Power module PIN welding jig and power module PIN welding equipment

Abstract

The utility model provides a power module PIN welding jig, which belongs to the technical field of power module production and comprises a limiting part, a bearing part and a cover plate. A first bearing position is arranged on the limiting piece, and a first needle hole is formed in the edge of the first bearing position; the bearing part is provided with a second bearing position, the edge of the second bearing position is provided with a second pinhole, the second bearing position corresponds to the first bearing position, the second pinhole corresponds to the first pinhole, the axes of the second pinhole and the first pinhole coincide, and the cover plate can cover the bearing part and is used for pressing a substrate placed on the second bearing position. According to the jig, the perpendicularity of the PINs in the welding process is ensured through the first pinholes and the second pinholes which are accurately aligned, welding defects such as pseudo soldering and short circuit caused by deflection of the PINs are reduced, and the reliability of power module production can be improved.

Description

Technical Field

[0001] This utility model relates to the field of power module manufacturing technology, and in particular to a jig for soldering power module pins and a power module pin soldering device. Background Technology

[0002] Power modules are a crucial component of power electronics technology. They typically refer to the integration of multiple power electronic devices (such as transistors, diodes, MOSFETs, and IGBTs) into a single module to achieve efficient power conversion and control. Power modules play a critical role in various power systems. As a core component of electronic devices, the soldering quality of the pins during the power module manufacturing process directly affects the performance and reliability of the entire device. During power module manufacturing, the pins need to be precisely soldered onto the ceramic copper-clad substrate to ensure a good connection with external circuitry. However, the pin soldering process, especially the control of its perpendicularity, has always been a technical challenge in the industry.

[0003] Traditional power module pin soldering methods rely heavily on operator skill and experience, using manual methods or simple tooling. This approach is not only inefficient and ill-suited for large-scale production, but also struggles to guarantee soldering quality. Due to the lack of effective positioning and limiting mechanisms, pins are prone to misalignment during soldering, resulting in non-perpendicular pins after soldering. Insufficient pin perpendicularity leads to a series of problems. First, it affects the assembly accuracy of the power module with the housing or other components, causing assembly difficulties or unstable product performance. Second, pin misalignment can cause poor electrical connections, increasing the risk of circuit failure. Furthermore, inconsistent soldering quality increases product rework rates and production costs.

[0004] Therefore, it is necessary to improve the existing PIN soldering method of power modules to overcome the shortcomings of the existing technology. Utility Model Content

[0005] To overcome the problems existing in related technologies, one of the objectives of this utility model is to provide a fixture for soldering PIN pins of power modules. This fixture ensures the perpendicularity of the PIN pins during the soldering process by precisely aligning the first and second pin holes, reducing soldering defects caused by PIN pin misalignment, such as cold solder joints and short circuits, thereby improving the reliability of power module production.

[0006] A fixture for soldering pins of a power module, comprising:

[0007] A limiting member, wherein a first bearing position is provided on the limiting member, and a first pinhole is provided on the edge of the first bearing position;

[0008] A carrier component is provided with a second bearing position, and a second pinhole is provided on the edge of the second bearing position; wherein, the second bearing position corresponds to the first bearing position, and the second pinhole corresponds to the first pinhole and their axes coincide;

[0009] A cover plate, which can be placed on the support member, is used to press the substrate placed on the second support position.

[0010] In a preferred embodiment of this invention, multiple first pinholes are provided on the edge of the first bearing position, and multiple second pinholes are provided on the edge of the second bearing position.

[0011] In a preferred embodiment of this invention, one side of the bearing member is connected to the limiting member;

[0012] The support member has a mounting post on one side, and the limiting member has a slot that is adapted to the mounting post.

[0013] In a preferred embodiment of this invention, the mounting post is provided with a post hole, and the limiting member is provided with a bolt, which passes through the slot and is threadedly connected to the post hole.

[0014] In a preferred embodiment of this invention, a limiting groove is provided at the edge of the second bearing position, and the limiting groove is recessed inward from the surface of the bearing member.

[0015] In a preferred embodiment of this utility model, multiple first bearing positions are provided on the limiting member; multiple second bearing positions are provided on the bearing member.

[0016] In a preferred embodiment of this invention, a connecting shaft is provided on the cover plate, and the connecting shaft is hinged to the bearing member.

[0017] In a preferred embodiment of this invention, a first magnetic material is provided on the side of the cover plate away from the connecting shaft, and a second magnetic material is provided on the support member, wherein the first magnetic material and the second magnetic material have opposite magnetic properties.

[0018] The second objective of this utility model is to provide a power module PIN pin soldering device, including a worktable, a flipping mechanism on the worktable, and a fixture for power module PIN pin soldering as described above on the flipping mechanism.

