A photovoltaic grid-connected inverter

Abstract

The utility model relates to inverter technical field, and disclose a kind of photovoltaic grid-connected inverter, including shell, the inside of shell is provided with heat dissipation module, and the inner wall of shell is fixedly connected with guide rail, the top of guide rail is embedded with spring one and spring two, the top of spring one and spring two is contacted with hook plate, the top of shell is inserted with unlocking pin, the inner wall of shell is fixedly connected with baffle, and the lower surface of baffle is equipped with electrified socket.The utility model is through being provided with heat dissipation module, and heat dissipation fan can be to internal electrical equipment heat dissipation, heat dissipation hole promotes air circulation, dust screen filters dust;And set two groups of heat dissipation module, when a group of fault, can be individually disassembled overhauls, another group still can maintain heat dissipation, without stopping inverter;Heat dissipation module is easily disassembled, and unlocking pin can be made hook plate to separate from card slot, and module is extracted by lifting handle, spring one can keep hook plate position, and it is convenient to reinstall.

Description

Technical Field

[0001] This utility model relates to the field of inverter technology, specifically a photovoltaic grid-connected inverter. Background Technology

[0002] In solar photovoltaic (PV) power generation systems, the electricity generated by photovoltaic panels through the photoelectric effect is direct current (DC), while the electricity required by the power grid and various conventional electrical devices is alternating current (AC). Therefore, the PV grid-connected inverter, as the core equipment for power conversion, undertakes the crucial task of converting the DC output from the photovoltaic cells into AC power that meets grid connection standards. Furthermore, the inverter also needs to perform maximum power point tracking (MPPT) control, grid synchronization, and power quality regulation to ensure the stable operation of the PV power generation system and efficient power transmission, achieving a reliable conversion of solar energy into usable electrical energy.

[0003] According to a search, Chinese patent document CN216520676U discloses a photovoltaic grid-connected inverter. Through the cooperation of slide rails, sliders, levers, and torsion springs, the inverter allows for quick adjustment of the main unit's height after installation, thus reducing the requirements for the installation location and facilitating installation by operators. It also offers two installation methods, providing convenience for staff. However, this inverter, and most inverters on the market, lack a modular design for heat dissipation. When the heat dissipation structure malfunctions, such as the cooling fan stopping, the heat dissipation components are difficult to quickly disassemble and replace because they are installed inside the inverter casing. Maintenance personnel must shut down the entire inverter for maintenance. This not only causes the photovoltaic power generation system to malfunction during maintenance, resulting in reduced power generation efficiency and energy loss, but also increases operation and maintenance costs and repair time. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a photovoltaic grid-connected inverter with a modular heat dissipation structure. This structure effectively dissipates heat from the inverter and allows for independent maintenance even in the event of a fault, without affecting the normal operation of the inverter. This solves the aforementioned technical problems.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a photovoltaic grid-connected inverter, including a housing, a heat dissipation module is provided inside the housing, and a guide rail is fixedly connected to the inner wall of the housing. A spring 1 and a spring 2 are embedded at the top of the guide rail, and the tops of the spring 1 and the spring 2 abut against a hook plate. An unlocking pin is inserted into the top of the housing, and a partition is fixedly connected to the inner wall of the housing. A power socket is installed on the lower surface of the partition.

[0008] The heat dissipation module includes a rectangular frame, a cover plate fixedly connected to the top surface of the rectangular frame, a handle fixedly connected to the top surface of the cover plate, a cooling fan connected to the inner wall of the rectangular frame by screws, and a dustproof net fixedly connected to the other inner wall of the rectangular frame. A guide groove is provided on the back of the rectangular frame, a conductive terminal is installed at the bottom of the rectangular frame, and a slot is provided on the side wall of the rectangular frame.

[0009] Preferably, the front of the housing is connected to a panel by screws, and the bottom of the housing is connected to a DC input terminal and an AC output terminal.

[0010] Preferably, the housing is provided with a power conversion circuit, which is a single-stage high-frequency isolated topology and integrates a high-frequency magnetic coupling unit, a switching module and a filtering module.

[0011] Preferably, heat dissipation holes are provided on both sides of the housing, and slots are provided on the upper surface of the partition for conductive terminals to pass through, wherein the conductive terminals are plugged into the power-conducting sockets.

[0012] Preferably, the heat dissipation module is provided in two sets, the top surface of the housing is provided with a rectangular hole, and the outer surface of the guide rail slides in contact with the guide groove.

[0013] Preferably, the top of the hook plate is hooked into a slot, the bottom of the unlocking pin abuts against the hook plate, and a pin is rotatably connected inside the hook plate, with one end of the pin fixedly connected to the inner wall of the housing.

[0014] Compared with the prior art, this utility model provides a photovoltaic grid-connected inverter with the following advantages:

[0015] This utility model features a heat dissipation module. The cooling fan dissipates heat from the internal electrical components, the heat dissipation holes promote air circulation, and the dust filter filters dust. It also has two sets of heat dissipation modules. When one set fails, it can be removed and repaired separately, while the other set can continue to dissipate heat without stopping the inverter. The heat dissipation module is easy to disassemble. Pressing the unlocking pin allows the hook plate to disengage from the slot, and the module can be pulled out by the handle. A spring can hold the hook plate in place, making it easy to reinstall.

