A Magnetic Integrated High-Frequency Transformer Core Structure and Leakage Inductance Control Method

Abstract

The present disclosure provides a magnetic core structure and leakage inductance control method for a magnetically integrated high-frequency transformer, which relates to the technical field of high-frequency transformers. The structure comprises two square magnetic core side columns, a first main magnetic core column, a second main magnetic core column, a first auxiliary magnetic core column and a second auxiliary magnetic core column. The two square magnetic core side columns are placed in parallel up and down, the first main magnetic core column and the second main magnetic core column are placed parallel and vertically between the two square magnetic core side columns, and the two ends of the first main magnetic core column and the second main magnetic core column are fixedly connected to the two ends of the two square magnetic core side columns respectively; the two square magnetic core side columns are hollowed out in the middle, the first auxiliary magnetic core column and the second auxiliary magnetic core column are placed parallel and vertically on both sides of the hollowing, windings are provided on the two main magnetic core columns and the two auxiliary magnetic core columns, the square magnetic core side columns are fixed to the main and auxiliary magnetic core columns, and serve as magnetic flux channels connecting the main and auxiliary magnetic core columns. The leakage inductance of the magnetically integrated high-frequency transformer can be precisely modulated by adjusting the number of turns of the secondary auxiliary winding.

Description

Technical Field

[0001] The present disclosure relates to the technical field of high-frequency transformers, and in particular to a magnetic core structure of a magnetically integrated high-frequency transformer and a leakage inductance control method. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art.

[0003] In recent years, with the use of renewable energy and the advancement of power electronics technology, power supply systems have required an increasing number of power converters to transmit and convert electrical energy. Power density, a key performance metric in power converter systems, has been extensively studied. To reduce converter size and achieve miniaturization, magnetic integration solutions can be employed.

[0004] Traditional transformers in power electronics typically utilize multiple ferrite or other high-performance magnetic cores. These cores are widely used due to their simple design principles and ease of fabrication. For multi-transformer applications, transformer integration is crucial for improving the power density and operating efficiency of power electronics.

[0005] Leakage inductance is crucial for optimizing high-frequency transformers, helping to improve energy transmission efficiency and contributing to the stability and reliability of high-frequency circuits. Adjusting the leakage inductance of high-frequency transformers is also crucial to meeting the needs of soft-switching power supply resonant circuits.

[0006] However, there are currently few technologies for adjusting the leakage inductance of high-frequency transformers. Traditionally, the method for adjusting the leakage inductance of high-frequency transformers mainly involves changing the air gap in the core. However, this air gap increases losses, causes magnetic field instability, and generates noise, negatively impacting the performance and stability of the high-frequency transformer. Summary of the Invention

[0007] In order to solve the above problems, the present disclosure proposes a magnetic core structure and leakage inductance control method for a magnetically integrated high-frequency transformer, designs a magnetically integrated core structure, and based on the magnetically integrated core structure, achieves precise modulation of the leakage inductance of the magnetically integrated high-frequency transformer by adjusting the number of turns of the secondary auxiliary winding, thereby avoiding the negative effects such as loss, heat and noise generated when an air gap is opened on the magnetic core.

[0008] According to some embodiments, the present disclosure adopts the following technical solutions:

[0009] A magnetic core structure of a magnetically integrated high-frequency transformer, comprising:

[0010] Two square magnetic core side columns, a first main magnetic core column, a second main magnetic core column, a first auxiliary magnetic core column and a second auxiliary magnetic core column, the two square magnetic core side columns are placed parallel to each other, the first main magnetic core column and the second main magnetic core column are placed parallel and vertically between the two square magnetic core side columns, and the two ends of the first main magnetic core column and the second main magnetic core column are respectively fixedly connected to the two ends of the two square magnetic core side columns;

[0011] The two square magnetic core side columns are hollowed out in the middle, and the first secondary magnetic core column and the second secondary magnetic core column are placed vertically and parallelly on both sides of the hollow and are fixedly connected to the two square magnetic core side columns; windings are provided on the two main magnetic core columns and the two secondary magnetic core columns, and the square magnetic core side columns are fixed to the main and secondary magnetic core columns, serving as magnetic flux channels connecting the main and secondary magnetic core columns.

