Power conversion device
Patent Information
- Application Number
- CN202510326570.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-18
- Publication Date
- 2026-09-22
AI Technical Summary
[0003]然而，由于功率板的插接器件(如电容、电感等)集中于功率板T面，而连接离网板的马鞍端子位于功率板B面，传统波峰焊工艺无法同步完成两面焊接，因此除了对功率板T面的插接器件进行波峰焊之外，还需采用选择性波峰焊单独焊接马鞍端子
[0022]本申请通过上述第三部分和第四部分的设置，连接线的一端能够通过第一导电端子与第一电路板电连接，连接线的另一端能够通过第二导电端子和第二固定结构与第二电路板的线路电连接，如此，可以实现第一电路板和第二电路板的电气连接。第四部分设置于第二导电端子和第二电路板之间，能够对第二电路板背离第一电路板的表面进行有效利用，且能够便于连接线与第二电路板进行接线(第二电路板背离第一电路板的表面外露，将第二导电端子和第二固定结构的第四部分设置在第二电路板背离第一电路板的一侧更便于接线)。
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Figure CN122800947A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of photovoltaic technology, and in particular to a power conversion device. Background Technology
[0002] As a core component of photovoltaic power generation systems, the power density and reliability of photovoltaic inverters are crucial to system performance. To meet high power density requirements, the current mainstream solution adopts an inverted mounting design: the power board's T-side (the side with the plug-in devices) is fixed downwards inside the device housing, while the off-grid board is positioned with its T-side upwards above the power board's B-side (the side opposite to the T-side). The power board's B-side and the off-grid board's T-side are electrically connected via cables. This layout allows the power board's T-side to face the device housing, facilitating heat dissipation while reducing cable length and parasitic losses, significantly improving power output per unit volume, and meeting the dual requirements of compactness and efficient heat dissipation.
[0003] However, since the power board's connectors (such as capacitors and inductors) are concentrated on the T-side of the power board, while the saddle terminals connecting to the off-grid board are located on the B-side, traditional wave soldering cannot simultaneously complete the soldering of both sides. Therefore, in addition to wave soldering the connectors on the T-side of the power board, selective wave soldering is required to separately solder the saddle terminals. When selectively soldering the saddle terminals separately, the pins of the saddle terminals need to be soldered from the T-side of the power board into the through-holes. Therefore, during the soldering operation, it is necessary to avoid spatial interference between multiple pins and the connectors on the T-side of the power board. This forces the power board to reserve a larger clearance area on the T-side, weakening the high-density advantage of photovoltaic inverters. Summary of the Invention
[0004] This application provides a power conversion device. The purpose is to improve the power density of the power conversion device.
[0005] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:
[0006] On one hand, this application provides a power conversion device. The power conversion device includes a device housing, electronic components, connecting wires, a first circuit board, and a first power device electrically connected to the first circuit board. The first power device is used to convert direct current from a photovoltaic module or an energy storage battery into alternating current. The electronic components and the first circuit board are both fixed inside the device housing. One end of the connecting wire is electrically connected to the electronic components, and the other end of the connecting wire has a first conductive terminal. The power conversion device also includes a first fixing structure and a first connector. The first circuit board has a first through hole, and at least a portion of the first fixing structure is fixed inside the first through hole.
[0007] The first connector has a first head and a first rod connected to the first head. The first head protrudes radially outward from the first rod along the first through hole. The first conductive terminal is located on one side of the first fixing structure in the thickness direction of the first circuit board. The first head and the first conductive terminal abut against the surface of the first circuit board away from each other. The first rod passes through the first conductive terminal and extends into the first fixing structure located in the first through hole, and the first rod is fixedly connected to the first fixing structure. The first conductive terminal is electrically connected to the first circuit board.
[0008] This application, through the aforementioned configuration, enables the first conductive terminal of the connecting wire to be fixed relative to the first circuit board, facilitating the electrical connection between the first conductive terminal and the first circuit board. Combined with the electrical connection of the other end of the connecting wire to electronic components, this allows for the electrical connection between the electronic components and the first circuit board. Furthermore, since at least a portion of the first fixing structure is fixed within the first through hole, and the first rod can extend into the first fixing structure located within the first through hole, the radial dimension of the portion of the first fixing structure within the first through hole is relatively large (at least larger than the radial dimension of the first rod). Therefore, when fixing the first fixing structure to the first circuit board, fixing at least a portion of the first fixing structure within the first through hole of the first circuit board is sufficient to meet the fixing strength requirements. Thus, this application does not require multiple pins for fixing to the circuit board, unlike saddle terminals. Based on this, when the first fixing structure of this application is fixed to the first circuit board by welding, compared with the multi-pin saddle terminal, since this application does not use a multi-pin setting, there is no need to reserve a large clearance space on the first circuit board in order to facilitate the multi-pin welding process. Therefore, this application can reduce the distance between the first fixing structure and other electronic components on the first circuit board, which is beneficial to improving the power density of the power conversion device.
[0009] In one embodiment of this application, the electronic component and the first conductive terminal are located on the same side of the first circuit board, and the first power device is fixed on the side of the first circuit board away from the first conductive terminal.
[0010] This application places the electronic components and the first conductive terminal on the same side of the first circuit board, and places the first power device on the other side of the first circuit board. In this way, when realizing the electrical connection between the first circuit board and the electronic components, the cable length of the connecting line can be reduced, signal loss can be reduced, and a compact layout of the power conversion device can be achieved.
[0011] In one embodiment of this application, the first fixing structure includes a first part and a second part fixedly connected; the first part is fixed inside a first through hole, and the second part is located outside the first through hole and protrudes radially outward from the first part. The second part is located on the side of the first circuit board away from the first conductive terminal, and the surface of the second part facing the first circuit board is in contact with the first circuit board; the first conductive terminal is electrically connected to the circuit of the first circuit board; or, the second part is located between the first circuit board and the first conductive terminal, and the surface of the second part facing the first circuit board is in contact with the first circuit board; the first conductive terminal is electrically connected to the second part, and the second part is electrically connected to the circuit of the first circuit board.
