Magnetic core structure and transformer

Abstract

Embodiments of the present application disclose a magnetic core structure and a transformer. The magnetic core structure comprises a first magnetic core and a second magnetic core; the first magnetic core comprises a first magnetic core main body and at least three first magnetic columns; the second magnetic core comprises a second magnetic core main body; the second magnetic core main body is arranged opposite to the first magnetic core main body; a mounting space is formed between every two adjacent first magnetic columns; the second magnetic core main body is provided with at least one air gap segment; one air gap segment corresponds to one mounting space; the air gap segment comprises a plurality of air gaps; each air gap cuts off the second magnetic core main body. According to the present application, the air gaps are formed in the second magnetic core main body, and among the magnetic leakage on the two sides of each air gap of the second magnetic core main body, only the magnetic leakage on the side close to a winding can influence the winding, and the magnetic leakage on the side away from the winding is located outside the magnetic core structure, so that a heating phenomenon of the winding caused by the influence of the magnetic leakage can be reduced. The first magnetic core main body is provided with a plurality of air gaps, the width of each air gap can be set to be smaller, and the smaller the generated magnetic leakage is, the less the heat generated by the winding is.

Description

Magnetic core structure and transformer

[0001] Related applications

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on November 17, 2023, with application number 202323122472.8 and invention name “Magnetic Core Structure and Transformer”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of transformers, and in particular to a magnetic core structure and a transformer. Background Art

[0004] Conventional transformers typically have an air gap in the core leg. Excessively large gaps can cause significant leakage of magnetic flux near the gap. These leaked flux forms eddy currents in the windings, generating heat and losses. The eddy currents are more severe the closer to the gap the more severe they are. Since the core leg is located in the middle of the winding, magnetic flux leakage in the air gap on the leg can cause significant heating of the windings, potentially leading to insulation failure. Summary of the Invention

[0005] The embodiments of the present application provide a magnetic core structure and a transformer, which are used to improve the problem in related technologies that the core center column is located in the middle of the winding, and the magnetic leakage in the air gap on the core center column will cause serious heating of the winding and easily lead to winding insulation failure.

[0006] In a first aspect, an embodiment of the present application provides a magnetic core structure, comprising:

[0007] a first magnetic core, the first magnetic core comprising a first magnetic core body and at least three first magnetic pillars, the at least three first magnetic pillars being spaced apart along an extension direction of the first magnetic core body, each of the first magnetic pillars being connected to the first magnetic core body, and the at least three first magnetic pillars being located on the same side of the first magnetic core body;

[0008] A second magnetic core, the second magnetic core is connected to the first magnetic core, the second magnetic core includes a second magnetic core body, and the second magnetic core body is arranged opposite to the first magnetic core body in a direction perpendicular to the extension direction of the first magnetic core body. The at least three first magnetic columns are located between the first magnetic core body and the second magnetic core body, so that an installation space for accommodating the winding is formed between each adjacent two first magnetic columns. The second magnetic core body is provided with at least one air gap section, one air gap section corresponds to one installation space, and the air gap section includes a plurality of air gaps spaced apart along the extension direction of the second magnetic core body, and each air gap disconnects the second magnetic core body.

[0009] In some embodiments, within the air gap section, a width of each air gap along the extension direction of the second magnetic core body is greater than or equal to 0.5 mm and less than or equal to 1 mm.

[0010] In some embodiments, the at least three first magnetic columns form at least two installation spaces, the second magnetic core body is provided with at least two air gap sections, and each air gap section corresponds to one installation space.

[0011] In some embodiments, the second magnetic core further comprises:

[0012] A fixing part connects the second magnetic core bodies separated by the air gap into one body, and the fixing part is a non-magnetic part.

[0013] In some embodiments, the fixing member includes:

[0014] A plurality of fixed cores are provided in each of the air gaps, and the fixed cores connect the two parts of the second magnetic core body separated by the corresponding air gap into one.

[0015] In some embodiments, the fixed core is an adhesive layer, and the adhesive layer fills the corresponding air gap.

