Power device fixing assembly, power device assembly, and power conversion device

Abstract

The application discloses a power device fixing assembly, a power device assembly and a power conversion device, and belongs to the technical field of electric power. The power device fixing assembly comprises an insulating cover, an insulating sheet and a pressing sheet. The insulating cover is arranged on one side of a printed circuit board. The insulating sheet is arranged on one side of a plurality of power devices away from a heat dissipation structure. The pressing sheet is arranged between the insulating cover and the insulating sheet. The pressing sheet comprises a main body part and a plurality of pressing parts connected with the main body part and separated from each other. The main body part is fixedly connected with the heat dissipation structure, and the plurality of pressing parts are elastically deformed, so that the plurality of power devices are pressed on the heat dissipation structure through the insulating sheet respectively. By adopting a single pressing sheet to press a plurality of power devices at the same time and combining the insulating cover and the insulating sheet on both sides of the pressing sheet, the assembly efficiency is improved, and the electrical safety is improved.

Description

Technical Field

[0001] This application relates to the field of power technology, and in particular to a power device fixed assembly, a power device assembly, and a power conversion device. Background Technology

[0002] In power conversion devices, power devices are the core components for realizing power conversion. Common power devices include transistors (such as MOSFETs and IGBTs), power diodes, and thyristors. These power devices are widely used in photovoltaic inverters, energy storage converters, frequency converters, electric vehicle drive systems, and other devices, undertaking the function of converting DC to AC or DC to DC power. Because power devices generate a lot of heat during operation, they are usually mounted on heat dissipation structures to achieve effective heat dissipation.

[0003] In actual assembly, elastic clamps are often used to press power devices firmly onto the heat dissipation structure to ensure good thermal contact between them. However, when multiple power devices need to be installed in the system, multiple independent elastic clamps must be configured and installed and fixed one by one, which increases the number of parts, makes the assembly process cumbersome, and is not conducive to improving assembly efficiency. Utility Model Content

[0004] This application provides a power device fixing assembly, a power device assembly, and a power conversion device, which improves assembly efficiency and enhances electrical safety, thereby at least partially solving the aforementioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, a power device fixing assembly is provided, comprising: An insulating cover is used to install on one side of a printed circuit board; An insulating sheet is used to be placed on the side of multiple power devices away from the heat dissipation structure. A pressure plate is disposed between the insulating cover and the insulating sheet. The pressure plate includes a main body and a plurality of pressing portions connected to the main body and separated from each other. The main body is fixedly connected to the heat dissipation structure, and the multiple pressing parts are elastically deformed, thereby pressing the multiple power devices onto the heat dissipation structure via the insulating sheet.

[0006] Optionally, the plurality of pressing parts are arranged in two groups, and the plurality of pressing parts in each group are arranged along a first direction. The two groups of pressing parts are respectively connected to the two ends of the main body in a second direction, and the second direction intersects the first direction.

[0007] Optionally, the pressing portion includes a first segment, a second segment, a third segment, and a fourth segment connected in sequence. The first segment is bent and connected to the main body and extends from the main body toward the insulating cover. The second segment is bent and connected to the first segment and extends from the first segment toward a direction away from the main body. The third segment is bent and connected to the second segment and is inclined from the second segment toward a direction away from the main body and toward the insulating sheet. The fourth segment is bent and connected to the third segment and extends from the third segment toward a direction away from the main body and toward the insulating cover.

[0008] Optionally, the insulating cover includes a plate and two flanges, the two flanges being bent and connected to both ends of the plate in a first direction; Wherein, at least one of the flanges has a first protrusion on the side facing the other flange, the first protrusion being located on the side of the main body away from the plate, to limit the travel of the pressing sheet in the direction away from the insulating cover; and / or, at least one flange has two first ribs on the side facing the other flange, the two first ribs being spaced apart in a second direction, the second direction intersecting the first direction, the two first ribs being located at both ends of the main body in the second direction, to limit the movement of the pressing sheet in the second direction.

[0009] Optionally, the insulating cover includes a plate and two flanges, the two flanges being bent and connected to both ends of the plate in a first direction; At least one of the flanges has a first protrusion on the side facing the other flange, the first protrusion being located on the side of the main body away from the plate to limit the travel of the pressing sheet in the direction away from the insulating cover; The main body has a notch at at least one end in the first direction, and the main body is elastic around the notch and / or the first protrusion. The main body can elastically deform around the notch and / or the first protrusion so that the first protrusion can pass over the notch.

