Magnetic core structure and magnetic integrated transformer

Abstract

The utility model provides a magnetic core structure and a magnetic integrated transformer, the magnetic core structure comprises a first magnetic core base, a second magnetic core base, a first magnetic core column, a second magnetic core column, a third magnetic core column and a fourth magnetic core column, the first magnetic core base and the second magnetic core base are arranged in parallel; the first magnetic core column, the second magnetic core column, the third magnetic core column and the fourth magnetic core column are connected between the first magnetic core base and the second magnetic core base, every two connecting lines of geometric center points of the cross sections of the first magnetic core column, the second magnetic core column and the third magnetic core column form a triangle, and the geometric center point of the cross section of the fourth magnetic core column is located in the triangle. According to the magnetic core structure and the magnetic integrated transformer provided by the invention, due to the geometric structure of the magnetic core design, the magnetic flux path is more symmetrical, so that the offset of the ripple current is more perfect.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to a magnetic core structure and a magnetic integrated transformer. Background Art

[0002] LLC resonant circuit topology is the most popular circuit topology in the switching power supply industry. Figure 1 The figure shows a schematic diagram of a single-phase LLC resonant circuit topology in the prior art. The main reason why this topology is favored by the industry is that its primary-side switch tube can achieve zero voltage turn-on, and the secondary-side switch tube can achieve zero current turn-off, thereby achieving high efficiency at a high switching frequency.

[0003] With the development of the power electronics industry, people's demand for switching power supplies is increasing. Figure 1 The single-phase LLC resonant circuit topology shown in Figure 1 is no longer sufficient and is replaced by a three-phase LLC resonant circuit topology (such as Figure 2 As shown in the figure, the three-phase LLC resonant circuit is composed of three identical LLC resonant circuits connected in parallel with a current phase difference of 120 degrees, including three resonant cavities and three transformers. These three LLC resonant circuits are connected in parallel and the output current phases differ by 120 degrees. In theory, the output ripple currents can cancel each other out, which can greatly reduce the demand for output capacitors, thereby reducing the size of the power supply and reducing the cost of the power supply.

[0004] However, the three-phase LLC resonant circuit requires three transformers. Therefore, if the current phase relationship of the three LLC resonant circuits can be used to perform magnetic integration design on the three transformers, the size of the transformer can be reduced, the magnetic loss can be reduced, and the conversion efficiency of the power supply can be improved. The industry has made some attempts at magnetic integration of three-phase LLC and proposed some core structure designs. One core structure is to arrange three winding magnetic columns in a row, and add a side column on each side. There is another core structure in which three winding magnetic columns are arranged in a row, and a magnetic column is added between two adjacent winding magnetic columns. However, these two structures will cause the problem of imperfect output ripple current cancellation due to the asymmetry of the geometric structure. Utility Model Content

[0005] In view of this, the present invention provides a magnetic core structure and a magnetic integrated transformer to solve at least one of the above-mentioned problems.

[0006] In order to achieve the above purpose, the utility model adopts the following scheme:

[0007] According to the first aspect of the present application, the present application provides a magnetic core structure, which includes: a first magnetic core base, a second magnetic core base, a first magnetic core column, a second magnetic core column, a third magnetic core column and a fourth magnetic core column, the first magnetic core base and the second magnetic core base are arranged in parallel, the first magnetic core column, the second magnetic core column, the third magnetic core column and the fourth magnetic core column are connected between the first magnetic core base and the second magnetic core base, the lines connecting the geometric center points of the cross sections of the first magnetic core column, the second magnetic core column and the third magnetic core column form a triangle, and the geometric center point of the cross section of the fourth magnetic core column is located inside the triangle.

[0008] As an embodiment of the present invention, the triangle is an equilateral triangle.

[0009] As an embodiment of the present utility model, the magnetic core structure further includes: a fifth magnetic core column, and the geometric center point of the cross section of the fifth magnetic core column is located outside the triangle.

[0010] As an embodiment of the present utility model, the magnetic core structure further includes: a sixth magnetic core column, and the geometric center point of the cross section of the sixth magnetic core column is located outside the triangle.

[0011] As an embodiment of the present utility model, the magnetic core structure further includes: a seventh magnetic core column, and the geometric center point of the cross section of the seventh magnetic core column is located outside the triangle.

[0012] As an embodiment of the present invention, the cross-sections of the first magnetic core column, the second magnetic core column and the third magnetic core column are circular, and the cross-sections of the fourth magnetic core column, the fifth magnetic core column, the sixth magnetic core column and the seventh magnetic core column are of any geometric shape.

