CN219760020U - Photovoltaic inverter - Google Patents

Abstract

The utility model discloses a photovoltaic inverter. The photovoltaic inverter includes a housing, a capacitive plate, a dc switch, and PV terminals. The shell is provided with an installation cavity; the capacitor plate is arranged on the side wall of the mounting cavity, and a conductive plug connector is arranged on the capacitor plate; the direct current switch is arranged in the mounting cavity and is electrically connected with the capacitor plate through a wire; the PV terminal comprises a main body part and a plug pin, wherein the main body part is fixedly arranged on the shell, the plug pin is arranged on the main body part and protrudes out of the end part, close to the capacitor plate, of the main body part, and the plug pin is plugged on the conductive plug connector to be electrically connected with the capacitor plate. The photovoltaic inverter can solve the problem that the electromagnetic coupling phenomenon of the photovoltaic inverter in the prior art is serious.

Description

Photovoltaic inverter

Technical field

The present application relates to the technical field of inverter devices, specifically, to a photovoltaic inverter.

Background technique

An inverter is a power regulating device composed of semiconductor devices. It is mainly used to convert DC power into AC power. It is generally composed of a boost circuit and an inverter bridge circuit. The boost circuit boosts the DC voltage of the solar cell to the DC voltage required for inverter output control; the inverter bridge circuit equivalently converts the boosted DC voltage into an AC voltage of common frequency. Photovoltaic inverters provide various perfect power conversion and access solutions for various renewable energy power generation systems such as solar photovoltaic power generation, wind power generation, fuel cell power generation, small hydropower generation, etc., and are mainly used in renewable energy grid-connected power generation systems, Off-grid village power supply systems and household power systems can also provide power for communications, transportation, street lighting, etc. in areas where power grid extension is difficult.

At present, the PV terminal outlet method on the photovoltaic inverter is mainly to weld the metal pin of the PV terminal and then pull it out to connect to the DC switch. At the same time, in order to solve the radiation problem of the photovoltaic inverter, the capacitor plate will be connected in parallel to the ground through a crimping method at the outlet of the PV terminal. In addition, in order to solve the problem of electromagnetic coupling, several turns of magnetic rings will be wound around the outlet of the PV terminal. However, the wiring between the PV terminals and the capacitor board of the current photovoltaic inverter is relatively long, and the electromagnetic coupling phenomenon is serious; the parallel connection of the capacitor board by pressing the wire is low in reliability, and the PV terminal is prone to falling off.

Utility model content

The main purpose of this application is to provide a photovoltaic inverter to at least solve the serious problem of electromagnetic coupling phenomenon in photovoltaic inverters in the prior art.

According to one aspect of the present application, a photovoltaic inverter is provided, including:

A housing with an installation cavity provided on the housing;

A capacitor plate, which is installed on the side wall of the installation cavity, and a conductive plug connector is provided on the capacitor plate;

A DC switch, which is arranged in the installation cavity and is electrically connected to the capacitor plate through wires;

PV terminal, the PV terminal includes a main body part and a plug pin, the main body part is fixedly provided on the housing, the plug pin is provided on the main body part and protrudes from the end of the main body part. part, the plug pin is plugged into the conductive plug connector to electrically connect with the capacitor plate.

Further, the conductive plug connector includes an annular body and a positioning pin, the positioning pin is provided at an end of the annular body and is fixedly connected to the capacitor plate;

The plug pins are plugged into the annular body to be electrically connected to the capacitor plate.

Further, at least one conductive elastic piece is provided on the inner wall of the annular body, and the conductive elastic piece is used to abut the insertion pin.

Further, the conductive elastic member includes a metal elastic piece, the metal elastic piece is a convex arc strip, and the convex arc strip protrudes toward the axis direction of the annular body.

Further, there are a plurality of positioning pins, and the plurality of positioning pins are arranged at intervals along the circumference of the annular body.

Further, the positioning pins are connected to the capacitor plate by welding or clamping or fastener connection.

Further, the main body part includes a connecting column, a mounting hole is provided in the axial direction of the connecting column, the plug pin is disposed in the mounting hole and protrudes from the end of the connecting column, and the The housing is provided with connection holes that match the connection posts.

Further, the connecting column includes a stud section, and the connecting hole is a threaded hole that matches the stud section. The stud section is detachably inserted into the threaded hole and locked by a locking nut. tight on the casing.

