Power conversion device

Abstract

The invention provides a power conversion device, and relates to the technical field of photovoltaic power generation. The device comprises a device shell with a containing cavity, a photovoltaic connector, a circuit board, a direct current switch and a power conversion circuit. And one end of the photovoltaic connector is fixed outside the device shell, and the other end of the photovoltaic connector is electrically connected with the circuit board in the accommodating cavity. The board surface of the circuit board is fixed with the side wall of the accommodating cavity; and the circuit board is provided with a lightning protection circuit of which the input end is electrically connected between the photovoltaic connector and the first static contact of the direct current switch and the output end is grounded. The DC switch comprises a handle, an operating mechanism and a plurality of stacked switch bodies. The operating mechanism and the plurality of switch bodies are fixed in the accommodating cavity, and the arrangement direction of the plurality of switch bodies is parallel to the side wall. Each switch body comprises a moving contact, a first static contact electrically connected with the photovoltaic connector through the circuit board, and a second static contact electrically connected with the power conversion circuit. The device can reduce the space occupied by the direct current switch in the direction perpendicular to the side wall of the accommodating cavity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic power generation, and in particular to a power conversion device. BACKGROUND

[0002] As the core electric energy conversion equipment of a solar power generation system, a photovoltaic inverter bears the key function of converting direct current generated by a photovoltaic module into alternating current and connecting to a power grid. Inside the photovoltaic inverter, a direct current switch as a key component is configured at the direct current input side of the photovoltaic inverter, for cutting off the direct current from a photovoltaic module string when needed; and a lightning protection circuit is used for resisting the instantaneous overvoltage impact from the direct current input line, to protect the internal electronic components of the inverter from damage. Therefore, the direct current switch and the lightning protection circuit are crucial safety protection links at the direct current input side of the photovoltaic inverter.

[0003] The above-mentioned direct current switch and lightning protection circuit are usually arranged in the housing of the inverter. However, in the conventional scheme, these key protection devices are dispersedly arranged in the housing, and occupy a large space in the direction perpendicular to the side wall of the housing. This arrangement not only increases the complexity of internal wiring, but also squeezes the space resources in the direction perpendicular to the side wall of the housing, so that the layout space of other devices inside the housing is squeezed, resulting in that the overall layout design of the photovoltaic inverter is limited. SUMMARY

[0004] The present application provides a power conversion device. The power conversion device can reduce the occupation of the direct current switch to the internal space of the accommodating cavity in the direction perpendicular to the side wall of the accommodating cavity, which is beneficial to the layout of the power conversion circuit and other devices in the accommodating cavity.

[0005] To achieve the above-mentioned purpose, the embodiments of the present application adopt the following technical solutions:

[0006] The present application provides a power conversion device, which comprises a device shell, a photovoltaic connector, a circuit board, a direct current switch and a power conversion circuit. The device shell has an accommodating cavity; one end of the photovoltaic connector is fixed outside the device shell, the other end of the photovoltaic connector penetrates through the device shell and extends into the accommodating cavity, and the photovoltaic connector is electrically connected with the circuit board. The circuit board is located in the accommodating cavity, and the board surface of the circuit board is fixed with the side wall of the accommodating cavity, and the lightning protection circuit is arranged on the circuit board. The direct current switch comprises a handle, an operating mechanism and a plurality of switch bodies arranged in layers; wherein the handle is connected outside the device shell, the operating mechanism and the plurality of switch bodies are fixed in the accommodating cavity, and the arrangement direction of the plurality of switch bodies is parallel to the side wall.

[0007] Each switch body comprises a moving contact, a first static contact and a second static contact, the moving contact is in transmission connection with the operating mechanism, and the first static contact and the second static contact are fixed relative to the device shell; the first static contact of each switch body is in electrical connection with the circuit board and is in electrical connection with the photovoltaic connector through the circuit board; the second static contact of each switch body is in electrical connection with the power conversion circuit; the input end of the lightning protection circuit is electrically connected between the photovoltaic connector and the first static contact, and the output end of the lightning protection circuit is grounded. The handle is used to drive the moving contact to rotate through the operating mechanism, so that the moving contact of each switch body is in electrical connection or disconnection with the first static contact and the second static contact.

[0008] The present application drives the operation of the operating mechanism in the device shell by rotating the handle outside the device shell, and can drive the moving contact of each switch body to rotate through the operating mechanism, so that the moving contact of each switch body is in electrical connection or disconnection with the first static contact and the second static contact. When the moving contact is in electrical connection with the first static contact and the second static contact, the photovoltaic connector can be electrically connected with the power conversion circuit through the circuit board and the direct current switch; when the moving contact is in electrical disconnection with the first static contact and the second static contact, the photovoltaic connector is disconnected from the power conversion circuit. The input end of the lightning protection circuit is connected between the photovoltaic connector and the first static contact, and the output end is grounded, which can resist the instantaneous overvoltage impact (such as lightning induced surge) generated on the photovoltaic connector side, and protect the electronic components inside the power conversion device from being damaged.

[0009] In the power conversion device provided in the present application, the arrangement direction of the plurality of switch bodies of the direct current switch is parallel to the side wall, and in the direct current switch, the size of the direct current switch in the arrangement direction of the plurality of switch bodies is obviously larger than the size in the direction perpendicular to the arrangement direction. Therefore, the arrangement direction of the plurality of switch bodies of the direct current switch is parallel to the side wall, which can reduce the size of the direct current switch extending into the interior of the accommodating cavity in the direction perpendicular to the side wall, and further reduces the occupation of the interior space of the accommodating cavity in the direction perpendicular to the side wall. In addition, the lightning protection circuit is arranged on the circuit board, which can effectively utilize the circuit board. Compared with arranging the lightning protection circuit on the power board or other circuit board of the power conversion device, the number of wiring cables of the lightning protection circuit is reduced, the occupation of the interior space of the accommodating cavity in the direction perpendicular to the side wall by the wiring cables of the lightning protection circuit is reduced, the wiring complexity of the lightning protection circuit is reduced, and the compactness of the layout structure is improved. That is, the power conversion device of the present application can reduce the occupation of the layout space of other devices in the accommodating cavity by the direct current switch and the lightning protection circuit in the direction perpendicular to the side wall by arranging the direct current switch in the accommodating cavity as above and arranging the lightning protection circuit on the circuit board, which is beneficial to the layout of the power conversion circuit and other related devices in the accommodating cavity, and facilitates the overall layout design of the power conversion device.

[0010] In an implementation, the operating mechanism and the plurality of switch bodies are fixed to the one side of the circuit board away from the side wall, the first stationary contact of each switch body is electrically connected with the circuit board, and the second stationary contact of each switch body is electrically connected with the power conversion circuit through the second electrical connecting member.

[0011] The present application can shorten the electrical connection path between the first stationary contact of the direct current switch and the circuit board by fixing the operating mechanism and the plurality of switch bodies to the circuit board, which can shorten the cable length between the first stationary contact and the circuit board on the one hand, thereby reducing the wiring cost, and can improve the compactness of the structure in the accommodating cavity on the other hand, thereby reducing the occupation of the internal space of the accommodating cavity by the input cable of the direct current switch, so as to reserve more space for accommodating the power conversion circuit or other electronic circuits or devices.

[0012] In an implementation, each switch body comprises a first housing, the movable contact is located in the first housing, and the first stationary contact and the second stationary contact are partially located in the first housing and partially exposed from the first housing. The part of the first stationary contact of each switch body exposed from the first housing and the part of the second stationary contact exposed from the first housing are located at different sides of the first housing, and the part of the first stationary contact of each switch body exposed from the first housing is located at the side of the first housing facing the circuit board and is welded with the circuit board.

[0013] The present application locates the part of the first stationary contact of each switch body exposed from the first housing at the side of the first housing facing the circuit board and welded with the circuit board, so that when the switch body is fixed to the one side of the circuit board away from the side wall, the switch body can be directly fixed with the circuit of the circuit board by welding, thereby saving the connecting cable and the related power distribution components between the circuit board and the first stationary contact, which can save the cost and simplify the electrical connection circuit, so that the power conversion device circuit is more neat, and the occupation of the internal space of the accommodating cavity by the cable can be avoided, which is beneficial to the layout of the devices in the accommodating cavity. In addition, the part of the first stationary contact of each switch body exposed from the first housing and the part of the second stationary contact exposed from the first housing are located at different sides of the first housing, which means that the part of the second stationary contact exposed from the first housing is not arranged at the side of the first housing facing the circuit board. Thus, when the plurality of switch bodies are fixed to the circuit board, at least part of the second stationary contact can be exposed from the circuit board, so that the second stationary contact can be electrically connected with the power conversion circuit through the second electrical connecting member.

[0014] In an implementation, the direct current switch comprises a first switch and a second switch spaced apart, and the plurality of photovoltaic connectors comprises a plurality of photovoltaic connectors, a part of the plurality of photovoltaic connectors is electrically connected with the first switch through the circuit board, and another part of the plurality of photovoltaic connectors is electrically connected with the second switch through the circuit board.

[0015] The direct current switch is designed as a modular structure including a first switch and a second switch, the modular design can effectively utilize the installation space on the circuit board, and improve the space utilization on the circuit board. In addition, the first switch and the second switch can be installed in a dispersed manner according to the physical interface positions of the corresponding photovoltaic connectors, the distance between the switch and the photovoltaic connector is reduced, thereby shortening the length of the wire on the circuit board for electrically connecting the corresponding switch and the photovoltaic connector, improving the wiring redundancy required by the centralized large-volume direct current switch, avoiding or reducing the crossing of the copper bars or cables inside the accommodation cavity, and facilitating the neat wiring of the power conversion device.

[0016] In an implementation manner, the arrangement directions of the plurality of switch bodies of the first switch and the plurality of switch bodies of the second switch are both perpendicular to the bottom surface of the accommodation cavity; the lightning protection circuit is located between the first switch and the second switch; the plurality of photovoltaic connectors include a first part and a second part, wherein the projection of the first part on the side of the circuit board away from the side wall is located between the first switch and the lightning protection circuit, and the projection of the second part on the side of the circuit board away from the side wall is located between the second switch and the lightning protection circuit.

[0017] The lightning protection circuit is located between the first part of the plurality of photovoltaic connectors and the second part of the plurality of photovoltaic connectors, that is, the lightning protection circuit is arranged between the two parts of the plurality of photovoltaic connectors, so that the lightning protection circuit is located close to the plurality of photovoltaic connectors, and when the photovoltaic connector generates a transient high voltage or a large current, the lightning protection circuit can quickly respond and conductively discharge, so as to protect or reduce the damage to the internal circuit of the power conversion device.

[0018] In an implementation manner, the circuit board further has a first arc fault detection circuit and a second arc fault detection circuit, the first arc fault detection circuit is electrically connected between the first part and the first switch, and the second arc fault detection circuit is electrically connected between the second part and the second switch; the first arc fault detection circuit is located between the projection of the first part on the side of the circuit board away from the side wall and the first switch, and the second arc fault detection circuit is located between the projection of the second part on the side of the circuit board away from the side wall and the second switch.

[0019] The first arc fault detection circuit and the second arc fault detection circuit are arranged on the circuit board, and are electrically connected between the corresponding switch and the part of the plurality of photovoltaic connectors, so that the first arc fault detection circuit and the second arc fault detection circuit are close to the photovoltaic connector, can prevent the attenuation, distortion or interference of the detection signal caused by the long transmission path to a certain extent, and are beneficial to improving the detection accuracy of the arc fault detection circuit for detecting whether there is an arc phenomenon near the photovoltaic connector.

[0020] In an implementation, the operating mechanism and the plurality of switch bodies of the first switch and the operating mechanism and the plurality of switch bodies of the second switch are fixed to the side of the circuit board away from the side wall.

[0021] The application can reduce the number of parts of the power conversion device, reduce the assembly difficulty of the parts, and improve the production efficiency by fixing the first switch and the second switch on the same circuit board.

[0022] In an implementation, the circuit board comprises a first sub-board and a second sub-board arranged at intervals, and the surface of the first sub-board and the surface of the second sub-board are fixed to the side wall; a part of the plurality of photovoltaic connectors are electrically connected to the first sub-board, and another part of the plurality of photovoltaic connectors are electrically connected to the second sub-board. The operating mechanism and the plurality of switch bodies of the first switch are fixed to the side of the first sub-board away from the side wall, and the part of the plurality of photovoltaic connectors are electrically connected to the first switch through the first sub-board; the operating mechanism and the plurality of switch bodies of the second switch are fixed to the side of the second sub-board away from the side wall, and the other part of the plurality of photovoltaic connectors are electrically connected to the second switch through the second sub-board.

[0023] The application can reduce the size of the single sub-board by dividing the circuit board into the first sub-board and the second sub-board arranged at intervals and fixing the first switch and the second switch on different sub-boards, and the single sub-board does not need to bear all the switches, thereby improving the insufficient rigidity and the decline of structural reliability of the single sub-board due to the excessive size to a certain extent.

[0024] In an implementation, the lightning protection circuit comprises a first lightning protection circuit and a second lightning protection circuit, wherein the first lightning protection circuit is arranged on the first sub-board, the input end of the first lightning protection circuit is electrically connected between the first switch and the photovoltaic connector electrically connected to the first sub-board, and the output end of the first lightning protection circuit is grounded; the second lightning protection circuit is arranged on the second sub-board, the input end of the second lightning protection circuit is electrically connected between the second switch and the photovoltaic connector electrically connected to the second sub-board, and the output end of the second lightning protection circuit is grounded.

