Power main transformer structure

Abstract

Provided in the present invention is a power main transformer structure, comprising: a magnetic core, a first bobbin, a second bobbin, a primary winding and a secondary winding. The magnetic core comprises a magnetic column, the first bobbin and the second bobbin are sleeved on the magnetic column, and the first bobbin is sleeved on the outer side of the second bobbin. One of the primary winding and the secondary winding is wound around the first bobbin, and the other is wound around the second bobbin. The first bobbin and the second bobbin are spaced apart from each other. In the present application, the first bobbin and the second bobbin are sleeved on the magnetic column and are arranged in an overlapping manner, thereby ensuring higher energy transmission per unit turn compared with a non-overlapping arrangement, and also achieving lower magnetic flux leakage and higher precision and being suitable for various power levels. Since the first bobbin and the second bobbin are spaced apart from each other, the parasitic capacitance between the primary winding and the secondary winding is smaller, and the space can be used for heat dissipation and ventilation, thereby effectively reducing the problems of loss and power density caused by heat dissipation.

Description

Power main transformer structure TECHNICAL FIELD

[0001] The application belongs to the technical field of transformer equipment, and particularly relates to a power main transformer structure. BACKGROUND

[0002] The power main transformer structure is generally composed of a primary winding, a secondary winding and a magnetic core, and is essentially a transformer. In the design process, various problems such as insulation, heat dissipation and parasitic capacitance need to be considered.

[0003] Most of the existing power main transformer structures have the primary winding and the secondary winding arranged through the insulation medium to reduce the magnetic flux leakage phenomenon and improve the transmission energy as much as possible. However, the heat dissipation is difficult, the winding loss is high, and the parasitic capacitance is large. If the primary winding and the secondary winding are not arranged in close contact, the parasitic capacitance and the winding loss can be reduced, and the heat dissipation can also be reduced, but the coupling coefficient is poor, the secondary copper loss is large, and the transmission energy per turn is low, thereby limiting the power improvement. TECHNICAL PROBLEM

[0004] The technical purpose of the application is to provide a power main transformer structure which can improve the heat dissipation capacity of the power main transformer structure without amplifying other negative effects. TECHNICAL SOLUTION

[0005] To solve the above technical problems, the application is implemented as follows: a power main transformer structure comprises a magnetic core, a first skeleton, a second skeleton, a primary winding and a secondary winding.

[0006] The magnetic core comprises a magnetic column, the first skeleton and the second skeleton are sleeved on the magnetic column, and the first skeleton is sleeved on the outer side of the second skeleton.

[0007] One of the primary winding and the secondary winding is wound on the first skeleton, and the other is wound on the second skeleton.

[0008] The first skeleton and the second skeleton have a spacing.

[0009] In one embodiment, the magnetic column is provided with a limiting end at both ends, and the first skeleton and the second skeleton are limited and matched with the limiting end.

[0010] In one embodiment, the first skeleton is provided with a plurality of first limiting members at both ends, the plurality of first limiting members surround a first accommodating space, and along a first direction, the limiting end is located in the accommodating space and abuts against the first limiting member.

[0011] The second skeleton is provided with a plurality of second limiting members at both ends, the plurality of second limiting members surround a second accommodating space, and along a first direction, the limiting end is located in the accommodating space and abuts against the second limiting member; wherein the first direction is perpendicular to the length extension direction of the magnetic column.

[0012] In one of the embodiments, the magnetic column is provided with at least one groove extending along the length direction of the magnetic column and penetrating through the magnetic column, and the second skeleton is attached to the outer circumferential surface of the magnetic column to form the heat dissipation air duct together with the side wall of the groove.

[0013] In one of the embodiments, the second skeleton comprises an attachment surface and a heat dissipation surface, the attachment surface and the heat dissipation surface are connected head to tail, the heat dissipation surface and the side wall of the groove form the heat dissipation air duct, and the heat dissipation surface is hollow.

[0014] In one of the embodiments, the magnetic column is provided with a limiting end at each end, the outer circumferential surface of the limiting end comprises a limiting surface, the limiting surface is coplanar with the side wall of the groove, the first limiting member extends along the outer circumferential surface of the end surface of the first skeleton, and the two ends of the first limiting member are bent to form first limiting sheets, and the bending angle of the first limiting sheets is the same as the angle of the limiting surface.