Further, the photovoltaic inverter further includes a filter magnetic ring, which is fixedly installed on the capacitor plate and electrically connected to the capacitor plate.

Further, the filter magnetic ring is installed on the capacitor plate by welding, snapping or locking.

Compared with the existing technology, the technical solution of this application at least has the following technical effects:

The PV terminal of the present application is provided with plug pins protruding from the main body. During actual installation, the PV terminal is fixed on the casing. At this time, the plug pins on the PV terminal can be directly plugged into the conductive plug connector to achieve electrical connection with the capacitor plate and connect to the DC switch through the capacitor plate. . That is to say, in this application, the PV terminal is provided with a plug-in pin protruding from the end of the main body. In this way, when the PV terminal is installed on the housing, the plug-in pin can be directly connected to the installation cavity. The conductive plug-in connectors on the internal capacitor plate are plugged into each other. It can be seen that this application can omit the connecting wire between the PV terminal and the capacitor plate, effectively preventing the occurrence of electromagnetic coupling.

Description of the drawings

The drawings described here are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the attached picture:

Figure 1 is a partial structural schematic diagram of the photovoltaic inverter disclosed in the embodiment of the present application;

Figure 2 is a partially cutaway structural schematic diagram of the photovoltaic inverter disclosed in the embodiment of the present application;

Figure 3 is a schematic structural diagram of a PV terminal disclosed in the embodiment of the present application;

Figure 4 is a schematic structural diagram of the conductive plug connector disclosed in the embodiment of the present application;

FIG. 5 is a schematic structural diagram of the capacitor plate part disclosed in the embodiment of the present application.

Among them, the above-mentioned drawings include the following reference signs:

10. Shell; 11. Installation cavity; 12. Connection hole; 20. Capacitor plate; 21. Conductive connector; 211. Ring-shaped body; 212. Positioning pin; 213. Conductive elastic member; 30. DC switch; 40 , Wire; 50, PV terminal; 51, main body; 511, connecting column; 512, stud section; 5121, mounting hole; 52, plug pin; 60, filter magnetic ring; 70, locking nut.

Detailed ways

It should be noted that, as long as there is no conflict, the embodiments and features in the embodiments of this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular forms are also intended to include the plural forms unless the context clearly indicates otherwise. Furthermore, it will be understood that when the terms "comprises" and/or "includes" are used in this specification, they indicate There are features, steps, operations, means, components and/or combinations thereof.

The relative arrangement of components and steps, numerical expressions, and numerical values set forth in these examples do not limit the scope of the application unless specifically stated otherwise. At the same time, it should be understood that, for convenience of description, the dimensions of various parts shown in the drawings are not drawn according to actual proportional relationships. Techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered part of the authorized specification. In all examples shown and discussed herein, any specific values are to be construed as illustrative only and not as limiting. Accordingly, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters refer to similar items in the following figures, so that once an item is defined in one figure, it does not need further discussion in subsequent figures.

Referring to FIGS. 1 to 5 , according to embodiments of the present application, a photovoltaic inverter is provided. The photovoltaic inverter includes a housing 10 , a capacitor plate 20 , a DC switch 30 and a PV terminal 50 . It should be noted that the PV in the PV terminal 50 here is the abbreviation of Photovoltaic, which is a kind of photovoltaic terminal.

The housing 10 is provided with an installation cavity 11, which facilitates the installation of structures such as the capacitor plate 20 and the DC switch 30. Specifically, the capacitor plate 20 is installed on the side wall of the installation cavity 11 , and a conductive plug connector 21 is provided on the capacitor plate 20 . The conductive plug connector 21 is used for plug-in connection with the PV terminal 50 . The DC switch 30 is disposed in the installation cavity 11 and is electrically connected to the capacitor plate 20 through wires 40 . The PV terminal 50 includes a main body 51 and a plug pin 52 disposed on the main body 51 . The main body 51 is fixedly disposed on the housing 10 . The plug pin 52 is disposed on the main body 51 and protrudes from the main body 51 . Near the end of the capacitor plate 20 , when the photovoltaic inverter is assembled, the plug pin 52 is plugged into the conductive plug connector 21 to be electrically connected to the capacitor plate 20 .

