CN113284724A - Winding assembly for reducing parasitic capacitance between same-side winding layers of planar transformer - Google Patents
Winding assembly for reducing parasitic capacitance between same-side winding layers of planar transformer Download PDFInfo
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- CN113284724A CN113284724A CN202110496350.1A CN202110496350A CN113284724A CN 113284724 A CN113284724 A CN 113284724A CN 202110496350 A CN202110496350 A CN 202110496350A CN 113284724 A CN113284724 A CN 113284724A
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- planar transformer
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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
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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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
- H01F27/30—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
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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
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Of Transformers For General Uses (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
本发明公开了一种用于减小平面变压器同边绕组层间寄生电容的绕组组件，套设在平面变压器的磁芯上，包括PCB板、第一线圈和第二线圈；PCB板由上至下包含三层；第一线圈、第二线圈均为螺旋线圈，匝数相同且形状相同，其中，第一线圈设置在PCB板的第一层，第二线圈对应第一线圈设置在PCB板的第三层；第一线圈在内的一端、第二线圈在外的一端均通过过孔连接至PCB板的第二层且在PCB板的第二层通过覆铜连接。本发明能够降低绕组寄生电容，减小绕组损耗，提高变换效率。
The invention discloses a winding assembly for reducing parasitic capacitance between layers of windings on the same side of a planar transformer, which is sleeved on the magnetic core of the planar transformer and includes a PCB board, a first coil and a second coil; The bottom consists of three layers; the first coil and the second coil are both spiral coils with the same number of turns and the same shape, wherein the first coil is arranged on the first layer of the PCB board, and the second coil is arranged on the PCB board corresponding to the first coil. The third layer; the inner end of the first coil and the outer end of the second coil are connected to the second layer of the PCB board through vias and connected by copper cladding on the second layer of the PCB board. The invention can reduce the parasitic capacitance of the winding, reduce the loss of the winding, and improve the conversion efficiency.
Description
Technical Field
The invention relates to the field of magnetic element loss and EMI suppression in power electronics, in particular to a winding assembly for reducing parasitic capacitance between same-side winding layers of a planar transformer.
Background
Miniaturization and high power density have become the trend of switching power supplies. In order to meet the miniaturization requirement, the switching power supply is developing to a higher frequency, and the generated Electromagnetic Interference (EMI) is also becoming more and more serious. Magnetic elements in the switching power supply, such as inductors or transformers, are used as the core of the design of the switching power supply, and the EMI of the system can be inhibited to a certain extent by reducing the parasitic parameters of the magnetic elements. Meanwhile, the influence of the parasitic parameters of the transformer on the efficiency of the switching power supply is increasingly greater, so that the pursuit of the switching power supply for high efficiency is limited. In order to adapt to the development of switching power supplies, planar transformers, which have significant advantages in terms of size and flexibility over conventional transformers, are increasingly being used. However, the parasitic capacitance generated between the coils in the conventional planar transformer is large, which affects the improvement of the efficiency and high power density of the switching power supply.
Disclosure of Invention
The invention aims to solve the technical problem of providing a winding assembly for reducing the parasitic capacitance between the same-side winding layers of a planar transformer aiming at the defects involved in the background technology.
The invention adopts the following technical scheme for solving the technical problems:
the winding assembly is used for reducing the parasitic capacitance between the same-side winding layers of the planar transformer, is sleeved on the magnetic core of the planar transformer and comprises a PCB (printed circuit board), a first coil and a second coil;
the PCB comprises three layers from top to bottom;
the first coil and the second coil are spiral coils, the number of turns of the first coil is the same, the number of turns of the second coil is the same, and the shape of the second coil is the same, wherein the first coil is arranged on a first layer of the PCB, and the second coil is arranged on a third layer of the PCB corresponding to the first coil;
the first coil and the second coil are insulated, and two ends of the first coil and two ends of the second coil are positioned on the same side of the magnetic column and on the same straight line;
and one end of the first coil inside and one end of the second coil outside are both connected to the second layer of the PCB through via holes and connected with the second layer of the PCB through copper cladding.
