Photovoltaic inverter

Abstract

The invention provides a photovoltaic inverter. The photovoltaic inverter comprises a shell, a main circuit board, a positive connector, a negative connector, an upper plate support and a convergence conductor. One end of the positive connector is connected between the upper plate support and the main circuit board, and one end of the negative connector is electrically connected with the main circuit board through the confluence conductor. The positive connector or the negative connector comprises an insulating base and a metal plug connector, one end of the insulating base is located in the shell, the other end of the insulating base is located outside the shell, and the positive connector or the negative connector is fixed to the shell through the insulating base. The insulating base is of a hollow tubular structure, the metal plug connector is wrapped in the insulating base, and the metal plug connector comprises an interface part, a fixing part and a contact part. The interface part is used for being connected with a photovoltaic module, the contact part is of a flat structure and is used for being connected with a main circuit board or a bus conductor in a stacked mode, and the fixing part is used for being mechanically fixed to an insulating base. Electric connection between the connector and the circuit board is achieved through the upper board support, installation procedures can be reduced, and connection reliability is improved.

Description

Photovoltaic inverter

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 22, 2023, with application number 202322594917.6 and application name “Photovoltaic Inverter”, the entire contents of which are incorporated by reference into this application.

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on September 22, 2023, with application number 202322610589.4 and application name “Photovoltaic Inverter”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of photovoltaic technology, and in particular to a photovoltaic inverter. Background Art

[0004] In a photovoltaic power generation system, the electrical energy from the photovoltaic modules needs to be transmitted to the photovoltaic inverter to achieve current inversion, ultimately allowing the electrical energy to enter the load or be connected to the power grid. A male connector can be installed on the photovoltaic module end, and a female connector can be installed on the photovoltaic inverter end. Once the male and female connectors are docked, the electrical connection between the photovoltaic module and the photovoltaic inverter is established. In actual use, at the photovoltaic inverter end, the conductive core of the connector is electrically connected to the circuit board inside the photovoltaic inverter via a cable. Because the cable must be electrically connected to both the conductive core and the circuit board, the installation process is relatively complicated and is prone to connection reliability issues.

[0005] In a photovoltaic power generation system, a photovoltaic inverter converts input DC power into AC power. The photovoltaic inverter includes a photovoltaic connector, one end of which needs to be connected to the circuit board. During installation, this metal connector can easily interfere with the upper bracket or circuit board, increasing assembly difficulty and potentially causing poor contact. Furthermore, the metal connector is easily damaged due to frequent plugging and unplugging of cables during use.

[0006] Summary of the Invention

[0007] The present application provides a photovoltaic inverter that realizes electrical connection between a photovoltaic connector and a circuit board through an upper board bracket, without the need for cables, which can reduce the installation process and improve connection reliability.

[0008] The present application provides a photovoltaic inverter, the photovoltaic connector of which has an anti-rotation structure to prevent the metal connector of the photovoltaic connector from rotating, which is beneficial to reducing the difficulty of installing the photovoltaic connector, thereby improving the assembly efficiency of the photovoltaic inverter, and is beneficial to preventing the photovoltaic connector from being twisted and damaged.

[0009] In a first aspect, a photovoltaic inverter is provided, which includes: a shell, a main circuit board, a positive connector, a negative connector, an upper plate bracket and a bus conductor, wherein: the shell includes a bottom shell and a cover plate, the bottom shell and the cover plate enclose a receiving chamber, the bottom shell includes a bottom plate arranged opposite to the cover plate, and a radiator is installed on the side of the bottom plate away from the cover plate; the main circuit board is located in the receiving chamber, the upper plate bracket is located between the bottom plate and the main circuit board and is fixed to the bottom plate; one end of the positive connector is connected between the upper plate bracket and the main circuit board, and one end of the negative connector is connected to the main circuit board through the bus conductor. The bus conductor is used to converge the currents of multiple negative inputs and transmit them to the main circuit board; the bus conductor includes a bus metal sheet and a transition metal sheet, the bus metal sheet is electrically connected to the multiple negative connectors, and the bus metal sheet is used to converge the currents transmitted by the multiple negative connectors; the transition metal sheet extends along a first direction, the first end of the transition metal sheet is fixedly connected to the bus metal sheet, the second end of the transition metal sheet is fixedly connected to the main circuit board, and the transition metal sheet is used to transmit the negative current obtained by merging the bus metal sheet to the main circuit board, and the first direction is perpendicular to the plane where the main circuit board is located.

[0010] In the photovoltaic inverter provided in the embodiment of the present application, the positive connector and the negative connector can be electrically connected to the main circuit board through the upper plate bracket, without the need for cables, thereby reducing the installation process and improving the connection reliability. Specifically, the positive connector is connected between the upper plate bracket and the main circuit board, and the negative connector is electrically connected to the main circuit board through a bus conductor, and the bus conductor can directly combine the currents in multiple circuits and then transfer them to the main circuit board, wherein the bus conductor may include a bus metal sheet and a transfer metal sheet, the bus metal sheet combines the currents transmitted by multiple negative connectors and transmits them to the transfer metal sheet, and the transfer metal sheet then transmits the combined current to the main circuit board, thereby realizing the transmission of current from the negative connector to the main circuit board. In this way, the number of separate upper plate conductors can be reduced, the loop length can be shortened, the contact thermal resistance and heat generation can be reduced, the transfer efficiency can be improved, and the cost of the entire machine can be reduced.

[0011] In combination with the first aspect, in certain implementations of the first aspect, the upper plate bracket includes a first type of support column, a second type of support column, and a base, the first type of support column and the second type of support column being alternately arranged in sequence along a second direction, the second direction being perpendicular to the first direction, and the base being fixed to the bottom plate; a first end of the first type of support column is fixed to the base, a second end of the first type of support column is connected to the main circuit board, and the second end of the first type of support column is an end away from the base; one end of the positive connector is connected between the second end of the first type of support column and the main circuit board; a first end of the second type of support column is fixed to the base, a second end of the second type of support column is connected to one end of the negative connector, and the second end of the second type of support column is an end away from the base; a height of the second type of support column along the first direction is less than a height of the first type of support column along the first direction, and a height difference between the second type of support column and the first type of support column along the first direction is greater than a first threshold; the bus metal sheet includes a plurality of bus terminals and a transfer terminal, the plurality of bus terminals are respectively electrically connected to the plurality of negative connectors, and the transfer terminal is fixedly connected to the transfer metal sheet.

[0012] It should be understood that the height of the second type of support column along the first direction is smaller than the height of the first type of support column along the first direction, and the height difference between the second type of support column and the first type of support column along the first direction is greater than a first threshold value, and the first direction is perpendicular to the plane where the main circuit board is located, so that the insulation distance between the first type of support column and the second type of support column meets certain requirements, avoiding problems such as discharge and short circuit.

[0013] In the photovoltaic inverter provided in the embodiment of the present application, the positive connector is connected between the first type of support column and the main circuit board, that is, it can be directly electrically connected to the main circuit board through the first type of support column; the negative connector is electrically connected to the main circuit board through the second type of support column and the bus conductor, and the bus conductor can directly combine the currents in multiple circuits and then transfer them to the main circuit board, thereby reducing the number of separate board conductors, shortening the loop length, reducing contact thermal resistance and heat generation, improving transfer efficiency, and reducing the cost of the entire machine.

[0014] Furthermore, by adopting a vertically staggered design for the first and second type support columns, such as connecting the positive connector of the positive electrode to the first type support column and the negative connector of the negative electrode to the second type support column, the spatial staggered design can reduce the overall volume of the upper plate bracket, laying the foundation for miniaturization of the entire device.

[0015] In one possible implementation, the first type of support column includes a plurality of first support parts, and the second type of support column includes a plurality of second support parts, the plurality of first support parts and the plurality of second support parts are alternately arranged in sequence along the second direction, the distance between the surface of the first support part facing away from the base plate and the base plate along the first direction is greater than the distance between the surface of the second support part facing away from the base plate and the base plate, one end of a portion of the plurality of photovoltaic connectors (i.e., a plurality of positive connectors) are respectively fixed to the surface of the plurality of first support parts facing away from the base plate, and one end of another portion of the plurality of photovoltaic connectors (i.e., a plurality of negative connectors) are respectively fixed to the surface of the plurality of second support parts facing away from the base plate.

[0016] In combination with the first aspect, in certain implementations of the first aspect, the bottom shell further includes a first side plate located between the bottom plate and the cover plate, the first side plate being perpendicular to the bottom plate and the cover plate, the positive connector and the negative connector being both fixed to the first side plate, along the first direction, the distance between the positive connector and the bottom plate being greater than the distance between the negative connector and the bottom plate, along the second direction, the positive connector and the negative connector are arranged alternately in sequence, and the second direction is parallel to the plane where the first side plate is located.

[0017] In combination with the first aspect, in certain implementations of the first aspect, the positive connector includes a first shell and a first terminal, the first shell is fixed to the outside of the first side plate, the first terminal is located in the first shell and extends into the interior of the shell, and is connected to the second end of the first type of support column; the negative connector includes a second shell and a second terminal, the second shell is fixed to the outside of the first side plate, the second terminal is located in the second shell and extends into the interior of the shell, and is connected to the second end of the second type of support column.

[0018] In the photovoltaic inverter provided in the embodiment of the present application, multiple positive connectors are fixed to the first type of support column, and multiple negative connectors are fixed to the second type of support column, so that the multiple positive connectors and the multiple negative connectors are arranged alternately in sequence along the second direction and staggered along the first direction, thereby reducing the mutual interference of the electrical connections between the multiple positive connectors and the multiple negative connectors, improving the stability of the electrical connection and making the overall local more regular.

[0019] In one possible implementation, the bus conductors may include multiple bus conductors, each used to transfer the current transmitted by the negative connector to the main circuit board. One of the multiple bus conductors may be connected to the second ends of at least two of the second-type support columns, thereby combining the currents to transmit multiple currents to the main circuit board. Alternatively, one of the multiple bus conductors may be connected to the second end of a single second-type support column, thereby transmitting a single current to the main circuit board without combining the currents.

[0020] In one possible implementation, the bus metal sheet includes multiple bus ends and adapter ends, the multiple bus ends are electrically connected to the multiple negative connectors respectively, the multiple bus ends are connected to the second ends of the second type support columns respectively, and the adapter ends are connected to the adapter metal sheet.

[0021] In this implementation, the busbar metal sheet may include a plurality of busbar ends and adapter ends, wherein the plurality of busbar ends may be electrically connected to a plurality of negative connectors, respectively. That is, the plurality of busbar ends may be respectively connected to the second end faces of the plurality of second-type support columns, and the plurality of negative connectors may be respectively connected to the second end faces of the plurality of second-type support columns, and therefore, the plurality of busbar ends may be electrically connected to the plurality of negative connectors, respectively. After the plurality of busbar ends of the busbar metal sheet are respectively electrically connected to the plurality of negative connectors, the current is combined, and after being combined into one path, the current is transmitted to the adapter metal sheet through the adapter end, and the adapter metal sheet transmits the combined current to the main circuit board. In this way, the number of separate upper board conductors can be reduced, the loop length can be shortened, the contact thermal resistance and heat generation can be reduced, and the transfer efficiency can be improved.

[0022] In combination with the first aspect, in certain implementations of the first aspect, the photovoltaic inverter further includes an integrated circuit board and electrical components, the integrated circuit board is fixed to the base and connected to the plurality of negative connectors, along the first direction, the integrated circuit board is located between the bus metal sheet and the main circuit board, along the third direction, the integrated circuit board is located on the side of the first type of support column away from the first side plate, and the third direction is perpendicular to the first direction and the second direction; the electrical components are used to implement at least one of DC filtering, surge protection, temperature detection and current detection functions, and the electrical components are fixed to the surface of the integrated circuit board facing the main circuit board.

[0023] It should be understood that functions such as DC filtering, surge protection, temperature detection, and current detection can be integrated into the integrated circuit board, depending on the size and integration level of the integrated circuit board. Generally, at least one of the functions of DC filtering, surge protection, temperature detection, and current detection can be integrated into the integrated circuit board, thereby reducing the size of the main circuit board, thereby reducing the size of the entire device and lowering costs.

[0024] In one possible implementation, the integrated circuit board includes a circuit board body and a connecting piece, one end of the connecting piece being electrically connected to the circuit board body, and the other end of the connecting piece being connected to the second end of the second type of support column and electrically connected to the negative connector. The connecting piece is made of a conductive metal.

[0025] It should be noted that the integrated circuit board can be electrically connected to the negative connector through the connecting piece, so that current can be transmitted to the integrated circuit board. At the same time, the connecting piece can also contact the bus conductor, and the bus conductor can contact the main circuit board, thereby forming a loop between the integrated circuit board and the main circuit board. The current can be transmitted to the integrated circuit board in the formed loop, so that DC filtering, temperature detection, current detection, etc. can be performed on the integrated circuit board.

[0026] In combination with the first aspect, in certain implementations of the first aspect, the upper board bracket also includes a clip, which is fixed on the surface of the base facing the main circuit board, and the clip is clamped on both sides of the integrated circuit board along the second direction to clamp the integrated circuit board and the bus metal sheet together.

[0027] In this implementation, a snap-fit ​​fixing method is used to fix the bus conductor and the integrated circuit board in a target area, thereby preventing the bus conductor and the integrated circuit board from moving.

