CN1295720C - Voltage transformer arrangement - Google Patents
Voltage transformer arrangement Download PDFInfo
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- CN1295720C CN1295720C CNB2004100015910A CN200410001591A CN1295720C CN 1295720 C CN1295720 C CN 1295720C CN B2004100015910 A CNB2004100015910 A CN B2004100015910A CN 200410001591 A CN200410001591 A CN 200410001591A CN 1295720 C CN1295720 C CN 1295720C
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- 238000004804 winding Methods 0.000 claims abstract description 173
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000005096 rolling process Methods 0.000 claims description 43
- 238000005253 cladding Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 239000002390 adhesive tape Substances 0.000 description 27
- 230000008878 coupling Effects 0.000 description 10
- 238000010168 coupling process Methods 0.000 description 10
- 238000005859 coupling reaction Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000011469 building brick Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
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Abstract
The present invention relates to a transformer structure which comprises a primary winding wire, a secondary winding wire, a module of a winding-wire frame and an iron core group, wherein the iron core group is arranged in the module of a winding-wire frame, and the module of a winding-wire frame comprises a first winding-wire component and a second winding-wire component; the first winding-wire component is used for winding the primary winding wire, and the second winding-wire component is used for winding the secondary winding wire; the first winding-wire component and the second winding-wire component respectively has a first side plate; the first winding-wire component and the second winding-wire component are isolated from or connected with each other by the first side plates, and the primary winding wire and the secondary winding wire are separated from each other so as to increase leakage inductance and electric safety distance. Thus, the transformer structure has the advantages of simplicity, improved electric safety and labor and manufacturing cost saving.
Description
Technical field
The present invention is about a kind of transformer (transformer) structure, refer to a kind ofly to increase leakage inductance (leakage inductance) especially, improve electrical security, simple in structure, can save the transformer device structure of built-up time, assembling manpower and manufacturing cost.
Background technology
Transformer is the electronic building brick that often uses in the various electric equipment.See also Fig. 1, it is the structural representation of a traditional transformer.As shown in Figure 1, this transformer 1 mainly comprises group 11 (magnetic core assembly) unshakable in one's determination, a winding base 12 (bobbin), an elementary coiling 13 (primarywinding coil) and level coiling 14 (secondary winding coil) etc.Wherein, elementary coiling 13 and secondary rolling thread about in the of 14 lap wound in the winding region of winding base 12, and with an adhesive tape 15 (tape) separation insulated from each other.Group 11 unshakable in one's determination is generally the EE sections heart (EE-core), the EI sections heart (EI-core) or the ER sections heart (ER-core), it can be arranged on axle center 111 in the sleeve pipe 121 of winding base 12, make group 11 unshakable in one's determination and elementary coiling 13 and secondary rolling thread 14 produce the inductance coupling induction, to reach the purpose of voltage transitions.
The control of transformer leakage inductance (leakage inductance) is very important to power supply changeover device, because it will have influence on the power conversion efficiency of power supply changeover device.For improving the power conversion efficiency of power supply changeover device, correlation technique has been devoted to increase the coupling efficiency of transformer coiling, reduces leakage inductance, and then reduces the energy loss of voltage transitions.In transformer device structure shown in Figure 1, since elementary coiling 13 and secondary rolling thread about in the of 14 lap wound in the winding region of winding base 12, therefore elementary coiling 13 forms less magnetic leakage with secondary rolling thread 14, coiling coupling efficiency (coupling coefficient) increases, leakage inductance reduces, energy loss through the transformer changing voltage is less, can improve the power conversion efficiency of power supply changeover device thus.
Yet in the power system of electronic products of new generation such as LCD TV, transformer is a main flow with the transformer of tool leakage inductance type.The LC resonant circuit that the electric current of power system can be earlier constituted through the intrinsic leakage inductance L of a transformer primary and a capacitance component C; Simultaneously, the electric current that is similar to half sine wave can pass through power field effect transistor switch.When electric current was zero, switch was conducting, and when returning zero through half sinusoidal wave after-current, switch will cut out.Adopt the soft switch designs of this tool resonant circuit, can reduce the switching loss and reduction noise of switch module.
