CN103956913A - High-power full-water-cooling synchronous rectification structure - Google Patents
High-power full-water-cooling synchronous rectification structure Download PDFInfo
- Publication number
- CN103956913A CN103956913A CN201410135045.XA CN201410135045A CN103956913A CN 103956913 A CN103956913 A CN 103956913A CN 201410135045 A CN201410135045 A CN 201410135045A CN 103956913 A CN103956913 A CN 103956913A
- Authority
- CN
- China
- Prior art keywords
- substrate
- pedestal
- center pillar
- power
- source electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Rectifiers (AREA)
Abstract
The invention discloses a high-power full-water-cooling synchronous rectification structure. The structure comprises a first copper plate, a second copper plate, a high-frequency power transformer and a secondary side synchronous rectification module. The high-frequency power transformer comprises a base body, a substrate, transformer magnetic cores and transformer primary side windings. The base body is electrically connected with the substrate to form central taps of secondary side windings. The secondary side synchronous rectification module comprises a drain electrode substrate, a first source electrode connecting plate, a second source electrode connecting plate and power MOS tube sets. The two ends of the first copper plate are connected to a center pillar of the base body and the second source electrode connecting plate respectively. The two ends of the second copper plate are connected to a center pillar of the substrate and the first source electrode connecting plate respectively. The first source electrode connecting plate and the second source electrode connecting plate are connected with source electrodes of the power MOS tube sets. The drain electrode substrate is connected with drain electrodes of the power MOS tube sets to serve as power source positive electrodes. Cooling water channels are formed in the high-frequency power transformer and the secondary side synchronous rectification module. The high-power full-water-cooling synchronous rectification structure is compact in structure and good in heat dissipation effect, large-current output is easy to achieve, and output power can be adjusted as needed.
Description
Technical field
The present invention relates to synchronous rectification field, be specifically related to a kind of high-power full water cooling synchronous rectification structure.
Background technology
Low-voltage, high-current technology is applied more and more in high frequency industrial power, to the modularized design of high frequency industrial power, and the power density of power supply, the reliability requirement of power supply is also more and more higher.If power supply architecture design words improperly, not only the production cycle long, cost is high, and likely causes fault because of excess Temperature, electromagnetic interference etc. when power supply operation.Therefore, the quality of power supply architecture design directly has influence on the competitiveness of product.
In commercial Application power supply, conventional transformer rectifier circuit structure has bridge rectifier, full-wave rectifying circuit and half-wave rectifying circuit.Along with the development of synchronous rectification, low-voltage, high-current high frequency switch power adopts all-wave circuit of synchronous rectification mostly, but, when secondary side current grade reaches thousands of ampere-hours, because all-wave circuit of synchronous rectification needs two secondary winding, and the rectifying tube of each secondary winding is made up of several power MOS pipes, form two secondary winding and circuit of synchronous rectification, its complex structure, technological requirement is high, difficulty is large, design bad meeting and cause transformer heating, power MOS pipe control difficulty, device easily damages, and whole aircraft reliability is declined.Meanwhile, the power requirement different according to man of manufacturer, need design simple in structure, the adjustable power supply architecture of power.The present invention is directed to this problem, designed this high-power full water cooling synchronous rectification structure.
Summary of the invention
Technical problem to be solved by this invention, the object of the invention is the high-power full water cooling synchronous rectification of open one structure.
The present invention is for addressing the above problem, and the technical scheme adopting is as follows:
Described high-power full water cooling synchronous rectification structure comprises the first copper coin, the second copper coin, high-frequency power transformer and secondary synchronous rectification module.
