Photovoltaic inverter and photovoltaic system

Abstract

The utility model discloses a photovoltaic inverter and a photovoltaic system, the photovoltaic inverter comprises a box body, a power circuit board and a control circuit board, the power circuit board is arranged in the box body, the photovoltaic inverter also comprises a control cover, the box body is provided with a window communicated with the inner cavity of the box body, and the control cover is arranged on the box body. The power circuit board is provided with a window, the control cover is connected to the box body and covers the outer side of the window, the control circuit board is connected in the control cover, the control circuit board is electrically connected with the power circuit board through a cable, and the cable penetrates through the window. The photovoltaic inverter provided by the utility model is convenient to disassemble and maintain on site and low in maintenance cost.

Description

Technical Field

[0001] The utility model belongs to the field of electric power equipment, and in particular relates to a photovoltaic inverter and a photovoltaic system. Background Art

[0002] A photovoltaic inverter is a power conversion device that converts the direct current (DC) electricity generated by photovoltaic panels into alternating current (AC). Currently, the control circuit board that receives the DC power from the panels is typically located inside the inverter housing, secured to the enclosure using fasteners such as nuts.

[0003] During use, poor contact during wiring can easily cause the control circuit board inside the box to short-circuit and spark, requiring replacement. However, since it is located inside the box, there is high voltage in the box, which poses a great risk of electric shock to people. In addition, most inverter manufacturers do not allow the box to be opened on site. If the photovoltaic inverter needs to be transported to after-sales service for repair, the repair cost is high and disassembly is also inconvenient. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a photovoltaic inverter and a photovoltaic system, which are convenient for on-site disassembly and maintenance and have low maintenance costs.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A photovoltaic inverter includes a housing, a power circuit board, and a control circuit board. The power circuit board is disposed in the housing. The photovoltaic inverter also includes a control cover. The housing is provided with a window communicating with an inner cavity of the housing. The control cover is connected to the housing and covers the outside of the window. The control circuit board is connected within the control cover. The control circuit board is electrically connected to the power circuit board via a cable, and the cable passes through the window.

[0007] In a preferred embodiment, the box body has a front panel, a back panel, and a side panel disposed between the front panel and the back panel, and the window is opened on the side panel of the box body.

[0008] In a preferred embodiment, the control cover has a cavity, and the control circuit board is disposed in the cavity; the open end of the control cover is correspondingly connected to the side panel of the box.

[0009] In a preferred embodiment, the control cover and the side panels of the box body are fixedly connected by a plurality of fasteners. When the control circuit board needs to be repaired, only the fasteners need to be removed, which is more convenient to use.

[0010] In a preferred embodiment, a sealing strip is provided between the control cover and the box body, and the sealing strip can achieve IP65 or higher waterproof and dustproof properties.

[0011] In a preferred embodiment, a plurality of positioning holes are provided in the control cover, and the control circuit board is fixed at the positioning holes by a plurality of fasteners.

[0012] In a preferred embodiment, the photovoltaic inverter further includes a switch disposed in the box, one end of the switch is connected to the control circuit board, and the other end of the switch is connected to the power circuit board.

[0013] In a preferred embodiment, the number of the control circuit boards in the cavity is several, and the number of the control circuit boards can be one or more depending on actual use.

[0014] In a more preferred embodiment, a cable tie is provided on the control cover, and the cable on the control circuit board passes through the cable tie and is connected to the switch.

[0015] The utility model also adopts the following technical solutions:

[0016] A photovoltaic system includes a photovoltaic assembly, characterized in that the photovoltaic system also includes the above-mentioned photovoltaic inverter, and the photovoltaic assembly is electrically connected to a control circuit board of the photovoltaic inverter.

[0017] The present invention adopts the above solution, which has the following advantages compared with the prior art:

[0018] In the photovoltaic inverter of the present invention, the control circuit board is arranged on the outside of the box. If the control circuit board catches fire or is damaged, it is only necessary to remove the control cover after turning off the power. At this time, the control circuit board will be separated from the box along with the control cover, and only the cables are connected to the control circuit board. The disassembly is relatively convenient and the repair or on-site maintenance of the control circuit board is also convenient. In addition, the control circuit board is arranged outside the box to prevent the fire from spreading inside. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 is a schematic diagram of a photovoltaic inverter according to an embodiment of the present invention;

[0021] Figure 2 is another schematic diagram of a photovoltaic inverter according to an embodiment of the present utility model;

[0022] Figure 3 A perspective view of the control cover.