The mode that increases transformer leakage inductance has many kinds, and it mainly is that the main coiling is separated a specific range with secondary rolling thread, reduces the coiling coupling efficiency, to increase the leakage inductance of transformer.See also Fig. 2, it is the structural representation of a traditional tool leakage inductance type transformer.As shown in Figure 2, this transformer 2 comprises a winding base 21,22, level coilings of main coiling, 23 and one adhesive tape 24, and wherein this winding base 21 has one first side plate 211, one second side plate 212 and winding section 213.Adhesive tape 24 is wound in central in fact position, winding section 213 and has a width d, winding section 213 is divided into one first winding region 2131 and one second winding region 2132.Main coiling 22 is wound in respectively in first winding region 2131 and second winding region 2132 with secondary rolling thread 23, and respectively separately with one first side adhesive tape 25 and one second side adhesive tape 26 and first side plate 211 and second side plate 212, separation by adhesive tape 24 can make between main coiling 22 and the secondary rolling thread 23 and keep certain electrical safety distance, in addition by the first side adhesive tape 25 and the second side adhesive tape 26 can make wind the line 22,23 and the external conductive thing between also can keep meeting the electrical safety distance of electrical safety.In addition, the adhesive tape 24 width d that main coiling 22 and secondary rolling thread are 23 are wide more, and then representative coiling coupling efficiency reduces, and leakage inductance increases, and this will help the control of resonant circuit in the power system.
Yet,, still have many problems though said structure can increase leakage inductance.For example, the size of leakage inductance depends on the width d of main coiling 22 and 23 adhesive tapes 24 of secondary rolling thread, because adhesive tape 24 is soft materials and can't be completely fixed, therefore structure is comparatively loose and easily be shifted because of using for a long time or shaking, cause the leakage inductance value to reduce or instability, and then have influence on the resonant circuit control of power system.In addition, do separator to keep the mode of electrical safety distance with adhesive tape 24, the first side adhesive tape 25 and the second side adhesive tape 26, need manually to carry out the action that adhesive tape twines in a large number, because adhesive tape has stickiness and width is again little, therefore it is not only time-consuming but also loaded down with trivial details to add man-hour, cause production capacity to improve, take manpower and cost on foot.And, also may be because of the not good quality that has influence on transformer of the winding of adhesive tape.
In addition, owing to need to twine adhesive tape 24, the first side adhesive tape 25 and the second side adhesive tape 26, area and the volume that main coiling 22 and secondary rolling thread 23 can be twined in the winding section 213 reduced, and then have influence on the usefulness of heat radiation in the winding section 213 of winding base 21.In addition, transformer can in that main coiling 22 and secondary rolling thread 23 outer be covered with one layer tape insulation after the adhesive tape step is finished in coiling with twining again, and so also makes the heats of coiling 22,23 generations be difficult for leaving easily.And the fusing point of adhesive tape 24 is lower, and therefore the Operating Temperature Limit value of whole transformer just is subjected to the fusing point restriction of adhesive tape 24, causes transformer application limited.
Therefore, how to develop a kind of shortcoming of improving the known transformer structure, and can effectively control with increase leakage inductance, improve electrical security, simple in structure, can simplify processing procedure, save transformer device structure artificial and cost, real is the problem that presses for solution at present.
Summary of the invention
Main purpose of the present invention is to provide a kind of transformer device structure, wind the line coupling efficiency and increase leakage inductance to reduce with secondary rolling thread by separating the main coiling, and make transformer device structure simple, electrical security be can improve, simplify the processing procedure program, artificial and manufacturing cost saved.
