Assembly welding jig

Abstract

The utility model belongs to the technical field of electronic device welding assembly, specifically discloses a kind of assembly welding fixture.The assembly welding fixture provided by the utility model, welding machine is arranged welding avoidance hole and is welded on the solder pad of circuit board with IGBT component;Elastic pad has elasticity, cover plate is in abutment with IGBT component, cover plate and elastic pad cooperate for adjusting the height of IGBT component relative to circuit board, so that the flatness of multiple IGBT components is within the required range, and then each IGBT component on the assembled circuit board can be fully attached with radiator, IGBT component is fully cooled, elastic pad with elasticity can provide uniform compression force, compensate the height difference of IGBT component, so that the consistency of the height of multiple IGBT components from circuit board is also improved, and the probability of causing pin fracture of IGBT component is reduced.

Description

Technical Field

[0001] This utility model relates to the field of electronic device welding and assembly technology, and in particular to an assembly welding fixture. Background Technology

[0002] A photovoltaic (PV) inverter is an electrical device used in a photovoltaic (PV) power generation system, responsible for converting the direct current (DC) generated by PV modules into alternating current (AC). IGBTs are crucial components of a PV inverter. The circuit board of a PV inverter typically integrates multiple IGBTs, all located on the same side of the board. However, IGBTs have high power output and generate significant heat; therefore, a heat sink is used to dissipate heat from the IGBTs. When multiple IGBTs are in direct contact with the heat sink, they need to be on the same plane. If they are not on the same plane, the contact area between the IGBTs and the heat sink will be uneven, potentially resulting in insufficient heat dissipation for some IGBTs. Furthermore, if the IGBTs are not on the same plane, their height from the circuit board will also be inconsistent, potentially causing lead breakage and even explosion. In existing technologies, the height of IGBT components is usually adjusted manually during the welding process. However, it is difficult to ensure that multiple IGBT components are kept on the same plane. The process is cumbersome, inefficient, and the installation accuracy is uncontrollable. Utility Model Content

[0003] The purpose of this invention is to provide an assembly and welding fixture that improves the installation accuracy of multiple IGBT components, ensures that the flatness of multiple IGBT components is within the required range, and prevents the pins of the IGBT components from breaking.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] Assembly and soldering fixtures for mounting IGBT components onto solder pads on a circuit board, including:

[0006] A base plate, one side of which is used to fix the circuit board, and the base plate is provided with welding clearance holes, which are used to correspond to the solder pads of the circuit board fixed to one side of the base plate;

[0007] An elastic pad is provided, one end of which is used to fix the IGBT element, and the other end of which is used to abut against the circuit board, and the pins of the IGBT element are inserted into the pads of the circuit board.

[0008] A cover plate is used to abut against the IGBT element and fix the relative position of the IGBT element and the circuit board. The soldering clearance hole is used for a soldering machine to pass through to solder the pins of the IGBT element to the pads of the circuit board.

[0009] As an optional technical solution for the above-mentioned assembly and welding fixture, the cover plate is provided with a height limiting member along the circumferential edge on the side facing the IGBT element, and the height limiting member abuts against the base plate.

[0010] As an optional technical solution for the above-mentioned assembly and welding fixture, the cover plate is provided with an observation window, which is correspondingly set with the solder pads of the circuit board.

[0011] As an optional technical solution for the above-mentioned assembly and welding fixture, the assembly and welding fixture further includes a connector, which passes through the cover plate, the elastic pad and the circuit board and is connected to the base plate.

[0012] As an optional technical solution for the above-mentioned assembly and welding fixture, the assembly and welding fixture further includes an error-proof sleeve plate, which is disposed between the cover plate and the base plate. The error-proof sleeve plate is provided with a fitting opening for the IGBT element to pass through. The error-proof sleeve plate is provided with an identification piece, which is provided one-to-one with the IGBT element, and the type of the identification piece is provided in accordance with the model of the IGBT element.

