Photovoltaic inverter

Abstract

The application provides a photovoltaic inverter, and relates to the technical field of photovoltaic power generation. The photovoltaic inverter comprises a plurality of power devices, a first box body, a second box body, a first circuit board located in the first box body, and a second circuit board located in the second box body; a part of the plurality of power devices is fixed to the first circuit board, and another part is fixed to the second circuit board. The photovoltaic inverter further comprises a first connecting terminal and a second connecting terminal; one end of the first connecting terminal is used for electrical connection with a photovoltaic module, the other end is electrically connected with the first circuit board, the first circuit board is electrically connected with the second circuit board, the second circuit board is electrically connected with one end of the second connecting terminal, and the other end of the second connecting terminal is used for electrical connection with a power grid or a load. The first connecting terminal is fixed to the first box body and at least partially located outside the first box body, and the second connecting terminal is fixed to the second box body and at least partially located outside the second box body. The photovoltaic inverter can reduce the device volume under the condition of high power level.

Description

Technical Field

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

[0002] A photovoltaic (PV) inverter is the core power conversion device in a photovoltaic (PV) power generation system. Through its internal power electronic topology, it converts the direct current (DC) output from PV modules into alternating current (AC) that matches the power grid, and performs grid-connected regulation and system protection functions. To connect the PV modules and the inverter, the inverter needs to be equipped with multiple sets of DC input terminals on its DC side. These terminals serve as the electrical connection carriers between the PV modules and the internal power electronic topology of the inverter. The layout of these terminals directly affects the overall size of the PV inverter.

[0003] As photovoltaic (PV) power plants develop towards higher power outputs, the power ratings of PV inverters continue to increase. To accommodate the grid connection requirements of larger-scale PV arrays, the number of DC input terminals on PV inverters has increased significantly. However, existing PV inverters mostly have their DC input terminals located at the bottom of the chassis. This dense arrangement of DC input terminals leads to a substantial increase in the area of ​​the chassis bottom, forcing a passive increase in chassis size. This not only increases material costs but also results in problems such as increased overall weight. Utility Model Content

[0004] This application provides a photovoltaic inverter. This photovoltaic inverter can reduce the size of the device and improve cost advantages while maintaining high power levels.

[0005] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0006] This application provides a photovoltaic inverter, including multiple power devices, a first enclosure, a second enclosure, a first circuit board located in the first enclosure, and a second circuit board located in the second enclosure; a portion of the multiple power devices is fixed to the first circuit board, and another portion of the multiple power devices is fixed to the second circuit board.

[0007] The photovoltaic inverter also includes a first connection terminal and a second connection terminal; one end of the first connection terminal is used for electrical connection with the photovoltaic module, the other end of the first connection terminal is electrically connected to a first circuit board, the first circuit board is electrically connected to a second circuit board, the second circuit board is electrically connected to one end of the second connection terminal, and the other end of the second connection terminal is used for electrical connection with the power grid or a load. The first connection terminal is fixed to a first housing and at least partially located outside the first housing, and the second connection terminal is fixed to a second housing and at least partially located outside the second housing.

[0008] In the photovoltaic inverter disclosed in this application, a first enclosure and a second enclosure are provided, with a first circuit board and a portion of a plurality of power devices located in the first enclosure, and another portion of the second circuit board and a plurality of power devices located in the second enclosure. A first connection terminal for electrical connection with the photovoltaic modules is fixed to the first enclosure and at least partially located outside the first enclosure, and a second connection terminal for electrical connection with the grid or load is fixed to the second enclosure and at least partially located outside the second enclosure. Thus, when the photovoltaic inverter adopts a high power level and requires an increase in the number of first connection terminals, since the numerous first connection terminals electrically connected to the photovoltaic modules are all located in the first enclosure, increasing the number of first connection terminals only increases the volume of the first enclosure. For the second enclosure, increasing the number of first connection terminals does not affect the volume of the second enclosure, which can maintain its original volume. Compared to photovoltaic inverters that use a single enclosure to house the first circuit board, the second circuit board, and multiple power devices, this application divides the enclosure into two parts (the first enclosure and the second enclosure). This allows the volume of the enclosure without the first connection terminal (i.e., the second enclosure) to be independent of the power rating increase, so that the volume of the second enclosure is not affected by the power rating of the photovoltaic inverter. Therefore, in the case of high power ratings, this application can reduce the device size and improve the device cost advantage.

[0009] In some embodiments, the photovoltaic inverter further includes a third connection terminal and a fourth connection terminal. One end of the third connection terminal is electrically connected to a first circuit board, the other end of the third connection terminal is electrically connected to one end of the fourth connection terminal, and the other end of the fourth connection terminal is electrically connected to a second circuit board. The third connection terminal is fixed to the first housing and is at least partially located outside the first housing, and the fourth connection terminal is fixed to the second housing and is at least partially located outside the second housing.

[0010] This application, by providing a third and a fourth connection terminal, enables the electrical connection between the first and second circuit boards. The third connection terminal connects to the first circuit board, allowing its electrical signals to be routed outside the first enclosure. Simultaneously, the fourth connection terminal connects to the second circuit board, allowing its electrical signals to be routed outside the second enclosure. Thus, during wiring, the connection between the first and second circuit boards can be achieved simply by connecting the third and fourth connection terminals outside the first and second enclosures. In other words, this structural design allows for the electrical connection of the first and second circuit boards, located in different enclosures, without opening either enclosure. This simplifies wiring operations and preserves the airtightness of the first and second enclosures, improving the sealing performance of the photovoltaic inverter.

[0011] In some embodiments, the portion of the first connecting terminal outside the first housing is located on the side of the first housing away from the second housing, and the portion of the third connecting terminal outside the first housing is located on the side of the first housing facing the second housing. The portion of the fourth connecting terminal outside the second housing is located on the side of the second housing facing the first housing, and the portion of the second connecting terminal outside the second housing is located on the side of the second housing away from the first housing.

[0012] This application adopts the above-described layout, where the first, third, fourth, and second connecting terminals only occupy the dimensions of the photovoltaic inverter in the direction of arrangement of the first and second enclosures, thus saving the dimensions perpendicular to the direction of arrangement of the first and second enclosures. In this way, the photovoltaic inverter can be used in spaces with limited space perpendicular to the direction of arrangement of the first and second enclosures, meeting the application requirements of photovoltaic inverters in special application scenarios.

[0013] In some embodiments, the portion of the third connecting terminal outside the first housing is located on the side of the first housing facing the second housing, the portion of the fourth connecting terminal outside the second housing is located on the side of the second housing facing the first housing, and the portion of the second connecting terminal outside the second housing is located on the side of the second housing away from the first housing. The arrangement direction of the first connecting terminal and the first housing is perpendicular to the arrangement direction of the third connecting terminal and the first housing.

[0014] The first, second, third, and fourth connecting terminals of this application adopt this layout. The layout of the third, fourth, and second connecting terminals occupies the dimensions of the photovoltaic inverter in the direction of arrangement of the first and second housings, which can save a certain amount of space perpendicular to the arrangement direction of the first and second housings. The arrangement direction of the first connecting terminal and the first housing is perpendicular to the arrangement direction of the third connecting terminal and the first housing. That is, the first connecting terminal is located on the side of the first housing adjacent to the third connecting terminal. Thus, this layout is more suitable when the first housing of the photovoltaic inverter is installed at a corner; or, when there is a certain space capacity in the direction perpendicular to the first and second housings, this layout can effectively utilize space.

[0015] In some embodiments, the photovoltaic inverter further includes a plurality of first fins and a plurality of second fins. The plurality of first fins protrude from a first wall of a first housing in a direction away from the first housing, and the plurality of second fins protrude from a second wall of a second housing in a direction away from the second housing. The first wall and the second wall are both located on the same side of the first housing. The arrangement direction of the plurality of first fins is parallel to the arrangement direction of the first housing and the second housing, and the arrangement direction of the plurality of second fins is parallel to the arrangement direction of the first housing and the second housing.

