Magnetic element, magnetic integrated device and three-phase converter

Abstract

The invention provides a magnetic element, a magnetic integrated device and a three-phase converter. The magnetic element comprises first to fourth return columns; part of the first return column is located between the first winding column and the second winding column, the other part of the first return column is located on the side, away from the third winding column, of the first end of the first winding column, and part of the second return column is located between the second winding column and the third winding column. The other part of the second return column is located on the side, away from the first winding column, of the second end of the third winding column. The third return column and the fourth return column are arranged at intervals, at least part of the third return column is located on the side, away from the third winding column, of the second end of the first winding column, and at least part of the fourth return column is located on the side, away from the first winding column, of the first end of the third winding column. According to the magnetic element, the return columns are arranged, so that the magnetic flux distribution in the winding columns is more uniform, meanwhile, the magnetic circuit coupling of the magnetic flux of the winding columns in the cover plate is improved, the magnetic circuit counteracting effect is improved, and the magnetic core loss of the magnetic element is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of electrical equipment, and particularly relates to a magnetic component, a magnetic integration device and a three-phase converter. Background Art

[0002] A three-phase converter includes a first-side circuit, a second-side circuit and a magnetic component, and the magnetic component is electrically connected to the first-side circuit and the second-side circuit. The three-phase converter is widely used because its three-phase bridge arms work alternately, the input and output current ripples are small, and it is suitable for environments with large power.

[0003] In the solutions of the related art, in order to improve the power density, the magnetic components in the three-phase converter can be made into an integral magnetic integration device by means of magnetic integration. However, the magnetic components in the related art have the problem of large core loss. Summary of the Invention

[0004] In order to overcome the above defects in the related art, the purpose of the present application is to provide a magnetic component, a magnetic integration device and a three-phase converter, which is beneficial to reducing the core loss of the magnetic component.

[0005] On the one hand, the present application provides a magnetic component, including a first cover plate and a second cover plate arranged opposite to each other. A first winding column, a second winding column and a third winding column are arranged between the first cover plate and the second cover plate. A first winding is arranged on the first winding column, a second winding is arranged on the second winding column, and a third winding is arranged on the third winding column;

[0006] It further includes a plurality of return columns connecting the first cover plate and the second cover plate. The plurality of return columns include a first return column, a second return column, a third return column and a fourth return column; along a first direction, the first return column and the second return column are located on a first side of the first winding, the second winding and the third winding; the third return column and the fourth return column are located on a second side of the first winding, the second winding and the third winding;

[0007] Along the second direction, the first end of the first winding post is close to the third winding post, and the second end of the first winding post is away from the third winding post; the first end of the third winding post is away from the first winding post, and the second end of the third winding post is close to the first winding post; the first return post and the second return post are spaced apart, part of the first return post is located between the first winding post and the second winding post, and another part of the first return post is located on the side of the first end of the first winding post away from the third winding post, part of the second return post is located between the second winding post and the third winding post, and another part of the second return post is located on the side of the second end of the third winding post away from the first winding post; the third return post and the fourth return post are spaced apart, at least part of the third return post is located on the side of the second end of the first winding post away from the third winding post, and at least part of the fourth return post is located on the side of the first end of the third winding post away from the first winding post.

[0008] In a possible implementation, along the second direction, the first end of the first return post is close to the second winding post; the second end of the first return post extends to the second end of the first winding post, or the second end of the first return post is located on a side of the second end of the first winding post away from the third winding post;

[0009] Along the second direction, the second end of the second return column is close to the second winding column; the first end of the second return column extends to the first end of the third winding column, or the first end of the second return column is located on the side of the first end of the third winding column away from the first winding column.

[0010] In a possible implementation, the first return post includes a first sub-return post and a second sub-return post, along the second direction, the second sub-return post is located between the first winding post and the second winding post, and the first sub-return post is located on a side of the second end of the first winding post away from the third winding post;

[0011] The second return column includes a third sub-return column and a fourth sub-return column. Along the second direction, the third sub-return column is located between the second winding column and the third winding column, and the fourth sub-return column is located on the side of the first end of the third winding column away from the first winding column.

[0012] In a possible implementation, it further includes a fifth return column. Along the second direction, the third return column, the fourth return column, and the fifth return column are arranged at intervals; along the first direction, the fifth return column is located on the second side of the first winding, the second winding, and the third winding; in a plane perpendicular to the first direction, the projection of the third return column is within the projection range of the first winding, the projection of the fifth return column is within the projection range of the second winding, and the projection of the fourth return column is within the projection range of the third winding.

[0013] In a possible implementation, it further includes a fifth return column. Along the second direction, the third return column, the fourth return column, and the fifth return column are arranged at intervals; the third return column is located on the side of the second end of the first winding column away from the third winding column, and the fourth return column is located on the side of the first end of the third winding column away from the first winding column; along the first direction, the fifth return column is located on the second side of the first winding, the second winding, and the third winding, and in a plane perpendicular to the first direction, the projection of the fifth return column is within the projection range of the second winding.

[0014] In a possible implementation, it further includes a first heat transfer member and a second heat transfer member; the first heat transfer member includes a first sub-heat transfer portion and a second sub-heat transfer portion, the second sub-heat transfer portion is connected to the first end of the first sub-heat transfer portion, and the first end of the first sub-heat transfer portion is close to the fifth return column; the second heat transfer member includes a third sub-heat transfer portion and a fourth sub-heat transfer portion, the fourth sub-heat transfer portion is connected to the second end of the third sub-heat transfer portion, and the second end of the third sub-heat transfer portion is close to the fifth return column;

[0015] Along the second direction, the first sub-heat transfer portion is located between the third return column and the fifth return column, and the second sub-heat transfer portion is located between the first winding and the second winding; the third sub-heat transfer portion is located between the fifth return column and the fourth return column, and the fourth sub-heat transfer portion is located between the second winding and the third winding.

[0016] In a possible implementation, in a plane perpendicular to the first direction, the projection of the third return column is within the projection range of the first winding, and the projection of the fourth return column is within the projection range of the third winding.

[0017] In a possible implementation, it further includes a third heat transfer member, and the third heat transfer member includes a fifth sub-heat transfer portion, a sixth sub-heat transfer portion, and a seventh sub-heat transfer portion;

[0018] Along the second direction, the sixth sub-heat transfer part and the seventh sub-heat transfer part are respectively connected to two ends of the fifth sub-heat transfer part. The fifth sub-heat transfer part is located between the third return column and the fourth return column. The sixth sub-heat transfer part is located between the first winding and the second winding. The seventh sub-heat transfer part is located between the second winding and the third winding.