[0023] in,

[0024] 100. Photovoltaic inverter;

[0025] 1. Control circuit board;

[0026] 2. Power circuit board;

[0027] 3. Cable; 4. Box; 41. Panel; 5. Control cover; 51. Cavity; 52. Open end; 53. Positioning hole; 6. Sealing strip; 7. Fastener; 8. Cable tie; 9. Switch. DETAILED DESCRIPTION

[0028] The following describes in detail preferred embodiments of the present invention in conjunction with the accompanying drawings to make the advantages and features of the present invention more easily understood by those skilled in the art. It should be noted that the description of these embodiments is intended to facilitate understanding of the present invention and does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0029] This embodiment provides a photovoltaic system including a photovoltaic module and a photovoltaic inverter, wherein the photovoltaic module and the photovoltaic inverter's control circuit board are electrically connected. The control circuit board plays a core role in the photovoltaic inverter, ensuring the inverter's efficient and stable operation.

[0030] Specifically, the application of control circuit boards in photovoltaic inverters mainly includes the following aspects: (1) Current conversion and control: The circuit design and component layout on the control circuit board ensure that direct current can be efficiently and stably converted into alternating current, while achieving precise control of current and voltage; (2) Signal processing: The high-performance processors and sensors on the control circuit board monitor and process the current and voltage signals from the solar panels and the status information of the power grid in real time to ensure that the inverter can respond quickly; (3) Protection and safety functions: The control circuit board integrates multiple mechanisms such as overcurrent protection, overvoltage protection, and overheating protection to ensure that the inverter can shut down safely under abnormal conditions to prevent equipment damage or safety accidents.

[0031] The photovoltaic inverter also includes a power circuit board installed inside the photovoltaic inverter box. The direct current of the photovoltaic module enters the power circuit board through the control circuit board and is converted into alternating current, which can be fed back to the commercial power transmission system or used for off-grid power grids.

[0032] Reference Figures 1 to 3As shown, the photovoltaic inverter of this embodiment includes a housing 4, a power circuit board 2, a control cover 5, a control circuit board 1, and a switch 9. The switch 9 and the power circuit board 2 are disposed within the housing 4, and the control circuit board 1 is disposed within the control cover 5. The housing 4 includes a panel 41, which encloses the housing 4 to form an inner cavity. The housing 4 is provided with a window communicating with the inner cavity. The control cover 5 is connected to the housing 4 and covers the outer side of the window. The control circuit board 1 is connected within the control cover 5.

[0033] Furthermore, the housing 4 includes a back panel and side panels disposed between the front panel 41 and the back panel. A window is provided in the side panel of the housing 4. Specifically, the control cover 5 is disposed on the side panel of the housing 4. Specifically, the control cover 5 is fixedly connected to the side panel of the housing 4. Furthermore, the control cover 5 has an open end 52, which is correspondingly connected to the side panel of the housing 4. Specifically, the open end 52 and the side panel of the housing 4 are fixedly connected by a plurality of fasteners 7, which are screws. When maintenance is required, only the screws need to be removed, which is time-saving and labor-saving.

[0034] The control circuit board 1 in the control cover 5 is connected to the power circuit board 2 via a cable 3, specifically, the cable 3 passes through a window. The control circuit board 1 is arranged outside the box body 4, which avoids the need to remove the panel 41 of the box body 4 during maintenance, making maintenance more convenient. In addition, in the prior art, in order to isolate the control circuit board from the communication terminals (such as Wi-Fi, etc.) and avoid affecting the signal, a shielding cover is usually provided on the control circuit board inside the box body 4 to isolate the signal. In this embodiment, the control circuit board is arranged outside the box body and isolated from the communication terminals, eliminating the need for an additional shielding cover.

[0035] The control cover 5 has a cavity 51, and the control circuit board 1 is arranged in the cavity 51. There are several control circuit boards 1 in the cavity 51. The number of control circuit boards 1 can be set according to the actual use situation, and can be one or more. Specifically in this embodiment, there are two control circuit boards 1. There are also multiple control covers 5. Specifically in this embodiment, there are also two control covers 5. The control circuit board 1 is arranged in an independent cavity 51, which is not only convenient for disassembly and maintenance, but also can prevent the fire from spreading inside and causing greater losses. Figure 3 As shown, a sealing strip 6 is provided between the control cover 5 and the housing 4, achieving a waterproof and dustproof rating of IP65 or higher. Furthermore, multiple positioning holes 53 are provided within the control cover 5. When installing the control circuit board 1, the control circuit board 1 is positioned through the positioning holes 53 and secured to the positioning holes 53 using multiple fasteners, specifically screws. To replace the control circuit board 1, simply remove the screws, remove the damaged control circuit board from the control cover 5, and then secure the new control circuit board to the control cover 5 with screws, facilitating on-site maintenance.

