CN105702425A - Planar coil and planar transformer - Google Patents
Planar coil and planar transformer Download PDFInfo
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- CN105702425A CN105702425A CN201410709678.7A CN201410709678A CN105702425A CN 105702425 A CN105702425 A CN 105702425A CN 201410709678 A CN201410709678 A CN 201410709678A CN 105702425 A CN105702425 A CN 105702425A
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- coil
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- flat surface
- planar
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Abstract
The invention provides a planar coil used for a planar transformer. The planar coil comprises a first volute coil layer, a second volute coil layer and N volute coil layers for connecting the first volute coil layer and the second volute coil layer in series, wherein the coil layers are made from continuous materials; the first volute coil layer, the second volute coil layer and the N volute coil layers are overlapped, wherein N is 0 or an even number; the connecting part of any two volute coil layers is connected with the plane of the two coil layers; the first volute coil layer or the second volute coil layer also can comprise an extension connecting pad separately; and the coil of the planar transformer also can comprise insulating spacers positioned between any two volute coil layers. The invention also discloses the planar transformer employing the coil.
Description
Technical field
The present invention is the planar coil about a kind of flat surface transformer and the flat surface transformer using this coil, especially with regard to a kind of can continuous material make multilamellar, many number of turns planar coil construction。Invention additionally discloses the flat surface transformer using this planar coil。
Background technology
Transformator is the significant components that electronic product is powered。Existing volume of transformer is huge, it is impossible to meet the requirement of product miniaturization。Flat surface transformer (Planartransformer, or claim flat-plate transformer) it is at multilayer board (Printedcircuitboard, PCB) conductive foil such as Copper Foil are laid as winding, the transformator of storehouse, it is possible to be substantially reduced the thickness of transformator。Flat surface transformer is widely used in the products such as communication, computer, Industry Control, aeronautical engineering, armarium。But, because flat surface transformer needs to use the circuit board of suitable multilamellar, volume is still big。And because of inefficient, output impedance is also big, it is easy to produce noise。How to reach flat surface transformer slimming, high efficiency, become the technical barrier that the industry urgently overcomes。
Taiwan patent of invention I357086 provides a kind of transformator, is suitable to be configured in a circuit base plate。Transformator includes one first planar coil and one second planar coil, and wherein the first planar coil has several the first pitch of the laps, and the second planar coil has several the second pitch of the laps。The first pitch of the laps that at least two is adjacent constitutes the first pitch of the laps bundle。The second pitch of the laps that at least two is adjacent constitutes the second pitch of the laps bundle。Both cross over mutually, thereby reduce the number of plies of planar coil。
The open a kind of flat surface transformer of Chinese invention patent CN103081044A, has the monolayer of multilamellar, individual pen wire-wrap board, and with different wire-wrap board combinations, according to different needs, constitutes the flat surface transformer of different kenel。
The open a kind of flat surface transformer of European patent EP 2602801A1, has some monolayers, individual pen coiling metallic plate, as secondary rolling thread, to combine with primary coiling。
The open a kind of flat surface transformer of European patent EP 2637183A2, uses monolayer individual pen wire-wrap board as coil。Wire-wrap board also extends connection pad (pad) shape, using as between layer and layer, and with extraneous connection electrode。
The open a kind of flat surface transformer of U.S. Patent Publication case 2013-278371A1, uses the planar metal coiling of some monolayers, and by some metal wound wire with terminal series-shunt and location, reaches the purpose of multilayer winding。
Patent Cooperation Treaty case WO0070926A1 is open a kind of flat surface transformer also, uses continuous material to make multilamellar, individual pen wire-wrap board。Concatenate with the tongue piece of connection pad shape between each layer。
United States Patent (USP) 8,237,535B2 discloses a kind of with the overlapped flat surface transformer combined of lattice coil plate or coil layer。Each coil layer includes the coil of individual pen。
United States Patent (USP) 8,395,470B2 discloses a kind of with the overlapped flat surface transformer combined of lattice coil plate or coil layer。Each coil layer includes the coil of individual pen, mutually to be arranged in the connection pad series connection of different relative position。
