CN116190067A - Magnetic element and electronic device - Google Patents

Abstract

The embodiment of the application provides a magnetic element and electronic equipment. The magnetic element comprises a top plate, a bottom plate, an upright post, a winding and a magnetic conduction part; the top plate and the bottom plate are arranged at intervals, and the upright posts are fixedly connected with the top plate and the bottom plate; the winding comprises at least coils which are connected with each other, and the winding is wound on the outer surface of the upright post; or, the magnetic element may further include a yoke portion, the yoke portion is fixedly connected to the top plate and/or the bottom plate, the magnetic conductive portion is fixedly connected to an outer surface of the upright post or the yoke portion, and the magnetic conductive portion is embedded in a gap between at least two adjacent layers of coils or the magnetic conductive portion is located at a side of the winding facing the top plate or the bottom plate. According to the embodiment of the application, the magnetic conduction part is arranged, so that the leakage flux of the magnetic element can be reduced.

Description

Magnetic element and electronic device

Technical Field

The present disclosure relates to the field of magnetic assemblies, and more particularly, to a magnetic element and an electronic device.

Background

Some electronic devices are provided with magnetic elements which can play roles in energy storage, filtering and the like, and are important elements capable of ensuring stable and safe operation of the electronic devices.

When the magnetic element is operated, magnetic flux is usually leaked into the air, and a leakage flux phenomenon is formed, so that the inductance of the magnetic element is reduced. The current flowing into the winding is increased, and the leakage magnetic flux phenomenon is also aggravated, so that the inductance is obviously reduced.

Therefore, it is necessary to provide a magnetic element capable of solving the problem of leakage flux of the magnetic element.

Disclosure of Invention

The embodiment of the application provides a magnetic element and electronic equipment, and the magnetic element can be applied to the electronic equipment, so that the problem of magnetic flux leakage of the magnetic element can be solved, and the alternating current loss in the magnetic element can be reduced.

In a first aspect, embodiments of the present application provide a magnetic element, including a top plate, a bottom plate, a post, a winding, and a magnetically permeable portion; the top plate and the bottom plate are arranged at intervals, and the upright posts are fixedly connected between the top plate and the bottom plate; the winding comprises at least two layers of coils which are connected with each other, and the winding is wound on the outer surface of the upright post; the magnetic conduction portion is fixedly connected to the outer surface of the upright post, and the magnetic conduction portion is embedded into a gap between at least two adjacent layers of coils, or is positioned on one side of the winding, facing the top plate or the bottom plate. The number of the stand columns can be one, two or three, and the like, and the outer surface of each stand column can be provided with windings. The magnetic conduction portion is fixedly connected to the outer surface of the upright post, when the number of the upright posts is one, the magnetic conduction portion is arranged on the outer surface of the upright post, when the number of the upright posts is at least two, the magnetic conduction portion can be fixedly connected to the outer surface of some (at least one) upright posts, the magnetic conduction portion can be not fixedly connected to the outer surface of other upright posts, or the magnetic conduction portions can be arranged on the outer surfaces of all upright posts. The number of the magnetic conductive parts on the outer surface of the upright post can be one, two or three, and the like, and the magnetic conductive parts can be embedded into gaps between at least part of two adjacent layers of coils and are not positioned on one side of the winding, which faces the top plate or the bottom plate; alternatively, some of the magnetically permeable portions may be embedded in the gaps between adjacent coils, and other magnetically permeable portions may be located on the side of the winding facing the top or bottom plate; alternatively, the magnetically permeable portion may be located on a side of the winding facing the top or bottom plate without being embedded in the gap between adjacent coils. The magnetic conduction portion is embedded into the gap between at least two adjacent layers of coils, which is understood to mean that the gap can be arranged between two adjacent layers of coils, the gap can be not arranged between two adjacent layers of coils, or the gap can be arranged between any two adjacent layers of coils, and the magnetic conduction portion is embedded into at least one gap.

According to the embodiment of the application, the magnetic conduction part is arranged on the upright post, so that leakage magnetic flux can be reduced, inductance is increased, and the alternating current loss of the winding can be reduced. Specifically, the magnetic conduction portions are arranged on the upright posts, extend into gaps between adjacent coils or are located on one side of the winding, facing the top plate or the bottom plate, of the magnetic conduction portions, the magnetic conduction portions provide a low-magnetic-resistance channel for leakage magnetic fluxes (the magnetic resistance of the magnetic conduction portions is usually smaller than that of air), the leakage magnetic fluxes pass through the magnetic conduction portions, the leakage magnetic fluxes in the air can be restrained, the magnetic fluxes leaked into the air can be reduced, the inductance is increased, and the performance of the magnetic element is improved. The magnetic flux (namely, leakage magnetic flux) partially leaked in the air can cut the winding, electromotive force is generated on the winding, so that the alternating current resistance coefficient of the winding can be increased, the alternating current loss of the winding is increased, a channel with low magnetic resistance can be provided for the leakage magnetic flux through the magnetic conduction part arranged on the upright post, the leakage magnetic flux does not cut the winding any more, and the alternating current resistance coefficient of the winding is reduced, so that the alternating current loss of the winding can be reduced. In addition, when the magnetic conduction part stretches into between the windings, the heat dissipation area can be increased, and the heat energy of the windings can be dissipated through the upright posts and the magnetic conduction part, so that the heat dissipation of the windings is facilitated.

In a possible implementation manner, the number of the stand columns is at least two, at least two stand columns are arranged at intervals along the first direction, the outer surface of each stand column is provided with the winding, at least one stand column is provided with the magnetic conduction part, and one end of the magnetic conduction part, which is away from the stand column, extends to the adjacent other stand column. The posts, top plate, another adjacent post and bottom plate may form a carrier of a closed flux loop for the flux of the windings to pass through, forming a flux loop that may confine the flux around each winding, but there may still be leakage flux around the windings. One end of the magnetic conduction portion is connected with one stand column, the other end of the magnetic conduction portion is connected with the other stand column, and leakage magnetic flux does not pass through air when passing through carriers of magnetic flux loops of the stand column, the magnetic conduction portion, the other stand column and the other magnetic conduction portion, so that leakage magnetic flux is reduced. In other embodiments, a gap may exist between one end of the magnetic conductive portion facing away from the upright post and another upright post, that is, the magnetic conductive portion does not extend to the other upright post, which is not limited in this application.