[0028] In combination with the first aspect, in certain implementations of the first aspect, the photovoltaic inverter further includes a metal connecting plate, one end of the metal connecting plate is connected to the second end of the second type of support column, and the other end of the metal connecting plate is connected to the main circuit board, and the metal connecting plate is used to transmit the current input by one of the negative connectors to the main circuit board; the metal connecting plate includes an extension portion, a connecting portion and a fixing portion, the connecting portion is connected between the extension portion and the fixing portion, the extension portion is parallel to the fixing portion, and the extension portion extends along a third direction, and the third direction is perpendicular to the first direction and the second direction; the upper plate bracket further includes a clip, the clip is fixed to the surface of the base facing the main circuit board, and the clip is clamped on both sides of the extension portion along the second direction for clamping the metal connecting plate to the base.

[0029] In this implementation, a snap-fit ​​fixing method is adopted to fix the metal connecting piece to the target area of ​​the base, thereby preventing the metal connecting piece from moving.

[0030] In combination with the first aspect, in certain implementations of the first aspect, the upper plate bracket also includes a lap joint, which is fixedly connected to the first type of support column or the base, and the second end of the lap joint is connected to the main circuit board. The second end of the lap joint is the end away from the base, and the height difference between the second end of the lap joint and the second end of the first type of support column along the first direction is less than a second threshold; the second end of the transition metal sheet is connected between the main circuit board and the second end of the lap joint.

[0031] It should be understood that the height difference between the second end of the connecting piece and the second end of the first type of support column along the first direction is smaller than a second threshold value, so that the connecting piece can play a role in supporting the bus conductor.

[0032] In one possible implementation, along the first direction, the connector is located between the integrated circuit board and the main circuit board, the projection of the connector along the first direction partially overlaps with the projection of the integrated circuit board along the first direction, and along the third direction, the distance between the connector and the first side panel is greater than the distance between the first type of support column and the first side panel, and the connector is fixedly connected to the first type of support column.

[0033] In one possible implementation, the first end of the connector is fixedly connected to the base, the second end of the connector is connected to the main circuit board, and one end of the bus conductor can be connected between the main circuit board and the second end of the connector, that is, the bus conductor is stuck between the connector and the main circuit board.

[0034] In another possible implementation, the connector is suspended and the side of the connector is fixedly connected to the side of the first type of support column, the second end of the connector is connected to the main circuit board, and one end of the bus conductor can be connected between the main circuit board and the second end of the connector.

[0035] It should be understood that the main circuit board has a through-hole, and the end of the bus conductor connected to the main circuit board is also provided with a through-hole, and the projections of the through-holes on the main circuit board and the through-holes on the bus conductor along the first direction overlap. The screw can pass through the through-holes on the main circuit board and the through-holes on the bus conductor and be screwed onto the second end of the bridge piece. In other words, the screw can pass through the through-holes on the main circuit board and the through-holes on the bus conductor to be fixedly connected to the bridge piece.

[0036] In combination with the first aspect, in certain implementations of the first aspect, the main circuit board includes a front side of the circuit board and a back side of the circuit board arranged opposite to each other along the first direction, the front side of the circuit board faces the cover plate, and the back side of the circuit board faces the base plate. The main circuit board divides the accommodating chamber into a first accommodating chamber and a second accommodating chamber. The first accommodating chamber is located between the front side of the main circuit board and the cover plate, and the second accommodating chamber is located between the back side of the circuit board and the base plate. The volume of the first accommodating chamber is smaller than the volume of the second accommodating chamber so as to accommodate the first device and the second device respectively; wherein the working heat generation of the second device is greater than the working heat generation of the first device, or the length of the second device along the first direction is greater than the length of the first device along the first direction, the first device includes a chip resistor, a chip capacitor and an indicator light fixed to the front side of the circuit board, and the second device includes an inverter power component, a bus capacitor and an inductor fixed to the back side of the circuit board.

[0037] It should be understood that placing the main circuit board, the upper plate bracket and the electronic components in the receiving chamber can, on the one hand, protect the main circuit board, the upper plate bracket and the electronic components, and on the other hand, effectively utilize the cavity space to avoid the cavity being too large, thereby improving space utilization and reducing costs. The second component can be thermally connected to the heat sink fins through the bottom plate, which is conducive to shortening the heat transfer path and improving the heat dissipation effect.

[0038] It is understandable that the height of the electronic device (i.e., the second device) contained in the second accommodating cavity is higher than the height of the electronic device (i.e., the first device) contained in the first accommodating cavity. For example, the height of the second device is less than or equal to 9 cm, and the height of the first device is less than or equal to 5 mm. In other words, the second accommodating cavity can accommodate electronic devices with high height, large volume, and high heat dissipation requirements, such as inverter power components, busbar capacitors and inductors, etc.; the first accommodating cavity can accommodate electronic devices with low height, small volume, and low heat dissipation requirements, such as chip capacitors, chip resistors, indicator lights, etc.

[0039] In combination with the first aspect, in certain implementations of the first aspect, the other end of the positive connector is connected to the positive electrode of the photovoltaic module, and the other end of the negative connector is connected to the negative electrode of the photovoltaic module.

[0040] In combination with the first aspect, in certain implementations of the first aspect, the other end of the positive connector is connected to the positive electrode of the external energy storage device, and the other end of the negative connector is connected to the negative electrode of the external energy storage device.

[0041] In combination with the first aspect, in certain implementations of the first aspect, the other ends of some of the multiple positive connectors are connected to the positive pole of the photovoltaic module, the other ends of some of the multiple negative connectors are connected to the negative pole of the photovoltaic module, the other ends of another part of the multiple positive connectors are connected to the positive pole of the external energy storage device, and the other ends of another part of the multiple negative connectors are connected to the negative pole of the external energy storage device.

[0042] In combination with the first aspect, in certain implementations of the first aspect, a fixed installation hole is provided on the base, and the base is fixedly connected to the housing through the fixed installation hole.

[0043] In this implementation, the upper plate bracket can be fixed to the outer shell through the fixed mounting hole on the base to avoid direct connection to the main circuit board, thereby reducing the strength and stress risk of the main circuit board and increasing the connection stability of the upper plate bracket.

[0044] In combination with the first aspect, in certain implementations of the first aspect, the first type of support column, the second type of support column and the connecting member can all be hollow structures.

[0045] In this implementation, by making the first type of support column, the second type of support column and the connecting member adopt a hollow structure, that is, the upper plate bracket adopts a hollow design, the weight of the upper plate bracket can be reduced and the cost can be reduced.

[0046] In combination with the first aspect, in certain implementations of the first aspect, the first type of support column, the second type of support column, the base and the connecting member are an integrally formed structure.

[0047] In a possible implementation, the first type of support column, the second type of support column, and the base are an integrally formed structure.

[0048] In combination with the first aspect, in certain implementations of the first aspect, the first type of support column, the second type of support column, the base and the connecting member can all be made of insulating materials to prevent electrical conduction.

[0049] In a second aspect, a photovoltaic inverter is provided, comprising: a photovoltaic connector and a shell for accommodating a circuit board, the shell being formed with a through hole; the photovoltaic connector comprising an insulating base and a metal plug, one end of the insulating base being located inside the shell, and the other end of the insulating base being located outside the shell, the photovoltaic connector being fixed to the shell through the insulating base; the insulating base being a hollow tubular structure, the metal plug being wrapped inside the insulating base, the metal plug comprising an interface portion, a fixing portion and a contact portion, the interface portion being used to connect to a photovoltaic component, the contact portion being used to connect to the circuit board, the fixing portion being located between the interface portion and the contact portion, the fixing portion being a cylindrical conductor, the fixing portion being located inside the insulating base, and the fixing portion being used to fix the metal plug to the insulating base; a limiting structure is formed on the inner wall of the insulating base, a limiting protrusion is formed on the circumferential surface of the fixing portion, and the limiting structure is used to engage the limiting protrusion in the circumferential direction of the fixing portion.

[0050] In the embodiment of the present application, a limiting structure is formed on the inner wall of the insulating base, and a corresponding limiting protrusion is formed on the fixed portion of the metal connector. The limiting structure and the limiting protrusion engage together in the circumferential direction of the fixed portion, thereby preventing the metal connector from rotating relative to the insulating base. The metal connector can be fixed at a suitable angle, facilitating the connection between the metal connector and the circuit board, thereby reducing the difficulty of assembling the photovoltaic connector. At the same time, the connecting portion of the metal connector and the circuit board can be tightly attached to the circuit board, thereby preventing poor contact. In addition, because the metal connector cannot rotate relative to the insulating base, it helps to prevent the metal connector from twisting and being damaged due to repeated plugging and unplugging of cables.

[0051] In combination with the second aspect, in a possible implementation, the limiting structure is plate-shaped, the limiting structure is parallel to the axis of the fixing part, at least one end of the limiting structure is fixed to the inner wall of the insulating base, and the distance between the limiting structure and the axis is greater than or equal to the radius of the fixing part; the limiting protrusion includes a first protrusion and a second protrusion, the first protrusion and the second protrusion are respectively in contact with the limiting structure, and the contact points of the first protrusion and the second protrusion with the limiting structure are located on both sides of the projection of the axis on the limiting structure.

[0052] In combination with the second aspect, in a possible implementation, the height of the first protrusion and the second protrusion is greater than the shortest distance between the limiting structure and the circumference of the fixing portion.

[0053] In combination with the second aspect, in a possible implementation, the limiting structure is a groove formed on the inner wall of the insulating base, and the limiting protrusion is inserted into the groove.

[0054] In combination with the second aspect, in a possible implementation, the limiting structure is a first support column formed on the inner wall of the insulating base, one end of the first support column is fixed to the inner wall of the insulating base, and the other end of the first support column extends toward the metal connector, and the limiting 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.

[0055] In combination with the second aspect, in a possible implementation, a second support column is formed on the inner wall of the insulating base, the second support column and the limiting structure are arranged 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 connector, and the other end of the second support column is against the peripheral surface of the fixed part.

[0056] In combination with the second aspect, in a possible implementation, an inner diameter of at least a portion of the insulating base is equal to a diameter of the fixing portion.

[0057] In the embodiment of the present application, the metal connector cannot move in a direction away from the limiting structure, thereby preventing the positional relationship between the limiting protrusion and the limiting structure from changing.

[0058] In combination with the second aspect, in a possible implementation, the positive metal connector includes an elastic clip, which is located on one side of the portion where the insulating base and the fixed portion have equal diameters, and the end of the elastic clip away from the portion where the insulating base and the fixed portion have equal diameters is fixed to the circumferential surface of the fixed portion, and the end of the elastic clip close to the portion where the insulating base and the fixed portion have equal diameters is tilted; a third protrusion is formed on the circumferential surface of the fixed portion, and the third protrusion is located on the other side of the portion where the insulating base and the fixed portion have equal diameters.

[0059] In an embodiment of the present application, the elastic clip and the third protrusion engage with the insulating base and the portion with equal diameter of the fixing portion in the axial direction of the fixing portion, thereby limiting the axial movement of the metal connector along the fixing portion, thereby avoiding a change in the positional relationship between the limiting protrusion and the limiting structure.

[0060] In combination with the second aspect, in a possible implementation, the contact portion of the metal connector is a sheet-like structure, and the contact portion includes a first part, a second part and a third part, the first part is connected to the circuit board, the third part is connected to the fixing part, the second part is located between the first part and the third part, and the second part extends toward the circuit board so that the third part fits the circuit board.

[0061] In the embodiment of the present application, the contact portion of the metal connector can be bent so that the first portion of the contact portion fits on the circuit board, thereby facilitating the connection between the first portion of the contact portion and the circuit board.

[0062] In combination with the second aspect, in a possible implementation manner, the first portion of the contact portion is parallel to the circuit board.

[0063] In an embodiment of the present application, the contact portion is a sheet-like structure, and based on the structure of the above-mentioned photovoltaic connector, the metal connector cannot rotate inside the insulating base, and the first part of the contact portion is parallel to the circuit board, so that the first part of the contact portion can fit tightly on the circuit board, thereby avoiding poor contact.

[0064] In combination with the second aspect, in a possible implementation, the portion of the contact portion located within the insulating base includes at least one protruding structure, and at least one groove is provided on the inner wall of the insulating base, and the at least one protruding structure is inserted into the at least one groove.

[0065] In the embodiment of the present application, the protruding structure on the contact portion and the groove on the inner wall of the insulating base are cooperated to further restrict the rotation of the metal connector relative to the insulating base, which is beneficial to reducing the installation difficulty of the photovoltaic connector, improving the assembly efficiency of the photovoltaic inverter, and avoiding twisting and damage of the photovoltaic connector.

