CN221282423U - Photovoltaic inverter - Google Patents

Abstract

The application provides a photovoltaic inverter comprising: a shell for accommodating the circuit board and the photovoltaic connector, wherein a through hole is formed on the shell; the photovoltaic connector comprises an insulating base and a metal plug connector, wherein the insulating base penetrates through the through hole and stretches into the shell, and the insulating base is fixed with the shell; the insulating base is of a hollow tubular structure, the metal plug connector penetrates through the insulating base to extend into the shell and is connected with the circuit board, the metal plug connector comprises an interface part, a fixing part and a contact part, and the fixing part is a cylindrical conductor; the inner wall of the insulating base is provided with a limiting structure, the peripheral surface of the fixing part is provided with a limiting protrusion, and the limiting structure is used for clamping the limiting protrusion in the circumferential direction of the fixing part. The photovoltaic connector is provided with an anti-rotation structure so as to limit the rotation of the metal plug connector, thereby being beneficial to reducing the installation difficulty of the photovoltaic connector and avoiding the damage of the photovoltaic connector caused by torsion.

Description

Photovoltaic inverter

Technical Field

The application relates to the technical field of photovoltaics, in particular to a photovoltaic inverter.

Background

In a photovoltaic power generation system, a photovoltaic inverter may convert input direct current into alternating current. The photovoltaic inverter comprises a photovoltaic connector, and one end of a metal plug connector of the photovoltaic connector is required to be connected with a circuit board. When the photovoltaic connector is installed, the metal plug connector is easy to interfere with the upper plate support or the circuit board, so that the assembly difficulty is increased, and poor contact can be caused. Moreover, the metal plug connector is easy to damage because the cable is often plugged in and plugged out in the using process.

Disclosure of Invention

The application provides a photovoltaic inverter, wherein a photovoltaic connector of the photovoltaic inverter is provided with an anti-rotation structure so as to prevent a metal plug connector of the photovoltaic connector from rotating, thereby being beneficial to reducing the installation difficulty of the photovoltaic connector, improving the assembly efficiency of the photovoltaic inverter and avoiding the damage of the photovoltaic connector caused by torsion.

In a first aspect, there is provided a photovoltaic inverter comprising: the photovoltaic connector and the shell are used for accommodating the circuit board, and through holes are formed in the shell; the photovoltaic connector comprises an insulating base and a metal plug connector, one end of the insulating base is positioned in the shell, the other end of the insulating base is positioned outside the shell, and the photovoltaic connector is fixed on the shell through the insulating base; the insulation base is of a hollow tubular structure, the metal plug connector is wrapped in the insulation base and comprises an interface part, a fixing part and a contact part, the interface part is used for being connected with the photovoltaic module, the contact part is used for being connected with the circuit board, the fixing part is located between the interface part and the contact part and is a cylindrical conductor, the fixing part is located in the insulation base and is used for fixing the metal plug connector and the insulation base; the inner wall of the insulating base is provided with a limiting structure, the peripheral surface of the fixing part is provided with a limiting protrusion, and the limiting structure is used for clamping the limiting protrusion in the peripheral direction of the fixing part.

In the embodiment of the application, the inner wall of the insulating base is provided with the limiting structure, and the fixing part of the metal plug connector is provided with the limiting protrusion correspondingly, and the limiting structure and the limiting protrusion are clamped together in the circumferential direction of the fixing part, so that the metal plug connector is prevented from rotating relative to the insulating base. The metal plug connector can be fixed at a proper angle, so that the metal plug connector is convenient to connect with the circuit board, and the assembly difficulty of the photovoltaic connector is reduced; meanwhile, the part of the metal plug connector, which is connected with the circuit board, can be tightly attached to the circuit board, so that poor contact is avoided; in addition, the metal plug connector can not rotate relative to the insulating base, so that the metal plug connector is prevented from being twisted and damaged due to the fact that the cable is plugged and pulled for many times.

With reference to the first aspect, in one possible implementation manner, the limiting structure is plate-shaped, the limiting structure is parallel to the axis of the fixing portion, at least one end of the limiting structure is fixed to the inner wall of the insulating base, and a distance between the limiting structure and the axis is greater than or equal to a radius of the fixing portion; the limiting protrusion comprises a first protruding portion and a second protruding portion, the first protruding portion and the second protruding portion are respectively in contact with the limiting structure, and contacts of the first protruding portion, the second protruding portion and the limiting structure are located on two sides of projection of the axis on the limiting structure.

With reference to the first aspect, in one possible implementation manner, a height of the first protruding portion and the second protruding portion is greater than a shortest distance between the limiting structure and a peripheral surface of the fixing portion.

With reference to the first aspect, in one possible implementation manner, the limiting structure is a groove formed on an inner wall of the insulating base, and the limiting protrusion is inserted into the groove.

With reference to the first aspect, in one possible implementation manner, the limiting structure is a first support column formed on an inner wall of the insulating base, one end of the first support column is fixed on the inner wall of the insulating base, the other end of the first support column extends towards the metal plug connector, the limiting protrusion includes a first protruding portion and a second protruding portion, the first protruding portion and the second protruding portion are in contact with the first support column, and at least part of the first support column is located between the first protruding portion and the second protruding portion.

With reference to the first aspect, in one possible implementation manner, a second support column is formed on an inner wall of the insulating base, the second support column and the limiting structure are oppositely arranged, one end of the second support column is fixed on the inner wall of the insulating base, the other end of the second support column extends towards the metal plug connector, and the other end of the second support column abuts against the peripheral surface of the fixing portion.

With reference to the first aspect, in one possible implementation manner, an inner diameter of at least a portion of the insulating base and a diameter of the fixing portion are equal.

In the embodiment of the application, the metal plug connector cannot move towards the direction away from the limiting structure, so that the change of the position relationship between the limiting protrusion and the limiting structure is avoided.

With reference to the first aspect, in one possible implementation manner, the positive metal plug connector includes an elastic buckle, where the elastic buckle is located on one side of a portion with equal diameters of the insulating base and the fixing portion, and one end of the elastic buckle, which is far away from the portion with equal diameters of the insulating base and the fixing portion, is fixed on the peripheral surface of the fixing portion, and the elastic buckle is tilted near one end of the portion with equal diameters of the insulating base and the fixing portion; a third protruding portion is formed on the peripheral surface of the fixing portion, and the third protruding portion is located on the other side of the portion where the diameters of the insulating base and the fixing portion are equal.