[0016] This application improves the heat dissipation effect of multiple power devices in a photovoltaic inverter by using multiple first fins and multiple second fins. The first fins increase the heat dissipation area of ​​the power devices on the first circuit board, and the second fins increase the heat dissipation area of ​​the power devices on the second circuit board. Furthermore, the arrangement direction of the multiple first fins is parallel to the arrangement direction of the first and second housings; that is, the gap between two adjacent first fins (i.e., the heat dissipation channel) is perpendicular to the arrangement direction of the first and second housings. When the first and second housings are arranged horizontally, the heat dissipation channel is vertically positioned. Hot air generated by the power devices rises from the bottom because its density is lower than that of cold air. The vertical arrangement of the heat dissipation channel in this application utilizes the upward tendency of hot air, allowing heat to be transferred upwards. Therefore, heat in the first housing will not be transferred to the second housing, and vice versa. Furthermore, since both the first and second fins are located outside the housing, the heat transferred upwards during heat dissipation through the fins will be conducted to the external environment and will not affect the power devices. Therefore, the layout method of this application can improve the problem of heat dissipation path coupling and can improve the heat dissipation effect by utilizing the characteristic that hot air tends to rise.

[0017] In some embodiments, the photovoltaic inverter further includes a first fan and a second fan. The first fan is fixed to a first housing, and the arrangement direction of the first fan and a plurality of first fins is perpendicular to the arrangement direction of the first housing and the second housing. The second fan is fixed to a second housing, and the arrangement direction of the second fan and a plurality of second fins is perpendicular to the arrangement direction of the first housing and the second housing.

[0018] This application improves the heat dissipation efficiency by setting a first fan and a second fan, which can force turbulence and enhance the heat dissipation effect of the photovoltaic inverter.

[0019] In some embodiments, the portion of the first connecting terminal outside the first housing is located on the side of the first housing opposite to the second housing, and the arrangement direction of the third connecting terminal and the first housing is perpendicular to the arrangement direction of the first connecting terminal and the first housing. The arrangement direction of the fourth connecting terminal and the second connecting terminal is perpendicular to the arrangement direction of the first housing and the second housing; the arrangement direction of the third connecting terminal and the fourth connecting terminal is parallel to the arrangement direction of the first housing and the second housing.

[0020] This application employs a layout that, compared to the arrangement of the first, second, third, and fourth connecting terminals side-by-side along the direction of the first and second housings, occupies less space in the direction of the first and second housings, and effectively utilizes the space of the photovoltaic inverter perpendicular to the direction of the first and second housings. This layout results in a more regular overall structure for the photovoltaic inverter, suitable for conventional applications. Furthermore, in scenarios with a large vertical space, the photovoltaic inverter of this application can also be arranged vertically with the first and second housings positioned below each other. This places the first connecting terminal at the bottom of the photovoltaic inverter, facilitating wiring between the first connecting terminal and the photovoltaic modules.

[0021] In some embodiments, the photovoltaic inverter further includes a plurality of first fins and a plurality of second fins. The plurality of first fins protrude from a first wall of a first housing in a direction away from the first housing, and the plurality of second fins protrude from a second wall of a second housing in a direction away from the second housing. The first wall and the second wall are both located on the same side of the first housing. The arrangement direction of the plurality of first fins is parallel to the arrangement direction of the first housing and the second housing, and the arrangement direction of the plurality of second fins is perpendicular to the arrangement direction of the first housing and the second housing.

[0022] In this manner, the gap between two adjacent first fins (i.e., the heat dissipation channel) is perpendicular to the arrangement direction of the first and second housings, and the gap between two adjacent second fins (i.e., the heat dissipation channel) is parallel to the arrangement direction of the first and second housings. Thus, when the first and second housings are arranged vertically, with the first housing below the second housing, the heat dissipation channels of the multiple first fins are horizontally positioned, and the heat dissipation channels of the multiple second fins are vertically positioned. The hot air generated by the power devices inside the second housing can be discharged horizontally, without affecting the heat dissipation of the power devices located above the first housing. The hot air generated by the power devices inside the second housing can be discharged vertically, and because hot air is less dense than cold air, the heat from the power devices inside the second housing will be transferred from bottom to top. In this case, the vertical arrangement of the heat dissipation channels corresponding to the second housing in this application utilizes the characteristic that hot air tends to rise, allowing heat to be transferred upwards, resulting in better heat dissipation.

[0023] In some embodiments, there is a gap between every two adjacent second fins; along the arrangement direction of the first housing and the second housing, the gap between at least two second fins is staggered with the plurality of first fins.

[0024] This application improves the heat dissipation effect of the second fins by staggering the gap between at least two second fins with respect to a plurality of first fins, so that at least one heat dissipation channel among the plurality of second fins is not affected by the plurality of first fins.

[0025] In some embodiments, the photovoltaic inverter further includes a first fan and a second fan. The first fan is fixed to a first housing, and the arrangement direction of the first fan and the plurality of first fins is perpendicular to the arrangement direction of the first housing and the second housing. The second fan is fixed to a second housing, and the second fan is located between the plurality of second fins and the plurality of first fins.

[0026] This application incorporates a first fan and a second fan, which force airflow and improve heat dissipation efficiency, thereby enhancing the heat dissipation effect of the photovoltaic inverter. Specifically, the arrangement direction of the first fan and multiple first fins is perpendicular to the arrangement direction of the first and second housings. The first fan blows air onto the multiple first fins in this perpendicular direction, enhancing the heat dissipation effect of the first fins; similarly, the second fan blows air onto the multiple second fins in the same direction, enhancing the heat dissipation effect of the second fins.

[0027] In some embodiments, power devices located on a first circuit board form at least a portion of a first power conversion circuit, and power devices located on a second circuit board form at least a portion of a second power conversion circuit. The first power conversion circuit is used to boost or buck DC power, and the second power conversion circuit is used to convert DC power into AC power.

[0028] This application, by setting up a first enclosure and a second enclosure, and such that the power devices on the first circuit board in the first enclosure form at least a partial first power conversion circuit, and the power devices on the second circuit board in the second enclosure form at least a partial second power conversion circuit, allows the power devices in the first enclosure to boost or buck DC power, and the power devices in the second enclosure to convert DC power to AC power. This separate arrangement of the first and second power conversion circuits, with their different functions, avoids concentrated heat buildup in both circuits, reducing the risk of localized temperature rise and extending the lifespan of the photovoltaic inverter. Furthermore, the separate placement of the first and second power conversion circuits in different enclosures achieves physical isolation, reducing the risk of signal interference. Additionally, the separate arrangement of the first and second power conversion circuits facilitates independent replacement of different modules, simplifying the later maintenance of the photovoltaic inverter.

[0029] In some embodiments, the photovoltaic inverter further includes a connecting cable, one end of which is connected to a third connecting terminal and the other end of which is connected to a fourth connecting terminal; or, the photovoltaic inverter further includes a conductive connecting bus, one end of which is connected to the third connecting terminal and the other end of which is connected to the fourth connecting terminal.

[0030] The third and fourth connecting terminals of this application are electrically connected using connecting cables or conductive connectors. The wiring methods of connecting cables and conductive connectors are relatively simple. When connecting the third and fourth connecting terminals using connecting cables or conductive connectors, the requirements for the arrangement of the third and fourth connecting terminals and the arrangement of the first and second housings are relatively low, and the installation error tolerance is high. The arrangement of the first and second housings can be changed according to the space requirements of the actual application scenario.