[0019] In a possible implementation manner, it further includes a fourth heat transfer component, and the fourth heat transfer component includes an eighth sub-heat transfer part, a ninth sub-heat transfer part, and a tenth sub-heat transfer part;

[0020] Along the second direction, the ninth sub-heat transfer part and the tenth sub-heat transfer part are respectively connected to two ends of the eighth sub-heat transfer part. The eighth sub-heat transfer part is located between the third return column and the fourth return column. The ninth sub-heat transfer part is located between the first winding and the second winding. The tenth sub-heat transfer part is located between the second winding and the third winding;

[0021] Wherein, the third return column is located on a side of the second end of the first winding column away from the third winding column, and the fourth return column is located on a side of the first end of the third winding column away from the first winding column; in a plane perpendicular to the first direction, the projection of the eighth sub-heat transfer part is at least located within the projection ranges of the first winding and the third winding.

[0022] On the other hand, the present application provides a magnetic integration device, including the magnetic element as described in any one of the above and a third cover plate. The third cover plate is located between the first cover plate and the second cover plate. The first winding includes a first upper winding and a first lower winding, and the first upper winding and the first lower winding are respectively located on a first side and a second side of the third cover plate. The second winding includes a second upper winding and a second lower winding, and the second upper winding and the second lower winding are respectively located on the first side and the second side of the third cover plate. The third winding includes a third upper winding and a third lower winding, and the third upper winding and the third lower winding are respectively located on the first side and the second side of the third cover plate.

[0023] On yet another hand, the present application provides a magnetic integration device, including the magnetic element as described in any one of the above and a third cover plate. The third cover plate is located between the first cover plate and the second cover plate. The first winding includes a first transformer winding and a first inductor winding, and the first transformer winding and the first inductor winding are respectively located on a first side and a second side of the third cover plate. The second winding includes a second transformer winding and a second inductor winding, and the second transformer winding and the second inductor winding are respectively located on the first side and the second side of the third cover plate. The third winding includes a third transformer winding and a third inductor winding, and the third transformer winding and the third inductor winding are respectively located on the first side and the second side of the third cover plate;

[0024] The first return column includes a first upper return column and a first lower return column, the second return column includes a second upper return column and a second lower return column, the third return column includes a third upper return column and a third lower return column, and the fourth return column includes a fourth upper return column and a fourth lower return column. Among them, the first upper return column, the second upper return column, the third upper return column, and the fourth upper return column connect the first cover plate and the third cover plate, and the first lower return column, the second lower return column, the third lower return column, and the fourth lower return column connect the third cover plate and the second cover plate;

[0025] The first upper return column, the second upper return column, the third upper return column, the fourth upper return column, the first cover plate, the third cover plate, the first transformer winding, the second transformer winding, and the third transformer winding form a transformer; the first lower return column, the second lower return column, the third lower return column, the fourth lower return column, the third cover plate, the second cover plate, the first inductor winding, the second inductor winding, and the third inductor winding form an inductor.

[0026] In another aspect, the present application provides a three-phase converter, including a first-side circuit and a second-side circuit, and further including a magnetic element or a magnetic integration device, where the magnetic element or the magnetic integration device is electrically connected between the first-side circuit and the second-side circuit. Among them, the magnetic element adopts any one of the magnetic elements described above, and the magnetic integration device adopts any one of the magnetic integration devices described above.

[0027] The present application provides a magnetic element, a magnetic integrated device and a three-phase converter, wherein the magnetic element comprises a first cover plate and a second cover plate which are arranged opposite to each other, a first winding post, a second winding post and a third winding post are arranged between the first cover plate and the second cover plate, a first winding is arranged on the first winding post, a second winding is arranged on the second winding post, and a third winding is arranged on the third winding post; the magnetic element also comprises a plurality of return posts connecting the first cover plate and the second cover plate, the plurality of return posts comprise a first return post, a second return post, a third return post and a fourth return post; along a first direction, the first return post and the second return post are located on a first side of the first winding, the second winding and the third winding; the third return post and the fourth return post are located on a second side of the first winding, the second winding and the third winding; along a second direction, the first end of the first winding post is close to the third winding The winding post, the second end of the first winding post is far away from the third winding post; the first end of the third winding post is far away from the first winding post, and the second end of the third winding post is close to the first winding post; the first return post and the second return post are spaced apart, part of the first return post is located between the first winding post and the second winding post, and another part of the first return post is located on the side of the first end of the first winding post away from the third winding post, part of the second return post is located between the second winding post and the third winding post, and another part of the second return post is located on the side of the second end of the third winding post away from the first winding post; the third return post and the fourth return post are spaced apart, at least part of the third return post is located on the side of the second end of the first winding post away from the third winding post, and at least part of the fourth return post is located on the side of the first end of the third winding post away from the first winding post. The present application makes the magnetic flux distribution in the winding post more uniform through the structural design of the return post, and at the same time improves the magnetic circuit coupling of the magnetic flux of each winding post in the cover plate, improves the magnetic circuit cancellation effect, and thus reduces the core loss of the magnetic element. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the following is a brief introduction to the drawings required for use in the embodiments or the related technical descriptions. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 It is the circuit schematic diagram of the three-phase converter;

[0030] Figure 2 It is a simplified structural diagram of a magnetic integrated device in the related art;

[0031] Figure 3 It is a simplified structural diagram of a magnetic element in the related art;

[0032] Figure 4 A schematic diagram of magnetic flux values ​​at some locations on a magnetic integrated device in the related art;

[0033] Figure 5 Cross-sectional view of a magnetic component provided by an embodiment of the present application;

[0034] Figure 6 is Figure 5 Schematic diagram of the magnetic path of the first winding in the magnetic component;

[0035] Figure 7 is Figure 5 Schematic diagram of the magnetic path of the second winding in the magnetic component;

[0036] Figure 8 is Figure 5 Schematic diagram of the magnetic path of the third winding in the magnetic component;

[0037] Figure 9 is Figure 5 Schematic diagram of the magnetic path of the magnetic component;

[0038] Figure 10 Cross-sectional view of a magnetic component provided by another embodiment of the present application;

[0039] Figure 11 Cross-sectional view of a magnetic component provided by yet another embodiment of the present application;

[0040] Figure 12 Cross-sectional view of a magnetic component provided by another embodiment of the present application;

[0041] Figure 13 Cross-sectional view of a magnetic component provided by another embodiment of the present application;

[0042] Figure 14 Schematic diagram of the structure of a magnetic integration device provided by an embodiment of the present application;

[0043] Figure 15 is Figure 14 Cross-sectional view taken along A-A in;

[0044] Figure 16 Schematic diagram of the structure of a magnetic integration device provided by another embodiment of the present application;

[0045] Figure 17 is Figure 16 Cross-sectional view taken along B-B in;

[0046] Figure 18 Schematic diagram of the structure of a magnetic integration device provided by yet another embodiment of the present application;

[0047] Figure 19 is Figure 18 Cross-sectional view taken along C-C in;

[0048] Figure 20 Schematic diagram of the structure of a magnetic integration device provided by yet another embodiment of the present application;

[0049] Figure 21 is Figure 20 a sectional view taken along D-D in;

[0050] Figure 22 a schematic structural diagram of a magnetic integration device provided by another embodiment of the present application;

[0051] Figure 23 is Figure 22 a sectional view taken along E-E in;

[0052] Figure 24 a schematic diagram of magnetic flux values at upper partial positions of a magnetic integration device provided by an embodiment of the present application;

[0053] Figure 25 a schematic diagram of magnetic flux values at upper partial positions of a magnetic integration device provided by another embodiment of the present application.