[0012] That is, when the first fixing structure of this application includes a first part and a second part that are fixedly connected, the first part is fixed in the first through hole, and the second part can be disposed on the side of the first circuit board away from the first conductive terminal, or the second part can be disposed between the first circuit board and the first conductive terminal. The second part, through these two disposal methods, can improve the positional selectivity of the second part and increase the flexibility of the positional setting of the first fixing structure, so that the power conversion device can be applied to various application scenarios. Furthermore, when the second part can be disposed on the side of the first circuit board away from the first conductive terminal, on the one hand, when the connecting line is subjected to a tensile force including a component force along the direction from the second part towards the first part, the second part can maintain tight contact with the first circuit board under the action of this tensile force, ensuring that the first fixing structure and the first circuit board still maintain high connection reliability; on the other hand, if the plug-in device on the first circuit board is located on the side of the first circuit board away from the first conductive terminal, then the first fixing structure and the plug-in device on the first circuit board will be located on the same side of the first circuit board. The first fixing structure and the plug-in device on the first circuit board can be fixed by a single wave soldering, which can simplify the process flow and process complexity, and improve manufacturing efficiency.
[0013] In one embodiment of this application, the first fixing structure has a first through hole and a first threaded hole communicating with the first through hole. The arrangement direction of the first through hole and the first threaded hole is the same as the thickness direction of the first circuit board, and the inner diameter of the first through hole is larger than the minor diameter of the first threaded hole. The first through hole is located between the first threaded hole and the first conductive terminal; the outer wall of the first rod has an external thread, and the first rod passes through the first conductive terminal and the first through hole in sequence, and is threadedly connected to the first threaded hole through the external thread.
[0014] This application provides a first threaded hole and a first unthreaded through hole, with the first through hole located between the first conductive terminal and the first threaded hole. The inner diameter of the first through hole is larger than the minor diameter of the first threaded hole. Thus, when the first rod of the first connector passes sequentially through the first conductive terminal and the first through hole, and is threadedly connected to the first threaded hole via the external thread on the outer wall of the first rod, the first connector can be a standard screw. Since the shank of a standard screw typically has no thread near the head, the structure described above perfectly matches this, facilitating the selection of the first connector and improving the compatibility between the first fixing structure and the first connector.
[0015] In one embodiment of this application, the portion of the first fixing structure located inside the first through hole is welded to the inner wall of the first through hole by solder; the outer wall of the portion of the first fixing structure located inside the first through hole has a first texture; the solder is located between the first texture and the inner wall of the first through hole.
[0016] This application achieves the fixation of the first fixing structure and the first circuit board by soldering the first fixing structure to the first circuit board, thereby improving the connection reliability of the first fixing structure and the first circuit board. By providing a first texture on the outer wall of the portion of the first fixing structure located inside the first through hole, when the portion of the first fixing structure located inside the first through hole is fixed to the inner wall of the first through hole by solder, the presence of the first texture can improve the adhesion strength between the solder and the first fixing structure, thereby improving the soldering reliability.
[0017] In one embodiment of this application, the electronic component is a second circuit board. The second circuit board and the first circuit board are arranged along the thickness direction of the first circuit board, and there is a spacer between the second circuit board and the first circuit board.
[0018] This application incorporates electronic components as a second circuit board, allowing the first circuit board to be electrically connected to the second circuit board. By installing an isolation frame between the first and second circuit boards, signal interference between them can be reduced, thereby improving the operational reliability of the power conversion device.
[0019] In one embodiment of this application, the end of the connecting wire away from the first conductive terminal has a second conductive terminal; the power conversion device further includes a second fixing structure and a second connector, the second circuit board has a second through hole, at least a portion of the second fixing structure is fixed in the second through hole; the second connector has a second head and a second rod connected to the second head, the second head protrudes radially outward from the second rod along the second through hole, the second conductive terminal is located on one side of the second fixing structure in the thickness direction of the second circuit board; the second head abuts against the surface of the second conductive terminal away from the second circuit board, the second rod extends through the second conductive terminal into the second fixing structure located in the second through hole, and the second rod is fixedly connected to the second fixing structure, and the second conductive terminal is electrically connected to the second circuit board.
[0020] Through the aforementioned configuration, similar to the first conductive terminal and the first circuit board, this application enables the second conductive terminal of the connecting wire to be fixed relative to the second circuit board, facilitating the electrical connection between the second conductive terminal and the second circuit board, thereby achieving the electrical connection between the first circuit board and the second circuit board. Furthermore, since at least a portion of the second fixing structure is fixed within the second through hole, and the second rod can extend into the second fixing structure located within the second through hole, the radial dimension of the portion of the second fixing structure within the second through hole is relatively large (at least larger than the radial dimension of the second rod). Therefore, when fixing the second fixing structure and the second circuit board, fixing at least a portion of the second fixing structure within the second through hole of the second circuit board is sufficient to meet the fixing strength requirements, eliminating the need for multi-pin fixing as with saddle terminals. Thus, when the second fixing structure of this application is fixed to the second circuit board using welding, compared to multi-pin saddle terminals, since this application does not employ a multi-pin configuration, there is no need to reserve a large clearance space on the second circuit board to facilitate multi-pin welding processes. Therefore, this application can reduce the distance between the second fixing structure and other electronic components on the second circuit board, which is beneficial for the compactness of the power conversion device and the improvement of power density.
[0021] In one embodiment of this application, the second fixing structure includes a third part and a fourth part that are fixedly connected; the third part is fixed inside the second through hole, and the fourth part is located outside the second through hole and protrudes outward from the third part along the radial direction of the second through hole; the fourth part is located between the second circuit board and the second conductive terminal, and the surface of the fourth part facing the second circuit board is in contact with the second circuit board; the second conductive terminal is electrically connected to the fourth part, and the fourth part is electrically connected to the lines of the second circuit board.
[0022] Through the aforementioned third and fourth parts, one end of the connecting wire can be electrically connected to the first circuit board via the first conductive terminal, and the other end of the connecting wire can be electrically connected to the circuitry of the second circuit board via the second conductive terminal and the second fixing structure. This achieves an electrical connection between the first and second circuit boards. The fourth part, located between the second conductive terminal and the second circuit board, effectively utilizes the surface of the second circuit board facing away from the first circuit board and facilitates wiring between the connecting wire and the second circuit board (since the surface of the second circuit board facing away from the first circuit board is exposed, placing the fourth part of the second conductive terminal and the second fixing structure on the side of the second circuit board facing away from the first circuit board makes wiring easier). Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the structure of a photovoltaic system provided in an embodiment of this application;
[0024] Figure 2 This is one of the structural schematic diagrams of the power conversion device provided in the embodiments of this application;
[0025] Figure 3 This is a second schematic diagram of the power conversion device provided in the embodiments of this application;
[0026] Figure 4 This is a schematic diagram of the first fixing structure provided in an embodiment of this application;
[0027] Figure 5 for Figure 4 A sectional view of the first fixed structure in the middle;
[0028] Figure 6 for Figure 4 Top view of the first fixed structure in the middle;
[0029] Figure 7 This is the third schematic diagram of the power conversion device provided in the embodiments of this application;
[0030] Figure 8 Fourth schematic diagram of the power conversion device provided in the embodiments of this application;
[0031] Figure 9 Fifth schematic diagram of the power conversion device provided in the embodiments of this application;
[0032] Figure 10 Sixth schematic diagram of the power conversion device provided in the embodiments of this application;
[0033] Figure 11 This is the seventh schematic diagram of the power conversion device provided in the embodiments of this application.