As a further optimization scheme of the winding assembly for reducing the parasitic capacitance between the same-side winding layers of the planar transformer, the first coil and the second coil are circular spiral coils.
As a further optimization scheme of the winding assembly for reducing the parasitic capacitance between the same-side winding layers of the planar transformer, the first coil and the second coil are square spiral coils.
The winding assembly used for reducing the parasitic capacitance between the same-side winding layers of the planar transformer further comprises a secondary winding, and the secondary winding is arranged on the second layer of the PCB.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
the invention discloses a winding assembly for reducing the parasitic capacitance between the same-side winding layers of a planar transformer, which can reduce the parasitic capacitance of a winding, reduce the winding loss and improve the conversion efficiency.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of the first coil, the second coil and the secondary winding of the present invention;
fig. 3 is an exploded view of a planar transformer to which the present invention is applied.
In the figure, 1-PCB, 2-first coil, 3-second coil, 4-secondary winding, 5-magnetic core of planar transformer.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.
As shown in fig. 1 and fig. 2, the present invention discloses a winding assembly for reducing the parasitic capacitance between the same-side winding layers of a planar transformer, which is sleeved on the magnetic core of the planar transformer and comprises a PCB board, a first coil and a second coil;
the PCB comprises three layers from top to bottom;
the first coil and the second coil are spiral coils, the number of turns of the first coil is the same, the number of turns of the second coil is the same, and the shape of the second coil is the same, wherein the first coil is arranged on a first layer of the PCB, and the second coil is arranged on a third layer of the PCB corresponding to the first coil;
the first coil and the second coil are insulated, and two ends of the first coil and two ends of the second coil are positioned on the same side of the magnetic column and on the same straight line;
and one end of the first coil inside and one end of the second coil outside are both connected to the second layer of the PCB through via holes and connected with the second layer of the PCB through copper cladding.
The first coil and the second coil are of different shapes, and can adopt a circular spiral coil or a square spiral coil. In addition, the present invention may further include a secondary winding disposed on a second layer of the PCB, as shown in fig. 2.
The first coil and the second coil can be directly insulated by a PCB material, and an insulating layer can also be additionally arranged.
The first and second coils in fig. 1 and 2 each include 3 turns of coils, and 3 pairs of coil groups are sequentially formed from outside to inside, the first turn of coil of the first coil and the first turn of coil of the second coil form a first pair of coil groups, the second turn of coil of the first coil and the second turn of coil of the second coil form a second pair of coil groups, the third turn of coil of the first coil and the third turn of coil of the second coil form a third pair of coil groups, and lumped parasitic capacitors are arranged between the first and second coils
Wherein i is the serial number of the coil group between the upper and lower layers, CpiIs the parasitic capacitance between the ith set of opposing coil sets, and n is the total number of sets of opposing coil sets.
CpiCan be represented by formula
Determining, wherein epsilon is a dielectric constant and is determined by the material of the PCB; siThe area is the opposite area of the ith group of coil groups; d is the distance from the first coil to the second coil.
The traditional winding assembly structure is that the ends far away from the central hole are connected in pairs or the ends close to the central hole are connected in pairs, and the voltage difference of the upper layer and the lower layer is reduced from U to 0, CpCan be determined by the formula (1) or (2):
wherein, the voltage difference between the ith group and the corresponding coil group is set as UiThen C ispWhen the ends far away from the central hole are connected in pairs, CpA value of (d); cpWhen the ends close to the central hole are connected in pairs, CpThe value of (c).
It can be seen that when n is>At 1 hour, there is always Cp<Cp'<Cp". In addition, in practical conditions, n is larger than 1, so that the parasitic capacitance between the same side layers of the winding assembly is smaller than that of the traditional winding assembly when other conditions are the same.