In the embodiment of the application, the elastic buckle and the third protruding part are clamped with the insulating base and the part with the same diameter of the fixing part in the axial direction of the fixing part, so that the metal plug connector is limited to move along the axial direction of the fixing part, and the position relation between the limiting protrusion and the limiting structure is prevented from being changed.

With reference to the first aspect, in one possible implementation manner, the contact portion of the metal plug connector is a sheet structure, and the contact portion includes a first portion, a second portion and a third portion, where the first portion is connected with the circuit board, the third portion is connected with the fixing portion, the second portion is located between the first portion and the third portion, and the second portion extends toward the circuit board so that the third portion is attached to the circuit board.

In the embodiment of the application, the contact part of the metal plug connector can be bent, so that the first part of the contact part is attached to the circuit board, and the first part of the contact part is convenient to connect with the circuit board.

With reference to the first aspect, in one possible implementation manner, the first portion of the contact portion is parallel to the circuit board.

In the embodiment of the application, the contact part is of a sheet structure, and based on the structure of the photovoltaic connector, the metal plug connector cannot rotate in the insulation base, and the first part of the contact part is parallel to the circuit board, so that the first part of the contact part can be tightly attached to the circuit board, and poor contact is avoided.

With reference to the first aspect, in a possible implementation manner, the portion of the contact portion located in the insulating base includes at least one protruding structure, and at least one groove is provided on an inner wall of the insulating base, and the at least one protruding structure is inserted into the at least one groove.

In the embodiment of the application, the convex structure on the contact part is matched with the groove on the inner wall of the insulating base, so that the metal plug connector is further limited to rotate relative to the insulating base, the installation difficulty of the photovoltaic connector is reduced, the assembly efficiency of the photovoltaic inverter is improved, and the photovoltaic connector is prevented from being damaged due to torsion.

Drawings

Fig. 1 is a schematic diagram of a photovoltaic power generation system according to an embodiment of the present application.

Fig. 2 is a schematic diagram of a circuit structure of a photovoltaic inverter according to an embodiment of the present application.

Fig. 3 is a schematic diagram of a structure of a photovoltaic inverter according to an embodiment of the present application.

Fig. 4 is a schematic diagram of a structure of a photovoltaic inverter according to an embodiment of the present application.

Fig. 5 is a schematic view of a structure of a photovoltaic connector according to an embodiment of the present application.

Fig. 6 is a schematic structural diagram of a metal plug of a photovoltaic connector according to an embodiment of the present application.

Fig. 7 is a schematic diagram of a connection between a metal plug and a circuit board according to an embodiment of the present application.

Fig. 8 is a schematic cross-sectional view of a photovoltaic connector according to an embodiment of the present application.

Fig. 9 is a schematic cross-sectional view of another photovoltaic connector according to an embodiment of the present application.

Fig. 10 is a schematic cross-sectional view of yet another photovoltaic connector provided by an embodiment of the present application.

Fig. 11 is a cross-sectional view of a photovoltaic connector according to an embodiment of the present application.

Fig. 12 is a cross-sectional view of another photovoltaic connector provided by an embodiment of the present application.

Fig. 13 is a schematic structural diagram of a metal plug of a photovoltaic connector according to an embodiment of the present application.

Fig. 14 is a schematic cross-sectional view of a photovoltaic connector according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

In the description of the embodiments of the present application, unless otherwise indicated, "/" means or, for example, a/B may represent a or B; "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone.

In the embodiment of the application, prefix words such as "first", "second" and "third" are used merely to distinguish different description objects, and there is no limitation on the position, sequence, priority, number or content of the described objects. The use of ordinal words and the like in embodiments of the present application to distinguish between the prefix words used to describe an object does not limit the described object, and statements of the described object are to be read in the claims or in the context of the embodiments and should not constitute unnecessary limitations due to the use of such prefix words. In addition, in the description of the present embodiment, unless otherwise specified, the meaning of "a plurality" is two or more.

The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", and the like in the embodiments of the present application are directional or positional relationships based on the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.

Reference in the specification to "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in some embodiments" or the like in various places throughout this specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.

The term "vertical" in the present application is not strictly vertical but is within the allowable error range. "parallel" is not strictly parallel but is within the tolerance of the error.

In the embodiments of the present application, the same reference numerals denote the same components or the same parts. In the embodiment of the present application, for a plurality of identical components, reference numerals may be given to only one of the components in the drawings. The same reference numerals are used for other identical parts or components. In addition, the dimensions and sizes of the components shown in the drawings are merely exemplary.

The following describes in detail the photovoltaic power generation system provided in the embodiment of the present application with reference to fig. 1.

Fig. 1 is a schematic diagram of a photovoltaic power generation system according to an embodiment of the present application. As shown in fig. 1, the photovoltaic power generation system may include: photovoltaic module 10, photovoltaic inverter 20, and energy storage system 30.

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

Specifically, the photovoltaic inverter 20 is capable of converting direct current from the photovoltaic module 10 into alternating current and delivering the alternating current to the grid 40 or the load 50. The photovoltaic inverter 20 is capable of delivering direct current from the photovoltaic module 10 to the energy storage system 30 for charging the energy storage system 30. The photovoltaic inverter 20 is capable of converting direct current from the energy storage system 30 to alternating current and delivering the alternating current to the grid 40 or the load 50.

It will be appreciated that when the photovoltaic power generation system includes the photovoltaic module 10, the photovoltaic inverter 20 and the energy storage system 30, the photovoltaic inverter 20 is mainly used to connect the photovoltaic module 10 and the energy storage system 30, so that the energy storage system 30 is charged. When the photovoltaic power generation system includes the photovoltaic module 10, the photovoltaic inverter 20, the energy storage system 30, the grid 40, and the load 50, the photovoltaic inverter 20 can be used to connect the above devices. For example, the photovoltaic inverter 20 connects the photovoltaic module 10 with the energy storage system 30; the photovoltaic inverter 20 connects the photovoltaic module 10 with the power grid 40; the photovoltaic inverter 20 connects the photovoltaic module 10 to the load 50; the photovoltaic inverter 20 connects the load 50 with the energy storage system 30, and so on.

The energy storage system 30 in the photovoltaic power generation system enables storage and release of electrical energy. For example, the energy storage system 30 may store dc electrical energy from the photovoltaic module 10, and the energy storage system 30 may power the grid 40 or the load 50 via the photovoltaic inverter 20. Accordingly, the energy storage system 30 has a wide range of applications including, but not limited to: a household scene, an industry green electricity scene, an intelligent photovoltaic power station scene and the like.

