top plate 21, the other column 30, and bottom plate 22 form a carrier for a closed magnetic flux loop. The magnetic flux around the winding 40 can form a magnetic flux loop through the column 30, top plate 21, the other column 30, and bottom plate 22. By providing a magnetically conductive part 60 on the column 30, the magnetically conductive part 60 provides a low magnetic resistance channel for leakage magnetic flux (the magnetic resistance of the magnetically conductive part 60 is usually less than that of air), which can reduce leakage magnetic flux and increase inductance. The leakage magnetic flux around the winding 40 can form a closed magnetic flux loop through the magnetically conductive part 60, avoiding leakage magnetic flux and cutting the winding 40, thus reducing the AC loss of the winding 40. In addition, in this embodiment, the magnetically conductive part 60 extends between the windings 40, which is beneficial for the heat dissipation of the winding 40.

[0075] See Figure 11 A gap is provided between the end of the magnetically conductive part 60 away from the column 30 and another column 30. In other embodiments, the end of the magnetically conductive part 60 away from the column 30 can extend to the adjacent column 30, that is, the end of the magnetically conductive part 60 away from the column 30 contacts the adjacent column 30. This can increase the space occupied by the magnetically conductive part 60, reduce the space occupied by air, and help reduce the cutting of leakage flux on the winding 40 and reduce AC loss.

[0076] like Figure 12 , Figure 13 and Figure 14 As shown, Figure 12 This is a schematic diagram of the three-dimensional structure of another magnetic element 20. Figure 13 yes Figure 12The side view of the magnetic element 20 shown. Figure 14 yes Figure 12 The top view of a portion of the structure of the magnetic element 20 shown, specifically, Figure 14 yes Figure 12 The diagram shows a top view of the magnetic element 20 after the top plate has been removed. In this embodiment, the number of posts 30 can be at least two, and the at least two posts 30 can be arranged at intervals along the first direction A1. The number of windings 40 is the same as the number of posts 30, and each post 30 has a winding 40 on its outer surface. The number of second yokes 52 is at least two, and each post 30 can be provided with one second yoke 52. Some posts 30 may not have second yokes 52 around them. Figures 12 to 14 Taking an example where there are three columns 30, three windings 40, and three second yokes 52, the following description is provided. In the second direction A2, one column 30 can be correspondingly provided with one second yoke 52. In the first direction, a gap 503 is provided between two adjacent second yokes 52, which is beneficial for heat dissipation of the windings 40 of the magnetic element 20, reducing the attenuation of the magnetic permeability of the column 30, reducing leakage flux, and increasing inductance. In other embodiments, in the first direction A1, at least two second yokes 52 can also be connected into an integral structure.

[0077] See Figure 12 , Figure 13 and Figure 14 In this embodiment, a third yoke 53 may be provided. The number of third yokes 53 may be one, two, or three, etc. This application does not limit the number of third yokes 53. The magnetic conductive part 60 is not provided on the third yoke 53. The third yoke 53 may be located between adjacent posts 30 or at the outermost edge of the magnetic element 20. By providing the third yoke 53, it is beneficial to form more magnetic flux loops to constrain the magnetic flux generated by the winding 40 and increase the inductance.

[0078] In this embodiment of the application, a magnetic conductive part can also be provided on the column 30 to reduce leakage flux and reduce AC loss of winding 40.

[0079] In some embodiments, the number of windings 40 can be at least two, and the number of magnetic flux loops corresponding to each winding 40 is equal. Magnetic flux can form a closed magnetic flux loop through the column, top plate, another column, and bottom plate. Magnetic flux can also form a closed magnetic flux loop through the column, top plate, yoke, and bottom plate. The number and position of the yoke affect the number of magnetic flux loops. The top and bottom plates corresponding to windings 40 with fewer magnetic flux loops have higher magnetic flux density, resulting in severe attenuation of the permeability of the top plate 21 and bottom plate 22, and a reduction in inductance. The number and position of the columns 30 and yokes 50 in the magnetic element 20 can be set as needed to ensure that the number of magnetic flux loops corresponding to each winding 40 is equal. This can reduce the difference in magnetic flux density between the top and bottom plates corresponding to each winding 40, avoid the attenuation of the permeability of the top and bottom plates corresponding to windings 40 with fewer magnetic flux loops, and help reduce the difference in inductance around each winding 40.

