CN203774059U - Planar coil module and planar transformer using same - Google Patents
Planar coil module and planar transformer using same Download PDFInfo
- Publication number
- CN203774059U CN203774059U CN201420011640.8U CN201420011640U CN203774059U CN 203774059 U CN203774059 U CN 203774059U CN 201420011640 U CN201420011640 U CN 201420011640U CN 203774059 U CN203774059 U CN 203774059U
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- Prior art keywords
- planar coil
- module
- planar
- linking part
- coil module
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- Expired - Lifetime
Links
- 239000000463 material Substances 0.000 claims description 17
- 238000004804 winding Methods 0.000 claims description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 239000004020 conductor Substances 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000010410 layer Substances 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 7
- 238000010618 wire wrap Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000109 continuous material Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005555 metalworking Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Landscapes
- Coils Of Transformers For General Uses (AREA)
Abstract
The utility model discloses a planar coil module. The planar coil module comprises a first planar coil, a second planar coil and a connecting part, wherein the connecting part is connected with the first planar coil and the second planar coil in series; each of the first planar coil and the second planar coil respectively comprises an outer ring and an inner ring which are electrically connected in series, and the connecting part is electrically connected with the inner ring of the first planar coil and the inner ring of the second planar coil; the first planar coil and the second planar coil are positioned on two adjacent flat surfaces and are in certain distance. The utility model also discloses a planar transformer using the planar coil module.
Description
Technical field
The utility model relates to a kind of planar coil module, particularly relates to a kind of planar coil module that is applied to flat surface transformer.The utility model provides the planar coil module of a kind of multilayer, multi-turn number.The utility model discloses the flat surface transformer that uses this planar coil module simultaneously.
Background technology
Transformer is the significant components of electronic product power supply.Existing volume of transformer is huge, cannot meet the requirement of product miniaturization.Flat surface transformer (Planar transformer, or title flat-plate transformer) be at multilayer board (Printed circuit board, PCB) the upper conductive foil such as Copper Foil of laying are as winding, and the transformer that storehouse forms can dwindle the thickness of transformer greatly.Flat surface transformer is widely used in the products such as communication, computer, Industry Control, aeronautical engineering, Medical Devices.But, because flat surface transformer need to be used the circuit board of suitable multilayer, volume is still large; And because efficiency is not high, output impedance is also large, easily produces noise.How to reach flat surface transformer slimming, high efficiency, become the technical barrier that the industry urgently overcomes.
TaiWan, China patent of invention discloses a kind of flat surface transformer No. I387981, only comprises single printed circuit board (PCB).But, this single printed circuit board (PCB) comprises a plurality of primary circuit layers, a plurality of secondary circuit layer and for the through hole of magnetic core is installed.This patent is produced on most wire winding layers on multilager base plate, and the single printed circuit board (PCB) of whole formation, to reduce thickness.But structure is identical with the flat surface transformer structure of using multilayer board to form.
TaiWan, China patent of invention provides a kind of transformer No. I357086, is suitable for being disposed in circuit base plate.Transformer comprises the first planar coil and the second planar coil, and wherein the first planar coil has a plurality of the first pitch of the laps, and the second planar coil has a plurality of the second pitch of the laps.At least two the first adjacent pitch of the laps form the first pitch of the laps bundle.At least two the second adjacent pitch of the laps form the second pitch of the laps bundle.Both cross over mutually, reduce thus the number of plies of planar coil.
Chinese invention patent CN103081044A discloses a kind of flat surface transformer, has individual layer, the individual pen wire-wrap board of multilayer, and with different wire-wrap board combinations, according to different needs, forms the flat surface transformer of different kenels.
European patent EP 2602801A1 discloses a kind of flat surface transformer, has a plurality of individual layers, individual pen coiling metallic plate, as secondary rolling thread, to combine with elementary coiling.