[0015] The second limiting member extends along the outer circumferential surface of the end surface of the second skeleton, and the two ends of the second limiting member are bent to form second limiting sheets, and the bending angle of the second limiting sheets is the same as the angle of the limiting surface.

[0016] In one of the embodiments, the magnetic core further comprises a side column, one end of the side column is fixedly connected with the limiting end, the extension direction of the side column is the same as the length direction of the magnetic column, and the side column is arranged in the radial direction of the magnetic column, and the first skeleton and the second skeleton are located in the accommodating cavity.

[0017] In one of the embodiments, one end of the second skeleton is provided with a connecting member, the connecting member is fixedly connected with the second skeleton and extends towards the first skeleton, and the connecting member is detachably connected with the first skeleton.

[0018] In one of the embodiments, the first skeleton is hollow.

[0019] In one of the embodiments, the inner wall of the first skeleton is provided with a reinforcing rib protruding inwardly and extending along the length direction of the first skeleton, and the reinforcing rib has a minimum distance, and along the radial direction of the first skeleton, the length of the reinforcing rib is greater than the minimum distance. Advantages

[0020] Compared with the prior art, the power main transformer structure has the advantages that the first skeleton and the second skeleton are sleeved on the magnetic column and are arranged in overlap, so that the transmission energy per turn number is higher than that of the non-overlap arrangement, the magnetic flux leakage is small, the precision is high, and the structure is suitable for various power levels. The first skeleton and the second skeleton have a spacing, so that the parasitic capacitance between the primary winding and the secondary winding is smaller, and the spacing is used for heat dissipation and ventilation, so that the loss problem and the power density problem caused by heat dissipation can be effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 is a schematic diagram of the overall structure of the power main transformer structure;

[0022] Fig. 2 is a structural schematic diagram of the first skeleton and the second skeleton;

[0023] Fig. 3 is a top view of the power transformer structure;

[0024] Fig. 4 is a structural schematic diagram of the magnetic core.

[0025] In the drawings, the reference signs represent: the magnetic core 100; the magnetic column 110; the curved segment 111; the straight segment 112; the limiting end 120; the limiting surface 121; the heat dissipation air duct 130; the side column 140; the first skeleton 200; the first limiting piece 210; the first limiting sheet 211; the reinforcing rib 220; the second skeleton 300; the second limiting piece 310; the second limiting sheet 311; the connecting piece 320; the primary winding 400; the secondary winding 500. Embodiment of the application

[0026] The embodiments of the application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application, and all other embodiments obtained by those skilled in the art based on the embodiments in the present application without creative labor fall within the scope of protection of the present application.

[0027] In the description of the present application, it should be understood that the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, “axial”, “circumferential”, “radial” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying 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.

[0028] In addition, the terms “first” and “second” are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features defined with “first” and “second” can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of “a plurality of” is two or more, unless otherwise specifically limited.

[0029] Referring to FIG. 1 and FIG. 2, FIG. 1 shows a structural schematic diagram of a power transformer structure, and FIG. 2 shows a structural schematic diagram of a first skeleton 200 and a second skeleton 300. In one embodiment, the present application provides a power transformer structure, mainly comprising a magnetic core 100, the first skeleton 200, the second skeleton 300, a primary winding 400 and a secondary winding 500. The magnetic core 100 comprises a magnetic column 110, the first skeleton 200 and the second skeleton 300 are sleeved on the magnetic column 110, and the first skeleton 200 is sleeved outside the second skeleton 300. One of the primary winding 400 and the secondary winding 500 is wound on the first skeleton 200, and the other is wound on the second skeleton 300. The first skeleton 200 and the second skeleton 300 have a gap.

[0030] The power transformer structure in the present application has the following advantages compared with the prior art: the first skeleton 200 and the second skeleton 300 are sleeved on the magnetic column 110 and are arranged in an overlapping manner, which can ensure that the transmission energy per turn number is higher than that of a non-overlapping arrangement, and at the same time, the leakage magnetic flux is smaller, the precision is higher, and it is suitable for various power levels. The first skeleton 200 and the second skeleton 300 have a gap, so that the parasitic capacitance between the primary winding 400 and the secondary winding 500 is smaller, the common-mode path impedance of the primary winding 400 and the secondary winding 500 is larger, the EMI performance is better, and the gap can form a magnetic flux leakage channel and form a parasitic inductance, effectively reducing the demand for external resonant inductance. At the same time, the gap is used for heat dissipation and ventilation, which can effectively reduce the loss problem and power density problem caused by heat dissipation.