In a second aspect, embodiments of the present application provide a magnetic element, including a top plate, a bottom plate, a column, a winding, a yoke, and a magnetically permeable portion; the top plate and the bottom plate are arranged at intervals, and the upright posts are fixedly connected between the top plate and the bottom plate; the winding comprises at least two layers of coils which are connected with each other, and the winding is wound on the outer surface of the upright post; the yoke is located at one side of the winding and is fixedly connected to the top plate and/or the bottom plate. The magnetic conduction part is fixedly connected to the outer surface of the upright post, or is fixedly connected to one side of the yoke part, which faces the winding; the magnetic conduction part is embedded in a gap between at least two adjacent layers of coils, or is positioned on one side of the winding facing the top plate or the bottom plate. The quantity of stand can be one, two or three etc., and the surface of every stand all can set up the winding, magnetic conduction portion fixed connection in the surface of stand can understand: when the number of the stand columns is one, the outer surfaces of the stand columns can be provided with magnetic conduction parts, when the number of the stand columns is at least two, the outer surfaces of some (at least one) stand columns can be fixedly connected with the magnetic conduction parts, the outer surfaces of other stand columns can be not fixedly connected with the magnetic conduction parts, or the magnetic conduction parts can be arranged on the outer surfaces of all the stand columns. The outer circumference of each winding may be provided with one, two or more yokes, and the magnetic conductive part is fixedly connected to the side of the yoke facing the winding may be understood as: when the number of the yokes is one, the yokes are provided with magnetic conduction parts, and when the number of the yokes is at least two, some (at least one) yokes can be fixedly connected with the magnetic conduction parts, and other yokes can be not fixedly connected with the magnetic conduction parts, or all yokes can be provided with the magnetic conduction parts. The number of the magnetic conductive parts on the outer surface of the upright post or the yoke part can be one, two or three, and the like, and the magnetic conductive parts can be embedded into gaps between at least part of two adjacent layers of coils and are not positioned on one side of the winding, which faces the top plate or the bottom plate; alternatively, some of the magnetically permeable portions may be embedded in the gaps between adjacent coils, and other magnetically permeable portions may be located on the side of the winding facing the top or bottom plate; alternatively, the magnetically permeable portion may be located on a side of the winding facing the top or bottom plate without being embedded in the gap between adjacent coils.

According to the embodiment of the application, the yoke part can be arranged, the upright post, the top plate, the yoke part and the bottom plate can form a carrier of a closed magnetic flux loop, and the magnetic flux around the winding is restrained. Through setting up magnetic conduction portion on stand or yoke, magnetic conduction portion stretches into the clearance between the adjacent coil or magnetic conduction portion is located the winding and faces one side of roof or bottom plate, and magnetic conduction portion provides a low reluctance's passageway (magnetic resistance of magnetic conduction portion is usually less than the magnetic resistance of air) for the magnetic leakage flux, and the magnetic leakage flux can pass through magnetic conduction portion, can retrain the magnetic leakage flux in the air, reduces the magnetic flux that leaks in the air, increases inductance value. By providing the magnetic conduction portion on the column or yoke, the leakage flux can be reduced to cut the winding, and the coefficient of the ac resistance of the winding can be reduced, so that the ac loss of the winding can be reduced. In addition, when the magnetic conduction part stretches into between the windings, the heat dissipation area can be increased, and the heat energy of the windings can be dissipated through the upright posts and the magnetic conduction part, so that the heat dissipation of the windings can be facilitated.

In one possible embodiment, the magnetic conductive portion and the upright are in an integral structure, or the magnetic conductive portion and the yoke are in an integral structure. It can be appreciated that if the magnetic conductive portion and the upright post or the magnetic conductive portion and the yoke are assembled in a split structure, an air gap exists in the joint, so as to increase the leakage flux in the magnetic element.

In a possible implementation manner, one end of the magnetic conduction portion, which faces away from the upright, extends to another adjacent upright, or one end of the magnetic conduction portion, which faces away from the upright, extends to the yoke, or one end of the magnetic conduction portion, which faces away from the yoke, extends to the upright. Through setting up magnetic conduction portion and extending to contact with stand or yoke, the one end of magnetic conduction portion is connected to stand or yoke, and the other end of magnetic conduction portion extends to another stand or yoke that can form magnetic flux circuit, can increase the occupation space of magnetic conduction portion, avoids magnetic flux to pass through the air.

In one possible embodiment, the yoke connecting the magnetic conductive portion and the pillar are arranged in a first direction and are first yokes, or the yoke connecting the magnetic conductive portion and the pillar are arranged in a second direction and are second yokes, and the first direction intersects the second direction. One or more yokes provided with magnetic conduction parts can be correspondingly arranged around each upright post so as to restrict magnetic flux around the winding and reduce the alternating current loss of the winding. It will be appreciated that the number of the columns may be one, the number of the columns may be plural, and when the number of the columns is plural, the plurality of columns may be arranged in the first direction, the first yoke may be located between adjacent columns, and the first yoke may be located at an edge position of the magnetic element. According to the embodiment of the application, the yoke parts can be arranged in the first direction and the second direction, so that magnetic flux around the winding is effectively restrained, and the alternating current loss of the winding is reduced.

In a possible implementation manner, the number of the upright posts is at least two, at least two upright posts are arranged at intervals along the first direction, the winding is arranged on the outer surface of each upright post, the number of the second yoke parts is at least two, and a gap is arranged between two adjacent second yoke parts in the first direction. It will be appreciated that the second yoke may not be provided around some of the posts. Through setting up in first direction, there is the clearance between the adjacent second yoke portion, can be favorable to carrying out the heat dissipation to the winding, avoid the temperature of winding to rise, make the temperature of stand rise, the permeability of stand descends, leads to inductance to descend.

In a possible embodiment, the number of windings is at least two, and the number of magnetic flux loops corresponding to each winding is equal. By arranging the magnetic flux loops corresponding to each winding to be equal, the difference of magnetic flux densities of the top plate and the bottom plate corresponding to each winding can be reduced, and the attenuation of magnetic permeability of the top plate, the bottom plate and the upright post corresponding to the windings with less magnetic flux loops can be avoided.

In a possible implementation manner, the number of the stand columns is at least three, at least three stand columns are arranged at intervals along a first direction, a third yoke portion is arranged between every two adjacent stand columns, a gap is arranged between the third yoke portion and the magnetic conduction portion, the two stand columns located at two opposite ends of the magnetic element in the first direction are correspondingly provided with the second yoke portions, the second yoke portions connected with the magnetic conduction portion and the stand columns are arranged along a second direction, and the second direction intersects with the first direction. The gap between the third yoke portion and the magnetic conductive portion may be understood as not providing the magnetic conductive portion on the third yoke portion. According to the embodiment of the application, the second yoke parts are correspondingly arranged on the two stand columns located at the two opposite ends of the magnetic element, so that the magnetic flux loops corresponding to the windings wound by each stand column are equal, and the difference of inductance values of the stand columns is reduced.

In one possible implementation manner, the number of the magnetic conductive parts is at least two, and the magnetic conductive parts are a first magnetic conductive part and a second magnetic conductive part which are arranged at intervals respectively, wherein the first magnetic conductive part is positioned on one side of the second magnetic conductive part towards the top plate, or the first magnetic conductive part is positioned on one side of the second magnetic conductive part towards the bottom plate, the size of the first magnetic conductive part in a third direction is larger than the size of the second magnetic conductive part in the third direction, and the third direction is the arrangement direction of the top plate and the bottom plate. It can be appreciated that in the embodiment of the present application, the first magnetic conductive portion may be correspondingly disposed at the connection portion between the top plate and the upright post, and the first magnetic conductive portion is correspondingly disposed at the connection portion between the bottom plate and the upright post. The number of the first magnetic conductive parts can be one, two or three, etc., and the number of the second magnetic conductive parts can be one, two or three, etc., and the number of the first magnetic conductive parts and the number of the second magnetic conductive parts are not limited in the application. The air gaps may exist at the connection position of the top plate and the upright post and the connection position of the bottom plate and the upright post, so that the leakage magnetic flux at the connection position of the top plate and the upright post and the connection position of the bottom plate and the upright post is more than that at other positions, and the saturation of the magnetic conduction part at the position with more leakage magnetic flux can be avoided by setting the size of the first magnetic conduction part in the third direction to be larger than that of the second magnetic conduction part in the third direction.

