Fixed assembly, mainboard structure and inverter

Abstract

The application provides a fixing assembly, a mainboard structure and an inverter, and relates to the technical field of inverters, and solves the technical problem that the risk of screw damaging IGBT devices is relatively high in the prior art, in which the IGBT devices are directly installed on a heat sink by using screws or metal springs with screws. The device comprises a fixing part and an elastic part, the elastic part is connected with the fixing part and is used to press the IGBT devices on the heat sink, the fixing part is formed with an insertion part, the insertion part can be limited on a PCB, and the insertion part is provided with a mounting hole penetrating through the fixing part. In use, the insertion part is limited on the PCB, the screw is inserted into the mounting hole from the side of the PCB away from the IGBT devices, and when the screw is connected to the heat sink, the IGBT devices can be pressed on the heat sink by the elastic part. Since the IGBT devices are fixed, the risk of the screw damaging the IGBT devices is reduced when the screw is inserted from the side of the PCB away from the IGBT devices.

Description

Technical Field

[0001] This invention relates to the field of inverter technology, and in particular to a fixing component for IGBT devices, a motherboard structure with the fixing component, and an inverter. Background Technology

[0002] With the development of fundamental sciences such as materials science, electronic information technology, and packaging technology, discrete IGBT devices, such as IGBTs or MOSFETs, are gradually being replaced by discrete IGBT devices due to factors such as price and performance. Discrete IGBT devices have achieved widespread application in the optoelectronic field. However, in practical applications, the mounting and fixing of IGBT devices affects their performance and reliability, thus impacting product quality. Currently, in the field of photovoltaic inverters, the main methods for assembling, heat dissipating, pressing, and fixing discrete IGBT devices to PCB boards are as follows:

[0003] See Figure 1 The discrete IGBT device is mounted in reverse. Screws are inserted through these holes to mount the IGBT onto the heatsink. A PCB board is then placed on top of the IGBT, and the pins of the IGBT are connected to the PCB board to secure the IGBT to the heatsink. The diagram also shows a partial view of the PCB board to illustrate the connection between the IGBT and the heatsink.

[0004] See Figure 2 The discrete IGBT devices are mounted in reverse, pressed onto the heatsink by metal springs, and secured to the heatsink by screws. Additionally, the diagram shows a partial view of the PCB board to illustrate the connection between the IGBT devices and the heatsink.

[0005] The applicant has discovered that the prior art has at least the following technical problems:

[0006] Using screws to directly mount IGBT devices onto the heat sink carries the risk of screws damaging the transistors. Using metal springs to press the IGBT devices onto the heat sink also carries the risk of screws damaging the transistors to some extent. Summary of the Invention

[0007] The purpose of this invention is to provide a mounting component, motherboard structure, and inverter, solving the technical problem that in the prior art, directly using screws or metal springs with screws to mount IGBT devices on heat sinks carries a relatively high risk of screw damage to the IGBT devices. The numerous technical effects of the preferred solutions among the many technical solutions provided by this invention are detailed below.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] The present invention provides a fixing component, comprising a fixing member and an elastic member, wherein the elastic member is connected to the fixing member and the elastic member is used to press an IGBT device onto a heat sink, the fixing member has an insertion portion formed thereon, the insertion portion can be limited to a PCB board, and the insertion portion has a mounting hole that penetrates the fixing member.

[0010] Furthermore, the fastener also includes a main body, the insertion part is disposed on the main body and the two are connected, the insertion part passes through the elastic member and the elastic member is connected to the main body.

[0011] Furthermore, the elastic element is snap-fitted into the main body.

[0012] Furthermore, a clearance groove is formed on the surface of the main body, and a snap-fit ​​part is provided on the groove wall of the clearance groove. The elastic member passes through the clearance groove and can be snapped onto the main body through the snap-fit ​​part.

[0013] Furthermore, a side-clamping protrusion is provided on the outer periphery of the insertion part. The side-clamping protrusion is used to limit the movement of the elastic member in the direction of disengaging from the insertion part, and the side-clamping protrusion can be clamped and connected with the PCB board.

[0014] Furthermore, a positioning structure is formed on the main body, which is used to position the IGBT device.