As is apparent from the above description, the photovoltaic inverter 20 is a converter capable of converting direct current into alternating current. For example, the photovoltaic inverter 20 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 10 and the energy storage system 30, for example, the dc port 1 is used to connect the photovoltaic module 10, and the dc port 2 is used to connect the energy storage system 30; the ac port may be used to connect the grid 40 or the load 50.

The photovoltaic module 10 can feed the power grid 40 via the dc port 1 and supply the load 50. The energy storage system 30 may supply power to the load 50 through the dc port 2. The grid 40 may supply power to the load 50 through the ac port. In other words, the photovoltaic inverter 20 is a connection hub between the load 50 and an energy module (which may include the photovoltaic module 10, the energy storage system 30, and the grid 40).

Fig. 2 is a schematic diagram of a circuit structure of a photovoltaic inverter according to an embodiment of the present application.

Referring to fig. 2, in the photovoltaic power generation system, the photovoltaic inverter includes components such as a rotary switch, a photovoltaic connector, an ac connector, and the like. Wherein the photovoltaic connector (PV connector) is used for inputting direct current generated by the photovoltaic module by utilizing light energy; the rotary switch mainly plays a role in switching on and off current; an inverter circuit (DC/AC circuit) for converting a direct current into an alternating current, and a direct current-to-direct current circuit (DC/DC circuit) for converting one voltage value into another voltage value in the direct current circuit; the alternating current connector is used for conveying alternating current to a power grid and/or a load;

It should be noted that the DC/AC circuit and the DC/DC circuit are disposed on a circuit board of the photovoltaic inverter, and components such as a rotary switch, a photovoltaic connector, a signal connector, and an AC connector of the photovoltaic inverter are directly connected to the circuit board and are connected to each other through metal wires on the circuit board to form the circuit structure shown in fig. 2. Like this, realize exempting from the cable to connect between rotary switch, photovoltaic connector, alternating current connector and the circuit board to promote photovoltaic inverter's space utilization.

It should be understood that, to implement the function of the photovoltaic inverter, the circuit board may further include other circuits, such as a rectifying circuit (AC/DC circuit) for converting alternating current into direct current, etc., and the type and number of the circuits provided on the circuit board are not limited in the embodiment of the present application.

In the present application, the circuit board 120 may also be called a printed circuit board or a motherboard, and the printed circuit board is a support for electronic components and also serves as a carrier for electrical connection of the electronic components. In general, a printed circuit board without soldered electronic components may be referred to as a PCB veneer. The printed circuit board to which the electronic components are soldered may be referred to as a printed circuit board assembly (printed circuit board assembly, PCBA). The circuit board is provided with a conductive pattern or a metal wire, and the electronic element can be electrically connected through the conductive pattern or the metal wire. The electronic components carried on the circuit board may form a plurality of functional modules to achieve corresponding functions, for example, an inverter circuit module for converting direct current into alternating current, a rectifier circuit module for converting alternating current into direct current, and the like.

Fig. 3 is a schematic diagram of a structure of a photovoltaic inverter 100 according to an embodiment of the present application. Fig. 4 is a schematic diagram of a structure of a photovoltaic inverter 100 according to an embodiment of the present application. The photovoltaic inverter 100 shown in fig. 3 and 4 may be one exemplary configuration of the photovoltaic inverter 20 shown in fig. 1.

Referring to fig. 3 and 4, the photovoltaic inverter 100 includes a housing 110, a circuit board 120, and a photovoltaic connector 130. The housing 110 may include a top plate, a bottom plate, and side plates, and the top plate, the bottom plate, and the side plates of the housing 110 may enclose a receiving chamber, wherein the top plate and the bottom plate of the housing 110 are disposed opposite to each other.

The circuit board 120 is located in the accommodating cavity enclosed by the housing 110, and the accommodating cavity enclosed by the housing 110 is divided into a first chamber and a second chamber by the circuit board 120. The first chamber is an accommodating space surrounded by the bottom plate of the housing 110, the side plate of the housing 110 and the circuit board 120, and the second chamber is an accommodating space surrounded by the top plate of the housing 110, the side plate of the housing 110 and the circuit board 120. And, the distance between the circuit board 120 and the bottom plate of the housing 110 is greater than the distance between the circuit board 120 and the top plate of the housing 110, i.e., the height of the first chamber is greater than the height of the second chamber.

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

In the embodiment of the present application, both sides of the circuit board 120 are provided with conductive patterns or metal traces, and both sides of the circuit board 120 are mounted with electrical components. That is, a portion of the electrical components is located in the first chamber, and the portion of the electrical components is connected to a side of the circuit board 120 adjacent to the bottom plate of the housing 110; another portion of the electrical components is located in the second chamber, which is connected to the side of the circuit board 120 near the top plate of the housing 110.

In particular, the first chamber may be used to house some large electrical components, such as power inductors, bus capacitors, power modules, and switching tubes, that are large in size, high in height, or high in power. The second chamber may be used to house small electrical components such as chip capacitors, chip resistors, indicator lights, etc. that are small in size, low in height, or low in power. The first chamber is used for accommodating electrical components with a height greater than or equal to a first preset value, and the second chamber is used for accommodating electrical components with a height less than or equal to a second preset value, and the first preset value is greater than the second preset value. That is, the height of the electrical component connected to the side of the circuit board near the bottom plate is greater than or equal to a first preset value, and the height of the electrical component connected to the side of the circuit board near the top plate is less than or equal to a second preset value. The first preset value and the second preset value may be preset by a technician, for example, the first preset value may be about 9mm and the second preset value may be about 5mm.

In some embodiments, the photovoltaic inverter 100 may further include a heat sink, the heat sink being connected to a side of the bottom plate of the housing 110 remote from the circuit board 120. Therefore, the heat dissipation condition of the electric element in the first chamber is good. The large-sized electric element has larger power and larger heating value, and the large-sized electric element is arranged on one side of the circuit board 120, which is close to the bottom plate of the shell 110, so that the heat dissipation effect of the photovoltaic inverter is improved.

The first chamber may also house some small-sized, low-height electrical components, such as small-sized but high-heat-generating electrical components, i.e., electrical components connected to the side of the circuit board 120 near the bottom plate may also have a height less than a first preset value. However, due to the limitation of the height of the first and second chambers, the first and second chambers cannot accommodate electrical components having a height exceeding the limitation.

