Novel packaging structure of clamping type power module

Abstract

The utility model discloses a novel packaging structure of a clamping type power module, which relates to the technical field of semiconductor power modules and comprises a power module, the top of the power module is lapped with a cover plate, the front and rear parts of the top of the power module are respectively provided with a sealing groove I, and the left and right positions of the top of the power module are respectively provided with a sealing groove II. A second sealing strip is fixedly connected to the middle of the left-right position of the bottom of the cover plate. According to the utility model, through the cooperation between the limiting plate and the rectangular clamping groove, when the outer wall of the limiting plate is in contact with the outer wall of the top of the power module, the limiting plate deforms when moving downwards due to the chamfered angle at the bottom of the limiting plate, and when the limiting plate moves downwards to a certain distance, the limiting plate deforms. And the bottom of the limiting plate is clamped with a rectangular groove formed in the top of the power module, so that the cover plate and the power module are limited, the cover plate is prevented from falling off easily, and the limiting effect is achieved.

Description

Technical Field

[0001] This utility model relates to the field of semiconductor power module technology, specifically a novel packaging structure for a snap-on power module. Background Technology

[0002] Currently, semiconductor power modules are widely used in industrial control fields such as electrical drives and motor control, as well as in drive control fields such as automotive drives, hybrid power, wind power, welding machines, and locomotive traction. They are primarily used to convert input DC power into three-phase AC power output as various switching power supplies. However, existing power modules are mostly packaged using screws or directly sealed with sealant. One method is slow, and the other makes repair difficult when the power module malfunctions, reducing the practicality of the device.

[0003] For example, a power module packaging structure described in patent CN212485301U includes: a base plate; a substrate disposed on the base plate, with a semiconductor chip placement area on the substrate; a semiconductor chip, corresponding to the semiconductor chip placement area on the substrate; encapsulating adhesive, which wraps the substrate and the semiconductor chip; a housing; a cover plate, the cover plate, housing, and base plate constituting a packaging shell, encapsulating the substrate, semiconductor chip, and encapsulating adhesive; and a sealant, which is disposed at the joint between the cover plate and the housing, and between the housing and the base plate. This invention can prevent the intrusion of external corrosive gases, thereby effectively avoiding corrosion damage to the power module and improving its service life in corrosive environments. Furthermore, it can isolate the encapsulating adhesive and the sealant, thus avoiding insulation failure caused by CTE mismatch between the encapsulating adhesive and the sealant, thereby improving the reliability of the power module. Existing technologies use sealant to directly encapsulate the power module, resulting in the power module being in a sealed state after encapsulation, making it difficult to disassemble. Consequently, when the power module malfunctions, it is difficult to repair, requiring complete replacement and reducing the practicality of the device.

[0004] Based on this, a novel packaging structure for a snap-fit ​​power module is now provided, which can eliminate the drawbacks of existing devices. Utility Model Content

[0005] The purpose of this invention is to provide a novel packaging structure for a snap-fit ​​power module to solve the problems in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A novel packaging structure for a snap-fit ​​power module includes a power module with a cover plate overlapping its top. Sealing grooves are formed on both the front and rear sides of the top of the power module, and sealing grooves are formed on both the left and right sides of the top of the power module. A sealing strip is fixedly connected to the center of the left and right sides of the bottom of the cover plate, with the outer wall of the sealing strip interlocking with the interior of the sealing groove. Sealing strips are also fixedly connected to both the front and rear sides of the cover plate, with the outer wall of the sealing strip interlocking with the inner wall of the sealing groove. A dustproof ring is fixedly connected to the bottom of the cover plate, with its inner wall interlocking with the top of the cover plate. Limiting mechanisms are provided on the left and right sides of the power module, and a snap-fit ​​mechanism is provided on the top of the power module.

[0008] Based on the above technical solutions, this utility model also provides the following optional technical solutions:

[0009] In one alternative: the depth and width of the sealing groove one and the sealing groove two are respectively adapted to the sealing strip one and the sealing strip two.