[0019] The beneficial effects of this utility model are as follows:

[0020] This utility model provides a PIN soldering fixture for power modules, comprising a limiting member, a carrier member, and a cover plate. The limiting member has a first carrier position with a first pin hole at its edge; the carrier member has a second carrier position with a second pin hole at its edge. The second carrier position corresponds to the first carrier position, and the second pin hole corresponds to the first pin hole and their axes coincide. The cover plate can be placed on the carrier member to press the substrate placed on the second carrier position. During use, the first and second carrier positions can be used to place the copper-clad substrate of the power chip, while the first and second pin holes are used to place the PIN pins. Precise alignment of the first and second pin holes ensures the perpendicularity of the PIN pins during soldering. During soldering, the PIN pin is placed in the second pin hole and inserted into the first pin hole. Then, the copper-clad substrate is placed on the second carrier position and pressed down by the cover plate. The entire fixture is then flipped, allowing the PIN pin's base to fall vertically onto the solder paste surface of the copper-clad substrate under gravity. The entire carrier is then placed into the reflow soldering equipment to complete the soldering. Throughout the soldering process, the first and second pinholes limit the pins, reducing soldering defects caused by pin misalignment, such as cold solder joints and short circuits. This improves the reliability of power module production and enhances the product's durability and long-term stability.

[0021] This application also provides a power module PIN soldering device, which includes a worktable with a flipping mechanism and a power module PIN soldering fixture as described above. This device enables automated soldering of PINs to copper-clad laminates, and the power module PIN soldering fixture ensures the perpendicularity of the PINs during soldering, thereby improving soldering accuracy and reliability, reducing soldering defects and rework rates, and lowering production costs. Attached Figure Description

[0022] Figure 1 This is an exploded view of the power module PIN pin soldering fixture provided in this embodiment of the utility model, excluding the pressure cap;

[0023] Figure 2 This is a schematic diagram of the power module PIN pin welding fixture provided in this embodiment of the present invention, excluding the pressure cap;

[0024] Figure 3 This is a schematic diagram of the mechanism of the power module PIN pin welding fixture provided in this embodiment of the utility model, including the pressure cap;

[0025] Figure 4 This is a schematic diagram of the power module PIN soldering device provided in the embodiments of this utility model.

[0026] Figure label:

[0027] 1. Limiting component; 11. First bearing position; 12. First pinhole; 2. Bearing component; 21. Second bearing position; 22. Second pinhole; 23. Mounting post; 24. Second magnetic material; 3. PIN pin; 4. Copper-clad substrate; 5. Cover plate; 51. Connecting shaft; 52. First magnetic material; 100. Worktable; 110. Flipping mechanism. Detailed Implementation

[0028] Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0029] Power modules are a crucial component of power electronics technology. They typically refer to the integration of multiple power electronic devices (such as transistors, diodes, MOSFETs, and IGBTs) into a single module to achieve efficient power conversion and control. Power modules play a critical role in various power systems. As a core component of electronic devices, the soldering quality of the pins during the power module manufacturing process directly affects the performance and reliability of the entire device. During power module manufacturing, the pins need to be precisely soldered onto the ceramic copper-clad substrate to ensure a good connection with external circuitry. However, the pin soldering process, especially the control of its perpendicularity, has always been a technical challenge in the industry.

[0030] Traditional power module pin soldering methods rely heavily on operator skill and experience, using manual methods or simple tooling. This approach is not only inefficient and ill-suited for large-scale production, but also struggles to guarantee soldering quality. Due to the lack of effective positioning and limiting mechanisms, pins are prone to misalignment during soldering, resulting in non-perpendicular pins after soldering. Insufficient pin perpendicularity leads to a series of problems. First, it affects the assembly accuracy of the power module with the housing or other components, causing assembly difficulties or unstable product performance. Second, pin misalignment can cause poor electrical connections, increasing the risk of circuit failure. Furthermore, inconsistent soldering quality increases product rework rates and production costs.

[0031] Based on this, this application provides a fixture for soldering PIN pins of a power module.

[0032] Example 1

[0033] like Figures 1-3 As shown in the figure, this embodiment provides a power module PIN pin soldering fixture, which includes a limiting member 1, a carrier member 2, and a cover plate 5. The limiting member 1 is provided with a first carrier position 11, and the edge of the first carrier position 11 is provided with a first pin hole 12; the carrier member 2 is provided with a second carrier position 21, and the edge of the second carrier position 21 is provided with a second pin hole 22, wherein the second carrier position 21 corresponds to the first carrier position 11, and the second pin hole 22 corresponds to the first pin hole 12 and their axes coincide. The cover plate 5 can be covered on the carrier member 2 to press the substrate placed on the second carrier position 21.