[0010] Optionally, the insulating cover includes a plate and two flanges, the two flanges being bent and connected to both ends of the plate in a first direction; In this embodiment, at least one of the flanges has a second protrusion on the side facing the other flange, the second protrusion being located on the side of the insulating sheet away from the pressure plate, to limit the movement of the insulating sheet in the direction away from the insulating cover; and / or, the insulating sheet has a first limiting hole, the plate body has a first limiting protrusion on the side facing the pressure plate, the first limiting protrusion being offset from the pressure plate, and the first limiting protrusion being movably inserted through the first limiting hole; and / or, the insulating sheet has a second limiting hole, the plate body has a second limiting protrusion on the side facing the pressure plate, the second limiting protrusion being offset from the pressure plate, and the second limiting protrusion includes a through portion and an anti-detachment portion, the through portion being movably inserted through the second limiting hole, and the anti-detachment portion being connected to the through portion located at the end of the insulating sheet away from the pressure plate, to limit the movement of the pressure plate in the direction away from the insulating cover.

[0011] Optionally, the main body is provided with a through hole for inserting a fastener so that the main body is fixedly connected to the heat dissipation structure; the insulating cover is provided with a first clearance hole for avoiding the fastener, and the insulating sheet is provided with a second clearance hole for avoiding the fastener.

[0012] Optionally, the insulating cover has a second rib on the side opposite to the pressure plate. The second rib is arranged around the first clearance hole and is used to pass through the positioning hole of the printed circuit board.

[0013] According to a second aspect of this application, a power device assembly is provided, comprising: A printed circuit board assembly includes a printed circuit board and a plurality of power devices, wherein the plurality of power devices are disposed on one side of the printed circuit board and electrically connected to the printed circuit board; The power device fixing assembly as described in any of the above claims, wherein the power device fixing assembly is disposed between the printed circuit board and the plurality of power devices, and, A heat dissipation structure is provided on the side of the plurality of power devices away from the power device fixing assembly.

[0014] According to a third aspect of this application, a power conversion device is provided, including the power device assembly described above.

[0015] In the power device fixing assembly of this application embodiment, by providing a pressure plate including a main body and multiple holding parts, the multiple holding parts can elastically deform after the main body is connected to the heat dissipation structure. This allows multiple power devices to be simultaneously pressed onto the heat dissipation structure via an insulating sheet, thereby reducing the number of required elastic pressure plates, decreasing the total number of parts, simplifying the assembly process, and improving assembly efficiency. Simultaneously, the insulating cover, located between the pressure plate and the printed circuit board, prevents electrical contact between the pressure plate and metal traces, pads, or ground planes on the printed circuit board. The insulating sheet, located between the pressure plate and multiple power devices, prevents short circuits between the pressure plate and the multiple power devices. The insulating cover and insulating sheet work together to achieve electrical isolation on both sides of the pressure plate, avoiding the risk of short circuits caused by the pressure plate being energized, and improving safety. In summary, this assembly improves assembly efficiency and electrical safety by using a single pressure plate to simultaneously press multiple power devices, combined with insulating covers and insulating sheets on both sides of the pressure plate.

[0016] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0018] Figure 1 This is an exploded view of the power device fixing assembly and multiple power devices provided in an exemplary embodiment of this disclosure; Figure 2 yes Figure 1 A schematic diagram of the power device mounting assembly and the assembly of multiple power devices; Figure 3 yes Figure 1 A schematic diagram of the power device mounting assembly and multiple power devices from another perspective; Figure 4 yes Figure 1 A schematic diagram of the tablet compression structure in the process; Figure 5 yes Figure 1 A schematic diagram of the insulating cover in the diagram; Figure 6 yes Figure 1 Another structural diagram of the insulating cover; Figure 7yes Figure 1 A schematic diagram of the structure of the insulating sheet in the diagram; Figure 8 yes Figure 1 An assembly diagram of the insulating cover and pressure plate; Figure 9 yes Figure 1 A schematic diagram of the assembly of the power device mounting components; Figure 10 This is a schematic cross-sectional view of a power device assembly provided in an exemplary embodiment of this disclosure; Figure 11 yes Figure 10 A magnified view of part A in the diagram.

