CN113451010A - Magnetic core structure, magnetic core subassembly and transformer - Google Patents
Magnetic core structure, magnetic core subassembly and transformer Download PDFInfo
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- CN113451010A CN113451010A CN202110569288.4A CN202110569288A CN113451010A CN 113451010 A CN113451010 A CN 113451010A CN 202110569288 A CN202110569288 A CN 202110569288A CN 113451010 A CN113451010 A CN 113451010A
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- 238000004804 winding Methods 0.000 claims abstract description 40
- 230000017525 heat dissipation Effects 0.000 claims description 6
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- 239000000306 component Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 210000001503 joint Anatomy 0.000 description 4
- 239000008358 core component Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
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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
- H01F27/24—Magnetic cores
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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
- H01F27/24—Magnetic cores
- H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
- H01F27/266—Fastening or mounting the core on casing or support
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Abstract
The invention relates to the technical field of electromagnetic components, in particular to a magnetic core structure, which comprises a magnetic core body and side columns, wherein the side columns are arranged on the magnetic core body, the length direction of the magnetic core body is consistent with that of the side columns, and the side columns are provided with winding parts for mounting windings; the length of the longitudinal section of the magnetic core body is greater than the length of the cross section of the winding part, the width of the longitudinal section of the magnetic core body is smaller than the width of the cross section of the winding part, and the area of the longitudinal section of the magnetic core body is not smaller than the area of the cross section of the winding part. The invention also provides a magnetic core assembly and a transformer comprising the magnetic core structure. The invention can reduce the height of the magnetic core without influencing the overall performance under the condition of determining the width of the window of the magnetic core, and can reduce the overall height of the chip transformer.
Description
Technical Field
The invention relates to the technical field of electromagnetic components, in particular to a magnetic core structure, a magnetic core assembly and a transformer.
Background
In the field of chip transformers, the height of the chip transformer is mainly determined by the height of a magnetic core, in the normal design process, once the performance parameters of the transformer are determined, the sectional area of the corresponding magnetic core can be determined, the magnetic core is generally designed to form a closed loop based on the sectional area of the magnetic core, and the closed loop has a U-shaped (square-shaped) or E-shaped (square-shaped) conventional standard structure. The height of the core, i.e. the core cross-sectional width 2+ the window width, can also be determined for the height of the corresponding chip transformer.
Under the normal use condition, the chip transformer of the same performance, in different service environments, because service environment space size is different, need the corresponding adjustment size of chip transformer, nevertheless because the chip transformer size of the same performance has been fixed, some scenes can't be suitable for, therefore reduced the application scope of chip transformer.
Simultaneously under novel technical introduction, modern product design requires product size more miniaturized gradually, and portable corresponds the miniaturized or the design of flattening of components and parts that need in the product, and the chip transformer influences the main components and parts of product height as in the power product, can reduce the height under the prerequisite that does not influence the performance, also is the demand in market.
Disclosure of Invention
In view of the defects of the prior art, an object of the present invention is to provide a magnetic core structure, a magnetic core assembly and a transformer, which can reduce the height of the magnetic core without affecting the overall performance under the condition that the air gap cross section width and the window width are determined, and further reduce the overall height of the chip transformer.
The invention provides a magnetic core structure, which comprises a magnetic core body and side columns, wherein the side columns are arranged on the magnetic core body, the length direction of the magnetic core body is consistent with the length direction of the side columns, and the side columns are provided with winding parts for mounting windings;
the length of the longitudinal section of the magnetic core body is greater than the length of the cross section of the winding portion, the width of the longitudinal section of the magnetic core body is less than the width of the cross section of the winding portion, and the area of the longitudinal section of the magnetic core body is not less than the area of the cross section of the winding portion.
Preferably, the top surface of the side column is connected with the bottom surface of the magnetic core body, the bottom surface of the side column is opposite to the top surface of the side column,
the longitudinal section of the magnetic core body is perpendicular to the bottom surface of the magnetic core body, and the cross section of the winding part is parallel to the bottom surface of the side column.
Preferably, the cross section of the magnetic core body is in a diamond shape, a rectangular shape or a square shape, and the cross section of the magnetic core body is parallel to the bottom surface of the magnetic core body.
Preferably, the number of the side columns is two, and the two side columns are arranged on the same side of the magnetic core body and are symmetrical relative to a central line of the magnetic core body in the length direction.
