CN111525820A - Inverter and assembly process thereof - Google Patents
Inverter and assembly process thereof Download PDFInfo
- Publication number
- CN111525820A CN111525820A CN202010519844.2A CN202010519844A CN111525820A CN 111525820 A CN111525820 A CN 111525820A CN 202010519844 A CN202010519844 A CN 202010519844A CN 111525820 A CN111525820 A CN 111525820A
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- Prior art keywords
- fins
- power tube
- shell
- circuit board
- row
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/209—Heat transfer by conduction from internal heat source to heat radiating structure
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses an inverter and an assembly process thereof, wherein the inverter comprises a shell and a circuit board arranged in the shell, wherein a power tube is welded on one side of the circuit board facing the shell, the power tube is attached to the circuit board, and the heat dissipation surface of the power tube faces the shell; the circuit board is fixedly arranged on the shell through screws, so that the heat dissipation side of the power tube is pressed on the shell. The inverter has the advantages of reasonable structure, simplicity in assembly, lower production cost, good heat dissipation effect and the like.
Description
Technical Field
The invention relates to the technical field of electronic component assembly, in particular to a welding assembly process of an inverter and a power tube.
Background
The inverter is a converter which converts direct current electric energy (batteries and storage batteries) into constant-frequency constant-voltage or frequency-modulation voltage-regulation alternating current (generally 220V,50Hz sine wave). When the inverter works, a large amount of heat is generated, heat needs to be dissipated timely, and otherwise the inverter is easy to shut down due to overhigh temperature. The power tube is one of the core components of the inverter, the heat generation amount of the power tube is large, and the heat dissipation performance of the power tube also affects the heat dissipation performance of the inverter. At present, a power tube of an inverter is mainly inserted into an aluminum substrate through pins, the pins are bent to make a heat dissipation surface of the power tube adhere to the aluminum substrate, then the aluminum substrate is installed inside a housing, and heat of the power tube is conducted to the aluminum substrate and then conducted to fins on the housing through the housing. However, in this structure, the power tube needs to be inserted and welded on the aluminum substrate, which is not beneficial to automatic welding, and the power tube and the housing have two contact surfaces as an intermediate medium for heat transfer through the aluminum substrate, which affects heat transfer efficiency.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: how to provide an inverter and the assembly process of the inverter that have reasonable structure, simple assembly, are favorable to realizing automatic welding, reduction in production cost and improvement radiating effect.
In order to solve the technical problems, the invention adopts the following technical scheme:
an inverter is characterized by comprising a shell and a circuit board arranged in the shell, wherein a power tube is welded on one side of the circuit board, which faces the shell, the power tube is attached to the circuit board, the radiating surface of the power tube faces the shell, two bending parts are arranged on pins of the power tube, the bending part, which is close to the power tube, is bent along the direction deviating from the radiating surface of the power tube, the other bending part is bent along the direction far away from the power tube, so that one side, which deviates from the radiating surface of the power tube, of the pins is flush with the surface of the power tube, and the power tube is attached to the circuit board; the circuit board is fixedly arranged on the shell through screws, so that the heat dissipation side of the power tube is pressed on the shell.
By adopting the structure, after the power tube is welded on the circuit board, the radiating surface of the power tube always faces one side of the shell, and when the circuit board is installed on the shell through the screw, the power tube welded on the circuit board is tightly attached to the shell under the pressure action of the circuit board. Because the power tube is directly contacted with the shell to conduct heat, the number of intermediate conductors is reduced, and the heat can be more efficiently transferred to the shell, thereby being beneficial to improving the heat dissipation of the inverter.
Furthermore, the inner side of the shell is provided with a protruding top block, the height of the top block is matched with the thickness of the power tube, and the top block is close to a pressing area on the shell, which presses the power tube; and a threaded hole for fixing the circuit board is arranged between the top block and the pressing area.
Therefore, when the pressing force is applied to the circuit board by the screws, the pressing force of the screws can be reliably applied to the power tube by the circuit board under the upward reverse acting force of the top block, so that the power tube is firmly attached to the shell.
Furthermore, the pressing area on the inner side of the shell for pressing the power tube is recessed inwards, so that the circuit board and the inner side of the shell are close to each other.
