CN114783737A - Magnetic element, manufacturing method thereof and electronic equipment - Google Patents

Magnetic element, manufacturing method thereof and electronic equipment Download PDF

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Publication number
CN114783737A
CN114783737A CN202210481542.XA CN202210481542A CN114783737A CN 114783737 A CN114783737 A CN 114783737A CN 202210481542 A CN202210481542 A CN 202210481542A CN 114783737 A CN114783737 A CN 114783737A
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Prior art keywords
coil
magnetic core
central
magnetic
column
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Inventor
宋超
杨占军
徐国英
郑堃
刘松
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CETC 24 Research Institute
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CETC 24 Research Institute
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2804—Printed windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/263—Fastening parts of the core together
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/041—Printed circuit coils

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

The invention is suitable for the technical field of magnetic elements, and provides a magnetic element, a manufacturing method thereof and electronic equipment, wherein the magnetic element comprises: the magnetic core structure comprises a magnetic core bottom plate, a central column and side columns which are integrally formed, the central column is arranged at the central position of the magnetic core bottom plate, and the two side columns are respectively and oppositely arranged at the edge positions of the magnetic core bottom plate; the planar coil structure comprises a coil substrate and a coil, wherein a central hole matched with the central column is preset in the central position of the coil substrate, and the coil is arranged on the coil substrate in a surrounding manner around the central hole; the planar coil structure can be freely sleeved on the magnetic core structure through the matching design between the central hole and the central column, and the problems of low preparation efficiency and the like of the planar magnetic piece in the prior art are solved.