[0080] like Figure 15 , Figure 16 and Figure 17 As shown, Figure 15 This is a schematic diagram of the three-dimensional structure of another magnetic element 20. Figure 16 yes Figure 15 The side view of the magnetic element 20 shown. Figure 17 yes Figure 15 The top view of a portion of the structure of the magnetic element 20 shown, specifically, Figure 17 yes Figure 15The diagram shows a top view of the magnetic element 20 after the top plate has been removed. In this embodiment, the number of windings 40 is described as three. There can be three posts, which can be a first post 31, a second post 32, and a third post 33. These posts can be spaced apart along a first direction A1. There can be two third yokes 53, which can be arranged along the first direction A1 with either the first post 31, the second post 32, or the third post 33. The two third yokes 53 can be located between adjacent posts 30 (between the first post 31 and the second post 32, or between the second post and the third post 33). Along the first direction A1, the two posts (the first post 31 and the third post 33) located at opposite ends of the magnetic element 20 are respectively provided with second yokes 52. Second yokes 52 may not be provided around the second post 32. In this embodiment, a third yoke 53 is provided on one side of both the first column 31 and the third column 33. The first column 31, the third yoke 53 on one side, the top plate 21, and the bottom plate 22 form a magnetic flux loop. The third column 33, the third yoke 53 on one side, the top plate 21, and the bottom plate 22 form a magnetic flux loop. The second column 32 has a third yoke 53 on both sides, and the second column 32, the third yoke 53 on both sides, the top plate 21, and the bottom plate 22 form two magnetic flux loops respectively. Compared with the winding wound on the second column 32, the winding wound on the first column 31 and the third column 33 corresponds to fewer magnetic flux loops, resulting in a larger magnetic flux density on the top plate 21 and the bottom plate 22 corresponding to the winding wound on the first column 31 and the third column 33. The permeability of the top plate and the bottom plate corresponding to the first column 31 and the third column 33 is severely attenuated, and the inductance of the magnetic element 20 decreases. By providing the second yoke 52 corresponding to the first post 31 and the third post 33, a magnetic flux loop can be added to the first post 31 and the third post 33. This makes the number of magnetic flux loops corresponding to the three windings 40 around the three posts 30 equal, which can reduce the difference in magnetic flux density between the top plate and the bottom plate corresponding to each winding 40, avoid the attenuation of the magnetic permeability of the top plate and the bottom plate, and help reduce the difference in inductance around each winding 40.

[0081] It is understandable that the first yoke can also be provided on the first column 31 and the third column 33 respectively. In the first direction A1, the first yoke can be located at opposite ends of the magnetic element 20. That is, in the first direction A1, the first yoke can be located on the side of the first column 31 away from the second column 32 and the side of the third column 33 away from the second column 32 respectively.

[0082] In this embodiment of the application, magnetic conductive parts may also be provided on the first column 31, the second column 32 and the third column 33 to reduce leakage flux and reduce AC loss of winding 40.

[0083] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A magnetic element, characterized in that, It includes a top plate, a bottom plate, columns, windings, a yoke, and a magnetic conductive part; The top plate and the bottom plate are spaced apart, and the column is fixedly connected between the top plate and the bottom plate; The wire is wound multiple times to form a multi-layered coil, and the multiple interconnected coils form the winding, which is wound around the outer surface of the column; The yoke is located on one side of the winding and is fixedly connected to the top plate and the bottom plate; The magnetic conductive part is embedded in the gap between at least partially adjacent two layers of the coil, and the magnetic conductive part is also located on the side of the winding facing the top plate or the bottom plate; The yoke includes a second yoke and a third yoke. The second yoke is fixedly connected to the magnetic conductive part on the side facing the winding, and the second yoke and the post are arranged along a second direction; the third yoke and the post are arranged along a first direction. The first direction intersects with the second direction.

2. The magnetic element according to claim 1, characterized in that, The magnetic conductive part and the yoke part are an integral structure.

3. The magnetic element according to claim 1, characterized in that, The magnetic conductive part extends to the column from the end opposite to the yoke.

4. The magnetic element according to any one of claims 1-3, characterized in that, The yoke connecting the magnetic conductive part and the column are arranged along a first direction and constitute the first yoke.

5. The magnetic element according to claim 1, characterized in that, The number of columns is at least two, and the at least two columns are arranged at intervals along the first direction. Each column has a winding on its outer surface. The number of second yokes is at least two, and there is a gap between two adjacent second yokes in the first direction.

6. The magnetic element according to claim 1, characterized in that, The number of columns is at least three, and the at least three columns are arranged at intervals along a first direction. A third yoke is provided between two adjacent columns. In the first direction, the two columns located at opposite ends of the magnetic element are respectively provided with a second yoke. The second yoke connecting the magnetic conductive part is arranged with the columns along a second direction, and the second direction intersects with the first direction.

7. The magnetic element according to claim 1, characterized in that, The number of magnetic conductive parts is at least two, namely a first magnetic conductive part and a second magnetic conductive part arranged at intervals. The first magnetic conductive part is located on the side of the second magnetic conductive part facing the top plate, or the first magnetic conductive part is located on the side of the second magnetic conductive part facing the bottom plate. The size of the first magnetic conductive part in a third direction is greater than the size of the second magnetic conductive part in the third direction. The third direction is the arrangement direction of the top plate and the bottom plate.

8. The magnetic element according to claim 1, characterized in that, The column includes a first section and a second section, with an air gap between the first section and the second section. The magnetic conductive part corresponding to the air gap has a larger dimension in the third direction than the other magnetic conductive parts in the third direction. The third direction is the arrangement direction of the top plate and the bottom plate.

9. The magnetic element according to any one of claims 1-3 and 5-8, characterized in that, The magnetic component includes a housing and a colloid. The top plate, the bottom plate, the column, and the winding are all located inside the housing. The colloid is located between the housing and the top plate, the bottom plate, the column, and the winding. A gap is provided between the colloid and the yoke.

10. The magnetic element according to claim 4, characterized in that, The magnetic component includes a housing and a colloid. The top plate, the bottom plate, the column, and the winding are all located inside the housing. The colloid is located between the housing and the top plate, the bottom plate, the column, and the winding. A gap is provided between the colloid and the yoke.

11. An electronic device, characterized in that, It includes a power conversion circuit and a magnetic element as described in any one of claims 1-9, wherein the magnetic element is electrically connected to the power conversion circuit.

Images