CN113972057A - Multi-layer board transformer for series resonance circuit - Google Patents
Multi-layer board transformer for series resonance circuit Download PDFInfo
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- CN113972057A CN113972057A CN202111517839.9A CN202111517839A CN113972057A CN 113972057 A CN113972057 A CN 113972057A CN 202111517839 A CN202111517839 A CN 202111517839A CN 113972057 A CN113972057 A CN 113972057A
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- 238000004804 winding Methods 0.000 claims abstract description 251
- 239000003990 capacitor Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000003071 polychlorinated biphenyls Chemical class 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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
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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
-
- 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
Abstract
The invention provides a multilayer board transformer applied to a series resonance circuit, which comprises a magnetic core, a primary winding and a secondary winding, wherein the primary winding and the secondary winding are arranged on a magnetic column in the magnetic core in a surrounding manner, the primary winding and the secondary winding are sequentially stacked, the secondary winding is arranged on the outermost layer and a layer adjacent to the secondary winding, the primary windings with the same number as that of the coils are arranged on the outermost layer, and the other primary windings are arranged on the inner layer. According to the multilayer board transformer provided by the invention, the specific coils and the specific number are arranged on the specific layer of the multilayer board transformer, so that the low EMI noise of the series resonance circuit can be realized without using shielding coils.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a multilayer board transformer for a series resonant circuit.
Background
The traditional multilayer transformer used in the series resonance circuit generally uses 12 layers or 14 layers of plates by drawing coils on a circuit board so as to achieve the required number of turns and structure, and the multilayer transformer has a plurality of layers, and the circuit board has complex manufacturing process and higher price.
Because the primary winding of the transformer of the series resonant circuit is an interference source of the EMC, in order to solve the problem of the EMC, an additional layer is usually added between the primary layer and the secondary layer of the multi-layer transformer, and a shielding coil is placed on the additional layer to shield the EMI noise, so that the number of layers of the transformer board is increased, and the manufacturing cost is increased.
Disclosure of Invention
In view of the above problems, the present invention provides a multi-layer board transformer for a series resonant circuit, which achieves low EMI noise of the series resonant circuit without using a shielding coil by arranging a specific number of coils in a specific layer of the multi-layer board transformer.
In order to achieve the above object, a multilayer board transformer of the present invention employs a scheme,
a multi-layer plate transformer comprises a magnetic core, a primary winding and a secondary winding, wherein the primary winding and the secondary winding are arranged on a magnetic column in the magnetic core in a surrounding mode, the primary winding and the secondary winding are sequentially stacked, the secondary winding is arranged on the outermost layer and on the layer close to the outermost layer, the primary windings with the same number as that of the coils of the secondary winding are arranged, and the other primary windings are arranged on the inner layer.
In a specific embodiment, the secondary winding includes a first secondary winding and a second secondary winding, the first secondary winding has the same current as the primary winding, the second secondary winding has the opposite current to the primary winding, the first secondary winding is disposed on one outermost layer, and the second secondary winding is disposed on the other outermost layer.
In a specific embodiment, the secondary winding includes a first secondary winding and a second secondary winding, the first secondary winding has the same current as the primary winding, the second secondary winding has the opposite current to the primary winding, a part of the first secondary winding and a part of the second secondary winding are disposed on one outermost layer, and the other part of the first secondary winding and the other part of the second secondary winding are disposed on the other outermost layer.
In a specific embodiment, the secondary winding includes a first secondary winding and a second secondary winding, the current flowing through the first secondary winding is the same as that of the primary winding, the current flowing through the second secondary winding is opposite to that of the primary winding, a part of the first secondary winding is disposed on one outermost layer, a part of the second secondary winding is disposed on a second outer layer adjacent to the outermost layer, a part of the primary winding is disposed on an inner layer adjacent to the second outer layer, and the number of coils of the primary winding disposed on the inner layer is the same as that of the secondary winding on the outermost layer; the other part of the first secondary winding is arranged on the other outermost layer, the other part of the second secondary winding is arranged on a secondary outer layer adjacent to the outermost layer, the other part of the primary winding is arranged on an inner layer adjacent to the secondary outer layer, and the number of the primary windings arranged on the inner layer is the same as that of the secondary windings on the outermost layer.
In a specific embodiment, the secondary winding includes a first secondary winding and a second secondary winding, the current flowing through the first secondary winding is the same as that of the primary winding, the current flowing through the second secondary winding is opposite to that of the primary winding, a part of the first secondary winding is disposed on one outermost layer, a part of the second secondary winding is disposed on a second outer layer adjacent to the outermost layer, a part of the primary winding is disposed on an inner layer adjacent to the second outer layer, and the number of coils of the primary winding disposed on the inner layer is the same as that of the secondary winding on the outermost layer; the other part of the second secondary winding is arranged on the other outermost layer, the other part of the first secondary winding is arranged on a secondary outer layer adjacent to the outermost layer, the other part of the primary winding is arranged on an inner layer adjacent to the secondary outer layer, and the number of the primary windings arranged on the inner layer is the same as that of the secondary windings on the outermost layer.