Described high-frequency power transformer is made up of pedestal, substrate, magnetic core of transformer, transformer primary side winding, it is characterized in that: described pedestal has boring structure, this pedestal is cuboid conductor material, cuboid one side center has annular groove, the mid portion of described annular groove is as pedestal center pillar, this pedestal center pillar is that the part of being dissectd extends to the bottom surface of cuboid always along the remaining half of cylinder center longitudinally cutting, and forms described pedestal window in this bottom surface; Described transformer primary side winding is around on magnetic core of transformer by multiply enamelled wire uniform ring, and annular groove size is wound with the magnetic core of transformer of former limit winding described in be able to putting into; Described substrate is an electric conducting material, the one side center of substrate is connected with substrate center pillar, this substrate center pillar is along the remaining half of cylinder center longitudinally cutting, the part of being dissectd extends to the another side of substrate always, and forming described substrate window at this another side, substrate center pillar equates with the radius of pedestal center pillar; The substrate center pillar that substrate is provided with is through the pedestal window having in toroidal transformer magnetic core and pedestal, the substrate window that the pedestal center pillar being provided with in pedestal is provided with through toroidal transformer magnetic core and substrate; Substrate center pillar and pedestal center pillar form two windings of transformer secondary, the be electrically connected to form centre tap of secondary winding of pedestal and substrate.
Described secondary synchronous rectification module comprises drain electrode substrate, the first source electrode connecting plate, the second source electrode connecting plate and power MOS pipe group; The first copper coin two ends are connected to respectively pedestal center pillar and the second source electrode connecting plate, the second copper coin two ends are connected to respectively substrate center pillar and the first source electrode connecting plate, first, second source electrode connecting plate is electrically connected with the source electrode of power MOS pipe group by the pcb board driving for power ratio control metal-oxide-semiconductor, and the drain electrode of drain electrode substrate and power MOS pipe group is joined as positive source; Drain electrode substrate, the first source electrode connecting plate, the second source electrode connecting plate inside all offer the cooling-water duct of two-way internal communication along its length.
Described high-power full water cooling synchronous rectification architectural feature is, the equal wrap insulate layer in surface of pedestal center pillar and substrate center pillar, between substrate center pillar and pedestal window, be not electrically connected between pedestal center pillar and substrate window.
Described high-power full water cooling synchronous rectification architectural feature is, described pedestal one side opening is provided with the inlet opening communicating with the hollow-core construction in pedestal, pedestal center pillar longitudinally offers a road cooling-water duct along cylinder center, cooling-water duct communicates with the hollow-core construction of pedestal inside, and the delivery port of this cooling-water duct is positioned at the end face of pedestal center pillar.
Described high-power full water cooling synchronous rectification architectural feature is, power MOS pipe group is divided into four groups altogether, and the power MOS pipe number of every group equates, and the symmetrical two sides that is placed in drain electrode substrate.
Described high-power full water cooling synchronous rectification architectural feature is, power MOS pipe is encapsulated as TO-247AC.
Described high-power full water cooling synchronous rectification architectural feature is, cooling water circulates from high-frequency power transformer, the first source electrode connecting plate, drain electrode substrate, the second source electrode connecting plate successively.
Compared with prior art, tool of the present invention has the following advantages and technique effect: high-frequency power transformer of the present invention adopts unitary conductive material to form transformer secondary winding, its conductive area is more much bigger than copper bar or wire conductive cross-sectional area, and this structure can improve transformer radiating effect; Secondary synchronous rectification module adopts the source electrode of 2 blocks of electric conducting materials as power MOS pipe, 1 block of electric conducting material is as power MOS pipe group public drain electrode, this compact conformation is simple, realize High-current output very simple, both can greatly improve the heat radiation of power MOS pipe, also for quantity adjustment and the driving control of power MOS pipe are provided convenience.Overall structure of the present invention has all added water-cooling pattern, and radiating effect further improves, and is particularly suitable for large-power occasions, has very high reliability.
Brief description of the drawings
Fig. 1 is high-frequency power transformer structural representation;
Fig. 2 is the base structure schematic diagram in Fig. 1;
Fig. 3 is the board structure schematic diagram in Fig. 1;
Fig. 4 is the toroidal core schematic diagram with former limit winding in Fig. 1;
Fig. 5 is secondary synchronous rectification modular structure schematic diagram;
Fig. 6 is the high-power full water cooling synchronous rectification structural representation of execution mode;
In figure: 1. pedestal, 2. annular groove, 3. pedestal center pillar, 4. pedestal window, 5. substrate, 6. substrate center pillar, 7. substrate window, 8. toroidal transformer magnetic core, 9. transformer primary side winding, 10. delivery port, 11 water inlets, 12. drain electrode substrates, 13. first source electrode connecting plates, 14. second source electrode connecting plates, 15. power MOS pipe groups, 16. cooling-water ducts, 17. first copper coins, 18. second copper coins.