[0031] In the power transformer structure provided by the present application, the gap distance between the first skeleton 200 and the second skeleton 300 is determined comprehensively according to the parasitic capacitance demand, the leakage inductance demand and the voltage withstand capability. From the capacitance demand, the following formula can be used to determine the gap distance:

[0032] wherein d 空1 is the distance between the primary winding 400 and the secondary winding 500, ε 空 is the air dielectric constant, ε 介 is the dielectric constant of the insulating medium, Sps is the overlapping distance of the primary winding 400 and the secondary winding 500, and Cps is the parasitic equivalent capacitance of the primary winding 400 and the secondary winding 500.

[0033] From the leakage inductance demand, the gap distance formula is as follows:

[0034] wherein d 空2 is the air distance between the primary winding 400 and the secondary winding 500, L k is the parasitic leakage inductance, h is the transformer window height, μ0 is the air permeability, and N is the number of turns of the transformer.

[0035] From the insulation withstand voltage point of view, the spacing distance formula is as follows:

[0036] d 空2

[0037] Wherein, d 空3 is the air distance between the primary winding 400 and the secondary winding 500, U is the voltage applied to the air gap, and E is the maximum field strength allowed by the air.

[0038] In the scheme, the size of the second skeleton 300 is controlled by the size of the magnetic column 110, and the difference between the equivalent inner diameter size d1 of the first skeleton 200 and the small skeleton outer diameter d2 is equal to the air distance designed between the primary winding 400 and the secondary winding 500, plus the thickness D of the winding wound on the second skeleton 300, and the formula is as follows: d2=d1+D+d 空

[0039] Wherein d 空 is equal to d 空1 , d 空2 , d 空3 , one of them, in fact, is defined according to the demand.

[0040] By associating the magnetic core 100 structure, the skeleton structure, and the actual design parameters, the magnetic core 100 structure and the skeleton structure are determined together. The magnetic core 100 is used to fix the first skeleton 200 and the second skeleton 300, and the first skeleton 200 and the first skeleton 200 together provide a heat dissipation cavity for the magnetic core 100 and the winding, and are coupled with each other, while solving the fixing and heat dissipation functions, realizing the flexible adjustment of the parasitic parameters and the heat dissipation capacity of the entire magnetic device according to the actual design requirements.

[0041] The magnetic core 100 in the scheme, and the primary winding 400 and the secondary winding 500 can be wound on different skeletons, and since they are directly detachable from each other, they can be operated separately, which is helpful for pipeline processing and improves processing speed at the manufacturing level. At the same time, it can also improve the insulation problem caused by the interleaved winding of the primary winding 400 and the secondary winding 500, which is helpful for the reliability of the magnetic device, so that automatic equipment can be used to process the winding. At the same time, the primary winding 400 and the secondary winding 500 are wound separately, and the distance between the primary winding 400 and the secondary winding 500 can be selected according to the actual design requirements of parasitic capacitance, parasitic inductance, and insulation withstand voltage. Customized parasitic inductance and parasitic capacitance can meet the high voltage requirement while meeting the heat dissipation problem of the primary winding 400 and the secondary winding 500. The scheme can make the magnetic device realize higher power density, higher reliability, higher processing speed, higher voltage requirement, and better EMI performance, while integrating part of the resonant inductance function as needed.

[0042] The first skeleton 200 and the second skeleton 300 in the application are in a cylindrical shape, the diameter of the first skeleton 200 is larger than that of the second skeleton 300, so the first skeleton 200 can be sleeved outside the second skeleton 300, meanwhile, either one of the first skeleton 200 and the second skeleton 300 can be used as a primary skeleton, and the other one is a secondary skeleton, in the drawings, the primary winding 400 is wound on the first skeleton, and the secondary winding 400 is wound on the second skeleton 300. The number of turns of the primary winding 400 and the secondary winding 500 can be determined according to specific requirements. The stability of the interval between the first skeleton 200 and the second skeleton 300 can be ensured by fixedly connecting the first skeleton 200 and the second skeleton 300, which can be directly connected or indirectly connected, and the application adopts an indirect connection mode.

