A leakage inductance magnetic integration structure capable of reducing eddy current loss

Abstract

This application provides a leakage inductance magnetic integrated structure that can reduce eddy current losses, comprising: a magnetic core assembly fixed above a base; the first and second magnetic cores having U-shaped cross-sections and being arranged opposite each other, forming a hollow accommodating cavity in the middle; a frame located above the base and built into the accommodating cavity; a winding including a primary winding and a secondary winding, the primary winding being formed by multiple sets of primary windings wound on the frame, and the secondary winding being formed by multiple sets of secondary windings wound on the frame; both the primary and secondary windings are film-wrapped wires, and the primary and secondary windings are arranged in an alternating winding configuration; two adjusting magnetic plates built into the accommodating cavity and located between the primary and secondary windings respectively; a low-voltage copper busbar located outside the windings, at least partially covering the top and outer surfaces of the windings, with the lower end of the low-voltage copper busbar connected to the base and extending from below the base. This application can effectively reduce eddy current losses and leakage inductance, improving the overall performance of magnetic components.

Description

Technical Field

[0001] This application belongs to the field of magnetic components technology, and more specifically, relates to a leakage inductance magnetic integrated structure that can reduce eddy current losses. Background Technology

[0002] In modern power electronic systems, magnetic components such as transformers and inductors are widely used in power conversion and power transmission. Among them, leakage inductance and eddy current loss are key factors affecting the performance of magnetic components. Leakage inductance can lead to problems such as voltage spikes, increased power loss, and increased stress on switching devices; while eddy current loss can cause severe heating of magnetic components, reduce system efficiency, and limit the improvement of power density of equipment.

[0003] Currently, traditional methods for reducing leakage inductance and eddy current losses have many shortcomings. For example, adjusting leakage inductance by increasing the air gap leads to increased core reluctance and excitation current, which in turn increases copper and iron losses. While multi-winding layered winding can improve leakage inductance distribution to some extent, it increases coupling capacitance between windings, introduces new electromagnetic interference problems, and has limited effect on suppressing eddy current losses. Furthermore, existing magnetic integration schemes struggle to reduce leakage inductance and eddy current losses while ensuring the reliability and stability of magnetic components, failing to meet the growing demands for high efficiency and miniaturization in modern power electronic equipment. Therefore, a new magnetic integration scheme is urgently needed to effectively reduce eddy current losses and leakage inductance and improve the overall performance of magnetic components. Utility Model Content

[0004] The purpose of this application is to provide a leakage inductance magnetic integrated structure that can reduce eddy current losses, so as to solve the above-mentioned technical problems existing in the prior art.

[0005] To achieve the above objectives, the technical solution adopted in this application is: to provide a leakage inductor magnetic integrated structure that can reduce eddy current losses for use in magnetic components, the leakage inductor magnetic integrated structure that can reduce eddy current losses includes:

[0006] Base

[0007] The magnetic core assembly is fixed above the base. The magnetic core assembly includes a first magnetic core, a second magnetic core, and two adjusting magnetic plates. The first magnetic core and the second magnetic core have U-shaped cross sections and are arranged opposite to each other, forming a hollow accommodating cavity in the middle.

[0008] The skeleton is located above the base and is built into the receiving cavity;

[0009] The winding includes a primary winding and a secondary winding. The primary winding is formed by multiple sets of primary windings wound on a bobbin, and the secondary winding is formed by multiple sets of secondary windings wound on the bobbin. Both the primary and secondary windings are film-wrapped wires, and the primary and secondary windings are arranged in an alternating configuration. Two adjusting magnetic plates are built into the accommodating cavity and are located between the primary and secondary windings, respectively.

[0010] The low-voltage copper busbar is located on the outside of the winding, at least partially covering the top and outer sides of the winding. The connecting feet at the lower end of the low-voltage copper busbar are connected to the base and extend from below the base.

[0011] Optionally, the first magnetic core and the second magnetic core are arranged opposite each other in the front-to-back direction; the frame includes two sub-frames arranged opposite each other in the front-to-back direction;

[0012] The primary winding includes four sets of primary windings, with one primary winding wound on each of the left and right sides of each sub-frame; the secondary winding includes two sets of secondary windings, with one primary winding wound in the middle of each sub-frame; on each sub-frame, the left and right sides of the secondary windings are partially staggered with the corresponding primary windings.