In a possible implementation manner, the upright post comprises a first section and a second section, an air gap is arranged between the first section and the second section, the size of the magnetic conduction part corresponding to the air gap in the third direction is larger than the sizes of the other magnetic conduction parts in the third direction, and the third direction is the arrangement direction of the top plate and the bottom plate. The amount of leakage magnetic flux at the air gap can be increased, and the magnetic conduction parts at the positions with more leakage magnetic flux can be prevented from being saturated by arranging the corresponding magnetic conduction parts at the air gap to be larger than the other magnetic conduction parts in the third direction.

In a possible implementation manner, the magnetic element includes a housing and a colloid, the top plate, the bottom plate, the upright post and the winding are all located in the housing, the colloid is located between the housing and the top plate, the bottom plate, the upright post and the winding, and a gap is formed between the colloid and the yoke. The outer shell may be an iron shell or an aluminum shell, and the colloid may be a heat-dissipating adhesive, which is not limited in this application. Through setting up shell and colloid, the heat of winding can be gone out through shell and colloid conduction, can reduce the inductance value decline of magnetic element because of the temperature rise of winding and center pillar. The temperature of winding rises, can lead to the temperature of colloid to rise, and the volume of colloid can increase, if colloid and yoke contact, can have great force to act on yoke when colloid volume increases, leads to yoke and roof, bottom plate's connection not hard up or disconnection, and the structure is unstable, and in this application embodiment, is equipped with the clearance between colloid and the yoke, and like this colloid when being heated and expanded, can not extrude yoke.

In a third aspect, embodiments of the present application provide an electronic device including a power conversion circuit and a magnetic element as described in any one of the above, the magnetic element being electrically connected to the power conversion circuit. The power conversion circuit can effectively convert input energy into signal power required by a load, the magnetic element can play roles in energy storage, filtering and the like in the power conversion circuit, the magnetic element can be an element which generates electromotive force by utilizing current changed in the power conversion circuit, and the magnetic element can be a power inductor and the like. The electronic device may be an inverter, a communication power source, or an energy storage device.

Drawings

The drawings used in the embodiments of the present application are described below.

Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present application;

FIG. 2 is a schematic perspective view of a magnetic element according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of an exploded construction of the magnetic element shown in FIG. 2;

FIG. 4 is a side view of the magnetic element shown in FIG. 2;

FIG. 5 is a top view of a portion of the structure of the magnetic element shown in FIG. 2;

FIG. 6 is a schematic circuit diagram of a leakage flux cut winding of a magnetic element without a magnetically permeable portion;

fig. 7 is a schematic view of a magnetic flux circuit around the winding after the yoke is provided with a magnetically permeable portion;

FIG. 8 is a schematic diagram of another magnetic component provided in an embodiment of the present application;

FIG. 9 is a schematic diagram of another magnetic component provided in an embodiment of the present application;

FIG. 10 is a schematic structural view of a magnetic component according to an embodiment of the present application;

FIG. 11 is a schematic illustration of the internal structure of another magnetic element provided in an embodiment of the present application;

FIG. 12 is a schematic perspective view of another magnetic element according to an embodiment of the present disclosure;

FIG. 13 is a side view of the magnetic element shown in FIG. 12;

FIG. 14 is a top view of a portion of the structure of the magnetic element shown in FIG. 12;

FIG. 15 is a schematic perspective view of another magnetic element according to an embodiment of the present disclosure;

FIG. 16 is a side view of the magnetic element shown in FIG. 15;

fig. 17 is a top view of a portion of the structure of the magnetic element shown in fig. 15.

Detailed Description

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

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 belongs. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items. The description herein as relating to "first," "second," etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance thereof or implicitly indicating the number of technical features indicated.

As shown in fig. 1, fig. 1 is a schematic structural diagram of an electronic device 100. The electronic device 100 may be a photovoltaic inverter, a vehicle-mounted inverter, or other type of inverter, a communication power source, an energy storage device, and the like. The electronic device 100 may include a power conversion circuit 10 and a magnetic element 20, the power conversion circuit 10 being electrically connected to the magnetic element 20.

The power conversion circuit 10 can perform functions such as converting and transmitting electric energy or transmitting and processing signals in the electronic device 100. The power conversion circuit 10 may include a power source 11, the power source 11 may provide power to the power conversion circuit 10, and the power conversion circuit 10 may efficiently convert energy input from the power source 11 into signal power required by a load. The power source 11 may be a battery or the like, and is not limited in this application. For example, the power conversion circuit 10 may convert the energy of the input dc power supply into the signal power required by the load, such as dc power or ac power of another power, and the input power and the output power of the power conversion circuit are not limited.

The magnetic element 20 is an important component of the power conversion circuit, the magnetic element 20 may play a role of energy storage, filtering, etc. in the power conversion circuit 10, the magnetic element 20 may be an element generating electromotive force by using a current varying in the power conversion circuit 10, the magnetic element 20 may be an inductor, etc., and the magnetic element 20 may be a power inductor, for example. The magnetic element 20 is mainly composed of windings (the windings may be composed of at least two layers of coils connected with each other), and two ends of the windings are respectively connected with lead terminals on the power conversion circuit 10, so as to ensure that current of the power conversion circuit 10 can flow through the windings, and after the windings are powered, magnetic fields can be generated between and around the windings. If direct current is supplied to the windings of the magnetic element 20, magnetic force lines around the windings are stable and unchanged, and if alternating current is supplied to the windings of the magnetic element 20, a magnetic field generated by the windings is changed, so that the change of current in an alternating current circuit is prevented, and the effects of isolating, filtering and the like on alternating current signals are achieved.

The location and dimensions of the structural components of the power conversion circuit 10 and the magnetic element 20 in fig. 1 are merely schematic representations that can be adjusted as desired. In addition, fig. 1 is a schematic diagram schematically illustrating a structure of an electronic device 100, and the structure of the electronic device 100 is not limited in the embodiment of the present application.

As shown in fig. 2 and 3, fig. 2 is a schematic perspective view of a magnetic element 20 according to an embodiment of the present application, and fig. 3 is a schematic exploded view of the magnetic element 20 shown in fig. 2. The magnetic element 20 may include a top plate 21, a bottom plate 22, a post 30, windings 40, a yoke 50, and a magnetically permeable portion 60. The top plate 21 and the bottom plate 22 may be disposed at intervals, and the top plate 21 and the bottom plate 22 may be disposed in parallel. The upright 30 is fixedly connected between the top plate 21 and the bottom plate 22, the top plate 21 and the upright 30 may be in an integral structure, the bottom plate 22 and the upright 30 may be in an integral structure, or the upright 30 may be fixedly connected between the top plate 21 and the bottom plate 22 by assembling, for example, by gluing. The top plate 21, the bottom plate 22 and the column 30 may be made of an alloy-like material or a ferrite-like material. The materials of the top plate 21, the bottom plate 22 and the column 30 may be the same or different.