[0031] In some embodiments, one of the third and fourth connecting terminals has a connecting block, and the other of the third and fourth connecting terminals has a groove, into which the connecting block is inserted.

[0032] The third and fourth connection terminals of this application adopt a plug-in connection method, which can avoid the introduction of other electrical connections and reduce the number of components in the photovoltaic inverter. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of a photovoltaic power station provided in an embodiment of this application;

[0034] Figure 2 This is one of the structural schematic diagrams of a photovoltaic inverter provided in the embodiments of this application;

[0035] Figure 3 for Figure 2 A left view of one part of the photovoltaic inverter in the image;

[0036] Figure 4 for Figure 2 A top view of one part of the photovoltaic inverter in the image;

[0037] Figure 5 for Figure 2 A top view of another part of the photovoltaic inverter;

[0038] Figure 6 This is a second schematic diagram of the structure of the photovoltaic inverter provided in the embodiments of this application;

[0039] Figure 7 for Figure 6 A bottom view of one part of the photovoltaic inverter in the image;

[0040] Figure 8 for Figure 6 A top view of one part of the photovoltaic inverter in the image;

[0041] Figure 9 This is the third schematic diagram of the structure of the photovoltaic inverter provided in the embodiments of this application;

[0042] Figure 10 for Figure 9 A top view of one part of the photovoltaic inverter in the image;

[0043] Figure 11 for Figure 9 A top view of another part of the photovoltaic inverter.

[0044] Figure label:

[0045] 01-Photovoltaic power station; 100-Photovoltaic inverter; 200-Photovoltaic module; 300-Transformer; 410-Grid; 420-Load;

[0046] 10 - First box; 11 - First wall surface;

[0047] 20 - Second box; 21 - Second wall;

[0048] 30 - Power devices;

[0049] 41-First circuit board; 42-Second circuit board;

[0050] 51 - First connecting terminal; 52 - Second connecting terminal; 53 - Third connecting terminal; 54 - Fourth connecting terminal;

[0051] 61-First heat sink; 611-First substrate; 612-First fin; 62-Second heat sink; 621-Second substrate; 622-Second fin;

[0052] 71 - First fan; 72 - Second fan;

[0053] 80 - Connecting cable;

[0054] 91 - First insulating component; 92 - Second insulating component. Detailed Implementation

[0055] 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.

[0056] Figure 1An exemplary photovoltaic power station 01 including a photovoltaic inverter is shown. For example, the photovoltaic power station 01 provided in this application embodiment is based on solar photovoltaic power generation and is suitable for supplying power to electrical equipment such as the power grid 410 or load 420. The load 420 may be electrical equipment using AC power, including but not limited to motors, fans, or air conditioners. The photovoltaic power station 01 includes a photovoltaic module 200, a photovoltaic inverter 100, and a transformer 300. The photovoltaic module 200 is used to convert solar energy into direct current (DC). The photovoltaic inverter 100 is used to convert the DC power generated by the photovoltaic module 200 into AC power and supply it to the transformer 300. The transformer 300 is used to step up or step down the AC power output by the photovoltaic inverter 100 before supplying it to the power grid 410 or the load 420.

[0057] For example, to connect the photovoltaic module 200 to the photovoltaic inverter 100, the photovoltaic inverter 100 is configured with multiple sets of DC input terminals on its DC side input end, serving as the electrical connection carrier between the photovoltaic module 200 and the photovoltaic inverter 100. However, as the power level of the photovoltaic inverter 100 increases, the number of DC input terminals of the photovoltaic inverter 100 increases significantly in order to connect with more photovoltaic modules. This results in a substantial increase in the area of ​​the bottom of the photovoltaic inverter 100's chassis where the DC input terminals are located, forcing a passive increase in the overall chassis volume. Based on this, this application proposes a new photovoltaic inverter 100 that can reduce the device size and improve the cost advantage of the device at high power levels.

[0058] The specific structure of the photovoltaic inverter 100 provided in this application will be described in detail below.

[0059] Figure 2 This is one of the structural schematic diagrams of the photovoltaic inverter 100 provided in the embodiments of this application. Figure 3 for Figure 2 A left view of a portion of the photovoltaic inverter 100. Figure 4 for Figure 2 A top view of a portion of the photovoltaic inverter 100. Figure 5 for Figure 2 A top view of another part of the photovoltaic inverter 100 is shown in the attached image. Figures 2 to 5 The photovoltaic inverter 100 includes multiple power devices 30, a first housing 10, a second housing 20, a first circuit board 41 located in the first housing 10, and a second circuit board 42 located in the second housing 20; a portion of the multiple power devices 30 is fixed to the first circuit board 41, and another portion of the multiple power devices 30 is fixed to the second circuit board 42.

[0060] That is, the photovoltaic inverter 100 of this application includes a first housing 10 and a second housing 20. The first housing 10 contains a first circuit board 41, on which at least some power devices 30 are mounted. The second housing 20 contains a second circuit board 42, on which at least some power devices 30 are mounted. When the photovoltaic inverter 100 is a photovoltaic inverter, the power devices 30 on the first circuit board 41 and the power devices 30 on the second circuit board 42 are electrically connected to jointly form a power conversion circuit, which can be used to convert the direct current (DC) power from the photovoltaic module into alternating current (AC).

[0061] In this application, the power device 30 located on the first circuit board 41 forms at least part of the first power conversion circuit, and the power device 30 located on the second circuit board 42 forms at least part of the second power conversion circuit. The specific functions of the circuit formed by the first power conversion circuit and the second power conversion circuit are not limited. For example, the first power conversion circuit is used to boost or buck DC power, and the second power conversion circuit is used to convert DC power into AC power.

[0062] This application establishes a first enclosure 10 and a second enclosure 20, with the power devices 30 on the first circuit board 41 within the first enclosure 10 forming at least a portion of the first power conversion circuit, and the power devices 30 on the second circuit board 42 within the second enclosure 20 forming at least a portion of the second power conversion circuit. Thus, the power devices 30 in the first enclosure 10 are used to boost or buck DC power, while the power devices 30 in the second enclosure 20 are used to convert DC power to AC power. This separate arrangement of the first and second power conversion circuits, with their different functions, avoids concentrated heat accumulation in both circuits, reducing the risk of localized temperature rise and extending the lifespan of the photovoltaic inverter 100. Furthermore, the separate placement of the first and second power conversion circuits within different enclosures achieves physical isolation, reducing the risk of signal interference. Additionally, this separate arrangement facilitates independent replacement of different modules, simplifying the later maintenance of the photovoltaic inverter 100.

[0063] In some examples, the first housing includes other circuit boards in addition to the first circuit board 41, which are provided with power devices 30. The first circuit board 41 and the power devices 30 on the circuit board are electrically connected to form a first power conversion circuit; or, the power devices 30 located on the first circuit board 41 form the entire first power conversion circuit.

[0064] Similarly, in some examples, in addition to the second circuit board 42, the second housing also includes other circuit boards, on which power devices 30 are provided. The second circuit board 42 and the power devices 30 on the circuit board are electrically connected to form a second power conversion circuit together; or, the power devices 30 located on the second circuit board 42 form the entire second power conversion circuit.

[0065] Of course, the first power conversion circuit used to boost or buck DC power and the second power conversion circuit used to convert DC power to AC power are merely one example of this application. In other embodiments, the first power conversion circuit may be used to convert DC power to AC power, and the second power conversion circuit may be used to boost or buck DC power. That is, the functions of the first power conversion circuit and the second power conversion circuit can be interchanged.