[0015] Furthermore, a slot is formed on the main body, and a limiting part is provided on the slot wall. The limiting part is used to limit the depth of the IGBT device inserted into the slot, and the mounting hole is located on the side of the limiting part away from the insertable side of the IGBT device.

[0016] Furthermore, the main body includes a top plate and a side plate, the side plate being disposed along the circumferential direction of the top plate and connected to the top plate, and a notch being formed on the side plate to facilitate the insertion of an IGBT device.

[0017] The present invention provides a motherboard structure, including a PCB board, IGBT devices, a heat sink, and the aforementioned fixing components.

[0018] The present invention provides an inverter, including the aforementioned motherboard structure.

[0019] This invention provides a fixing assembly for IGBT devices, including a fixing member and an elastic member. The elastic member is connected to the fixing member and is used to press the IGBT device onto a heat sink. The fixing member has an insertion portion that can be limited on a PCB board, and the insertion portion has a mounting hole that penetrates the fixing member. In use, the insertion portion is limited on the PCB board, and a screw is inserted into the mounting hole from the side of the PCB board away from the IGBT device. When the screw is connected to the heat sink, the elastic member can press the IGBT device onto the heat sink. Because the screw is inserted from the side of the PCB board away from the IGBT device when fixing the IGBT device, the risk of the screw damaging the IGBT device is reduced. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of an IGBT device being fixed to a heat sink with screws in the prior art;

[0022] Figure 2 This is a schematic diagram of how IGBT devices are fixed to a heat sink using metal springs in the prior art;

[0023] Figure 3 This is a schematic diagram of the structure of the fixing component for fixing the IGBT device provided in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the fixing component for fixing the IGBT device provided in an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the fixing component provided in an embodiment of the present invention;

[0026] Figure 6 This is a cross-sectional schematic diagram of the fixing component provided in an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the structure of the fastener in the fastening assembly provided in the embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the structure of the fastener in the fastening assembly provided in the embodiment of the present invention;

[0029] Figure 9 This is a schematic diagram of the structure of the elastic element in the fixing component provided in the embodiment of the present invention.

[0030] In the diagram, 1-fixing component; 101-slot; 102-limiting part; 103-mounting hole; 104-main body; 105-insertion part; 106-side snap-fit ​​protrusion; 107-avoidance groove; 108-snap-fit ​​part; 2-elastic component; 3-PCB board; 4-IGBT device; 5-heat sink; 6-screw; 7-thermal conductive insulating sheet; 8-metal spring. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0032] See Figure 1 The IGBT device has screw holes, which are used to mount the IGBT device onto the heatsink. See also Figure 2 The IGBT device is pressed onto the heat sink by a metal spring, and the metal spring is fixed to the heat sink by screws. Figure 1 and Figure 2 In traditional IGBT fixing, there is a relatively high risk of screw damage to the IGBT device. To address this, this invention provides a fixing assembly for IGBT devices, with the following structure: It includes a fixing member 1 and an elastic member 2. The elastic member 2 is connected to the fixing member 1 and is used to press the IGBT device 4 onto a heatsink 5. The fixing member 1 has an insertion portion 105, which can be positioned on a PCB board 3 and has a mounting hole 103 penetrating the fixing member 1. In use, the insertion portion 105 is positioned on the PCB board 3, and a connector (such as a screw) is inserted into the mounting hole 103 from the side of the PCB board 3 away from the IGBT device 4. When the connector is connected to the heatsink, the elastic member 2 presses the IGBT device 4 onto the heatsink 5. Because the screw is inserted from the side of the PCB board 3 away from the IGBT device 4 when fixing the IGBT device 4, the risk of screw damage to the IGBT device is reduced.

[0033] Furthermore, this invention is applicable to both types of IGBT devices on the market, those with threaded holes and those without. Compared to multiple IGBT devices sharing a single metal contact spring, this invention reduces the contact area with the IGBT device, resulting in better heat dissipation and increased IGBT device lifespan.

[0034] Regarding the overall positional relationship between the elastic element 2 and the fixing element 1, the details are as follows: The fixing element 1 also includes a main body 104, and an insertion part 105 is disposed on the main body 104 and the two are connected. The insertion part 105 passes through the elastic element 2, and the elastic element 2 is connected to the main body 104. In use, the insertion part 105 is inserted into the PCB board, and the main body 104 is located between the PCB board and the heat sink.