The open a kind of planar high voltage transformer of U.S. Patent Publication case 2014/0145813, utilizes the overlapped combination of coil plate of multilamellar to be formed。Each coil plate all includes the coil of multi-turn。The coiling of coil arises from coil plate periphery, finally inner circumferential。
By the state of the art of flat surface transformer it can be seen that industry is for the miniaturization of flat surface transformer, it is the exploitation done one's utmost, to break away from the existing stereotype with print circuit plates making flat surface transformer。Proposed design, how with unit as combination of single-layer winding plate, coil plate or coil layer。But and one cannot be proposed according to using upper needs, by increasing and decreasing coil plate or the coil layer number of plies and winding turns, the flat surface transformer structure of transformer voltage conversion proportion can be changed。Prior art also without propose a kind of can continuous material make planar coil technology。
Summary of the invention
The purpose of the present invention is providing the planar coil framework of a kind of multilamellar, multi-turn。
Another object of the present invention, providing a kind of easily in response to the different demands on using, changes the number of plies of planar coil and the planar coil of the number of turns。
The purpose of the present invention is more providing a kind of planar coil using continuous material to make。
The purpose of the present invention is more providing a kind of flat surface transformer with above-mentioned advantage。
The coil of the flat surface transformer according to the present invention, for a kind of planar coil, and includes being formed by continuous material: the first circumvolution ring layer, the second circumvolution ring layer and both the N number of circumvolution ring layer of connecting, and this is first, second overlapped with N number of circumvolution ring layer。Wherein, N is 0 or even number。This volute has even number circle or the coiling of odd number circle。The linking part of wantonly two circumvolution ring layers connects the plane at this ring layer place, two wires。This first or second circumvolution ring layer may also include the connection pad of an extension。This planar coil may also include the insulation spacer being positioned at wantonly two volute coil interlayers。
In the example of the present invention, this volute includes the volute formed with rectangle, polygon or circle。It addition, in the preferred embodiments of the present invention, the winding turns contained by each layer line ring layer is identical。
In the preferred embodiments of the present invention, this insulation spacer forms a kerf, embeds for this linking part。
In the preferred embodiments of the present invention, in adjacent two coil layer, at least one coil layer provides on a base plate。This base plate is the sheeting of electric insulation。In other preferred embodiments, the coiling of each coil layer includes the cladding material being coated with this wire material。This cladding material is the material of electric insulation。
In some example of the present invention, the coiling of each circle surrounds one week。
A kind of flat surface transformer using planar coil of the present invention can include this planar coil, at least one second coil, and an iron core。This planar coil is overlapped with this second coil, and this iron core extends to the direction of this two coil place plane vertical, and through the middle part of this two coil。This flat surface transformer may also include a metal shell, is coated with the coiler part of this iron core and this two coil。
In some examples of the present invention, this second coil is the planar coil of the present invention。In this kind of example, each layer of two groups of planar coils interts mutually overlapped。
Above-mentioned and other objects and advantages of the present invention, can by described further below and referring to accompanying drawing, and clearly。
Accompanying drawing explanation
Fig. 1 is the structural representation of an embodiment of planar coil of the present invention。
Fig. 2 A to Fig. 2 F is the Making programme schematic diagram of the planar coil of Fig. 1。
Fig. 3 is the structural representation of an embodiment of flat surface transformer of the present invention。
Label declaration
1 transformator
10 first circumvolution ring layers
11 connection pads
14 connecting portions
20 second circumvolution ring layers
21 connection pads
22 outer ring coilings
23 inner ring coilings
24 connecting portions
30 second layer coils
32 outer ring coilings
33 inner ring coilings
34 connecting portions
40 third layer coils
42 outer ring coilings
43 inner ring coilings
100 planar coils
200 second coils
300 is unshakable in one's determination
410 upper shells
420 lower houses
Detailed description of the invention
The planar coil of flat surface transformer of the present invention and the various embodiments of flat surface transformer are described based on the following accompanying drawing。But must illustrating, the present invention, for the explanation of embodiment, is only illustrating the basic framework of the present invention and possible application, is not being used for limiting the scope of the present invention。