[0025] The application can resist the instantaneous overvoltage impact generated on the side of the photovoltaic connector on the first sub-board and the instantaneous overvoltage impact generated on the side of the photovoltaic connector on the second sub-board by arranging the first lightning protection circuit on the first sub-board and the second lightning protection circuit on the second sub-board when the first switch is fixed on the first sub-board and the second switch is fixed on the second sub-board, so as to protect the electronic components inside the power conversion device from being damaged.

[0026] In an implementation manner, the lightning protection circuit further comprises a conductive member. The output end of the second lightning protection circuit is electrically connected to the output end of the first lightning protection circuit through the conductive member, or the output end of the first lightning protection circuit is electrically connected to the output end of the second lightning protection circuit through the conductive member.

[0027] The conductive member is arranged, the first lightning protection circuit on the first sub-board and the second lightning protection circuit on the second sub-board can realize sharing of part of the circuit structure, which can simplify the circuit structure of the lightning protection circuit, simplify the internal circuit structure of the power conversion device, reduce the cost, and facilitate industrialization of the power conversion device.

[0028] In an implementation manner, the operating mechanism is provided with at least part of the switch bodies on two opposite sides in a direction parallel to the side wall. The operating mechanism comprises an input shaft and two sub-output shafts. The moving contact of the switch body on one side of the operating mechanism is in transmission connection with the input shaft through one of the sub-output shafts, and the moving contact of the switch body on the other side of the operating mechanism is in transmission connection with the input shaft through the other sub-output shaft.

[0029] The operating mechanism is provided with at least part of the switch bodies on two opposite sides, and two sub-output shafts are arranged, which can drive the switch bodies on two sides of the operating mechanism to open or close, and two groups of switch bodies can be controlled through one operating mechanism. In addition, compared with the combination of two independent DC switches, the integrated DC switch can save one group of operating mechanisms, reduce the overall volume of the DC switch, reduce the area occupied by the DC switch on the circuit board, and thus the size of the circuit board can be reduced.

[0030] In an implementation manner, the arrangement direction of the plurality of switch bodies of the DC switch is parallel to the bottom surface of the accommodating cavity, the photovoltaic connector is perpendicular to the arrangement direction of the DC switch and the bottom surface of the accommodating cavity, and the lightning protection circuit is located on the side of the photovoltaic connector away from the DC switch.

[0031] Since the arrangement direction of the plurality of switch bodies of the DC switch is parallel to the bottom surface of the accommodating cavity, the size of the DC switch in the direction in which the circuit board is parallel to the bottom surface of the accommodating cavity is large. Therefore, the photovoltaic connector is perpendicular to the arrangement direction of the DC switch and the bottom surface of the accommodating cavity, and the lightning protection circuit is arranged on the side of the photovoltaic connector away from the DC switch. In this way, the layout of the lightning protection circuit can increase the rigidity of the circuit board and improve the structural reliability of the circuit board.

[0032] In an implementation manner, the circuit board is further provided with an arc fault detection circuit, the arc fault detection circuit being electrically connected between the photovoltaic connector and the DC switch; the arc fault detection circuit comprises a first arc fault detection circuit and a second arc fault detection circuit, and the first arc fault detection circuit and the second arc fault detection circuit are respectively located on opposite sides of the DC switch along the arrangement direction of the plurality of switch bodies of the DC switch.

[0033] The arc fault detection circuit can detect whether there is an arc phenomenon near the photovoltaic connector, thereby improving the working reliability of the power conversion device. By respectively arranging the first arc fault detection circuit and the second arc fault detection circuit of the arc fault detection circuit on opposite sides of the DC switch along the arrangement direction of the plurality of switch bodies of the DC switch, the space of the DC switch along the arrangement direction of the plurality of switch bodies can be effectively utilized, thereby improving the space utilization rate of the circuit board.

[0034] In an implementation manner, the operating mechanism and the plurality of switch bodies are fixed to the side wall, the first stationary contact of each switch body is electrically connected to the circuit board through the first electrical connection member, and the second stationary contact of each switch body is electrically connected to the power conversion circuit through the second electrical connection member.

[0035] The operating mechanism and the plurality of switch bodies of the DC switch are directly fixed to the side wall of the accommodating cavity, which can also reduce the occupation of the layout space of other devices in the accommodating cavity by the DC switch along the direction perpendicular to the side wall, thereby facilitating the layout of the power conversion circuit and other related devices in the accommodating cavity.

[0036] In an implementation manner, the DC switch comprises a first switch and a second switch which are spaced apart, and the photovoltaic connector comprises a plurality of photovoltaic connectors, a part of the plurality of photovoltaic connectors being electrically connected to the first switch through the circuit board and the first electrical connection member, and another part of the plurality of photovoltaic connectors being electrically connected to the second switch through the circuit board and the first electrical connection member.

[0037] The DC switch is designed as a modular structure comprising at least two parts of the first switch and the second switch, the first switch and the second switch can be installed in a dispersed manner according to the physical interface positions of the corresponding photovoltaic connectors (for example, the first switch and the second switch are fixed to opposite sides of the circuit board), the distance between each switch and the corresponding photovoltaic connector electrically connected thereto is reduced, thereby shortening the wire length of the circuit for electrically connecting the corresponding photovoltaic terminal and the first electrical connection member on the circuit board and the wire length of the corresponding first electrical connection member, so as to facilitate neat wiring of the power conversion device.

[0038] In an implementation, the arrangement direction of the plurality of switch bodies of the first switch and the arrangement direction of the plurality of switch bodies of the second switch are both perpendicular to the bottom surface of the accommodating cavity; the lightning protection circuit is located between the first switch and the second switch; the photovoltaic connector includes a first part and a second part, wherein the projection of the first part on the side of the circuit board away from the side wall is located between the first switch and the lightning protection circuit, and the projection of the second part on the side of the circuit board away from the side wall is located between the second switch and the lightning protection circuit.

[0039] According to the above arrangement, the lightning protection circuit is located between the projection of the first part on the side of the circuit board away from the side wall and the projection of the second part on the side of the circuit board away from the side wall, that is, the lightning protection circuit is arranged inside the plurality of photovoltaic connectors. In this way, the lightning protection circuit is located close to the plurality of photovoltaic connectors, and when the photovoltaic connector generates a transient high voltage or a large current, the lightning protection circuit can quickly respond and conductively discharge to protect the internal circuit of the power conversion device from damage or reduce the damage to the internal circuit of the power conversion device.

[0040] In an implementation, the circuit board further has a first arc fault detection circuit and a second arc fault detection circuit, the first arc fault detection circuit is electrically connected between the first part and the first switch, and the second arc fault detection circuit is electrically connected between the second part and the second switch; the first arc fault detection circuit is located between the projection of the first part on the side of the circuit board away from the side wall and the first switch, and the second arc fault detection circuit is located between the projection of the second part on the side of the circuit board away from the side wall and the second switch.

[0041] According to the above arrangement, the lightning protection circuit is located between the projection of the first part on the side of the circuit board away from the side wall and the projection of the second part on the side of the circuit board away from the side wall, that is, the lightning protection circuit is arranged inside the plurality of photovoltaic connectors. In this way, the lightning protection circuit is located close to the plurality of photovoltaic connectors, and when the photovoltaic connector generates a transient high voltage or a large current, the lightning protection circuit can quickly respond and conductively discharge to protect the internal circuit of the power conversion device from damage or reduce the damage to the internal circuit of the power conversion device.

[0042] In an implementation, along a direction parallel to the side wall, the operation mechanism has a plurality of switch bodies on both sides of the operation mechanism. The operation mechanism includes an input shaft and two sub-output shafts; wherein the input shaft is fixed with the handle, the movable contact of the switch body on one side of the operation mechanism is in transmission connection with the input shaft through one of the sub-output shafts, and the movable contact of the switch body on the other side of the operation mechanism is in transmission connection with the input shaft through the other sub-output shaft.

[0043] The application can realize the on-off control of two groups of switch bodies by one operating mechanism through setting at least part of the switch bodies on the opposite sides of the operating mechanism and setting two sub-output shafts. In addition, compared with the combination of two independent DC switches, the integrated DC switch can save one group of operating mechanisms, reduce the overall volume of the DC switch, and reduce the area occupation of the DC switch on the circuit board.

[0044] In an implementation manner, a plurality of photovoltaic connectors are included, each of which includes a first photovoltaic connector and a second photovoltaic connector, the first photovoltaic connector is used for electrically connecting with a positive line of a photovoltaic string, and the second photovoltaic connector is used for electrically connecting with a negative line of the photovoltaic string.

[0045] The circuit board has a plurality of first lines and a plurality of second lines, wherein each first photovoltaic connector is electrically connected with an input end of one first line, at least part of the plurality of second photovoltaic connectors are connected in parallel and electrically connected with an input end of one second line, and an output end of each first line and an output end of each second line are electrically connected with a first static contact of the DC switch.

[0046] The application can support the parallel connection of MPPT negative lines through the parallel connection of the second photovoltaic terminals in the photovoltaic connectors and the electrical connection with the second lines of the circuit board. In this way, when a large number of photovoltaic connectors need to be connected, the line integration of the circuit board can be realized through the above-mentioned negative line parallel connection, the size of the circuit board and the number of output lines of the circuit board are reduced, the number of poles of the DC switch is reduced when the circuit board and the DC switch are electrically connected, thereby realizing the reduction of the volume of the DC switch and the reduction of the number of input and output cables of the DC switch, and the number of power distribution components of the power conversion device is reduced.

[0047] In an implementation manner, the part of the photovoltaic connector extending into the accommodating cavity is fixed to one side of the circuit board facing the side wall and is in contact with the lines on the circuit board.

[0048] Through the above-mentioned arrangement, the photovoltaic connector can directly contact the lines on the circuit board when it is fixed on the circuit board, the wiring components (such as cables or copper bars) between the circuit board and the photovoltaic connector can be omitted, the number of components of the power conversion device can be reduced, the wiring line is simplified, the internal lines of the power conversion device are more tidy, and the device layout in the internal space of the accommodating cavity is facilitated.

[0049] In one implementation, each switch body includes a first housing, with a moving contact located within the first housing. A first stationary contact and a second stationary contact are each partially located within the first housing and partially exposed thereout. The operating mechanism includes a second housing, an input shaft, and an output shaft. One end of the input shaft is located outside the housing and connected to a handle, while the other end passes through the housing and extends into the second housing. One end of the output shaft is located inside the second housing and is drively connected to the input shaft, while the other end passes through the first housing and connects to the moving contact of each switch body. The operating mechanism drives the moving contact of each switch body to rotate via the output shaft. The first and second housings are fixedly connected, and the output shaft is fixedly connected to the moving contact of the switch body closest to the operating mechanism among the multiple switch bodies.

[0050] This application fixes the first housing of the switch body and the second housing of the operating mechanism in a fixed connection. When the operating mechanism and the switch body are fixed to the circuit board or to the side wall of the accommodating cavity, the operating mechanism and the switch body of the DC switch can be installed as a whole, which improves the assembly efficiency and assembly accuracy of the power conversion device.

[0051] In one implementation, each switch body includes a first housing, with a moving contact located within the first housing. A first stationary contact and a second stationary contact are each partially located within the first housing and partially exposed thereout. The operating mechanism includes a second housing, an input shaft, and an output shaft. One end of the input shaft is located outside the housing and connected to a handle, while the other end passes through the housing and extends into the second housing. One end of the output shaft is located inside the first housing and is drively connected to the input shaft, while the other end passes through the first housing and connects to the moving contact of each switch body. The operating mechanism drives the moving contact of each switch body to rotate via the output shaft. The second housing and the first housing of the switch body closest to the operating mechanism among the multiple switch bodies are detachably connected, as are the output shaft and the moving contact of the switch body closest to the operating mechanism among the multiple switch bodies.

[0052] This application detachably connects the first housing of the operating mechanism to the first housing of the switch body closest to the operating mechanism among multiple switch bodies. This allows the operating mechanism to be separated from the multiple switch bodies. Thus, if the height of the operating mechanism exceeds the height limit of the space used for assembling the circuit board and DC switch, this application modularizes the operating mechanism and switch bodies (i.e., the operating mechanism and switch bodies can be separated to form two independent modules). In scenarios with limited assembly space, multiple switch bodies can be fixed to a terminal block first, and then the operating mechanism can be installed on the circuit board after leaving the space-constrained environment, connecting the operating mechanism to the switch body closest to the operating mechanism among the multiple stacked switch bodies. This arrangement enables the assembly of DC switches in height-constrained environments, reducing process complexity and production costs. Since the moving contact of the output shaft and the switch body closest to the operating mechanism is detachably connected, this detachable connection between the operating mechanism and the switch body closest to the operating mechanism will not affect the normal opening and closing of the DC switch.

[0053] In one implementation, the handle and operating mechanism are arranged perpendicular to the sidewall.

[0054] The DC switch of this application adopts this layout, which can reduce the size of the DC switch along the arrangement direction of multiple switch bodies, so that the DC switch can be used in scenarios where the space along the arrangement direction of multiple switch bodies is limited, or in scenarios where it is inconvenient to assemble a handle or operating handle along the arrangement direction of multiple switch bodies. This arrangement of the DC switch of this application can provide support for the application of DC switch in special scenarios.