Embodiment
Below in conjunction with accompanying drawing and concrete enforcement, the present invention is further described in detail.
With reference to accompanying drawing 1,2,3,4, transformer of the present invention comprises pedestal 1, annular groove 2, pedestal center pillar 3, pedestal window 4, substrate 5, substrate center pillar 6, substrate window 7, magnetic core of transformer 8, former limit winding 9, delivery port 10, water inlet 11.Pedestal 1 has boring structure, this pedestal is cuboid conductor material, cuboid one side center has annular groove 2, the mid portion of described annular groove is as pedestal center pillar 3, this pedestal center pillar is along the remaining half of cylinder center longitudinally cutting, the part of being dissectd extends to the bottom surface of cuboid always, and forms described pedestal window 4 in this bottom surface; Described transformer primary side winding 9 is around on magnetic core of transformer 8 by multiply enamelled wire uniform ring, and annular groove size is wound with the magnetic core of transformer of former limit winding described in be able to putting into; Described substrate 5 is an electric conducting material, the one side center of substrate is connected with substrate center pillar 6, this substrate center pillar is along the remaining half of cylinder center longitudinally cutting, the part of being dissectd extends to the another side of substrate always, and forming described substrate window 7 at this another side, substrate center pillar 6 equates with the radius of pedestal center pillar 3; Substrate center pillar that substrate is provided with 6 is through the pedestal window 4 having in toroidal transformer magnetic core 8 and pedestal, the substrate window 7 that the pedestal center pillar 3 being provided with in pedestal is provided with through toroidal transformer magnetic core 8 and substrate; Substrate center pillar 6 and pedestal center pillar 3 form two windings of transformer secondary, the be electrically connected to form centre tap of secondary winding of pedestal 1 and substrate 5.
The pedestal of described high frequency transformer is realized High-current output because conductive area is large very simple, is particularly suitable for large current applications.
The equal wrap insulate layer in surface of described pedestal center pillar 3 and substrate center pillar 6, between substrate center pillar 6 and pedestal window 4, be not electrically connected between pedestal center pillar 3 and substrate window 7.
Described pedestal 1 inside is hollow-core construction, and pedestal one side opening is provided with the inlet opening 11 communicating with this hollow-core construction, pedestal center pillar longitudinally offers a road cooling-water duct along cylinder center, cooling-water duct communicates with the hollow-core construction of pedestal inside, and the delivery port 10 of this cooling-water duct is positioned at the end face of pedestal center pillar.
With reference to accompanying drawing 5 and accompanying drawing 6, secondary synchronous rectification module of the present invention comprises drain electrode substrate 12, the first source electrode connecting plate 13, the second source electrode connecting plate 14 and power MOS pipe group 15.The first copper coin 17 two ends are connected to respectively pedestal center pillar 3 and the second source electrode connecting plate 14, the second copper coin 18 two ends are connected to respectively substrate center pillar 6 and the first source electrode connecting plate 13, first, second source electrode connecting plate is electrically connected with the source electrode of power MOS pipe group 15 by the pcb board driving for power ratio control metal-oxide-semiconductor, and drain electrode substrate 12 joins as positive source with the drain electrode of power MOS pipe group 15; Drain electrode substrate 12, the first source electrode connecting plate 13, the second source electrode connecting plate 14 inside all offer the cooling-water duct 16 of two-way internal communication along its length.