[0036] Reference Figure 2 As shown, one end of the switch 9 is connected to the control circuit board 1, and the other end is connected to the power circuit board 2. A cable tie 8 is provided on the control cover 5, through which the cables 3 on the control circuit board 1 are connected to the switch 9. Specifically, multiple cables 3 are bound by the cable tie 8, passed through a window, and connected to the power circuit board 2. In other embodiments, the window can also be sealed with a cable gland to achieve a good seal. Using the cable tie 8 keeps the cables 3 more organized.

[0037] In the photovoltaic inverter of this embodiment, the control circuit board 1 is arranged on the outside of the box body 4. If the control circuit board 1 catches fire or is damaged, it is only necessary to remove the control cover 5 after turning off the power. At this time, the control circuit board 1 will be separated from the box body 4 along with the control cover 5, and only the cable 3 is connected to the control circuit board 1. The disassembly is relatively convenient, and it is also convenient to repair or perform on-site maintenance on the control circuit board 1. In addition, the control circuit board 1 is arranged outside the box body 4 to prevent the fire from spreading inside.

[0038] The working principle of the photovoltaic inverter of this embodiment is as follows:

[0039] The control circuit board 1 is fixed to the control cover 5 by screws. The cable 3 passes through the windows in the control cover 4 and the box body 4 and then connects to the switch 9 and the power circuit board 2. When maintenance is required, just turn off the power and remove the control cover 5. The control circuit board 1 will then be separated from the box body 4 along with the control cover 5, leaving only the cable 3 connected to the control circuit board 1. At this time, you only need to remove the screws fixing the broken control circuit board 1 to complete the removal of the control circuit board 1. Place the new, functioning control circuit board 1 on the control cover 5, tighten the screws, and lock the cable 3 to the new control circuit board 1. After sorting the cable 3, you can use the cable tie 8 to make it regular. Then, fix the entire control cover 5 to the box body 4, and the entire maintenance work is complete.

[0040] The photovoltaic inverter of this embodiment has at least the following advantages:

[0041] (1) The control cover 5 becomes an independent unit and is separated from the box body 4, so that the control circuit board 1 can be maintained without removing the panel 41 of the box body 4. The disassembly is relatively convenient, which is convenient for on-site maintenance;

[0042] (2) The control circuit board 1 has an independent cavity to prevent the fire from spreading internally;

[0043] (3) Isolation from the communication terminal to avoid affecting the signal, with good EMC shielding effect, no need to add a shielding cover.

[0044] As used in this specification and claims, the terms "comprises" and "include" merely indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list; a method or apparatus may also include other steps or elements. The term "and / or" as used herein includes any combination of one or more of the associated listed items.

[0045] It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. In addition, the terms "upper," "lower," "left," and "right" used in this utility model are only used with respect to the relative positions of the components of the utility model in the accompanying drawings.

[0046] The above embodiment is intended only to illustrate the technical concept and features of the present invention and is a preferred embodiment. Its purpose is to enable those familiar with the art to understand the content of the present invention and implement it accordingly. It is not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made based on the principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A photovoltaic inverter, comprising a box, a power circuit board and a control circuit board, wherein the power circuit board is arranged in the box, characterized in that: The photovoltaic inverter also includes a control cover. The box body is provided with a window communicating with the inner cavity of the box body. The control cover is connected to the box body and covers the outside of the window. The control circuit board is connected inside the control cover. The control circuit board is electrically connected to the power circuit board through a cable, and the cable passes through the window.

2. The photovoltaic inverter according to claim 1, characterized in that: The box body comprises a panel, a back panel and a side panel arranged between the panel and the back panel, the window is opened on the side panel of the box body; the open end of the control cover is correspondingly connected to the side panel of the box body.

3. The photovoltaic inverter according to claim 2, characterized in that: The control cover and the side panels of the box body are fixedly connected by a plurality of fasteners.

4. The photovoltaic inverter according to claim 2, characterized in that: A sealing strip is provided between the control cover and the box body.

5. The photovoltaic inverter according to claim 1, characterized in that: The control cover has a cavity, and the control circuit board is arranged in the cavity.

6. The photovoltaic inverter according to claim 5, characterized in that: There are multiple control circuit boards in the cavity.

7. The photovoltaic inverter according to claim 6, characterized in that: A plurality of positioning holes are provided in the control cover, and the control circuit board is fixed at the positioning holes by a plurality of fasteners.

8. The photovoltaic inverter according to claim 1, characterized in that: The photovoltaic inverter further includes a switch disposed in the box, one end of the switch being connected to the control circuit board, and the other end being connected to the power circuit board.

9. The photovoltaic inverter according to claim 8, characterized in that: The control cover is provided with a cable tie, and the cables on the control circuit board are connected to the switch through the cable tie.

10. A photovoltaic system comprising a photovoltaic module, characterized in that: The photovoltaic system further comprises the photovoltaic inverter according to any one of claims 1 to 9, and the photovoltaic assembly is electrically connected to a control circuit board of the photovoltaic inverter.

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