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 utility model relates to the technical field of inverter devices, in particular to a photovoltaic inverter.

Background

An inverter is a power conditioner composed of semiconductor devices, and is mainly used for converting direct-current power into alternating-current power, and is generally composed of a boost circuit and an inverter bridge circuit. The boosting circuit boosts the direct-current voltage of the solar battery to the direct-current voltage required by the output control of the inverter; the inverter bridge circuit converts the boosted DC voltage equivalently into AC voltage with common frequency. The photovoltaic inverter provides various perfect power conversion and access schemes for various renewable energy power generation systems such as solar photovoltaic power generation, wind power generation, fuel cell power generation, small hydroelectric power generation and the like, is mainly applied to renewable energy grid-connected power generation systems, off-grid village power supply systems and household power supply systems, and can provide power for regional communication, traffic, street lamp illumination and the like with difficult power grid extension.

At present, the wire-out mode of the PV terminal on the photovoltaic inverter is mainly that the wire is pulled out to be connected to the DC switch after the metal needle of the PV terminal is welded. Meanwhile, in order to solve the radiation problem of the photovoltaic inverter, the outgoing line position of the PV terminal is connected with the capacitor plate in parallel in a line pressing mode to be grounded. In addition, to solve the problem of electromagnetic coupling, the outgoing line of the PV terminal is rewound by a plurality of loops of magnetic rings. However, the wiring between the PV terminals of the current photovoltaic inverter and the capacitor plates is relatively long, and the electromagnetic coupling phenomenon is serious; the mode reliability of the parallel capacitor plates in the line pressing mode is low, and the condition that the PV terminals fall off easily occurs.

Disclosure of Invention

The utility model aims to provide a photovoltaic inverter, which at least solves the problem that the electromagnetic coupling phenomenon of the photovoltaic inverter in the prior art is serious.

According to one aspect of the present utility model, there is provided a photovoltaic inverter comprising:

the shell is provided with an installation cavity;

the capacitor plate is arranged on the side wall of the mounting cavity and is provided with a conductive plug connector;

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, 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 of the main body part, and the plug pin is plugged on the conductive plug connector to be electrically connected with the capacitor plate.

Further, the conductive plug connector comprises an annular main body and positioning pins, wherein the positioning pins are arranged at the end part of the annular main body and are fixedly connected with the capacitor plate;

the inserting needle is inserted into the annular main body to be electrically connected with the capacitor plate.

Further, at least one conductive elastic piece is arranged on the inner side wall of the annular main body and is used for being abutted with the inserting needle.

Further, the conductive elastic piece comprises a metal elastic piece, the metal elastic piece is a convex arc strip, and the convex arc strip protrudes towards the axial direction of the annular main body.

Further, the positioning pins are multiple, and the positioning pins are arranged at intervals along the circumferential direction of the annular main body.

Further, the positioning pins are connected to the capacitor plates in a welding or clamping or fastening mode.

Further, the main body part includes the spliced pole, be provided with the mounting hole in the axial of spliced pole, the grafting needle set up in the mounting hole and protrusion in the tip of spliced pole, be provided with on the casing with the spliced pole looks adaptation's connecting hole.

Further, the connecting column comprises a stud segment, the connecting hole is a threaded hole matched with the stud segment, and the stud segment is detachably arranged in the threaded hole in a penetrating mode and is locked on the shell through a locking nut.

Further, the photovoltaic inverter further comprises a filtering magnetic ring, and the filtering magnetic ring is fixedly arranged on the capacitor plate and is electrically connected with the capacitor plate.

Further, the filter magnetic ring is arranged on the capacitor plate in a welding or clamping or locking mode.

Compared with the prior art, the technical scheme of the utility model has at least the following technical effects:

the PV terminal of the utility model is provided with a plug pin protruding from the main body. When the photovoltaic module is actually installed, the PV terminal is fixed on the shell, and at the moment, the plug pin on the PV terminal can be directly plugged on the conductive plug connector to be electrically connected with the capacitor plate and connected to the direct current switch through the capacitor plate. That is, in the present utility model, by providing the PV terminal with the insertion pin protruding from the end of the main body portion, the insertion pin can be directly inserted and connected with the conductive insertion piece on the capacitor plate inside the installation cavity when the PV terminal is installed on the housing. Therefore, the utility model can omit a connecting wire between the PV terminal and the capacitor plate, and effectively prevent the occurrence of electromagnetic coupling phenomenon.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model. In the drawings:

fig. 1 is a schematic diagram of a partial structure of a photovoltaic inverter according to an embodiment of the present utility model;

fig. 2 is a schematic view of a structure of a photovoltaic inverter according to an embodiment of the present utility model after being partially cut away;

fig. 3 is a schematic view of a structure of a PV terminal according to an embodiment of the present utility model;

fig. 4 is a schematic structural diagram of a conductive plug according to an embodiment of the present utility model;

fig. 5 is a schematic structural diagram of a capacitive plate portion according to an embodiment of the present utility model.