Preferably, the magnetic core structure further comprises a center pillar disposed on the magnetic core body and located between the two side pillars.
Preferably, the outer side surface of the side column is flush with the side surface of the magnetic core body in the length direction.
Preferably, the outer side surface is respectively connected with two end surfaces of the side column, and each end surface is provided with an arc surface.
Preferably, the magnetic core body is provided with a heat dissipation hole.
The invention also provides a magnetic core component, which comprises at least two magnetic core parts, wherein at least one of the at least two magnetic core parts is the magnetic core structure
The invention also provides a transformer which comprises the magnetic core assembly.
Due to the technical scheme, the invention has the following beneficial effects:
in the magnetic core structure provided by the invention, the length of the longitudinal section of the magnetic core body is greater than the length of the cross section of the winding part on the side column, the width of the longitudinal section of the magnetic core body is less than the width of the cross section of the winding part, and the area of the longitudinal section of the magnetic core body is greater than or equal to the area of the cross section of the winding part. According to the invention, through modifying the structure of the magnetic core body, under the condition that the area of the longitudinal section of the magnetic core body is not smaller than the area of the cross section of the side column winding part, the length of the longitudinal section of the magnetic core body is increased, and the width of the longitudinal section is reduced, so that the overall height of the magnetic core is reduced, and meanwhile, the performance of the magnetic core is not reduced because the area of the cross section which influences the performance of the magnetic core is not changed. Compared with a magnetic core structure in which the height of the magnetic core body is equal to the width of the side column in the related art, the magnetic core structure can reduce the height of the magnetic core without influencing the overall performance of the magnetic core under the condition of obtaining the same air gap section width and window width, can reduce the overall height of the chip transformer, and can improve the application range of the chip transformer.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiment or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic view of a magnetic core according to the related art of the present invention;
FIG. 2 is a schematic cross-sectional view of a magnetic core segment according to the related art of the present invention;
FIG. 3 is a schematic diagram of a magnetic core structure provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram of another configuration of a magnetic core configuration provided by an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of a magnetic core structure provided in an embodiment of the present invention;
FIG. 6 is a schematic diagram of a magnetic core assembly according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of another configuration of a magnetic core assembly according to an embodiment of the present invention;
in the figure: 10-window, 20-first core part, 30-second core part, 21-core body, 22-side leg, 23-center leg, 221-cross section of winding, 211-longitudinal section.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
In the design of the chip transformer, the magnetic core adopts a U-shaped (square) or E-shaped (square) standard structure, and the height of the chip transformer is completely determined by the height of the magnetic core. Fig. 1 shows a structure of a magnetic core in the related art, please refer to detail fig. 1, where 10 is a window of the magnetic core, and a height H0 of the magnetic core is a cross-sectional width H1 × 2+ a window width H2 of the magnetic core. Once the width of the cross section of the magnetic core and the width of the window are determined, the height of the magnetic core is fixed, and the overall height of the chip transformer is also fixed and cannot be reduced. However, the demand for miniaturization and flattening of components is increasing, and the inability to reduce the core height limits the range of applications. In view of the current situation, the embodiment of the invention provides a novel magnetic core structure, which can reduce the overall height of a magnetic core without changing the height of a window of the magnetic core and reducing the performance of the magnetic core. The idea and concrete means of the present invention will be explained below.
The main factor affecting the performance of the magnetic core is the cross-sectional area of the magnetic core, S is the width H1 of the cross-sectional area of the magnetic core and L1 of the cross-sectional area of the magnetic core, and in the standard design, as shown in fig. 1 and fig. 2, the thicknesses of the parts of the magnetic core are equal, and the cross-sectional areas of the magnetic core in the S1 area and the S2 area are also equal, so H1 is H3, and L1 is L3, however, the magnetic core in the standard design cannot meet the requirement of thinning, and the structure of the magnetic core in the standard design needs to be improved. The main of influence magnetic core performance is magnetic core side post structure and size, under the unchangeable prerequisite of keeping magnetic core side post structure and size, will connect the thickness compression of the magnetic core body of side post, simultaneously, the cross sectional area who keeps the magnetic core body equals or is greater than the cross sectional area of magnetic core side post to ensure that the magnetic core performance after the modification compares in the performance of the magnetic core of standard design and does not descend. Therefore, the design of the invention is as follows: h3 < H1, and S1 ≦ S2. When the cross-sectional area of the S1 region is equal to the cross-sectional area of the core of the S2 region, H1 × L1 is equal to H3 × L3, but H1 is greater than H3, corresponding to L1 being smaller than L3, for example, H3 is equal to 0.5H1, corresponding to L3 is equal to 2L1, so that the overall height of the core is reduced from 2H1+ H2 to H1+ H2 without changing the cross-sectional area of the core.