[0013] As an optional technical solution for the above-mentioned assembly and welding fixture, the identification element includes any one of letters, colors, numbers, and shape blocks, and different letters, colors, numbers, or shape blocks correspond to different models of the IGBT element.

[0014] As an optional technical solution for the above-mentioned assembly and welding fixture, the cover plate is provided with a plug-in post on the side facing the IGBT element, and the anti-misalignment sleeve is provided with a plug-in hole, and the plug-in post is inserted into the plug-in hole.

[0015] As an optional technical solution for the above-mentioned assembly and welding fixture, a positioning pin is provided on one side of the base plate, a first positioning hole is provided on the anti-misalignment sleeve plate, and a second positioning hole is provided on the cover plate, with the positioning pin passing through the first positioning hole and the second positioning hole in sequence.

[0016] As an optional technical solution for the above-mentioned assembly and welding fixture, a mounting groove and a positioning component are provided on one side of the base plate. The mounting groove is used to accommodate the circuit board, and the positioning component is used to position the circuit board in the mounting groove.

[0017] As an optional technical solution for the above-mentioned assembly and welding fixture, the positioning component includes a plurality of positioning blocks, which are spaced apart circumferentially along the mounting groove. Each positioning block is provided with a positioning shaft, one end of which is rotatably connected to the base plate. One end of the positioning block is provided with a rotating groove, and the other end of the positioning shaft is inserted into the rotating groove. An elastic element is connected between the other end of the positioning shaft and the bottom of the rotating groove. The elastic element is configured to move the positioning block toward the base plate, so that the other end of the positioning block abuts against the upper surface of the circuit board placed in the mounting groove.

[0018] Beneficial effects:

[0019] The assembly and welding fixture provided by this utility model has a circuit board fixed to one side of a base plate. One end of an elastic pad is used to fix an IGBT element, and the other end of the elastic pad abuts against the circuit board, allowing the pins of the IGBT element to be inserted into the pads of the circuit board. A welding machine with welding clearance holes welds the IGBT element onto the pads of the circuit board. The elastic pad is elastic, and the cover plate abuts against the IGBT element. The cover plate and the elastic pad work together to adjust the height of the IGBT element relative to the circuit board, ensuring that the flatness of multiple IGBT elements is within the required range. This allows each IGBT element on the assembled circuit board to fully fit with the heat sink, ensuring sufficient heat dissipation. The elastic pad provides uniform clamping force, compensating for height differences of the IGBT elements and improving the consistency of the height of multiple IGBT elements from the circuit board, thus reducing the probability of IGBT element pin breakage. The assembly and welding fixture provided by this utility model replaces manual adjustment of the IGBT element height, simplifies the process, improves efficiency, and increases the installation accuracy of multiple IGBT elements. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the assembly and welding fixture provided in this embodiment of the utility model;

[0021] Figure 2 This is an exploded view of the assembly and welding fixture provided in this embodiment of the utility model;

[0022] Figure 3 This is a schematic diagram of the assembly structure of the IGBT element and the elastic pad provided in this embodiment of the utility model;

[0023] Figure 4 This is a side view of the assembly and welding fixture provided in this embodiment of the utility model;

[0024] Figure 5 This is a top view of the assembly and welding fixture provided in this embodiment of the utility model;

[0025] Figure 6 This is a schematic diagram of the structure of the base plate, IGBT components, and circuit board provided in this embodiment of the utility model;

[0026] Figure 7 This is a top view of the base plate, anti-misalignment sleeve, IGBT components, and circuit board provided in this embodiment of the utility model;

[0027] Figure 8 This is an isometric view of the base plate, anti-misalignment sleeve, IGBT components, and circuit board provided in this embodiment of the utility model;

[0028] Figure 9 This is a schematic diagram of the structure of the cover plate provided in an embodiment of this utility model.

