Photovoltaic inverter and power conversion device

Abstract

The invention provides a photovoltaic inverter and a power conversion device, the photovoltaic inverter comprises a housing, a circuit board, a rotary switch, a photovoltaic connector, a signal connector and an AC connector, the housing comprises a shell and a cover plate, the shell and the cover plate define an accommodating chamber, and the shell comprises a first side plate and a second side plate which are adjacent to each other; the circuit board is arranged in the accommodating chamber; the rotary switch, the photovoltaic connector, the signal connector and the alternating current connector are connected to the circuit board through rigid metal conductors; the photovoltaic connector, the signal connector and the alternating current connector are installed on the first side plate, the signal connector is located between the photovoltaic connector and the alternating current connector, and the rotary switch is installed on the second side plate. The rotary switch, the photovoltaic connector, the signal connector, the AC connector and the like are directly connected to the circuit board, so that the occupied space can be reduced, and the integration level of the whole machine is improved. In addition, the photovoltaic connector, the signal connector and the alternating-current connector are arranged on one side, so that installation and subsequent maintenance are facilitated.

Description

Photovoltaic inverters and power conversion devices

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 5, 2023, with application number 202322409746.5 and application name “Photovoltaic Inverter and Power Conversion Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to the field of photovoltaic technology, and specifically to a photovoltaic inverter and a power conversion device. Background Art

[0003] In the photovoltaic inverter industry, the integration and simplification of power distribution components are becoming a trend. This integration and simplification helps reduce the manufacturing costs of photovoltaic inverters. Currently, power distribution components such as photovoltaic connectors, rotary switches, AC connectors, and signal connectors are often connected to circuit boards using cables. The layout of the distribution components determines the length of the cables. When multiple power and signal flows are involved, cables face problems such as insufficient bending radius, the risk of installation errors, and multiple steps, resulting in low efficiency within limited space.

[0004] Summary of the Invention

[0005] The present application provides a photovoltaic inverter and a power conversion device, which can reduce installation processes and improve connector installation efficiency.

[0006] In a first aspect, a photovoltaic inverter is provided, comprising: a housing, comprising a shell and a cover plate, the shell and the cover plate enclosing a receiving chamber, the shell comprising adjacent first and second side plates; a circuit board, disposed in the receiving chamber, the circuit board further comprising a power module, the power module being fixed to the circuit board via pins; a photovoltaic connector, disposed on the first side plate, one end of the photovoltaic connector being used to connect to a photovoltaic component; an AC connector, disposed on the first side plate, for connecting to a load or a power grid; a signal connector, disposed on the first side plate, located between the photovoltaic connector and the AC connector, for transmitting data with an external device; a rotary switch, disposed on the second side plate, the rotary switch portion being located in the receiving chamber and the rotary switch portion being located outside the receiving chamber, the rotary switch being electrically connected between the other end of the photovoltaic connector and the power module; and a controller, for controlling the rotary switch to disconnect the photovoltaic component from the power module when a fault, including a short circuit, overcurrent, or overvoltage, is detected in the photovoltaic inverter or the photovoltaic component.

[0007] The photovoltaic inverter provided in the embodiment of the present application can reduce the occupied space, reduce the installation process, improve the integration of the whole machine, reduce the cost, and improve the installation efficiency of the connector by directly connecting the rotary switch, the photovoltaic connector, the signal connector and the AC connector to the circuit board. In addition, the photovoltaic connector, the signal connector and the AC connector are arranged on one side, which is convenient for installation and subsequent operation and maintenance. In addition, when the controller in the photovoltaic inverter detects that the photovoltaic inverter itself or the photovoltaic module has a short circuit, overcurrent or overvoltage fault, it can promptly control the rotary switch to disconnect the photovoltaic module from the power module, thereby avoiding damage to the photovoltaic inverter.

[0008] In combination with the first aspect, in certain implementations of the first aspect, the first side panel and the second side panel are connected to a first side edge, and the rotary switch and the photovoltaic connector are both installed close to the first side edge.

[0009] The photovoltaic inverter provided in the embodiment of the present application eliminates the need for cables and improves the space utilization of the entire machine by placing the photovoltaic connector and the rotary switch close to each other and connecting them after being mounted on a board.

[0010] In conjunction with the first aspect, in certain implementations of the first aspect, electrical components such as an inverter power assembly, bus capacitors, and inductors are mounted on the circuit board. The inverter power assembly, bus capacitors, and inductors may be connected to the circuit board via pins.

[0011] In some embodiments, the circuit board includes an inverter circuit and a rectifier circuit, wherein the inverter circuit is used to invert direct current into alternating current, and the rectifier circuit is used to rectify alternating current into direct current.

[0012] In some embodiments, the circuit board further includes a filtering circuit and a measuring circuit. The direct current of the photovoltaic module is filtered and measured by the filtering circuit and the measuring circuit, and then output as alternating current through the inverter circuit.

[0013] In combination with the first aspect, in certain implementations of the first aspect, the photovoltaic inverter further includes an energy storage connector, which is connected to the circuit board, is mounted on the first side panel, and is located between the photovoltaic connector and the signal connector, and is also used to connect to an energy storage device.

[0014] The photovoltaic inverter provided in the embodiment of the present application, on the one hand, the energy storage connector can obtain direct current from the external energy storage device and output direct current to the inverter circuit on the circuit board, and the inverter circuit can invert the direct current into alternating current for use. On the other hand, the energy storage connector can also transmit electric energy to the external energy storage device, that is, output direct current to the external energy storage device. It should be understood that when charging the external energy storage device (such as a battery pack), the source of electric energy can be the electric energy provided by the photovoltaic module or the mains electricity. The alternating current can be rectified into direct current by the rectifier circuit on the circuit board, and the direct current can be transmitted to the external energy storage device (such as a battery pack) through the energy storage connector to charge the external energy storage device (such as a battery pack).

[0015] In combination with the first aspect, in certain implementations of the first aspect, the shell includes a bottom plate arranged opposite to the cover plate, the circuit board is located between the cover plate and the bottom plate of the shell, a heat sink is connected to the side of the bottom plate of the shell away from the circuit board, and an accommodating cavity is formed between the circuit board and the side plate of the shell and the bottom plate of the shell, and the accommodating cavity is used to accommodate the inverter power component, bus capacitor and inductor.