Based on the above inventive concept, the embodiment of the present invention has the following scheme:
fig. 3 to 5 illustrate a magnetic core structure provided by an embodiment of the present invention, which includes a magnetic core body 21 and a side pillar 22, where the side pillar 22 is disposed on the magnetic core body 21. Magnetic core body 21 includes the top surface, the bottom surface relative with the top surface and the side of connecting top surface and bottom surface, the side includes two sides along length direction and two sides along width direction, magnetic core body 21's cross sectional shape is rhombus, rectangle, square or other shapes, magnetic core body's cross section with magnetic core body's bottom surface is parallel. The side column 22 has a top surface, a bottom surface opposite to the top surface, and an outer side surface, an inner side surface and two end surfaces connecting the top surface and the bottom surface, wherein the outer side surface is opposite to the inner side surface, and the two end surfaces are opposite. The length direction of the magnetic core body 21 is consistent with the length direction of the side column 22, the top surface of the side column 22 is connected with the bottom surface of the magnetic core body 21, and one end of the side column, which is far away from the magnetic core body, is provided with a winding part for installing a winding. The length of the longitudinal section 211 of the magnetic core body is greater than the length of the cross section of the winding part, the width of the longitudinal section 211 of the magnetic core body is less than the width of the cross section 221 of the winding part, the area of the longitudinal section 211 of the magnetic core body is equal to the area of the cross section 221 of the winding part, wherein the longitudinal section 211 of the magnetic core body is perpendicular to the bottom surface of the magnetic core body, and the cross section 221 of the winding part is parallel to the bottom surface of the side column 22.
Specifically, the magnetic core structure may be U-shaped or E-shaped. In a possible implementation manner, the magnetic core structure is U-shaped, and includes a magnetic core body 21 and two side pillars 22, heat dissipation holes are formed in the magnetic core body, the two side pillars are disposed on the same side of the magnetic core body and are symmetrical with respect to a central line in the length direction of the magnetic core body, outer side surfaces of the two side pillars are respectively flush with side surfaces of the magnetic core body in the length direction, and inner side surfaces of the two side pillars are opposite; wherein, two side columns can be cuboid structures as shown in fig. 3, and can also be structures as shown in fig. 4, namely: each side column is columnar, and two end faces of each side column are provided with cambered surfaces which are transited from the winding parts to the top surfaces of the side columns. In another possible implementation, the magnetic core structure is E-shaped, and includes a magnetic core body, two side columns and a center pillar, wherein the center pillar and the two side columns are disposed on the same side of the magnetic core body, the center pillar is disposed at the center of the magnetic core body, the two side columns are symmetrically disposed on two sides of the center pillar, and the outer side surfaces of the two side columns are respectively flush with the side surfaces of the magnetic core body in the length direction.
The embodiment of the invention also provides a magnetic core assembly, which comprises at least two magnetic core parts, wherein one or more magnetic core parts in the at least two magnetic core parts are of the magnetic core structure described in the embodiment, so that the overall height of the combined magnetic core parts is reduced.