[0055] In one implementation, the handle and operating mechanism are arranged in a direction parallel to the side wall, and the arrangement direction of the handle and operating mechanism is parallel to the arrangement direction of the multiple switch bodies.

[0056] This application simplifies the transmission method by arranging the handle, operating mechanism, and multiple switch bodies in the manner described above, with the input shaft and output shaft arranged in parallel. It also reduces the size of the DC switch along the circuit board and sidewall, enabling the power conversion device to be used in scenarios where the size along the circuit board and sidewall is limited, or in scenarios where it is inconvenient to assemble the handle or operating handle along the circuit board and sidewall. Attached Figure Description

[0057] Figure 1 This is a network diagram of a photovoltaic power supply system provided in an embodiment of this application;

[0058] Figure 2This is one of the circuit structure schematic diagrams of the power conversion device provided in the embodiments of this application;

[0059] Figure 3 This is one of the structural schematic diagrams of a DC switch provided in the embodiments of this application;

[0060] Figure 4 This is a schematic diagram of the power conversion device provided in the embodiments of this application;

[0061] Figure 5 for Figure 4 One of the schematic diagrams of a partial structure of a power conversion device in a computer.

[0062] Figure 6 for Figure 5 A schematic diagram of the power conversion circuit, DC switch, circuit board and photovoltaic connector in the image;

[0063] Figure 7 for Figure 5 One of the structural schematic diagrams of DC switches, circuit boards, and photovoltaic connectors in the image;

[0064] Figure 8 for Figure 5 The second schematic diagram of the structure of the DC switch, circuit board and photovoltaic connector in the image;

[0065] Figure 9 for Figure 4 Partial structural schematic diagram of the power conversion device in the middle;

[0066] Figure 10 This is a second schematic diagram of the structure of the DC switch provided in the embodiments of this application;

[0067] Figure 11 for Figure 4 Partial structural schematic diagram of the power conversion device in the middle;

[0068] Figure 12 for Figure 4 Partial structural schematic diagram of the power conversion device in the diagram (Part 4);

[0069] Figure 13 for Figure 4 Partial structural schematic diagram of the power conversion device in the diagram (5);

[0070] Figure 14 A second schematic diagram of the circuit structure of the power conversion device provided in the embodiments of this application;

[0071] Figure 15 This is the third schematic diagram of the structure of the DC switch provided in the embodiments of this application;

[0072] Figure 16This is the fourth schematic diagram of the structure of the DC switch provided in the embodiments of this application;

[0073] Figure 17 for Figure 16 A top view of the DC switch in the middle;

[0074] Figure 18 This is one of the schematic diagrams showing the layout of a circuit board and a DC switch;

[0075] Figure 19 This is the second schematic diagram of the layout structure of the circuit board and DC switch;

[0076] Figure 20 This is the third schematic diagram of the layout structure of the circuit board and DC switch;

[0077] Figure 21 The fourth schematic diagram of the layout structure of the circuit board and DC switch;

[0078] Figure 22 This is the fifth schematic diagram of the layout structure of the circuit board and DC switch;

[0079] Figure 23 This is the sixth schematic diagram of the layout structure of the circuit board and DC switch.

[0080] Figure label:

[0081] 01-Photovoltaic power supply system; 100-Power conversion device; 200-Photovoltaic string;

[0082] 10 - Device housing; 11 - Receiving cavity; 111 - Side wall;

[0083] 20 - Photovoltaic connector; 21 - First photovoltaic connector; 22 - Second photovoltaic connector; 23 - First part; 24 - Second part;

[0084] 30 - DC switch; 301 - First switch; 302 - Second switch;

[0085] 31-Handle;

[0086] 32-Operating mechanism; 321-Second housing; 322-Transmission structure; 323-Input shaft; 324-Output shaft; 3241-Sub-output shaft;

[0087] 33-Switch body; 331-First housing; 332-Moving contact; 333-First stationary contact; 334-Second stationary contact;

[0088] 34-Trip release device; 341-Trip release lever;

[0089] 40 - Grid connection switch;

[0090] 50-Controller;

[0091] 60-Power conversion circuit;

[0092] 70 - Circuit board; 701 - First sub-board; 702 - Second sub-board; 71 - First circuit; 72 - Second circuit;

[0093] 81-First electrical connector; 82-Second electrical connector;

[0094] 91-Current sampling circuit; 92-Filtering circuit; 93-Surge protection circuit; 931-First surge protection circuit; 932-Second surge protection circuit; 94-Arc fault detection circuit; 941-First arc fault detection circuit; 942-Second arc fault detection circuit. Detailed Implementation

[0095] 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.

[0096] The terms "first," "second," and similar terms used in this article do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "one" or similar terms do not indicate a quantity limitation, but rather indicate the existence of at least one.

[0097] In the embodiments of this application, the terms "example" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "example" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of terms such as "example" or "for example" is intended to present the relevant concepts in a specific manner. In the description of the embodiments of this application, unless otherwise stated, "a plurality of" means two or more.

[0098] Figure 1 For a network diagram of the photovoltaic power supply system 01 provided in the embodiments of this application, please refer to... Figure 1The photovoltaic power supply system 01 includes a power conversion device 100 and photovoltaic modules. The power conversion device 100 converts direct current (DC) from the photovoltaic modules into alternating current (AC) and transmits the AC to the grid or a load. For example, the power conversion device 100 includes multiple photovoltaic connectors 20, a DC switch 30, a power conversion circuit 60, DC buses BUS+ and BUS-, a grid-connected switch 40, and a controller 50. The power conversion circuit 60 includes a DC / DC circuit and a DC / AC circuit. In some applications, the photovoltaic modules are connected to the photovoltaic connectors 20 to transmit DC to the DC / DC circuit via the DC switch 30. The DC / DC circuit then transforms the DC to AC and transmits it to the grid or a load via the DC bus.

[0099] Figure 2 This is one of the circuit structure schematic diagrams of the power conversion device 100 provided in the embodiments of this application. In some embodiments, such as... Figure 2 As shown, the power conversion device 100 includes a power conversion circuit 60, a current sampling circuit 91, a filter circuit 92, and a surge protection circuit 93. These circuits are electrically connected between the photovoltaic connector 20 and the DC switch 30. The current sampling circuit 91 measures the DC input current from the photovoltaic string 200 in real time, enabling maximum power point tracking, overcurrent protection, power generation detection, and fault diagnosis. The filter circuit 92 filters out high-frequency noise introduced by wires on the photovoltaic input side of the power conversion device 100 or generated by internal inverter circuitry, reducing the risk of internal noise from the power conversion device 100 being conducted to the outside, or reducing the risk of external noise being conducted into the power conversion device 100. The surge protection circuit 93 (or surge protection circuit) discharges high-energy transient surge voltage / current generated by lightning strikes or the photovoltaic connector 20 side of the power conversion device 100, protecting downstream circuitry from damage.

[0100] Alternatively, for example, the DC switch 30 and the grid-connected switch 40 may each be rotary switches, or the DC switch 30 may be a rotary switch and the grid-connected switch 40 may be a relay. Figure 3 This is one of the structural schematic diagrams of the DC switch 30 provided in the embodiments of this application. Please refer to the following: Figure 1 and Figure 3As shown, for example, the DC switch 30 includes a handle 31, an operating mechanism 32, multiple stacked switch bodies 33, and a trip unit 34. The multiple stacked switch bodies 33 are located on one side of the operating mechanism 32. Each switch body 33 includes a first housing 331 and a moving contact 332 (not shown), a first stationary contact 333, and a second stationary contact 334 housed in the first housing 331. The moving contact 332 rotates relative to the first housing 331, while the first stationary contact 333 and the second stationary contact 334 are respectively fixed relative to the first housing 331. The first stationary contact 333 of each switch body 33 is used to electrically connect to one photovoltaic string 200 or multiple photovoltaic strings 200 connected in parallel. One photovoltaic string 200 includes multiple photovoltaic modules connected in series. The second stationary contact 334 of each switch body 33 is used to electrically connect to the power conversion circuit 60.

[0101] The handle 31 drives the operating mechanism 32, which in turn drives the moving contact 332 of the switch body 33 to move. When the moving contact 332 moves to contact the first stationary contact 333 and the second stationary contact 334 respectively, the DC switch 30 closes. When the moving contact 332 moves to disengage from the first stationary contact 333 and the second stationary contact 334 respectively, the DC switch 30 opens. The trip unit 34 receives the trip signal from the controller 50. When an abnormality occurs in the current flowing through the switch body 33, the trip unit 34 receives the trip signal and causes the switch body 33 of the DC switch 30 to open. For example, when the current flowing through at least one switch body 33 of the DC switch 30 exceeds a set threshold, or when the current flowing through at least one switch body 33 of the DC switch 30 is a reverse current, the controller 50 sends a trip signal to the trip unit 34. Under the action of the trip signal, the trip unit 34 releases the corresponding linkage structure in a timely manner. The linkage structure is used to drive the transmission structure 322 inside the operating mechanism 32 to move. The transmission structure 322 can drive the moving contact 332 of the switch body 33 to move, so that the moving contact 332 of the switch body 33 is disconnected from the first stationary contact 333 and the second stationary contact 334 respectively.

[0102] In some applications, multiple switch bodies 33 are linked together so that they can close or open simultaneously. That is, the operating mechanism 32 can simultaneously drive the moving contacts 332 of all switch bodies 33 to rotate, so that all switch bodies 33 can open or close synchronously.

[0103] In the power conversion device 100, the handle 31 of the DC switch 30 is located outside the device housing 10 for user operation, while the operating mechanism 32 and multiple switch bodies 33 are typically located inside the device housing 10 for easy electrical connection with the power conversion circuit 60 located within the device housing 10. However, in some common layouts, the operating mechanism 32 and multiple switch bodies 33 are typically arranged sequentially along the sidewall 111 of the housing 10, perpendicular to the sidewall 111 of the housing 10. This layout causes the operating mechanism 32 and multiple switch bodies 33 to extend towards the central region of the housing 11, occupying a significant amount of space within the housing 11 along the sidewall 111 perpendicular to the sidewall 111. This restricts the layout space for other components inside the housing, thus limiting the overall layout design of the photovoltaic inverter. Based on this, this application provides a power conversion device 100, which can reduce the occupation of the DC switch 30 in the internal space of the cavity 11 along the direction perpendicular to the side wall 111 of the cavity 11, and facilitate the layout of the power conversion circuit 60 and other devices in the cavity 11.

[0104] The specific structure of the power conversion device 100 provided in this application will be described below.

[0105] Before introducing the power conversion device 100, it should be understood that the power conversion device 100 in this application can be either a photovoltaic inverter or a power conversion system (PCS). Unlike a photovoltaic inverter, the photovoltaic connector 20 of the power conversion system can be connected not only to photovoltaic modules but also to energy storage batteries. Therefore, the power conversion system can not only convert DC power from photovoltaic modules or energy storage batteries into AC power, but also rectify AC power from the grid into DC power to charge energy storage, thereby improving the energy utilization efficiency of the power supply system. For ease of understanding and explanation, the power conversion device 100 described below is illustrated using a photovoltaic inverter as an example.

[0106] Figure 4 This is a schematic diagram of the power conversion device 100 provided in the embodiments of this application. Please refer to the following: Figure 1 and Figure 4 As shown, the power conversion device 100 includes a device housing 10, a photovoltaic connector 20, a circuit board 70, a DC switch 30, and a power conversion circuit 60.

[0107] The housing 10 includes a cavity 11, which accommodates at least a portion of the photovoltaic connector 20, the circuit board 70, at least a portion of the DC switch 30, and the power conversion circuit 60. Alternatively, when the power conversion device 100 also includes circuit structures or devices such as a current sampling circuit 91, a filter circuit 92, and a lightning protection circuit 93, the cavity 11 may also accommodate these components.

[0108] Please refer to Figure 1 and Figure 4 As shown, one end of the photovoltaic connector 20 is fixed to the outside of the device housing 10 and is used for electrical connection with the photovoltaic string 200. The other end of the photovoltaic connector 20 passes through the device housing 10 and extends into the receiving cavity 11. The part of the photovoltaic connector 20 extending into the receiving cavity 11 is used for electrical connection with the circuit board 70 located in the receiving cavity 11.

[0109] For example, the device housing 10 has a through hole for a photovoltaic connector 20 to pass through. One end of the photovoltaic connector 20 is located outside the device housing 10 to facilitate electrical connection with a photovoltaic string 200 outside the device housing 10, and the other end extends through the through hole into the receiving cavity 11 and is electrically connected to the circuit board 70 located in the receiving cavity 11.

[0110] The circuit board 70 is located within the accommodating cavity 11, and the surface of the circuit board 70 is fixed to the side wall 111 of the accommodating cavity 11. That is, the circuit board 70 is fixed to the side wall 111 of the accommodating cavity 11. In this embodiment, the side wall 111 of the accommodating cavity 11 refers to the inner peripheral wall of the accommodating cavity 11. For example, the power conversion device 100 includes a power board, and the power conversion circuit 60 is integrated on the power board. The surface of the power board is perpendicular to the surface of the circuit board 70. It is understood that perpendicularity in this application includes absolute perpendicularity and approximately perpendicularity; similarly, horizontality in this application includes absolute parallelism and approximately parallelism.

