CN105590735B - A kind of flat surface transformer - Google Patents
A kind of flat surface transformer Download PDFInfo
- Publication number
- CN105590735B CN105590735B CN201610143040.0A CN201610143040A CN105590735B CN 105590735 B CN105590735 B CN 105590735B CN 201610143040 A CN201610143040 A CN 201610143040A CN 105590735 B CN105590735 B CN 105590735B
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- Prior art keywords
- coil
- flatwise
- flat surface
- magnetic core
- printed circuit
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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 kind of flat surface transformers, including upper magnetic core, lower magnetic core and the multiple flatwise coils being arranged between the magnetic core up and down, it insulate between adjacent flat coil, each flatwise coil is to coil helically shaped metallic conductor by multiturn to constitute, the multiple flatwise coil spatially upright projection, and overlapping up and down, the armature winding of the multiple flatwise coil part composition flat surface transformer, another part constitutes the secondary windings of flat surface transformer, it is characterised in that：Every circle width of each flatwise coil in outward direction, is changed according to each hub of a spool with such as following form：W1：W2：……：Wn=1：a：…：an‑1, W is coil width, and n is coil turn, n >=1,0.5≤a ＜ 1 or 1 a≤1.5 ＜, and the change trend of every circle coil width of each flatwise coil is consistent with each other.The Distribution of Magnetic Field that transformer can be changed per circle coil width by changing, to change coupling performance and A.C.power loss, the present invention has the characteristics that the leakage inductance and AC resistance of flat surface transformer can be adjusted according to actual demand.
Description
Technical field
The present invention relates to field transformers, more particularly, to a kind of flat surface transformer.
Background technology
In recent years, power electronic equipment constantly develops towards the direction of smaller volume, higher power density and higher efficiency,
Transformer also tends to Miniaturization Design as one of the key element in power electronic equipment, traditional around line transformer morning
Have been unable to meet requirement.Traditional transformer complex process and there is a problem of that leakage inductance is big, it is of high cost, it is difficult to meet existing city at present
Field demand.
Routinely, the width as all coils printed on the PCB of transformer winding is the same.
Invention content
For the disadvantages described above or Improvement requirement of the prior art, the present invention provides a kind of flat surface transformer, it is intended to solve
The technical issues of certainly leakage inductance and AC resistance cannot be adjusted by actual demand in the prior art.
To achieve the above object, by the present invention provides a kind of flat surface transformers, including upper magnetic core, lower magnetic core and setting
It insulate between multiple flatwise coils between magnetic core up and down, adjacent flat coil, each flatwise coil is by more
Circle coils helically shaped metallic conductor and constitutes, the multiple flatwise coil spatially upright projection, and overlapping up and down, institute
State the armature winding that multiple flatwise coil parts constitute flat surface transformers, another part constitute flat surface transformer it is secondary around
Group, it is characterised in that：Every circle coil width of each flatwise coil according to each hub of a spool in outward direction, with as follows
Row form changes：
W1：W2：…：Wn=1：a：…：an-1, W is coil width, and n is coil turn, n >=1,0.5≤a ＜ 1 or 1 ＜ a≤
1.5, the change trend of every circle coil width of each flatwise coil is consistent with each other.
Preferably, the number of turns difference is less than or equal to 1 between the armature winding each two coil, the secondary windings every two
The number of turns difference is less than or equal to 1 between a coil.
Preferably, the flatwise coil is multilayer printed circuit board or copper bar or copper sheet or both combination or three's combination.
Preferably, when flatwise coil is multilayer printed circuit board, each flatwise coil is to use copper foil line coiling,
And it is be embedded in the multilayer printed circuit board each layer.
Preferably, the spacing of the adjacent two circles coil of each coil meets lg Δs t=0.78*lg (V/300)；Δ t is
Spacing between the adjacent two circles coil of each flatwise coil, V are actual use voltage.
On the one hand technical solution through the invention can improve magnetic coupling, reduce leakage inductance, while reduce exchange damage
Consumption reduces AC resistance, on the other hand can also reduce magnetic coupling according to reality to the use demand of transformer, increase
Leakage inductance.Meanwhile using multilayer printed circuit board as winding flat surface transformer compared with tradition is around line transformer, have preferable
High frequency characteristics, good insulation preformance, heat dissipation it is good, the coupling between winding well, no matter cost, volume weight, aspect of performance all more
It wins and one raises.In addition, through-current capability can also be improved by substituting printed circuit board using copper sheet.
In general, the Distribution of Magnetic Field that transformer can be changed per circle coil width by changing, to change coupling
Energy and A.C.power loss, the present invention have the characteristics that the leakage inductance and AC resistance of flat surface transformer can be adjusted according to actual demand.
Description of the drawings
Fig. 1 is the signal exploded view of according to an embodiment of the invention one flat surface transformer construction；
Fig. 2 is the according to an embodiment of the invention one multilayer printed circuit board structure for providing winding for flat surface transformer
The incremental view of coil width；
Fig. 3 is the according to an embodiment of the invention one multilayer printed circuit board structure for providing winding for flat surface transformer
The view that coil width successively decreases；
Fig. 4 be according to an embodiment of the invention and for providing the copper sheet structure coil width of winding for flat surface transformer
Incremental view.