[0034] Specifically, multiple first pinholes 12 are provided on the edge of the first bearing position 11, and multiple second pinholes 22 are provided on the edge of the second bearing position 21.

[0035] During use, the first support position 11 and the second support position 21 of this fixture can be used to place the copper-clad substrate 4 for the power chip, while the first pin hole 12 and the second pin hole 22 are used to place the PIN pins 3. By precisely aligning (aligning axes) the first pin hole 12 and the second pin hole 22, the perpendicularity of the PIN pins 3 during the soldering process is ensured. During soldering, the PIN pins 3 are placed in the second pin hole 22, with the PIN pins 3 extending into the first pin hole 12. Then, the copper-clad substrate 4 is placed on the second support position and pressed down using the cover plate 5. The entire fixture is then flipped over, so that the base of the PIN pins 3 falls vertically onto the solder paste surface of the copper-clad substrate 4 under the action of gravity. The entire fixture is then placed in a reflow soldering machine to complete the soldering. Throughout the soldering process, because the first pin hole 12 and the second pin hole 22 limit the movement of the PIN pins 3, soldering defects caused by the misalignment of the PIN pins 3, such as cold solder joints and short circuits, can be reduced, thereby improving the reliability of power module production and enhancing the durability and long-term stability of the product.

[0036] In practical applications, the PIN pin 3 of this application is a T-type PIN pin 3. Before the copper-clad substrate 4 is placed in the second placement position, solder paste needs to be applied to the copper-clad substrate 4. After the base of the T-type PIN pin 3 comes into contact with the solder paste, the entire fixture is then placed into the reflow soldering equipment to complete the soldering.

[0037] It should be noted that, in order to ensure the verticality of the PIN pin 3 after soldering, after the PIN pin 3 is inserted into the first pin hole 12 and the second pin hole 22, the distance between the side wall of the PIN pin 3 and the inner wall of the pin hole should be less than 0.05mm.

[0038] In one specific embodiment, one side of the carrier 2 is connected to the limiting member 1;

[0039] The support member 2 is provided with a mounting post 23 on one side, and the limiting member 1 is provided with a slot, which is adapted to the mounting post 23.

[0040] The slot is adapted to the mounting post 23. This design allows the carrier 2 to be securely connected to the limiting member 1, while facilitating installation and disassembly. Moreover, the slot and mounting post 23 are adapted to each other and aligned with the positioning of the first pin hole 12 and the second pin hole 22, which helps to ensure the perpendicularity of the PIN pin 3 after soldering.

[0041] Furthermore, the mounting post 23 is provided with a post hole, and the limiting member 1 is provided with a bolt, which passes through the slot and is threadedly connected to the post hole.

[0042] The bolts pass through the slots and the post holes and are fixed by threaded connections. This design provides a simple and effective fixing method, ensuring the stability of the fixture during the welding process.

[0043] The assembly method of the bearing component 2 and the limiting component 1 is as follows: Align the mounting post 23 of the bearing component 2 with the slot on the limiting component 1, and then insert the mounting post 23 into the slot to connect the two. Pass the bolt on the limiting component 1 through the slot and align it with the post hole on the mounting post 23. Screw the bolt into the post hole to fix the bearing component 2 and the limiting component 1 through threaded connection, ensuring that the two are tightly connected.

[0044] Furthermore, a limiting groove is provided at the edge of the second bearing position 21, and the limiting groove is recessed inward from the surface of the bearing member 2.

[0045] The limiting groove design provides additional positioning support when placing the copper-clad substrate 4, ensuring the stability of the substrate during the welding process and preventing it from shifting during welding.

[0046] Furthermore, the first bearing position 11 is provided on the limiting member 1 in multiple ways; the second bearing position 21 is provided on the bearing member 2 in multiple ways.

[0047] Multiple first bearing positions 11 are provided on the limiting member 1, and multiple second bearing positions 21 are also provided on the bearing member 2. This design allows multiple power modules to be processed simultaneously, improving production efficiency and accommodating power modules of different specifications and sizes.

[0048] In one embodiment, a connecting shaft 51 is provided on the cover plate 5, and the connecting shaft 51 is hinged to the support member 2. Furthermore, a first magnetic material 52 is provided on the side of the cover plate 5 away from the connecting shaft 51, and a second magnetic material 24 is provided on the support member 2, wherein the first magnetic material 52 and the second magnetic material 24 have opposite magnetic properties.

