CN105590735A - Planar transformer - Google Patents
Planar transformer Download PDFInfo
- Publication number
- CN105590735A CN105590735A CN201610143040.0A CN201610143040A CN105590735A CN 105590735 A CN105590735 A CN 105590735A CN 201610143040 A CN201610143040 A CN 201610143040A CN 105590735 A CN105590735 A CN 105590735A
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- Prior art keywords
- coil
- coils
- flat surface
- magnetic core
- flat
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Classifications
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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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2871—Pancake coils
-
- 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
- H01F2027/2819—Planar transformers with printed windings, e.g. surrounded by two cores and to be mounted on printed circuit
-
- 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
- H01F27/2847—Sheets; Strips
- H01F2027/2857—Coil formed from wound foil conductor
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Or Transformers For Communication (AREA)
- Coils Of Transformers For General Uses (AREA)
Abstract
The invention discloses a planar transformer. The planar transformer comprises an upper magnetic core, a lower magnetic core and multiple flat coils arranged between the upper magnetic core and the lower magnetic core. The adjacent flat coils are insulated. Each flat coil is formed by multiple turns of metal conductors coiled into a spiral shape. The flat coils are vertically projected in space and overlapped vertically. Some flat coils form primary windings of the planar transformer, and the other flat coils form secondary windings of the planar transformer. The planar transformer is characterized in that according to the direction from the center to the outer side of each flat coil, the widths of the turns of each flat coil change as the following form: W1:W2:...:Wn=1:a:...:a(n-1), W represents the widths of the coils, n represents the number of turns of the coils and is larger than or equal to 1, a is larger than or equal to 0.5 and smaller than 1 or a is larger than 1 and smaller than or equal to 1.5, and the widths of the turns of each flat coil change consistently. Magnetic field distribution of the transformer can be changed by changing the widths of the turns of each coil, so that coupling performance and the alternating current loss are changed. The planer transformer has the advantage that leakage inductance and alternating current resistance of the planer transformer can be adjusted according to the actual needs.
Description
Technical field
The present invention relates to field transformer, more specifically, relate to a kind of flat surface transformer.
Background technology
In recent years, power electronic equipment is constantly towards more small size, more high power density and more high efficiency future development,Transformer, as one of key element in power electronic equipment, also trends towards Miniaturization Design, traditional coiling transformerCan not meet the demands already. Traditional transformer complex process and have the problem that leakage inductance is large, cost is high, is difficult to meet at presentExisting market demand.
The width of all coils of above printing as the PCB of Transformer Winding routinely, is the same.
Summary of the invention
For above defect or the Improvement requirement of prior art, the invention provides a kind of flat surface transformer, it is intended to solveIn prior art, can not adjust by actual demand the technical problem of leakage inductance and AC resistance.
For achieving the above object, by the invention provides a kind of flat surface transformer, comprise magnetic core, lower magnetic core and settingMultiple flatwise coils between described upper and lower magnetic core, insulate between adjacent flat coil, described each flatwise coil be byMultiturn is coiled into spiral-shaped metallic conductor and forms, spatially upright projection of described multiple flatwise coils, and heavy up and downFolded, described multiple flatwise coil parts form the armature winding of flat surface transformer, another part formation flat surface transformerSecondary windings, is characterized in that: every circle coil width of described each flatwise coil is according to the outside side of each hub of a spoolTo, to change as following form:
W1：W2：…：Wn＝1：a：…：an-1, W is coil width, n is coil turn, n >=1,0.5≤ a < 1 or 1 < a≤1.5, the change trend of every circle coil width of described each flatwise coil is consistent with each other.
Preferably, between every two coils of described armature winding, the number of turn differs and is less than or equal to 1, described secondary windings every twoBetween individual coil, the number of turn differs and is less than or equal to 1.
Preferably, described flatwise coil is multilayer printed circuit board or copper bar or copper sheet or both combinations or three's combination.
Preferably, in the time that flatwise coil is multilayer printed circuit board, described each flatwise coil is to adopt Copper Foil wire-wound system,And be the every one deck that is embedded in described multilayer printed circuit board.
Preferably, the spacing of the adjacent two circle coils of described each coil meets lg Δ t=0.78*lg (V/300); Δ t is everySpacing between the adjacent two circle coils of individual flatwise coil, V is actual use voltage.