[0019] Explanation of reference numerals in the attached figures: 1000 Power device assembly; 100 Power device fixing assembly; 1 Insulating cover; 101 First clearance hole; 102 Second rib; 11 Plate; 111 First limiting protrusion; 112 Second limiting protrusion; 1121 Through part; 1122 Anti-detachment part; 12 Flanged edge; 121 First protrusion; 122 First rib; 123 Second protrusion; 2 Insulating sheet; 21 First limiting hole; 22 Second limiting hole; 23 Second clearance hole 3. Pressing plate; 31. Main body; 311. Notch; 312. Through hole; 32. Holding part; 321. First section; 322. Second section; 323. Third section; 324. Fourth section; 200. Printed circuit board assembly; 210. Printed circuit board; 2101. Positioning hole; 220. Power device; 300. Heat dissipation structure; 310. Heat sink; 3101. Heat dissipation substrate; 3102. Heat dissipation fins; 400. Fastener; 500. Insulating and thermally conductive layer. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0021] Please see Figures 1 to 3This application provides a power device fixing assembly 100, including an insulating cover 1, an insulating sheet 2, and a pressure plate 3. The insulating cover 1 is disposed on one side of a printed circuit board 210; the insulating sheet 2 is disposed on the side of a plurality of power devices 220 away from the heat dissipation structure 300; the pressure plate 3 is disposed between the insulating cover 1 and the insulating sheet 2, and the pressure plate 3 includes a main body 31 and a plurality of holding parts 32 connected to the main body 31 and separated from each other; wherein, the main body 31 is fixedly connected to the heat dissipation structure 300, and the plurality of holding parts 32 are elastically deformed, thereby pressing the plurality of power devices 220 onto the heat dissipation structure 300 via the insulating sheet 2.

[0022] In the technical solution of this application, by setting a pressure plate 3 including a main body 31 and multiple pressing parts 32, after the main body 31 is connected to the heat dissipation structure 300, the multiple pressing parts 32 can elastically deform, and the multiple power devices 220 are synchronously pressed onto the heat dissipation structure 300 via the insulating sheet 2, thereby reducing the number of elastic pressure plates 3 required, reducing the total number of parts, simplifying the assembly process, and improving assembly efficiency. At the same time, the insulating cover 1 is located between the pressure plate 3 and the printed circuit board 210, which can prevent the pressure plate 3 from making electrical contact with the metal traces, pads or ground planes on the printed circuit board 210; the insulating sheet 2 is located between the pressure plate 3 and the multiple power devices 220, which can prevent the pressure plate 3 from short-circuiting with the multiple power devices 220; the insulating cover 1 and the insulating sheet 2 work together to achieve electrical isolation on both sides of the pressure plate 3, avoiding the risk of short circuit caused by the pressure plate 3 being energized, and improving the safety of use. In summary, this component improves assembly efficiency and enhances electrical safety by using a single pressure plate 3 to simultaneously press multiple power devices 220, combined with insulating covers 1 and insulating sheets 2 on both sides of the pressure plate 3.

[0023] Please see Figure 1 and Figure 4In some embodiments, the multiple holding portions 32 are arranged in two groups, with each group of holding portions 32 arranged along a first direction. The two groups of holding portions 32 are respectively connected to the two ends of the main body 31 in a second direction, which intersects the first direction. For example, the first direction and the second direction can form an acute angle, an obtuse angle, or a right angle. Typically, they are perpendicular to each other to form a stable rectangular or quasi-rectangular layout, which is suitable for the arrangement of multiple power devices 220 on the printed circuit board 210. In these embodiments, the two groups of holding portions 32 are located at opposite ends of the main body 31. When the main body 31 is connected to the heat dissipation structure 300, the holding portions 32 on both sides can deform in coordination and apply clamping force synchronously, thereby making the pressure distribution on the multiple power devices 220 more balanced. This balanced clamping force helps ensure the reliability of thermal contact between each power device 220 and the heat dissipation structure 300, avoiding damage to the power device 220 due to excessive local pressure or problems such as increased contact thermal resistance and poor heat dissipation due to insufficient local pressure, thus improving the overall stability of the clamping and the reliability of long-term operation.

[0024] Please see Figure 4 In some embodiments, the pressing portion 32 includes a first segment 321, a second segment 322, a third segment 323, and a fourth segment 324 connected in sequence. The first segment 321 is bent and connected to the main body 31, extending from the main body 31 toward the insulating cover 1. The second segment 322 is bent and connected to the first segment 321, extending from the first segment 321 away from the main body 31. The third segment 323 is bent and connected to the second segment 322, inclined from the second segment 322 toward the insulating sheet 2 and away from the main body 31. The fourth segment 324 is bent and connected to the third segment 323, extending from the third segment 323 away from the main body 31 and toward the insulating cover 1. In these embodiments, the pressing portion 32 is formed by connecting and bending the first segment 321 to the fourth segment 324 in sequence, creating a cantilevered pressing structure with elasticity and structural strength. This multi-stage bending design increases the deformation path of the clamping portion 32, enabling it to generate greater elastic deformation under stress. This better accommodates minor height differences in the power devices 220 or dimensional tolerances during assembly, ensuring that each power device 220 is stably and uniformly clamped. Simultaneously, the multiple bending segments make the overall structure of the clamping portion 32 more robust, less prone to twisting or instability under pressure, thus improving its resistance to deformation and structural strength. In summary, this clamping portion 32, while ensuring good elasticity, also possesses sufficient strength and stability, which is beneficial for achieving long-term reliable clamping performance.