[0035] Preferably, the elastic element 2 is snap-fitted to the main body 104. The snap-fit ​​connection is convenient and facilitates the installation and removal of the elastic element 2 and the main body 104.

[0036] The snap-fit ​​connection structure between the elastic element 2 and the main body 104 is as follows: (See attached image) Figure 5 and Figure 7 A clearance groove 107 is formed on the surface of the main body 104, and a snap-fit ​​part 108 is provided on the groove wall of the clearance groove 107. The elastic member 2 passes through the clearance groove 107 and can be snapped onto the main body 104 by the snap-fit ​​part 108. See Figure 7 The clearance groove 107 has protruding portions on its two opposite sides, forming locking portions 108. Preferably, the bottom shape of the clearance groove 107 matches the shape of the corresponding area of ​​the elastic member 2, so that the elastic member 2 fits against the bottom surface of the clearance groove 107. When the elastic member 2 disengages from the clearance groove 107, it can rotate relative to the insertion portion 105; when the elastic member is confined in the clearance groove 107, the elastic member 2 can be fixed to the fixing member 1. Preferably, the locking portion 108 is made of elastic material to facilitate the disassembly and installation of the elastic member 2.

[0037] Regarding the connection between the insertion part 105 and the elastic member, the specific details are as follows: A side-clamping protrusion 106 is provided on the outer periphery of the insertion part 105. The side-clamping protrusion 106 is used to limit the movement of the elastic member 2 in the direction of disengaging from the insertion part 105, and the side-clamping protrusion 106 can be clamped and connected with the PCB board 3. See also Figure 8 The diagram illustrates the side snap-fit ​​protrusion 106 on the insertion part 105. The elastic member 2 is fitted onto the insertion part 105 and is positioned between the side snap-fit ​​protrusion 106 and the main body part 104. Figure 8The diagram illustrates two side-clamping protrusions 106 symmetrically distributed on the insertion portion 105. However, the number of side-clamping protrusions 106 is not limited to two; it can be any number other than two. Regarding the shape of the insertion portion 105, it is preferably cylindrical. The insertion portion 105 needs to be inserted into a hole on the PCB board 3, and the hole machined on the PCB board 3 is usually a circular hole. Therefore, the shape of the insertion portion 105 is preferably cylindrical. When the insertion portion 105 is inserted into the PCB board 3, the side-clamping protrusions 106 deform and are pressed into the hole in the PCB board 3. Preferably, the side-clamping protrusions 106 are made of an elastic material, so that when the insertion portion 105 is inserted into the PCB board 3, the side-clamping protrusions 106 undergo elastic deformation. Furthermore, when the side-clamping protrusions 106 are made of an elastic material, it also facilitates the removal and installation of the elastic element 2.

[0038] In addition, it is preferable that a positioning structure for positioning the IGBT device 4 is formed on the main body 104 to facilitate the installation of the IGBT device 4.

[0039] Regarding the aforementioned positioning structure, the specific details are as follows: A slot 101 is formed on the main body 104, and a limiting part 102 is provided on the slot wall of the slot 101. The limiting part 102 is used to limit the depth of the IGBT device 4 inserted into the slot 101. The mounting hole 103 is located on the side of the limiting part 102 away from the insertable side of the IGBT device 4. By providing the limiting part 102, the depth of the IGBT device 4 inserted into the slot 101 can be limited, thus positioning the IGBT device 4. In addition, because the mounting hole 103 is located on the side of the limiting part 102 away from the insertable side of the IGBT device 4, it is difficult for the screw to touch the IGBT device 4 when passing through the mounting hole 103, thereby minimizing damage to the IGBT device 4 by the screw.

[0040] Regarding the structure of the main body 104, the main body 104 includes a top plate and a side plate. The side plate is disposed along the circumferential direction of the top plate and connected to the top plate. A notch is formed on the side plate to facilitate the insertion of the IGBT device 4. See [link to relevant documentation]. Figure 8 The main body 104 is block-shaped. The main body 104 has a notch on one side. See also... Figure 9 The diagram illustrates two opposing limiting portions 102. Each limiting portion 102 protrudes from the inner surface of the side plate. Because the distance between the two limiting portions 102 is less than that between the IGBT device 4, the insertion depth of the IGBT device 4 when inserted through the notch can be limited.