The present invention proposes the novel structure of the planar coil of a kind of flat surface transformer。According to the present invention, for the planar coil of flat surface transformer, it is possible to use a continuous material makes。Under planar coil framework proposed by the invention, this coiling number of plies contained by continuous material planar coil and the number of turns, it is possible to according to the demand in application, arbitrary decision。Unique restriction is only that, this coiling number of plies contained by continuous material planar coil is positive even numbers。Therefore, the invention provides one and substantially for not limit the number of turns, can not limit the planar coil construction of the number of plies。
The planar coil of the flat surface transformer according to the present invention, for a kind of planar coil made with continuous material。Owing to continuous material can be utilized to make, therefore simple Work machine can be used, set the such as number of plies, the number of turns, layer from circle from etc. after parameter, a large amount of continuously make。
Namely Fig. 1 shows the structural representation of planar coil one embodiment of flat surface transformer of the present invention。Figure shows the planar coil 100 completed according to embodiments of the present invention。This planar coil 100 includes being formed by continuous material: the first circumvolution ring layer 10 being arranged in figure top ground floor, the second circumvolution ring layer 20 being arranged in figure bottom that is the 4th layer and be positioned between the two and connect both second layer and third layer circumvolution ring layer 30,40。Displaying that in figure, this ground floor coil 10, second layer coil 30, third layer coil 40 and the 4th layer line circle 20 are sequentially connected in series, overlapped。The outboard end of this first circumvolution ring layer 10 and the second circumvolution ring layer 20 each extends over formation connection pad 11,21。
Although the planar coil 100 shown in figure is containing 4 layer line ring layers, but those skilled in the art are all appreciated that, as long as the coil layer number of plies between the first circumvolution ring layer 10 and the second circumvolution ring layer 20 is even number, this planar coil 100 can be met by outside coil, such as this connection pad 11 place, extend in loop construction, and by outside coil, for instance the demand of this loop construction is extended at this connection pad 21 place。Therefore, the coil layer number of plies between the first circumvolution ring layer 10 and the second circumvolution ring layer 20 can be the positive even numbers such as 0,2,4。Certainly, depending on this coil-winding material thickness and required voltage conversion proportion, and power during application and determine, the total number of plies of coil layer of this planar coil 100 is unsuitable too much, in order to avoid affecting effect of transformator。
Same, according to the present invention design, the volute winding turns of each coil layer is also unrestricted。According to following description, the coiling of every layer all includes some circles, and is extended to inner circumferential by periphery or extended to periphery by inner circumferential。Each circle substantially surrounds one week。The coiling of adjacent two layers coil layer, if one layer is extended to inner circumferential by periphery, then namely the coiling of another layer is extended to periphery by inner circumferential。Vice versa。At this under design, the volute winding turns of each layer is also unrestricted。But depending on the voltage conversion ratio example of the width on this coil-winding design of material, required planar coil, the size of transformator when diameter unshakable in one's determination and application and determine, the winding turns contained by each coil layer also unsuitable too much。In the preferred embodiments of the present invention, winding turns contained by each layer line ring layer is identical。Take its facility made, not any technical restriction。
This planar coil 100 is to make with a continuous material, makes the coiling in each layer line ring layer be positioned essentially at same plane。Connect with connecting portion 14 between two coil layer。The linking part of wantonly two circumvolution ring layers connects the plane at this ring layer place, two wires。In some application example of the present invention, this planar coil 100 may also include the insulation spacer (not shown) being positioned at wantonly two volute coil interlayers。If it is necessary, this insulation spacer can form a kerf, embed for this linking part 14。The material of this insulation spacer can use any commercially available insulant, as long as being suitable to processing and being provided that good insulation effect。Its thickness should not be too thick, but also should not be too thin, in order to avoid damaging its insulation effect and fixing function。
