CN109406904B - Double-layer testing tool for kilowatt high-power supply module - Google Patents
Double-layer testing tool for kilowatt high-power supply module Download PDFInfo
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- CN109406904B CN109406904B CN201811474155.3A CN201811474155A CN109406904B CN 109406904 B CN109406904 B CN 109406904B CN 201811474155 A CN201811474155 A CN 201811474155A CN 109406904 B CN109406904 B CN 109406904B
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- 238000012360 testing method Methods 0.000 title claims abstract description 32
- 238000001816 cooling Methods 0.000 claims abstract description 72
- 239000000758 substrate Substances 0.000 claims abstract description 58
- 239000007788 liquid Substances 0.000 claims abstract description 50
- 239000002184 metal Substances 0.000 claims abstract description 42
- 239000000919 ceramic Substances 0.000 claims abstract description 16
- 239000000110 cooling liquid Substances 0.000 claims abstract description 15
- 150000003071 polychlorinated biphenyls Chemical class 0.000 claims abstract description 5
- 230000009471 action Effects 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000002826 coolant Substances 0.000 description 7
- 230000008676 import Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005389 magnetism Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- LAXBNTIAOJWAOP-UHFFFAOYSA-N 2-chlorobiphenyl Chemical compound ClC1=CC=CC=C1C1=CC=CC=C1 LAXBNTIAOJWAOP-UHFFFAOYSA-N 0.000 description 2
- NMWSKOLWZZWHPL-UHFFFAOYSA-N 3-chlorobiphenyl Chemical compound ClC1=CC=CC(C=2C=CC=CC=2)=C1 NMWSKOLWZZWHPL-UHFFFAOYSA-N 0.000 description 2
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- 101001082832 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) Pyruvate carboxylase 2 Proteins 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
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- 125000004122 cyclic group Chemical group 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Tests Of Electronic Circuits (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a double-layer test tool for a kilowatt high-power supply module, which is characterized in that a PCB (printed circuit board) is arranged into double layers, components required for testing are arranged on opposite surfaces of the PCB, the purpose of reducing the occupied area is realized, ceramic substrates are attached to the opposite surfaces of the two PCBs, the heat of pins of the components is conducted to metal substrates, liquid cooling circulating pipelines which are mutually communicated are arranged in the two metal substrates which are arranged up and down, a cooling fan is arranged on the surface of one metal substrate, an electromagnet is arranged on one blade of the cooling fan, one section of the liquid cooling circulating pipeline is arranged into an arc-shaped pipeline, a moving piston is arranged in the arc-shaped pipeline and can reciprocate in the arc-shaped pipeline along with the electromagnet, so that the circulation of cooling liquid in the whole liquid cooling circulating pipeline is realized, the double-layer tool is cooled, and the components work at a proper temperature, the stability of double-deck test fixture has been improved, the life of components and parts has been prolonged.
Description
Technical Field
The invention relates to the field of PCB (printed circuit board), in particular to a double-layer testing tool for a kilowatt high-power module.
Background
An AC/DC power converter capable of converting an AC power source into a DC power source, the AC being an alternating current and the DC being a direct current. The power of the product is from several watts to several kilowatts, and the product is widely applied to modern industry.
In the aerospace industry, a 300-1008W high-power AC/DC power converter is often used, and before the power converter is used, the power converter needs to be detected to ensure that all performances are normal. However, the conventional power module test system is assembled by adopting a single PCB, all components are concentrated on the same PCB, and because the power module test system is used for testing a 300-1008W high-power AC/DC power converter, more components such as capacitors and resistors need to be adopted, so that the PCB in the conventional power module test system occupies more space; moreover, because most of the tests are 300-1008W high-power AC/DC power converters, the heating of the components is serious during the test, the components are easy to age due to long-time heating, the service life of the test system is shortened, and the test result can be influenced.
Disclosure of Invention
In view of this, the invention aims to provide a double-layer testing tool for a kilowatt high-power module, so that the space occupied by a PCB (printed circuit board) in a power module testing system is reduced, and the rapid heat dissipation of the PCB is realized.