[0054] Reference numerals:

[0055] 10 - magnetic element;

[0056] 20 - first side circuit;

[0057] 30 - second side circuit;

[0058] 110 - first winding post; 120 - second winding post; 130 - third winding post;

[0059] 210 - first winding; 220 - second winding; 230 - third winding;

[0060] 310 - first return post; 311 - first sub-return post; 312 - second sub-return post; 320 - second return post; 321 - third sub-return post; 322 - fourth sub-return post; 330 - third return post; 340 - fourth return post; 350 - fifth return post;

[0061] 410 - first heat transfer member; 411 - first sub-heat transfer portion; 412 - second sub-heat transfer portion; 420 - second heat transfer member; 421 - third sub-heat transfer portion; 422 - fourth sub-heat transfer portion; 430 - third heat transfer member; 431 - fifth sub-heat transfer portion; 432 - sixth sub-heat transfer portion; 433 - seventh sub-heat transfer portion; 440 - fourth heat transfer member; 441 - eighth sub-heat transfer portion; 442 - ninth sub-heat transfer portion; 443 - tenth sub-heat transfer portion;

[0062] 510 - first cover plate; 520 - second cover plate; 530 - third cover plate;

[0063] X - first direction; Y - second direction; Z - third direction. Detailed implementation manners

[0064] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, rather than all of them.

[0065] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts fall within the scope of protection of this application. Without conflict, the following embodiments and the features in the embodiments may be combined with each other.

[0066] Figure 1 is the circuit schematic diagram of a three-phase converter. Please refer to Figure 1 , the three-phase converter includes a first-side circuit 20, a second-side circuit 30, and a magnetic component 10. The magnetic component 10 is electrically connected between the first-side circuit 20 and the second-side circuit 30. Specifically, the first-side circuit 20 includes a plurality of switching tubes (such as Figure 1 P1 - P6 in Figure 1 ). Among them, the fifth switching tube P5 and the sixth switching tube P6 are connected in series to form the first arm of the primary circuit; the second switching tube P3 and the fifth switching tube P4 are connected in series to form the second arm of the primary circuit; the first switching tube P1 and the fourth switching tube P2 are connected in series to form the third arm of the primary circuit. Similarly, the second-side circuit 30 also includes a plurality of switching tubes (such as Figure 1 S1 - S6 in

[0067] ), and the plurality of switching tubes are connected in series in pairs and respectively form the first arm of the secondary circuit, the second arm of the secondary circuit, and the third arm of the secondary circuit. The magnetic component 10 includes a first primary winding, a second primary winding, a third primary winding, a first secondary winding, a second secondary winding, and a third secondary winding. The first arm of the primary circuit is connected to the first arm of the secondary circuit through the first primary winding and the first secondary winding; the second arm of the primary circuit is connected to the second arm of the secondary circuit through the second primary winding and the second secondary winding; the third arm of the primary circuit is connected to the third arm of the secondary circuit through the third primary winding and the third secondary winding.

[0067] As described in the background art, the magnetic component in the solution of the related art has the problem of large core loss. As shown in Figure 2 and Figure 3 , where Figure 3 is Figure 2F-F cross-sectional view. Specifically, the magnetic component of the related art includes a first cover plate 510 and a second cover plate 520, as well as a first winding column 110, a second winding column 120, and a third winding column 130 disposed between the first cover plate 510 and the second cover plate 520. A first winding 210 (including a first primary winding and / or a first secondary winding, the same below) is provided on the first winding column 110, a second winding 220 (including a second primary winding and / or a second secondary winding, the same below) is provided on the second winding column 120, and a third winding 230 (including a third primary winding and / or a third secondary winding, the same below) is provided on the third winding column 130. The magnetic component further includes a plurality of return columns connecting the first cover plate 510 and the second cover plate 520. There are two return columns in the solution of the related art. For ease of description, the two return columns include a first return column 310 and a second return column 320. Along the first direction X, the first return column 310 and the second return column 320 are located on the first side of the first winding 210, the second winding 220, and the third winding 230. Along the second direction Y, the first return column 310 is located between the first winding 210 and the second winding 220, and the second return column 320 is located between the second winding 220 and the third winding 230.

[0068] When the magnetic component operates, most of the magnetic flux in the first winding 210 reaches the first cover plate 510 from the first winding column 110, then returns to the first winding column 110 after passing through the return column and the second cover plate 520. Most of the magnetic flux passes through the first return column 310 close to it, and a small part of the magnetic flux passes through the second return column 320 far from it. Correspondingly, most of the magnetic flux in the third winding 230 reaches the first cover plate 510 from the third winding column 130, then returns to the third winding column 130 after passing through the return column and the second cover plate 520. Most of the magnetic flux passes through the second return column 320 close to it, and a small part of the magnetic flux passes through the first return column 310 far from it. It can be understood that due to the setting position of the return column, the distribution of the magnetic flux in the magnetic component of the related art is uneven, and the magnetic flux coupling between the first winding 210 and the third winding 230 is weak, and the effect of magnetic flux cancellation cannot be well achieved. Therefore, the core loss of the magnetic component is large.

[0069] Table 1 Core loss results of the magnetic component in the related art

[0070]

[0071] Combined with Table 1 and Figure 4 It can be seen that the core loss of the magnetic component in the related art is large, and correspondingly, the core loss on the magnetic integration device is also large.

[0072] In addition, in the solution of the related art, the heat source of the magnetic component is concentrated at the position of the second winding column 120 and the second winding 220, and the heat dissipation effect is poor.

[0073] In view of this, embodiments of the present application aim to provide a magnetic component, a magnetic integration device, and a three-phase converter. By arranging the first return column and the second return column at intervals, part of the first return column is located between the first winding column and the second winding column, and the other part of the first return column is located on the side of the first end of the first winding column away from the third winding column. Part of the second return column is located between the second winding column and the third winding column, and the other part of the second return column is located on the side of the second end of the third winding column away from the first winding column; the third return column and the fourth return column are arranged at intervals. At least part of the third return column is located on the side of the second end of the first winding column away from the third winding column, and at least part of the fourth return column is located on the side of the first end of the third winding column away from the first winding column. Thereby, the magnetic flux distribution in the winding columns is made more uniform, while the magnetic circuit coupling of the magnetic fluxes of each winding column in the cover plate is improved, the effect of magnetic circuit cancellation is enhanced, and the core loss of the magnetic component is reduced.

