Magnetic core assembly, inductor and power converter

Abstract

The utility model discloses a magnetic core assembly, an inductor and a power converter. According to the scheme, the magnetic core assembly comprises at least two oppositely-arranged magnetic yokes and a magnetic column connected with the magnetic yokes, and each of the magnetic yokes and the magnetic column comprises at least two laminated magnetic conductive pieces; one of the magnetic column and the magnetic yoke is used as a first magnetic core, the other one of the magnetic column and the magnetic yoke is used as a second magnetic core, the first magnetic core is provided with a hole penetrating through at least two magnetic conductive sheets, and the hole is filled with an adsorption combination body so as to be connected with each magnetic conductive sheet. When the inductor is assembled, the synergistic effect of the connection of at least two magnetic conductive sheets in the same magnetic core and the connection between the magnetic core and the adjacent magnetic core does not need to be considered, and additional action adjustment made by considering the synergistic effect is also not needed, so that the assembly time is shortened, and the assembly efficiency of the inductor is improved.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to a magnetic core assembly, an inductor, and a power converter. Background Technology

[0002] Currently, the magnetic core in silicon steel inductors is mainly composed of sheet-like magnetic conductive sheets. These sheets are stacked together to form a silicon steel block of the required thickness. The structural strength between the magnetic conductive sheets is mainly provided by bolts, making the inductor assembly process quite cumbersome.

[0003] Therefore, how to improve the assembly efficiency of inductors has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] This application proposes a magnetic core assembly, an inductor, and a power converter to improve the assembly efficiency of the inductor.

[0005] To achieve the above objectives, this application discloses the following technical solutions:

[0006] In a first aspect, this application provides a magnetic core assembly, including at least two magnetic yokes arranged opposite each other, and magnetic pillars connecting the magnetic yokes. Both the magnetic yokes and the magnetic pillars include at least two magnetically conductive sheets arranged in a stacked manner. One of the magnetic pillars and the magnetic yokes serves as a first magnetic core, and the other of the two serves as a second magnetic core. The first magnetic core is provided with a hole penetrating at least two magnetically conductive sheets, and the hole is filled with an adsorption binder to connect each magnetically conductive sheet.

[0007] In some embodiments, the magnetic conductor sheet is made of silicon steel sheet, and at least two silicon steel sheets of the second magnetic core are stacked and connected by a metallurgical bond, and the metallurgical bond is set away from the connection surface between the first magnetic core and the second magnetic core.

[0008] In some embodiments, the metallurgical bond is located on the side of at least two stacked silicon steel sheets, and the extension direction of the metallurgical bond is perpendicular to the magnetic circuit of the silicon steel sheet of the second magnetic core.

[0009] In some embodiments, the adsorption binder comprises a heat-resistant adhesive filling the pores, the heat-resistant adhesive being connected to each magnetic sheet; or

[0010] The magnetic powder core is filled into the hole and connected to each magnetic sheet through a colloid.

[0011] In some embodiments, the heat-resistant adhesive is a magnetic adhesive.

[0012] In some embodiments, the second magnetic core has a hole penetrating at least two magnetic sheets, the hole being filled with an adsorption binder, the adsorption binder comprising a heat-resistant adhesive filled within the hole, the heat-resistant adhesive being connected to each magnetic sheet; or

[0013] The magnetic powder core is filled into the hole and connected to each magnetic sheet through a colloid.

[0014] In some embodiments, the number of holes is multiple.

[0015] In some embodiments, both the yoke and the magnetic pillar are cuboid structures.

[0016] Secondly, this application provides an inductor including a coil and a magnetic core assembly as described above, wherein the coil is wound around the outer periphery of the magnetic post of the magnetic core assembly.

[0017] Thirdly, this application provides a power converter including the inductor described above.