[0025] Please see Figure 5 , Figure 6 and Figure 8In some embodiments, the insulating cover 1 includes a plate 11 and two flanges 12, which are bent and connected to both ends of the plate 11 in a first direction. At least one flange 12 has a first protrusion 121 on the side facing the other flange 12. The first protrusion 121 is located on the side of the main body 31 away from the plate 11 to limit the travel of the pressure plate 3 in the direction away from the insulating cover 1. In these embodiments, the first protrusion 121 works in conjunction with the plate 11 to prevent the pressure plate 3 from falling off the insulating cover 1 during handling or pre-assembly, thereby achieving pre-assembly of the pressure plate 3 and the insulating cover 1, facilitating overall component management and assembly operations. Meanwhile, an appropriate gap is maintained between the first protrusion 121 and the main body 31 of the pressure plate 3, allowing the main body 31 to maintain a certain degree of freedom of movement in the direction of approaching or moving away from the insulating cover 1. This allows for fine-tuning during final assembly based on the actual relative positions of the printed circuit board 210 and the power device 220, ensuring a good fit between the insulating cover 1 and the printed circuit board 210, and accurate pressing direction of the pressure plate 3 on the power device 220. This avoids poor contact or structural stress caused by assembly errors. In summary, this insulating cover 1 structure, while achieving anti-detachment and limiting of the pressure plate 3, also considers the convenience of pre-assembly and the alignment adaptability of the final assembly, ensuring the reliability of the crimping.

[0026] In some embodiments, each flange 12 has a first protrusion 121 on the side facing the other flange 12, and both first protrusions 121 are located on the side of the main body 31 away from the plate 11, so as to jointly form a symmetrical limit on the main body 31 of the pressing tablet 3. This symmetrical arrangement helps to improve the stability of the pressing tablet 3 in the pre-assembled state.

[0027] Please see Figure 5 , Figure 6 and Figure 8 In some embodiments, the insulating cover 1 includes a plate 11 and two flanges 12. The two flanges 12 are bent and connected to both ends of the plate 11 in a first direction. At least one flange 12 has two first ribs 122 on the side facing the other flange 12. The two first ribs 122 are spaced apart in a second direction, which intersects with the first direction. The two first ribs 122 are located at both ends of the main body 31 in the second direction to restrict the movement of the pressure plate 3 in the second direction. In these embodiments, the two first ribs 122 are spaced apart in the second direction and located at both ends of the main body 31 in the second direction. This restricts the movement of the pressure plate 3 in the second direction. Combined with the limiting effect of the two flanges 12 in the first direction, it achieves bidirectional stable positioning of the main body 31 of the pressure plate 3 in the plane, effectively preventing it from shifting or rotating during handling or pre-assembly. At the same time, the cooperation between the first ribs 122 and the side edge of the main body 31 can play a guiding role during assembly, which helps to quickly align and assemble the pressure plate 3 and the insulating cover 1, improving pre-assembly efficiency.

[0028] In some embodiments, each flange 12 has two first ribs 122 on the side facing the other flange 12, and the four first ribs 122 form two pairs of first ribs 122. The two pairs of first ribs 122 are spaced apart in the first direction, and each pair of first ribs 122 is located at both ends of the main body 31 in the second direction. This structure enhances the limiting effect of the pressure plate 3 in the second direction, helping to prevent it from shifting or twisting during pre-assembly and transportation. At the same time, the paired first ribs 122 can provide guidance during assembly, improving the alignment efficiency and assembly smoothness of the pressure plate 3 and the insulating cover 1. In summary, this design is beneficial to improving pre-assembly reliability and assembly convenience.