[0012] Furthermore, the first main magnetic core column, the second main magnetic core column, the first auxiliary magnetic core column, the second auxiliary magnetic core column and the two square magnetic core side columns are all made of isotropic magnetic materials, so that the magnetic core has the same magnetic permeability in different directions, and the magnetic permeability of the main magnetic core column and the auxiliary magnetic core column is greater than the magnetic permeability of the square magnetic core side column.

[0013] Furthermore, the first main magnetic core leg, the second main magnetic core leg, the first auxiliary magnetic core leg and the second auxiliary magnetic core leg have the same cross-sectional area.

[0014] Furthermore, the width of the side columns of the square magnetic core is equal to the width of the first main magnetic core column, the second main magnetic core column, the first auxiliary magnetic core column and the second auxiliary magnetic core column.

[0015] Furthermore, the first primary winding and the first secondary winding of the first transformer are wound on the first main magnetic core column, and the second primary winding and the second secondary winding of the second transformer are wound on the second main magnetic core column, and both sets of primary windings and secondary windings are overlapped and placed overlapping with each other in the vertical direction of the two main magnetic core columns.

[0016] Furthermore, the first secondary winding and the second secondary winding are connected in series to the first secondary auxiliary winding and the second secondary auxiliary winding respectively. The first secondary auxiliary winding and the second secondary auxiliary winding are overlapped and wound as a whole on the secondary magnetic core column, overlapping each other in the vertical direction of the secondary magnetic core column.

[0017] Further, the winding directions of the first secondary auxiliary winding and the second secondary auxiliary winding are opposite to the winding directions of the first secondary winding and the second secondary winding.

[0018] Furthermore, the conductors of the windings are made of copper foil or Litz wire.

[0019] According to some embodiments, the present disclosure adopts the following technical solutions:

[0020] A leakage inductance control method for a magnetically integrated high-frequency transformer core structure includes:

[0021] The leakage magnetic reactance X generated by the first secondary auxiliary winding and the second secondary auxiliary winding σ Calculated as:

[0022]

[0023] Among them, f is the excitation frequency of the high-frequency transformer, N a is the number of turns of the secondary auxiliary winding, μ0 is the magnetic permeability of air, μ0=4π×10 -7 H / m, A0 and l0 are the cross-sectional area and length of the air magnetic circuit respectively.

[0024] Furthermore, by adjusting the number of turns of the secondary auxiliary winding, the leakage flux of the secondary auxiliary winding in the hollow of the magnetic core is adjusted, thereby achieving precise modulation of the leakage inductance. The number of turns of the first primary winding of the first transformer is N p1 , the number of turns of the first secondary winding is N s1 , the number of turns of the first secondary auxiliary winding is N a1 The secondary auxiliary winding is mainly used to provide leakage inductance and has little effect on the magnetic flux flowing through the primary winding and the secondary winding in the magnetic core. p1 / (N s1 +N a1 )≈N p1 / N s1 , the voltage ratio of the first transformer is approximately N p1 / N s1 ; The same applies to the second transformer.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention discloses a magnetic core structure and leakage inductance control method for a magnetically integrated high-frequency transformer, in which two square magnetic core side columns are arranged to have a gap in the middle, the first auxiliary magnetic core column and the second auxiliary magnetic core column are placed vertically and parallel on both sides of the hollow, the two main magnetic core columns and the two auxiliary magnetic core columns are provided with windings, and the square magnetic core side columns are fixed to the main and auxiliary magnetic core columns to serve as magnetic flux channels connecting the main and auxiliary magnetic core columns. Under this magnetically integrated core structure, the leakage inductance of the magnetically integrated high-frequency transformer can be precisely modulated by adjusting the number of turns of the secondary auxiliary winding, effectively avoiding the negative effects such as loss, heat and noise generated when an air gap is opened on the magnetic core.