[0018] As can be seen from the above technical solution, since at least two magnetic sheets in the first magnetic core of the magnetic core assembly are connected by an adsorption assembly and integrated into one unit, when assembling the inductor, there is no need to consider the connection of at least two magnetic sheets in the same magnetic core and the synergistic effect of the connection between the magnetic core and the adjacent magnetic core, nor is there any need for additional action adjustments to take into account the above synergistic effect, thus shortening the assembly time and improving the inductor assembly efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort, and this application can be applied to other similar scenarios based on the provided drawings. Unless obvious from the linguistic context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0020] Figure 1 A top-view perspective view of a magnetic core provided by the prior art;

[0021] Figure 2 A bottom-view perspective view of a magnetic core provided by the prior art;

[0022] Figure 3 A top perspective view of a magnetic core provided in an embodiment of this application;

[0023] Figure 4 for Figure 3 A top view of the magnetic core shown;

[0024] Figure 5 for Figure 4 Sectional view of section AA;

[0025] Figure 6 for Figure 5 Enlarged view of section B;

[0026] Figure 7 A top perspective view of another magnetic core provided in an embodiment of this application;

[0027] Figure 8 for Figure 7 A top view of the magnetic core shown;

[0028] Figure 9 for Figure 8 Sectional view of the C-section;

[0029] Figure 10 for Figure 9 Enlarged view of section D;

[0030] Figure 11 A top perspective view of the third type of magnetic core provided in the embodiments of this application;

[0031] Figure 12 for Figure 11 Enlarged view of section E in the middle;

[0032] Figure 13 A top perspective view of the fourth type of magnetic core provided in the embodiments of this application;

[0033] Figure 14 A bottom perspective view of the fourth type of magnetic core provided in the embodiments of this application;

[0034] Figure 15 A top perspective view of the fifth type of magnetic core provided in the embodiments of this application;

[0035] Figure 16 A perspective view of a magnetic core assembly provided in an embodiment of this application;

[0036] Figure 17 for Figure 16 A top view of the magnetic core assembly shown;

[0037] Figures 18 to 26 A perspective view of the remaining nine magnetic core assemblies provided in the embodiments of this application;

[0038] In the diagram: 10-Magnetic core; 11-Magnetic sheet; 12-Hole; 13-Adsorption bond; 14-Metallurgical bond;

[0039] 10a - Top surface; 10b - Bottom surface; 10c - First side surface; 10e - Second side surface; 10d - Third side surface; 10f - Fourth side surface;

[0040] 131-Heat-resistant adhesive; 132-Magnetic powder core; 133-Colloid;

[0041] 10' - Magnetic yoke; 10” - Magnetic column. Detailed Implementation

[0042] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. The described embodiments are only a part of the embodiments of the present application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without inventive effort are within the scope of protection of the present application.

[0043] As described in the background section, inductor assembly based on magnetic sheets is inefficient. The mainstream technology uses magnetic powder core materials instead of magnetic sheets. Since magnetic powder core materials are integrally pressed, the finished product is a single block, requiring no additional structural components to provide core strength, resulting in a simpler structure. However, using magnetic powder cores leads to a 10% reduction in inductance value for the same volume and winding compared to silicon steel solutions; conversely, a silicon steel solution with the same inductance value is more than 10% cheaper than a magnetic powder core solution.

[0044] Therefore, this application improves the inductor assembly efficiency by taking into account the inductance value. This application describes the structure of the magnetic core in detail with reference to the accompanying drawings:

[0045] See Figure 1 and Figure 2 , Figure 1 and Figure 2 A perspective view of a magnetic core 10 in the related technology is shown. The magnetic core 10 includes at least two magnetically conductive sheets 11, which are stacked together. The stacking direction corresponds to the thickness direction z of the magnetically conductive sheets 11. The stacked magnetically conductive sheets 11 form a specific shape. In the figure, the magnetic core 10 has a cuboid structure. The thickness direction of the magnetically conductive sheets 11 corresponds to the thickness direction z of the magnetic core 10, the length direction x of the magnetically conductive sheets 11 corresponds to the length direction x of the magnetic core 10, and the width direction x of the magnetically conductive sheets 11 corresponds to the width direction y of the magnetic core 10.

