Power conversion device

Abstract

The invention provides a power conversion device. The first connector of the power conversion device is pre-assembled along with the circuit board, so that cable-free connection between the first connector and the circuit board is realized, the assembly operation difficulty is reduced, and the automatic processing requirement is met. After at least one of the first connector and the second connector penetrates through the installation frame, the first connector and the second connector can be directly connected together in an inserted mode, no switching design exists between the first connector and the second connector, power link switching is reduced, contact resistance is reduced, the first connector and the second connector have higher connection strength and anti-vibration capacity, and the service life of the first connector and the second connector is prolonged. The risk of connection failure is reduced, and the reliability of electric connection is ensured. And meanwhile, the assembly difficulty of the whole machine is greatly reduced, the quick insertion or separation of the second connector and the first connector can be met, the assembly efficiency of the second connector and the first connector is favorably improved, and the repair and maintenance are convenient.

Description

Technical Field

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

[0002] In photovoltaic (PV) systems, the electrical energy from PV modules or energy storage batteries needs to be transmitted to power conversion devices (such as PV inverters and energy storage converters) to invert the current and ultimately deliver the energy to the grid or load. In these power conversion devices, AC connectors are crucial components connecting internal circuit boards and external cables, delivering the inverted electrical energy to the grid or load. To reduce internal cabling in power conversion devices, AC connectors are often directly mounted on the circuit board for connection. However, current on-board AC connectors suffer from numerous electrical transition points and stringent connection process requirements, making it difficult to guarantee the stability of internal and external connections. Summary of the Invention

[0003] This application provides a power conversion device in which a first connector and a second connector can be directly plugged together without any adapter design. This reduces power link transitions, lowers contact resistance, and provides higher connection strength and vibration resistance between the first and second connectors, reducing the risk of connection failure and ensuring the reliability of the electrical connection.

[0004] This application provides a power conversion device, including a housing, a circuit board, a mounting frame, a first connector, and a second connector. The housing houses the circuit board and has a first through hole. The circuit board has a power conversion circuit for converting direct current (DC) from a photovoltaic module or energy storage battery into alternating current (AC), and then supplying the AC power to the power grid or a load. The mounting frame is mounted in the first through hole. The first connector is disposed on the circuit board and electrically connected to it. At least one of the first connector and the second connector passes through the mounting frame. The second connector is inserted into and electrically connected to the first connector. The second connector is used to connect to the power grid or a load.

[0005] In the power conversion device of this application, the first connector is pre-assembled with the circuit board, realizing a cable-free connection between the first connector and the circuit board. This reduces the difficulty of assembly operations, meets the needs of automated processing, and effectively reduces the space occupied inside the enclosure, improving the overall assembly efficiency and the utilization rate of the internal space, which is beneficial to increasing the power density of the power conversion device. After at least one of the first and second connectors passes through the mounting frame, the first and second connectors can be directly plugged together without any adapter design, reducing power link transitions, lowering contact resistance, and giving the first and second connectors higher connection strength and vibration resistance, reducing the risk of connection failure, and ensuring the reliability of the electrical connection. At the same time, it also greatly reduces the assembly difficulty of the entire device, allowing for quick plugging and unplugging of the second connector and the first connector, which is beneficial to improving the assembly efficiency of the second connector and the first connector, facilitating inspection and maintenance. In addition, the quick-plug design of the second connector allows for convenient operation when connecting external cables to the second connector at a relatively convenient height. For example, when the power conversion device is suspended at too high or too low, the serviceability of wiring on the power conversion device is better.

[0006] In one possible implementation, the mounting frame includes a fixing plate and a first protrusion. The fixing plate is connected to the housing, and the first protrusion protrudes from the side of the fixing plate facing the first connector and is inserted into the first connector.

[0007] The first connector mates with the first protrusion, and the mounting frame and the first connector have good alignment, enabling proper positioning of the mounting frame and the first connector. Furthermore, the mounting frame, fixed to the housing, supports the first connector, ensuring the stability of the first connector and the circuit board during installation.

[0008] In one possible implementation, the fixing plate is located outside the housing, the first protrusion passes through the first through hole and is inserted into the first connector, and there is a gap between the sidewall of the first through hole and the first protrusion.

[0009] The first connector is pre-fixed on the circuit board. Due to the existence of tolerances in circuit board processing, housing processing, and assembly, the tolerances of the circuit board, the first connector, and the housing are superimposed. It is difficult to accurately align the first connector on the circuit board with the pre-set corresponding position on the housing (such as the position of the first through hole) every time, resulting in uncertainty in the final position of the first connector. In order to achieve better alignment between the first connector and the mounting frame, there is a gap between the first protrusion and the side wall of the first through hole. That is, the first protrusion can move within the first through hole to adjust the mounting position of the mounting frame on the housing, realizing the floating installation of the mounting frame on the housing. This can absorb the tolerances introduced by component processing and assembly, and ensure the precise mating of the first connector and the second connector.

[0010] In one possible implementation, the fixing plate is provided with a second through hole, and the power conversion device further includes a fastener, which includes a head and a rod. The head is located at one end of the rod and is situated on one side of the fixing plate. The rod passes through the second through hole and is connected to the housing. There is a gap between the sidewall of the second through hole and the rod.

[0011] In other words, the opening area of ​​the second through hole is larger than the size of the outer contour of the rod along its axial direction, and the second through hole provides space for the rod to move. After the rod passes through the second through hole, it can move within the second through hole to adjust the installation position of the rod on the box. After the mounting frame absorbs the tolerance, it can be fixed to the box normally.

[0012] In one possible implementation, the first connector includes a first housing and a first conductive element. The first housing is inserted into a first protrusion, the first conductive element passes through the first housing, one end of the first conductive element is electrically connected to a circuit board, and the other end of the first conductive element is electrically connected to a second connector.

[0013] The first housing provides insulation and protection for the portion of the first conductive component not connected to the circuit board, reducing the impact between the first conductive component and other components inside the housing. Simultaneously, the first housing connects to the first protrusion via a plug-in method, which improves the overall assembly efficiency.

[0014] In one possible implementation, the first housing is provided with a first mounting groove, the opening of the first mounting groove facing the mounting frame side, and the first protrusion is inserted into the first mounting groove.

[0015] A first mounting groove is formed on the first housing, which engages with a first protrusion to connect the first connector and the mounting frame. The first mounting groove reduces the weight of the first housing, while the mounting frame supports the first housing, ensuring the stability of the connection between the first connector and the circuit board.

[0016] In one possible implementation, the first housing further includes a second mounting groove, the opening of which faces the mounting frame, and the second mounting groove accommodates the other end of the first conductive element. The first mounting groove is located on the outer periphery of the second mounting groove. The second connector includes a second conductive element, a portion of which is located within the second mounting groove, and the second conductive element is inserted into and electrically connected to the other end of the first conductive element.