[0016] It should be understood that placing the electronic components in the accommodating cavity can, on the one hand, protect the electronic components, and on the other hand, effectively utilize the cavity space to avoid the cavity being too large, thereby improving space utilization and reducing costs. The electronic components are located on one side of the radiator, which is conducive to enhancing the heat dissipation effect.

[0017] It can be understood that the accommodating cavity formed between the circuit board and the side plate of the shell and the bottom plate of the shell can be called the first accommodating cavity; the accommodating cavity formed between the circuit board and the side plate of the shell and the cover plate can be called the second accommodating cavity; the height of the electronic device accommodated in the first accommodating cavity is higher than the height of the electronic device accommodated in the second accommodating cavity. For example, the height of the electronic device in the first accommodating cavity is less than or equal to 9 cm, and the height of the electronic device in the second accommodating cavity is less than or equal to 5 mm. In other words, the first accommodating cavity can accommodate electronic components with high height, large volume and high heat dissipation requirements, such as inverter power components, bus capacitors, inductors, etc.; the second accommodating cavity can accommodate electronic components with low height, small volume and low heat dissipation requirements, such as chip capacitors, chip resistors, indicator lights, etc.

[0018] In conjunction with the first aspect, in certain implementations of the first aspect, the rotary switch is connected to the circuit board via pins, the photovoltaic connector is connected to the circuit board via rigid conductors, and the photovoltaic connector and the rotary switch are electrically connected via metal traces on the circuit board. In other words, the photovoltaic connector and the rotary switch are connected via conductors within the circuit board, eliminating the need for cables. This saves space and improves space utilization.

[0019] In combination with the first aspect, in certain implementations of the first aspect, the photovoltaic connector includes multiple positive connectors and multiple negative connectors, the multiple positive connectors include multiple positive terminals, the multiple negative connectors include multiple negative terminals, the rotary switch is a multi-pole rotary switch, each of the positive terminals is connected to a pole of the rotary switch through a metal trace on the circuit board, and the multiple negative terminals are negatively converged and then connected to a pole on the rotary switch through the metal trace on the circuit board.

[0020] Each pole of the multi-pole rotary switch includes two pins (denoted as a first pin and a second pin), the first pin can be connected to the positive terminal or the negative terminal, and the second pin can be connected to the power module on the circuit board. Specifically, the second pin can be connected to the bus capacitor through the metal traces of the circuit board, and the bus capacitor is connected to the inverter power component through the metal traces of the circuit board. In this implementation, connection refers to electrical connection, which can be directly fixedly connected or indirectly fixedly connected from a structural point of view. There are multiple metal traces on the circuit board, where the metal traces can also be called wires, which can be copper wires, used to connect devices on the circuit board.

[0021] Exemplarily, the photovoltaic connector may include three positive connectors and three negative connectors, the three positive connectors including three positive terminals, the three negative connectors including three negative terminals, and the rotary switch may be a four-pole rotary switch (i.e., the rotary switch includes four poles). The three positive terminals are respectively connected to the first pins of the three poles of the four-pole rotary switch via metal traces on the circuit board. The direct current input from the three negative terminals can be negatively converged to form one direct current path, which is then connected to the first pin of one pole of the four-pole rotary switch via the metal traces on the circuit board.

[0022] In this embodiment, the photovoltaic connector and the pins of the rotary switch, the pins and the bus capacitor, and the bus capacitor and the inverter power component are connected by metal wiring, which reduces or avoids the use of cables and reduces installation difficulty.

[0023] In combination with the first aspect, in certain implementations of the first aspect, the part of the rotary switch located in the accommodating chamber is fixedly connected to the circuit board through a pin, and the rotary switch is located in the accommodating chamber, and the rotary switch is connected to the power module through a metal trace on the circuit board.

[0024] Exemplarily, the second pin on the rotary switch is connected to the power module via a metal trace on the circuit board. Specifically, the second pin on the rotary switch can be connected to the bus capacitor via the metal trace on the circuit board, and the bus capacitor is connected to the inverter power component via the metal trace on the circuit board.

[0025] In conjunction with the first aspect, in certain implementations of the first aspect, the photovoltaic inverter further includes an intelligent communication stick connected to the circuit board, mounted on the first side panel and located between the signal connector and the bottom panel of the housing. This allows full utilization of the space on the side panel of the housing, resulting in a more compact layout.

[0026] It should be understood that the smart communication stick is used to achieve communication with the smart management system (cloud), that is, it can upload data to the smart management system and receive information issued by the smart management system.

[0027] In some embodiments, the smart communication stick is connected to the circuit board via a cable, one end of the cable is connected to the circuit board, and the other end of the cable is provided with a USB interface, the USB interface is mounted on the housing, and the smart communication stick is inserted into the USB interface.

[0028] In combination with the first aspect, in some implementations of the first aspect, the photovoltaic inverter further includes an antenna, which is connected to the circuit board and is mounted on the first side panel and located between the signal connector and the AC connector.

[0029] It should be understood that the antenna is an external antenna of the built-in WLAN, which is used for near-end application access maintenance and can be used to increase signal strength and expand coverage.

[0030] In a second aspect, a power conversion device is provided, which includes: a shell, including a shell and a cover plate, the shell and the cover plate enclosing a receiving chamber, the shell including adjacent first and second side plates; a circuit board, arranged in the receiving chamber, the circuit board also including a power module, the power module being fixed to the circuit board by pins; a DC connector, arranged on the first side plate, one end of the DC connector being used to connect to a photovoltaic component; an AC connector, arranged on the first side plate, being used to connect to a load or a power grid; a signal connector, arranged on the first side plate, located between the DC connector and the AC connector, and being used to transmit data with an external device; a rotary switch, arranged on the second side plate, the rotary switch portion being located in the receiving chamber, the rotary switch portion being located outside the receiving chamber, the rotary switch being electrically connected between the other end of the DC connector and the power module; a controller, being used to control the rotary switch to disconnect the photovoltaic component from the power module when a fault including a short circuit, overcurrent or overvoltage occurs in the photovoltaic inverter or the photovoltaic component.

[0031] In combination with the second aspect, in certain implementations of the second aspect, the first side panel and the second side panel are connected to a first side edge, and the rotary switch and the DC connector are both installed close to the first side edge.

[0032] In conjunction with the second aspect, in certain implementations of the second aspect, electrical components such as an inverter power assembly, bus capacitors, and inductors are mounted on the circuit board. The inverter power assembly, bus capacitors, and inductors can be connected to the circuit board via pins.