[0016] In some embodiments, the second magnetic core body is connected to an end of each of the first magnetic columns that is away from the first magnetic core body.

[0017] In some embodiments, the first magnetic core includes three first magnetic columns, and the second magnetic core further includes:

[0018] Three second magnetic pillars are arranged at intervals along the extension direction of the second magnetic core body, and each second magnetic pillar is connected to the second magnetic core body. The three second magnetic pillars are located on the side of the second magnetic core body close to the first magnetic core body, and each second magnetic pillar corresponds to each first magnetic pillar.

[0019] In some embodiments, the first magnetic core includes four first magnetic columns, and the second magnetic core further includes:

[0020] Four second magnetic pillars are arranged at intervals along the extension direction of the second magnetic core body, and each second magnetic pillar is connected to the second magnetic core body. The four second magnetic pillars are located on the side of the second magnetic core body close to the first magnetic core body, and each second magnetic pillar corresponds to each first magnetic pillar.

[0021] In a second aspect, an embodiment of the present application provides a transformer, characterized in that it includes the above-mentioned magnetic core structure and a circuit board, at least a portion of the circuit board is located in the installation space, and the winding is formed on the circuit board.

[0022] In the magnetic core structure and transformer of the present application, the winding is located in the installation space between the first magnetic core body and the second magnetic core body, that is, the second magnetic core body is only provided with a winding on a single side close to the first magnetic core body. Therefore, an air gap is provided on the second magnetic core body. In the double-sided magnetic leakage at the air gap of the second magnetic core body, only the magnetic leakage on the side close to the winding will affect the winding, while the magnetic leakage on the side away from the winding is located outside the magnetic core structure. Compared with the related art, an air gap is provided on the middle magnetic column of the magnetic core and there are windings on both sides of the middle magnetic column, so the magnetic leakage on both sides will affect the winding. The magnetic leakage at the air gap on the second magnetic core body has less influence on the winding, which can reduce the heating phenomenon of the winding caused by the influence of magnetic leakage, which is beneficial to improving the service life of the magnetic core structure.

[0023] Moreover, an air gap section including multiple air gaps is provided in the first magnetic core body. Under the same total air gap width requirement, the setting of multiple air gaps can make the width of each air gap in the multiple air gaps smaller than that of a single air gap. The smaller the width of the air gap, the smaller the magnetic leakage generated, thereby reducing the number of magnetic lines passing through the winding, and reducing the influence of magnetic leakage on the winding, which can further reduce the heating phenomenon of the winding caused by the influence of magnetic leakage and improve the service life of the magnetic core structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] FIG1 is a schematic cross-sectional view of a magnetic core structure provided by a first embodiment of the present application;

[0026] FIG2 is a schematic cross-sectional view of a magnetic core structure provided by a second embodiment of the present application;

[0027] FIG3 is a schematic cross-sectional view of a planar transformer corresponding to the magnetic core structure shown in FIG1 ;

[0028] FIG4 is a schematic diagram of a partial magnetic field line distribution during simulation of a planar transformer provided by another embodiment of the present application;

[0029] FIG5 is a schematic cross-sectional view of a planar transformer corresponding to the magnetic core structure shown in FIG2 ;

[0030] FIG6 is a schematic cross-sectional view of a magnetic core structure provided by a third embodiment of the present application;

[0031] FIG7 is a schematic cross-sectional view of a magnetic core structure provided by a fourth embodiment of the present application;

[0032] FIG8 is a schematic cross-sectional view of a magnetic core structure provided by a fifth embodiment of the present application;

[0033] FIG9 is a schematic cross-sectional view of a magnetic core structure provided in a sixth embodiment of the present application;

[0034] FIG10 is a schematic structural diagram of a power adapter provided in an embodiment of the present application.