Fig. 3 is an explosion diagram of a planar transformer to which the present invention is applied, which can reduce the parasitic capacitance of the winding, reduce the loss of the winding, and improve the conversion efficiency.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The winding assembly is used for reducing the parasitic capacitance between the same-side winding layers of the planar transformer and is sleeved on the magnetic core of the planar transformer, and the winding assembly is characterized by comprising a PCB (printed circuit board), a first coil and a second coil;
the PCB comprises three layers from top to bottom;
the first coil and the second coil are spiral coils, the number of turns of the first coil is the same, the number of turns of the second coil is the same, and the shape of the second coil is the same, wherein the first coil is arranged on a first layer of the PCB, and the second coil is arranged on a third layer of the PCB corresponding to the first coil;
the first coil and the second coil are insulated, and two ends of the first coil and two ends of the second coil are positioned on the same side of the magnetic column and on the same straight line;
and one end of the first coil inside and one end of the second coil outside are both connected to the second layer of the PCB through via holes and connected with the second layer of the PCB through copper cladding.
2. The winding assembly for reducing parasitic capacitance between windings on the same side of a planar transformer as claimed in claim 1, wherein said first and second coils are circular spiral coils.
3. The winding assembly for reducing parasitic capacitance between windings on the same side of a planar transformer as claimed in claim 1, wherein said first and second coils are square spiral coils.
4. The winding assembly for reducing parasitic capacitance between co-winding layers of a planar transformer according to claim 1, further comprising a secondary winding disposed on a second layer of the PCB board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110496350.1A CN113284724A (en) | 2021-05-07 | 2021-05-07 | Winding assembly for reducing parasitic capacitance between same-side winding layers of planar transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110496350.1A CN113284724A (en) | 2021-05-07 | 2021-05-07 | Winding assembly for reducing parasitic capacitance between same-side winding layers of planar transformer |
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| Publication Number | Publication Date |
|---|---|
| CN113284724A true CN113284724A (en) | 2021-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110496350.1A Pending CN113284724A (en) | 2021-05-07 | 2021-05-07 | Winding assembly for reducing parasitic capacitance between same-side winding layers of planar transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115172020A (en) * | 2022-07-11 | 2022-10-11 | 西安交通大学 | EMI filter based on double-winding folding PCB structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040027224A1 (en) * | 2002-05-31 | 2004-02-12 | International Rectifier Corporation | Planar transformer arrangement |
| CN211699961U (en) * | 2020-05-07 | 2020-10-16 | 台达电子企业管理（上海）有限公司 | Winding assembly and magnetic element |
| CN211879192U (en) * | 2019-11-21 | 2020-11-06 | 伊戈尔电气股份有限公司 | Coil structure capable of reducing interlayer field intensity, winding structure and transformer |
| CN112311204A (en) * | 2020-10-21 | 2021-02-02 | 哈尔滨工业大学 | Segmented series compensation method for reducing coil loss of resonant converter |
-
2021
- 2021-05-07 CN CN202110496350.1A patent/CN113284724A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040027224A1 (en) * | 2002-05-31 | 2004-02-12 | International Rectifier Corporation | Planar transformer arrangement |
| CN211879192U (en) * | 2019-11-21 | 2020-11-06 | 伊戈尔电气股份有限公司 | Coil structure capable of reducing interlayer field intensity, winding structure and transformer |
| CN211699961U (en) * | 2020-05-07 | 2020-10-16 | 台达电子企业管理（上海）有限公司 | Winding assembly and magnetic element |
| CN112311204A (en) * | 2020-10-21 | 2021-02-02 | 哈尔滨工业大学 | Segmented series compensation method for reducing coil loss of resonant converter |
Non-Patent Citations (1)
| Title |
|---|
| 王世山等: "利用平面线圈消除电容器寄生电感的影响", 《电工电能新技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115172020A (en) * | 2022-07-11 | 2022-10-11 | 西安交通大学 | EMI filter based on double-winding folding PCB structure |
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Application publication date: 20210820 |