Transformer

Abstract

The utility model provides a transformer which comprises a first magnetic core, a second magnetic core, a first side column, a middle column, a second side column and a winding. The first magnetic core and the second magnetic core are oppositely arranged in the first direction. The first side column, the middle column and the second side column are sequentially arranged at intervals in the second direction. In the first direction, the two ends of the first side column, the two ends of the middle column and the two ends of the second side column are connected with the first magnetic core and the second magnetic core respectively. Winding spaces are formed between the first side column and the middle column and between the second side column and the middle column, and the winding is wound on the middle column and located in the winding spaces; the first magnetic core or the second magnetic core is provided with at least one air gap, and the air gap extends in the third direction and penetrates through the first magnetic core or the second magnetic core in the first direction. In a plane perpendicular to the first direction, the projection of the air gap is located between the first side column and the middle column; or the projection of the air gap is located between the second side column and the middle column. Eddy current loss of the winding can be reduced, and the heating value of the transformer is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical equipment, in particular to a transformer. BACKGROUND

[0002] The transformer is an important component in electrical equipment, which is used to adjust different voltages so that the voltage reaches the range that the electrical equipment can adapt to, thereby enabling the electrical equipment to operate. With the continuous improvement of power density, a planar transformer can be used to reduce the volume.

[0003] In the related art, in order to prevent the magnetic core of the transformer from being saturated, an air gap needs to be formed on the transformer. The air gap can be formed on the center column of the transformer, so that there is a gap between the center column and the top wall.

[0004] However, after the air gap is formed on the transformer, the magnetic flux leaks at the position of the air gap. In the related art, the vertical component of the magnetic force line cuts more windings, the eddy current loss of the winding is large, and the transformer generates a large amount of heat. Utility model content

[0005] In order to overcome the above-mentioned defects in the related art, the purpose of the present application is to provide a transformer. In the present application, the vertical component of the magnetic force line cuts fewer windings, which is beneficial to reduce the eddy current loss of the winding and reduce the heat generation of the transformer.

[0006] The present application provides a transformer, which comprises a first magnetic core and a second magnetic core arranged opposite to each other along a first direction, a first side column, a center column and a second side column arranged in sequence and at intervals along a second direction, and a winding; along the first direction, two ends of the first side column, two ends of the center column and two ends of the second side column are connected to the first magnetic core and the second magnetic core respectively; a winding space is formed between the first side column and the center column and between the second side column and the center column, and the winding is wound on the center column and located in the winding space.

[0007] Among them, at least one air gap is formed on the first magnetic core or the second magnetic core, the air gap extends along a third direction, and penetrates the first magnetic core or the second magnetic core along the first direction; in a plane perpendicular to the first direction, the projection of the air gap is located between the first side column and the center column; or, the projection of the air gap is located between the second side column and the center column.

[0008] In one possible implementation, the air gap includes a first air gap and a second air gap, and in a plane perpendicular to the first direction, the projection of the first air gap is located between the first side column and the center column, and the projection of the second air gap is located between the second side column and the center column.

[0009] In a possible implementation, the air gap extends through the first magnetic core or the second magnetic core along a third direction.

[0010] In a possible implementation, the air gap further includes a third air gap and a fourth air gap, the third air gap and the fourth air gap extend along a second direction, and the first air gap, the third air gap, the second air gap, and the fourth air gap are sequentially connected in a head-tail manner.

[0011] In a possible implementation, a projection of the middle column in a plane perpendicular to the first direction is circular or track-shaped.

[0012] In a possible implementation, the winding includes a first secondary-side winding, a primary-side winding, and a second secondary-side winding, and the first secondary-side winding, the primary-side winding, and the second secondary-side winding are stacked along the first direction.

[0013] In a possible implementation, the first side column, the middle column, the second side column, and the second magnetic core are integrally formed.

[0014] In a possible implementation, the air gap is arranged on the first magnetic core.

[0015] In a possible implementation, the winding is placed close to the second magnetic core.