[0027] The disclosed magnetic core structure and leakage inductance control method for a magnetically integrated high-frequency transformer effectively improve the power density and efficiency of the high-frequency transformer while miniaturizing the magnetic components. This reduces transformer losses and contributes to improved reliability and miniaturization of power electronic devices. Furthermore, the secondary auxiliary winding, wound on the integral auxiliary magnetic core, allows precise adjustment of the leakage inductance by varying the number of turns of the secondary auxiliary winding.

[0028] The present invention discloses a magnetic core structure and leakage inductance control method for a magnetically integrated high-frequency transformer. The first main magnetic core column, the second main magnetic core column, the first auxiliary magnetic core column, the second auxiliary magnetic core column and the two square magnetic core side columns are all made of isotropic magnetic materials to ensure that the magnetic core has the same magnetic permeability in different directions, and the magnetic permeability of the main magnetic core column and the auxiliary magnetic core column is much greater than the magnetic permeability of the square magnetic core side column, thereby realizing the decoupling integration of the first transformer and the second transformer, thereby effectively improving the power density and efficiency of the high-frequency transformer on the basis of a smaller magnetic core volume. Specifically, by adopting the magnetic permeability of the main magnetic core column and the auxiliary magnetic core column greater than the magnetic permeability of the square magnetic core side column, the main and auxiliary magnetic core columns form a low magnetic resistance magnetic circuit. For the first transformer, the magnetic flux generated by the first primary winding is mainly distributed along the low magnetic resistance magnetic circuit, and the magnetic flux forms a magnetic flux loop along the direction of the first main magnetic core column-upper square magnetic core side column-two auxiliary magnetic core columns-lower square magnetic core side column-first main magnetic core column. The same is true for the second transformer. Therefore, the decoupled integration of two transformers is achieved on the magnetic core of this structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which constitute a part of the present disclosure, are used to provide a further understanding of the present disclosure. The exemplary embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation to the present disclosure.

[0030] Figure 1 A side view of the high-frequency transformer body structure according to an embodiment of the present disclosure;

[0031] Figure 2 This is a front view of the high-frequency transformer body structure according to an embodiment of the present disclosure;

[0032] Figure 3 A top view of the high-frequency transformer body structure according to an embodiment of the present disclosure;

[0033] Figure 4 Schematic diagram of the magnetic core structure of an embodiment of the present disclosure;

[0034] Figure 5 is a schematic cross-sectional view of a high-frequency transformer according to an embodiment of the present disclosure;

[0035] Figure 6 is a circuit schematic diagram of a first transformer in a high-frequency transformer according to an embodiment of the present disclosure;

[0036] Figure 7 Schematic diagram of the magnetic flux principle of the high-frequency transformer core according to an embodiment of the present disclosure;

[0037] Figure 8 Schematic diagram of the leakage flux of the secondary auxiliary winding of the high-frequency transformer in an embodiment of the present disclosure.

[0038] Among them, 1. first main magnetic core column; 2. second main magnetic core column; 3. first auxiliary magnetic core column; 4. square magnetic core side column; 5. first primary winding; 6. first secondary winding; 7. second secondary auxiliary winding; 8. second auxiliary magnetic core column; 9. second primary winding; 10. second secondary winding; 11. first secondary auxiliary winding.

[0039] Among them, U p 、N p1 、R p 、X pσ 、U s 、N s1 、N a1 、R s 、X sσ 、X aσ They are respectively the input voltage, primary winding turns, primary winding resistance, primary winding leakage reactance, output voltage, secondary winding turns, secondary auxiliary winding turns, secondary winding resistance, secondary winding leakage reactance, and secondary auxiliary winding leakage reactance of the first transformer. DETAILED DESCRIPTION

[0040] The present disclosure will be further described below with reference to the accompanying drawings and embodiments.