[0033] In combination with the second aspect, in certain implementations of the second aspect, the power conversion device further includes an energy storage connector, which is connected to the circuit board, the energy storage connector is mounted on the first side panel and is located between the DC connector and the signal connector, and the energy storage connector is also used to connect to the energy storage device.

[0034] In combination with the second aspect, in certain implementations of the second aspect, the shell includes a bottom plate arranged opposite to the cover plate, the circuit board is located between the cover plate and the bottom plate of the shell, a heat sink is connected to the side of the bottom plate of the shell away from the circuit board, and an accommodating cavity is formed between the circuit board and the side plate of the shell and the bottom plate of the shell, and the accommodating cavity is used to accommodate the inverter power component, bus capacitor and inductor.

[0035] In combination with the second aspect, in certain implementations of the second aspect, the part of the rotary switch located in the accommodating chamber is fixedly connected to the circuit board through a pin, and the rotary switch is located in the accommodating chamber, and the rotary switch is connected to the power module through a metal trace on the circuit board.

[0036] In combination with the second aspect, in certain implementations of the second aspect, the rotary switch is connected to the circuit board via a pin, the DC connector is connected to the circuit board via a rigid conductor, and the DC connector and the rotary switch are electrically connected via metal traces on the circuit board.

[0037] In conjunction with the second aspect, in certain implementations of the second aspect, the DC connector includes a plurality of positive connectors and a plurality of negative connectors, the plurality of positive connectors include a plurality of positive terminals, the plurality of negative connectors include a plurality of negative terminals, and the rotary switch is a multi-pole rotary switch.

[0038] Each of the positive terminals is connected to a pole of the rotary switch through a metal trace on the circuit board, and the multiple negative terminals are negatively converged and then connected to a pole on the rotary switch through the metal trace on the circuit board.

[0039] In combination with the second aspect, in certain implementations of the second aspect, the power conversion device further includes an intelligent communication stick, which is connected to the circuit board and is mounted on the first side panel and located between the signal connector and the bottom plate of the housing.

[0040] In combination with the second aspect, in certain implementations of the second aspect, the power conversion device further includes an antenna, which is connected to the circuit board, and is mounted on the first side panel and located between the signal connector and the AC connector. The antenna is an external antenna of the built-in WLAN, which is used for proximal application access maintenance and can be used to increase signal strength and expand coverage.

[0041] The technical effects of the second aspect mentioned above can be referred to the corresponding description in the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] FIG1 is a schematic diagram of a photovoltaic power generation scenario provided in an embodiment of the present application.

[0043] FIG2 is a schematic diagram of the three-dimensional structure of a photovoltaic inverter provided in an embodiment of the present application.

[0044] FIG3 is a schematic top view of a photovoltaic inverter provided in an embodiment of the present application.

[0045] FIG4 is a schematic structural diagram of some components of a photovoltaic inverter provided in an embodiment of the present application.

[0046] FIG5 is a side view schematic diagram of a photovoltaic inverter provided in an embodiment of the present application.

[0047] FIG6 is a schematic diagram of a circuit structure of a photovoltaic inverter provided in an embodiment of the present application. DETAILED DESCRIPTION

[0048] The technical solution in this application will be described below with reference to the accompanying drawings.

[0049] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in this article is merely a way to describe the association relationship of associated objects, indicating that three relationships can exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0050] In the embodiments of the present application, prefixes such as "first" and "second" are used only to distinguish different description objects and have no limiting effect on the position, order, priority, quantity or content of the described objects. The use of prefixes such as ordinal numbers to distinguish description objects in the embodiments of the present application does not constitute a restriction on the described objects. For the statement of the described objects, please refer to the description in the context of the claims or embodiments, and the use of such prefixes should not constitute an unnecessary restriction. In addition, in the description of this embodiment, unless otherwise specified, the meaning of "plurality" is two or more.

[0051] The terms "up", "down", "left", "right", "front", "back", "top", "bottom", "inside", "outside", etc. in the embodiments of the present application indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present application.

[0052] References to "in some embodiments" and the like in this specification mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in some embodiments" and the like appearing in different places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0053] The “perpendicular” mentioned in this application is not strictly perpendicular, but within the allowable error range. The “parallel” is not strictly parallel, but within the allowable error range.

[0054] In the embodiments of this application, the same reference numerals represent the same component or part. In the embodiments of this application, for multiple identical parts, only one of the parts may be labeled with a reference numeral in the drawings as an example. The same reference numerals apply to other identical parts or components. In addition, the sizes and dimensions of the parts shown in the drawings are for illustrative purposes only.

[0055] The photovoltaic power generation scenario provided by the embodiment of the present application is first described in detail below with reference to FIG1 .

[0056] Figure 1 is a schematic diagram of a photovoltaic power generation scenario provided by an embodiment of the present application. As shown in Figure 1, the devices in the photovoltaic power generation system 10 include: photovoltaic modules 100, photovoltaic inverters 200, and energy storage systems 300. Optionally, the photovoltaic power generation system 10 may also include: a power grid 400 and a load 500.

[0057] Specifically, the photovoltaic inverter 200 can convert the direct current from the photovoltaic module 100 into alternating current, and transmit the alternating current to the power grid 400 or the load 500. Direct current is also called direct current, or DC for short; alternating current is also called alternating current, or AC for short; the photovoltaic inverter 200 can also be called a DC-AC converter. The photovoltaic inverter 200 can transmit the direct current from the photovoltaic module 100 to the energy storage system 300 so that the energy storage system 300 can be charged. The photovoltaic inverter 200 can convert the direct current from the energy storage system 300 into alternating current, and transmit the alternating current to the power grid 400 or the load 500.

[0058] The photovoltaic assembly 100, which may also be referred to as a photovoltaic array, includes multiple photovoltaic strings. Photovoltaic is also referred to as photovoltaic, or simply PV. A string is also referred to as a string. Each photovoltaic string includes multiple photovoltaic panels connected in series. The photovoltaic panels are used to convert light energy into electrical energy. The electrical energy generated by the photovoltaic panels is direct current. The voltage across the photovoltaic string is equal to the sum of the voltages generated by the multiple photovoltaic panels. The output power of the photovoltaic assembly 100 can represent the electrical energy output per unit time by the photovoltaic assembly.