[0035] Explanation of the accompanying drawings: 1. Magnetic core structure; 10. First magnetic core; 11. First magnetic core body; 12. First magnetic column; 20. Second magnetic core; 21. Second magnetic core body; 211. Air gap section; 2111. Air gap; 212. First surface; 213. Second surface; 22. Fixing part; 221. Fixed core; 23. Second magnetic column; 24. Fixing plate; 30. Installation space; 2. Planar transformer; 201. Circuit board; 202. Winding; 3. Power adapter; 301. Housing. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

[0037] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0038] The transformer satisfies the following condition: L≈(μ*A*N 2 ) / (2*π*r); where L is the inductance; A is the cross-sectional area of ​​the core structure, in cm 2 ; N is the number of turns of the winding; μ is the effective magnetic permeability of the core structure; r is the radian of the core structure from the center dotted line, in cm.

[0039] Excessively high inductance L can lead to saturation, while too low an inductance L can affect efficiency. Therefore, an appropriate inductance L must be designed. When the number of turns N is constant, the effective permeability μ can be adjusted to achieve the desired inductance L. This is typically achieved by adding an air gap to the middle magnetic column of the core structure (e.g., by grinding the middle column to create a gap).

[0040] However, the inventors discovered that in planar transformers, especially high-frequency planar transformers that have been miniaturized to a certain degree, if an air gap is set in the middle magnetic column of the transformer's magnetic core, magnetic flux leakage will occur at the air gap, and the distance between the winding and the air gap is relatively close. The leakage magnetic flux will cut the winding, causing the winding close to the air gap to heat up more and form eddy current loss.

[0041] To overcome the shortcomings of the above solutions, the present application adopts the approach of changing the setting position of the air gap and dividing the air gap into multiple ones. The air gap is directly proportional to the magnetic resistance, and by introducing an air gap, the magnetic resistance can be increased. The magnetic resistance is the inverse of the effective magnetic permeability μ, that is, the greater the magnetic resistance, the smaller the effective magnetic permeability μ, and the two are inversely proportional and are reciprocals of each other. Thus, by introducing an air gap in the transformer, the embodiment of the present application can prevent the transformer from producing magnetic saturation during operation. That is, by introducing an air gap and increasing the magnetic resistance, the effective magnetic permeability is reduced, thereby reducing the inductance.

[0042] Specifically, referring to Figures 1 and 2, the magnetic core structure 1 of the present application includes a first magnetic core 10 and a second magnetic core 20. The first magnetic core 10 is connected to the second magnetic core 20, and a mounting space 30 for accommodating a winding 202 (see Figure 3) is formed between the first magnetic core 10 and the second magnetic core 20. The first magnetic core 10 and the second magnetic core 20 are used to bind magnetic flux lines, so that the magnetic flux lines flow generally within the first magnetic core 10 and the second magnetic core 20.

[0043] 1 , the first magnetic core 10 includes a first magnetic core body 11 and at least three first magnetic pillars 12 . The at least three first magnetic pillars 12 are spaced apart along the extension direction of the first magnetic core body 11 , and each first magnetic pillar 12 is connected to the first magnetic core body 11 . The at least three first magnetic pillars 12 are located on the same side of the first magnetic core body 11 .

[0044] Referring to Figure 1, the second magnetic core 20 includes a second magnetic core body 21. The second magnetic core body 21 is arranged opposite to the first magnetic core body 11 in a direction perpendicular to the extension direction of the first magnetic core body 11. At least three first magnetic columns 12 are located between the first magnetic core body 11 and the second magnetic core body 21, so that an installation space 30 for accommodating the winding 202 is formed between every two adjacent first magnetic columns 12.

[0045] The second core body 21 is provided with at least one air gap section 211 , one air gap section 211 corresponds to one installation space 30 , and the air gap section 211 includes a plurality of air gaps 2111 spaced apart along the extension direction of the second core body 21 , and each air gap 2111 disconnects the second core body 21 .