According to actual needs, the electrical components connected with the circuit board 120 may be reasonably arranged on two sides of the circuit board 120, so as to improve the space utilization rate of the photovoltaic inverter and improve the heat dissipation effect of the photovoltaic inverter.

In the photovoltaic power generation system, one end of the photovoltaic connector 130 is connected to the photovoltaic module (or photovoltaic string), and the other end is connected to the circuit board 120 and is connected to the DC/DC circuit or the DC/AC circuit through the metal wiring on the circuit board 120, thereby inputting direct current generated by the photovoltaic module using the light energy. The photovoltaic connector 130 may include a plurality of positive connectors and a plurality of negative connectors. The positive connector is a connector connected with the positive electrode of the photovoltaic module, and the negative connector is a connector connected with the negative electrode of the photovoltaic module. The positive connectors and the negative connectors are in one-to-one correspondence, and the positive connectors and the negative connectors which correspond to each other are connected with the same photovoltaic module.

Referring to fig. 3 and 4, the photovoltaic connector 130 may include a positive connector 131 and a negative connector 132. Two through holes are provided on the side wall of the housing 110, and the positive connector 131 and the negative connector 132 respectively extend into the first chamber through one of the through holes, and are connected to the circuit board 120.

It should be appreciated that the photovoltaic connector 130 may include a plurality of positive connectors and a plurality of negative connectors, which are not limited by embodiments of the present application.

The positive connector 131 will be described as an example. Fig. 5 is a schematic view of a structure of a photovoltaic connector according to an embodiment of the present application. Fig. 6 is a schematic view of a structure of a metal plug of a photovoltaic connector according to an embodiment of the present application. Fig. 7 is a schematic diagram of a connection between a metal plug and a circuit board according to an embodiment of the present application.

Referring to fig. 4 and 5, the positive connector 131 includes an insulating base 1311 and a positive metal plug 1312. The insulating base 1311 protrudes into the first chamber through the first through hole 111 on the sidewall of the housing 110, and the insulating base 1311 and the housing 110 are fixedly connected.

In the present application, specific ways of securing the connection include, but are not limited to, one or more of the following: bonding, welding, screw fastening connection, clamping connection and riveting.

Illustratively, a portion of the insulating base 1311 located outside the housing 110 has a diameter larger than that of the first through hole 111, and a portion of the insulating base 1311 located in the accommodating chamber surrounded by the housing 110 is provided with threads on an outer circumferential wall thereof, so that the insulating base 1311 can be fixedly coupled to the housing 110 by screw fastening.

It should be noted that each of the photovoltaic connectors includes an insulating base and a metal plug, and each of the photovoltaic connectors may correspond to one of the through holes on the housing 110.

It should be noted that the insulating base may be understood as a part of the photovoltaic connector, or may be understood as a part of the housing 110. When the insulating base is a component of the housing 110, the insulating base and the housing 110 may be in a unitary structure, or may be in a separate structure, which is not limited in the embodiment of the present application. When the insulating base and the shell 110 are in a separated structure, the insulating base and the shell 110 are two different components, and can be assembled together in a clamping, buckling, screwing, bolting and other modes, and can be separated when the insulating base and the shell are required to be disassembled. When the insulating base and the housing 110 are of an integrated structure, the connection relationship between the insulating base and the housing 110 cannot be separated. For example, the insulating base and the housing 110 may be manufactured by integrally forming, and the insulating base is a part of the housing 110; for another example, the insulating base and the housing 110 may be assembled by a connection method such as caulking.

The insulating base 1311 is a hollow tubular structure, and as shown in fig. 4 and 5, the insulating base 1311 may communicate with an external space of the housing 110 and a receiving chamber surrounded by the housing 110.

In one example, the insulating base 1311 is provided with a second through hole 13111, and the second through hole 13111 may communicate with an external space of the housing 110 and a receiving cavity surrounded by the housing 110.

In an embodiment of the present application, the positive metal plug 1312 protrudes into the first cavity of the housing 110 through the insulating base 1311 and is connected to a side of the circuit board 120 near the bottom plate of the housing 110.

Referring to fig. 4 to 6, the positive metal plug 1312 includes an interface portion, a fixing portion, and a contact portion. The interface part is used for being connected with the photovoltaic module; the contact portion is for connection with the circuit board 120; the fixing part is positioned between the interface part and the contact part, one end of the fixing part is connected with the interface part, and the other end is connected with the contact part.

Referring to fig. 6, the contact portion may include a first portion, a second portion, and a third portion. Wherein, the first part of the contact part is the connection part of the positive metal plug 1312 and the circuit board 120; the third part of the contact part is connected with the fixing part; the second part of the contact is located between the first part and the third part, i.e. one end of the second part is connected to the first part and the other end is connected to the third part.

In the embodiment of the application, the contact part is of a sheet-shaped structure; the interface portion and the fixing portion may have a cylindrical structure, or may have a hollow cylindrical structure. The interface portion, the fixing portion, and the third portion of the contact portion of the positive metal plug 1312 are located inside the insulating base, and the first portion and the second portion of the contact portion are located outside the insulating base 1311.

With continued reference to fig. 6, the structure of the contact portion is similar to a zig-zag shape, the first and third portions of the contact portion may be parallel to the circuit board 120, and the second portion of the contact portion may be perpendicular to the circuit board 120. It is understood that the contact portions may be bent to be proximate to the circuit board 120. That is, the contact portion is bent at the connection of the second portion and the third portion, and the contact portion is bent at the connection of the first portion and the second portion, so that the second portion of the contact portion extends toward the circuit board 120, and the first portion of the contact portion and the circuit board 120 are bonded together.

In some embodiments, the third portion of the contact may not be located within the insulating base 1311, or only a portion of the third portion of the contact may be located within the insulating base 1311.

Referring to fig. 4 and 7, the photovoltaic inverter 100 may further include an upper plate holder 140, the upper plate holder 140 being located in the first chamber, and the upper plate holder 140 being fixedly connected with the bottom plate of the housing 110.

The material of the upper plate bracket is an insulating material, such as plastic.

The upper plate bracket 140 serves to support a portion (i.e., a first portion of the contact portion) where the positive metal plug 1312 and the circuit board 120 are connected. Specifically, the upper board support 140 may include a positive support column 141, where a first portion of the contact portion of the positive metal plug 1312 is overlapped on a side of the positive support column 141 near the circuit board 120, and the height of the positive support column 141 is similar to that of the circuit board 120, so that the first portion of the contact portion of the positive metal plug 1312 is attached on a side of the circuit board 120 near the bottom plate of the housing 110. It is understood that the circuit board 120, the first portion of the contact portion of the positive metal plug 1312, and the first support post 141 are stacked, and the first portion of the contact portion is located between the positive support post 141 and the circuit board 120. Thus, the connection stability between the positive metal connector 1312 and the circuit board 120 can be improved, and poor contact can be avoided.