[0013] Optionally, each sub-frame has a wire-fixing groove at its upper and lower ends for securing the primary and secondary windings, and multiple wire-fixing grooves in the partially staggered winding area of ​​the secondary and primary windings are arranged to intersect and be partially connected.

[0014] Optionally, in the left region of the sub-frame, the gap between the outer ends of each coil of the primary winding gradually increases to the right; in the right region of the sub-frame, the gap between the outer ends of each coil of the primary winding gradually increases to the left.

[0015] The gap between the outer ends of each coil in the secondary winding is set such that it gradually increases from the center along the left and right directions.

[0016] Optionally, the two sub-frames, four sets of primary windings, and two sets of secondary windings are all arranged symmetrically along the central axis in the left-right direction.

[0017] Optionally, the two free ends of the primary winding of the primary side extend out of the base to form two first pins, and the two free ends of the secondary winding of the secondary side extend out of the base to form two second pins.

[0018] Optionally, both adjusting magnetic sheets are long sheets with a rectangular cross-section. The two adjusting magnetic sheets are arranged at intervals along the left and right direction. Each adjusting magnetic sheet is located between two sub-frames and between the primary winding and the secondary winding on the same side.

[0019] Optionally, the base is provided with two positioning posts, each of which corresponds to the position of an adjusting magnetic piece. The positioning posts are provided with positioning slots, and the lower end of the adjusting magnetic piece is engaged in the positioning slots.

[0020] Optionally, the low-voltage copper busbar includes two upper copper busbars and two lower copper busbars; the two upper copper busbars are arranged opposite each other, each upper copper busbar includes a vertical side plate and a top plate extending horizontally from the top of the side plate, the top plate located on the front side extends backward, the top plate located on the rear side extends forward, and there is a gap between the two top plates; the two sheet-like lower copper busbars are arranged on the base and spaced apart in the left-right direction.

[0021] Optionally, the connecting pins include a first connecting pin, a second connecting pin, a third connecting pin, a fourth connecting pin, a fifth connecting pin, and a sixth connecting pin; the lower end of the side plate of the upper copper busbar located on the front side is provided with a downwardly extending first connecting pin, and the rear end of the top plate is provided with a downwardly extending second connecting pin; the lower end of the side plate of the upper copper busbar located on the rear side is provided with a downwardly extending third connecting pin, and the front end of the top plate is provided with a downwardly extending fourth connecting pin; the outer edge of the lower copper busbar located on the left side is provided with a downwardly extending fifth connecting pin, and the outer edge of the lower copper busbar located on the right side is provided with a downwardly extending sixth connecting pin;

[0022] The base has multiple through holes, and the first connecting foot, second connecting foot, third connecting foot, fourth connecting foot, fifth connecting foot and sixth connecting foot are respectively inserted into the through holes at their corresponding positions.

[0023] The beneficial effects of the leakage inductor magnetic integrated structure for reducing eddy current losses provided in this application are as follows: First, through the skeleton design and the staggered winding arrangement between the primary and secondary windings, the external leakage magnetic field can be canceled, reducing the relatively large eddy current losses generated on the low-voltage copper busbar, solving the defects of the prior art, improving the efficiency and power density of power electronic equipment, and making it more conducive to the use of various leakage inductance sizes in LLC (Inductor-Inductor-Capacitor, two inductors and one capacitor). At the same time, both the primary and secondary windings use film-wrapped wires to form the primary and secondary windings respectively, thereby avoiding the problem of inter-turn short circuits between windings, which has the advantages of both material safety and reliability, and meeting performance requirements. Second, by adding an adjusting magnetic sheet between the primary and secondary windings, flexible and precise control of the leakage inductance size can be achieved, making it more flexible as a resonant inductor in LLC circuits. The resonant inductor adopts a leakage inductor magnetic integrated solution, that is, the resonant inductor is integrated on the device, thereby reducing the product size, material cost, and material cost, and making it more conducive to the use of various leakage inductance sizes in LLC circuits. In summary, the leakage inductance integrated structure that can reduce eddy current losses can be used to optimize the performance of magnetic components such as transformers and inductors, and improve the efficiency and power density of power electronic devices. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the leakage inductor magnetic integrated structure that can reduce eddy current losses according to an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the leakage inductor magnetic integrated structure that can reduce eddy current losses, provided in an embodiment of this application, from another angle.