[0066] For example, in conjunction with reference Figure 2 , Figure 4 and Figure 5 As shown, the photovoltaic inverter 100 also includes a first connection terminal 51 and a second connection terminal 52; one end of the first connection terminal 51 is used for electrical connection with the photovoltaic module, the other end of the first connection terminal 51 is electrically connected to the first circuit board 41, the first circuit board 41 is electrically connected to the second circuit board 42, the second circuit board 42 is electrically connected to one end of the second connection terminal 52, and the other end of the second connection terminal 52 is used for electrical connection with the power grid or load.

[0067] The electrical connection between the first connecting terminal 51 and the first circuit board 41 can be achieved via a connecting cable or via a conductive connector. That is, the first connecting terminal 51 and the first circuit board 41 are electrically connected via a connecting cable, or via a conductive connector. Similarly, the first circuit board 41 and the second circuit board 42 are electrically connected via a connecting cable, or via a conductive connector; the second circuit board 42 is electrically connected to one end of the second connecting terminal 52 via a connecting cable, or via a conductive connector.

[0068] Figure 3 It shows Figure 2 A left view of the first housing 10 and the first connection terminal 51 in the photovoltaic inverter 100, combined with Figure 2 and Figure 3 It can be seen that the first connecting terminal 51 is fixed to the first housing 10 and is at least partially located outside the first housing 10. From Figure 2 As can be seen, the second connecting terminal 52 is fixed to the second housing 20 and is at least partially located outside the second housing 20.

[0069] That is, the first connection terminal 51 of this application is fixed to the first housing 10, and the second connection terminal 52 is fixed to the second housing 20. The photovoltaic inverter 100 of this application, by setting up the first housing 10 and the second housing 20, such that a portion of the first circuit board 41 and a plurality of power devices 30 are located inside the first housing 10, and another portion of the second circuit board 42 and a plurality of power devices 30 are located inside the second housing 20, and such that the first connection terminal 51 for electrical connection with the photovoltaic module is fixed to the first housing 10 and at least partially located outside the first housing 10, and the second connection terminal 52 for electrical connection with the grid or load is fixed to the second housing 20 and at least partially located outside the second housing 20. Thus, when the photovoltaic inverter 100 adopts a high power level and requires a corresponding increase in the number of first connection terminals 51, since the numerous first connection terminals 51 electrically connected to the photovoltaic module are all located in the first housing 10, increasing the number of first connection terminals 51 will only increase the volume of the first housing 10. As for the second housing 20, the increase in the number of first connecting terminals 51 will not affect the volume of the second housing 20, and the second housing 20 can still maintain its original volume.

[0070] Compared to the photovoltaic inverter 100, which uses a single enclosure to house the first circuit board 41, the second circuit board 42, and multiple power devices 30 (in this scheme, due to the increase in power level, the addition of numerous first connection terminals 51 results in an increase in the area of ​​the wall surface of the enclosure with the first connection terminals 51, which significantly increases the overall volume of the enclosure), this application divides the enclosure into two parts (the first enclosure 10 and the second enclosure 20). This allows the volume of the enclosure without the first connection terminals 51 (i.e., the second enclosure 20) to be decoupled from the increase in power level, so that the volume of the second enclosure 20 is not affected by the power level of the photovoltaic inverter 100. Therefore, in the case of high power level, this application can reduce the volume of the photovoltaic inverter 100 and improve the cost advantage of the photovoltaic inverter 100.

[0071] In addition, this application divides the enclosure into two parts (the first enclosure 10 and the second enclosure 20), and arranges the first circuit board 41 and some power devices 30 in the first enclosure 10, and arranges the second circuit board 42 and other power devices 30 in the second enclosure 20. This also disperses the heat source and reduces the heat dissipation path coupling problem of multiple power devices 30 to a certain extent, thereby improving the heat dissipation effect.

[0072] For example, the electrical connection between the first circuit board 41 and the second circuit board 42 can be achieved by connecting cables or by connecting terminals.

[0073] In some embodiments, reference is made to Figure 2 , Figure 4and Figure 5 As shown, the photovoltaic inverter 100 also includes a third connection terminal 53 and a fourth connection terminal 54. One end of the third connection terminal 53 is electrically connected to the first circuit board 41, the other end of the third connection terminal 53 is electrically connected to one end of the fourth connection terminal 54, and the other end of the fourth connection terminal 54 is electrically connected to the second circuit board 42.

[0074] The third connecting terminal 53 and the first circuit board 41 can be directly or indirectly electrically connected. When the third connecting terminal 53 and the first circuit board 41 are indirectly connected, they are connected through a conductive connector or a connecting cable. Similarly, the fourth connecting terminal 54 and the second circuit board 42 can be directly or indirectly electrically connected. When the fourth connecting terminal 54 and the second circuit board 42 are indirectly connected, they are connected through a conductive connector or a connecting cable.

[0075] In this embodiment, the third connecting terminal 53 is fixed to the first housing 10 and is at least partially located outside the first housing 10, and the fourth connecting terminal 54 is fixed to the second housing 20 and is at least partially located outside the second housing 20.

[0076] That is, at least a portion of the third connection terminal 53 of this application is located outside the first housing 10, and at least a portion of the fourth connection terminal 54 is located outside the second housing 20. By setting the third connection terminal 53 and the fourth connection terminal 54, when realizing the electrical connection between the first circuit board 41 and the second circuit board 42, the electrical signal of the first circuit board 41 can be led out outside the first housing 10 through the electrical connection of the third connection terminal 53 to the first circuit board 41; at the same time, the electrical signal of the second circuit board 42 can be led out outside the second housing 20 through the electrical connection of the fourth connection terminal 54 to the second circuit board 42. In this way, when wiring, it is only necessary to electrically connect the third connection terminal 53 and the fourth connection terminal 54 together outside the first housing 10 and the second housing 20 to realize the electrical connection between the first circuit board 41 and the second circuit board 42. That is, with this structural design, when the first circuit board 41 and the second circuit board 42 located in different enclosures are electrically connected, it is not necessary to open the first enclosure 10 and the second enclosure 20. This facilitates wiring operations and avoids damaging the sealing of the first enclosure 10 and the second enclosure 20, thereby improving the sealing performance of the photovoltaic inverter 100.

[0077] Furthermore, this application does not limit the specific connection method of the third connection terminal 53 and the fourth connection terminal 54. The specific connection method of the third connection terminal 53 and the fourth connection terminal 54 will be described below by way of example.

[0078] (1) One of the connection methods of the third connection terminal 53 and the fourth connection terminal 54: the third connection terminal 53 and the fourth connection terminal 54 are plugged in and plugged out.

[0079] For example, one of the third connecting terminal 53 and the fourth connecting terminal 54 has a connecting block, and the other of the third connecting terminal 53 and the fourth connecting terminal 54 has a groove into which the connecting block is inserted.

[0080] For example, the third connecting terminal 53 has a groove (commonly known as a female head), and the fourth connecting terminal 54 has a connecting block (commonly known as a male head), with the connecting block inserted into the groove; or, the third connecting terminal 53 has a connecting block, and the fourth connecting terminal 54 has a groove, with the connecting block inserted into the groove.

[0081] The plug-in connection method used for the third connection terminal 53 and the fourth connection terminal 54 avoids the introduction of other electrical connectors, thus reducing the number of components in the photovoltaic inverter 100. Furthermore, it shortens the distance between the first enclosure 10 and the second enclosure 20, preventing safety hazards caused by exposed electrical connectors when such a long distance exists between them.

[0082] (2) Another connection method between the third connecting terminal 53 and the fourth connecting terminal 54: such as Figure 2 As shown, the photovoltaic inverter 100 also includes a connecting cable 80, one end of which is connected to the third connecting terminal 53, and the other end of which is connected to the fourth connecting terminal 54; or, the photovoltaic inverter 100 also includes a conductive connecting bar, one end of which is connected to the third connecting terminal 53, and the other end of which is connected to the fourth connecting terminal 54.