It should be understood that the height of the positive electrode support column 141 is the distance between the side of the positive electrode support column 141 near the circuit board 120 and the bottom plate of the case 110. The height of the circuit board 120 is the distance between the lower surface of the circuit board 120 (i.e., the side of the circuit board 120 that is adjacent to the bottom plate of the housing 110) and the bottom plate of the housing 110.

There are various ways to fixedly or electrically connect the circuit board 120 to the first portion of the contact. Illustratively, referring to fig. 7, the first portion of the contact portion and the circuit board 120 include two through holes disposed opposite to each other, and at the same time, a blind hole is disposed at an end of the positive electrode support column 141 near the circuit board 120, and a nut is disposed in the blind hole. Metal screws are inserted into the blind holes of the positive electrode support column 141 through the two oppositely disposed through holes, and are screwed with metal nuts. Thus, the first portion of the contact is fixedly connected to the circuit board 120, and the first portion of the contact is electrically connected to the metal trace on the circuit board 120.

In some embodiments, the metal nut and the positive support post 141 disposed in the blind hole may be snapped together, the metal nut may not be able to rotate in the blind hole, but the metal nut may be moved in a direction perpendicular to the circuit board 120. When the screw is tightened, the nut is forced towards the circuit board 120, thereby pressing the first part of the contact tightly against the circuit board 120.

In the actual assembly process, the insulating base 1311 is first inserted into the first through hole 111 of the housing 110 and fixedly connected with the housing 110; then, the positive metal plug 1312 is inserted into the insulating base 1311; pushing the positive support column 141 of the upper plate bracket 140 to the lower part of the first part of the contact part of the positive metal plug 1312, so that the first part of the contact part is attached to the circuit board 120; finally, the circuit board 120 and the first portion of the contact portion are connected.

If the positive metal plug 1312 rotates, the first portion of the contact portion is not parallel to the circuit board 120, and the first portion of the contact portion cannot be attached to the circuit board 120, which increases the difficulty in mounting the photovoltaic inverter and may cause poor contact. In addition, in the actual use process, the user may plug the cable several times, so that the positive metal plug 1312 rotates, and the contact portion is twisted to break.

In the embodiment of the present application, a limiting structure is formed on the inner wall of the insulating base 1311, and a limiting protrusion is formed on the peripheral surface of the fixing portion of the positive metal plug 1312, where the limiting structure is used to engage with the limiting protrusion in the circumferential direction of the fixing portion, so as to prevent the positive metal plug 1312 from rotating in the insulating base 1311.

The limit structure formed on the inner wall of the insulating base 1311 and the limit projection formed on the peripheral surface of the fixing portion of the positive metal plug 1312 will be described in detail with reference to the accompanying drawings.

Fig. 8 is a schematic cross-sectional view of the photovoltaic connector shown in fig. 4 taken at A-A. Fig. 8 (a), fig. 8 (b), and fig. 8 (c) are schematic cross-sectional views of three different structures, respectively.

Referring to fig. 6 and 8 (a), the insulating base 1311 includes a limit plate 13112, both ends of the limit plate 13112 are fixed to an inner wall of the insulating base 1311, and a distance between the limit plate 13112 and an axis of a fixed portion of the positive metal plug 1312 is greater than or equal to a radius of the fixed portion. That is, the stop plate 13112 does not affect the mounting position of the positive metal plug 1312.

The side of the limiting plate 13112 near the fixing portion may be a plane, and the axes of the limiting plate 13112 and the fixing portion are disposed in parallel, that is, the distances between the axes of the limiting plate 13112 and the fixing portion are equal everywhere.

In some embodiments, the axes of the stop plate 13112 and the retainer may not be parallel.

In some embodiments, the stop plate 13112 is perpendicular to the circuit board 120.

The first projection 13121 and the second projection 13122 are provided on the peripheral wall of the fixing portion of the positive metal plug 1312. The first protrusion 13121 abuts the limiting plate 13112 to limit clockwise rotation of the positive metal plug 1312, while the second protrusion 13122 abuts the limiting plate 13112 to limit counterclockwise rotation of the positive metal plug 1312. Specifically, the first protruding portion and the second protruding portion are respectively in contact with the limiting plate, and contact points of the first protruding portion and the second protruding portion with the limiting plate are located on two sides of projection of an axis of the fixing portion on the limiting plate.

The contact points of the first protrusion 13121, the second protrusion 13122 and the stop plate may not be unique, and then there should be at least one contact point of the first protrusion 13121 and the stop plate 13112 on one side of the projection of the axis of the fixation section onto the stop plate, and at least one contact point of the second protrusion 13122 and the stop plate 13112 on the other side of the projection of the axis of the fixation section onto the stop plate.

Referring to fig. 8, it is assumed that the fixing portion is divided into upper and lower portions by a dividing plane, wherein the dividing plane is perpendicular to the limiting plate 13112, and the dividing plane passes through an axis of the fixing portion. The first protruding portion 13121 is located at one side of the upper portion of the fixing portion, which is close to the limiting plate 13112, and abuts against the limiting plate 13112; the second protrusion 13122 is located at a side of the lower portion of the fixing portion near the limiting plate 13112, and abuts against the limiting plate 13112. That is, the first protrusion 13121 is located between the upper portion of the fixing portion and the limiting plate 13112, and the second protrusion 13122 is located between the lower portion of the fixing portion and the limiting plate 13112.

If the limiting plate 13112 is divided into upper and lower parts by a dividing plane, wherein the dividing plane is perpendicular to the limiting plate 13112 and passes through the axis of the fixing part. The contact point of the first protrusion 13121 and the stopper plate 13112 is located at the upper portion of the stopper plate 13112 and the contact point of the second protrusion 13122 and the stopper plate 13112 is located at the lower portion of the stopper plate 13112. That is, the contact points of the first and second protrusions 13121 and 13122 with the stopper plate 13112 are located at both sides of the dividing plane, respectively.

The contact points of the first protrusion 13121, the second protrusion 13122 and the limiting plate may not be unique, and thus there should be at least one contact point of the first protrusion 13121 and the limiting plate 13112 on one side of the dividing plane, and at least one contact point of the second protrusion 13122 and the limiting plate 13112 on the other side of the dividing plane.

