Double-center-column transformer and circuit board

Abstract

The invention discloses a double-center-pillar transformer and a circuit board, the double-center-pillar transformer comprises a magnetic core and a winding, the magnetic core comprises a first center pillar and a second center pillar, the winding comprises a primary winding, a first secondary winding and a second secondary winding, the first secondary winding and the second secondary winding are respectively wound from the first center pillar and are wound to the second center pillar in a spanning manner, and the first secondary winding and the second secondary winding are wound in a spanning manner. The two secondary windings are distributed on the two middle columns at the same time to form a symmetrical winding structure, then uniform coupling of magnetic flux of the two middle columns is achieved, the situation of uneven magnetic flux distribution caused by size tolerance of the middle columns or inconsistent splicing air gaps is remarkably reduced, and therefore the voltage consistency and the current sharing capacity of the two secondary windings are effectively improved. Meanwhile, the primary side winding is wound on the outer sides of the two secondary side windings, a stable magnetic coupling relation is formed by the primary side winding and the secondary side windings by setting the insulation interval, and the overall operation stability of the transformer can be improved.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and more particularly to a double-column transformer and its circuit board. Background Technology

[0002] As the core component of power conversion units, transformers are widely used in various power electronic devices. They mainly rely on the principle of electromagnetic induction to work: when alternating current flows through the primary winding, an alternating magnetic field is formed in the magnetic core. This magnetic field then induces an electromotive force in the secondary winding, realizing the transfer and conversion of energy.

[0003] With the continuous improvement of power density and conversion efficiency in power systems, higher requirements are placed on the heat dissipation performance, magnetic coupling efficiency, and size control of transformers. Traditional single-column core structures are no longer sufficient to meet the thermal management and structural layout requirements of high-density power conversion. To address this, a dual-column core structure has been proposed in existing technologies. This structure divides the core into two central columns, two side columns, and a yoke, forming a through-ventilation channel between the two central columns. This allows the main heat-generating areas inside the transformer (such as the core and windings) to be directly exposed to the airflow, thereby significantly improving heat dissipation performance and power density.

[0004] However, when this structure is applied to transformers with two secondary windings, significant drawbacks remain. Specifically, due to unavoidable dimensional tolerances and inconsistent air gaps between the two center columns during actual manufacturing and assembly, the magnetic flux distribution passing through the two center columns is uneven. This results in differences in the voltage induced on the two secondary windings, causing uneven current distribution. This uneven current phenomenon not only affects the secondary output performance but may also lead to uneven winding heating, reduced device efficiency, and even affect the long-term stable operation of the transformer. Summary of the Invention

[0005] The main objective of this invention is to provide a dual-column transformer and circuit board to at least solve the technical problems mentioned in the related art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, the present invention provides a dual-core transformer, the dual-core transformer comprising a magnetic core and windings; The magnetic core includes a first central column and a second central column arranged at intervals; The winding includes a primary winding, a first secondary winding, and a second secondary winding; The first secondary winding starts from the first central post, crosses over to the second central post and completes the winding, and the second secondary winding starts from the first central post, crosses over to the second central post and completes the winding. The primary winding is wound outside the first secondary winding and the second secondary winding, and forms a second gap with the first secondary winding and the second secondary winding.

[0007] A second aspect of the present invention also provides a circuit board, including a circuit board body and a dual-column transformer as described in the first aspect, the dual-column transformer being disposed on the circuit board body.

