Novel IGBT module pin and PCB connecting device

Abstract

The utility model relates to a novel IGBT module pin and PCB connecting device, each connecting device comprises a strip-shaped hollow shell, a cylindrical claw needle head and an elastic support structure, the claw needle head and the elastic support structure are arranged in the shell, the middle position of the top surface of the shell is provided with a through hole, the claw needle head is arranged in the through hole, the claw needle head is partially inserted into the shell, and the elastic support structure is arranged in the shell. The claw needle is inserted into the shell, the part of the claw needle is exposed out of the shell, the exposed part of the head of the claw needle penetrates through a corresponding hole in a PCB bonding pad, then the top surface of the shell and the PCB bonding pad are welded, a cylindrical limiting base is arranged at the bottom of the head of the claw needle inserted into the shell, and an elastic supporting structure is installed on the outer side of the limiting base. One end, close to the limiting base, of the elastic supporting structure is used for supporting and rebounding the limiting base and the claw needle head, and the other end, after pressing the claw needle head, of the elastic supporting structure extends out of the shell and is embedded in a pin corresponding to the IGBT module. The utility model has the advantages of simple and reasonable structure, practicability, convenience and the like.

Description

Technical Field

[0001] This utility model belongs to the field of electronic device technology and relates to a novel connection device between IGBT module pins and PCB board. Background Technology

[0002] IGBT is short for Insulated Gate Bipolar Transistor, a three-terminal semiconductor switching device that can be used for efficient and fast switching in a variety of electronic devices.

[0003] Traditionally, power module pins are soldered to the control circuit board. For multi-pin modules and PCBs using multiple modules, module disassembly is difficult when repair is needed, and other components on the surface can obstruct replacement, making the repair process time-consuming, labor-intensive, and prone to irreversible damage, resulting in low overall PCBA repair yield and significant economic losses for companies. Currently, an alternative solution to soldering is Press-Fit. Press-Fit connectors, commonly known as "fisheye terminals," can be repeatedly assembled and disassembled within a certain number of cycles. However, in practical use, PCB design or exceeding a certain number of disassemblies can make module replacement difficult, hindering repair.

[0004] To address this issue, a novel connection device between the IGBT module pins and the PCB board was designed to overcome the aforementioned problems. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a new type of IGBT module pin connection device to PCB board that is reasonably structured, easy to install and disassemble, and simple to maintain.

[0006] This utility model is achieved through the following technical solution: A novel connection device for IGBT module pins and a PCB board, comprising a connection device embedded in each pin of the IGBT module, and each connection device comprising a long, hollow shell and a cylindrical claw pin head and an elastic support structure disposed within the shell. A through hole is provided in the middle of the top surface of the shell, and a claw pin head is installed in the through hole. The claw pin head is partially inserted into the shell, with the exposed portion protruding from the shell. The exposed portion of the claw pin head passes through a corresponding opening on the PCB board pad, thus connecting the top surface of the shell to the PCB board pad. The welding process involves inserting a claw needle into the housing. A cylindrical limiting base with a diameter larger than the claw needle is located at the bottom of the needle. An elastic support structure is installed on the outside of the limiting base inside the housing. One end of this elastic support structure, near the limiting base, provides support and rebound for both the limiting base and the claw needle. The other end of the elastic support structure extends out of the housing after the claw needle is pressed, embedding itself into the corresponding pin of the IGBT module. After installation, releasing the claw needle causes the elastic support structure to retract inwards into the housing and lock the pin, thus securing the pin to the connecting device.

[0007] Preferably, the elastic support structure consists of a fixing ring and multiple elastic arc-shaped clamping pins. The fixing ring is horizontally fixed to the inner wall of the housing and is higher than the limiting base. Multiple arc-shaped clamping pins are evenly arranged directly below the fixing ring, forming a frame structure that is wider at the top and narrower at the bottom with the fixing ring. When no force is applied, the bottom height of the arc-shaped clamping pins is flush with the bottom height of the housing. Pushing the claw pin head downwards causes the limiting base at the bottom of the claw pin head to move downwards and insert into the frame structure. The upper part of each arc-shaped clamping pin engages to limit the movement, while the lower part of the arc-shaped clamping pin opens and partially protrudes from the housing, facilitating embedding into the corresponding pin of the IGBT module. After installation, the claw pin head is released, and the lower part of the arc-shaped clamping pin retracts inwards to lock the pin. The upper part of the arc-shaped clamping pin retracts inwards to spring back and reset the claw pin head.

[0008] Preferably, the upper part of the long, hollow shell is a semi-circular structure, and the lower part is a cylindrical structure with the same diameter as the semi-circular structure. The upper part of the semi-circular structure and the lower part of the cylindrical structure together form an inverted U-shaped shell.

[0009] Preferably, the upper outer surface of the housing is provided with a welding slot, and a corresponding pad opening matching the welding slot is provided on the PCB board pad, and the diameter of the pad opening is smaller than the diameter of the lower part of the housing, so as to ensure that the housing size is compatible with the pad opening and thus facilitates installation.