[0029] Please see Figure 4 , Figure 5 , Figure 6 and Figure 8 In some embodiments, the insulating cover 1 includes a plate 11 and two flanges 12, which are bent and connected to both ends of the plate 11 in a first direction. At least one flange 12 has a first protrusion 121 on the side facing the other flange 12. The first protrusion 121 is located on the side of the main body 31 away from the plate 11 to limit the movement of the pressure plate 3 in the direction away from the insulating cover 1. The main body 31 has a notch 311 at at least one end in the first direction. The portion of the main body 31 surrounding the notch 311 and / or the first protrusion 121 is elastic, and the portion of the main body 31 surrounding the notch 311 and / or the first protrusion 121 can elastically deform so that the first protrusion 121 can pass over the notch 311. In these embodiments, the first protrusion 121 can limit the movement of the pressure plate 3 in the direction away from the insulating cover 1, preventing it from falling off during handling or pre-assembly, realizing the pre-assembly of the pressure plate 3 and the insulating cover 1, and facilitating component management. Meanwhile, by providing a notch 311 in the main body 31 and making the area around the first protrusion 121 and / or the notch 311 elastic, the first protrusion 121 can elastically pass over the notch 311 during assembly, achieving rapid engagement between the pressure plate 3 and the insulating cover 1. This structure significantly reduces assembly difficulty and improves pre-assembly efficiency and ease of operation without sacrificing the reliability of the limiting position.

[0030] Please see Figure 5 , Figure 8 and Figure 9In some embodiments, the insulating cover 1 includes a plate 11 and two flanges 12, which are bent and connected to both ends of the plate 11 in a first direction. At least one flange 12 has a second protrusion 123 on the side facing the other flange 12. The second protrusion 123 is located on the side of the insulating sheet 2 away from the pressure plate 3 to limit the movement of the insulating sheet 2 in the direction away from the insulating cover 1. In these embodiments, the second protrusion 123 works in conjunction with the plate 11 to limit the movement of the insulating sheet 2 in the direction away from the insulating cover 1, preventing it from falling off the insulating cover 1 before handling or assembly. This allows for pre-assembly of the insulating sheet 2 and the insulating cover 1, facilitating overall component management and assembly operations. Simultaneously, a suitable gap is maintained between the second protrusion 123 and the insulating sheet 2, allowing the insulating sheet 2 to maintain a certain degree of freedom of movement under the action of the pressure plate 3. This allows it to be pressed down synchronously with the pressure plate 3 during the final pressing process, ensuring it is flatly clamped between the pressure plate 3 and the power device 220, achieving reliable insulation. In summary, this structure ensures the assembly stability of the insulating sheet 2 while also taking into account the adaptability and reliability of the crimping process.

[0031] Please see Figure 5 , Figure 7 , Figure 8 and Figure 9 In some embodiments, the insulating cover 1 includes a plate 11 and two flanges 12, the two flanges 12 being bent and connected to both ends of the plate 11 in a first direction; wherein, the insulating sheet 2 is provided with a first limiting hole 21, and the side of the plate 11 facing the pressure plate 3 is provided with a first limiting protrusion 111, the first limiting protrusion 111 being offset from the pressure plate 3 (see...). Figure 8 The first limiting protrusion 111 is located in the gap area between the two pressing parts 32 to avoid the pressing sheet 3), and the first limiting protrusion 111 is movably inserted through the first limiting hole 21. In these embodiments, the first limiting protrusion 111 on the plate 11 is movably inserted through the first limiting hole 21 of the insulating sheet 2, which can effectively limit the movement of the insulating sheet 2 in the extension direction, preventing it from shifting or moving during handling or assembly, and improving the assembly stability between the insulating sheet 2 and the insulating cover 1. At the same time, the cooperation between the first limiting protrusion 111 and the first limiting hole 21 can provide a guiding effect during assembly, guiding the insulating sheet 2 to be quickly aligned and improving pre-assembly efficiency. In summary, this structure enhances the positioning reliability of the insulating sheet 2 while taking into account the ease of assembly.

[0032] Please see Figure 5 , Figure 7 , Figure 8 and Figure 9In some embodiments, the insulating cover 1 includes a plate 11 and two flanges 12, which are respectively bent and connected to both ends of the plate 11 in a first direction; wherein, the insulating sheet 2 is provided with a second limiting hole 22, and the side of the plate 11 facing the pressure plate 3 is provided with a second limiting protrusion 112, which is offset from the pressure plate 3 (see...). Figure 8 The second limiting protrusion 112 is located in the non-interference area between the pressure plate 3 and the insulating cover 1, such as in the gap area between the two holding parts 32 or in the circumferential outer area of ​​the pressure plate 3 (to achieve spatial avoidance). The second limiting protrusion 112 includes a through part 1121 and an anti-detachment part 1122. The through part 1121 is movably inserted through the second limiting hole 22, and the anti-detachment part 1122 is connected to the end of the through part 1121 located on the insulating sheet 2 away from the pressure plate 3, so as to limit the movement of the pressure plate 3 in the direction away from the insulating cover 1. In these embodiments, the anti-detachment part 1122 of the second limiting protrusion 112 is located on the side of the insulating sheet 2 away from the pressure plate 3, and cooperates with the plate body 11 to form an axial stop to prevent the insulating sheet 2 from falling off during handling or assembly. The through part 1121 of the second limiting protrusion 112 is movably inserted into the second limiting hole 22 of the insulating sheet 2, which can limit the movement of the insulating sheet 2 in the plane and improve its positioning accuracy. This structure integrates planar limiting and axial anti-detachment functions, enabling the insulating sheet 2 to be stably pre-installed with the insulating cover 1, facilitating component management.