[0016] In a possible implementation, the air gap is arranged on the second magnetic core.

[0017] In a possible implementation, the winding is placed close to the first magnetic core.

[0018] In a possible implementation, the first magnetic core further includes a first side wall and a second side wall opposite to each other along the third direction, a first groove is formed on the first side wall between the first air gap and the second air gap, and the first groove is recessed toward the middle column; and a second groove is formed on the second side wall between the first air gap and the second air gap, and the second groove is recessed toward the middle column.

[0019] And / or, the second magnetic core further includes a third side wall and a fourth side wall opposite to each other along the third direction, a third groove is formed on the third side wall between the first air gap and the second air gap, and the third groove is recessed toward the middle column; and a fourth groove is formed on the fourth side wall between the first air gap and the second air gap, and the fourth groove is recessed toward the middle column.

[0020] The application provides a transformer, which comprises a first magnetic core and a second magnetic core arranged oppositely along a first direction, a first side column, a middle column and a second side column arranged sequentially and at intervals along a second direction, and a winding; along the first direction, two ends of the first side column, two ends of the middle column and two ends of the second side column are connected with the first magnetic core and the second magnetic core respectively; a winding space is formed between the first side column and the middle column and between the second side column and the middle column, and the winding is arranged on the middle column and located in the winding space; wherein at least one air gap is formed in the first magnetic core or the second magnetic core, the air gap extends along a third direction and penetrates the first magnetic core or the second magnetic core along the first direction; in a plane perpendicular to the first direction, a projection of the air gap is located between the first side column and the middle column; or a projection of the air gap is located between the second side column and the middle column. According to the application, the air gap is formed in the first magnetic core or the second magnetic core, the air gap is communicated with the winding space, and the air gap is located between the first side column and the middle column or between the second side column and the middle column, so that the magnetic force line passing through the air gap is substantially parallel to the winding, the perpendicular component of the magnetic force line cuts the winding less, the eddy current loss of the winding is reduced, and the heat generation of the transformer is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the application or the related art, the following will briefly introduce the drawings needed to be used in the embodiments or the related art description. Obviously, the drawings in the following description are some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0022] Figure 1 It is a partial schematic view of a transformer in the related art;

[0023] Figure 2 It is a partial schematic view of a transformer provided by an embodiment of the application;

[0024] Figure 3 It is a structural schematic view of a magnetic core provided by an embodiment of the application;

[0025] Figure 4 It is a structural schematic view of a magnetic core provided by another embodiment of the application;

[0026] Figure 5 It is a structural schematic view of a magnetic core provided by still another embodiment of the application;

[0027] Figure 6 It is a top view of Figure 5 ;

[0028] Figure 7 It is a structural schematic view of a magnetic core provided by still another embodiment of the application;

[0029] Figure 8 It is a structural schematic view of a magnetic core provided by still another embodiment of the application;Figure 7 Top view.

[0030] Figure label:

[0031] 110 - First magnetic core; 111 - First groove; 112 - Second groove; 120 - Second magnetic core; 121 - Third groove; 122 - Fourth groove; 130 - First side post; 140 - Middle post; 150 - Second side post; 160 - Winding space;

[0032] 200 - Winding; 210 - First secondary winding; 220 - Primary winding; 230 - Second secondary winding;

[0033] 300 - Air gap; 310 - First air gap; 320 - Second air gap; 330 - Third air gap; 340 - Fourth air gap;

[0034] X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0036] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0037] As described in the background section, in the related technical solutions, after the transformer has an air gap, the vertical component of the magnetic field lines cuts the winding more, resulting in large eddy current losses in the winding and causing the transformer to overheat severely.

[0038] Specifically Figure 1 This is a partial schematic diagram of a transformer in related technologies. For example... Figure 1 As shown, the transformer in the related technology includes a first magnetic core 110 and a second magnetic core 120 arranged opposite each other along a first direction X. A central column 140 and a first side column 130 are provided between the first magnetic core 110 and the second magnetic core 120. The two ends of the first side column 130 are respectively connected to the first magnetic core 110 and the second magnetic core 120. One end of the central column 140 is connected to the second magnetic core 120, and the other end of the central column 140 forms an air gap 300 with the first magnetic core 110. A winding 200 is provided in the winding space enclosed by the first magnetic core 110, the second magnetic core 120, the central column 140 and the first side column 130.