Because the power tube is thicker than other components on the side, the pressing area on the inner side of the shell is sunken, the circuit board is close to the inner side of the shell as much as possible, the overall size of the inverter is reduced, and heat on the circuit board can be better transferred to the shell to be radiated.
Further, fins are integrally formed on the surface of the shell, the fins are arranged on the shell in rows, and each row is provided with a plurality of fins arranged at intervals along the length direction; in two adjacent rows of fins, the fins on one row are opposite to the interval position between two adjacent fins on the other row, and the length of the fins is matched with the distance between the two fins at the interval position.
In the structure, because the fins are opposite to the spacing positions between the two fins on the adjacent row, the fins are arranged on the shell in a staggered manner, so that the airflow in the fin direction can smoothly flow through the gaps between the fins, and the airflow in a certain angle or even in the direction perpendicular to the fins can flow through the spacing positions on the fins of each row, thereby being favorable for the heat dissipation of the fins. Meanwhile, the length of the fins is matched with the length of the opposite interval position on the other row, so that the sum of the lengths of all the fins on the two adjacent rows is close to the length of the integrally formed fins on the same row on the traditional shell, and the shell arranged in a staggered mode is lighter in weight on the shell provided with the fins in the same row, and the light weight is favorably realized.
Further, in two adjacent rows of the fins, the projection of the fin in the thickness direction on one row is intersected with the projection of the two fins in the thickness direction at the opposite interval position on the other row.
Like this, just so make the both ends that are located the dislocation fin in middle part all stretch into between two fins that are just right each other, make the air current flow through the back between two fins that are just right each other of first group, can be in the dislocation fin department of locating in the middle of being divided into two, make the air current fully contact with the dislocation fin surface of middle, carry out the heat exchange, and after the dislocation fin in the middle of the process, still under the separating effect of its tip, make the air current fully contact with two fin surfaces that are just right each other of second group and carry out the heat exchange, all fins of so repeated flowing through, the air current is more abundant with the contact on fin surface, heat exchange efficiency is higher, the radiating effect is better.
Further, the length of the fin is gradually reduced towards the middle part along the direction departing from the shell; in two adjacent rows of fins, the length of the bottom of the fin on one row is greater than the distance between the bottoms of the two fins at the opposite spacing position on the other row, and the length of the top of the fin is less than the distance between the tops of the two fins at the opposite spacing position on the other row.
In this way, the projections of the fins in the thickness direction of the adjacent two rows of fins intersect at the bottom position and are spaced from each other at the top position, so that the airflow in the thickness direction of the fins can flow through the space between the fins and the top position.
Further, the cross-sectional area of the fin parallel to the surface of the housing is gradually reduced in a direction away from the housing.
Because outwards progressively dispel by the casing on the heat to can form the gradient that the temperature descends along keeping away from the direction of casing, the cross sectional area of fin diminishes along root to top direction gradually, can be satisfying under the condition of heat transfer gradient, the volume of minimizing the fin, alleviate whole weight. In addition, the structure enables the side surfaces of the fins to be inclined, and compared with the arrangement that the side surfaces are vertical to the shell, the structure is favorable for increasing the surface area of the fins and heat dissipation; and the structure also enables the distance between the tops of the fins to be larger, thereby being beneficial to air circulation and improving heat dissipation.
Furthermore, the section of the fin parallel to the surface of the shell is integrally in a long strip shape, and the two sides in the thickness direction are in a circular arc shape with the middle part protruding outwards.
Therefore, the surface area of the fins can be increased by the arc-shaped surface, the middle parts of the two sides of the thickness of the fins are protruded outwards, the distance between the two opposite fins can be shortened, the pressure can be changed by the change of the distance between the two fins when air flows, the air can be enabled to better approach the surface of the fins to flow, and the radiating effect is improved.
The assembly process of the inverter is characterized by comprising the following steps of welding a power tube on a circuit board, enabling the radiating surface of the power tube to be attached to the circuit board outwards, enabling one side, welded with the power tube, of the circuit board to face a shell after the circuit board is completely welded, fixedly installing the circuit board on the shell through bolts, and enabling the power tube to be attached to the shell in a pressing mode.
In conclusion, the inverter has the advantages of reasonable structure, simplicity in assembly, low production cost, good heat dissipation effect and the like.
Drawings
Fig. 1 is a schematic view of the overall structure of the inverter.
Fig. 2 is a schematic view of a bending structure of a power tube.