[0033] Please see Figure 4 , Figure 5 and Figure 7 In some embodiments, the main body 31 is provided with a through hole 312 for inserting a fastener 400 (e.g., a screw, bolt, stud, etc.) to fix the main body 31 to the heat dissipation structure 300 (in conjunction with...). Figure 10 and Figure 11 The insulating cover 1 has a first clearance hole 101 for avoiding fasteners 400, and the insulating sheet 2 has a second clearance hole 23 for avoiding fasteners 400. In these embodiments, by providing a through hole 312 in the main body 31 and using the fastener 400 to pass through the hole to fix the main body 31 to the heat dissipation structure 300, a reliable mechanical connection between the pressure plate 3 and the heat dissipation structure 300 can be achieved, ensuring stable transmission and long-term maintenance of the clamping force, and improving the crimping reliability of the power device 220. At the same time, the first clearance hole 101 on the insulating cover 1 and the second clearance hole 23 on the insulating sheet 2 provide a through passage for the fastener 400, allowing it to pass smoothly through the insulating cover 1 and the insulating sheet 2 during assembly, avoiding interference.

[0034] In other embodiments, the main body 31 and the heat dissipation structure 300 can also be fixedly connected by means of adhesive bonding, snap-fitting, etc.

[0035] Please see Figure 5 and Figure 6 In some embodiments, the insulating cover 1 has a second rib 102 on the side opposite to the pressure plate 3. The second rib 102 is arranged around the first clearance hole 101 and is used to pass through the positioning hole 2101 of the printed circuit board 210 (in conjunction with...). Figure 10 and Figure 11 In these embodiments, the second rib 102 is disposed around the first clearance hole 101 and passes through the positioning hole 2101 of the printed circuit board 210, enabling accurate alignment between the insulating cover 1 and the printed circuit board 210 and preventing displacement during assembly or handling. Simultaneously, this structure acts as a guide during assembly, facilitating the quick and accurate installation of the insulating cover 1 onto the printed circuit board 210. Furthermore, the space formed by the second rib 102 around the first clearance hole 101 provides an installation clearance channel for the fastener 400 to pass through from the side of the printed circuit board 210 away from the insulating cover 1, avoiding interference with the insulating cover 1. In summary, this second rib 102 structure achieves integrated functions of positioning, guiding, and installation clearance, improving the assembly accuracy and manufacturability of the component.

[0036] In some embodiments, the pressure plate 3 is a metal part, which can be made of a metal material with excellent elasticity, high strength and good corrosion resistance, such as stainless steel (e.g., 301, 304) and spring steel (e.g., 65Mn, 60Si2Mn). The pressure plate 3 can be integrally formed by sheet metal processes such as stamping, bending and forming, with high structural precision, suitable for mass production. The metal material ensures that the pressure plate 3 has sufficient elastic recovery capacity and structural strength during long-term use, and is not prone to plastic deformation or fatigue failure under repeated assembly and clamping conditions, thereby ensuring continuous and reliable clamping of the power device 220.

[0037] Please see Figure 10 and Figure 11According to a second aspect of this application, a power device assembly 1000 is provided, including a printed circuit board assembly 200, a power device fixing assembly 100, and a heat dissipation structure 300. The printed circuit board assembly 200 includes a printed circuit board 210 and a plurality of power devices 220. The plurality of power devices 220 are disposed on one side of the printed circuit board 210 and electrically connected to pads on the printed circuit board 210 through their pins, for example, by soldering (such as reflow soldering or wave soldering) to achieve reliable electrical interconnection. The structure of the power device fixing assembly 100 is as described in the above embodiment. The power device fixing assembly 100 is disposed between the printed circuit board 210 and the plurality of power devices 220 for pressing and fixing the power devices 220. The pressing portion 32 of the pressure plate 3 acts on the main body portion 31 of the power device 220 (such as a conductive base plate or shell), rather than its pin area, to avoid stress interference to the pin connection. The heat dissipation structure 300 is disposed on the side of the plurality of power devices 220 away from the power device fixing assembly 100. Since the power device assembly 1000 adopts all the technical solutions of all the above embodiments, it has at least the beneficial effects brought about by the above embodiments, which will not be described in detail here.