Fig. 5 shows one configuration of a magnetic core assembly, see fig. 5, comprising a first magnetic core segment 20 and a second magnetic core segment 30 interfacing with the first magnetic core segment. The first magnetic core part 20 comprises a magnetic core body 21 and two side columns 22 with the same structure, the two side columns 22 are arranged on the same side of the magnetic core body 21, one end of each side column 21, which is far away from the magnetic core body 21, is provided with a butting surface for butting with the second magnetic core part 30, and one end, which is close to the butting surface, of each side column is provided with a winding part for installing a winding; the length of the longitudinal section 211 of the magnetic core body 21 is greater than the length of the cross section 221 of the winding part on the side column, the width of the longitudinal section 211 of the magnetic core body is less than the width of the cross section 221 of the winding part on the side column, and the area of the longitudinal section 211 of the magnetic core body is equal to the area of the cross section 221 of the winding part on the side column. In the embodiment of the invention, the first magnetic core part and the second magnetic core part which form the magnetic core assembly have the same structure and size, for example, both the first magnetic core part and the second magnetic core part are E-shaped or U-shaped. In the magnetic core component, the shape of the magnetic core body may be a diamond shape, a rectangular shape, a square shape or other polygonal shapes, the middle portion of the magnetic core body may be provided with heat dissipation holes to facilitate heat dissipation, and the shape of the heat dissipation holes may be a circular shape or a square shape. In the magnetic core part, the length direction of the side columns is consistent with the length direction of the magnetic core body, the two side columns are basically parallel, and when the first magnetic core part is in butt joint with the second magnetic core part, the butt joint surface of the first magnetic core part is connected with the butt joint surface of the second magnetic core part.
In a specific implementation manner, the first magnetic core part and the second magnetic core part have the same structure and size and are both U-shaped. First magnetic core part and second magnetic core part all include integrated into one piece's magnetic core body and two side columns. The longitudinal section width H3 of the magnetic core body is 1/2 of the width H1 of the cross section of the winding part on the side column, and the longitudinal section length L3 of the magnetic core body is 2 times of the length L1 of the cross section of the winding part on the side column; two side columns of the first magnetic core part are butted with two side columns of the second magnetic core part to form a rectangular window, the height of the window is H2, and the height H0 of the magnetic core is equal to the longitudinal section width H3 of the magnetic core body + the longitudinal section width H3 of the magnetic core body + the height H2 of the window. Assuming H1-10 mm, L1-3 mm, and H2-3 mm, when designed according to standards in the prior art, then: the longitudinal section width H3 of the magnetic core body is 2mm equal to the width H1 of the transverse section of the side column, the longitudinal section length L3 of the magnetic core body is 10mm equal to the length L1 of the transverse section of the winding part, the cross section area S1 is 20mm equal to the longitudinal section area S2 of the magnetic core body is H1L 1, and the height H0 of the magnetic core is 2H1+ H2 is 2+3 is 7 mm; when the present invention is adopted, H3-1/2H 1-1 mm, L3-2L 1-20 mm, height H0-2H 3+ H2-1-2 + 3-5 mm, cross-sectional area S1-H1-L1-2-20 mm, and longitudinal cross-sectional area S2-H3-L3-1-20 mm. Obviously, compared with the magnetic core in the standard design, the embodiment of the invention reduces the overall height of the magnetic core without changing the sectional area of the magnetic core, and the height reduction ratio reaches (7-5)/7-28.6%.
In another specific implementation, referring to fig. 6, the magnetic core assembly includes a first magnetic core segment 20 and a second magnetic core segment 30 that is butted against the first magnetic core segment, wherein the first magnetic core segment 20 and the second magnetic core segment 30 have the same structure and size and are both E-shaped. Each of the first and second core segments 20 and 30 includes an integrally formed core body 21, a center leg 23 and two side legs 22, a longitudinal sectional width H3 of the core body 21 being 1/3 of a cross-sectional width H1 of the winding portion on the side legs 22, and a longitudinal sectional length L3 of the core body being 3 times a length L1 of the cross-sectional width L1 of the winding portion on the side legs; after the two side columns of the first magnetic core part are in butt joint with the two side columns of the second magnetic core part, one end, far away from the magnetic core body, of the middle column of the first magnetic core part is opposite to one end, far away from the magnetic core body, of the middle column of the second magnetic core part, two rectangular windows which are communicated with each other are formed between the first magnetic core part and the second magnetic core part, the window height is H2, and the height H0 of the magnetic core is equal to the longitudinal section width H3 of the magnetic core body + the longitudinal section width H3 of the magnetic core body + the window height H2. Assuming that H1 is 3mm, L1 is 9mm, and H2 is 3mm, the design is standardized in the prior art, the longitudinal section width H3 of the magnetic core body is 3mm, the longitudinal section length L3 is 9mm, the cross-sectional area S1 is 27mm, the longitudinal section area S2 is 27mm, and the height H0 is 2H1+ H2 is 9 mm. However, in the above embodiments, H3 ═ 1/3H1 to 1mm, L3 ═ 3L1 to 27mm, H0H 3+ H2 to 1 ═ 2+3 to 5mm, S1 ═ H1 ═ L1 to 3 ═ 27mm, and S2 ═ H3 ═ L3 to 1 ═ 27mm are used. Compared with the magnetic core in the standard design, the embodiment of the invention reduces the overall height of the magnetic core without changing the sectional area of the magnetic core, and the height reduction ratio of the magnetic core is (9-5)/9-44.4%.