[0010] In one alternative: the limiting mechanism includes a limiting plate, the top of the limiting plate is fixedly connected to the middle position of the bottom of the cover plate, the bottom of the limiting plate is engaged with the inner wall of the power module, and a pull plate is fixedly connected to the bottom of the limiting plate.

[0011] In one alternative: the bottom of the limiting plate protrudes to one side, and the bottom of the protruding part is beveled.

[0012] In one alternative: rectangular slots are provided on the top of both the left and right sides of the power module, and the height of the rectangular slots is greater than the thickness of the protruding part at the bottom of the limiting plate.

[0013] In one alternative embodiment: the locking mechanism includes a fixing block, the top of which is fixedly connected to the left and right positions of the bottom of the cover plate, the outer wall of which is inserted into the inner cavity of the top of the power module, connecting plates fixedly connected to the front and rear positions of the bottom of the fixing block, a rotating shaft rotatably connected to the bottom of the connecting plates, one end of which is rotatably connected to the inner wall of the cover plate, a locking block fixedly connected to the outer wall of the rotating shaft between the two connecting plates, the outer wall of the locking block locking into the inner cavity of the top of the power module, and torsion springs provided on both the front and rear parts of the outer wall of the rotating shaft, one end of which is fixedly connected to the inner cavity of the top of the power module.

[0014] In one alternative: irregular slots are provided at both the front and rear positions of the top of the power module. The width of the top of the irregular slot is greater than the width of the bottom, and the top of the irregular slot is adapted to the fixing block. The width of the bottom of the irregular slot is greater than the width of the locking block.

[0015] In one alternative: the snap-fit ​​block is L-shaped, and the bottom of the snap-fit ​​block has rounded corners.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. This utility model achieves the following effect through the cooperation between the limiting plate and the rectangular slot: when the outer wall of the limiting plate contacts the outer wall of the top of the power module, the limiting plate deforms when it moves downward due to the chamfer at the bottom. When the limiting plate moves downward a certain distance, the bottom of the limiting plate engages with the rectangular slot opened at the top of the power module, thereby limiting the cover plate and the power module and preventing the cover plate from easily falling off, thus achieving the limiting effect.

[0018] 2. This utility model achieves the insertion of the snap-fit ​​block into the irregular slot at the top of the power module through the cooperation of the fixing block, rotating shaft, snap-fit ​​block, and torsion spring. During the snap-fit ​​process, as the snap-fit ​​block moves downward, the rounded corners at the bottom of the snap-fit ​​block cause the rotating shaft to rotate, which in turn causes the torsion spring to rotate. When the snap-fit ​​block moves downward a certain distance, under the action of the elastic force of the torsion spring, the bottom of the snap-fit ​​block engages with the irregular slot at the top of the inner cavity of the power module. At the same time, sealing strip one and sealing strip two seal with sealing groove one and sealing groove two, respectively. Simultaneously, the fixing block is fully inserted into the top of the irregular slot, thereby completing the encapsulation and accelerating the encapsulation efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0020] Figure 2 This is a partial cross-sectional structural diagram of the power module of this utility model.

[0021] Figure 3 This is a schematic diagram of the structure of the cover plate of this utility model.

[0022] Figure 4 This is a schematic diagram of the limiting mechanism of this utility model.

[0023] Figure 5 This is a schematic diagram of the card mechanism of this utility model.

