Power conversion device
By using a combination of limiting bosses and elastic elements in the power conversion equipment, the problem of interference between the elastic elements and the module position is solved, achieving precise positioning and stable heat dissipation of the module, and ensuring the insulation and heat dissipation performance of the equipment.
Patent Information
- Application Number
- CN202422336459.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-24
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-09-24
AI Technical Summary
In existing power conversion equipment, the elastic element interferes with the position of the power module, resulting in insufficient positional accuracy and affecting heat dissipation and stability.
The system employs a combination of limiting bosses and elastic components. The limiting bosses restrict the position of the power module, while the elastic components push against the module away from the circuit board to ensure close contact with the heat sink. The pressure is adjusted using fastening bolts and limiting posts to ensure heat dissipation requirements are met.
It improves the position accuracy and stability of the power module, enhances the heat dissipation effect, extends the service life of the equipment, and ensures the insulation performance.
Smart Images
Figure CN223488082U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of power equipment technology, specifically to a power conversion device. Background Technology
[0002] Power conversion devices such as inverters and rectifiers generally include circuit boards, power modules, and heat sinks, with the power modules positioned between the circuit boards and the heat sink. The power modules are electrically connected to the circuit boards and in contact with the heat sink. Power conversion devices also include a mounting cover and a spring-loaded component. The mounting cover is connected to the circuit board, and the spring-loaded component is positioned between the mounting cover and the power modules. The mounting cover is connected to the heat sink, and the spring-loaded component can press against the power modules, maintaining contact between the power modules and the heat sink, thus ensuring effective heat dissipation from the heat sink. However, during power module installation, the spring-loaded component between the power modules and the mounting cover can interfere with the positioning of the power modules, resulting in insufficient positional accuracy. Utility Model Content
[0003] This application provides a power conversion device that can determine the position of the power module and improve the positional accuracy of the power module.
[0004] In a first aspect, embodiments of this application provide a power conversion device, including a circuit board, a first power module, a heat sink, and a fixing cover. The fixing cover is used to connect to the circuit board, and a mounting groove is provided on the side of the fixing cover away from the circuit board. A first limiting boss is provided in the mounting groove. At least a portion of the first power module is located in the mounting groove, and the surface of the first power module facing the circuit board abuts against the first limiting boss. The power conversion device also includes an elastic member, which is disposed in the mounting groove and within a cavity formed by the surface of the fixing cover away from the circuit board, the first limiting boss, and the surface of the first power module near the fixing cover. The first power module is located between the heat sink and the fixing cover. The elastic member is fixedly connected to the heat sink and abuts against the first power module in a direction away from the circuit board, so that the first power module contacts the heat sink.
[0005] The power conversion device includes a fixed cover and an elastic element. The fixed cover has a mounting groove on the side facing away from the circuit board, and a first limiting boss is provided within the mounting groove. A first power module is placed in the mounting groove and contacts the first limiting boss. The first limiting boss limits the height of the first power module, determines its position, and improves its positional accuracy. The elastic element pushes against the first power module away from the circuit board, causing pressure to press the first power module against the heat sink. This ensures that the pressure exerted by the first power module on the heat sink meets the heat dissipation requirements, improving the cooling effect on the first power module.
[0006] In some embodiments that may include the above embodiments, there is a detachable connection between the elastic element and the fixed cover.
[0007] The detachable connection between the elastic element and the fixed cover facilitates the replacement of the elastic element and extends the service life of the power conversion equipment.
[0008] In some embodiments that may include the above embodiments, the groove wall of the mounting groove is provided with a first stop flange and a second stop flange, the first stop flange and the second stop flange are arranged opposite to each other, one end of the elastic member is located between the first stop flange and the bottom of the mounting groove, and the other end of the elastic member is located between the second stop flange and the bottom of the mounting groove.
[0009] The first and second stop flanges can restrict the position of the elastic element and prevent it from moving. At the same time, the first and second stop flanges are small in size and are integral with the fixing cover, which can reduce the processing difficulty of the fixing cover and reduce its size.
[0010] In some embodiments that may include the above embodiments, the elastic element includes a metal sheet, and the power conversion device further includes an insulating sheet located between the elastic element and the first power module.
