Power conversion device and rotary switch

Abstract

The utility model provides a power conversion device and a rotary switch. The power conversion device comprises a circuit board and a rotary switch, the rotary switch comprises an insulating shell, a plurality of wiring points are arranged on one surface of the insulating shell, a plurality of contacts are arranged on the other surface of the insulating shell, one of the wiring points and the contacts is used for being connected with a power source, and the other one is used for being connected with the circuit board. The plurality of wiring points are arranged on the first surface along a first direction, at least one protruding part extending along a second direction is arranged on one surface, each protruding part is located between two adjacent wiring points in the first direction, the second direction is perpendicular to the first direction, each protruding part is provided with a groove extending along a third direction, and the second direction is perpendicular to the first direction. The third direction is perpendicular to one surface, the groove is used for inserting an insulating plate, and the size of the insulating plate in the third direction is larger than that of the groove in the third direction, so that the insulating structure of the rotary switch can be adjusted according to different insulating requirements.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a power conversion device and a rotary switch. Background Art

[0002] In a photovoltaic power generation system, a photovoltaic inverter can convert the direct current input by the photovoltaic module into alternating current. Users can control the on and off of the photovoltaic module input through a rotary switch. The output terminals of existing multi-layer rotary switches are mostly connected by means of screw-pressed wire frames through terminals or bare wires. In order to meet the insulation requirements of cables at high voltages, an insulating structure is usually added to the insulating shell to increase the inter-layer creepage distance. However, the insulation requirements of the positive and negative poles formed by different wiring between different layers of a multi-layer rotary switch are different, and adding a unified insulation structure may not be able to meet different insulation requirements. Utility Model Content

[0003] The present application provides a power conversion device and a rotary switch, and the insulation structure of the rotary switch can be adjusted according to different insulation requirements, thereby ensuring the electrical performance of the power conversion device is stable and safe.

[0004] In a first aspect, a power conversion device is provided, comprising: a circuit board (120), the circuit board (120) being used to set an electrical component, the electrical component being used for power conversion; a rotary switch (130), the rotary switch (130) comprising an insulating shell (1315), a surface of the insulating shell (1315) being provided with a plurality of wiring points, the plurality of wiring points being arranged along a first direction on the surface, and another surface of the insulating shell (1315) being provided with a plurality of contacts, the wiring point and one of the contacts being used to connect to a power source, the wiring point and the other of the contacts being used to connect to a power source, For connecting the circuit board (120), wherein at least one protrusion is formed on the one surface, each of the protrusions is located between two adjacent wiring points in the first direction, each of the protrusions extends along the second direction on the first surface, the second direction is perpendicular to the first direction, and each of the protrusions protrudes from the one surface in a third direction, the third direction is perpendicular to the one surface, and each of the protrusions is provided with a groove opening in the third direction, the groove is used to accommodate an insulating plate (140), and the size of the insulating plate in the third direction is larger than the size of the groove in the third direction.

[0005] It should be understood that the power conversion device may be a photovoltaic inverter, and the inverter may be an inverter including a DC-AC conversion AC-DC circuit and a DC-DC conversion DC-DC circuit, or the inverter may be an inverter including a DC-DC conversion DC-DC circuit, and the embodiments of the present application are not limited to this.

[0006] It should be understood that the power source may be a photovoltaic module, such as a solar cell module.

[0007] It should be understood that one of the wiring point and the contact is used to connect the power supply, and the other of the wiring point and the contact is used to connect the circuit board (120). It can be understood that the multiple wiring points can be used to connect the power supply and the multiple contacts are used to connect the circuit board, or the multiple wiring points are used to connect the circuit board and the multiple contacts are used to connect the power supply. The embodiments of the present application are not limited to this.

[0008] It should be understood that the dimension of the groove in the third direction can be understood as the depth of the groove, and the embodiment of the present application does not limit the specific depth of the groove. For example, the bottom of the groove can be lower than the surface of the insulating shell (1315), or the bottom of the groove can be higher than the surface of the insulating shell (1315), and the embodiment of the present application does not limit this.

[0009] It should be understood that the dimension of the insulating plate in the third direction is greater than the dimension of the groove in the third direction, which can be understood as that after the insulating plate is inserted into the groove, a portion of the insulating plate can extend out of the groove, thereby further increasing the creepage distance between two adjacent wiring points. The creepage distance is the shortest distance between two conductive parts (wiring points) measured along the one surface.

[0010] In some possible embodiments, the rotary switch can be a multi-pole switch, that is, the multiple wiring points can be used to connect the positive and negative poles of multiple power supplies. By inserting an insulating plate into the groove between the multiple wiring points with opposite polarities, the creepage distance between the two wiring points can be increased.