The invention provides a kilowatt high-power module double-layer testing tool based on the aim, which comprises two PCB boards which are arranged oppositely up and down, wherein electrical components are arranged on the opposite surfaces of the PCB boards, ceramic substrates are respectively attached to the opposite surfaces of the PCB boards, metal substrates are also respectively attached to the ceramic substrates, liquid cooling circulation channels which are mutually communicated are arranged in the two metal substrates, a cooling fan is arranged on the surface of the upper metal substrate, an electromagnet is arranged on one fan blade of the cooling fan, and an arc-shaped pipeline matched with the movement track of the electromagnet is arranged in the metal substrate; the inside motion piston that takes magnetism that is equipped with of arc pipeline can be under the effect of electro-magnet and make reciprocating motion in the arc pipeline, and the liquid cooling circulating line is UNICOM respectively at arc pipeline both ends, and both ends UNICOM department still is equipped with the check valve, makes the coolant liquid flow to the export from circulating line's import.
Optionally, a temperature sensor is arranged in the circulating pipeline, and the temperature sensor, the electromagnet and the cooling fan are electrically connected with a control element.
Optionally, the motion piston is including having magnetic slide bar, and folding piston portion is installed on the slide bar top, and piston portion is the ring form, and uses the slide bar as centre of a circle articulated with the slide bar top, and piston portion edge articulates there is many with the connecting rod, and the connecting rod other end is connected with the sliding part, and the sliding part cover is established with the slide bar on, the tray is installed to the slide bar bottom, can carry on spacingly messenger piston portion opening area the biggest to the sliding part, and piston portion top center department fixed mounting has the flexible pole.
Optionally, the material of the piston portion is rubber.
Optionally, the two PCB boards are arranged oppositely from top to bottom, and are fixedly supported by support columns distributed at four corners of the two PCB boards, an insulated liquid cooling pipeline is arranged inside each fixing column, the upper end and the lower end of each positioning column respectively penetrate through the two PCB boards and the ceramic substrate and are in threaded connection with the metal substrate, and the liquid cooling pipeline is communicated with a liquid cooling circulating pipeline in the metal substrate.
Optionally, the liquid cooling pipeline and the liquid cooling circulating pipeline are communicated and sealed by a silica gel sealing ring.
Optionally, the liquid cooling circulation pipes in the metal substrate are distributed in a bent manner.
From the above, the purpose of reducing the occupied area is realized by arranging the two PCB boards as two layers and arranging the components required for testing on the opposite surfaces of the two PCB boards, attaching the ceramic substrates on the opposite surfaces of the two PCB boards, transferring the heat of the pins of the components to the metal substrates, arranging the mutually communicated liquid cooling circulation pipelines in the two metal substrates arranged up and down, arranging the cooling fan on the surface of the metal substrate arranged above, arranging the electromagnet on one blade of the cooling fan, arranging one section of the liquid cooling circulation pipeline as an arc pipeline, arranging the check valves at the two ends of the arc pipeline, wherein the arc pipeline corresponds to the movement track of the electromagnet, arranging the moving piston in the arc pipeline, and the moving piston can reciprocate in the arc pipeline along with the electromagnet, thereby realize the circulation of the inside coolant liquid of whole liquid cooling circulating line, cool down double-deck frock, make its components and parts carry out work under appropriate temperature, improved the stability of double-deck test fixture, prolonged the life of components and parts.
Drawings
FIG. 1 is a schematic diagram of a kilowatt high-power module double-layer test tool according to an embodiment of the invention;
FIG. 2 is a cross-sectional view of a first metal substrate in an embodiment of the invention;
FIG. 3 is a front view of the moving piston as it opens in an embodiment of the present invention;
FIG. 4 is a front view of the moving piston as it closes in an embodiment of the present invention;
FIG. 5 is a schematic view of the inside structure of the sports Huasai when opened according to the embodiment of the present invention.
FIG. 6 is a schematic view of the internal structure of the embodiment of the present invention when the moving piston is closed;
FIG. 7 is a bottom view of the moving piston of an embodiment of the present invention shown open;
FIG. 8 is a top view of an embodiment of the present invention with the moving piston open;
FIG. 9 is a schematic view of a support post in an embodiment of the invention;
FIG. 10 is a cross-sectional view of a second metal substrate in an embodiment of the invention;
in the figure: 1-a first PCB circuit board, 2-a second PCB circuit board, 3-a first ceramic substrate, 4-a second ceramic substrate, 5-a first metal substrate, 6-a second metal substrate, 7-a support column, 8-a cooling fan, 9-an electromagnet, 10-an arc pipeline, 11-a moving piston, 12-an outlet one-way valve, 13-an inlet one-way valve, 14-a liquid cooling circulating pipeline, 71-a liquid cooling pipeline, 111-a piston part, 112-a sliding rod, 113-a connecting rod, 114-a sliding part, 115-an elastic rod and 116-a tray.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and they are not described in any more detail in the following embodiments.