[0008] The dual-column transformer and circuit board of the present invention, by winding the first secondary winding and the second secondary winding from the first column and bridging them across the second column, allows the two secondary windings to be simultaneously distributed on the two columns, forming a symmetrical winding structure. This achieves uniform coupling of the magnetic flux between the two columns, significantly reducing uneven magnetic flux distribution caused by inconsistent column dimensional tolerances or splicing air gaps, thereby effectively improving the voltage consistency and current sharing capability of the two secondary windings. At the same time, the primary winding is wound outside the two secondary windings, and by setting an insulation interval, it forms a stable magnetic coupling relationship with the secondary windings, which helps to improve the overall electromagnetic performance and operational stability of the transformer. It is particularly suitable for dual-column transformer structures with high power density and high heat dissipation requirements. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a three-dimensional schematic diagram of a double-column transformer in related technologies. Figure 2 This is a three-dimensional schematic diagram of a dual-column transformer in an embodiment of this application; Figure 3 This is a schematic diagram of the magnetic core after omitting the two central pillars in the embodiment of this application; Figure 4 This is a schematic diagram of the corresponding magnetic reluctance in the equivalent circuit after the secondary windings of the two middle columns are wound in an embodiment of this application. Figure 5 This is a three-dimensional schematic diagram of a dual-column transformer in an embodiment of this application; Figure 6 A schematic diagram showing that different secondary windings are wound on both intermediate columns in a dual-column transformer provided in this application embodiment; Figure 7 A front view of the double-column transformer provided in this application, showing that different secondary windings are wound on both inner frame layers; Figure 8 A schematic diagram of the back of a double-column transformer provided in this application, showing that different secondary windings are wound on both inner frame layers; Figure 9 This is a three-dimensional schematic diagram of the first inner layer skeleton in an embodiment of this application.

[0011] Reference numerals: First secondary winding 11A, Second secondary winding 11B, Primary winding 12, First center post 21, Second center post 22, Magnetic yoke structure 23, First side post 24, Second side post 25, First gap 30, First inner skeleton 41, Second inner skeleton 42, Outer skeleton 50, First air duct 61, Third air duct 62, Second air duct 63, Magnetic yoke cavity 231, Second magnetic yoke concave surface 232, First magnetic yoke concave surface 233, First positioning slot 411, First insulation structure 412, At least a portion of the first secondary winding 11A1, At least a portion of the second secondary winding 11B1. Detailed Implementation

[0012] To make the inventive objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application 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 application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0013] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0014] In the description of the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. The term "multiple" means two or more, unless otherwise explicitly specified. The term "comprising" indicates the presence of the described feature, whole, step, operation, element, and / or component, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or sets thereof. The term "and / or" describes the relationship between related objects, indicating that three relationships may exist. For example, A and / or B may include three cases: A existing alone, A and B existing simultaneously, and B existing alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship.

[0015] Unless otherwise defined, all technical terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art; the terms used in the embodiments of this application are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the specification, claims and foregoing description of the drawings of this application are intended to cover non-exclusive inclusion.

[0016] Furthermore, terms such as "exemplary," "for example," and "optional" are used to indicate illustrative purposes. Any technical solution described by the above terms in the embodiments of this application should not be construed as being more preferred or advantageous than other technical solutions. Specifically, these terms are intended to present the relevant technical concepts in terms of specific implementation methods.

[0017] Please refer to the following in order. Figures 1 to 6 This application provides a dual-core transformer, which includes a magnetic core and windings. The components are described below: The magnetic core includes a first central column 21 and a second central column 22 with approximately the same structural dimensions and splicing gaps, which are spaced apart. The first central column 21 and the second central column 22 are arranged opposite each other and form a first gap 30 to provide space for the traversal of the windings. In this embodiment, the left and right orientation of the first central column 21 and the second central column 22 is not limited, and their relative positional relationship can be mirrored, interchanged, or rotated according to assembly requirements, which does not constitute a limitation on the scope of protection of this application.

