CN203205229U - Large-current planar transformer manufactured on printed circuit board - Google Patents
Large-current planar transformer manufactured on printed circuit board Download PDFInfo
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- CN203205229U CN203205229U CN 201320237214 CN201320237214U CN203205229U CN 203205229 U CN203205229 U CN 203205229U CN 201320237214 CN201320237214 CN 201320237214 CN 201320237214 U CN201320237214 U CN 201320237214U CN 203205229 U CN203205229 U CN 203205229U
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Abstract
The utility model discloses a large-current planar transformer manufactured on a printed circuit board, and relates to the shape of a magnetic core of a planar transformer, a coil topological structure and a coil winding method . The large-current planar transformer manufactured on the printed circuit board structurally comprises magnetic cores and a coil winding set, and is characterized in that a primary winding set is composed of a large circle surrounding two magnetic cores and a small circle surrounding one magnetic core in a series mode, a secondary winding set is composed of a plurality of coils in a parallel mode, various winding sets are arranged on each layer of a PCB in a cycling and staggered mode, and a signal winding set and a power winding set are wound on different magnetic core columns. The large-current planar transformer manufactured on the printed circuit board is small in size, low in height and large in current. The large-current planar transformer manufactured on the printed circuit board is ordinarily integrated on the PCB of a switching power supply, and is used as the power transmission transformer of the switching power supply.
Description
Technical field
The present invention relates to a kind of flat surface transformer, especially a kind of large current plane transformer that is produced on the printed circuit board (PCB) (PCB).
Background technology
Along with the development of Switching Power Supply, small size, high power density more and more are called pursue a goal table and the developing direction of Switching Power Supply, and the various technology that reduce power volume, raising power density are arisen at the historic moment, and the flat surface transformer technology is exactly one.In the Switching Power Supply of conventional art, power transformer is realized by the many groups wire that is wrapped on the magnetic core.Such transformer occupies significant volume, so that switch power module is difficult to do is little, it is thin to do.And because the gap ratio of coiling is larger, the leakage inductance of transformer is also larger, and degree of coupling is relatively poor, and transformer efficiency is lower.The appearance of flat surface transformer has reduced volume and the height of transformer greatly, thereby extremely is conducive to reduce volume and the height of power module, makes power module be able to miniaturization, complanation.Simultaneously, because the flat surface transformer compact conformation has increased the degree of coupling, reduced leakage field; Because reducing of core volume, the energy loss on the magnetic core also reduces, and these all are conducive to improve the efficient of transformer.Therefore, flat surface transformer is widely applied in switch power module now.
Present large electric current, high-power planar transformer, greatly mainly with copper sheet as former limit and secondary winding, a plurality of this windings are stacked, and magnetic core consists of transformer together.There are two subject matters in the flat surface transformer of this structure: the firstth, and the insulation distance that safety requires is difficult the realization, the reinforced insulation that especially requires in the AC/DC converter safety implements comparatively complexity, often wants special skeleton to realize; The secondth, because the multilayer superposition, structural manufacturing process is complicated, and the processing difficulty is large.
Some are also arranged with the flat surface transformer of the wire on the PCB as winding, but these transformer major parts all are to be applied in little electric current, the low power situation, such as secondary power supply DC/DC converter.This moment is as the wire of Transformer Winding, the part of power module PCB normally, and specific practice is: the appropriate location at mainboard PCB forms transformer primary side and secondary winding, and has the hole corresponding to magnetic core, has just formed transformer behind the embedded magnetic core.The advantage of this structure is compact conformation, and the height of transformer is low, and is less on the whole height impact of converter.But because transformer itself namely is the part of PCB, must be subject to thick etc. the restriction of the number of plies of PCB and copper, can't pass through large electric current, can only be applied to little electric current, low power occasion.
Therefore, how when reducing volume and height, make flat surface transformer can transmit larger electric current and power is an important research direction.
The utility model content
The objective of the invention is to overcome the deficiencies in the prior art, a kind of large current plane transformer is provided, be specifically related to the flat surface transformer solution of a kind of high efficiency, small size, low clearance, large electric current.The present invention generally is integrated on the PCB plate of Switching Power Supply, as the power delivery transformer in the Switching Power Supply.