Wherein the above figures include the following reference numerals:

10. a housing; 11. a mounting cavity; 12. a connection hole; 20. a capacitive plate; 21. a conductive plug; 211. an annular body; 212. positioning pins; 213. a conductive elastic member; 30. a DC switch; 40. a wire; 50. a PV terminal; 51. a main body portion; 511. a connecting column; 512. a stud section; 5121. a mounting hole; 52. a plugging needle; 60. a filtering magnetic ring; 70. and (5) locking the nut.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the authorization specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

Referring to fig. 1 to 5, according to an embodiment of the present utility model, a photovoltaic inverter is provided. The photovoltaic inverter includes a housing 10, a capacitive plate 20, a dc switch 30, and PV terminals 50. Here, PV in the PV terminal 50 is abbreviated as photovoltatic, which is a kind of Photovoltaic terminal.

Wherein, be provided with installation cavity 11 on the casing 10, through the effect of this installation cavity 11, be convenient for install structures such as capacitive plate 20 and direct current switch 30. Specifically, a capacitive plate 20 is mounted on the side wall of the mounting cavity 11, which capacitive plate 20 is provided with a conductive plug 21, which conductive plug 21 is intended for plug connection with the PV terminal 50. The dc switch 30 is disposed within the mounting cavity 11 and is electrically connected to the capacitive plate 20 by a wire 40. The PV terminal 50 includes a main body 51 and a plug pin 52 disposed on the main body 51, wherein 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 an end of the main body 51 near the capacitor plate 20, and the plug pin 52 is plugged onto the conductive plug 21 to be electrically connected with the capacitor plate 20 when the photovoltaic inverter is assembled.

As can be seen from the above structure, the PV terminal 50 of the present utility model is provided with the insertion pin 52 protruding from the main body 51. In actual installation, the PV terminal 50 is fixed to the housing 10, and the pins 52 on the PV terminal 50 can be directly plugged onto the conductive plugs 21 to electrically connect with the capacitor plate 20 and connect to the dc switch 30 via the capacitor plate 20. That is, in the present embodiment, by providing the PV terminal 50 with the insertion pin 52 protruding from the end of the main body portion 51, the insertion pin 52 can be directly inserted into the conductive insertion piece 21 on the capacitor plate 20 inside the mounting chamber 11 when the PV terminal 50 is mounted on the housing 10. It can be seen that the connection wires between the PV terminals 50 and the capacitor plates 20 can be omitted in the present embodiment, so as to effectively prevent the occurrence of electromagnetic coupling phenomenon.

In addition, in the embodiment, the electrical connection between the PV terminal 50 and the capacitor plate 20 is realized by adopting the plugging pin 52 and the conductive plug connector 21, so that the wiring process flow can be omitted, the production and the assembly are more convenient, and the production efficiency of the photovoltaic inverter in the embodiment can be improved.

Specifically, the housing 10 in this embodiment may be rectangular, square, cylindrical, or elliptical, and is specifically selected and designed according to the internal structure of the photovoltaic inverter, which is not particularly limited in the present utility model.

Further, the capacitor plate 20 is especially referred to as a Y capacitor plate, i.e., a high voltage ceramic capacitor plate. When in use, the capacitor plate 20 is provided with the grounding end, so that the radiation problem of the photovoltaic inverter can be effectively solved. The capacitor plate 20 is a plate-like structure, which may be a square plate, a rectangular plate, a circular plate, an elliptical plate or other shaped plate, and specifically may be selected and designed according to the size and shape of the mounting cavity 11, and the case of the square capacitor plate 20 is shown in fig. 5 of the present utility model.

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 a connection stud (not shown in the figure), and during actual installation, the capacitor plate 20 is fixedly installed on the connection stud through a screw or the like, so that the structure is simple and the implementation is convenient. Of course, in other embodiments of the present utility model, the capacitor plate 20 may be directly locked to the inner wall of the mounting cavity 11 by a structure such as a rivet, or may be fixed to the inner wall of the mounting cavity 11 by welding or bonding, and any other modification forms within the scope of the present utility model are within the scope of the present utility model.

Referring to fig. 1 to 4, the conductive plug 21 in the present embodiment includes a ring-shaped body 211 and a positioning pin 212, the positioning pin 212 being provided at an end of the ring-shaped body 211 and fixedly connected with the capacitor plate 20; the inserting needle 52 is inserted into the annular main body 211 to be electrically connected with the capacitor plate 20, so that the structure is stable and reliable.