[0011] The elastic element, including a metal sheet, ensures the long-term effectiveness of the pressure on the first power module, facilitating its normal operation. However, because the elastic element is a metal sheet, direct contact with the first power module can affect its insulation performance, potentially leading to overvoltage or overcurrent. The insulating sheet ensures the insulation performance of the first power module, guaranteeing its normal operation.
[0012] In some embodiments that may include the above embodiments, the power conversion device further includes a fastening bolt, an elastic element having a mounting hole, a fastening screw passing through the mounting hole and engaging with a threaded hole on the heat sink.
[0013] When the fastening bolts are tightened into the threaded holes on the radiator, the elastic element presses the power module closer to the radiator, making the power module in close contact with the radiator and ensuring the heat dissipation capacity of the power module.
[0014] In some embodiments that may include the above embodiments, a limiting post is provided on the surface of the elastic element away from the circuit board, and the mounting hole passes through the limiting post, which is used to abut against the heat sink.
[0015] By adjusting the length of the limiting post, the pressure of the fastening bolt on the elastic element can be controlled, thereby controlling the pressure of the elastic element on the first power module, and further controlling the pressure of the first power module on the heat sink. The length of the limiting post can be adjusted according to the actual heat dissipation requirements of the first power module.
[0016] In some embodiments that may include the above embodiments, the elastic member includes an abutting portion and a fixing portion. The abutting portion contacts the first power module and is used to abut against the first power module. A mounting hole is provided on the fixing portion, and a notch is provided on the edge of the fixing portion.
[0017] The edges of the fixing part are provided with notches, which can disperse the stress of the fixing part, making the elastic element more evenly stressed, avoiding deformation of the elastic element and affecting its normal use.
[0018] In some embodiments that may include the above embodiments, the power conversion device further includes a second power module located between the heat sink and the fixing cover. A second limiting boss is provided in the mounting groove, at least a portion of the second power module is located in the mounting groove, and the surface of the second power module facing the circuit board abuts against the second limiting boss. The elastic member includes a first abutting portion and a second abutting portion, the first abutting portion being used to abut against the first power module, and the second abutting portion being used to abut against the second power module.
[0019] The first power module abuts against the first limiting boss, and the second power module abuts against the second limiting boss, thus determining the positions of the first and second power modules. The first and second limiting bosses are spaced apart, creating a certain distance between the first and second power modules, which prevents mutual interference and improves their stability. The first and second abutting parts ensure that the first and second power modules are in close contact with the heat sink under pressure, guaranteeing effective heat dissipation for both modules.
[0020] In some embodiments that may include the above embodiments, a positioning post is provided on the side of the fixed cover near the circuit board, and a positioning hole matching the positioning post 314 is provided on the circuit board, with the positioning post passing through the positioning hole.
[0021] The positioning post 314, in conjunction with the positioning hole, can determine the position of the fixing cover on the circuit board. Since the first power module is placed in the mounting groove of the fixing cover, the position of the first power module can be determined by confirming the position of the fixing cover.
[0022] In some embodiments that may include the above embodiments, the side wall of the positioning post is provided with an anti-rotation protrusion, and the circuit board is provided with a recess corresponding to the anti-rotation protrusion. The anti-rotation protrusion and the recess cooperate to prevent the fixing cover from rotating relative to the circuit board.
[0023] The anti-rotation protrusion and recess work together to ensure the stability of the fixing cover, prevent the fixing cover from rotating relative to the circuit board, and avoid the fixing cover from detaching from the circuit board. Attached Figure Description
[0024] Figure 1An exploded view of the power conversion device provided in the embodiments of this application;
[0025] Figure 2 This is a schematic diagram showing the connection between the power module and the circuit board provided in an embodiment of this application;
[0026] Figure 3 for Figure 2 A sectional view along the AA direction;
[0027] Figure 4 A top view of the fixed cover provided in an embodiment of this application;
[0028] Figure 5 A perspective view of the fixing cover provided in an embodiment of this application;
[0029] Figure 6 This is a schematic diagram showing the connection between the elastic element and the fixed cover provided in the embodiments of this application;
[0030] Figure 7 A schematic diagram showing the elastic element used in an embodiment of this application abutting the power module to bring it into contact with the heat sink;
[0031] Figure 8 This is a schematic diagram showing the contact between the elastic element and the power module provided in an embodiment of this application.