[0017] By providing a second mounting groove on the first housing, the first conductive component and the second conductive component are inserted and mated under the guidance of the second mounting groove to achieve electrical connection between the first and second conductive components. Furthermore, the second conductive component directly plugs into the first conductive component, with no other electrical connection between them, significantly reducing the contact resistance for link conduction. Under high power current, this effectively reduces the temperature rise in the contact area between the first and second conductive components, extending their service life and effectively reducing the possibility of safety hazards.

[0018] In one possible implementation, the second conductive element includes a first elastic sheet, a second elastic sheet, and a connecting portion. The first elastic sheet and the second elastic sheet are opposite to each other and spaced apart. The first elastic sheet is connected to the second elastic sheet via the connecting portion. The connecting portion is used for connection to an external cable, and the other end of the first conductive element abuts between the first elastic sheet and the second elastic sheet.

[0019] When the first conductive element is connected to the second conductive element, the other end of the first conductive element is inserted between the first elastic sheet and the second elastic sheet, and the opposite sides of the first conductive element abut against the first elastic sheet and the second elastic sheet respectively, which increases the contact area between the first conductive element and the second conductive element and ensures the reliability of the electrical connection between the first conductive element and the second conductive element.

[0020] In one possible implementation, the second connector further includes a base for securing a second conductive element of the second connector, a portion of which passes through the mounting frame and plugs into the first connector.

[0021] In one possible implementation, the base includes a seat body, a guide portion, and a third through hole. A portion of the seat body is housed within a mounting frame. The guide portion is located on the side of the seat body facing the first connector and is inserted into a second mounting slot of the first connector. The third through hole extends through the seat body and the guide portion, and accommodates a second conductive element.

[0022] When the second connector is inserted into the first connector, the guide portion, after passing through the mounting frame, extends into the second mounting groove along the side wall of the second mounting groove. Guided by the guide portion and the second mounting groove, the first conductive element can extend into the third through hole and contact the second conductive element, thus achieving electrical connection between the two. Furthermore, the guide portion and the side wall of the second mounting groove provide insulation and protection for the contact point between the first and second conductive elements, preventing the contact point from being exposed and improving the safety of using the first and second connectors.

[0023] In one possible implementation, the second connector further includes a second housing connected to the base body, with a partial gap between the second housing and the base body. The mounting frame also includes a second protrusion disposed between the base body and the second housing.

[0024] A gap is reserved between the base and the second housing. The second protrusion can be inserted into the gap between the base and the second housing, so that the second connector can be connected and fixed to the mounting frame by plugging in, realizing the quick-connect design of the second connector and the mounting frame.

[0025] In one possible implementation, the second connector further includes a magnetic ring disposed within the second housing, located on the side of the second conductive element opposite to the first conductive element, with external wiring passing through the magnetic ring and connecting to the second conductive element. Alternatively, the magnetic ring may be disposed on the outer periphery of at least one of the first and second conductive elements.

[0026] By integrating a magnetic ring into the first or second connector, the influence of internal magnetic interference of the power conversion device on the external power grid and load is blocked, thereby improving the electromagnetic compatibility (EMC) of the power conversion device. When the magnetic ring is located inside the second housing and on the side of the second conductive element opposite to the first conductive element, there is no need to reserve space or design an installation structure on the outer periphery of the second housing opposite the second conductive element, which helps to reduce the size of the second connector. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0028] Figure 1 This is a schematic diagram of the architecture of a photovoltaic energy storage system provided in an embodiment of this application;

[0029] Figure 2 This is a plan view of a power conversion device provided in an embodiment of this application;

[0030] Figure 3 This is a three-dimensional structural schematic diagram of a power conversion device provided in an embodiment of this application;

[0031] Figure 4 This is an exploded view of a power conversion device according to an embodiment of this application;

[0032] Figure 5 for Figure 2 The power conversion device shown is a cross-sectional view along line VV.

[0033] Figure 6 A three-dimensional structural diagram of a mounting frame provided in an embodiment of this application;

[0034] Figure 7 A three-dimensional structural schematic diagram of a first connector provided in an embodiment of this application;

[0035] Figure 8 for Figure 2 A partial cross-sectional view of the power conversion device shown along line VIII-VIII;

[0036] Figure 9 A partial cross-sectional view of a power conversion device provided in an embodiment of this application;

[0037] Figure 10 A three-dimensional structural schematic diagram of a second conductive element provided in an embodiment of this application;

[0038] Figure 11 for Figure 8 An enlarged view of point XI in the power conversion device shown;

[0039] Figure 12 A three-dimensional structural schematic diagram of a base provided in an embodiment of this application;

[0040] Figure 13 An exploded view of the second conductive element, elastic element, and locking element provided in an embodiment of this application;

[0041] Figure 14 This is an exploded view of the mounting frame and the second connector provided in one embodiment of this application.

[0042] Explanation of reference numerals in the attached figures:

[0043] 10-Box body; 11-First through hole; 20-Cover plate; 30-Circuit board; 40-Power device; 50-Mounting frame; 51-Fixing plate; 511-Second through hole; 512-Groove; 52-First protrusion; 53-Second protrusion; 54-Locking block; 60-First connector; 61-First housing; 611-Positioning part; 612-First mounting groove; 613-Second mounting groove; 62-First conductive element; 70-Second connector; 71-Second conductive element; 711-First elastic sheet; 712-Second elastic sheet; 713-Connecting part; 714-Clamping element; 72-Base; 721-Base body; 722-Guide part; 723-Third through hole; 724-Opening; 73-Elastic element; 731-First plate body; 7 32-Second plate; 733-Third plate; 734-First bridging part; 735-Second bridging part; 74-Locking element; 75-Second housing; 751-Receiving cavity; 752-Hinge shaft; 753-Through hole; 76-Magnetic ring; 77-Locking element; 771-Connecting plate; 772-Locking arm; 78-Pressing element; 80-Fastener; 81-Head; 82-Rod; 90-Sealing assembly; 91-First seal; 911-Sealing ring; 912-Lug; 92-Second seal; 93-Third seal; 100-Power conversion device; 200-Photovoltaic module; 300-Energy storage battery; 400-Load; 500-Grid; 600-Grid-connected / off-grid switch; 700-Meter; 800-AC circuit breaker. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0045] Please see Figure 1 , Figure 1 This is a schematic diagram of the architecture of a photovoltaic energy storage system provided in one embodiment of this application. Figure 1 As shown, the photovoltaic module 200 converts solar energy into direct current (DC) through the photovoltaic effect. The photovoltaic module 200 includes multiple cells connected in series or parallel to achieve a certain output power. The power conversion device 100 converts the DC power from the photovoltaic module 200 or the energy storage battery 300 into alternating current (AC) and transmits the AC power to the power grid 500 or the load 400. Specifically, the power conversion device 100 includes DC terminals, AC terminals, a DC switch, and a power conversion circuit. The photovoltaic module 200 and the power conversion circuit are connected via corresponding DC switches, and the energy storage battery 300 and the power conversion circuit are also connected via corresponding DC switches. The power conversion circuit includes both DC / DC and DC / AC circuits. In practical applications, the photovoltaic module 200 / energy storage battery 300 is connected to the DC terminal, and then the DC power is transmitted to the DC / AC circuit through the DC switch. The DC / AC circuit transmits the transformed DC power to the DC / AC circuit. Subsequently, the DC / AC circuit converts the DC power into AC power. The power conversion device 100 is connected to the load 400 or the power grid 500 through the AC terminal, and then the AC power output by the power conversion device 100 is delivered to the load 400 or transmitted to the power grid 500 through the grid-connected switch 600.