[0046] For ease of subsequent description, the magnetic core 10 includes a top surface 10a and a bottom surface 10b arranged opposite to each other, and four side surfaces connecting the top and bottom surfaces (namely, a first side surface 10c, a second side surface 10e, a third side surface 10d, and a fourth side surface 10f, wherein the first side surface 10c and the third side surface 10d are arranged opposite to each other along the length direction, and the second side surface 10e and the fourth side surface 10f are arranged opposite to each other along the width direction; in some examples, the first side surface 10c and the third side surface 10d are arranged opposite to each other along the width direction, and the second side surface 10e and the fourth side surface 10f are arranged opposite to each other along the length direction). The above six surfaces form a cuboid structure.

[0047] To achieve the above objectives, see Figure 3 and Figure 4This application discloses the following technical solutions:

[0048] A magnetic core 10 includes at least two magnetic sheets 11, which are stacked and arranged in the thickness direction of the magnetic sheets 11.

[0049] At least two magnetically conductive sheets 11 are connected by an adsorption bond 13 and / or a metallurgical bond 14, such as Figure 3 and Figure 11 As shown. Since at least two magnetic sheets 11 are connected by a metallurgical bond 14 and / or an adsorption bond 13 and are connected as a whole, when assembling the inductor, there is no need to consider the connection of at least two magnetic sheets 11 in the same magnetic core 10 and the synergistic effect of the connection between the magnetic core 10 and the adjacent magnetic core 10, nor is there any need for additional action adjustments to take into account the above synergistic effect, thus shortening the assembly time and improving the inductor assembly efficiency.

[0050] It should be noted that the magnetic sheet 11 can be a silicon steel sheet, or a sheet structure made of amorphous or nanocrystalline soft magnetic materials, etc.

[0051] The connection of the above-mentioned at least two magnetic conductive sheets 11 can include three schemes: connection by adsorption bond 13, connection by metallurgical bond 14, and connection by using both adsorption bond 13 and metallurgical bond 14.

[0052] See Figure 4 and Figure 5 At least two magnetic sheets 11 are connected by an adsorption assembly 13. The magnetic sheets are connected using an adsorption material, such as an adhesive. Specifically, at least two magnetic sheets 11 of the magnetic core are provided with holes 12. The adsorption assembly 13 includes a heat-resistant adhesive 131 filled in the holes 12, and the heat-resistant adhesive 131 is connected to each magnetic sheet 11. Specifically, the holes 12 penetrating the magnetic sheets 11 can be achieved by drilling 12, or they can be directly molded during the formation of the magnetic sheets 11. After at least two magnetic sheets 11 are stacked, the holes 12 corresponding to each magnetic sheet 11 are aligned. After the heat-resistant adhesive is filled into the hole 12 of a magnetic sheet 11, its peripheral surface contacts and bonds to the hole wall of the hole 12 of the magnetic sheet 11. This process is repeated, and the heat-resistant adhesive connects the hole walls of all magnetic sheets 11, thereby achieving the connection of all magnetic sheets 11 in the entire magnetic core 10.

[0053] The aforementioned heat-resistant adhesive 131 has adhesive properties and good temperature resistance (for example, a heat-resistant adhesive with a temperature resistance exceeding 400 degrees Celsius can be selected). In addition, to increase magnetic flux, the aforementioned heat-resistant adhesive 131 can also be a magnetically conductive adhesive, such as a heat-resistant adhesive 131 mixed with magnetic materials.

[0054] In some examples, the adsorption complex 13 includes a magnetic powder core 132 filled within the pores 12, the magnetic powder core 132 being connected to each magnetic sheet 11 via a colloid 133, such as... Figure 7 As shown. Specifically, at least two magnetic sheets 11 of the magnetic core are provided with holes 12, and a colloid 133 is arranged on the outer periphery of the magnetic powder core 132. The magnetic powder core 132 can be connected to each magnetic sheet 11 through the colloid 133. The colloid 133 can be coated on the outer periphery of the magnetic powder core 132 before it is installed in the hole 12, or the colloid 133 can be filled into the hole 12 before the magnetic powder core 132 is installed in the hole 12, or the outer periphery of the magnetic powder core 132 and the hole 12 can both be filled with colloid 133 before the magnetic powder core 132 is installed in the hole 12.