In this embodiment, the positioning pins 212 are provided at the end of the annular main body 211, so that the conductive plug 21 is easily and fixedly connected to the capacitor plate 20. Optionally, the positioning pins 212 and the capacitor plate 20 may be fixedly connected together by welding, may be clamped together by a structure such as a buckle, or may be connected together by a fastener, which is all other modifications within the scope of the present utility model. The fastener in this embodiment may be a fastening screw, a fastening pin, a fastening rivet, or the like, for example.

Further, in order to improve the connection stability and structural strength between the conductive plug 21 and the capacitor plate 20, in this embodiment, the positioning pins 212 are plural, and the positioning pins 212 are disposed at intervals along the circumferential direction of the annular main body 211, so that the annular main body 211 and the capacitor plate 20 can be stably connected together. Illustratively, the positioning pins 212 in this embodiment may be two, three or more, and in fig. 4 in the present utility model, the situation when the positioning pins 212 are four is shown, and in fig. 4, one of the four positioning pins 212 is blocked by the ring-shaped main body 211, which is known to the reader.

In order to further improve the stability and reliability of the connection between the connection pin 52 and the conductive connector 21 in the present embodiment, at least one conductive elastic member 213 is disposed on the inner sidewall of the annular main body 211 in the present embodiment, and the conductive elastic member 213 is electrically connected to the capacitor plate 20, and the conductive elastic member 213 is used for abutting against the connection pin 52. Thus, when the plug pin 52 is plugged into the annular main body 211, the conductive elastic member 213 can be abutted against the outer circumferential surface of the plug pin 52, so that the contact stability and reliability of the plug pin 52 and the conductive plug member 21 can be improved, and poor contact between the PV terminal 50 and the capacitor plate 20 is not easy to occur. Alternatively, the conductive elastic member 213 in the present embodiment may be provided as one, two, or more than two. When the conductive elastic members 213 are provided in two or more, the two or more conductive elastic members 213 are provided at intervals along the circumferential direction of the inner wall surface of the annular main body 211, so that they can be well abutted against the insertion needle 52.

Illustratively, the conductive elastic member 213 in the present embodiment includes a metal elastic sheet, which is a convex arc strip protruding toward the axial direction of the annular main body 211, so that when the insertion needle 52 is inserted into the annular main body 211, the protruding portion of the convex arc strip will abut against the insertion needle 52 to effectively and tightly contact with the insertion needle 52, which is simple in structure, stable and reliable. Of course, in other embodiments of the present utility model, the metal spring may be provided in a corrugated strip shape, so long as it is ensured that the insertion needle 52 can abut against the insertion needle 52 when inserted into the annular main body 211.

As shown in fig. 1 to 4, the main body 51 of the PV terminal 50 in the present embodiment includes a connection post 511, a mounting hole 5121 is provided in the axial direction of the connection post 511, and a plug pin 52 is provided in the mounting hole 5121 at the time of actual processing such that the end of the plug pin 52 protrudes from the end of the connection post 511. Correspondingly, the housing 10 is provided with a connection hole 12 adapted to the connection post 511. When the photovoltaic inverter is assembled, the connecting column 511 of the PV terminal 50 is installed in the connecting hole 12, and at the moment, the inserting needle 52 extending from the installation hole 5121 can extend into the installation cavity 11 to be inserted into the conductive inserting piece 21 on the capacitor plate 20.

Illustratively, the PIN 52 in the present embodiment is a PIN, which is made of tungsten carbide, and the tungsten carbide is a hard alloy, and has high hardness, strength, wear resistance and corrosion resistance, so that the service life of the photovoltaic inverter in the present embodiment can be improved.

Further, the connecting post 511 in the present embodiment includes a stud segment 512, and the connecting hole 12 is configured as a threaded hole adapted to the stud segment 512 during actual processing. When the photovoltaic inverter is assembled, the PV terminal 50 is detachably penetrated in the threaded hole through the stud segment 512 and is locked through the locking nut 70, and the PV terminal 50 can be locked and fixed on the shell 10 of the photovoltaic inverter under the action of the locking nut 70, so that the structure is stable and reliable, and the phenomenon that the inserting needle 52 is withdrawn is difficult to occur.

Of course, in other embodiments of the present utility model, the PV terminal 50 may be fixed to the housing 10 by a snap-fit structure, welding, rivet riveting, or the like, and any other modification within the spirit of the present utility model is within the scope of the present utility model.