[0029] In the picture:

[0030] 100. IGBT components; 200. Circuit board;

[0031] 1. Base plate; 2. Elastic pad; 3. Cover plate; 4. Connector; 5. Anti-misalignment sleeve;

[0032] 11. Welding clearance hole; 12. Locating pin; 13. Mounting groove; 14. Locating assembly; 141. Locating pressure block; 142. Locating stop block;

[0033] 31. Height limiting component; 32. Observation window; 33. Insertion post; 34. Second positioning hole;

[0034] 51. Socket; 52. Insertion hole; 53. First positioning hole. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0036] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this embodiment, the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0039] This embodiment provides an assembly and welding fixture for mounting IGBT components of a circuit board onto the pads of the circuit board, and for welding the IGBT components onto the pads of the circuit board by cooperating with a welding machine.

[0040] like Figures 1 to 3 As shown, the assembly and welding fixture includes a base plate 1, elastic pads 2, and a cover plate 3. One side of the base plate 1 is used to fix the circuit board 200. The base plate 1 is provided with welding clearance holes 11, which are configured to correspond to the pads of the circuit board 200 fixed to one side of the base plate 1. One end of the elastic pad 2 is used to fix the IGBT element 100, and the other end of the elastic pad 2 is used to abut against the circuit board 200, with the pins of the IGBT element 100 inserted into the pads of the circuit board 200. The cover plate 3 abuts against the IGBT element 100 and fixes the relative position of the IGBT element 100 and the circuit board 200. The welding clearance holes 11 are for the welding machine to pass through to weld the pins of the IGBT element 100 to the pads of the circuit board 200.

[0041] The circuit board 200 is fixed to one side of the base plate 1. One end of the elastic pad 2 fixes the IGBT element 100, and the other end of the elastic pad 2 abuts against the circuit board 200, allowing the pins of the IGBT element 100 to be inserted into the pads of the circuit board 200. A soldering machine, through soldering clearance holes 11, solders the IGBT element 100 onto the pads of the circuit board 200. The elastic pad 2 is elastic, and the cover plate 3 abuts against the IGBT element 100. The cover plate 3 and the elastic pad 2 cooperate to adjust the height of the IGBT element 100 relative to the circuit board 200, ensuring that the flatness of the multiple IGBT elements 100 is within the required range, thereby enabling… Each IGBT element 100 on the assembled circuit board 200 can fully fit against the heat sink, ensuring sufficient heat dissipation for the IGBT element 100. The elastic pad 2 provides uniform clamping force, compensating for the height difference of the IGBT elements 100 and improving the consistency of the height of multiple IGBT elements 100 from the circuit board 200, thus reducing the probability of pin breakage of the IGBT elements 100. The assembly and welding fixture provided in this embodiment replaces manual adjustment of the height of the IGBT elements 100, simplifying the process, improving efficiency, and increasing the installation accuracy of multiple IGBT elements 100.

[0042] Each elastic pad 2 may have one, two, or more IGBT elements 100 fixed on it, without specific limitation. For example, each elastic pad 2 is provided with two IGBT elements 100.

[0043] One end of the elastic pad 2 has a positioning groove, and one side wall of the positioning groove has an opening. The positioning groove is used to accommodate the package portion of the IGBT element 100, and the opening is used for the pins of the IGBT element 100 to pass through. The pins of the IGBT element 100 are inserted into the pads of the circuit board 200. The elastic pad 2 provides support and positioning for the package portion of the IGBT element 100. The cover plate 3 is placed on the surface of the IGBT element 100, making it less likely for the pins of the IGBT element 100 to break when adjusting its position. After the IGBT element 100 is soldered onto the circuit board 200, the elastic pad 2 is not removed; it is assembled together with the circuit board 200. The elastic pad 2 provides support for the package portion of the IGBT element 100, thereby improving the stability of the soldering between the IGBT element 100 and the circuit board 200. The specific structure of the elastic pad 2 is not specifically limited here.