Description

Magnetic element, manufacturing method thereof and electronic equipment
Technical Field
The invention relates to the technical field of magnetic elements, in particular to a magnetic element, a manufacturing method thereof and electronic equipment.
Background
With the rapid development of electronic technology, various electronic devices and systems are widely used in the fields of automobiles, communications, home appliances, industry, national defense, and the like. On one hand, along with the increasing power of electric equipment, such as the increasing cruising ability of new energy automobiles, portable intelligent terminals and other products, the battery capacity is also increased, and the high efficiency is quickly charged to become a key technology in the application field, so that the reduction of the loss of a transformer and an inductor in the power conversion process is crucial to the improvement of the conversion efficiency; on the other hand, the size of the product is continuously reduced, the weight is continuously reduced, the sizes of the transformer and the inductor need to be further reduced based on miniaturization requirements, and the traditional winding coil has the defects of large size, low window utilization rate, poor consistency, large parasitic parameters and the like.
In order to meet the demands for higher frequency and smaller size of power electronic products, planar transformers and inductors (collectively referred to as planar magnetic elements) have recently been favored with advantages of high integration, small parasitic parameters, high conversion efficiency, and the like. The working principle of the plane type magnetic piece is completely the same as that of a common winding magnetic piece, a coil is arranged on the substrate, and the characteristics of high processing precision of the substrate, small interlayer spacing, high window utilization rate and the like are fully utilized, so that the height of the magnetic piece can be well controlled. However, most of the magnetic core structure and the coil structure of the planar magnetic member are manufactured integrally, which results in low manufacturing efficiency of the planar magnetic member.
Disclosure of Invention
The invention provides a magnetic element and a manufacturing method thereof, which aim to solve the problems of low preparation efficiency and the like of a planar magnetic piece in the prior art.
To achieve the above and other related objects, the present invention provides a magnetic element, comprising:
the magnetic core structure comprises a magnetic core bottom plate, a central column and side columns which are integrally formed, wherein the central column is arranged at the central position of the magnetic core bottom plate, and the two side columns are respectively and oppositely arranged at the edge positions of the magnetic core bottom plate;
the planar coil structure comprises a coil substrate and a coil, wherein a central hole matched with the central column is preset in the central position of the coil substrate, and the coil is arranged on the coil substrate in a surrounding manner around the central hole;
the planar coil structure can be freely sleeved on the magnetic core structure through the matching design between the central hole and the central column.
Optionally, the impedance variance of all the coils is smaller than a preset variance threshold, and the coils are connected in series in sequence, wherein the number of turns of the coil is greater than 1.
Optionally, the impedance of the coil is equal for each turn.
Optionally, the shape of the central column comprises a circle.
Optionally, a winding area is disposed on the coil substrate, and the coil is disposed on the winding area;
the shape of the coil comprises a circular ring.
Optionally, the coil is obtained by etching a conductive medium layer, and a dividing line is formed between two adjacent turns of the coil.
Optionally, the radius of the dividing line i is:
Figure BDA0003627664260000021
the center column is a circular center column, the winding area is a circular ring winding area, Ra is the radius of the circular center column, Rb is the radius of an outer circular ring of the circular ring winding area, n is the total number of turns of a coil, n is an integer larger than or equal to 2, the value of the direction i away from the center column is larger, i is larger than or equal to 1 and smaller than or equal to n-1, the thickness of the conductive medium layer is equal, the dividing line i is the dividing line of the ith turn of the coil and the (i + 1) th turn, the dividing line i is circular, the circle center of the dividing line i is coincident with the circle center of the center column, and the coil is a circular coil.
To achieve the above and other related objects, the present invention further provides a method for manufacturing a magnetic element, comprising:
forming a magnetic core structure, wherein the magnetic core structure comprises a magnetic core bottom plate, a central column and side columns which are integrally formed, the central column is arranged at the central position of the magnetic core bottom plate, and the two side columns are respectively and oppositely arranged at the edge positions of the magnetic core bottom plate;
forming a planar coil structure, wherein the planar coil structure comprises a coil substrate and a coil, and the coil is arranged on the coil substrate around the central hole;
and the planar coil structure is sleeved on the magnetic core structure through the matching design between the central hole and the central column.
Optionally, providing the coil substrate;
forming a conductive medium layer on the coil substrate;
and etching the conductive medium layer to form the multi-turn coil.
To achieve the above and other related objects, the present invention also provides an electronic device including the above magnetic element.
The invention has the beneficial effects that: the magnetic element comprises a magnetic core structure and a planar coil structure, wherein the magnetic core structure comprises a magnetic core bottom plate, a central column and side columns which are integrally formed; the planar coil structure comprises a coil substrate and a coil, wherein a central hole matched with the central column is preset in the central position of the coil substrate; through the matching design between the central hole and the central column, the planar coil structure can be freely sleeved on the magnetic core structure; therefore, the preparation processes of the magnetic core structure and the coil structure can be carried out simultaneously, and the problems of low preparation efficiency and the like of the planar magnetic piece in the prior art are solved.
Drawings
FIG. 1 is a schematic diagram of a magnetic core structure according to the present invention;
fig. 2-4 are schematic structural views of the magnetic element of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the features in the following embodiments and examples may be combined with each other without conflict.
Please refer to fig. 1 to 4. It should be noted that the drawings provided in this embodiment are only for schematically illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings and not drawn according to the number, shape and size of the components in actual implementation, and the form, quantity and proportion of each component in actual implementation may be arbitrarily changed, and the component layout may be more complicated. The structures, proportions, and dimensions shown in the drawings and attached to the present specification are only for the purpose of understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is in no way technically essential, and any modifications of the structures, changes of the proportions and adjustments of the dimensions should be within the scope of the present disclosure without affecting the efficacy and attainment of the same.