In a specific embodiment, the sum of the coil widths of the primary windings adjacent to the secondary winding is not less than the sum of the coil widths of the secondary windings.
The multilayer board transformer provided by the invention can be applied to a series resonance circuit, and the specific coils and the specific number are arranged on the specific layer of the multilayer board transformer, so that the low EMI noise of the series resonance circuit can be realized without using a shielding coil, and the loss of the transformer coil is reduced.
Drawings
Fig. 1 is a schematic diagram of a transformer according to the present invention.
Fig. 2 is a schematic structural diagram of a transformer according to a first embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a transformer according to a second embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a transformer according to a third embodiment of the present invention.
Fig. 5 is a schematic diagram of a half-bridge LLC line.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the drawings attached hereto are only for the purpose of illustration and description, and are not intended to limit the scope of the present invention, which is defined by the claims, so as not to limit the scope of the present invention.
Fig. 1 shows a schematic diagram of the transformer of the present invention, the primary side of the transformer T1 has a primary winding N1, the secondary side of the transformer has secondary windings N2 and N3, the non-dotted terminal of the secondary winding N2 is connected to the dotted terminal of the secondary winding N3, and the directions of the secondary windings N2 and N3 are opposite.
Fig. 2 is a schematic structural diagram of a first embodiment of the present invention, T11 is a magnetic core of a transformer T1, a primary winding and a secondary winding of the transformer T1 are implemented by using six layers of PCB boards, a secondary winding N2 is disposed on a first layer of PCB board, a secondary winding N3 is disposed on a sixth layer of PCB board, a primary winding N1 is disposed between the secondary winding N2 and the secondary winding N3, a primary winding N1 is divided into four parts, namely, a winding N11, a winding N12, a winding N13, and a winding N14, which are sequentially disposed on a second layer, a third layer, a fourth layer, and a fifth layer of PCB board, a winding N11 has the same number of coils as a winding N2, a same winding direction, a number of coils of a winding N14 is not greater than a number of coils of a winding N3, for example, a winding N14 has the same number of coils as a winding N3.
In some embodiments, the sum of the coil widths of winding N11 is no less than the sum of the coil widths of winding N2, and the sum of the coil widths of winding N14 is no less than the sum of the coil widths of winding N3. The outermost winding is a secondary winding, the magnetic core T11 is collected as a secondary, and if the primary winding is completely blocked inside by the outermost secondary winding, the EMI effect is better in consistency. If the primary winding is not fully blocked by the secondary winding, additional EMI interference is introduced. The interference is related to the installation of the iron core and the position of the transformer on a product, and the consistency is difficult to control.
Fig. 3 is a schematic structural diagram of a second embodiment of the present invention, a primary winding and a secondary winding of a transformer T1 are also implemented by using six layers of PCB boards, a winding N21 is a part of a secondary winding N2, a winding N22 is the rest of the secondary winding N2, a winding N31 is a part of a secondary winding N3, a winding N32 is the rest of the secondary winding N3, a winding N21 and a winding N31 are both disposed on the first layer of PCB board, a winding N22 and a winding N32 are both disposed on the sixth layer of PCB board, four parts of the primary winding, namely a winding N11, a winding N12, a winding N13, and a winding N14, are sequentially disposed on the second layer, the third layer, the fourth layer, and the fifth layer of PCB board, the number of coils of the winding N11 is equal to the sum of coils of a winding N21 and a winding N31, and the number of coils of a winding N14 is equal to the sum of a winding N22 and a coil N32.
In some embodiments, the sum of the coil widths of winding N11 and winding N14 should be no less than the sum of the coil widths of winding N21, winding N22, winding N31, and winding N32.
Fig. 4 is a schematic structural diagram of a third embodiment of the present invention, where a primary winding and a secondary winding of a transformer T1 are implemented by using eight layers of PCBs, a winding N21 is a part of a secondary winding N2, an N22 is the rest of a secondary winding N2, a winding N31 is a part of a secondary winding N3, a winding N32 is the rest of a secondary winding N3, N21 is disposed on a first layer of PCB, an N31 is disposed on a second layer of PCB, an N22 is disposed on a seventh layer of PCB, and an N32 is disposed on an eighth layer of PCB, after the two secondary windings are interleaved, the positions of the two windings are relatively symmetric, so that common mode interference between the two secondary windings and the primary winding is easier to directly cancel, and leakage inductance between the two secondary windings is reduced, thereby improving efficiency. The four partial windings N11, N12, N13 and N14 of the primary winding are sequentially arranged on the third layer, the fourth layer, the fifth layer and the sixth layer of the PCB, the number of the coils of the winding N11 is not more than the number of the coils of the winding N31, such as the number of the coils of the winding N31, the number of the coils of the winding N14 is equal to the number of the coils of the winding N22, and the winding directions of the coils are the same.