[0074] The content of the embodiments of the present application will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can understand the content of the present application in more detail. It should be noted that in the description of the embodiments of the present application, the first direction X, the second direction Y, and the third direction Z are three different directions in three-dimensional space. For example, the first direction X, the second direction Y, and the third direction Z can be perpendicular to each other in pairs.

[0075] Please refer to Figures 5 - 13 , this embodiment provides a magnetic component, including a first cover plate and a second cover plate (not shown in the figure) arranged opposite to each other. The first cover plate and the second cover plate can be arranged opposite to each other along the third direction Z, for example. A first winding column 110, a second winding column 120, and a third winding column 130 are provided between the first cover plate and the second cover plate. Both ends of the first winding column 110, the second winding column 120, and the third winding column 130 are connected to the first cover plate and the second cover plate respectively. A first winding 210 is provided on the first winding column 110, a second winding 220 is provided on the second winding column 120, and a third winding 230 is provided on the third winding column 130.

[0076] The magnetic component further includes a plurality of return columns connecting the first cover plate and the second cover plate. The plurality of return columns include a first return column 310, a second return column 320, a third return column 330, and a fourth return column 340. Along the first direction X, the first return column 310 and the second return column 320 are located on the first side of the first winding 210, the second winding 220, and the third winding 230; the third return column 330 and the fourth return column 340 are located on the second side of the first winding 210, the second winding 220, and the third winding 230.

[0077] Please continue to refer to Figure 5 , Figures 10 - 13, along the second direction Y, the first end of the first winding post 110 is close to the third winding post 130, and the second end of the first winding post 110 is far from the third winding post 130; that is, the first end of the first winding post 110 is the right end of the first winding post 110 in the horizontal direction as shown in the figure, and the second end of the first winding post 110 is the left end of the first winding post 110 in the horizontal direction as shown in the figure. The first end of the third winding post 130 is far from the first winding post 110, and the second end of the third winding post 130 is close to the first winding post 110; that is, the first end of the third winding post 130 is the right end of the third winding post 130 in the horizontal direction as shown in the figure, and the second end of the third winding post 130 is the left end of the third winding post 130 in the horizontal direction as shown in the figure.

[0078] The first return post 310 and the second return post 320 are arranged at intervals (that is, there is a gap between them in the horizontal direction). Part of the first return posts 310 are located between the first winding post 110 and the second winding post 120, and another part of the first return posts 310 are located on the side of the first end of the first winding post 110 facing away from the third winding post 130. Part of the second return posts 320 are located between the second winding post 120 and the third winding post 130, and another part of the second return posts 320 are located on the side of the second end of the third winding post 130 facing away from the first winding post 110.

[0079] The third return post 330 and the fourth return post 340 are arranged at intervals (that is, there is a gap between them in the horizontal direction). At least part of the third return posts 330 are located on the side of the second end of the first winding post 110 facing away from the third winding post 130, and at least part of the fourth return posts 340 are located on the side of the first end of the third winding post 130 facing away from the first winding post 110.

[0080] In this embodiment, the magnetic circuit formed by the first winding 210, the second winding 220, and the third winding 230 can start from their respective corresponding winding posts to the first cover plate, then pass through the first return post 310, the second return post 320, the third return post 330, and the fourth return post 340 and then reach the second cover plate, and finally return from the second cover plate to their respective corresponding winding posts.

[0081] Please continue to refer to Figures 6 - 9 , specifically, Figure 6 shows a schematic diagram of the magnetic circuit formed by the first winding 210, where the thickness of the line represents the magnitude of the magnetic circuit strength. Obviously, the magnetic circuit formed by the first winding 210 is stronger at the first return post 310 and the third return post 330 close to the first winding 210, and weaker at the second return post 320 and the fourth return post 340 far from the first winding 210. That is, the farther away from the first winding 210, the weaker the magnetic circuit strength.

[0082] Figure 7The schematic diagram of the magnetic circuit formed by the second winding 220 is shown, where the thickness of the line represents the magnitude of the magnetic circuit strength. Obviously, since the second winding 220 is located in the middle of the magnetic component, the magnetic circuit formed by the second winding 220 shows a relatively uniform distribution at the first return column 310, the second return column 320, the third return column 330, and the fourth return column 340.

[0083] Figure 8 The schematic diagram of the magnetic circuit formed by the third winding 230 is shown, where the thickness of the line represents the magnitude of the magnetic circuit strength. Obviously, the magnetic circuit formed by the third winding 230 is stronger at the second return column 320 and the fourth return column 340 close to the third winding 230, and weaker at the first return column 310 and the third return column 330 far from the third winding 230. That is, the farther away from the third winding 230, the weaker the magnetic circuit strength.

[0084] Figure 9 The magnetic circuit coupling diagram in the magnetic component is shown. Obviously, by adopting the above structure, in this embodiment, the magnetic circuit can be relatively evenly distributed throughout the magnetic component, and the magnetic circuits formed by the first winding 210 to the third winding 230 can be mutually coupled at the first cover plate and / or the second cover plate after passing through the first return column 310, the second return column 320, the third return column 330, and the fourth return column 340, achieving the effect of magnetic circuit cancellation, thereby reducing the core loss of the magnetic component. At the same time, the magnetic flux distribution in the first winding column 110 to the third winding column 130 becomes more uniform.

[0085] It should be noted that the magnetic component in this embodiment can be a transformer composed of a primary winding connecting the first-side circuit 20, a secondary winding connecting the second-side circuit 30, and a magnetic core, or can also be a resonant inductor on the first-side circuit 20.

[0086] From the above description, it can be seen that in this embodiment, through the structural design of the return column, the magnetic flux distribution in the winding column becomes more uniform, and at the same time, the magnetic circuit coupling of the magnetic flux in each winding column in the cover plate is improved, the magnetic circuit cancellation effect is enhanced, and thus the core loss of the magnetic component is reduced.

[0087] Please continue to refer to Figure 5 and Figure 12 , in some possible implementation manners, along the second direction Y, the first end of the first return column 310 (i.e., the right end of the first return column 310 in the horizontal direction shown in the figure) is close to the second winding column 120. The second end of the first return column 310 (i.e., the left end of the first return column 310 in the horizontal direction shown in the figure) extends to the second end of the first winding column 110.

[0088] Or, in Figure 5 and Figure 12On this basis, the second end of the first return column 310 can be further arranged on the side of the second end of the first winding column 110 away from the third winding column 130, which is beneficial to further evenly distribute the magnetic paths formed by the windings everywhere in the magnetic component, thereby improving the effect of magnetic path cancellation and reducing the core loss of the magnetic component.