[0027] Figure 3 A schematic diagram of the leakage inductor magnetic integrated structure for reducing eddy current losses provided in this application embodiment after removing the low-voltage copper busbar;

[0028] Figure 4 A top view of an integrated leakage inductor structure that reduces eddy current losses, provided in an embodiment of this application.

[0029] Figure 5 for Figure 4 A sectional view along the SS direction;

[0030] Figure 6 An exploded view of an angle of the leakage inductor magnetic integrated structure that can reduce eddy current losses provided in the embodiments of this application;

[0031] Figure 7 for Figure 6 Enlarged view of point A in the middle;

[0032] Figure 8 An exploded view from another angle of the leakage inductance magnetic integrated structure that can reduce eddy current losses provided in the embodiments of this application.

[0033] Explanation of icon numbers:

[0034]

[0035] Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. The preferred embodiments of this utility model will now be described in more detail with reference to the accompanying drawings. Although the preferred embodiments of this utility model are shown in the drawings, it should be understood that this utility model can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this utility model more thorough and complete, and to fully convey the scope of this utility model to those skilled in the art.

[0037] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0038] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0039] In the description of this utility model, it should be understood that the terms "thickness", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] It should be understood that although the terms "first," "second," "third," etc., may be used to describe various components in this invention, this information should not be limited to these terms. These terms are only used to distinguish components of the same type from each other. For example, without departing from the scope of this invention, a first component may also be referred to as a second component, and similarly, a second component may also be referred to as a first component. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] The technical solutions of the embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0043] Please see Figures 1 to 8 In one embodiment, the leakage inductance integrated structure that reduces eddy current losses is used for a magnetic element, including a base 100, a core assembly 200, a frame 300, a winding 400, and a low-voltage copper busbar 500. Specifically, the core assembly 200 is fixed above the base 100 and includes a first core 210, a second core 220, and two adjusting magnetic plates 230; the first core 210 and the second core 220 both have U-shaped cross-sections and are arranged opposite to each other, forming a hollow accommodating cavity in the middle. The frame 300 is located above the base 100 and is built into the accommodating cavity. The winding 400 includes a primary winding 410 and a secondary winding 420. The primary winding 410 is formed by multiple sets of primary windings 411 wound around the frame 300, and the secondary winding 420 is formed by multiple sets of secondary windings 421 wound around the frame 300. Both the primary windings 411 and the secondary windings 421 are film-wrapped wires, and the primary windings 411 and the secondary windings 421 are arranged in an alternating winding configuration. Two adjusting magnetic plates 230 are built into the accommodating cavity and are located between the primary windings 411 and the secondary windings 421, respectively. The low-voltage copper busbar 500 is located outside the winding 400, at least partially covering the top and outer surfaces of the winding 400. The bottom connecting foot of the low-voltage copper busbar 500 is connected to the base 100 and extends from below the base 100.

[0044] Based on this design, in this embodiment, firstly, by designing the skeleton 300 and setting the staggered windings between the primary winding 411 and the secondary winding 421, the external leakage magnetic field can be offset, reducing the relatively large eddy current loss generated on the low-voltage copper busbar 500, solving the defects of the existing technology, improving the efficiency and power density of power electronic equipment, and making it more conducive to the use of various leakage inductance modes of LLC (Inductor-Inductor-Capacitor, two inductors and one capacitor); at the same time, both the primary winding 411 and the secondary winding 421 are made of film-wrapped wire to form the primary winding 410 and the secondary winding 420 respectively, thereby avoiding the problem of inter-turn short circuit between windings 400, which has the advantages of both material safety and reliability and meeting performance requirements. Secondly, by adding an adjusting magnet 230 between the primary winding 411 and the secondary winding 421, flexible and precise control of the leakage inductance can be achieved, allowing for more flexible use as a resonant inductor in LLC circuits. The resonant inductor employs a leakage inductance magnetic integration scheme, integrating the resonant inductor onto the device, thereby reducing product size, material costs, and overall material costs, and facilitating the use of various leakage inductance magnitude modes in LLC circuits. In summary, this leakage inductance magnetic integration structure, which reduces eddy current losses, can optimize the performance of magnetic components such as transformers and inductors, improving the efficiency and power density of power electronic equipment.