[0083] That is, in addition to plug-in connection, the third connection terminal 53 and the fourth connection terminal 54 can also be electrically connected by a connection cable 80 or a conductive connector. One end of the connection cable 80 or the conductive connector is connected to the third connection terminal 53, and the other end of the connection cable 80 or the conductive connector is connected to the fourth connection terminal 54.

[0084] The third connecting terminal 53 and the fourth connecting terminal 54 are electrically connected using a connecting cable 80 or a conductive connector. The wiring methods of the connecting cable 80 or the conductive connector are relatively simple. When the connecting cable 80 or the conductive connector is used to connect the third connecting terminal 53 and the fourth connecting terminal 54, the requirements for the arrangement of the third connecting terminal 53 and the fourth connecting terminal 54, as well as the arrangement of the first housing 10 and the second housing 20, are relatively low. It has a high tolerance for installation error and can change the arrangement of the first housing 10 and the second housing 20 according to the space requirements of the actual application scenario.

[0085] The specific layout of the first connection terminal 51, the second connection terminal 52, the third connection terminal 53, and the fourth connection terminal 54 is determined according to the actual application scenario requirements. For example, when the photovoltaic inverter 100 is arranged in a space with limited height, the first connection terminal 51, the second connection terminal 52, the third connection terminal 53, and the fourth connection terminal 54 are distributed horizontally; or, for example, when the photovoltaic inverter 100 is arranged in a space with limited length, the first connection terminal 51, the second connection terminal 52, the third connection terminal 53, and the fourth connection terminal 54 are distributed vertically.

[0086] For example, the first enclosure 10 and the second enclosure 20 are arranged adjacent to each other and are very close to each other. In this way, the wiring between the third connection terminal 53 of the first enclosure 10 and the fourth connection terminal 54 of the second enclosure 20 is shorter, eliminating the need to install fuses or circuit breakers at the wiring points of the third connection terminal 53 and the fourth connection terminal 54 for safety reasons. This reduces the cost of the photovoltaic inverter 100, and eliminating these devices avoids the reliability risks caused by their failure or malfunction.

[0087] The first box 10 and the second box 20 are arranged adjacent to each other and are very close together. For example, the distance between the first box 10 and the second box 20 is less than or equal to half the dimension of the first box 10 along the arrangement direction of the first box 10 and the second box 20; or, the gap between the first box 10 and the second box 20 along the arrangement direction of the first box 10 and the second box 20 is less than or equal to half the dimension of the second box 20 along the arrangement direction of the first box 10 and the second box 20.

[0088] This application does not limit the layout of the first connecting terminal 51, the second connecting terminal 52, the third connecting terminal 53 and the fourth connecting terminal 54. The specific arrangement of the first connecting terminal 51, the second connecting terminal 52, the third connecting terminal 53 and the fourth connecting terminal 54 will be illustrated by example below.

[0089] (1) A first layout of the first connecting terminal 51, the second connecting terminal 52, the third connecting terminal 53, and the fourth connecting terminal 54:

[0090] like Figure 2 As shown, the portion of the first connecting terminal 51 outside the first housing 10 is located on the side of the first housing 10 away from the second housing 20, and the portion of the third connecting terminal 53 outside the first housing 10 is located on the side of the first housing 10 facing the second housing 20. The portion of the fourth connecting terminal 54 outside the second housing 20 is located on the side of the second housing 20 facing the first housing 10, and the portion of the second connecting terminal 52 outside the second housing 20 is located on the side of the second housing 20 away from the first housing 10.

[0091] In the above layout method, corresponding to Figure 2 In the orientation shown, for example, the first connecting terminal 51, the third connecting terminal 53, the fourth connecting terminal 54, and the second connecting terminal 52 are arranged sequentially from left to right.

[0092] The first connection terminal 51, the second connection terminal 52, the third connection terminal 53, and the fourth connection terminal 54 are arranged as described above. The first connection terminal 51, the third connection terminal 53, the fourth connection terminal 54, and the second connection terminal 52 are arranged sequentially along the arrangement direction of the first housing 10 and the second housing 20. This arrangement only occupies the dimensions of the photovoltaic inverter 100 in the arrangement direction of the first housing 10 and the second housing 20, saving the dimensions perpendicular to the arrangement direction of the first housing 10 and the second housing 20. Thus, the photovoltaic inverter 100 can be used in spaces limited by the arrangement direction perpendicular to the first housing 10 and the second housing 20, meeting the application requirements of the photovoltaic inverter 100 in special application scenarios.

[0093] The arrangement of the third connection terminal 53 and the fourth connection terminal 54 from left to right is merely an example and not a limitation on their layout. In some embodiments, to reduce the size of the photovoltaic inverter 100 in the arrangement direction of the first housing 10 and the second housing 20, thereby miniaturizing the photovoltaic inverter 100, the third connection terminal 53 and the fourth connection terminal 54 are arranged perpendicular to the arrangement direction of the first housing 10 and the second housing 20. That is, corresponding to... Figure 2 In the orientation shown, the third connecting terminal 53 and the fourth connecting terminal 54 can, in addition to being able to... Figure 2 In addition to the left-right layout shown, it can also be laid out in the front-back direction (in...). Figure 2 In the directions shown, the front-back direction refers to the direction perpendicular to the paper, and it can also be arranged in the up-down direction.

[0094] (2) A second layout of the first connecting terminal 51, the second connecting terminal 52, the third connecting terminal 53, and the fourth connecting terminal 54:

[0095] Figure 6 This is the second schematic diagram of the structure of the photovoltaic inverter 100 provided in the embodiments of this application. Figure 7 for Figure 6 A bottom view of a portion of the photovoltaic inverter 100. Figure 7 The positional relationship between the first connecting terminal 51 and the first housing 10 is shown in the figure. Figure 8 for Figure 6 A top view of a portion of the photovoltaic inverter 100. Figure 8 The diagram shows the positional relationship between the first housing 10 and its internal components, the first connecting terminal 51, and the third connecting terminal 53. Among them, in... Figure 6 In the photovoltaic inverter 100 shown, the positional relationship between the second housing 20 and its internal components, the fourth connection terminal 54 and the second connection terminal 52 is as follows: Figure 5 The same applies; please refer to the relevant content. Figure 5 As shown.

[0096] like Figures 6 to 8 As shown, the portion of the third connecting terminal 53 outside the first housing 10 is located on the side of the first housing 10 facing the second housing 20; the portion of the fourth connecting terminal 54 outside the second housing 20 is located on the side of the second housing 20 facing the first housing 10; and the portion of the second connecting terminal 52 outside the second housing 20 is located on the side of the second housing 20 away from the first housing 10. The arrangement direction of the first connecting terminal 51 and the first housing 10 is perpendicular to the arrangement direction of the third connecting terminal 53 and the first housing 10.

[0097] That is, in the second layout of the first connecting terminal 51, the second connecting terminal 52, the third connecting terminal 53 and the fourth connecting terminal 54, compared with the first layout, the portion of the first connecting terminal 51 outside the first housing 10 is not located on the side of the first housing 10 away from the second housing 20. Instead, the arrangement direction of the first connecting terminal 51 and the first housing 10 is perpendicular to the arrangement direction of the third connecting terminal 53 and the first housing 10. In other words, the portion of the first connecting terminal 51 outside the first housing 10 and the portion of the third connecting terminal 53 outside the first housing 10 are located on adjacent sides of the first housing 10.