Described power MOS pipe group 15 is divided into four groups altogether, respectively first group of rectifying tube, second group of rectifying tube, the 3rd group of rectifying tube, the 4th group of rectifying tube, the power MOS pipe number of every group equates and the symmetrical two sides being placed at drain electrode substrate 12, the drain electrode of the power MOS pipe of every group is all electrically connected with drain electrode substrate, the source electrode of first group of rectifying tube and second group of rectifying tube is electrically connected with the first source electrode connecting plate 13 by two pcb boards that drive for power ratio control metal-oxide-semiconductor respectively, the source electrode of the 3rd group of rectifying tube and the 4th group of rectifying tube is electrically connected with the second source electrode connecting plate 14 by other two pcb boards that drive for power ratio control metal-oxide-semiconductor respectively, distribute power MOS pipe according to output current grade.
Described power MOS pipe is encapsulated as TO-247AC.
Described high-power full water cooling synchronous rectification structure cooling water circulates from high-frequency power transformer, the first source electrode connecting plate, drain electrode substrate, the second source electrode connecting plate successively, radiating effect improves greatly, very easily realize High-current output, be specially adapted to large-power occasions.
With reference to accompanying drawing 6, the high-power full water cooling synchronous rectification of the present invention structure comprises the first copper coin 17, the second copper coin 18, high-frequency power transformer (1 ~ 11) and secondary synchronous rectification module (12 ~ 16).High-frequency power transformer is electrically connected with secondary synchronous rectification module by the first copper coin 17, the second copper coin 18.
Described high-power full water cooling synchronous rectification structure is a kind of modular Integral design, the drain electrode substrate of secondary synchronous rectification module forms the positive pole of output direct current, high-frequency power transformer pedestal and substrate form the negative pole of output direct current, are conducive to the convenient of practice and connect.This structural design mode is not only convenient aspect commercial Application, and is conducive to the heat radiation of transformer and power MOS pipe, drives control to facilitate and there is good effect anti-electromagnetic interference aspect for power MOS pipe.
High-frequency power transformer of the present invention is divided into different capacity grade, secondary synchronous rectification module is divided into different current classes by the difference of output current, and power output, the output current requiring according to man of manufacturer chooses the high-frequency power transformer of different capacity grade and the synchronous rectification module of different current classes is combined into required high frequency industrial power.
Those skilled in the art can make various amendments to this specific embodiment or supplement or adopt similar mode to substitute under the prerequisite without prejudice to principle of the present invention and essence, but these changes all fall into protection scope of the present invention.Therefore the technology of the present invention scope is not limited to above-described embodiment.
Claims (6)
1. a high-power full water cooling synchronous rectification structure, comprises the first copper coin, the second copper coin, high-frequency power transformer and secondary synchronous rectification module; Described high-frequency power transformer is made up of pedestal, substrate, magnetic core of transformer, transformer primary side winding, it is characterized in that: described pedestal has boring structure, this pedestal is cuboid conductor material, cuboid one side center has annular groove, the mid portion of described annular groove is as pedestal center pillar, this pedestal center pillar is that the part of being dissectd extends to the bottom surface of cuboid always along the remaining half of cylinder center longitudinally cutting, and forms described pedestal window in this bottom surface; Described transformer primary side winding is around on magnetic core of transformer by multiply enamelled wire uniform ring, and annular groove size is wound with the magnetic core of transformer of former limit winding described in be able to putting into; Described substrate is an electric conducting material, the one side center of substrate is connected with substrate center pillar, this substrate center pillar is along the remaining half of cylinder center longitudinally cutting, the part of being dissectd extends to the another side of substrate always, and forming described substrate window at this another side, substrate center pillar equates with the radius of pedestal center pillar; The substrate center pillar that substrate is provided with is through the pedestal window having in toroidal transformer magnetic core and pedestal, the substrate window that the pedestal center pillar being provided with in pedestal is provided with through toroidal transformer magnetic core and substrate; Substrate center pillar and pedestal center pillar form two windings of transformer secondary, the be electrically connected to form centre tap of secondary winding of pedestal and substrate;
Described secondary synchronous rectification module comprises drain electrode substrate, the first source electrode connecting plate, the second source electrode connecting plate and power MOS pipe group; The first copper coin two ends are connected to respectively pedestal center pillar and the second source electrode connecting plate, the second copper coin two ends are connected to respectively substrate center pillar and the first source electrode connecting plate, first, second source electrode connecting plate is electrically connected with the source electrode of power MOS pipe group by the pcb board driving for power ratio control metal-oxide-semiconductor, and the drain electrode of drain electrode substrate and power MOS pipe group is joined as positive source; Drain electrode substrate, the first source electrode connecting plate, the second source electrode connecting plate inside all offer the cooling-water duct of two-way internal communication along its length.