[0055] See Figure 11 and Figure 12 At least two magnetic sheets 11 of the magnetic core are connected by a metallurgical bond 14, and the magnetic sheets 11 are silicon steel sheets.

[0056] The metallurgical bond 14 can be understood as a bond formed by a metallurgical joining process. Metallurgical joining refers to the process of forming a permanent bond by bonding atoms between the materials (usually metallic materials) through heating, pressurization, or friction. Examples include welding, brazing, argon arc welding, and laser welding. The aforementioned metallurgical bond 14 can be a welded bond, a brazed bond, an argon arc welded bond, or a laser welded bond; laser welding has better adaptability to the material of the magnetic conductor 11. Whether the magnetic conductor 11 is non-removing or removing, good welding results can be achieved by adjusting the laser welding parameters (such as laser power, welding speed, spot size, etc.). Moreover, laser welding can also be used for welding magnetic conductors 11 of different thicknesses, flexibly addressing various material combinations and product design requirements.

[0057] Laser welding is well-suited to various shapes and structures of the magnetic conductor 11. It can weld planar magnetic conductors 11 as well as those with a certain curvature or complex shapes. For example, in the manufacture of inductors with special shapes, laser welding can perform precise welding according to specific shape requirements, ensuring product quality and performance.

[0058] The metallurgical bond 14 serves to connect adjacent magnetic sheets 11. The extension direction of the metallurgical bond 14 can be perpendicular to the thickness direction of the magnetic sheet 11 or parallel to the thickness direction. In some examples, at least two magnetic sheets 11 are stacked and connected by the metallurgical bond 14. The extension direction of the metallurgical bond 14 is perpendicular to the magnetic circuit of the magnetic sheet 11. This can effectively reduce loop formation, prevent eddy current loss, and reduce the temperature rise of the magnetic sheet 11 due to increased eddy current loss.

[0059] The metallurgical assembly 14 is located on the side formed by stacking at least two magnetic sheets 11. For example, when the magnetic core 10 is cuboid in shape, the metallurgical assembly 14 is located on any one or at least two of the four sides of the magnetic core 10. One or at least two metallurgical assemblies 14 may be provided on the side where the metallurgical assembly 14 is provided.

[0060] See Figure 13 and Figure 14 , Figure 13 and 14 The structure of a magnetic core 10 with a metallurgical bonding body 14 is shown. The first side 10c, the third side 10d and the fourth side 10f of the magnetic core 10 are respectively provided with the metallurgical bonding body 14, while the second side 10e is not provided with the metallurgical bonding body 14 as a connecting surface for assembly.

[0061] See Figure 15 , Figure 15 Another magnetic core structure with metallurgical bonding 14 is shown. The first side 10c and the third side 10d of the magnetic core 10 are respectively provided with metallurgical bonding 14 as connecting surfaces for assembly, while the second side 10e and the fourth side 10f are not provided with metallurgical bonding 14.

[0062] See Figure 16 This application provides a magnetic core assembly, including at least two opposingly arranged magnetic yokes 10' and a magnetic pillar 10" connecting the magnetic yokes 10'. The magnetic yokes 10' and the magnetic pillars 10" are one type of magnetic core described above, each including at least two stacked magnetic conductive sheets 11. For ease of description, one of the magnetic yokes 10' and the magnetic pillars 10" is used as a first magnetic core, and the other is used as a second magnetic core. The first magnetic core is provided with a hole 12 penetrating at least two magnetic conductive sheets 11, and the hole 12 is filled with an adsorption connector 13 to connect each magnetic conductive sheet 11. Since the magnetic core 10 has the above-mentioned beneficial effects, the inductance of the magnetic core 10 also has corresponding effects, which will not be described in detail here.

