Power module magnetic core bonding positioning tool

Abstract

The utility model discloses a kind of power module magnetic core bonding positioning tool, belong to magnetic core positioning technical field, the utility model solves the problem of existing magnetic core bonding positioning inaccuracy, equipment structure complex.It includes fixed plate, upper steel mesh, lower steel mesh and printed board, printed board, upper steel mesh, lower steel mesh are detachably connected with fixed plate, fixed plate is between upper steel mesh and lower steel mesh, fixed plate is equipped with positioning cavity, printed board is located in positioning cavity, upper steel mesh is equipped with upper positioning hole, lower steel mesh is equipped with lower positioning hole, upper positioning hole, lower positioning hole and fixed hole are matched.The tool simplifies structure and reduces cost, improves positioning accuracy and guarantees electrical performance, multiple positioning cavities improve batch bonding efficiency, replace steel mesh and can be adapted to multi-specification production, suitable for power module batch production line, can improve production efficiency and product quality.

Description

Technical Field

[0001] This utility model belongs to the field of magnetic core positioning technology and relates to a power module magnetic core bonding and positioning tooling. Background Technology

[0002] As power modules trend towards miniaturization and high density, the bonding quality of the magnetic core (mostly made of ferrite, characterized by high brittleness and strict dimensional accuracy requirements) on the printed circuit board directly determines the module's electrical performance. If the alignment deviation between the upper and lower magnetic cores exceeds the allowable range, it will lead to inductance deviation, increased magnetic loss, and even abnormal module heating. The two current mainstream positioning methods have significant drawbacks: Defects of manual positioning: It relies on workers to adjust the position of the magnetic core with hand tools and judge the alignment entirely by experience. In actual operation, the upper and lower magnetic cores are prone to significant misalignment, resulting in a low pass rate of electrical performance of the product. In addition, the bonding of a single printed circuit board requires repeated adjustments and waiting for the glue to cure initially, which takes a long time. The single-shift production capacity is limited and it is difficult to meet the needs of batch orders. Mechanical positioning defects: Existing devices mostly adopt a structure of "multiple adjustable clamps + rigid positioning pins". The clamping force of the clamps needs to be adjusted one by one by bolts, and the gap between the positioning pin and the magnetic core hole needs to be repeatedly calibrated. Moreover, there is no buffer structure when the rigid clamp contacts the magnetic core, which can easily cause damage to the edges and corners of the magnetic core due to excessive clamping force or impact of the positioning pin. In addition, the complex adjustment parts are prone to wear and tear, requiring frequent maintenance and replacement, resulting in high maintenance costs. Furthermore, when changing production models, disassembly and adjustment are required, and the time to adapt to different specifications of magnetic cores is long, which cannot meet the needs of rapid production changeover. Neither of the above two methods can meet the production requirements of "high precision, high efficiency, low damage, and ease of operation", becoming a key bottleneck restricting the mass production of power modules. Utility Model Content

[0003] The purpose of this utility model is to provide a power module magnetic core bonding and positioning fixture to solve the technical problems of inaccurate positioning and complex equipment structure in the current process of bonding magnetic cores.

[0004] This utility model provides a power module magnetic core bonding and positioning fixture, including a fixing plate, an upper steel mesh, a lower steel mesh, and a printed circuit board. The printed circuit board, the upper steel mesh, and the lower steel mesh are all detachably connected to the fixing plate. The fixing plate is located between the upper steel mesh and the lower steel mesh. A positioning cavity is formed on the fixing plate, and the printed circuit board is located in the positioning cavity. An upper positioning hole is formed on the upper steel mesh, a lower positioning hole is formed on the lower steel mesh, and a fixing hole is formed on the printed circuit board. The upper positioning hole, the lower positioning hole, and the fixing hole are matched.

[0005] Furthermore, the fixing plate has multiple positioning cavities, the lower steel mesh has multiple lower positioning holes, and the upper steel mesh has multiple upper positioning holes, with each positioning cavity corresponding to a printed circuit board.

[0006] Furthermore, the fixed plate is provided with multiple positioning support platforms, and the printed circuit board is connected to the positioning cavity through the positioning support platforms.

[0007] Furthermore, the fixing plate is also provided with a clamping block for reinforcing the printed circuit board, and the clamping block matches the plurality of positioning support platforms.

[0008] Furthermore, the clamping block and the plurality of positioning support platforms are all located around the positioning cavity.