In all the appended drawings, identical reference numeral is used for indicating identical element or structure, wherein：1- magnetic cores, on 11-
Magnetic core, magnetic core under 12-, 2- multilayer printed circuit boards, 21,22,23,24,25,26- tracks, 27,28,29,20,31- through-holes,
3- copper sheets.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
It does not constitute a conflict with each other and can be combined with each other.
Embodiment one
As shown in Figure 1, the flat surface transformer of the present embodiment includes upper magnetic core, lower magnetic core and is arranged between upper and lower magnetic core
Multilayer printed circuit board 2 for providing winding for flat surface transformer, magnetic core 1 provided in this embodiment include upper magnetic core 11 under
Magnetic core 12, respectively above and below multilayer printed circuit board 2.Upper magnetic core 11 and lower magnetic core 12 are a pair of of EE types planar magnetics
Core can also be other magnetic cores, such as EI magnetic cores, ER magnetic cores etc..The present embodiment is with every layer of coil, three circle of each coil
Example, as shown in Fig. 2, the track 21,22,23 on each layer of multilayer printed circuit board 2 is provided around 1 central part of magnetic core
One coil, coil are printed using copper foil line, and track is flat pattern.Multilayer printed circuit board 2 provide armature winding and
There is preset ratio of winding between secondary windings.
As shown in Fig. 2, the coil that the track 21,22,23 on wherein one layer of multilayer printed circuit board 2 is formed is every
The width of circle coil is followed successively by W1、W2、W3, the width W of track 21,22,231、W2、W3Relationship be：
W1：W2：W3=1：a：a2(formula I)
This season W1=x, then W2=xa, W3=x a2, when Design of Transformer, the wherein side of multilayer printed circuit board 2
Width b1 determines by magnetic core window width, for example, EE type planar magnetic cores side window width be it is how many, multilayer printed circuit board 2
Wherein side width b1 is just how many.Separation delta t1 between the upper adjacent two circles flatwise coil of every layer of multilayer printed circuit board 2, often
The most interior circle coil of layer is g close to the spacing of 2 center window of printed circuit board1, outermost turn coil is close to 2 edge of printed circuit board
Spacing is g2, it designs and controls for convenience in this example, the separation delta t1 settings between adjacent two circles flatwise coil is equal,
Most interior circle coil is g close to the spacing of 2 center window of printed circuit board1With outermost turn coil close to 2 edge of printed circuit board
Spacing g2Setting is also equal.
Routinely, the separation delta t between adjacent two circles coil1, most interior circle coil is close to 2 center window of printed circuit board
Spacing is g1With outermost turn coil close to the spacing g at 2 edge of printed circuit board2All it is to be determined by electric parameter, such as through-flow intensity,
Dielectric strength, it is minimum generally according to dielectric strength setting spacing as long as usually the two parameters meet insulating requirements, with to the greatest extent
Amount increase coil width, improve negotiability, when spacing setting it is unequal when, consider dielectric strength when will according to minimum spacing away from
From designing, it has not been convenient to design and control, it is generally cost-effective.Generally engineering in practice every layer of upper adjacent two circles coil it
Between separation delta t meet lg Δs t=0.78*lg (V/300), V is actual use voltage.
At this point, (W1+W2+W3)+2Δt1+2g1=b1
That is (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 in general, per circle coil width determined according to the magnetic core window width of actual use.
Formula I is met, when the value range of a is 1 to 1.5, and a is not 1, W1、W2、W3Width according to hub of a spool side
In outward direction, coil width is incremental, and compared with conventional plane transformer, Distribution of Magnetic Field is closer to core center side, magnetic field coupling
It closes performance to be further enhanced, to reduce leakage inductance, while reducing A.C.power loss, reduce AC resistance.Ratio a takes
Value is different, and the influence to flat surface transformer performance is of different sizes, when transformer determines, can adjust a's according to specific requirements
Specific value.Multilayer printed circuit board 2 is by through-hole 28 per being attached between layer by layer at this time, when there is polylith multilayer printed circuit
When plate, connected by through-hole 27 between adjacent two pieces.
Similarly, as shown in figure 3, track 24,25,26 on wherein one layer of multilayer printed circuit board 2 formed three
The width of circle coil is followed successively by W4, W5, W6, the width W of track 24,25,264, W5, W6Relationship be：
W4：W5：W6=1：a：a2(formula II)
At this point, the value range of ratio a be 0.5 to 1, and a be 1 when, W4, W5, W6Width it is lateral according to hub of a spool
Lateral direction, coil width successively decrease, and compared with conventional plane transformer, Distribution of Magnetic Field is further from core center side, magnetic coupling
Performance is reduced, to increase leakage inductance.For example, in DC/DC converters, it is humorous that the leakage inductance of flat surface transformer can participate in circuit
It shakes, realizes that mosfet switch tube zero voltages turn on and off.This requires that flat surface transformer leakage inductance and mosfet it is spuious
Capacitance matches, and to determine value there are one specific, for example 1 μ H.After with usual manner Design of Transformer, leakage is found
Sense only has 0.85 μ H, at this time just needs to increase a little leakage inductance, and other modes (for example changing the arrangement mode of winding) are right
The influence of leakage inductance is bigger, and slightly adjusting leakage inductance value will be bigger than normal, it is difficult to realize tiny adjustment.Using this in the present invention
Method, so that it may slightly increase such a purpose of leakage inductance value to realize.Therefore, ratio a values are different, to flat surface transformer performance
Influence it is of different sizes, can according to actual conditions demand adjust a specific value.Multilayer printed circuit board 2 is per layer by layer at this time
Between be attached by through-hole 20, when there is polylith multilayer printed circuit board, connected by through-hole 29 between adjacent two pieces.
