CN109509743B - IGBT parallel unit and IGBT crimping structure - Google Patents
IGBT parallel unit and IGBT crimping structure Download PDFInfo
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- CN109509743B CN109509743B CN201811273737.5A CN201811273737A CN109509743B CN 109509743 B CN109509743 B CN 109509743B CN 201811273737 A CN201811273737 A CN 201811273737A CN 109509743 B CN109509743 B CN 109509743B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/07—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L29/00
- H01L25/074—Stacked arrangements of non-apertured devices
Abstract
The invention provides an IGBT parallel unit and an IGBT crimping structure, wherein the IGBT parallel unit comprises: the three aluminum cushion blocks and the two crimping type IGBTs are crimped and assembled into the IGBT parallel unit; two crimping formula IGBT intervals set up between three aluminium cushion, set up two connection faces that set up in middle second aluminium cushion and be connected with first crimping formula IGBT, second crimping formula IGBT's collecting electrode respectively, the projecting pole of first crimping formula IGBT pastes with first aluminium cushion mutually and is connected, the projecting pole of second crimping formula IGBT pastes with third aluminium cushion mutually and is connected. The press mounting structure is compact, the design is reasonable, the axis position is controlled simply, the operation is easy, the maintenance is convenient, the requirements of long-term operation stability and reliability can be met, and the cost is low. The invention can popularize the application of the high-power IGBT, improves the practicability of the direct current breaker and provides a new technical support for the technical field of the direct current breaker.
Description
Technical Field
The invention relates to the power technology, in particular to an IGBT parallel unit and an IGBT crimping structure.
Background
With the deep development of industrialization, higher requirements are put forward on the current, voltage and power consumption level of an Insulated Gate Bipolar Transistor (IGBT). In order to meet the design requirement of a high-power circuit, the IGBT with high power grade is usually directly adopted, or the IGBT with lower power grade is adopted to be used in series-parallel connection; the former will greatly increase the product cost and the complexity of the driving circuit, and the latter is widely studied due to its abundant market sources, low driving power and simple driving circuit. Therefore, the IGBT parallel connection is adopted to improve the current to meet the industrial requirement, and the method has great practical application value.
When the IGBT devices are used in parallel, the current distribution flowing through the parallel IGBT devices is unbalanced due to the fact that parameters of the IGBT devices are not consistent, driving signals are not synchronous, circuit layout is asymmetric and the like. The poor overcurrent that leads to part IGBT device during operation of flow equalizing is not enough, and some IGBT device transships, and greatly reduced IGBT device's reliability leads to equipment output effect unsatisfactory, causes IGBT device and device to damage even.
The crimping structure of the crimping type IGBT is mainly used for IGBT series crimping, the common crimping modes mainly comprise a vertical mode and a horizontal mode, and the difference of the crimping modes is related to the composition structure of the IGBT series crimping unit.
The parallel connection of IGBTs is mostly a crimp connection structure in which a plurality of IGBT modules are used for parallel connection and no crimp connection type IGBT parallel connection unit is provided.
Disclosure of Invention
In order to solve the problem of parallel crimping of the IGBT, an embodiment of the present invention provides an IGBT parallel unit, including: the three aluminum cushion blocks and the two crimping type IGBTs are crimped and assembled into the IGBT parallel unit; wherein the content of the first and second substances,
two crimping formula IGBT intervals set up between three aluminium cushion, set up two connection faces that set up in middle second aluminium cushion and be connected with first crimping formula IGBT, second crimping formula IGBT's collecting electrode respectively, the projecting pole and the first aluminium cushion of first crimping formula IGBT paste mutually and be connected, the projecting pole and the third aluminium cushion of second crimping formula IGBT paste mutually and be connected, and first crimping formula IGBT is parallelly connected with second crimping formula IGBT.
In the embodiment of the present invention, the parallel unit further includes: the IGBT driving board is connected with the crimping type IGBT in a plugging mode.
In the embodiment of the invention, the second aluminum cushion block arranged in the middle is eccentrically connected with the two crimping type IGBTs.
Meanwhile, the invention also discloses an IGBT crimping structure, which comprises: the pressing device is used for pressing and connecting the structural frame and the at least two IGBT parallel units; an insulated cushion block is arranged between the IGBT parallel units to form a crimping group string, the IGBT parallel units are connected in parallel, a pressing device is arranged at one end of the crimping structure frame, and the crimping group string which is subjected to crimping is fixed on the crimping structure frame;
the IGBT parallel unit comprises: the three aluminum cushion blocks and the two crimping type IGBTs are crimped and assembled into the IGBT parallel unit; wherein the content of the first and second substances,
two crimping formula IGBT intervals set up between three aluminium cushion, set up two connection faces that set up in middle second aluminium cushion and be connected with first crimping formula IGBT, second crimping formula IGBT's collecting electrode respectively, the projecting pole and the first aluminium cushion of first crimping formula IGBT paste mutually and be connected, the projecting pole and the third aluminium cushion of second crimping formula IGBT paste mutually and be connected, and first crimping formula IGBT is parallelly connected with second crimping formula IGBT.