[0089] Similarly, along the second direction Y, the second end of the second return column 320 (i.e., the left end of the second return column 320 in the horizontal direction shown in the figure) is close to the second winding column 120; the first end of the second return column 320 (i.e., the right end of the second return column 320 in the horizontal direction shown in the figure) extends to the first end of the third winding column 130.

[0090] Or, on Figure 5 and Figure 12 On this basis, the first end of the second return column 320 can be further arranged on the side of the first end of the third winding column 130 away from the first winding column 110, which is beneficial to further evenly distribute the magnetic paths formed by the windings everywhere in the magnetic component, thereby improving the effect of magnetic path cancellation and reducing the core loss of the magnetic component.

[0091] As Figure 10 、 Figure 11 and Figure 13 shown, in some possible implementation manners, the first return column 310 includes a first sub-return column 311 and a second sub-return column 312, and the first sub-return column 311 and the second sub-return column 312 are arranged at intervals along the second direction Y. Along the second direction Y, the second sub-return column 312 is located between the first winding column 110 and the second winding column 120, and the first sub-return column 311 is located on the side of the second end of the first winding column 110 away from the third winding column 130. By arranging the first sub-return column 311, it is beneficial to further evenly distribute the magnetic paths formed by the windings everywhere in the magnetic component, thereby improving the effect of magnetic path cancellation and reducing the core loss of the magnetic component.

[0092] The second return column 320 includes a third sub-return column 321 and a fourth sub-return column 322, and the third sub-return column 321 and the fourth sub-return column 322 are arranged at intervals along the second direction Y. Along the second direction Y, the third sub-return column 321 is located between the second winding column 120 and the third winding column 130, and the fourth sub-return column 322 is located on the side of the first end of the third winding column 130 away from the first winding column 110. By arranging the fourth sub-return column 322, it is beneficial to further evenly distribute the magnetic paths formed by the windings everywhere in the magnetic component, thereby improving the effect of magnetic path cancellation and reducing the core loss of the magnetic component.

[0093] Please continue to refer to Figures 5 - 10, in some possible implementation manners, the magnetic component further includes a fifth return column 350. Along the second direction Y, the third return column 330, the fourth return column 340, and the fifth return column 350 are arranged at intervals; that is, a gap is formed between any two adjacent ones of the third return column 330, the fourth return column 340, and the fifth return column 350.

[0094] Along the first direction X, the fifth return column 350 is located on the second side of the first winding 210, the second winding 220, and the third winding 230. In a plane perpendicular to the first direction X, the projection of the third return column 330 is within the projection range of the first winding 210, the projection of the fifth return column 350 is within the projection range of the second winding 220, and the projection of the fourth return column 340 is within the projection range of the third winding 230. That is to say, in the second direction Y, the longest length of the first winding 210 is greater than or equal to the longest length of the third return column 330, the longest length of the second winding 220 is greater than or equal to the longest length of the fifth return column 350, and the longest length of the third winding 230 is greater than or equal to the longest length of the fourth return column 340.

[0095] In this embodiment, by providing the fifth return column 350, the magnetic paths formed by the windings can be further evenly distributed throughout the magnetic component, thereby improving the effect of magnetic path cancellation and reducing the core loss of the magnetic component.

[0096] As Figure 11 shown, in some possible implementation manners, the magnetic component further includes a fifth return column 350. Along the second direction Y, the third return column 330, the fourth return column 340, and the fifth return column 350 are arranged at intervals; that is, a gap is formed between any two adjacent ones of the third return column 330, the fourth return column 340, and the fifth return column 350. The third return column 330 is located on the side of the second end of the first winding column 110 facing away from the third winding column 130, and the fourth return column 340 is located on the side of the first end of the third winding column 130 facing away from the first winding column 110.

[0097] Along the first direction X, the fifth return column 350 is located on the second side of the first winding 210, the second winding 220, and the third winding 230. In a plane perpendicular to the first direction X, the projection of the fifth return column 350 is within the projection range of the second winding 220.

[0098] Different from Figure 5 and Figure 10 the embodiments shown, in this embodiment, the length of the fifth return column 350 in the second direction Y is slightly shorter, so as to form a gap between the fifth return column 350 and the third return column 330 and the fourth return column 340, thereby facilitating the installation of other components.

[0099] It can be understood that in this embodiment, by providing the fifth return column 350, the magnetic paths formed by the windings can be further evenly distributed throughout the magnetic component, thereby improving the effect of magnetic path cancellation and reducing the core loss of the magnetic component.

[0100] Please continue to refer to Figure 11 , the magnetic component of this embodiment further includes a first heat transfer member 410 and a second heat transfer member 420. The first heat transfer member 410 includes a first sub-heat transfer portion 411 and a second sub-heat transfer portion 412. The second sub-heat transfer portion 412 is connected to the first end of the first sub-heat transfer portion 411. The first end of the first sub-heat transfer portion 411 is close to the fifth return column 350. The first sub-heat transfer portion 411 and the second sub-heat transfer portion 412 generally form an "L"-shaped cross-section. The second heat transfer member 420 includes a third sub-heat transfer portion 421 and a fourth sub-heat transfer portion 422. The fourth sub-heat transfer portion 422 is connected to the second end of the third sub-heat transfer portion 421. The second end of the third sub-heat transfer portion 421 is close to the fifth return column 350. The third sub-heat transfer portion 421 and the fourth sub-heat transfer portion 422 generally form an "L"-shaped cross-section.

[0101] Along the second direction Y, the first sub-heat transfer portion 411 is located between the third return column 330 and the fifth return column 350, and the second sub-heat transfer portion 412 is located between the first winding 210 and the second winding 220. The third sub-heat transfer portion 421 is located between the fifth return column 350 and the fourth return column 340, and the fourth sub-heat transfer portion 422 is located between the second winding 220 and the third winding 230.

[0102] With the above structure in this embodiment, the second sub-heat transfer portion 412 and the fourth sub-heat transfer portion 422 can be used to respectively guide the heat at the second winding column 120 and the second winding 220 to the first sub-heat transfer portion 411 and the third sub-heat transfer portion 421, and then the first sub-heat transfer portion 411 and the third sub-heat transfer portion 421 are connected to external heat dissipation devices, thereby realizing rapid heat dissipation and improving the heat dissipation effect of the magnetic component.

[0103] Please continue to refer to Figure 12 , in some possible implementation manners, in a plane perpendicular to the first direction X, the projection of the third return column 330 is within the projection range of the first winding 210, and the projection of the fourth return column 340 is within the projection range of the third winding 230. Along the second direction Y, a gap is formed between the third return column 330 and the fourth return column 340, thereby facilitating the installation of other components.