[0111] The circuit board 70 is equipped with a surge protection circuit 93. The input terminal of the surge protection circuit 93 is electrically connected between the photovoltaic connector 20 and the first stationary contact 333 of the DC switch 30 (the first stationary contact 333 will be described in detail below), and the output terminal of the surge protection circuit 93 is grounded. By setting up the surge protection circuit 93, and making the input terminal of the surge protection circuit 93 connected between the photovoltaic connector 20 and the first stationary contact 333 of the DC switch 30, and the output terminal grounded, this application can resist the instantaneous overvoltage impact (such as lightning-induced surge) generated on the photovoltaic connector 20 side, and protect the electronic components inside the power conversion device 100 from damage.

[0112] In addition, by placing the surge protection circuit 93 on the circuit board 70, this application can make effective use of the circuit board 70. Compared with placing the surge protection circuit 93 on the power board of the power conversion device 100 (i.e. the circuit board where the power conversion circuit 60 is located) or other circuit boards, the number of wiring cables for the surge protection circuit 93 is reduced, and the occupancy of the wiring cables of the surge protection circuit 93 in the direction perpendicular to the side wall 111 of the internal space of the accommodating cavity 11 is reduced. This can reduce the wiring complexity of the surge protection circuit 93 and improve the compactness of the layout structure.

[0113] like Figure 4 As shown, the DC switch 30 includes a handle 31, an operating mechanism 32, and multiple switch bodies 33 stacked together; wherein, the handle 31 is connected to the outside of the device housing 10. The operating mechanism 32 and the multiple switch bodies 33 are all fixed inside the receiving cavity 11. In this application, connecting the handle to the outside of the device housing 10 allows the user to control the opening or closing of the DC switch 30 via the handle 31 from outside the device housing 10. Fixing the operating mechanism 32 and the multiple switch bodies 33 inside the receiving cavity 11 can protect the operating mechanism 32 and the multiple switch bodies 33, and also allows the DC switch 30 to be electrically connected to the photovoltaic string 200 and the power conversion circuit 60 via the switch bodies 33.

[0114] In this embodiment, as Figure 4 As shown, the arrangement direction of the multiple switch bodies 33 is parallel to the side wall 111.

[0115] In the power conversion device 100 provided in this application, since the arrangement direction of the plurality of switch bodies 33 of the DC switch 30 is parallel to the side wall 111, and in the DC switch 30, generally the size of the DC switch 30 in the arrangement direction of the plurality of switch bodies 33 is significantly larger than the size in other directions perpendicular to this direction (i.e., in... Figure 4 In the orientation shown, the vertical dimension of the DC switch 30 is generally larger than its dimensions in other directions. Therefore, by arranging the multiple switch bodies 33 of the DC switch 30 in a parallel direction relative to the sidewall 111, this application can reduce the size of the DC switch 30 extending into the cavity 11 along the direction perpendicular to the sidewall 111, thereby reducing the space occupied by the DC switch 30 in the cavity 11 in the direction perpendicular to the sidewall 111. By arranging the DC switch 30 in the cavity 11 as described above and by placing the surge protection circuit 93 on the circuit board 70, the power conversion device 100 of this application can reduce the encroachment of the DC switch 30 and surge protection circuit 93 on the layout space of other devices in the cavity 11 along the direction perpendicular to the sidewall 111, thereby achieving a compact device layout structure of the power conversion device 100. This facilitates the layout of the power conversion circuit 60 and other related devices in the cavity 11, and makes the overall layout design of the power conversion device 100 easier.

[0116] Each switch body 33 of the DC switch 30 includes a moving contact 332, a first stationary contact 333, and a second stationary contact 334. The moving contact 332 is connected to the operating mechanism 32. The first stationary contact 333 and the second stationary contact 334 are fixed relative to the device housing 10. The first stationary contact 333 of each switch body 33 is electrically connected to the circuit board 70 and is electrically connected to the photovoltaic connector 20 through the circuit board 70. The second stationary contact 334 of each switch body 33 is electrically connected to the power conversion circuit 60. The handle 31 is used to drive the moving contact 332 to rotate through the operating mechanism 32, so that the moving contact 332 of each switch body 33 is connected or disconnected from the first stationary contact 333 and the second stationary contact 334.

[0117] In this application, by turning the handle 31 located outside the device housing 10, the operating mechanism 32 located inside the device housing 10 is driven to operate. The operating mechanism 32 can drive the moving contact 332 of each switch body 33 to rotate, thereby connecting or disconnecting the moving contact 332 of each switch body 33 with the first stationary contact 333 and the second stationary contact 334 of the corresponding switch body 33. When the moving contact 332 is connected to the first stationary contact 333 and the second stationary contact 334, the photovoltaic connector 20 can achieve electrical connection with the power conversion circuit 60 through the circuit board 70 and the DC switch 30; when the moving contact 332 is disconnected from the first stationary contact 333 and the second stationary contact 334, the photovoltaic connector 20 is disconnected from the power conversion circuit 60.

[0118] For example, the DC switch 30 can be directly fixed to the side wall 111 of the accommodating cavity 11, or it can be indirectly fixed to the side wall 111 of the accommodating cavity 11. For example, the DC switch 30 is indirectly fixed to the side wall 111 of the accommodating cavity 11 by fixing it to the circuit board 70. The two fixing methods of the DC switch 30 will be described below by way of example.

[0119] (1) The first fixing method of DC switch 30: the operating mechanism 32 and multiple switch bodies 33 are all fixed on the side of the circuit board 70 away from the side wall 111. The first stationary contact 333 of each switch body 33 is electrically connected to the circuit board 70, and the second stationary contact 334 of each switch body 33 is electrically connected to the power conversion circuit 60 through the second electrical connector 82.

[0120] That is, the handle 31 of the DC switch 30 is connected to the outside of the device housing 10, and the operating mechanism 32 and multiple switch bodies 33 of the DC switch 30 are directly fixed to the side of the circuit board 70 away from the side wall 111. In this way, the electrical connection path between the first stationary contact 333 of the DC switch 30 and the circuit board 70 can be shortened. On the one hand, the cable length between the first stationary contact 333 and the circuit board 70 can be shortened, reducing wiring costs. On the other hand, the structural compactness within the accommodating cavity 11 can be improved, reducing the space occupied by the input cable of the DC switch 30 in the accommodating cavity 11, so as to reserve more space to accommodate the power conversion circuit 60 or other electronic circuits or devices.

[0121] For example, the second electrical connector 82 can be a cable or a copper busbar.

[0122] This application does not restrict the electrical connection method between the first stationary contact 333 of the DC switch 30 and the circuit board 70. For example, a copper busbar can be used to achieve the wiring. For instance, the circuit board 70's lines can be led out to the first stationary contact 333 through the copper busbar, and the copper busbar and the first stationary contact 333 can be soldered to make the first stationary contact 333 and the lines on the circuit board 70 electrically connected to the first stationary contact 333. Alternatively, a combination of a copper busbar and screws can be used to achieve the wiring. For instance, the circuit board 70's lines can be led out to the first stationary contact 333 through the copper busbar, and the copper busbar and the first stationary contact 333 can be fixed with screws. Alternatively, a combination of saddle terminals and screws can be used to achieve the wiring. For instance, the circuit board 70's lines can be led out to the first stationary contact 333 through the saddle terminals, and the saddle terminals and the first stationary contact 333 can be fixed with screws. Alternatively, the second stationary contact 334 and the power conversion circuit 60 can be connected by a cable.

[0123] For example, the first stationary contact 333 can also be fixed to the circuit board 70 by welding, and the first stationary contact 333 is fixedly connected to the circuit of the circuit board 70. That is, in one implementation, each switch body 33 includes a first housing 331, the moving contact 332 is located inside the first housing 331, and the first stationary contact 333 and the second stationary contact 334 are each partially located inside the first housing 331 and partially exposed from the first housing 331. The portion of the first stationary contact 333 exposed in the first housing 331 and the portion of the second stationary contact 334 exposed in the first housing 331 in each switch body 33 are located on different sides of the first housing 331; and the portion of the first stationary contact 333 exposed in the first housing 331 in each switch body 33 is located on the side of the first housing 331 facing the circuit board 70 and is welded to the circuit board 70.

[0124] The portion of the first stationary contact 333 exposed outside the first housing 331 is used for electrical connection with the circuit board 70, and the portion of the second stationary contact 334 exposed outside the first housing 331 is used for electrical connection with the power conversion circuit 60.

[0125] This application places the portion of the first stationary contact 333 exposed in the first housing 331 of each switch body 33 on the side of the first housing 331 facing the circuit board 70 and welded to the circuit board 70. In this way, when the switch body 33 is fixed to the side of the circuit board 70 away from the side wall 111, the switch body 33 can be directly fixed to the wiring of the circuit board 70 by welding, which can eliminate the need for the connecting cable (i.e., input cable) and related power distribution components between the circuit board 70 and the first stationary contact 333. Firstly, it saves costs; secondly, it simplifies the electrical connection wiring, making the wiring of the power conversion device 100 neater, and avoids the input cable occupying the internal space of the accommodating cavity 11, which is beneficial to the layout of the devices in the accommodating cavity 11; thirdly, it can reduce the wiring difficulty of the DC switch 30 and the circuit board 70, improve the assembly efficiency of the power conversion device 100, increase manufacturing capacity (Units Per Hour, UPH), and reduce the operational complexity during maintenance and repair, and reduce the probability of errors.

[0126] Furthermore, the portion of the first stationary contact 333 exposed in the first housing 331 and the portion of the second stationary contact 334 exposed in the first housing 331 of each switch body 33 are located on different sides of the first housing 331. This means that the portion of the second stationary contact 334 exposed in the first housing 331 is not located on the side of the first housing 331 facing the circuit board 70. Thus, when multiple switch bodies 33 are fixed to the circuit board 70, at least a portion of the second stationary contact 334 can be exposed from the circuit board 70, which facilitates the electrical connection between the second stationary contact 334 and the power conversion circuit 60 through the second electrical connector 82.

[0127] For example, the portion of the first stationary contact 333 exposed in the first housing 331 and the portion of the second stationary contact 334 exposed in the first housing 331 in each switch body 33 are located on adjacent sides of the first housing 331; or, the portion of the first stationary contact 333 exposed in the first housing 331 and the portion of the second stationary contact 334 exposed in the first housing 331 in each switch body 33 are located on opposite sides of the first housing 331.

[0128] Furthermore, the portions of the second stationary contacts 334 exposed in the first housing 331 of different switch bodies 33 can be located on the same side of the first housing 331 or on different sides of the first housing 331. For example, the portions of the second stationary contacts 334 exposed in the first housing 331 of all switch bodies 33 are located on the side of the first housing 331 away from the circuit board 70; or, the portions of the second stationary contacts 334 exposed in the first housing 331 of all switch bodies 33 are located on the side of the first housing 331 perpendicular to the side wall 111; or, the portions of the second stationary contacts 334 exposed in the first housing 331 of some switch bodies 33 are located on the side of the first housing 331 away from the circuit board 70, and the portions of the second stationary contacts 334 exposed in the first housing 331 of other switch bodies 33 are located on the side of the first housing 331 perpendicular to the side wall 111.

[0129] It is understood that in the power conversion device 100 of this application, the DC switch 30 may include only one switch or multiple switches. When the DC switch 30 includes only one switch, each photovoltaic connector 20 is electrically connected to the power conversion circuit 60 through the circuit board 70 and the corresponding switch body 33 of the DC switch 30; when the DC switch 30 includes multiple switches, a portion of the multiple photovoltaic connectors 20 is electrically connected to the power conversion circuit 60 through the circuit board 70 and the corresponding switch body 33 of one of the DC switches 30, and another portion of the multiple photovoltaic connectors 20 is electrically connected to the power conversion circuit 60 through the circuit board 70 and the corresponding switch body 33 of another DC switch 30.

[0130] Figure 5 for Figure 4 One of the partial structural schematic diagrams of the power conversion device 100 in the diagram. Figure 6 for Figure 5 The diagram shows the structure of the power conversion circuit 60, DC switch 30, circuit board 70, and photovoltaic connector 20. When the DC switch 30 includes multiple switches, please refer to... Figure 5 and Figure 6 The DC switch 30 includes a first switch 301 and a second switch 302 spaced apart. The photovoltaic connector 20 includes a plurality of photovoltaic connectors. A portion of the plurality of photovoltaic connectors 20 is electrically connected to the first switch 301 via a circuit board 70, and another portion of the plurality of photovoltaic connectors 20 is electrically connected to the second switch 302 via a circuit board 70.

[0131] That is, a portion of the multiple photovoltaic connectors 20 are electrically connected to the first switch 301 via the circuit board 70, and another portion of the multiple photovoltaic connectors 20 are electrically connected to the second switch 302 via the circuit board 70. This application designs the DC switch 30 as a modular structure including the first switch 301 and the second switch 302. This modular design can effectively utilize the installation space on the circuit board 70 and improve the space utilization rate on the circuit board 70. In addition, the first switch 301 and the second switch 302 can be installed in a distributed manner according to the physical interface position of the corresponding photovoltaic connector 20, reducing the distance between the switch and the photovoltaic connector 20, thereby shortening the wiring length on the circuit board 70 used for electrically connecting the corresponding switch and the photovoltaic connector 20. This improves the wiring redundancy required for the centralized large-volume DC switch 30, avoids or reduces the crossing of copper busbars or cables inside the housing cavity 11, and facilitates the neat wiring of the power conversion device 100.