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The following detailed description of the preferred embodiments of the invention, however, the invention can be practiced otherwise than as specifically described.
The invention provides a magnetic element which comprises a magnetic core structure and a planar coil structure, wherein the magnetic core structure comprises a magnetic core bottom plate, a central column and side columns which are integrally formed, the central column is arranged at the central position of the magnetic core bottom plate, and the two side columns are respectively and oppositely arranged at the edge positions of the magnetic core bottom plate; the planar coil structure comprises a coil substrate and a coil, wherein a central hole matched with the central column is preset in the central position of the coil substrate, and the coil is arranged on the coil substrate in a surrounding manner around the central hole; the planar coil structure can be freely sleeved on the magnetic core structure through the matching design between the central hole and the central column.
Referring to fig. 1, in a three-dimensional rectangular coordinate system (x, y, z directions), the magnetic core structure includes a magnetic core bottom plate, a central pillar, and two side pillars, wherein the central pillar is disposed at a central position of the magnetic core bottom plate, and the two side pillars are disposed at edge positions of the magnetic core bottom plate. When the planar coil structure is sleeved on the magnetic core structure, a mode of contacting the coil substrate with the magnetic core bottom plate can be adopted, and a mode of contacting the coil with the magnetic core bottom plate can also be adopted.
In an embodiment, the material of the coil substrate may be determined according to actual requirements, and the material of the coil substrate includes but is not limited to Printed Circuit Board (PCB), aluminum oxide (AL)2O3) And beryllium oxide (BeO). The coils are obtained by etching the conductive medium layer, and a dividing line is formed between two adjacent turns of coils. The coil substrate is provided with a winding area, and the coil is arranged on the winding area. The shape of the coil includes a circle. The material of the conductive medium can be determined according to actual requirements, and the material of the conductive medium includes but is not limited to copper.
The planar magnetic element is limited by the thickness and the number of layers of the substrate, in order to wind enough turns, a multi-turn coil needs to be wound on the same layer, n turns of windings are realized on the same layer, the windings are connected in series, and the upper layer and the lower layer are connected through interlayer through holes, so that the multi-turn windings are generated on the limited number of layers of the substrate. When the shapes of the magnetic core and the winding window are determined, the winding method for realizing the n-turn coil in the same layer is not limited when the coil is wound. If the coil wire is not properly designed, the impedance is large, and the conversion efficiency of the planar magnetic element is seriously affected. In order to improve the conversion efficiency of the magnetic element, in this embodiment, the impedance variance of all the coils is smaller than a preset variance threshold, and the coils are sequentially connected in series, where the number of turns of the coil is greater than 1, the preset variance threshold may be set according to the required conversion efficiency of the magnetic element, and the preset variance threshold is greater than or equal to 0. When the preset variance threshold is equal to 0, the impedance of each turn of the coil is equal. The sum of the series impedance of all windings on the same layer is smaller than that of other division schemes, so that the winding loss can be reduced, the conversion efficiency of the magnetic element is improved, and the magnetic element has better economic benefit. The magnetic element in this embodiment is one layer of the planar magnetic member.
In one embodiment, the shape of the central column comprises a circle, the shape of the winding area comprises a circular ring, the shape of the coil comprises a circular ring, the equivalent impedance of the circular ring coil is smaller than that of other shapes under the condition of the same magnetic flux density, magnetic field intensity, line width and copper (conductive medium) thickness, the circular ring coil has good symmetry, and the uniform distribution of an electric field and a magnetic field can be ensured. The coil in the magnetic element is in a circular shape, so that the aims of reducing winding loss and improving the conversion efficiency of the magnetic element are fulfilled.
Referring to fig. 2-4, the cross section of the center post is circular, the radius is Ra, the winding area is circular and coincides with the center of the center post of the magnetic core, the outer diameter of the ring is Rb, and the inner diameter of the ring is the same as the radius of the center post of the magnetic core structure. The coil structure mainly conducts current through the conductive medium, the width of the conductive medium is usually far larger than the distance between (coil) windings, and the distance between the windings can be ignored in order to simplify analysis. Wherein, A1, A2, A3, B1, B2 and B3 are two ends of each turn of coil respectively. The division lines between the coils are circular, all the annular coils on the same layer can have the same conduction impedance by setting the radius of the division lines, and the circular division scheme with the same impedance is better than other division schemes with any shapes theoretically because the circular division line has the minimum area-to-perimeter ratio.
In one embodiment, the radius of the dividing line i is:
Figure BDA0003627664260000041
the coil is a circular coil, the center column is a dividing line, the center column is a circular center column, the winding area is a circular winding area, Ra is the radius of the circular center column, Rb is the radius of an outer ring of the circular winding area, n is the total number of turns of the coil, n is an integer greater than or equal to 2, the value of the direction i away from the center column is larger, i is greater than or equal to 1 and less than or equal to n-1, the thickness of the conductive medium layer is equal, the dividing line i is the dividing line of the ith turn of the coil and the (i + 1) th turn, the shape of the dividing line i is circular, the circle center of the dividing line i is superposed with the circle center of the center column, and the coil is a circular coil.
When the annular winding area is 1 turn, the impedance between one end A1 of the coil and the other end B1 of the coil is Z, and the impedance formula can be obtained according to the annular conductor impedance formula
Figure BDA0003627664260000051
Where h is the thickness of the conductive medium of the winding, h is a constant value on the same layer on the board, and ρ is the resistivity of the conductive medium.
When the annular winding area is divided into n turns of coils (n is more than or equal to 2, and n is an integer), the impedances of the coils are respectively Z1 and Z2 … Zn, and if the n turns of coils are connected in parallel, the impedance is equal to the impedance Z of a single turn of coil in the winding area.
Figure BDA0003627664260000052
Wherein
Figure BDA0003627664260000053
The impedance formed for the series connection of n windings is given by the mean inequality, and an equality holds if and only if Z1-Z2- … -Zn.
According to the analysis, when the annular winding area is divided into a plurality of turns of coils, a division rule needs to be found so that the impedance of each turn of coil is completely the same.