In an embodiment of the present invention, the pressing device includes: the device comprises a shaft, a disc spring, a check ring, a flat gasket, a central shaft and a baffle plate;
the disc is elastic, the check ring is sleeved at one end of the shaft, the flat gasket is fixed on the shaft through the countersunk head bolt inside the check ring, the central shaft is fixedly connected with the baffle through the countersunk head bolt, the connected central shaft penetrates through a central hole of the flat gasket, and the pressing device is completed.
In an embodiment of the present invention, the crimping structural frame includes: the pressure-sensitive welding device comprises a front pressure dispersion plate, a rear pressure dispersion plate, a locking nut and four insulating pull rods, wherein the front pressure dispersion plate and the rear pressure dispersion plate are fixedly arranged at two ends of the four insulating pull rods through bolts to form a crimping structure frame;
the front pressure dispersion plate is provided with a center hole, and the locking nut penetrates through the center hole of the front pressure dispersion plate and is in threaded connection with the other end of the shaft.
In an embodiment of the present invention, the IGBT crimping structure further includes: and the tool component is fixed on the crimping structure frame through a bolt.
In an embodiment of the present invention, the IGBT crimping structure further includes: and the cushion block is arranged at the other end of the compression joint structure frame.
The invention provides a crimping structure based on a plurality of crimping type IGBT parallel units, which solves the problem of crimping of the crimping type IGBT parallel units. The press mounting structure is compact, the design is reasonable, the axis position is controlled simply, the operation is easy, the maintenance is convenient, the requirements of long-term operation stability and reliability can be met, and the cost is low. The invention can popularize the application of the high-power IGBT, improves the practicability of the direct current breaker and provides a new technical support for the technical field of the direct current breaker.
In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of an IGBT parallel unit in an embodiment of the invention;
fig. 2 is a side view of an IGBT parallel unit in the embodiment of the invention;
FIG. 3 is a schematic view of a compacting apparatus according to an embodiment of the invention;
FIG. 4 is a cross-sectional view of a compression device in an embodiment of the present invention;
FIG. 5 is a frame diagram of a crimping structure in an embodiment of the invention;
FIG. 6 is a tooling diagram of a crimping structure in an embodiment of the invention;
fig. 7 is a structural diagram of a crimping structure of a crimping type crimping IGBT parallel unit in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a crimping structure which takes a square crimping type IGBT as a device and takes an IGBT parallel unit as a crimping unit. The IGBT parallel units are used as units, and the two IGBT parallel units are separated by the insulating cushion block, so that the rest units can work normally even if one group of units is damaged. The whole structure can be regarded as a single module for use, and a plurality of modules form a basic module unit of the converter valve with higher voltage grade or larger current.
The IGBT parallel unit in the embodiment of the invention is formed by assembling an aluminum cushion block, a compression joint type IGBT, the aluminum cushion block and a driving support. As shown in fig. 1, a schematic diagram of an IGBT parallel unit in the present embodiment includes: the first aluminum pad block 101, the first crimp type IGBT102, the second aluminum pad block 103, the second crimp type IGBT104, the third aluminum pad block 105, the driving support 106 and the IGBT driving 107 are assembled.
A gate pole of the first crimping type IGBT102 is connected with an IGBT drive 107 through a socket, a drive support 106 is connected with the IGBT drive through a bolt and integrally fixed on the end face of the first aluminum cushion block 101, and an emitter (E pole) face of the first crimping type IGBT102 is attached to the side face of the first aluminum cushion block 101, so that the first aluminum cushion block 101 and the first crimping type IGBT102 are assembled; the second crimp IGBT104 and the third aluminum pad 105 are assembled in the same manner.
And placing the first crimping type IGBT102 and the second crimping type IGBT104 assembled with the IGBT driver 107 on two sides of the second aluminum cushion block 103, respectively placing the collectors of the first crimping type IGBT102 and the second crimping type IGBT104 in close contact with two surfaces of the second aluminum cushion block 103, and completing the assembly of the IGBT parallel connection unit. Fig. 2 is a side view of an IGBT parallel unit according to an embodiment of the present invention.
