A power module press-fit sheet and a power module

Abstract

This utility model relates to power module installation technology and discloses a power module press-fit sheet and a power module, including a press-fit sheet body (1), which includes a positioning part (2) and a fixing part (3); the positioning part (2) includes a positioning piece (21), and the fixing part (3) includes a first fixing piece (31) and a second fixing piece (32), wherein the first fixing piece (31), the positioning piece (21) and the second positioning piece (21) are integrally formed. The power module press-fit sheet designed in this utility model ensures sufficient installation pressure between the heat sink and the module, reduces the thickness of the thermal grease layer, and to a certain extent enables the metal surface between the power module and the heat sink to have hard contact conditions, thereby greatly improving the heat dissipation performance of the module, and is simple in design and easy to install.

Description

Technical Field

[0001] This utility model relates to power module installation technology, and more particularly to a power module press-fit plate and a power module. Background Technology

[0002] With the development of third-generation semiconductors, the power density of power modules is constantly increasing, and users have higher requirements for the cost, ease of installation and application, and flexibility of power modules. For example, some surface-mount power module customers usually mount the heat sink as the bottom surface for heat dissipation. However, in order to achieve more flexible layout optimization, customers want the power module to be directly soldered to the PCB, while heat dissipation is achieved by using a heat sink mounted on the top surface of the module.

[0003] As with existing technology, US11355424 proposes a power module that can achieve top heat dissipation. While top heat dissipation modules bring convenience to customers, they also bring new challenges, namely, how to ensure that the heat sink can be effectively and reliably installed on the heat sink while minimizing contact thermal resistance.

[0004] During installation, these gaps often need to be filled by increasing the thickness of the thermal grease. Meanwhile, because the PCB can only withstand limited mounting pressure from the heatsink, the contact between top-mounted power modules and the heatsink is often soft; that is, the thermal contact between the module's heat dissipation surface and the heatsink is mainly through the thermal grease. However, thermal grease has poor thermal performance, and increasing its thickness means greater thermal resistance, thus affecting the overall performance of the model. Summary of the Invention

[0005] This invention addresses the problem in the prior art where, after a power module with top heat dissipation is soldered onto a PCB, the thickness of the solder layer between the pins and the PCB is difficult to control, leading to a contact gap between the top heat dissipation surface and the heat sink. The invention provides a pressure-fitting plate for the power module and a power module itself.

[0006] To solve the above-mentioned technical problems, the present invention provides a solution through the following technical method:

[0007] A press-fit sheet for a power module includes a press-fit sheet body, wherein the press-fit sheet body includes a positioning part and a fixing part; the positioning part includes a positioning piece, and the fixing part includes a first fixing piece and a second fixing piece, wherein the first fixing piece, the positioning piece and the second positioning piece are integrally formed.

[0008] By designing a one-piece molded pressure plate, the module is pressed onto the heatsink during installation. This reduces the installation force exerted by the heatsink on the PCB, preventing excessive PCB deformation. It also improves the fit precision of the mounting gap between the module and the heatsink. The pressure force of the pressure plate combined with the screws ensures more thorough thermal contact between the module and the heatsink, thereby enhancing the module's heat dissipation capacity.

[0009] Preferably, the press-fit sheet body is shaped like a "Z".

[0010] Preferably, the first fixing piece includes a first fixing horizontal piece and a first fixing vertical piece, which are integrally formed;

[0011] The second fixing piece includes a second fixing horizontal piece and a second fixing vertical piece, which are integrally formed.

[0012] Preferably, the angle between the first fixed vertical piece and the horizontal piece is a first angle; the angle between the second fixed vertical piece and the horizontal piece is a second angle.

[0013] Preferably, the range of the first included angle a and the second included angle b is between 45° and 75°; and the first included angle a and the second included angle b are equal.

[0014] Preferably, the first fixed horizontal plate is provided with a first fixing hole, and the second fixed horizontal plate is provided with a second fixing hole.

[0015] Preferably, the positioning piece has a positioning through hole in the middle.

[0016] Preferably, the thickness of the press-fit sheet body is between 2mm and 3mm.

[0017] To solve the above-mentioned technical problems, this utility model also provides a power module, including a power module body, on which a mounting groove is provided; the pressure plate is installed in the mounting groove.