In order to realize above purpose, the technical solution adopted in the utility model: a kind of large current plane transformer that is produced on the printed circuit board (PCB), comprise magnetic core and winding, it is characterized in that: described magnetic core comprises two the first identical shaped magnetic cores and the second magnetic core, described the first magnetic core and the second magnetic core include two core post and two bottom surfaces, two core post are vertical with two bottom surfaces, accompany the multi-layer PCB plate between two bottom surfaces, and two core post are passed respectively the through hole on the multi-layer PCB plate; Place about described the first magnetic core and the second magnetic core, core post is transversely arranged, and the upper core post of the first magnetic core and the upper core post of the second magnetic core are positioned at a horizontally-arranged, and the lower core post of the first magnetic core and the lower core post of the second magnetic core are positioned at a horizontally-arranged;
Described winding is the coil that is printed on the multi-layer PCB plate, and described winding comprises former limit winding and secondary power winding; Former limit winding is comprised of two coils, and around the upper core post of the first magnetic core and the second magnetic core, other numbers of turn are around the upper core post of the first magnetic core or the second magnetic core simultaneously for these two coils some numbers of turn wherein, and two coils must be in parallel when using; Secondary power winding has four groups, comprise that the first secondary power is around, the second secondary power winding, the 3rd secondary power winding and fourth officer limit power winding, wherein the first secondary power winding and the second secondary power winding are around the upper core post of the first magnetic core, and the 3rd secondary power winding and fourth officer limit power winding are around the upper core post of the second magnetic core; The two ends of the first secondary power winding, the second secondary power winding, the 3rd secondary power winding and fourth officer limit power winding are first end and the second end, and the first end of these four windings is Same Name of Ends each other; The second end of the first end of the second end of the first secondary power winding, the second secondary power winding, the 3rd secondary power winding connects together with the first end of fourth officer limit power winding.
Under better performance, the coil of described winding is separately positioned on the different layer of multi-layer PCB plate, the more than one deck of the number of plies that each winding comprises, and the coil of different windings is staggered at each layer of multi-layer PCB plate.
Under better performance, described every group of secondary power winding only has the coils from parallel connection of coils of a circle to form by a plurality of.
Under better performance, described winding also comprises secondary signal winding, and secondary signal winding is looped around the lower core post of the first magnetic core or the lower core post of the second magnetic core.
The beneficial effects of the utility model are: (1) has adopted conducting metal pattern on the PCB of multilayer as former limit and secondary winding, and directly embedded magnetic core forms power transformer, has greatly dwindled the volume of transformer, has alleviated transformer weight.(2) the secondary winding is formed by a plurality of coils from parallel connection of coils, has greatly increased the through-current capability of transformer, makes transformer can bear larger electric current.(3) the power winding is wrapped in respectively on the different core post with the signal winding, and the power circuit portion on the PCB plate and signal circuit section are kept apart, and has avoided the phase mutual interference.
Description of drawings
Fig. 1 is circuit diagram of the present invention and the application schematic diagram of the present invention in the full bridge rectifier of LLC resonant type soft-switch.
Fig. 2 is PCB plate figure of the present invention.
Fig. 3 is the schematic diagram of magnetic core of the present invention and winding.
Embodiment
In order to make those skilled in the art understand better the technical solution of the utility model; below in conjunction with accompanying drawing the utility model is described in detail; the description of this part only is exemplary and explanatory, should any restriction not arranged to protection range of the present utility model.
Below in conjunction with accompanying drawing, according to specific embodiment the present invention is further elaborated.In this example, the present invention is applied in the resonant type soft-switch full-bridge rectification output in the power module, shown in Fig. 1.The present invention includes magnetic core and coil windings.Magnetic core has two, and the circuit on the PCB plate is divided into up and down two parts, and the above is power circuit portion, and the below is signal circuit section, shown in Fig. 2.Be convenient statement, each winding of Fig. 1 is called the first coil 1, the second coil 2, the first secondary power windings 3, the second secondary power winding 4, the 3rd secondary power winding 5, fourth officer limit power winding 6, first signal winding 7, secondary signal winding 8 by mark.