In some embodiments, the number of posts 30 may be one or at least two. When the number of the upright posts 30 is at least two, the at least two upright posts 30 may be arranged at intervals along the first direction A1, and the outer surface of each upright post 30 is provided with the winding 40, that is, the number of the windings 40 may be plural. The plurality of columns 30 are fixedly connected between the top plate 21 and the bottom plate 22. Fig. 2 and 3 illustrate an example in which the number of posts 30 is two and the number of windings 40 is two. In other embodiments, the number of posts 30 may be one, three, four, or the like.

In some embodiments, where the number of columns 30 is at least two, opposite ends of each column 30 are provided with a top plate 21 and a bottom plate 22, respectively. The top plates 21 corresponding to at least two of the columns 30 may be of an integral structure, and the bottom plates 22 corresponding to at least two of the columns 30 may be of an integral structure. In other embodiments, the top plates 21 corresponding to the at least two columns 30 may be in a split structure, the bottom plates 22 corresponding to the at least two columns 30 may be in a split structure, the plurality of top plates 21 may be connected by gluing, screwing or binding, and the plurality of bottom plates 22 may be connected by gluing, screwing or binding, and the like.

The winding 40 may include at least two layers of coils 41 connected to each other, and a gap 42 is provided between at least some adjacent two layers of coils 41, and the winding 40 may be wound around the outer surface of the post 30. For example, the winding 40 may be spirally wound around the outer surface of the post 30, and the winding 40 may be wound around the post 30 in other manners, which are not limited in this application. In this embodiment, two adjacent layers of coils 41 are connected to each other, and the wires may be wound for a plurality of turns to form a multi-layer coil 41, and the multi-layer coil 41 connected to each other forms a 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. In fig. 2 and 3, for more clearly showing the gaps between the multilayer coils 41, the connection portions of the multilayer coils 41 are not shown, but the multilayer coils 41 in the embodiment of the present application are connected to each other, and further description is omitted in other embodiments. In the embodiment of the present application, the gap 42 is formed between the coils 41 of each two adjacent windings 40, and in other embodiments, the gap 42 may be formed between each two adjacent coils 41 of the partial windings 40.

As shown in fig. 4 and 5, fig. 4 is a side view of the magnetic element 20 shown in fig. 2, fig. 5 is a top view of a part of the structure of the magnetic element 20 shown in fig. 2, and in particular, fig. 5 is a top view of the magnetic element 20 shown in fig. 2 after the top plate 21 is removed. When the number of the columns 30 is two and the number of the windings 40 is two, a gap is provided between adjacent windings 40. The upright 30 may be a racetrack type structure, and the coil 41 is wound around the racetrack type upright 30 to form a hollow racetrack type structure. In other embodiments, the post 30 may be an elliptical cylinder, a cylindrical body, or other cylinder, and the shape of the coil 41 may be consistent with the shape of the post 30.

Referring to fig. 2, the yoke 50 may be located at one side of the winding 40, and the yoke 50 may 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 one another, the first end 501 may be fixedly coupled to the top plate 21, and the second end 502 may be fixedly coupled to the bottom plate 22. The number of the yokes 50 provided outside each winding 40 may be one, two, three, or the like, which is not limited in this application.

By providing the yoke 50, the upright post 30, the top plate 21, the yoke 50 and the bottom plate 22 form a carrier of a closed magnetic flux loop, and magnetic fluxes around the winding 40 can form a closed magnetic flux loop through the upright post 30, the top plate 21, the yoke 50 and the bottom plate 22, thereby being beneficial to restraining magnetic fluxes around the winding 40, reducing leakage magnetic fluxes, reducing magnetic flux densities of the top plate 21 and the bottom plate 22, solving the problem of magnetic permeability attenuation of the top plate 21 and the bottom plate 22 under high current, and improving inductance. The inductance of the magnetic element 20 is increased, the number of layers of windings of the coil 41 can be reduced, the height of the pillar 30 can be reduced by reducing the number of layers of the coil 41, and the magnetic element 20 can be miniaturized.

Referring to fig. 2 and 3, the magnetic conductive portion 60 may be made of the same material as the upright post 30 or the top plate 21, or the bottom plate 22, or the magnetic conductive portion 60 may be made of a material having a higher magnetic permeability than the upright post 30, the top plate 21, or the bottom plate 22. The material of the magnetic conductive portion 60 may be the same as that of the yoke portion 50. In other embodiments, the material of the magnetic conductive portion 60 may be different from the yoke portion 50.

The magnetically permeable portion 60 may be fixedly coupled to a side of the yoke 50 facing the winding 40, or the magnetically permeable portion 60 may be fixedly coupled to an outer surface of the post 30. When the magnetically permeable portion 60 is fixedly connected to a side of the yoke portion 50 facing the winding 40, the magnetically permeable portion 60 may be embedded in the gap 42 between at least a portion of the adjacent two layers of coils 41, or the magnetically permeable portion 60 may be located on a side of the winding 40 facing the top plate 21 or the bottom plate 22. The magnetically permeable portion 60 may be inserted into the gap 42 between at least some of the adjacent two layers of coils 41 when the magnetically permeable portion 60 is fixedly attached to the outer surface of the post 30, or the magnetically permeable portion 60 may be located on a side of the winding 40 facing the top plate 21 or the bottom plate 22.

The number of the magnetic conductive portions 60 may be one, two, three, or the like, and the number of the magnetic conductive portions 60 is not limited in the present application. The magnetic element 20 shown in fig. 2 and 3 is described by taking as an example the number of the magnetic conductive portions 60, wherein one of the magnetic conductive portions 60 is located on the side of the winding 40 facing the bottom plate 22, and the other magnetic conductive portions 60 are embedded in the gap 42 between the coils 41. In other embodiments, the magnetic conductive portion 60 may be embedded in the gap 42 between at least two adjacent layers of coils 41, at least one magnetic conductive portion 60 is located on a side of the winding 40 facing the top plate 21, or the magnetic conductive portion 60 may be embedded in the gap 42 between at least two adjacent layers of coils 41, the magnetic conductive portion 60 is not located on a side of the winding 40 facing the top plate 21 or the bottom plate 22, or the magnetic conductive portion 60 is located on a side of the winding 40 facing the top plate 21 or the bottom plate 22 (the magnetic conductive portion 60 on a side of the winding 40 facing the top plate 21 may be at least two, the magnetic conductive portion 60 on a side of the winding 40 facing the bottom plate 22 may be at least two), and the magnetic conductive portion 60 is not embedded in the gap 42 between at least two adjacent layers of coils 41 (in this case, the gap may not be located between adjacent layers of coils 41). In addition, the magnetic element 20 shown in fig. 2 and 3 is described by taking the example that the magnetic conductive portion 60 is fixedly connected to the yoke portion 50, and in other embodiments, the magnetic conductive portion 60 may be fixed to the upright 30, or the magnetic conductive portion 60 may be fixed to the yoke portion 50 or the upright 30. When the number of the upright posts 30 is one, the outer surfaces of the upright posts 30 can be provided with the magnetic conductive parts 60, when the number of the upright posts 30 is at least two, the outer surfaces of some (at least one) upright posts 30 can be fixedly connected with the magnetic conductive parts 60, the outer surfaces of other upright posts 30 can also be not fixedly connected with the magnetic conductive parts 60, or the outer surfaces of all the upright posts 30 can also be provided with the magnetic conductive parts 60. One, two or more yokes 50 may be disposed on the outer periphery of each winding 40, and when the number of yokes 50 is one, the yokes 50 are provided with magnetic conductive portions 60, and when the number of yokes 50 is at least two, some (at least one) yokes 50 may be fixedly connected with magnetic conductive portions 60, other yokes 50 may not be fixedly connected with magnetic conductive portions 60, or all yokes 50 may be provided with magnetic conductive portions 60.