[0038] The power device 220 can be a transistor (such as an IGBT, MOSFET, or BJT), a diode, a thyristor (such as an SCR or GTO), a power module (such as an IPM or DPM), a silicon carbide (SiC) device, a gallium nitride (GaN) device, etc. This application does not limit the specific type of the power device 220; as long as it has heat dissipation requirements and can be reliably pressed onto the heat dissipation structure 300 by the pressure plate 3 structure to achieve heat conduction and mechanical fixation, this technical solution is applicable. The heat generated by the power device 220 during operation can be effectively dissipated through the heat dissipation structure 300, improving the stability and lifespan of the device.

[0039] Please see Figure 10 and Figure 11In some embodiments, the heat dissipation structure 300 includes a heat sink 310, which includes a heat dissipation substrate 3101 and heat dissipation fins 3102 disposed on one side of the heat dissipation substrate 3101. The power device fixing assembly 100 presses multiple power devices 220 onto the side of the heat dissipation substrate 3101 away from the heat dissipation fins 3102. An insulating thermally conductive layer 500 (e.g., a ceramic sheet, an aluminum nitride substrate, or a beryllium oxide sheet) may also be provided between the multiple power devices 220 and the heat dissipation substrate 3101 to provide an efficient heat conduction path while achieving electrical insulation, preventing short circuits between the power devices 220 and the heat dissipation substrate 3101. To further reduce the contact thermal resistance between interfaces and improve heat conduction efficiency, thermally conductive adhesive (such as thermally conductive silicone grease, thermally conductive gel, or thermally conductive pads) may be applied to both sides of the insulating thermally conductive layer 500 to form a continuous, low-resistance heat transfer path between the power devices 220, the insulating thermally conductive layer 500, and the heat dissipation substrate 3101. This structure helps to quickly dissipate the heat generated by the power device 220 during operation, improving the heat dissipation capacity and operational reliability of the component.

[0040] In other embodiments, the heat dissipation structure 300 can also be a liquid cooling plate. The liquid cooling plate has internal cooling channels that allow the circulating cooling medium (such as water or ethylene glycol solution) to directly remove the heat generated by the power devices 220, resulting in extremely high heat dissipation efficiency. When using a liquid cooling plate, the power device fixing assembly 100 presses multiple power devices 220 onto the surface of the liquid cooling plate. An insulating thermally conductive layer 500 and thermally conductive adhesive can also be provided between the two to achieve electrical isolation and efficient heat conduction.

[0041] According to a third aspect of this application, a power conversion device is provided, including a power device assembly 1000. The structure of the power device assembly 1000 is as described in the above embodiments. Since this power conversion device adopts all the technical solutions of all the above embodiments, it has at least the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0042] The power conversion device can be an inverter, rectifier, frequency converter, DC-DC converter, AC-DC power module, motor driver, new energy power conversion system (such as photovoltaic inverter, wind power converter), electric vehicle on-board charger (OBC), or electric drive controller (inverter), etc. This application does not limit the specific type of power conversion device.

[0043] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0044] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0045] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0046] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A power device fixing assembly (100), characterized in that, include: An insulating cover (1) is provided on one side of a printed circuit board (210); An insulating sheet (2) is provided on the side of multiple power devices (220) away from the heat dissipation structure (300); A pressure plate (3) is disposed between the insulating cover (1) and the insulating sheet (2). The pressure plate (3) includes a main body (31) and a plurality of pressing parts (32) that are connected to the main body (31) and separated from each other. The main body (31) is fixedly connected to the heat dissipation structure (300), and the plurality of pressing parts (32) undergo elastic deformation, thereby pressing the plurality of power devices (220) onto the heat dissipation structure (300) via the insulating sheet (2).

2. The power device fixing assembly (100) according to claim 1, characterized in that, The plurality of the holding parts (32) are arranged in two groups. The plurality of holding parts (32) in each group are arranged along a first direction. The two groups of holding parts (32) are respectively connected to the two ends of the main body (31) in a second direction. The second direction intersects the first direction.