[0132] For example, such as Figure 5 and Figure 6 As shown, the first switch 301 is located near one edge of the circuit board 70, and the second switch 302 is located near the other edge of the circuit board 70.

[0133] In addition, in this embodiment, the DC switch 30 may include only the first switch 301 and the second switch 302, or it may include a third switch in addition to the first switch 301 and the second switch 302. When the DC switch 30 also includes a third switch, for example, a portion of the plurality of photovoltaic connectors 20 are electrically connected to the first switch 301 through the circuit board 70, another portion of the plurality of photovoltaic connectors 20 are electrically connected to the second switch 302 through the circuit board 70, and yet another portion of the plurality of photovoltaic connectors 20 are electrically connected to the third switch through the circuit board 70. When the DC switch 30 includes three or more switches, the distribution relationship of the plurality of switches can be determined according to the distribution position of the plurality of connectors.

[0134] Figure 18 This is one of the layout diagrams of circuit board 70 and DC switch 30. Please refer to it for further details. Figure 5 and Figure 18 As shown, in one implementation, the arrangement direction of the plurality of switch bodies 33 of the first switch 301 and the arrangement direction of the plurality of switch bodies 33 of the second switch 302 are both perpendicular to the bottom surface of the accommodating cavity 11; the surge protection circuit 93 is located between the first switch 301 and the second switch 302; the plurality of photovoltaic connectors 20 include a first part 23 and a second part 24, wherein the projection of the first part 23 on the side of the circuit board 70 facing away from the side wall 111 is located between the first switch 301 and the surge protection circuit 93, and the projection of the second part 24 on the side of the circuit board 70 facing away from the side wall 111 is located between the second switch 302 and the surge protection circuit 93.

[0135] The projection of the first part 23 on the side of the circuit board 70 facing away from the side wall 111 is shown below. Figure 18 The left dashed box in the image shows the projection of the second part 24 onto the side of the circuit board 70 facing away from the side wall 111. Figure 18 The dashed box on the right side of the text.

[0136] By positioning the surge protection circuit 93 between the first portion 23 and the second portion 24 of the multiple photovoltaic connectors 20, i.e., by placing the surge protection circuit 93 between the two portions of the multiple photovoltaic connectors 20, the surge protection circuit 93 is located close to both the first portion 23 and the second portion 24 of the multiple photovoltaic connectors 20. When the photovoltaic connectors 20 generate a momentary large voltage or large current, the surge protection circuit 93 can respond quickly and conduct and discharge it, thereby protecting the internal circuit of the power conversion device 100 from damage or reducing the damage to the internal circuit of the power conversion device 100.

[0137] Figure 19 This is the second schematic diagram showing the layout of circuit board 70 and DC switch 30. Please refer to it for further information. Figure 5 and Figure 19 In one implementation, the circuit board 70 is further provided with a first arc fault detection circuit 941 and a second arc fault detection circuit 942. The first arc fault detection circuit 941 is electrically connected between the first part 23 and the first switch 301, and the second arc fault detection circuit 942 is electrically connected between the second part 24 and the second switch 302. The first arc fault detection circuit 941 is located between the projection of the first part 23 on the side of the circuit board 70 facing away from the side wall 111 and the first switch 301, and the second arc fault detection circuit 942 is located between the projection of the second part 24 on the side of the circuit board 70 facing away from the side wall 111 and the second switch 302.

[0138] The Arc Fault Circuit Interrupter (AFCI) circuit is a safety protection circuit in the power conversion device 100. It is used to detect and sample arc signals to interrupt dangerous arcs caused by wire damage, poor connections, etc., thus preventing fires caused by arc faults in the power conversion device 100. In addition to detecting and sampling arc signals, this arc fault detection circuit also has a self-test function. That is, it can simulate arc signals to check whether the arc fault detection circuit is working properly, preventing malfunctions.

[0139] This application places the first arc fault detection circuit 941 and the second arc fault detection circuit 942 on the circuit board 70, and makes both the first arc fault detection circuit 941 and the second arc fault detection circuit 942 electrically connected between the corresponding switch and the portion of the multiple photovoltaic connectors 20. The first arc fault detection circuit 941 and the second arc fault detection circuit 942 adopt this layout, which makes them closer to the photovoltaic connectors 20. This can, to a certain extent, prevent the detection signal from being attenuated, distorted or interfered with due to the long line transmission path, and is conducive to improving the detection accuracy of the arc fault detection circuit in detecting whether there is an arcing phenomenon near the photovoltaic connectors 20.

[0140] Furthermore, this application places the first arc fault detection circuit 941 and the second arc fault detection circuit 942 on the circuit board 70. Compared to placing the first arc fault detection circuit 941 and the second arc fault detection circuit 942 on the circuit board 70 on other circuit boards or power boards, this can reduce the number of wires connected to the corresponding photovoltaic connector 20 and switch, simplify the circuit structure, and reduce the space occupied by the first arc fault detection circuit 941 and the second arc fault detection circuit 942 in the accommodating cavity 11 due to wiring. This is beneficial for the effective utilization of the space of the circuit board 70 and achieves a compact structure of the power conversion device 100.

[0141] In some embodiments, when the DC switch 30 includes a first switch 301 and a second switch 302, the first switch 301 and the second switch 302 can be fixed on a single circuit board 70, or they can be fixed on different circuit boards 70 respectively.

[0142] For example, Figure 7 for Figure 5 One of the structural schematic diagrams of the DC switch 30, circuit board 70, and photovoltaic connector 20 in the diagram. Figure 8 for Figure 5 The second schematic diagram of the structure of the DC switch 30, circuit board 70 and photovoltaic connector 20 is shown below. Figure 7 and Figure 8 As shown, the operating mechanism 32 and multiple switch bodies 33 of the first switch 301, as well as the operating mechanism 32 and multiple switch bodies 33 of the second switch 302, are all fixed to the side of the circuit board 70 facing away from the side wall 111. That is, the first switch 301 and the second switch 302 are simultaneously fixed on the same circuit board 70, which is a single piece of board. By fixing the first switch 301 and the second switch 302 on the same circuit board 70, this application can reduce the number of components in the power conversion device 100, reduce the difficulty of component assembly, and improve production efficiency.

[0143] For example, Figure 9for Figure 4 The second partial structural schematic diagram of the power conversion device 100 in the diagram is shown below. Figure 9 As shown, the circuit board 70 includes a first sub-board 701 and a second sub-board 702 spaced apart. The surfaces of both the first sub-board 701 and the second sub-board 702 are fixed to the side wall 111. The operating mechanism 32 and multiple switch bodies 33 of the first switch 301 are fixed to the side of the first sub-board 701 facing away from the side wall 111; the operating mechanism 32 and multiple switch bodies 33 of the second switch 302 are fixed to the side of the second sub-board 702 facing away from the side wall 111.

[0144] That is, the circuit board 70 may include two spaced-apart boards (a first sub-board 701 and a second sub-board 702, respectively), the surfaces of both sub-boards being fixed to the side wall 111. The first switch 301 is fixed to the first sub-board 701, and the second switch 302 is fixed to the second sub-board 702. At this time, a portion of the plurality of photovoltaic connectors 20 is electrically connected to the first sub-board 701 and, through the first sub-board 701, is electrically connected to the first switch 301; another portion of the plurality of photovoltaic connectors 20 is electrically connected to the second sub-board 702 and, through the second sub-board 702, is electrically connected to the second switch 302.

[0145] This application divides the circuit board 70 into a first sub-board 701 and a second sub-board 702 with intervals, and fixes the first switch 301 and the second switch 302 to different sub-boards respectively. Since a single sub-board only needs to support the corresponding switch located on the sub-board, and does not need to support all the switches, the size of a single sub-board can be reduced. Compared with all switches being fixed on the same sub-board, this can improve to a certain extent the problem of insufficient rigidity and reduced structural reliability caused by the excessive size of the single board.

[0146] Figure 20 This is the third schematic diagram showing the layout of circuit board 70 and DC switch 30. When circuit board 70 is divided into a first sub-board 701 and a second sub-board 702 with intervals, in one implementation, please refer to the reference diagram. Figure 9 and Figure 20 As shown, the surge protection circuit 93 includes a first surge protection circuit 931 and a second surge protection circuit 932. The first surge protection circuit 931 is disposed on the first sub-board 701, and its input terminal is electrically connected between the first switch 301 and the photovoltaic connector 20 electrically connected to the first sub-board 701. The output terminal of the first surge protection circuit 931 is grounded. The second surge protection circuit 932 is disposed on the second sub-board 702, and its input terminal is electrically connected between the second switch 302 and the photovoltaic connector 20 electrically connected to the second sub-board 702. The output terminal of the second surge protection circuit 932 is grounded.

[0147] When the first switch 301 is fixed on the first sub-board 701 and the second switch 302 is fixed on the second sub-board 702, by setting the first surge protection circuit 931 on the first sub-board 701 and the second surge protection circuit 932 on the second sub-board 702, it can respectively resist the instantaneous overvoltage impact generated on the photovoltaic connector 20 side on the first sub-board 701 and the instantaneous overvoltage impact generated on the photovoltaic connector 20 side on the second sub-board 702, so as to protect the electronic components inside the power conversion device 100 from damage.

[0148] When the first surge protection circuit 931 is disposed on the first sub-board 701 and the second surge protection circuit 932 is disposed on the second sub-board 702, in one implementation, the surge protection circuit 93 further includes a conductive element. The output terminal of the second surge protection circuit 932 is electrically connected to the output terminal of the first surge protection circuit 931 via the conductive element; or, the output terminal of the first surge protection circuit 931 is electrically connected to the output terminal of the second surge protection circuit 932 via the conductive element.

[0149] The conductive component can be a wire or a copper busbar, etc.

[0150] When the output terminal of the second surge protection circuit 932 is electrically connected to the output terminal of the first surge protection circuit 931 through a conductive element, for example, the output terminal of the first surge protection circuit 931 has a terminal block, and the output terminal of the second surge protection circuit 932 is electrically connected to the terminal block through a conductive element, and the terminal block is grounded.

[0151] When the output terminal of the first surge protection circuit 931 is electrically connected to the output terminal of the second surge protection circuit 932 through a conductive element, for example, the output terminal of the second surge protection circuit 932 has a terminal block, and the output terminal of the first surge protection circuit 931 is electrically connected to the terminal block through a conductive element, and the terminal block is grounded.

[0152] By setting conductive components, this application enables the first lightning protection circuit 931 located on the first sub-board 701 and the second lightning protection circuit 932 located on the second sub-board 702 to share some circuit structures. On the one hand, it can simplify the circuit structure of the lightning protection circuit 93, thereby simplifying the internal circuit structure of the power conversion device 100; on the other hand, it can reduce costs and facilitate the industrialization of the power conversion device 100.

[0153] Furthermore, in the power conversion device 100 of this application, such as Figure 4 As shown, the multiple switch bodies 33 of the DC switch 30 can all be disposed on the same side of the operating mechanism 32; or, Figure 10 This is a second schematic diagram of the structure of the DC switch 30 provided in the embodiments of this application, as shown below. Figure 10As shown, a portion of the multiple switch bodies 33 is disposed on one side of the operating mechanism 32, and another portion is disposed on the other side of the operating mechanism 32. That is, in one implementation, referring to the reference... Figure 4 and Figure 10 As shown, along the direction parallel to the side wall 111, the operating mechanism 32 has partial switch bodies 33 on both opposite sides.

[0154] When a portion of the multiple switch bodies 33 is disposed on one side of the operating mechanism 32 and another portion is disposed on the other side of the operating mechanism 32, the operating mechanism 32 includes an input shaft 323 and two sub-output shafts 3241. The input shaft 323 is fixed to the handle 31. The moving contact 332 of the switch body 33 located on one side of the operating mechanism 32 is connected to the input shaft 323 via one of the sub-output shafts 3241, and the moving contact 332 of the switch body 33 located on the other side of the operating mechanism 32 is connected to the input shaft 323 via the other sub-output shaft 3241.

[0155] In this way, the handle 31 drives the input shaft 323 to rotate, and the input shaft 323 can drive the two sub-output shafts 3241 to rotate respectively. One sub-output shaft 3241 drives the moving contact 332 of the switch body 33 located on one side of the operating mechanism 32 to rotate, opening or closing the circuit with its corresponding first stationary contact 333 and second stationary contact 334. The other sub-output shaft 3241 drives the moving contact 332 of the switch body 33 on the other side of the operating mechanism 32 to rotate, opening or closing the circuit with its corresponding first stationary contact 333 and second stationary contact 334, thereby realizing the opening and closing of multiple switch bodies 33. This application provides at least some switch bodies 33 on both opposite sides of the operating mechanism 32, and provides two sub-output shafts 3241. The two sub-output shafts 3241 can respectively drive the switch bodies 33 on both sides of the operating mechanism 32 to open or close the circuit. Thus, two sets of switch bodies 33 can be controlled through one operating mechanism 32.