[0098] The first connecting terminal 51, the second connecting terminal 52, the third connecting terminal 53, and the fourth connecting terminal 54 are arranged in this way. The arrangement of the third connecting terminal 53, the fourth connecting terminal 54, and the second connecting terminal 52 occupies the dimensions of the photovoltaic inverter 100 in the direction of arrangement of the first housing 10 and the second housing 20, which can save a certain amount of space perpendicular to the direction of arrangement of the first housing 10 and the second housing 20. The arrangement direction of the first connecting terminal 51 and the first housing 10 is perpendicular to the arrangement direction of the third connecting terminal 53 and the first housing 10. That is, the first connecting terminal 51 is partially set on the side of the first housing 10 adjacent to the third connecting terminal 53. In this way, this layout is more suitable when the first housing 10 of the photovoltaic inverter 100 is installed at a corner; or, when there is a certain space capacity in the direction perpendicular to the first housing 10 and the second housing 20, this layout can make effective use of space.

[0099] When the first connecting terminal 51, the second connecting terminal 52, the third connecting terminal 53, and the fourth connecting terminal 54 adopt the aforementioned first or second layout, in some embodiments, combined with Figure 2 , Figure 4 and Figure 5 As shown (or in combination) Figure 6 , Figure 8 and Figure 5 As shown, the photovoltaic inverter 100 also includes a plurality of first fins 612 and a plurality of second fins 622. The plurality of first fins 612 protrude from the first wall surface 11 of the first housing 10 in a direction away from the first housing 10, and the plurality of second fins 622 protrude from the second wall surface 21 of the second housing 20 in a direction away from the second housing 20; the first wall surface 11 and the second wall surface 21 are both located on the same side of the first housing 10. The arrangement direction of the plurality of first fins 612 is parallel to the arrangement direction of the first housing 10 and the second housing 20, and the arrangement direction of the plurality of second fins 622 is parallel to the arrangement direction of the first housing 10 and the second housing 20.

[0100] In this configuration, multiple first fins 612 protrude from the first wall surface 11 of the first housing 10 in a direction away from the first housing 10. One end of each of the multiple first fins 612 can be directly connected to the first wall surface 11 of the first housing 10, or one end of each of the multiple first fins 612 can be indirectly connected to the first wall surface 11 of the first housing 10. For example, when one end of each of the multiple first fins 612 is indirectly connected to the first wall surface 11 of the first housing 10... Figure 4 or Figure 8 As shown, the photovoltaic inverter 100 also includes a first substrate 611, with one end of each of the plurality of first fins 612 fixed to the first substrate 611, and the first substrate 611 fixed to the first wall surface 11. At this time, the first substrate 611 and the plurality of first fins 612 together form a first heat sink 61 for dissipating heat from the power devices 30 on the first circuit board 41.

[0101] In order to improve the heat dissipation efficiency of the power device 30 on the first circuit board 41, for example, an opening is provided on the first housing 10, the side of the power device 30 on the first circuit board 41 facing away from the first circuit board 41 is fixed to one side of the first insulating member 91, and the other side of the first insulating member 91 passes through the opening and is fixed to the first substrate 611.

[0102] Similarly, multiple second fins 622 protrude from the second wall surface 21 of the second housing 20 in a direction away from the second housing 20. One end of each second fin 622 can be directly connected to the second wall surface 21 of the second housing 20, or one end of each second fin 622 can be indirectly connected to the second wall surface 21 of the second housing 20. For example, when one end of each second fin 622 is indirectly connected to the second wall surface 21 of the second housing 20... Figure 5 As shown, the photovoltaic inverter 100 also includes a second substrate 621, with one end of each of the plurality of second fins 622 fixed to the second substrate 621, and the second substrate 621 fixed to the second wall surface 21. In this case, the second substrate 621 and the plurality of second fins 622 together form a second heat sink 62 for dissipating heat from the power devices 30 on the second circuit board 42.

[0103] To improve the heat dissipation efficiency of the power device 30 on the second circuit board 42, for example, an opening is provided on the second housing 20, and the side of the power device 30 on the second circuit board 42 facing away from the second circuit board 42 is fixed to one side of the second insulating member 92, and the other side of the second insulating member 92 passes through the opening and is fixed to the second substrate 621.

[0104] This application improves the heat dissipation effect of the multiple power devices 30 of the photovoltaic inverter 100 by setting multiple first fins 612 and multiple second fins 622. The multiple first fins 612 increase the heat dissipation area of ​​the power devices 30 on the first circuit board 41, and the multiple second fins 622 increase the heat dissipation area of ​​the power devices 30 on the second circuit board 42.

[0105] The arrangement direction of the multiple first fins 612 is parallel to the arrangement direction of the first housing 10 and the second housing 20. Thus, the gap between two adjacent first fins 612 (i.e., the heat dissipation channel) is perpendicular to the arrangement direction of the first housing 10 and the second housing 20. Therefore, when the first housing 10 and the second housing 20 are arranged horizontally, the heat dissipation channel is vertically positioned. The hot air generated by the power device 30, being less dense than cold air, will rise from bottom to top. In this case, the vertical arrangement of the heat dissipation channel utilizes the upward tendency of hot air, allowing heat to be transferred upwards. Therefore, heat within the first housing 10 will not be transferred to the second housing 20, and vice versa. Simultaneously, since the first fins 612 and the second fins 622 are both located outside the housing, the heat transferred upwards during fin heat dissipation will be conducted to the external environment and will not affect the power device 30. Therefore, the layout method of this application can improve the problem of heat dissipation path coupling and improve the heat dissipation effect by utilizing the upward tendency of hot air. Figure 2 , Figure 6 and Figure 9The dashed lines with arrows in the diagram represent the direction of heat movement, i.e., the direction of heat dissipation path.

[0106] In some embodiments, in conjunction with reference Figure 2 , Figure 4 and Figure 5 As shown, the photovoltaic inverter 100 also includes a first fan 71 and a second fan 72. The first fan 71 is fixed to the first housing 10, and the arrangement direction of the first fan 71 and the plurality of first fins 612 is perpendicular to the arrangement direction of the first housing 10 and the second housing 20. The second fan 72 is fixed to the second housing 20, and the arrangement direction of the second fan 72 and the plurality of second fins 622 is perpendicular to the arrangement direction of the first housing 10 and the second housing 20.

[0107] This application provides a first fan 71 and a second fan 72, which can force airflow and improve heat dissipation efficiency, thereby enhancing the heat dissipation effect of the photovoltaic inverter 100.

[0108] For example, the first fan 71 is located below the plurality of first fins 612, that is, the first fan 71 is located below the heat dissipation channel. Similarly, the second fan 72 is located below the plurality of second fins 622, that is, the second fan 72 is located below the heat dissipation channel. In this way, the heat dissipation effect is better.

[0109] (3) A third layout of the first connecting terminal 51, the second connecting terminal 52, the third connecting terminal 53, and the fourth connecting terminal 54:

[0110] Figure 9 This is the third schematic diagram of the structure of the photovoltaic inverter 100 provided in the embodiments of this application. Figure 10 for Figure 9 A top view of a portion of the photovoltaic inverter 100. Figure 10 The diagram shows the positional relationship between the first housing 10 and its internal components, the first connecting terminal 51 and the third connecting terminal 53. Figure 11 for Figure 9 A top view of another part of the photovoltaic inverter 100. Figure 11 The diagram shows the positional relationship between the second housing 20 and its internal components, the fourth connecting terminal 54, and the second connecting terminal 52.

[0111] Please refer to the reference. Figures 9 to 11The portion of the first connecting terminal 51 outside the first housing 10 is located on the side of the first housing 10 opposite to the second housing 20. The arrangement direction of the third connecting terminal 53 and the first housing 10 is perpendicular to the arrangement direction of the first connecting terminal 51 and the first housing 10. The arrangement direction of the fourth connecting terminal 54 and the second connecting terminal 52 is perpendicular to the arrangement direction of the first housing 10 and the second housing 20; the arrangement direction of the third connecting terminal 53 and the fourth connecting terminal 54 is parallel to the arrangement direction of the first housing 10 and the second housing 20.