The yoke 50 to which the magnetically conductive portion 60 is connected and the column 30 may be aligned in a first direction A1, which is referred to as a first yoke (the first yoke is not provided in fig. 2 and 3), or the yoke 50 to which the magnetically conductive portion 60 is connected and the column 30 may be aligned in a second direction A2, which is referred to as a second yoke 52, and the first direction A1 may intersect the second direction A2. The yoke portion where the magnetic conductive portion 60 is not provided is referred to as a third yoke portion (the third yoke portion is not provided in fig. 2 and 3). One or more yokes 50 with magnetic conductors 60 may be disposed around each column, and a first yoke, a second yoke, or both may be disposed. It will be appreciated that when the number of posts is plural, the first yoke may be located between adjacent posts 30, or the first yoke may be located at an edge of the magnetic element 20. In this embodiment, the arrangement direction of the top plate 21 and the bottom plate 22 is the third direction A3, the first direction A1 is perpendicular to the third direction A3, the second direction A2 is perpendicular to the third direction A3, and the first direction A1 may be perpendicular to the second direction A2.

As shown in fig. 6, fig. 6 is a schematic circuit diagram of the leakage flux cut winding 40 of the magnetic element 20 in which the magnetic conductive portion 60 is not provided. Fig. 6 illustrates the generation of leakage magnetic flux and the cutting of the winding 40 by the leakage magnetic flux by taking a sectional view of one column 30, one winding 40, the top plate 21, and the bottom plate 22 as an example. In fig. 6, the magnetic flux may form a closed magnetic flux circuit through the upright 30, the top plate 21, the yoke 50 and the bottom plate 22. The arrow loop at B1 in fig. 6 indicates that leakage flux existing around the winding 40 cuts the winding 40. When current is applied to the winding 40, a part of the magnetic flux passes through the column 30, the top plate 21, the yoke 50, and the bottom plate 22 to form a closed magnetic flux circuit, and the other part of the magnetic flux is exposed to air to form a leakage magnetic flux, which causes a decrease in inductance of the magnetic element 20 and affects performance of the magnetic element 20. When the magnetic conductive portion 60 is not provided, part of the leakage magnetic flux may cut the winding 40 due to the existence of the leakage magnetic flux, and electromotive force is generated on the winding 40, so that a skin effect is generated on the wires of the winding 40, that is, the current inside the winding 40 is concentrated on the surface of the wires of the winding 40 and is not uniformly distributed in the cross-sectional area of the wires of the whole winding 40, so that the equivalent cross-sectional area of the wires of the winding 40 is reduced, and the corresponding ac resistivity is increased, thereby increasing the ac loss of the winding 40.

As shown in fig. 7, fig. 7 is a schematic view of a magnetic flux circuit around the winding 40 after the yoke 50 is provided with the magnetic conductive portion 60, and specifically, fig. 7 is a sectional view of the magnetic element 20 shown in fig. 2 taken along A-A. Fig. 7 is a schematic diagram illustrating a magnetic flux generation circuit around the winding 40 after the magnetic conductive portion 60 is provided, by taking a cross-sectional view of one column 30, one winding 40, one yoke 50, the magnetic conductive portion 60, the top plate 21, and the bottom plate 22 as an example. The arrow loop at B2 in fig. 7 indicates that the magnetic flux of the winding 40 may form a closed magnetic flux loop through the upright 30, the top plate 21, the yoke 50 and the bottom plate 22, and the arrow loop at B3 in fig. 7 indicates that after the magnetic conducting portion 60 is disposed, the magnetic conducting portion 60 may extend into the gap between the adjacent coils 41, the magnetic conducting portion 60 may be located on the side of the winding 40 facing the bottom plate 22, the magnetic conducting portion 60 provides a low reluctance path for the leakage magnetic flux (the reluctance of the magnetic conducting portion 60 is generally smaller than the reluctance of air), the leakage magnetic flux may pass through the magnetic conducting portion 60, and the magnetic conducting portion 60 may restrain the leakage magnetic flux in the air. The leakage magnetic flux around the winding 40 can form a magnetic flux loop through the upright post 30, the magnetic conduction part 60, the yoke part 50 and the other magnetic conduction part 60, so that the leakage magnetic flux is prevented from cutting the winding 40, the leakage magnetic flux is reduced, the inductance is increased, the alternating current resistance of the winding is reduced, and the alternating current loss of the winding 40 is reduced.

In addition, when the windings 40 are supplied with current, the windings 40 generate heat energy, and when the magnetic conduction parts 60 of the embodiment of the present application extend between the windings 40, the heat dissipation area can be increased, which is beneficial to heat dissipation of the windings 40. The magnetic conduction portion 60 stretches into the windings 40, heat in the windings 40 is easier to be transmitted to the upright post 30 with good heat conduction performance, heat is radiated through the upright post 30, and heat in the windings 40 can be transmitted to the magnetic conduction portion 60 (the heat conduction performance of the magnetic conduction portion 60 is generally better than that of air) and transmitted to the yoke portion 50 for radiation, so that the radiation performance of the magnetic element 20 is enhanced.

As shown in fig. 8, fig. 8 is a schematic structural view of another magnetic element 20. The magnetically permeable portion 60 may be fixedly attached to the outer surface of the post 30, and the magnetically permeable portion 60 is embedded in the gap 42 of the adjacent two layers of coils 41. The arrow loop at B4 in fig. 8 indicates that the magnetic flux of the winding 40 may form a closed magnetic flux loop through the upright 30, the top plate 21, the yoke 50 and the bottom plate 22, and the arrow loop at B5 in fig. 8 indicates that after the magnetic conducting portion 60 is disposed, a part of the magnetic conducting portion 60 extends into the gap between the adjacent coils 41, another part of the magnetic conducting portion 60 may be located on the side of the winding 40 facing the bottom plate 22, and the magnetic conducting portion 60 provides a low reluctance path (the reluctance of the magnetic conducting portion 60 is generally smaller than the reluctance of air) for the leakage magnetic flux, so as to be able to restrain the leakage magnetic flux in the air. By providing the magnetic conductive portion 60 on the column 30, it is possible to reduce the leakage magnetic flux between the column 30 and the yoke 50, and to reduce the leakage magnetic flux to cut the winding 40, which is advantageous in reducing the ac resistance of the winding 40, thereby reducing the ac loss of the winding 40.

Referring to fig. 7 and 8, the magnetic conductive portion 60 and the yoke 50 may be in an integral structure, or the magnetic conductive portion 60 and the column 30 may be in an integral structure. If the magnetic conductive portion 60 is assembled with the upright post 30 or the magnetic conductive portion 60 is assembled with the yoke 50 in a split structure, an air gap exists in the joint, which increases the leakage flux in the magnetic element 20. The magnetic conduction portion 60 and the yoke portion 50 can be integrated, or the magnetic conduction portion 60 and the upright post 30 can be integrated, so that the leakage magnetic flux can be prevented from increasing between the integrated structures. In other embodiments, the magnetic conductive portion 60 and the column 30 or the magnetic conductive portion 60 and the yoke 50 may be formed as separate structures and fixedly connected to each other, as needed.