[0041] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present disclosure belongs.

[0042] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0043] Example 1

[0044] In one embodiment of the present disclosure, a magnetic integrated high-frequency transformer core structure is provided, which effectively improves the power density and efficiency of the high-frequency transformer while achieving a smaller magnetic device volume, reduces transformer losses, and is conducive to improving the reliability and miniaturization of power electronic devices. Figure 1As shown, it includes two square magnetic core side columns 4, a first main magnetic core column 1, a second main magnetic core column 2, a first auxiliary magnetic core column 3 and a second auxiliary magnetic core column 8. The two square magnetic core side columns 4 are placed parallel to each other, and the first main magnetic core column 1 and the second main magnetic core column 2 are placed parallel and vertically between the two square magnetic core side columns 4, and the two ends of the first main magnetic core column 1 and the second main magnetic core column 2 are respectively fixedly connected to the two ends of the two square magnetic core side columns 4; the first main magnetic core column 1 and the second main magnetic core column 2 are arranged between the two square magnetic core side columns 4 parallel to each other, and are fixed at both ends.

[0045] The two square magnetic core side columns 4 are hollowed out in the middle, and a gap is left in the middle of each square magnetic core side column 4. The first auxiliary magnetic core column 3 and the second auxiliary magnetic core column 8 are placed vertically and parallel on both sides of the hollowing and are fixedly connected to the two square magnetic core side columns 4; windings are provided on the two main magnetic core columns and the two auxiliary magnetic core columns, and the square magnetic core side columns are fixed to the main and auxiliary magnetic core columns, serving as magnetic flux channels connecting the main and auxiliary magnetic core columns.

[0046] Furthermore, the windings include windings of a first transformer and windings of a second transformer. The first transformer's first primary winding 5 and first secondary winding 6 are wound on the first main magnetic core leg 1, while the second transformer's second primary winding 9 and second secondary winding 10 are wound on the second main magnetic core leg 2. Both sets of primary and secondary windings employ an overlapping structure, with the primary and secondary windings overlapping vertically along the two main magnetic core legs. The overlapping winding structure offers high mechanical strength, convenient wiring, and ease of insulation. Furthermore, this structure makes the windings more compact, improving the transformer's efficiency and power density.

[0047] Furthermore, the first secondary winding 6 and the second secondary winding 10 are respectively connected in series to the first secondary auxiliary winding 11 and the second secondary auxiliary winding 7. The first secondary auxiliary winding 11 and the second secondary auxiliary winding 7 are arranged in an overlapping manner and are wound as a whole on the secondary magnetic core column, that is, they are wound along two secondary magnetic core columns, leaving a gap in the middle, and are placed overlapping with each other in the vertical direction of the secondary magnetic core column, which helps to dissipate heat.

[0048] The winding directions of the first and second secondary auxiliary windings 11 and 7 are opposite to those of the first and second secondary windings 6 and 10. For example, if the secondary winding is wound counterclockwise on the main magnetic core leg, the secondary auxiliary winding should be wound clockwise on the secondary magnetic core leg. This allows the secondary auxiliary winding and the secondary winding to generate magnetic flux in the same direction in the magnetic core, jointly fulfilling the demagnetization function.

[0049] Considering the skin effect of the winding at high frequencies, the winding conductors are made of copper foil or Litz wire to minimize the concentrated distribution of current on the surface of the conductor, thereby improving the high-frequency performance of the transformer.

[0050] Furthermore, the first main magnetic core column 1, the second main magnetic core column 2, the first auxiliary magnetic core column 3, the second auxiliary magnetic core column 8 and the two square magnetic core side columns 4 are all made of isotropic magnetic materials to ensure that the magnetic core has the same magnetic permeability in different directions, and the magnetic permeability of the main magnetic core column and the auxiliary magnetic core column is much greater than the magnetic permeability of the square magnetic core side column, thereby realizing the decoupling integration of the first transformer and the second transformer.