[0018] The windings include a primary winding 12, a first secondary winding 11A, and a second secondary winding 11B. The first secondary winding 11A begins winding from the first central post 21 (i.e., the winding start) and winds a preset number of turns, then crosses over a first interval 30 to the second central post 22 and winds a preset number of turns to complete the winding (i.e., the winding finish). The second secondary winding 11B also uses the same winding method, starting from the first central post 21 and crossing over a first interval 30 to the second central post 22 to complete the winding. Thus, at least a portion of the two secondary windings 11A and 11B, 11A1 and 11B1, are located within the first interval 30 and are respectively positioned across the first central post 21 and the second central post 22 via the first interval 30, achieving a symmetrical arrangement of the windings (i.e., the magnetic flux path formed by the first secondary winding 11A is equal to the magnetic flux path formed by the second secondary winding 11B), ensuring the consistency of the secondary windings in electromagnetic coupling. In this embodiment, the two secondary windings are wound separately and simultaneously pass around the two central columns. This can avoid uneven current in the secondary windings caused by inconsistent magnetic flux on the central columns, and the two secondary windings can be separated by physical distance to avoid poor withstand voltage in the two secondary windings.

[0019] In this configuration, the number of turns and the winding interval of the first secondary winding 11A on the first central column 21 are equal to those of the first secondary winding 11A on the second central column 22. Similarly, the number of turns and the winding interval of the second secondary winding 11B on the first central column 21 are equal to those of the second secondary winding 11B on the second central column. Likewise, the number of turns and the winding interval of the first secondary winding 11A on the first central column 21 are equal to those of the second secondary winding 11B on the first central column 22. In short, the number of turns, winding length, and winding interval of the two secondary windings 11A and 11B on the first central column 21 are all equal, and the number of turns, winding length, and winding interval of each secondary winding on different central columns are also equal, forming a "vertically symmetrical and horizontally symmetrical" winding layout.

[0020] In addition, the primary winding 12 is wound outside the first secondary winding 11A and the second secondary winding 11B, and forms a second gap (not shown in the figure) between the two secondary windings to avoid direct contact between the primary and secondary windings and ensure sufficient electrical insulation distance.

[0021] It should be noted that in the related technology, the double-column transformer winding structure typically involves two secondary windings wound on two different columns. The primary winding is mounted on the two columns and the two secondary windings via a bobbin. When the two columns are exactly the same size and the air gap between them is also exactly the same, the magnetic reluctance of the two columns is the same (i.e., Figure 3In the original text, R1=R2. However, in actual mass-produced products, due to tolerances, it is difficult to ensure that the sizes of the two intermediate columns and the splicing air gap are consistent, resulting in R1≠R2. This leads to inconsistent induced voltages on the two secondary sides, causing uneven current flow through them, which can seriously affect the stable operation of the transformer. To solve this problem, the primary side can be wound in series with the two intermediate columns, and the two secondary sides can be wound in parallel on the outer winding. This ensures that the coupling coefficients of the two secondary windings are consistent with those of the primary winding. However, the parallel-wound secondary windings are prone to insufficient withstand voltage under high voltage conditions, which can damage the transformer.

[0022] However, the double-column transformer of this application, by starting the first secondary winding and the second secondary winding from the first column and bridging them across the gap between the columns to the second column, allows the two secondary windings to be simultaneously distributed on the two columns, forming a symmetrical winding structure. This achieves uniform coupling of the magnetic flux between the two columns, significantly reducing the uneven distribution of magnetic flux caused by inconsistent column dimensional tolerances or splicing air gaps, thereby effectively improving the voltage consistency and current sharing capability of the two secondary windings. In addition, the primary winding is wound outside the two secondary windings, and by setting an insulation gap, it forms a stable magnetic coupling relationship with the secondary windings, which helps to improve the overall electromagnetic performance and operational stability of the transformer. It is particularly suitable for double-column transformer structures with high power density and high heat dissipation requirements.

[0023] Please see Figure 4 , Figure 6 , Figure 7 and Figure 8 The outer side of the first central column 21 is provided with a first inner frame 41, and the outer side of the second central column 22 is provided with a second inner frame 42.

[0024] Specifically, when the first secondary winding 11A is wound, the turns are first wound outside the first inner layer skeleton 41, then crossed through the first interval 30 to the second inner layer skeleton 42, and then wound outside the second inner layer skeleton 42, and finally the winding is completed.

[0025] Correspondingly, the second secondary winding 11B is wound in the same way as the first secondary winding 11A. It is first wound on the outside of the first inner frame 41, then wound across the first interval 30 to the second inner frame 42, and continues to be wound on the outside of the second inner frame 42, and finally the winding is completed.