[0024] Figure label annotations: 1. Power module; 11. Cover plate; 12. Sealing groove one; 13. Sealing groove two; 14. Sealing strip one; 15. Sealing strip two; 16. Dustproof ring; 2. Limiting mechanism; 21. Limiting plate; 22. Pull plate; 3. Snap-fit ​​mechanism; 31. Fixing block; 32. Connecting plate; 33. Rotating shaft; 34. Snap-fit ​​block; 35. Torsion spring. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] In one embodiment, such as Figures 1-3 As shown, a novel packaging structure for a snap-fit ​​power module includes a power module 1. A cover plate 11 overlaps the top of the power module 1. Sealing grooves 12 are provided on both the front and rear sides of the top of the power module 1. Sealing grooves 13 are provided on both the left and right sides of the top of the power module 1. Sealing strips 15 are fixedly connected to the middle of the left and right sides of the bottom of the cover plate 11. The outer wall of the sealing strips 15 is inserted into the inside of the sealing grooves 13. Sealing strips 14 are fixedly connected to both the front and rear sides of the cover plate 11. The outer wall of the sealing strips 14 is inserted into the inner wall of the sealing grooves 13. A dustproof ring 16 is fixedly connected to the bottom of the cover plate 11. The inner wall of the dustproof ring 16 is inserted into the top of the cover plate 11. Limiting mechanisms 2 are provided on the left and right sides of the power module 1. A snap-fit ​​mechanism 3 is provided on the top of the power module 1.

[0027] In this embodiment, by placing the cover plate 11 on top of the power module 1, the sealing strip 14 at the bottom of the cover plate 11 is embedded into the sealing groove 12, and the sealing strip 15 is embedded into the sealing groove 13, thereby ensuring the sealing of the power module 1. At the same time, the snap-fit ​​mechanism 3 connects the cover plate 11 and the power module 1, while the limiting mechanism 2 limits the cover plate 11 and the power module 1 to make the connection tighter and prevent them from easily coming apart.

[0028] In an optional embodiment, such as Figure 2 and Figure 3 As shown, the depth and width of sealing groove 12 and sealing groove 23 are adapted to sealing strip 14 and sealing strip 25 respectively. Through the adaptation of sealing groove 12 and sealing groove 23 to sealing strip 14 and sealing strip 25, the overall sealing performance is better.

[0029] In an optional embodiment, such as Figures 2-4 As shown, the limiting mechanism 2 includes a limiting plate 21. The top of the limiting plate 21 is fixedly connected to the middle position of the bottom of the cover plate 11. The bottom of the limiting plate 21 is engaged with the inner wall of the power module 1. A pull plate 22 is fixedly connected to the bottom of the limiting plate 21. When the outer wall of the limiting plate 21 contacts the outer wall of the top of the power module 1, the limiting plate 21 deforms when it moves downward due to the chamfer at the bottom of the limiting plate 21. When the limiting plate 21 moves downward a certain distance, the bottom of the limiting plate 21 engages with the rectangular groove opened at the top of the power module 1.

[0030] In an optional embodiment, such as Figure 4As shown, the bottom of the limiting plate 21 protrudes to one side, and the bottom of the protruding part is chamfered. Through the chamfer of the bottom protruding part of the limiting plate 21, the limiting plate 21 can deform to a certain extent when it moves downward, so as to facilitate the cover plate 11 to cover the power module 1.

[0031] In an optional embodiment, such as Figure 2 and Figure 4 As shown, rectangular slots are provided on the top of both the left and right sides of the power module 1. The height of the rectangular slots is greater than the thickness of the protruding part at the bottom of the limiting plate 21. This makes it easier for the limiting plate 21 to get into the rectangular slots after it has moved a certain distance.