[0063] It should be noted here that, when one of the magnetic yoke 10' and the magnetic pillar 10" is used as the first magnetic core, and the other is used as the second magnetic core, it can be understood that when the magnetic pillar 10" is the first magnetic core, the magnetic yoke 10' is the second magnetic core; and when the magnetic pillar 10" is the second magnetic core, the magnetic yoke 10' is the first magnetic core. The first and second magnetic cores themselves are not limiting in meaning, but are concepts introduced only for the convenience of description. In the following examples of this application, the magnetic pillar 10" is used as the first magnetic core and the magnetic yoke 10' is used as the second magnetic core. For the case where the magnetic pillar 10" is the second magnetic core and the magnetic yoke 10' is the first magnetic core, please refer to this description.

[0064] like Figure 16As shown in the diagram, the magnetic core assembly includes two yokes 10' and three magnetic pillars 10'". The two yokes 10' are arranged opposite each other, and the three magnetic pillars 10' are evenly distributed between the two yokes 10'. The magnetic circuit formed by this inductor is as follows: Figure 17 As shown.

[0065] In this example, the magnetic column 10” is arranged with heat-resistant adhesive 131 as the first magnetic core, and the magnetic yoke 10' is arranged with metallurgical bonding body 14 as the second magnetic core. The first side 10c, the third side 10d and the fourth side 10f of the magnetic yoke 10' are respectively provided with metallurgical bonding body 14, while the second side 10e is not provided with metallurgical bonding body 14 as a connecting surface for assembly with the magnetic column 10”.

[0066] See Figure 17 In this magnetic core assembly, the extension direction of the metallurgical bond 14 is perpendicular to the magnetic circuit of the magnetic sheet 11. The extension direction of the metallurgical bond 14 is perpendicular to the magnetic circuit (direction shown by the dotted line) of the magnetic sheet 11, which can effectively reduce the formation of loops, prevent eddy current loss, and reduce the temperature rise of the magnetic sheet 11 due to the increase of eddy current loss.

[0067] like Figure 18 As shown in the figure, the magnetic core assembly includes two magnetic yokes 10' and three magnetic pillars 10'". The two magnetic yokes 10' are arranged opposite each other, and the three magnetic pillars 10' are evenly distributed between the two magnetic yokes 10'. At least two magnetic conductive sheets 11 of the two magnetic yokes 10' and the three magnetic pillars 10' are connected by heat-resistant adhesive 131.

[0068] See Figure 19 The magnetic core assembly shown in the figure includes two magnetic yokes 10' and three magnetic pillars 10'". The two magnetic yokes 10' are arranged opposite each other, and the three magnetic pillars 10' are evenly distributed between the two magnetic yokes 10'. At least two magnetic conductive sheets 11 of the three magnetic pillars 10' are connected by heat-resistant adhesive 131, and at least two magnetic conductive sheets 11 of the two magnetic yokes 10' are connected by magnetic powder cores 132.

[0069] like Figure 20 As shown in the diagram, the magnetic core assembly includes two yokes 10' and three magnetic pillars 10'". The two yokes 10' are arranged opposite each other, and the three magnetic pillars 10' are evenly distributed between the two yokes 10'. In this example, the magnetic pillars 10' serve as the first magnetic core and are provided with magnetic powder cores 132, while the yokes 10' serve as the second magnetic core and are provided with metallurgical bonding bodies 14. The first side 10c, the third side 10d, and the fourth side 10f of the yokes 10' are each provided with metallurgical bonding bodies 14, while the second side 10e does not have a metallurgical bonding body 14 as a connecting surface for assembly with the magnetic pillars 10'.

[0070] See Figure 21The magnetic core assembly shown in the figure includes two magnetic yokes 10' and three magnetic pillars 10'". The two magnetic yokes 10' are arranged opposite each other, and the three magnetic pillars 10' are evenly distributed between the two magnetic yokes 10'. At least two magnetic conductive sheets 11 of the three magnetic pillars 10' are connected by magnetic powder cores 132, and at least two magnetic conductive sheets 11 of the two magnetic yokes 10' are connected by heat-resistant adhesive 131.

[0071] See Figure 22 The magnetic core assembly shown in the figure includes two magnetic yokes 10' and three magnetic pillars 10'". The two magnetic yokes 10' are arranged opposite each other, and the three magnetic pillars 10' are evenly distributed between the two magnetic yokes 10'. The three magnetic pillars 10' and at least two magnetic conductive sheets 11 of the two magnetic yokes 10' are all connected by magnetic powder cores 132.