[0104] Please continue to refer to Figure 12 , the magnetic component further includes a third heat transfer member 430. The third heat transfer member 430 includes a fifth sub-heat transfer portion 431, a sixth sub-heat transfer portion 432, and a seventh sub-heat transfer portion 433. The fifth sub-heat transfer portion 431, the sixth sub-heat transfer portion 432, and the seventh sub-heat transfer portion 433 generally form a "U"-shaped cross-section.

[0105] Along the second direction Y, the sixth sub-heat transfer part 432 and the seventh sub-heat transfer part 433 are respectively connected to both ends of the fifth sub-heat transfer part 431. The fifth sub-heat transfer part 431 is located between the third return column 330 and the fourth return column 340. The sixth sub-heat transfer part 432 is located between the first winding 210 and the second winding 220, and the seventh sub-heat transfer part 433 is located between the second winding 220 and the third winding 230.

[0106] With the above structure in this embodiment, the heat at the second winding post 120 and the second winding 220 can be respectively guided to the fifth sub-heat transfer part 431 by the sixth sub-heat transfer part 432 and the seventh sub-heat transfer part 433, and then the fifth sub-heat transfer part 431 is connected to an external heat dissipation device, so as to achieve rapid heat dissipation and improve the heat dissipation effect of the magnetic component.

[0107] Please continue to refer to Figure 13 , in some possible implementation manners, the magnetic component further includes a fourth heat transfer member 440. The fourth heat transfer member 440 includes an eighth sub-heat transfer part 441, a ninth sub-heat transfer part 442, and a tenth sub-heat transfer part 443.

[0108] Along the second direction Y, the ninth sub-heat transfer part 442 and the tenth sub-heat transfer part 443 are respectively connected to both ends of the eighth sub-heat transfer part 441. The eighth sub-heat transfer part 441 is located between the third return column 330 and the fourth return column 340. The ninth sub-heat transfer part 442 is located between the first winding 210 and the second winding 220, and the tenth sub-heat transfer part 443 is located between the second winding 220 and the third winding 230.

[0109] Wherein, the third return column 330 is located on a side of the second end of the first winding post 110 away from the third winding post 130, and the fourth return column 340 is located on a side of the first end of the third winding post 130 away from the first winding post 110; in a plane perpendicular to the first direction X, the projection of the eighth sub-heat transfer part 441 is at least within the projection ranges of the first winding 210 and the third winding 230.

[0110] With the above structure in this embodiment, the heat at the second winding post 120 and the second winding 220 can be respectively guided to the eighth sub-heat transfer part 441 by the ninth sub-heat transfer part 442 and the tenth sub-heat transfer part 443, and then the eighth sub-heat transfer part 441 is connected to an external heat dissipation device, so as to achieve rapid heat dissipation and improve the heat dissipation effect of the magnetic component.

[0111] And Figure 12What is different from the illustrated embodiment is that, in this embodiment, the length of the third return column 330 and the fourth return column 340 in the second direction Y is shortened, so that the gap between the third return column 330 and the fourth return column 340 is increased, thereby increasing the length of the eighth sub-heat transfer portion 441 in the second direction Y, that is, increasing the contact area with the external heat dissipation device, thereby achieving a better heat dissipation effect.

[0112] Please continue to refer to Figures 14 - 23 The present embodiment also provides a magnetic integrated device, comprising the magnetic element and a third cover plate 530, wherein the third cover plate 530 is located between the first cover plate 510 and the second cover plate 520, that is, the first cover plate 510, the third cover plate 530 and the second cover plate 520 are arranged in pairs in the third direction Z. The first winding 210 comprises a first upper winding and a first lower winding, wherein the first upper winding and the first lower winding are respectively located on the first side and the second side of the third cover plate 530; exemplarily, the first upper winding may be the first winding 210 located above the third cover plate 530 shown in the figure, and the first lower winding may be the first winding 210 located below the third cover plate 530 shown in the figure. The second winding 220 comprises a second upper winding and a second lower winding, wherein the second upper winding and the second lower winding are respectively located on the first side and the second side of the third cover plate 530; exemplarily, the second upper winding may be the second winding 220 located above the third cover plate 530 shown in the figure, and the second lower winding may be the second winding 220 located below the third cover plate 530 shown in the figure. The third winding 230 includes a third upper winding and a third lower winding, which are respectively located on the first side and the second side of the third cover plate 530; exemplarily, the third upper winding may be the third winding 230 located above the third cover plate 530 shown in the figure, and the third lower winding may be the third winding 230 located below the third cover plate 530 shown in the figure.

[0113] In the magnetic integrated device of this embodiment, the first winding 210, the second winding 220 and the third winding 230 can all be transformer windings or inductor windings; that is, the magnetic integrated device can include two three-phase transformers or two three-phase inductors formed on both sides of the third cover plate 530, or the magnetic integrated device can include a three-phase transformer and a three-phase inductor formed on both sides of the third cover plate 530.

[0114] in, Figure 15 The AA cross-sectional structure of the magnetic integrated device shown is similar to Figure 5 The cross-sectional views of the magnetic elements shown are of consistent structure; Figure 17 The AA cross-sectional structure of the magnetic integrated device shown is similar to Figure 10 The cross-sectional views of the magnetic elements shown are of consistent structure; Figure 19 The AA cross-sectional structure of the magnetic integrated device shown is similar to Figure 11 The cross-sectional views of the magnetic elements shown are of consistent structure; Figure 21The AA cross-sectional structure of the magnetic integrated device shown is similar to Figure 12 The cross-sectional views of the magnetic elements shown are of consistent structure; Figure 23 The AA cross-sectional structure of the magnetic integrated device shown is similar to Figure 13 The cross-sectional structures of the magnetic elements shown are consistent, and will not be described in detail in this embodiment.

[0115] It can be understood that the magnetic integrated device of this embodiment adopts the structure of the above-mentioned magnetic elements, so that the magnetic circuit formed by each winding can be evenly distributed throughout the magnetic integrated device, thereby improving the effect of magnetic circuit cancellation and reducing the core loss of the magnetic integrated device.

[0116] Please continue to refer to Figures 14 - 23 This embodiment also provides a magnetic integrated device, including the above-mentioned magnetic element and a third cover plate 530, the third cover plate 530 is located between the first cover plate 510 and the second cover plate 520, that is, the first cover plate 510, the third cover plate 530 and the second cover plate 520 are arranged in pairs in the third direction Z. The first winding 210 includes a first transformer winding and a first inductor winding, the first transformer winding and the first inductor winding are respectively located on the first side and the second side of the third cover plate 530; illustratively, the first transformer winding can be the first winding 210 located above the third cover plate 530 shown in the figure, and the first inductor winding can be the first winding 210 located below the third cover plate 530 shown in the figure. The second winding 220 includes a second transformer winding and a second inductor winding, and the second transformer winding and the second inductor winding are respectively located on the first side and the second side of the third cover plate 530; exemplarily, the second transformer winding may be the second winding 220 located above the third cover plate 530 shown in the figure, and the second inductor winding may be the second winding 220 located below the third cover plate 530 shown in the figure. The third winding 230 includes a third transformer winding and a third inductor winding, and the third transformer winding and the third inductor winding are respectively located on the first side and the second side of the third cover plate 530; exemplarily, the third transformer winding may be the third winding 230 located above the third cover plate 530 shown in the figure, and the third inductor winding may be the third winding 230 located below the third cover plate 530 shown in the figure.