2. high-power full water cooling synchronous rectification structure according to claim 1, is characterized in that, the equal wrap insulate layer in surface of described pedestal center pillar and substrate center pillar, between substrate center pillar and pedestal window, be not electrically connected between pedestal center pillar and substrate window.
3. high-power full water cooling synchronous rectification structure according to claim 1, it is characterized in that, pedestal one side opening is provided with the inlet opening communicating with the hollow-core construction of pedestal, pedestal center pillar longitudinally offers a road cooling-water duct along cylinder center, cooling-water duct communicates with the hollow-core construction of pedestal inside, and the delivery port of this cooling-water duct is positioned at the end face of pedestal center pillar.
4. high-power full water cooling synchronous rectification structure according to claim 1, is characterized in that, described power MOS pipe group is divided into four groups altogether, and the power MOS pipe number of every group equates, and the symmetrical two sides that is placed in drain electrode substrate.
5. high-power full water cooling synchronous rectification structure according to claim 1, is characterized in that, described power MOS pipe is encapsulated as TO-247AC.
6. high-power full water cooling synchronous rectification structure according to claim 1, is characterized in that, cooling water circulates from high-frequency power transformer, the first source electrode connecting plate, drain electrode substrate, the second source electrode connecting plate successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410135045.XA CN103956913A (en) | 2014-04-04 | 2014-04-04 | High-power full-water-cooling synchronous rectification structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410135045.XA CN103956913A (en) | 2014-04-04 | 2014-04-04 | High-power full-water-cooling synchronous rectification structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103956913A true CN103956913A (en) | 2014-07-30 |
Family
ID=51334156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410135045.XA Pending CN103956913A (en) | 2014-04-04 | 2014-04-04 | High-power full-water-cooling synchronous rectification structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103956913A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104575991A (en) * | 2015-01-13 | 2015-04-29 | 黄志峰 | High frequency water-cooled transformer |
| CN106328346A (en) * | 2015-07-01 | 2017-01-11 | 北京京仪椿树整流器有限责任公司 | Low-voltage heavy-current ultracrystalline high-frequency transformer |
| CN106783079A (en) * | 2017-01-19 | 2017-05-31 | 中山市鑫中亚电源科技有限公司 | A kind of rectifier transformer |
| CN106783073A (en) * | 2016-12-22 | 2017-05-31 | 中山市科雄电源科技有限公司 | A kind of new full-bridge transformer |
| KR20190016741A (en) * | 2017-08-09 | 2019-02-19 | (주) 구수중전기 | High Frequency Switching High Efficiency Transformer and Manufacturing Method for the Same |
| CN109546780A (en) * | 2018-05-14 | 2019-03-29 | 滨州学院 | A kind of engineering car permanent magneto cooling with three-level |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202632963U (en) * | 2011-06-08 | 2012-12-26 | 深圳市鸿栢科技实业有限公司 | Water-cooled sub-high frequency transformer and radiation device for same |
| WO2013063627A1 (en) * | 2011-10-31 | 2013-05-10 | Fronius International Gmbh | Current source and method for cooling such a current source |
| CN103366933A (en) * | 2013-07-31 | 2013-10-23 | 华南理工大学 | Integrated high-frequency power transformer |
| CN203827201U (en) * | 2014-04-04 | 2014-09-10 | 华南理工大学 | Large power full water cooling synchronous rectifier structure |
-
2014