[0044] In some embodiments, such as Figure 2 and Figure 4As shown, a height limiting member 31 is provided along the circumferential edge of the side of the cover plate 3 facing the IGBT element 100, and the height limiting member 31 abuts against the base plate 1. The height limiting member 31 restricts the distance between the cover plate 3 and the base plate 1, thereby limiting the adjustment of the height of the IGBT element 100 relative to the circuit board 200 by the cover plate 3, improving the accuracy of the IGBT element 100 mounting height, and ensuring that the height of multiple IGBT elements 100 is consistent, the cover plate 3 will not press against the IGBT element 100 towards the circuit board 200 without restriction. The height limiting member 31 can be a limiting post, with one end connected to the cover plate 3 and the other end abutting against the base plate 1, which has a simple structure.

[0045] In some embodiments, the assembly welding fixture further includes a connector 4, which passes through the cover plate 3, the elastic pad 2, and the circuit board 200 and is connected to the base plate 1. The connector 4 fixes the cover plate 3, the elastic pad 2, and the circuit board 200 to the base plate 1, forming a rigid connection with the base plate 1. The elastic pad 2 and the connector 4 form a locking engagement structure, so that the IGBT element 100 is kept at the same height.

[0046] Optionally, the connector 4 is a bolt, which passes through the cover plate 3, the elastic pad 2, and the circuit board 200 and is screwed to the base plate 1. For example, each elastic pad 2 is provided with a corresponding connector 4, and each elastic pad 2 is provided with two IGBT elements 100, with the connector 4 placed between the two IGBT elements 100.

[0047] In some embodiments, such as Figure 5 As shown, the cover plate 3 is provided with an observation window 32, which is set to correspond to the pads of the circuit board 200, so that the operator can easily observe the soldering status of the pins of the IGBT element 100 and the pads of the circuit board 200, thereby improving the convenience of the soldering operation and the controllability of the soldering quality.

[0048] In some embodiments, such as Figure 6 As shown, a mounting groove 13 and a positioning component 14 are provided on one side of the base plate 1. The mounting groove 13 is used to accommodate the circuit board 200, and the positioning component 14 is used to position the circuit board 200 within the mounting groove 13 to prevent the circuit board 200 from shifting relative to the mounting groove 13. Optionally, the depth of the mounting groove 13 is adapted to the thickness of the circuit board 200 to facilitate the placement and removal of the circuit board 200.

[0049] Optionally, the positioning component 14 includes a plurality of positioning blocks 141, which are spaced apart circumferentially along the mounting groove 13. Each positioning block 141 is provided with a positioning shaft. One end of the positioning block 141 is provided with a rotating groove. One end of the positioning shaft is rotatably connected to the base plate 1, and the other end of the positioning shaft is inserted into the rotating groove. An elastic element is connected between the other end of the positioning shaft and the bottom of the rotating groove. The elastic element is configured to move the positioning block 141 toward the base plate 1 so that the other end of the positioning block 141 presses against the upper surface of the circuit board 200 placed in the mounting groove 13, thereby preventing the positioning block 141 from damaging the circuit board 200 due to stress. Rotating the positioning block 141 can make the positioning block 141 press against the circuit board 200 in the mounting groove 13 or move the positioning block 141 away from the circuit board 200 in the mounting groove 13, making it convenient to place or remove the circuit board 200. Preferably, the elastic element is sleeved on the other end of the positioning shaft, and one end of the elastic element is fixedly connected to the positioning shaft, while the other end of the elastic element is fixedly connected to the bottom of the rotating groove, so as to prevent the elastic element from twisting and deforming when the positioning block 141 is rotated.