[0010] Preferably, the welding slot is a multi-ring welding slot pattern set on the upper outer surface of the housing, with the corresponding height dimension marked on each ring of the slot pattern, which facilitates the installation of PCB boards of corresponding thickness, and allows for the selection of claw pins of matching size according to the PCB board of corresponding thickness, avoiding improper assembly that may affect the subsequent use of clamps to press and disassemble the module.

[0011] Preferably, the housing is made of alloy material and is plated with gold or silver to increase solderability.

[0012] The beneficial effects of this utility model are as follows:

[0013] The novel IGBT module pin connection device designed in this invention allows for repeated assembly and disassembly without limitation on the number of times it can be disassembled, improving the maintainability and flexibility of the product. It effectively realizes the application of multi-module parallel connection technology of IGBT modules in actual production. At the same time, when maintenance and replacement are required, the IGBT module can be directly pressed out using a disassembly jig, and a new module can be pressed in, thereby solving the maintenance problem of IGBT modules and improving the consistency of module crimping. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the internal structure of this utility model.

[0015] Figure 2 This is a top view of the present invention.

[0016] Figure 3 This is a bottom view of the present invention.

[0017] Figure 4 This is a perspective view of the present invention.

[0018] Figure 5 This is a schematic diagram of the assembly structure of this utility model. Detailed Implementation

[0019] To enable those skilled in the art to more clearly understand the purpose, technical solution and advantages of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "horizontal", and "vertical" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] The present invention will now be described in detail with reference to the accompanying drawings: Figure 1-3As shown, a novel connection device for connecting IGBT module pins to a PCB board includes a connection device embedded in each pin 12 of the IGBT module. Each connection device includes a long, hollow housing 1, a cylindrical claw pin head 2 disposed within the housing 1, and an elastic support structure. A through hole 3 is provided in the middle of the top surface of the housing 1, and the claw pin head 2 is installed in the through hole 3. Part of the claw pin head 2 is inserted into the housing, while the other part is exposed outside the housing 1. The exposed part of the claw pin head 2 passes through the corresponding opening on the PCB board pad 4, and then the top surface of the housing is soldered to the PCB board pad 4. The claw pin head inserted into the housing 1... The bottom of the needle head 2 is provided with a cylindrical limiting base 5 with a diameter larger than that of the claw needle head 2. An elastic support structure is installed on the outside of the limiting base 5 inside the housing 1. One end of the elastic support structure near the limiting base 5 is used to support and rebound the limiting base 5 and the claw needle head 2. The other end of the elastic support structure extends out of the housing 1 after the claw needle head 2 is pressed and is embedded in the corresponding pin 12 of the IGBT module. After the claw needle head 2 is released, the elastic support structure retracts inward and extends into the housing 1 to lock the pin 12, thereby realizing the installation and fixation between the pin 12 and the connecting device.

[0022] like Figure 4 As shown, the elastic support structure consists of a fixing ring 6 and multiple elastic arc-shaped clamping pins 7. The fixing ring 6 is horizontally fixed to the inner wall of the housing 1 and its height is higher than that of the limiting base. Multiple arc-shaped clamping pins 7 are evenly arranged directly below the fixing ring 6, forming a frame structure that is wider at the top and narrower at the bottom with the fixing ring 6. When not under force, the bottom height of the arc-shaped clamping pins 7 is flush with the bottom height of the housing 1. When the claw needle head 2 is pushed downward, its claw needle head... The bottom limiting base 5 moves downward and is inserted into the frame structure. The upper part of each arc-shaped clamping pin 7 is used for limiting. The lower part of the arc-shaped clamping pin 7 opens and is partially exposed outside the housing 1, which facilitates embedding and installation on the corresponding pin 12 of the IGBT module. After installation, the claw pin head is released, the lower part of the arc-shaped clamping pin retracts inward to lock the pin 12, and the upper part of the arc-shaped clamping pin 7 retracts inward to spring back the claw pin head 2 for reset.

[0023] In this invention, the inner bottom of the multiple arc-shaped clamping pins can be provided with horizontal grooves to increase friction, ensuring that the overall installation is stable after connection. The multiple arc-shaped clamping pins are also similar to a claw structure, which can well ensure the stability between the device and the pin after installation.

[0024] The upper part of the long, hollow shell 1 is a semi-circular structure 8, and the lower part is a cylindrical structure 9 with the same diameter as the semi-circular structure. The upper part of the semi-circular structure 8 and the lower part of the cylindrical structure 9 together form an inverted U-shaped shell 1.

[0025] The upper outer surface of the housing 1 is provided with a welding slot 10, and a corresponding pad opening is provided on the PCB board pad to match the welding slot 10. The diameter of the pad opening is smaller than the diameter of the lower part of the housing 1, so as to ensure that the size of the housing 1 is compatible with the pad opening and thus facilitates installation.