[0049] A connecting shaft 51 is provided on the cover plate 5, and the connecting shaft 51 is hinged to the support member 2. This design allows the cover plate 5 to be easily flipped open or closed, facilitating quick placement and removal of the substrate by the operator. A first magnetic material 52 is provided on the side of the cover plate 5 away from the connecting shaft 51, and a second magnetic material 24 is provided on the support member 2. The first magnetic material 52 and the second magnetic material 24 have opposite magnetic properties. This design ensures that the cover plate 5 can be firmly attached to the support member 2 when closed, preventing accidental opening during the welding process, while also allowing the operator to easily open the cover plate 5 when needed.

[0050] Example 2

[0051] like Figure 1-Figure 4 As shown, this embodiment provides a power module PIN pin 3 welding device, including a worktable 100, a flipping mechanism 110 is provided on the worktable 100, and a power module PIN pin welding fixture as described in Embodiment 1 is provided on the flipping mechanism 110.

[0052] The worktable 100 is the foundation of the welding equipment, used to support and secure the components required throughout the welding process. The tilting mechanism 110 is a mechanical device mounted on the worktable 100, used to tilt the welding components during the welding process. This mechanism can be manual or automatic, and can precisely control the tilting angle and speed to ensure the welding components are correctly positioned at different welding stages.

[0053] The equipment is used as follows: Place the power module PIN soldering fixture on the flipping mechanism 110 on the worktable 100, ensuring the fixture is stable and correctly positioned. Place the PIN pin 3 on the second pin hole 22 and the first pin hole 12, and place the copper-clad substrate 4 on the second support position 21 of the support member 2 of the fixture, with the PIN pin 3 passing through the second pin hole 22. Cover with the cover plate 5, pressing the substrate placed on the support member 2 to ensure a tight bond between the PIN pin 3 and the substrate during the soldering process.

[0054] The flipping mechanism 110 is activated, rotating the PIN 3 soldering fixture 180 degrees. In this position, the PIN 3 is in contact with the soldering material (such as solder paste), ready for soldering. The soldering process can be reflow soldering or other soldering techniques to ensure that the PIN 3 is firmly soldered to the power module substrate. After soldering is completed, the flipping mechanism 110 flips the soldered power module back to its original position for final quality inspection and unloading.

[0055] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0056] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0057] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A fixture for soldering PIN pins of a power module, characterized in that, include: A limiting member (1) is provided with a first bearing position (11), and a first pinhole (12) is provided on the edge of the first bearing position (11); The carrier (2) is provided with a second bearing position (21), and a second pin hole (22) is provided on the edge of the second bearing position (21); wherein the second bearing position (21) corresponds to the first bearing position (11), and the second pin hole (22) corresponds to the first pin hole (12) and their axes coincide. Cover plate (5), which can cover the support member (2) and is used to press the substrate placed on the second support position (21).

2. The fixture for soldering power module PIN pins according to claim 1, characterized in that: Multiple first pinholes (12) are provided on the edge of the first bearing position (11), and multiple second pinholes (22) are provided on the edge of the second bearing position (21).

3. The fixture for soldering power module PIN pins according to claim 2, characterized in that: One side of the support member (2) is connected to the limiting member (1); The support member (2) has a mounting post (23) on one side, and the limiting member (1) has a slot that is adapted to the mounting post (23).

4. The fixture for soldering power module PIN pins according to claim 3, characterized in that: The mounting post (23) is provided with a post hole, and the limiting member (1) is provided with a bolt, which passes through the slot and is threadedly connected to the post hole.

5. The power module PIN soldering fixture according to any one of claims 1-4, characterized in that: The edge of the second bearing position (21) is provided with a limiting groove, which is recessed inward from the surface of the bearing member (2).

6. The power module PIN soldering fixture according to any one of claims 1-4, characterized in that: Multiple first bearing positions (11) are provided on the limiting member (1); multiple second bearing positions (21) are provided on the bearing member (2).

7. The fixture for soldering power module PIN pins according to claim 1, characterized in that: A connecting shaft (51) is provided on the cover plate (5), and the connecting shaft (51) is hinged to the bearing member (2).

8. The fixture for soldering power module PIN pins according to claim 7, characterized in that: A first magnetic material (52) is provided on the side of the cover plate (5) away from the connecting shaft (51), and a second magnetic material (24) is provided on the support member (2). The first magnetic material (52) and the second magnetic material (24) have opposite magnetic properties.

9. A power module PIN soldering device, comprising a worktable (100), characterized in that: The workbench (100) is provided with a flipping mechanism (110), and the flipping mechanism (110) is provided with a power module PIN pin soldering fixture as described in any one of claims 1-8.

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