[0050] In another possible implementation, the positioning assembly 14 includes a plurality of positioning blocks disposed on opposite sides of the mounting groove 13. Each positioning block is slidably connected to the base plate 1, and an elastic element is connected between the positioning block and the base plate 1. The elastic element is configured to move the positioning block toward the center of the mounting groove 13, so that the positioning block presses against the upper surface of the circuit board 200 placed in the mounting groove 13, thereby fixing the circuit board 200 in the mounting groove 13.

[0051] Optionally, the positioning component 14 also includes a plurality of positioning blocks 142, which are spaced apart on the base plate 1 along the circumference of the mounting groove 13. One end of the positioning block 142 is flush with the groove wall of the mounting groove 13, ensuring that the circuit board 200 can be quickly and accurately installed into the mounting groove 13, thereby improving the installation efficiency, especially for the relatively thin circuit board 200.

[0052] In some embodiments, such as Figure 2 , Figure 7 , Figure 8 and Figure 9 As shown, the assembly welding fixture also includes a mis-assembly sleeve 5, which is disposed between the cover plate 3 and the base plate 1. The mis-assembly sleeve 5 is provided with a fitting opening 51 for IGBT element 100 to pass through. The mis-assembly sleeve 5 is provided with an identification piece, which is set one-to-one with the IGBT element 100, and the type of the identification piece is set to correspond to the model of the IGBT element 100, thereby reducing the misassembly rate of IGBT element 100.

[0053] Optionally, the identification element includes any one of letters, colors, numbers, and shape blocks. Different letters, colors, numbers, or shape blocks correspond to different models of IGBT elements 100, which facilitates the operator in placing the IGBT elements 100 and can effectively prevent incorrect placement of the IGBT elements 100.

[0054] Optionally, the cover plate 3 is provided with a plug post 33 on the side facing the IGBT element 100, and the anti-misalignment sleeve 5 is provided with a plug hole 52. The plug post 33 is inserted into the plug hole 52, which realizes the precise installation of the cover plate 3 and the fixation of the relative position of the cover plate 3 and the anti-misalignment sleeve 5.

[0055] Optionally, a positioning pin 12 is provided on one side of the base plate 1, a first positioning hole 53 is provided on the anti-misalignment sleeve 5, and a second positioning hole 34 is provided on the cover plate 3. The positioning pin 12 passes through the first positioning hole 53 and the second positioning hole 34 in sequence, thereby fixing the relative positions of the cover plate 3, the anti-misalignment sleeve 5 and the base plate 1, and enabling the cover plate 3, the anti-misalignment sleeve 5 and the base plate 1 to be quickly and accurately aligned during installation, thus improving assembly efficiency.

[0056] The specific steps for soldering the IGBT component 100 onto the pads of the circuit board 200 are as follows:

[0057] Step 1: Place the circuit board 200 in the mounting groove 13 on one side of the base plate 1, and press the positioning block 141 against the circuit board 200 in the mounting groove 13.

[0058] Step 2: Install the anti-misalignment sleeve 5 onto the base plate 1, and insert the positioning pin 12 through the first positioning hole 53 of the anti-misalignment sleeve 5.

[0059] Step 3: Install the IGBT element 100 on the elastic pad 2, and then insert the pins of the IGBT element 100 assembled on the elastic pad 2 onto the pads of the circuit board 200, and make the model of the IGBT element 100 correspond to the marking on the error prevention sleeve 5.

[0060] Step 4: Place the cover plate 3 on the IGBT element 100, and the positioning pin 12 passes through the second positioning hole 34 of the cover plate 3. The height limiting member 31 on the cover plate 3 abuts against the base plate 1.

[0061] Step 5: Connector 4 passes through cover plate 3, elastic pad 2 and circuit board 200 and connects with base plate 1 to fix IGBT element 100 on circuit board 200.

[0062] Step 6: Solder the IGBT element 100 onto the circuit board 200 through the soldering clearance hole 11. The soldering quality of the IGBT element 100 and the circuit board 200 can be observed through the observation window 32 on the cover plate 3.