By technical scheme of the present invention, can improve magnetic Field Coupling on the one hand, reduce leakage inductance, reduce to exchange simultaneously and damageConsumption, reduces AC resistance, on the other hand also can the user demand to transformer according to reality, reduce magnetic Field Coupling,Increase leakage inductance. Meanwhile, adopt multilayer printed circuit board as the flat surface transformer of winding compared with tradition coiling transformer,Have good high frequency characteristics, good insulation preformance, dispels the heat good, the coupling between winding well, no matter cost, volume weight,Aspect of performance is all more won and one is raised. In addition, use copper sheet to substitute printed circuit board and can also improve through-current capability.
In general, can change the Distribution of Magnetic Field of transformer by changing every circle coil width, thereby change coupling performanceAnd A.C.power loss, the present invention has and can adjust the leakage inductance of flat surface transformer and the feature of AC resistance according to actual demand.
Brief description of the drawings
Fig. 1 is according to the signal exploded view of the flat surface transformer structure of embodiments of the invention one;
Fig. 2 provides on the multilayer printed circuit board structure of winding according to the flat surface transformer that is used to of embodiments of the invention oneThe view that coil width increases progressively;
Fig. 3 provides on the multilayer printed circuit board structure of winding according to the flat surface transformer that is used to of embodiments of the invention oneThe view that coil width successively decreases;
Fig. 4 be according to embodiments of the invention and the flat surface transformer that is used to provide coil width on the copper sheet structure of winding to passThe view increasing.
In institute's drawings attached, identical Reference numeral is used for representing identical element or structure, wherein: 1-magnetic core, 11-Upper magnetic core, magnetic core under 12-, 2-multilayer printed circuit board, 21,22,23,24,25,26-track, 27,28,29,20,31-through hole, 3-copper sheet.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, rightThe present invention is further elaborated. Should be appreciated that specific embodiment described herein is only in order to explain the present invention,Be not intended to limit the present invention. In addition involved technical characterictic in each embodiment of described the present invention,As long as not forming each other conflict just can combine mutually.
Embodiment mono-
As shown in Figure 1, the flat surface transformer of the present embodiment comprises magnetic core, lower magnetic core and is arranged between upper and lower magnetic coreBe used to flat surface transformer that the multilayer printed circuit board 2 of winding is provided, the magnetic core 1 that the present embodiment provides comprises magnetic core 11With lower magnetic core 12, respectively in the above and below of multilayer printed circuit board 2. Upper magnetic core 11 and lower magnetic core 12 are a pair of EE typesPlanar magnetic core, can also be other magnetic core, such as EI magnetic core, and ER magnetic core etc. The present embodiment is with every layer of coil, everyIndividual coil three circles are example, and as shown in Figure 2, the track 21,22,23 on every one deck of multilayer printed circuit board 2 provides and enclosesAround a coil of magnetic core 1 core, coil adopts Copper Foil line to print, and track is flat pattern. Multilayered printed electricityBetween the armature winding that road plate 2 provides and secondary windings, there is default ratio of winding.
As shown in Figure 2, the coil that the track 21,22,23 on wherein one deck of multilayer printed circuit board 2 formsThe width of every circle coil is followed successively by W1、W2、W3, the width W of track 21,22,231、W2、W3Pass be:
W1：W2：W3＝1：a：a2(formula I)
This seasonal W1=x,, W2=xa, W3=xa2, when Design of Transformer, a wherein side of multilayer printed circuit board 2Width b1 determines by magnetic core window width, and for example EE type planar magnetic core one side window width is how many, multilayer printed circuitA wherein side width b1 of plate 2 is just how many. Between multilayer printed circuit board 2 every layer of upper adjacent two circle flatwise coilSeparation delta t1, every layer of circle coil interior is g near the spacing of printed circuit board 2 center windows1, outermost turn coil is near printingThe spacing at circuit board processed 2 edges is g2, in this example, design and control for convenient, between adjacent two circle flatwise coilsSeparation delta t1 arrange equally, interior circle coil is g near the spacing of printed circuit board 2 center windows1With outermost turn lineCircle is near the spacing g at printed circuit board 2 edges2Arrange also and equate.