[0009] Furthermore, the upper steel mesh is provided with an upper magnetic core positioning rib for reinforcing the magnetic core, and the lower steel mesh is provided with a lower magnetic core positioning rib for reinforcing the magnetic core; the upper magnetic core positioning rib is disposed around the upper positioning hole, and the lower magnetic core positioning rib is disposed around the lower positioning hole.

[0010] Furthermore, the fixing plate is provided with multiple positioning posts, and the upper steel mesh and the lower steel mesh are connected to the fixing plate through the positioning posts.

[0011] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: 1. Simplified structure, reducing operation and maintenance costs: The core components of the tooling are only the fixed plate, the upper steel mesh, and the lower steel mesh, eliminating complex parts such as elastic clamping parts and fine-tuning bolts of traditional mechanical tooling. The positioning columns of the fixed plate enable quick bolt connection, which greatly shortens the assembly time. During maintenance, only the worn steel mesh needs to be replaced, which significantly reduces maintenance costs. In addition, the components are highly interchangeable, reducing the pressure of spare parts inventory. 2. Significantly improved positioning accuracy, ensuring stable electrical performance: The upper positioning holes of the upper steel mesh and the lower positioning holes of the lower steel mesh are all processed with high precision, resulting in minimal clearance between them and the fixing holes of the printed circuit board. Combined with the precise positioning of the fixed plate positioning cavity for the printed circuit board, the alignment deviation of the upper and lower magnetic cores can be stably controlled within the allowable range, greatly improving the product's electrical performance qualification rate and completely solving problems such as inductance fluctuations and increased magnetic losses caused by positioning deviations. 3. Doubled batch bonding efficiency, breaking through production capacity bottlenecks: The fixed plate is designed with multiple independent positioning cavities, which can clamp the corresponding number of printed circuit boards at the same time. The bonding time per batch is short. Compared with manual positioning, the single-shift production capacity is greatly improved, and the production efficiency is significantly increased, which fully meets the delivery cycle requirements of batch orders. 4. High versatility and adaptability to multiple specifications: The positioning cavity size can be designed as a series structure according to common printed circuit board specifications. By replacing the upper and lower steel mesh sheets of the corresponding size (without replacing the fixing plate), it can be adapted to the magnetic core bonding of different power modules. The changeover time is greatly shortened, and it can cover most common power module specifications, reducing the tooling investment cost for enterprises to produce multiple specifications. In summary, this tooling not only solves the problems of accuracy, efficiency, and damage in existing positioning methods, but also has the advantages of low cost and high adaptability. It can be directly applied to the mass production line of power modules, significantly improving production efficiency and product quality, and has great practical promotion value. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a schematic diagram of the upper steel mesh in Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the lower steel mesh in Embodiment 1 of this utility model. Figure 3 This is a schematic diagram of the structure of the fixing plate in Embodiment 1 of this utility model; Figure 4 This is a diagram showing the positioning of the printed circuit board on the fixing plate in Embodiment 1 of this utility model; Figure 5 This is the assembly drawing of the magnetic core bonding and positioning in Embodiment 1 of this utility model, where (a) is a side view and (b) is a front view.

[0013] In the diagram: 1. Tightening block; 2. Positioning post; 3. Fixing plate; 4. Printed circuit board; 5. Lower steel mesh; 6. Upper steel mesh; 7. Upper magnetic core; 8. Lower magnetic core; 9. Upper magnetic core positioning rib; 10. Lower magnetic core positioning rib; 11. Upper positioning hole; 12. Lower positioning hole; 13. Positioning cavity; 14. Positioning support platform; 15. Fixing hole. Detailed Implementation

[0014] 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. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0015] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0016] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0017] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0018] Example 1 Please refer to Figures 1-5 As shown: This embodiment provides a power module magnetic core bonding and positioning fixture. The connection relationship and structural details of each component are as follows: The fixture includes a fixed plate 3, an upper steel mesh 6, a lower steel mesh 5, and a printed circuit board 4. All four are detachably connected, and the fixed plate 3 is located between the upper steel mesh 6 and the lower steel mesh 5, forming a three-layer superimposed structure of "upper steel mesh 6 - fixed plate 3 - lower steel mesh 5".