[0032] In an optional embodiment, such as Figure 2 and Figure 5 As shown, the snap-fit ​​mechanism 3 includes a fixing block 31. The top of the fixing block 31 is fixedly connected to the left and right positions of the bottom of the cover plate 11. The outer wall of the fixing block 31 is inserted into the inner cavity of the top of the power module 1. Connecting plates 32 are fixedly connected to the front and rear positions of the bottom of the fixing block 31. A rotating shaft 33 is rotatably connected to the bottom of the connecting plate 32. One end of the rotating shaft 33 is rotatably connected to the inner wall of the cover plate 11. A snap-fit ​​block 34 is fixedly connected to the outer wall of the rotating shaft 33 at the position between the two connecting plates 32. The outer wall of the snap-fit ​​block 34 snaps into the inner cavity of the top of the power module 1. Both the front and rear parts of the outer wall of the rotating shaft 33 are provided with torsion springs 35. One end of the torsion spring 35 is fixedly connected to the inner cavity of the top of the power module 1. When the cover plate 11 is placed on the power module 1, when the locking block 34 moves downward, due to the rounded corner at the bottom of the locking block 34, the locking block 34 drives the rotating shaft 33 to rotate, which in turn drives the torsion spring 35 to rotate. When the locking block 34 moves downward a certain distance, under the action of the elastic force of the torsion spring 35, the bottom of the locking block 34 engages with the irregular slot at the top of the inner cavity of the power module 1, thereby completing the engagement.

[0033] In an optional embodiment, such as Figure 2 As shown, irregular slots are provided at both the front and rear positions of the top of the power module 1. The width of the top of the irregular slot is greater than the width of the bottom, and the top of the irregular slot is adapted to the fixing block 31. The width of the bottom of the irregular slot is greater than the width of the snap-fit ​​block 34. The irregular slot can accommodate the fixing block 31, so that there is no gap between the cover plate 11 and the power module 1. At the same time, the width of the irregular slot provides enough space for the snap-fit ​​block 34 to rotate, so that it will not become dry.

[0034] In an optional embodiment, such as Figure 5As shown, the snap-fit ​​block 34 is L-shaped and has rounded corners at the bottom. The rounded corners at the bottom of the snap-fit ​​block 34 make it easier to snap-fit ​​during the snap-fit ​​process. At the same time, it will also create a certain resistance when it is removed, preventing the cover plate 11 from falling off easily.

[0035] The above embodiment discloses a novel packaging structure for a snap-fit ​​power module. When packaging the power module 1, a cover plate 11 is placed on top of the power module 1, with the sealing strip 14 at the bottom of the cover plate 11 embedded in the sealing groove 12 and the sealing strip 15 embedded in the sealing groove 13. Simultaneously, a snap-fit ​​block 34 is inserted into an irregular slot on the top of the power module 1. During the snap-fit ​​process, the outer wall of the limiting plate 21 contacts the outer wall of the top of the power module 1. Due to the chamfered angle at the bottom of the limiting plate 21, the limiting plate 21... When moving downwards, deformation occurs (where the limiting plate 21 is an elastic element). Simultaneously, as the locking block 34 moves downwards, due to the rounded corners at its bottom, it drives the rotating shaft 33 to rotate, causing the rotating shaft 33 to drive the torsion spring 35 to rotate. When the limiting plate 21 and locking block 34 move downwards a certain distance, the bottom of the limiting plate 21 engages with the rectangular slot at the top of the power module 1. Under the elastic force of the torsion spring 35, the bottom of the locking block 34 engages with the irregular slot at the top of the inner cavity of the power module 1. At the same time, the sealing strip 1... 4 and sealing strip 15 respectively seal with sealing groove 12 and sealing groove 13, while fixing block 31 is fully inserted into the top of the irregular slot, thus completing the encapsulation and speeding up the encapsulation efficiency. At the same time, the cooperation between sealing groove 12, sealing groove 13, sealing strip 14, sealing strip 15 and dust ring 16 ensures the sealing of power module 1, preventing dust and water from entering the power module 1, thus achieving the sealing effect. After the snap-fit ​​is completed, the snap-fit ​​of limiting plate 21 with the rectangular slot limits the cover plate 11, so that the cover plate 1 1. It cannot be opened directly. You need to pull the pull plate 22 first to deform the limiting plate 21 so that the bottom of the limiting plate 21 is no longer engaged with the rectangular groove. Then pull the cover plate 11 upward to remove the cover plate 11. In summary, the locking mechanism 3 enables the cover plate 11 to be quickly locked with the power module 1. At the same time, the limiting mechanism 2 limits the cover plate 11 so that the cover plate 11 cannot be easily separated from the power module 1. After the power module 1 and the cover plate 11 are sealed, the cooperation between the various sealing strips and sealing grooves ensures the sealing of the power module 1.

[0036] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A novel packaging structure for a snap-fit ​​power module, comprising a power module (1), wherein a cover plate (11) overlaps the top of the power module (1), characterized in that, The power module (1) has a sealing groove 1 (12) on both the front and back of the top, and a sealing groove 2 (13) on both the left and right sides of the top. A sealing strip 2 (15) is fixedly connected to the middle of the left and right sides of the bottom of the cover plate (11). The outer wall of the sealing strip 2 (15) is inserted into the inside of the sealing groove 2 (13). A sealing strip 1 (14) is fixedly connected to both the front and back of the cover plate (11). The outer wall of the sealing strip 1 (14) is inserted into the inner wall of the sealing groove 2 (13). A dustproof ring (16) is fixedly connected to the bottom of the cover plate (11). The inner wall of the dustproof ring (16) is inserted into the top of the cover plate (11). Limiting mechanisms (2) are provided on the left and right sides of the power module (1). A snap-fit ​​mechanism (3) is provided on the top of the power module (1).

2. The novel packaging structure of a snap-on power module according to claim 1, characterized in that, The depth and width of the sealing groove one (12) and sealing groove two (13) are adapted to the sealing strip one (14) and sealing strip two (15), respectively.

3. The novel packaging structure of a snap-on power module according to claim 1, characterized in that, The limiting mechanism (2) includes a limiting plate (21), the top of the limiting plate (21) is fixedly connected to the middle position of the bottom of the cover plate (11), the bottom of the limiting plate (21) is engaged with the inner wall of the power module (1), and a pull plate (22) is fixedly connected to the bottom of the limiting plate (21).

4. The novel packaging structure of a snap-on power module according to claim 3, characterized in that, The bottom of the limiting plate (21) protrudes to one side, and the bottom of the protruding part is beveled.

5. The novel packaging structure of a snap-on power module according to claim 3, characterized in that, The top of both the left and right sides of the power module (1) is provided with rectangular grooves, and the height of the rectangular grooves is greater than the thickness of the bottom protrusion of the limiting plate (21).

6. The novel packaging structure of a snap-on power module according to claim 1, characterized in that, The snap-fit ​​mechanism (3) includes a fixing block (31). The top of the fixing block (31) is fixedly connected to the left and right positions of the bottom of the cover plate (11). The outer wall of the fixing block (31) is inserted into the inner cavity of the top of the power module (1). The front and rear positions of the bottom of the fixing block (31) are fixedly connected to connecting plates (32). The bottom of the connecting plate (32) is rotatably connected to a rotating shaft (33). One end of the rotating shaft (33) is rotatably connected to the inner wall of the cover plate (11). The outer wall of the rotating shaft (33) is fixedly connected to a snap-fit ​​block (34) between the two connecting plates (32). The outer wall of the snap-fit ​​block (34) is snapped into the inner cavity of the top of the power module (1). The front and rear parts of the outer wall of the rotating shaft (33) are provided with torsion springs (35). One end of the torsion springs (35) is fixedly connected to the inner cavity of the top of the power module (1).

7. The novel packaging structure of a snap-on power module according to claim 6, characterized in that, Irregular slots are provided at the front and back positions of the top of the power module (1). The width of the top of the irregular slot is greater than the width of the bottom. The top of the irregular slot is adapted to the fixing block (31). The width of the bottom of the irregular slot is greater than the width of the snap-fit ​​block (34).

8. The novel packaging structure of a snap-on power module according to claim 6, characterized in that, The snap-fit ​​block (34) is L-shaped, and the bottom of the snap-fit ​​block (34) has rounded corners.

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