[0046] 3 to 5 , since the winding 202 is located in the installation space 30 between the first magnetic core body 11 and the second magnetic core body 21 , that is, the second magnetic core body 21 is only provided with the winding 202 on a single side close to the first magnetic core body 11 , the air gap 2111 is provided on the second magnetic core body 21 . In the double-sided magnetic leakage at the air gap 2111 of the second magnetic core body 21 , only the magnetic leakage on the side close to the winding 202 will affect the winding 202 , while the magnetic leakage on the side away from the winding 202 is located outside the magnetic core structure 1 (not shown in the figure). Compared with the related art in which an air gap is provided on the middle magnetic column of the magnetic core and windings are provided on both sides of the middle magnetic column, so that magnetic leakage on both sides will affect the winding, the magnetic leakage at the air gap 2111 on the second magnetic core body 21 has less influence on the winding 202 , thereby reducing the heating phenomenon of the winding 202 caused by the influence of magnetic leakage, which is beneficial to improving the service life of the magnetic core structure 1 .

[0047] Moreover, the above-mentioned air gap section 211 including multiple air gaps 2111 is also set in the second magnetic core body 21. Under the same total air gap width requirement, the setting of multiple air gaps 2111 can make the width of each air gap 2111 in the multiple air gaps 2111 smaller than that of a single air gap. The smaller the width of the air gap 2111, the smaller the magnetic resistance, and the smaller the magnetic leakage generated, thereby reducing the number of magnetic lines passing through the winding 202, and reducing the influence of the magnetic leakage on the winding 202. The heating phenomenon of the winding 202 caused by the influence of the magnetic leakage can be further reduced, and the service life of the magnetic core structure 1 can be improved.

[0048] It should be noted that each of the above-mentioned air gaps 2111 disconnects the second magnetic core body 21 into two parts: the two parts on both sides of each air gap 2111 on the second magnetic core body 21 are separated from each other and are two relatively independent parts, so that the effective magnetic permeability of the magnetic core structure 1 can be changed after the air gap 2111 is set, thereby achieving the required inductance.

[0049] The setting of the air gap 2111 will split the second magnetic core body 21 into several relatively independent parts, and in order to achieve the relatively fixed positions of the relatively independent parts of the second magnetic core body 21, the structure of the second magnetic core body 21 is stable, and the relatively independent parts in the second magnetic core body 21 can be connected as a whole through a fixing member. Among them, the fixing member can be a non-magnetic member, and the magnetic permeability of the non-magnetic member is approximately equal to the magnetic permeability of the air, that is, the setting of the fixing member will not have any other effect on the effective magnetic permeability of the magnetic core structure 1, and will not affect the distribution of magnetic lines of force. In the embodiment of the present application, the fixing member can be made of any non-magnetic material, for example, the fixing member can be a non-ferromagnetic member, and the first magnetic core 10 as a whole, the second magnetic core body 21 of the second magnetic core 20, etc. can be any magnetic core, for example, a manganese-zinc ferrite core, etc., without limitation. The magnetic material selected for the first magnetic core 10 and the second magnetic core 20 can be the same.

[0050] It should be noted that the fixing part may belong to the magnetic core structure 1 or to a device outside the magnetic core structure 1. For example, when the magnetic core structure 1 is used in the transformer 2, the fixing part may belong to the transformer 2, etc. This embodiment of the application does not limit this.

[0051] If the fixing member 22 is part of the magnetic core structure 1, in one exemplary embodiment, referring to Figures 2 and 5 , the fixing member 22 may include a plurality of fixing cores 221, each of which is disposed in each air gap 2111. The fixing cores 221 integrally connect the two parts of the second magnetic core body 21 that were separated by the corresponding air gap 2111. Because the fixing cores 221 are disposed within the air gap 2111, the increase in the size of the magnetic core structure 1 caused by the installation of the fixing member 22 can be reduced or even avoided, thereby meeting the requirements for a miniaturized design of the magnetic core structure 1.

[0052] It is understandable that the fixed core 221 can be completely placed in the corresponding air gap 2111, or the fixed core 221 can be partially placed in the corresponding air gap 2111 and partially placed outside the corresponding air gap 2111, and can be flexibly designed according to actual needs.