[0066] In a third aspect, the present application provides a photovoltaic inverter, which includes: a shell, a main circuit board, a photovoltaic connector, an upper plate bracket and a bus conductor, wherein the photovoltaic connector includes a positive connector and a negative connector, wherein: the shell includes a bottom shell and a cover plate, the bottom shell and the cover plate enclose a receiving chamber, the bottom shell includes a bottom plate arranged opposite to the cover plate, and a radiator is installed on the side of the bottom plate away from the cover plate; the main circuit board is located in the receiving chamber, the upper plate bracket is located between the bottom plate and the main circuit board and is fixed to the bottom plate; one end of the positive connector is connected between the upper plate bracket and the main circuit board and is electrically connected to the main circuit board, and one end of the negative connector is electrically connected to the main circuit board through the bus conductor, and the The bus conductor is used to converge the currents of multiple negative pole inputs and transmit them to the main circuit board; the photovoltaic connector includes an insulating base and a metal connector, one end of the insulating base is located inside the shell, and the other end of the insulating base is located outside the shell, and the photovoltaic connector is fixed to the shell through the insulating base; the insulating base is a hollow tubular structure, and the metal connector is wrapped in the insulating base. The metal connector is a conductive metal conductor, and the metal connector includes an interface part, a fixing part and a contact part. The interface part is used to be connected to the photovoltaic component, and the contact part is a flat sheet structure. The contact part is used to be laminated and connected to the main circuit board or the bus conductor, and the fixing part is used to be mechanically fixed to the insulating base.

[0067] In the photovoltaic inverter provided in the embodiment of the present application, the positive connector and the negative connector can be electrically connected to the main circuit board through the upper board bracket, without the use of cables, which can reduce the installation process and improve the connection reliability. In addition, a bus conductor is used to converge the current input by the negative connector outside the circuit board, which can reduce the number of ports on the circuit board, shorten the loop length, reduce the contact thermal resistance and heat generation, improve the switching efficiency, and reduce the cost of the whole machine. The contact part of the metal connector is a sheet structure and is stacked and connected with the main circuit board or the bus conductor, which can increase the contact area between the contact part and the main circuit board or the bus conductor, shorten the conductive path, and thus improve the cost of the whole machine. It has high conductive performance, and the main circuit board is located in the receiving chamber enclosed by the bottom shell and the cover plate, and the upper plate bracket and the bus conductor are located between the main circuit board and the bottom plate. Therefore, during the production process, the upper plate bracket, the bus conductor and the photovoltaic connector can be fixed to the shell first, and then the main circuit board can be placed in the receiving chamber for fixation. Basically, the electrical connection process of all photovoltaic connectors and the main circuit board can be completed at one time, eliminating the tedious connection of the photovoltaic connector and the main circuit board cable during manual connection and the possibility of wiring errors. This solution greatly simplifies the production process, improves production efficiency, and basically eliminates the possibility of wiring failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] FIG1 is a schematic diagram of a photovoltaic power generation system provided in an embodiment of the present application.

[0069] FIG2 is a schematic diagram of a circuit structure of a photovoltaic inverter provided in an embodiment of the present application.

[0070] FIG3 is a schematic diagram of the structure of a photovoltaic inverter provided in an embodiment of the present application.

[0071] FIG4 is a schematic diagram of the structure of a photovoltaic inverter provided in an embodiment of the present application.

[0072] FIG5 is a schematic diagram of the structure of a photovoltaic connector provided in an embodiment of the present application.

[0073] FIG6 is a schematic structural diagram of a metal connector of a photovoltaic connector provided in an embodiment of the present application.

[0074] FIG7 is a schematic diagram of a connection between a metal connector and a circuit board provided in an embodiment of the present application.

[0075] FIG8 is a cross-sectional schematic diagram of a photovoltaic connector provided in an embodiment of the present application.

[0076] FIG9 is a cross-sectional schematic diagram of another photovoltaic connector provided in an embodiment of the present application.

[0077] FIG10 is a cross-sectional schematic diagram of another photovoltaic connector provided in an embodiment of the present application.

[0078] FIG11 is a cross-sectional view of a photovoltaic connector provided in an embodiment of the present application.

[0079] FIG12 is a cross-sectional view of another photovoltaic connector provided in an embodiment of the present application.

[0080] FIG13 is a schematic structural diagram of a metal connector of a photovoltaic connector provided in an embodiment of the present application.

[0081] FIG14 is a cross-sectional schematic diagram of a photovoltaic connector provided in an embodiment of the present application.

[0082] FIG15 is a schematic diagram showing the connection between the photovoltaic module and the photovoltaic inverter shown in FIG1 .

[0083] FIG16 is a three-dimensional structural diagram of some components of a photovoltaic inverter provided in an embodiment of the present application.

[0084] FIG17 is a three-dimensional structural diagram of an upper plate bracket provided in an embodiment of the present application.

[0085] FIG18 is a three-dimensional structural diagram of a bus conductor and an integrated circuit board provided in an embodiment of the present application. DETAILED DESCRIPTION

[0086] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0087] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in this article is merely a way to describe the association relationship of associated objects, indicating that three relationships can exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0088] 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. In the embodiments of the present application, the use of prefixes such as ordinal numbers to distinguish description objects 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, the meaning of "plurality" is two or more.

[0089] The terms "up", "down", "left", "right", "front", "back", "top", "bottom", "inside", "outside", etc. in the embodiments of the present application indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present application.

[0090] References to "some embodiments" and the like in this specification mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in some embodiments" and the like that appear in different places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0091] The “perpendicular” mentioned in this application is not strictly perpendicular, but within the allowable error range. The “parallel” is not strictly parallel, but within the allowable error range.

[0092] In the embodiments of this application, the same reference numerals represent the same component or part. In the embodiments of this application, for multiple identical parts, only one of the parts may be labeled with a reference numeral in the drawings as an example. The same reference numerals apply to other identical parts or components. In addition, the sizes and dimensions of the parts shown in the drawings are for illustrative purposes only.

[0093] The photovoltaic power generation system provided in the embodiment of the present application will be described in detail below with reference to FIG1 .

[0094] FIG1 is a schematic diagram of a photovoltaic power generation system according to an embodiment of the present application. As shown in FIG1 , the photovoltaic power generation system may include: a photovoltaic module 10 , a photovoltaic inverter 20 , and an energy storage system 30 .

[0095] Optionally, the photovoltaic power generation system may further include: a power grid 40 and a load 50 .

[0096] Specifically, the photovoltaic inverter 20 can convert the direct current from the photovoltaic assembly 10 into alternating current, and transmit the alternating current to the grid 40 or the load 50. The photovoltaic inverter 20 can transmit the direct current from the photovoltaic assembly 10 to the energy storage system 30 to charge the energy storage system 30. The photovoltaic inverter 20 can convert the direct current from the energy storage system 30 into alternating current, and transmit the alternating current to the grid 40 or the load 50.

[0097] It can be understood that when the photovoltaic power generation system includes a photovoltaic module 10, a photovoltaic inverter 20, and an 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 can be charged. When the photovoltaic power generation system includes a photovoltaic module 10, a photovoltaic inverter 20, an energy storage system 30, a power grid 40, and a 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 to the energy storage system 30; the photovoltaic inverter 20 connects the photovoltaic module 10 to 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 to the energy storage system 30, etc.

[0098] The energy storage system 30 in the photovoltaic power generation system can store and release electrical energy. For example, the energy storage system 30 can store DC power from the photovoltaic modules 10 and supply power to the power grid 40 or the load 50 via the photovoltaic inverter 20. Therefore, the energy storage system 30 has a wide range of application scenarios, including but not limited to household applications, industrial green power applications, and smart photovoltaic power station applications.

[0099] As can be seen from the above description, the photovoltaic inverter 20 is a converter that can convert direct current into alternating current. Exemplarily, 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, DC port 1 is used to connect the photovoltaic module 10, and DC port 2 is used to connect the energy storage system 30. The AC port can be used to connect to the power grid 40 or the load 50.

[0100] The PV module 10 can feed power to the grid 40 and supply power to the load 50 via the DC port 1. The energy storage system 30 can supply power to the load 50 via the DC port 2. The grid 40 can supply power to the load 50 via the AC port. In other words, the PV inverter 20 serves as a connection hub between the load 50 and the energy module (which may include the PV module 10, the energy storage system 30, and the grid 40).

[0101] FIG2 is a schematic diagram of a circuit structure of a photovoltaic inverter provided in an embodiment of the present application.

[0102] Referring to Figure 2, in a photovoltaic power generation system, a photovoltaic inverter includes components such as a rotary switch, a photovoltaic connector, and an AC connector. The photovoltaic connector (PV connector) is used to input the direct current (DC) generated by the photovoltaic module using light energy; the rotary switch primarily switches the current; the inverter circuit (DC / AC circuit) converts DC power to AC power, and the DC / DC circuit converts one voltage level to another in the DC circuit; the AC connector transmits the AC power to the grid and / or load.

[0103] It should be noted that the DC / AC and DC / DC circuits are located on the PV inverter's circuit board. Components such as the PV inverter's rotary switch, PV connector, signal connector, and AC connector are all directly connected to the circuit board and interconnected via metal traces on the circuit board, forming the circuit structure shown in Figure 2. This eliminates the need for cables to connect the rotary switch, PV connector, AC connector, and circuit board, improving the space utilization of the PV inverter.

[0104] In the embodiment shown in Figure 2, the rotary switch is a multi-pole switch. A multi-pole switch includes multiple disconnect units, each corresponding to a pole of the multi-pole switch. This means the multi-pole switch can disconnect multiple circuits simultaneously. More specifically, in this embodiment, the rotary switch includes four disconnect units, three of which are connected to the PV+ and one to the PV-. The side of the rotary switch connected to the PV can be referred to as the input side of the rotary switch, and the side of the rotary switch connected to the DC / DC circuit can be referred to as the output side of the rotary switch. A set of PVs (a combination of one PV+ and one PV-) can be referred to as a PV string. In this embodiment, three PV strings are connected to the input side of the rotary switch, with the PV+ of each string connected to a disconnect unit of the rotary switch. The PV- of each string is then combined and connected to a disconnect unit of the rotary switch.

[0105] It should be understood that in order to realize the function of the photovoltaic inverter, the circuit board may also include other circuits, 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.

[0106] 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 connections of the electronic components. Generally, a printed circuit board without soldered electronic components may be referred to as a PCB. 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.

[0107] FIG3 is a schematic diagram of the structure of a photovoltaic inverter 100 provided in an embodiment of the present application. FIG4 is a schematic diagram of the structure of a photovoltaic inverter 100 provided in an embodiment of the present application. The photovoltaic inverter 100 shown in FIG3 and FIG4 can be an exemplary structure of the photovoltaic inverter 20 shown in FIG1.

[0108] 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, which may enclose a receiving cavity, wherein the top plate and the bottom plate of the housing 110 are disposed opposite each other.

[0109] The circuit board 120 is located in the housing cavity enclosed by the housing 110, and the circuit board 120 divides the housing cavity enclosed by the housing 110 into a first chamber and a second chamber. The first chamber is the housing space enclosed by the bottom plate of the housing 110, the side plates of the housing 110, and the circuit board 120, while the second chamber is the housing space enclosed by the top plate of the housing 110, the side plates of the housing 110, and the circuit board 120. Furthermore, 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.

[0110] In some embodiments, the circuit board 120 is parallel to the bottom plate and / or top plate of the housing 110 .

[0111] In the embodiment of the present application, conductive patterns or metal traces are provided on both sides of the circuit board 120, and electrical components are mounted on both sides of the circuit board 120. Specifically, some of the electrical components are located in the first chamber and connected to the side of the circuit board 120 that is close to the bottom plate of the housing 110; another portion of the electrical components are located in the second chamber and connected to the side of the circuit board 120 that is close to the top plate of the housing 110.

[0112] Specifically, the first chamber can be used to accommodate some electrical components that are larger in size, higher in height or higher in power, such as large electrical components such as power inductors, bus capacitors, power modules and switching tubes. The second chamber can be used to accommodate some electrical components that are smaller in size, lower in height or lower in power, such as small electrical components such as chip capacitors, chip resistors, indicator lights, etc. The first chamber is used to accommodate electrical components whose height is greater than or equal to the first preset value, and the second chamber is used to accommodate electrical components whose height is less than or equal to the second preset value, and the first preset value is greater than the second preset value. That is, the height of the electrical components connected to the side of the circuit board close to the bottom plate is greater than or equal to the first preset value, and the height of the electrical components connected to the side of the circuit board close to the top plate is less than or equal to the second preset value. The first preset value and the second preset value can be pre-set by a technician, for example, the first preset value can be approximately 9 mm, and the second preset value can be approximately 5 mm.

[0113] In some embodiments, the photovoltaic inverter 100 may further include a heat sink connected to the side of the bottom plate of the housing 110 away from the circuit board 120. This improves heat dissipation for the electrical components in the first chamber. Large electrical components have high power and generate a lot of heat. Mounting these large electrical components on the side of the circuit board 120 closer to the bottom plate of the housing 110 helps improve the heat dissipation of the photovoltaic inverter.

[0114] The first cavity can also accommodate smaller, lower-height electrical components, such as small but high-heat-generating electrical components. Specifically, the height of the electrical components connected to the side of the circuit board 120 near the base plate can also be less than the first predetermined value. However, due to the height restrictions of the first and second cavities, the first and second cavities cannot accommodate electrical components exceeding the height restrictions.

[0115] 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 photovoltaic inverter and enhance the heat dissipation effect of the photovoltaic inverter.

[0116] In a 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. The connector is then connected to the DC / DC circuit or DC / AC circuit via metal traces on the circuit board 120, thereby inputting the direct current generated by the photovoltaic module using light energy. The photovoltaic connector 130 may include multiple positive connectors and multiple negative connectors. The positive connector is the connector that connects to the positive pole of the photovoltaic module, and the negative connector is the connector that connects to the negative pole of the photovoltaic module. The multiple positive connectors and the multiple negative connectors correspond one-to-one, and the corresponding positive connectors and negative connectors are connected to the same photovoltaic module.