[0019] Positioning posts 2 are evenly distributed along the edge of the fixing plate 3. The outer surface of the positioning posts 2 is threaded, and the positioning posts 2 penetrate the entire fixing plate 3. The upper steel mesh 6 and the lower steel mesh 5 each have through threaded holes corresponding to the positions of the positioning posts 2, and the size of the threaded holes is adapted to the positioning posts 2. During connection, the threaded holes of the upper steel mesh 6 are matched with the upper part of the positioning posts 2, and then screwed into the upper threaded part of the positioning posts 2 to fix the upper steel mesh 6 to the fixing plate 3. Similarly, the threaded holes of the lower steel mesh 5 are matched with the lower part of the positioning posts 2, and then screwed into the lower threaded part of the positioning posts 2 to fix the lower steel mesh 5 to the fixing plate 3.

[0020] The printed circuit board 4 has a fixing hole 15. The fixing hole 15 is connected to the upper positioning hole 11 of the upper steel mesh 6 and the lower positioning hole 12 of the lower steel mesh 5 to form a three-hole connected structure, thereby ensuring that the upper magnetic core 7 and the lower magnetic core 8 can pass through the fixing hole 15, the upper positioning hole 11 and the lower positioning hole 12, and achieve stable bonding through these three.

[0021] The fixing plate 3 has a positioning cavity 13 in the middle that is adapted to the shape of the printed circuit board 4. The printed circuit board 4 can be directly embedded into the positioning cavity 13, which serves as the initial positioning reference for the printed circuit board 4. The fixing plate 3 around the positioning cavity 13 is also provided with multiple positioning support platforms 14, and a clamping block 1 is provided corresponding to the positioning support platform 14. One end of the clamping block 1 is provided with an external thread, which can be screwed into the positioning cavity 13 to fix the printed circuit board 4, so as to further fix the printed circuit board 4 in conjunction with the positioning support platform 14. In this embodiment, the positioning cavity 13 is rectangular, and the positioning support platform 14 is disposed at three corners of the positioning cavity 13. A clamping block 1 is disposed at the fourth corner. When the printed circuit board 4 is placed into the positioning cavity 13, the clamping block 1 is screwed into the positioning support platform 14 until the other end of the clamping block 1 is tightly attached to the edge of the printed circuit board 4. Through the joint action of the clamping block 1 and the positioning support platform 14, the printed circuit board 4 is firmly fixed in the positioning cavity 13 to prevent displacement during the bonding process. Alternatively, the positioning cavity 13 can also be circular, with multiple positioning support platforms 14 and clamping blocks 1 arranged symmetrically around the positioning cavity 13 to ensure that the printed circuit board 4 can be securely fixed in the positioning cavity 13.

[0022] The upper steel mesh 6 has an upper positioning hole 11 in the middle that matches the magnetic core pins. The magnetic core pins can be inserted into the upper positioning hole 11 to achieve initial positioning of the magnetic core. Upper magnetic core positioning ribs 9 are integrally formed on the upper steel mesh 6 around the upper positioning hole 11. The upper magnetic core positioning ribs 9 are distributed around the upper positioning hole 11, and their inner walls are tightly fitted with the outer wall of the magnetic core, further restricting the horizontal movement of the magnetic core. The lower steel mesh 5 is completely symmetrical to the upper steel mesh 6. Its lower positioning hole 12 matches the magnetic core pins, and the lower magnetic core positioning ribs 10 around the lower positioning hole 12 are fitted with the outer wall of the magnetic core, ensuring precise alignment of the upper and lower magnetic cores 8.

[0023] The working principle of this embodiment is as follows: First, the printed circuit board 4 is embedded into the positioning cavity 13 of the fixed plate 3, so that the printed circuit board 4 is aligned with the positioning support platform 14 of the fixed plate 3. Then, the tightening block 1 is tightened and the printed circuit board 4 is pressed against it. Next, the lower steel mesh 5 is connected to the bottom of the fixed plate 3 through the lower part of the positioning post 2, so that the lower positioning hole 12 is aligned with the fixing hole 15 of the printed circuit board 4. The pins of the lower magnetic core 8 are inserted into the lower positioning hole 12, and the lower magnetic core positioning rib 10 fits against the outer wall of the lower magnetic core 8 to complete the positioning. Apply glue to the contact area between the magnetic core and the printed circuit board 4; then connect the upper steel mesh 6 to the top of the fixing plate 3 through the upper part of the positioning post 2, so that the upper positioning hole 11, the lower positioning hole 12 and the fixing hole 15 are coaxial. Insert the pins of the upper magnetic core 7 into the upper positioning hole 11, and the upper magnetic core positioning rib 9 fits against the outer wall of the upper magnetic core 7 to achieve positioning; after the glue has completely cured, remove the upper steel mesh 6 and the lower steel mesh 5 in sequence, and then loosen the top clamping block 1 to remove the printed circuit board 4 with the magnetic core bonded.