[0053] Among them, the fixed core 221 can be an adhesive layer filled in the air gap 2111. After the adhesive layer is cured, the connection of the parts on both sides of the air gap 2111 can be achieved, and the connection method is simpler and easier to operate. Specifically, during assembly, the various parts of the second magnetic core body 21 can be fixed by a jig, and then glue is dispensed into the air gap 2111 between the two adjacent parts. After the glue is cured, the connection of the parts on both sides of the air gap 2111 can be achieved. It is understandable that the fixed core 221 can also be a connecting rod, etc., and the connecting rod can be connected to the parts on both sides of the air gap 2111 by bonding or other methods, and this is not limited.

[0054] The fixed core 221 may fill the air gap 2111 , so that the structures of the parts on both sides of the air gap 2111 are more reliable and the structure of the second magnetic core 20 is more stable.

[0055] In another exemplary solution, referring to FIG. 6 , the fixing member 22 may include a fixing piece 24 . The fixing piece 24 may extend along the extension direction of the second magnetic core body 21 . The fixing piece 24 connects the second magnetic core body 21 disconnected by the air gap 2111 into one body.

[0056] It can be understood that, referring to FIG6 , the second magnetic core body 21 has a first surface 212 facing the first magnetic core body 11, a second surface 213 facing away from the first magnetic core body 11, a third surface (not shown in the figure) and a fourth surface (not shown in the figure) connected between the first surface 212 and the second surface 213 and arranged opposite to each other. The first surface 212, the second surface 213, the third surface and the fourth surface all extend along the extension direction of the second magnetic core body 21. The above-mentioned fixing piece 24 can be located on the side of any one of the first surface 212, the second surface 213, the third surface and the fourth surface of the second magnetic core body 21 and connected to the second magnetic core body 21. It should be noted that if the fixing piece 24 is located on the side of the first surface 212 of the second magnetic core body 21, the fixing piece 24 is arranged away from the first magnetic column 12.

[0057] In another exemplary embodiment, the fixing member 22 may include both the fixing plate 24 and the fixing core 221 to enhance the structural strength of the second magnetic core body 21. In summary, the structure of the fixing member 22 may be varied and may be flexibly designed according to actual needs.

[0058] In combination with the above records, the smaller the width of the air gap 2111, the smaller the magnetic leakage it produces, which in turn reduces the magnetic lines of force passing through the winding 202 and reduces the impact of the magnetic leakage on the winding 202; that is, the smaller the width of the air gap 2111, the better. Under the same total air gap width requirement, the more air gaps 2111 there are, the smaller the width of each air gap 2111 can be. However, the more air gaps 2111 there are, the more complex the molding process of the second magnetic core 20 will be, and the higher the manufacturing cost. Therefore, it is necessary to reasonably design the number of air gaps 2111 so that the magnetic core structure 1 has both the effect of small impact on the magnetic leakage of the winding 202 and low manufacturing cost of the second magnetic core 20. Based on this, in the second magnetic core 20, the air gap segment 211 can include two to five air gaps 2111. For example, the air gap segment 211 can include two, three, four, or five air gaps 2111, which can be flexibly selected according to actual needs. In the embodiment of the present application, the air gap section 211 includes three air gaps 2111 , so that the magnetic core structure 1 has both the effects of small impact on magnetic leakage of the winding 202 and low manufacturing cost of the second magnetic core 20 .

[0059] In the air gap section 211, the width h1 of each air gap 2111 along the extension direction of the second magnetic core body 21 can be approximately equal or unequal. In the air gap section 211, the unequal width h1 of each air gap 2111 along the extension direction of the second magnetic core body 21 can be: the width h1 of some air gaps 2111 along the extension direction of the second magnetic core body 21 is approximately equal, and the width h1 of some air gaps 2111 along the extension direction of the second magnetic core body 21 is unequal; or the width h1 of all air gaps 2111 along the extension direction of the second magnetic core body 21 is different. In the embodiment of the present application, in the air gap section 211, the width h1 of each air gap 2111 along the extension direction of the second magnetic core body 21 is approximately equal, so that the magnetic leakage at each air gap 2111 is approximately similar, which helps to reduce the design difficulty of the transformer 2.