[0117] 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 extend into the first chamber through one of the through holes and connect to the circuit board 120.

[0118] It should be understood that the photovoltaic connector 130 may include multiple positive connectors and multiple negative connectors, which is not limited in this embodiment of the present application.

[0119] The following description uses the positive connector 131 as an example. Figure 5 is a schematic diagram of the structure of a photovoltaic connector provided in an embodiment of the present application. Figure 6 is a schematic diagram of the structure of a metal connector of a photovoltaic connector provided in an embodiment of the present application. Figure 7 is a schematic diagram of the connection between a metal connector and a circuit board provided in an embodiment of the present application.

[0120] 4 and 5 , the positive connector 131 includes an insulating base 1311 and a positive metal plug 1312. The insulating base 1311 extends into the first chamber through the first through hole 111 on the side wall of the housing 110, and the insulating base 1311 and the housing 110 are fixedly connected.

[0121] In the present application, specific methods of fixed connection include, but are not limited to, one or more of the following: bonding, welding, threaded fastening connection, clamping, and riveting.

[0122] Illustratively, the diameter of the portion of the insulating base 1311 located outside the shell 110 is larger than the diameter of the first through hole 111, and a thread is provided on the outer peripheral wall of the portion of the insulating base 1311 located in the accommodating cavity surrounded by the shell 110, so that the insulating base 1311 can be fixedly connected to the shell 110 by a threaded fastening connection.

[0123] It should be noted that each photovoltaic connector includes an insulating base and a metal plug-in component, and each photovoltaic connector may correspond to a through hole on the housing 110 .

[0124] It should be noted that the insulating base can be understood as a component of the photovoltaic connector, or it can also be understood as a component of the shell 110. When the insulating base is a component of the shell 110, the insulating base and the shell 110 can be an integral structure, or can also be a separate structure, which is not limited in this embodiment of the present application. When the insulating base and the shell 110 are separate structures, the insulating base and the shell 110 are two different components, which can be assembled together by snapping, snapping, screws, bolts, etc., and can be separated when disassembly is required. When the insulating base and the shell 110 are an integral structure, the connection between the insulating base and the shell 110 cannot be separated. For example, the insulating base and the shell 110 can be processed and manufactured in an integral molding manner, and the insulating base is a part of the shell 110; for another example, the insulating base and the shell 110 can be assembled by riveting or other connection methods.

[0125] The insulating base 1311 is a hollow tubular structure. As shown in FIG. 4 and FIG. 5 , the insulating base 1311 can communicate with the external space of the shell 110 and the accommodating cavity surrounded by the shell 110 .

[0126] In an example, the insulating base 1311 is provided with a second through hole 13111 , and the second through hole 13111 can connect the external space of the shell 110 and the accommodating cavity surrounded by the shell 110 .

[0127] In the embodiment of the present application, the positive metal connector 1312 extends through the insulating base 1311 into the first chamber of the housing 110 and is connected to a side of the circuit board 120 close to the bottom plate of the housing 110 .

[0128] Referring to Figures 4 to 6 , the positive metal connector 1312 includes an interface portion, a fixing portion, and a contact portion. The interface portion is used to connect to the photovoltaic module; the contact portion is used to connect to the circuit board 120; and the fixing portion is located between the interface portion and the contact portion, with one end of the fixing portion connected to the interface portion and the other end connected to the contact portion.

[0129] Referring to Figure 6 , the contact portion may include a first portion, a second portion, and a third portion. The first portion of the contact portion connects the positive metal connector 1312 to the circuit board 120; the third portion of the contact portion connects to the fixing portion; and the second portion of the contact portion is located between the first and third portions, with one end of the second portion connected to the first portion and the other end connected to the third portion.

[0130] In this embodiment of the present application, the contact portion is a sheet-like structure; the interface portion and the fixed portion are cylindrical structures, or alternatively, hollow cylindrical structures. The interface portion, fixed portion, and third portion of the contact portion of the positive metal connector 1312 are located within the insulating base, while the first and second portions of the contact portion are located outside the insulating base 1311.

[0131] Continuing with FIG6 , the contact portion has a Z-shaped structure. The first and third portions of the contact portion may be parallel to the circuit board 120, while the second portion of the contact portion may be perpendicular to the circuit board 120. It is understood that the contact portion may be bent to be closer to the circuit board 120. Specifically, the contact portion is bent at the junction of the second and third portions, and at the junction of the first and second portions, 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 in contact with each other.

[0132] In some embodiments, the third portion of the contact portion may not be located in the insulating base 1311 , or only a portion of the third portion of the contact portion is located in the insulating base 1311 .

[0133] 4 and 7 , the photovoltaic inverter 100 may further include an upper plate bracket 140 . The upper plate bracket 140 is located in the first cavity and is fixedly connected to the bottom plate of the housing 110 .

[0134] It should be noted that the upper plate bracket is made of insulating material, such as plastic.

[0135] The upper plate bracket 140 is used to support the portion connecting the positive metal connector 1312 and the circuit board 120 (i.e., the first portion of the contact portion). Specifically, the upper plate bracket 140 may include a positive support column 141. The first portion of the contact portion of the positive metal connector 1312 overlaps the side of the positive support column 141 close to the circuit board 120. 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 connector 1312 is attached to the side of the circuit board 120 close to 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 connector 1312, and the positive support column 141 are stacked, with the first portion of the contact portion located between the positive support column 141 and the circuit board 120. This improves the stability of the connection between the positive metal connector 1312 and the circuit board 120 and prevents poor contact.

[0136] 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 close to the circuit board 120 and the bottom plate of the housing 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 close to the bottom plate of the housing 110) and the bottom plate of the housing 110.

[0137] There are many ways to fix or electrically connect the circuit board 120 and the first part of the contact portion. For example, referring to Figure 7, the first part of the contact portion and the circuit board 120 include two through holes arranged opposite to each other. At the same time, a blind hole is provided at one end of the positive electrode support column 141 close to the circuit board 120, and a nut is provided in the blind hole. A metal screw is used to pass through the two oppositely arranged through holes and extend into the blind hole of the positive electrode support column 141, and is connected to the metal nut by threading. In this way, the first part of the contact portion and the circuit board 120 are fixedly connected together, and the first part of the contact portion and the metal traces on the circuit board 120 are electrically connected.

[0138] In some embodiments, the metal nut disposed in the blind hole and the positive electrode support column 141 can be snapped together. The metal nut cannot rotate in the blind hole, but the metal nut can move in a direction perpendicular to the circuit board 120. When the screw is tightened, the nut is forced to move toward the circuit board 120, thereby tightly pressing the first portion of the contact portion against the circuit board 120.

[0139] During the actual assembly process, the insulating base 1311 is first inserted into the first through hole 111 of the shell 110 and fixedly connected to the shell 110; then the positive metal connector 1312 is inserted into the insulating base 1311; then the positive support column 141 of the upper plate bracket 140 is pushed under the first part of the contact portion of the positive metal connector 1312, so that the first part of the contact portion fits on the circuit board 120; finally, the circuit board 120 and the first part of the contact portion are connected.

[0140] If positive metal connector 1312 rotates, the first portion of the contact portion will not be parallel to circuit board 120 and will not be able to mate with the circuit board 120, making it more difficult to install the photovoltaic inverter and potentially causing poor contact. Furthermore, during actual use, users may frequently plug and unplug cables, causing positive metal connector 1312 to rotate, twisting the contact portion and causing it to break.

[0141] In an 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 circumferential surface of the fixed portion of the positive metal connector 1312. The limiting structure is used to engage with the limiting protrusion in the circumferential direction of the fixed portion, thereby preventing the positive metal connector 1312 from rotating in the insulating base 1311.

[0142] The limiting structure formed on the inner wall of the insulating base 1311 and the limiting protrusions formed on the peripheral surface of the fixing portion of the positive metal connector 1312 are described in detail below with reference to the accompanying drawings.

[0143] The positive metal connector 1312 of the positive connector and the negative metal connector 1321 of the negative connector can be electrically connected to the main circuit board 120 through the upper plate bracket 140, without the need for cables, which can reduce the installation process and improve the connection reliability. In addition, a bus conductor is used to converge the current input by the negative connector outside the circuit board 120, which can reduce the number of ports on the main circuit board 120, shorten the loop length, reduce the contact thermal resistance and heat generation, improve the switching efficiency, and reduce the cost of the whole machine. The contact parts of the metal connectors 1321 and 1312 are sheet-like structures and are stacked and connected with the main circuit board 120 or the bus conductor, which can increase the contact area between the contact part and the main circuit board 120 or the bus conductor, shortening the circuit length. The conductive path is formed, thereby improving the conductive performance, and the main circuit board is located in a receiving chamber enclosed by the bottom shell and the cover plate, and the upper plate bracket 140 and the bus conductor are located between the main circuit board 120 and the bottom plate. Therefore, during the production process, the upper plate bracket 140, the bus conductor and the photovoltaic connector can be fixed to the shell first, and then the main circuit board 120 can be placed in the receiving chamber for fixation. Basically, the electrical connection process of all photovoltaic connectors to the main circuit board 120 can be completed at one time, eliminating the tedious cable connection between the photovoltaic connector and the main circuit board 120 during manual connection and the possibility of wiring errors. This solution greatly simplifies the production process, improves production efficiency, and basically eliminates the possibility of wiring failure.

[0144] Figure 8 is a schematic cross-sectional view of the photovoltaic connector shown in Figure 4 taken along line AA. Figures 8(a), 8(b), and 8(c) are schematic cross-sectional views of three different structures, respectively.

[0145] Referring to Figures 6 and 8(a), insulating base 1311 includes a stopper plate 13112. Both ends of stopper plate 13112 are fixed to the inner wall of insulating base 1311. The distance between stopper plate 13112 and the axis of the fixing portion of positive metal connector 1312 is greater than or equal to the radius of the fixing portion. In other words, stopper plate 13112 does not affect the installation position of positive metal connector 1312.

[0146] The side of the limiting plate 13112 close to the fixing portion may be a plane, and the limiting plate 13112 and the axis of the fixing portion are arranged in parallel, that is, the distance between the limiting plate 13112 and the axis of the fixing portion is equal everywhere.

[0147] In some embodiments, the axis of the limiting plate 13112 and the fixing portion may also be arranged in non-parallel directions.

[0148] In some embodiments, the limiting plate 13112 is perpendicular to the circuit board 120 .

[0149] A first protrusion 13121 and a second protrusion 13122 are provided on the peripheral wall of the fixed portion of the positive metal connector 1312. The first protrusion 13121 abuts against the limiting plate 13112 to restrict clockwise rotation of the positive metal connector 1312, while the second protrusion 13122 abuts against the limiting plate 13112 to restrict counterclockwise rotation of the positive metal connector 1312. Specifically, the first and second protrusions respectively contact the limiting plate, with their contact points on either side of the projection of the fixed portion's axis onto the limiting plate.

[0150] The contact points between the first protrusion 13121, the second protrusion 13122 and the limiting plate may not be unique. Therefore, there should be at least one contact point between the first protrusion 13121 and the limiting plate 13112 located on one side of the projection of the axis of the fixed part on the limiting plate, and there should be at least one contact point between the second protrusion 13122 and the limiting plate 13112 located on the other side of the projection of the axis of the fixed part on the limiting plate.

[0151] Referring to Figure 8 , assuming that the fixed portion is divided into upper and lower portions by a dividing plane, wherein the dividing plane is perpendicular to the limiting plate 13112 and passes through the axis of the fixed portion. The first protrusion 13121 is located on the side of the upper portion of the fixed portion close to the limiting plate 13112 and abuts against the limiting plate 13112; the second protrusion 13122 is located on the side of the lower portion of the fixed portion close to the limiting plate 13112 and abuts against the limiting plate 13112. In other words, the first protrusion 13121 is located between the upper portion of the fixed portion and the limiting plate 13112, and the second protrusion 13122 is located between the lower portion of the fixed portion and the limiting plate 13112.

[0152] If the limiting plate 13112 is divided into upper and lower portions by a dividing plane, where the dividing plane is perpendicular to the limiting plate 13112 and passes through the axis of the fixing portion, then the contact point between the first protrusion 13121 and the limiting plate 13112 is located at the upper portion of the limiting plate 13112, and the contact point between the second protrusion 13122 and the limiting plate 13112 is located at the lower portion of the limiting plate 13112. In other words, the contact points between the first protrusion 13121 and the second protrusion 13122 and the limiting plate 13112 are located on either side of the dividing plane.

[0153] The contact points between the first protrusion 13121, the second protrusion 13122 and the limiting plate may not be unique, so there should be at least one contact point between the first protrusion 13121 and the limiting plate 13112 located on one side of the dividing surface, and there should be at least one contact point between the second protrusion 13122 and the limiting plate 13112 located on the other side of the dividing surface.