In some embodiments, the sum of the coil widths of winding N11 should be no less than the sum of the coil widths of N22, and the sum of the coil widths of winding N14 should be no less than the sum of the coil widths of winding N31.
The winding N11 and the winding N14 in the transformer T1 are part of the primary winding N1, and by setting specific number and position arrangement of the coils, no extra shielding winding is needed to be added, so that the efficiency of electric energy conversion is improved, the layer number of a circuit board is reduced, and the cost is reduced.
Fig. 5 is a schematic diagram of a half-bridge LLC line, and the transformer T1 adopts the structure shown in fig. 2, fig. 3 or fig. 4, and by combining the LLC line and the transformer T1, and by arranging specific coils and numbers in specific layers of the transformer T1, low EMI noise of the series resonant circuit can be achieved without using shielding coils.
In the prior art, in a half-bridge LLC line, a transformer T1 has a turn of shielding winding between the primary side and the secondary side, and is connected in parallel to the primary side ground for shielding the primary side from EMI interference with the secondary side. According to the technical scheme, the directions of a secondary winding and a primary winding are the same, the primary windings are placed in the same shape according to the winding shape of the secondary winding, and therefore the interference of the primary winding to the secondary winding is the same as the interference of the secondary winding to the primary winding in amplitude and phase, and can be naturally counteracted.
Since the winding N11 or N14 of this layer is part of the primary side, the transformer coil losses are very low compared to the conventional practice of using a shield winding.
For the other secondary winding N3, which is opposite to the primary winding, the invention uses the least number of turns of the primary winding to place the side close to the secondary winding. Thus, the coil loss of the transformer is reduced to the maximum extent under the condition of minimum EMI.
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 (7)
1. A multi-layer plate transformer comprises a magnetic core, a primary winding and a secondary winding, wherein the primary winding and the secondary winding are arranged on a magnetic column in the magnetic core in a surrounding mode, and the primary winding and the secondary winding are sequentially stacked.
2. The multi-layer plate transformer of claim 1, wherein the secondary winding comprises a first secondary winding and a second secondary winding, the first secondary winding passes the same current as the primary winding, the second secondary winding passes the opposite current as the primary winding, the first secondary winding is disposed on one of the outermost layers, and the second secondary winding is disposed on the other outermost layer.
3. The multilayer plate transformer of claim 1, wherein the secondary winding comprises a first secondary winding and a second secondary winding, the first secondary winding passes the same current as the primary winding, the second secondary winding passes a current opposite the primary winding, a portion of the first secondary winding and a portion of the second secondary winding are disposed on one of the outermost layers, and another portion of the first secondary winding and another portion of the second secondary winding are disposed on the other outermost layer.
4. The multilayer plate transformer according to claim 1, wherein the secondary winding comprises a first secondary winding and a second secondary winding, the first secondary winding passes the same current as the primary winding, the second secondary winding passes the opposite current as the primary winding, a portion of the first secondary winding is disposed on one of the outermost layers, a portion of the second secondary winding is disposed on a second outer layer adjacent to the outermost layer, a portion of the primary winding is disposed on an inner layer adjacent to the second outer layer, and the number of coils of the primary winding disposed on the inner layer is the same as the number of coils of the secondary winding on the outermost layer; the other part of the first secondary winding is arranged on the other outermost layer, the other part of the second secondary winding is arranged on a secondary outer layer adjacent to the outermost layer, the other part of the primary winding is arranged on an inner layer adjacent to the secondary outer layer, and the number of the primary windings arranged on the inner layer is the same as that of the secondary windings on the outermost layer.
5. The multilayer plate transformer according to claim 1, wherein the secondary winding comprises a first secondary winding and a second secondary winding, the first secondary winding passes the same current as the primary winding, the second secondary winding passes the opposite current as the primary winding, a portion of the first secondary winding is disposed on one of the outermost layers, a portion of the second secondary winding is disposed on a second outer layer adjacent to the outermost layer, a portion of the primary winding is disposed on an inner layer adjacent to the second outer layer, and the number of coils of the primary winding disposed on the inner layer is the same as the number of coils of the secondary winding on the outermost layer; the other part of the second secondary winding is arranged on the other outermost layer, the other part of the first secondary winding is arranged on a secondary outer layer adjacent to the outermost layer, the other part of the primary winding is arranged on an inner layer adjacent to the secondary outer layer, and the number of the primary windings arranged on the inner layer is the same as that of the secondary windings on the outermost layer.