German patent DE 10 2,012 003 365A1 disclose a kind of flat surface transformer, use volute bonding jumper as coiling.This volute bonding jumper is individual layer, multi-turn design.The terminal bending of coiling inner ring is passed through insulation board to another plane.
European patent EP 2 637 183A2 disclose a kind of flat surface transformer, use individual layer individual pen wire-wrap board as coil.Wire-wrap board extends pad (pad) shape, using as between layers, and with extraneous connecting electrode.
The open case 2013-278371A1 of United States Patent (USP) discloses a kind of flat surface transformer, uses the planar metal coiling of a plurality of individual layers, and a plurality of metal coilings are connected and location with terminal, reaches the object of multilayer winding.
Patent Cooperation Treaty patent WO0070926A1 discloses a kind of flat surface transformer, uses continuous material to make multilayer, individual pen wire-wrap board.Tongue piece with bond pad shapes between each layer is connected in series.
From the state of the art of flat surface transformer, industry, for the miniaturization of flat surface transformer, is the exploitation of doing one's utmost.But still be difficult to break away from prior art with the conventional design of print circuit plates making flat surface transformer.The design proposing, all usings single-layer winding plate as the unit combining, and also cannot propose a kind of design of really reaching multi-turn coiling object.
Utility model content
The purpose of this utility model is to provide a kind of planar coil framework of novelty, to increase in fact the number of turns and the number of plies of planar coil module.
The purpose of this utility model is also to provide the planar coil module of a kind of multilayer, multi-turn.
Another object of the utility model is to provide a kind of and is easily connected in series with other planar coil module or the planar coil module of applied in any combination.
The purpose of this utility model is more to provide a kind of flat surface transformer that uses the planar coil module of multilayer, multi-turn.
It is a kind of simple for production and be applicable to being applied in the flat surface transformer that surface mount is installed that the purpose of this utility model is more to provide.
The utility model provides a kind of planar coil module, it is characterized in that, comprising: the first planar coil, the second planar coil, and linking part, electrically contact described the first planar coil and described the second planar coil; Wherein, described the first planar coil and described the second planar coil respectively comprise outer ring and the inner ring of electrical series winding, and this outer ring and inner ring keep a distance each other; Described linking part is electrically connected the described inner ring of described the first planar coil and described the second planar coil; Described the first planar coil and described the second planar coil are positioned at adjacent two planes, and keep a distance; And one end that its inner ring is left in the described outer ring of described the first planar coil and described the second planar coil forms pad.
In preferred embodiment of the present utility model, this linking part can be the electric conducting material different from the first planar coil, the second planar coil.
In preferred embodiment of the present utility model, this planar coil module also comprises insulating trip, and it is between this first planar coil and this second planar coil.This insulating trip forms otch, for this linking part, embeds.
In some embodiment of the present utility model, this first planar coil, this second planar coil and this linking part are formed as one by same material.In other embodiments, this first planar coil and this second planar coil are making respectively, and connect with this linking part.In this kind of embodiment, this linking part can be wlding or stickiness electric conducting material.
In some embodiment of the present utility model, this first planar coil and this second planar coil form volute.In this embodiment, the interior week of this first planar coil and this second planar coil and periphery form substantial one week respectively.In other embodiment of the utility model, this first planar coil and this second planar coil form rectangular profile, for example, be to be positioned at isoplanar multiple square type, or be positioned at isoplanar multiple square.In this embodiment, the interior week of this first planar coil and this second planar coil and periphery form substantial one week respectively.
The utility model also provides a kind of flat surface transformer, comprise the first planar coil module, with the second planar coil module of this first planar coil module stack, and unshakable in one's determination; It is characterized in that: this iron core extends to the direction perpendicular to this first planar coil module flat and the second planar coil module flat, and pass the middle body of this first planar coil module and the second planar coil module flat; This first planar coil module comprises the first planar coil, the second planar coil, and linking part, this linking part electrically contact this first planar coil and this second planar coil; Wherein: this first planar coil and this second planar coil respectively comprise outer ring and the inner ring of electrical series winding, and this outer ring and inner ring keep a distance each other; This linking part is electrically connected the described inner ring of this first planar coil and the second planar coil; This first planar coil and this second planar coil are positioned at adjacent two planes, and keep a distance; And one end that its inner ring is left in the described outer ring of this first planar coil and this second planar coil forms pad; And this second planar coil module comprises at least one planar coil.