[0117] The first return column 310 includes a first upper return column and a first lower return column. Exemplarily, the first upper return column may be the first return column 310 above the third cover plate 530, and the first lower return column may be the first return column 310 below the third cover plate 530. The second return column 320 includes a second upper return column and a second lower return column. Exemplarily, the second upper return column may be the second return column 320 above the third cover plate 530, and the second lower return column may be the second return column 320 below the third cover plate 530. The third return column 330 includes a third upper return column and a third lower return column. Exemplarily, the third upper return column may be the third return column 330 above the third cover plate 530, and the third lower return column may be the third return column 330 below the third cover plate 530. The fourth return column 340 includes a fourth upper return column and a fourth lower return column. Exemplarily, the fourth upper return column may be the fourth return column 340 above the third cover plate 530, and the fourth lower return column may be the fourth return column 340 below the third cover plate 530. It can be understood that the first upper return column, the second upper return column, the third upper return column, and the fourth upper return column connect the first cover plate 510 and the third cover plate 530, and the first lower return column, the second lower return column, the third lower return column, and the fourth lower return column connect the third cover plate 530 and the second cover plate 520.

[0118] In this embodiment, the first upper return column, the second upper return column, the third upper return column, the fourth upper return column, the first cover plate 510, the third cover plate 530, the first transformer winding, the second transformer winding, and the third transformer winding form a transformer. The first lower return column, the second lower return column, the third lower return column, the fourth lower return column, the third cover plate 530, the second cover plate 520, the first inductor winding, the second inductor winding, and the third inductor winding form an inductor. That is to say, the magnetic integration device may include a transformer and an inductor formed on both sides of the third cover plate 530.

[0119] Among them, Figure 15 The cross-sectional structure of the A-A cross-section view of the magnetic integration device shown is the same as that of Figure 5 the cross-sectional view structure of the magnetic element shown; Figure 17 The cross-sectional structure of the A-A cross-section view of the magnetic integration device shown is the same as that of Figure 10 the cross-sectional view structure of the magnetic element shown; Figure 19 The cross-sectional structure of the A-A cross-section view of the magnetic integration device shown is the same as that of Figure 11 the cross-sectional view structure of the magnetic element shown; Figure 21 The cross-sectional structure of the A-A cross-section view of the magnetic integration device shown is the same as that of Figure 12 the cross-sectional view structure of the magnetic element shown; Figure 23 The cross-sectional structure of the A-A cross-section view of the magnetic integration device shown is the same as that of Figure 13 the cross-sectional view structure of the magnetic element shown. This embodiment will not be elaborated herein.

[0120] It can be understood that the magnetic integration device of this embodiment adopts the structure of the above-mentioned magnetic element, so that the magnetic circuits formed by each winding can be evenly distributed throughout the magnetic integration device, thereby improving the effect of magnetic circuit cancellation and reducing the core loss of the magnetic integration device.

[0121] Table 2 Figure 5 Core loss results of the magnetic element in the illustrated embodiment

[0122]

[0123] Table 3 Figure 11 Core loss results of the magnetic element in the illustrated embodiment

[0124]

[0125] From the above Table 2 and Figure 24 and Table 3 and Figure 25 it can be seen that the core loss of the magnetic element in this embodiment is relatively small, and correspondingly, the core loss on the magnetic integration device is also relatively small. And Figure 11 the illustrated embodiment compared with Figure 5 the illustrated embodiment can further reduce the core loss of the magnetic element.

[0126] This embodiment further provides a three-phase converter, including a first-side circuit and a second-side circuit, and further including a magnetic element or a magnetic integration device, the magnetic element or the magnetic integration device being electrically connected between the first-side circuit and the second-side circuit, wherein the magnetic element adopts the magnetic element in the above embodiment, and the magnetic integration device adopts the magnetic integration device in the above embodiment.

[0127] It can be understood that the three-phase converter of this embodiment has relatively small core loss due to the adoption of the above-mentioned magnetic element or magnetic integration device, which is beneficial to improving the performance of the three-phase converter, enhancing stability, and extending the service life. In some embodiments of this case, the three-phase converter can be a three-phase resonant converter.

[0128] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0129] In this application, unless otherwise clearly specified and defined, terms such as "installed", "connected", "linked", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0130] It should be noted that in the description of this application, the terms "first" and "second" are only used for convenience in describing different components, and cannot be understood as indicating or implying an order relationship, relative importance, or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features.

[0131] The embodiments or implementation manners in this application are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0132] In the description of this application, the description with reference to terms such as "one implementation manner", "some implementation manners", "illustrative implementation manners", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the implementation manner or example are included in at least one implementation manner or example of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same implementation manner or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more implementation manners or examples.

[0133] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of this application, rather than to limit it; although this application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A magnetic element, characterized in that: It comprises a first cover plate and a second cover plate which are arranged opposite to each other, a first winding post, a second winding post and a third winding post are arranged between the first cover plate and the second cover plate, a first winding is arranged on the first winding post, a second winding is arranged on the second winding post, and a third winding is arranged on the third winding post; Also includes a plurality of return posts connecting the first cover plate and the second cover plate, the plurality of return posts including a first return post, a second return post, a third return post and a fourth return post; along the first direction, the first return post and the second return post are located on a first side of the first winding, the second winding and the third winding; The third return post and the fourth return post are located on a second side of the first winding, the second winding and the third winding; Along the second direction, the first end of the first winding post is close to the third winding post, and the second end of the first winding post is away from the third winding post; the first end of the third winding post is away from the first winding post, and the second end of the third winding post is close to the first winding post; the first return post and the second return post are spaced apart, part of the first return post is located between the first winding post and the second winding post, and another part of the first return post is located on the side of the first end of the first winding post away from the third winding post, part of the second return post is located between the second winding post and the third winding post, and another part of the second return post is located on the side of the second end of the third winding post away from the first winding post; the third return post and the fourth return post are spaced apart, at least part of the third return post is located on the side of the second end of the first winding post away from the third winding post, and at least part of the fourth return post is located on the side of the first end of the third winding post away from the first winding post.