Fig. 3 is a schematic structural diagram of the circuit board and the power tube.
FIG. 4 is a schematic view of a fin projection.
Fig. 5 is a schematic view of an installation structure among the power tube, the circuit board, the top block and the housing.
Detailed Description
The present invention will be described in further detail with reference to examples.
In the specific implementation: as shown in fig. 1 to 5, an inverter includes a housing 1 and a circuit board 3 installed in the housing 1, a power tube 4 is welded on one side of the circuit board 3 facing the housing 1, a heat dissipation surface of the power tube 4 faces the housing 1, as shown in fig. 2, two bending portions are provided on a pin of the power tube 4, the bending portion near the power tube 4 is bent along a direction away from the heat dissipation surface, the other bending portion is bent along a direction away from the power tube 4, so that one side of the pin facing away from the heat dissipation surface of the power tube is flush with the surface of the power tube 4, and the power tube 4 is welded on the circuit board 3; the circuit board 3 is fixedly mounted on the shell 1 through screws, so that the heat dissipation side of the power tube 4 is pressed on the shell 1, and an insulating layer is arranged between the power tube 4 and the shell 1.
Therefore, the pins of the power tube are bent along the direction deviating from the heat dissipation surface of the power tube, so that one side of the back heat dispersion surface of the power tube is flush with the surface of the bent pins. Therefore, the pins of the power tube do not need to penetrate through the jacks at the welding positions on the circuit board for manual welding, but can be attached to the welding positions on the circuit board, automatic welding is carried out through equipment, the labor cost is reduced, and the welding quality can be controlled. And after the power tube is bent by adopting the structure, the radiating surface of the power tube welded on the circuit board always faces one side of the shell, and when the circuit board is installed on the shell through a screw, the power tube welded on the circuit board is tightly attached to the shell under the pressure action of the circuit board. Because the power tube is directly contacted with the shell to conduct heat, the number of intermediate conductors is reduced, and the heat can be more efficiently transferred to the shell, thereby being beneficial to improving the heat dissipation of the inverter.
Specifically, as shown in fig. 5, a protruding top block 5 is provided on the inner side of the housing 1, and the height of the top block 5 matches the thickness of the power tube 4 and is close to the pressing area of the housing 1 pressing the power tube 4; and a threaded hole for fixing the circuit board 3 is arranged between the top block 5 and the pressing area.
Therefore, when the pressing force is applied to the circuit board by the screws, the pressing force of the screws can be reliably applied to the power tube by the circuit board under the upward reverse acting force of the top block, so that the power tube is firmly attached to the shell.
In order to further reduce the size of the inverter, in the present embodiment, the pressing region on the inner side of the housing 1 for pressing the power tube 4 is recessed inward, so that the circuit board 3 and the inner side of the housing 1 are close to each other.
Because the power tube is thicker than other components on the side, the pressing area on the inner side of the shell is sunken, the circuit board is close to the inner side of the shell as much as possible, the overall size of the inverter is reduced, and heat on the circuit board can be better transferred to the shell to be radiated.
In order to better dissipate heat, in the present embodiment, as shown in fig. 1, fins 2 are integrally formed on a surface of the housing 1, the fins 2 are arranged on the housing 1 in rows, and each row has a plurality of fins 2 arranged at intervals along a length direction; in two adjacent rows of fins, the fins on one row are opposite to the interval position between two adjacent fins on the other row, and the length of the fins is matched with the distance between the two fins at the interval position.
In the structure, because the fins are opposite to the spacing positions between the two fins on the adjacent row, the fins are arranged on the shell in a staggered manner, so that the airflow in the fin direction can smoothly flow through the gaps between the fins, and the airflow in a certain angle or even in the direction perpendicular to the fins can flow through the spacing positions on the fins of each row, thereby being favorable for the heat dissipation of the fins. Meanwhile, the length of the fins is matched with the length of the opposite interval position on the other row, so that the sum of the lengths of all the fins on the two adjacent rows is close to the length of the integrally formed fins on the same row on the traditional shell, and the shell arranged in a staggered mode is lighter in weight on the shell provided with the fins in the same row, and the light weight is favorably realized.