[0112] The first connecting terminal 51, the second connecting terminal 52, the third connecting terminal 53, and the fourth connecting terminal 54, when arranged side-by-side along the arrangement direction of the first housing 10 and the second housing 20, occupy less space in that direction and effectively utilize the dimensions of the photovoltaic inverter 100 perpendicular to the arrangement direction of the first housing 10 and the second housing 20. This layout results in a more regular overall structure for the photovoltaic inverter 100, suitable for conventional applications. Furthermore, in scenarios with a large vertical space, the photovoltaic inverter 100 of this application can also be arranged vertically with the first housing 10 and the second housing 20 positioned below the second housing 20. This places the first connecting terminal 51 at the bottom of the photovoltaic inverter 100, facilitating wiring between the first connecting terminal 51 and the photovoltaic module.

[0113] Furthermore, in this application, the arrangement direction of the third connecting terminal 53 and the fourth connecting terminal 54 is parallel to the arrangement direction of the first housing 10 and the second housing 20, for example, as Figure 9 As shown, the third connection terminal 53 is located on the right side of the first housing 10, and the fourth connection terminal 54 is located on the right side of the second housing 20. In this way, the third connection terminal 53 and the fourth connection terminal 54 are closer in position, which also facilitates wiring between the two.

[0114] When the first connecting terminal 51, the second connecting terminal 52, the third connecting terminal 53, and the fourth connecting terminal 54 adopt the third layout, in some embodiments, combined with Figures 9 to 11As shown, the photovoltaic inverter 100 also includes a plurality of first fins 612 and a plurality of second fins 622. The plurality of first fins 612 protrude from the first wall surface 11 of the first housing 10 in a direction away from the first housing 10, and the plurality of second fins 622 protrude from the second wall surface 21 of the second housing 20 in a direction away from the second housing 20; the first wall surface 11 and the second wall surface 21 are both located on the same side of the first housing 10. The arrangement direction of the plurality of first fins 612 is parallel to the arrangement direction of the first housing 10 and the second housing 20, and the arrangement direction of the plurality of second fins 622 is perpendicular to the arrangement direction of the first housing 10 and the second housing 20.

[0115] Similarly to the aforementioned layout, multiple first fins 612 protrude from the first wall surface 11 of the first housing 10 in a direction away from the first housing 10. One end of each of the multiple first fins 612 can be directly connected to the first wall surface 11 of the first housing 10, or one end of each of the multiple first fins 612 can be indirectly connected to the first wall surface 11 of the first housing 10. For example, when one end of each of the multiple first fins 612 is indirectly connected to the first wall surface 11 of the first housing 10... Figure 10 As shown, the photovoltaic inverter 100 also includes a first substrate 611, with one end of each of the plurality of first fins 612 fixed to the first substrate 611, and the first substrate 611 fixed to the first wall surface 11. At this time, the first substrate 611 and the plurality of first fins 612 together form a first heat sink 61 for dissipating heat from the power devices 30 on the first circuit board 41.

[0116] In order to improve the heat dissipation efficiency of the power device 30 on the first circuit board 41, an opening is provided on the first housing 10. The side of the power device 30 on the first circuit board 41 facing away from the first circuit board 41 is fixed to one side of the first insulating member 91, and the other side of the first insulating member 91 passes through the opening and is fixed to the first substrate 611.

[0117] Similarly, multiple second fins 622 protrude from the second wall surface 21 of the second housing 20 in a direction away from the second housing 20. One end of each second fin 622 can be directly connected to the second wall surface 21 of the second housing 20, or one end of each second fin 622 can be indirectly connected to the second wall surface 21 of the second housing 20. For example, when one end of each second fin 622 is indirectly connected to the second wall surface 21 of the second housing 20... Figure 11 As shown, the photovoltaic inverter 100 also includes a second substrate 621, with one end of each of the plurality of second fins 622 fixed to the second substrate 621, and the second substrate 621 fixed to the second wall surface 21. In this case, the second substrate 621 and the plurality of second fins 622 together form a second heat sink 62 for dissipating heat from the power devices 30 on the second circuit board 42.

[0118] In order to improve the heat dissipation efficiency of the power device 30 on the second circuit board 42, an opening is provided on the second housing 20. The side of the power device 30 on the second circuit board 42 facing away from the second circuit board 42 is fixed to one side of the second insulating member 92, and the other side of the second insulating member 92 passes through the opening and is fixed to the second substrate 621.

[0119] By setting multiple first fins 612 and multiple second fins 622, the heat dissipation area of ​​the power device 30 on the first circuit board 41 can be increased by the multiple first fins 612, and the heat dissipation area of ​​the power device 30 on the second circuit board 42 can be increased by the second fins 622, thereby improving the heat dissipation effect of the multiple power devices 30 of the photovoltaic inverter 100.

[0120] The arrangement direction of the multiple first fins 612 is parallel to the arrangement direction of the first housing 10 and the second housing 20, and the arrangement direction of the multiple second fins 622 is perpendicular to the arrangement direction of the first housing 10 and the second housing 20. Thus, the gap (i.e., the heat dissipation channel) between two adjacent first fins 612 is perpendicular to the arrangement direction of the first housing 10 and the second housing 20, and the gap (i.e., the heat dissipation channel) between two adjacent second fins 622 is parallel to the arrangement direction of the first housing 10 and the second housing 20. Therefore, when the first housing 10 and the second housing 20 are arranged vertically, and the first housing 10 is below the second housing 20, the heat dissipation channels of the multiple first fins 612 are horizontally arranged, and the heat dissipation channels of the multiple second fins 622 are vertically arranged. The hot air generated by the power devices 30 inside the second housing 20 can be horizontally discharged, without affecting the heat dissipation of the power devices 30 inside the second housing 20 located above the first housing 10. The hot air generated by the power device 30 inside the second enclosure 20 can be vertically discharged. Since the density of hot air is lower than that of cold air, the heat from the power device 30 inside the second enclosure 20 will be transferred from bottom to top. At this time, the vertical setting of the heat dissipation channel corresponding to the second enclosure 20 of this application can take advantage of the characteristic that hot air tends to rise, so that the heat is transferred upward and the heat dissipation effect is better.

[0121] That is, by adopting a third layout for each terminal in combination with the layout of the first fin 612 and the second fin 622, this application can improve the problem of heat dissipation path coupling and can improve the heat dissipation effect by utilizing the characteristic that hot air tends to rise.

[0122] When the first housing 10 is located below the second housing 20, in order to avoid the multiple first fins 612 corresponding to the first housing 10 affecting or interfering with the heat dissipation path of the multiple second fins 622 corresponding to the second housing 20, in some embodiments, there is a gap between every two adjacent second fins 622; along the arrangement direction of the first housing 10 and the second housing 20, the gap between at least two second fins 622 is staggered with the multiple first fins 612.

[0123] That is, the gaps between at least two second fins 622 are staggered with the plurality of first fins 612, wherein there is a gap between each pair of adjacent second fins 622, and the plurality of second fins 622 have multiple heat dissipation channels, and the gap between at least two second fins 622 refers to at least one heat dissipation channel. In other words, at least one heat dissipation channel is staggered with the plurality of first fins 612 along the arrangement direction of the first housing 10 and the second housing 20. In this way, at least one heat dissipation channel among the plurality of second fins 622 is not affected by the plurality of first fins 612, thereby improving the heat dissipation effect of the second fins 622.