[0026] This embodiment uses a first inner frame 41 and a second inner frame 42. The winding paths of the two secondary windings on the first inner frame 41 and the second inner frame 42 are completely symmetrical. This not only ensures the spatial consistency and electromagnetic symmetry of the windings, but also facilitates the control of the winding process during mass production, thereby further improving the current sharing performance of the secondary windings.

[0027] It should be understood that in the embodiments of this application, the first secondary winding 11A and the second secondary winding 11B have the same number of turns and winding length in the corresponding first inner frame 41 and second inner frame 42, and the winding interval is the same, thereby ensuring the consistency of the two secondary windings in magnetic flux coupling and electrical parameters, so as to achieve the sharing of output current.

[0028] Please see Figure 5 The initial winding position of the first secondary winding 11A on the first inner frame 41 is located in the top region near the first central column 21 (i.e., winding starts from the top region), and its ending winding position is located in the middle region near the first central column 21 (i.e., winding continues from the top region to the middle region). After the first secondary winding 11A is wound on the first inner frame 41, it is wound across the second inner frame 42 through the first interval 30, and the initial winding position on the second inner frame 42 is located in the middle region near the second central column (i.e., winding starts from the middle region), and its ending winding position is located in the top region near the second central column (i.e., winding continues from the middle region to the top region).

[0029] In this embodiment, the first secondary winding is wound along the above-mentioned winding path, so that the distribution of the first secondary winding on the two central columns is symmetrical, which is beneficial to optimize the magnetic flux distribution and further improve the current sharing effect.

[0030] Accordingly, the second secondary winding 11B is positioned initially near the bottom of the first intermediate column 21 in the first inner frame 41, and at the end of the first inner frame 41 near the middle of the first intermediate column 21. Similarly, the second secondary winding 11B is positioned initially near the middle of the second intermediate column 22 in the second inner frame 42, and at the end of the second inner frame 42 near the bottom of the second intermediate column. Thus, the winding path of the second secondary winding 11B on the two intermediate columns forms a vertically symmetrical relationship with the first secondary winding 11A, maintaining spatial consistency and symmetry in the overall structure of the two secondary windings. This further improves the electrical parameter matching of the secondary windings, ensures current sharing, and enhances the overall operational stability of the transformer.

[0031] Please refer to the following: Figure 6 and Figure 9The first inner frame 41 forms a first internal cavity (not marked in the figure, but visible), and the first inner frame 41 is fitted onto the first central column 21 through the first internal cavity; and the first inner frame 41 also forms multiple sets of first through slots 411, which are distributed at intervals along the height direction of the first inner frame 41, and each set of first through slots 411 communicates with the first internal cavity, which is beneficial for heat dissipation of the first central column 21 inside.

[0032] Similarly, the second inner frame 42 forms a second internal cavity, and the second inner frame 42 is fitted onto the outside of the second central column 22 through the second internal cavity. Multiple sets of second through slots are distributed sequentially at intervals along the height direction of the second inner frame 42, and each set of second through slots is connected to the second internal cavity, which is beneficial for heat dissipation of the internal second central column 22.

[0033] In this embodiment, the winding of the first secondary side winding and the second secondary side winding on the two central columns are guided and positioned by the inner skeleton, which not only ensures the consistency of the winding in spatial position, but also improves the controllability of the winding process and the consistency of mass production.

[0034] In an optional embodiment of this application, the first inner skeleton 41 forms a first intermediate spacer portion, and the second inner skeleton 42 forms a second intermediate spacer portion.

[0035] Specifically, the first intermediate spacing portion 412 can be an outward protrusion of the skeleton, roughly located in the middle of the first inner skeleton 41. It is used to physically isolate the first secondary winding 11A and the second secondary winding 11B on the first inner skeleton 41, thereby achieving electrical insulation. Correspondingly, the second intermediate spacing portion is roughly located in the middle of the second inner skeleton 42 (if the second inner skeleton 42 is placed vertically, the spacing portion is located at half its height). It is mainly used to physically isolate the first secondary winding 11A and the second secondary winding 11B on the second inner skeleton 42, thereby achieving electrical insulation.