[0011] It should be understood that the insulating housing between two adjacent wiring points among the plurality of wiring points is provided with the protrusion, and the protrusion is provided with the groove. In other words, any two adjacent wiring points among the plurality of wiring points can be provided with a protrusion, and a groove into which the insulating plate can be inserted can be provided in the protrusion.

[0012] It should be understood that the embodiment of the present application does not limit the number of insulating plates that can be inserted into the groove provided on each protrusion. For example, the size of the first groove can be used to accommodate one insulating plate, and the size of the second groove can be used to accommodate two insulating plates, and the embodiment of the present application does not limit this.

[0013] It should be understood that the present embodiment of the invention does not limit the materials of the insulating housing and the insulating plate, and the materials of the insulating housing and the insulating plate may be the same or different, and the present embodiment of the invention does not limit this. For example, the insulating housing and the insulating plate are both made of plastic.

[0014] The rotary switch of the power conversion device provided in the embodiment of the present application has a plurality of protrusions formed on one surface of the insulating shell on which a plurality of wiring points are arranged, and a groove is arranged on the protrusion in a third direction for inserting an insulating plate. Therefore, when different insulation requirements are formed by adopting different wiring methods, the power conversion device proposed in the present application can adjust the insulation structure of the rotary switch according to different insulation requirements by inserting the insulating plate in the groove between the wiring points, thereby ensuring the electrical performance stability and safety of the power conversion device.

[0015] In combination with the first aspect, in certain implementations of the first aspect, the power conversion device further includes a housing (110), and the switch body (131) and the circuit board (120) are located in a receiving cavity surrounded by the housing (110).

[0016] In combination with the first aspect, in certain implementations of the first aspect, the two wiring points adjacent to each of the protrusions are used to connect two poles of opposite polarity in the DC power supply, or the two wiring points adjacent to each of the protrusions are used to connect two poles of opposite polarity in the circuit board (120).

[0017] Based on the above scheme, an insulating plate can be inserted into the groove only when the polarities connected to two adjacent wiring points are opposite to increase the creepage distance between the positive and negative poles, thereby ensuring the electrical performance stability and safety of the power conversion device while reducing the operational complexity when the conductivity requirements change.

[0018] In combination with the first aspect, in certain implementations of the first aspect, the circuit board (120) includes at least one maximum power point tracking (MPPT) circuit, and the input end of the at least one MPPT circuit is used to connect to the at least one access point, or the input end of the at least one MPPT circuit is used to connect to the at least one contact.

[0019] In combination with the first aspect, in certain implementations of the first aspect, the circuit board (120) includes a direct current (DC)-to-DC conversion circuit, and the input end of the DC-DC circuit is used to connect to the at least one access point, or the input end of the DC-DC circuit is used to connect to the at least one contact.

[0020] In combination with the first aspect, in certain implementations of the first aspect, the circuit board (120) includes a direct current-alternating current (AC) conversion circuit, and the input end of the DC-AC circuit is used to connect to the output end of the DC-DC circuit.

[0021] In combination with the first aspect, in some implementations of the first aspect, the number of the protrusions between two adjacent wiring points is one or more.

[0022] In a second aspect, a rotary switch is provided, comprising: an insulating shell (1315), a surface of the insulating shell (1315) being provided with a plurality of wiring points, the plurality of wiring points being arranged along a first direction on the surface, a second surface of the insulating shell (1315) being provided with a plurality of contacts, the wiring point and one of the contacts being used to connect to a power source, the wiring point and the other of the contacts being used to connect to a circuit board (120) in a power conversion device, wherein at least one protrusion is formed on the surface, each of the protrusions being located between two adjacent wiring points in the first direction, each of the protrusions extending along a second direction on the first surface, the second direction being perpendicular to the first direction, and each of the protrusions protruding from the surface in a third direction, the third direction being perpendicular to the surface, each of the protrusions being provided with a groove opening in the third direction, the groove being used to accommodate an insulating plate (140), the size of the insulating plate in the third direction being larger than the size of the groove in the third direction.

[0023] In combination with the second aspect, in certain implementations of the second aspect, the protrusion is provided on the insulating housing between two adjacent wiring points among the multiple wiring points, and the protrusion is provided with the groove.

[0024] In combination with the second aspect, in some implementations of the second aspect, the number of the protrusions between two adjacent wiring points is one or more.

[0025] For the supplement of the second aspect and the beneficial effects of each implementation method, please refer to the first aspect and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of a photovoltaic power generation system provided in an embodiment of the present application.

[0027] Figure 2 It is a schematic diagram of the structure of a power conversion device provided in an embodiment of the present application.

[0028] Figure 3 It is a schematic diagram of a circuit structure of a power conversion device provided in an embodiment of the present application.

[0029] Figure 4 It is a schematic diagram of the structure of a power conversion device provided in an embodiment of the present application.

[0030] Figure 5 It is a schematic diagram of the structure of the switch body provided in an embodiment of the present application.