[0032] Explanation of reference numerals in the attached figures:
[0033] 10: Power conversion device; 11: Circuit board; 12: Heat sink; 121: Groove; 13: Ceramic plate; 20: First power module; 21: Second power module; 31: Fixing cover; 311: Locking block; 312: Anti-rotation protrusion; 313: Limiting rib; 314: Positioning post; 32: Elastic element; 321: Mounting hole; 33: Insulating sheet; 34: Fastening bolt; 41: Mounting groove; 411: First stop flange; 412: Second stop flange; 42a: First limiting boss; 42b: Second limiting boss; 51: Abutment part; 51a: First abutment part; 51b: Second abutment part; 52: Fixing part; 521: Notch; 53: Limiting post. Detailed Implementation
[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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 some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0035] Hereinafter, the terms "first," "second," etc., 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 with "first," "second," etc., may explicitly or implicitly include one or more of that feature.
[0036] Furthermore, in the embodiments of this application, directional terms such as "up," "down," "left," "right," "horizontal," and "vertical" are defined relative to the orientation of the components shown in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the orientation of the components in the accompanying drawings.
[0037] In the embodiments of the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integrated connection; it can be a direct connection or an indirect connection through an intermediate medium.
[0038] It should be noted that, in the description of the embodiments of this application, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection or an integral connection; they can also refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.
[0039] Please refer to Figure 1 This application provides a power conversion device 10, including a circuit board 11, a heat sink 12, and a first power module 20. The circuit board 11 is disposed on one side of the first power module 20, and the first power module 20 is soldered onto the circuit board 11. The heat sink 12 is disposed on the side of the first power module 20 opposite to the circuit board 11. One end of the power conversion device 10 can be connected to the power grid, and the other end can be connected to a battery or other equipment to process the current from the power grid to meet charging and discharging requirements.
[0040] This application does not limit the power conversion device 10. For example, the power conversion device 10 may include an inverter, a rectifier, a power conversion system (PCS), etc.
[0041] In embodiments where the power conversion device 10 includes an inverter, the power conversion device 10 can convert the direct current (DC) power from the battery into alternating current (AC) power and transmit it to the power grid. In embodiments where the power conversion device 10 includes a rectifier, the power conversion device 10 can convert the AC power from the power grid into DC power and store it in the battery.
[0042] Since the first power module 20 generates a lot of heat during operation, and the temperature of the first power module 20 is relatively high, the heat sink 12 is located on the side of the first power module 20 away from the circuit board 11, which can accelerate the cooling speed of the first power module 20, improve the heat dissipation capacity of the first power module 20, and ensure the normal use of the first power module 20.
[0043] This application does not limit the heat sink 12. For example, the heat sink 12 can be an air-cooled heat sink or a liquid-cooled heat sink. In an embodiment where the heat sink 12 includes an air-cooled heat sink, the heat sink 12 may include a fan and a heat sink disposed inside the power conversion device 10. The heat sink can contact the first power module 20, and the fan is used to drive airflow through the heat sink to cool the heat sink, thereby achieving cooling of the first power module 20.
[0044] In embodiments where the radiator 12 includes a liquid-cooled radiator, the radiator 12 may include a liquid-cooled plate, one side of which contacts the first power module 20. The liquid-cooled plate forms a cavity, and coolant is disposed within the cavity. The radiator 12 also includes a cooling pump, cooling pipes, and a fan. The cooling pipes are disposed within the cavity, and coolant flows within the cooling pipes. The cooling pump is disposed inside the liquid-cooled plate and connected to the cooling pipes, ensuring that the coolant flows within the cavity in a predetermined direction. The fan is disposed on the side of the cooling pipes away from the first power module 20, which can reduce the temperature of the coolant and ensure the cooling effect of the coolant on the first power module 20.
[0045] When the coolant flows to the portion of the liquid cooling plate that contacts the first power module 20, it absorbs heat from the first power module 20, thus cooling it. The coolant temperature rises after absorbing heat and continues to flow along the cooling pipes away from the first power module 20. When the coolant flows near the fan, the fan lowers the coolant temperature, and the cooled coolant continues to be used to cool the first power module 20.