[0059] The area of ​​each photovoltaic module 100 is generally fixed. When the light intensity remains constant, the larger the angle between the light irradiating the photovoltaic module 100 and the plane on which the photovoltaic module 100 is located, that is, the smaller the angle of incidence of the light irradiating the photovoltaic module 100, the more power the photovoltaic module 100 outputs. When the light irradiates the photovoltaic module 100 perpendicularly, that is, the angle between the light and the plane on which the photovoltaic module 100 is located is 90°, reaching its maximum value, the photovoltaic module 100 outputs maximum power.

[0060] It is understood that when the photovoltaic power generation system 10 includes a photovoltaic module 100, a photovoltaic inverter 200, and an energy storage system 300, the photovoltaic inverter 200 is primarily used to connect the photovoltaic module 100 and the energy storage system 300 to charge the energy storage system 300. When the photovoltaic power generation system 10 includes a photovoltaic module 100, a photovoltaic inverter 200, an energy storage system 300, a power grid 400, and a load 500, the photovoltaic inverter 200 can be used to connect the aforementioned devices. For example, the photovoltaic inverter 200 connects the photovoltaic module 100 to the energy storage system 300; the photovoltaic inverter 200 connects the photovoltaic module 100 to the power grid 400; the photovoltaic inverter 200 connects the photovoltaic module 100 to the load 500; the photovoltaic inverter 200 connects the load 500 to the energy storage system 300, and so on.

[0061] The energy storage system 300 in the photovoltaic power generation system 10 is capable of storing and releasing electrical energy. For example, the energy storage system 300 can store DC power from the photovoltaic modules 100 and can supply power to the power grid 400 or the load 500 via the photovoltaic inverter 200. Therefore, the energy storage system 300 has a wide range of application scenarios, including but not limited to household applications, industrial green power applications, and smart photovoltaic power station applications.

[0062] As can be seen from the above description, the photovoltaic inverter 200 is a converter that can convert direct current into alternating current. Specifically, the photovoltaic inverter 200 may include two DC ports (e.g., DC port 1 and DC port 2) and one AC port. The two DC ports are respectively used to connect the photovoltaic module 100 and the energy storage system 300. For example, DC port 1 is used to connect the photovoltaic module 100, and DC port 2 is used to connect the energy storage system 300. The AC port can be used to output AC power, and the output AC power can be distributed through a distribution box, such as to the power grid 400 and the load 500.

[0063] The photovoltaic assembly 100 can feed power to the grid 400 and supply power to the load 500 via the DC port. The energy storage system 300 can supply power to the load 500 via the DC port. The grid 400 can supply power to the load 500 via the AC port. In other words, the photovoltaic inverter 300 serves as the connection hub between the load 500 and the energy module (which can include the photovoltaic assembly 100, the energy storage system 300, and the grid 400).

[0064] The structure of the photovoltaic inverter 200 provided in the embodiment of the present application will be described in detail below with reference to FIG. 2 to FIG. 5 .

[0065] Figure 2 is a schematic diagram of the three-dimensional structure of a photovoltaic inverter 200 provided in an embodiment of the present application. Figure 3 is a schematic diagram of a top view of a photovoltaic inverter 200 provided in an embodiment of the present application. Figure 4 is a schematic diagram of the structure of some components of a photovoltaic inverter 200 provided in an embodiment of the present application. Figure 5 is a schematic diagram of a side view of a photovoltaic inverter 200 provided in an embodiment of the present application.

[0066] As shown in Figures 2 and 3, the photovoltaic inverter 200 includes a housing, a circuit board 220 and a distribution device. The housing can protect the circuit board 220 and the distribution device. The circuit board 220 obtains direct current from the photovoltaic module 100 through the distribution device and inverts the direct current into alternating current for output. The signal flow interacts between the circuit board 220 and the signal transceiver.

[0067] In some embodiments, as shown in FIG3 , the photovoltaic inverter 200 includes a rotary switch 230 , a PV connector 240 , a signal connector 250 , and an AC connector 260 . That is, the power distribution device includes the rotary switch 230 , the PV connector 240 , the signal connector 250 , and the AC connector 260 .

[0068] The PV connector 240 is used to connect the photovoltaic component 100. A power module is provided on the circuit board 220. The rotary switch 230 is used to control the conduction or shutdown between the photovoltaic component 100 and the power module on the circuit board 220. The signal connector 250 is used to transmit signals with external devices (such as energy storage devices, electric meters, other photovoltaic inverters, etc.). The AC connector 260 is used to connect the load 500 or the power grid 400. The direct current input by the photovoltaic component 100 flows through the photovoltaic connector 240 and the rotary switch 230 and then is transmitted to the power module of the circuit board 220. The power module can convert direct current into alternating current and transmit the alternating current to the power grid 400 or the load 500.

[0069] The rotary switch 230 can be directly connected to the circuit board 220 using pins; the PV connector 240 and the circuit board 220 can be connected through a rigid conductor; the PV connector 240 and the rotary switch 230 are connected without cables, and the electrical connection is achieved through the metal traces on the circuit board 220; the signal connector 250 is directly plugged into the circuit board 220 without the need for cable conversion; the AC connector 260 is directly connected and coupled to the circuit board 220 through the upper board conductor.

[0070] It should be understood that the rotary switch 230 is electrically connected to the circuit board 220 via pins, the photovoltaic connector 240 is electrically connected to the circuit board 220 via a rigid conductor, and the photovoltaic connector 240 and the rotary switch 230 are electrically connected via metal traces on the circuit board 220. In other words, the PV connector 240 and the rotary switch 230 are connected without cables, which can save space and improve space utilization.

[0071] The photovoltaic inverter 200 includes a housing, a circuit board 220, a rotary switch 230, a photovoltaic connector 240, a signal connector 250, an AC connector 260, and a controller. The housing includes a shell 210 and a cover plate, and the shell 210 and the cover plate enclose a receiving chamber. The shell 210 includes a first side plate and a second side plate adjacent to each other. The circuit board 220 is disposed in the receiving chamber. The circuit board 220 also includes a power module, which is fixed to the circuit board 220 via pins. The photovoltaic connector 240 is disposed on the first side plate, and one end of the photovoltaic connector 240 is used to connect to the photovoltaic module 100. The AC connector 260 is disposed on the first side plate for connecting to the load 500 or the grid 400. The signal connector 250 is disposed on the first side plate, and Located between the photovoltaic connector 240 and the AC connector 260, it is used for data transmission with external devices; the rotary switch 230 is arranged on the second side panel, the rotary switch 230 is partially located in the receiving chamber, and the rotary switch 230 is partially located outside the receiving chamber, and the rotary switch 230 is electrically connected between the other end of the photovoltaic connector 240 and the power module; the controller is used to control the rotary switch 230 to disconnect the photovoltaic module 100 from the power module when it detects a fault including short circuit, overcurrent or overvoltage in the photovoltaic inverter 200 or the photovoltaic component 100.