Routinely, the separation delta t between adjacent two circle coils1, interior circle coil is near printed circuit board 2 center windowsSpacing is g1With the spacing g of outermost turn coil near printed circuit board 2 edges2All to be determined by electric parameter, as through-flowIntensity, dielectric strength, as long as these two parameters meet insulating requirements conventionally, generally according to dielectric strength setting spaceMinimum, to increase coil width as far as possible, improves negotiability, when spacing arranges when unequal, while considering dielectric strength, wantsDesign according to minimum spacing distance, be inconvenient to design and control, totally do not calculate. Generally every in engineering realitySeparation delta t on layer between adjacent two circle coils meets lg Δ t=0.78*lg (V/300), and V is actual use voltage.
Now, (W1+W2+W3)+2Δt1+2g1＝b1
I.e. (x+xa+xa2)+2Δt1+2g1＝b1
x＝(b1-2Δt1-2g1)/(1+a+a2)
Therefore, W1＝(b1-2Δt1-2g1)/(1+a+a2)
W2＝(b1-2Δt1-2g1)/(1+a+a2)a
W3＝(b1-2Δt1-2g1)/(1+a+a2)a2
Therefore under normal conditions, every circle coil width is that the magnetic core window width using according to reality determines.
Meet formula I, when the span of a is 1 to 1.5, and a is not 1 o'clock, W1、W2、W3Width according to coilCentral side is direction laterally, and coil width increases progressively, compared with conventional flat surface transformer, and the more close core center of Distribution of Magnetic FieldSide, magnetic Field Coupling performance is further enhanced, thereby has reduced leakage inductance, has reduced A.C.power loss simultaneously, has reduced friendshipLeakage resistance. Ratio a value difference, varies in size on the impact of flat surface transformer performance, when transformer has been determined, and canAdjust the concrete value of a according to real needs. Now multilayer printed circuit board 2 often connects by through hole 28 between layer by layerConnect, in the time having polylith multilayer printed circuit board, between adjacent two, connect by through hole 27.
Similarly, as shown in Figure 3, the track 24,25,26 on wherein one deck of multilayer printed circuit board 2 formsThe width of three circle coils is followed successively by W4，W5，W6, the width W of track 24,25,264，W5，W6'sPass is:
W4：W5：W6＝1：a：a2(formula II)
Now, the span of ratio a is 0.5 to 1, and a is not 1 o'clock, W4，W5，W6Width according toHub of a spool side direction lateral direction, coil width successively decreases, and compared with conventional flat surface transformer, Distribution of Magnetic Field is further from magnetic coreCentral side, magnetic Field Coupling performance is reduced, thereby has increased leakage inductance. For example, in DC/DC converter, plane becomesThe leakage inductance of depressor can participate in circuit resonance, realizes mosfet switch tube zero voltage and turns on and off. So just require planeThe leakage inductance of transformer and the stray capacitance of mosfet match, and have a concrete determined value, such as are 1 μ H. ?After usual manner Design of Transformer, discovery leakage inductance only has 0.85 μ H, at this time just need to increase a little leakage inductance,And other modes (such as changing the arrangement mode of winding) are larger on the impact of leakage inductance, slightly adjusting leakage inductance value will be inclined to one sideBe difficult to realize tiny adjustment greatly. Adopt this method in the present invention, just can realize and increase a little leakage inductance value like thisAn object. Therefore, ratio a value difference, varies in size on the impact of flat surface transformer performance, can be according to realitySituation demand is adjusted the concrete value of a. Now multilayer printed circuit board 2 often connects by through hole 20 between layer by layer,In the time having polylith multilayer printed circuit board, between adjacent two, connect by through hole 29.
For same flat surface transformer, every one deck reach the standard grade circle width change trend be consistent, be all increase progressively or withFor successively decreasing; Every one deck reach the standard grade circle width change ratio a can be inconsistent, meet span require.
Similarly, in the time that the coil of multilayer printed circuit board 2 every layer of track formation is any multiturn, according to hub of a spoolOutwards, the width of every circle coil is set, makes it meet following form and change:
W1：W2：…：Wn＝1：a：…：an-1W is coil width, and n is coil turn, n>=1,0.5≤a <, 1 or 1 < a≤1.5
For coil turn, the number of turn is all positive integer, is all generally to set according to the requirement of concrete transformer, firstDetermine primary winding and secondary windings ratio, then the number of turn is set. For each coil turn, every two of armature windingBetween coil, the number of turn differs and is less than or equal to 1, and between every two coils of secondary windings, the number of turn differs and is less than or equal to 1, like thisMagnetic field distributes just more even relatively.