Referring again to fig. 1 to 5, the photovoltaic inverter of the present embodiment further includes a filter magnetic ring 60, and the filter magnetic ring 60 is fixedly mounted on the capacitor plate 20 and electrically connected to the capacitor plate 20. In this embodiment, the filter magnetic ring 60 is fixedly mounted on the capacitor plate 20, and the corresponding circuit connection is completed on the capacitor plate 20, so that the outgoing line of the PV terminal 50 bypasses the filter magnetic ring 60 and is connected to the dc switch 30. That is, in the present embodiment, the filter magnet ring 60 is fixedly mounted on the capacitor plate 20, so that the arrangement of the connecting wires can be further shortened, and the problem of electromagnetic coupling of the photovoltaic inverter can be further solved. Meanwhile, the filter magnetic ring 60 is fixedly arranged on the capacitor plate 20, so that the wiring process flow of the filter magnetic ring 60 and other structures in the production process of the photovoltaic inverter can be omitted, and the production efficiency of the photovoltaic inverter in the embodiment can be further improved.

Specifically, in this embodiment, the number of the filtering magnetic rings 60 is plural, for example, three, and the three filtering magnetic rings 60 respectively correspond to three routes of the photovoltaic inverter, so that the electromagnetic coupling phenomenon of the photovoltaic inverter can be well prevented. Of course, in other embodiments of the present utility model, the filter magnetic ring 60 may be provided as one, and is specifically selected according to the circuit design on the capacitor board 20 of the photovoltaic inverter, which is not limited in the present utility model.

Further, in the actual production process, the filter magnetic ring 60 is mounted on the capacitor plate 20 in a welding manner, and also can be mounted on the capacitor plate 20 through a clamping or locking piece, so that the structure is simple, and the processing and the production are convenient. The locking member in this embodiment may be a locking screw, a locking pin, or a locking rivet, and other modifications are within the scope of the present utility model.

According to the above structure, in the actual production process, the filter magnetic ring 60 and the wiring harness thereon can be directly installed on the capacitor plate 20 as a module structure and electrically connected with the circuit on the capacitor plate 20, so that the winding process in the assembly process of the photovoltaic inverter can be reduced, the design process of the photovoltaic inverter can be shortened, the production cost of the photovoltaic inverter can be reduced, and the production efficiency of the photovoltaic inverter can be improved.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.

The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. A photovoltaic inverter, comprising:

a housing (10), wherein a mounting cavity (11) is arranged on the housing (10);

a capacitor plate (20), wherein the capacitor plate (20) is arranged on the side wall of the mounting cavity (11), and a conductive plug connector (21) is arranged on the capacitor plate (20);

a direct current switch (30), wherein the direct current switch (30) is arranged in the installation cavity (11) and is electrically connected with the capacitor plate (20) through a lead wire (40);

the PV terminal (50), PV terminal (50) include main part (51) and grafting needle (52), main part (51) are fixed to be set up on casing (10), grafting needle (52) set up on main part (51) and protrusion in main part (51) are close to the tip of electric capacity board (20), grafting needle (52) peg graft in on electrically conductive plug connector (21) in order to be connected with electric capacity board (20).

2. The photovoltaic inverter according to claim 1, characterized in that the conductive plug (21) comprises an annular body (211) and positioning pins (212), the positioning pins (212) being arranged at the ends of the annular body (211) and being fixedly connected with the capacitive plates (20);

the inserting needle (52) is inserted into the annular main body (211) so as to be electrically connected with 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 side wall of the annular body (211), said conductive elastic member (213) being adapted to abut with the plugging pin (52).

4. A photovoltaic inverter according to claim 3, characterized in that the conductive elastic member (213) comprises a metal spring sheet, which is a convex arc strip protruding towards the axial direction of the annular body (211).

5. The photovoltaic inverter according to claim 2, wherein the plurality of positioning pins (212) is provided, the plurality of positioning pins (212) being arranged at intervals along the circumference of the annular body (211).

6. The photovoltaic inverter of claim 2, wherein the positioning pins (212) are connected to the capacitive plates (20) by welding or snap-fit or fastener connection.

7. The photovoltaic inverter according to claim 1, characterized in that the main body (51) comprises a connecting column (511), a mounting hole (5121) is arranged in the axial direction of the connecting column (511), the plugging pin (52) is arranged in the mounting hole (5121) and protrudes out of the end part of the connecting column (511), and a connecting hole (12) matched with the connecting column (511) is arranged on the shell (10).

8. The photovoltaic inverter of claim 7, wherein the connection post (511) comprises a stud segment (512), the connection hole (12) is a threaded hole matched with the stud segment (512), and the stud segment (512) is detachably penetrated in the threaded hole and locked on the shell (10) through a locking nut (70).

9. The photovoltaic inverter of any one of claims 1 to 8 further comprising a filter magnet ring (60), the filter magnet ring (60) being fixedly mounted on the capacitive plate (20) and electrically connected to the capacitive plate (20).

10. The photovoltaic inverter according to claim 9, characterized in that the filter magnet ring (60) is mounted on the capacitive plate (20) by means of welding or clamping or locking.