[0036] Please return and continue reading. Figure 2 The magnetic core also includes a yoke structure 23, a first side post 24, and a second side post 25. One side of the yoke structure 23 connects the first side post 24 to the first central post 21, and the other side of the yoke structure 23 connects the second side post 25 to the second central post 22, thus forming a complete magnetic flux loop.

[0037] Specifically, the primary winding 12 is wound on the outer layer of the two secondary windings. One side of its outer surface is located between the first secondary winding 11A and the first post 24, and the other side of the outer surface of the primary winding 12 is located between the second secondary winding 11B and the second post 25. Through this arrangement, the primary winding is spatially located on the outer layer of the secondary windings and adjacent to the post, thus ensuring a tight magnetic coupling between the primary and secondary windings while utilizing the post to provide additional mechanical support and heat dissipation channels, further improving the electromagnetic performance and heat dissipation efficiency of the transformer.

[0038] In addition, a concave structure is provided in the middle of the two center columns to expand the airflow channel, and an outward convex structure is provided on the side of the center column near the side wall to adapt to the springback shape during winding, thereby improving the utilization of winding space and increasing the cross-sectional area of ​​the center columns, reducing core losses. Furthermore, the side walls of the core are generally rectangular, with large arc cuts on the inner side to ensure consistent spacing between corresponding parts of the center columns and side columns, contributing to uniform magnetic flux distribution. The side walls have an asymmetrical structure at the top and bottom, with support legs at the bottom to reserve space for lead wire exits, facilitating processing and assembly. The yoke connects the center columns and side columns respectively. The yoke section between the two center columns has a smaller cross-sectional area, used to create magnetic flux flow when the magnetic flux in the center columns is uneven, thus balancing the magnetic flux distribution; the yoke section between the center columns and the side walls serves as the main magnetic flux loop, ensuring the stability of the transformer operation.

[0039] In an optional embodiment of this application, the dual-column transformer further includes an outer frame 50. The outer frame 50 is disposed outside the first secondary winding 11A and the second secondary winding 11B, and serves as a support structure for the primary winding 12.

[0040] Specifically, the primary winding 12 is wound on the outer surface of the outer frame 50. The outer frame 50 can limit and position the turns of the primary winding, ensuring the uniformity and stability of the winding distribution. At the same time, the outer frame 50, as an isolation structure between the primary winding and the secondary winding, can effectively increase the insulation distance between the two, further improving the overall withstand voltage performance and safety of the machine.

[0041] Furthermore, a magnetic yoke cavity 231 is formed between the first central column 21 and the second central column 22 in the magnetic yoke structure 23. The magnetic yoke cavity 231 is a cavity in the thickness direction of the magnetic yoke structure 23, which is used to form multiple heat dissipation channels between the winding and the central column and between the windings.

[0042] Specifically, the magnetic yoke cavity 231 can form a first air duct 61 between the inner side of the first secondary winding 11A and the first central column 21, a second air duct 63 between the inner side of the second secondary winding 11B and the second central column 22, and a third air duct 62 between the outer side of the first secondary winding 11A, the outer side of the second secondary winding 11B and the inner side of the primary winding 12.

[0043] This embodiment, through the aforementioned multi-channel design, allows the main heat-generating areas inside the transformer (including the intermediate and secondary windings, and the primary winding) to be directly exposed in the channels, avoiding internal heat accumulation. This significantly improves air convection heat dissipation efficiency, reduces the temperature rise of the windings and core, and helps to improve the overall power density and operational reliability.

[0044] In an optional embodiment of this application, the top and bottom sides of the magnetic yoke structure 13 are respectively designed with concave structures (233, 232) for auxiliary heat dissipation, so as to further optimize the cooling channel of the external winding (i.e., primary winding) area.