[0043] Specifically, referring to FIG. 1, in one embodiment, the first skeleton 200 and the second skeleton 300 are fixed by the magnetic core 100, so as to ensure the stability of the interval between the two. In one embodiment, the magnetic column 110 is provided with a limiting end 120 at both ends, and the first skeleton 200 and the second skeleton 300 are limitedly matched with the limiting end 120. Specifically, the first skeleton 200 is provided with a plurality of first limiting members 210 at both ends, and the plurality of first limiting members 210 surround a first accommodating space, along a first direction, the limiting end 120 is located in the accommodating space and abuts against the first limiting member 210. The second skeleton 300 is provided with a plurality of second limiting members 310 at both ends, and the plurality of second limiting members 310 surround a second accommodating space, along the first direction, the limiting end 120 is located in the accommodating space and abuts against the second limiting member 310; wherein the first direction is perpendicular to the length extension direction of the magnetic column 110.

[0044] As can be seen from FIG. 1, the first limiting member 210 of the first skeleton 200 and the second limiting member 310 of the second skeleton 300 sandwich the limiting end 120 of the magnetic core 100, and the first skeleton 200 and the second skeleton 300 are limited in space by the limiting end 120, so as to be relatively fixedly connected. Thus, the stability of the interval is ensured.

[0045] The assembly sequence of the magnetic device in the application is that the primary winding 400 and the secondary winding 500 are wound on the corresponding first skeleton 200 and second skeleton 300 respectively, the primary winding 400 and the secondary winding 500 can be operated separately, then the winding of the second skeleton 300 is assembled to the magnetic column 110, and then the first skeleton 200 is assembled to the magnetic column 110 and fixed on the magnetic column 110 by the first limiting member 210 and the second limiting member 310, so as to ensure that the relative position of the first skeleton 200 and the second skeleton 300 is the design position.

[0046] In some other embodiments, the first skeleton 200 and the second skeleton 300 can also be directly fixedly connected. Referring to FIG. 2, one end of the second skeleton 300 is provided with a connecting piece 320, which is fixedly connected with the second skeleton 300 and extends towards the first skeleton 200. The connecting piece 320 is detachably connected with the first skeleton 200. When the second skeleton 300 is not provided with the second limiting piece 310, the two ends of the second skeleton 300 can be respectively provided with the connecting piece 320, so as to fixedly connect the second skeleton 300 and the first skeleton 200, and to realize the fixed connection with the magnetic core 100 through the first connecting piece 320 of the first skeleton 200.

[0047] Referring to FIG. 3 and FIG. 4, FIG. 3 shows a top view of the power transformer structure, and FIG. 4 shows a structure diagram of the magnetic column 110. In one embodiment, the magnetic column 110 is provided with at least one groove. In the present embodiment, two grooves are provided and the two grooves are symmetrical along the half section of the magnetic column 110. Specifically, the outer circumferential surface of the magnetic column 110 includes a curved segment 111 and a straight segment 112. The second skeleton 300 is attached to the curved segment 111. The straight segment 112 is inclined towards the center of the magnetic column 110. The sides of the magnetic column 110 on which the two straight segments 112 are located form the grooves. The first skeleton 200 and the grooves surround to form a heat dissipation air duct 130, so as to improve the heat dissipation capacity of the entire power transformer structure. In the present embodiment, the magnetic column 110 is a cylinder. Two fan-shaped notches are formed on the symmetrical two sides. The straight segments 112 are two radii of the fan-shaped notches. However, the radii here are not the radii of the magnetic column 110 itself, because the top angle of the fan-shaped notch cannot be the axis of the magnetic column 110.

[0048] In other embodiments, the magnetic column 110 can have other shapes, such as a rectangular or other polygonal prism. The grooves are not necessarily fan-shaped. As long as the cavity is formed between the first skeleton 200 and the magnetic column 110 to facilitate heat dissipation, without affecting the relative position of the first skeleton 200 and the magnetic column 110 and the magnetic size of the magnetic column 110 itself.

[0049] Preferably, referring to FIG. 2 and FIG. 4, in one embodiment, due to the existence of the grooves, the side surface of the second skeleton 300 is naturally divided into an attaching surface and a heat dissipation surface. The attaching surface is attached to the magnetic column 110, and the heat dissipation surface and the side wall of the groove surround to form the heat dissipation air duct 130. In the present embodiment, the heat dissipation surface is provided with a hollow structure, which can facilitate the heat dissipation of the primary winding 400 or the secondary winding 500 wound on the first skeleton 200. Similarly, due to the interval between the first skeleton 200 and the second skeleton 300, the second skeleton 300 can also be provided with a hollow structure. Different from the first skeleton 200, only the heat dissipation surface of the second skeleton 300 is provided with a hollow structure. Since the second skeleton 300 and the first skeleton 200 have an interval in the range of 360° of the outer circumferential surface, the second skeleton 300 can be provided with a full hollow structure, so as to make the heat transfer more smooth and the heat dissipation effect more excellent.