For convenience of understanding, the above embodiments have been described by taking the first and second core segments as examples, and in practical applications, the first and second core segments need not be identical, and the core assembly may be a combination of EE type, UU type, EI type, UI type, etc., as long as the basic concept of the present invention is met and the height of the core is reduced.
An embodiment of the present invention further provides a transformer, where the transformer includes the magnetic core assembly described in the foregoing embodiment, and reference is made to the foregoing description for the magnetic core assembly, which is not repeated herein.
According to the embodiment of the invention, the structure of the first magnetic core part and/or the second magnetic core part is modified, so that the length of the longitudinal section of the magnetic core body is increased and the width of the longitudinal section is reduced under the condition that the area of the longitudinal section of the magnetic core body is equal to the area of the cross section of the winding part on the side column, the overall height of the magnetic core is reduced, and meanwhile, the performance of the magnetic core is not reduced because the area of the section influencing the performance of the magnetic core is not changed. Compare in the magnetic core structure that magnetic core body height and side post width equal among the correlation technique, can be under the condition that obtains the same air gap cross-section width and window width, reduce the magnetic core height and do not influence magnetic core wholeness ability, can reduce the overall height of chip transformer, promote the application scope of chip transformer.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A magnetic core structure is characterized by comprising a magnetic core body and side columns, wherein the side columns are arranged on the magnetic core body, the length direction of the magnetic core body is consistent with the length direction of the side columns, and the side columns are provided with winding parts for mounting windings;
the length of the longitudinal section of the magnetic core body is greater than the length of the cross section of the winding portion, the width of the longitudinal section of the magnetic core body is less than the width of the cross section of the winding portion, and the area of the longitudinal section of the magnetic core body is not less than the area of the cross section of the winding portion.
2. The core structure of claim 1, wherein a top surface of the leg meets a bottom surface of the core body, the bottom surface of the leg being opposite the top surface of the leg,
the longitudinal section of the magnetic core body is perpendicular to the bottom surface of the magnetic core body, and the cross section of the winding part is parallel to the bottom surface of the side column.
3. The core structure of claim 1, wherein the cross-sectional shape of the core body is diamond, rectangular, or square, and the cross-section of the core body is parallel to the bottom surface of the core body.
4. The core structure according to any of claims 1 to 3, wherein the number of side legs is two, and the two side legs are disposed on the same side of the core body and are symmetrical with respect to a center line in a length direction of the core body.
5. The magnetic core structure of claim 4, further comprising a center leg disposed on the magnetic core body between the two side legs.
6. The core structure of claim 4, wherein the outer side of the leg is flush with the side of the core body in the lengthwise direction.
7. The magnetic core structure of claim 6, wherein the outer side surfaces are respectively connected to two end surfaces of the side legs, each of the end surfaces having an arc surface.
8. The magnetic core structure of claim 6, wherein the magnetic core body is provided with heat dissipation holes.
9. A magnetic core assembly, characterized in that the magnetic core assembly comprises at least two magnetic core segments, at least one of the at least two magnetic core segments being a magnetic core structure according to any of claims 1-8.
10. A transformer, characterized in that it comprises a magnetic core assembly according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110569288.4A CN113451010A (en) | 2021-05-25 | 2021-05-25 | Magnetic core structure, magnetic core subassembly and transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110569288.4A CN113451010A (en) | 2021-05-25 | 2021-05-25 | Magnetic core structure, magnetic core subassembly and transformer |
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| CN113451010A true CN113451010A (en) | 2021-09-28 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5844706A (en) * | 1981-09-11 | 1983-03-15 | Kijima Musen Kk | Ferrite core for composite transformer |
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2021
- 2021-05-25 CN CN202110569288.4A patent/CN113451010A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5844706A (en) * | 1981-09-11 | 1983-03-15 | Kijima Musen Kk | Ferrite core for composite transformer |
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