[0045] Specifically, a first concave surface 233 is provided on one side of the top of the magnetic yoke structure 13, in a direction away from the inner windings (first secondary winding, second secondary winding). This first concave surface 233 forms a third gap with the top of the inner side of the primary winding, which constitutes a through fourth air duct. In this way, the cooling medium (airflow) can flow along the fourth air duct to exchange heat with the top of the inner side of the primary winding and the top of the outer sides of the two secondary windings.

[0046] Similarly, on the other side of the magnetic yoke structure 13, a second concave surface 232 is provided in a direction away from the inner windings (first secondary winding, second secondary winding), forming a fourth gap between it and the bottom of the inner side of the primary winding, thus constituting a fifth air duct. In this way, the cooling medium (airflow) can flow along the fifth air duct to exchange heat with the bottom of the inner side of the primary winding and the bottom of the outer side of the two secondary windings.

[0047] In this embodiment, the fourth and fifth air ducts form a set of cooling channels around the top and bottom sides of the primary winding. Together with the first air duct 61 and the second air duct 63 in the central column area, they form a three-dimensional heat dissipation path that runs through the inside and outside of the transformer, effectively improving the thermal balance capability of the entire magnetic component and meeting the thermal design requirements under high power density conditions.

[0048] The multiple air ducts (first air duct, second air duct, third air duct, fourth air duct, and fifth air duct) formed in the embodiments of this application are further explained here: The aforementioned air ducts are all constructed through naturally formed hollow areas or gaps, forming a built-in heat dissipation channel that requires no additional air duct components, resulting in a compact and simple design. These air ducts can be understood as hollow areas that, when combined with external heat dissipation components (fans, etc.), naturally form airflow channels. Since the air ducts run through the front and rear of the double-column transformer, airflow can enter from one side, pass through the gaps on both sides of the windings, and exit from the other side, achieving forced air cooling and improving the overall heat dissipation performance of the transformer.

[0049] This application also provides a circuit board, including a circuit board body, a PFC inductor, and a dual-column transformer as described in the above embodiments, wherein the PFC inductor and the dual-column transformer are disposed on the circuit board body.

[0050] Specifically, the main body of the circuit board serves as a structural platform for supporting and connecting various power electronic components. The PFC inductor and the dual-column transformer are arranged side-by-side on the main body of the circuit board, forming the key magnetic component unit in the PFC boost converter topology. By arranging the aforementioned dual-column transformer with a symmetrical airflow design within the forced air cooling duct reserved on the circuit board, the overall heat dissipation efficiency and thermal stability of the module can be significantly improved.

[0051] The dual-column transformer and circuit board of this application embodiment are wound from the first column to the second column, with the first and secondary windings winding from the first column and crossing the first gap to complete the winding. This allows the two secondary windings to be distributed on the two columns simultaneously and form a symmetrical coupling path, thereby significantly reducing the magnetic flux unevenness caused by the dimensional tolerance of the columns or the difference in the splicing air gap, improving the consistency of the induced voltage of the two secondary windings and achieving current sharing. At the same time, the primary winding is arranged outside the two secondary windings and a second gap is set to avoid direct contact between the primary and secondary windings, increase the insulation distance and improve the withstand voltage reliability. The overall structure ensures good magnetic coupling and operational stability while facilitating batch winding and assembly, and is suitable for high power density, demanding heat dissipation and high withstand voltage application scenarios.

[0052] The specific embodiments of the invention have been described in detail above, but these are merely examples, and the invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications or substitutions to the invention are also within the scope of this invention. Therefore, all equivalent transformations, modifications, and improvements made without departing from the spirit and principles of this invention should be covered within the scope of this invention.

Claims

1. A double-column transformer, characterized in that, The dual-column transformer includes a magnetic core and windings; The magnetic core includes a first central column and a second central column arranged at intervals; The winding includes a primary winding, a first secondary winding, and a second secondary winding; The first secondary winding starts from the first central post, crosses over to the second central post and completes the winding, and the second secondary winding starts from the first central post, crosses over to the second central post and completes the winding. The primary winding is wound outside the first secondary winding and the second secondary winding, and is spaced apart from the first secondary winding and the second secondary winding.