According to the present embodiment, by the width of track on multilayer printed circuit board 2 is set, can change electromagnetic coupledCan and A.C.power loss, thereby change leakage inductance and the AC resistance of flat surface transformer, reach the object of practical requirement.
Embodiment bis-
As shown in Figure 4, in this example, the multilayer printed circuit board in example one is used instead to multiple copper sheets and substituted, each copper sheetOn coil still as in embodiment mono-, print, except other copper conductor parts of coiler part adopt punching press or other modesRemove. While adopting copper sheet to substitute multilayer printed circuit board, be equivalent to retain the Copper Foil line on multilayer printed circuit board, goneFall substrate, improved through-current capability. Between multiple copper sheets, connect by through hole 31. Between adjacent copper sheet, needInsulating materials is set to insulate.
On the basis of embodiment mono-, can adopt copper sheet 3 to replace some or all of multilayer printed circuit board 2, simultaneouslyMake to there is default ratio of winding between armature winding and secondary windings, between copper sheet 3 and printed circuit board 2, can pass throughThrough hole 31,27,29 connects. In some cases, if copper sheet is improper, also can adopt copper bar to replace,As long as meet the default ratio of winding of transformer.
Those skilled in the art will readily understand, the foregoing is only preferred embodiment of the present invention, not in order to limitThe present invention processed, all any amendments of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should wrapWithin being contained in protection scope of the present invention.
Claims (5)
1. a flat surface transformer, comprises magnetic core, lower magnetic core and is arranged on the multiple flat wires between described upper and lower magnetic coreCircle, insulate between adjacent flat coil, and described each flatwise coil is to be coiled into spiral-shaped metallic conductor structure by multiturnBecome, spatially upright projection of described multiple flatwise coils, and overlapping up and down, described multiple flatwise coil parts formThe armature winding of flat surface transformer, another part forms the secondary windings of flat surface transformer, it is characterized in that: described eachEvery circle coil width of flatwise coil is according to each hub of a spool direction laterally, to change as following form:
W1：W2：…：Wn＝1：a：…：an-1, W is coil width, n is coil turn, n >=1,0.5≤ a < 1 or 1 < a≤1.5, the change trend of every circle coil width of described each flatwise coil is consistent with each other.
2. flat surface transformer according to claim 1, is characterized in that, the number of turn between every two coils of described armature windingDiffer and be less than or equal to 1, between every two coils of described secondary windings, the number of turn differs and is less than or equal to 1.
3. flat surface transformer according to claim 1 and 2, is characterized in that, described flatwise coil is multilayer printed circuitPlate or copper bar or copper sheet or both combinations or three's combination.
4. flat surface transformer according to claim 3, is characterized in that, in the time that flatwise coil is multilayer printed circuit board,Described each flatwise coil is to adopt Copper Foil wire-wound system, and is the every one deck that is embedded in described multilayer printed circuit board.
5. flat surface transformer according to claim 3, is characterized in that, between the adjacent two circle coils of described each coilApart from meeting lg Δ t=0.78*lg (V/300); Δ t is the spacing between the adjacent two circle coils of each flatwise coil, and V is actualUse voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610143040.0A CN105590735B (en) | 2016-03-14 | 2016-03-14 | A kind of flat surface transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610143040.0A CN105590735B (en) | 2016-03-14 | 2016-03-14 | A kind of flat surface transformer |
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| Publication Number | Publication Date |
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| CN105590735A true CN105590735A (en) | 2016-05-18 |
| CN105590735B CN105590735B (en) | 2018-09-07 |