Referring to fig. 7, a gap is provided between an end of the magnetic conductive portion 60 facing away from the yoke portion 50 and the column 30. In other embodiments, one end of the magnetic conductive portion 60 away from the yoke portion 50 may extend to the upright post 30, that is, one end of the magnetic conductive portion 60 away from the yoke portion 50 may contact the upright post 30, so as to increase the occupied space of the magnetic conductive portion 60, reduce the space occupied by air, reduce the cutting of the leakage magnetic flux to the winding, and reduce the ac loss of the winding 40.

Referring to fig. 8, a gap is provided between an end of the magnetic conductive portion 60 facing away from the column 30 and the yoke portion 50. In other embodiments, one end of the magnetic conductive portion 60 away from the upright post 30 extends to the yoke 50, that is, one end of the magnetic conductive portion 60 away from the upright post 30 may contact with the yoke 50, so as to increase the occupied space of the magnetic conductive portion 60, reduce the space occupied by air, reduce the cutting of the leakage magnetic flux to the winding, and reduce the ac loss of the winding 40.

In some embodiments, the upright 30, the top plate 21, the other upright 30 and the bottom plate 22 may form a carrier of a closed magnetic flux loop, a magnetic conduction portion 60 may be disposed on the upright 30, a gap may be disposed between one end of the magnetic conduction portion 60 away from the upright 30 and the other upright 30, and one end of the magnetic conduction portion 60 away from the upright 30 may also extend to the other upright 30, that is, one end of the magnetic conduction portion 60 away from the upright 30 contacts the other upright 30, so that the occupied space of the magnetic conduction portion 60 can be increased, the occupied space of air is reduced, the cutting of the leakage magnetic flux to the winding 40 is reduced, and the ac loss of the winding 40 is reduced.

Fig. 9 is a schematic diagram of another magnetic element 20. The number of the magnetic conductive portions may be at least two, and fig. 9 is described by taking five magnetic conductive portions as an example. The plurality of magnetic conductive portions are respectively the first magnetic conductive portion 61 and the second magnetic conductive portion 62 arranged at intervals along the third direction A3. The first magnetically conductive portion 61 may be located on a side of the second magnetically conductive portion 62 facing the top plate 21, and the first magnetically conductive portion 61 may be located on a side of the second magnetically conductive portion 62 facing the bottom plate 22. The number of the first magnetic conductive portions 61 may be one, two, or three, etc., and the number of the second magnetic conductive portions 62 may be one, two, or three, etc., and the number of the first magnetic conductive portions 61 and the second magnetic conductive portions 62 is not limited in this application.

In some embodiments, the dimension L1 of the first magnetically permeable portion 61 in the third direction A3 may be greater than the dimension L2 of the second magnetically permeable portion 62 in the third direction A3. When the first magnetic conductive portion 61 is located on the side of the second magnetic conductive portion 62 facing the top plate 21, the first magnetic conductive portion 61 is located closer to the junction between the top plate 21 and the upright post 30 than the second magnetic conductive portion 62, and when the first magnetic conductive portion 61 is located on the side of the second magnetic conductive portion 62 facing the bottom plate 22, the first magnetic conductive portion 61 is located closer to the junction between the bottom plate 22 and the upright post 30 than the second magnetic conductive portion 62. An air gap may exist at the connection position of the top plate 21 and the upright 30 and the connection position of the bottom plate 22 and the upright 30, so that the leakage magnetic flux at the connection position of the top plate 21 and the upright 30 and the connection position of the bottom plate 22 and the upright 30 is more than at other positions, the leakage magnetic flux at the connection position of the top plate 21 and the upright 30 and the connection position of the bottom plate 22 and the upright 30 can be restrained at the first magnetic conduction part 61, the first magnetic conduction part 61 is easy to be saturated, and the first magnetic conduction part 61 at the position with more leakage magnetic flux can be prevented from being saturated by setting the size of the first magnetic conduction part 61 in the third direction A3 to be larger than the size of the second magnetic conduction part 62 in the third direction A3.

In other embodiments, the dimension L1 of the first magnetic conductive portion 61 in the third direction A3 may be greater than the dimension L2 of the second magnetic conductive portion 62 in the third direction A3, which will not be described in detail.

Referring again to fig. 7, the post 30 may include a first section 31 and a second section 32 aligned along a third direction A3, and an air gap 33 may be provided between the first section 31 and the second section 32.

The size of the magnetic conductive portion 60 corresponding to the air gap 33 (the magnetic conductive portion 60 corresponding to the air gap 33 may be understood as the magnetic conductive portion 60 in the vicinity of the air gap 33 capable of restraining the leakage magnetic flux at the position of the air gap 33, and is not limited to the magnetic conductive portion 60 corresponding to the air gap 33) may be larger in the third direction A3 than the sizes of the other magnetic conductive portions 60 in the third direction A3 (the sizes of the plurality of magnetic conductive portions 60 in the third direction A3 in fig. 7 are substantially equal by taking the five magnetic conductive portions 60 as an example, but it is understood that the size of the third magnetic conductive portion 60 in the third direction A3 in the direction from the top plate 21 to the bottom plate 22 in fig. 7 may be designed to be larger than the sizes of the other four magnetic conductive portions 60 in the third direction A3). Since the size of the magnetically conductive portion 60 corresponding to the air gap 33 in the third direction A3 can be larger than the size of the other magnetically conductive portion 60 in the third direction A3, the magnetically conductive portion at the position where the leakage magnetic flux is large can be prevented from being saturated by providing the vicinity of the air gap 33 with a large leakage magnetic flux.

In other embodiments, the size of the magnetic conductive portion 60 corresponding to the air gap 33 in the third direction A3 may be larger than the size of the other magnetic conductive portion 60 in the third direction A3, which will not be described in detail.

In some embodiments, the sizes of the plurality of magnetic conductive portions 60 in the third direction A3 may be all equal, and the size of the plurality of magnetic conductive portions 60 is not limited in this application and may be adjusted as required.

As shown in fig. 10, fig. 10 is a schematic structural view of a magnetic element 20. The magnetic element 20 may include a housing 71 and a gel (not shown in fig. 10), wherein the top plate 21, the bottom plate 22, the column 30 and the winding 40 are all located in the housing 71, the housing 71 is a structure with one side open, and the gel may be located between the housing 71 and the top plate 21, the bottom plate 22, the column 30 and the winding 40, and a gap is provided between the gel and the yoke 50. The number of the posts 30 and the windings 40 is not limited, and may be one, two, three, or the like, and fig. 10 illustrates one post 30 and one winding 40. The casing 71 may be a casing having high heat conductivity, such as a copper casing, an iron casing, or an aluminum casing, and the colloid may be a heat-dissipating adhesive, which is not limited in this application. When current is supplied, the winding 40 generates heat energy, the heat energy is transmitted to the upright post 30, the temperature of the upright post 30 is increased, the magnetic permeability of the upright post 30 is reduced, the saturation magnetic flux density of the upright post 30 is reduced, the leakage magnetic flux is increased, and the inductance is reduced. By providing the housing 71 and the gel, the temperature of the winding 40 can be transmitted to the housing 71 through the gel and dispersed into the surrounding air through the housing 71, and the temperature of the magnetic element 20 can be reduced, so that the reduction in the inductance of the magnetic element 20 can be reduced. The temperature rise of the winding 40 will cause the temperature rise of the colloid, the volume of the colloid will increase, if the colloid contacts the yoke 50, when the volume of the colloid increases, a larger force will act on the yoke 50, resulting in loose or broken connection between the yoke 50 and the top plate 21 and the bottom plate 22, and unstable structure, 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 being heated and expanded.