[0016] Figure 1 This is a three-dimensional structural schematic diagram of the present utility model;

[0017] Figure 2 This is a side sectional view of the structure of this utility model;

[0018] Figure 3 This is a three-dimensional schematic diagram of the heat dissipation module in the structure of this utility model;

[0019] Figure 4 This is a front view of the heat dissipation module in the structure of this utility model;

[0020] Figure 5 The structure of this utility model Figure 2 A magnified view of part A in the diagram.

[0021] The components are as follows: 1. Housing; 2. Heat dissipation module; 21. Rectangular frame; 22. Cover plate; 23. Handle; 24. Cooling fan; 25. Dustproof net; 26. Guide groove; 27. Conductive terminal; 28. Slot; 3. Guide rail; 4. Spring 1; 5. Spring 2; 6. Hook plate; 7. Unlocking pin; 8. Partition plate; 9. Power socket; 10. Panel; 11. DC input terminal; 12. AC output terminal; 13. Heat dissipation hole. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1-5 A photovoltaic grid-connected inverter includes a housing 1, a heat dissipation module 2 is provided inside the housing 1, and a guide rail 3 is fixedly connected to the inner wall of the housing 1. A spring 4 and a spring 5 are embedded at the top of the guide rail 3. The tops of the spring 4 and the spring 5 abut against a hook plate 6. An unlocking pin 7 is inserted into the top of the housing 1. A partition 8 is fixedly connected to the inner wall of the housing 1, and a power socket 9 is installed on the lower surface of the partition 8.

[0024] The heat dissipation module 2 includes a rectangular frame 21, a cover plate 22 fixedly connected to the top surface of the rectangular frame 21, a handle 23 fixedly connected to the top surface of the cover plate 22, a cooling fan 24 connected to the inner wall of the rectangular frame 21 by screws, and a dustproof mesh 25 fixedly connected to the other inner wall of the rectangular frame 21. A guide groove 26 is provided on the back of the rectangular frame 21, a conductive terminal 27 is installed at the bottom of the rectangular frame 21, and a slot 28 is provided on the side wall of the rectangular frame 21.

[0025] Specifically, the front of the housing 1 is connected to the panel 10 by screws, and the bottom of the housing 1 is connected to the DC input terminal 11 and the AC output terminal 12.

[0026] Specifically, the housing 1 is equipped with a power conversion circuit, which is a single-stage high-frequency isolated topology and integrates a high-frequency magnetic coupling unit, a switching module and a filtering module.

[0027] The advantages are that the single-stage high-frequency isolated topology power conversion circuit inside the housing 1 integrates a high-frequency magnetic coupling unit, a switching module, and a filtering module, achieving efficient DC-to-AC conversion and electrical isolation. The high-frequency magnetic coupling unit uses a high-frequency transformer instead of a traditional power frequency transformer, achieving both voltage boosting and power isolation while significantly reducing size and losses. The switching module (such as an H6 bridge circuit) precisely controls current flow, ensuring the output waveform is synchronized with the grid. The filtering module suppresses harmonic interference and improves power quality. This simplifies the traditional multi-stage conversion architecture, improving conversion efficiency (especially under low load conditions) while reducing the number of components and manufacturing costs. Furthermore, the panel 10 on the front of the housing 1 facilitates user operation and status monitoring, the DC input terminal 11 at the bottom connects to the DC power input of the photovoltaic modules, and the AC output terminal 12 connects the converted AC power to the grid. These three components together ensure reliable connection between the inverter, the photovoltaic system, and the grid, as well as convenient user interaction.

[0028] Specifically, heat dissipation holes 13 are provided on both sides of the housing 1, and slots for conductive terminals 27 to pass through are provided on the upper surface of the partition 8. The conductive terminals 27 are connected to the power socket 9.

[0029] Specifically, the heat dissipation module 2 is provided in two sets, and a rectangular hole is opened on the top surface of the housing 1. The outer surface of the guide rail 3 slides in contact with the guide groove 26.

[0030] The advantages are that the cooling fan 24 in the heat dissipation module 2 can dissipate heat from the various electrical components inside the housing 1, the heat dissipation holes 13 are used for air circulation inside and outside the housing 1, and the dust filter 25 can filter dust from the outside air to prevent dust from entering the interior of the housing 1. The wires of the cooling fan 24 are connected to the conductive terminal 27, which in turn is connected to the power socket 9. The power socket 9 is connected to the power supply device inside the housing 1, thus providing power to the cooling fan 24. At the same time, when the heat dissipation module 2 is removed from the inside of the housing 1, the conductive terminal 27 can be separated from the power socket 9. By setting two sets of heat dissipation modules 2, if one set of heat dissipation modules 2 fails, it can be removed and repaired separately. During this time, the inverter still has another set of heat dissipation modules 2 to provide heat dissipation, which makes it possible to repair the inverter without stopping it.