[0045] It should be noted that in this embodiment, the first magnetic core 210 and the second magnetic core 220 are specifically UF magnetic cores. The materials used to make the magnetic cores can be, but are not limited to, ferric oxide, manganese tetroxide, zinc oxide, etc. Here, the low-voltage copper busbar 500 is commonly known in the industry as an LV (Low Voltage) copper busbar. The low-voltage copper busbar 500 can be regarded as a DC-DC (direct-current-direct-current) winding 400, which will generate significant eddy current losses during use.

[0046] Please see Figure 3 , Figures 6 to 8 In this embodiment, the first magnetic core 210 and the second magnetic core 220 are arranged opposite each other in the front-to-back direction; the frame 300 includes two sub-frames 310 arranged opposite each other in the front-to-back direction. The primary winding 410 includes four sets of primary windings 411, with one primary winding 411 wound on each of the left and right sides of each sub-frame 310; the secondary winding 420 includes two sets of secondary windings 421, with one secondary winding 421 wound in the middle region of each sub-frame 310; on each sub-frame 310, the left and right sides of the secondary windings 421 are partially staggered with the corresponding primary windings 411. It can be understood that this design, which controls the leakage inductance by adjusting the positions of the coils of the primary winding 410 and the secondary winding 420, can achieve the purpose of a resonant inductor, thereby meeting the requirements of the integrated inductor.

[0047] Furthermore, such as Figure 3 , Figure 6 and Figure 7 As shown, in this embodiment, each sub-frame 310 has a fixing groove 320 at its upper and lower ends for securing the primary winding 411 and the secondary winding 421. Multiple fixing grooves 320 in the partially staggered winding area where the secondary winding 421 and the primary winding 411 intersect are arranged intersectingly and partially connected. Here, the fixing grooves 320 mainly serve to fix and secure the windings, and are arranged in a continuous manner. Fixing grooves 320 with different orientations can determine different winding directions. Specifically, some fixing grooves 320 secure one winding, but in some fixing grooves 320 in the staggered winding area, two windings are secured overlapping vertically, with the secondary winding 421 located above the primary winding 411.

[0048] Further, please refer to Figure 3 , Figure 6 and Figure 8 In this embodiment, in the left region of the sub-frame 310, the gap between the outer ends of each coil of the primary winding 411 gradually increases to the right; in the right region of the sub-frame 310, the gap between the outer ends of each coil of the primary winding 411 gradually increases to the left; and the gap between the outer ends of each coil of the secondary winding 421 gradually increases from the center in the left and right directions respectively. In other words, by gradually increasing the distance between the coils of the primary winding 411 and gradually increasing the distance between the coils of the secondary winding 421, the external leakage magnetic field can be further counteracted, thereby reducing the eddy current loss of the low-voltage copper busbar 500.

[0049] Furthermore, such as Figure 3 , Figures 6 to 8 As shown, in this embodiment, the two sub-frames 310, four sets of primary windings 411, and two sets of secondary windings 421 are all arranged symmetrically along the central axis in the left-right direction. It can be understood that this symmetrical winding arrangement ensures that the wire lengths and cross-sectional areas of the two sets of coils are consistent, thereby reducing the total resistance and further reducing losses and improving efficiency.

[0050] Please see Figure 2 , Figure 5 , Figure 6 as well as Figure 8In this embodiment, the two free ends of the primary winding 411 of the primary winding 410 extend out of the base 100 to form two first pins 412, and the two free ends of the secondary winding 421 of the secondary winding 420 extend out of the base 100 to form two second pins 422. That is, after the primary winding 411 and the secondary winding 421, both multi-strand film-wrapped wires, are wound on the frame 300, their free ends can be led out on the base 100 as pins to facilitate subsequent wire connection with other components.