[0156] For example, the two sub-output shafts 3241 can be an integral structure; or, the two sub-output shafts 3241 can be separate independent components, and the two sub-output shafts 3241 can be driven synchronously by the input shaft 323 to realize the synchronous opening or closing of the switch body 33 on different sides of the operating mechanism 32.

[0157] Figure 11 for Figure 4 The third schematic diagram of a portion of the power conversion device 100 in the diagram shows that... Figure 11 The DC switch 30 in the middle uses Figure 10 The structural form in it, due to Figure 10The DC switch 30 in the circuit has multiple switch bodies 33 on both opposite sides of the operating mechanism 32. Therefore, it is equivalent to integrating two DC switches 30 into one DC switch 30. In this way, compared with the combination of two independent DC switches 30, the integrated DC switch 30 can save a set of operating mechanisms 32 through the shared mechanism of the operating mechanism 32. It can reduce the overall volume of the DC switch 30 while achieving the same electrical connection function, and reduce the area occupied by the DC switch 30 on the circuit board 70, thereby reducing the size of the circuit board 70. In addition, the integrated DC switch 30 can be fixed on a circuit board 70. Compared with the arrangement of two independent DC switches 30 on a circuit board 70, the integrated DC switch 30 can improve the problem of insufficient rigidity when the size of the circuit board 70 is too large.

[0158] Figure 21 This is the fourth schematic diagram showing the layout of circuit board 70 and DC switch 30. When DC switch 30 adopts... Figure 11 When considering the structure in the code, in one implementation, please combine... Figure 11 and Figure 21 As shown, the arrangement direction of the multiple switch bodies 33 of the DC switch 30 is relative to the accommodating cavity 11. Figure 11 and Figure 21 The bottom surface of the photovoltaic connector 20 (not shown) is parallel to the bottom surface of the accommodating cavity 11. The arrangement direction of the photovoltaic connector 20 and the DC switch 30 is perpendicular to the bottom surface of the accommodating cavity 11. The lightning protection circuit 93 is located on the side of the photovoltaic connector 20 away from the DC switch 30.

[0159] Because the arrangement direction of the multiple switch bodies 33 of the DC switch 30 is parallel to the bottom surface of the accommodating cavity 11, the dimensions of the DC switch 30 in the direction parallel to the bottom surface of the accommodating cavity 11 on the circuit board 70 (i.e., Figure 21 Since the horizontal direction (as shown) occupies a large area, this application arranges the photovoltaic connector 20 and the DC switch 30 in a direction perpendicular to the bottom surface of the accommodating cavity 11, and places the surge protection circuit 93 on the side of the photovoltaic connector 20 away from the DC switch 30. In this way, the layout of the surge protection circuit 93 can increase the rigidity of the circuit board 70 and improve the structural reliability of the circuit board 70.

[0160] Please continue to combine Figure 11 and Figure 21 The circuit board 70 is also provided with an arc fault detection circuit 94, which is electrically connected between the photovoltaic connector 20 and the DC switch 30. The arc fault detection circuit 94 includes a first arc fault detection circuit and a second arc fault detection circuit, which are located on opposite sides of the DC switch along the arrangement direction of the multiple switch bodies of the DC switch.

[0161] This application, by setting up an arc fault detection circuit 94, can detect whether there is arcing near the photovoltaic connector 20, which helps to improve the operational reliability of the power conversion device 100. For the function of the arc fault detection circuit 94 and the technical effects of setting the arc fault detection circuit 94 on the circuit board 70, please refer to the preceding description; to avoid redundancy, it will not be repeated here.

[0162] By setting the first arc fault detection circuit 941 and the second arc fault detection circuit 942 of the arc fault detection circuit 94 on opposite sides of the DC switch 30 along the arrangement direction of the multiple switch bodies 33 of the DC switch 30 (i.e., in... Figure 21 In the indicated orientation, the first arc fault detection circuit 941 and the second arc fault detection circuit 942 are respectively set on the left and right sides of the DC switch 30, which can effectively utilize the space of the DC switch 30 along the arrangement direction of multiple switch bodies 33, and improve the space utilization rate on the circuit board 70.

[0163] (2) The second fixing method of DC switch 30: Figure 12 for Figure 4 This is the fourth partial structural schematic diagram of the power conversion device 100 in the diagram. Please refer to it for further information. Figure 4 and Figure 12 The operating mechanism 32 and multiple switch bodies 33 are all fixed to the side wall 111, and the first stationary contact 333 of each switch body 33 is connected to the first electrical connector 81. Figure 4 and Figure 12 (Not shown in the image) is electrically connected to the circuit board 70, and the second stationary contact 334 of each switch body 33 is connected to the circuit board 70 via the second electrical connector 82. Figure 4 and Figure 12 (Not shown in the image) is electrically connected to the power conversion circuit 60.

[0164] That is, in addition to directly fixing the operating mechanism 32 and multiple switch bodies 33 to the circuit board 70, the DC switch 30 can also, as Figure 12 As shown, the operating mechanism 32 and multiple switch bodies 33 are directly fixed to the side wall 111 of the accommodating cavity 11. This application's direct fixing of the operating mechanism 32 and multiple switch bodies 33 of the DC switch 30 to the side wall 111 of the accommodating cavity 11 also reduces the encroachment of the DC switch 30 on the layout space of other devices within the accommodating cavity 11 along a direction perpendicular to the side wall 111, facilitating the layout of the power conversion circuit 60 and other related devices within the accommodating cavity 11.

[0165] The first electrical connector 81 and the second electrical connector 82 can be cables, copper busbars, a combination of copper busbars and screws, or a combination of saddle terminals and screws, etc. For the relevant connection methods, please refer to the description of the second electrical connector 82 in the first fixing method of the DC switch 30 above. To avoid redundancy, this application will not repeat the description here. Furthermore, the structural forms of the first electrical connector 81 and the second electrical connector 82 can be the same or different.

[0166] When the operating mechanism 32 and multiple switch bodies 33 of the DC switch 30 are all fixed to the side wall 111, the DC switch 30 can similarly include one switch, two or more independent switches, or two switches can be integrated together to form one switch.

[0167] For example, Figure 13 for Figure 4 The fifth schematic diagram of a partial structure of the power conversion device 100 in the diagram shows one implementation, such as... Figure 13 As shown, the DC switch 30 includes a first switch 301 and a second switch 302 spaced apart. The photovoltaic connector 20 includes a plurality of photovoltaic connectors. A portion of the plurality of photovoltaic connectors 20 is electrically connected to the first switch 301 through the circuit board 70 and the first electrical connector 81, and another portion of the plurality of photovoltaic connectors 20 is electrically connected to the second switch 302 through the circuit board 70 and the first electrical connector 81.

[0168] A portion of the multiple photovoltaic connectors 20 are electrically connected to the first switch 301 via the circuit board 70 and the first electrical connector 81, and another portion of the multiple photovoltaic connectors 20 are electrically connected to the second switch 302 via the circuit board 70 and the first electrical connector 81. This application designs the DC switch 30 as a modular structure including at least two parts: the first switch 301 and the second switch 302. The first switch 301 and the second switch 302 can be installed in a distributed manner according to the physical interface position of the corresponding photovoltaic connector 20 (for example, the first switch 301 and the second switch 302 are fixed on opposite sides of the circuit board 70 respectively), reducing the distance between each switch and the corresponding photovoltaic connector 20 electrically connected to it. This shortens the routing length of the circuit board 70 used for electrically connecting the corresponding photovoltaic terminal and the first electrical connector 81, and also shortens the routing length of the corresponding first electrical connector 81, which is conducive to the neat wiring of the power conversion device 100.

[0169] When both the first switch 301 and the second switch 302 are fixed to the side wall 111, the same principle applies as when both the first switch 301 and the second switch 302 are fixed as a whole to the circuit board 70. Figure 22 This is the fifth schematic diagram showing the layout of circuit board 70 and DC switch 30, in conjunction with reference. Figure 13 and Figure 22As shown, the arrangement direction of the multiple switch bodies 33 of the first switch 301 and the multiple switch bodies 33 of the second switch 302 are both perpendicular to the bottom surface of the accommodating cavity 11; the surge protection circuit 93 is located between the first switch 301 and the second switch 302; the photovoltaic connector 20 includes a first part 23 and a second part 24, wherein the projection of the first part 23 on the side of the circuit board 70 facing away from the side wall 111 is located between the first switch 301 and the surge protection circuit 93, and the projection of the second part 24 on the side of the circuit board 70 facing away from the side wall 111 is located between the second switch 302 and the surge protection circuit 93.

[0170] The projection of the first part 23 on the side of the circuit board 70 facing away from the side wall 111 is shown below. Figure 22 The left dashed box in the image shows the projection of the second part 24 onto the side of the circuit board 70 facing away from the side wall 111. Figure 22 The dashed box on the right side of the text.

[0171] in addition, Figure 13 For ease of viewing and understanding, cavity 11 ( Figure 13 The bottom surface (not shown in the diagram) and the plane containing the circuit board 70 are shown on the same plane, wherein the plane containing the bottom surface of the accommodating cavity 11 is... Figure 13 The plane shown in the largest rectangle should be understood to be perpendicular or nearly perpendicular to the plane where the accommodating cavity 11 is located and the circuit board 70 is located.

[0172] By positioning the surge protection circuit 93 between the projection of the first portion 23 of the multiple photovoltaic connectors 20 onto the side of the circuit board 70 facing away from the sidewall 111 and the projection of the second portion 24 of the multiple photovoltaic connectors 20 onto the side of the circuit board 70 facing away from the sidewall 111, that is, by arranging the surge protection circuit 93 within the projection of the multiple photovoltaic connectors 20 onto the side of the circuit board 70 facing away from the sidewall 111, the surge protection circuit 93 is positioned close to both the first portion 23 and the second portion 24 of the multiple photovoltaic connectors 20. When the photovoltaic connectors 20 generate a momentary large voltage or large current, it can quickly respond and conduct and discharge it.

[0173] Figure 23 This is the sixth schematic diagram of the layout structure of circuit board 70 and DC switch 30, in conjunction with reference. Figure 13 and Figure 23As shown, in one implementation, the circuit board 70 is further provided with a first arc fault detection circuit 941 and a second arc fault detection circuit 942. The first arc fault detection circuit 941 is electrically connected between the first part 23 and the first switch 301, and the second arc fault detection circuit 942 is electrically connected between the second part 24 and the second switch 302. The first arc fault detection circuit 941 is located between the projection of the first part 23 on the side of the circuit board 70 facing away from the side wall 111 and the first switch 301, and the second arc fault detection circuit 942 is located between the projection of the second part 24 on the side of the circuit board 70 facing away from the side wall 111 and the second switch 302.

[0174] Similar to the layout of the first arc fault detection circuit 941 and the second arc fault detection circuit 942 when both the first switch 301 and the second switch 302 are fixed as a whole on the circuit board 70, this application places the first arc fault detection circuit 941 and the second arc fault detection circuit 942 on the circuit board 70, and makes the first arc fault detection circuit 941 and the second arc fault detection circuit 942 electrically connected between the corresponding switch and the portion of the multiple photovoltaic connectors 20. The first arc fault detection circuit 941 and the second arc fault detection circuit 942 are relatively close to the photovoltaic connectors 20, which can prevent the detection signal from attenuating, distorting or being interfered with to a certain extent, which is beneficial to improving the detection accuracy of the arc fault detection circuit.

[0175] In addition, placing the first arc fault detection circuit 941 and the second arc fault detection circuit 942 on the circuit board 70 reduces the number of wires, simplifies the circuit structure, and reduces the space occupied by the first arc fault detection circuit 941 and the second arc fault detection circuit 942 in the internal space of the accommodating cavity 11. This is beneficial for the effective use of the space of the circuit board 70 and achieves a compact structure of the power conversion device 100.

[0176] Similar to the first fixing method of DC switch 30, when the operating mechanism 32 and multiple switch bodies 33 of DC switch 30 are fixed on the side wall 111 of the accommodating cavity 11, in one implementation, partial switch bodies 33 are provided on both opposite sides of the operating mechanism 32 along a direction parallel to the side wall 111; the operating mechanism 32 includes an input shaft 323 and two sub-output shafts 3241; wherein, the input shaft 323 is fixed to the handle 31, the moving contact 332 of the switch body 33 located on one side of the operating mechanism 32 is connected to the input shaft 323 through one of the sub-output shafts 3241, and the moving contact 332 of the switch body 33 located on the other side of the operating mechanism 32 is connected to the input shaft 323 through the other sub-output shaft 3241.

[0177] Since the features of the input shaft 323 and the two sub-output shafts 3241 have been described in detail above when the operating mechanism 32 has partial switch bodies 33 on both opposite sides, they will not be repeated here to avoid repetition. For the same parts, please refer to the above description. This application, by having at least partial switch bodies 33 on both opposite sides of the operating mechanism 32 and setting two sub-output shafts 3241, can realize the opening and closing control of two sets of switch bodies 33 through one operating mechanism 32. In addition, compared with the combination of two independent DC switches 30, this integrated DC switch 30 can save one operating mechanism 32 through the shared mechanism of the operating mechanism 32, reduce the overall volume of the DC switch 30, and reduce the area occupied by the DC switch 30 on the circuit board 70.

