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, and connecting lines of geometric center points of cross sections of the first magnetic core column, the second magnetic core column and the third magnetic core column form a straight line or an obtuse triangle with the obtuse angle larger than 150 degrees. The geometric center point of the cross section of the fourth magnetic core column is located on one side of the straight line or located outside the obtuse triangle. According to the magnetic integrated transformer, the distances of the first magnetic core column, the second magnetic core column and the third magnetic core column in the linear arrangement direction are shortened, the problem that the geometric dimension of the magnetic integrated transformer is limited is solved, and the size of the transformer can be further reduced.

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 Technique

[0002] The LLC resonant circuit topology is the most popular circuit topology in the current switching power supply industry. As Figure 1 shown in the schematic diagram of a single-phase LLC resonant circuit topology in the prior art, the main reason why this topology is favored in the industry is that the primary-side switching tube can achieve zero-voltage turn-on, while the secondary-side switching tube can achieve zero-current turn-off, so that high efficiency can be achieved at a high switching frequency.

[0003] With the development of the power electronics industry, people's power demand for switching power supplies is increasing. Figure 1 The single-phase LLC resonant circuit topology shown can no longer meet the requirements. Instead, a three-phase LLC resonant circuit topology (as Figure 2 shown) is used. The three-phase LLC resonant circuit is composed of three identical LLC resonant circuits with a 120-degree phase difference in current in parallel, including three resonant cavities and three transformers. The three LLC resonant circuits are connected in parallel to output, and the output current phases are 120 degrees different. Theoretically, the output ripple currents can cancel each other out, so that the demand for output capacitors can be greatly reduced, and thus the volume of the power supply can be reduced and the cost of the power supply can be lowered.

[0004] However, the three-phase LLC resonant circuit requires three transformers. If the current phase relationship of the three LLC resonant circuits can be utilized to conduct a magnetic integration design for these three transformers, the volume of the transformers can be reduced, the magnetic loss can be lowered, and the conversion efficiency of the power supply can be improved. Some attempts have been made in the industry on the magnetic integration of the three-phase LLC, and some magnetic core structure designs have been proposed. One magnetic core structure is to arrange three winding magnetic columns in a row and add a side column on each side; another magnetic core structure is also to arrange three winding magnetic columns in a row and add a magnetic column between adjacent two winding magnetic columns. However, these two magnetic core structures have a common defect: all the magnetic columns are arranged in a straight line. The geometric size of the magnetic integrated transformer designed with such a magnetic core structure will be restricted by the magnetic core columns and the winding space in the straight line direction, which is not conducive to reducing the volume of the transformer. Summary of the Utility Model

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

[0006] To achieve the above purpose, the utility model adopts the following solutions:

[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 connection lines of 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 straight line or an obtuse triangle with an obtuse angle greater than 150°. The geometric center point of the cross-section of the fourth magnetic core column is located on one side of the straight line or outside the obtuse triangle.

[0008] As an embodiment of the present invention, the longest distance from the geometric center point of the fourth magnetic core column to the first magnetic core column, the second magnetic core column and the third magnetic core column is a first distance, and the longest distance between the geometric center points of the first magnetic core column, the second magnetic core column and the third magnetic core column is a second distance. The first distance is less than the second distance.

[0009] As an embodiment of the present invention, the fourth magnetic core column is a long strip-shaped side column.

[0010] As an embodiment of the present invention, the fourth magnetic core column is composed of two independent long strip-shaped side columns, and the two independent long strip-shaped side columns are on the same straight line.

[0011] As an embodiment of the present invention, the fourth magnetic core column is composed of at least three independent side columns, and the independent side columns are on the same straight line.

[0012] As an embodiment of the present invention, the independent side columns at both ends of the same straight line in the fourth magnetic core column are long strip-shaped side columns, and the other independent side columns are cylindrical side columns.

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

[0014] As an embodiment of the present invention, 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 at the middle positions 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 formed 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 the second aspect of the present application, the present application provides a magnetically integrated transformer. The magnetically integrated transformer adopts the magnetic core structure as described in the above claims. The first winding, the second winding, and the third winding are respectively wound around the first magnetic core column, the second magnetic core column, and the third magnetic core column to form a closed magnetic flux loop.