[0013] As an embodiment of the present invention, the fourth magnetic core column is formed by splicing or integrally forming.

[0014] As an embodiment of the present utility model, air gaps are respectively provided on the first magnetic core column, the second magnetic core column and the third magnetic core column, and the air gaps are located in the middle of the first magnetic core column, the second magnetic core column and the third magnetic core column.

[0015] As an embodiment of the present invention, air gaps are respectively provided on the first magnetic core column, the second magnetic core column and the third magnetic core column, and the air gaps are located at the end positions of the first magnetic core column, the second magnetic core column and the third magnetic core column.

[0016] According to a second aspect of the present application, a magnetic integrated transformer is provided, wherein the magnetic integrated transformer adopts a magnetic core structure as described in any one of the above claims, and a first winding, a second winding, and a third winding are respectively wound on the first magnetic core column, the second magnetic core column, and the third magnetic core column to form a closed magnetic flux loop.

[0017] It can be seen from the above technical solution that the magnetic core structure and magnetic integrated transformer provided by the present application, due to the geometric structure of the magnetic core design, make the magnetic flux path generated by it more symmetrical, so the ripple current cancellation is more perfect, and the existence of the fifth, sixth and seventh magnetic core columns makes the magnetic core structure more stable after the air gap is opened. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0019] Figure 1 It is a topological schematic diagram of a single-phase LLC resonant circuit in the prior art;

[0020] Figure 2 It is a topological schematic diagram of a three-phase LLC resonant circuit in the prior art;

[0021] Figure 3 is a structural schematic diagram of a magnetic core structure provided in an embodiment of the present application;

[0022] Figure 4 is a cross-sectional view of a magnetic core structure provided in one embodiment of the present application;

[0023] Figure 5 is a cross-sectional view of a magnetic core structure provided by another embodiment of the present application;

[0024] Figure 6 is a cross-sectional view of a magnetic core structure provided by another embodiment of the present application;

[0025] Figure 7 is a cross-sectional view of a magnetic core structure provided by another embodiment of the present application;

[0026] Figure 8 is a cross-sectional view of a magnetic core structure provided by another embodiment of the present application;

[0027] Fig. 9 is a cross-sectional view of a magnetic core structure provided by another embodiment of the present application;

[0028] Fig.10is a structural schematic diagram of a magnetic core structure provided by another embodiment of the present application;

[0029] Fig.11 It is a structural schematic diagram of a magnetic integrated transformer provided in an embodiment of the present application. DETAILED DESCRIPTION

[0030] It should be noted that the term "comprises" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method / process, system, product or equipment that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods / processes, products or equipment.

[0031] In the present invention, the terms "upper", "lower", "inner", "outer", "middle", "top" and "bottom" indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have specific positions, or to be constructed and operated in specific positions.

[0032] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0033] In addition, the terms "disposed" and "connected" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0034] like Figure 3 The figure shows a structural schematic diagram of a magnetic core structure provided in an embodiment of the present application, which includes: a first magnetic core base 1, a second magnetic core base 2, a first magnetic core column 3, a second magnetic core column 4, a third magnetic core column 5 and a fourth magnetic core column 6, the first magnetic core base 1 and the second magnetic core base 2 are arranged in parallel, and the first magnetic core column 3, the second magnetic core column 4, the third magnetic core column 5 and the fourth magnetic core column 6 are connected between the first magnetic core base 1 and the second magnetic core base 2.

[0035] The first magnetic core base 1 and the second magnetic core base 2 serve as the basis of the entire magnetic core structure, providing a stable platform to support and fix the four magnetic core columns (the first magnetic core column 3, the second magnetic core column 4, the third magnetic core column 5 and the fourth magnetic core column 6), which ensures that the relative positions of the magnetic core columns remain unchanged, thereby maintaining the stability and symmetry of the geometric structure.

[0036] The lines connecting the geometric center points of the cross sections of the first magnetic core column 3, the second magnetic core column 4 and the third magnetic core column 5 form a triangle, and the geometric center point of the cross section of the fourth magnetic core column 6 is located inside the triangle. For details, see Figure 4 , which is a cross-sectional view of a magnetic core structure provided in one embodiment of the present application.