[0178] Figure 14 This is a second schematic diagram of the circuit structure of the power conversion device 100 provided in the embodiments of this application. In one implementation, such as... Figure 14 As shown, the photovoltaic connector 20 includes multiple connectors, each of which includes a first photovoltaic connector 21 and a second photovoltaic connector 22. The first photovoltaic connector 21 is used for electrical connection to the positive line of the photovoltaic string 200, and the second photovoltaic connector 22 is used for electrical connection to the negative line of the photovoltaic string 200. The circuit board 70 has multiple first lines 71 and multiple second lines 72. Each first photovoltaic connector 21 is electrically connected to the input terminal of a first line 71, and at least some of the multiple second photovoltaic connectors 22 are connected in parallel and then electrically connected to the input terminal of a second line 72. The output terminals of each first line 71 and each second line 72 are electrically connected to a first stationary contact 333 of the DC switch 30.

[0179] That is, each photovoltaic connector 20 includes a PV+ terminal (i.e., the first photovoltaic connector 21) and a PV- terminal (i.e., the second photovoltaic connector 22). Multiple photovoltaic connectors 20 include multiple PV+ terminals and multiple PV- terminals. Each PV+ terminal is electrically connected to the input terminal of a first line 71. At least some of the multiple PV- terminals are combined into a single line and electrically connected to the input terminal of a second line 72. The output terminals of each first line 71 board 70 and each second line 72 are each electrically connected to a first stationary contact 333 of a DC switch 30.

[0180] In this configuration, at least some of the PV terminals are connected in parallel to form a single circuit and then electrically connected to the input terminal of a second line 72. This can be achieved by connecting every two PV terminals in parallel to form a single circuit and then electrically connecting it to the input terminal of a second line 72. Figure 14As shown; alternatively, three or more PV terminals can be connected in parallel and then electrically connected to the input terminal of a second line 72. That is, this application does not limit the specific number of PV terminals connected in parallel to form a single line.

[0181] For example, such as Figure 14 As shown, the photovoltaic connector 20 includes four first photovoltaic connectors 21 and four second photovoltaic connectors 22. The four first photovoltaic connectors 21 are respectively connected to the input terminal of the first line 71 of the circuit board 70, and the four second photovoltaic connectors 22 are electrically connected to the input terminal of the second line 72 of the circuit board 70 after being combined in pairs.

[0182] This application combines the second photovoltaic terminals in the photovoltaic connector 20 used for connecting negative lines with the second line 72 of the circuit board 70, thus supporting the combination of negative lines for Maximum Power Point Tracking (MPPT). Therefore, when connecting a large number of photovoltaic connectors 20, this application can achieve circuit integration of the circuit board 70 through the aforementioned negative line combination setting, reducing the size of the circuit board 70 and the number of output lines. When electrically connecting the circuit board 70 and the DC switch 30, it can reduce the number of poles in the DC switch 30, thereby reducing the size of the DC switch 30 and the number of input and output cables, and reducing the number of power distribution components in the power conversion device 100.

[0183] In addition, multiple photovoltaic strings 200 are also connected in parallel at the input end of the photovoltaic connector 20 before being electrically connected to the corresponding photovoltaic connector 20. That is, the input end of each photovoltaic connector 20 can be electrically connected to one set of photovoltaic strings 200, or it can be electrically connected to multiple sets of photovoltaic strings 200 connected in parallel.

[0184] In this application, the operating mechanism 32 and multiple switch bodies 33 of the DC switch 30 can be directly fixed to the side wall 111 of the accommodating cavity 11, or directly fixed to the side of the circuit board 70 opposite to the side wall 111. Fixing the operating mechanism 32 and multiple switch bodies 33 of the DC switch 30 to the side of the circuit board 70 opposite to the side wall 111 can save wiring components between the DC switch 30 and the circuit board 70, or shorten the path of the electrical connection lines between the DC switch 30 and the circuit board 70.

[0185] To reduce the number of wiring components between the photovoltaic connector 20 and the circuit board 70, in one implementation, the portion of the photovoltaic connector 20 extending into the receiving cavity 11 is fixed to the side of the circuit board 70 facing the side wall 111 and contacts the wiring on the circuit board 70. Thus, when the photovoltaic connector 20 is fixed to the circuit board 70, it can directly contact the wiring on the circuit board 70, eliminating the need for wiring components (such as cables or copper busbars) between the circuit board 70 and the photovoltaic connector 20. This reduces the number of components in the power conversion device 100, simplifies wiring, makes the internal wiring of the power conversion device 100 neater, and facilitates the layout of components within the receiving cavity 11.

[0186] For example, the various parts of the DC switch 30 can be fixed together (e.g., the operating mechanism 32 of the DC switch 30 and the switch body 33 are fixedly and indivisibly connected), or they can be set up in a modular and detachable manner (e.g., the operating mechanism 32 of the DC switch 30 and the switch body 33 are detachably connected). The following will illustrate these two cases by way of example.

[0187] (1) The operating mechanism 32 of the DC switch 30 is detachably connected to the switch body 33.

[0188] Figure 15 This is the third schematic diagram of the structure of the DC switch 30 provided in the embodiments of this application, as shown below. Figure 15 As shown, in one implementation, each switch body 33 includes a first housing 331 and a moving contact 332. Figure 15 (Not shown in the image) is located inside the first housing 331. The first stationary contact 333 and the second stationary contact 334 are both partially located inside the first housing 331 and partially exposed from inside the first housing 331.

[0189] The operating mechanism 32 includes a second housing 321, an input shaft 323, and an output shaft 324. Figure 15 (Not shown in the diagram), wherein one end of the input shaft 323 is located outside the device housing 10 and connected to the handle 31, and the other end of the input shaft 323 passes through the device housing 10 and extends into the second housing 321; one end of the output shaft 324 is located inside the second housing 321 and is connected to the input shaft 323 in a driving connection, and the other end of the output shaft 324 passes through the first housing 331 and is connected to the moving contact 332 of each switch body 33; the operating mechanism 32 drives the moving contact 332 of each switch body 33 to rotate through the output shaft 324.

[0190] The second housing 321 and the first housing 331 of the switch body 33 closest to the operating mechanism 32 among the plurality of switch bodies 33 are detachably connected, and the output shaft 324 and the moving contact 332 of the switch body 33 closest to the operating mechanism 32 among the plurality of switch bodies 33 are detachably connected. Figure 15The arrows indicate the directions for assembling and disassembling the operating mechanism 32 and the switch body 33. That is, the operating mechanism 32 and the switch body 33 can be assembled and disassembled along the arrow directions. For example, the operating mechanism 32 can be assembled and disassembled along the arrow directions. Figure 15 The downward movement shown can be assembled with the switch body 33; the operating mechanism 32 moves along... Figure 15 The upward movement shown can be separated from the switch body 33.

[0191] The specific structural form of the detachable operating mechanism 32 and switch body 33 is not limited in this application. For example, the first housing 331 and the second housing 321 can be connected by a groove and a protrusion. Similarly, the detachable connection between the moving contact 332 and the output shaft 324 can also be achieved by a groove and a protrusion.

[0192] For example, the switch body 33 and the circuit board 70 or the side wall 111 are fixed by welding or screws, and the operating mechanism 32 is fixed to the circuit board 70 or the side wall 111 by screws.

[0193] This application detachably connects the first housing 331 of the operating mechanism 32 to the first housing 331 of the switch body 33 closest to the operating mechanism 32 among a plurality of switch bodies 33. This allows the operating mechanism 32 to be separated from the multiple switch bodies 33. Thus, if the height of the operating mechanism 32 exceeds the height limit of the space used for assembling the circuit board 70 and the DC switch 30, this application modularizes the operating mechanism 32 and the switch bodies 33 (i.e., the operating mechanism 32 and the switch bodies 33 can be separated to form two independent modules). In scenarios with limited assembly space, the multiple switch bodies 33 can be fixed to the terminal block first, and then the operating mechanism 32 can be installed on the circuit board 70 after leaving the space-constrained environment. This connection allows the operating mechanism 32 to be connected to the switch body 33 closest to the operating mechanism 32 among the multiple stacked switch bodies 33. This arrangement enables the assembly of the DC switch 30 in height-constrained environments, reducing process complexity and production costs.

[0194] Since the moving contact 332 of the output shaft 324 and the switch body 33 closest to the operating mechanism 32 among the multiple switch bodies 33 are detachably connected, after the operating mechanism 32 is separated from the switch body 33 closest to the operating mechanism 32 among the multiple switch bodies 33, the operating mechanism 32 and the switch body 33 will be separated as two independent modules; and after the operating mechanism 32 is connected to the switch body 33 closest to the operating mechanism 32 among the multiple switch bodies 33, the moving contact 332 of the output shaft 324 and the switch body 33 closest to the operating mechanism 32 among the multiple switch bodies 33 are connected together, and the moving contact 332 in the multiple switch bodies 33 can be driven to rotate through the operating mechanism 32 to realize the opening or closing of the DC switch 30. Therefore, the detachable connection between the operating mechanism 32 and the switch body 33 closest to the operating mechanism 32 will not affect the normal opening and closing of the DC switch 30 (after the operating mechanism 32 and the switch body 33 closest to the operating mechanism 32 among the multiple switch bodies 33 are connected together, the handle 31 drives the operating mechanism 32 to move, and the operating mechanism 32 can drive the moving contact 332 of the switch body 33 to rotate to achieve opening and closing).

[0195] (2) The operating mechanism 32 of the DC switch 30 is fixedly and inseparably connected to the switch body 33.

[0196] Figure 16 This is the fourth schematic diagram of the structure of the DC switch 30 provided in the embodiments of this application. Figure 17 for Figure 16 A top view of the DC switch 30 in the middle, in conjunction with reference. Figure 16 and Figure 17 As shown, in one implementation, each switch body 33 includes a first housing 331, a moving contact 332 located inside the first housing 331, and a first stationary contact 333 and a second stationary contact 334, each having a portion located inside the first housing 331 and another portion exposed from inside the first housing 331.

[0197] The operating mechanism 32 includes a second housing 321, an input shaft 323, and an output shaft 324. One end of the input shaft 323 is located outside the device housing 10 and connected to the handle 31. The other end of the input shaft 323 passes through the device housing 10 and extends into the second housing 321. One end of the output shaft 324 is located inside the first housing 331 and is connected to the input shaft 323. The other end of the output shaft 324 passes through the first housing 331 and is connected to the moving contact 332 of each switch body 33. The operating mechanism 32 drives the moving contact 332 of each switch body 33 to rotate through the output shaft 324.

[0198] The first housing 331 and the second housing 321 are fixedly connected, and the output shaft 324 and the moving contact 332 of the switch body 33 closest to the operating mechanism 32 among the multiple switch bodies 33 are fixedly connected.

[0199] In this application, the first housing 331 of the switch body 33 and the second housing 321 of the operating mechanism 32 are fixedly connected. When the operating mechanism 32 and the switch body 33 are fixed on the circuit board 70 or on the side wall 111 of the accommodating cavity 11, the operating mechanism 32 and the switch body 33 of the DC switch 30 can be installed as a whole, which improves the assembly efficiency and assembly accuracy of the power conversion device 100.

[0200] Furthermore, regardless of whether the operating mechanism 32 of the DC switch 30 and the switch body 33 are fixedly and indivisibly connected or detachably connected, the first housing 331 of two adjacent switch bodies 33 can be fixedly connected. In this way, multiple switch bodies 33 can be fixed together to the circuit board 70 or the side wall 111 in a single assembly process, which can reduce the assembly difficulty.

[0201] Also, such as Figure 17 As shown, the input shaft 323 and the output shaft 324 can be connected by a transmission structure 322. For example, this transmission structure 322 can be a linkage mechanism. For example, as... Figure 17 As shown, the DC switch 30 of this application also includes a trip lever 341. When tripping, the trip unit 34 drives the trip lever 341 to move, so that the trip lever 341 acts on the transmission structure 322, and the transmission structure 322 drives the output shaft 324 to rotate, thereby driving the moving contact 332 of the switch body 33 to open.

[0202] This application does not restrict the arrangement direction of the handle 31, operating mechanism 32, and multiple switch bodies 33, which can be determined according to the actual application scenario. For example, the handle 31, operating mechanism 32, and multiple switch bodies 33 can be arranged sequentially in the same direction, or coaxially or approximately coaxially; or, for example, the arrangement direction of the handle 31 and operating mechanism 32 can be perpendicular to the arrangement direction of the multiple switch bodies 33. The following will illustrate the arrangement of the handle 31, operating mechanism 32, and multiple switch bodies 33 by way of example.

[0203] (1) The first arrangement of the handle 31, the operating mechanism 32, and multiple switch bodies 33: combined with Figure 4 and Figure 16 As shown, the arrangement direction of the handle 31 and the operating mechanism 32 is perpendicular to the side wall 111, and the arrangement direction of the multiple switch bodies 33 is parallel to the side wall 111.

[0204] This reduces the size of the DC switch 30 along the arrangement direction of the multiple switch bodies 33, enabling the DC switch 30 to be used in scenarios where space is limited along the arrangement direction of the multiple switch bodies 33, or in scenarios where it is inconvenient to assemble the handle 31 or the operating handle 31 along the arrangement direction of the multiple switch bodies 33. This arrangement of the DC switch 30 in this application can support the application of the DC switch 30 in special scenarios.