[0039] Figure 1The middle curve shows the distribution of the magnetic force lines, and it can be seen from the figure that the magnetic force lines are distributed in a circular manner. Figure 1 It can be seen that when the transformer is in use, the vertical (i.e. along the first direction X) component of the magnetic force lines cuts the winding 200 more, so the eddy current loss of the winding 200 is large, which causes the transformer to generate a large amount of heat.

[0040] Therefore, the embodiment of the present application aims to provide a transformer, by opening an air gap on the first magnetic core or the second magnetic core, the air gap is in communication with the winding space, and the air gap is located between the first side column and the middle column, or between the second side column and the middle column, so that the magnetic force lines passing through the air gap are substantially parallel to the winding, and the vertical component of the magnetic force lines cuts the winding less, which is beneficial to reduce the eddy current loss of the winding and reduce the heat generated by the transformer.

[0041] The content of the embodiment 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 embodiment of the present application, the first direction X, the second direction Y and the third direction Z are three different directions in a three-dimensional space, for example, the first direction X, the second direction Y and the third direction Z can be perpendicular to each other.

[0042] Figure 2 A partial schematic view of a transformer provided by an embodiment of the present application is shown in Figure 3 A structural schematic view of a magnetic core provided by an embodiment of the present application is shown in Figure 4 A structural schematic view of a magnetic core provided by another embodiment of the present application is shown in Figure 5 A structural schematic view of a magnetic core provided by still another embodiment of the present application is shown in Figure 6 A top view of Figure 5 is shown in Figure 7 A structural schematic view of a magnetic core provided by still another embodiment of the present application is shown in Figure 8 A top view of Figure 7 is shown in

[0043] Please refer to Figures 2-8 , the embodiment provides a transformer, which comprises a magnetic core and a winding 200, and the winding 200 is arranged in the magnetic core.

[0044] As shown in Figure 3 , Figure 4 , Figure 5 and Figure 7 , the magnetic core comprises a first magnetic core 110 and a second magnetic core 120 arranged opposite along a first direction X, and a first side column 130, a middle column 140 and a second side column 150 arranged in sequence and spaced apart along a second direction Y. In combination with Figure 2It can be seen that, along the first direction X, the two ends of the first side post 130, the two ends of the middle post 140, and the two ends of the second side post 150 are respectively connected to the first magnetic core 110 and the second magnetic core 120. A winding space 160 is formed between the first side post 130 and the middle post 140, and between the second side post 150 and the middle post 140. The winding 200 is wound on the middle post 140 and located within the winding space 160.

[0045] In this embodiment, at least one air gap 300 is formed on the first magnetic core 110 or the second magnetic core 120. The air gap 300 extends along the third direction Z and penetrates the first magnetic core 110 or the second magnetic core 120 along the first direction X. In a plane perpendicular to the first direction X, the projection of the air gap 300 is located between the first side post 130 and the middle post 140; or, the projection of the air gap 300 is located between the second side post 150 and the middle post 140, thereby ensuring that the air gap 300 can be connected to the winding space 160.

[0046] Figure 2 The curve in the middle shows the distribution of magnetic field lines, by Figure 2 As can be seen, when the transformer of this embodiment is used, the magnetic lines of force are generally parallel to the winding 200, and the perpendicular (i.e. along the first direction X) component of the magnetic lines of force cuts the winding 200 less. Therefore, the eddy current loss of the winding 200 is small, which is beneficial to reducing the heat generation of the transformer.