First crimping formula IGBT102 links to each other through the socket with the IGBT drive 107 that installs the driving support (the driving support is fixed mutually with the IGBT drive through the bolt), will place the first crimping formula IGBT102, the second crimping formula IGBT104 that assemble with the IGBT drive in the both sides of second aluminium cushion block 103, the collecting electrode of first crimping formula IGBT102, second crimping formula IGBT104 is hugged closely with two faces of second aluminium cushion block 103 respectively and is placed, the one end of driving support links to each other with the drive in this embodiment, the other end links to each other with the aluminium cushion block.
The first aluminum cushion block 101 and the second aluminum cushion block 103 are respectively placed in the direction of an IGBT emitter and attached to the emitter surface, the driving support 106 is connected with the IGBT through screws and fixed on the end surface of the aluminum cushion block 101 to be connected with the IGBT102 in an inserting mode, the first aluminum cushion block 101 and the first crimping type IGBT102 are assembled, the second crimping type IGBT104 and the third aluminum cushion block 105 are assembled in the same mode, and the IGBT parallel unit is assembled. Fig. 2 is a side view of an IGBT parallel unit according to an embodiment of the present invention.
Two required parallel connection crimping type IGBTs 102 and collectors of the crimping type IGBT104 are attached to two faces of an aluminum cushion block 103, an emitter electrode of the crimping type IGBT102 is attached to the aluminum cushion block 101, an emitter electrode of the crimping type IGBT104 is attached to an aluminum cushion block 105, and IGBT driving is fixed on the aluminum cushion block 103 through a driving support.
The crimping structure based on a plurality of crimping type IGBT parallel units in the embodiment of the invention comprises: closing device, crimping structure frame, IGBT parallel unit, crimping structure frock.
The pressing device is composed of a shaft, a disc spring, a check ring, a flat gasket, a central shaft and a baffle, wherein the check ring is fixed on the shaft by the flat gasket and the disc spring, the central shaft is connected with the baffle and controls the shaft center through the flat gasket, and the horizontal straight line movement in the crimping process is ensured.
As shown in fig. 3, which is a schematic view of a pressing device in an embodiment of the present invention, the pressing device is formed by assembling a shaft 6, a disc spring 7, a retainer ring 8, a flat gasket 9, a central shaft 10, and a baffle plate 11 through countersunk head fastening bolts.
As shown in fig. 4, in this embodiment, two disc projectiles are included, every two disc projectiles 7 are buckled and sleeved at one end of the shaft 6, the retainer ring 8 is tightly sleeved on the shaft 6 adjacent to the disc projectiles, the flat gasket 9 is fixed on the shaft 6 through a countersunk head bolt 401 inside the retainer ring 8, the central shaft 10 is fixedly connected with the baffle plate 11 through the countersunk head bolt 401, the connected central shaft 10 penetrates through a central hole of the flat gasket 9, and the assembly of the pressing device is completed.
In this embodiment, the crimping structural frame is formed by assembling a front pressure dispersion plate, a rear pressure dispersion plate, an insulating pull rod, a lock nut, and a pressing device.
As shown in fig. 5, the frame of the crimping structure includes: front pressure dispersion board 1, back pressure dispersion board 2, insulating pull rod 3, lock nut 5. Fixing the front pressure dispersion plate 1, the rear pressure dispersion plate 2 and the insulating pull rod 3 through bolts to form a frame; the lock nut 5 is connected with one end with screw thread of a shaft 6 in the compressing device (the screw thread of the shaft 6 is positioned at the end opposite to the end for installing the disc spring 7, the retainer ring 8 and the flat gasket 9) to form a whole, and the lock nut 5 penetrates into the central hole of the front pressure dispersion plate 1 to form a frame of the whole compression joint structure.
Locking nut 5 and the 6 registrates of axle among the closing device, in the pressure dispersion board before whole embedding, at the crimping in-process, constantly rotatory locking nut ensures that locking nut 5 can not break away from with preceding pressure dispersion board because once only the displacement is too big.
In the present embodiment, the tool for the crimping structure is formed by fixing the tool component 21 and the tool component 22 by bolts, and the tool component 21 and the tool component 22 are fixed by bolts to form the tool 20 for the crimping structure, as shown in fig. 6. The tool mainly aims to position and support the IGBT parallel units, so that the phenomenon that the IGBT parallel units sink in the crimping process is avoided, and the stress of the IGBT is ensured to be on a horizontal straight line.
As shown in fig. 7, the structure diagram of the crimping structure of the crimping IGBT parallel unit in this embodiment is shown, and the crimping structure of the crimping IGBT parallel unit in this embodiment includes: the structure frame 17, the IGBT parallel unit 18, the insulating cushion block 19, the tool 20 and the cushion block 23 are assembled.