[0205] When the arrangement direction of the handle 31 and the operating mechanism 32 is perpendicular to the side wall 111, and the arrangement direction of the multiple switch bodies 33 is parallel to the side wall 111, for example, as shown... Figure 16 and Figure 17 As shown, the input shaft 323 of the operating mechanism 32 is set at 90° to the output shaft 324 of the operating mechanism 32.

[0206] For example, the 90° transmission between the input shaft 323 and the output shaft 324 can be achieved by bevel gear meshing.

[0207] (2) The second arrangement of handle 31, operating mechanism 32 and multiple switch bodies 33: the arrangement direction of handle 31 and operating mechanism 32 is parallel to the side wall 111, and the arrangement direction of handle 31 and operating mechanism 32 is parallel to the arrangement direction of multiple switch bodies 33.

[0208] This application arranges the handle 31, operating mechanism 32, and multiple switch bodies 33 in the manner described above, with the input shaft 323 and output shaft 324 arranged in parallel. This simplifies the transmission method and reduces the size of the DC switch 30 along the arrangement direction of the circuit board 70 and side wall 111. This allows the power conversion device 100 to be applied in scenarios where the size along the arrangement direction of the circuit board 70 and side wall 111 is limited, or to be applicable in scenarios where it is inconvenient to assemble the handle 31 or the operating handle 31 along the arrangement direction of the circuit board 70 and side wall 111.

[0209] Furthermore, the DC switch 30 and circuit board 70 provided in this application can also be assembled in the cabinet of a power distribution cabinet. That is, the power distribution cabinet can also use the DC switch 30 and circuit board 70 provided in this application. The specific structure and assembly relationship of the DC switch 30 and circuit board 70 are as described above and will not be repeated here. The assembly relationship between the DC switch 30 and the cabinet can be referred to the assembly relationship between the DC switch 30 and the device housing 10 described above, and the assembly relationship between the circuit board 70 and the cabinet can be referred to the assembly relationship between the circuit board 70 and the device housing 10 described above.

[0210] 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, a photovoltaic connector, a circuit board, a DC switch, and a power conversion circuit, wherein the housing has a receiving cavity; One end of the photovoltaic connector is fixed to the outside of the device housing, and the other end of the photovoltaic connector passes through the device housing and extends into the receiving cavity. The photovoltaic connector is electrically connected to the circuit board. The circuit board is located inside the accommodating cavity, and the surface of the circuit board is fixed to the side wall of the accommodating cavity. The circuit board is also equipped with a lightning protection circuit. The DC switch includes a handle, an operating mechanism, and multiple switch bodies stacked together; wherein the handle is connected to the outside of the device housing, the operating mechanism and the multiple switch bodies are all fixed inside the accommodating cavity, and the arrangement direction of the multiple switch bodies is parallel to the side wall. Each of the switch bodies includes a moving contact, a first stationary contact, and a second stationary contact. The moving contact is drivenly connected to the operating mechanism, and the first and second stationary contacts are fixed relative to the device housing. The first stationary contact of each switch body is electrically connected to the circuit board and, through the circuit board, to the photovoltaic connector. The second stationary contact of each switch body is electrically connected to the power conversion circuit. The input terminal of the surge protection circuit is electrically connected between the photovoltaic connector and the first stationary contact, and the output terminal of the surge protection circuit is grounded. The handle is used to drive the moving contact to rotate through the operating mechanism, so that the moving contact of each switch body is connected or disconnected from the first stationary contact and the second stationary contact.

2. The power conversion device according to claim 1, characterized in that, The operating mechanism and the plurality of switch bodies are all fixed to the side of the circuit board away from the side wall. The first stationary contact of each switch body is electrically connected to the circuit board, and the second stationary contact of each switch body is electrically connected to the power conversion circuit through a second electrical connector.

3. The power conversion device according to claim 2, characterized in that, Each of the switch bodies includes a first housing, the moving contact is located inside the first housing, and both the first stationary contact and the second stationary contact are partially located inside the first housing and partially exposed from the first housing; The portion of the first stationary contact and the portion of the second stationary contact exposed in the first housing of each switch body are located on different sides of the first housing; and the portion of the first stationary contact exposed in the first housing of each switch body is located on the side of the first housing facing the circuit board and is soldered to the circuit board.

4. The power conversion device according to claim 2 or 3, characterized in that, The DC switch includes a first switch and a second switch spaced apart. The photovoltaic connectors include a plurality of connectors. A portion of the plurality of photovoltaic connectors is electrically connected to the first switch via the circuit board, and another portion of the plurality of photovoltaic connectors is electrically connected to the second switch via the circuit board.

5. The power conversion device according to claim 4, characterized in that, The arrangement direction of the plurality of switch bodies of the first switch and the arrangement direction of the plurality of switch bodies of the second switch are both perpendicular to the bottom surface of the accommodating cavity; the lightning protection circuit is located between the first switch and the second switch; The plurality of photovoltaic connectors include a first part and a second part, wherein the projection of the first part on the side of the circuit board facing away from the sidewall is located between the first switch and the surge protection circuit, and the projection of the second part on the side of the circuit board facing away from the sidewall is located between the second switch and the surge protection circuit.

6. The power conversion device according to claim 5, characterized in that, The circuit board is also provided with a first arc fault detection circuit and a second arc fault detection circuit. The first arc fault detection circuit is electrically connected between the first part and the first switch, and the second arc fault detection circuit is electrically connected between the second part and the second switch. The first arc fault detection circuit is located between the projection of the first part on the side of the circuit board facing away from the sidewall and the first switch, and the second arc fault detection circuit is located between the projection of the second part on the side of the circuit board facing away from the sidewall and the second switch.

7. The power conversion device according to any one of claims 4-6, characterized in that, The operating mechanism and the plurality of switch bodies of the first switch, as well as the operating mechanism and the plurality of switch bodies of the second switch, are all fixed to the side of the circuit board away from the side wall.

8. The power conversion device according to any one of claims 4-6, characterized in that, The circuit board includes a first sub-board and a second sub-board spaced apart, the surfaces of the first sub-board and the second sub-board being fixed to the side wall; a portion of the plurality of photovoltaic connectors is electrically connected to the first sub-board, and another portion of the plurality of photovoltaic connectors is electrically connected to the second sub-board; The operating mechanism of the first switch and the plurality of switch bodies are all fixed to the side of the first sub-board away from the side wall, and a portion of the plurality of photovoltaic connectors are electrically connected to the first switch through the first sub-board; the operating mechanism of the second switch and the plurality of switch bodies are all fixed to the side of the second sub-board away from the side wall, and another portion of the plurality of photovoltaic connectors are electrically connected to the second switch through the second sub-board.

9. The power conversion device according to claim 8, characterized in that, The lightning protection circuit includes a first lightning protection circuit and a second lightning protection circuit, wherein... The first lightning protection circuit is disposed on the first sub-board, and the input terminal of the first lightning protection circuit is electrically connected between the first switch and the photovoltaic connector electrically connected to the first sub-board, and the output terminal of the first lightning protection circuit is grounded; The second surge protection circuit is located on the second sub-board, and the input terminal of the second surge protection circuit is electrically connected between the second switch and the photovoltaic connector electrically connected to the second sub-board, and the output terminal of the second surge protection circuit is grounded.

10. The power conversion device according to claim 9, characterized in that, The lightning protection circuit also includes conductive components; The output terminal of the second lightning protection circuit is electrically connected to the output terminal of the first lightning protection circuit through the conductive component; Alternatively, the output terminal of the first surge protection circuit is electrically connected to the output terminal of the second surge protection circuit through the conductive element.

11. The power conversion device according to any one of claims 1-3, characterized in that, Along a direction parallel to the sidewall, portions of the switch body are provided on both opposite sides of the operating mechanism; The operating mechanism includes an input shaft and two sub-output shafts; wherein, the input shaft is fixed to the handle, the moving contact of the switch body located on one side of the operating mechanism is connected to the input shaft via one of the sub-output shafts, and the moving contact of the switch body located on the other side of the operating mechanism is connected to the input shaft via the other sub-output shaft.

12. The power conversion device according to claim 11, characterized in that, The arrangement direction of the multiple switch bodies of the DC switch is parallel to the bottom surface of the accommodating cavity, the arrangement direction of the photovoltaic connector and the DC switch is perpendicular to the bottom surface of the accommodating cavity, and the lightning protection circuit is located on the side of the photovoltaic connector away from the DC switch.

13. The power conversion device according to claim 12, characterized in that, The circuit board is also provided with an arc fault detection circuit, which is electrically connected between the photovoltaic connector and the DC switch; The arc fault detection circuit includes a first arc fault detection circuit and a second arc fault detection circuit, which are located on opposite sides of the DC switch along the arrangement direction of the plurality of switch bodies of the DC switch.

14. The power conversion device according to claim 1, characterized in that, The operating mechanism and the plurality of switch bodies are all fixed to the side wall. The first stationary contact of each switch body is electrically connected to the circuit board through a first electrical connector, and the second stationary contact of each switch body is electrically connected to the power conversion circuit through a second electrical connector.

15. The power conversion device according to claim 14, characterized in that, The DC switch includes a first switch and a second switch spaced apart. The photovoltaic connectors include a plurality of connectors. A portion of the plurality of photovoltaic connectors is electrically connected to the first switch through the circuit board and the first electrical connector. Another portion of the plurality of photovoltaic connectors is electrically connected to the second switch through the circuit board and the first electrical connector.

16. The power conversion device according to claim 15, characterized in that, The arrangement direction of the plurality of switch bodies of the first switch and the arrangement direction of the plurality of switch bodies of the second switch are both perpendicular to the bottom surface of the accommodating cavity; the lightning protection circuit is located between the first switch and the second switch; The photovoltaic connector includes a first part and a second part, wherein the projection of the first part on the side of the circuit board facing away from the sidewall is located between the first switch and the surge protection circuit, and the projection of the second part on the side of the circuit board facing away from the sidewall is located between the second switch and the surge protection circuit.

17. The power conversion device according to claim 16, characterized in that, The circuit board is also provided with a first arc fault detection circuit and a second arc fault detection circuit. The first arc fault detection circuit is electrically connected between the first part and the first switch, and the second arc fault detection circuit is electrically connected between the second part and the second switch. The first arc fault detection circuit is located between the projection of the first part on the side of the circuit board facing away from the sidewall and the first switch, and the second arc fault detection circuit is located between the projection of the second part on the side of the circuit board facing away from the sidewall and the second switch.

18. The power conversion device according to any one of claims 1-17, characterized in that, The photovoltaic connector includes multiple photovoltaic connectors, each of which includes a first photovoltaic connector and a second photovoltaic connector. The first photovoltaic connector is used for a linear connection with the positive terminal of the photovoltaic string, and the second photovoltaic connector is used for a linear connection with the negative terminal of the photovoltaic string. The circuit board has a plurality of first lines and a plurality of second lines, wherein each first photovoltaic connector is electrically connected to an input terminal of a first line, at least some of the plurality of second photovoltaic connectors are connected in parallel and electrically connected to an input terminal of a second line, and the output terminal of each first line and the output terminal of each second line are electrically connected to a first stationary contact of the DC switch.

19. The power conversion device according to any one of claims 1-18, characterized in that, The portion of the photovoltaic connector that extends into the accommodating cavity is fixed to the side of the circuit board facing the sidewall and is in contact with the circuitry on the circuit board.

20. The power conversion device according to any one of claims 1-19, characterized in that, Each of the switch bodies includes a first housing, the moving contact is located inside the first housing, and both the first stationary contact and the second stationary contact are partially located inside the first housing and partially exposed from the first housing; The operating mechanism includes a second housing, an input shaft, and an output shaft. One end of the input shaft is located outside the device housing and connected to the handle, while the other end of the input shaft passes through the device housing and extends into the second housing. One end of the output shaft is located inside the second housing and is connected to the input shaft. The other end of the output shaft passes through the first housing and is connected to the moving contact of each switch body. The operating mechanism drives the moving contact of each switch body to rotate via the output shaft. The first housing and the second housing are fixedly connected, and the output shaft and the moving contact of the switch body closest to the operating mechanism among the plurality of switch bodies are fixedly connected.

21. The power conversion device according to any one of claims 1-19, characterized in that, Each of the switch bodies includes a first housing, the moving contact is located inside the first housing, and both the first stationary contact and the second stationary contact are partially located inside the first housing and partially exposed from the first housing; The operating mechanism includes a second housing, an input shaft, and an output shaft. One end of the input shaft is located outside the device housing and connected to the handle, while the other end of the input shaft passes through the device housing and extends into the second housing. One end of the output shaft is located inside the first housing and is connected to the input shaft. The other end of the output shaft passes through the first housing and is connected to the moving contact of each switch body. The operating mechanism drives the moving contact of each switch body to rotate via the output shaft. The second housing and the first housing of the switch body closest to the operating mechanism among the plurality of switch bodies are detachably connected, and the output shaft and the moving contact of the switch body closest to the operating mechanism among the plurality of switch bodies are detachably connected.

22. The power conversion device according to any one of claims 1-21, characterized in that, The arrangement of the handle and the operating mechanism is perpendicular to the side wall.

23. The power conversion device according to any one of claims 1-21, characterized in that, The handle and the operating mechanism are arranged in a direction parallel to the side wall, and the arrangement direction of the handle and the operating mechanism is parallel to the arrangement direction of the plurality of switch bodies.

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