6. The multilayer board transformer according to claim 1, wherein the sum of the coil widths of the primary windings adjacent to the secondary windings is not less than the sum of the coil widths of the secondary windings.
7. The multilayer board transformer according to claims 1-6, wherein, for use in a series resonant circuit, the primary winding of the multilayer board transformer is in series with an inductor and a capacitor and resonates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111517839.9A CN113972057A (en) | 2021-12-13 | 2021-12-13 | Multi-layer board transformer for series resonance circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111517839.9A CN113972057A (en) | 2021-12-13 | 2021-12-13 | Multi-layer board transformer for series resonance circuit |
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| Publication Number | Publication Date |
|---|---|
| CN113972057A true CN113972057A (en) | 2022-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111517839.9A Pending CN113972057A (en) | 2021-12-13 | 2021-12-13 | Multi-layer board transformer for series resonance circuit |
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| CN (1) | CN113972057A (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070030659A1 (en) * | 2003-09-29 | 2007-02-08 | Yukiharu Suzuki | Multilayer laminated circuit board |
| CN101017730A (en) * | 2006-02-08 | 2007-08-15 | 台达电子工业股份有限公司 | Transformer structure |
| CN102801302A (en) * | 2011-05-24 | 2012-11-28 | 浙江海洋学院 | Method for reducing noise by wrapping and shielding with inductance coil |
| CN106057431A (en) * | 2016-02-16 | 2016-10-26 | 中兴通讯股份有限公司 | Magnetic integrated device and power conversion circuit |
| CN108122664A (en) * | 2018-02-08 | 2018-06-05 | 东南大学 | Matrix transformer is adjusted in the turn ratio that a kind of synchronous rectifier integrates |
| CN208045288U (en) * | 2018-04-09 | 2018-11-02 | 台达电子企业管理（上海）有限公司 | Transformer |
| CN211719418U (en) * | 2020-04-13 | 2020-10-20 | 苏州英威腾电力电子有限公司 | High power density planar transformer |
| CN211788553U (en) * | 2019-11-08 | 2020-10-27 | 深圳市航嘉驰源电气股份有限公司 | Planar transformer and power converter |
| CN111883344A (en) * | 2020-03-23 | 2020-11-03 | 深圳市航嘉驰源电气股份有限公司 | Planar transformer and power converter and circuit board with same |
| CN111902895A (en) * | 2018-08-06 | 2020-11-06 | 谷歌有限责任公司 | Shielded power transformer |
| CN112992493A (en) * | 2019-12-16 | 2021-06-18 | 上海航空电器有限公司 | Cross winding planar transformer structure |
-
2021
- 2021-12-13 CN CN202111517839.9A patent/CN113972057A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070030659A1 (en) * | 2003-09-29 | 2007-02-08 | Yukiharu Suzuki | Multilayer laminated circuit board |
| CN101017730A (en) * | 2006-02-08 | 2007-08-15 | 台达电子工业股份有限公司 | Transformer structure |
| CN102801302A (en) * | 2011-05-24 | 2012-11-28 | 浙江海洋学院 | Method for reducing noise by wrapping and shielding with inductance coil |
| CN106057431A (en) * | 2016-02-16 | 2016-10-26 | 中兴通讯股份有限公司 | Magnetic integrated device and power conversion circuit |
| CN108122664A (en) * | 2018-02-08 | 2018-06-05 | 东南大学 | Matrix transformer is adjusted in the turn ratio that a kind of synchronous rectifier integrates |
| CN208045288U (en) * | 2018-04-09 | 2018-11-02 | 台达电子企业管理（上海）有限公司 | Transformer |
| CN111902895A (en) * | 2018-08-06 | 2020-11-06 | 谷歌有限责任公司 | Shielded power transformer |
| CN211788553U (en) * | 2019-11-08 | 2020-10-27 | 深圳市航嘉驰源电气股份有限公司 | Planar transformer and power converter |
| CN112992493A (en) * | 2019-12-16 | 2021-06-18 | 上海航空电器有限公司 | Cross winding planar transformer structure |
| CN111883344A (en) * | 2020-03-23 | 2020-11-03 | 深圳市航嘉驰源电气股份有限公司 | Planar transformer and power converter and circuit board with same |
| CN211719418U (en) * | 2020-04-13 | 2020-10-20 | 苏州英威腾电力电子有限公司 | High power density planar transformer |
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