[0034] Figure label:
[0035] 01-Photovoltaic system; 100-Power conversion device; 100A-Photovoltaic inverter; 100B-Energy storage converter; 200-Photovoltaic module; 300-Transformer; 410-Energy storage battery; 420-Grid; 430-Load;
[0036] 10 - Electronic component; 11 - Electronic parts; 12 - Second circuit board; 121 - Second through hole;
[0037] 20 - Connecting wire; 21 - First conductive terminal; 22 - Second conductive terminal;
[0038] 30 - First circuit board; 31 - First power device; 32 - First through hole;
[0039] 40 - First fixing structure; 41 - First part; 42 - Second part; 43 - First through hole; 44 - First threaded hole;
[0040] 50 - First connector; 51 - First head; 52 - First rod;
[0041] 60-Isolation rack;
[0042] 70 - Second fixed structure; 71 - Third part; 72 - Fourth part;
[0043] 80 - Second connector; 81 - Second head; 82 - Second rod;
[0044] 90 - Device casing. Detailed Implementation
[0045] 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.
[0046] Figure 1An exemplary photovoltaic system 01 including a power conversion device 100 is shown. For example, the photovoltaic system 01 provided in this application embodiment is based on solar photovoltaic power generation and is suitable for supplying power to various types of electrical equipment such as energy storage batteries 410, the power grid 420, or loads 430. The load 430 can be, but is not limited to, electronic devices using AC power such as motors, fans, or air conditioners. The photovoltaic system 01 includes photovoltaic modules 200, a power conversion device 100 (such as a photovoltaic inverter 100A and an energy storage converter 100B), and a transformer 300. The photovoltaic modules 200 convert solar energy into DC power, which is then converted into AC power by the photovoltaic inverter 100A and further converted by the transformer 300 through step-up or step-down transformation before being supplied to the load 430 or fed into the power grid 420. When there is a surplus of photovoltaic power generation, the energy storage converter 100B stores the excess electrical energy in the energy storage battery 410. When there is insufficient sunlight or a surge in demand from the load 430, the energy storage battery 410 releases electrical energy through the energy storage converter 100B. This energy, together with the electrical energy output from the photovoltaic inverter 100A, is then fed to the load 430 or fed into the grid 420 after the voltage level is adjusted by the transformer 300.
[0047] In some embodiments of the power conversion device 100, multi-pin saddle terminals are mostly used to achieve electrical connection between the circuit board and the electronic component 10 (which can be a circuit board or an electronic component). If the multi-pin saddle terminals are fixed by soldering, a large clearance space needs to be reserved on the circuit board to avoid device interference. This will affect the power density of the power conversion device 100. Therefore, this application proposes a new power conversion device 100 that can improve the power density of the power conversion device 100 while meeting electrical connection requirements.
[0048] The specific structure of the power conversion device 100 provided in this application will be described in detail below.
[0049] Figure 2 This is one of the structural schematic diagrams of the power conversion device provided in the embodiments of this application. Figure 3 This is a second schematic diagram of the power conversion device 100 provided in the embodiments of this application. Please refer to the attached diagram. Figure 2 and Figure 3 The power conversion device 100 includes a device housing 90, electronic components 10, connecting wires 20, a first circuit board 30, and a first power device 31 electrically connected to the first circuit board 30. The first power device 31 is used to convert direct current from photovoltaic modules or energy storage batteries into alternating current. Both the electronic components 10 and the first circuit board 30 are fixed inside the device housing 90. One end of the connecting wire 20 is electrically connected to the electronic components 10, and the other end of the connecting wire 20 has a first conductive terminal 21.
[0050] For example, the device housing 90 has a receiving cavity, in which the electronic component 10, the connecting line 20, the first circuit board 30 and the first power device 31 are all disposed. One end of the connecting line 20 is electrically connected to the electronic component 10, and the other end of the connecting line 20 is electrically connected to the first circuit board 30 through the first conductive terminal 21.
[0051] This application does not limit the specific type of electronic component 10. For example, electronic component 10 can be a circuit board or an electronic component.
[0052] The connecting wire 20 can be used to electrically connect the first circuit board 30 to another circuit board, to connect the first circuit board 30 to electronic components, and to electrically connect the first circuit board 30 to electronic components on another circuit board.
[0053] For example, such as Figure 3 As shown, the power conversion device 100 of this application also includes a first fixing structure 40 and a first connector 50. The first circuit board 30 has a first through hole 32, and at least a portion of the first fixing structure 40 is fixed in the first through hole 32.
[0054] In some examples, the entire first fixing structure 40 is located within the first through hole 32. In other examples, a portion of the first fixing structure 40 is located within the first through hole 32, while another portion is located outside the first through hole 32. For example, another portion of the first fixing structure 40 may be located above or below the first circuit board 30.
[0055] The first conductive terminal 21 of this application is electrically connected to the first circuit board 30. In this way, one end of the connecting line 20 is connected to the electronic component 10, and the other end of the connecting line 20 is electrically connected to the first circuit board 30 through the first conductive terminal 21, thereby realizing the electrical connection between the electronic component 10 and the first circuit board 30.
[0056] The first conductive terminal 21 is electrically connected to the first circuit board 30. This connection can be either a direct electrical connection, such as a line contact between the first conductive terminal 21 and the first circuit board 30, or an indirect electrical connection, such as an indirect electrical connection between the first conductive terminal 21 and the first circuit board 30, such as an indirect electrical connection via an intermediate component.