The invention discloses an implementation mode, in particular to a double-layer testing tool for a kilowatt high-power supply module, which comprises two PCB boards which are arranged oppositely up and down, wherein electrical components are arranged on the opposite surfaces of the PCB boards, ceramic substrates are respectively attached to the opposite surfaces of the PCB boards, metal substrates are also respectively attached to the ceramic substrates, liquid cooling circulation channels which are mutually communicated are arranged inside the two metal substrates, a cooling fan is arranged on the surface of the upper metal substrate, an electromagnet is arranged on one fan blade of the cooling fan, and an arc-shaped pipeline matched with the movement track of the electromagnet is arranged inside the metal substrate; the inside motion piston that takes magnetism that is equipped with of arc pipeline can do the back and forth motion in the arc pipeline under the effect of electro-magnet, and the liquid cooling circulating line is UNICOM respectively at circulating line both ends, and both ends UNICOM department still is equipped with the check valve, makes the coolant liquid flow to the export from circulating line's import.
As shown in fig. 1, as another embodiment of the present invention, a double-layer test fixture for a kilowatt high-power supply module includes a first PCB 1 and a second PCB 2 which are arranged opposite to each other, support pillars 7 are installed at four corners of the two PCBs, a device required for a test is installed on a surface of the first PCB 1 close to the second PCB 2, a first ceramic substrate 3 is installed on a surface of the first PCB far from the second PCB in a fitting manner to conduct heat at a pin of the device, a first metal substrate 5 is installed on a top surface of the first ceramic substrate 3 in a fitting manner, a cooling fan 8 is further installed on an upper surface of the first metal substrate 5, and an electromagnet is installed on one of blades of the cooling fan 8. The upper surface of the second PCB is provided with elements required by testing, the lower surface of the second PCB is provided with a second ceramic substrate 4 for conducting heat at the pins of the elements, and the lower surface of the second ceramic substrate 4 is also provided with a second metal substrate 6. The double-layer structure can effectively reduce the space occupied by the PCB.
As shown in fig. 2, 9 and 10, the first metal substrate 5 and the second metal substrate 6 are respectively provided with a liquid cooling circulation channel 14 inside, the support pillar 7 is provided with an insulated liquid cooling pipeline 71 inside, the upper end and the lower end of the support pillar 71 are respectively screwed with the first metal substrate 5 and the second metal substrate 6, the liquid cooling circulation channels inside the first metal substrate 5 and the second metal substrate 6 are communicated through the liquid cooling pipeline 71, the liquid cooling circulation channel 14 inside the first metal substrate 5 includes an arc-shaped pipeline 10, and the arc-shaped pipeline 10 is arranged along the movement track of the electromagnet 9, and is selectable and semicircular. The both ends of arc pipeline 10 are provided with export check valve 12 and import check valve 13 respectively, and optionally, cooling fan 8 anticlockwise rotation, export check valve 12 is located the arc pipeline left end, and import check valve 13 is located the arc pipeline right-hand member. The inside of the arc-shaped pipeline 10 is also provided with a moving piston 11 which can slide along the pipeline, and the moving piston 11 is provided with magnetism.
As shown in fig. 3-8, the moving piston 11 includes a magnetic sliding rod 112, a foldable piston portion 111 is installed at the top end of the sliding rod 112, the piston portion 111 is circular and is hinged to the top end of the sliding rod 112 with the sliding rod 112 as a center, a multi-heel connecting rod 113 is hinged to the edge of the piston portion 111, the other end of the connecting rod 113 is connected with a sliding portion 114, the sliding portion 114 is sleeved on the sliding rod 112, a tray 116 is installed at the bottom end of the sliding rod 112, the sliding portion 114 can be limited to maximize the opening area of the piston portion, and an elastic rod 115 is fixedly installed at the center of the top of the piston portion. When the cooling fan 8 works, the electromagnet 9 drives the moving piston 11 to move in the arc-shaped pipeline 10, so as to extrude the cooling liquid in the arc-shaped pipeline 10 out of the outlet one-way valve 12, at the moment, under the influence of the pressure of the cooling liquid, the piston part 111 is opened, and the tray 116 limits the sliding part 114, because the liquid cooling circulating pipeline 14 in the first metal substrate 6 is communicated with the liquid cooling circulating pipeline 14 in the first metal substrate 5, the cooling liquid cooled by the cooling fan 8 enters the liquid cooling circulating pipeline 14 below under the action of the pressure, and the cooling liquid with higher temperature below enters the arc-shaped pipeline 14 from the inlet one-way valve 13, when the moving piston 11 moves to one end of the arc-shaped pipeline 10 close to the outlet one-way valve, under the action of the electromagnet 9, the elastic rod 115 is extruded, when the electromagnet 9 continues to rotate far away from the arc-shaped pipeline 10, under the action of the elastic rod 115, the moving piston 11 rebounds, and the sliding portion 114 slides along the sliding rod 112 under the pressure of the cooling liquid, and the piston portion 111 contracts, so that the circulation realizes the reciprocating motion of the moving piston 11 inside the arc-shaped pipe 14, thereby realizing the circulation of the cooling liquid.