For approximately the same plane transformer, each layer of coil width change trend be consistent, be all be incremented by or
It is all to successively decrease；The ratio a that each layer of coil width changes can be inconsistent, meets value range requirement.
Similarly, when the coil that the every layer of track of multilayer printed circuit board 2 is formed is arbitrary multiturn, according to hub of a spool
Outward, the width per circle coil is set, so that it is met following form and changes：
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 turns is all positive integer, is typically set according to the requirement of specific transformer, first
It determines primary winding and secondary windings ratio, then the number of turns is set.For each coil turn, armature winding each two coil
Between the number of turns difference be less than or equal to 1, the number of turns difference is less than or equal to 1 between secondary windings each two coil, such magnetic field phase
To being distributed just evenly.
According to the present embodiment, by the width that track on multilayer printed circuit board 2 is arranged, thus it is possible to vary electromagnetic coupling
Energy and A.C.power loss achieve the purpose that meet actual demand to change the leakage inductance and AC resistance of flat surface transformer.
Embodiment two
It is substituted as shown in figure 4, using the multilayer printed circuit board in example one instead multiple copper sheets in this example, each copper sheet
On coil still printed as in embodiment one, except other copper conductor parts of coiler part are gone using punching press or other modes
It removes.When substituting multilayer printed circuit board using copper sheet, it is equivalent to the copper foil line remained on multilayer printed circuit board, eliminates base
Plate improves through-current capability.Between multiple copper sheets, it is attached by through-hole 31.It needs that insulation material is arranged between adjacent copper sheet
Material insulate.
On the basis of embodiment one, copper sheet 3 may be used and replace some or all of multilayer printed circuit board 2, simultaneously
So that having preset ratio of winding between armature winding and secondary windings, through-hole can be passed through between copper sheet 3 and printed circuit board 2
31, it 27,29 is attached.In some cases, if copper sheet is improper, copper bar can also be used to replace, as long as meeting transformation
Device presets ratio of winding.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all within the spirits and principles of the present invention made by all any modification, equivalent and improvement etc., should all include
Within protection scope of the present invention.
Claims (3)
1. a kind of flat surface transformer, including upper magnetic core, lower magnetic core and the multiple flat wires being arranged between the upper and lower magnetic core
It enclosing, insulate between adjacent flat coil, each flatwise coil is to coil helically shaped metallic conductor by multiturn to constitute,
The multiple flatwise coil spatially upright projection, and overlapping up and down, a multiple flatwise coil part constitute plane and become
The armature winding of depressor, another part constitute the secondary windings of flat surface transformer, it is characterised in that：Armature winding and secondary windings
Between have preset ratio of winding；Every circle coil width of each flatwise coil is according to the outside side of each hub of a spool
To with the change of such as following form：
W1：W2：…：Wn=1：a：…：an-1, W is coil width, and n is coil turn, n≤1,0.5≤a ﹤ 1 or 1 a≤1.5 ﹤, institute
The change trend for stating every circle coil width of each flatwise coil is consistent with each other；The flatwise coil be multilayer printed circuit board or
Copper bar or copper sheet or both combination or three's combination；The spacing of the adjacent two circles coil of each coil meets lg △ t=0.78*lg
(V/300)；△ t are the spacing between the adjacent two circles coil of each flatwise coil, and V is actual use voltage；
When flatwise coil uses multilayer printed circuit board, the track on each layer of multilayer printed circuit board is provided around by upper
One coil of the core center part that magnetic core, lower magnetic core are constituted.
2. flat surface transformer according to claim 1, which is characterized in that the number of turns between the armature winding each two coil
Difference is less than or equal to 1, and the number of turns difference is less than or equal to 1 between the secondary windings each two coil.
3. flat surface transformer according to claim 1 or 2, which is characterized in that when flatwise coil is multilayer printed circuit board
When, each flatwise coil is to use copper foil line coiling, and is embedded in each layer of the multilayer printed circuit board.
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 CN105590735A (en) | 2016-05-18 |
| CN105590735B true CN105590735B (en) | 2018-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
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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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Families Citing this family (7)
| 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 |
| 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 |
| 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 |
| 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 |
Citations (4)
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|---|---|---|---|---|
| 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 |
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| CN105590735A (en) | 2016-05-18 |
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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 |
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