[0046] The pins of the first power module 20 are soldered onto the circuit board 11, enabling power control and conversion. This application embodiment does not limit the first power module 20; for example, the first power module 20 may include transistors, thyristors, field-effect transistors, etc.
[0047] In some embodiments, a groove 121 is provided on the side of the heat sink 12 near the first power module 20, and a ceramic plate 13 is provided in the groove 121. The side of the first power module 20 near the heat sink 12 is connected (e.g., in contact) to the ceramic plate 13. The heat of the first power module 20 is transferred to the heat sink 12 through the ceramic plate 13, thereby achieving heat dissipation of the first power module 20.
[0048] Please refer to Figure 2 , Figure 3 , Figure 4 and Figure 5 The power conversion device 10 includes a fixing cover 31 for connecting to a circuit board 11. A mounting groove 41 is provided on the side of the fixing cover 31 facing away from the circuit board 11, and a first limiting boss 42a is provided within the mounting groove 41. At least a portion of the first power module 20 is located within the mounting groove 41, and the surface of the first power module 20 facing the circuit board 11 abuts against the first limiting boss 42a.
[0049] The first limiting boss 42a can limit the distance between the first power module 20 and the circuit board 11, thereby limiting the position of the first power module 20 and improving the positional accuracy of the first power module 20. In other words, the first limiting boss 42a can limit the distance between the first power module 20 and the circuit board 11, thereby ensuring the depth to which the pins of the first power module 20 penetrate the circuit board 11, so as to improve the positional accuracy of the first power module 20.
[0050] In some embodiments, the first limiting boss 42a includes a contact plane parallel to the circuit board 11, and the contact plane contacts the first power module 20, thereby preventing the first power module 20 from tilting relative to the circuit board 11 (the pins are not perpendicular to the circuit board 11), so as to prevent the pins from bending due to force.
[0051] The thickness of the first limiting boss 42a (the length of the first limiting boss 42a in the direction perpendicular to the plane of the circuit board 11) is related not only to the distance between the first power module 20 and the circuit board 11, but also to the limit tolerance. The limit tolerance refers to the error of the fixing cover 31, the circuit board 11 and the first power module 20 (e.g., error caused by processing, error caused by wear, etc.).
[0052] The first limiting boss 42a can ensure the normal use of the power conversion device 10 under the limit tolerance, reduce the machining accuracy requirements of the fixed cover 31, and improve the stability of the power conversion device 10.
[0053] Please refer to Figure 6 and Figure 7The power conversion device 10 also includes an elastic element 32, which is disposed within a mounting groove 41. The elastic element 32 is located within a cavity formed by the surface of the fixed cover 31 facing away from the circuit board 11, the first limiting boss 42a, and the surface of the first power module 20 near the fixed cover 31. The first power module 20 is located between the heat sink 12 and the fixed cover 31. The elastic element 32 is fixedly connected to the heat sink 12 and abuts against the first power module 20 in a direction away from the circuit board 11, thereby bringing the first power module 20 into contact with the heat sink 12. The elastic element 32, disposed between the fixed cover 31 and the first power module 20, can compress the first power module 20, ensuring that the pressure exerted by the first power module 20 on the heat sink 12 meets the heat dissipation requirements and guarantees the cooling effect of the first power module 20. For example, the pressure exerted by the first power module 20 on the heat sink 12 is greater than or equal to 15 pounds per square inch (psi), such as 15 psi, 20 psi, 25 psi, etc. The following text will mainly use elastic element 32 as an example for illustration.
[0054] The elastic retaining cover 31 has a mounting groove 41 on the side opposite to the circuit board 11, and a first limiting boss 42a is provided in the mounting groove 41. The first power module 20 is placed in the mounting groove 41 and contacts the first limiting boss 42a. The first limiting boss 42a can limit the height of the first power module 20, thereby limiting the position of the first power module 20 and improving the positional accuracy of the first power module 20 relative to the circuit board 11. The elastic member 32 abuts against the first power module 20 in a direction away from the circuit board 11, so that the first power module 20 is subjected to pressure and pressed against the heat sink 12, thereby ensuring that the pressure of the first power module 20 on the heat sink 12 meets the heat dissipation requirements and ensures the cooling effect of the first power module 20.