[0017] As can be seen from the above technical solutions, for the magnetic core structure and the magnetically integrated transformer provided by the present application, since the fourth magnetic core column is placed on one side of the straight line formed by the first magnetic core column, the second magnetic core column, and the third magnetic core column or outside the obtuse triangle formed, the distance of the first magnetic core column, the second magnetic core column, and the third magnetic core column in the straight line arrangement direction is shortened, solving the problem of limited geometric dimensions of the magnetically integrated transformer, and the volume of the transformer can be further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. In the drawings:

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

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

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

[0022] Figure 4 is a sectional view of the magnetic core structure provided by an embodiment of the present application;

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

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

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

[0026] Figure 8 is a schematic structural diagram of a magnetic core structure provided by another embodiment of the present application;

[0027] Figure 9It is a schematic structural diagram of a magnetic integrated transformer provided by an embodiment of the present application. Detailed implementation manners

[0028] It should be noted that the term "including" and any of its variations in the description and claims of the present utility model and the above-mentioned drawings are intended to cover non-exclusive inclusion. For example, a process, method / technique, system, product or device that includes a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods / techniques, products or devices.

[0029] In the present utility model, the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", "middle", "top" and "bottom" is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present utility model and its embodiments, and are not used to limit that the indicated device, element or component must have a specific orientation or be constructed and operated in a specific orientation.

[0030] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above-mentioned terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present utility model can be understood according to specific circumstances.

[0031] In addition, the terms "arrange" and "connect" should be understood in a broad sense. For example, "connect" 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 directly connected, or indirectly connected through an intermediate medium, or there is internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present utility model can be understood according to specific circumstances.

[0032] As Figure 3 shown is a schematic structural diagram of a magnetic core structure provided by 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.

[0033] The first magnetic core base 1 and the second magnetic core base 2 serve as the foundation 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). This ensures that the relative positions of the magnetic core columns remain unchanged, thus maintaining the stability and symmetry of the geometric structure.

[0034] The connecting lines of 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 straight line or an obtuse triangle with an obtuse angle greater than 150°. The geometric center point of the cross-section of the fourth magnetic core column 6 is located on one side of this straight line or outside the obtuse triangle. For details, please refer to Figure 4 and Figure 5 , where Figure 4 in, the connecting lines of 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 straight line, and the geometric center point of the cross-section of the fourth magnetic core column 6 is located on one side of this straight line; Figure 5 in, the connecting lines of 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 an obtuse triangle, and the geometric center point of the cross-section of the fourth magnetic core column 6 is located outside this obtuse triangle.

[0035] Preferably, in an embodiment of the present application, the longest distance from the geometric center point of the fourth magnetic core column 6 to the first magnetic core column 3, the second magnetic core column 4, and the third magnetic core column 5 is the first distance, and the longest distance between the geometric center points of the first magnetic core column 3, the second magnetic core column 4, and the third magnetic core column 5 is the second distance. This first distance is less than the second distance. That is, it is restricted that the position of the fourth magnetic core column 6 should not be too far from the first magnetic core column 3, the second magnetic core column 4, and the third magnetic core column 5, so as not to be disadvantageous to further reducing the volume of the transformer.

[0036] Preferably, in an embodiment of the present application, the fourth magnetic core column 6 is a long strip-shaped side column. For details, please also refer to Figure 4 and Figure 5 , where Figure 4 the long strip-shaped side column in is longer than Figure 5 the side column in, Figure 4 the fourth magnetic core column 6 in can provide a more stable supporting effect, but the consumables will be Figure 5 more.

[0037] Preferably, in an embodiment of the present application, the fourth magnetic core column 6 is composed of two independent long strip-shaped side columns, and these two independent long strip-shaped side columns are on the same straight line. For details, please refer to Figure 6 , from Figure 6 it can be seen that the consumables of its fourth magnetic core column 6 are less than those in Figure 4 , and the supporting force is better than that in Figure 5 .