The planar coil 100 of the present invention can make by any conductive material。The material being suitable for includes various metal or alloy, for instance aluminum, copper, silver, pyrite etc.。The material of this planar coil 100 may also include the insulating barrier of cladding coiling。The material being suitable for includes any commercially available insulant, as long as being suitable to processing and being provided that good insulation effect。Its thickness is also unrestricted, but is advisable with the material that ductility is good, to avoid being affected by processing。
The coiling of each layer line ring layer forms volute。Including the volute formed with rectangle, polygon or circle。But from the angle of handling ease, the volute that this volute is formed with circle, comparatively applicable。The thickness of each coiling, width, and maximum, the minimum diameter of volute, and unrestrictedly。In some examples of the present invention, the coiling of each circle surrounds one week, makes coiling angle reach maximum。But, it is contemplated that this connecting portion 14 connects the characteristic of adjacent two planes, as each circle coiling need to be made all to surround one week, it will make all of connecting portion be all located on same projection plan-position。Therefore, when application it is contemplated that on average configure the position of this connecting portion。Certainly, in such instances, it is not that each circle coiling all surrounds one week。
In the preferred embodiments of the present invention, in adjacent two coil layer, at least one coil layer provides on a base plate。This base plate is the sheeting of electric insulation。
The manufacture method of this planar coil 100 of following description。Fig. 2 A to Fig. 2 F represents the Making programme schematic diagram of the planar coil 100 shown in Fig. 1。As shown in Figure 2 A, when making this planar coil 100, first by a continuous material, this second circumvolution ring layer 20 is formed。This second circumvolution ring layer 20 has a connection pad 21, outer ring coiling 22 and inner ring coiling 23。Each coiling 22,23 is substantially flat material layer。This connection pad 21 is extended out by coiling 22,23, and to vertically extending, can reach this connection pad 21 place plane。Then, as shown in Figure 2 B, inner ring coiling 23 in this second circumvolution ring layer 20 forms the connecting portion 24 of this second circumvolution ring layer 20 (the 4th layer in structure) and third layer circumvolution ring layer 40, and then formed the inner ring coiling 43 of this third layer circumvolution ring layer 40 by this connecting portion 24, and extend to form its outer ring coiling 42。Fig. 2 C shown after third layer circumvolution ring layer 40。Then, as shown in Figure 2 D, continued to extend to form the connecting portion 34 between third layer circumvolution ring layer 40 and second layer volute coil 30 by the outer ring coiling 42 of this third layer circumvolution ring layer 40, and be subsequently formed the outer ring coiling 32 of this second layer circumvolution ring layer 30, with and subsequent inner ring coiling 33。Fig. 2 E shown after second layer circumvolution ring layer 30。Afterwards, as shown in Figure 2 F, the inner ring coiling 33 of this second layer circumvolution ring layer 30 continue to extend to form ground floor circumvolution ring layer, i.e. connecting portion 14 between the first circumvolution ring layer 10 and second layer volute coil 30, and be subsequently formed this first circumvolution ring layer 10。Fig. 1 namely shown after the first circumvolution ring layer 10。So, the making of planar coil 100 of the present invention is namely completed。
Form the usability methods of this homogenous material planar coil 100, including any metalworking technology。The known technologies such as the technology being suitable for includes low-temperature deformation, high temperature deformation, cuts, punching press or its combine。In the preferred embodiments of the present invention, this planar coil 100 is to be formed in low-temperature deformation mode。Utilize a mould, form guiding groove, this planar coil 100 material is squeezed into this groove, after forming each layer line ring layer of continuous print, then form connection pad with impact style。The making of planar coil 100 of the present invention can be completed。
Fig. 1 shows that the connection pad 11,21 of this planar coil 100 is positioned at adjacent position, and is positioned at identical height。The convenient surface mount processing of this design。But non-any technical limitations。