[0031] Figure 6 It is a schematic diagram of an insertion method of an insulating plate provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0033] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or. For example, A / B can mean A or B. The “and / or” in this article is merely a way to describe the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0034] In the embodiments of the present application, prefixes such as "first", "second", and "third" 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 limitation 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 no unnecessary limitations should be constituted due to the use of such prefixes. In addition, in the description of this embodiment, unless otherwise specified, "multiple" means two or more.

[0035] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" in the embodiments of the present application are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present application.

[0036] References to "some embodiments" and the like described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in some embodiments" and the like appearing in different places in this specification do not necessarily all refer to the same embodiment, but rather mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "include", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized.

[0037] The "perpendicular" mentioned in this application is not perpendicular in the strict sense, but within the allowable error range. The "parallel" is not parallel in the strict sense, but within the allowable error range.

[0038] In the embodiments of the present application, the same reference numerals represent the same component or the same part. In the embodiments of the present application, for multiple identical parts, only one of the parts may be marked with a reference numeral in the drawings as an example. For other identical parts or components, the reference numerals are also applicable. In addition, the sizes and dimensions of the parts shown in the drawings are only exemplary.

[0039] Combine the following Figure 1 The photovoltaic power generation system provided in the embodiment of the present application is first described in detail.

[0040] Figure 1 Schematic diagram of a photovoltaic power generation system provided in an embodiment of the present application. Figure 1 As shown, the photovoltaic power generation system may include: a photovoltaic component 10 , a power conversion device 20 and an energy storage system 30 .

[0041] Optionally, the photovoltaic power generation system may further include: a power grid 40 and a load 50 .

[0042] Specifically, the power conversion device 20 can convert the direct current from the photovoltaic assembly 10 into alternating current, and transmit the alternating current to the power grid 40 or the load 50. The power conversion device 20 can transmit the direct current from the photovoltaic assembly 10 to the energy storage system 30 so as to charge the energy storage system 30. The power conversion device 20 can convert the direct current from the energy storage system 30 into alternating current, and transmit the alternating current to the power grid 40 or the load 50.

[0043] It can be understood that when the photovoltaic power generation system includes a photovoltaic module 10, a power conversion device 20 and an energy storage system 30, the power conversion device 20 is mainly used to connect the photovoltaic module 10 and the energy storage system 30 so as to charge the energy storage system 30. When the photovoltaic power generation system includes a photovoltaic module 10, a power conversion device 20, an energy storage system 30, a power grid 40 and a load 50, the power conversion device 20 can be used to connect the above devices. For example, the power conversion device 20 connects the photovoltaic module 10 to the energy storage system 30; the power conversion device 20 connects the photovoltaic module 10 to the power grid 40; the power conversion device 20 connects the photovoltaic module 10 to the load 50; the power conversion device 20 connects the load 50 to the energy storage system 30, etc.

[0044] The energy storage system 30 in the photovoltaic power generation system can store and release electric energy. For example, the energy storage system 30 can store DC power from the photovoltaic module 10, and the energy storage system 30 can supply power to the power grid 40 or the load 50 through the power conversion device 20. Therefore, the application scenarios of the energy storage system 30 are relatively wide, including but not limited to: household scenarios, industry green electricity scenarios, and smart photovoltaic power station scenarios.

[0045] As can be seen from the above description, the power conversion device 20 is a converter that can convert direct current into alternating current. In a photovoltaic power generation system, the power conversion device 20 can be a photovoltaic inverter. Exemplarily, the power conversion device 20 can include two DC ports (for example, DC port 1 and DC port 2) and an AC port. The two DC ports are used to connect the photovoltaic component 10 and the energy storage system 30, for example, the DC port 1 is used to connect the photovoltaic component 10, and the DC port 2 is used to connect the energy storage system 30; the AC port can be used to connect the power grid 40 or the load 50.

[0046] The photovoltaic assembly 10 can feed the grid 40 and supply power to the load 50 through the DC port 1. The energy storage system 30 can supply power to the load 50 through the DC port 2. The grid 40 can supply power to the load 50 through the AC port. In other words, the power conversion device 20 is a connection hub between the load 50 and the energy module (which may include the photovoltaic assembly 10, the energy storage system 30 and the grid 40).

[0047] In the above system, the photovoltaic module 10 can be a solar cell module (also called a PV module). A single solar cell is the smallest unit that converts light energy into electrical energy. A solar cell module is a minimum unit that is used as a battery by connecting a number of single solar cells in series and parallel according to electrical performance classification, and then packaging them together. The solar cell module can form a string in series and / or parallel, that is, the power conversion device 20 can be connected to multiple or one or more photovoltaic strings. Among them, for each photovoltaic string, under a certain light intensity and ambient temperature, the string can operate at different output voltages, that is, the output power of the string will change with the change of light intensity, ambient temperature and output voltage, but under a certain light intensity and ambient temperature, there is only one maximum power point (maximum power point, MPP). Maximum power point tracking (maximum power point track, MPPT) is to continuously adjust the working point of the string according to different external light intensity, ambient temperature and other characteristics, so that it always works at the maximum power point, even if the string always outputs the maximum power. The maximum power point voltage can refer to the output voltage of the string corresponding to the maximum power point.