In practice, in two adjacent rows of the fins, the projection of the fin in the thickness direction on one row is intersected with the projection of the two fins in the thickness direction at the opposite interval position on the other row. Specifically, in the present embodiment, as shown in fig. 4, the length of the fin 2 gradually decreases toward the middle in the direction away from the housing 1; in two adjacent rows of fins, the length of the bottom of the fin on one row is greater than the distance between the bottoms of the two fins at the opposite spacing position on the other row, and the length of the top of the fin is less than the distance between the tops of the two fins at the opposite spacing position on the other row.
Like this, just so make the both ends that are located the dislocation fin in middle part all stretch into between two fins that are just right each other, make the air current flow through the back between two fins that are just right each other of first group, can be in the dislocation fin department of locating in the middle of being divided into two, make the air current fully contact with the dislocation fin surface of middle, carry out the heat exchange, and after the dislocation fin in the middle of the process, still under the separating effect of its tip, make the air current fully contact with two fin surfaces that are just right each other of second group and carry out the heat exchange, all fins of so repeated flowing through, the air current is more abundant with the contact on fin surface, heat exchange efficiency is higher, the radiating effect is better. Furthermore, projections of two adjacent rows of fins in the thickness direction of the fins intersect at the bottom position and are spaced from each other at the top position, so that airflow in the thickness direction of the fins can flow through the fins at the interval close to the top position.
In this embodiment, to further reduce the weight, the cross-sectional area of the fin 2 parallel to the surface of the housing is gradually reduced in a direction away from the housing 1.
Because outwards progressively dispel by the casing on the heat to can form the gradient that the temperature descends along keeping away from the direction of casing, the cross sectional area of fin diminishes along root to top direction gradually, can be satisfying under the condition of heat transfer gradient, the volume of minimizing the fin, alleviate whole weight. In addition, the structure enables the side surfaces of the fins to be inclined, and compared with the arrangement that the side surfaces are vertical to the shell, the structure is favorable for increasing the surface area of the fins and heat dissipation; and the structure also enables the distance between the tops of the fins to be larger, thereby being beneficial to air circulation and improving heat dissipation.
Meanwhile, the section of the fin 2 parallel to the surface of the shell is integrally in a long strip shape, and the two sides in the thickness direction are arc-shaped with the middle part protruding outwards.
Therefore, the surface area of the fins can be increased by the arc-shaped surface, the middle parts of the two sides of the thickness of the fins are protruded outwards, the distance between the two opposite fins can be shortened, the pressure can be changed by the change of the distance between the two fins when air flows, the air can be enabled to better approach the surface of the fins to flow, and the radiating effect is improved.
During assembly, the pins of the power tube 4 are bent as shown in fig. 2, then the power tube 4 is attached to the welding position of the circuit board 3, the power tube 4 is welded on the circuit board through automatic welding equipment, after all components on the circuit board 3 are welded, one side of the circuit board 3, on which the power tube 4 is welded, faces the shell 1, the circuit board 3 is fixedly installed on the shell through bolts, and the power tube 4 is pressed on the shell. During assembly, the power tube 4 is reliably pressed against the shell by controlling the torque and the screwing depth of the screw.
The above description is only exemplary of the present invention and should not be taken as limiting, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. An inverter is characterized by comprising a shell (1) and a circuit board (3) installed in the shell (1), wherein a power tube (4) is welded on one side, facing the shell (1), of the circuit board (3), the power tube (4) is attached to the circuit board (3), and the heat dissipation surface of the power tube faces the shell (1); the circuit board (3) is fixedly mounted on the shell (1) through screws, so that the heat dissipation side of the power tube (4) is pressed on the shell (1).
2. The inverter according to claim 1, characterized in that the inside of the housing (1) has a protruding top block (5), the height of the top block (5) matches the thickness of the power tube (4) and is close to the pressing area of the housing (1) pressing the power tube (4); and a threaded hole for fixing the circuit board (3) is formed between the top block (5) and the pressing area.
3. The inverter according to claim 1, wherein a press-fitting region of an inner side of the case (1) for press-fitting the power tube (4) is recessed inward so that the circuit board (3) and the inner side of the case (1) are close to each other.
4. The inverter according to claim 1, wherein the surface of the housing (1) is integrally formed with fins (2), the fins (2) being arranged in rows on the housing (1), each row having a plurality of the fins (2) arranged at intervals in a length direction; in two adjacent rows of fins, the fins on one row are opposite to the interval position between two adjacent fins on the other row, and the length of the fins is matched with the distance between the two fins at the interval position.