When assembling the crimping structure, first, the tooling 20 of the crimping structure is connected with the structural frame 17 through bolts, and the whole connecting body is horizontally placed. Secondly, connecting a plurality of IGBT parallel units 18 and insulating cushion blocks 19 at intervals to form a compression joint group string, placing a cushion block 23 at the tail end of the group string, wherein the cushion block 23 can determine the material according to the actual requirement, and if the same potential is allowed, the group string is made of a conductive material; if the potential is required to be separated from the potential of the rear pressure dispersion plate 2, the rear pressure dispersion plate is made of an insulating material; the cushion block 23 can be increased or decreased in thickness according to requirements. Finally, the pressure welding is carried out through a hydraulic device, the locking nut 5 is rotated in the pressure welding process, and the connecting part of the locking nut 5 and the front pressure dispersion plate 1 is ensured to be always in the front pressure dispersion plate in the pressure welding process.
In the crimping process, the locking nut 5, the shaft 6, the flat gasket 9 and the central shaft 10 are always on the same horizontal line, the baffle 11 increases the stress area of the IGBT, and the crimping type IGBT is guaranteed to be stressed uniformly and move horizontally in the linear direction in the whole crimping process.
In the embodiment of the invention, the first aluminum cushion block 102 and the second aluminum cushion block 104 of the IGBT parallel unit are eccentric in design, and the eccentric distance is related to the thickness of a connecting copper bar (parallel input copper bar in specific application) of a crimping structure, so that the paths of current flowing through the aluminum cushion blocks to two IGBT collecting electrodes are basically equal, and the current sharing of the parallel IGBTs is solved.
The crimping structure based on the plurality of crimping type IGBT parallel units solves the problem of crimping of the crimping type IGBT parallel units. The press mounting structure is compact, the design is reasonable, the axis position is controlled simply, the operation is easy, the maintenance is convenient, the requirements of long-term operation stability and reliability can be met, and the cost is low; in addition, the application of the high-power IGBT is popularized, the practicability of the direct-current circuit breaker is improved, and a new technical support is provided for the technical field of the direct-current circuit breaker.
Meanwhile, the invention also provides a novel crimping type IGBT parallel crimping structure, and the existing IGBT parallel connection mode is fixedly arranged on the same radiator in a module mode to be connected in parallel. Meanwhile, the existing crimping type IGBT parallel connection adopts a crimping structure for parallel connection, and the crimping structure is internally provided with an IGBT series connection mode, so that all devices in the whole crimping structure can be damaged due to the damage of a single device.
The aluminum cushion block of the IGBT parallel unit is eccentric, so that the parallel current sharing problem is solved; and the press mounting structure is compact, the axis position is simple to control, the stress is uniform, and the press mounting structure can horizontally move along the linear direction along with the press connection. The integral structure of the IGBT parallel unit can be regarded as a single module for use, namely the number of the IGBTs used in parallel can be increased or decreased according to the voltage grade, and a plurality of crimping modules can be connected in series for use according to actual requirements, so that a basic module unit of a converter valve with higher voltage grade or larger current can be formed by a plurality of modules, the maintenance is convenient, the field maintenance workload can be reduced, the replacement efficiency of components with faults is improved, and the cost is saved.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (7)
1. An IGBT parallel unit, characterized in that, the IGBT parallel unit includes: the three aluminum cushion blocks and the two crimping type IGBTs are crimped and assembled into the IGBT parallel unit; wherein the content of the first and second substances,
the two crimping type IGBTs are arranged between the three aluminum cushion blocks at intervals, two connecting surfaces of a second aluminum cushion block arranged in the middle are respectively connected with collectors of a first crimping type IGBT and a second crimping type IGBT, an emitter of the first crimping type IGBT is attached to the first aluminum cushion block, an emitter of the second crimping type IGBT is attached to a third aluminum cushion block, and the first crimping type IGBT is connected with the second crimping type IGBT in parallel;
the two IGBT drives are respectively fixed with the first aluminum cushion block and the third aluminum cushion block through the driving support, and the IGBT drives are connected with the crimping type IGBT in an inserting mode.