[0154] The height of the first protrusion 13121 and the second protrusion 13122 is greater than the shortest distance between the outer peripheral wall of the fixed part and the limiting plate 13112. The height of the protrusion refers to the height of the protrusion along the radial direction of the fixed part, that is, the distance between the protrusion and the outer peripheral wall of the fixed part in the radial direction of the fixed part. Alternatively, the height of the protrusion may also refer to the distance between the contact point between the protrusion and the limiting plate and the outer peripheral wall of the fixed part in the radial direction of the fixed part. If the contact point between the protrusion and the limiting plate is not unique, then there should be at least one contact point between the first protrusion 13121 and the limiting plate 13112 whose height is greater than the shortest distance between the outer peripheral wall of the fixed part and the limiting plate 13112, and there should be at least one contact point between the second protrusion 13122 and the limiting plate 13112 whose height is greater than the shortest distance between the outer peripheral wall of the fixed part and the limiting plate 13112.

[0155] In some embodiments, referring to (b) and (c) of Figure 8, the side of the first protrusion 13121 and the second protrusion 13122 close to the limiting plate 13112 is a plane, and the plane of the first protrusion 13121 and the second protrusion 13122 close to the limiting plate 13112 is parallel to the limiting plate 13112 and is attached to the limiting plate 13112.

[0156] In some embodiments, referring to FIG. 8( c ), the first protrusion 13121 and the second protrusion 13122 may be connected to each other as a whole.

[0157] Figure 9 is a schematic cross-sectional view of the photovoltaic connector shown in Figure 4 taken along line AA. As shown in Figure 9(a), one end of the limiting plate 13112 is fixed to the inner wall of the insulating base 1311. In other words, in this embodiment of the present application, at least one end of the limiting plate 13112 can be fixed to the inner wall of the insulating base 1311.

[0158] As shown in FIG9(b), the inner wall of the insulating base 1311 near the first protrusion 13121 and the second protrusion 13122 forms a limiting plane 13113. In other words, the inner wall of the insulating base 1311 may not be a regular circle. The structure of FIG9(a) can be understood as follows: the limiting plane 13113 is formed by the side of the limiting plate 13112 near the positive metal connector 1312, while the side of the limiting plate 13112 away from the positive metal connector 1312 is integrally connected to the inner wall of the insulating base 1311. In this case, the limiting plate 13112 serves as a part of the insulating base 1311.

[0159] Among them, the contact point between the first protrusion 13121 and the limiting plane 13113 is located on one side of the projection of the axis of the fixing part on the limiting plane 13113, and the contact point between the second protrusion 13122 and the limiting plane 13113 is located on the other side of the projection of the axis of the fixing part on the limiting plane 13113.

[0160] Similar to the embodiment shown in FIG8 , assume that there is a dividing plane that divides the fixing portion into two parts, the dividing plane passes through the axis of the fixing portion, and the dividing plane is perpendicular to the limiting plane 13113. Then, the contact point between the first protrusion 13121 and the limiting plane 13113 is located on one side of the dividing plane, and the contact point between the second protrusion 13122 and the limiting plane 13113 is located on the other side of the dividing plane.

[0161] In some embodiments, the limiting plane 13113 may also be a curved surface.

[0162] As shown in (c) of Figure 9, at least one limiting groove 13114 is formed on the inner wall of the insulating base 1311, and at least one protrusion is provided on the fixing portion, which is inserted into the at least one limiting groove 13114 to limit the rotation of the positive metal connector 1312 relative to the insulating base 1311.

[0163] Figure 10 is a schematic cross-sectional view of the photovoltaic connector shown in Figure 4 taken along line AA. As shown in Figure 10, a first support column 13115 and a second support column 13116 are disposed opposite each other within the insulating base 1311. One end of each of the first and second support columns 13115, 13116 is fixed to the inner wall of the insulating base 1311, while the other ends of each of the first and second support columns 13115, 13116 extend toward the fixed portion of the positive metal connector 1312. The first support column 13115 contacts both the first and second protrusions 13121, 13122, with at least a portion of the first support column 13115 positioned between the first and second protrusions 13121, 13122, thereby limiting rotation of the metal connector relative to the insulating base 1311. The distance between the end of the second support column 13116 closest to the positive metal connector 1312 and the axis of the fixed portion of the positive metal connector 1312 is equal to or approximately equal to the radius of the fixed portion. In other words, the end of the second support column 13116 closest to the positive metal connector 1312 abuts against the circumference of the positive metal connector 1312, thereby restricting the positive metal connector 1312 from moving 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 positive metal connector 1312 cannot rotate within the insulating base 1311.

[0164] 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 .

[0165] Similar to the embodiment shown in Figure 8, the contact point between the first protrusion 13121 and the first support column 13115 is located on one side of the projection of the axis of the fixing portion on the end surface of the first support column 13115 close to the fixing portion, and the contact point between the second protrusion 13122 and the first support column 13115 is located on the other side of the projection of the axis of the fixing portion on the end surface of the first support column 13115 close to the fixing portion.

[0166] Similar to the embodiment shown in FIG8 , assume that there is a dividing plane dividing the fixing portion into two parts, the dividing plane passing through the axis of the fixing portion and perpendicular to the end surface of the first support column 13115 near the fixing portion. Then, the contact point between the first protrusion 13121 and the first support column 13115 is located on one side of the dividing plane, and the contact point between the second protrusion 13122 and the first support column 13115 is located on the other side of the dividing plane.

[0167] In some embodiments, referring to FIG10 , a third support column 13117 and a fourth support column 13118 are also disposed relative to each other within the insulating base 1311. The structures of the third support column 13117 and the fourth support column 13118 can be referenced to the description of the first support column 13115 or the second support column 13116 and are not further described here. The first support column 13115, the second support column 13116, the third support column 13117, and the fourth support column 13118 surround the periphery of the fixed portion, thereby limiting the displacement of the metal connector within the insulating base 1311 and preventing a change in the positional relationship between the first protrusion 13121, the second protrusion 13122, and the first support column 13115.

[0168] 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 .

[0169] It should be understood that in the embodiments described above, such as in the embodiments shown in Figures 8 and 9, a second support column 13116 may also be provided in the insulating base 1311, and the second support column 13116 is arranged relative to the limiting plate 13112, the limiting plane 13113 or the limiting groove 13114 to limit the positive metal connector 1312 from moving in a direction away from the limiting plate 13112, the limiting plane 13113 or the limiting groove 13114, so as to avoid a change in 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.

[0170] In the embodiment of the present application, the protrusion formed on the circumferential surface of the fixing portion can also be referred to as a limiting protrusion, and the limiting plate 13112, the limiting plane 13113, the limiting groove 13114, and the first support column 13115 can all be referred to as a limiting 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 to engage with the limiting protrusion formed on the circumferential surface of the fixing portion in the circumferential direction of the fixing portion to limit the rotation of the metal connector relative to the insulating base 1311.

[0171] Figure 11 is a schematic diagram of the structure of a metal connector provided in an embodiment of the present application. As shown in Figure 11, the first protrusion 13121 and the second protrusion 13122 can also be spaced apart in the axial direction of the fixing portion, that is, the first protrusion 13121 and the second protrusion 13122 are spaced apart in the axial direction of the fixing portion.

[0172] Figure 12 is a cross-sectional view of the photovoltaic connector shown in Figure 4 taken along line AA. As shown in Figure 12, a third protrusion 13123 may also be formed on the peripheral surface of the fixing portion of positive metal connector 1312. Third protrusion 13123 is located on the side of the fixing portion away from limiting plate 13112. Third protrusion 13123 abuts against the inner wall of insulating base 1311 to restrict movement of positive metal connector 1312 away from limiting plate 13112, thereby preventing a change in the engagement relationship between first protrusion 13121, second protrusion 13122, and limiting plate 13112.

[0173] In some embodiments, the third protrusion 13123 abuts against an end of the second support column 13116 close to the positive metal connector 1312 (not shown in the figures), thereby preventing the positive metal connector 1312 from moving away from the limiting structure.

[0174] It should be noted that the first protrusion 13121 , the second protrusion 13122 and the third protrusion 13123 are located on one side of a portion of the insulating base 1311 where the inner diameter is equal to the diameter of the fixing portion.

[0175] Figure 13 is a cross-sectional view of the photovoltaic connector shown in Figure 4 at position CC. As shown in Figure 13, the inner diameter of insulating base 1311 may vary at different locations. The inner diameter of at least a portion of insulating base 1311 is the same as or similar to the diameter of the fixed portion of positive metal connector 1312 to prevent displacement of positive metal connector 1312 within insulating base 1311, thereby preventing a change in the positional relationship between the retaining protrusion and the retaining structure.

[0176] Referring to Figure 13 , positive metal connector 1312 can be inserted into insulating base 1311 from one end of insulating base 1311 located within the accommodating cavity defined by housing 110, with at least a portion of the fixed portion of positive metal connector 1312 extending through the portion of insulating base 1311 where the inner diameter and the fixed portion have equal diameters. Positive metal connector 1312 also includes a resilient clip 13126. One end of resilient clip 13126, distal from the contact portion of positive metal connector 1312, is fixed to the peripheral surface of the fixed portion of positive metal connector 1312, while the other end is raised.

[0177] The elastic clip 13126 is elastic, and the raised portion of the elastic clip 13126 can be pressed against the surface of the fixing portion, facilitating the fixing portion to pass through the portion where the inner diameter of the insulating base 1311 and the diameter of the fixing portion are equal. After the elastic clip 13126 passes through the portion where the inner diameter of the insulating base 1311 and the diameter of the fixing portion are equal, the unsecured end of the elastic clip 13126 rises and abuts against the portion where the inner diameter of the insulating base 1311 and the diameter of the fixing portion are equal.

[0178] In the embodiment of the present application, the portion where the inner diameter of the insulating base 1311 is equal to the diameter of the fixing portion is located between the elastic clip 13126 and the third protrusion 13123. Thus, the elastic clip 13126 and the third protrusion 13123 clamp the portion where the inner diameter of the insulating base 1311 is equal to the diameter of the fixing portion in the axial direction of the fixing portion, thereby restricting the axial movement of the positive metal connector 1312 along the insulating base, that is, restricting the forward and backward movement of the positive metal connector 1312 within the insulating base, thereby preventing the positional relationship between the limiting protrusion formed on the circumferential surface of the fixing portion and the limiting structure formed on the inner wall of the insulating base 1311 from changing.

[0179] In some embodiments, the first protrusion 13121 or the second protrusion 13122 abuts against the other side of the portion of the insulating base 1311 where the inner diameter is equal to the diameter of the fixing portion.

[0180] Figure 14 is a schematic cross-sectional view of the photovoltaic connector shown in Figure 4, taken along line BB. Referring to Figures 5, 6, and 14, the contact portion of the positive metal connector 1312 located within the insulating base 1311 is formed with a first protruding structure 13124 and a second protruding structure 13125 on either side. The first protruding structure 13124 and the second protruding structure 13125 serve as wing plates on either side of the contact portion, with the width of the contact portion at the wing plates being greater than at other locations. Correspondingly, two grooves are disposed opposite each other on the inner wall of the insulating base 1311. When the positive metal connector 1312 is inserted into the insulating base 1311, the first protruding structure 13124 and the second protruding structure 13125 are respectively inserted into one of the grooves, thereby restricting the positive metal connector 1312 from rotating relative to the insulating base.

[0181] In some embodiments, the first protrusion structure 13124 and the second protrusion structure 13125 are flat sheet structures, the first protrusion structure 13124 and the second protrusion structure 13125 are parallel to the circuit board 120, and the two opposite grooves on the inner wall of the insulating base 1311 are parallel to the circuit board 120.

[0182] In some embodiments, the contact portion of the positive metal connector 1312 may also include only one protruding structure, and correspondingly, only one groove may be provided on the inner wall of the insulating base 1311. When the positive metal connector 1312 extends into the insulating base 1311, the protruding structure is inserted into the groove, which can also achieve the effect of preventing the positive metal connector 1312 from rotating.

[0183] It should be understood that the first protruding structure 13124 and the second protruding structure 13125 formed on the contact portion are essentially no different from the first protruding portion 13121 and the second protruding portion 13122 formed on the circumference of the fixing portion.

[0184] In the embodiment of the present application, the photovoltaic connector 130 may further include a negative connector 132 . The structure of the negative connector 132 may refer to the relevant description of the positive connector 131 , which will not be repeated here. Only the differences will be described below.

[0185] 4 and 7 , the upper plate bracket 140 may further include a negative electrode support column 142. The negative connector 132 includes a negative metal connector 1321. The negative electrode support column 142 is used to support the negative metal connector 1321. Specifically, the first portion of the contact portion of the negative metal connector 1321 overlaps the negative electrode support column 142 and is fixedly connected to the negative electrode support column 142.

[0186] In some embodiments, the height difference between the positive support column 141 and the negative support column 142 is greater than or equal to a third predetermined value. Generally, the height of the negative support column 142 is less than that of the positive support column 141. This increases the creepage distance between the positive metal connector 1312 of the positive connector 131 and the negative metal connector 1321 of the negative connector 132, thereby improving the electrical stability of the photovoltaic inverter under high voltage conditions.

[0187] In the embodiment of the present application, because the electrical stability of the photovoltaic inverter needs to be ensured, the height of the negative electrode support column 142 is less than the height of the circuit board 120. Therefore, the negative metal connector 1321 is not directly electrically connected to the circuit board 120, but is instead electrically connected to the circuit board 120 via an additional metal connector (not shown). Specifically, the photovoltaic connector 130 may further include a metal connector, one end of which is connected to the first portion of the contact portion of the negative metal connector 1321 and the other end of which is connected to the circuit board 120. Thus, the negative metal connector 1321 can be electrically connected to the circuit board 120 via the metal connector.