[0024] Example 2 This embodiment is based on the core structure of Embodiment 1 (fixed plate 3, upper steel mesh 6, lower steel mesh 5, printed circuit board 4) and the three-layer superimposed structure of "upper steel mesh 6-fixed plate 3-lower steel mesh 5". It only makes simple optimizations for damage prevention and clamping stability, without changing the core operating logic, as follows: 1. The magnetic core anti-scratch positioning structure has a layer of heat-resistant silicone strips pasted on the inner walls of the upper magnetic core positioning rib 9 of the upper steel mesh 6 and the lower magnetic core positioning rib 10 of the lower steel mesh 5. The silicone strips are directly attached to the inner walls of the positioning ribs to avoid rigid contact between the ferrite magnetic core and the steel positioning ribs, preventing damage to the edges and corners of the magnetic core due to assembly or clamping, while not affecting the fitting accuracy between the upper positioning hole 11, the lower positioning hole 12 and the magnetic core.

[0025] 2. The single-sided clamping block 1 of the positioning cavity 13 in Example 1 is replaced with symmetrically arranged clamping blocks 1 (located on opposite sides of the positioning cavity). The clamping blocks 1 are still connected to the fixing plate 3 by threads. When clamping the printed circuit board 4, the clamping blocks 1 are tightened simultaneously on both sides to fix the printed circuit board 4 from both directions. This is more stable than clamping from one side and can prevent the printed circuit board 4 from shifting during the bonding process. No additional operation steps are added.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model. Any modifications, equivalent substitutions and improvements made by those skilled in the art within the spirit and principles of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. A power module magnetic core bonding and positioning fixture, characterized in that: The device includes a fixed plate (3), an upper steel mesh (6), a lower steel mesh (5), and a printed circuit board (4). The printed circuit board (4), the upper steel mesh (6), and the lower steel mesh (5) are all detachably connected to the fixed plate (3). The fixed plate (3) is located between the upper steel mesh (6) and the lower steel mesh (5). The fixed plate (3) has a positioning cavity (13), and the printed circuit board (4) is located in the positioning cavity (13). The upper steel mesh (6) has an upper positioning hole (11), the lower steel mesh (5) has a lower positioning hole (12), and the printed circuit board (4) has a fixing hole (15). The upper positioning hole (11), the lower positioning hole (12), and the fixing hole (15) are matched.

2. The power module core bonding positioning fixture of claim 1, wherein: The fixing plate (3) has multiple positioning cavities (13), the lower steel mesh (5) has multiple lower positioning holes (12), and the upper steel mesh (6) has multiple upper positioning holes (11). The positioning cavities (13) correspond one-to-one with the printed circuit board (4).

3. The power module core bonding positioning fixture of claim 1, wherein: The fixed plate (3) is provided with multiple positioning support platforms (14), and the printed circuit board (4) is connected to the positioning cavity (13) through the positioning support platforms (14).

4. The power module magnetic core bonding and positioning fixture according to claim 3, characterized in that: The fixing plate (3) is also provided with a clamping block (1) for reinforcing the printed circuit board (4), and the clamping block (1) is matched with a plurality of positioning support platforms (14).

5. The power module core bonding positioning fixture of claim 4, wherein: The clamping block (1) and the plurality of positioning support platforms (14) are located around the positioning cavity (13).

6. The power module core bonding fixture of claim 1, wherein: The upper steel mesh (6) is provided with an upper magnetic core positioning rib (9) for reinforcing the magnetic core, and the lower steel mesh (5) is provided with a lower magnetic core positioning rib (10) for reinforcing the magnetic core; the upper magnetic core positioning rib (9) is located around the upper positioning hole (11), and the lower magnetic core positioning rib (10) is located around the lower positioning hole (12).

7. The power module core bonding fixture of claim 1, wherein: The fixing plate (3) is provided with multiple positioning posts (2), and the upper steel mesh (6) and the lower steel mesh (5) are connected to the fixing plate (3) through the positioning posts (2).

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