- 2014-04-04 CN CN201410135045.XA patent/CN103956913A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202632963U (en) * | 2011-06-08 | 2012-12-26 | 深圳市鸿栢科技实业有限公司 | Water-cooled sub-high frequency transformer and radiation device for same |
| WO2013063627A1 (en) * | 2011-10-31 | 2013-05-10 | Fronius International Gmbh | Current source and method for cooling such a current source |
| CN103366933A (en) * | 2013-07-31 | 2013-10-23 | 华南理工大学 | Integrated high-frequency power transformer |
| CN203827201U (en) * | 2014-04-04 | 2014-09-10 | 华南理工大学 | Large power full water cooling synchronous rectifier structure |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104575991A (en) * | 2015-01-13 | 2015-04-29 | 黄志峰 | High frequency water-cooled transformer |
| CN106328346A (en) * | 2015-07-01 | 2017-01-11 | 北京京仪椿树整流器有限责任公司 | Low-voltage heavy-current ultracrystalline high-frequency transformer |
| CN106328346B (en) * | 2015-07-01 | 2018-02-09 | 北京京仪椿树整流器有限责任公司 | A kind of low-voltage, high-current ultracrystallite high frequency transformer |
| CN106783073A (en) * | 2016-12-22 | 2017-05-31 | 中山市科雄电源科技有限公司 | A kind of new full-bridge transformer |
| CN106783079A (en) * | 2017-01-19 | 2017-05-31 | 中山市鑫中亚电源科技有限公司 | A kind of rectifier transformer |
| KR20190016741A (en) * | 2017-08-09 | 2019-02-19 | (주) 구수중전기 | High Frequency Switching High Efficiency Transformer and Manufacturing Method for the Same |
| KR101962374B1 (en) * | 2017-08-09 | 2019-03-26 | (주) 구수중전기 | High Frequency Switching High Efficiency Transformer and Manufacturing Method for the Same |
| CN109546780A (en) * | 2018-05-14 | 2019-03-29 | 滨州学院 | A kind of engineering car permanent magneto cooling with three-level |
| CN109546780B (en) * | 2018-05-14 | 2023-06-09 | 滨州学院 | Permanent magnet generator with three-stage cooling for engineering vehicle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103956913A (en) | High-power full-water-cooling synchronous rectification structure | |
| US7872560B2 (en) | Independent planar transformer | |
| CN208386458U (en) | Drive motor controller and electric car | |
| EP2551861B1 (en) | Resistance welding high frequency transformer and spot welding machine | |
| CN206976152U (en) | A kind of E magnetic cores parallel combination type flat surface transformer | |
| CN103366933B (en) | A kind of integral high frequency power transformer | |
| CN102956350A (en) | Integrated high-frequency power transformer | |
| CN203827201U (en) | Large power full water cooling synchronous rectifier structure | |
| CN112820515A (en) | Power supply device for low-voltage large current | |
| CN204066973U (en) | Flat surface transformer | |
| CN215356681U (en) | Low-voltage high-current welding power supply device | |
| CN103973133A (en) | Full-water-cooling high-frequency power transformer and secondary rectifying module structure | |
| CN203366967U (en) | Integrated high-frequency power transformer | |
| CN203760299U (en) | Transformer of inverter welding machine | |
| CN211628820U (en) | High-frequency high-voltage high-power transformer | |
| CN210403472U (en) | Split-phase copper plate structure for transformer | |
| EP1973124B1 (en) | Independent planar transformer | |
| CN203950638U (en) | A kind of medium-high frequency induction heating transformer | |
| CN209804417U (en) | High-frequency transformer | |
| CN208796794U (en) | A kind of miniaturization high-power transformer component | |
| CN107276428B (en) | Low-voltage high-current switching power supply structure | |
| CN207367757U (en) | A kind of transformer suitable for stage lighting power supply | |
| CN106449047B (en) | Heavy-current planar transformer and preparation method thereof | |
| CN106373733B (en) | A kind of adjustable flat surface transformer and its manufacture method | |
| CN205680520U (en) | A kind of high frequency transformer and the module of composition thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140730 |