[0072] It should be understood that when the controller detects a short circuit, overcurrent, or overvoltage fault in the power device inside the photovoltaic inverter 200 or the photovoltaic module 100, the controller can control the rotary switch 230 to disconnect the photovoltaic module 100 from the power module.

[0073] The present application can reduce the occupied space, reduce the installation process, improve the integration of the whole machine, reduce the cost, and improve the installation efficiency of the connector by directly connecting the rotary switch 230, the photovoltaic connector 240, the signal connector 250 and the AC connector 260 to the circuit board 220. In addition, the photovoltaic connector 240, the signal connector 250 and the AC connector 260 are arranged on one side, which is convenient for installation and subsequent operation and maintenance. In addition, when the controller in the photovoltaic inverter 200 detects that the photovoltaic inverter 200 itself or the photovoltaic module 100 has a short circuit, overcurrent or overvoltage fault, it can promptly control the rotary switch 230 to disconnect the photovoltaic module 100 from the power module, thereby avoiding damage to the photovoltaic inverter 200.

[0074] In some embodiments, the edge where the first side panel connects to the second side panel can be referred to as the first side, and the rotary switch 230 and the PV connector 240 are both mounted close to the first side. The PV connector 240 and the rotary switch 230 are positioned close together and connected after mounting, eliminating cables and improving overall space utilization.

[0075] In some embodiments, as shown in Figures 4 and 5, the photovoltaic connector 240 includes multiple positive connectors 241 and multiple negative connectors 242. The multiple positive connectors 241 include multiple positive terminals 2411, and the multiple negative connectors 242 include multiple negative terminals 2421. The rotary switch 230 is a multi-pole rotary switch. Each positive terminal 2411 is connected to a pole of the rotary switch 230 via a metal trace 221 on the circuit board 220. The multiple negative terminals 2421 are connected to a pole of the rotary switch 230 after negative polarity convergence via the metal trace 221 on the circuit board 220. It should be understood that the multiple poles of the rotary switch 230 can be closed or opened by twisting the rotary switch 230. In other words, the rotary switch 230 can be used to control the conduction or disconnection between the photovoltaic module 100 and the power module on the circuit board 220.

[0076] Each pole of the multi-pole rotary switch 230 includes two pins (denoted as a first pin 231 and a second pin 232). The first pin 231 can be connected to the positive terminal 2411 or the negative terminal 2421, and the second pin 232 can be connected to the power module on the circuit board 220. Specifically, the second pin 232 can be connected to the bus capacitor 222 via the metal trace 221, and the bus capacitor 222 is connected to the inverter power component 223 via the metal trace 221. In this embodiment, connection refers to electrical connection, which can be directly fixedly connected or indirectly fixedly connected from a structural point of view. There are multiple metal traces 221 on the circuit board 220, wherein the metal traces 221 can also be called wires, which can be copper wires, used to connect devices on the circuit board 220.

[0077] Exemplarily, the photovoltaic connector 240 may include three positive connectors 241 and three negative connectors 242. The three positive connectors 241 include three positive terminals 2411, and the three negative connectors 242 include three negative terminals 2421. Each connector includes one terminal. The rotary switch 230 may be a four-pole rotary switch (i.e., the rotary switch 230 includes four poles). The three positive terminals 2411 are respectively connected to the first pins 231 of the three poles of the four-pole rotary switch 230 via the metal traces 221. The direct current input from the three negative terminals 2421 can be negatively converged. After being converged into one direct current path, it is then connected to the first pin 231 of one pole of the four-pole rotary switch 230 via the metal traces 221 on the circuit board 220.

[0078] In this embodiment, the photovoltaic connector 240 and the pins of the rotary switch 230, the pins and the bus capacitor 222, and the bus capacitor 222 and the inverter power component 223 are connected by metal traces 221, reducing or avoiding the use of cables and reducing installation difficulty.

[0079] It should be noted that the position shown by 221 in Figure 4 is only used to identify that there is a metal trace 221 on the circuit board 220, and does not represent the actual position of the metal trace 221. It should be understood that in this application, the metal trace 221 of the circuit board 220 can be wired according to the functional devices in the photovoltaic inverter 200 to realize the function of the photovoltaic inverter 200.

[0080] As shown in Figure 5, the circuit board 220 and the upper plate bracket 300 are located inside the housing. The positive connector 241 and the negative connector 242 are electrically connected to the circuit board 220 via the upper plate bracket 300. The upper plate bracket 300 and the circuit board 220 can be connected via screws 400. The photovoltaic connector 240 (including the positive connector 241 and the negative connector 242) can be electrically connected to the circuit board 220 via the upper plate bracket 300, eliminating the need for cables, thereby reducing installation steps and improving connection reliability.

[0081] The part of the rotary switch 230 located in the accommodating chamber is fixedly connected to the circuit board 220 through pins, and the rotary switch 230 is located in the accommodating chamber (i.e., the first accommodating chamber described below), and the rotary switch 230 is connected to the power module through the metal trace 221 on the circuit board 220.

[0082] Exemplarily, the second pin 232 on the rotary switch 230 is connected to the power module via a metal trace 221 on the circuit board 220. Specifically, the second pin 232 on the rotary switch 220 can be connected to the bus capacitor 222 via the metal trace 221 on the circuit board 220, and the bus capacitor 222 can be connected to the inverter power component 223 via the metal trace 221 on the circuit board 220.

[0083] In some embodiments, the circuit board 220 includes an inverter circuit, which is used to invert the direct current of the photovoltaic assembly 100 and output it as alternating current.

[0084] In some embodiments, the circuit board 220 further includes a rectifier circuit, which is configured to rectify alternating current into direct current.

[0085] In some embodiments, the circuit board 220 further includes a filter circuit and a measurement circuit. The direct current of the photovoltaic assembly 100 is filtered and measured by the filter circuit and the measurement circuit, and then output as alternating current through an inverter circuit.