2. The magnetic element according to claim 1, characterized in that: Along the second direction, the first end of the first return post is close to the second winding post; the second end of the first return post extends to the second end of the first winding post, or the second end of the first return post is located on the side of the second end of the first winding post away from the third winding post; Along the second direction, the second end of the second return column is close to the second winding column; the first end of the second return column extends to the first end of the third winding column, or the first end of the second return column is located on the side of the first end of the third winding column away from the first winding column.

3. The magnetic element according to claim 1, characterized in that: The first return post comprises a first sub-return post and a second sub-return post, the second sub-return post is located between the first winding post and the second winding post along the second direction, and the first sub-return post is located on the side of the second end of the first winding post away from the third winding post; The second return column includes a third sub-return column and a fourth sub-return column. Along the second direction, the third sub-return column is located between the second winding column and the third winding column, and the fourth sub-return column is located on the side of the first end of the third winding column away from the first winding column.

4. The magnetic element according to claim 2 or 3, characterized in that: It also includes a fifth return column. Along the second direction, the third return column, the fourth return column and the fifth return column are arranged at intervals; along the first direction, the fifth return column is located on the second side of the first winding, the second winding and the third winding; in a plane perpendicular to the first direction, the projection of the third return column is located within the projection range of the first winding, the projection of the fifth return column is located within the projection range of the second winding, and the projection of the fourth return column is located within the projection range of the third winding.

5. The magnetic element according to claim 2 or 3, characterized in that: It also includes a fifth return column. Along the second direction, the third return column, the fourth return column and the fifth return column are arranged at intervals; the third return column is located on the side of the second end of the first winding column away from the third winding column, and the fourth return column is located on the side of the first end of the third winding column away from the first winding column; along the first direction, the fifth return column is located on the second side of the first winding, the second winding and the third winding, and in a plane perpendicular to the first direction, the projection of the fifth return column is located within the projection range of the second winding.

6. The magnetic element according to claim 5, characterized in that: The first heat transfer member further comprises a first heat transfer part and a second heat transfer part; the first heat transfer part comprises a first sub-heat transfer portion and a second sub-heat transfer portion, the second sub-heat transfer portion is connected to a first end of the first sub-heat transfer portion, and the first end of the first sub-heat transfer portion is close to the fifth return column; the second heat transfer part comprises a third sub-heat transfer portion and a fourth sub-heat transfer portion, the fourth sub-heat transfer portion is connected to a second end of the third sub-heat transfer portion, and the second end of the third sub-heat transfer portion is close to the fifth return column; Along the second direction, the first sub-heat transfer portion is located between the third return column and the fifth return column, and the second sub-heat transfer portion is located between the first winding and the second winding; the third sub-heat transfer portion is located between the fifth return column and the fourth return column, and the fourth sub-heat transfer portion is located between the second winding and the third winding.

7. The magnetic element according to claim 2 or 3, characterized in that: In a plane perpendicular to the first direction, the projection of the third return column is located within the projection range of the first winding, and the projection of the fourth return column is located within the projection range of the third winding.

8. The magnetic element according to claim 7, characterized in that: Also included is a third heat transfer element, the third heat transfer element including a fifth sub-heat transfer portion, a sixth sub-heat transfer portion and a seventh sub-heat transfer portion; Along the second direction, the sixth sub-heat transfer portion and the seventh sub-heat transfer portion are respectively connected to two ends of the fifth sub-heat transfer portion, the fifth sub-heat transfer portion is located between the third return column and the fourth return column, the sixth sub-heat transfer portion is located between the first winding and the second winding, and the seventh sub-heat transfer portion is located between the second winding and the third winding.

9. The magnetic element according to claim 2 or 3, characterized in that: Also included is a fourth heat transfer element, the fourth heat transfer element including an eighth sub-heat transfer portion, a ninth sub-heat transfer portion and a tenth sub-heat transfer portion; Along the second direction, the ninth sub-heat transfer portion and the tenth sub-heat transfer portion are respectively connected to two ends of the eighth sub-heat transfer portion, the eighth sub-heat transfer portion is located between the third return column and the fourth return column, the ninth sub-heat transfer portion is located between the first winding and the second winding, and the tenth sub-heat transfer portion is located between the second winding and the third winding; Among them, the third return column is located on the side of the second end of the first winding column away from the third winding column, and the fourth return column is located on the side of the first end of the third winding column away from the first winding column; in a plane perpendicular to the first direction, the projection of the eighth sub-heat transfer portion is at least within the projection range of the first winding and the third winding.

10. A magnetic integrated device, characterized in that: It includes a magnetic element as described in any one of claims 1 to 9 and a third cover plate, the third cover plate is located between the first cover plate and the second cover plate, the first winding includes a first upper winding and a first lower winding, the first upper winding and the first lower winding are respectively located on the first side and the second side of the third cover plate, the second winding includes a second upper winding and a second lower winding, the second upper winding and the second lower winding are respectively located on the first side and the second side of the third cover plate, the third winding includes a third upper winding and a third lower winding, the third upper winding and the third lower winding are respectively located on the first side and the second side of the third cover plate.

11. A magnetic integrated device, characterized in that: The invention comprises a magnetic element as claimed in any one of claims 1 to 9 and a third cover plate, wherein the third cover plate is located between the first cover plate and the second cover plate, wherein the first winding comprises a first transformer winding and a first inductor winding, wherein the first transformer winding and the first inductor winding are located on a first side and a second side of the third cover plate respectively, wherein the second winding comprises a second transformer winding and a second inductor winding, wherein the second transformer winding and the second inductor winding are located on a first side and a second side of the third cover plate respectively, wherein the third winding comprises a third transformer winding and a third inductor winding, wherein the third transformer winding and the third inductor winding are located on a first side and a second side of the third cover plate respectively; The first return column includes a first upper return column and a first lower return column, the second return column includes a second upper return column and a second lower return column, the third return column includes a third upper return column and a third lower return column, and the fourth return column includes a fourth upper return column and a fourth lower return column, wherein the first upper return column, the second upper return column, the third upper return column and the fourth upper return column are connected to the first cover plate and the third cover plate, and the first lower return column, the second lower return column, the third lower return column and the fourth lower return column are connected to the third cover plate and the second cover plate; The first upper return column, the second upper return column, the third upper return column, the fourth upper return column, the first cover plate, the third cover plate, the first transformer winding, the second transformer winding and the third transformer winding constitute a transformer; the first lower return column, the second lower return column, the third lower return column, the fourth lower return column, the third cover plate, the second cover plate, the first inductor winding, the second inductor winding and the third inductor winding constitute an inductor.

12. A three-phase converter, characterized in that: It includes a first side circuit and a second side circuit, and also includes a magnetic element or a magnetic integrated device, wherein the magnetic element or the magnetic integrated device is electrically connected between the first side circuit and the second side circuit, wherein the magnetic element adopts the magnetic element as described in any one of claims 1-9, and the magnetic integrated device adopts the magnetic integrated device as described in claim 10 or 11.

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