It can be known from the above structure that the PV terminal 50 of the present application is provided with plug pins 52 protruding from the main body 51 . During actual installation, the PV terminal 50 is fixed on the housing 10. At this time, the plug pin 52 on the PV terminal 50 can be directly plugged into the conductive plug connector 21 to achieve electrical connection with the capacitor plate 20, and through Capacitive plate 20 is connected to DC switch 30 . That is to say, in this embodiment, the PV terminal 50 is provided with the plug pin 52 protruding from the end of the main body 51. In this way, when the PV terminal 50 is installed on the housing 10, the plug pin 52 is The pin 52 can be directly connected to the conductive plug connector 21 on the capacitor plate 20 inside the installation cavity 11 . It can be seen that in this embodiment, the connecting wire between the PV terminal 50 and the capacitor plate 20 can be omitted, effectively preventing the occurrence of electromagnetic coupling.

In addition, this embodiment uses the plug pin 52 and the conductive plug connector 21 to realize the electrical connection between the PV terminal 50 and the capacitor plate 20, which can save the wiring process, is more convenient for production and assembly, and can improve the photovoltaic performance in this embodiment. Inverter production efficiency.

Specifically, the housing 10 in this embodiment can be arranged in the shape of a rectangular parallelepiped, or can be arranged in the shape of a cube, a cylinder, or an elliptical body. The selection and design are specifically based on the internal structure of the photovoltaic inverter, which is not specifically limited in this application. .

Furthermore, the capacitor plate 20 specifically refers to a Y capacitor plate, that is, a high-voltage ceramic capacitor plate. When in use, the capacitor plate 20 is provided with a ground terminal, which can effectively solve the radiation problem of the photovoltaic inverter. The capacitor plate 20 is a plate-like structure. The plate-like structure can be a square plate, a rectangular plate, a circular plate, an oval plate or other special-shaped plates. The specific selection and design can be based on the size and shape of the installation cavity 11. This Figure 5 of the application shows the situation when the capacitor plate 20 is arranged in a square shape.

In order to facilitate the installation of the capacitor plate 20, the inner wall of the installation cavity 11 in this embodiment is provided with connecting studs (not shown in the figure). During actual installation, the capacitive plate 20 is fixedly installed on the connecting studs through screws, etc. The structure is simple and easy to implement. Of course, in other embodiments of the present application, the capacitor plate 20 can also be directly locked on the inner wall of the installation cavity 11 through rivets or other structures, or can also be fixed on the inner wall of the installation cavity 11 through welding or bonding. As long as there are other modifications under the concept of this application, they are all within the protection scope of this application.

Referring to Figures 1 to 4, the conductive plug connector 21 in this embodiment includes an annular body 211 and a positioning pin 212. The positioning pin 212 is provided at the end of the annular body 211 and is fixedly connected to the capacitor plate 20; The plug pin 52 is plugged into the inside of the annular body 211 to achieve electrical connection with the capacitor plate 20, and the structure is stable and reliable.

In this embodiment, positioning pins 212 are provided at the ends of the annular body 211 to facilitate the fixed connection of the conductive plug connector 21 to the capacitor plate 20 . Optionally, the positioning pin 212 and the capacitor plate 20 can be fixedly connected together by welding, snap-fastened together by buckles or other structures, or connected together by fasteners, as long as they are in Other modifications based on the concept of this application are within the protection scope of this application. For example, the fasteners in this embodiment may be fastening screws, fastening pins, fastening rivets and other structures.

Furthermore, in order to improve the connection stability and structural strength of the conductive plug connector 21 and the capacitor plate 20 , in this embodiment, there are multiple positioning pins 212 , and the plurality of positioning pins 212 are spaced along the circumference of the annular body 211 The annular body 211 and the capacitor plate 20 can be stably connected together. For example, the number of positioning pins 212 in this embodiment can be set to two, three, or more than three. Figure 4 of this application shows the situation when the number of positioning pins 212 is four. In Figure 4, one of the four positioning pins 212 is blocked by the annular body 211, please be aware of this.

In order to further improve the insertion stability and reliability between the plug pin 52 and the conductive plug connector 21 in this embodiment, at least one conductive elastic member 213 is provided on the inner wall of the annular body 211 in this embodiment. The conductive elastic member 213 is electrically connected to the capacitor plate 20 , and the conductive elastic member 213 is used to contact the plug pin 52 . With this arrangement, when the insertion pin 52 is inserted into the annular body 211 , the conductive elastic member 213 can contact the outer peripheral surface of the insertion pin 52 , which can improve the contact stability between the insertion pin 52 and the conductive plug connector 21 and reliability, poor contact between the PV terminal 50 and the capacitor plate 20 is unlikely to occur. Optionally, the number of conductive elastic members 213 in this embodiment may be one, two, or more than two. When two or more conductive elastic members 213 are provided, the two or more conductive elastic members 213 are arranged at circumferential intervals along the inner wall surface of the annular body 211 and can well resist the insertion pin. 52 on.