The heights of the first and second protrusions 13121 and 13122 are greater than the shortest distance between the outer peripheral wall of the fixed portion and the limit plate 13112. The height of the protruding portion refers to the height of the protruding portion in the radial direction of the fixing portion, that is, the distance between the protruding portion and the outer peripheral wall of the fixing portion in the radial direction of the fixing portion. Or the height of the protruding portion may also refer to the distance between the contact point of the protruding portion and the stopper plate and the outer peripheral wall of the fixing portion in the radial direction of the fixing portion. If the contact points of the protrusion and the limiting plate are not unique, the first protrusion 13121 and the limiting plate 13112 should have at least one contact point with a height greater than the shortest distance between the outer circumferential wall of the fixing portion and the limiting plate 13112, and the second protrusion 13122 and the limiting plate 13112 should have at least one contact point with a height greater than the shortest distance between the outer circumferential wall of the fixing portion and the limiting plate 13112.

In some embodiments, referring to fig. 8 (b) and (c), the sides of the first and second protrusions 13121 and 13122 near the limiting plate 13112 are planar, and the planes of the first and second protrusions 13121 and 13122 near the limiting plate 13112 are parallel to the limiting plate 13112 and fit over the limiting plate 13112.

In some embodiments, referring to (c) of fig. 8, the first protrusion 13121 and the second protrusion 13122 may be connected to each other as one body.

Fig. 9 is a schematic cross-sectional view of the photovoltaic connector shown in fig. 4 taken at A-A. As shown in fig. 9 (a), one end of the stopper plate 13112 is fixed to the inner wall of the insulating base 1311. That is, at least one end of the limiting plate 13112 in the embodiment of the application is fixed to the inner wall of the insulating base 1311.

As shown in fig. 9 (b), the insulating base 1311 is formed to be a limiting plane 13113 near the inner walls of the first and second protrusions 13121 and 13122. That is, the inner wall of the insulating base 1311 may not be a regular circle. It will be appreciated that the structure of fig. 9 (a) is such that the limiting plane 13113 is formed by the side of the limiting plate 13112 close to the positive metal plug 1312, and the side of the limiting plate 13112 remote from the positive metal plug 1312 is integrally connected to the inner wall of the insulating base 1311. In this case, the stopper plate 13112 is a part of the insulating base 1311.

Wherein the contact point of the first protrusion 13121 and the limiting plane 13113 is located on one side of the projection of the axis of the fixed portion on the limiting plane 13113, and the contact point of the second protrusion 13122 and the limiting plane 13113 is located on the other side of the projection of the axis of the fixed portion on the limiting plane 13113.

Similar to the embodiment shown in fig. 8, it is assumed that there is a dividing plane that divides the fixing portion into two parts, the dividing plane passing through the axis of the fixing portion, and the dividing plane being perpendicular to the limiting plane 13113. The point of contact of the first protrusion 13121 and the stop plane 13113 is located on one side of the split plane and the point of contact of the second protrusion 13122 and the stop plane 13113 is located on the other side of the split plane.

In some embodiments, the limiting surface 13113 may also be a curved surface.

As shown in fig. 9 (c), at least one limit groove 13114 is formed on the inner wall of the insulating base 1311, and at least one protrusion is provided on the fixing portion, and is inserted into the at least one limit groove 13114 to limit the rotation of the positive metal plug 1312 with respect to the insulating base 1311.

Fig. 10 is a schematic cross-sectional view of the photovoltaic connector shown in fig. 4 taken at A-A. As shown in fig. 10, a first support column 13115 and a second support column 13116 are disposed opposite to each other in the insulating base 1311, one ends of the first support column 13115 and the second support column 13116 are fixed to an inner wall of the insulating base 1311, and the other ends of the first support column 13115 and the second support column 13116 extend toward a fixing portion of the positive metal plug 1312. Wherein the first support post 13115 is in contact with both the first protrusion 13121 and the second protrusion 13122, and the first support post 13115 is at least partially positioned between the first protrusion 13121 and the second protrusion 13122 to limit rotation of the metal plug relative to the insulating base 1311. The distance between the end of the second support column 13116 near the positive metal plug 1312 and the axis of the fixing portion of the positive metal plug 1312 is equal to or similar to the radius of the fixing portion. That is, an end of the second support column 13116 near the positive metal plug 1312 abuts against the circumferential surface of the positive metal plug 1312 to limit the positive metal plug 1312 from moving in a direction away from the first support column 13115. Thus, the positional relationship between the first protrusion 13121, the second protrusion 13122, and the first support column 13115 cannot be changed, and the metal-to-metal connector 1312 cannot be rotated within the insulating base 1311.

In some embodiments, the first support column 13115 may be plate-shaped so that the first support column 13115 may be conveniently inserted between the first protrusion 13121 and the second protrusion 13122.

Similar to the embodiment shown in fig. 8, the contact point of the first protrusion 13121 and the first support column 13115 is located on one side of the projection of the axis of the fixed portion on the end face of the first support column 13115 near the fixed portion, and the contact point of the second protrusion 13122 and the first support column 13115 is located on the other side of the projection of the axis of the fixed portion on the end face of the first support column 13115 near the fixed portion.

Similar to the embodiment shown in fig. 8, it is assumed that there is a dividing surface that passes through the axis of the fixing portion and is perpendicular to the end face of the first support column 13115 near the fixing portion to divide the fixing portion into two parts. The contact point of the first protrusion 13121 and the first support column 13115 is located at one side of the division plane and the contact point of the second protrusion 13122 and the first support column 13115 is located at the other side of the division plane.

In some embodiments, referring to fig. 10, a third support column 13117 and a fourth support column 13118 are further disposed in the insulating base 1311, and the structures of the third support column 13117 and the fourth support column 13118 may refer to the related descriptions of the first support column 13115 or the second support column 13116, which are not described herein. The first support column 13115, the second support column 13116, the third support column 13117, and the fourth support column 13118 surround the outer circumference of the fixing portion, thereby restricting the metal plug from being shifted in the insulating base 1311, avoiding a change in the positional relationship among the first projection 13121, the second projection 13122, and the first support column 13115.

In some embodiments, the third support column 13117 and the fourth support column 13118 are perpendicular to the circuit board 120, and the first support column 13115 and the second support column 13116 are parallel to the circuit board 120.