[0060] Within the air gap section 211, the width h1 of each air gap 2111 along the extension direction of the second magnetic core body 21 can be greater than or equal to 0.5 mm and less than or equal to 1 mm. The above-mentioned reasonable limitation of the width h1 of each air gap 2111 along the extension direction of the second magnetic core body 21 can achieve the effect of effectively closing the magnetic lines of force, so that the magnetic lines of force will be largely confined between the air gaps 2111, with minimal leakage. Optionally, within the air gap section 211, the width h1 of each air gap 2111 along the extension direction of the second magnetic core body 21 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc., without limitation.

[0061] The air gap section 211 includes at least one air gap 2111. For example, three air gaps 2111 are provided. The air gaps 2111 can be arranged at approximately equal intervals or at unequal intervals along the extension direction of the second magnetic core body 21. The unequal intervals of the air gaps 2111 along the extension direction of the second magnetic core body 21 can be: some air gaps 2111 are arranged at approximately equal intervals along the extension direction of the second magnetic core body 21, while some air gaps 2111 are arranged at unequal intervals along the extension direction of the second magnetic core body 21. Alternatively, all air gaps 2111 can be arranged at unequal intervals along the extension direction of the second magnetic core body 21.

[0062] The air gaps 2111 are arranged at approximately equal intervals along the extension direction of the second magnetic core body 21, so that the lengths of the portion of the second magnetic core body 21 between each two adjacent air gaps 2111 along the extension direction of the second magnetic core body 21 are approximately equal. In this way, during production, the portion of the second magnetic core body 21 located between two adjacent air gaps 2111 can be manufactured using the same model of tooling, which can reduce manufacturing costs. The air gaps 2111 are arranged at unequal intervals along the extension direction of the second magnetic core body 21, so that the lengths of the portion of the second magnetic core body 21 between two adjacent air gaps 2111 along the extension direction of the second magnetic core body 21 are unequal. This can achieve structural diversification of the second magnetic core 20 to meet more usage requirements.

[0063] It is understandable that at least three first magnetic columns 12 will form at least two installation spaces 30 , and the second magnetic core body 21 can be provided with one air gap section 211 or at least two air gap sections 211 , each air gap section 211 corresponding to an installation space 30 .

[0064] The number of the air gap segments 211 may be less than the number of the installation spaces 30 ; for example, the second magnetic core body 21 is provided with one air gap segment 211 , and the air gap segment 211 corresponds to one of at least two installation spaces 30 .

[0065] The number of the air gap sections 211 can be equal to the number of the installation spaces 30. In this case, each air gap section 211 corresponds to one installation space 30. 。 For example, the first magnetic core 10 includes three first magnetic columns 12, which form two installation spaces 30. The second magnetic core body 21 is provided with two air gap sections 211, and each air gap section 211 corresponds to an installation space 30. By providing two air gap sections 211, the magnetic leakage effect on the portion of the winding 202 located in the two installation spaces 30 can be dispersed, heat generation is more dispersed, and the impact on the service life of the winding 202 is reduced. For another example, the first magnetic core 10 includes four first magnetic columns 12, which form three installation spaces 30. The second magnetic core body 21 is provided with three air gap sections 211, and each air gap section 211 corresponds to an installation space 30.

[0066] In the embodiment of the present application, the number of the first magnetic columns 12 included in the first magnetic core 10 can be any number greater than three. For example, the first magnetic core 10 includes three first magnetic columns 12 , four first magnetic columns 12 , and so on, which is not limited to this.

[0067] In an exemplary embodiment, referring to Figures 1 to 6 , the first magnetic core 10 may include three first magnetic pillars 12, and the second magnetic core body 21 of the second magnetic core 20 may be directly connected to an end of each first magnetic pillar 12 facing away from the first magnetic core body 11. In this case, the first magnetic core 10 may be substantially an E-shaped magnetic core, and the second magnetic core 20 may be substantially an I-shaped magnetic core.

[0068] In this exemplary solution, referring to FIG. 1 to FIG. 6 , the first magnetic core body 11 and the three first magnetic columns 12 of the first magnetic core 10 may be an integrally formed structure to reduce the number of assembly steps.