[0057] In addition, the first connector 50 of this application has a first head 51 and a first rod portion 52 connected to the first head 51. The first head 51 protrudes outward from the first rod portion 52 along the radial direction of the first through hole 32. The first conductive terminal 21 is located on one side of the first fixing structure 40 in the thickness direction of the first circuit board 30.
[0058] In this embodiment, the first conductive terminal 21 is located on one side of the first fixing structure 40 in the thickness direction of the first circuit board 30. In other words, the arrangement direction of the first conductive terminal 21 and the first fixing structure 40 is the same as the thickness direction of the first circuit board 30.
[0059] The first head 51 abuts against the surface of the first conductive terminal 21 away from the first circuit board 30; the first rod 52 passes through the first conductive terminal 21 and extends at least partially into the first fixing structure 40 located in the first through hole 32, and the first rod 52 is fixedly connected to the first fixing structure 40.
[0060] That is, the first head 51 of the first connector 50 of this application can abut against the first conductive terminal 21, and the first rod portion 52 of the first connector 50 can pass through the first conductive terminal 21 and be fixedly connected to the first fixing structure 40. In this way, by screwing the first connector 50 into the first fixing structure 40, the first rod portion 52 of the first connector 50 can be fixed inside the first fixing structure 40, and the first head 51 of the first connector 50 can fix the first conductive terminal 21 between the first circuit board 30 and the first head 51, preventing the first conductive terminal 21 from displacing along the thickness direction of the first circuit board 30, thereby facilitating the electrical connection between the first conductive terminal 21 and the first circuit board 30.
[0061] Furthermore, since at least a portion of the first rod 52 extends into the first fixing structure 40 located within the first through hole 32 when the first rod 52 is fixedly connected to the first fixing structure 40, this means that the radial dimension of the portion of the first fixing structure 40 located within the first through hole 32 is relatively large (the radial dimension of the first fixing structure 40 along the first through hole 32 is at least larger than the radial dimension of the first rod 52 along the first through hole 32). Therefore, when the first fixing structure 40 and the first circuit board 30 are fixed, fixing at least a portion of the first fixing structure 40 within the first through hole 32 of the first circuit board 30 is sufficient to meet the fixing strength requirements of the first fixing structure 40 and the first circuit board 30. Based on this, this application does not require multiple pins to achieve fixing to the circuit board, unlike saddle terminals. Thus, when the first fixing structure 40 and the first circuit board 30 of this application are fixed by welding, since this application does not use a multi-pin configuration compared to a multi-pin saddle terminal, there is no need to reserve a large clearance space on the first circuit board 30 in order to facilitate the multi-pin welding process. Therefore, this application can reduce the distance between the first fixing structure 40 and other electronic components on the first circuit board 30, which is beneficial to improving the power density of the power conversion device 100.
[0062] For example, the first conductive terminal 21 has a through hole. When the first rod portion 52 passes through the first conductive terminal 21 and is fixedly connected to the first fixing structure 40, the first rod portion 52 can pass through the through hole. For example, the first conductive terminal 21 is an OT terminal (also called a circular cold-pressed terminal). The head of the OT terminal is a circular sheet structure, and the tail of the OT terminal is connected to a cylindrical connecting wire 20. It has an OT shape in appearance and is therefore called an OT terminal.
[0063] Please refer to the reference. Figure 2 and Figure 3 As shown, in one embodiment of this application, the electronic component 10 and the first conductive terminal 21 are located on the same side of the first circuit board 30, and the first power device 31 is fixed on the side of the first circuit board 30 away from the first conductive terminal 21.
[0064] This application places the electronic component 10 and the first conductive terminal 21 on the same side of the first circuit board 30, and places the first power device 31 on the other side of the first circuit board 30 (i.e., on the side of the first circuit board 30 away from the electronic component 10 and the first conductive terminal 21). In this way, when realizing the electrical connection between the first circuit board 30 and the electronic component 10, the cable length of the connecting line 20 can be reduced, signal loss can be reduced, and a compact layout of the power conversion device 100 can be achieved.
[0065] Furthermore, the fact that the electronic component 10 and the first conductive terminal 21 are located on the same side of the first circuit board 30 is merely one example of this application and is not a limitation on the position of the electronic component 10. For example, in some embodiments, the electronic component 10 may also be arranged side by side with the first circuit board 30.
[0066] Figure 4 This is a schematic diagram of the first fixing structure 40 provided in an embodiment of this application. Figure 5 for Figure 4 A cross-sectional view of the first fixed structure 40. Figure 6 for Figure 4 Please refer to the top view of the first fixed structure 40. Figures 4 to 6 In one embodiment of this application, the first fixing structure 40 includes a first part 41 and a second part 42 that are fixedly connected.
[0067] in, Figure 7 This is the third schematic diagram of the power conversion device 100 provided in the embodiments of this application. Figure 8 The fourth schematic diagram of the power conversion device 100 provided in the embodiments of this application is shown below. Figure 7 or Figure 8The first part 41 of the first fixing structure 40 is fixed inside the first through hole 32, and the second part 42 of the first fixing structure 40 is located outside the first through hole 32 and protrudes outward from the first part 41 along the radial direction of the first through hole 32.
[0068] In other words, the first part 41 and the second part 42 of the first fixing structure 40 are fixedly connected, the first part 41 and the second part 42 are arranged along the thickness direction of the first circuit board 30, and the second part 42 of the first fixing structure 40 protrudes outward from the first part 41 along the radial direction of the first through hole 32.
[0069] The second portion 42 protrudes radially outward from the first portion 41 of the first through hole 32, such that the radial dimension of the second portion 42 along the first through hole 32 is larger than the corresponding dimension of the first portion 41. Thus, when the first portion 41 is installed within the first through hole 32 of the first circuit board 30, the side of the second portion 42 closest to the first portion 41 can abut against the surface of the first circuit board 30, facilitating the positioning of the first fixing structure 40. In other words, the arrangement of the second portion 42 reduces the risk of the first portion 41 detaching from the first through hole 32 during the installation of the first fixing structure 40.
[0070] Furthermore, in this application, the specific location of the second part 42 of the first fixing structure 40 is not limited; for example, as... Figure 7 As shown, the second part 42 can be located on the side of the first circuit board 30 opposite to the first conductive terminal 21; for example, as Figure 8 As shown, the second part 42 can also be located between the first conductive terminal 21 and the first circuit board 30. These two cases will be described separately below.