It should be appreciated that in the foregoing embodiment, as in the embodiment shown in fig. 8 and 9, the insulating base 1311 may also be provided with a second support column 13116, where the second support column 13116 is disposed opposite to the limiting plate 13112, the limiting plane 13113, or the limiting groove 13114, so as to limit the movement of the positive metal plug 1312 in a direction away from the limiting plate 13112, the limiting plane 13113, or the limiting groove 13114, so as to avoid the change of the positional relationship between the limiting protrusion on the fixing portion and the limiting plate 13112, the limiting plane 13113, or the limiting groove 13114.

In the embodiment of the present application, the protruding portion formed on the circumferential surface of the fixing portion may also be referred to as a limit bump, and the limit plate 13112, the limit plane 13113, the limit groove 13114, and the first support column 13115 may be referred to as a limit structure formed on the inner wall of the insulating base 1311. The limiting structure formed on the inner wall of the insulating base 1311 is used for being engaged with the limiting protrusion formed on the peripheral surface of the fixing portion in the circumferential direction of the fixing portion, so as to limit the rotation of the metal plug connector relative to the insulating base 1311.

Fig. 11 is a schematic view of a structure of a metal plug according to an embodiment of the present application. As shown in fig. 11, the first and second protrusions 13121 and 13122 may also be spaced apart in the axial direction of the fixing portion, i.e., the first and second protrusions 13121 and 13122 are spaced apart a distance in the axial direction of the fixing portion.

Fig. 12 is a cross-sectional view of the photovoltaic connector shown in fig. 4 taken at A-A. As shown in fig. 12, a third protrusion 13123 may be further formed on the circumferential surface of the fixing portion of the positive metal plug 1312, where the third protrusion 13123 is located at a side of the fixing portion away from the limiting plate 13112, and the third protrusion 13123 abuts against an inner wall of the insulating base 1311 to limit the positive metal plug 1312 from moving in a direction away from the limiting plate 13112, so as to avoid a change in the engagement relationship between the first protrusion 13121, the second protrusion 13122 and the limiting plate 13112.

In some embodiments, third protrusion 13123 abuts an end (not shown) of second support post 13116 near positive metal plug 1312, thereby preventing positive metal plug 1312 from moving away from the limit feature.

The first protrusion 13121, the second protrusion 13122, and the third protrusion 13123 are located on one side of a portion where the inner diameter of the insulating base 1311 and the diameter of the fixing portion are equal.

Fig. 13 is a cross-sectional view of the photovoltaic connector shown in fig. 4 at C-C. As shown in fig. 13, the inner diameters of the insulating base 1311 may be different at different positions. At least a portion of the insulating base 1311 has the same or similar diameter as the fixed portion of the positive metal plug 1312 to limit the positive metal plug 1312 from shifting within the insulating base 1311, thereby avoiding a change in the positional relationship between the limit projection and the limit structure.

Referring to fig. 13, the positive metal plug 1312 may be inserted into the insulating base 1311 from an end of the insulating base 1311 located in the accommodation chamber defined by the housing 110, and at least part of the fixing portion of the positive metal plug 1312 passes through a portion where the inner diameter of the insulating base 1311 and the diameter of the fixing portion are equal. The positive metal plug 1312 further includes an elastic buckle 13126, and one end of the elastic buckle 13126, which is far away from the contact portion of the positive metal plug 1312, is fixed to the peripheral surface of the fixing portion of the positive metal plug 1312, and the other end is tilted.

The elastic buckle 13126 has elasticity, and the tilted portion of the elastic buckle 13126 may be pressed on the surface of the fixing portion, so that the fixing portion passes through the portion where the inner diameter of the insulating base 1311 is equal to the diameter of the fixing portion. After the elastic buckle 13126 passes through the portion where the inner diameter of the insulating base 1311 and the diameter of the fixing portion are equal, the end of the elastic buckle 13126, which is not fixed, is tilted and abuts against the portion where the inner diameter of the insulating base 1311 and the diameter of the fixing portion are equal.

In the embodiment of the present application, the portion where the inner diameter of the insulating base 1311 and the diameter of the fixing portion are equal is located between the elastic buckle 13126 and the third protrusion 13123. In this way, the elastic snap 13126 and the third projection 13123 catch the portion where the inner diameter of the insulating base 1311 and the diameter of the fixing portion are equal in the axial direction of the fixing portion, thereby restricting the axial movement of the positive metal plug 1312 along the insulating base, i.e., restricting the forward and backward movement of the positive metal plug 1312 within the insulating base, so as to avoid a change in the positional relationship between the limit projection formed on the peripheral surface of the fixing portion and the limit structure formed on the inner wall of the insulating base 1311.

In some embodiments, the first protrusion 13121 or the second protrusion 13122 abuts against the other side of the portion where the inner diameter of the insulating base 1311 and the diameter of the fixing portion are equal.

Fig. 14 is a schematic cross-sectional view of the photovoltaic connector shown in fig. 4 taken at B-B. Referring to fig. 5, 6 and 14, the contact portion of the positive metal plug 1312 is formed with a first projection structure 13124 and a second projection structure 13125 at both sides of the portion located within the insulating base 1311. The first and second protrusion structures 13124 and 13125 are wings on either side of a contact portion that has a greater width at the wings than at other locations. Correspondingly, two grooves are oppositely arranged on the inner wall of the insulating base 1311. When the positive metal plug 1312 extends into the insulator base 1311, the first projection arrangement 13124 and the second projection arrangement 13125 each insert into one of the recesses, thereby limiting rotation of the positive metal plug 1312 relative to the insulator base.

In some embodiments, the first and second protrusion structures 13124 and 13125 are flat sheet-like structures, the first and second protrusion structures 13124 and 13125 are parallel to the circuit board 120, and two grooves oppositely disposed on an inner wall of the insulating base 1311 are parallel to the circuit board 120.

In some embodiments, the contact portion of the positive metal plug 1312 may also include only one protruding structure, and corresponding to the protruding structure, only one groove may be disposed on the inner wall of the insulating base 1311, and when the positive metal plug 1312 extends into the insulating base 1311, the protruding structure is inserted into the groove, so as to achieve the effect of preventing the positive metal plug 1312 from rotating.

It should be appreciated that the first and second protrusion structures 13124 and 13125 formed on the contact portion are not different in nature from the first and second protrusions 13121 and 13122 formed on the circumferential surface of the fixing portion.

In the embodiment of the present application, the photovoltaic connector 130 may further include a negative connector 132, and the structure of the negative connector 132 may refer to the related description of the positive connector 131, which is not repeated herein, and only the differences will be described below.