[0051] The first transformer and the second transformer respectively include a main magnetic core column, two auxiliary magnetic core columns, and half of the upper and lower square magnetic core side columns connecting the main magnetic core column and the auxiliary magnetic core column.

[0052] Among them, the first main magnetic core column 1, the second main magnetic core column 2, the first auxiliary magnetic core column 3, and the second auxiliary magnetic core column 8 are all made of high-permeability materials; the square core side column 4 is made of ordinary magnetic permeability material (the magnetic permeability of ordinary magnetic permeability materials ranges from tens to thousands, while the magnetic permeability of high-permeability materials can reach tens of thousands or hundreds of thousands). The main and auxiliary magnetic core columns form a low-reluctance magnetic circuit. For the first transformer, the magnetic flux generated by the first primary winding is mainly distributed along the low-reluctance magnetic circuit, and the magnetic flux forms a magnetic flux loop along the direction of the first main magnetic core column-upper square magnetic core side column-two auxiliary magnetic core columns-lower square magnetic core side column-first main magnetic core column. The same is true for the second transformer. Therefore, the decoupling integration of the two transformers is achieved on the magnetic core of this structure. This effectively improves the power density and efficiency of the high-frequency transformer on the basis of a smaller magnetic core volume.

[0053] The first main magnetic core leg 1, the second main magnetic core leg 2, the first auxiliary magnetic core leg 3, and the second auxiliary magnetic core leg 8 have the same cross-sectional area to ensure uniform magnetic flux density. The width of the square magnetic core leg 4 is equal to the width of the first main magnetic core leg 1, the second main magnetic core leg 2, the first auxiliary magnetic core leg 3, and the second auxiliary magnetic core leg 8. The width of the square magnetic core leg is equal to the width of the main and auxiliary magnetic core legs. When the winding is energized, the magnetic flux generated flows through the main and auxiliary magnetic core legs and the square magnetic core leg, fully utilizing the magnetic core material.

[0054] As an embodiment, the secondary winding is connected in series with the secondary auxiliary winding. The two secondary auxiliary windings are overlapped and wound on two secondary magnetic cores. They are placed overlapping with each other along the height direction of the secondary magnetic cores. The leakage magnetic reactance X generated by the secondary auxiliary winding is σ It can be calculated by formula (1):

[0055]

[0056] Among them, f is the excitation frequency of the high-frequency transformer, N a is the number of turns of the secondary auxiliary winding, μ0 is the magnetic permeability of air, μ0=4π×10 -7 H / m, A0 and l0 are the cross-sectional area and length of the air magnetic circuit respectively.

[0057] By adjusting the number of turns of the secondary auxiliary winding, the leakage flux of the secondary auxiliary winding in the hollow of the magnetic core is adjusted, thereby achieving precise modulation of the leakage inductance, effectively avoiding the negative effects such as loss, heat and noise caused by opening an air gap on the magnetic core.

[0058] The winding direction of the secondary auxiliary winding is opposite to that of the secondary winding, ensuring that the secondary auxiliary winding and the secondary winding generate magnetic fluxes of the same direction in the magnetic core.

[0059] The number of turns of the primary winding of the first transformer is N p1 , the number of turns of the secondary winding is N s1 , the number of turns of the secondary auxiliary winding is N a1 The secondary auxiliary winding is mainly used to provide leakage inductance and has little effect on the magnetic flux flowing through the primary winding and the secondary winding in the magnetic core. p1 / (N s1 +N a1 )≈N p1 / N s1 , the voltage ratio of the first transformer is approximately N p1 / N s1 The same applies to the second transformer.