For arriving above-mentioned purpose, the invention provides a kind of transformer device structure, comprising: main coiling; A level coiling; One drum stand module, it comprises one first winding part, one second winding part and a drum stand upper shield, this first winding part is used to twine this main coiling, this second winding part is used to twine this secondary rolling thread, and this drum stand upper shield is in order to cover this first winding part and this second winding part; Wherein, this first winding part and this second winding part have one first side plate respectively, and this first winding part and this second winding part make this main coiling separate mutually with this secondary rolling thread each other with its first side plate separately or be connected; And a group unshakable in one's determination, it is arranged in this drum stand module.
According to conception of the present invention, this first winding part and this second winding part are formed in one.
According to conception of the present invention, wherein this drum stand upper shield has at least two chambers, and described two chambers are relative with this first winding part and this second winding part respectively, cover this first winding part and this second winding part with cover.
According to conception of the present invention, wherein said two chambers are separated with a demarcation strip, and this demarcation strip engages and be fixed in the formed gap of first side plate of this first winding part and this second winding part.
According to conception of the present invention, wherein this drum stand module also comprises a base plate, and this base plate extends upward a fin, to engage and to be fixed in the formed gap of first side plate of this first winding part and this second winding part.
According to conception of the present invention, wherein this drum stand upper shield also comprises two openings, and it is connected with described two chambers respectively, in order to the heat that this main winds the line and secondary rolling thread is produced that dispels the heat.
According to conception of the present invention, wherein this first winding part and this second winding part have one second side plate respectively, and this first side plate of this first winding part and this second winding part and this second side plate form a winding region.
According to conception of the present invention, a lead area wherein stretches out below this second side plate.
According to conception of the present invention, wherein this lead area has several pins.
According to conception of the present invention, wherein this first winding part and this second winding part are separated, and coat this main coiling and this secondary rolling thread with a cladding material respectively.
According to conception of the present invention, wherein this first winding part and this second winding part have one second side plate respectively, and this first side plate of this first winding part and this second winding part and this second side plate form a winding region.
According to conception of the present invention, should the iron core group be the EE sections heart, the EI sections heart, the ER sections heart or the UU sections heart wherein.
Transformer device structure of the present invention is simple, can improve electrical security, simplifies the processing procedure program, save artificial and manufacturing cost.
The present invention is able to clearer understanding by the following icon and embodiment explanation.
Description of drawings
Fig. 1 is the structural representation of a traditional transformer;
Fig. 2 is the structural representation of a traditional tool leakage inductance type transformer;
Fig. 3 (a) is the first preferred embodiment structural representation of tool leakage inductance type transformer of the present invention;
Fig. 3 (b) is another preferred embodiment structural representation of tool leakage inductance type transformer of the present invention;
Fig. 4 is another preferred embodiment structural representation of tool leakage inductance type transformer of the present invention.
Wherein, description of reference numerals is as follows:
The 1-transformer; 11-group unshakable in one's determination; The 12-winding base; The elementary coiling of 13-;
The 14-secondary rolling thread; The 15-adhesive tape; The 111-axle center; The 121-sleeve pipe;
The 2-transformer; The 21-winding base; The coiling of 22-main; The 23-secondary rolling thread;
The 24-adhesive tape; The 25-first side adhesive tape; The 26-second side adhesive tape; 211-first side plate;
212-second side plate; The 213-winding section; 2131-first winding region;
2132-second winding region; The 3-transformer; 31-drum stand module;
The coiling of 32-main; The 33-secondary rolling thread; 34-group unshakable in one's determination; 311-first winding part;
312-second winding part; 313-drum stand upper shield; The 314-base plate; The 341-axle center;
First side plate of 3111-first winding part; Second side plate of 3112-first winding part;
First side plate of 3121-second winding part; Second side plate of 3122-second winding part;
The winding region of 3113-first winding part; The winding region of 3123-second winding part;
The 3131-chamber; The 3132-chamber; The 3133-dividing plate; 3134-first opening;
3135-second opening; The 3141-fin; The 4-transformer; The 41-module that winds the line;
42-group unshakable in one's determination; 411-first winding part; 412-second winding part;
The 413-cladding material; The 414-cladding material; The 421-axle center;
First side plate of 4111-first winding part; Second side plate of 4112-first winding part;
First side plate of 4121-second winding part; Second side plate of 4122-second winding part.