[0046] In one embodiment, a meter 700 and an AC circuit breaker 800 are connected between the grid-connected switch 600 and the power grid 500, and the AC circuit breaker 800 is connected between the power conversion device 100 and the load 400. The meter 700 is used to measure the amount of electricity or power at the grid connection point. When the grid-connected switch 600 is closed, the power conversion device 100 can operate in grid-connected mode. The power conversion device 100 can transmit electrical energy to the power grid 500 through the grid-connected switch 600, the meter 700, and the corresponding AC circuit breaker 800, or transmit it to the load 400 through the corresponding AC circuit breaker 800. Specifically, under sufficient sunlight conditions during the day, the DC power generated by the photovoltaic module 200 is converted into AC power by the power conversion device 100 and can be preferentially supplied to the load 400. Excess electrical energy generated by the photovoltaic module 200 is transferred to the energy storage battery 300 for storage via the power conversion device 100. This means the DC power from the energy storage battery 300 is converted to AC power by the power conversion device 100. If the energy storage battery 300 is at full load, it can convert the excess electrical energy generated by the photovoltaic module 200 back to AC power via the power conversion device 100 and feed it into the grid 500. During periods of poor or insufficient sunlight, the energy storage battery 300 releases its stored DC power, which is then converted to AC power by the power conversion device 100 to provide a stable power supply to the load 400. When the grid-connected switch 600 is open, the power conversion device 100 can operate in off-grid mode, converting the DC power from the photovoltaic module 200 back to AC power and distributing the AC power to different loads 400.

[0047] This application provides a power conversion device 100 for converting alternating current (AC) and direct current (DC) into the other. In one embodiment, the power conversion device 100 may be a photovoltaic inverter. In this embodiment, the power conversion device 100 is applied in a photovoltaic system and is used to convert DC power from a photovoltaic module 200 into AC power and transmit the AC power to the power grid 500 or other loads.

[0048] In another embodiment, the power conversion device 100 can be an energy storage converter. In this embodiment, the power conversion device 100 is applied to an energy storage system. The power conversion device 100 is used to convert DC power from the energy storage battery 300 into AC power and deliver the AC power to the power grid 500 or other loads. In addition, the power conversion device 100 can also convert AC power from the power grid 500 into DC power to charge the energy storage battery 300.

[0049] Please see Figure 2 and Figure 3 , Figure 2 This is a plan view of a power conversion device 100 provided in an embodiment of this application. Figure 3 This is a three-dimensional structural schematic diagram of a power conversion device 100 provided in an embodiment of this application. The power conversion device 100 includes a housing 10, a cover plate 20, a circuit board 30, and a power device 40. The housing 10 forms a cavity with an opening. The cover plate 20 covers the opening of the housing 10 and is connected and fixed to the housing 10. The circuit board 30 and the power device 40 are both housed within the space enclosed by the housing 10 and the cover plate 20. The surface of the circuit board 30 faces the cover plate 20. The circuit board 30 can be a printed circuit board (PCB) and has a power conversion circuit. The power device 40 is disposed on the circuit board 30 and electrically connected to it. The power device 40 includes a power module, inductors, capacitors, and other devices. The power module includes a power semiconductor chip, a drive circuit, and a heat dissipation structure. The power semiconductor chip can be an IGBT, a metal-oxide-semiconductor field-effect transistor (MOSFET), a diode, or other devices.

[0050] In one embodiment, the power module, inductor, and capacitor can be disposed on the same surface of the circuit board 30. In another embodiment, at least one of the inductor and capacitor can be disposed on two surfaces opposite to the power module on the circuit board 30, without limitation.

[0051] The power conversion device 100 also includes a mounting frame 50, a first connector 60, and a second connector 70. The housing 10 has a first through hole 11, which connects the interior and exterior of the housing 10. The mounting frame 50 is mounted in the first through hole 11 and fixedly connected to the housing 10. The first connector 60 is disposed on and electrically connected to the circuit board 30. At least one of the first connector 60 and the second connector 70 passes through the mounting frame 50, and the second connector 70 is plugged into and electrically connected to the first connector 60. The second connector 70 is used to connect to the power grid or a load.

[0052] The mounting frame 50, the first connector 60, and the second connector 70 constitute an AC terminal. The external cable connected to the second connector 70 is an AC output line. The AC output line is also connected to the power grid 500 or the load 400. After the power conversion circuit converts DC power to AC power, it transmits the AC power to the power grid 500 or the load 400 through the first connector 60, the second connector 70, and the AC output line.

[0053] In the power conversion device 100 of this application, the first connector 60 is pre-assembled with the circuit board 30, realizing a wireless connection between the first connector 60 and the circuit board 30. This reduces the difficulty of assembly operations, meets the requirements of automated processing, and effectively reduces the space occupied inside the housing 10, improving the overall assembly efficiency and the utilization rate of the internal space of the housing 10, which is beneficial to improving the power density of the power conversion device 100. The wireless design between the first connector 60 and the circuit board 30 greatly shortens the heat conduction path from the first connector 60 to the circuit board 30. After at least one of the first connector 60 and the second connector 70 passes through the mounting frame 50, the first connector 60 and the second connector 70 can be directly plugged together without any adapter design, reducing power link transitions, lowering contact resistance, and giving the first connector and the second connector higher connection strength and vibration resistance, reducing the risk of connection failure, and ensuring the reliability of the electrical connection. At the same time, it greatly reduces the assembly difficulty of the whole machine, and can meet the quick plugging or disconnection of the second connector 70 and the first connector 60. This is conducive to improving the assembly efficiency of the second connector 70 and the first connector 60, and facilitates inspection and maintenance. In addition, the quick plug design of the second connector 70 allows for convenient operation at a more convenient height when connecting external cables to the second connector 70. For example, when the power conversion device 100 is suspended at too high or too low, the serviceability of wiring on the power conversion device 100 is better.

[0054] Please see Figure 4 , Figure 4 This is an exploded structural diagram of a power conversion device 100 provided in one embodiment of this application from another perspective. The mounting frame 50 is made of insulating material to provide insulation protection for the metal conductive parts of the first connector 60 and the second connector 70. In one embodiment, the mounting frame 50 includes a fixing plate 51 and a first protrusion 52. The fixing plate 51 is a flat plate structure and is disposed at the first through hole 11. The fixing plate 51 is connected and fixed to the housing 10. It can be understood that the fixing plate 51 has a through hole, which is disposed opposite to and communicates with the first through hole 11, so that at least one of the first connector 60 and the second connector 70 can be inserted through the through hole.