[0018] This utility model, by adopting the above technical solution, has significant technical effects:

[0019] The power module press-fitting plate designed in this utility model ensures sufficient installation pressure between the heat sink and the module, reduces the thickness of the thermal grease layer, and to a certain extent enables the metal surfaces between the power module and the heat sink to have hard contact conditions, thereby significantly improving the heat dissipation performance of the module. Moreover, the design is simple and easy to install.

[0020] In this invention, during installation, a pressure plate is used to press the module onto the heat sink. This reduces the installation force exerted by the heat sink on the PCB board, preventing excessive PCB deformation. It also improves the fitting precision of the installation gap between the module and the heat sink. The pressure force of the pressure plate combined with the screws ensures more sufficient thermal contact between the module and the heat sink, thereby enhancing the module's heat dissipation capacity. Attached Figure Description

[0021] Figure 1 This is the main view of the press-fit sheet of this utility model.

[0022] Figure 2 This is a three-dimensional structural diagram of the press-fit sheet of this utility model.

[0023] Figure 3 This is a schematic diagram of the power module structure of this utility model.

[0024] Among them, 1—pressing plate body, 2—positioning part, 3—fixing part, 21—positioning plate, 22—positioning through hole, 31—first fixing plate, 32—second fixing plate, 33—first fixing horizontal plate, 34—first fixing vertical plate, 35—second fixing horizontal plate, 36—second fixing vertical plate, 37—first fixing hole, 38—second fixing hole. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0026] Example 1

[0027] A press-fit plate for a power module, Figure 1 The device includes a press-fit sheet body 1, which includes a positioning part 2 and a fixing part 213. The positioning part 2 includes a positioning piece, and the fixing part 213 includes a first fixing piece 31 and a second fixing piece 32. The first fixing piece 31, the positioning piece, and the second positioning piece are integrally formed.

[0028] By designing an integrated mounting plate, the module is pressed onto the heatsink during installation using a pressure plate. This reduces the mounting force exerted by the heatsink on the PCB, preventing excessive PCB deformation. It also improves the fit precision of the mounting gap between the module and the heatsink. The pressure of the pressure plate combined with the screws ensures more thorough thermal contact between the module and the heatsink, thereby enhancing the module's heat dissipation capacity.

[0029] The pressing sheet body 1 is U-shaped. A first fixing hole 37 is provided on the first fixing horizontal plate 33, and a second fixing hole 38 is provided on the second fixing horizontal plate 35. A positioning through hole 22 is provided in the middle of the positioning plate. The thickness of the pressing sheet body 1 is between 2mm and 3mm.

[0030] Example 2

[0031] A press-fit plate for a power module, Figure 1 The device includes a press-fit sheet body 1, which includes a positioning part 2 and a fixing part 213. The positioning part 2 includes a positioning piece, and the fixing part 213 includes a first fixing piece 31 and a second fixing piece 32. The first fixing piece 31, the positioning piece, and the second positioning piece are integrally formed.

[0032] By designing an integrated mounting plate, the module is pressed onto the heatsink during installation using a pressure plate. This reduces the installation force exerted by the heatsink on the PCB, preventing excessive PCB deformation. It also improves the fit precision of the mounting gap between the module and the heatsink. The pressure plate, combined with the screws, ensures more thorough thermal contact between the module and the heatsink, thereby enhancing the module's heat dissipation capacity. The pressure plate body 1 is U-shaped.

[0033] The first fixing plate 31 includes a first fixing horizontal plate 33 and a first fixing vertical plate 34, which are integrally formed. The second fixing plate 32 includes a second fixing horizontal plate 35 and a second fixing vertical plate 36, which are also integrally formed. The first fixing horizontal plate 33 has a first fixing hole 37, and the second fixing horizontal plate 35 has a second fixing hole 38. The positioning plate has a positioning through hole 22 in the middle. The pressing plate has first fixing holes 37 and second fixing holes 38 on both sides for screw fastening. The pressing plate is U-shaped and can be made of metal, such as aluminum, copper, iron, or their alloys. To reduce costs, it can also be made of plastic.

[0034] The angle between the first fixed vertical piece 34 and the horizontal piece is the first included angle a; the angle between the second fixed vertical piece 36 and the horizontal piece is the second included angle b.

[0035] The first included angle a and the second included angle b are between 45° and 75°; and the first included angle a and the second included angle b are equal. The thickness of the press-fit sheet body 1 is between 2 mm and 3 mm.