[0051] Please see Figure 3 , Figures 5 to 8 In this embodiment, both adjusting magnetic sheets 230 are elongated sheets with rectangular cross-sections. The two adjusting magnetic sheets 230 are arranged at intervals along the left-right direction. Each adjusting magnetic sheet 230 is located between the two sub-frames 310 and between the primary winding 411 and the secondary winding 421 on the same side. Here, by changing the dimensions of the two adjusting magnetic sheets 230, such as their thickness and length, the air gap size can be adjusted. This allows for control of the leakage inductance through the air gap, reducing the need to adjust the leakage inductance by relying on the winding distance 400, thereby achieving the goal of reducing costs while increasing product performance.

[0052] Specifically, such as Figure 5 As shown, in this embodiment, the base 100 is provided with two positioning posts 110, each positioning post 110 corresponding to an adjusting magnetic piece 230. Each positioning post 110 has a positioning slot 111, in which the lower end of the adjusting magnetic piece 230 is engaged. Here, by positioning the lower end of the adjusting magnetic piece 230 in the positioning slot 111 of the positioning post 110, the positioning and fixing of the adjusting magnetic piece 230 can be conveniently achieved. Furthermore, the positioning post 110 and the base 100 can be integrally formed.

[0053] Please see Figure 1 , Figure 2 , Figures 6 to 8In this embodiment, the low-voltage copper busbar 500 includes two upper copper busbars 510 and two lower copper busbars 520. The two upper copper busbars 510 are arranged opposite each other. Each upper copper busbar 510 includes a vertical side plate 515 and a top plate 516 extending horizontally from the top of the side plate 515. The top plate 516 located on the front side extends backward, and the top plate 516 located on the rear side extends forward. There is a gap between the two top plates 516. The two sheet-like lower copper busbars 520 are disposed on the base 100 and are arranged at intervals in the left-right direction. This shape and position arrangement of the low-voltage copper busbar 500 is conducive to further reducing eddy current losses and improving product performance. Specifically, in this embodiment, the lower end of the side plate 515 of the upper copper busbar 510 located on the front side is provided with a first connecting foot 511 extending downward, and the rear end of the top plate 516 is provided with a second connecting foot 512 extending downward; the lower end of the side plate 515 of the upper copper busbar 510 located on the rear side is provided with a third connecting foot 513 extending downward, and the front end of the top plate 516 is provided with a fourth connecting foot 514 extending downward; the outer edge of the lower copper busbar 520 located on the left side is provided with a fifth connecting foot 521 extending downward, and the outer edge of the lower copper busbar 520 located on the right side is provided with a sixth connecting foot 522 extending downward; the base 100 is provided with a plurality of through holes 120, and the first connecting foot 511, the second connecting foot 512, the third connecting foot 513, the fourth connecting foot 514, the fifth connecting foot 521 and the sixth connecting foot 522 are respectively inserted into the through holes 120 corresponding to their positions. In this way, by setting up each connecting pin, a reliable electrical connection between the low-voltage copper busbar 500 and other components can be smoothly achieved, while also taking into account functions such as mechanical fixation, optimized conductivity, and ease of installation.

[0054] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A leakage inductance magnetic integrated structure capable of reducing eddy current loss, used for a magnetic element, characterized in that, The leakage inductor magnetic integrated structure that can reduce eddy current losses includes: Base A magnetic core assembly is fixed above the base. The magnetic core assembly includes a first magnetic core, a second magnetic core, and two adjusting magnetic plates. The first magnetic core and the second magnetic core have U-shaped cross sections and are arranged opposite to each other, forming a hollow accommodating cavity in the middle. The skeleton is located above the base and is built into the accommodating cavity; The winding includes a primary winding and a secondary winding. The primary winding is formed by multiple sets of primary windings wound around the frame, and the secondary winding is formed by multiple sets of secondary windings wound around the frame. Both the primary and secondary windings are film-wrapped wires, and the primary and secondary windings are arranged in an alternating manner. Two adjusting magnets are built into the accommodating cavity and are respectively located between the primary and secondary windings. A low-voltage copper busbar is located outside the winding, at least partially covering the top and outer sides of the winding. The connecting feet at the lower end of the low-voltage copper busbar are connected to the base and extend from below the base.