[0055] Continue to refer to Figure 5 In some embodiments, the fixing cover 31 is close to the circuit board 11 ( Figure 3 A positioning post 314 is provided on one side of the circuit board 11, and a positioning hole matching the positioning post 314 is provided on the circuit board 11. The positioning post 314 passes through the positioning hole. A locking block 311 is provided on the side wall of the positioning post 314, and a through hole that cooperates with the locking block 311 is provided on the circuit board 11. The locking block 311 can pass through the through hole, and the locking block 311 clamps the circuit board 11 with the fixing cover 31 to install the fixing cover 31 on the circuit board 11.
[0056] The positioning post 314 cooperates with the positioning hole to determine the position of the fixing cover 31 on the circuit board 11. Since the first power module 20 is placed in the mounting groove 41 of the fixing cover 31, the position of the first power module 20 can be determined by the position of the fixing cover 31.
[0057] In the above embodiment, the side wall of the positioning post 314 is provided with an anti-rotation protrusion 312, the anti-rotation protrusion 312 and the locking block 311 are spaced apart, and the circuit board 11 is provided with a recess corresponding to the anti-rotation protrusion 312. The anti-rotation protrusion 312 and the recess cooperate to prevent the fixing cover 31 from rotating relative to the circuit board 11, so as to avoid the fixing cover 31 from detaching from the circuit board 11.
[0058] Continue to refer to Figure 5 In some embodiments, the fixing cover 31 is close to the circuit board 11 ( Figure 3 As shown, a plurality of limiting ribs 313 are provided at intervals along the extension direction of the circuit board 11 on one side. Since the circuit board 11 is prone to deformation during use, the limiting ribs 313 can limit the height of the fixing cover 31 (the distance between the fixing cover and the circuit board), ensuring that the fixing cover 31 and the heat sink 12 (as shown) are properly positioned. Figure 1 (As shown) Parallelism is used to prevent the circuit board 11 from deforming and squeezing the fixed cover 31 when it comes into contact with the fixed cover 31, which would cause the fixed cover 31 to squeeze the elastic element 32 and affect the normal use of the elastic element 32.
[0059] In some implementations, the elastic element 32 is fixedly connected to the fixed cover 31. For example, the elastic element 32 can be glued to the fixed cover 31.
[0060] In some implementations, the elastic element 32 and the fixed cover 31 are detachably connected, which facilitates the installation and replacement of the elastic element 32 and extends the service life of the power conversion device 10.
[0061] In some implementations, the elastic element 32 and the fixed cover 31 can be connected by a bolt structure. For example, the elastic element 32 is provided with a through hole, and the fixed cover 31 is provided with a threaded hole. The bolt passes through the through hole and engages with the threaded hole, thereby connecting the elastic element 32 and the fixed cover 31.
[0062] Continue to refer to Figure 6 In some implementations, the groove wall of the mounting groove 41 is provided with a first stop flange 411 and a second stop flange 412, the first stop flange 411 and the second stop flange 412 are arranged opposite to each other, one end of the elastic member 32 is located between the first stop flange 411 and the bottom of the mounting groove 41, and the other end of the elastic member 32 is located between the second stop flange 412 and the bottom of the mounting groove 41.
[0063] The first stop flange 411 and the second stop flange 412 can restrict the position of the elastic element 32 and prevent the elastic element 32 from moving. At the same time, the first stop flange 411 and the second stop flange 412 are small in size and are integral structural components with the fixing cover 31, which can reduce the processing difficulty of the fixing cover 31 and reduce the volume of the fixing cover 31.
[0064] Please refer to Figure 7 In the above embodiment, the elastic element 32 includes a metal sheet, and the power conversion device 10 also includes an insulating sheet 33, which is located between the elastic element 32 and the first power module 20. The first power module 20 operates at a high temperature, and materials such as plastic and rubber will creep after long-term operation. This reduces the limiting ability of the fixing cover 31 and the elastic element 32 on the first power module 20, and at the same time, reduces the pressure of the elastic element 32 on the first power module 20, resulting in a decrease in the tightness between the first power module 20 and the heat sink 12. Consequently, the heat dissipation capacity of the first power module 20 decreases, making the first power module 20 unusable.