It should be understood that, 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 is provided between the colloid and the yoke 50 to reduce the temperature of the magnetic element 20, reduce the inductance of the magnetic element 20, and avoid the unstable structure of the magnetic element 20, and the arrangement of the housing 71 and the colloid will not be repeated in the following embodiments.

As shown in fig. 11, fig. 11 is a schematic view of the internal structure of another magnetic element 20. The magnetic element 20 may include the top plate 21, the bottom plate 22, the posts 30, the windings 40, and the magnetically permeable portion 60, without including the yoke 50. The magnetic conductive portion 60 may be fixedly connected to the outer surface of the post 30 and is inserted into the gap between the coils 41. One end of the magnetically permeable portion 60 facing away from the column 30 faces the other column 30. The structures, positions, connection relationships, etc. of the top plate 21, the bottom plate 22, the upright post 30, and the winding 40 refer to the foregoing schemes, and are not described herein. The number of the posts 30 may be one, two, three, etc., and the outer surface of each post 30 may be provided with the winding 40. The magnetic conductive portions 60 are fixedly connected to the outer surfaces of the columns 30, and it is understood that when the number of the columns 30 is one, the magnetic conductive portions 60 are disposed on the outer surfaces of the columns 30, and when the number of the columns 30 is at least two, some (at least one) of the outer surfaces of the columns 30 may be fixedly connected to the magnetic conductive portions 60, and other of the outer surfaces of the columns 30 may not be fixedly connected to the magnetic conductive portions 60, or all of the outer surfaces of the columns 30 may be disposed with the magnetic conductive portions 60.

In fig. 11, taking two columns 30 as an example, the two columns 30 are arranged at intervals along the first direction A1, and the outer surface of each column 30 is provided with a winding 40. The upright 30, the top plate 21, the further upright 30 and the bottom plate 22 form a carrier of a closed magnetic flux circuit, through which the magnetic flux around the winding 40 can form through the upright 30, the top plate 21, the further upright 30 and the bottom plate 22. By providing the magnetic conduction portion 60 on the upright post 30, the magnetic conduction portion 60 provides a low magnetic resistance channel for the leakage magnetic flux (the magnetic resistance of the magnetic conduction portion 60 is generally smaller than that of air), so that the leakage magnetic flux can be reduced, the inductance is increased, the leakage magnetic flux around the winding 40 can form a closed magnetic flux loop through the magnetic conduction portion 60, the leakage magnetic flux is avoided, the winding 40 is cut, and the ac loss of the winding 40 is reduced. In addition, the magnetic conductive portion 60 of the embodiment of the present application extends between the windings 40, which is beneficial to heat dissipation of the windings 40.

Referring to fig. 11, a gap is provided between one end of the magnetic conductive portion 60 facing away from the pillar 30 and the other pillar 30. In other embodiments, one end of the magnetic conductive portion 60 away from the upright post 30 may extend to another adjacent upright post 30, that is, one end of the magnetic conductive portion 60 away from the upright post 30 contacts another adjacent upright post 30, so as to increase the occupied space of the magnetic conductive portion 60, reduce the space occupied by air, and be beneficial to reducing the cutting of the leakage magnetic flux to the winding 40 and reducing the ac loss.

As shown in fig. 12, 13 and 14, fig. 12 is a schematic perspective view of another magnetic element 20, fig. 13 is a side view of the magnetic element 20 shown in fig. 12, fig. 14 is a top view of a part of the structure of the magnetic element 20 shown in fig. 12, and in particular, fig. 14 is a top view of the magnetic element 20 shown in fig. 12 after the top plate is removed. In this embodiment, the number of the columns 30 may be at least two, at least two columns 30 may be arranged at intervals along the first direction A1, the number of the windings 40 is consistent with that of the columns 30, and the outer surface of each column 30 is provided with the windings 40. The number of the second yokes 52 is at least two, each upright 30 may be provided with one second yoke 52, and some upright 30 may not be provided with the second yoke 52. Fig. 12 to 14 illustrate an example in which the number of the columns 30 is three, the number of the windings 40 is three, and the number of the second yokes 52 is three. In the second direction A2, one of the columns 30 may be correspondingly provided with one of the second yokes 52, and in the first direction, a gap 503 is provided between two adjacent second yokes 52, which is favorable for heat dissipation of the windings 40 of the magnetic element 20, reducing the magnetic permeability attenuation of the column 30, reducing the leakage magnetic flux, and improving the inductance. In other embodiments, at least two second yokes 52 may be connected in the first direction A1 as a unitary structure.

Referring to fig. 12, 13 and 14, in the embodiment of the present application, the third yoke 53 may be provided, and the number of the third yokes 53 may be one, two or three, etc., which is not limited in the present application. The third yoke 53 is not provided with the magnetic conduction portion 60, and the third yoke 53 may be located between the adjacent columns 30 or may be located at the most edge position of the magnetic element 20, so that more magnetic flux loops are formed by providing the third yoke 53, so as to restrict the magnetic flux generated by the winding 40 and increase the inductance.

In the embodiment of the present application, a magnetic conduction portion may be provided on the upright post 30 to reduce leakage magnetic flux and reduce ac loss of the winding 40.

In some embodiments, the number of windings 40 may be at least two, with each winding 40 corresponding to an equal number of flux loops. The magnetic flux can form a closed magnetic flux loop through the upright post, the top plate, the other upright post and the bottom plate, the magnetic flux can form a closed magnetic flux loop through the upright post, the top plate, the yoke parts and the bottom plate, and the number, the positions and the like of the yoke parts can influence the number of the magnetic flux loops. The magnetic flux density of the top and bottom plates corresponding to the windings 40 having a small number of magnetic flux loops is large, and the magnetic permeability of the top and bottom plates 21 and 22 is severely attenuated, so that the inductance is reduced. The number of the columns 30 and the yokes 50 in the magnetic element 20, the positions of the yokes 50 and the like can be set according to the requirement, so that the number of the magnetic flux loops corresponding to each winding 40 is equal, the difference of the magnetic flux densities of the top plate and the bottom plate corresponding to each winding 40 can be reduced, the attenuation of the magnetic permeability of the top plate and the bottom plate corresponding to the winding 40 with the small number of the magnetic flux loops is avoided, and the difference of inductance values around each winding 40 is reduced.