In some embodiment of the present utility model, this flat surface transformer also can comprise a metal shell, the coiler part of coated this iron core and this two planar coils module.
Above-mentioned and other object and the advantage of the utility model, by following detailed description and with reference to accompanying drawing, can be clearer.
Accompanying drawing explanation
Fig. 1 is the flat surface transformer structural representation that uses planar coil module of the present utility model.
Fig. 2 is the stereogram of a kind of embodiment of planar coil module of the present utility model.
Fig. 3 is the enlarged drawing of linking part embodiment illustrated in fig. 2.
Description of reference numerals
1 transformer
10 planar coil modules
11,12 pads
13 first planar coils
14 second planar coils
131,141 outer rings
132,142 inner rings
15 linking parts
18 insulating trips
181 otch
182 holes
21,22 coil plate
23,24 insulating trips
25,26 pads
30 iron cores
40 housings
41 upper shells
42 lower houses
Embodiment
Below, a plurality of embodiment of planar coil module of the present utility model are described with reference to the accompanying drawings.But must illustrate, for the explanation of the utility model embodiment, only, for the basic framework of illustration the utility model planar coil module and possible application, not be used for limiting scope of the present utility model.
Fig. 1 is the structural representation that the flat surface transformer that uses planar coil module of the present utility model is shown.As shown in Figure 1, in this embodiment, this flat surface transformer 1 comprises 10, two groups of individual layers of one group of planar coil module, one-turn coil plate 21,22, iron core 30 and the housing 40 being comprised of upper shell 41 and lower house 42.This planar coil module 10 is placed between these two coil plate 21,22, and isolated with insulating trip 23,24.This planar coil module 10 forms hole with this two wires girth sheets 21,22 and insulating trip 23,24 at middle body.The direction of unshakable in one's determination 30 coil planes with vertical this planar coil module 10 and these two coil plate 21,22, through this planar coil module 10 and these two coil plate 21,22 and insulating trip 23,24.Planar coil module 10 separately has two pads 11,12 to stretch out outside module.These two coil plate, 21,22 serial connections, and have respectively two pads 25,26 to stretch out outside module, be positioned at opposite sides with the pad 11,12 of this planar coil module 10.Certainly, whether the pad of two-stage coiling is placed in two opposite sides, is not any technical restriction.Above-mentioned combination forms one group of transformer 1.
Upper shell 41 and lower house 42 cover respectively the coiler part of this iron core 30 and this planar coil module 10 and this two wires girth sheets 21,22.Except protecting this transformer 1, this upper shell 41 and lower house 42 also can provide the function of electromagnetic wave barrier.The pad 11,12 of this planar coil module 10 and the pad 25,26 of this two wires girth sheets 21,22 can surface mount mode be assembled on circuit substrate this transformer 1.
In embodiment of the present utility model, this planar coil module 10 is all made with the material of good conductivity with these two coil plate 21,22.Applicable material comprises various metals, such as copper, silver etc.This coil plate 21,22 can be used any type of planar line girth sheets, the planar coil that for example aforementioned prior art is recorded, but also can use planar coil module of the present utility model.Quantity and the compound mode of this planar coil module 10 and this two wires girth sheets 21,22, be not limited to the framework shown in Fig. 1.Industry technical staff can be according to needs, voluntarily applied in any combination.Position relationship between the two is also not limited to completely overlapping.The for example mode of passing through of German patent DE102012003365A1, and offset alignment mode, all belongs to feasible.