[0037] The geometric center points of the first magnetic core column 3, the second magnetic core column 4 and the third magnetic core column 5 form a triangle, which can ensure the geometric symmetry of the magnetic core structure. The symmetrical structure helps to evenly distribute the magnetic flux, reduce the stress and loss inside the magnetic core, and improve the overall efficiency. The fourth magnetic core column 6 is located inside the triangle, which can effectively utilize the space inside the triangle, further optimize the magnetic flux path, reduce magnetic flux leakage, and improve the performance of the magnetic integrated device. In addition, in the three-phase LLC resonant circuit, the phase difference of the three-phase current is 120 degrees. The geometric center points of the three magnetic core columns form a triangle, which can better match the phase relationship of the three-phase current, so that the magnetic flux is more evenly distributed in the magnetic core, reducing mutual interference, and the symmetrical triangle structure helps to more perfectly offset the output ripple current, thereby reducing the demand for output capacitance and reducing the volume and cost of the power supply.

[0038] In summary, the geometric center points of the first magnetic core column 3, the second magnetic core column 4 and the third magnetic core column 5 form a triangle, and the design that the fourth magnetic core column 6 is located inside the triangle can achieve geometric symmetry, optimize the current phase relationship and form a stable closed magnetic flux loop, thereby improving the performance and efficiency of the magnetic integrated device.

[0039] Preferably, in one embodiment of the present application, the triangle formed by the geometric center points of the cross sections of the first magnetic core column 3, the second magnetic core column 4 and the third magnetic core column 5 can be an equilateral triangle (such as Figure 5 Because the equilateral triangle has a stronger geometric symmetry, the resulting flux path is more symmetrical, which helps to cancel the output ripple current more perfectly.

[0040] Preferably, in one embodiment of the present application, Figure 6 As shown, the magnetic core structure also includes: a fifth magnetic core column 7, the geometric center point of the cross section of the fifth magnetic core column 7 is located outside the triangle, and the existence of the fifth magnetic core column 7 makes the magnetic core structure more stable after the air gap is opened, which helps to further optimize the magnetic flux distribution and reduce magnetic loss.

[0041] Preferably, in one embodiment of the present application, Figure 7 As shown, the magnetic core structure also includes: a sixth magnetic core column 8, the geometric center point of the cross section of the sixth magnetic core column 8 is located outside the above triangle, and the function of the sixth magnetic core column 8 is consistent with that of the fifth magnetic core column 7, both of which help to make the magnetic core structure more stable after the air gap is opened.

[0042] Preferably, in one embodiment of the present application, Figure 8 As shown, the magnetic core structure also includes: a seventh magnetic core column 9, the geometric center point of the cross section of the seventh magnetic core column is also located outside the above triangle. The function of the seventh magnetic core column 9 is to make the magnetic core structure more stable after the air gap is opened together with the fifth magnetic core column 7 and the sixth magnetic core column 8. Further preferably, the angle between the fifth magnetic core column 7, the sixth magnetic core column 8 and the seventh magnetic core column 9 and the orthocenter line of the above triangle is 120°.

[0043] Preferably, the cross-sections of the first magnetic core column 3, the second magnetic core column 4 and the third magnetic core column 5 are circular, and the cross-sections of the fourth magnetic core column 6, the fifth magnetic core column 7, the sixth magnetic core column 8 and the seventh magnetic core column 9 can be any geometric shape, such as Fig. 9 As shown, the fourth magnetic core column 6 is a hexagonal structure with three arc-shaped sides, and the fifth magnetic core column 7, the sixth magnetic core column 8 and the seventh magnetic core column 9 are all hexagonal structures with two arc-shaped sides. Of course, the cross-sectional shapes of the first magnetic core column 3, the second magnetic core column 4 and the third magnetic core column 5 of the present application can also be elliptical or rectangular.

[0044] Preferably, the fourth magnetic core column 6 is spliced ​​or integrally formed. If spliced, it can be spliced ​​in the middle, which can save mold opening costs. Of course, the fifth magnetic core column 7, the sixth magnetic core column 8 and the seventh magnetic core column 9 can also be spliced ​​or integrally formed. In order to save costs, the fourth magnetic core column 6, the fifth magnetic core column 7, the sixth magnetic core column 8 and the seventh magnetic core column 9 are all spliced ​​or integrally formed.