[0055] The first protrusion 52 and the fixing plate 51 can be integrally formed, such as by injection molding, reducing connection steps and thus improving the overall assembly efficiency of the power conversion device 100. Alternatively, the first protrusion 52 and the fixing plate 51 can be separate structures, connected by snap-fit, welding, or screws. After pre-assembly, the first protrusion 52 and the fixing plate 51 are fixed to the housing 10. The first protrusion 52 is inserted into the first connector 60. This arrangement ensures good alignment between the mounting frame 50 and the first connector 60, allowing for proper positioning. Furthermore, the mounting frame 50 fixed to the housing 10 supports the first connector 60, ensuring the stability of the installation of the first connector 60 and the circuit board 30. Alignment refers to the degree of conformity between the actual position of a structure and its theoretically correct position.

[0056] In one embodiment, the first protrusion 52 is a hollow structure, that is, the first protrusion 52 is a sleeve protruding from the fixing plate 51, the interior of the first protrusion 52 communicates with the first through hole 11, and the first protrusion 52 is disposed on the side of the fixing plate 51 facing the first connector 60. In other embodiments, the first protrusion is a solid columnar structure, and there are at least two first protrusions, which are spaced apart, so that the mounting frame can better position the first connector when it is inserted into the first connector.

[0057] Please combine Figure 5 , Figure 5 for Figure 2The diagram shows a cross-sectional view of the power conversion device 100 along line VV. A fixing plate 51 can be disposed outside the housing 10. In this case, the first protrusion 52 passes through the first through hole 11 and is inserted into the first connector 60. There is a gap between the sidewall of the first through hole 11 and the first protrusion 52. For example, when the first protrusion 52 is a sleeve, the opening area of ​​the first through hole 11 is larger than the size of the orthographic projection of the first protrusion 52 along its axial direction. When assembling the power conversion device 100, the first connector 60 can be pre-fixed on the circuit board 30. Due to the existence of machining tolerances of the circuit board 30, the housing 10, and assembly tolerances, the tolerances of the circuit board 30, the first connector 60, and the housing 10 are superimposed. The pre-set corresponding position (such as the position of the first through hole 11) of the first connector 60 on the circuit board 30 and the housing 10 is difficult to align precisely every time, leading to uncertainty in the final position of the first connector 60. In order to achieve good alignment between the first connector 60 and the mounting frame 50, there is a gap between the first protrusion 52 and the side wall of the first through hole 11. That is, the first protrusion 52 can move within the first through hole 11 to adjust the mounting position of the mounting frame 50 on the housing 10, so that the mounting frame 50 can be floating on the housing 10. This can absorb the tolerances introduced by the processing and assembly of parts and ensure the precise mating of the first connector 60 and the second connector 70.

[0058] like Figure 4 As shown, the fixing plate 51 further includes a second through hole 511, which penetrates both opposite sides of the fixing plate 51. The power conversion device 100 also includes a fastener 80, which includes a head 81 and a rod 82. The head 81 is located at one end of the rod 82 and is situated on one side of the fixing plate 51. The rod 82 passes through the second through hole 511 and is connected to the housing 10. The rod 82 has external threads, and the housing 10 has a threaded hole. After passing through the second through hole 511, the rod 82 engages with the threaded hole on the housing 10 to mount the fixing plate 51 onto the housing 10. The threaded hole can be a through hole or a blind hole, and is not specifically limited.

[0059] There is a gap between the sidewall of the second through hole 511 and the rod 82, that is, the opening area of ​​the second through hole 511 is larger than the size of the outer contour of the rod 82 projected along its axis. In fact, the opening area of ​​the second through hole 511 is also larger than the opening area of ​​the threaded hole. Thus, after the rod 82 moves in the second through hole 511, it can always be aligned with the threaded hole, so that the external thread of the rod 82 can achieve thread engagement with the threaded hole on the housing 10. Since the first connector 60 has been pre-installed in the housing 10 along with the circuit board 30, the position of the circuit board 30 in the housing 10 is relatively fixed. When the fixing plate 51 and the housing 10 are locked by the fastener 80, the first protrusion 52 is passed through the first through hole 11. Since the first protrusion 52 can move in the first through hole 11, the first protrusion 52 is aligned with the insertion position on the first connector 60. After the first protrusion 52 is inserted into the first connector 60, the fastener 80 is passed through the second through hole 511 and aligned with the threaded hole for locking. By opening a second through hole 511 on the fixing plate 51 with an opening area larger than the size of the orthographic projection of the outer contour of the rod 82, the second through hole 511 provides space for the rod 82 to move. After the mounting frame 50 absorbs the tolerance, that is, after the mounting frame 50 is inserted into the first connector 60, the mounting frame 50 can be fixed on the housing 10 normally. In this way, when the second connector 70 is inserted into the first connector 60, the second connector 70 can be accurately inserted into the first connector 60.

[0060] The power conversion device 100 also includes a sealing assembly 90, which includes a first sealing element 91. The first sealing element 91 is disposed between the fixing plate 51 and the housing 10, and is used to seal the connection between the fixing plate 51 and the housing 10. The surface of the fixing plate 51 may be provided with a groove 512, and the first sealing element 91 is fitted into the groove 512. After the fixing plate 51 is connected and fixed to the housing 10, both the fixing plate 51 and the housing 10 press against the first sealing element 91, so that the first sealing element 91 is tightly fitted between the fixing plate 51 and the housing 10, thereby achieving IP protection for the inside and outside of the power conversion device 100.

[0061] Please see Figure 6 , Figure 6 This is a three-dimensional structural diagram of a mounting frame 50 provided in an embodiment of this application. Further, the first sealing element 91 includes a sealing ring 911 and at least two lugs 912. The at least two lugs 912 are disposed on the sealing ring 911, and the extending direction of the at least two lugs 912 is perpendicular to the central axis of the sealing ring 911. The at least two lugs 912 are spaced apart on the outer periphery of the sealing ring 911. When the first sealing element 91 is installed, the at least two lugs 912 can play a positioning role, reducing or eliminating the possibility of the sealing ring 911 twisting within the groove 512, ensuring that the first sealing element 91 can reliably achieve a seal over a long period.

[0062] The mounting frame 50 also includes a second protrusion 53, which is disposed on the side of the fixing plate 51 facing the second connector 70. The second protrusion 53 is inserted into the second connector 70, thus providing support for the second connector 70. The second protrusion 53 has a hollow structure, and its interior communicates with a through hole on the fixing plate 51, so that at least one of the second connector 70 and the first connector 60 can pass through the mounting frame 50 and be inserted together to achieve electrical connection.

[0063] When the fixing plate 51 is set outside the housing 10, the second protrusion 53 is also located outside the housing 10. After the first protrusion 52 is aligned with the first connector 60, the relative position of the first connector 60 and the mounting frame 50 is fixed. The second connector 70 can be quickly inserted into the second protrusion 53 and can be aligned with the first connector 60.

