CN115588550A - Magnetic core structure - Google Patents
Magnetic core structure Download PDFInfo
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- CN115588550A CN115588550A CN202211206804.8A CN202211206804A CN115588550A CN 115588550 A CN115588550 A CN 115588550A CN 202211206804 A CN202211206804 A CN 202211206804A CN 115588550 A CN115588550 A CN 115588550A
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- magnetic
- winding
- magnetic core
- core structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/10—Composite arrangements of magnetic circuits
- H01F3/14—Constrictions; Gaps, e.g. air-gaps
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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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/06—Cores, Yokes, or armatures made from wires
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/10—Composite arrangements of magnetic circuits
-
- 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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F2027/348—Preventing eddy currents
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
The invention provides a magnetic core structure, and the magnetic core of the invention comprises four magnetic columns, wherein the four magnetic columns comprise two winding main magnetic columns and two side columns. The four magnetic columns are arranged in a line and sequentially comprise a side column, a winding main magnetic column and a side column. The winding of the planar inductor is a flat wire, a PCB winding or a conventional wire, the inductor winding is wound around the two main winding magnetic poles, and one or more turns of the wire are wound on each layer. This planar inductance realizes the two-way circulation of main magnetic column magnetic flux through adding the side post, reduces magnetism spare height and inductance loss. The invention is suitable for various converters, has extremely high universality and can greatly reduce the parasitic capacitance and the winding loss of the planar inductor.
Description
Technical Field
The invention belongs to the technical field of electricians, and relates to a planar inductor design method capable of reducing interlayer capacitance and winding loss.
Background
The planar inductor has the advantages of good high-frequency performance, small size, strong heat dissipation capability and the like, is suitable for various converters, is widely applied to the fields of aerospace, electric automobiles, new energy power generation and the like, and pushes various power supply products to break through innovation in the direction of high efficiency and high power density. The traditional planar inductor mainly has two problems, namely that the dead area between planar inductor windings is large, so that higher parasitic capacitance is brought, and the magnetomotive force is increased along with the increase of the number of turns, so that higher winding loss is brought. There are many design methods for winding parasitic capacitance and winding loss in the current literature, but the design methods are still limited in the framework of one magnetic core, and the optimization effect is limited.
Disclosure of Invention
In order to solve the above problems, the present invention provides a design scheme of a planar inductor with low parasitic capacitance and low winding loss, which includes a special magnetic core structure and a winding scheme. Compared with the traditional scheme, the parasitic capacitance of the inductance winding can be reduced by about 80%, the winding loss can be greatly reduced by about 60%, and the volume of the magnetic piece is not increased.
The invention adopts the following technical scheme for realizing the purpose: a magnetic core structure comprises two wound main magnetic poles and two side poles, wherein a PCB (printed circuit board) is used for wiring, and an inductance winding is wound on each main magnetic pole.
Furthermore, the magnetic core structure comprises a substrate, the substrate is provided with four magnetic columns, windings are wound on the magnetic columns, and an upper cover plate is arranged above the substrate.
Further, the length, the width and the height of the upper cover plate are the same as those of the base plate; or the upper cover plate comprises a left part and a right part, the two parts of the cover plates are completely the same, the length of the two parts of the cover plates is half of that of the bottom base plate, the width and the height of the two parts of the cover plates are the same as those of the base plate, and a longitudinal air gap is arranged between the two parts of the cover plates.
As a preferred embodiment of the present application, the main magnetic core is one of a circle, a square, a racetrack shape or an oval shape, and the side magnetic pillar structure is a surrounding shape.
Furthermore, the inductance winding is wound around the main magnetic poles, the winding directions of the inductance windings on the two main magnetic poles are opposite, and the two main magnetic poles are wound for the same number of turns.
Further, the inductance winding is a flat wire, a PCB wire or a conventional wire.
Furthermore, when the inductance winding surrounds the main magnetic pillar, the same height is kept for one turn, namely, a single layer and a single turn.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
(1) The inductance winding is wound with two main magnetic columns, so that the parasitic capacitance of the planar inductance is reduced.
(2) The inductance value is adjusted by adjusting the air gap of the middle column, the side magnetic columns are auxiliary magnetic columns, the upper substrate is directly attached, the air gap does not need to be additionally added, and the manufacturing process is simple.
(3) The upper cover plate double-substrate scheme forms a distributed air gap, so that the eddy current loss is reduced.
(4) The double-magnetic-core winding scheme reduces magnetomotive force and reduces winding loss.
(5) The number of the air gaps is increased, and eddy current loss caused by magnetic leakage at the air gaps is reduced.
Drawings
Fig. 1 is an overall schematic diagram of a planar inductor proposed in the present invention;
FIG. 2 is a schematic diagram of a winding method of a planar inductive winding according to the present invention;
FIG. 3 is a magnetic flux schematic of a planar inductor according to the present invention;
FIG. 4 is a schematic diagram of a conventional planar inductance scheme;
FIG. 5 is an impedance curve of a conventional planar inductor and a planar inductor of the present invention;
FIG. 6 is a plane inductor with two substrates as the upper cover plate according to the present invention;
in the figure, 1-a first main magnetic column, 2-a second main magnetic column, 3-a first side magnetic column, 4-a second side magnetic column, 5-a winding, 6-an upper cover plate and 7-an air gap.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
This embodiment provides a magnetic core structure, magnetic core structure contains two wire-wound main magnetic columns, and two side posts use the PCB to walk the line, at every around there being inductance winding 5 on the main magnetic column, magnetic core structure contains the base plate, it has four magnetic columns to be provided with the base plate on the base plate, winding 5 has been walked on the magnetic column, and the base plate top is upper cover plate 6.