2. The dual-column transformer as described in claim 1, characterized in that, The outer side of the first central column is provided with a first inner frame, and the outer side of the second central column is provided with a second inner frame. The first secondary winding is wound on the outside of the first inner layer skeleton, crosses over to the second inner layer skeleton, and completes the winding on the outside of the second inner layer skeleton; The second secondary winding is wound on the outside of the first inner layer skeleton, crosses over to the second inner layer skeleton, and completes the winding on the outside of the second inner layer skeleton.

3. The dual-column transformer as described in claim 2, characterized in that, The first secondary winding is positioned at the initial winding position of the first inner layer skeleton near the top of the first central column, the first secondary winding is positioned at the end winding position of the first inner layer skeleton near the middle of the first central column, the first secondary winding is positioned at the initial winding position of the second inner layer skeleton near the middle of the second central column, and the first secondary winding is positioned at the end winding position of the second inner layer skeleton near the top of the second central column.

4. The dual-column transformer as described in claim 3, characterized in that, The second secondary winding is positioned at the initial winding position of the first inner layer skeleton near the bottom of the first central column, the second secondary winding is positioned at the end winding position of the first inner layer skeleton near the middle of the first central column, the second secondary winding is positioned at the initial winding position of the second inner layer skeleton near the middle of the second central column, and the second secondary winding is positioned at the end winding position of the second inner layer skeleton near the bottom of the second central column.

5. The double-column transformer as described in any one of claims 2 to 4, characterized in that, The first inner frame forms a first internal cavity, and the first inner frame is sleeved on the first central column through the first internal cavity; wherein, the first inner frame also forms multiple sets of first slots, the multiple sets of first slots are distributed at intervals in the height direction of the first inner frame, and each set of first slots communicates with the first internal cavity. The second inner skeleton forms a second internal cavity, and the second inner skeleton is sleeved on the second central column through the second internal cavity; wherein, the second inner skeleton also forms multiple sets of second through grooves, the multiple sets of second through grooves are distributed at intervals in the height direction of the second inner skeleton, and each set of second through grooves communicates with the second internal cavity.

6. The dual-column transformer as described in claim 5, characterized in that, The first inner skeleton forms a first intermediate spacer portion, and the second inner skeleton forms a second intermediate spacer portion; The first intermediate spacer is used to isolate the first secondary winding and the second secondary winding on the first inner frame, and the second intermediate spacer is used to isolate the first secondary winding and the second secondary winding on the second inner frame.

7. The dual-column transformer as described in claim 2, characterized in that, The magnetic core also includes a magnetic yoke structure, a first side post, and a second side post; One side of the magnetic yoke structure connects the first side post and the first middle post, and the other side of the magnetic yoke structure connects the second side post and the second middle post; Wherein, one side of the outer surface of the primary winding is located between the first secondary winding and the first side post, and the other side of the outer surface of the primary winding is located between the second secondary winding and the second side post.

8. The dual-column transformer as described in claim 7, characterized in that, The dual-column transformer also includes an outer frame; The outer frame is located outside the first secondary winding and the second secondary winding, and the primary winding is wound on the outer frame.

9. The dual-column transformer as described in claim 1, characterized in that, The number of turns and the winding interval of the first secondary winding on the first central column are equal to the number of turns and the winding interval of the first secondary winding on the second central column, the number of turns and the winding interval of the second secondary winding on the first central column are equal to the number of turns and the winding interval of the second secondary winding on the second central column, and the number of turns and the winding interval of the first secondary winding on the first central column are equal to the number of turns and the winding interval of the second secondary winding on the first central column.

10. A circuit board, characterized in that, It includes a circuit board body and a dual-column transformer as described in any one of claims 1 to 9, wherein the dual-column transformer is disposed on the circuit board body.

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