[0060] Example 2

[0061] In one embodiment of the present disclosure, a leakage inductance control method for a magnetic core structure of a magnetically integrated high-frequency transformer is provided. Based on the structure described in Example 1, the method includes two square magnetic core side columns, a first main magnetic core column, a second main magnetic core column, a first auxiliary magnetic core column and a second auxiliary magnetic core column. The two square magnetic core side columns are placed parallel to each other, the first main magnetic core column and the second main magnetic core column are placed parallel and vertically between the two square magnetic core side columns, and the two ends of the first main magnetic core column and the second main magnetic core column are respectively fixedly connected to the two ends of the two square magnetic core side columns; the two square magnetic core side columns are hollowed out in the middle, the first auxiliary magnetic core column and the second auxiliary magnetic core column are placed parallel and vertically on both sides of the hollowing, and are fixedly connected to the two square magnetic core side columns; windings are provided on the two main magnetic core columns and the two auxiliary magnetic core columns, and the square magnetic core side columns are fixed to the main and auxiliary magnetic core columns to serve as magnetic flux channels connecting the main and auxiliary magnetic core columns.

[0062] As an embodiment, a method for controlling leakage inductance of a magnetic core structure of a magnetically integrated high-frequency transformer includes:

[0063] The secondary winding and the secondary auxiliary winding are connected in series. The two secondary auxiliary windings are overlapped and wound on two secondary magnetic core columns as a whole. They are placed overlapping with each other along the height direction of the secondary magnetic core columns.

[0064] The leakage magnetic reactance X generated by the secondary auxiliary winding σ Calculated as:

[0065]

[0066] Among them, f is the excitation frequency of the high-frequency transformer, N a is the number of turns of the secondary auxiliary winding, μ0 is the magnetic permeability of air, μ0=4π×10 -7 H / m, A0 and l0 are the cross-sectional area and length of the air magnetic circuit respectively.

[0067] By adjusting the number of turns of the secondary auxiliary winding, the leakage flux of the secondary auxiliary winding in the hollow of the magnetic core is adjusted, thereby achieving precise modulation of the leakage inductance, effectively avoiding the negative effects such as loss, heat and noise caused by opening an air gap on the magnetic core.

[0068] The winding direction of the secondary auxiliary winding is opposite to that of the secondary winding, ensuring that the secondary auxiliary winding and the secondary winding generate magnetic flux in the same direction in the magnetic core. Figure 7 As shown, the magnetic flux of the first transformer forms a magnetic flux loop along the direction of the first main magnetic core column - the upper square magnetic core side column - the two auxiliary magnetic core columns - the lower square magnetic core side column - the first main magnetic core column. The same is true for the second transformer. Figure 8 As shown in FIG, the leakage magnetic flux generated by the secondary auxiliary winding passes through the hollowed-out portions of the upper and lower square core side columns to form a magnetic flux loop.

[0069] The number of turns of the primary winding of the first transformer is N p1 , the number of turns of the secondary winding is N s1 , the number of turns of the secondary auxiliary winding is N a1 , where the secondary auxiliary winding turns N a1 Smaller. According to N p1 / (N s1 +N a1 )≈N p1 / N s1 , the voltage ratio of the first transformer is approximately N p1 / N s1 The same applies to the second transformer.

[0070] The present disclosure is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present disclosure. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0071] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0072] Although the above describes the specific implementation methods of the present disclosure in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present disclosure. Those skilled in the art should understand that on the basis of the technical solution of the present disclosure, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present disclosure.