[0188] In some embodiments, one end of the metal connector connected to the negative metal connector 1321 and the first portion of the contact portion of the negative metal connector 1321 are fixedly connected to the side of the negative electrode support column 142 close to the circuit board 120. In this way, the connection between the metal connector and the negative metal connector 1321 is more stable, which helps improve the electrical stability of the photovoltaic inverter.

[0189] In the embodiment of the present application, the end of the metal connector that connects to the negative metal connector 1321 can also be a flat sheet-like 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 will not fit together, which may cause poor contact and affect the electrical stability of the photovoltaic inverter. Therefore, the structure of the negative metal connector 1321 is similar to that of the positive metal connector 1312, both including a protrusion or raised structure to limit the rotation of the metal connector, thereby reducing the difficulty of assembling the photovoltaic inverter and preventing the metal connector from twisting and damaging.

[0190] Figure 15 shows a schematic diagram of the connection between the photovoltaic assembly 10 and the photovoltaic inverter 20 in Figure 1. Figure 16 is a three-dimensional structural diagram of some components of the photovoltaic inverter 20 provided in an embodiment of the present application.

[0191] As shown in Figures 15 and 16 , the photovoltaic inverter 20 may include a housing 200, a main circuit board 210, a positive connector 300, a negative connector 400, an upper plate bracket 500, and a bus conductor 600. The main circuit board 210 and the upper plate bracket 500 are located within the housing 200. The positive connector 300 and the negative connector 400 are electrically connected to the main circuit board 210 via the upper plate bracket 500. The upper plate bracket 500 and the main circuit board 210 may be fixedly connected via screws 220. The photovoltaic connectors (including the positive connector 300 and the negative connector 400) can be electrically connected to the main circuit board 210 via the upper plate bracket 500, eliminating the need for cables. This reduces the installation process and improves connection reliability.

[0192] Among them, the main circuit board 210 can be a whole piece, or include multiple circuit sub-boards, and multiple circuit sub-boards are spliced ​​into the main circuit board 210. The function of each circuit sub-board can be set according to needs, and the positive connector 300 and the negative connector 400 can be connected to one of the circuit sub-boards.

[0193] The main circuit board 210 may be provided with an inverter circuit for inverting the direct current of the photovoltaic module 10 and outputting it as alternating current. Furthermore, the main circuit board 210 may also be provided with a rectifier circuit for rectifying the alternating current into direct current.

[0194] As shown in Figure 15 , the housing 200 includes a bottom shell and a cover plate 201. The bottom shell and the cover plate 201 enclose a receiving chamber. The bottom shell includes a bottom plate 202 disposed opposite the cover plate 201. A heat sink is mounted on the side of the bottom plate 202 away from the cover plate 201. The main circuit board 210 and the upper plate bracket 500 are both located in the receiving chamber. The upper plate bracket 500 is located between the main circuit board 210 and the bottom plate 202 and can be fixedly connected to the bottom plate 202.

[0195] In some embodiments, the bottom shell also includes a first side plate 203 located between the bottom plate 202 and the cover plate 201, the first side plate 203 is perpendicular to the bottom plate 202 and the cover plate 201, the positive connector 300 and the negative connector 400 are both fixed to the first side plate 203, along the first direction, the distance between the positive connector 300 and the bottom plate 202 is greater than the distance between the negative connector 400 and the bottom plate 202, along the second direction, the positive connector 300 and the negative connector 400 are arranged alternately in sequence, the first direction is perpendicular to the plane where the main circuit board 210 is located, the second direction is parallel to the plane where the first side plate 203 is located, and the second direction is perpendicular to the first direction.

[0196] In the present application, multiple positive connectors 300 and multiple negative connectors 400 are alternately arranged in sequence along the second direction and staggered along the first direction, thereby reducing mutual interference in the electrical connection between the positive connectors 300 and the negative connectors 400, improving the stability of the electrical connection and making the overall local more regular.

[0197] In some embodiments, the main circuit board 210 includes a front side and a back side of the circuit board disposed opposite to each other along the first direction, the front side of the circuit board facing the cover plate 201, and the back side of the circuit board facing the base plate 202. The main circuit board 210 divides the receiving chamber into a first receiving chamber and a second receiving chamber, the first receiving chamber being located between the front side of the main circuit board and the cover plate 201, and the second receiving chamber being located between the back side of the circuit board and the base plate 202. The volume of the first receiving chamber is smaller than the volume of the second receiving chamber, so as to respectively receive a first device and a second device. The operating heat generation of the second device is greater than the operating heat generation of the first device, or the length of the second device along the first direction is greater than the length of the first device along the first direction. The first device includes a chip resistor, a chip capacitor, and an indicator light fixed to the front side of the circuit board, and the second device includes an inverter power component, a busbar capacitor, and an inductor fixed to the back side of the circuit board.

[0198] It should be understood that placing the main circuit board 210, the upper plate bracket 500 and the electronic components in the receiving chamber can, on the one hand, protect the main circuit board 210, the upper plate bracket 500 and the electronic components, and on the other hand, effectively utilize the cavity space to avoid the cavity being too large, thereby improving space utilization and reducing costs. The second device can be thermally connected to the heat sink fins through the bottom plate 202, which is conducive to shortening the heat transfer path and improving the heat dissipation effect.

[0199] It is understandable that the height of the electronic device (i.e., the second device) contained in the second accommodating cavity is higher than the height of the electronic device (i.e., the first device) contained in the first accommodating cavity. For example, the height of the second device is less than or equal to 9 cm, and the height of the first device is less than or equal to 5 mm. In other words, the second accommodating cavity can accommodate electronic devices with high height, large volume, and high heat dissipation requirements, such as inverter power components, busbar capacitors and inductors, etc.; the first accommodating cavity can accommodate electronic devices with low height, small volume, and low heat dissipation requirements, such as chip capacitors, chip resistors, indicator lights, etc.

[0200] As shown in FIG15 , the photovoltaic assembly 10 includes at least one photovoltaic panel 11, which is connected to the main circuit board 210. In some embodiments, the photovoltaic assembly 10 includes multiple photovoltaic panels 11 connected in series. Through the series connection, the DC power from the multiple photovoltaic panels 11 is aggregated and connected to the inverter circuit in the main circuit board 210 via the positive connector 300 and the negative connector 400. The photovoltaic assembly 10 includes a positive terminal and a negative terminal. Within the photovoltaic assembly 10, current flows from the negative terminal to the positive terminal of the photovoltaic assembly 10. Both the positive and negative terminals of the photovoltaic assembly 10 are connected to the main circuit board 210.

[0201] In some embodiments, the ends of the positive connector 300 and the negative connector 400 that are away from the main circuit board 210 are electrically connected to the photovoltaic module 10. Therefore, the positive connector 300 and the negative connector 400 can also be referred to as photovoltaic connectors. Specifically, one end of the positive connector 300 is connected between the upper board bracket 500 and the main circuit board 210, and the other end of the positive connector 300 is connected to the positive terminal of the photovoltaic module 10; one end of the negative connector 400 is electrically connected to the main circuit board 210 via the bus conductor, and the other end of the negative connector 400 is connected to the negative terminal of the photovoltaic module 10.

[0202] In other embodiments, the positive connector 300 and the negative connector 400 are electrically connected to the energy storage system 30 (i.e., the external energy storage device) at one end away from the main circuit board 210. Therefore, the positive connector 300 and the negative connector 400 can also be referred to as energy storage connectors. Specifically, one end of the positive connector 300 is connected between the upper board bracket 500 and the main circuit board 210, and the other end of the positive connector 300 is connected to the positive pole of the external energy storage device; one end of the negative connector 400 is electrically connected to the main circuit board 210 through the bus conductor, and the other end of the negative connector 400 is connected to the negative pole of the external energy storage device.

[0203] On the one hand, the energy storage connector can obtain direct current from an external energy storage device and output direct current to the inverter circuit on the main circuit board 210, and the inverter circuit can invert the direct current into alternating current for use. On the other hand, the energy storage connector can also transmit electrical energy to the external energy storage device, that is, output direct current to the external energy storage device. It should be understood that when charging an external energy storage device (such as a battery pack), the source of electrical energy can be the electrical energy provided by the photovoltaic assembly 10 or the mains electricity. The alternating current can be rectified into direct current through the rectifier circuit on the main circuit board 210, and the direct current can be transmitted to the external energy storage device (such as a battery pack) through the energy storage connector to charge the external energy storage device (such as a battery pack).

[0204] In some other embodiments, a portion of the multiple positive connectors 300 and the multiple negative connectors 400 can be connected to the photovoltaic component 10, and another portion of the multiple positive connectors 300 and the multiple negative connectors 400 can be connected to the energy storage system 30 (i.e., the external energy storage device). Specifically, one end of a part of the multiple positive connectors 300 is connected between the upper plate bracket 500 and the main circuit board 210, the other end of a part of the multiple positive connectors 300 is connected to the positive pole of the photovoltaic component 10, one end of a part of the multiple negative connectors 400 is electrically connected to the main circuit board 210 through the bus conductor, and the other end of a part of the multiple negative connectors 400 is connected to the negative pole of the photovoltaic component 10; one end of another part of the multiple positive connectors 300 is connected between the upper plate bracket 500 and the main circuit board 210, the other end of another part of the multiple positive connectors 300 is connected to the positive pole of the external energy storage device, one end of another part of the multiple negative connectors 400 is electrically connected to the main circuit board 210 through the bus conductor, and the other end of another part of the multiple negative connectors 400 is connected to the negative pole of the external energy storage device.

[0205] In some embodiments, as shown in FIG15 , the positive connector 300 includes a first housing 310 and a first terminal 320. The first housing 310 is fixed to the outside of the first side plate 203. The first terminal 320 is located within the first housing 310 and extends into the interior of the housing 200. The first terminal 320 can be crimped together with the main circuit board 210 by the screw 220. The negative connector 400 includes a second housing 410 and a second terminal 420. The second housing 410 is fixed to the outside of the first side plate 203. The second terminal 420 is located within the second housing 410 and extends into the interior of the housing 200.

[0206] In some embodiments, as shown in FIG15 , the positive connector 300 is connected between the positive terminal of the photovoltaic module 10 and the main circuit board 210. Specifically, a first end of the positive connector 300 is connected to the positive terminal of the photovoltaic module 10, and a second end of the positive connector 300 is connected to the main circuit board 210 via the first terminal 320 and the upper board bracket 500. For example, the main circuit board 210 is fixed between the main circuit board 210 and the upper board bracket 500 using the screw 220.

[0207] Similarly, the negative connector 400 can be connected between the negative terminal of the photovoltaic module 10 and the main circuit board 210. Specifically, the first end of the negative connector 400 is connected to the negative terminal of the photovoltaic module 10, and the second end of the negative connector 400 is electrically connected to the main circuit board 210 through the second terminal 420, the upper board bracket 500, and the bus conductor 600.

[0208] Referring to FIG2 , it can be seen that the bus conductor 600 is used to converge the currents inputted from multiple negative electrodes and transmit them to the main circuit board 210. As shown in FIG16 , the bus conductor 600 includes a bus metal sheet 610 and a transition metal sheet 620. The bus metal sheet 610 is electrically connected to the multiple negative connectors 400 and is used to converge the currents transmitted by the multiple negative connectors 400. The transition metal sheet 620 extends along the first direction, with a first end of the transition metal sheet 620 fixedly connected to the bus metal sheet 610 and a second end of the transition metal sheet 620 fixedly connected to the main circuit board 210. The transition metal sheet 620 is used to transmit the negative current converged by the bus metal sheet 610 to the main circuit board 210.

[0209] In some embodiments, the bus metal sheet 610 and the transition metal sheet 620 may be fixedly connected by fasteners 570 (such as screws).

[0210] In the present application, the positive connector 300 is connected between the upper board bracket 500 and the main circuit board 210, and the negative connector 400 is electrically connected to the main circuit board 210 via a bus conductor 600. The bus conductor 600 can directly combine the currents in multiple circuits and then transmit them to the main circuit board 210. The bus conductor 600 may include a bus metal sheet 610 and a transition metal sheet 620. The bus metal sheet 610 combines the currents transmitted by multiple negative connectors 400 and transmits them to the transition metal sheet 620. The transition metal sheet 620 then transmits the combined current to the main circuit board 210, thereby transmitting the current from the negative connector 400 to the main circuit board 210. This can reduce the number of separate upper board conductors, shorten the loop length, reduce contact thermal resistance and heat generation, improve transfer efficiency, and reduce the cost of the entire device.

[0211] It should be noted that the positive and negative terminals of the photovoltaic connectors are for illustrative purposes only. The positive connector 300 may also be connected to the positive terminal of the photovoltaic module 10, and the negative connector 400 may also be connected to the negative terminal of the photovoltaic module 10, which is not limited in this application.

[0212] It should be understood that the fixing method of the bus conductor described above is not limited to the above solution. In a possible implementation, the bus conductor can also be set on the main circuit board, or set near the switch, thereby reducing the width of the entire inverter.

[0213] The specific structures of the upper plate support 500, bus conductor 600, and integrated circuit board 700 provided in the embodiment of the present application will be described in detail below with reference to Figures 17 and 18. Figure 4 is a perspective structural diagram of the upper plate support 500 provided in the embodiment of the present application. Figure 5 is a perspective structural diagram of the bus conductor 600 and integrated circuit board 700 provided in the present application.