The material that this is unshakable in one's determination and shape, size can, according to the demand in application, be selected from known technology.The material of this housing 40, shape and size also can, according to the demand in application, be selected from known technology.In addition, this housing 40 is also not limited to the mode of upper and lower casing combination.With homogenous material, make housing or with more than two assembly combinations, also belong to feasible.If necessary, can omit wherein the housing of one side or increase the wherein number of plies of a housing.The category that all belongs to known technology like that, repeats no more.
Fig. 2 is the stereogram of an embodiment of planar coil module of the present utility model.As shown in Figure 2, this planar coil module 10 comprises the first planar coil 13, the second planar coil 14 and linking part 15.In the present embodiment, this first planar coil 13, this second planar coil 14 are to be formed as one by same material with this linking part 15.This first planar coil 13, this second planar coil 14 are made with the material of good conductivity with this linking part 15.Applicable material comprises various metals, such as copper, silver etc.From the easy equal angles of cost, processing, conductivity and assembling, consider, Copper Foil should be preferred selection, but is not any technical restriction.The first planar coil 13, the second planar coil 14 that form this homogenous material can adopt any metalworking technology to make with linking part 15.Known technology or its combinations such as applicable technology comprises coating, low-temperature deformation, high temperature deformation, cuts, punching press, etching.
This first planar coil 13, this second planar coil 14 and this linking part 15 also can be can't help same material and be formed as one.For example, after this first planar coil 13 can complete respectively with this second planar coil 14, then connect with this linking part.In this embodiment, this linking part 15 can be wlding or stickiness electric conducting material.When making in this way, must be noted that to make electrically this first planar coil 13 and this second planar coil 14 of series winding of this linking part 15.
Fig. 2 also illustrates, and this first planar coil 13 and this second planar coil 14 respectively comprise outer ring 131,141 and the inner ring 132,142 of electrical series winding, and they keep a distance each other.Although this first planar coil 13 is shown in figure, respectively comprise two circle coilings with this second planar coil 14, the utility model is not limited to the structure of two circle coilings.More than two circles, wind the line also applicable to the utility model.This number of turns depends on the width of required voltage transitions ratio, coiling, the diameter of the distance of each circle and unshakable in one's determination 30, therefore non-any technical restriction.In addition, material width, the thickness of each circle coiling, even shape, all can optionally determine.Substantially, material and easily processing are comparatively saved in the coiling of surface formation plane.
In the embodiment of Fig. 2, this linking part 15 is electrically connected the inner ring 132,142 of these two planar coils 13,14, and the coiling of these two planar coils 13,14 is all extended along identical clockwise.Fig. 3 is the enlarged drawing of this linking part 15.Shown in figure, this linking part 15 links this first planar coil 13 and this second planar coil 14, and forms one section of difference, makes this first planar coil 13 be positioned at adjacent two planes with this second planar coil 14, and keeps a distance.Certainly, linking part 15 of the present utility model is not limited to the shape of Fig. 3.For example, form domatic, so that this first planar coil 13 is positioned at adjacent two planes with this second planar coil 14, and keeps a distance, also belong to feasible.If linking part 15 is wlding or stickiness electric conducting material, formed shape will be a solder side or a gluing face.As long as can make the first planar coil 13 and the second planar coil 14 electrically contact, be positioned at adjacent two planes, and keep a distance.
On the outer ring 131,141 of this first planar coil 13 and this second planar coil 14, leave one end of its inner ring 132,142, this coiling is extended and formation pad (pad) 11,12.This pad 11,12 can bending, forms the pad that is suitable for surface mount processing.In addition, also can form larger area pad to horizontal expansion, so that function fixing or heat radiation to be provided.In addition, the position of each pad 11,12 can be adjusted, to be located at the pin position of standard surface adhesive assembly.