[0069] 7 , the first magnetic core 10 may include three first magnetic columns 12, and the second magnetic core 20 may include three second magnetic columns 23 in addition to the second magnetic core body 21. In this case, both the first magnetic core 10 and the second magnetic core 20 are generally E-shaped magnetic cores.

[0070] In this exemplary embodiment, referring to FIG7 , the second magnetic core 20 further includes three second magnetic pillars 23 . The three second magnetic pillars 23 are spaced apart along the extension direction of the second magnetic core body 21 , and each second magnetic pillar 23 is connected to the second magnetic core body 21 . The three second magnetic pillars 23 are located on a side of the second magnetic core body 21 close to the first magnetic core body 11 , and each second magnetic pillar 23 corresponds to each first magnetic pillar 12 . Each second magnetic pillar 23 can be connected to a corresponding first magnetic pillar 12 . The second magnetic core body 21 and the three second magnetic pillars 23 can be an integrally formed structure and can be made of a selected magnetic material.

[0071] In this exemplary embodiment, referring to FIG7 , the first core body 11 and three first magnetic columns 12 of the first core 10 can be integrally formed to reduce assembly steps. The second core body 21 and three second magnetic columns 23 of the second core 20 can be integrally formed to reduce assembly steps.

[0072] In another exemplary solution, referring to FIG. 8 , the first magnetic core 10 may include four first magnetic columns 12 , and the second magnetic core body 21 of the second magnetic core 20 may be directly connected to one end of each first magnetic column 12 facing away from the first magnetic core body 11 .

[0073] In this exemplary solution, referring to FIG. 8 , the first magnetic core body 11 and the four first magnetic columns 12 of the first magnetic core 10 may be an integrally formed structure to reduce assembly steps.

[0074] In another exemplary solution, referring to FIG. 9 , the first magnetic core 10 may include four first magnetic columns 12 , and the second magnetic core 20 may include four second magnetic columns 23 in addition to the second magnetic core body 21 .

[0075] In this exemplary embodiment, referring to FIG9 , the second magnetic core 20 further includes four second magnetic pillars 23 . The four second magnetic pillars 23 are spaced apart along the extension direction of the second magnetic core body 21 , and each second magnetic pillar 23 is connected to the second magnetic core body 21 . The four second magnetic pillars 23 are located on a side of the second magnetic core body 21 close to the first magnetic core body 11 , and each second magnetic pillar 23 corresponds to each first magnetic pillar 12 . Each second magnetic pillar 23 can be connected to a corresponding first magnetic pillar 12 . The second magnetic core body 21 and the four second magnetic pillars 23 can be an integrally formed structure and can be made of a selected magnetic material.

[0076] In this exemplary solution, referring to FIG. 9 , the first magnetic core body 11 and the four first magnetic columns 12 of the first magnetic core 10 may be an integrally formed structure to reduce assembly steps.

[0077] In this exemplary solution, referring to FIG. 9 , the second magnetic core body 21 and the four second magnetic columns 23 of the second magnetic core 20 may be an integrally formed structure to reduce the number of assembly steps.

[0078] Compared with the first magnetic core body 11 and the second magnetic core body 21 , the winding 202 can be disposed closer to the first magnetic core body 11 to reduce the magnetic leakage effect at the air gap 2111 on the second magnetic core body 21 .

[0079] Secondly, referring to Figures 3 to 5 , embodiments of the present application provide a planar transformer 2. Planar transformer 2 includes the aforementioned magnetic core structure 1 and a circuit board 201. Circuit board 201 is at least partially located in mounting space 30, and windings 202 are formed on circuit board 201. Forming windings 202 on circuit board 201 facilitates the miniaturization of planar transformer 2. Circuit board 201 can be any planar transformer circuit board known in the art, and the specific structure of circuit board 201 is not described in detail in this embodiment of the present application.

[0080] Thirdly, referring to FIG10 , an embodiment of the present application provides a power adapter 3, which includes the aforementioned planar transformer 2 and a housing 301, with the planar transformer 2 disposed within the housing 301. Compared to power adapters in related art, the power adapter 3 of the present application can only make the aforementioned adjustments to the specific structure of the planar transformer 2, while the installation position and connection relationship of the planar transformer 2 can remain unchanged. The specific structure of the power adapter 3 will not be described in detail herein.