In the coil segmentation method provided by the invention, the winding area is segmented into n parts (n is more than or equal to 2, and n is an integer), and in order to ensure that all the coil impedances generated by the segmentation method are the same, only the impedance of any 1 turn needs to be proved to be n times of the single-turn impedance of the winding area.
All coils generated by the coil segmentation method provided by the invention are annular coils, and the i-th turn of coil impedance can be obtained according to an annular conductor impedance formula
Figure BDA0003627664260000054
By comparing the above formulae, Zi can be obtained as n × Z.
The analysis shows that the coil winding method based on the magnetic element can enable the series impedance of a multi-turn coil to reach the theoretical minimum value, effectively reduce the coil loss and improve the conversion efficiency of the planar magnetic piece.
Referring to fig. 2, when the magnetic element (a layer of substrate) only needs to be wound with 1 turn of coil, the ring winding area does not need to be divided.
Referring to fig. 3, when a magnetic element (a layer of substrate) needs to be wound with 2 turns of coil, the annular winding area needs to be divided into 2 parts, the division line names of the 1 st turn and the 2 nd turn are denoted as division line 1, the division line 1 is circular and coincides with the center of the center post of the magnetic core, and the radius of the division line 1 is equal to the center of the center post of the magnetic core
Figure BDA0003627664260000055
Referring to fig. 4, when 3 turns of coil are required to be wound on a magnetic element (a layer of substrate), the annular winding area needs to be divided into 3 parts, the division line names of the 1 st turn and the 2 nd turn are marked as division line 1, the division line 1 is circular and coincides with the center of the magnetic core center post, and the radius of the division line 1 is equal to the radius of the magnetic core center post
Figure BDA0003627664260000061
The names of the division lines of the 2 nd turn and the 3 rd turn are marked as division lines 2, the division lines 2 are circular and coincide with the center of the magnetic core center post,radius of the parting line 2
Figure BDA0003627664260000062
When a layer of substrate needs to be wound with n turns of coils (n is more than or equal to 2 and n is an integer), the annular winding area needs to be divided into n parts, the dividing mode is that the name of the dividing line of the ith turn and the (i + 1) th turn is recorded as a dividing line i, wherein (i is more than or equal to 1 and less than or equal to n-1), the shape of the dividing line i is circular and is superposed with the center of the magnetic core central column, and the radius of the dividing line i is coincident with the center of the magnetic core central column
Figure BDA0003627664260000063
The invention also provides electronic equipment which comprises the magnetic element. Electronic devices include, but are not limited to, transformers, inductors.
Based on the same inventive concept as the above magnetic element, correspondingly, the present embodiment further provides a manufacturing method of the magnetic element. In this embodiment, the method is implemented on the magnetic element described in any of the above embodiments, and specific functions and technical effects may be implemented with reference to the above embodiments, which are not described herein again.
In one embodiment, a method of fabricating a magnetic element includes: forming a magnetic core structure, wherein the magnetic core structure comprises a magnetic core bottom plate, a central column and side columns which are integrally formed, the central column is arranged at the central position of the magnetic core bottom plate, and the two side columns are respectively and oppositely arranged at the edge positions of the magnetic core bottom plate; forming a planar coil structure, wherein the planar coil structure comprises a coil substrate and a coil, and the coil is arranged on the coil substrate around a central hole; the planar coil structure is sleeved on the magnetic core structure through the matching design between the central hole and the central column.
In one embodiment, the step of forming a planar coil structure comprises: providing a coil substrate; forming a conductive medium layer on the coil substrate; and etching the conductive medium layer to form the multi-turn coil.
In one embodiment, the impedance variance of all the coils is smaller than a preset variance threshold, and the coils of each turn are connected in series in sequence, wherein the number of turns of the coil is larger than 1. The preset variance threshold is greater than or equal to 0.
In one embodiment, the conductive medium layer is etched, a dividing line is formed in a coil substrate region corresponding to an etched part of the conductive medium, a winding region is formed in a coil substrate region corresponding to the conductive medium layer before etching, and the radius of the dividing line i is as follows:
Figure BDA0003627664260000064
the coil is a circular coil, the center column is a dividing line, the center column is a circular center column, the winding area is a circular winding area, Ra is the radius of the circular center column, Rb is the radius of an outer ring of the circular winding area, n is the total number of turns of the coil, n is an integer greater than or equal to 2, the value of the direction i away from the center column is larger, i is greater than or equal to 1 and less than or equal to n-1, the thickness of the conductive medium layer is equal, the dividing line i is the dividing line of the ith turn of the coil and the (i + 1) th turn, the shape of the dividing line i is circular, the circle center of the dividing line i is superposed with the circle center of the center column, and the coil is a circular coil. The division lines between the coils are circular, all the annular coils on the same layer can have the same conduction impedance by setting the radius of the division lines, and the circular division scheme with the same impedance is better than other division schemes with any shapes theoretically because the circular division line has the minimum area-to-perimeter ratio. In the manufacturing method of the magnetic element in the embodiment, the shape of each structure in the magnetic element and the radius of the dividing line are reasonably set, so that the radius of each turn of coil is reasonably set, and the purposes of reducing coil loss and improving the conversion efficiency of the magnetic element are achieved.
In summary, in the magnetic element of the present invention, the central hole matched with the central column of the magnetic core structure is preset at the central position of the coil substrate, and the planar coil structure can be freely sleeved on the magnetic core structure through the matching design between the central hole and the central column; therefore, the preparation processes of the magnetic core structure and the coil structure can be carried out simultaneously, and the problems of low preparation efficiency and the like of the planar magnetic piece in the prior art are solved. The purpose of improving the energy conversion efficiency of the magnetic element is achieved by setting the impedance variance of all coils in the magnetic element to be smaller than the preset impedance variance. Therefore, the invention designs a coil segmentation method based on the principle of minimum impedance, effectively fills the blank of the field of the optimal coil segmentation method in the prior planar magnetic device technology, and the magnetic element and the equipment manufactured based on the method have higher energy conversion efficiency than the traditional method on the basis of not increasing the cost, thereby having high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (10)