Claims

1. A magnetic integrated high-frequency transformer core structure, characterized in that: The magnetic core comprises two square magnetic core side columns, a first main magnetic core column, a second main magnetic core column, a first auxiliary magnetic core column and a second auxiliary magnetic core column. The two square magnetic core side columns are placed parallel to each other, the first main magnetic core column and the second main magnetic core column are placed parallel and vertically between the two square magnetic core side columns, and the two ends of the first main magnetic core column and the second main magnetic core column are respectively fixedly connected to the two ends of the two square magnetic core side columns; the two square magnetic core side columns are hollowed out in the middle, the first auxiliary magnetic core column and the second auxiliary magnetic core column are placed parallel and vertically on both sides of the hollowing, and are fixedly connected to the two square magnetic core side columns; windings are provided on the two main magnetic core columns and the two auxiliary magnetic core columns, and the square magnetic core side columns are fixed to the main and auxiliary magnetic core columns to serve as magnetic flux channels connecting the main and auxiliary magnetic core columns; The first primary winding and the first secondary winding of the first transformer are wound on the first main magnetic core leg, and the second primary winding and the second secondary winding of the second transformer are wound on the second main magnetic core leg, and both sets of primary windings and secondary windings are arranged in an overlapping manner, overlapping each other in a vertical direction along the two main magnetic core legs; The first secondary winding and the second secondary winding are connected in series to the first secondary auxiliary winding and the second secondary auxiliary winding respectively. The first secondary auxiliary winding and the second secondary auxiliary winding are arranged in an overlapping manner and are wound on the auxiliary magnetic core column as a whole. They are placed overlapping with each other in the vertical direction of the auxiliary magnetic core column. By adjusting the number of turns of the secondary auxiliary winding, the leakage inductance of the magnetically integrated high-frequency transformer can be precisely modulated, effectively avoiding the negative effects of loss, heat and noise caused by opening an air gap on the magnetic core.

2. The magnetic core structure of a magnetically integrated high-frequency transformer according to claim 1, characterized in that: The first main magnetic core column, the second main magnetic core column, the first auxiliary magnetic core column, the second auxiliary magnetic core column and the two square magnetic core side columns are all made of isotropic magnetic material, and the magnetic permeability of the main magnetic core column and the auxiliary magnetic core column is greater than the magnetic permeability of the square magnetic core side column.

3. The magnetic core structure of a magnetically integrated high-frequency transformer according to claim 1, characterized in that: The first main magnetic core leg, the second main magnetic core leg, the first auxiliary magnetic core leg and the second auxiliary magnetic core leg have the same cross-sectional area.

4. The magnetic core structure of a magnetically integrated high-frequency transformer according to claim 1, characterized in that: The width of the side columns of the square magnetic core is equal to the width of the first main magnetic core column, the second main magnetic core column, the first auxiliary magnetic core column and the second auxiliary magnetic core column.

5. The magnetic core structure of a magnetically integrated high-frequency transformer according to claim 1, characterized in that: The winding directions of the first secondary auxiliary winding and the second secondary auxiliary winding are opposite to the winding directions of the first secondary winding and the second secondary winding.

6. The magnetic core structure of a magnetically integrated high-frequency transformer according to claim 1, characterized in that: The winding conductors are made of copper foil or Litz wire.

7. The leakage inductance control method of the magnetic core structure of the magnetic integrated high-frequency transformer according to any one of claims 1 to 6, characterized in that: The leakage reactance generated by the first secondary auxiliary winding and the second secondary auxiliary winding Calculated as: in, is the excitation frequency of the high-frequency transformer, is the number of turns of the secondary auxiliary winding, is the magnetic permeability of air, =4 ×10 -7 H / m, 、 are the cross-sectional area and length of the air magnetic circuit respectively.

8. The leakage inductance control method of the magnetic core structure of the magnetic integrated high-frequency transformer according to claim 7, characterized in that: include: By adjusting the number of turns of the secondary auxiliary winding, the leakage flux of the secondary auxiliary winding at the hollowed-out parts of the two square core side columns is adjusted, thereby achieving precise modulation of the leakage inductance. The number of turns of the first primary winding of the first transformer is N p1 , the number of turns of the first secondary winding is N s1 , the number of turns of the first secondary auxiliary winding is N a1 The secondary auxiliary winding is mainly used to provide leakage inductance and has little effect on the magnetic flux flowing through the primary winding and the secondary winding in the magnetic core. p1 / (N s1 +N a1 )≈N p1 / N s1 , the voltage ratio of the first transformer is approximately N p1 / N s1 , the same applies to the second transformer.

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