The first planar coil 13 shown in Fig. 2 and the second planar coil 14 all form volute, that is slightly rounded profile.This design can provide good conversion efficiency.But the utility model is not limited to the coiling of volute.For example conventional square, the rectangle coiling of prior art, and even the coiling of other geometry, all applicable to the utility model.Shown in figure, the interior week of this first planar coil and this second planar coil and periphery form substantial one week respectively.This design can guarantee that the coiling angle of this first planar coil 13 and the second planar coil 14 reaches maximum, but this is not any technical restriction.If this coiling is volute not, still can make the interior week of this first planar coil and the second planar coil and periphery form respectively substantial one week, it is maximum that the angle that makes thus to wind the line reaches.
In the embodiment of Fig. 2, this planar coil module 10 also comprises insulating trip 18, and it is between this first planar coil 13 and this second planar coil 14, with electrically isolated these two planar coils.The material of this insulating trip can be used any commercially available insulating material, as long as be suitable for processing and good insulation effect can be provided.The thickness of insulating trip 18 should not be too thick, but also should not be too thin, thereby avoid weakening its insulation effect and fixed function.This insulating trip 18 forms otch 181, embeds, to form firm planar coil module 10 for this linking part 15.The degree of depth of this otch 181 is depending on the needs in application, but had better not extend to the hole 182 of these insulating trip 18 central authorities.
If necessary, can impose adhesive agent at the upper and lower faces of this insulating trip 18, to improve the locating effect of the first planar coil 13 and the second planar coil 14.In addition, the coiling surface at this first planar coil 13 and the second planar coil 14, also can apply insulating coating (not shown), to improve insulation effect.
When assembling, the coiling of this planar coil module 10 is best to wind the line overlapping with contiguous coil plate 21,22 (Fig. 1).But use and pass through mode or offset alignment mode, also belong to feasible.
As above-mentioned, the utility model provides a kind of brand-new planar coil module architectures.This planar coil module has the coiling of multilayer, multi-turn, is enough to provide more greatly optionally conversion proportion.The coiling of this planar coil module can form homogenous material, is easy to make and assembling.Planar coil module of the present utility model does not need to use print circuit plates making, significantly the thickness of reduced plan transformer.And because single module forms the coiling of multilayer, multi-turn, can reduce impedance, improve conversion efficiency.
Claims (20)
1. a planar coil module, is characterized in that, comprising:
The first planar coil,
The second planar coil, and
Linking part, this linking part is described the first planar coil of series winding and described the second planar coil electrically;
Wherein, described the first planar coil and described the second planar coil respectively comprise outer ring and the inner ring of electrical series winding, and this outer ring and this inner ring keep a distance each other;
Described linking part is electrically connected the described inner ring of described the first planar coil and described the second planar coil;
Described the first planar coil and described the second planar coil are positioned at adjacent two planes, and keep a distance; And
One end that inner ring described in it is left in the described outer ring of described the first planar coil and described the second planar coil forms pad.
2. planar coil module as claimed in claim 1, is characterized in that, described linking part is the electric conducting material different with described the second planar coil from described the first planar coil.
3. planar coil module as claimed in claim 1, is characterized in that, also comprises an insulating trip, and this insulating trip is between described the first planar coil and described the second planar coil.
4. planar coil module as claimed in claim 3, is characterized in that, described insulating trip forms a kerf, for described linking part, embeds.
5. planar coil module as claimed in claim 1, is characterized in that, described the first planar coil, described the second planar coil and described linking part are formed as one by same material.
6. planar coil module as claimed in claim 1, is characterized in that, described linking part is wlding or stickiness electric conducting material.
7. planar coil module as claimed in claim 1, is characterized in that, described the first planar coil and described the second planar coil form volute.
8. planar coil module as claimed in claim 1, is characterized in that, described the first planar coil and described the second planar coil form and be positioned at isoplanar multiple square type, or are positioned at isoplanar multiple square.
9. planar coil module as claimed in claim 7 or 8, is characterized in that, the interior week of described the first planar coil and described the second planar coil and periphery form substantial one week respectively.