2. The leakage inductance magnetic integrated structure capable of reducing eddy current loss according to claim 1, wherein, The first magnetic core and the second magnetic core are arranged opposite each other in the front-to-back direction; the frame includes two sub-frames arranged opposite each other in the front-to-back direction. The primary winding includes four sets of primary windings, with one primary winding wound on each of the left and right sides of each sub-frame; the secondary winding includes two sets of secondary windings, with one secondary winding wound in the middle of each sub-frame; on each sub-frame, the left and right sides of the secondary windings are partially staggered with the corresponding primary windings.

3. The leakage inductance magnetic integrated structure capable of reducing eddy current loss according to claim 2, wherein, Each of the sub-frames is provided with a wire-fixing groove at its upper and lower ends for securing the primary winding and the secondary winding. In the winding area where the secondary winding and the primary winding are partially staggered, the multiple wire-fixing grooves are intersected and partially connected.

4. The leakage inductance magnetic integrated structure capable of reducing eddy current loss according to claim 2, wherein, In the left region of the sub-frame, the gap between the outer ends of each coil of the primary winding gradually increases to the right; in the right region of the sub-frame, the gap between the outer ends of each coil of the primary winding gradually increases to the left. The gap between the outer ends of each coil of the secondary winding is set such that it gradually increases from the center along the left and right directions.

5. The leakage inductance magnetic integrated structure capable of reducing eddy current loss according to claim 2, wherein, The two sub-frames, the four sets of primary windings, and the two sets of secondary windings are all arranged symmetrically along the central axis in the left-right direction.

6. The integrated structure for reducing eddy current losses as described in claim 2, characterized in that, The two free ends of the primary winding of the primary side extend out of the base to form two first pins, and the two free ends of the secondary winding of the secondary side extend out of the base to form two second pins.

7. The integrated structure for reducing eddy current losses as described in claim 2, characterized in that, Both of the adjustment magnetic sheets are long sheets with rectangular cross-sections. The two adjustment magnetic sheets are arranged at intervals along the left and right direction. Each adjustment magnetic sheet is located between the two sub-frames and between the primary winding and the secondary winding on the same side.

8. The leakage inductance magnetic integrated structure capable of reducing eddy current loss according to claim 7, wherein, The base is provided with two positioning posts, each of which corresponds to the position of an adjusting magnetic piece. The positioning posts are provided with positioning slots, and the lower end of the adjusting magnetic piece is engaged in the positioning slots.

9. The leakage inductance magnetic integrated structure capable of reducing eddy current loss according to any one of claims 1 to 8, characterized in that, The low-voltage copper busbar includes two upper copper busbars and two lower copper busbars; the two upper copper busbars are arranged opposite each other, each upper copper busbar includes a vertical side plate and a top plate extending horizontally from the top of the side plate, the top plate located on the front side extends backward, the top plate located on the rear side extends forward, and there is a gap between the two top plates; the two sheet-like lower copper busbars are disposed on the base and are arranged at intervals in the left-right direction.

10. The leakage inductance magnetic integrated structure capable of reducing eddy current loss according to claim 9, wherein, The connecting pins include a first connecting pin, a second connecting pin, a third connecting pin, a fourth connecting pin, a fifth connecting pin, and a sixth connecting pin; the lower end of the side plate of the upper copper busbar located on the front side has a downwardly extending first connecting pin, and the rear end of the top plate has a downwardly extending second connecting pin; the lower end of the side plate of the upper copper busbar located on the rear side has a downwardly extending third connecting pin, and the front end of the top plate has a downwardly extending fourth connecting pin; the outer edge of the lower copper busbar located on the left side has a downwardly extending fifth connecting pin, and the outer edge of the lower copper busbar located on the right side has a downwardly extending sixth connecting pin; The base is provided with multiple through holes, and the first connecting foot, the second connecting foot, the third connecting foot, the fourth connecting foot, the fifth connecting foot and the sixth connecting foot are respectively inserted into the through holes corresponding to their positions.

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