[0031] Specifically, the top of the hook plate 6 is hooked into the slot 28, the bottom of the unlocking pin 7 abuts against the hook plate 6, and the hook plate 6 is rotatably connected to a pin, one end of which is fixedly connected to the inner wall of the housing 1.

[0032] The advantages are that when the unlocking pin 7 is pressed so that its bottom end abuts against the side end of the hook plate 6, the hook plate 6 is forced to rotate around the pin. At this time, the top end of the hook plate 6 is removed from the slot 28, and the heat dissipation module 2 can be pulled out from the inside of the housing 1 by pulling the handle 23. The overall structure makes it convenient and quick to remove the heat dissipation module 2 from the inside of the housing 1. The spring 4 abuts against the hook plate 6 so that after the heat dissipation module 2 is removed, the hook plate 6 will not flip counterclockwise due to the action of the spring 5, thus maintaining the position of the hook plate 6. This makes it convenient for the top end of the hook plate 6 to be re-engaged into the slot 28 after the rectangular frame 21 is reinserted into the housing 1. During the process of inserting the rectangular frame 21 into the housing 1, it is necessary to align the guide groove 26 with the guide rail 3 so that the rectangular frame 21 slides along the direction of the guide rail 3. This ensures that the conductive terminal 27 is accurately connected to the power socket 9.

[0033] In use, first, connect the DC power supply of the photovoltaic module to the DC input terminal 11 at the bottom of the housing 1; second, ensure that the guide groove 26 of the heat dissipation module 2 is aligned with the guide rail 3, insert the rectangular frame 21 into the housing 1 along the direction of the guide rail 3, so that the conductive terminal 27 is accurately connected to the power socket 9, and at the same time, the top of the hook plate 6 hooks into the slot 28 to realize the installation and fixation of the heat dissipation module 2; then, connect the converted AC power to the power grid through the AC output terminal 12; during use, the cooling fan 24 in the heat dissipates heat from the electrical components inside the housing 1, and the dust filter 25 filters dust; if the heat dissipation module 2 malfunctions, press the unlocking pin 7 so that its bottom end touches the side end of the hook plate 6, forcing the hook plate 6 to rotate around the pin, and the top end is removed from the slot 28. Pull out the faulty heat dissipation module 2 for repair by pulling the handle 23. Another set of heat dissipation modules 2 can continue to provide heat dissipation without affecting the operation of the inverter. After the repair is completed, reinstall the heat dissipation module 2 according to the installation steps.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A photovoltaic grid-connected inverter, comprising a housing (1), characterized in that: The housing (1) is provided with a heat dissipation module (2) inside, and a guide rail (3) is fixedly connected to the inner wall of the housing (1). A spring (4) and a spring (5) are embedded at the top of the guide rail (3). The tops of the springs (4) and (5) abut against the hook plate (6). An unlocking pin (7) is inserted into the top of the housing (1). A partition (8) is fixedly connected to the inner wall of the housing (1). A power socket (9) is installed on the lower surface of the partition (8). The heat dissipation module (2) includes a rectangular frame (21), a cover plate (22) is fixedly connected to the top surface of the rectangular frame (21), a handle (23) is fixedly connected to the top surface of the cover plate (22), a cooling fan (24) is connected to the inner wall of the rectangular frame (21) by screws, and a dustproof net (25) is fixedly connected to the other inner wall of the rectangular frame (21). A guide groove (26) is provided on the back of the rectangular frame (21), a conductive terminal (27) is installed at the bottom of the rectangular frame (21), and a slot (28) is provided on the side wall of the rectangular frame (21).

2. A photovoltaic grid-connected inverter according to claim 1, characterized in that: The front of the housing (1) is connected to a panel (10) by screws, and the bottom of the housing (1) is connected to a DC input terminal (11) and an AC output terminal (12).

3. A photovoltaic grid-connected inverter according to claim 1, characterized in that: The housing (1) is equipped with a power conversion circuit, which is a single-stage high-frequency isolated topology and integrates a high-frequency magnetic coupling unit, a switching module and a filtering module.

4. A photovoltaic grid-connected inverter according to claim 1, characterized in that: The housing (1) has heat dissipation holes (13) on both sides, and the upper surface of the partition (8) has slots through which conductive terminals (27) can pass. The conductive terminals (27) are connected to the power socket (9).

5. A photovoltaic grid-connected inverter according to claim 1, characterized in that: The heat dissipation module (2) is provided in two sets, and the top surface of the housing (1) is provided with a rectangular hole, and the outer surface of the guide rail (3) slides in contact with the guide groove (26).

6. A photovoltaic grid-connected inverter according to claim 1, characterized in that: The top of the hook plate (6) is hooked to the slot (28), the bottom of the unlocking pin (7) abuts against the hook plate (6), and the hook plate (6) is rotatably connected to a pin shaft inside, one end of which is fixedly connected to the inner wall of the housing (1).

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