[0081] It should be noted that, since the air gap 2111 in the embodiment of the present application has little effect on the magnetic leakage of the winding 202, the power adapter 3 can be an AC-DC or DC-DC power adapter with higher power density.

[0082] In the description of this application, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, in the description of this application, unless otherwise specified, "multiple" refers to at least two, for example, two, three, four, etc. "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship.

[0083] The above disclosure is only a preferred embodiment of the present application, and certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A magnetic core structure, characterized in that: include: A first magnetic core, wherein the first magnetic core comprises a first magnetic core body and at least three first magnetic columns, wherein the at least three first magnetic columns are arranged at intervals along an extension direction of the first magnetic core body, and each of the first magnetic columns is connected to the first magnetic core body, and the at least three first magnetic columns are located on the same side of the first magnetic core body; A second magnetic core, the second magnetic core is connected to the first magnetic core, the second magnetic core includes a second magnetic core body, the second magnetic core body is arranged opposite to the first magnetic core body in a direction perpendicular to the extension direction of the first magnetic core body, the at least three first magnetic columns are located between the first magnetic core body and the second magnetic core body, so that an installation space for accommodating the winding is formed between each adjacent two first magnetic columns, the second magnetic core body is provided with at least one air gap section, one air gap section corresponds to one installation space, the air gap section includes a plurality of air gaps arranged at intervals along the extension direction of the second magnetic core body, and each of the air gaps disconnects the second magnetic core body.

2. The magnetic core structure according to claim 1, characterized in that: In the air gap section, the width of each air gap along the extension direction of the second magnetic core body is greater than or equal to 0.5 mm and less than or equal to 1 mm.

3. The magnetic core structure according to claim 1, characterized in that: The at least three first magnetic columns form at least two installation spaces, the second magnetic core body is provided with at least two air gap sections, and each air gap section corresponds to one installation space.

4. The magnetic core structure according to any one of claims 1 to 3, characterized in that: The second magnetic core further comprises: A fixing part, wherein the fixing part connects the second magnetic core body disconnected by the air gap into one body, and the fixing part is a non-magnetic part.

5. The magnetic core structure according to claim 4, characterized in that: The fixing member comprises: A plurality of fixed cores are provided in each of the air gaps, and the fixed cores connect two parts of the second magnetic core body separated by the corresponding air gap into one.

6. The magnetic core structure according to claim 4, characterized in that: The fixing member comprises: A fixing plate extends along an extension direction of the second magnetic core body, and the fixing plate connects the second magnetic core bodies disconnected by the air gap into one.

7. The magnetic core structure according to claim 1, characterized in that: The second magnetic core body is connected to an end of each of the first magnetic columns away from the first magnetic core body.

8. The magnetic core structure according to claim 1, characterized in that: The first magnetic core includes three first magnetic columns, and the second magnetic core further includes: Three second magnetic columns, the three second magnetic columns are arranged at intervals along the extension direction of the second magnetic core body, and each of the second magnetic columns is connected to the second magnetic core body, the three second magnetic columns are located on the side of the second magnetic core body close to the first magnetic core body, and each of the second magnetic columns corresponds to each of the first magnetic columns.

9. The magnetic core structure according to claim 1, characterized in that: The first magnetic core includes four first magnetic columns, and the second magnetic core also includes: Four second magnetic columns, the four second magnetic columns are arranged at intervals along the extension direction of the second magnetic core body, and each of the second magnetic columns is connected to the second magnetic core body, the four second magnetic columns are located on the side of the second magnetic core body close to the first magnetic core body, and each of the second magnetic columns corresponds to each of the first magnetic columns.

10. A transformer, characterized in that: It comprises the magnetic core structure and circuit board according to any one of claims 1 to 9, wherein at least a portion of the circuit board is located in the installation space, and the winding is formed on the circuit board.

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