[0065] The elastic element 32, comprising a metal sheet, ensures the long-term effectiveness of the pressure on the first power module 20, facilitating its normal operation. However, since the elastic element 32 is a metal sheet, direct contact with the first power module 20 can affect its insulation performance, potentially leading to overvoltage or overcurrent. The insulating sheet 33 ensures the insulation performance of the first power module 20, guaranteeing its normal operation. This application does not limit the material of the insulating sheet 33; for example, it may include polycarbonate (PC) or polypropylene (PP).
[0066] Continue to refer to Figure 4 and Figure 7 When assembling the first power module 20, the fixing cover 31 is first attached to the circuit board 11. Figure 3 (As shown) Connect; then place the elastic element 32 between the stop flange of the fixed cover 31 and the bottom of the mounting groove 41; then place the insulating sheet 33 at the bottom of the elastic element 32, and then place the first power module 20. The first power module 20 contacts the first limiting boss 42a through the insulating sheet 33, thereby limiting the position of the first power module 20. Solder the first power module 20 to the circuit board 11; finally connect the heat sink 12 to the fixed cover 31, so that the first power module 20 contacts the heat sink 12.
[0067] The elastic element 32 is connected to the heat sink 12 located on the side of the first power module 20 away from the circuit board 11, which can generate a certain pressure on the first power module 20, so that the first power module 20 and the heat sink 12 are in close contact, ensuring the heat dissipation effect of the first power module 20.
[0068] Continue to refer to Figure 7 and Figure 8In the above embodiment, the power conversion device 10 further includes a fastening bolt 34. The bottom of the fastening bolt 34 is provided with an external thread, and the elastic member 32 is provided with a mounting hole 321. The fastening bolt 34 passes through the mounting hole 321 and mates with the threaded hole on the heat sink 12. When the fastening bolt 34 is tightened with the threaded hole on the heat sink 12, the elastic member 32 presses the first power module 20 downward (towards the heat sink 12), so that the first power module 20 is in close contact with the heat sink 12, ensuring the heat dissipation capacity of the first power module 20.
[0069] In the above embodiment, a limiting post 53 is provided on the surface of the elastic member 32 facing away from the circuit board 11, and the mounting hole 321 passes through the limiting post 53. The limiting post 53 is used to abut against the heat sink 12. When the fastening bolt 34 is not tightened, there is a certain gap between the bottom of the limiting post 53 and the heat sink 12. When the fastening bolt 34 is tightened, the limiting post 53 abuts against the heat sink 12, and the bottom of the limiting post 53 directly contacts the heat sink 12. The downward pressure of the fastening bolt 34 on the elastic member 32 is related to the gap. For example, the larger the gap, the greater the pressure of the fastening bolt 34 on the elastic member 32, and thus the greater the pressure of the elastic member 32 on the first power module 20.
[0070] By adjusting the length of the limiting post 53, the pressure of the fastening bolt 34 on the elastic element 32 can be controlled, thereby controlling the pressure of the elastic element 32 on the first power module 20, and further controlling the pressure of the first power module 20 on the heat sink 12. The length of the limiting post 53 can be adjusted according to the actual heat dissipation requirements of the first power module 20.
[0071] Please refer to Figure 8 In the above embodiment, the elastic member 32 includes an abutment portion 51 and a fixing portion 52. The abutment portion 51 is wavy, and its bottom contacts the first power module 20. The abutment portion 51 abuts against the first power module 20, applying downward pressure to the first power module 20. A mounting hole 321 is provided on the fixing portion 52, and a notch 521 is provided on the edge of the fixing portion 52. Since the fastening bolt 34 passes through the mounting hole 321, the pressure of the fastening bolt 34 on the elastic member 32 is concentrated on the fixing portion 52. Since forces are reciprocal, the fixing portion 52, which is under pressure, will generate stress that resists the pressure. The stress concentration in the fixing portion 52 will cause deformation of the fixing portion 52, affecting the normal use of the elastic member 32.
[0072] The edge of the fixing part 52 is provided with a notch 521, which can disperse the stress of the fixing part 52, so that the elastic element 32 is subjected to force more evenly, and avoid the elastic element 32 from deforming, which would affect the normal use of the elastic element 32.