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| CN201610143040.0A Active CN105590735B (en) | 2016-03-14 | 2016-03-14 | A kind of flat surface transformer |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105761881A (en) * | 2016-05-20 | 2016-07-13 | 浙江求缺科技有限公司 | Planar winding coil for double-column magnetic core structure |
| CN106373733A (en) * | 2016-10-31 | 2017-02-01 | 广安鑫宇电子有限公司 | Adjustable planar transformer and manufacturing method therefor |
| US20200350111A1 (en) * | 2019-04-30 | 2020-11-05 | Rockwell Automation Technologies, Inc. | System and Method for Reducing Power Losses for Magnetics Integrated in a Printed Circuit Board |
| CN112752401A (en) * | 2019-10-29 | 2021-05-04 | 汕头凯星印制板有限公司 | Printed circuit board type multipoint variable inductance coil and manufacturing method thereof |
| CN113421756A (en) * | 2021-06-23 | 2021-09-21 | 北京航空航天大学 | High-frequency high-power multi-magnetic-core combined planar transformer |
| CN114121442A (en) * | 2021-11-05 | 2022-03-01 | 西安交通大学 | Low-alternating-current copper loss planar magnetic part winding for power electronic converter |
| CN114724843A (en) * | 2021-01-05 | 2022-07-08 | 广州视源电子科技股份有限公司 | Transformer winding preparation method and device and planar transformer |
| CN114724846A (en) * | 2021-01-05 | 2022-07-08 | 广州视源电子科技股份有限公司 | Transformer winding preparation method and device and planar transformer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05226155A (en) * | 1992-02-18 | 1993-09-03 | Nippon Telegr & Teleph Corp <Ntt> | Planar structure transformer and inductor coil |
| CN101719415A (en) * | 2009-12-30 | 2010-06-02 | 华东师范大学 | Plane spiral inductor |
| CN104103636A (en) * | 2014-07-07 | 2014-10-15 | 武汉芯泰科技有限公司 | On-chip transformer |
| CN205487673U (en) * | 2016-03-14 | 2016-08-17 | 饶波 | Planar transformer |
-
2016
- 2016-03-14 CN CN201610143040.0A patent/CN105590735B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05226155A (en) * | 1992-02-18 | 1993-09-03 | Nippon Telegr & Teleph Corp <Ntt> | Planar structure transformer and inductor coil |
| CN101719415A (en) * | 2009-12-30 | 2010-06-02 | 华东师范大学 | Plane spiral inductor |
| CN104103636A (en) * | 2014-07-07 | 2014-10-15 | 武汉芯泰科技有限公司 | On-chip transformer |
| CN205487673U (en) * | 2016-03-14 | 2016-08-17 | 饶波 | Planar transformer |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105761881A (en) * | 2016-05-20 | 2016-07-13 | 浙江求缺科技有限公司 | Planar winding coil for double-column magnetic core structure |
| CN106373733A (en) * | 2016-10-31 | 2017-02-01 | 广安鑫宇电子有限公司 | Adjustable planar transformer and manufacturing method therefor |
| CN106373733B (en) * | 2016-10-31 | 2017-11-14 | 广安鑫宇电子有限公司 | A kind of adjustable flat surface transformer and its manufacture method |
| US20200350111A1 (en) * | 2019-04-30 | 2020-11-05 | Rockwell Automation Technologies, Inc. | System and Method for Reducing Power Losses for Magnetics Integrated in a Printed Circuit Board |
| CN112752401A (en) * | 2019-10-29 | 2021-05-04 | 汕头凯星印制板有限公司 | Printed circuit board type multipoint variable inductance coil and manufacturing method thereof |
| CN112752401B (en) * | 2019-10-29 | 2023-12-12 | 汕头凯星印制板有限公司 | Printed circuit board type multipoint variable inductance coil and manufacturing method thereof |
| CN114724843A (en) * | 2021-01-05 | 2022-07-08 | 广州视源电子科技股份有限公司 | Transformer winding preparation method and device and planar transformer |
| CN114724846A (en) * | 2021-01-05 | 2022-07-08 | 广州视源电子科技股份有限公司 | Transformer winding preparation method and device and planar transformer |
| CN113421756A (en) * | 2021-06-23 | 2021-09-21 | 北京航空航天大学 | High-frequency high-power multi-magnetic-core combined planar transformer |
| CN114121442A (en) * | 2021-11-05 | 2022-03-01 | 西安交通大学 | Low-alternating-current copper loss planar magnetic part winding for power electronic converter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105590735B (en) | 2018-09-07 |
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Effective date of registration: 20210210 Address after: No.25, Xianxing Road, Xianlin street, Yuhang District, Hangzhou City, Zhejiang Province Patentee after: Hangzhou Bozhou Electric Appliance Co.,Ltd. Address before: 430074 room 218, East 15th floor, 1037 Luoyu Road, Hongshan District, Wuhan City, Hubei Province Patentee before: Rao Bo |