[0047] Table 1 Comparison of Transformer Losses

[0048] Transformer in the Related Art Figure 3 transformer Input voltage 90V / 60Hz 90V / 60Hz Primary winding: secondary winding 14:2 14:2 Operating frequency 176k 176k Inductance 120uH 120uH Primary winding loss 0.355W 0.321W Secondary winding loss 0.478W 0.253W Winding loss 0.833W 0.574W Core loss 0.436W 0.436W Total loss 1.269W 1.010W

[0049] Combination Figure 2 As shown in Table 1, under the same conditions and with the same transformer parameters, by changing the opening position of the air gap, the transformer in this embodiment reduces the winding loss by 0.259W compared to the transformer in the related technology, and the corresponding total loss is also reduced by 0.259W, which helps to reduce the heat generation of the transformer.

[0050] As described above, in this embodiment, by opening an air gap 300 on the first magnetic core 110 or the second magnetic core 120, the air gap 300 is connected to the winding space 160, and the air gap 300 is located between the first side post 130 and the middle post 140, or between the second side post 150 and the middle post 140, so that the magnetic lines of force passing through the air gap 300 are generally parallel to the winding 200, and the vertical component of the magnetic lines of force cuts the winding 200 less, which is beneficial to reduce the large eddy current loss of the winding 200 and reduce the heat generation of the transformer.

[0051] Please continue to refer to Figure 3 , Figure 4 , Figure 6 and Figure 8The air gap 300 in the embodiment includes a first air gap 310 and a second air gap 320. In a plane perpendicular to the first direction X, a projection of the first air gap 310 is located between the first side column 130 and the middle column 140, and a projection of the second air gap 320 is located between the second side column 150 and the middle column 140.

[0052] The embodiment can more accurately control the inductance and more effectively reduce the eddy current loss of the winding 200, improve the thermal stability of the transformer, and prolong the service life of the transformer by opening the first air gap 310 and the second air gap 320 on the first magnetic core 110 or the second magnetic core 120.

[0053] As shown in Figure 3 , Figure 4 and Figure 6 , in the embodiment, the air gap 300 extends through the first magnetic core 110 or the second magnetic core 120 along the third direction Z.

[0054] Through the above structure, the air gap 300 can have a longer length to adapt to the size of the winding space 160, thereby better reducing the eddy current loss of the winding 200 and reducing the heat generation of the transformer.

[0055] In some embodiments, in a plane perpendicular to the first direction X, the projection of the air gap 300 can be linear (as shown in Figure 3 , Figure 4 , Figure 6 and Figure 8 ). In other possible embodiments, in a plane perpendicular to the first direction X, the projection of the air gap 300 can also be circular arc-shaped, and the center of the arc of the air gap 300 faces the middle column 140. Compared with the linear air gap 300, the circular arc-shaped air gap 300 can improve the electromagnetic force and help to make the magnetic flux density in the transformer more uniform.

[0056] As shown in Figure 8 , in the embodiment, the air gap 300 further includes a third air gap 330 and a fourth air gap 340, the third air gap 330 and the fourth air gap 340 extend along the second direction Y, and the first air gap 310, the third air gap 330, the second air gap 320 and the fourth air gap 340 are sequentially connected in series to form a substantially square air gap 300.

[0057] Compared with the air gap structures shown in Figure 3 , Figure 4 and Figure 6 , the embodiment sets the air gap 300 to be square-shaped, which can improve the structural stability of the magnetic core and make the distribution of the magnetic field more uniform.

[0058] In the embodiment, the projection of the middle column 140 in the plane perpendicular to the first direction X can be circular or track-shaped. Preferably, the middle column 140 can adopt a track-shaped structure, so that the distribution of magnetic lines in the transformer is more optimal.

[0059] Please continue to refer to Figure 2 The winding 200 of the embodiment includes a first secondary winding 210, a primary winding 220 and a second secondary winding 230, and the first secondary winding 210, the primary winding 220 and the second secondary winding 230 are stacked along the first direction X. Exemplarily, the first secondary winding 210, the primary winding 220 and the second secondary winding 230 can be integrated on a circuit board, i.e., the first secondary winding 210, the primary winding 220 and the second secondary winding 230 are windings integrated on a circuit board, so that the volume of the winding 200 is small, which is conducive to improving the power density of the transformer.