[0050] Referring to FIG. 1 and FIG. 4, in one embodiment, the outer circumferential surface of the limiting end 120 comprises a limiting surface 121, the straight section 112 of the outer circumferential surface of the magnetic column 110 is arranged coplanarly with the limiting surface 121, and the first limiting member 210 and the second limiting member 310 are both attached to the limiting surface 121. The coplanar arrangement does not block the two ends of the heat dissipation air duct 130, which is conducive to heat dissipation. At the same time, since the outer circumferential surface of the limiting end 120 passes through a plane, the first limiting member 210 of the first skeleton 200 and the second limiting member 310 of the second skeleton 300 are more easily arranged to attach to the limiting surface 121.

[0051] In the above embodiment, the cross section of the groove is a sector, so that the side of the limiting end 120 is similar to an "X" shape. When the cross section of the groove is another shape, the limiting surface 121 of the limiting end 120 can be adjusted accordingly, so that the heat dissipation air duct can pass through the magnetic column 110 and the limiting end 120. This not only facilitates heat dissipation, but also ensures that the diameter of the first skeleton 200 and the second skeleton 300 is greater than the minimum distance between the sides of the limiting end 120, so that the first limiting member 210 and the second limiting member 310 can be clamped on both sides of the limiting end 120, thereby stabilizing the relative position of the first skeleton 200 and the second skeleton 300.

[0052] Preferably, in one embodiment, the first limiting member 210 and the second limiting member 310 have the same structure. Referring to FIG. 2, the first limiting member 210 extends along the outer circumferential surface of the end surface of the first skeleton 200, and the two ends of the first limiting member 210 are bent to form first limiting pieces 211, the bending angle of the first limiting pieces 211 being the same as the angle of the limiting surface 121. The second limiting member 310 extends along the outer circumferential surface of the end surface of the second skeleton 300, and the two ends of the second limiting member 310 are bent to form second limiting pieces 311, the bending angle of the second limiting pieces 311 being the same as the angle of the limiting surface 121. When the limiting surface 121 is a straight line, the first limiting pieces 211 and the second limiting pieces 311 are also straight lines. When the limiting surface 121 is a curve, the first limiting member 210 and the second limiting member 310 are also arranged in a curve to better fix the position of the first skeleton 200 and the second skeleton 300.

[0053] As can be seen from FIG. 2, since the diameter of the first skeleton 200 is larger than that of the second skeleton 300, the first limiting pieces 211 are more inclined to the outside of the limiting surface 121 than the second limiting pieces 311, and the circumferential length of the first limiting member 210 is longer than that of the second limiting member 310.

[0054] Referring to Fig. 4, in one embodiment, the magnetic core 100 further comprises side posts 140, specifically, the limiting end 120 is provided with four sides, two opposite sides are limiting surfaces 121, and the other two sides are used to fixedly connect the side posts 140. The side posts 140 are arranged at intervals with the magnetic posts 110, and the limiting end 120 and the magnetic posts 110 surround a receiving cavity in which the first skeleton 200 and the second skeleton 300 are located. The side posts 140 mainly serve to protect the second skeleton 300 and the winding wound on the second skeleton 300.

[0055] Preferably, in other embodiments, the side posts 140 can be arranged around the limiting end 120 to achieve better protection. At this time, a plurality of through holes are arranged on the limiting end 120 to communicate with the heat dissipation air duct 130, and the side walls of the through holes are used to fix the first skeleton 200 and the second skeleton 300. However, compared with the above-mentioned embodiment in which only two ends are provided with the side posts 140, the heat dissipation capacity is slightly insufficient.