Shown in Fig. 1, coil windings comprises: one group of former limit winding, and it is composed in parallel in resonant circuit by two first, second coils 1,2, and each coil has comprised some circle coilings, and the sense of current of bridging coil must be identical; The first secondary power winding 3, the second secondary power winding 4, the 3rd secondary power winding 5, fourth officer limit power winding 6, each group all is comprised of many coils from parallel connection of coils that only wound the line by a circle.The winding of these former limits and secondary is wrapped on the upper core post of two magnetic cores.The mode of the coiling of former limit winding is that big or small looper is closed, and by the configuration of great circle and ringlet, makes the excitation of the first coil 1 and the second coil 2 all be delivered to all windings of secondary, but this transmission has again and stresses.Coil is upper many around a ringlet which magnetic core, and the excitation in the coil just is delivered on the secondary power winding of this magnetic core more.In this example, coil 1 just is comprised of two great circles and a ringlet that is wrapped in the first magnetic core 10, and the second coil 2 just is comprised of two great circles and a ringlet that is wrapped in the second magnetic core 11.Wherein the ringlet of the first coil 1, the first secondary power winding 3, the 3rd secondary power winding 5, first signal winding 7 are wrapped on the upper core post of the first magnetic core 10; The ringlet of the second coil 2, the second secondary power winding 4, fourth officer limit power winding 6, secondary signal winding 8 are wrapped on the upper core post of the second magnetic core 11; The great circle of the first coil 1, the second coil 2 is wrapped on the upper core post of two magnetic cores.
Secondary power winding has four, and they are the first secondary power winding 3, the second secondary power winding 4, the 3rd pair
Limit power winding 5, fourth officer limit power winding 6, wherein the non-same polarity of the Same Name of Ends of two windings and two other winding links to each other in twos, the i.e. Same Name of Ends of the first secondary power winding 3, the Same Name of Ends of the 3rd secondary power winding 5, the non-same polarity of the 3rd secondary power winding 4, the non-same polarity of fourth officer limit power winding 6 links a little 9 jointly, sees Fig. 1.In the application shown in Fig. 1, point 9 is received the anode of output, and the first secondary power winding 3, the second secondary power winding 4, the 3rd secondary power winding 5, fourth officer limit power winding 6 other four terminals are linked the output negative terminal by first, second, third, fourth 4 switches 16,17,18,19 respectively.The first switch 16 and the 3rd switch 18 are one group, and second switch 17 and the 4th switch 19 are other one group, and during one group of switch closure, another group switch disconnects.The direction of circling of the first secondary power winding 3, the second secondary power winding 4 and the 3rd secondary power winding 5, fourth officer limit power winding 6 is opposite.The coil of secondary winding all is ringlet, and the number of turns is a circle in this example.Each winding can be comprised of a plurality of coils from parallel connection of coils, to increase through-current capability.For example in this example, the first secondary power winding 3, the 3rd secondary power winding 5 are comprised of 4 coils from parallel connection of coils, and the second secondary power winding 4, fourth officer limit power winding 6 are comprised of 3 coils from parallel connection of coils.
The winding of above-mentioned these former limits and secondary all is the power winding, and they are wrapped on the upper core post of two magnetic cores.The winding method of every circle coiling has two kinds of great circle and ringlets, and shown in Fig. 3, the loop of ringlet is around the upper core post of one of them magnetic core; The loop of great circle centers on the upper core post of two magnetic cores simultaneously.The canoe of former limit winding is that big or small looper is closed, and some numbers of turn adopt the great circle mode to twine in some circle coilings of each former limit winding, and other numbers of turn adopt the ringlet mode to twine; Each coil of each group of secondary power winding is that the ringlet mode is twined.Except the winding of these through-put powers of mentioning above, also comprise first signal winding 7, secondary signal winding 8, be wrapped on the lower core post of two magnetic cores, their effect is to power to signal circuit section.Winding of different nature is staggered in each layer cocycle of PCB plate, and namely certain one deck belongs to the winding coil of certain character, and lower one deck must belong to another, and the winding coil of various character is arranged circularly.
The magnetic core that adopts among the present invention is CI type magnetic core, and is bonding by the magnetic core glue of special use.Each magnetic core comprises a part that the part of two core post and a bottom surface is arranged and only have a bottom surface, and the bottom surface of these two parts is round rectangle, and the cross section of core post is that two ends are the strip of round end.Coil windings is formed by the conductive coil of each layer on the multi-layer PCB plate.