[0060] In some possible implementation manners, the first side column 130, the middle column 140, the second side column 150 and the second magnetic core 120 of the embodiment are integrally formed.

[0061] The first side column 130, the middle column 140, the second side column 150 and the second magnetic core 120 are integrated in an integrally formed manner, which can improve production efficiency, reduce the number of parts, and improve the assembly efficiency of the transformer.

[0062] Please continue to refer to Figure 3 、 Figure 5 and Figure 7 In some possible implementation manners, the air gap 300 of the embodiment can be arranged on the first magnetic core 110. Correspondingly, the winding 200 is placed close to the second magnetic core 120.

[0063] With the above structure, the winding 200 can be away from the air gap 300 on the first magnetic core 110, so that the eddy current loss of the winding 200 can be further reduced, and the heat generation of the transformer can be reduced.

[0064] Specifically, during assembly, the winding 200 can be sleeved on the middle column 140 of the integrally formed first side column 130, middle column 140, second side column 150 and second magnetic core 120, and the winding 200 is tightly attached to the second magnetic core 120; then the first magnetic core 110 divided into multiple sections by the air gap 300 is placed in the corresponding mold for glue baking treatment; finally, the treated first magnetic core 110 is bonded and fixed with the first side column 130, the middle column 140 and the second side column 150, and the winding 200 is bonded and fixed with the second magnetic core 120.

[0065] Please continue to refer to Figure 4In some possible implementation manners, the air gap 300 is arranged on the second magnetic core 120. Correspondingly, the winding 200 is arranged close to the first magnetic core 110.

[0066] With the above structure, the winding 200 can be far away from the air gap 300 on the second magnetic core 120, so that the eddy current loss of the winding 200 can be further reduced, and the heat generation of the transformer can be reduced.

[0067] Specifically, during assembly, the second magnetic core 120, which is divided into three sections by the first air gap 310 and the second air gap 320, can be first placed in a corresponding mold for baking processing, where the three sections of the second magnetic core 120 are integrally formed with the first side column 130, the middle column 140 and the second side column 150 respectively. Then the winding 200 is bonded to the first magnetic core 110. Finally, the first magnetic core 110 is bonded and fixed with the first side column 130, the middle column 140 and the second side column 150, and the winding 200 is sleeved on the middle column 140.

[0068] Please continue to refer to Figure 6 In some possible implementation manners, the first magnetic core 110 of the embodiment further includes a first side wall and a second side wall opposite in the third direction Z. A first groove 111 is formed on the first side wall between the first air gap 310 and the second air gap 320 in the second direction Y, and the first groove 111 is recessed toward the middle column 140 in the third direction Z. A second groove 112 is formed on the second side wall between the first air gap 310 and the second air gap 320 in the second direction Y, and the second groove 112 is recessed toward the middle column 140 in the third direction Z.

[0069] In some possible implementation manners, the first magnetic core 110 of the embodiment further includes a first side wall and a second side wall opposite in the third direction Z. A first groove 111 is formed on the first side wall between the first air gap 310 and the second air gap 320 in the second direction Y, and the first groove 111 is recessed toward the middle column 140 in the third direction Z. A second groove 112 is formed on the second side wall between the first air gap 310 and the second air gap 320 in the second direction Y, and the second groove 112 is recessed toward the middle column 140 in the third direction Z.

[0070] Preferably, the bottom wall of the first groove 111, the bottom wall of the second groove 112, the bottom wall of the third groove 121 and the bottom wall of the fourth groove 122 are all circular arcs in the projection on the plane perpendicular to the first direction X.