[0071] In the first case, please refer to Figure 7 As shown, the second part 42 is located on the side of the first circuit board 30 away from the first conductive terminal 21, and the surface of the second part 42 facing the first circuit board 30 is in contact with the first circuit board 30; the first conductive terminal 21 is electrically connected to the lines of the first circuit board 30.
[0072] That is, in this case, the second part 42 is located on the side of the first circuit board 30 away from the first conductive terminal 21. At this time, when installing the first fixing structure 40, the first part 41 of the first fixing structure 40 is inserted into the first through hole 32, and the side of the second part 42 close to the first part 41 contacts the surface of the first circuit board 30. During the installation of the first fixing structure 40, the second part 42 can play a limiting role, which facilitates the assembly of the first fixing structure 40 and the first circuit board 30.
[0073] When the first part 41 of the first fixing structure 40 is fixed in the first through hole 32 and the second part 42 is located on the side of the first circuit board 30 away from the first conductive terminal 21, the first conductive terminal 21 can be fixed to the surface of the first circuit board 30 away from the second part 42 by the first connector 50. In this way, one end of the connecting line 20 is electrically connected to the electronic component 10, and the other end of the connecting line 20 is electrically connected to the circuit of the first circuit board 30 through the first conductive terminal 21. An electrical connection can be achieved between the electronic component 10 and the first circuit board 30.
[0074] In this case, the first conductive terminal 21 only needs to serve a fixing function and does not need to be designed for current flow (i.e., the first conductive terminal 21 does not need to be conductive). Of course, it is also possible to set the first conductive terminal 21 as a conductive structure.
[0075] In this configuration, since the second portion 42 is located on the side of the first circuit board 30 away from the first conductive terminal 21, when the connecting line 20 is subjected to an upward pulling force (or a pulling force including at least a component force along the direction of the second portion 42 toward the first portion 41), this pulling force causes the first conductive terminal 21 to move away from the first circuit board 30 along its thickness direction. The first fixing structure 40, driven by the first connector 50, will also be subjected to a force along the thickness direction of the first circuit board 30, moving away from the first circuit board 30. At this time, because the second portion 42 is located on the side of the first circuit board 30 away from the first conductive terminal 21, this pulling force makes the contact between the second portion 42 and the first circuit board 30 tighter, and the mechanical fixation more reliable, thereby ensuring a reliable electrical connection between the first conductive terminal 21 and the first circuit board 30. That is, when the second portion 42 of the first fixing structure 40 is located on the side of the first circuit board 30 away from the first conductive terminal 21, it can maintain a high level of mechanical and electrical connection reliability even when the connecting line 20 is subjected to a pulling force.
[0076] On the other hand, since the second part 42 is located on the side of the first circuit board 30 away from the first conductive terminal 21, if the connector on the first circuit board 30 is located on the side of the first circuit board 30 away from the first conductive terminal 21, then the first fixing structure 40 and the connector on the first circuit board 30 are located on the same side of the first circuit board 30. Thus, in this case, the first fixing structure 40 and the connector on the first circuit board 30 can be fixed by a single wave soldering operation, reducing fixing steps, simplifying the process flow and complexity, lowering production difficulty, and improving manufacturing efficiency.
[0077] In the second case, please refer to Figure 8As shown, the second part 42 is located between the first circuit board 30 and the first conductive terminal 21, and the surface of the second part 42 facing the first circuit board 30 is in contact with the first circuit board 30; the first conductive terminal 21 is electrically connected to the second part 42, and the second part 42 is electrically connected to the lines of the first circuit board 30.
[0078] That is, compared with the first case, in the second case, the second part 42 of the first fixing structure 40 is between the first conductive terminal 21 and the first circuit board 30. In this case, when installing the first fixing structure 40, the first part 41 of the first fixing structure 40 is inserted into the first through hole 32, and the side of the second part 42 close to the first part 41 contacts the surface of the first circuit board 30. During the installation of the first fixing structure 40, the second part 42 can play a limiting role, just like in the first case, to facilitate the assembly of the first fixing structure 40 and the first circuit board 30.
[0079] When the first part 41 of the first fixing structure 40 is fixed in the first through hole 32 and the second part 42 is located between the first circuit board 30 and the first conductive terminal 21, the first conductive terminal 21 can be fixed to the side surface of the second part 42 away from the first circuit board 30 by the first connector 50. In this way, one end of the connecting line 20 is electrically connected to the electronic component 10, and the other end of the connecting line 20 is electrically connected to the first fixing structure 40 through the first conductive terminal 21. The first fixing structure 40 is then electrically connected to the circuit of the first circuit board 30. In this way, an electrical connection can be achieved between the electronic component 10 and the first circuit board 30.
[0080] In this configuration, since the second portion 42 is located between the first circuit board 30 and the first conductive terminal 21, it offers the option of different placement positions, thereby improving the placement flexibility of the power conversion device 100 and enabling it to be suitable for various application scenarios. For example, if an isolation frame needs to be installed above the first circuit board 30, and other circuit boards are placed on the isolation frame, the second portion 42 can be positioned on the side of the first circuit board 30 closer to the first conductive terminal 21, effectively utilizing the height space of the isolation frame.
[0081] Please refer to the reference. Figure 4 , Figure 5 and Figure 7As shown, in one embodiment of this application, the first fixing structure 40 has a first through hole 43 and a first threaded hole 44 communicating with the first through hole 43. The arrangement direction of the first through hole 43 and the first threaded hole 44 is the same as the thickness direction of the first circuit board 30. The inner diameter of the first through hole 43 is larger than the minor diameter of the first threaded hole 44. The first through hole 43 is located between the first threaded hole 44 and the first conductive terminal 21. The outer wall of the first rod portion 52 has external threads. The first rod portion 52 passes through the first conductive terminal 21 and the first through hole 43 in sequence, and is threadedly connected to the first threaded hole 44 through the external threads.
[0082] That is, the first fixing structure 40 has a first through hole 43 and a first threaded hole 44 communicating with the first through hole 43. The first through hole 43 is located between the first threaded hole 44 and the first conductive terminal 21. In this way, when the first rod 52 passes through the first conductive terminal 21 and is threadedly connected to the first fixing structure 40, the first rod 52 will pass through the first conductive terminal 21 and the first through hole 43 in sequence and then be threadedly connected to the first threaded hole 44 in the first fixing structure 40.