Implementation of the present invention is: on the PCB of multilayer plate 15, stamp the hole 20 that coincide with the core post shape, print the metal pattern of conductive coil at each layer of PCB plate 15 around hole 20, the place that needs to connect connects by via hole, embedded magnetic core post in the middle of the hole, the conductive coil that makes each layer on the PCB plate 15 is coupled together by the magnetic core of closure.
Fig. 3 has represented the shape of magnetic core of the present invention.The present invention adopts is CI magnetic core in the insert plate, and do not have to adopt the EI magnetic core integrally cover on the plank, because such small volume, and conveniently power section and the signal section of circuit on the plate are kept apart, avoid producing and disturb, especially avoid the larger power section of voltage and current to the interference of signal section, signal circuit can be worked, produced correct control signal.Fig. 3 has also represented to have great circle and two kinds of canoes of ringlet.Coil 12 and 13 among ringlet such as Fig. 3; Coil 14 among great circle such as Fig. 3.
Fig. 2 has represented the shape of PCB plate of the present invention.Two magnetic cores of the present invention, the first magnetic core 10 and the second magnetic core 11, about to placement, laterally be arranged on the PCB plate 15.Core post is transversely arranged, and the upper core post of the upper core post of the first magnetic core 10 and the second magnetic core 11 is positioned at a horizontally-arranged, and the lower core post of the lower core post of the first magnetic core 10 and the second magnetic core 11 is positioned at a horizontally-arranged.PCB plate 15 the first half are power circuits, and the latter half is signal circuit.The winding of through-put power is all on superincumbent core post, and the winding of signal transmission just is wrapped on the following core post.
Magnetic core can use the manganese-zinc ferrite manufacturing, also can be according to the specific requirement of the indexs such as magnetic permeability, saturation flux density by the other materials manufacturing.Magnetic core sticking and locate to leave certain air gap.Transformer primary side and secondary inductance value that can be required according to circuit determine bonding tightness degree.
The PCB plate that uses among the present invention is the PCB plate of multilayer, and the concrete number of plies is determined by needs.The layer with the layer spacing than hour, leakage inductance is less but parasitic capacitance is larger, insulating properties is also poor; The spacing of layer and layer is when larger, good insulating, and parasitic capacitance is little and leakage inductance is larger, so must select preferably interlamellar spacing (such as 100um).Because the electric current that bears is larger, the thickness that covers copper on the plank is wanted enough (such as 100um), can not be too little; And owing to the caloric value of PCB plate under the large electric current is larger, preferably select the good or resistant to elevated temperatures PCB plate material of thermal conductivity (such as high Tg170).
The pattern of the conductive coil of each winding must center on the hole to be arranged, interconnected by via hole, forms closed loop.The pattern of conductive coil can be rectangle, shown in Fig. 3, also can be other shapes.Be used for the former limit winding of through-put power and each layer of secondary power winding conductive pattern want broadly similar, the width that covers copper must wider (such as 70mil), could satisfy like this needs that pass through large electric current.Only around the latter half of one of them magnetic core, its cabling can be thinner usually for secondary signal winding.
In order to reduce to disturb and ghost effect, the winding of various different in kinds usually circulation is staggered, and is distant to guarantee that connatural winding is separated by.For example in this example, the great circle of the first coil 1 is positioned at second, layer 6, and ringlet is at the tenth layer of wounded core 10; The great circle of the second coil 2 is positioned at the 4th, eight layer, and ringlet is at the tenth layer of wounded core 11; The first secondary power winding 3, the 3rd secondary power winding 5 respectively around first, the 5th, the 9th, the magnetic core 10 of Floor 12 and the upper core post of magnetic core 11; The second secondary power winding 4, fourth officer limit power winding 6 respectively around the 3rd, the 7th, the magnetic core 10 of eleventh floor and the upper core post of magnetic core 11; First signal winding 7, secondary signal winding 8 are respectively around the lower core post of the 13 layer magnetic core 10 and magnetic core 11.
The turn ratio of flat surface transformer is set by the coil turn of setting former limit and secondary.For example in this example, by top narration as can be known, around 5 weeks, around 1 week, turn ratio is 5: 1 to the total current in parallel of secondary to the electric current on former limit in the upper core post of each magnetic core in the upper core post of each magnetic core.Also can set as required other turn ratio.