[0064] In other embodiments, the fixing plate 51 can also be disposed inside the housing 10. Since the first protrusion 52 is disposed on the side of the fixing plate 51 facing the first connector 60, and the first protrusion 52 is also disposed inside the housing 10, the second protrusion 53 passes through the first through hole 11 and extends out of the housing 10. During assembly, the mounting frame 50 can be fixed on the housing 10 first, and the pre-assembled circuit board 30 and the first connector 60 can be assembled into the housing 10. At the same time, the first connector 60 is aligned with the first protrusion 52 to achieve insertion. In this case, it is not necessary to open large holes in the fixing plate 51 and the housing 10.

[0065] The second protrusion 53 is a hollow structure, that is, the second protrusion 53 is a sleeve that protrudes relative to the fixed plate 51. Alternatively, the second protrusion is a solid columnar structure, and there are at least two second protrusions, which are spaced apart, so that the mounting frame can better position the second connector when it is inserted into the second connector.

[0066] In one embodiment, the first connector 60 is housed within the housing 10, with a portion of the first connector 60 extending into the mounting frame 50. A portion of the second connector 70 passes through the mounting frame 50 and plugs into the first connector 60 within the mounting frame 50. After the first connector 60 is plugged into the mounting frame 50, there is good alignment between the first connector 60 and the mounting frame 50, ensuring proper positioning of the mounting frame 50 and the first connector 60. Subsequently, when the second connector 70 passes through the mounting frame 50 and plugs into the first connector 60, the second connector 70 and the first connector 60 can be precisely mated.

[0067] In other embodiments, a portion of the first connector 60 is housed within the housing 10, and another portion of the first connector 60 extends through the entire mounting frame 50 and out of the housing 10. The second connector 70 is inserted into the first connector 60 located outside the housing 10. Alternatively, the first connector 60 is housed within the housing 10, and is not connected to the mounting frame 50. The second connector 70 extends through the entire mounting frame 50 to be inserted into the first connector 60 inside the housing 10.

[0068] Please see Figure 5 and Figure 7 , Figure 7 This is a three-dimensional structural diagram of a first connector 60 provided in one embodiment of this application. The first connector 60 includes a first housing 61 and a first conductive element 62. The first housing 61 is inserted into a first protrusion 52. The first conductive element 62 penetrates the first housing 61 and is embedded in the first housing 61. For example, the first conductive element 62 is embedded inside the first housing 61 by an insert injection molding process, with both ends of the first conductive element 62 exposed. This achieves a seal between the first conductive element 62 and the first housing 61, and also facilitates the connection between the first conductive element 62 and the circuit board 30 and the second connector 70. Alternatively, a cavity is formed in the first housing 61 for placing the first conductive element 62, with both ends of the first conductive element 62 exposed. The first conductive element 62 is sealed to the sidewall of the cavity by adhesive dispensing, achieving a seal between the first housing 61 and the first conductive element 62. Specifically, one end of the first conductive element 62 is electrically connected to the circuit board 30, and the connection between the first conductive element 62 and the circuit board 30 is secured by welding, crimping, or screws. The other end of the first conductive element 62 is electrically connected to the second connector 70. This configuration eliminates the cable transitions between the first connector 60, the second connector 70, and the circuit board 30, significantly shortening the heat conduction path. This allows the negative temperature coefficient (NTC) thermistor of the first connector 60 to effectively detect the temperature at the contact points between the first conductive element 62 and the second connector 70, as well as at the contact points between the external cable and the second connector 70. When overheating occurs, an alarm is triggered and the device is shut down. The high accuracy of the NTC detection on the first connector 60 greatly reduces the risk of safety hazards in the power conversion device 100. The first housing 61 provides insulation and protection for the portion of the first conductive element 62 not connected to the circuit board 30, reducing the impact of the first conductive element 62 on other components within the housing 10. Meanwhile, the first housing 61 is connected to the first protrusion 52 by a plug-in method, which helps to improve the assembly efficiency of the whole machine.

[0069] The first housing 61 is made of insulating material to provide insulation protection for the first conductive component 62. A positioning part 611 is provided on the side of the first housing 61 facing the circuit board 30. The positioning part 611 protrudes from the side of the first housing 61 facing the circuit board 30 and is connected to the circuit board 30. For example, the circuit board 30 has an opening 724 corresponding to the positioning part 611. The positioning part 611 engages with the opening 724 on the circuit board 30 to fix the first housing 61.

[0070] Please combine Figure 8 , Figure 8 for Figure 2 The diagram shows a cross-sectional view of the power conversion device 100 along line VIII-VIII. A first mounting groove 612 is formed on the side of the first housing 61 facing the mounting frame 50. The opening of the first mounting groove 612 faces the mounting frame 50. A first protrusion 52 is inserted into the first mounting groove 612. The first mounting groove 612 is located on the outer periphery of the first conductive element 62. After the first mounting groove 612 is inserted into the first protrusion 52, the first conductive element 62 is located inside the first protrusion 52. It can be understood that when the first protrusion 52 is a sleeve, the first mounting groove 612 is an annular groove. When the first protrusion 52 is inserted into the first mounting groove 612, it can fit tightly against the sidewall of the first mounting groove 612, thus allowing the first housing 61 to be securely mounted on the mounting frame 50. By forming the first mounting groove 612 on the first housing 61, and the first mounting groove 612 and the first protrusion 52 being inserted into each other, the connection between the first connector 60 and the mounting frame 50 is achieved. The first mounting slot 612 can reduce the weight of the first housing 61, and the mounting frame 50 supports the first housing 61 to ensure the stability of the connection between the first connector 60 and the circuit board 30.

[0071] The power conversion device 100 also includes a second seal 92, which is disposed between the first protrusion 52 and the first housing 61. Specifically, the second seal 92 is located between the outer peripheral surface of the first protrusion 52 and the side wall of the first mounting groove 612 to achieve a seal between the first protrusion 52 and the first housing 61, thereby achieving IP protection for the inside and outside of the power conversion device 100.

[0072] Please combine Figure 9 , Figure 9This is a partial cross-sectional view of a power conversion device 100 provided in an embodiment of this application. In this application, the first conductive element 62 is embedded in the first housing 61 by an insert injection molding process, eliminating the need for additional sealing elements to seal the first conductive element 62 and the first housing 61. The first housing 61 and the first protrusion 52 are sealed by the second sealing element 92. Thus, after the mounting frame 50 is sealed to the housing 10, for example, after the sealing installation between the fixing plate 51 and the housing 10, and between the fastener 80 and the housing 10, the interior of the housing 10 can be sealed and protected. When the second connector 70 is not inserted, there is no need to additionally provide a sealing cover plate to cover the second protrusion 53 of the mounting frame 50. This simplifies the assembly process when inserting the second connector 70 and improves assembly efficiency.