Embodiment
See also Fig. 3 (a), it is a preferred embodiment structural representation of tool leakage inductance type transformer of the present invention.Shown in Fig. 3 (a), transformer 3 of the present invention comprises a drum stand module 31,32, level coilings of main coiling, 33 and one group 34 unshakable in one's determination.Wherein, this drum stand module 31 has one first winding part 311, one second winding part 312 and a drum stand upper shield 313.Main coiling 32 is wound in respectively on first winding part 311 and second winding part 312 with secondary rolling thread 33.34 of groups unshakable in one's determination are the EE sections heart (EE-core), the EI sections heart (EI-core) or the ER sections heart (ER-core), it can be arranged at axle center 341 in the drum stand module 31, make group 34 unshakable in one's determination and main coiling 32 and secondary rolling thread 33 produce the inductance coupling induction, to reach the purpose of voltage transitions.
Please consult Fig. 3 (a) again, first winding part 311 of drum stand module 31 and second winding part 312 have one first side plate 3111,3121 and one second side plate 3112,3122 respectively, and wherein 3112,3122 of first side plate 3111,3121 and second side plates form a winding region 3113,3123 and can supply main coiling 32 and secondary rolling thread 33 windings.In addition, second side plate, 3112,3122 belows of each winding part 311,312 stretch out to form a pin portion, and this pin portion is provided with several pins, and the joint after can winding the line for main coiling 32 and secondary rolling thread 33 is welded in.
In this embodiment, first winding part 311 and second winding part 312 are formed in one, and first side plate, 3121 separate specific range d of first side plate 3111 of first winding part 311 and second winding part 312, wherein this specific range d is good with 5mm in fact.By separation distance d, when main coiling 32 and secondary rolling thread 33 are wound in the winding region 3123 of the winding region 3113 of first winding part 311 and second winding part 312, can keep the electrical safety distance of 33 of main coiling 32 and secondary rolling threads, and increase the leakage inductance value of transformer.
Please consult Fig. 3 (a) again, drum stand upper shield 313 comprises two chambers 3131,3132, and it is separated by a dividing plate 3133 and be relative with second winding part 312 with first winding part 311 respectively.Two chambers 3131,3132 of drum stand upper shield 313 can cover first winding part 311 and second winding part, 312 covers, and dividing plate 3133 will engage and be positioned the gap of 3121 of first side plates of first side plate 3111 of first winding part 311 and second winding part 312, main coiling 32 and secondary rolling thread 33 are isolated, further increased the electrical safety distance of 33 of main coiling 32 and secondary rolling threads.In addition, also have one first opening 3134 and one second opening 3135 on the drum stand upper shield 313, this first opening 3134 is connected with first chamber 3131 and second chamber 3132 respectively with this second opening 3135, and be arranged at the top of first winding region 3113 and second winding region 3123, therefore when transformer operates, coiling 32,33 heats that produced just can be by first opening 3134 and 3135 heat radiations of second opening, to increase the radiating efficiency of transformer.In addition,, therefore also increased the electrical safety distance between main coiling 32 or secondary rolling thread and external conductive thing, improved electrical security because the distance between main coiling 32 and secondary rolling thread 33 and external conductive thing increases because of drum stand upper shield 313 covers.
Please consult Fig. 3 (b) again, drum stand module 31 also can increase by a base plate 314 with coiling 32 of the main on further separation first winding region 3113 and second winding region 3123 and secondary rolling thread 33 except first winding part 311, second winding part 312 and drum stand upper shield 313.In this embodiment, base plate 314 extends upward to form a fin 3141, this fin 3141 can engage and be positioned the gap of 3121 of first side plates of first side plate 3111 of first winding part 311 and second winding part 312, make main coiling 32 and 33 isolation of secondary rolling thread, further increase the electrical safety distance of 33 of main coiling 32 and secondary rolling threads.