[0038] Preferably, in an embodiment of the present application, the fourth magnetic core column 6 is composed of at least 3 independent side columns, and the independent side columns are on the same straight line. And in this embodiment, the independent side columns at both ends of the fourth magnetic core column 6 on the same straight line are long strip-shaped side columns, and the other independent side columns are cylindrical side columns. For details, please refer to Figure 7 as shown. Of course, the fourth magnetic core column 6 of the present application can also adopt other shapes, such as rectangular side columns, oval side columns, other irregular side columns, etc. The present application does not limit this.

[0039] Preferably, the above-mentioned fourth magnetic core column 6 is formed by splicing or integrally formed. If it is formed by splicing, it can be spliced in the middle part, which can save the mold opening cost.

[0040] Preferably, as Figure 1 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 at the middle positions of the first magnetic core column 3, the second magnetic core column 4 and the third magnetic core column 5. Providing the air gaps at the middle positions of the first magnetic core column 3, the second magnetic core column 4 and the third magnetic core column 5 can make the magnetic field evenly distributed in the magnetic core column, reduce the risk of local magnetic saturation, thereby improving the working efficiency and stability of the transformer, and can also optimize the magnetic flux path, making the magnetic flux more evenly distributed in the magnetic core and reducing magnetic loss. In addition, the position of the air gap affects the magnetic energy storage capacity of the magnetic core. The air gap at the middle position can effectively increase the magnetic energy storage capacity of the magnetic core, which helps to store and release energy in the high-frequency switching power supply.

[0041] Preferably, as Figure 8 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 at the end positions of the first magnetic core column 3, the second magnetic core column 4 and the third magnetic core column 5. Providing the air gaps at the end positions of the first magnetic core column 3, the second magnetic core column 4 and the third magnetic core column 5 can reduce the magnetic leakage phenomenon in the magnetic core, thereby improving the efficiency and performance of the transformer.

[0042] As Figure 9 shown is a structural schematic diagram of a magnetic integrated transformer provided by 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 around the above-mentioned first magnetic core column, second magnetic core column and third magnetic core column to form a closed magnetic flux loop, thereby constituting a three-phase magnetic integrated transformer.

[0043] It can be seen from the above technical solutions that for the magnetic integrated transformer provided by the present application, due to the geometric structure symmetry and circuit structure symmetry of the magnetic core design, the cancellation of the ripple current is more perfect. Moreover, the existence of the fifth, sixth and seventh magnetic core columns makes the magnetic core structure more stable after the air gap is opened.

[0044] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present utility model. It should be understood that the above are only specific embodiments of the present utility model and are not used to limit the protection scope of the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present 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 connection lines of 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 straight line or an obtuse triangle with an obtuse angle greater than 150°. The geometric center point of the cross-section of the fourth magnetic core column is located on one side of the straight line or outside the obtuse triangle.

2. The magnetic core structure according to claim 1, wherein, The longest distance from the geometric center point of the fourth magnetic core column to the first magnetic core column, the second magnetic core column, and the third magnetic core column is a first distance, and the longest distance between the geometric center points of the first magnetic core column, the second magnetic core column, and the third magnetic core column is a second distance. The first distance is less than the second distance.

3. The magnetic core structure according to claim 1, characterized in that, The fourth magnetic core column is a long strip-shaped side column.

4. The magnetic core structure according to claim 1, wherein, The fourth magnetic core column is composed of two independent long strip-shaped side columns, and the two independent long strip-shaped side columns are on the same straight line.

5. The magnetic core structure according to claim 1, characterized in that, The fourth magnetic core column is composed of at least 3 independent side columns, and the independent side columns are on the same straight line.

6. The magnetic core structure according to claim 5, wherein, The independent side columns at both ends of the same straight line in the fourth magnetic core column are long strip-shaped side columns, and the other independent side columns are cylindrical side columns.

7. The magnetic core structure according to claim 1, wherein The fourth magnetic core column is formed by splicing or integrally formed.

8. The magnetic core structure according to claim 1, wherein, 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 at the middle positions 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, wherein, 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 at the end positions 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 1-9. 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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