[0036] Example 3

[0037] A press-fit plate for a power module, Figure 1 The device includes a press-fit sheet body 1, which includes a positioning part 2 and a fixing part 213. The positioning part 2 includes a positioning piece, and the fixing part 213 includes a first fixing piece 31 and a second fixing piece 32. The first fixing piece 31, the positioning piece, and the second positioning piece are integrally formed.

[0038] By designing a one-piece molded mounting plate, the module is pressed onto the heatsink during installation. This reduces the mounting force exerted by the heatsink on the PCB, preventing excessive PCB deformation. It also improves the fit precision of the mounting gap between the module and the heatsink. The pressing force of the mounting plate combined with the screws ensures more thorough thermal contact between the module and the heatsink, thereby enhancing the module's heat dissipation capacity. The mounting plate body 1 is U-shaped.

[0039] The first fixing piece 31 includes a first fixing horizontal piece 33 and a first fixing vertical piece 34, which are integrally formed. The second fixing piece 32 includes a second fixing horizontal piece 35 and a second fixing vertical piece 36, which are integrally formed. The first fixing horizontal piece 33 is provided with a first fixing hole 37, and the second fixing horizontal piece 35 is provided with a second fixing hole 38. A positioning through hole 22 is provided in the middle of the positioning piece.

[0040] The angle between the first fixed vertical piece 34 and the horizontal piece is the first included angle a; the angle between the second fixed vertical piece 36 and the horizontal piece is the second included angle b.

[0041] The angle between the first included angle a and the second included angle b is 45°.

[0042] Example 4

[0043] Based on Example 3, the angle between the first included angle a and the second included angle b in this example is 60°.

[0044] The thickness of the press-fit sheet body 1 is 2mm.

[0045] Example 5

[0046] Based on Example 3, the angle between the first included angle a and the second included angle b in this example is 75°.

[0047] The thickness of the press-fit sheet body 1 is 3mm.

[0048] Example 6

[0049] Based on Example 3, the angle between the first included angle a and the second included angle b in this example is 60°. The thickness of the press-fit sheet body 1 is 1.5mm.

[0050] Example 7

[0051] Based on the above embodiments, Figure 3 In this embodiment, a power module is provided, including a power module body, on which a mounting slot is provided; the mounting plate body 1 is installed in the mounting slot.

Claims

1. A press pad of a power module comprising a press pad body (1), characterized in that, The press-fitting piece body (1) includes a positioning portion (2) and a fixing portion (3); the positioning portion (2) includes a positioning piece (21), and the fixing portion (3) includes a first fixing piece (31) and a second fixing piece (32). The first fixing piece (31), the positioning piece (21) and the second positioning piece (21) are integrally formed.

2. The press-fit sheet for a power module according to claim 1, characterized in that, The press-fitting piece body (1) is in a C shape.

3. The press-pack power module of claim 1, wherein, The first fixing piece (31) includes a first fixing horizontal piece (33) and a first fixing vertical piece (34), and the first fixing horizontal piece (33) and the first fixing vertical piece (34) are integrally formed; The second fixing piece (32) includes a second fixing horizontal piece (35) and a second fixing vertical piece (36), and the second fixing horizontal piece (35) and the second fixing vertical piece (36) are integrally formed.

4. A press pad for power modules according to claim 3, characterized in that The included angle between the first fixing vertical piece (34) and the horizontal piece is the first included angle a; the included angle between the second fixing vertical piece (36) and the horizontal piece is the second included angle b.

5. A power module press pad according to claim 4, wherein, The ranges of the first included angle a and the second included angle b are between 45° and 75°; and the first included angle a is equal to the second included angle b.

6. The press-pack power module of claim 3, wherein, A first fixing hole (37) is provided on the first fixing horizontal piece (33), and a second fixing hole (38) is provided on the second fixing horizontal piece (35).

7. The press-pack power module of claim 1, wherein, A positioning through hole (22) is provided in the middle of the positioning piece (21).

8. The press-pack power module of claim 1, wherein, The thickness of the press-fitting piece body (1) is between 2 mm and 3 mm.

9. A power module comprising a power module body, the power module body having a mounting groove formed therein; characterized by, The press-fitting piece body (1) according to any one of claims 1-8 is installed in the installation groove.

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