[0086] The circuit board 220 may be a printed circuit board (PCB), which supports electronic components and serves as a carrier for electrical connections between them. The PCB has the function of supporting and interconnecting circuit components. The electronic components include, but are not limited to, capacitors, inductors, resistors, processors, memory, antennas, and the like. Generally, a PCB without soldered electronic components is referred to as a PCB. A PCB with soldered electronic components is referred to as a printed circuit board assembly (PCBA).

[0087] The electronic components carried by the printed circuit board can form multiple functional modules to achieve corresponding functions, such as an inverter circuit for converting direct current into alternating current, and a rectifier circuit for converting alternating current into direct current. The shape of the printed circuit board can be designed accordingly based on the shape of the electronic device and the location and shape of the functional modules to be arranged within the electronic device.

[0088] In some embodiments, electrical components such as an inverter power component 223, a bus capacitor 222, and an inductor are mounted on the circuit board 220. The inverter power component 223, the bus capacitor 222, and the inductor can be connected to the circuit board 220 via pins.

[0089] In some embodiments, the shell 210 includes a bottom plate arranged opposite to the cover plate, the circuit board 220 is located between the cover plate and the bottom plate of the shell 210, a heat sink is connected to the side of the bottom plate of the shell 210 away from the circuit board 220, and a accommodating cavity is formed between the circuit board 220 and the side plate of the shell 210 and the bottom plate of the shell 210, the accommodating cavity is used to accommodate electronic components such as the inverter power component 223, the bus capacitor 222 and the inductor, and the accommodating cavity can also be used to accommodate the upper plate bracket 300 and the rotary switch 230.

[0090] It should be understood that placing the electronic components in the accommodating cavity can, on the one hand, protect the electronic components, and on the other hand, effectively utilize the cavity space to avoid the cavity being too large, thereby improving space utilization and reducing costs. The electronic components are located on one side of the radiator, which is conducive to enhancing the heat dissipation effect.

[0091] It can be understood that the accommodating cavity formed between the circuit board 220 and the side panels of the shell 210 and the bottom panel of the shell 210 can be referred to as a first accommodating cavity; the accommodating cavity formed between the circuit board 220 and the side panels of the shell 210 and the cover plate can be referred to as a second accommodating cavity; the height of the electronic device accommodated in the first accommodating cavity is higher than the height of the electronic device accommodated in the second accommodating cavity, for example, the height of the electronic device in the first accommodating cavity is less than or equal to 9 cm, and the height of the electronic device in the second accommodating cavity is less than or equal to 5 mm. In other words, the first accommodating cavity can accommodate electronic components with high height, large volume, and high heat dissipation requirements, such as inverter power components, bus capacitors, inductors, etc.; the second accommodating cavity can accommodate electronic components with low height, small volume, and low heat dissipation requirements, such as chip capacitors, chip resistors, indicator lights, etc.

[0092] In one example, the inverter power component 223 in the first housing cavity is used to convert direct current into alternating current. In one example, the bus capacitor 222 in the first housing cavity serves to store and smooth the direct current voltage. In one example, the purpose of the inductor in the first housing cavity includes at least one of filtering, direct current conversion, and power conversion. In one example, the inductor in the first housing cavity includes at least one of a filter inductor, an inductor in a direct current conversion component, and an inductor in an inverter power component. In one example, the chip resistor in the second housing cavity can be used to limit the current in the circuit and resist interference and noise in the circuit, and the chip capacitor in the second housing cavity can be used to store charge.

[0093] In some embodiments, the photovoltaic inverter 200 further includes an antenna 280 , which is connected to the circuit board 220 . That is, the power distribution device further includes the antenna 280 , which is mounted on the first side panel of the housing 210 and located between the signal connector 250 and the AC connector 260 .

[0094] The antenna 280 is an external antenna of the built-in WLAN, which is used for near-end application (APP) access maintenance and can be used to increase signal strength and expand coverage.

[0095] In some embodiments, the photovoltaic inverter 200 further includes an intelligent signal stick 270, which is connected to the circuit board 220. In other words, the power distribution device further includes the intelligent signal stick 270, which is mounted on the first side panel and located below the signal connector 250, that is, between the signal connector 250 and the bottom plate of the housing 210. The intelligent signal stick 270 is used to communicate with an intelligent management system (cloud), that is, it can upload data to the intelligent management system and receive information from the intelligent management system.

[0096] In one example, the smart signal stick 270 is connected to the circuit board 220 via a cable. It can be understood that one end of the cable is connected to the circuit board 220, and the other end of the cable is provided with a universal serial bus (USB) interface. The USB interface is installed on the housing 210, and the smart communication stick 270 can be inserted into the USB interface.

[0097] In some embodiments, as shown in Figures 2 and 3, the photovoltaic inverter 200 further includes an energy storage connector 290. That is, the power distribution device further includes the energy storage connector 290, which can also be connected to the circuit board 220. The energy storage connector 290 is mounted on the first side panel of the housing 210 and is located between the photovoltaic connector 240 and the signal connector 250. The energy storage connector 290 is used to receive direct current (DC) power and output it to the inverter circuit. The energy storage connector 290 is also used to connect to an energy storage device.

[0098] It should be understood that when the connector is connected to an energy storage device (such as a battery pack), it can be called an energy storage connector; when the connector is connected to a photovoltaic module, it can be called a photovoltaic connector. The external structure of the energy storage connector and the photovoltaic connector may be similar, and the main difference between the two is the external device they connect to. It is understood that one end of the energy storage connector 290 can be connected to the circuit board 220, and the other end of the energy storage connector 290 can be connected to the energy storage system 300 (i.e., the external energy storage device).

[0099] It should be noted that the photovoltaic connector 240 is connected to the photovoltaic assembly 100. The photovoltaic assembly 100 mainly converts solar energy into electrical energy and then transmits it to the photovoltaic inverter 200 through the photovoltaic connector 240. However, it may not be able to provide electrical energy at night or when weather conditions are poor. Therefore, the photovoltaic inverter 200 can be connected to an external energy storage device (such as a battery pack) through the energy storage connector 290, so that it can also provide electrical energy at night or when weather conditions are poor.

[0100] On the one hand, the energy storage connector 290 can obtain direct current from an external energy storage device and output direct current to the inverter circuit on the circuit board 220, and the inverter circuit can invert the direct current into alternating current for use. On the other hand, the energy storage connector 290 can also transmit electrical energy to the external energy storage device, that is, output direct current to the external energy storage device. It should be understood that when charging an external energy storage device (such as a battery pack), the source of electrical energy can be the electrical energy provided by the photovoltaic assembly 100 or the mains electricity. The alternating current can be rectified into direct current through the rectifier circuit on the circuit board 220, and the direct current can be transmitted to the external energy storage device (such as a battery pack) through the energy storage connector 290 to charge the external energy storage device (such as a battery pack).

[0101] The above describes in detail the specific layout of the power distribution components of the photovoltaic inverter 200 provided in the embodiment of the present application in conjunction with Figures 2 to 5. The circuit structure of the photovoltaic inverter 200 provided in the embodiment of the present application will be described below in conjunction with Figure 6.

[0102] FIG6 is a schematic diagram of a circuit structure of a photovoltaic inverter provided in an embodiment of the present application.

[0103] As shown in FIG6 , in the photovoltaic inverter 200, the PV connector 240 may include a plurality of PV+ terminals (i.e., positive terminals 2411) and a plurality of PV- terminals (i.e., negative terminals 2421), wherein the PV+ terminal is connected to the positive terminal of the photovoltaic module 100, and the PV- terminal is connected to the negative terminal of the photovoltaic module 100. Within the PV module 100, current flows from the negative terminal of the PV module 100 to the positive terminal of the PV module 100. The positive and negative terminals of the PV module 100 are connected to the circuit board 220 in the photovoltaic inverter 200 via the PV connector 140.

[0104] The rotary switch 230 is used to control the conduction between the photovoltaic module 100 and the circuit board 220, thereby interrupting the current and isolating the circuit board. The circuit board 220 may include a voltage conversion circuit (i.e., a DC-DC circuit) and an inverter circuit (i.e., a DC-AC circuit). The DC-DC circuit is used to convert direct current (DC) of one voltage value to direct current (DC) of another voltage value, and the DC-AC circuit is used to invert DC to alternating current (AC), i.e., perform DC-AC conversion.

[0105] It should be understood that after the direct current input by the photovoltaic component 100 is transmitted to the circuit board 220, it can be transformed by the DC-DC circuit, and then converted into alternating current by the DC-AC circuit. The converted alternating current can be transmitted to the load 500 or the power grid 400 through the AC connector 260.

[0106] In some embodiments, the circuit board 220 may further include a control circuit configured to receive signals transmitted by the signal connector 250 and transmit the received signals to various devices (e.g., AC relays) to achieve interaction. It should be understood that the signal connector 250 can exchange signals with the control circuit on the circuit board 220. For example, after the signal connector 250 communicates with an external device (e.g., an energy storage device, an electric meter, another photovoltaic inverter, etc.), it feeds the information back to the control circuit.

[0107] In some embodiments, the PV connector 240 includes multiple PV+ terminals and multiple PV- terminals. The multiple PV+ terminals are connected to the circuit board 220 through cables, and the multiple PV- terminals can also be connected to the circuit board 220 through cables.

[0108] In other embodiments, the PV connector 240 includes multiple PV+ terminals and multiple PV- terminals, at least two of the multiple PV+ terminals are combined into one and connected to the circuit board 220 through a cable, or at least two of the multiple PV- terminals are combined into one and connected to the circuit board 220 through a cable.

[0109] Exemplarily, as shown in FIG6 , the PV connector 240 includes three PV+ terminals and three PV- terminals, wherein the three PV+ terminals can be connected to the circuit board 220 through cables respectively, and the three PV- terminals are combined into one and connected to the circuit board 220 through cables.

[0110] In some embodiments, as shown in FIG6 , the photovoltaic inverter 200 may be a single-phase inverter. The photovoltaic inverter 200 converts direct current into alternating current output. Single-phase inversion converts the output AC voltage into a single phase, such as AC 220V or 230V. The interface of the single-phase inverter has three jacks, marked "N," "L," and "PE." L represents the live wire (marked with the letter L), which is generally red or brown; N represents the neutral wire (marked with the letter N), which is generally blue or white; and PE represents the earth wire (marked with the letter E), which is generally yellow and green.

[0111] In other embodiments, the photovoltaic inverter 200 can be a three-phase inverter. Three-phase inversion converts the output AC voltage into three phases, such as AC 380V or 400V. Three-phase electricity is composed of three AC potentials with the same frequency, equal amplitude, and phase difference of 120°. The interface of the three-phase inverter has five holes, namely A, B, C, N, and PE. Phase A is yellow, phase B is green, and phase C is red. N represents the neutral wire and is a blue or white wire; PE represents the ground wire and is a yellow and green wire.

[0112] It should be noted that, in some embodiments, the photovoltaic inverter 200 includes the energy storage connector 290, and the inverter circuit on the circuit board 220 can be replaced with a power storage converter (power control system, PCS) circuit, that is, the PCS circuit can convert the input direct current into alternating current, and can also convert the input alternating current into direct current.

[0113] In some embodiments, the energy storage connector 290 can output direct current (DC) to an external energy storage device for charging. This DC power can be derived from solar energy captured by the photovoltaic module 100 on the PV side, or from AC power on the AC side. In some embodiments, the energy storage connector 290 can also input DC power to the PCS circuit, which can convert the input DC power into AC power for output to the user load 500 or the grid 400.

[0114] In addition, an embodiment of the present application also provides a power conversion device, which has the same structure as the above-mentioned photovoltaic inverter 200. The photovoltaic connector 240 in the photovoltaic inverter 200 can also be called a DC connector. The specific structure of the power conversion device can refer to the relevant description of the above-mentioned photovoltaic inverter 200, and will not be repeated here.

[0115] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A photovoltaic inverter, characterized in that: include: A housing, comprising a shell (210) and a cover plate, wherein the shell (210) and the cover plate enclose a receiving chamber, and the shell (210) comprises a first side plate and a second side plate adjacent to each other; A circuit board (220) is arranged in the receiving chamber, the circuit board (220) further comprising a power module, the power module being fixed to the circuit board (220) via pins; A photovoltaic connector (240), arranged on the first side plate, one end of the photovoltaic connector (240) being used for connecting a photovoltaic module; An AC connector (260), arranged on the first side plate, for connecting to a load or a power grid; A signal connector (250), arranged on the first side plate, located between the photovoltaic connector (240) and the AC connector (260), and used for data transmission with an external device; A rotary switch (230) is arranged on the second side plate, a portion of the rotary switch (230) is located inside the receiving chamber, a portion of the rotary switch (230) is located outside the receiving chamber, and the rotary switch (230) is electrically connected between the other end of the photovoltaic connector (240) and the power module; The controller is used for controlling the rotary switch (230) to disconnect the photovoltaic component from the power module when a fault including short circuit, overcurrent or overvoltage occurs in the photovoltaic inverter or the photovoltaic component.

2. The photovoltaic inverter according to claim 1, characterized in that: The housing (210) comprises a bottom plate arranged opposite to the cover plate, the circuit board (220) is located between the cover plate and the bottom plate, a heat sink is installed on a side of the bottom plate away from the circuit board (220), and a receiving cavity is formed between the circuit board (220) and the side plate of the housing (210) and the bottom plate of the housing (210), and the receiving cavity is used to receive an inverter power component, a busbar capacitor and an inductor.

3. The photovoltaic inverter according to claim 2, characterized in that: The portion of the rotary switch (230) located in the receiving chamber is fixedly connected to the circuit board (220) via pins, and the rotary switch (230) is located in the receiving chamber. The rotary switch (230) is connected to the power module via a metal trace (221) on the circuit board (220).

4. The photovoltaic inverter according to claim 1, characterized in that: The photovoltaic inverter further comprises an energy storage connector (290), wherein the energy storage connector (290) is connected to the circuit board (220), the energy storage connector (290) is mounted on the first side panel and is located between the photovoltaic connector (240) and the signal connector (250), and the energy storage connector (290) is also used to connect to an energy storage device.

5. The photovoltaic inverter according to claim 1, characterized in that: The first side plate and the second side plate are connected to a first side edge, and the rotary switch (230) and the photovoltaic connector (240) are both installed close to the first side edge.

6. The photovoltaic inverter according to claim 1, characterized in that: The rotary switch (230) is connected to the circuit board (220) via a pin, the photovoltaic connector (240) is connected to the circuit board (220) via a rigid conductor, and the photovoltaic connector (240) and the rotary switch (230) are electrically connected via metal traces on the circuit board (220).

7. The photovoltaic inverter according to claim 1, characterized in that: The photovoltaic connector (240) comprises a plurality of positive connectors (241) and a plurality of negative connectors (242); the plurality of positive connectors (241) comprises a plurality of positive terminals (2411); the plurality of negative connectors (242) comprises a plurality of negative terminals (2421); the rotary switch (230) is a multi-pole rotary switch; Each of the positive terminals (2411) is connected to a pole of the rotary switch (230) via a metal trace (221) on the circuit board (220), and the multiple negative terminals (2421) are connected to a pole on the rotary switch (230) via a metal trace (221) on the circuit board (220) after negative electrode convergence.

8. The photovoltaic inverter according to claim 2, characterized in that: The photovoltaic inverter further comprises an intelligent communication stick (270), the intelligent communication stick (270) being connected to the circuit board (220), the intelligent communication stick (270) being mounted on the first side panel and being located between the signal connector (250) and the bottom plate of the housing (210).

9. The photovoltaic inverter according to any one of claims 1 to 8, characterized in that: The photovoltaic inverter further comprises an antenna (280), wherein the antenna (280) is connected to the circuit board (220), and the antenna (280) is mounted on the first side panel and is located between the signal connector (250) and the AC connector (260).

10. A power conversion device, characterized in that: include: The housing comprises a shell and a cover plate, wherein the shell and the cover plate enclose a receiving chamber, and the shell comprises a first side plate and a second side plate adjacent to each other; A circuit board is disposed in the receiving chamber, the circuit board further comprising a power module, and the power module is fixed to the circuit board through pins; A DC connector, disposed on the first side plate, one end of the DC connector being used to connect a photovoltaic module; An AC connector, disposed on the first side plate, for connecting to a load or a power grid; A signal connector, disposed on the first side panel, located between the DC connector and the AC connector, and used for data transmission with an external device; A rotary switch, disposed on the second side plate, wherein a portion of the rotary switch is located inside the receiving chamber, and a portion of the rotary switch is located outside the receiving chamber, and the rotary switch is electrically connected between the other end of the DC connector and the power module; The controller is used to control the rotary switch to disconnect the photovoltaic component from the power module when a fault including short circuit, overcurrent or overvoltage occurs in the photovoltaic inverter or the photovoltaic component.

11. The power conversion device according to claim 10, characterized in that: The shell includes a bottom plate arranged opposite to the cover plate, the circuit board is located between the cover plate and the bottom plate, a heat sink is connected to the side of the bottom plate away from the circuit board, and a receiving cavity is formed between the circuit board and the side plate of the shell and the bottom plate of the shell, and the receiving cavity is used to receive the inverter power component, bus capacitor and inductor.

12. The power conversion device according to claim 11, characterized in that: The part of the rotary switch located in the receiving chamber is fixedly connected to the circuit board through pins, and the rotary switch is located in the receiving chamber. The rotary switch is connected to the power module through metal traces on the circuit board.

13. The power conversion device according to claim 10, characterized in that: The power conversion device also includes an energy storage connector, which is connected to the circuit board. The energy storage connector is installed on the first side panel and is located between the DC connector and the signal connector. The energy storage connector is also used to connect to an energy storage device.

14. The power conversion device according to claim 10, characterized in that: The first side plate and the second side plate are connected to a first side edge, and the rotary switch and the DC connector are both installed close to the first side edge.

15. The power conversion device according to claim 10, characterized in that: The rotary switch is connected to the circuit board via a pin, the DC connector is connected to the circuit board via a rigid conductor, and the DC connector and the rotary switch are electrically connected via metal traces on the circuit board.

16. The power conversion device according to claim 10, characterized in that: The DC connector includes a plurality of positive connectors and a plurality of negative connectors, the plurality of positive connectors include a plurality of positive terminals, the plurality of negative connectors include a plurality of negative terminals, and the rotary switch is a multi-pole rotary switch. Each of the positive terminals is connected to a pole of the rotary switch through a metal trace on the circuit board, and the multiple negative terminals are connected to a pole on the rotary switch through the metal trace on the circuit board after negative pole convergence.

17. The power conversion device according to claim 11, characterized in that: The power conversion device further comprises an intelligent communication stick, which is connected to the circuit board and is mounted on the first side plate and is located between the signal connector and the bottom plate of the housing.

18. The power conversion device according to any one of claims 10 to 17, characterized in that: The power conversion device further includes an antenna, which is connected to the circuit board and is mounted on the first side plate and located between the signal connector and the AC connector.

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