In order to make cooling fan 8 can be according to coolant liquid temperature adjustment rotational speed, be provided with temperature-sensing ware in the arc pipeline 10, temperature-sensing ware, electro- magnet 9 and 8 electrically connected of cooling fan have main control element, and when the inside high temperature of arc pipeline 10, electro-magnet 9 outage, cooling fan 8 accelerates, carries out quick cooling to the coolant liquid of the liquid cooling circulating line 14 inside of top, and when coolant liquid temperature was lower, electro-magnet 9 circular telegram made the coolant liquid circulate.
In order to ensure the sealing performance, the communication position of the liquid cooling pipeline 71 and the liquid cooling circulating pipeline 14 is sealed by a silica gel sealing ring.
In order to make the cooling effect better, the liquid cooling circulation pipeline 14 is distributed in a bent manner.
In order to improve the cycle efficiency and the service life of the piston portion, the material of the piston portion 111 is rubber. A
The working principle of the invention is as follows: the double-layer tool structure is adopted to reduce the occupied area of the PCB, and meanwhile, the double-layer tool provides conditions for liquid cooling circulation. When the temperature in the arc-shaped pipeline 10 is lower, the cooling fan 8 rotates slowly, so that the moving piston 11 moves, the cooling liquid in the arc-shaped pipeline 10 is extruded out from the outlet one-way valve 12, at this time, under the influence of the cooling liquid pressure, the piston part 111 is opened, the sliding part 114 is limited by the tray 116, because the liquid cooling circulating pipeline 14 in the first metal substrate 6 is communicated with the liquid cooling circulating pipeline 14 in the first metal substrate 5, the cooling liquid cooled by the cooling fan 8 enters the liquid cooling circulating pipeline 14 below under the action of the pressure, and the cooling liquid with higher temperature below enters the arc-shaped pipeline 14 from the inlet one-way valve 13, when the moving piston 11 moves to one end of the arc-shaped pipeline 10 close to the outlet one-way valve, under the action of the electromagnet 9, the elastic rod 115 is extruded, when the electromagnet 9 continues to rotate far away from the arc-shaped pipeline 10, under the action of the elastic rod 115, the moving piston 11 rebounds, under the pressure action of the cooling liquid, the sliding portion 114 slides along the sliding rod 112, the piston portion 111 contracts, the reciprocating motion of the moving piston 11 inside the arc-shaped pipeline 14 is achieved through the circulation, therefore, the circulation of the cooling liquid is achieved, when the temperature inside the arc-shaped pipeline 10 is high, the electromagnet 9 is powered off, and the cooling fan 8 rotates at a high speed to achieve cooling of the cooling liquid in the arc-shaped pipeline 10. The whole cooling of the double-layer tool structure is realized through the cyclic reciprocation of the work.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
In addition, well known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown within the provided figures for simplicity of illustration and discussion, and so as not to obscure the invention. Furthermore, devices may be shown in block diagram form in order to avoid obscuring the invention, and also in view of the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the present invention is to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the invention, it should be apparent to one skilled in the art that the invention can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.
While the present invention has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic ram (dram)) may use the discussed embodiments.