[0073] The first housing 61 also has a second mounting groove 613, with the opening of the second mounting groove 613 facing the mounting frame 50. The second mounting groove 613 accommodates the other end of the first conductive member 62. The first mounting groove 612 is located on the outer periphery of the second mounting groove 613, and the first mounting groove 612 and the second mounting groove 613 are spaced apart. The second connector 70 also plugs into the second mounting groove 613 to achieve electrical connection between the second connector 70 and the first conductive member 62. Specifically, the second connector 70 includes a second conductive member 71, a portion of which passes through the mounting frame 50 and is located within the second mounting groove 613. By providing the second mounting groove 613 on the first housing 61, the first conductive member 62 and the second conductive member 71 are plugged in and connected under the guidance of the second mounting groove 613, achieving electrical connection between the first conductive member 62 and the second conductive member 71. The second conductive element 71 is directly plugged into the first conductive element 62, with no other electrical connection between them. Compared to the two-to-one plugging of three connectors, this application reduces the number of single-link transitions from two to one, decreasing contact resistance by 50% and significantly reducing the contact resistance required for link conduction. Under high-power current, this effectively reduces the temperature rise in the contact area between the first conductive element 62 and the second conductive element 71, extending their service life and effectively reducing the possibility of safety hazards. Furthermore, the direct plugging of the first conductive element 62 and the second conductive element 71 eliminates the need for contacts within the first protrusion 52 to electrically connect them, reducing the manufacturing cost of the power conversion device 100.

[0074] The number of second mounting slots 613 can be one or more. When there are multiple second mounting slots 613, the multiple second mounting slots 613 are arranged at intervals. Each second mounting slot 613 is provided with a corresponding first conductive element 62. The first mounting slot 612 is located on the outer periphery of the multiple second mounting slots 613.

[0075] The first conductive element 62 is a metal conductive element, such as a copper busbar or an aluminum busbar. One end of the first conductive element 62 protrudes from the first housing 61 so that one end of the first conductive element 62 is connected and fixed to the circuit board 30 to achieve electrical connection. The other end of the first conductive element 62 can be accommodated in the second mounting groove 613 so that the side wall of the second mounting groove 613 can separate the other end of the first conductive element 62 from other devices in the housing 10.

[0076] like Figure 7 As shown, in one embodiment, the first conductive element 62 has an "L"-shaped structure. One end of the first conductive element 62 faces the surface of the circuit board 30, and the other end faces the side plate of the housing 10. The side plate of the housing 10 is perpendicular to the cover plate 20. The mounting frame 50 can be disposed on the side plate of the housing 10, and the second connector 70 passes through the mounting frame 50 from the side of the housing 10 and is inserted into the other end of the first conductive element 62.

[0077] In other embodiments, the first conductive element 62 has a "one-line" structure. One end of the first conductive element 62 faces the surface of the circuit board 30, and the other end faces the bottom plate of the housing 10, wherein the bottom plate of the housing 10 and the cover plate 20 are disposed opposite each other. The mounting frame 50 can be disposed on the bottom plate of the housing 10, and the second connector 70 passes through the mounting frame 50 from the bottom surface of the housing 10 and is inserted into the other end of the first conductive element 62. Alternatively, one end of the first conductive element 62 faces the surface of the circuit board 30, and the other end faces the cover plate 20. The mounting frame 50 can be mounted on the cover plate 20, and the second connector 70 passes through the mounting frame 50 from the top surface of the housing 10 (one side of the cover plate 20) and is inserted into the other end of the first conductive element 62.

[0078] Please see Figure 10 and Figure 11 , Figure 10 This is a three-dimensional structural diagram of a second conductive element 71 provided in an embodiment of this application. Figure 11 for Figure 8The diagram shows an enlarged view of point XI in the power conversion device 100. The second conductive element 71 is a metal conductive element, such as a copper busbar or an aluminum busbar. The second conductive element 71 includes a first elastic sheet 711, a second elastic sheet 712, and a connecting portion 713. The first elastic sheet 711 and the second elastic sheet 712 are arranged opposite to each other and spaced apart. The first elastic sheet 711 is connected to the second elastic sheet 712 through the connecting portion 713. The connecting portion 713 is used to connect to an external cable, that is, the connecting portion 713 is connected to the power grid or a load through an external cable. The other end of the first conductive element 62 abuts between the first elastic sheet 711 and the second elastic sheet 712. An opening is formed between the end of the first elastic sheet 711 and the end of the second elastic sheet 712. The size of the opening is larger than the thickness of the first conductive element 62, so that the first conductive element 62 can be more easily inserted into the gap between the first elastic sheet 711 and the second elastic sheet 712. When the second conductive member 71 is inserted into the first conductive member 62, the other end of the first conductive member 62 extends into the gap between the first elastic sheet 711 and the second elastic sheet 712. There is a gap between the first elastic sheet 711 and the second elastic sheet 712 whose size is smaller than the thickness of the first conductive member 62. Thus, the first elastic sheet 711 and the second elastic sheet 712 at the smallest gap deform under the pushing force of the first conductive member 62. When the first elastic sheet 711 and the second elastic sheet 712 recover their deformation, they will squeeze the first conductive member 62, so that the first elastic sheet 711 and the second elastic sheet 712 clamp the first conductive member 62, ensuring the stability of the electrical connection between the first conductive member 62 and the second conductive member 71. Furthermore, when the first conductive element 62 is connected to the second conductive element 71, the other end of the first conductive element 62 is inserted between the first elastic sheet 711 and the second elastic sheet 712, and the opposite sides of the first conductive element 62 abut against the first elastic sheet 711 and the second elastic sheet 712 respectively, which increases the contact area between the first conductive element 62 and the second conductive element 71 and ensures the reliability of the electrical connection between the first conductive element 62 and the second conductive element 71.

[0079] The connecting portion 713 is disposed on one side of the first elastic sheet 711 and the second elastic sheet 712. For example, the first elastic sheet 711 and the second elastic sheet 712 are along the thickness direction of the first elastic sheet 711 (e.g., Figure 10 The connecting portion 713 is disposed in the height direction of the first elastic sheet 711 (as shown in direction A) and is positioned opposite to it. Figure 10 On one side of direction B shown in the diagram, the first conductive element 62 is along the length direction of the first elastic sheet 711 (e.g., direction B). Figure 10The connecting portion 713 (as shown in the C direction) is inserted between the first elastic sheet 711 and the second elastic sheet 712. The thickness direction, length direction, and width direction of the first elastic sheet 711 are perpendicular to each other. A portion of the connecting portion 713 connects the first elastic sheet 711 and the second elastic sheet 712, and another portion of the connecting portion 713 extends beyond the ends of the first elastic sheet 711 and the second elastic sheet 712 in the length direction. The other portion of the connecting portion 713 is connected to an external cable.

[0080] like Figure 10 As shown, in one embodiment, the second conductive element 71 further includes a clamping element 714, which is sleeved on the first elastic sheet 711 and the second elastic sheet 712. The clamping element 714 is used to apply pressure to the first elastic sheet 711 and the second elastic sheet 712 so that the first elastic sheet 711 and the second elastic sheet 712 can press the first conductive element 62 located between them, thereby ensuring the reliability of the electrical connection between the first conductive element 62 and the second conductive element 71.