Illustratively, the conductive elastic member 213 in this embodiment includes a metal elastic piece, which is a convex arc strip, and the convex arc strip protrudes toward the axis direction of the annular body 211. In this way, when the insertion pin 52 is inserted into When inside the annular body 211, the convex part of the convex arc bar will press against the plug pin 52 to effectively and closely contact the plug pin 52. The structure is simple, stable and reliable. Of course, in other embodiments of the present application, the metal elastic piece can also be arranged in a corrugated strip shape, and it only needs to be ensured that the plug pin 52 can abut the plug pin 52 when inserted into the annular body 211 .

As shown in FIGS. 1 to 4 , the main body 51 of the PV terminal 50 in this embodiment includes a connecting post 511 , and a mounting hole 5121 is provided in the axial direction of the connecting post 511 . During actual processing, the plug pin 52 is set In the mounting hole 5121, the end of the plug pin 52 protrudes from the end of the connecting post 511. Correspondingly, the housing 10 is provided with a connection hole 12 that matches the connection post 511 . When assembling the photovoltaic inverter, the connecting posts 511 of the PV terminals 50 are installed in the connecting holes 12. At this time, the plug pins 52 protruding from the mounting holes 5121 can extend into the mounting cavity 11 and the capacitor plate 20 The photovoltaic inverter has a simple structure and is easy to assemble.

Illustratively, the plug pin 52 in this embodiment is a PIN pin, and the material of the PIN pin is tungsten carbide. Tungsten carbide is a hard alloy with high hardness, strength, wear resistance and corrosion resistance. The service life of the photovoltaic inverter in this embodiment can be improved.

Furthermore, the connecting column 511 in this embodiment includes a stud section 512. During actual processing, the connecting hole 12 is set as a threaded hole that matches the stud section 512. When assembling the photovoltaic inverter, the PV terminal 50 is detachably inserted into the threaded hole through the stud section 512 and locked through the locking nut 70. Through the function of the locking nut 70, the PV terminal 50 can be locked and fixed. The housing 10 of the photovoltaic inverter has a stable and reliable structure, and it is not easy for the plug pins 52 to withdraw.

Of course, in other embodiments of the present application, the PV terminal 50 can also be fixed on the casing 10 through a buckle structure, welding, or rivet riveting. As long as it is other deformation methods under the concept of the present application, all are applicable. within the protection scope of this application.

As shown in FIGS. 1 to 5 again, the photovoltaic inverter in this embodiment also includes a filter magnetic ring 60 . The filter magnetic ring 60 is fixedly installed on the capacitor plate 20 and is electrically connected to the capacitor plate 20 . In this embodiment, by fixing the filter magnetic ring 60 on the capacitor plate 20 and completing the corresponding circuit connection on the capacitor plate 20, the outlet wire of the PV terminal 50 can be wound around the filter magnetic ring 60 and then connected to the DC Switch 30. That is to say, in this embodiment, the filter magnetic ring 60 is fixedly installed on the capacitor plate 20, which can further shorten the arrangement of the connecting wires and further solve the problem of electromagnetic coupling of the photovoltaic inverter. At the same time, the fixed installation of the filter magnetic ring 60 on the capacitor plate 20 can also save the wiring process of the filter magnetic ring 60 and other structures in the production process of the photovoltaic inverter, which can further improve the photovoltaic performance in this embodiment. The production efficiency of the inverter.

Specifically, there are multiple filter magnetic rings 60 in this embodiment, such as three. The three filter magnetic rings 60 respectively correspond to the three circuits of the photovoltaic inverter, which can well prevent the photovoltaic inverter from electromagnetic interference. coupling phenomenon. Of course, in other embodiments of the present application, the number of filter magnetic rings 60 can also be provided, and the selection is specifically based on the circuit design on the capacitor plate 20 of the photovoltaic inverter, which is not specifically limited in this application.