[0073] Continue to refer to Figure 6 and Figure 8In some implementations, the power conversion device 10 further includes a second power module 21, which is located between the heat sink 12 and the fixing cover 31. A second limiting boss 42b is provided in the mounting groove 41. At least a portion of the second power module 21 is located in the mounting groove 41, and the surface of the second power module 21 facing the circuit board 11 abuts against the second limiting boss 42b.
[0074] The first power module 20 abuts against the first limiting boss 42a, and the second power module 21 abuts against the second limiting boss 42b, which determines the positions of the first power module 20 and the second power module 21. The first limiting boss 42a and the second limiting boss 42b are spaced apart, so that there is a certain distance between the first power module 20 and the second power module 21, which can avoid mutual interference between the first power module 20 and the second power module 21 and improve the stability of the first power module 20 and the second power module 21.
[0075] The elastic member 32 includes a first abutting part 51a and a second abutting part 51b. The first abutting part 51a is used to abut against the first power module 20, and the second abutting part 51b is used to abut against the second power module 21, so that the first power module 20 and the second power module 21 are subjected to pressure and make close contact with the heat sink 12, thereby ensuring the heat dissipation effect of the first power module 20 and the second power module 21.
[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of this application, and are not intended to limit them; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A power conversion device, characterized in that, include: Circuit board; The first power module is soldered onto the circuit board; A heat sink is disposed on the side of the first power module away from the circuit board; A fixed cover is fixedly connected to a circuit board. The first power module is located between the heat sink and the fixed cover. The fixed cover has a mounting groove on the side facing away from the circuit board, and a first limiting boss is provided in the mounting groove. At least a portion of the first power module is located in the mounting groove, and the surface of the first power module facing the circuit board abuts against the first limiting boss. An elastic element is disposed in the mounting groove. The elastic element is disposed in the cavity formed by the surface of the fixed cover away from the circuit board, the first limiting boss and the surface of the first power module near the fixed cover. The elastic element is fixedly connected to the heat sink and abuts against the first power module in a direction away from the circuit board so that the first power module contacts the heat sink.
2. The power conversion device according to claim 1, characterized in that, The elastic element is detachably connected to the fixed cover.
3. The power conversion device according to claim 2, characterized in that, The mounting groove has a first stop flange and a second stop flange on its groove wall. The first stop flange and the second stop flange are arranged opposite to each other. One end of the elastic member is located between the first stop flange and the bottom of the mounting groove, and the other end of the elastic member is located between the second stop flange and the bottom of the mounting groove.
4. The power conversion device according to any one of claims 1-3, characterized in that, The elastic element includes a metal sheet; The power conversion device further includes an insulating sheet located between the elastic element and the first power module.
5. The power conversion device according to claim 1, characterized in that, The power conversion device also includes a fastening bolt, and the elastic element is provided with a mounting hole. The fastening bolt passes through the mounting hole and engages with the threaded hole on the radiator.
6. The power conversion device according to claim 5, characterized in that, The elastic element has a limiting post on its surface away from the circuit board, the mounting hole passes through the limiting post, and the limiting post is used to abut against the heat sink.
7. The power conversion device according to claim 5 or 6, characterized in that, The elastic element includes an abutting part and a fixing part. The abutting part is used to abut against the first power module. The mounting hole is provided on the fixing part, and the edge of the fixing part is provided with a notch.
8. The power conversion device according to claim 1, characterized in that, The power conversion device further includes a second power module, which is located between the heat sink and the fixed cover. A second limiting boss is provided in the mounting groove. At least a portion of the second power module is located in the mounting groove, and the surface of the second power module facing the circuit board abuts against the second limiting boss. The elastic element includes a first abutting part and a second abutting part, the first abutting part being used to abut against the first power module, and the second abutting part being used to abut against the second power module.
9. The power conversion device according to claim 1, characterized in that, A positioning post is provided on the side of the fixed cover near the circuit board, and a positioning hole matching the positioning post is provided on the circuit board, with the positioning post passing through the positioning hole.
10. The power conversion device according to claim 9, characterized in that, The positioning post has an anti-rotation protrusion on its side wall, and the circuit board has a recess corresponding to the anti-rotation protrusion. The anti-rotation protrusion and the recess cooperate to prevent the fixing cover from rotating relative to the circuit board.