2. An IGBT crimping structure, characterized in that, IGBT crimping structure includes: the pressing device is used for pressing and connecting the structural frame and the at least two IGBT parallel units; the insulated cushion blocks are arranged between the IGBT parallel units to form a crimping group string, the IGBT parallel units are connected in parallel, the pressing device is arranged at one end of the crimping structure frame, and the crimping group string which is subjected to crimping is fixed on the crimping structure frame; wherein the content of the first and second substances,
the IGBT parallel unit comprises: the three aluminum cushion blocks and the two crimping type IGBTs are crimped and assembled into the IGBT parallel unit; wherein the content of the first and second substances,
two crimping formula IGBT intervals set up between three aluminium cushion, set up two connection faces that set up in middle second aluminium cushion and be connected with first crimping formula IGBT, second crimping formula IGBT's collecting electrode respectively, first crimping formula IGBT's collecting electrode pastes with first aluminium cushion mutually and is connected, second crimping formula IGBT's collecting electrode pastes with third aluminium cushion mutually and is connected, and first crimping formula IGBT is parallelly connected with second crimping formula IGBT.
3. The IGBT crimping structure according to claim 2, wherein the pressing means comprises: the device comprises a shaft (6), a disc bullet (7), a retainer ring (8), a flat gasket (9), a central shaft (10) and a baffle plate (11);
dish bullet (7), retaining ring (8) cover in the one end of axle (6), and flat gasket (9) are fixed on axle (6) through countersunk head bolt (401) inside retaining ring (8), and center pin (10) and baffle (11) pass through countersunk head bolt (401) fixed the linking to each other, and center pin (10) pass the centre bore of flat gasket (9).
4. The IGBT crimping structure according to claim 3, wherein the crimping structure frame comprises: the pressure-sensitive welding device comprises a front pressure dispersion plate (1), a rear pressure dispersion plate (2), a locking nut and four insulating pull rods (3), wherein the front pressure dispersion plate (1) and the rear pressure dispersion plate (2) are fixedly arranged at two ends of the four insulating pull rods (3) through bolts to form a crimping structure frame;
the front pressure dispersion plate (1) is provided with a center hole, and the locking nut penetrates through the center hole of the front pressure dispersion plate (1) and is in threaded connection with the other end of the shaft (6).
5. The IGBT crimping structure according to claim 2, further comprising: and the tool component is fixed on the crimping structure frame through a bolt.
6. The IGBT crimping structure according to claim 2, further comprising: and the cushion block is arranged at the other end of the compression joint structure frame.
7. The IGBT crimping structure according to claim 2, wherein the parallel unit further comprises: the two IGBT drives are respectively fixed with the first aluminum cushion block and the third aluminum cushion block through the driving support, and the IGBT drives are connected with the crimping type IGBT in an inserting mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811273737.5A CN109509743B (en) | 2018-10-30 | 2018-10-30 | IGBT parallel unit and IGBT crimping structure |
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| CN201811273737.5A CN109509743B (en) | 2018-10-30 | 2018-10-30 | IGBT parallel unit and IGBT crimping structure |
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| CN109509743B true CN109509743B (en) | 2020-07-24 |
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| CN105006474A (en) * | 2015-07-28 | 2015-10-28 | 许继电气股份有限公司 | Converter valve component used for flexible DC power transmission and IGBT submodules thereof |
| CN107731798A (en) * | 2017-09-08 | 2018-02-23 | 许继电气股份有限公司 | A kind of compression joint type power model valve section and valve segment frames |
| CN207398071U (en) * | 2017-06-30 | 2018-05-22 | 西安中车永电电气有限公司 | A kind of compression joint type IGBT module laminated module and compression joint type IGBT module internal enclosing structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005302951A (en) * | 2004-04-09 | 2005-10-27 | Toshiba Corp | Semiconductor device package for power |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105006474A (en) * | 2015-07-28 | 2015-10-28 | 许继电气股份有限公司 | Converter valve component used for flexible DC power transmission and IGBT submodules thereof |
| CN207398071U (en) * | 2017-06-30 | 2018-05-22 | 西安中车永电电气有限公司 | A kind of compression joint type IGBT module laminated module and compression joint type IGBT module internal enclosing structure |
| CN107731798A (en) * | 2017-09-08 | 2018-02-23 | 许继电气股份有限公司 | A kind of compression joint type power model valve section and valve segment frames |
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Effective date of registration: 20230712 Address after: 710075 No. 2 Xifu Road, West Third Ring Road, Xi'an City, Shaanxi Province Patentee after: XI'AN XD POWER SYSTEMS Co.,Ltd. Patentee after: Xi'an Xidian Power Electronics Co.,Ltd. Patentee after: CHINA XD ELECTRIC Co.,Ltd. Address before: 710075 No. 2 Xifu Road, West Third Ring Road, Xi'an City, Shaanxi Province Patentee before: XI'AN XD POWER SYSTEMS Co.,Ltd. Patentee before: CHINA XD ELECTRIC Co.,Ltd. |