5. The inverter of claim 4, wherein a projection of the fins in the thickness direction on one of the two adjacent rows of fins intersects a projection of the two fins in the thickness direction at the diametrically opposed spaced locations on the other row.
6. An inverter according to claim 4, characterized in that the length of the fins (2) decreases gradually towards the middle in a direction away from the housing (1); in two adjacent rows of fins, the length of the bottom of the fin on one row is greater than the distance between the bottoms of the two fins at the opposite spacing position on the other row, and the length of the top of the fin is less than the distance between the tops of the two fins at the opposite spacing position on the other row.
7. An inverter according to claim 4, characterized in that the cross-sectional area of the fins (2) parallel to the housing surface is tapered in a direction away from the housing (1).
8. The inverter according to claim 4, wherein the fin (2) has an elongated shape in cross section parallel to the surface of the case as a whole, and has a circular arc shape with a middle portion projecting outward at both sides in the thickness direction.
9. The assembly process of the inverter is characterized by comprising the following steps of welding a power tube (4) on a circuit board (3), enabling the radiating surface of the power tube (4) to be attached to the circuit board (3) outwards, enabling one side, welded with the power tube (4), of the circuit board (3) to face a shell (1) after the circuit board (3) is completely welded, fixedly installing the circuit board (3) on the shell through bolts, and enabling the power tube (4) to be attached to the shell in a pressing mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010519844.2A CN111525820B (en) | 2020-06-09 | 2020-06-09 | Inverter and assembly process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010519844.2A CN111525820B (en) | 2020-06-09 | 2020-06-09 | Inverter and assembly process thereof |
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| Publication Number | Publication Date |
|---|---|
| CN111525820A true CN111525820A (en) | 2020-08-11 |
| CN111525820B CN111525820B (en) | 2021-02-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010519844.2A Active CN111525820B (en) | 2020-06-09 | 2020-06-09 | Inverter and assembly process thereof |
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| Country | Link |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103298317A (en) * | 2012-02-24 | 2013-09-11 | 三菱电机株式会社 | Cooler and cooling device |
| CN103415181A (en) * | 2013-07-19 | 2013-11-27 | 徐州云泰汽车电器有限公司 | Structure and assembly method of high-power controller for electric car |
| CN203368998U (en) * | 2013-07-31 | 2013-12-25 | 江苏云意电气股份有限公司 | Double-row power tube electric-vehicle controller |
| CN210075878U (en) * | 2019-01-29 | 2020-02-14 | 科比传动技术（上海）有限公司 | Heat abstractor and contain its converter |
| CN210226030U (en) * | 2018-03-12 | 2020-03-31 | 宗拓贝尔照明器材有限公司 | Electronic assembly having a housing with heat sink fins |
| CN210444575U (en) * | 2019-08-01 | 2020-05-01 | 广东速展投资有限公司 | Compact mainboard structure for power amplifier |
| CN212013426U (en) * | 2020-06-09 | 2020-11-24 | 重庆宗申电子科技有限公司 | Shell heat radiation structure and inverter |
-
2020
- 2020-06-09 CN CN202010519844.2A patent/CN111525820B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103298317A (en) * | 2012-02-24 | 2013-09-11 | 三菱电机株式会社 | Cooler and cooling device |
| CN103415181A (en) * | 2013-07-19 | 2013-11-27 | 徐州云泰汽车电器有限公司 | Structure and assembly method of high-power controller for electric car |
| CN203368998U (en) * | 2013-07-31 | 2013-12-25 | 江苏云意电气股份有限公司 | Double-row power tube electric-vehicle controller |
| CN210226030U (en) * | 2018-03-12 | 2020-03-31 | 宗拓贝尔照明器材有限公司 | Electronic assembly having a housing with heat sink fins |
| CN210075878U (en) * | 2019-01-29 | 2020-02-14 | 科比传动技术（上海）有限公司 | Heat abstractor and contain its converter |
| CN210444575U (en) * | 2019-08-01 | 2020-05-01 | 广东速展投资有限公司 | Compact mainboard structure for power amplifier |
| CN212013426U (en) * | 2020-06-09 | 2020-11-24 | 重庆宗申电子科技有限公司 | Shell heat radiation structure and inverter |
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| Publication number | Publication date |
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| CN111525820B (en) | 2021-02-05 |
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