[0083] This application provides a first through hole 43 without threads, and positions the first through hole 43 between the first conductive terminal 21 and the first threaded hole 44. In this way, when the first rod portion 52 of the first connector 50 passes through the first conductive terminal 21 and the first through hole 43 in sequence and is threaded into the first threaded hole 44, the first connector 50 can use a standard screw. Since the end of the screw shank near the screw head is usually unthreaded, the first fixing structure 40 of this application can be matched perfectly, which can improve the compatibility between the first fixing structure 40 and the first connector 50 and facilitate the cooperation between the first fixing structure 40 and the first connector 50.
[0084] The depth of the first via 43 (i.e., the dimension of the first via 43 along the thickness direction of the first circuit board 30) can be determined based on the length of the unthreaded section of the screw shank. For example, if the first connector 50 is a screw, the sum of the depth of the first via 43 and the thickness of the first conductive terminal 21 is equal to the length of the unthreaded section of the screw shank.
[0085] Of course, the first fixing structure 40 including the first through hole 43 and the first threaded hole 44 is only an example. If the thickness of the first conductive terminal 21 is equal to the length of the unthreaded section of the screw shank, then the first fixing structure 40 may not have the first through hole 43 and may only include the first threaded hole 44.
[0086] Furthermore, the first through hole 43 can be entirely located within the first portion 41 of the first fixing structure 40; it can also be entirely located within the second portion 42 of the first fixing structure 40; or it can be partially located within the first portion 41 of the first fixing structure 40, while the other portion is located within the second portion 42 of the first fixing structure 40. It should be understood that in Figures 4 to 6 The above is merely one example of the possible locations of the first via 43 and the first threaded hole 44, and is not a limitation on the possible locations of the first via 43 and the first threaded hole 44 in this application. For example, when the second portion 42 of the first fixing structure 40 is disposed between the first conductive terminal 21 and the first circuit board 30, the first via 43 is at least partially located within the second portion 42, and the first threaded hole 44 is at least partially located within the first portion 41.
[0087] In one embodiment of this application, the portion of the first fixing structure 40 located within the first through hole 32 is soldered to the inner wall of the first through hole 32. That is, there is solder between the portion of the first fixing structure 40 located within the first through hole 32 and the first through hole 32 of the first circuit board 30. This application fixes the first fixing structure 40 and the first circuit board 30 by soldering, which improves the connection reliability between the first fixing structure 40 and the first circuit board 30, thereby improving the electrical connection reliability between the first circuit board 30 and the electronic component 10.
[0088] Furthermore, the outer wall of the portion of the first fixing structure 40 located within the first through hole 32 has a first texture; the solder is located between the first texture and the inner wall of the first through hole 32. By providing a first texture on the outer wall of the portion of the first fixing structure 40 located within the first through hole 32, this application improves the adhesion strength between the solder and the first fixing structure 40 when the portion of the first fixing structure 40 located within the first through hole 32 is fixed to the inner wall of the first through hole 32 using solder, thereby enhancing welding reliability.
[0089] The shape of the first texture is not limited in this application. For example, the first texture is a groove recessed into the outer wall of the portion of the first fixing structure 40 located in the first through hole 32. The groove can be curved, for example, the groove can be spirally wound around the outer wall of the portion of the first fixing structure 40 located in the first through hole 32; or, the groove can be a continuous or discontinuous multi-segment line; or, the groove can be irregular in shape.
[0090] Furthermore, in this application, the specific type of electronic component 10 is not limited. For example, it can be an electronic component or a circuit board. The following text will describe the cases where the electronic component 10 is either of these two types.
[0091] In one case, please refer to Figure 3 , Figure 7or Figure 8 Electronic component 10 is an electronic element 11, and connecting line 20 is electrically connected to the pins of electronic element 11. In this case, connecting line 20 can electrically connect the first circuit board 30 and electronic element 11, realizing electrical signal interconnection between electronic element 11 and the first circuit board 30. Simultaneously, due to the arrangement of the first fixing structure 40 in this application, when electronic element 11 is electrically connected to the first circuit board 30, the distance between the first fixing structure 40 and other electronic components 11 on the first circuit board 30 can also be reduced, which is beneficial to improving the power density of the power conversion device 100.
[0092] For example, the electronic component 11 is an inductor, that is, one end of the connecting line 20 is electrically connected to the pin of the inductor, and the other end is electrically connected to the first circuit board 30.
[0093] Figure 9 This is the fifth schematic diagram of the structure of the power conversion device 100 provided in the embodiments of this application. In another case, such as... Figure 9 As shown, the electronic component 10 is a second circuit board 12. The second circuit board 12 and the first circuit board 30 are arranged along the thickness direction of the first circuit board 30, and there is a partition 60 between the second circuit board 12 and the first circuit board 30.
[0094] This application uses the electronic component 10 as the second circuit board 12, so that the first circuit board 30 can be electrically connected to the second circuit board 12. By setting an isolation frame 60 between the first circuit board 30 and the second circuit board 12, the first circuit board 30 and the second circuit board 12 can be isolated, reducing signal interference between the first circuit board 30 and the second circuit board 12 and improving the operational reliability of the power conversion device 100.
[0095] For example, the second circuit board 12 is an off-grid board. Of course, the off-grid board is merely an example and not a limitation on the second circuit board 12.
[0096] Figure 10 This is the sixth schematic diagram of the power conversion device 100 provided in the embodiments of this application. Figure 11 The seventh schematic diagram of the power conversion device 100 provided in the embodiments of this application is shown below. Figure 10 or Figure 11 In one embodiment of this application, the end of the connecting line 20 away from the first conductive terminal 21 has a second conductive terminal 22, which is electrically connected to the second circuit board 12. Thus, one end of the connecting line 20 is electrically connected to the first circuit board 30, and the other end of the connecting line 20 is electrically connected to the second circuit board 12 via the second conductive terminal 22, thereby achieving an electrical connection between the first circuit board 30 and the second circuit board 12.
[0097] The second conductive terminal 22 is electrically connected to the second circuit board 12. This connection can be either a direct electrical connection, such as a line contact between the second conductive terminal 22 and the second circuit board 12, or an indirect electrical connection, such as an indirect electrical connection, such as an indirect electrical connection between the second conductive terminal 22 and the second circuit board 12 via the second fixing structure 70.
[0098] The power conversion device 100 of this application further includes a second fixing structure 70 and a second connector 80. The second circuit board 12 has a second through hole 121, and at least a portion of the second fixing structure 70 is fixed in the second through hole 121.