10. a flat surface transformer, comprise the first planar coil module, with the second planar coil module of this first planar coil module stack, and unshakable in one's determination; It is characterized in that:
Described iron core extends to the direction perpendicular to described the first planar coil module flat and described the second planar coil module flat, and passes the middle body of described the first planar coil module and described the second planar coil module flat;
Described the first planar coil module comprises the first planar coil, the second planar coil, and linking part, and this linking part is described the first planar coil of series winding and described the second planar coil electrically; Wherein:
Described the first planar coil and described the second planar coil respectively comprise outer ring and the inner ring of electrical series winding, and this outer ring and this inner ring keep a distance each other;
Described linking part is electrically connected the described inner ring of described the first planar coil and described the second planar coil;
Described the first planar coil and described the second planar coil are positioned at adjacent two planes, and keep a distance; And
One end that inner ring described in it is left in the described outer ring of described the first planar coil and described the second planar coil forms pad; And
Described the second planar coil module comprises at least one planar coil.
11. flat surface transformers as claimed in claim 10, is characterized in that, also comprise metal shell, the coiler part of the coated described iron core of this metal shell and described the first planar coil module and described the second planar coil module.
12. flat surface transformers as described in claim 10 or 11, is characterized in that, the described linking part of described the first planar coil module is the electric conducting material different from described the first planar coil, described the second planar coil.
13. flat surface transformers as described in claim 10 or 11, is characterized in that, described the first planar coil module also comprises insulating trip, and this insulating trip is between described the first planar coil and described the second planar coil.
14. flat surface transformers as claimed in claim 13, is characterized in that, described insulating trip forms a kerf, for described linking part, embed.
15. flat surface transformers as described in claim 10 or 11, is characterized in that, described first planar coil of described the first planar coil module, described the second planar coil and described linking part are formed as one by same material.
16. flat surface transformers as described in claim 10 or 11, is characterized in that, the described linking part of described the first planar coil module is wlding or stickiness electric conducting material.
17. flat surface transformers as described in claim 10 or 11, is characterized in that, described first planar coil of described the first planar coil module and described the second planar coil form volute.
18. flat surface transformers as claimed in claim 17, is characterized in that, the interior week of described the first planar coil and described the second planar coil and periphery form substantial one week respectively.
19. flat surface transformers as described in claim 10 or 11, is characterized in that, described first planar coil of described the first planar coil module and described the second planar coil form and be positioned at isoplanar multiple square type, or are positioned at isoplanar multiple square.
20. flat surface transformers as claimed in claim 19, is characterized in that, the interior week of described the first planar coil and described the second planar coil and periphery form substantial one week respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420011640.8U CN203774059U (en) | 2014-01-06 | 2014-01-06 | Planar coil module and planar transformer using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420011640.8U CN203774059U (en) | 2014-01-06 | 2014-01-06 | Planar coil module and planar transformer using same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203774059U true CN203774059U (en) | 2014-08-13 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420011640.8U Expired - Lifetime CN203774059U (en) | 2014-01-06 | 2014-01-06 | Planar coil module and planar transformer using same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203774059U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104766704A (en) * | 2014-01-06 | 2015-07-08 | 吴李文相 | Plane coil module and plane transformer using same |
| CN105702426A (en) * | 2014-11-28 | 2016-06-22 | 吴李文相 | Planar coil, fabrication method thereof and planar transformer |
| CN105702425A (en) * | 2014-11-28 | 2016-06-22 | 吴李文相 | Planar coil and planar transformer |
-
2014
- 2014-01-06 CN CN201420011640.8U patent/CN203774059U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104766704A (en) * | 2014-01-06 | 2015-07-08 | 吴李文相 | Plane coil module and plane transformer using same |
| CN105702426A (en) * | 2014-11-28 | 2016-06-22 | 吴李文相 | Planar coil, fabrication method thereof and planar transformer |
| CN105702425A (en) * | 2014-11-28 | 2016-06-22 | 吴李文相 | Planar coil and planar transformer |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140813 |