Furthermore, in the actual production process, the filter magnetic ring 60 is installed on the capacitor plate 20 in a weldable manner, and can also be installed on the capacitor plate 20 through clamping or locking parts. The structure is simple and facilitates processing and production. For example, the locking member in this embodiment may be a locking screw, a locking pin, or a locking rivet. Any other modifications based on the concept of the present application are within the scope of the present application.

According to the above structure, it can be seen that using the structure in this embodiment, in the actual production process, the filter magnetic ring 60 and the wiring harness on it can be directly installed on the capacitor plate 20 as a module structure and implemented with the circuit on the capacitor plate 20 Electrical connection, in this way, can reduce the winding process during the assembly process of the photovoltaic inverter, shorten the design process of the photovoltaic inverter, reduce the production cost of the photovoltaic inverter, and improve the production efficiency of the photovoltaic inverter.

For the convenience of description, spatially relative terms can be used here, such as "on...", "on...", "on the upper surface of...", "above", etc., to describe what is shown in the figure. The spatial relationship between one device or feature and other devices or features. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a feature in the figure is turned upside down, then one feature described as "above" or "on top of" other features or features would then be oriented "below" or "below" the other features or features. under other devices or structures". Thus, the exemplary term "over" may include both orientations "above" and "below." The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, it should be noted that the use of words such as "first" and "second" to define parts is only to facilitate the distinction between corresponding parts. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood. To limit the scope of protection of this application.

The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included in the protection scope of this application.

Claims (10)

1. A photovoltaic inverter, characterized by comprising: Housing (10), the housing (10) is provided with an installation cavity (11); Capacitor plate (20), the capacitor plate (20) is installed on the side wall of the installation cavity (11), and a conductive plug connector (21) is provided on the capacitor plate (20); DC switch (30), the DC switch (30) is arranged in the installation cavity (11) and is electrically connected to the capacitor plate (20) through a wire (40); PV terminal (50). The PV terminal (50) includes a main body (51) and a plug pin (52). The main body (51) is fixedly arranged on the housing (10). The plug pin A pin (52) is provided on the main body (51) and protrudes from an end of the main body (51) close to the capacitor plate (20). The plug pin (52) is plugged into the The conductive plug connector (21) is electrically connected to the capacitor plate (20). 2. The photovoltaic inverter according to claim 1, characterized in that the conductive plug connector (21) includes an annular body (211) and a positioning pin (212), and the positioning pin (212) is configured At the end of the annular body (211) and fixedly connected with the capacitor plate (20); The plug pin (52) is inserted inside the annular body (211) to be electrically connected to the capacitor plate (20). 3. The photovoltaic inverter according to claim 2, characterized in that at least one conductive elastic member (213) is provided on the inner wall of the annular body (211), and the conductive elastic member (213) is used for Contact with the plug pin (52). 4. The photovoltaic inverter according to claim 3, characterized in that the conductive elastic member (213) includes a metal elastic piece, the metal elastic piece is a convex arc strip, and the convex arc strip faces the annular body ( 211) is convex in the axis direction. 5. The photovoltaic inverter according to claim 2, characterized in that there are multiple positioning pins (212), and the plurality of positioning pins (212) are along the circumference of the annular body (211). Interval setting. 6. The photovoltaic inverter according to claim 2, characterized in that the positioning pin (212) is connected to the capacitor plate (20) by welding, snapping or fastener connection. 7. The photovoltaic inverter according to claim 1, characterized in that the main body (51) includes a connecting column (511), and a mounting hole (5121) is provided in the axial direction of the connecting column (511). , the plug pin (52) is provided in the mounting hole (5121) and protrudes from the end of the connecting post (511), and the housing (10) is provided with a connection pin (512) connected to the connecting post (511). 511) matching connection hole (12). 8. The photovoltaic inverter according to claim 7, characterized in that the connecting post (511) includes a stud section (512), and the connecting hole (12) is connected to the stud section (512). Matching threaded holes, the stud section (512) is detachably inserted into the threaded hole and locked on the housing (10) through the locking nut (70). 9. The photovoltaic inverter according to any one of claims 1 to 8, characterized in that the photovoltaic inverter further includes a filter magnetic ring (60), and the filter magnetic ring (60) is fixedly installed on On the capacitor plate (20) and electrically connected with the capacitor plate (20). 10. The photovoltaic inverter according to claim 9, characterized in that the filter magnetic ring (60) is installed on the capacitor plate (20) by welding, clamping or locking.