The embodiments of the invention are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (8)
1. The double-layer testing tool for the kilowatt high-power supply module is characterized by comprising two PCB boards which are oppositely arranged up and down, wherein electrical components are arranged on opposite surfaces of the PCB boards, ceramic substrates are respectively attached to opposite surfaces of the PCB boards, and metal substrates are respectively attached to opposite surfaces of the ceramic substrates;
liquid cooling circulation channels which are communicated with each other are arranged in the two metal substrates, a cooling fan is arranged on the surface of one metal substrate, an electromagnet is arranged on one fan blade of the cooling fan, and an arc-shaped pipeline matched with the movement track of the electromagnet is arranged in the metal substrate where the cooling fan is arranged;
a magnetic moving piston is arranged in the arc-shaped pipeline and can move back and forth in the arc-shaped pipeline under the action of an electromagnet, two ends of the arc-shaped pipeline are respectively communicated with the liquid cooling circulating pipeline, and a check valve is arranged to enable cooling liquid to flow from an inlet to an outlet of the arc-shaped pipeline;
the motion piston is including having magnetic slide bar, and folding piston portion is installed on the slide bar top, and piston portion is the ring form, and uses the slide bar to articulate as the centre of a circle with the slide bar top, and piston portion edge articulates has many with the connecting rod, and the connecting rod other end is connected with the sliding part, and the sliding part cover is established with the slide bar on, the tray is installed to the slide bar bottom, can carry on spacingly messenger piston portion opening area to the sliding part and be the biggest, and piston portion top center department fixed mounting has the flexible pole.
2. The double-layer test tool for the kilowatt high-power supply module according to claim 1, wherein a temperature sensor is arranged in the arc-shaped pipeline, and the temperature sensor, the electromagnet and the cooling fan are electrically connected with a main control element.
3. The double-layer test tool for the kilowatt high-power supply module according to claim 1, wherein the piston part is made of rubber.
4. The double-layer testing tool for the kilowatt high-power supply module according to claim 1, wherein the two PCBs which are oppositely arranged up and down are fixedly supported by supporting columns distributed at four corners of the PCBs, an insulated liquid cooling pipeline is arranged inside each fixing column, the upper end and the lower end of each positioning column respectively penetrate through the PCBs and the ceramic substrate and are in threaded connection with the metal substrate, and the liquid cooling pipeline is communicated with a liquid cooling circulating pipeline in the metal substrate.
5. The double-layer testing tool for the kilowatt high-power supply module according to claim 4, wherein the joint of the liquid cooling pipeline and the liquid cooling circulating pipeline is sealed by a silica gel sealing ring.
6. The double-layer test tool for the kilowatt high-power supply module according to claim 1, wherein the liquid cooling circulating pipeline in the metal substrate is bent and distributed.
7. The double-layer test tool for the kilowatt high-power supply module according to claim 1, wherein the inlet check valve is positioned at one end of the electromagnet which is firstly close to the arc-shaped pipeline, and the outlet check valve is positioned at the other end of the arc-shaped pipeline.
8. The double-layer testing tool for the kilowatt high-power supply module according to claim 1, wherein the check valves are arranged at the positions where the two ends of the arc-shaped pipeline are communicated with the liquid cooling circulating pipeline.
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| CN201811474155.3A CN109406904B (en) | 2018-12-04 | 2018-12-04 | Double-layer testing tool for kilowatt high-power supply module |
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| CN201811474155.3A CN109406904B (en) | 2018-12-04 | 2018-12-04 | Double-layer testing tool for kilowatt high-power supply module |
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| CN110579721A (en) * | 2019-10-14 | 2019-12-17 | 国网山东省电力公司莱芜供电公司 | High-power supply load instrument |
| CN111231318A (en) * | 2020-01-16 | 2020-06-05 | 王浩怡 | From heat dissipation type 3D printing material tray |
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| CN2665371Y (en) * | 2003-09-30 | 2004-12-22 | 王占秋 | Energy conserving engine cooling apparatus |
| CN100582604C (en) * | 2004-06-03 | 2010-01-20 | 西安交通大学 | A vapor-liquid two-phase thermoacoustic refrigeration device |
| JP4572907B2 (en) * | 2007-03-29 | 2010-11-04 | トヨタ自動車株式会社 | Motor control device, control method, and control program |
| CN202034362U (en) * | 2011-04-28 | 2011-11-09 | 苏州科医世凯半导体技术有限责任公司 | Composite substrate for high-power element |
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| CN108127176A (en) * | 2017-12-20 | 2018-06-08 | 重庆家本家科技有限公司 | The cutting device of refrigerator thermal column |
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Inventor after: Gu Cheng Inventor after: Qiao Xiuming Inventor after: Zhang Xiaoyu Inventor after: Liu Dunwei Inventor after: Lv Le Inventor before: Gu Cheng Inventor before: Qiao Xiuming Inventor before: Liu Xiaoyu Inventor before: Liu Dunwei Inventor before: Lv Le |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |