Crimping type power module assembling and positioning tool

Abstract

The utility model provides a crimping type power module assembling and positioning tool which comprises a limiting plate, a plurality of sets of limiting holes are formed in the positions, corresponding to installation screw holes of a pressing plate, of the limiting plate, installation screws penetrate through the limiting holes, the lower end of the limiting plate is fixedly connected with a plurality of sets of supporting columns, and the supporting columns are fixedly connected with the limiting plate. The lower ends of the supporting columns are used for being inserted into mounting holes of a heat dissipation substrate. The limiting plate is provided with a plurality of sets of positioning holes used for allowing electrodes to penetrate through. According to the utility model, the problems that the screw and the electrode are easy to displace and the assembly and the product yield are influenced when the connecting screw of the crimping type power module is tightened are solved.

Description

Technical Field

[0001] This utility model relates to the field of semiconductor power devices, and in particular to a press-fit power module assembly and positioning fixture. Background Technology

[0002] Power modules are used in rail transportation, industrial control, power grid transmission, and photovoltaic power generation. Existing power modules mainly include welded and press-fit types. Press-fit power modules achieve electrical connections between chips through surface contact, eliminating the need for leads. Press-fit power modules offer advantages such as high current capacity, low stray inductance, and fast switching speed. However, the connecting screws between the pressure block and the heat sink of a press-fit SCR power module require manual tightening with a hex wrench. Due to the large number of screws and assembly tolerances, tightening can easily cause screw and electrode displacement, resulting in uneven contact pressure, affecting product yield, and excessive electrode displacement can lead to failure to seal the module. Therefore, a novel assembly and positioning fixture for press-fit power modules is needed. Utility Model Content

[0003] The purpose of this invention is to provide a novel crimp-type power module assembly and positioning fixture, which solves the problem that screw and electrode displacement is easily caused when tightening the connecting screws of the crimp-type power module, affecting assembly and product yield.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A pressure-fit power module assembly and positioning fixture includes a limiting plate with several sets of limiting holes corresponding to the mounting screw holes of the pressure plate. These limiting holes allow mounting screws to pass through. Several sets of support columns are fixedly connected to the lower end of the limiting plate, with the lower ends of the support columns inserted into mounting holes of a heat sink substrate. The limiting plate also has several sets of positioning holes for electrodes to pass through.

[0006] Preferably, in conjunction with the above scheme, a limiting post is fixedly provided at the lower end of the support column, and the limiting post is used to be inserted into the mounting hole.

[0007] Preferably, in combination with the above scheme, the diameter of the limiting post is smaller than the diameter of the support post, and the diameter of the support post is larger than the diameter of the mounting hole.

[0008] Preferably, in conjunction with the above scheme, the support columns are provided in four sets, and are respectively provided with four sets of mounting holes at the four corners of the heat dissipation substrate.

[0009] Preferably, in conjunction with the above scheme, the diameter of the positioning hole is smaller than the outer diameter of the insulating sleeve on the pressure plate. When assembling the positioning fixture and the power module, the lower end of the limiting plate overlaps the upper end of the insulating sleeve.

[0010] Preferably, in conjunction with the above scheme, the positioning holes are provided in two sets at intervals on the limiting plate.

[0011] Preferably, in conjunction with the above scheme, the limiting holes are arranged in eight sets at intervals, and each set corresponds to one of the eight sets of mounting screw holes.

[0012] The beneficial effects of this utility model are as follows: This utility model provides a crimp-type power module assembly and positioning fixture, which ensures the correct positioning by setting limiting holes for limiting the mounting screws and positioning holes for positioning electrodes on the limiting plate.

[0013] The present invention will be described in more detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0014] Figure 1 This is a structural diagram of a crimp-type power module assembly and positioning fixture according to the present invention.

[0015] Figure 2 This is a structural diagram of a press-fit power module according to the present invention.

[0016] Figure 3 This is an assembly diagram of the positioning device and the press-fit power module of this utility model.

[0017] Among them, 1. Assembly and positioning fixture; 2. Power module; 11. Limiting plate; 12. Positioning hole; 13. Limiting hole; 14. Support column; 15. Limiting column; 21. Heat dissipation substrate; 22. Mounting hole; 23. Module shell; 24. Disc spring sheet; 25. Pressure plate; 26. Insulating sleeve; 261. Electrode through hole; 27. Electrode; 28. Mounting screw hole; 29. ​​Mounting screw. Detailed Implementation

[0018] like Figure 2 The diagram shows a press-fit power module, model MTC253. The lower end of the module has a copper heat sink 21 with four sets of mounting holes 22 at its four corners. The upper end of the heat sink 21 has a module housing 23, with a disc spring 24 and an electrode 27 on its upper end. During assembly, a pressure plate 25 is pressed against the upper end of the disc spring 24. The electrode 27 passes through the electrode through-hole 261 of the insulating sleeve 26 on the pressure plate 25 from bottom to top. Mounting screws 29 are then passed through mounting screw holes 28 and the module housing 23, and tightened onto the heat sink 21 to prevent the disc spring 24 and electrode 27 from loosening. Due to the large number of connecting screws 29 and their assembly tolerances, tightening can easily cause displacement of the connecting screws 29 and electrode 27, resulting in uneven pressure on the contact surface, which will affect product yield. Furthermore, excessive electrode displacement may lead to problems with sealing.

[0019] like Figure 1 and Figure 3 The diagram illustrates a press-fit power module assembly and positioning fixture. This fixture 1 includes a limiting plate 11. The limiting plate 11 has several sets of limiting holes 13 corresponding to the mounting screw holes 28 of the pressure plate 25. These limiting holes 13 allow mounting screws 29 to pass through. Several sets of support columns 14 are fixedly connected to the lower end of the limiting plate 11. The lower ends of these support columns 14 are inserted into the mounting holes 22 of the heat sink substrate 21. To simultaneously limit the insertion of the mounting screws 29 and also limit the position of the electrodes 27, further enhancing the accuracy of component assembly, the limiting plate 11 is provided with several sets of positioning holes 12 for the electrodes 23 to pass through.

[0020] To ensure the stability of the assembly positioning fixture 1, a limiting post 15 is fixedly provided at the lower end of the support column 14. The limiting post 15 is used to be inserted into the mounting hole 22.

[0021] In order to better insert the limiting post 15 into the mounting hole 22 and limit its movement, the diameter of the limiting post 15 is smaller than the diameter of the support post 14, and the diameter of the support post 14 is larger than the diameter of the mounting hole 22.

[0022] To ensure the stable positioning of the assembly positioning fixture 1, the support column 14 is provided in four sets, which are respectively provided with four sets of mounting holes 22 at the four corners of the heat dissipation substrate 21.

[0023] In order to enable the insulating sleeve 26 to support the limiting plate 11 and achieve more stable support, the diameter of the positioning hole 12 is smaller than the outer diameter of the insulating sleeve 26 on the pressure plate 25. When the positioning fixture 1 is assembled with the power module 2, the lower end of the limiting plate 11 overlaps the upper end of the insulating sleeve 26.

[0024] To better coordinate with the two sets of electrodes 27 on the positioning power module 2, the positioning holes 12 are provided in two sets at intervals on the limiting plate 11.

[0025] To better accommodate the eight sets of mounting screws 29 on the positioning power module 2, the limiting holes 13 are provided in eight sets at intervals, and each set corresponds to one of the eight sets of mounting screw holes 28.

[0026] When using this assembly positioning fixture 1 to assemble the power module 2, first align the positioning holes 12 with the two sets of electrodes 27, and place the positioning fixture 1 on the power module 2 from top to bottom. Then, insert the limiting post 15 into the mounting hole 22 of the heat sink substrate 21. At this time, the eight limiting holes 13 on the limiting plate 11 are aligned with the eight sets of mounting screw holes 28 on the pressure plate 25, thus completing the basic installation and positioning of the fixture. Finally, place the eight sets of connecting screws 29 in the limiting holes 13 in sequence, and use a hex wrench to screw the connecting screws 29 into the threaded holes on the heat sink substrate 21.

[0027] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "bottom", "inner", "outer", "one end", "one side", "both ends", "both sides", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or any direct application to other situations, fall within the protection scope of the present invention.

Claims

1. A crimp-type power module assembly and positioning fixture, characterized in that, The assembly positioning fixture (1) includes a limiting plate (11), on which a number of limiting holes (13) are provided at the positions corresponding to the mounting screw holes (28) of the pressure plate (25), and the limiting holes (13) are used to pass through the mounting screws (29); a number of support columns (14) are fixedly connected to the lower end of the limiting plate (11), and the lower end of the support columns (14) is used to insert into the mounting holes (22) of the heat dissipation substrate (21); a number of positioning holes (12) are provided on the limiting plate (11) for the electrodes (23) to pass through.

2. The crimp-type power module assembly and positioning fixture according to claim 1, characterized in that, The lower end of the support column (14) is fixedly provided with a limiting column (15), which is used to be inserted into the mounting hole (22).

3. The crimp-type power module assembly and positioning fixture according to claim 2, characterized in that, The diameter of the limiting post (15) is smaller than the diameter of the support post (14), and the diameter of the support post (14) is larger than the diameter of the mounting hole (22).

4. The crimp-type power module assembly and positioning fixture according to any one of claims 1-3, characterized in that, The support column (14) is provided in four sets, and is respectively provided with four sets of mounting holes (22) at the four corners of the heat dissipation substrate (21).

5. The crimp-type power module assembly and positioning fixture according to claim 1, characterized in that, The diameter of the positioning hole (12) is smaller than the outer diameter of the insulating sleeve (26) on the pressure plate (25). When the positioning fixture (1) is assembled with the power module (2), the lower end of the limiting plate (11) overlaps the upper end of the insulating sleeve (26).

6. The crimp-type power module assembly and positioning fixture according to claim 1, characterized in that, The positioning holes (12) are provided in two sets at intervals on the limiting plate (11).

7. The crimp-type power module assembly and positioning fixture according to claim 1, characterized in that, The limiting holes (13) are arranged in eight sets at intervals, and each set corresponds to one of the eight sets of mounting screw holes (28).

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