[0063] Step 7: After welding is completed, remove connector 4, remove cover plate 3, anti-misalignment sleeve plate 5 and base plate 1, take out circuit board 200 with IGBT element 100 welded on, and place elastic pad 2 between IGBT element 100 and circuit board 200.

[0064] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An assembly and welding fixture for mounting IGBT elements (100) of a circuit board (200) onto the pads of the circuit board (200), characterized in that, include: A base plate (1) is provided on one side for fixing the circuit board (200). The base plate (1) is provided with a welding clearance hole (11) which is configured to correspond to the solder pads of the circuit board (200) fixed on one side of the base plate (1). An elastic pad (2) is provided, one end of which is used to fix the IGBT element (100), and the other end of which is used to abut against the circuit board (200), and the pins of the IGBT element (100) are inserted into the pads of the circuit board (200). The cover plate (3) is used to abut against the IGBT element (100) and fix the relative position of the IGBT element (100) and the circuit board (200). The welding clearance hole (11) is used for the welding machine to pass through to weld the pins of the IGBT element (100) to the pads of the circuit board (200).

2. The assembly and welding fixture according to claim 1, characterized in that, The cover plate (3) has a height limiting member (31) along its circumferential edge on the side facing the IGBT element (100), and the height limiting member (31) abuts against the base plate (1).

3. The assembly and welding fixture according to claim 1, characterized in that, The cover plate (3) is provided with an observation window (32), which is corresponding to the pads of the circuit board (200).

4. The assembly and welding fixture according to claim 1, characterized in that, The assembly welding fixture also includes a connector (4), which passes through the cover plate (3), the elastic pad (2) and the circuit board (200) and is connected to the base plate (1).

5. The assembly and welding fixture according to claim 1, characterized in that, The assembly welding fixture also includes a fault-prevention sleeve (5), which is disposed between the cover plate (3) and the base plate (1). The fault-prevention sleeve (5) is provided with a fitting opening (51) for the IGBT element (100) to pass through. The fault-prevention sleeve (5) is provided with an identification piece, which is provided in a one-to-one correspondence with the IGBT element (100), and the type of the identification piece corresponds to the model of the IGBT element (100).

6. The assembly and welding fixture according to claim 5, characterized in that, The identification element includes any one of letters, colors, numbers, and shape blocks, with different letters, colors, numbers, or shape blocks corresponding to different models of the IGBT element (100).

7. The assembly and welding fixture according to claim 5, characterized in that, The cover plate (3) has a plug post (33) on the side facing the IGBT element (100), and the anti-misoperation sleeve (5) has a plug hole (52), and the plug post (33) is inserted into the plug hole (52).

8. The assembly and welding fixture according to claim 5, characterized in that, The base plate (1) has a positioning pin (12) on one side, the anti-misalignment sleeve (5) has a first positioning hole (53), the cover plate (3) has a second positioning hole (34), and the positioning pin (12) passes through the first positioning hole (53) and the second positioning hole (34) in sequence.

9. The assembly and welding fixture according to claim 1, characterized in that, The base plate (1) has a mounting groove (13) and a positioning component (14) on one side. The mounting groove (13) is used to accommodate the circuit board (200), and the positioning component (14) is used to position the circuit board (200) in the mounting groove (13).

10. The assembly and welding fixture according to claim 9, characterized in that, The positioning component (14) includes a plurality of positioning blocks (141), which are spaced apart circumferentially along the mounting groove (13). Each positioning block (141) is provided with a positioning shaft. One end of the positioning shaft is rotatably connected to the base plate (1). One end of the positioning block (141) is provided with a rotating groove. The other end of the positioning shaft is inserted into the rotating groove. An elastic element is connected between the other end of the positioning shaft and the bottom of the rotating groove. The elastic element is configured to move the positioning block (141) toward the base plate (1) and press the other end of the positioning block (141) against the upper surface of the circuit board (200) placed in the mounting groove (13).

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