[0099] In some examples, such as Figure 9 As shown, the second fixing structure 70 is entirely located within the second through hole 121. In this case, the second conductive terminal 22 is directly electrically connected to the second circuit board 12. In other examples, such as... Figure 10 or Figure 11 As shown, a portion of the second fixing structure 70 is located inside the second through hole 121, and another portion of the second fixing structure 70 is located outside the second through hole 121. For example, the other portion of the second fixing structure 70 is located on the side of the second circuit board 12 away from the first circuit board 30. In this case, the second conductive terminal 22 is electrically connected to the second circuit board 12 through the second fixing structure 70.
[0100] Furthermore, the second connector 80 of this application has a second head 81 and a second rod portion 82 connected to the second head 81. The second head 81 protrudes radially outward from the second rod portion 82 along the second through hole 121. The second conductive terminal 22 is located on one side of the second fixing structure 70 in the thickness direction of the second circuit board 12. The second head 81 abuts against the surface of the second conductive terminal 22 away from the second circuit board 12. The second rod portion 82 passes through the second conductive terminal 22 and extends at least partially into the second fixing structure 70 located in the second through hole 121, and is fixedly connected to the second fixing structure 70.
[0101] In this embodiment, the second conductive terminal 22 is located on one side of the second fixing structure 70 in the thickness direction of the second circuit board 12. In other words, the arrangement direction of the second conductive terminal 22 and the second fixing structure 70 is the same as the thickness direction of the second circuit board 12.
[0102] That is, the second head 81 of the second connector 80 of this application can abut against the second conductive terminal 22, and the second rod portion 82 of the second connector 80 can pass through the second conductive terminal 22 and be fixedly connected to the second fixing structure 70. In this way, by screwing the second connector 80 into the second fixing structure 70, the second rod portion 82 of the second connector 80 can be fixed inside the second fixing structure 70, and the second head 81 of the second connector 80 can fix the second conductive terminal 22 between the second circuit board 12 and the second head 81, preventing the second conductive terminal 22 from displacing along the thickness direction of the second circuit board 12, thereby facilitating the electrical connection between the second conductive terminal 22 and the second circuit board 12.
[0103] Furthermore, similar to the first rod 52 mentioned above, where at least a portion extends into the first fixing structure 40 located within the first through hole 32, since at least a portion of the second rod 82 extends into the second fixing structure 70 located within the second through hole 121 when the second rod 82 is fixedly connected to the second fixing structure 70, this means that the portion of the second fixing structure 70 located within the second through hole 121 has a larger radial dimension along the second through hole 121 (the radial dimension of the second fixing structure 70 along the second through hole 121 is at least greater than the radial dimension of the second rod 82 along the second through hole 121). Therefore, when the second fixing structure 70 and the second circuit board 12 are fixed, fixing at least a portion of the second fixing structure 70 within the second through hole 121 of the second circuit board 12 is sufficient to meet the fixing strength requirements of the second fixing structure 70 and the second circuit board 12. Based on this, this application does not require multiple pins to achieve fixing to the circuit board like a saddle terminal. Thus, when the second fixing structure 70 of this application is fixed to the second circuit board 12 by welding, compared with the multi-pin saddle terminal, since this application does not use a multi-pin setting, there is no need to reserve a large clearance space on the second circuit board 12 in order to facilitate the multi-pin welding process. Therefore, this application can reduce the distance between the second fixing structure 70 and other electronic components on the second circuit board 12, which is beneficial to improving the power density of the power conversion device 100.
[0104] For example, the second conductive terminal 22 also has a through hole, through which the second rod portion 82 can pass when it is fixedly connected to the second fixing structure 70. For example, the second conductive terminal 22 is also an OT terminal.
[0105] Please refer to Figure 10 or Figure 11 In one embodiment of this application, the second fixing structure 70 includes a third part 71 and a fourth part 72 that are fixedly connected; the third part 71 is fixed inside the second through hole 121, and the fourth part 72 is located outside the second through hole 121 and protrudes outward from the third part 71 along the radial direction of the second through hole 121.
[0106] That is, the third part 71 of the second fixing structure 70 is fixed inside the second through hole 121, and the fourth part 72, which is fixed to the third part 71, is located outside the second through hole 121, and the fourth part 72 protrudes from the third part 71 radially along the second through hole 121.
[0107] For example, the fourth part 72 is located between the second circuit board 12 and the second conductive terminal 22, and the surface of the fourth part 72 facing the second circuit board 12 is in contact with the second circuit board 12; the second conductive terminal 22 is electrically connected to the fourth part 72, and the fourth part 72 is electrically connected to the lines of the second circuit board 12.
[0108] In this application, the fourth part 72 is disposed between the second circuit board 12 and the second conductive terminal 22, and the fourth part 72 protrudes outward from the third part 71 along the radial direction of the second through hole 121. In this way, the part of the fourth part 72 that protrudes outward from the third part 71 can act as a limiting part to contact the second circuit board 12 (that is, the surface of the fourth part 72 facing the second circuit board 12 contacts the second circuit board 12), which facilitates the positioning and assembly of the second fixing structure 70 and the second circuit board 12.
[0109] In addition, the fourth part 72 is disposed between the second circuit board 12 and the second conductive terminal 22, which allows the surface of the second circuit board 12 facing away from the first circuit board 30 to be utilized, and facilitates the connection of the connecting wire 20 to the second circuit board 12 (since the surface of the second circuit board 12 facing away from the first circuit board 30 is exposed, it is more convenient to connect the second conductive terminal 22 and the fourth part 72 of the second fixing structure 70 to the side of the second circuit board 12 facing away from the first circuit board 30).
[0110] The second conductive terminal 22 is electrically connected to the fourth part 72, and the fourth part 72 is electrically connected to the circuit of the second circuit board 12. In this way, one end of the connecting line 20 is electrically connected to the first circuit board 30 through the first conductive terminal 21, and the other end of the connecting line 20 is electrically connected to the second fixing structure 70 through the second conductive terminal 22. The second fixing structure 70 is electrically connected to the circuit of the second circuit board 12, thus realizing the electrical connection between the first circuit board 30 and the second circuit board 12.
[0111] In one embodiment of this application, the portion of the second fixing structure 70 located inside the second through hole 121 is welded to the inner wall of the second through hole 121 by solder; the outer wall of the portion of the second fixing structure 70 located inside the second through hole 121 has a second texture; the solder is located between the second texture and the inner wall of the second through hole 121.