Fig. 3 represents the structural representation of a kind of embodiment of flat surface transformer of the present invention。As it can be seen, a kind of flat surface transformer 1 using planar coil of the present invention can include this planar coil 100, at least one second coil 200, and an iron core 300。This planar coil 100 is overlapped with this second coil 200。This iron core 300 extends to the direction of this two coil 100,200 place plane vertical, and through the middle part of this two coil 100,200。This flat surface transformer 1 may also include a metal shell, including upper shell 410 and a lower house 420, is coated with this iron core 300 and the coiler part of this two coil 100,200。This housing, except protecting this transformator 1, also provides for the function of electromagnetic wave barrier。This second coil 200 can make by the good material of any electric conductivity。Its structure and shape are also unrestricted。In the preferred embodiments of the present invention, this second coil 200 has the structure identical or approximate with planar coil 100 of the present invention, but the total number of plies having/winding turns is different, to reach the function needed for transformator。In the application, if this planar coil 100 is primary coil, then this second coil 200 is secondary coil。Vice versa。The quantity of this planar coil 100 or the second coil 200 is also unrestricted with the contained number of plies, the number of turns。
The material of this iron core 300 and shape, size, according to the demand in application, can select from known technology。The material of this upper and lower casing 410,420, shape and size, it is possible to according to the demand in application, select from known technology。Additionally, this housing is also not necessarily limited in the way of upper-lower casing combination。Make housing with homogenous material or combine with more than two assembly, also belonging to feasible。If necessary, it is possible to omit the housing of wherein one side or increase the number of plies of a wherein housing。All this all belongs to the category of known technology, is not necessary to repeat at this。
In structure shown in Fig. 3, this planar coil 100 and second mutual storehouse of coil 200。But this example is not any technical restriction。In some examples of the present invention, this second coil 200 is the planar coil of the present invention, and by each layer of two groups of planar coils 100,200, or part layer interts mutually overlapped。
Claims (29)
1. a planar coil for flat surface transformer, including what formed by continuous material: the first circumvolution ring layer, the second circumvolution ring layer and both the N number of circumvolution ring layer of connecting, this is first, second overlapped with N number of circumvolution ring layer；Wherein, N is 0 or positive even numbers；The linking part of wantonly two circumvolution ring layers connects the plane at this ring layer place, two wires。
2. planar coil as claimed in claim 1, it is characterised in that: this first or second circumvolution ring layer also includes the connection pad of an extension。
3. planar coil as claimed in claim 1 or 2, it is characterised in that: also include the insulation spacer being positioned at wantonly two volute coil interlayers。
4. planar coil as claimed in claim 3, it is characterised in that: this insulation spacer forms a kerf, embeds for this linking part。
5. planar coil as claimed in claim 1 or 2, it is characterised in that: the coiling of each coil layer includes the insulating material being coated with this wire material。
6. planar coil as claimed in claim 1 or 2, it is characterised in that: in adjacent two coil layer, at least one coil layer provides on a base plate, and this base plate is the sheeting of electric insulation。
7. planar coil as claimed in claim 1 or 2, it is characterised in that: this circumvolution ring layer has positive even numbers circle or the coiling of positive odd number circle。
8. planar coil as claimed in claim 1 or 2, it is characterised in that: the winding turns contained by each layer line ring layer is identical。
9. planar coil as claimed in claim 1 or 2, it is characterised in that: this volute includes the one in the volute formed with rectangle, polygon or circle。
10. planar coil as claimed in claim 1 or 2, it is characterised in that: the coiling of each coil layer surrounds one week。
11. planar coil as claimed in claim 5, it is characterised in that: the winding turns contained by each layer line ring layer is identical。
12. planar coil as claimed in claim 5, it is characterised in that: this volute includes the one in the volute formed with rectangle, polygon or circle。
13. planar coil as claimed in claim 5, it is characterised in that: the coiling of each coil layer surrounds one week。
14. a flat surface transformer, including planar coil as claimed in claim 1 or 2, at least one second coil, and an iron core；Wherein, this planar coil is overlapped with this second coil, and this iron core extends to the direction of this two coil place plane vertical, and through the middle part of this two coil。
15. flat surface transformer as claimed in claim 14, it is characterised in that: also include a metal shell, be coated with the coiler part of this iron core and this two coil。
16. flat surface transformer as claimed in claim 14, it is characterised in that: the coiling of each coil layer of this planar coil includes the insulating material being coated with this wire material。
17. flat surface transformer as claimed in claim 14, it is characterised in that: in adjacent two coil layer of this planar coil, at least one coil layer provides on a base plate, and this base plate is the sheeting of electric insulation。