See also Fig. 4, it is for another preferred embodiment structural representation of tool leakage type sense transformer of the present invention.As shown in Figure 4, this transformer 4 comprises a coiling module 41, main coiling (not icon), a level coiling (not icon) and a group 42 unshakable in one's determination.Wherein, this coiling module 41 has one first winding part 411 and one second winding part 412.This embodiment is different with Fig. 3 (a) illustrated embodiment is that this first winding part 411 is separated with this second winding part 412 but not one-body molded.In this embodiment, in the winding region that main coiling and secondary rolling thread are wound in first winding part 411 respectively and the winding region of second winding part 412 (not icon), and coat with a cladding material 413,414 respectively and insulate.Group 42 unshakable in one's determination is the EE sections heart (EE-core), the EI sections heart (EI-core), the ER sections heart (ER-core) or the UU sections heart (UU-core), it can be arranged at axle center 421 in the coiling module 41, make group 42 unshakable in one's determination and main coiling and secondary rolling thread produce the inductance coupling induction, to reach the purpose of voltage transitions.In addition, first winding part 411 and second winding part 412 have one first side plate 4111,4121 and one second side plate 4112,4122 respectively, and wherein 4112,4122 of first side plate 4111,4121 and second side plates form a winding region and can supply main coiling and secondary rolling thread winding.
Above-mentioned transformer device structure is by the following manner manufacturing: at first, main coiling and secondary rolling thread are wound in respectively on first winding part 411 and second winding part 412.Then, cover a cladding material 413,414 respectively with main coiling and secondary rolling thread insulation, so just can utilize cladding material protection main coiling and secondary rolling thread at first winding part 411 and second winding part 412.Then, again first winding part 411 and second winding part 412 are combined with separately first side plate 4111,4121 or contact.At last, iron core group 42 is combined with second winding part 412 with first winding part 411, promptly finish transformer device structure of the present invention.When using, be electrically connected as long as transformer is arranged at the assigned address on the printed circuit board (PCB) and first winding part 411 finished with the corresponding contact on the printed circuit board (PCB) with the contact on second winding part 412.
By above narration as can be known, because first winding part 411 and second winding part 412 be separable state, come the leakage inductance of control transformer and keep electrical security therefore easilier by adjusting the distance that first winding part 411 separates with second winding part 412.In addition, present embodiment only needs outside first winding part 411 and second winding part 412 coating one cladding material can become an assembly independently, thus, do not reduced the height of transformer integral body little, also can make processing procedure mechanization and automation, not only can significantly reduce manpower, and can manufacture in a large number and reduce production costs.
In sum, the distance that transformer device structure of the present invention can not only be by separating main coiling and secondary rolling thread to be reducing the coiling coupling efficiency and to increase leakage inductance, and can improve electrical security, simplifies processing procedure, saves artificial and manufacturing cost.The person skilled in the art all should be included in the scope of claims the various modifications that the present invention does.
Claims (11)
1. transformer device structure, comprising:
The coiling of one main;
A level coiling;
One drum stand module, it comprises one first winding part, one second winding part and a drum stand upper shield, this first winding part is used to twine this main coiling, this second winding part is used to twine this secondary rolling thread, and this drum stand upper shield is in order to cover this first winding part and this second winding part;
Wherein, this first winding part and this second winding part have one first side plate respectively, and this first winding part and this second winding part make this main coiling separate mutually with this secondary rolling thread each other with its first side plate separately or be connected; And
One group unshakable in one's determination, it is arranged in this drum stand module.
2. transformer device structure as claimed in claim 1, wherein this first winding part and this second winding part are formed in one.
3. transformer device structure as claimed in claim 2, wherein this drum stand upper shield has at least two chambers, and described two chambers are relative with this first winding part and this second winding part respectively, cover this first winding part and this second winding part with cover.