[0041] The specific assembly and usage of the fixing assembly for IGBT devices provided by this invention are as follows:

[0042] Step 1. Assemble the fixing component: Insert the metal elastic element 2 into the insertion part 105, and limit the elastic element 2 on the insertion part 105 by the elastic deformation recovery of the side snap-fit ​​protrusion 106; embed the elastic element 2 into the relief groove 107, and the snap-fit ​​part 108 limits the elastic element 2 in the relief groove 107 to form the fixing component.

[0043] Step 2. Fixing the fixing component and PCB board 3: The fixing component is fastened to the PCB board 2 by the side snap-fit ​​protrusion 106 on the insertion part 105;

[0044] Step 3. Transistor 5 Positioning: Insert the IGBT device into slot 101 on the fixing assembly;

[0045] Step 4. Soldering: The IGBT device is inserted into the slot 101 on the fixing assembly. The IGBT device 5 is directly soldered onto the PCB board 2 by secondary manual soldering.

[0046] Step 5. Secure the mounting components and heat sink 1 by using screws and washers to pre-tighten them to the heat sink 1 through the mounting holes 103.

[0047] The switching transistor assembly provided by this invention involves inserting a discrete IGBT into the slot 101 of a plastic fixing member 1. The IGBT device 5 is pressed together by an elastic member 2, ensuring uniform force on the discrete IGBT device 5 and allowing it to make flat contact with the heat sink 1. Simultaneously, the limiting part 102 prevents direct contact between the IGBT device 5 and the screw, effectively preventing damage to the device due to improper human operation and reducing or even eliminating the risk of damage to the IGBT device 5.

[0048] A motherboard structure includes a PCB board 3, an IGBT device 4, a heat sink 5, and a fixing component provided by the present invention. Since the structure of the fixing component has been described in detail above, it will not be repeated here.

[0049] An inverter includes the motherboard structure provided by the present invention.

[0050] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A fixing component, characterized in that, It includes a fastener (1) and an elastic element (2), wherein, The elastic member (2) is connected to the fixing member (1) and the elastic member (2) is used to press the IGBT device (4) onto the heat sink (5). An insertion part (105) is formed on the fixing member (1). The insertion part (105) can be limited on the PCB board (3) and the insertion part (105) has a mounting hole (103) that penetrates the fixing member (1). The fastener (1) further includes a main body (104), the insertion part (105) is disposed on the main body (104) and the two are connected, the insertion part (105) passes through the elastic member (2) and the elastic member (2) is connected to the main body (104); The elastic element (2) is snapped into the main body (104); A clearance groove (107) is formed on the surface of the main body (104), and a snap-fit ​​part (108) is provided on the groove wall of the clearance groove (107). The elastic member (2) passes through the clearance groove (107) and can be snapped onto the main body (104) through the snap-fit ​​part (108).

2. The fixing component according to claim 1, characterized in that, The insertion part (105) has a side snap-fit ​​protrusion (106) on its outer periphery. The side snap-fit ​​protrusion (106) is used to limit the elastic member (2) from moving away from the insertion part (105), and the side snap-fit ​​protrusion (106) can snap-fit ​​with the PCB board (3).

3. The fixing component according to claim 1, characterized in that, A positioning structure is formed on the main body (104) for positioning the IGBT device (4).

4. The fixing component according to claim 3, characterized in that, A slot (101) is formed on the main body (104), and a limiting part (102) is provided on the slot wall of the slot (101). The limiting part (102) is used to limit the depth of the IGBT device (4) inserted into the slot (101). The mounting hole (103) is located on the side of the limiting part (102) away from the side where the IGBT device (4) can be inserted.

5. The fixing component according to claim 4, characterized in that, The main body (104) includes a top plate and a side plate. The side plate is disposed along the circumferential direction of the top plate and is connected to the top plate. A notch is formed on the side plate to facilitate the insertion of the IGBT device (4).

6. A motherboard structure, characterized in that, It includes a PCB board (3), an IGBT device (4), a heat sink (5), and a fixing component as described in any one of claims 1-5.

7. An inverter, characterized in that, Includes the motherboard structure as described in claim 6.

Images