As shown in fig. 15, 16 and 17, fig. 15 is a schematic perspective view of another magnetic element 20, fig. 16 is a side view of the magnetic element 20 shown in fig. 15, fig. 17 is a top view of a part of the structure of the magnetic element 20 shown in fig. 15, and in particular, fig. 17 is a top view of the magnetic element 20 shown in fig. 15 after the top plate is removed. In the present embodiment, the number of windings 40 is described as three. The number of the columns may be three, the three columns may be the first column 31, the second column 32, and the third column 33, respectively, the first column 31, the second column 32, and the third column 33 may be disposed at intervals along the first direction A1, the number of the third yokes 53 may be two, the two third yokes 53 may be aligned with the first column 31, the second column 32, or the third column 33 along the first direction A1, and the two third yokes 53 may be located between adjacent columns 30 (between the first column 31 and the second column 32, or between the second column and the third column 33), respectively. In the first direction A1, two columns (the first column 31 and the third column 33) at opposite ends of the magnetic element 20 are provided with the second yoke 52 in correspondence, and the second yoke 52 may not be provided around the second column 32. In this embodiment, the first upright 31 and the third upright 33 are provided with the third yoke 53 on one side, the first upright 31 forms a magnetic flux loop with the third yoke 53 on one side, the top plate 21 and the bottom plate 22, the third upright 33 forms a magnetic flux loop with the third yoke 53 on one side, the top plate 21 and the bottom plate 22, the second upright 32 has the third yoke 53 on both sides, and the second upright 32 forms two magnetic flux loops with the third yokes 53 on both sides, the top plate 21 and the bottom plate 22. The smaller number of magnetic flux loops for the windings wound around the first leg 31 and the third leg 33 compared to the windings wound around the second leg 32 may result in a greater magnetic flux density for the top plate 21 and the bottom plate 22 for the windings wound around the first leg 31 and the third leg 33, a severe attenuation in permeability for the top plate and the bottom plate for the first leg 31 and the third leg 33, and a reduced inductance for the magnetic element 20. By providing the second yoke 52 corresponding to the first upright 31 and the third upright 33, one magnetic flux loop can be added to the first upright 31 and the third upright 33, so that the number of magnetic flux loops corresponding to the three windings 40 around the three uprights 30 is equal, the difference of magnetic flux densities of the top plate and the bottom plate corresponding to each winding 40 can be reduced, the attenuation of the magnetic permeability of the top plate and the bottom plate is avoided, and the difference of inductance around each winding 40 is reduced.

It will be appreciated that the first yoke may be disposed on the first upright 31 and the third upright 33 correspondingly, and the first yoke may be located at two opposite ends of the magnetic element 20 in the first direction A1, that is, the first yoke may be located at a side of the first upright 31 away from the second upright 32 and a side of the third upright 33 away from the second upright 32 in the first direction A1, respectively.

In this embodiment, the magnetic conductive portions may be disposed on the first upright 31, the second upright 32, and the third upright 33 to reduce leakage magnetic flux and reduce ac loss of the winding 40.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (13)

1. The magnetic element is characterized by comprising a top plate, a bottom plate, upright posts, windings and a magnetic conduction part;

the top plate and the bottom plate are arranged at intervals, and the upright posts are fixedly connected between the top plate and the bottom plate;

the winding comprises at least two layers of coils which are connected with each other, and the winding is wound on the outer surface of the upright post;

The magnetic conduction portion is fixedly connected to the outer surface of the upright post, and the magnetic conduction portion is embedded into a gap between at least two adjacent layers of coils, or is positioned on one side of the winding, facing the top plate or the bottom plate.

2. A magnetic component according to claim 1, wherein the number of the posts is at least two, at least two of the posts are arranged at intervals along the first direction, the outer surface of each of the posts is provided with the winding, at least one of the posts is provided with the magnetically permeable portion, and one end of the magnetically permeable portion facing away from the post extends to the adjacent other post.

3. The magnetic element is characterized by comprising a top plate, a bottom plate, upright posts, windings, a yoke part and a magnetic conduction part;

the top plate and the bottom plate are arranged at intervals, and the upright posts are fixedly connected between the top plate and the bottom plate;

the winding comprises at least two layers of coils which are connected with each other, and the winding is wound on the outer surface of the upright post;

the yoke part is positioned on one side of the winding and is fixedly connected with the top plate and/or the bottom plate;

the magnetic conduction part is fixedly connected to the outer surface of the upright post, or is fixedly connected to one side of the yoke part, which faces the winding;

The magnetic conduction part is embedded in a gap between at least two adjacent layers of coils, or is positioned on one side of the winding facing the top plate or the bottom plate.

4. A magnetic component according to claim 3, wherein the magnetically permeable portion is of unitary construction with the upright or the magnetically permeable portion is of unitary construction with the yoke.

5. A magnetic component as claimed in claim 3 or claim 4, wherein an end of the magnetically permeable portion facing away from the post extends to an adjacent further post, or an end of the magnetically permeable portion facing away from the post extends to the yoke, or an end of the magnetically permeable portion facing away from the yoke extends to the post.

6. A magnetic component according to any of claims 3-5, wherein the yoke connecting the magnetically permeable portion is arranged in a first direction with the pillar and is a first yoke, or wherein the yoke connecting the magnetically permeable portion is arranged in a second direction with the pillar and is a second yoke, the first direction intersecting the second direction.

7. The magnetic component of claim 6, wherein the number of the posts is at least two, the at least two posts are arranged at intervals along the first direction, the outer surface of each of the posts is provided with the winding, the number of the second yokes is at least two, and a gap is provided between two adjacent second yokes in the first direction.

8. A magnetic component according to claim 3, wherein the number of windings is at least two, and the number of flux loops corresponding to each of the windings is equal.

9. A magnetic component according to claim 3 or 8, wherein the number of the vertical posts is at least three, at least three vertical posts are arranged at intervals along a first direction, a third yoke portion is arranged between two adjacent vertical posts, a gap is arranged between the third yoke portion and the magnetic conduction portion, two vertical posts at opposite ends of the magnetic component are correspondingly provided with the second yoke portions in the first direction, the second yoke portions connecting the magnetic conduction portions and the vertical posts are arranged along a second direction, and the second direction intersects the first direction.

10. A magnetic component according to claim 1 or 3, wherein the number of the magnetic conductive parts is at least two, and the magnetic conductive parts are a first magnetic conductive part and a second magnetic conductive part which are arranged at intervals, the first magnetic conductive part is positioned at one side of the second magnetic conductive part facing the top plate, or the first magnetic conductive part is positioned at one side of the second magnetic conductive part facing the bottom plate, the size of the first magnetic conductive part in a third direction is larger than the size of the second magnetic conductive part in the third direction, and the third direction is the arrangement direction of the top plate and the bottom plate.

11. A magnetic component according to claim 1 or 3, wherein the upright comprises a first section and a second section, an air gap is provided between the first section and the second section, the size of the magnetically permeable portion corresponding to the air gap in the third direction is larger than the sizes of the remaining magnetically permeable portions in the third direction, and the third direction is the arrangement direction of the top plate and the bottom plate.

12. A magnetic component according to any of claims 3-11, comprising a housing and a gel, wherein the top plate, the bottom plate, the post and the winding are all located within the housing, the gel is located between the housing and the top plate, the bottom plate, the post and the winding, and a gap is provided between the gel and the yoke.

13. An electronic device comprising a power conversion circuit and the magnetic element of any one of claims 1-12, the magnetic element being electrically connected to the power conversion circuit.

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