[0045] Preferably, Figure 1 As shown, air gaps are respectively provided on the first magnetic core column 3, the second magnetic core column 4 and the third magnetic core column 5, and the air gaps are located in the middle of the first magnetic core column 3, the second magnetic core column 4 and the third magnetic core column 5. The air gaps are provided in the middle of the first magnetic core column 3, the second magnetic core column 4 and the third magnetic core column 5, so that the magnetic field can be evenly distributed in the magnetic core column, reducing the risk of local magnetic saturation, thereby improving the working efficiency and stability of the transformer, and optimizing the magnetic flux path, so that the magnetic flux is more evenly distributed in the magnetic core, reducing magnetic loss. In addition, the position of the air gap affects the magnetic energy storage capacity of the magnetic core. The air gap in the middle position can effectively increase the magnetic energy storage capacity of the magnetic core, which is helpful for storing and releasing energy in high-frequency switching power supplies.

[0046] Preferably, Fig.10 As shown, the first magnetic core column 3, the second magnetic core column 4 and the third magnetic core column 5 are respectively provided with air gaps, which are located at the end positions of the first magnetic core column 3, the second magnetic core column 4 and the third magnetic core column 5. The air gaps are provided at the end positions of the first magnetic core column 3, the second magnetic core column 4 and the third magnetic core column 5 to reduce the magnetic leakage phenomenon in the magnetic core, thereby improving the efficiency and performance of the transformer.

[0047] like Fig.11 What is shown is a structural schematic diagram of a magnetic integrated transformer provided in an embodiment of the present application. The magnetic integrated transformer adopts the magnetic core structure as described above. The first winding, the second winding, and the third winding are respectively wound on the above-mentioned first magnetic core column, the second magnetic core column, and the third magnetic core column to form a closed magnetic flux loop, thereby forming a three-phase magnetic integrated transformer.

[0048] It can be seen from the above technical solution that the magnetic integrated transformer provided in the present application, due to the geometric structure of the magnetic core design, makes the magnetic flux path it generates more symmetrical, so the ripple current is more perfectly offset, and the existence of the fifth, sixth and seventh magnetic core columns makes the core structure more stable after the air gap is opened.

[0049] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific embodiment of the utility model and is not intended to limit the scope of protection of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. A magnetic core structure, characterized in that: The magnetic core structure includes: a first magnetic core base, a second magnetic core base, a first magnetic core column, a second magnetic core column, a third magnetic core column and a fourth magnetic core column, the first magnetic core base and the second magnetic core base are arranged in parallel, the first magnetic core column, the second magnetic core column, the third magnetic core column and the fourth magnetic core column are connected between the first magnetic core base and the second magnetic core base, the lines connecting the geometric center points of the cross sections of the first magnetic core column, the second magnetic core column and the third magnetic core column form a triangle, and the geometric center point of the cross section of the fourth magnetic core column is located inside the triangle.

2. The magnetic core structure according to claim 1, characterized in that: The triangle is an equilateral triangle.

3. The magnetic core structure according to claim 1, characterized in that: The magnetic core structure further includes: a fifth magnetic core column, a geometric center point of a cross section of the fifth magnetic core column is located outside the triangle.

4. The magnetic core structure according to claim 3, characterized in that: The magnetic core structure further includes: a sixth magnetic core column, a geometric center point of a cross section of the sixth magnetic core column is located outside the triangle.

5. The magnetic core structure according to claim 4, characterized in that: The magnetic core structure further includes: a seventh magnetic core column, a geometric center point of a cross section of the seventh magnetic core column is located outside the triangle.

6. The magnetic core structure according to claim 5, characterized in that: The cross-sections of the first magnetic core column, the second magnetic core column and the third magnetic core column are circular, and the cross-sections of the fourth magnetic core column, the fifth magnetic core column, the sixth magnetic core column and the seventh magnetic core column are arbitrary geometric shapes.

7. The magnetic core structure according to claim 1, characterized in that: The fourth magnetic core column is formed by splicing or integrally forming.

8. The magnetic core structure according to claim 1, characterized in that: Air gaps are respectively formed on the first magnetic core column, the second magnetic core column and the third magnetic core column, and the air gaps are located in the middle of the first magnetic core column, the second magnetic core column and the third magnetic core column.

9. The magnetic core structure according to claim 1, characterized in that: Air gaps are respectively formed on the first magnetic core column, the second magnetic core column and the third magnetic core column. The air gaps are located at the ends of the first magnetic core column, the second magnetic core column and the third magnetic core column.

10. A magnetic integrated transformer, characterized in that: The magnetic integrated transformer adopts the magnetic core structure as described in any one of claims 1 to 9, and the first winding, the second winding, and the third winding are respectively wound on the first magnetic core column, the second magnetic core column, and the third magnetic core column to form a closed magnetic flux loop.

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