3. The power device fixing assembly (100) according to claim 1, characterized in that, The pressing part (32) includes a first segment (321), a second segment (322), a third segment (323), and a fourth segment (324) connected in sequence. The first segment (321) is bent and connected to the main body (31). The first segment (321) extends from the main body (31) toward the insulating cover (1). The second segment (322) is bent and connected to the first segment (321). The second segment (322) extends from the first segment (321) toward a direction away from the main body (31). The third segment (323) is bent and connected to the second segment (322). The third segment (323) is inclined from the second segment (322) toward a direction away from the main body (31) and toward the insulating sheet (2). The fourth segment (324) is bent and connected to the third segment (323). The fourth segment (324) extends from the third segment (323) toward a direction away from the main body (31) and toward the insulating cover (1).

4. The power device fixing assembly (100) according to claim 1, characterized in that, The insulating cover (1) includes a plate (11) and two flanges (12), which are respectively bent and connected to the two ends of the plate (11) in a first direction; In this embodiment, at least one of the flanges (12) has a first protrusion (121) on the side facing the other flange (12), the first protrusion (121) is located on the side of the main body (31) away from the plate (11) to limit the travel of the pressing sheet (3) in the direction away from the insulating cover (1); and / or, at least one of the flanges (12) has two first ribs (122) on the side facing the other flange (12), the two first ribs (122) are spaced apart in a second direction, the second direction intersects the first direction, and the two first ribs (122) are respectively located at both ends of the main body (31) in the second direction to limit the movement of the pressing sheet (3) in the second direction.

5. The power device fixing assembly (100) according to claim 1, characterized in that, The insulating cover (1) includes a plate (11) and two flanges (12), which are respectively bent and connected to the two ends of the plate (11) in a first direction; At least one of the flanges (12) has a first protrusion (121) on the side facing the other flange (12), the first protrusion (121) being located on the side of the main body (31) away from the plate (11) to limit the travel of the pressure plate (3) in the direction away from the insulating cover (1); The main body (31) has a notch (311) at at least one end in the first direction. The main body (31) is elastic around the notch (311) and / or the first protrusion (121). The main body (31) is elastically deformable around the notch (311) and / or the first protrusion (121) so that the first protrusion (121) can pass over the notch (311).

6. The power device fixing assembly (100) according to claim 1, characterized in that, The insulating cover (1) includes a plate (11) and two flanges (12), which are respectively bent and connected to the two ends of the plate (11) in a first direction; At least one of the flanges (12) has a second protrusion (123) on the side facing the other flange (12), the second protrusion (123) being located on the side of the insulating sheet (2) away from the pressure plate (3) to limit the movement of the insulating sheet (2) away from the insulating cover (1); and / or, the insulating sheet (2) has a first limiting hole (21), and the plate (11) has a first limiting protrusion (111) on the side facing the pressure plate (3), the first limiting protrusion (111) being offset from the pressure plate (3), and the first limiting protrusion (111) being movably inserted through the first limiting hole (21); and / Or, the insulating sheet (2) is provided with a second limiting hole (22), and the plate body (11) is provided with a second limiting protrusion (112) on the side facing the pressure plate (3). The second limiting protrusion (112) is offset from the pressure plate (3), and the second limiting protrusion (112) includes a through part (1121) and an anti-detachment part (1122). The through part (1121) is movably inserted through the second limiting hole (22), and the anti-detachment part (1122) is connected to the end of the through part (1121) located on the insulating sheet (2) away from the pressure plate (3) to limit the movement of the pressure plate (3) in the direction away from the insulating cover (1).

7. The power device fixing assembly (100) according to claim 1, characterized in that, The main body (31) is provided with a through hole (312) for fasteners (400) to pass through, so that the main body (31) is fixedly connected to the heat dissipation structure (300); the insulating cover (1) is provided with a first clearance hole (101) for clearance of the fasteners (400); the insulating sheet (2) is provided with a second clearance hole (23) for clearance of the fasteners (400).

8. The power device fixing assembly (100) according to claim 7, characterized in that, The insulating cover (1) has a second rib (102) on the side away from the pressure plate (3). The second rib (102) is arranged around the first clearance hole (101) and is used to pass through the positioning hole (2101) of the printed circuit board (210).

9. A power device assembly (1000), characterized in that, include: A printed circuit board assembly (200) includes a printed circuit board (210) and a plurality of power devices (220), wherein the plurality of power devices (220) are disposed on one side of the printed circuit board (210) and electrically connected to the printed circuit board (210); The power device fixing assembly (100) as described in any one of claims 1 to 8, wherein the power device fixing assembly (100) is disposed between the printed circuit board (210) and the plurality of power devices (220), and, A heat dissipation structure (300) is provided on the side of the plurality of power devices (220) away from the power device fixing assembly (100).

10. A power conversion device, characterized in that, Includes the power device assembly (1000) as described in claim 9.

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