[0081] Please see Figure 11 and Figure 12 , Figure 12 This is a three-dimensional structural diagram of a base 72 provided in an embodiment of this application. The second connector 70 also includes a base 72, which is used to fix the second conductive element 71. A portion of the base 72 passes through the mounting frame 50 and is inserted into the first connector 60. When the first connector 60 is inserted into the mounting frame 50, there is good alignment between the first connector 60 and the mounting frame 50. When the base 72 passes through the mounting frame 50 and is inserted into the first connector 60, the base 72 can be quickly and accurately inserted into the first connector 60, so that the second conductive element 71 fixed on the base 72 can be better inserted into the first conductive element 62. The base 72 forms a space to accommodate the second conductive element 71, and the second conductive element 71 can be completely accommodated in the base 72. The base 72 provides insulation and protection for the second conductive element 71.

[0082] The base 72 includes a base body 721, a guide portion 722, and a third through hole 723. A portion of the base body 721 is housed within a mounting frame 50, allowing the mounting frame 50 to support the base 72. The guide portion 722 is located on the side of the base body 721 facing the first connector 60 and is inserted into a second mounting groove 613. The guide portion 722 and the base body 721 can be an integral structure or separate structures, and can be connected together by insertion or screws. The third through hole 723 penetrates the base body 721 and the guide portion 722, and accommodates a second conductive element 71. When the second connector 70 is inserted into the first connector 60, the guide portion 722 passes through the mounting frame 50 and extends into the second mounting groove 613 along the side wall of the second mounting groove 613. Guided by the guide portion 722 and the second mounting groove 613, the first conductive element 62 can extend into the third through hole 723 and contact the second conductive element 71 to achieve electrical connection between the two. Furthermore, the guide portion 722 and the side wall of the second mounting groove 613 can provide insulation and protection for the contact position between the first conductive element 62 and the second conductive element 71, preventing the contact position between the second conductive element 71 and the first conductive element 62 from being exposed, thus improving the safety of using the first connector 60 and the second connector 70.

[0083] The number of guide portions 722 is one or more, and the number of guide portions 722 corresponds one-to-one with the number of second mounting grooves 613. When there are multiple guide portions 722, the multiple guide portions 722 are arranged at intervals, and each guide portion 722 is formed with a third through hole 723. The third through hole 723 passes through the corresponding guide portion 722 and the seat body 721, and each third through hole 723 is provided with a second conductive element 71.

[0084] In this configuration, a portion of the first elastic sheet 711 and a portion of the second elastic sheet 712 are located within the guide portion 722, while the other portion of the first elastic sheet 711, the other portion of the second elastic sheet 712, and the connecting portion 713 are all located within the seat body 721. When the connecting portion is inserted into the second mounting groove 613, the first conductive member 62 extends from the guide portion 722 into the third through hole 723, abutting between the first elastic sheet 711 and the second elastic sheet 712. The first conductive member 62, inserted between the first elastic sheet 711 and the second elastic sheet 712, is located within the guide portion 722.

[0085] Please combine Figure 12 and Figure 13 , Figure 13This is an exploded view of the second conductive element 71, elastic element 73, and locking element 74 provided in an embodiment of this application. An external cable extends from the side of the base 721 away from the guide portion 722 into the third through hole 723 and is connected and fixed to the connecting portion 713. The base 721 also has an opening 724, which corresponds to and communicates with the third through hole 723. The second connector 70 also includes an elastic element 73 and a locking element 74. The elastic element 73 is connected and fixed to the base 721 and housed within the third through hole 723. The elastic element 73 is positioned opposite to the opening 724. The elastic element 73 has a hollow structure and is deformable. The space enclosed by the elastic element 73 is used to house the external cable and a portion of the connecting portion 713. The locking member 74 passes through the opening 724 and is connected to the elastic member 73. During the locking process of the locking member 74 and the elastic member 73, the elastic member 73 deforms and moves the external cable toward the connection part 713. Under the action of the locking member 74 and the elastic member 73, the external cable and the elastic member 73 are pressed together, realizing the electrical connection between the external cable and the connection part 713.

[0086] Specifically, the elastic element 73 includes a first plate 731, a second plate 732, a third plate 733, a first bridging portion 734, and a second bridging portion 735. The first plate 731, the first bridging portion 734, the third plate 733, the second bridging portion 735, and the second plate 732 are connected sequentially. The first plate 731 and the second plate 732 are stacked on the same side of the first bridging portion 734, wherein the first plate 731 is closer to the third plate 733 than the second plate 732. The portion of the external cable and the connecting portion 713 is located around the first bridging portion 734, the third plate 733, the second bridging portion 735, and the first plate 731. Within the formed space, when an external cable extends into the space, the locking member 74 passes through the second plate 732 and connects to the first plate 731. During the locking process between the locking member 74 and the first plate 731, the elastic member 73 undergoes elastic deformation, causing the third plate 733 to move towards the first plate 731, thereby pressing the external cable and the connecting part 713 together to achieve electrical connection. The external cable and the connecting part 713 are connected together by the locking member 74 and the elastic member 73. The locking member 74 does not need to directly contact the connecting part 713 and the external cable, ensuring the structural integrity of the connecting part 713, thereby ensuring the stability of the electrical connection between the connecting part 713 and the external cable.

[0087] Please combine Figure 11 and Figure 14 , Figure 14This is an exploded structural diagram of the mounting frame 50 and the second connector 70 provided in one embodiment of this application. The second connector 70 also includes a second housing 75, which has a receiving cavity 751 that receives a portion of the base 721. The second housing 75 is connected to the base 721, and portions of the second housing 75 and the base 721 are spaced apart. A second protrusion 53 of the mounting frame 50 is sleeved on the outer periphery of the base 721, and is located between the base 721 and the second housing 75. A gap is reserved between the portion of the base 721 and the second housing 75. When the second connector 70 passes through the mounting frame 50 and is inserted into the first connector 60, the second protrusion 53 can fit into the gap between the base 721 and the second housing 75, allowing the second connector 70 to be connected and fixed to the mounting frame 50 by insertion, thus achieving a quick-connect design between the second connector 70 and the mounting frame 50.

[0088] Both the second housing 75 and the base 72 can be made of insulating material to provide insulation and protection for the second conductive element 71.

[0089] The power conversion device 100 also includes a third seal 93, which is disposed between the second housing 75 and the base 721 and is used to seal the gap between the second housing 75 and the base 721.

[0090] Please combine Figure 8 The second connector 70 also includes a magnetic ring 76, which is disposed within the second housing 75, i.e., within the receiving cavity 751, to prevent the magnetic ring 76 from being exposed and affecting its service life. The magnetic ring 76 is located on one side of the base 721, for example, on the side of the second conductive element 71 opposite to the first conductive element 62. Thus, it is unnecessary to reserve space or design an installation structure on the outer periphery of the second housing 75 directly opposite the second conductive element 71, which helps to reduce the size of the second connector 70.