[0048] Figure 2 1 is a top view of a power conversion device 100 provided in an embodiment of the present application. Figure 2 The power conversion device 100 shown may be Figure 1 The power conversion device 20 shown is an exemplary structure.

[0049] refer to Figure 2 In a photovoltaic power generation system, a power conversion device 100 includes components such as a housing 110, a circuit board 120, and a rotary switch 130. The circuit board 120 is located in a housing cavity surrounded by the housing 110, and is mainly used to realize the function of the power conversion device to convert direct current into alternating current. The rotary switch 130 mainly plays the role of switching current on and off. One end of the rotary switch 130 is used to connect a photovoltaic module (or a photovoltaic string), and the other end is connected to the circuit board 120.

[0050] In some embodiments, the power conversion device may also include a photovoltaic connector 135 and an AC connector 136. The AC connector 136 is used to transmit AC power to the power grid and / or the load. One end of the photovoltaic connector 135 is connected to the rotary switch 130, and the other end is connected to the photovoltaic module (or photovoltaic string). The photovoltaic connector 135 is used to input the DC power generated by the photovoltaic module using light energy to the rotary switch 130. The photovoltaic connector 135 may include a plurality of positive connectors and a plurality of negative connectors, and the plurality of positive connectors and the plurality of negative connectors correspond one to one. Among them, the positive connector can be connected to the positive pole of a photovoltaic module, and the negative connector corresponding to the positive connector is connected to the negative pole of the photovoltaic module.

[0051] Figure 3 It is a schematic diagram of a circuit structure of a power conversion device provided in an embodiment of the present application.

[0052] like Figure 3 As shown, at least one MPPT circuit (eg Figure 3 The MPPT circuit is used to detect the voltage and current values ​​of the photovoltaic string and track the maximum power point to ensure that the photovoltaic system outputs with higher efficiency. One end of the rotary switch 130 is electrically connected to the photovoltaic connector 135, and the other end of the rotary switch 130 is electrically connected to the corresponding MPPT circuit, thereby playing the function of controlling the photovoltaic (DC) input.

[0053] An inverter circuit (DC / AC circuit) may also be provided on the circuit board 120, and the inverter circuit is used to convert direct current into alternating current. The rotary switch 130 is located between the photovoltaic connector 135 and the DC / AC circuit, thereby controlling the current on and off between the photovoltaic connector 135 and the DC / AC circuit, that is, controlling the photovoltaic (direct current) input.

[0054] A DC / DC circuit can also be provided on the circuit board 120. The DC / DC circuit is used to convert direct current of one voltage value into direct current of another voltage value. The input end of the DC / DC circuit can be connected to the output ends of multiple MPPT circuits, and the output end of the DC / DC circuit is connected to the input end of the DC / AC circuit.

[0055] In one possible implementation scenario, the at least one MPPT circuit mentioned above may be optional, and the other end of the rotary switch may be directly connected to the input end of the DC / DC circuit; in another possible implementation scenario, the DC / DC circuit mentioned above may be optional, and the other end of the MPPT may be directly connected to the input end of the DC / AC circuit; in another possible implementation scenario, the at least one MPPT and the DC / DC circuit may both be optional, and the other end of the rotary switch may be directly connected to the input end of the DC / AC circuit.

[0056] In order to realize the functions of the power conversion device 100, other circuits may also be set on the circuit board 120, such as a rectifier circuit (AC / DC circuit) for converting alternating current into direct current, etc. The embodiment of the present application does not limit the type and number of circuits set on the circuit board 120.

[0057] In the present application, the circuit board 120 may also be referred to as a printed circuit board or a mainboard. The printed circuit board is a support for electronic components and also serves as a carrier for electrical connection of electronic components. Generally, a printed circuit board without soldered electronic components may be referred to as a PCB board. A printed circuit board with soldered electronic components may be referred to as a printed circuit board assembly (PCBA). Conductive patterns or metal traces are provided on the circuit board, and the electronic components may be electrically connected through the conductive patterns or metal traces. The electronic components carried on the circuit board may form a plurality of functional modules to realize corresponding functions, for example, an inverter circuit module is used to convert direct current into alternating current, a rectifier circuit module is used to convert alternating current into direct current, and the like.

[0058] The power conversion device and the rotary switch of the power conversion device provided in the embodiments of the present application are described below in conjunction with the accompanying drawings.