[0071] In some possible implementation manners, the first magnetic core 110 of the embodiment further includes a first side wall and a second side wall opposite in the third direction Z. A first groove 111 is formed on the first side wall between the first air gap 310 and the second air gap 320 in the second direction Y, and the first groove 111 is recessed toward the middle column 140 in the third direction Z. A second groove 112 is formed on the second side wall between the first air gap 310 and the second air gap 320 in the second direction Y, and the second groove 112 is recessed toward the middle column 140 in the third direction Z. In some possible implementation manners, the first magnetic core 110 of the embodiment further includes a first side wall and a second side wall opposite in the third direction Z. A first groove 111 is formed on the first side wall between the first air gap 310 and the second air gap 320 in the second direction Y, and the first groove 111 is recessed toward the middle column 140 in the third direction Z. A second groove 112 is formed on the second side wall between the first air gap 310 and the second air gap 320 in the second direction Y, and the second groove 112 is recessed toward the middle column 140 in the third direction Z.

[0072] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which are for convenience of description and simplification of the description of the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0073] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0074] It should be noted that in the description of the present application, the terms "first", "second" are only used for the convenience of describing different parts, and cannot be understood as indicating or implying the order relationship, relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can include at least one of the features.

[0075] The embodiments or implementations in the present application are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the embodiments can be referred to each other.

[0076] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0077] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part 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 the present application.

Claims

1. A transformer, characterized in that, The device includes a first magnetic core and a second magnetic core arranged opposite each other along a first direction, a first side post, a middle post, and a second side post arranged at intervals along a second direction, and a winding; along the first direction, the two ends of the first side post, the two ends of the middle post, and the two ends of the second side post are respectively connected to the first magnetic core and the second magnetic core; a winding space is formed between the first side post and the middle post and between the second side post and the middle post, and the winding is wound on the middle post and located within the winding space; Wherein, at least one air gap is formed on the first magnetic core or the second magnetic core, the air gap extends along a third direction and penetrates the first magnetic core and / or the second magnetic core along the first direction; in a plane perpendicular to the first direction, the projection of the air gap is located between the first side post and the middle post; or, the projection of the air gap is located between the second side post and the middle post.

2. The transformer according to claim 1, characterized in that, The air gap includes a first air gap and a second air gap. In a plane perpendicular to the first direction, the projection of the first air gap is located between the first side post and the middle post, and the projection of the second air gap is located between the second side post and the middle post.

3. The transformer according to claim 1, characterized in that, The air gap penetrates the first magnetic core or the second magnetic core in a third direction.

4. The transformer according to claim 2, characterized in that, The air gap also includes a third air gap and a fourth air gap, which extend along a second direction, and the first air gap, the third air gap, the second air gap and the fourth air gap are connected end to end in sequence.

5. The transformer according to claim 1, characterized in that, In a plane perpendicular to the first direction, the projection of the central column is circular or racetrack-shaped.

6. The transformer according to claim 1, characterized in that, The winding includes a first secondary winding, a primary winding, and a second secondary winding, which are stacked along the first direction.

7. The transformer according to claim 1, characterized in that, The first side post, the middle post, the second side post, and the second magnetic core are integrally formed.

8. The transformer according to any one of claims 1-7, characterized in that, The air gap is located on the first magnetic core.

9. The transformer according to claim 8, characterized in that, The winding is placed close to the second magnetic core.

10. The transformer according to any one of claims 1-7, characterized in that, The air gap is located on the second magnetic core.

11. The transformer according to claim 10, characterized in that, The winding is placed close to the first magnetic core.

12. The transformer according to claim 2, characterized in that, The first magnetic core also includes a first sidewall and a second sidewall that are opposite each other along the third direction. A first groove is formed on the first sidewall located between the first air gap and the second air gap, and the first groove is recessed toward the central column. A second groove is formed on the second sidewall located between the first air gap and the second air gap, and the second groove is recessed toward the central column. And / or, the second magnetic core further includes a third sidewall and a fourth sidewall opposite to each other along the third direction, a third groove is formed on the third sidewall located between the first air gap and the second air gap, the third groove being recessed toward the central column; a fourth groove is formed on the fourth sidewall located between the first air gap and the second air gap, the fourth groove being recessed toward the central column.

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