[0091] Specifically, the second housing 75, on the side facing away from the housing 10, is also provided with a through hole 753 for external cables to pass through. The through hole 753 is positioned opposite to the magnetic ring 76. Since the magnetic ring 76 has a ring-shaped structure, that is, a hole structure is formed on the magnetic ring 76, the through hole 753 communicates with the hole structure on the magnetic ring 76. Thus, after the external cable passes through the through hole 753 and the magnetic ring 76, it connects to the connection portion 713 of the second conductive member 71. By placing the magnetic ring 76 on the side of the second conductive member 71 facing away from the first conductive member 62, the magnetic ring 76 can not only block magnetic interference inside the power conversion device 100, but also prevent magnetic interference conducted to the outside of the power conversion device 100 through the first connector 60 and the second connector 70, reducing the magnetic crosstalk effect of the power conversion device 100 on the external power grid and load, thereby improving the EMC between the external cable and the second connector 70. At the same time, the magnetic ring 76 can also effectively suppress interference signals from entering the power conversion device 100 along the external cable.

[0092] In other embodiments, the magnetic ring 76 is disposed on the outer periphery of at least one of the first conductive member 62 and the second conductive member 71. For example, the magnetic ring 76 is sleeved on the outer periphery of multiple first conductive members 62, or on the outer periphery of the first protrusion 52, to achieve the installation of the magnetic ring 76. Alternatively, the magnetic ring 76 is sleeved on the outer periphery of multiple second conductive members 71, such as on the outer periphery of the second protrusion 53, to achieve the installation of the magnetic ring 76. Yet another example is that the magnetic ring 76 is sleeved on the outer periphery of the junction between the second conductive member 71 and the first conductive member 62, thus the magnetic ring 76 is simultaneously located on the outer periphery of both the first conductive member 62 and the second conductive member 71.

[0093] like Figure 14 As shown, the second connector 70 also includes a locking element 77 and a pressing element 78. Both the locking element 77 and the pressing element 78 are located outside the second housing 75. The pressing element 78 is connected to the locking element 77 and can move within a preset pressing stroke to engage or disengage the locking element 77 from the mounting frame 50. The mounting frame 50 is provided with a locking block 54. The locking element 77 includes a connecting plate 771 and locking arms 772 located at both ends of the connecting plate 771. The connecting plate 771 is connected to the pressing element 78. The second housing 75 has hinge shafts 752 on both side walls. Locking arms 772 are connected to hinge shafts 752 and can rotate along hinge shafts 752. Locking arms 772 are used to engage or disengage with locking blocks 54. For example, when pressure is applied to the pressing member 78, the connecting plate 771 drives the locking arms 772 at both ends to rotate along hinge shafts 752, thereby engaging or disengaging the locking arms 772 with locking blocks 54. The locking member 77 engages with the mounting frame 50 to strengthen the connection between the second connector 70 and the mounting frame 50.

[0094] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such 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 by, The box, the circuit board, the mounting frame, the first connector and the second connector, the box contains the circuit board, the box is provided with a first through hole, the circuit board is provided with a power conversion circuit, the power conversion circuit is used for converting direct current from a photovoltaic module or an energy storage battery into alternating current, and the alternating current is delivered to a power grid or a load; The mounting frame is mounted in the first through hole; the first connector is arranged on the circuit board and electrically connected with the circuit board; at least one of the first connector and the second connector penetrates the mounting frame, the second connector is inserted into and electrically connected with the first connector, and the second connector is used for connecting the power grid or the load.

2. The power conversion device of claim 1, wherein, The mounting frame includes a fixed plate and a first protrusion, the fixed plate is connected with the box, and the first protrusion is protruded from one side of the fixed plate towards the first connector; the first protrusion is inserted into the first connector.

3. The power conversion device of claim 2, wherein, The fixed plate is arranged outside the box, the first protrusion penetrates the first through hole and is inserted into the first connector, and a gap is formed between the side wall of the first through hole and the first protrusion.

4. The power conversion device according to claim 2 or 3, characterized by The fixed plate is provided with a second through hole, and the power conversion device further includes a fastener, the fastener includes a head and a rod, the head is arranged at one end of the rod, the head is located on one side of the fixed plate, the rod penetrates the second through hole and is connected with the box, and a gap is formed between the side wall of the second through hole and the rod.

5. A power conversion device according to any one of claims 2-4, characterised in that, The first connector includes a first shell and a first conductive piece, the first shell is inserted into the first protrusion, and the first conductive piece penetrates the first shell; one end of the first conductive piece is electrically connected with the circuit board, and the other end of the first conductive piece is electrically connected with the second connector.

6. The power conversion device of claim 5, wherein, The first shell is provided with a first mounting groove, and the groove opening of the first mounting groove faces one side of the mounting frame; the first protrusion is inserted into the first mounting groove.

7. The power conversion device of claim 6, wherein, The first shell is further provided with a second mounting groove, the groove opening of the second mounting groove faces one side of the mounting frame, and the second mounting groove contains the other end of the first conductive piece; the first mounting groove is arranged on the outer periphery of the second mounting groove; The second connector includes a second conductive piece, part of the second conductive piece is located in the second mounting groove, and the second conductive piece is inserted into and electrically connected with the other end of the first conductive piece.

8. The power conversion device of claim 7, wherein, The second conductive piece includes a first elastic sheet, a second elastic sheet and a connecting portion, the first elastic sheet and the second elastic sheet are arranged opposite to and spaced from each other, the first elastic sheet is connected with the second elastic sheet through the connecting portion, the connecting portion is used for connecting with an external cable, and the other end of the first conductive piece abuts between the first elastic sheet and the second elastic sheet.

9. The power conversion device of claim 8, wherein, The second connector further includes a base, the base is used for fixing the second conductive piece of the second connector, and part of the base penetrates the mounting frame and is inserted into the first connector.

10. The power conversion device of claim 9, wherein, The base comprises a seat body, a guide portion and a third through hole, the seat body is partially accommodated in the mounting frame, the guide portion is arranged on a side of the seat body facing the first connector, the guide portion is inserted with the second mounting slot, the third through hole penetrates the seat body and the guide portion, and the third through hole accommodates the second conductive piece.

11. The power conversion device of claim 10, wherein, The second connector further comprises a second housing connected with the seat body, the second housing is spaced apart from a part of the seat body, and the mounting frame further comprises a second protrusion arranged on a side of the fixed plate facing the second connector, the second protrusion is arranged between the seat body and the second housing.

12. The power conversion device of claim 11, wherein, The second connector further comprises a magnetic ring arranged in the second housing, the magnetic ring is located on a side of the second conductive piece away from the first conductive piece, and an external cable passes through the magnetic ring and is connected with the second conductive piece; or The magnetic ring is arranged on the outer periphery of at least one of the first conductive piece and the second conductive piece.

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