[0059] Figure 4 It is a schematic diagram of the structure of a power conversion device provided in an embodiment of the present application. Figure 5 It is a schematic diagram of the structure of the switch body provided in an embodiment of the present application.

[0060] refer to Figure 2 and Figure 4 The power conversion device 100 may include a housing 110, a circuit board 120 and a rotary switch 130. The housing 110 may include a top plate, a bottom plate and a side plate, and the top plate, the bottom plate and the side plate of the housing 110 may enclose a receiving cavity, wherein the top plate and the bottom plate of the housing 110 are arranged opposite to each other.

[0061] The circuit board 120 is located in the accommodating cavity surrounded by the shell 110, and the circuit board 120 divides the accommodating cavity surrounded by the shell 110 into a first chamber and a second chamber. The first chamber is the accommodating space surrounded by the bottom plate of the shell 110, the side plate of the shell 110 and the circuit board 120, and the second chamber is the accommodating space surrounded by the top plate of the shell 110, the side plate of the shell 110 and the circuit board 120. In addition, the distance between the circuit board 120 and the bottom plate of the shell 110 is greater than the distance between the circuit board 120 and the top plate of the shell 110, that is, the height of the first chamber is greater than the height of the second chamber.

[0062] In some embodiments, the circuit board 120 is parallel to the bottom plate and / or the top plate of the housing 110 .

[0063] In the embodiment of the present application, electrical components are installed on both sides of the circuit board 120. That is, a part of the electrical components is located in the first chamber, and this part of the electrical components is connected to the side of the circuit board 120 close to the bottom plate of the housing 110; the other part of the electrical components is located in the second chamber, and this part of the electrical components is connected to the side of the circuit board 120 close to the top plate of the housing 110.

[0064] Specifically, the first chamber can be used to accommodate some electrical components with larger volume, higher height or higher power, such as power inductors, busbar capacitors, power modules, switch tubes and other large electrical components. The second chamber can be used to accommodate some electrical components with smaller volume, lower height or lower power, such as chip capacitors, chip resistors, indicator lights and other small electrical components.

[0065] In some embodiments, the power conversion device 100 may further include a heat sink, which is connected to the side of the bottom plate of the housing 110 away from the circuit board 120. Therefore, the heat dissipation condition of the electrical components in the first chamber is better. Large electrical components have high power and high heat generation. Installing large electrical components on the side of the circuit board 120 close to the bottom plate of the housing 110 is conducive to improving the heat dissipation effect of the power conversion device.

[0066] It should be understood that conductive patterns or metal traces are disposed on both sides of the circuit board 120 .

[0067] It should be understood that the first chamber can also accommodate some electrical components with smaller volume and lower height, such as electrical components with smaller volume but higher heat generation, that is, the height of the electrical components connected to the side of the circuit board 120 close to the bottom plate can also be less than the first preset value. However, due to the height limit of the first chamber and the second chamber, the first chamber and the second chamber cannot accommodate electrical components with a height exceeding the limit.

[0068] It should be understood that, according to actual needs, the electrical components connected to the circuit board 120 can be reasonably arranged on both sides of the circuit board 120 to improve the space utilization of the power conversion device and enhance the heat dissipation effect of the power conversion device.

[0069] like Figure 4 As shown, the rotary switch 130 includes a switch body 131 and a handle assembly 132. The switch body 131 is located in the first chamber. The switch body 131 may include a plurality of wiring points and a plurality of contacts, and the switch body 131 may be connected to the circuit board 120 via one of the wiring points and the contacts.

[0070] It should be understood that the multiple wiring points can be used to connect the power source and the contact point can be used to connect the circuit board 120, or the multiple wiring points can be used to connect the circuit board 120 and the contact point can be used to connect the power source, which is not limited in the present embodiment. The power source can be the above-mentioned photovoltaic module.

[0071] In the embodiments of the present application, multiple wiring points are used to connect photovoltaic modules as an example for description.

[0072] In one example, when the multiple contacts of the switch body 131 are used to connect to the circuit board 120, the multiple contacts can be connected to the circuit board 120 by welding, such as Figure 4 As shown, the semicircle pattern filled with black represents the soldering point between the contact point and the circuit board 120.

[0073] It should be understood that the rotary switch in the present application can be a multi-pole switch, such as a bipolar switch, a tripolar switch, a quadrupole switch, etc., and the embodiments of the present application are not limited to this.

[0074] refer to Figure 4 and Figure 5 The switch body 131 may further include an insulating housing 1315, and a plurality of contacts and a plurality of wiring points of the switch 131 are located on an outer side wall of the insulating housing 1315. It is understood that the plurality of contacts and the plurality of wiring points are located on different outer side walls of the insulating housing 1315.

[0075] It should be understood that the material of the insulating shell 1315 is an insulating material, such as plastic.

[0076] The switch body 131 may further include an operating mechanism 1316 and a rotating shaft 1317. The operating mechanism may contain a plurality of metal connectors, and the metal connectors are located between two contacts of the same pole. The rotating shaft 1317 is connected to the metal connectors in the operating mechanism 1316, so that the metal connectors can rotate with the rotation of the rotating shaft 1317, thereby realizing the current switching capability of the rotary switch 130.

[0077] In the embodiment of the present application, the metal connector and the rotating shaft 1317 can be an integral structure or a separate structure. This is not limited in the embodiment of the present application. When the metal connector and the rotating shaft 1317 are a separate structure, the metal connector and the rotating shaft 1317 are two different components, and the two can be assembled together by means of snap connection, snap fit, screws, bolts, etc., and the two can be separated when disassembly is required. When the metal connector and the rotating shaft 1317 are an integral structure, the connection relationship between the metal connector and the rotating shaft 1317 cannot be separated. For example, the metal connector and the rotating shaft 1317 can be processed and manufactured by an integral molding method, and the metal connector can be a part of the rotating shaft 1317; for another example, the metal connector and the rotating shaft 1317 can be assembled by welding, riveting, etc.

[0078] The handle assembly 132 of the rotary switch 130 includes a rotary handle 1321 and a sleeve 1322. The rotary handle 1321 is located on the outer side of the housing 110 of the power conversion device. A through hole is provided on the side wall of the housing 110 near the rotary handle 1321, and the sleeve 1322 extends through the through hole into the accommodating cavity (specifically the first chamber) surrounded by the housing 110, and is rotatably connected to the rotating shaft 1316. That is, the rotary handle 1321 is rotatably connected to the rotating shaft 1316 through the sleeve 1322 extending into the accommodating cavity (specifically the first chamber) surrounded by the housing 110. When the user manipulates the rotary handle 1321 to rotate, the sleeve 1322 can be driven to rotate, thereby driving the rotating shaft 1316 to rotate, thereby realizing the function of turning the rotary switch 130 on and off the current.

[0079] Continue to refer Figure 4 and Figure 5 The plurality of wiring points are arranged along the Y direction (ie, the first direction) on the insulating housing 1315 , and the plurality of wiring points are connected to the photovoltaic components and are connected to the MPPT circuit in the circuit board 120 through the plurality of contacts.

[0080] Exemplarily, the multiple wiring points include a first wiring point 1311 and a second wiring point 1312, wherein the first wiring point 1311 is used to connect the positive pole of photovoltaic string #1, and the second wiring point 1312 is used to connect the negative pole of photovoltaic string #1, so that the direct current generated by the photovoltaic string using light energy is integrated into MPPT #1 on the circuit board 120.

[0081] Exemplarily, the multiple wiring points include a first wiring point 1311, a second wiring point 1312, a third wiring point 1313 and a fourth wiring point 1314, wherein the first wiring point 1311 is used to connect the positive pole of photovoltaic string #1, the second wiring point 1312 is used to connect the positive pole of photovoltaic string #2, the third wiring point 1313 is used to connect the negative pole of photovoltaic string #1, and the fourth wiring point 1314 is used to connect the negative pole of photovoltaic string #2, so that the direct current generated by photovoltaic string #1 and photovoltaic string #2 is integrated into the MPTT #1 circuit in the circuit board 120.

[0082] Exemplarily, the multiple wiring points include a first wiring point 1311, a second wiring point 1312, a third wiring point 1313 and a fourth wiring point 1314, wherein the first wiring point 1311 is used to connect the positive pole of photovoltaic string #1, the second wiring point 1312 is used to connect the negative pole of photovoltaic string #1, the third wiring point 1313 is used to connect the positive pole of photovoltaic string #2, and the fourth wiring point 1314 is used to connect the negative pole of photovoltaic string #2, so that the direct current generated by photovoltaic string #1 is connected to the MPPT #1 circuit in the circuit board 120, and the direct current generated by photovoltaic string #2 is connected to the MPTT #2 circuit in the circuit board 120.

[0083] In order to prevent the power conversion device from causing insulation breakdown and fire and other secondary disasters under high voltage due to changes in the external environment such as condensation and conductive pollution, the interlayer creepage distance is usually increased by adding an insulating structure to the insulating shell to meet the increasingly high voltage requirements of the photovoltaic system. However, in the actual process of photovoltaic string wiring, the rotary switch will use different wiring methods to merge into the MPPT circuit, and different polarities or different wiring correspond to different insulation requirements between layers. However, the unified insulation structure is difficult to adjust after the rotary switch is designed and finalized, and the insulation structure cannot be adjusted according to the insulation requirements formed by different wiring forms.

[0084] In the embodiment of the present application, the switch body 131 is formed with at least one protrusion on the surface of the insulating housing 1315 provided with a plurality of wiring points, each protrusion is located between two adjacent wiring points in the Y direction, and each protrusion extends along the X direction (i.e., the second direction) and protrudes from the surface 1315 where the plurality of wiring points are located along the Z direction (i.e., the third direction). For example, the plurality of protrusions include a first protrusion 13151 and a second protrusion 13152, the first protrusion 13151 is located between the first wiring point 1311 and the second wiring point 1312, and the second protrusion 13152 is located between the second wiring point 1312 and the third wiring point 1313.

[0085] The plurality of protrusions are also provided with grooves along the Z direction, and the grooves are used to insert the insulating plate 140, and the size of the insulating plate 140 along the Z direction is larger than the size of the grooves in the Z direction, that is, after the insulating plate is inserted into the groove, part of the volume of the insulating plate still extends out of the groove, so as to increase the creepage distance between two adjacent wiring points of the receiving groove. In other words, after the insulating plate 140 is inserted into the groove, the height of the insulating plate 140 relative to the insulating housing 1315 is larger than the height of the protrusion relative to the insulating housing 1315.

[0086] Exemplarily, when an insulating plate is inserted into the groove where the first protrusion 13151 is set, the insulating plate is used to increase the creepage distance between the layers where the first connection point 1311 and the second connection point 1312 are located; when an insulating plate is inserted into the groove where the second protrusion 13152 is set, the insulating plate is used to increase the creepage distance between the layers where the second connection point 1312 and the third connection point 1313 are located.

[0087] It should be understood that the size of the plurality of protrusions in the Z direction is greater than the size of the plurality of connection points in the Z direction, so that when the insulating plate 140 is not inserted into the groove, the switch body 131 can meet basic insulation requirements.

[0088] It should be understood that the number of raised portions between two adjacent wiring points may be one or more. For example, more raised portions may be provided on the insulating shell 1315 between the first wiring point 1311 and the second wiring point 1312, and more raised portions may be provided on the insulating shell between the second wiring point 1312 and the third wiring point 1313. The embodiment of the present application does not limit the number of raised portions between two adjacent wiring points.

[0089] It should be understood that the number of protrusions between the first wiring point 1311 and the second wiring point 1312 and the number of protrusions between the second wiring point 1312 and the third wiring point 1313 may be the same as or different from each other.

[0090] It should be understood that the length of the insulating plate 140 inserted into each groove extending out of the groove along the Z direction may be the same or different, and the embodiment of the present application does not limit this. For example, the length of the insulating plate 140 inserted into the groove provided by the first protrusion 13151 between the first wiring point 1311 and the second wiring point 1312 extending out of the groove along the Z direction is 3 mm, and the length of the insulating plate 140 inserted into the groove provided by the second protrusion 13152 between the second wiring point 1312 and the third wiring point 1313 extending out of the groove along the Z direction is 4 mm.

[0091] It should be understood that the number of insulating plates 140 that can be inserted into each groove can be one or more. For example, the groove set by the first protrusion 13151 between the first wiring point 1311 and the second wiring point 1312 can insert multiple insulating plates 140, and the groove set by the second protrusion 13152 between the second wiring point 1312 and the third wiring point 1313 can insert multiple insulating plates 140. The present application does not limit the number of insulating plates 140 that can be inserted into each groove.

[0092] It should be understood that the thickness of the insulating plate 140 inserted into each groove may be the same or different, and the embodiment of the present application does not limit this. For example, the thickness of the insulating plate 140 inserted into the groove provided by the first protrusion 13151 between the first wiring point 1311 and the second wiring point 1312 is 2 mm, and the thickness of the insulating plate 140 inserted into the groove provided by the second protrusion 13152 between the second wiring point 1312 and the third wiring point 1313 is 3 mm.

[0093] It should be understood that the material of the insulating plate 140 is an insulating material, such as plastic. The material of the insulating plate 140 may be the same as or different from the material of the insulating housing 1315.

[0094] In the embodiment of the present application, the insulating plate 140 can be fixed in the groove by a tight fit (such as an interference fit), or can be fixed in the groove by snapping, snapping, screws, bolts, etc., and the embodiment of the present application is not limited to this.

[0095] In the embodiment of the present application, when two adjacent connection points are used to connect the positive electrode and the negative electrode of the photovoltaic module respectively, an insulating plate can be inserted into the receiving groove between the two adjacent connection points. For example, when the first connection point 1311 is used to connect the positive electrode of the photovoltaic module and the second connection point 1312 is used to connect the negative electrode of the photovoltaic module, one or more insulating plates 140 can be inserted into the groove provided in the first protrusion 13151 between the first connection point 1311 and the second connection point 1312.

[0096] In an embodiment of the present application, a protrusion is formed on the insulating shell between two adjacent wiring points of different polarities for connecting photovoltaic components, and a groove is provided in the protrusion to insert an insulating plate, which can increase the creepage distance between the two adjacent wiring points, thereby ensuring the electrical performance stability and safety of the power conversion device.

[0097] Figure 6 It is a schematic diagram of an insertion method of an insulating plate provided in an embodiment of the present application.

[0098] like Figure 6 As shown in (a), the insulating plate 140 is inserted into the groove set by the protrusion 13151 between the first wiring point 1311 and the second wiring point 1312 along the Z direction, so that the first wiring point 1311 and the second wiring point 1312 are separated, thereby increasing the creepage distance between the first wiring point 1311 and the second wiring point 1312.

[0099] In the embodiment of the present application, the insulating plate can be inserted into the grooves provided on the plurality of raised portions on the insulating housing 1315 at the same time, such as Figure 6 As shown in (b), the insulating plate 141 is inserted into the groove set on the protrusion 13151 between the first wiring point 1311 and the second wiring point 1312 along the Y direction, and the insulating plate 142 is inserted into the groove set on the protrusion 13152 between the second wiring point 1312 and the third wiring point 1313 along the Y direction, thereby increasing the creepage distance between the first wiring point 1311 and the second wiring point 1312 and between the second wiring point 1312 and the third wiring point 1313.

[0100] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A power conversion device, characterized in that: include: A circuit board (120), the circuit board (120) being used to arrange electrical components, the electrical components being used for power conversion; A rotary switch (130), the rotary switch (130) comprising an insulating shell (1315), a first surface of the insulating shell (1315) being provided with a plurality of wiring points, the plurality of wiring points being arranged along a first direction on the first surface, a second surface of the insulating shell (1315) being provided with a plurality of contacts, one of the wiring points and the contacts being used to connect to a photovoltaic module, and the other of the wiring points and the contacts being used to connect to an electrical element on the circuit board (120), wherein: At least one protrusion is formed on the first surface, each of the protrusions is located between two adjacent wiring points in the first direction, each of the protrusions extends along a second direction on the first surface, the second direction is perpendicular to the first direction, and each of the protrusions protrudes from the first surface in a third direction, the third direction is perpendicular to the first surface, and each of the protrusions is provided with a groove opening in the third direction, the groove is used to accommodate an insulating plate (140), and the size of the insulating plate in the third direction is larger than the size of the groove in the third direction.

2. The power conversion device according to claim 1, characterized in that: The two connection points adjacent to each protrusion are used to connect two poles with opposite polarities in the photovoltaic component, or the two connection points adjacent to each protrusion are used to connect two poles with opposite polarities in the circuit board (120).

3. The power conversion device according to claim 1 or 2, characterized in that: The power conversion device further comprises a housing (110), and the insulating shell (1315) and the circuit board (120) are located in a receiving cavity surrounded by the housing (110).

4. The power conversion device according to claim 1 or 2, characterized in that: At least one maximum power point tracking (MPPT) circuit is arranged on the circuit board (120), and an input end of the at least one MPPT circuit is used to connect the multiple wiring points or the multiple contact points.

5. The power conversion device according to claim 1 or 2, characterized in that: The circuit board (120) is provided with a direct current-to-direct current conversion DC-DC circuit, and the input end of the DC-DC circuit is used to connect the multiple wiring points or the multiple contact points.

6. The power conversion device according to claim 5, characterized in that: The circuit board (120) is provided with a direct current-alternating current conversion DC-AC circuit, and the input end of the DC-AC circuit is used to connect the output end of the DC-DC circuit or the MPPT circuit.

7. The power conversion device according to claim 1 or 2, characterized in that: The number of the protrusions between two adjacent wiring points is one or more.

8. A rotary switch, characterized in that: include: An insulating shell (1315), wherein a first surface of the insulating shell (1315) is provided with a plurality of wiring points, wherein the plurality of wiring points are arranged along a first direction on the first surface, and a second surface of the insulating shell (1315) is provided with a plurality of contacts, wherein one of the wiring points and the contacts is used to connect a photovoltaic module, and the other of the wiring points and the contacts is used to connect a circuit board (120) in a power conversion device, wherein: At least one protrusion is formed on the first surface, each of the protrusions is located between two adjacent wiring points in the first direction, each of the protrusions extends along a second direction on the first surface, the second direction is perpendicular to the first direction, and each of the protrusions protrudes from the first surface in a third direction, the third direction is perpendicular to the first surface, and each of the protrusions is provided with a groove opening in the third direction, the groove is used to accommodate an insulating plate (140), and the size of the insulating plate in the third direction is larger than the size of the groove in the third direction.

9. The rotary switch according to claim 8, characterized in that: The two connection points adjacent to each protrusion are used to connect two poles with opposite polarities in the photovoltaic component, or the two connection points adjacent to each protrusion are used to connect two poles with opposite polarities in the circuit board (120).

10. The rotary switch according to claim 8 or 9, characterized in that: The number of the protrusions between two adjacent wiring points is one or more.

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