Referring to fig. 4 and 7, upper plate bracket 140 may further include a negative electrode support column 142, negative connector 132 including a negative metal plug 1321, negative electrode support column 142 for supporting negative metal plug 1321. Specifically, a first portion of the contact portion of the negative metal plug 1321 is overlapped on the negative electrode support column 142 and is fixedly connected to the negative electrode support column 142.

In some embodiments, the difference in height of the positive electrode support column 141 and the negative electrode support column 142 is greater than or equal to a third preset value. In general, the height of the negative electrode support column 142 is smaller than the height of the positive electrode support column 141. In this way, the creepage distance between the positive metal plug 1312 of the positive connector 131 and the negative metal plug 1321 of the negative connector 132 is large, thereby improving the electrical stability of the photovoltaic inverter under high voltage conditions.

In the embodiment of the present application, since the electrical stability of the photovoltaic inverter needs to be ensured, the height of the negative electrode support column 142 is smaller than that of the circuit board 120, and the negative metal connector 1321 and the circuit board 120 are not directly electrically connected, but are electrically connected to the circuit board 120 through an additional metal connector (not shown in the drawing). That is, the photovoltaic connector 130 may further include a metal connector having one end connected to a first portion of the contact portion of the negative metal plug 1321 and the other end connected to the circuit board 120, so that the negative metal plug 1321 may be electrically connected to the circuit board 120 through the metal connector.

In some embodiments, the end of the metal connector that connects to the negative metal plug 1321, the first portion of the contact of the negative metal plug 1321, is fixedly connected to the side of the negative support post 142 that is adjacent to the circuit board 120. Thus, the metal connector and the negative metal plug 1321 are better in stability, and the electrical stability of the photovoltaic inverter is improved.

In this embodiment of the present application, the end where the metal connector and the negative metal connector 1321 are connected may also have a flat sheet structure, similar to the connection structure between the positive metal connector 1312 and the circuit board 120, if the negative metal connector 1321 rotates, the first portion of the contact portion of the negative metal connector 1321 and the metal connector cannot be attached, which may also cause poor contact and affect the electrical stability of the photovoltaic inverter. Therefore, the negative metal plug 1321 has a similar structure to the positive metal plug 1312, and includes a protrusion or a protrusion structure to limit the rotation of the metal plug, so as to reduce the difficulty of assembling the photovoltaic inverter, and avoid the damage of the metal plug caused by twisting.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (11)

1. A photovoltaic inverter, comprising:

the photovoltaic connector and the shell are used for accommodating the circuit board, and through holes are formed in the shell;

The photovoltaic connector comprises an insulating base and a metal plug connector, one end of the insulating base is positioned in the shell, the other end of the insulating base is positioned outside the shell, and the photovoltaic connector is fixed on the shell through the insulating base;

The insulation base is of a hollow tubular structure, the metal plug connector is wrapped in the insulation base and is a conductive metal conductor, the metal plug connector comprises an interface part, a fixing part and a contact part, the interface part is used for being connected with the photovoltaic module, the contact part is used for being connected with the circuit board, the fixing part is located between the interface part and the contact part, the fixing part is a cylindrical conductor, the fixing part is located in the insulation base, and the fixing part is used for fixing the metal plug connector and the insulation base;

The inner wall of the insulating base is provided with a limiting structure, the peripheral surface of the fixing part is provided with a limiting protrusion, and the limiting structure is used for clamping the limiting protrusion in the peripheral direction of the fixing part.

2. The photovoltaic inverter of claim 1, wherein the limit structure is plate-shaped, the limit structure is parallel to the axis of the fixed portion, at least one end of the limit structure is fixed to the inner wall of the insulating base, and a distance between the limit structure and the axis is greater than or equal to a radius of the fixed portion;

The limiting protrusion comprises a first protruding portion and a second protruding portion, the first protruding portion and the second protruding portion are respectively in contact with the limiting structure, and contacts of the first protruding portion, the second protruding portion and the limiting structure are located on two sides of projection of the axis on the limiting structure.

3. The photovoltaic inverter of claim 2 wherein the height of the first and second protrusions is greater than the shortest distance between the limit structure and the peripheral surface of the fixed portion.

4. The photovoltaic inverter of claim 1 wherein the limit structure is a groove formed on an inner wall of the insulating base into which the limit protrusion is inserted.

5. The photovoltaic inverter of claim 1, wherein the limit structure is a first support column formed on an inner wall of the insulating base, one end of the first support column is fixed to the inner wall of the insulating base, the other end of the first support column extends toward the metal plug, the limit protrusion includes a first protrusion and a second protrusion, the first protrusion and the second protrusion are in contact with the first support column, and at least a portion of the first support column is located between the first protrusion and the second protrusion.

6. The photovoltaic inverter of any of claims 1-5, wherein a second support column is further formed on an inner wall of the insulating base, the second support column and the limit structure are disposed opposite to each other, one end of the second support column is fixed to the inner wall of the insulating base, the other end of the second support column extends toward the metal plug, and the other end of the second support column abuts against a peripheral surface of the fixing portion.

7. The photovoltaic inverter of any of claims 1-5 wherein at least a portion of the insulating base has an inside diameter equal to a diameter of the stationary portion.

8. The photovoltaic inverter of claim 7, wherein the metal plug comprises an elastic buckle located at one side of the portion of equal diameter of the insulating base and the fixing portion, one end of the elastic buckle away from the portion of equal diameter of the insulating base and the fixing portion is fixed to the peripheral surface of the fixing portion, and the elastic buckle is tilted near one end of the portion of equal diameter of the insulating base and the fixing portion;

A third protruding portion is formed on the peripheral surface of the fixing portion, and the third protruding portion is located on the other side of the portion where the diameters of the insulating base and the fixing portion are equal.

9. The photovoltaic inverter of any of claims 1-5, wherein the contact portion of the metal plug is a sheet-like structure, the contact portion comprising a first portion, a second portion, and a third portion, the first portion being connected to the circuit board, the third portion being connected to the securing portion, the second portion being located between the first portion and the third portion, the second portion extending toward the circuit board such that the third portion conforms to the circuit board.

10. The photovoltaic inverter of claim 9 wherein the first portion of the contact is parallel to the circuit board.

11. The photovoltaic inverter of any of claims 1-5 wherein the portion of the contact within the insulating base comprises at least one raised structure, the insulating base further having at least one groove formed on an inner wall thereof, the at least one raised structure being inserted into the at least one groove.