18. flat surface transformer as claimed in claim 14, it is characterised in that: the winding turns contained by this planar coil each layer line ring layer is identical。
19. flat surface transformer as claimed in claim 14, it is characterised in that: the volute of this planar coil includes the one in the volute formed with rectangle, polygon or circle。
20. flat surface transformer as claimed in claim 14, it is characterised in that: the coiling of each coil layer of this planar coil surrounds one week。
21. flat surface transformer as claimed in claim 14, it is characterised in that: this second coil is a kind of planar coil as claimed in claim 1。
22. a flat surface transformer, including planar coil as claimed in claim 1 or 2, at least one second coil, and an iron core；Wherein, this planar coil is a part of interspersed overlapped mutually with this each layer of the second coil, and this iron core extends to the direction of this two coil place plane vertical, and through the middle part of this two coil。
23. flat surface transformer as claimed in claim 22, it is characterised in that: also include a metal shell, be coated with the coiler part of this iron core and this two coil。
24. flat surface transformer as claimed in claim 22, it is characterised in that: the coiling of each coil layer of this planar coil includes the insulating material being coated with this wire material。
25. flat surface transformer as claimed in claim 22, it is characterised in that: in adjacent two coil layer of this planar coil, at least one coil layer provides on a base plate, and this base plate is the sheeting of electric insulation。
26. flat surface transformer as claimed in claim 22, it is characterised in that: the winding turns contained by this planar coil each layer line ring layer is identical。
27. flat surface transformer as claimed in claim 22, it is characterised in that: the volute of this planar coil includes the one in the volute formed with rectangle, polygon or circle。
28. flat surface transformer as claimed in claim 22, it is characterised in that: the coiling of each coil layer of this planar coil surrounds one week。
29. flat surface transformer as claimed in claim 22, it is characterised in that: this second coil is a kind of planar coil as claimed in claim 1。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410709678.7A CN105702425A (en) | 2014-11-28 | 2014-11-28 | Planar coil and planar transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410709678.7A CN105702425A (en) | 2014-11-28 | 2014-11-28 | Planar coil and planar transformer |
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| Publication Number | Publication Date |
|---|---|
| CN105702425A true CN105702425A (en) | 2016-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410709678.7A Pending CN105702425A (en) | 2014-11-28 | 2014-11-28 | Planar coil and planar transformer |
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| JP2001284130A (en) * | 2000-03-29 | 2001-10-12 | Densei Lambda Kk | Inductance device |
| JP2003264110A (en) * | 2002-03-12 | 2003-09-19 | Tdk Corp | Spiral coil and transformer |
| CN1462457A (en) * | 2001-03-05 | 2003-12-17 | Tdk株式会社 | Planar coil and planar tranformer |
| US20110115598A1 (en) * | 2009-11-19 | 2011-05-19 | Delta Electronics, Inc. | Bobbin structure and transformer having the same |
| CN102446623A (en) * | 2010-10-13 | 2012-05-09 | 林志豪 | Asymmetric flat transformer |
| WO2013046533A1 (en) * | 2011-09-30 | 2013-04-04 | パナソニック 株式会社 | Planar coil and coil module, power reception apparatus, and contactless power transmission apparatus provided with same |
| CN203746622U (en) * | 2014-01-06 | 2014-07-30 | 吴李文相 | Modular coil plate, coil assembly and planar transformer with coil plate or coil assembly |
| CN203774059U (en) * | 2014-01-06 | 2014-08-13 | 吴李文相 | Planar coil module and planar transformer using same |
| CN203774058U (en) * | 2014-01-06 | 2014-08-13 | 吴李文相 | Planar coil assembly, planar coil module and planar transformer |
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2014
- 2014-11-28 CN CN201410709678.7A patent/CN105702425A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001284130A (en) * | 2000-03-29 | 2001-10-12 | Densei Lambda Kk | Inductance device |
| CN1462457A (en) * | 2001-03-05 | 2003-12-17 | Tdk株式会社 | Planar coil and planar tranformer |
| JP2003264110A (en) * | 2002-03-12 | 2003-09-19 | Tdk Corp | Spiral coil and transformer |
| US20110115598A1 (en) * | 2009-11-19 | 2011-05-19 | Delta Electronics, Inc. | Bobbin structure and transformer having the same |
| CN102446623A (en) * | 2010-10-13 | 2012-05-09 | 林志豪 | Asymmetric flat transformer |
| WO2013046533A1 (en) * | 2011-09-30 | 2013-04-04 | パナソニック 株式会社 | Planar coil and coil module, power reception apparatus, and contactless power transmission apparatus provided with same |
| CN203746622U (en) * | 2014-01-06 | 2014-07-30 | 吴李文相 | Modular coil plate, coil assembly and planar transformer with coil plate or coil assembly |
| CN203774059U (en) * | 2014-01-06 | 2014-08-13 | 吴李文相 | Planar coil module and planar transformer using same |
| CN203774058U (en) * | 2014-01-06 | 2014-08-13 | 吴李文相 | Planar coil assembly, planar coil module and planar transformer |
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Application publication date: 20160622 |