Transformer in this example, can regard a transformer that is formed by the first magnetic core 10 and the first coil 1, the first secondary power winding 3, the second secondary power winding 4, first signal winding 7 as, another transformer that forms with the second magnetic core 11, the second coil 2, the 3rd secondary power winding 5, fourth officer limit power winding 6, series connection and the first secondary power winding 3, the second secondary power winding 4, the 3rd secondary power winding 5, the 3rd secondary power winding 6 by the first coil 1 and the second coil 2 are connected to a little flat surface transformers of 9 formations jointly.The first secondary power winding 3 and the second secondary power winding 4 can be considered as a winding, and the 3rd secondary power winding 5 and the 3rd secondary power winding 6 can be considered as a winding, and point 9 is centre caps.
By above-mentioned design, the flat surface transformer in this example has been realized the electric current output of 25A on the area of the size of two transversely arranged 30mm of each transformation 15mm * 6mm(* 6mm), and highly very little, less than 6.5mm.
Need to prove, in this article, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby not only comprise which key element so that comprise process, method, article or the equipment of a series of key elements, but also comprise other key elements of clearly not listing, or also be included as the intrinsic key element of this process, method, article or equipment.In the situation that not more restrictions, the key element that is limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises key element and also have other identical element.
Used specific case herein principle of the present utility model and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present utility model and core concept thereof.The above only is preferred implementation of the present utility model, should be understood that, because the finiteness of literal expression, and objectively there is unlimited concrete structure, for those skilled in the art, under the prerequisite that does not break away from the utility model principle, can also make some improvement, retouching or variation, also above-mentioned technical characterictic can be made up by rights; These improve retouching, change or combination, or without improving the design of utility model and technical scheme are directly applied to other occasion, all should be considered as protection range of the present utility model.
Claims (4)
1. large current plane transformer that is produced on the printed circuit board (PCB), comprise magnetic core and winding, it is characterized in that: described magnetic core comprises two the first identical shaped magnetic cores and the second magnetic core, described the first magnetic core and the second magnetic core include two core post and two bottom surfaces, two core post are vertical with two bottom surfaces, accompany the multi-layer PCB plate between two bottom surfaces, two core post are passed respectively the through hole on the multi-layer PCB plate; Place about described the first magnetic core and the second magnetic core, core post is transversely arranged, and the upper core post of the first magnetic core and the upper core post of the second magnetic core are positioned at a horizontally-arranged, and the lower core post of the first magnetic core and the lower core post of the second magnetic core are positioned at a horizontally-arranged;
Described winding is the coil that is printed on the multi-layer PCB plate, and described winding comprises former limit winding and secondary power winding; Former limit winding is comprised of two coils, and around the upper core post of the first magnetic core and the second magnetic core, other numbers of turn are around the upper core post of the first magnetic core or the second magnetic core simultaneously for these two coils some numbers of turn wherein, and two coils must be in parallel when using; Secondary power winding has four groups, comprise that the first secondary power is around, the second secondary power winding, the 3rd secondary power winding and fourth officer limit power winding, wherein the first secondary power winding and the second secondary power winding are around the upper core post of the first magnetic core, and the 3rd secondary power winding and fourth officer limit power winding are around the upper core post of the second magnetic core; The two ends of the first secondary power winding, the second secondary power winding, the 3rd secondary power winding and fourth officer limit power winding are first end and the second end, and the first end of these four windings is Same Name of Ends each other; The second end of the first end of the second end of the first secondary power winding, the second secondary power winding, the 3rd secondary power winding connects together with the first end of fourth officer limit power winding.
2. a kind of large current plane transformer that is produced on the printed circuit board (PCB) according to claim 1, the coil that it is characterized in that described winding is separately positioned on the different layer of multi-layer PCB plate, the more than one deck of the number of plies that each winding comprises, the coil of different windings is staggered at each layer of multi-layer PCB plate.
3. a kind of large current plane transformer that is produced on the printed circuit board (PCB) according to claim 1 is characterized in that described every group of secondary power winding only has the coils from parallel connection of coils of a circle to form by a plurality of.