[0072] See Figure 23 The magnetic core assembly shown in the diagram is... Figure 18 Based on the magnetic core assembly shown, at least two magnetic sheets 11 of its yoke 10' are also connected by a metallurgical assembly 14.

[0073] See Figure 24 The magnetic core assembly shown in the diagram is... Figure 19 Based on the magnetic core assembly shown, at least two magnetic sheets 11 of its yoke 10' are also connected by a metallurgical assembly 14.

[0074] See Figure 25 The magnetic core assembly shown in the diagram is... Figure 21 Based on the magnetic core assembly shown, at least two magnetic sheets 11 of its yoke 10' are also connected by a metallurgical assembly 14.

[0075] See Figure 26 The magnetic core assembly shown in the diagram is... Figure 22 Based on the magnetic core assembly shown, at least two magnetic sheets 11 of its yoke 10' are also connected by a metallurgical assembly 14.

[0076] The aforementioned magnetic yoke 10' and magnetic column 10” are cuboid structures, but they can be adjusted according to the actual shape of the inductor, such as a cylindrical structure.

[0077] This application provides a power converter including an inductor as described above.

[0078] The aforementioned power converters can be inverters, converters, frequency converters, and grid simulators, etc.

[0079] In the above context, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0080] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. "And / or" in this article is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone.

[0081] It should be noted that, for ease of description, only the parts relevant to the application are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0082] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed, and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. The scope of this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described application concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A magnetic core assembly, characterized by, The magnetic core assembly comprises at least two oppositely arranged magnetic yokes and a magnetic column connecting the magnetic yokes, the magnetic yokes and the magnetic column each comprising at least two pieces of laminated magnetic conductive sheets; one of the magnetic column and the magnetic yokes is a first magnetic core, and the other is a second magnetic core, wherein the first magnetic core is provided with a hole penetrating through the at least two pieces of the magnetic conductive sheets, and the hole is filled with an adsorptive bonding body to connect each piece of the magnetic conductive sheet.

2. The magnetic core assembly of claim 1, wherein, The magnetic conductive sheet is a silicon steel sheet, and at least two pieces of the silicon steel sheets of the second magnetic core are connected through a metallurgical bonding body after being laminated, and the metallurgical bonding body is arranged away from the connecting surface of the first magnetic core and the second magnetic core.

3. The magnetic core assembly of claim 2, wherein, The metallurgical bonding body is located at the side of the stack of the at least two pieces of the silicon steel sheets, and the extension direction of the metallurgical bonding body is perpendicular to the magnetic circuit of the silicon steel sheet of the second magnetic core.

4. The magnetic core assembly of claim 1, wherein, The adsorptive bonding body comprises temperature-resistant glue filled in the hole, and the temperature-resistant glue is connected with each piece of the magnetic conductive sheet; or A magnetic powder core filled in the hole, and the magnetic powder core is connected with each piece of the magnetic conductive sheet through a colloid.

5. The magnetic core assembly of claim 4, wherein, The temperature-resistant glue is a magnetic conductive glue.

6. The magnetic core assembly of any one of claims 1 to 5, wherein, The second magnetic core is provided with a hole penetrating through the at least two pieces of the magnetic conductive sheets, and the hole is filled with an adsorptive bonding body, which comprises temperature-resistant glue filled in the hole, and the temperature-resistant glue is connected with each piece of the magnetic conductive sheet; or A magnetic powder core filled in the hole, and the magnetic powder core is connected with each piece of the magnetic conductive sheet through a colloid.

7. The magnetic core assembly of claim 6, wherein, The number of the holes is multiple.

8. The magnetic core assembly of any one of claims 1 to 5, wherein, The magnetic yoke and the magnetic column are both cuboid structures.

9. An inductor, characterized by The magnetic core assembly comprises a coil and the magnetic core assembly according to any one of claims 1 to 8, and the coil is wound around the outer periphery of the magnetic column of the magnetic core assembly.

10. A power converter, characterized by, The inductor comprises the inductor according to claim 9.

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