[0124] At least one heat dissipation channel and multiple first fins 612 are staggered along the arrangement direction of the first housing 10 and the second housing 20, corresponding to... Figure 9 The orientation shown refers to the vertical direction (the arrangement direction of the first box 10 and the second box 20 is in...). Figure 9 In the orientation of the first fins 612 (vertical direction), at least one heat dissipation channel of the plurality of second fins 622 is offset from the plurality of first fins 612. For example, in the vertical direction, at least one heat dissipation channel of the plurality of second fins 622 is located to the left or right of the vertical line passing through the plurality of first fins 612; or, in the vertical direction, the plurality of first fins 612 are located to the left or right of the vertical line passing through at least one heat dissipation channel of the plurality of second fins 622.

[0125] In some embodiments, in conjunction with reference Figures 9 to 11 As shown, the photovoltaic inverter 100 also includes a first fan 71 and a second fan 72. The first fan 71 is fixed to the first housing 10, and the arrangement direction of the first fan 71 and the plurality of first fins 612 is perpendicular to the arrangement direction of the first housing 10 and the second housing 20. The second fan 72 is fixed to the second housing 20, and the second fan 72 is located between the plurality of second fins 622 and the plurality of first fins 612.

[0126] This application, by setting a first fan 71 and a second fan 72, enables forced airflow and improves heat dissipation efficiency, thereby enhancing the heat dissipation effect of the photovoltaic inverter 100. Specifically, the arrangement direction of the first fan 71 and the plurality of first fins 612 is perpendicular to the arrangement direction of the first housing 10 and the second housing 20. Thus, the first fan 71 can blow air onto the plurality of first fins 612 in the arrangement direction perpendicular to the first housing 10 and the second housing 20, thereby enhancing the heat dissipation effect of the first fins 612; similarly, the second fan 72 can blow air onto the plurality of second fins 622 in the arrangement direction of the first housing 10 and the second housing 20, thereby enhancing the heat dissipation effect of the second fins 622.

[0127] For example, the second fan 72 is located between the multiple second fins 622 and the multiple first fins 612. In this way, the second fan 72 is located below the heat dissipation channel of the multiple second fins 622, resulting in better heat dissipation.

[0128] 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 photovoltaic inverter, characterized in that, The photovoltaic inverter includes multiple power devices, a first enclosure, a second enclosure, a first circuit board located inside the first enclosure, and a second circuit board located inside the second enclosure; a portion of the multiple power devices is fixed to the first circuit board, and another portion of the multiple power devices is fixed to the second circuit board; The photovoltaic inverter further includes a first connection terminal and a second connection terminal; one end of the first connection terminal is used to be electrically connected to the photovoltaic module, the other end of the first connection terminal is electrically connected to the first circuit board, the first circuit board is electrically connected to the second circuit board, the second circuit board is electrically connected to one end of the second connection terminal, and the other end of the second connection terminal is used to be electrically connected to the power grid or a load. The first connecting terminal is fixed to the first housing and is at least partially located outside the first housing, and the second connecting terminal is fixed to the second housing and is at least partially located outside the second housing.

2. The photovoltaic inverter according to claim 1, characterized in that, The photovoltaic inverter further includes a third connection terminal and a fourth connection terminal. One end of the third connection terminal is electrically connected to the first circuit board, the other end of the third connection terminal is electrically connected to one end of the fourth connection terminal, and the other end of the fourth connection terminal is electrically connected to the second circuit board. The third connecting terminal is fixed to the first housing and is at least partially located outside the first housing, and the fourth connecting terminal is fixed to the second housing and is at least partially located outside the second housing.

3. The photovoltaic inverter according to claim 2, characterized in that, The portion of the first connecting terminal outside the first housing is located on the side of the first housing away from the second housing, and the portion of the third connecting terminal outside the first housing is located on the side of the first housing facing the second housing. The portion of the fourth connection terminal located outside the second housing is located on the side of the second housing facing the first housing, while the portion of the second connection terminal located outside the second housing is located on the side of the second housing away from the first housing.

4. The photovoltaic inverter according to claim 2, characterized in that, The portion of the third connecting terminal outside the first housing is located on the side of the first housing facing the second housing; the portion of the fourth connecting terminal outside the second housing is located on the side of the second housing facing the first housing; and the portion of the second connecting terminal outside the second housing is located on the side of the second housing away from the first housing. The arrangement direction of the first connecting terminal and the first housing is perpendicular to the arrangement direction of the third connecting terminal and the first housing.

5. The photovoltaic inverter according to claim 3 or 4, characterized in that, The photovoltaic inverter further includes multiple first fins and multiple second fins. The multiple first fins protrude from the first wall of the first housing in a direction away from the first housing, and the multiple second fins protrude from the second wall of the second housing in a direction away from the second housing. The first wall and the second wall are both located on the same side of the first housing. The arrangement direction of the plurality of first fins is parallel to the arrangement direction of the first housing and the second housing, and the arrangement direction of the plurality of second fins is parallel to the arrangement direction of the first housing and the second housing.

6. The photovoltaic inverter according to claim 5, characterized in that, The photovoltaic inverter also includes a first fan and a second fan. The first fan is fixed to the first housing, and the arrangement direction of the first fan and the plurality of first fins is perpendicular to the arrangement direction of the first housing and the second housing. The second fan is fixed to the second housing, and the arrangement direction of the second fan and the plurality of second fins is perpendicular to the arrangement direction of the first housing and the second housing.

7. The photovoltaic inverter according to claim 2, characterized in that, The portion of the first connecting terminal located outside the first housing is disposed on the side of the first housing facing away from the second housing, and the arrangement direction of the third connecting terminal and the first housing is perpendicular to the arrangement direction of the first connecting terminal and the first housing; The arrangement direction of the fourth connecting terminal and the second connecting terminal is perpendicular to the arrangement direction of the first housing and the second housing; the arrangement direction of the third connecting terminal and the fourth connecting terminal is parallel to the arrangement direction of the first housing and the second housing.

8. The photovoltaic inverter according to claim 7, characterized in that, The photovoltaic inverter further includes multiple first fins and multiple second fins. The multiple first fins protrude from the first wall of the first housing in a direction away from the first housing, and the multiple second fins protrude from the second wall of the second housing in a direction away from the second housing. The first wall and the second wall are both located on the same side of the first housing. The arrangement direction of the plurality of first fins is parallel to the arrangement direction of the first housing and the second housing, and the arrangement direction of the plurality of second fins is perpendicular to the arrangement direction of the first housing and the second housing.

9. The photovoltaic inverter according to claim 8, characterized in that, There is a gap between each two adjacent second fins; along the arrangement direction of the first housing and the second housing, the gaps between at least two second fins are staggered with the plurality of first fins.

10. The photovoltaic inverter according to claim 8 or 9, characterized in that, The photovoltaic inverter also includes a first fan and a second fan. The first fan is fixed to the first housing, and the arrangement direction of the first fan and the plurality of first fins is perpendicular to the arrangement direction of the first housing and the second housing. The second fan is fixed to the second housing and is located between the plurality of second fins and the plurality of first fins.

11. The photovoltaic inverter according to any one of claims 2-10, characterized in that, The power device located on the first circuit board forms at least a portion of a first power conversion circuit, and the power device located on the second circuit board forms at least a portion of a second power conversion circuit. The first power conversion circuit is used to boost or buck DC power, and the second power conversion circuit is used to convert DC power into AC power.

12. The photovoltaic inverter according to any one of claims 2-11, characterized in that, The photovoltaic inverter also includes a connecting cable, one end of which is connected to the third connecting terminal, and the other end of which is connected to the fourth connecting terminal; Alternatively, the photovoltaic inverter may further include a conductive connection bar, one end of which is connected to the third connection terminal and the other end of which is connected to the fourth connection terminal.

13. The photovoltaic inverter according to any one of claims 2-11, characterized in that, One of the third and fourth connecting terminals has a connecting block, and the other of the third and fourth connecting terminals has a groove, into which the connecting block is inserted.

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