4. a kind of large current plane transformer that is produced on the printed circuit board (PCB) according to claim 1 is characterized in that described winding also comprises secondary signal winding, and secondary signal winding is looped around the lower core post of the first magnetic core or the lower core post of the second magnetic core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320237214 CN203205229U (en) | 2013-05-06 | 2013-05-06 | Large-current planar transformer manufactured on printed circuit board |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320237214 CN203205229U (en) | 2013-05-06 | 2013-05-06 | Large-current planar transformer manufactured on printed circuit board |
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| CN203205229U true CN203205229U (en) | 2013-09-18 |
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| CN 201320237214 Expired - Lifetime CN203205229U (en) | 2013-05-06 | 2013-05-06 | Large-current planar transformer manufactured on printed circuit board |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103903835A (en) * | 2014-04-16 | 2014-07-02 | 东莞铭普光磁股份有限公司 | Transformer |
| CN105869855A (en) * | 2016-05-20 | 2016-08-17 | 浙江求缺科技有限公司 | Planar transformer with double-column magnetic core structure |
| CN107437885A (en) * | 2016-05-25 | 2017-12-05 | 台达电子企业管理（上海）有限公司 | Power module and supply unit |
| CN108461260A (en) * | 2018-02-06 | 2018-08-28 | 福建睿能科技股份有限公司 | The matched transformer of secondary windings leakage inductance and multiple-channel output resonant transform circuit |
| CN112104202A (en) * | 2020-02-27 | 2020-12-18 | 台达电子工业股份有限公司 | Power supply module |
| CN112117102A (en) * | 2019-06-19 | 2020-12-22 | 特变电工智能电气有限责任公司 | Split coil structure and transformer |
| WO2023222290A1 (en) * | 2022-05-18 | 2023-11-23 | Biotronik Se & Co. Kg | A planar transformer assembly, an implantable medical device comprising a planar transformer assembly, and a method for fabricating a planar transformer assembly |
| US11901108B2 (en) | 2016-05-25 | 2024-02-13 | Delta Electronics (Shanghai) Co., Ltd. | Power module and power device |
-
2013
- 2013-05-06 CN CN 201320237214 patent/CN203205229U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103903835A (en) * | 2014-04-16 | 2014-07-02 | 东莞铭普光磁股份有限公司 | Transformer |
| CN103903835B (en) * | 2014-04-16 | 2016-08-17 | 东莞铭普光磁股份有限公司 | A kind of transformator |
| CN105869855A (en) * | 2016-05-20 | 2016-08-17 | 浙江求缺科技有限公司 | Planar transformer with double-column magnetic core structure |
| CN107437885A (en) * | 2016-05-25 | 2017-12-05 | 台达电子企业管理（上海）有限公司 | Power module and supply unit |
| US10847455B2 (en) | 2016-05-25 | 2020-11-24 | Delta Electronics (Shanghai) Co., Ltd | Power module and power device |
| US11901108B2 (en) | 2016-05-25 | 2024-02-13 | Delta Electronics (Shanghai) Co., Ltd. | Power module and power device |
| CN108461260A (en) * | 2018-02-06 | 2018-08-28 | 福建睿能科技股份有限公司 | The matched transformer of secondary windings leakage inductance and multiple-channel output resonant transform circuit |
| CN112117102A (en) * | 2019-06-19 | 2020-12-22 | 特变电工智能电气有限责任公司 | Split coil structure and transformer |
| CN112104202A (en) * | 2020-02-27 | 2020-12-18 | 台达电子工业股份有限公司 | Power supply module |
| WO2023222290A1 (en) * | 2022-05-18 | 2023-11-23 | Biotronik Se & Co. Kg | A planar transformer assembly, an implantable medical device comprising a planar transformer assembly, and a method for fabricating a planar transformer assembly |
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Effective date of registration: 20220505 Address after: 410000 room 1002-1010, 10th floor, headquarters building, Changsha Zhongdian Software Park, No. 39 Jianshan Road, Changsha high tech Development Zone, Changsha, Hunan Patentee after: HUNAN JINXIN ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: 410000 room 7, floor 6, Luhua Microelectronics R & D building, No. 229, tongzipo West Road, high tech Development Zone, Changsha, Hunan Patentee before: Yi Feng |
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Granted publication date: 20130918 |
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