4. transformer device structure as claimed in claim 3, wherein said two chambers are separated with a demarcation strip, and this demarcation strip engages and be fixed in the formed gap of first side plate of this first winding part and this second winding part.
5. transformer device structure as claimed in claim 4, wherein this drum stand module also comprises a base plate, this base plate extends upward a fin, to engage and to be fixed in the formed gap of first side plate of this first winding part and this second winding part.
6. transformer device structure as claimed in claim 5, wherein this drum stand upper shield also comprises two openings, it is connected with described two chambers respectively, in order to the heat that this main winds the line and secondary rolling thread is produced that dispels the heat.
7. transformer device structure as claimed in claim 2, wherein this first winding part and this second winding part have one second side plate respectively, and this first side plate of this first winding part and this second winding part and this second side plate form a winding region.
8. transformer device structure as claimed in claim 7, the lead area that wherein stretches out below this second side plate, and this lead area has several pins.
9. transformer device structure as claimed in claim 1, wherein this first winding part and this second winding part are separated, and coat this main coiling and this secondary rolling thread with a cladding material respectively.
10. transformer device structure as claimed in claim 9, wherein this first winding part and this second winding part have one second side plate respectively, and this first side plate of this first winding part and this second winding part and this second side plate form a winding region.
11. transformer device structure as claimed in claim 1 should the iron core group be the EE sections heart, the EI sections heart, the ER sections heart or the UU sections heart wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100015910A CN1295720C (en) | 2004-01-14 | 2004-01-14 | Voltage transformer arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100015910A CN1295720C (en) | 2004-01-14 | 2004-01-14 | Voltage transformer arrangement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1558428A CN1558428A (en) | 2004-12-29 |
| CN1295720C true CN1295720C (en) | 2007-01-17 |
Family
ID=34350614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100015910A Expired - Lifetime CN1295720C (en) | 2004-01-14 | 2004-01-14 | Voltage transformer arrangement |
Country Status (1)
| Country | Link |
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| CN (1) | CN1295720C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101582324B (en) * | 2008-05-14 | 2012-06-06 | 台达电子工业股份有限公司 | Transformer structure |
| CN101645347B (en) * | 2008-08-07 | 2011-11-02 | 台达电子工业股份有限公司 | Transformer structure |
| CN101552099B (en) * | 2008-12-30 | 2012-09-19 | 浙江肯得机电股份有限公司 | Welder transformer and manufacturing method thereof |
| CN102779629B (en) * | 2011-05-10 | 2015-08-19 | 台达电子工业股份有限公司 | Drum stand and there is the magnet assembly of this drum stand |
| TWI431645B (en) | 2011-05-10 | 2014-03-21 | Delta Electronics Inc | Bobbin and magnetic module comprising the same |
| CN103943336A (en) * | 2014-03-27 | 2014-07-23 | 宝电电子(张家港)有限公司 | Electronic transformer |
| CN105405574A (en) * | 2015-12-28 | 2016-03-16 | 江苏晨朗电子集团有限公司 | EQV type common mode filter |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07161462A (en) * | 1993-12-03 | 1995-06-23 | Matsushita Electric Ind Co Ltd | High frequency heating device |
-
2004
- 2004-01-14 CN CNB2004100015910A patent/CN1295720C/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07161462A (en) * | 1993-12-03 | 1995-06-23 | Matsushita Electric Ind Co Ltd | High frequency heating device |
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| CN1558428A (en) | 2004-12-29 |
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Assignee: Delta Electronics (Jiangsu) Ltd. Assignor: DELTA ELECTRONICS, Inc. Contract fulfillment period: 2008.1.1 to 2013.12.31 Contract record no.: 2009990000379 Denomination of invention: Transformer structure Granted publication date: 20070117 License type: Exclusive license Record date: 20090428 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.1.1 TO 2013.12.31; CHANGE OF CONTRACT Name of requester: ZHONGDA ELECTRONICS (JIANGSU) CO., LTD. Effective date: 20090428 |
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Granted publication date: 20070117 |