[0112] That is, the second circuit board 12 and the second fixing structure 70 are fixed by soldering. Fixing the second fixing structure 70 and the second circuit board 12 by soldering can improve the connection reliability of the second fixing structure 70 and the second circuit board 12.
[0113] This application provides a second texture on the outer wall of the portion of the second fixing structure 70 located within the second through hole 121. In this way, when the portion of the second fixing structure 70 located within the second through hole 121 is fixed to the inner wall of the second through hole 121 with solder, the presence of the second texture can improve the adhesion strength of the solder and the second fixing structure 70, thereby improving the welding reliability.
[0114] The shape of the second texture is not limited in this application. For example, the second texture is a groove recessed into the outer wall of the portion of the second fixing structure 70 located within the second through hole 121. For example, the groove is curved; for instance, the groove may be spirally wound around the outer wall of the portion of the second fixing structure 70 located within the second through hole 121; or, the groove may be a continuous or discontinuous multi-segment line; or, the groove may be irregular in shape.
[0115] Similarly to the first fixing structure 40, the second fixing structure 70 of this application, for example, has a second through hole and a second threaded hole communicating with the second through hole. The arrangement direction of the second through hole and the second threaded hole is the same as the thickness direction of the second circuit board 12, and the inner diameter of the second through hole is larger than the minor diameter of the second threaded hole. The second through hole is located between the second threaded hole and the second conductive terminal 22; the outer wall of the second rod portion 82 has external threads, and the second rod portion 82 passes through the second conductive terminal 22 and the second through hole in sequence, and is threadedly connected to the second threaded hole through the external threads of the second rod portion 82.
[0116] The depth of the second through hole is set according to the length of the unthreaded section of the second rod portion 82 of the second connector 80. For example, the sum of the depth of the second through hole and the thickness of the second conductive terminal 22 is equal to the length of the unthreaded section of the second rod portion 82 of the second connector 80.
[0117] like Figure 10 or Figure 11 As shown, for example, at least a portion of the second through hole is located within the fourth portion 72 of the second fixing structure 70, and at least a portion of the second threaded hole is located within the third portion 71 of the second fixing structure 70.
[0118] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples. The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A power conversion device, characterized in that, The device includes a housing, electronic components, connecting wires, a first circuit board, and a first power device electrically connected to the first circuit board. The first power device is used to convert direct current from a photovoltaic module or an energy storage battery into alternating current. The electronic components and the first circuit board are both fixed inside the housing. One end of the connecting wire is electrically connected to the electronic components, and the other end of the connecting wire has a first conductive terminal. The power conversion device further includes a first fixing structure and a first connector, the first circuit board has a first through hole, and at least a portion of the first fixing structure is fixed in the first through hole; The first connector has a first head and a first rod connected to the first head. The first head protrudes radially outward from the first rod along the first through hole. The first conductive terminal is located on one side of the first fixing structure in the thickness direction of the first circuit board. The first head and the first conductive terminal abut against the surface of the first circuit board away from each other. The first rod passes through the first conductive terminal and extends into the first fixing structure located in the first through hole. The first rod is fixedly connected to the first fixing structure. The first conductive terminal is electrically connected to the first circuit board.
2. The power conversion device according to claim 1, characterized in that, The electronic component and the first conductive terminal are located on the same side of the first circuit board, and the first power device is fixed on the side of the first circuit board away from the first conductive terminal.
3. The power conversion device according to claim 1 or 2, characterized in that, The first fixing structure includes a first part and a second part that are fixedly connected; the first part is fixed inside the first through hole, and the second part is located outside the first through hole and protrudes outward from the first part along the radial direction of the first through hole; The second part is located on the side of the first circuit board away from the first conductive terminal, and the surface of the second part facing the first circuit board is in contact with the first circuit board; The first conductive terminal is electrically connected to the circuitry of the first circuit board; Alternatively, the second portion is located between the first circuit board and the first conductive terminal, and the surface of the second portion facing the first circuit board is in contact with the first circuit board. The first conductive terminal is electrically connected to the second part, and the second part is electrically connected to the circuitry of the first circuit board.
4. The power conversion device according to any one of claims 1-3, characterized in that, The first fixing structure has a first through hole and a first threaded hole communicating with the first through hole. The arrangement direction of the first through hole and the first threaded hole is the same as the thickness direction of the first circuit board. The inner diameter of the first through hole is larger than the minor diameter of the first threaded hole. The first via is located between the first threaded hole and the first conductive terminal; The outer wall of the first rod has an external thread, and the first rod passes through the first conductive terminal and the first through hole in sequence, and is threadedly connected to the first threaded hole through the external thread.
5. The power conversion device according to any one of claims 1-4, characterized in that, The portion of the first fixing structure located inside the first through hole is welded to the inner wall of the first through hole by solder; the outer wall of the portion of the first fixing structure located inside the first through hole has a first texture; the solder is located between the first texture and the inner wall of the first through hole.
6. The power conversion device according to any one of claims 1-5, characterized in that, The electronic component is a second circuit board, and the second circuit board and the first circuit board are arranged along the thickness direction of the first circuit board, with a spacer between the second circuit board and the first circuit board.
7. The power conversion device according to claim 6, characterized in that, The end of the connecting line away from the first conductive terminal has a second conductive terminal; The power conversion device further includes a second fixing structure and a second connector, the second circuit board having a second through hole, and at least a portion of the second fixing structure being fixed within the second through hole; The second connector has a second head and a second rod connected to the second head. The second head protrudes radially outward from the second rod along the second through hole. The second conductive terminal is located on one side of the second fixing structure in the thickness direction of the second circuit board. The second head and the second conductive terminal abut against the surface of the second circuit board away from each other. The second rod extends through the second conductive terminal into the second fixing structure located in the second through hole, and the second rod is fixedly connected to the second fixing structure. The second conductive terminal is electrically connected to the second circuit board.
8. The power conversion device according to claim 7, characterized in that, The second fixing structure includes a third part and a fourth part that are fixedly connected; the third part is fixed inside the second through hole, and the fourth part is located outside the second through hole and protrudes outward from the third part along the radial direction of the second through hole; The fourth part is located between the second circuit board and the second conductive terminal, and the surface of the fourth part facing the second circuit board is in contact with the second circuit board; the second conductive terminal is electrically connected to the fourth part, and the fourth part is electrically connected to the circuit of the second circuit board.