[0056] Referring to Fig. 2, in one embodiment, the inner wall of the first skeleton 200 is provided with a reinforcing rib 220 protruding inward and extending along the length direction of the first skeleton 200. The reinforcing rib 220 can first increase the structural strength of the first skeleton 200, and secondly can be used to determine the minimum distance of the interval. The minimum distance changes according to the specific requirements of the power transformer structure and the material parameters. Generally, it refers to the air breakdown thickness corresponding to the minimum common-mode voltage between the primary winding 400 and the secondary winding 500. Preferably, the reinforcing rib 220 is provided with a plurality of reinforcing ribs 220 and is uniformly distributed on the inner wall of the first skeleton 200 in the circumferential direction. For example, six reinforcing ribs 220 are arranged, and the interval angle between two adjacent reinforcing ribs 220 is 60°.

[0057] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A power transformer structure, characterized by The utility model relates to a transformer, including: A magnetic core (100), a first skeleton (200), a second skeleton (300), a primary winding (400) and a secondary winding (500); The magnetic core (100) includes a magnetic column (110), the first skeleton (200) and the second skeleton (300) are set on the magnetic column (110), and the first skeleton (200) is set on the outside of the second skeleton (300); One of the primary winding (400) and the secondary winding (500) is wound on the first skeleton (200), and the other is wound on the second skeleton (300); The first skeleton (200) and the second skeleton (300) have a spacing.

2. The power transformer structure of claim 1, wherein, The magnetic column (110) is provided with a limiting end (120) at both ends, and the first skeleton (200) and the second skeleton (300) are limitedly matched with the limiting end (120).

3. The power transformer structure of claim 2, wherein, The first skeleton (200) is provided with a plurality of first limiting pieces (210) at both ends, and a plurality of first limiting pieces (210) surround a first containing space, and along a first direction, the limiting end (120) is located in the containing space and abuts against the first limiting piece (210); The second skeleton (300) is provided with a plurality of second limiting pieces (310) at both ends, and a plurality of second limiting pieces (310) surround a second containing space, and along a first direction, the limiting end (120) is located in the containing space and abuts against the second limiting piece (310); wherein, the first direction is perpendicular to the length extension direction of the magnetic column (110).

4. The power transformer structure of claim 3, wherein, The magnetic column (110) is provided with at least one groove, the groove extends along the length direction of the magnetic column (110) and penetrates through the magnetic column (110), and the second skeleton (300) abuts against the outer circumferential surface of the magnetic column (110) to form a heat dissipation air duct (130) with the side wall of the groove.

5. The power transformer structure of claim 4, wherein, The second skeleton (300) includes an abutting surface and a heat dissipation surface, the abutting surface and the heat dissipation surface are connected head to tail, the heat dissipation surface and the side wall of the groove surround to form a heat dissipation air duct (130), and the heat dissipation surface is hollowly arranged.

6. The power transformer structure of claim 4, wherein, The outer circumferential surface of the limiting end (120) includes a limiting surface (121), the limiting surface (121) and the side wall of the groove are arranged in the same plane, the first limiting piece (210) extends along the outer circumferential surface of the end surface of the first skeleton (200), and the two ends of the first limiting piece (210) are bent to form a first limiting sheet (211), and the bending angle of the first limiting sheet (211) is the same as the angle of the limiting surface (121); The second limiting piece (310) extends along the outer circumferential surface of the end surface of the second skeleton (300), and the two ends of the second limiting piece (310) are bent to form a second limiting sheet (311), and the bending angle of the second limiting sheet (311) is the same as the angle of the limiting surface (121).

7. The power transformer structure according to any of claims 1-6, characterized in that The magnetic core (100) further comprises a side column (140), one end of the side column (140) is fixedly connected with the limiting end (120), the extension direction of the side column (140) is the same as the length direction of the magnetic column (110), and the side column (140) is arranged in the radial direction of the magnetic column (110) and is spaced from the magnetic column (110), and the first framework (200) and the second framework (300) are located in the accommodating cavity.

8. The power transformer structure according to any of claims 1-6, characterized in that One end of the second framework (300) is provided with a connecting piece (320), the connecting piece (320) is fixedly connected with the second framework (300) and extends outwards to the first framework (200), and the connecting piece (320) is detachably connected with the first framework (200).

9. The power transformer structure according to any of claims 1-6, characterized in that The first framework (200) is hollow.

10. The power transformer structure of any of claims 1-6, wherein, The inner wall of the first framework (200) is provided with a reinforcing rib (220) protruding inwards and extending along the length direction of the first framework (200), the interval has a minimum distance, along the radial direction of the first framework (200), the length of the reinforcing rib (220) is greater than the minimum distance.

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