1. A magnetic element, comprising:
the magnetic core structure comprises a magnetic core bottom plate, a central column and side columns which are integrally formed, wherein the central column is arranged at the central position of the magnetic core bottom plate, and the two side columns are respectively and oppositely arranged at the edge positions of the magnetic core bottom plate;
the planar coil structure comprises a coil substrate and a coil, wherein a central hole matched with the central column is preset in the central position of the coil substrate, and the coil is arranged on the coil substrate in a surrounding manner around the central hole;
the planar coil structure can be freely sleeved on the magnetic core structure through the matching design between the central hole and the central column.
2. The magnetic element of claim 1, wherein the impedance variance of all the coils is less than a predetermined variance threshold, and the coils are connected in series in turn, wherein the number of turns of the coils is greater than 1.
3. The magnetic element of claim 2 wherein the impedance of each turn of the coil is equal.
4. The magnetic component of claim 1, wherein the shape of the central post comprises a circle.
5. The magnetic element of claim 4, wherein the coil substrate is provided with a winding area, and the coil is disposed on the winding area;
the shape of the coil comprises a circular ring.
6. The magnetic element of claim 1 wherein the coils are etched from a conductive dielectric layer, and a parting line is formed between adjacent turns of the coil.
7. The magnetic element according to any of claims 3 or 6,
the radius of the parting line i is:
Figure FDA0003627664250000011
the center column is a circular center column, the winding area is a circular ring winding area, Ra is the radius of the circular center column, Rb is the outer circular ring radius of the circular ring winding area, n is the total number of turns of a coil, n is an integer greater than or equal to 2, the value of the direction i away from the center column is larger, i is greater than or equal to 1 and less than or equal to n-1, the thickness of the conductive medium layer is equal, the dividing line i is the dividing line of the ith turn of the coil and the (i + 1) th turn, the dividing line i is circular, the circle center of the dividing line i is coincident with the circle center of the center column, and the coil is a circular ring coil.
8. A method of making a magnetic element, comprising:
forming a magnetic core structure, wherein the magnetic core structure comprises a magnetic core bottom plate, a central column and side columns which are integrally formed, the central column is arranged at the central position of the magnetic core bottom plate, and the two side columns are respectively and oppositely arranged at the edge positions of the magnetic core bottom plate;
forming a planar coil structure, wherein the planar coil structure comprises a coil substrate and a coil, and the coil is arranged on the coil substrate around the central hole;
and the planar coil structure is sleeved on the magnetic core structure through the matching design between the central hole and the central column.
9. The method of claim 8, wherein the step of forming the planar coil structure comprises:
providing the coil substrate;
forming a conductive medium layer on the coil substrate;
and etching the conductive medium layer to form the multi-turn coil.
10. An electronic device comprising the magnetic element of any of claims 1-7.
CN202210481542.XA 2022-05-05 2022-05-05 Magnetic element, manufacturing method thereof and electronic equipment Pending CN114783737A (en)

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Application Number Priority Date Filing Date Title
CN202210481542.XA CN114783737A (en) 2022-05-05 2022-05-05 Magnetic element, manufacturing method thereof and electronic equipment

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CN114783737A true CN114783737A (en) 2022-07-22

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