[0026] The welding slot 10 consists of multiple rings of welding grooves 11 on the upper outer surface of the housing. Each ring of grooves 11 is marked with a corresponding height dimension (not shown in the figure), facilitating the installation of PCB boards of corresponding thicknesses and allowing the selection of matching claw pins 2 based on the PCB board thickness, thus preventing improper assembly from affecting subsequent use of clamps to press and disassemble the module. The housing 1 is made of alloy material, with an external gold or silver plating to increase solderability.

[0027] For ease of understanding, the following is provided Figure 5 This is an assembly diagram of the present invention.

[0028] The novel IGBT module pin connection device designed in this invention allows for repeated assembly and disassembly without limitation on the number of times it can be disassembled, improving the maintainability and flexibility of the product. It effectively realizes the application of multi-module parallel connection technology of IGBT modules in actual production. At the same time, when maintenance and replacement are required, the IGBT module can be directly pressed out using a disassembly jig, and a new module can be pressed in, thereby solving the maintenance problem of IGBT modules and improving the consistency of module crimping.

[0029] The specific embodiments described herein are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A novel connection device for IGBT module pins and a PCB board, comprising a connection device embedded in each pin (12) of the IGBT module, and each connection device comprising a long, hollow housing (1) and a cylindrical claw-shaped pin head (2) disposed within the housing (1) and an elastic support structure, characterized in that: A through hole (3) is provided in the middle of the top surface of the housing (1). A claw needle (2) is installed in the through hole (3). The claw needle (2) is partially inserted into the housing and partially exposed outside the housing (1). The exposed part of the claw needle (2) passes through the corresponding opening on the PCB board pad (4) and then the top surface of the housing is soldered to the PCB board pad (4). The bottom of the claw needle (2) inserted into the housing (1) is provided with a cylindrical limiting base (5) with a diameter larger than that of the claw needle (2). The limiting base (5) is located on the outside of the housing (1) inside the housing (1). Equipped with an elastic support structure, one end of which is close to the limiting base (5) is used to support and rebound the limiting base (5) and the claw needle head (2). The other end of the elastic support structure extends out of the housing (1) after the claw needle head (2) is pressed, and is embedded in the corresponding pin (12) of the IGBT module. After the claw needle head (2) is released, the elastic support structure retracts inward and extends into the housing (1) to lock the pin (12), thereby realizing the installation and fixation between the pin (12) and the connecting device.

2. The novel IGBT module pin connection device to PCB board according to claim 1, characterized in that: The elastic support structure consists of a fixed ring (6) and multiple elastic arc-shaped clamping pins (7). The fixed ring (6) is horizontally fixed to the inner wall of the housing (1) and is higher than the limiting base. Multiple arc-shaped clamping pins (7) are evenly arranged directly below the fixed ring (6). The multiple arc-shaped clamping pins (7) and the fixed ring (6) form a frame structure that is wider at the top and narrower at the bottom. When the bottom of the arc-shaped clamping pins (7) is not under force, it is flush with the bottom of the housing (1). When the claw needle head (2) is pushed downward, its claw needle... The limiting base (5) at the bottom of the head (2) moves downward and is inserted into the frame structure. The upper part of each arc-shaped clamping pin (7) is used for limiting. The lower part of the arc-shaped clamping pin (7) opens and is partially exposed outside the housing (1), which is convenient for embedding and installation on the corresponding pin (12) of the IGBT module. After installation, the claw pin head is released, the lower part of the arc-shaped clamping pin retracts inward to lock the pin (12), and the upper part of the arc-shaped clamping pin (7) retracts inward to spring back the claw pin head (2) for reset.

3. The novel IGBT module pin and PCB board connection device according to claim 1 or 2, characterized in that: The upper part of the long, hollow shell (1) is a semi-circular structure (8), and the lower part is a cylindrical structure (9) with the same diameter as the semi-circular structure. The upper part of the semi-circular structure (8) and the lower part of the cylindrical structure (9) together form an inverted U-shaped shell (1).

4. The novel IGBT module pin connection device to PCB board according to claim 3, characterized in that: The upper outer surface of the housing (1) is provided with a welding slot (10), and a corresponding pad opening is provided on the PCB board pad to match the welding slot (10). The diameter of the pad opening is smaller than the diameter of the lower part of the housing (1), so as to ensure that the size of the housing (1) is compatible with the pad opening and thus facilitates installation.

5. The novel IGBT module pin connection device to PCB board according to claim 4, characterized in that: The welding slot (10) is a multi-ring welding slot pattern (11) set on the upper outer surface of the housing. Each ring of the slot pattern (11) is marked with a corresponding height dimension, which facilitates the installation of PCB boards of corresponding thickness. The claw needle head (2) of the matching size is selected according to the PCB board of corresponding thickness to avoid improper assembly affecting the subsequent use of clamps to press and disassemble the module.

6. The novel IGBT module pin connection device to PCB board according to claim 5, characterized in that: The housing (1) is made of alloy material and is plated with gold or silver on the outside to increase its weldability.

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