Further, the upper cover plate 6 has the same length, width and height as the base plate; or, the upper cover plate 6 comprises a left part and a right part, the two parts of cover plates are completely the same, the length of the two parts of cover plates is half of that of the bottom base plate, the width and the height of the two parts of cover plates are the same as those of the base plate, and a longitudinal air gap 7 is arranged between the two parts of cover plates.
The invention has four magnetic columns and two substrates. The four magnetic columns are connected with the lower substrate and comprise two winding main magnetic columns and two side magnetic columns. When the upper cover plate 6 is a whole substrate, the side magnetic pillars are tightly attached to the upper substrate, and an air gap 7 is formed between the main magnetic pillar and the upper substrate, so that the length of the air gap 7 is designed according to the required inductance value. When the upper cover plate 6 is two small split substrates, an air gap 7 exists between the main magnetic column and the side magnetic column and the two upper cover plates 6, an air gap 7 also exists between the two upper substrates, and the air gaps 7 are adjusted to adjust the inductance value.
As a preferred embodiment of the present application, the main magnetic core is one of a circle, a square, a racetrack shape or an oval shape, and the side magnetic pillar structure is a surrounding shape.
Further, the inductance winding 5 is wound around the main magnetic poles, the winding directions of the inductance windings 5 on the two main magnetic poles are opposite, and the two main magnetic poles are wound for the same number of turns.
Further, the main magnetic pillar is wound by using a flat wire, the PCB winding 5 or a conventional wire to form an inductance device. Firstly, clockwise (or anticlockwise) winding one main magnetic pole, after winding a reasonable number of turns, winding the other magnetic pole anticlockwise (or clockwise), and keeping the same number of turns of the two magnetic poles. Furthermore, the inductance winding 5 is maintained at the same height for one turn, i.e. a single layer and a single turn, when it surrounds the main magnetic pole.
Fig. 1 shows a planar inductor design with low parasitic capacitance and low winding 5 loss according to the present invention, which has two wound main magnetic poles, i.e. a first main magnetic pole 1, a second main magnetic pole 2, two side magnetic poles without air gap 7, a first side magnetic pole 3, a second side magnetic pole 4, and an inductor winding 5 wound around the main magnetic poles.
As shown in fig. 2, the winding legs of the planar inductor wind two magnetic cores, each layer of one-turn winding 5 firstly winds the first main magnetic leg 1 clockwise (or anticlockwise), and then winds the second main magnetic leg 2 anticlockwise (or clockwise) after the first magnetic leg is wound.
As shown in fig. 3, the magnetic flux of the planar inductor has three paths in total.
As shown in fig. 4, in order to realize an 8-turn winding 5, if 4 layers of plates are still used, two turns of winding 5 need to be wound for each layer.
As shown in fig. 5, compared with the planar inductor of the conventional single core solution, the resonant frequency of the inductance solution proposed by this patent shifts backward, and the parasitic capacitance decreases from 19.4pF to 4.5pF.
As shown in fig. 6, the upper cover plate 6 may be composed of two base plates and form a longitudinal air gap 7.
Claims (7)
1. A magnetic core structure, characterized by: the magnetic core structure comprises two wound main magnetic columns and two side columns, PCB wiring is used, and an inductance winding is wound on each main magnetic column.
2. A magnetic core structure according to claim 1, characterized in that: the magnetic core structure comprises a substrate, the substrate is arranged on the substrate and provided with four magnetic columns, windings are wound on the magnetic columns, and an upper cover plate is arranged above the substrate.
3. The magnetic core structure of claim 1, wherein: the length, the width and the height of the upper cover plate are the same as those of the base plate;
or the upper cover plate comprises a left part and a right part, the two parts of the cover plates are completely the same, the length of the two parts of the cover plates is half of that of the bottom base plate, the width and the height of the two parts of the cover plates are the same as those of the base plate, and a longitudinal air gap is arranged between the two parts of the cover plates.
4. The magnetic core structure of claim 1, wherein: the main magnetic core is one of round, square, racetrack or oval, and the side magnetic column structure is in a surrounding shape.
5. A magnetic core structure according to claim 1, characterized in that: the inductance winding is wound around the main magnetic poles, the winding directions of the inductance windings on the two main magnetic poles are opposite, and the two main magnetic poles are wound for the same number of turns.
6. A magnetic core structure according to claim 1, characterized in that: the inductance winding is a flat wire, a PCB wire or a conventional wire.
7. The magnetic core structure of claim 1, wherein: when the inductance winding surrounds the main magnetic pole, the same height is kept for one turn, namely, a single layer and a single turn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211206804.8A CN115588550A (en) | 2022-09-30 | 2022-09-30 | Magnetic core structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211206804.8A CN115588550A (en) | 2022-09-30 | 2022-09-30 | Magnetic core structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115588550A true CN115588550A (en) | 2023-01-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211206804.8A Pending CN115588550A (en) | 2022-09-30 | 2022-09-30 | Magnetic core structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116978668A (en) * | 2023-06-07 | 2023-10-31 | 淮安顺络文盛电子有限公司 | Inductance element and preparation method thereof |
-
2022
- 2022-09-30 CN CN202211206804.8A patent/CN115588550A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116978668A (en) * | 2023-06-07 | 2023-10-31 | 淮安顺络文盛电子有限公司 | Inductance element and preparation method thereof |
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