[0214] 15 and 17 , the upper board bracket 500 includes first-type support columns 510, second-type support columns 520, and a base 530. The first-type support columns 510 and the second-type support columns 520 are alternately arranged along a second direction, which is perpendicular to the first direction. The base 530 is fixed to the bottom board 202. The first ends of the first-type support columns 510 are fixed to the base 530, and the second ends of the first-type support columns 510 are connected to the main circuit board 210, with the second ends of the first-type support columns 510 being the ends away from the base 530. One end of the positive connector 300 is connected between the second ends of the first-type support columns 510 and the main circuit board 210. The first end of the second-type support column 520 is fixed on the base 530, the second end of the second-type support column 520 is connected to one end of the negative connector 400, the second end of the second-type support column 520 is the end away from the base 530, the height of the second-type support column 520 along the first direction is less than the height of the first-type support column 510 along the first direction, and the height difference between the second-type support column 520 and the first-type support column 510 along the first direction is greater than the first threshold.

[0215] In some embodiments, one end of the positive connector 300 can be connected between the second end of the first-type support column 510 and the main circuit board 210, and the other end of the positive connector 300 can be connected to the positive terminal of the photovoltaic module 10; one end of the negative connector 400 can be connected to the second end of the second-type support column 520, and the other end of the negative connector 400 can be connected to the negative terminal of the photovoltaic module 10. The number of the positive connector 300, the negative connector 400, the first-type support column 510, and the second-type support column 520 can be multiple, and one positive connector 300 is connected to one first-type support column 510, and one negative connector 400 is connected to one second-type support column 520.

[0216] It should be understood that the height of the second type of support column 520 along the first direction is less than the height of the first type of support column 510 along the first direction, and the height difference between the second type of support column 520 and the first type of support column 510 along the first direction is greater than a first threshold value. The first direction is perpendicular to the plane where the main circuit board 210 is located, so that the insulation distance between the first type of support column 510 and the second type of support column 520 meets certain requirements to avoid problems such as discharge and short circuit.

[0217] In an embodiment of the present application, the positive connector 300 is connected between the first type of support column 510 and the main circuit board 210, that is, it can be directly electrically connected to the main circuit board 210 through the first type of support column 510; the negative connector 400 is electrically connected to the main circuit board 210 through the second type of support column 520 and the bus conductor 600, and the bus conductor 600 can directly combine the currents in multiple circuits and then transfer them to the main circuit board, thereby reducing the number of separate board conductors, shortening the loop length, reducing contact thermal resistance and heat generation, improving transfer efficiency, and reducing the cost of the entire machine.

[0218] Furthermore, by adopting a vertically staggered design for the first-type support columns 510 and the second-type support columns 520, for example, the positive connector 300 of the positive electrode is connected to the first-type support column 510, and the negative connector 400 of the negative electrode is connected to the second-type support column 520, the spatial staggered design can reduce the overall volume of the upper plate bracket 500, laying the foundation for miniaturization of the entire device.

[0219] In some embodiments, the first type of support column 510 includes multiple first support parts, and the second type of support column 520 includes multiple second support parts. The multiple first support parts and the multiple second support parts are alternately arranged in sequence along the second direction. Along the first direction, the distance between the surface of the first support part away from the base plate 202 and the base plate 202 is greater than the distance between the surface of the second support part away from the base plate 202 and the base plate 202. One end of a part of the multiple photovoltaic connectors (i.e., multiple positive connectors 300) is respectively fixed to the surface of the multiple first support parts away from the base plate 202, and one end of another part of the multiple photovoltaic connectors (i.e., multiple negative connectors 400) is respectively fixed to the surface of the multiple second support parts away from the base plate 202.

[0220] For example, as shown in Figures 16 and 17, the first type of support column 510 includes a first type of support column 511, a second type of support column 512, a third type of support column 513, and a fourth type of support column 514. Nuts 540 are installed on the second ends of the first type of support column 511, the second type of support column 512, the third type of support column 513, and the fourth type of support column 514. Specifically, a nut 541 is installed on the second end of the first type of support column 511, a nut 542 is installed on the second end of the second type of support column 512, a nut 543 is installed on the second end of the third type of support column 513, and a nut 544 is installed on the second end of the fourth type of support column 514. Multiple screws 220 pass through the main circuit board 210 and the first terminal 320, crimping the first terminal 320 to the circuit board 210. It should be noted that this embodiment of the application does not limit the number of support columns included in the first type of support column 510.

[0221] Similarly, the second-type support column 520 includes a fifth support column 521, a sixth support column 522, a seventh support column 523, and an eighth support column 524. The second ends of the fifth support column 521, the sixth support column 522, the seventh support column 523, and the eighth support column 524 each have through holes, through which fasteners such as screws can pass through the second terminal 420 and the second-type support column to secure the negative connector 400 to the second-type support column 520. It should be noted that this embodiment of the present application does not limit the number of support columns included in the second-type support column 520.

[0222] As shown in Figure 17, the upper plate bracket 500 may also include a connecting piece 540, which is fixedly connected to the first type of support column 510 or the base 530, and the second end of the connecting piece 540 is connected to the main circuit board 210. The second end of the connecting piece 540 is the end away from the base 530, and the height difference between the second end of the connecting piece 540 and the second end of the second type of support column 520 along the first direction is less than the second threshold; one end of the bus conductor 600 is connected between the main circuit board 210 and the second end of the connecting piece 540.

[0223] It should be understood that the height difference between the second end of the connecting member 540 and the second end of the first type support column 510 along the first direction is smaller than the second threshold, so that the connecting member 540 can support the bus conductor 600 .

[0224] In some embodiments, along the first direction, the connector 540 is located between the integrated circuit board 700 and the main circuit board 210, and the projection of the connector 540 along the first direction partially overlaps with the projection of the integrated circuit board 700 along the first direction. Along the third direction, the distance between the connector 540 and the first side panel 203 is greater than the distance between the first type of support column 510 and the first side panel 203.

[0225] In one example, the first end of the connector 540 is fixedly connected to the base 530, the second end of the connector 540 is connected to the main circuit board 210, and one end of the bus conductor 600 can be connected between the main circuit board 210 and the second end of the connector 540, that is, the bus conductor 600 is stuck between the connector 540 and the main circuit board 210.

[0226] In another example, the connector 540 is suspended and the side of the connector 540 is fixedly connected to the side of the first type support column 511, the second end of the connector 540 is connected to the main circuit board 210, and one end of the bus conductor 600 can be connected between the main circuit board 210 and the second end of the connector 540.

[0227] In some embodiments, as shown in Figure 18, the joint 540 includes a first joint 541 and a second joint 542. The side of the first joint 541 can be fixedly connected to the side of the first type of support column 510, and the second joint 542 can be fixedly connected to the first type of support column 510 and the base 530.

[0228] Exemplarily, the side of the first type support column 511 close to the second type support column 512 can extend along a third direction to form a first side extension portion, and the side of the second type support column 512 close to the first type support column 511 can extend along the third direction to form a second side extension portion. The first joint 541 can be connected between the first side extension portion and the second side extension portion. The side of the second type support column 512 away from the first type support column 511 can extend along the third direction to form a third side extension portion. The first side of the second joint 542 is connected to the third side extension portion, the second side of the second joint 542 extends along the first direction toward the base 530 and is fixedly connected to the base 530, and the first side of the second joint 542 and the second side of the second joint 542 are two opposite sides.

[0229] It should be understood that the main circuit board 210 has a through hole, and the end of the bus conductor 600 (or the transition metal sheet 620, or the metal connecting sheet 630) connected to the main circuit board 210 is also provided with a through hole. The through hole on the main circuit board 210 and the through hole on the bus conductor 600 overlap in their projections along the first direction. The screw can pass through the through hole on the main circuit board 210 and the through hole on the bus conductor 600 and be screwed onto the second end of the bridge 540. In other words, the screw can pass through the through hole on the main circuit board 210 and the through hole on the bus conductor 600 and be fixedly connected to the bridge 540.

[0230] As shown in Figures 16 and 18, the bus conductor 600 can be a multi-circuit combined upper board bus conductor. The bus conductor 600 can include a bus metal sheet 610 and a transition metal sheet 620. The bus metal sheet 610 can include multiple bus ends and transition ends. The multiple bus ends are respectively connected to the second ends of the second-type support columns 520 and electrically connected to multiple negative connectors 400. The transition ends are fixedly connected to the transition metal sheet 620. The first end of the transition metal sheet 620 is fixedly connected to the bus metal sheet 610, and the second end of the transition metal sheet 620 is fixedly connected to the main circuit board 210. The transition metal sheet 620 is used to transmit the negative current obtained by the bus metal sheet 610 to the main circuit board 210.

[0231] In an embodiment of the present application, the busbar metal sheet 610 may include multiple busbar ends and adapter ends, wherein the multiple busbar ends can be electrically connected to the multiple negative connectors 400, respectively. In other words, the multiple busbar ends can be connected to the second end faces of the multiple second-type support columns 520, and the multiple negative connectors 400 can be connected to the second end faces of the multiple second-type support columns 520, respectively. Therefore, the multiple busbar ends can be electrically connected to the multiple negative connectors 400, respectively. After the multiple busbar ends of the busbar metal sheet 610 are electrically connected to the multiple negative connectors 400, the current is combined and then transferred to the adapter metal sheet 620 through the adapter end after being combined into one path. The adapter metal sheet 620 then transmits the combined current to the main circuit board 210. This can reduce the number of separate upper board conductors, shorten the loop length, reduce contact thermal resistance and heat generation, and improve the transfer efficiency.

[0232] It should be understood that the positive connector 300 is directly electrically connected to the upper board support 500, and the negative connector 400 is electrically connected to the upper board support 500 via the bus conductor 600. The provision of the upper board support 500 not only secures the multiple positive connectors 300 and the multiple negative connectors 400 together, improving the stability of their connection to the main circuit board 210, but also allows for rational wiring planning and routing, facilitating the installation and connection of the photovoltaic inverter. The provision of the bus conductor 600 allows the negative connector 400 to be positioned farther from the main circuit board 210 than the positive connector 300 in the first direction. The staggered arrangement of the negative connector 400 and the positive connector 300 helps conserve installation space on the main circuit board 210 and allows for the densest possible distribution of the multiple negative connectors 400 and the positive connector 300.

[0233] The bus conductors 600 may include a plurality of bus conductors, and are used to transfer the current transmitted by the negative connector 400 to the main circuit board 210. One of the bus conductors may be connected to the second ends of at least two of the second-type support pillars 520, thereby combining the currents to transmit multiple currents to the main circuit board 210. Alternatively, one of the bus conductors may be connected to the second end of a single second-type support pillar 520, thereby transmitting a single current to the main circuit board 210 without combining the currents.

[0234] Exemplarily, the busbar metal sheet 610 may include a first busbar metal sheet 611 and a second busbar metal sheet 612. The first busbar metal sheet 611 may be designed as a combined circuit, that is, the first busbar metal sheet 611 may be connected between the second ends of multiple support pillars (e.g., the seventh support pillar 523 and the eighth support pillar 524) and the transition metal sheet 620. The first busbar metal sheet 611 may transmit multiple negative currents to the connecting metal sheet 620. The second busbar metal sheet 612 may be connected between the second end of a support pillar (e.g., the sixth support pillar 522) and the transition metal sheet 620. The second busbar metal sheet 612 may transmit one negative current to the transition metal sheet 620.

[0235] As shown in Figures 16 and 18, the photovoltaic inverter 20 may also include an integrated circuit board 700 and an electrical component 800. The integrated circuit board 700 is fixed to the base 530 and connected to the multiple negative connectors 400. Along the first direction, the integrated circuit board 700 is located between the bus metal sheet 610 and the main circuit board 210. Along the third direction, the integrated circuit board 700 is located on the side of the first type of support column 510 away from the first side plate 203, and the third direction is perpendicular to the first direction and the second direction; the electrical component 800 is used to realize at least one function of DC filtering, surge protection, temperature detection and current detection, and the electrical component 800 is fixed to the surface of the integrated circuit board 700 facing the main circuit board 210.

[0236] It should be understood that functions such as DC filtering, surge protection, temperature detection, and current detection can be integrated into the integrated circuit board 700, depending on the size and integration level of the integrated circuit board. Generally, at least one of the functions of DC filtering, surge protection, temperature detection, and current detection can be integrated into the integrated circuit board 700, thereby reducing the size of the main circuit board 210, thereby reducing the size of the entire device and lowering costs.

[0237] It should be understood that functional modules such as DC filtering and surge protection are strongly coupled to the positive and negative DC power flows and are suitable for being standalone modules. Devices such as DC filtering and surge protection are integrated into the integrated circuit board 700, which can be directly connected to the negative connector 400. An NTC detection device is integrated into the integrated circuit board 700, which contacts the bus conductor 600 and performs temperature detection. A current detection device (such as a Hall effect sensor) is integrated into the integrated circuit board 700 and contacts the bus conductor 600 to perform current detection.

[0238] In one example, the integrated circuit board 700 may integrate a DC filtering function. It should be understood that when negative current is input into the photovoltaic inverter, it may first be filtered by the integrated circuit board 700. The filtered current is then transmitted to the main circuit board 210 via the bus conductor 600. This ensures that the current transmitted to the main circuit board 210 is relatively pure and reduces current loss during transmission.

[0239] In one example, the integrated circuit board 700 may be integrated with a temperature detection function, and the electrical component 800 may be a temperature sensor. The interface where the male and female ends of a photovoltaic connector meet is susceptible to failure due to high temperatures, so temperature detection at this interface is necessary. By integrating the temperature detection function onto the integrated circuit board 700, the integrated circuit board 700 is closer to the negative connector 400, minimizing temperature losses and enabling more accurate and sensitive temperature detection.

[0240] In some embodiments, as shown in FIG18( b ), the integrated circuit board 700 includes a circuit board body 710 and a connecting piece 720 . One end of the connecting piece 720 is electrically connected to the circuit board body 710 , and the other end of the connecting piece 720 is connected to the second end of the second-type support column 520 and electrically connected to the negative connector 400 . The connecting piece 720 is made of a conductive metal.

[0241] Exemplarily, the connecting piece 720 includes a first connecting piece 721, a second connecting piece 722, and a third connecting piece 723. One end of the first connecting piece 721 is connected to the second end of the sixth support column 522, one end of the second connecting piece 722 is connected to the second end of the seventh support column 523, and one end of the third connecting piece 723 is connected to the second end of the eighth support column 524. The other ends of the first connecting piece 721, the second connecting piece 722, and the third connecting piece 723 are electrically connected to the circuit board body 710. It should be understood that the second terminal 420 of the negative connector 400 is respectively connected to the second ends of the sixth support column 522, the seventh support column 523, and the eighth support column 524. Current can be transmitted to the integrated circuit board 700 through the connecting piece 720, and DC filtering, surge protection, temperature detection, current detection, etc. are performed by the integrated circuit board 700.

[0242] In some embodiments, the integrated circuit board 700 further includes a fixing plate 730 having a through hole. The integrated circuit board 700 can be fixedly connected to the housing 200 (ie, the bottom plate 202 ) through the through hole on the fixing plate 730 .

[0243] It should be noted that the integrated circuit board 700 can be electrically connected to the negative connector 400 through the connecting piece 720, so that current can be transmitted to the integrated circuit board 700. At the same time, the connecting piece 720 can also contact the bus conductor 600, and the bus conductor 600 can contact the main circuit board 210, thereby forming a loop between the integrated circuit board 700 and the main circuit board 210. The current can be transmitted to the integrated circuit board 700 in the formed loop, so that DC filtering, temperature detection, current detection, etc. can be performed on the integrated circuit board 700.

[0244] In some embodiments, in combination with Figures 16 and 17, the upper plate bracket 500 also includes a clip 560, which is fixed on the surface of the base 530 facing the main circuit board 210, and the clip 560 is clamped on both sides of the integrated circuit board 700 along the second direction, for clamping the integrated circuit board 700 and the bus metal sheet 610 together.

[0245] In this implementation, the bus conductor 600 and the integrated circuit board 700 are fixed in a target area by using a snap 560 , thereby preventing the bus conductor 600 and the integrated circuit board 700 from moving.

[0246] In some embodiments, as shown in FIG. 16 and FIG. 18 , the photovoltaic inverter 20 further includes a metal connecting piece 630 , one end of which is connected to the second end of the second-type support column 520 , and the other end of which is connected to the main circuit board 210 . The metal connecting piece 630 is used to transmit the current input by the negative connector 400 to the main circuit board 210 ; the metal connecting piece 630 includes an extension portion 631 , a connecting portion 632 , and an upper fixing portion 633 . The connecting portion 632 is connected between the extension portion 631 and the upper fixing portion 633, the extension portion 631 is parallel to the upper fixing portion 633, and the extension portion 631 extends along the third direction; the upper plate bracket 500 also includes a clip 560, the clip 560 is fixed on the surface of the base 530 facing the main circuit board 210, and the clip 560 is clamped on both sides of the extension portion 631 along the second direction, for clamping the metal connecting plate 630 on the base 530.

[0247] The metal connecting piece 630 can be understood as a single-circuit upper board bus conductor, or as a part of the bus conductor 600. The metal connecting piece 630 can be connected between the second end of the first type support column 511 and the second end of the second bridge 542.

[0248] In this embodiment, the metal connecting piece 630 is fixed to the target area of ​​the base 530 by using a snap 560 , thereby preventing the metal connecting piece 630 from moving.

[0249] In some embodiments, the first type of support column 510 , the second type of support column 520 , the base 530 , and the connecting member 540 may all be made of insulating materials to prevent electrical conduction.

[0250] In some embodiments, the first type support column 510, the second type support column 520, the base 530 and the connecting member 540 are an integrally formed structure. In some embodiments, the first type support column 510, the second type support column 520 and the base 530 are an integrally formed structure.

[0251] In some embodiments, as shown in FIG17 , the base 530 is provided with mounting holes 550, through which the upper plate bracket 500 is fixedly connected to the housing 200 (bottom plate 202). For example, screws can be passed through the mounting holes 550 to secure the upper plate bracket 500 to the bottom plate 202 of the housing 200 of the photovoltaic inverter 20. This improves the consistent stability of the upper plate bracket 500's fixed position, eliminates the need to position the upper plate bracket 500 on the main circuit board 210, and reduces the strength and stress requirements of the main circuit board 210.

[0252] In some embodiments, the upper plate bracket 500 may be a hollow shell to achieve a lightweight design of the upper plate bracket 500 and reduce the weight of the upper plate bracket 500. For example, the first type of support column 510, the second type of support column 520, and the bridge piece 540 may all be hollowed out, that is, the first type of support column 510, the second type of support column 520, and the bridge piece 540 are all hollow structures, thereby minimizing the manufacturing cost and weight while ensuring a stable connection.

[0253] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A photovoltaic inverter, characterized in that: include: A housing, a main circuit board, a photovoltaic connector, an upper board bracket and a bus conductor, wherein the photovoltaic connector includes a positive connector and a negative connector, wherein: The housing comprises a bottom shell and a cover plate, wherein the bottom shell and the cover plate enclose a receiving chamber, the bottom shell comprises a bottom plate arranged opposite to the cover plate, and a radiator is installed on a side of the bottom plate away from the cover plate; The main circuit board is located in the receiving chamber, and the upper board bracket is located between the bottom board and the main circuit board and is fixed to the bottom board; One end of the positive connector is connected between the upper board bracket and the main circuit board and is electrically connected to the main circuit board, and one end of the negative connector is electrically connected to the main circuit board through the bus conductor, and the bus conductor is used to converge the currents of multiple negative pole inputs and transmit them to the main circuit board; The photovoltaic connector comprises an insulating base and a metal plug-in, one end of the insulating base is located inside the housing, the other end of the insulating base is located outside the housing, and the photovoltaic connector is fixed to the housing through the insulating base; The insulating base is a hollow tubular structure, the metal connector is wrapped in the insulating base, the metal connector is a conductive metal conductor, the metal connector includes an interface portion, a fixing portion and a contact portion, the interface portion is used to be connected to the photovoltaic component, the contact portion is a sheet structure, the contact portion is used to be stacked and connected to the main circuit board or the bus conductor, and the fixing portion is used to be fixed to the insulating base.

2. The photovoltaic inverter according to claim 1, characterized in that: The contact portion includes a first part, a second part and a third part, the first part is in contact with the main circuit board, the third part is connected to the fixing portion, the second part is located between the first part and the third part, and the second part is perpendicular to the main circuit board.

3. The photovoltaic inverter according to claim 1, characterized in that: The portion of the contact portion located inside the insulating base includes at least one protruding structure. At least one groove is formed on the inner wall of the insulating base, and the at least one protruding structure is inserted into the at least one groove.

4. The photovoltaic inverter according to any one of claims 1 to 3, characterized in that: The bus conductor includes a bus metal sheet and a transfer metal sheet, the bus metal sheet is electrically connected to the plurality of negative connectors, and the bus metal sheet is used to uniformly bus the currents transmitted by the plurality of negative connectors; The transition metal sheet extends along a first direction, the first end of the transition metal sheet is fixedly connected to the bus metal sheet, the second end of the transition metal sheet is fixedly connected to the main circuit board, the transition metal sheet is used to transmit the negative current obtained by the bus metal sheet to the main circuit board, and the first direction is perpendicular to the plane where the main circuit board is located.

5. The photovoltaic inverter according to claim 4, characterized in that: The upper plate bracket comprises a first type of support column, a second type of support column and a base, the first type of support column and the second type of support column are alternately arranged in sequence along a second direction, the second direction is perpendicular to the first direction, and the base is fixed to the bottom plate; The first end of the first type of support column is fixed on the base, the second end of the first type of support column is connected to the main circuit board, and the second end of the first type of support column is an end away from the base; One end of the positive connector is connected between the second end of the first type supporting column and the main circuit board.

6. The photovoltaic inverter according to claim 5, characterized in that: The first end of the second type of support column is fixed on the base, the second end of the second type of support column is connected to one end of the negative connector, the second end of the second type of support column is an end away from the base, the height of the second type of support column along the first direction is less than the height of the first type of support column along the first direction, and the height difference between the second type of support column and the first type of support column along the first direction is greater than a first threshold; The busbar metal sheet includes a plurality of busbar ends and a transfer end. The plurality of busbar ends are respectively connected to the second ends of the second-type support columns, and the transfer end is fixedly connected to the transfer metal sheet.

7. The photovoltaic inverter according to claim 4, characterized in that: The upper board bracket further comprises a lap joint, the lap joint is fixedly connected to the first type of support column or the base, the second end of the lap joint is connected to the main circuit board, the second end of the lap joint is an end away from the base, and the height difference between the second end of the lap joint and the second end of the first type of support column along the first direction is less than a second threshold value; The second end of the transition metal sheet is connected between the main circuit board and the second end of the connecting member.

8. The photovoltaic inverter according to claim 6, characterized in that: The bottom shell also includes a first side plate located between the bottom plate and the cover plate, the first side plate is perpendicular to the bottom plate and the cover plate, the positive connector and the negative connector are both fixed to the first side plate, along the first direction, the distance between the positive connector and the bottom plate is greater than the distance between the negative connector and the bottom plate, along the second direction, multiple positive connectors and multiple negative connectors are alternately arranged in sequence, and the second direction is parallel to the plane where the first side plate is located.

9. The photovoltaic inverter according to claim 8, characterized in that: The positive connector includes a first housing and a first terminal, wherein the first housing is fixed to the outside of the first side plate, the first terminal is located in the first housing and extends into the interior of the housing, and is connected to the second end of the first type support column; The negative connector includes a second shell and a second terminal. The second shell is fixed to the outside of the first side plate. The second terminal is located in the second shell and extends into the interior of the shell and is connected to the second end of the second type support column.

10. The photovoltaic inverter according to claim 1, characterized in that: The main circuit board comprises a front side of the circuit board and a back side of the circuit board which are arranged in opposite directions along a first direction, the front side of the circuit board faces the cover plate, and the back side of the circuit board faces the bottom plate, the main circuit board divides the receiving chamber into a first receiving chamber and a second receiving chamber, the first receiving chamber is located between the front side of the main circuit board and the cover plate, the second receiving chamber is located between the back side of the circuit board and the bottom plate, and the volume of the first receiving chamber is smaller than that of the second receiving chamber, so as to receive the first device and the second device respectively; Among them, the working heat generation of the second device is greater than the working heat generation of the first device, or the length of the second device along the first direction is greater than the length of the first device along the first direction, the first device includes a chip resistor, a chip capacitor and an indicator light fixed to the front side of the circuit board, and the second device includes an inverter power component, a bus capacitor and an inductor fixed to the back side of the circuit board.

11. The photovoltaic inverter according to claim 1, characterized in that: The photovoltaic inverter includes a knob switch and a DC / DC circuit. The knob switch is electrically connected between the photovoltaic connector and the DC / DC circuit. The knob switch includes a plurality of disconnecting units. Each of the at least two positive connectors is connected to the DC / DC circuit through one of the multiple disconnecting units, and at least two negative connectors are connected to the DC / DC circuit through one of the multiple disconnecting units after being merged.

12. The photovoltaic inverter according to claim 1 or 11, characterized in that: The bus conductor is fixed to the main circuit board.

13. The photovoltaic inverter according to claim 8, characterized in that: The photovoltaic inverter further includes an integrated circuit board and electrical components, wherein the integrated circuit board is fixed to the base and connected to the plurality of negative connectors, wherein the integrated circuit board is located between the bus metal sheet and the main circuit board along the first direction, and wherein the integrated circuit board is located on a side of the first type of support column away from the first side plate along the third direction, and wherein the third direction is perpendicular to the first direction and the second direction; The electrical component is used to realize at least one of direct current filtering, surge protection, temperature detection and current detection functions, and the electrical component is fixed on the surface of the integrated circuit board facing the main circuit board.

14. The photovoltaic inverter according to claim 13, characterized in that: The upper board bracket also includes a clip, which is fixed on the surface of the base facing the main circuit board. The clip is clamped on both sides of the integrated circuit board along the second direction to clamp the integrated circuit board and the bus metal sheet together.

15. The photovoltaic inverter according to claim 7, characterized in that: The first type of support column, the second type of support column, the base and the connecting piece are an integrally formed structure.

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