High-efficiency grid-connected inverter with good stability

Abstract

The utility model discloses a high-efficiency grid-connected inverter with good stability, which comprises an inverter body, a shell is arranged on the outer wall of the front surface of the inverter body, a connecting port assembly is arranged at the bottom of the inverter body, and a rotating protection mechanism is arranged on the back surface, close to the connecting port assembly, of the inverter body. A shell is arranged on the outer wall of the front face of the inverter body, cooling fins are fixedly connected to the outer wall of the back face of the inverter body, a prompt panel is arranged on the front face of the shell, and the connecting port assembly comprises a grid-connected wiring port, a PV port, a direct-current switch, a WIFI interface and a 485 communication interface. And the PV port, the DC switch, the WIFI interface, the 485 communication interface and the grid-connected wiring port are fixedly connected to the outer wall of the bottom of the inverter body from left to right. According to the utility model, the problem that the connection port assembly is easy to oxidize or loosen in the use process is effectively solved, and the effect of protecting the stable operation of the grid-connected inverter is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of grid-connected inverters, in particular to a high-efficiency grid-connected inverter with good stability. Background Art

[0002] As global environmental pollution and energy shortage become increasingly serious, finding new energy has become a problem that every country has to face. As we all know, solar energy is the most abundant and cleanest renewable energy in the world today, among which photovoltaic power generation is increasingly recognized and concerned by people. In recent years, photovoltaic power generation grid-connected technology has become the mainstream of photovoltaic power generation applications. In order to meet the needs of converting the direct current generated by solar energy into 220V / 230V alternating current through a grid-connected inverter, and the generated electricity is connected to the national grid.

[0003] After searching, the Chinese patent application number CN2019216581328 discloses a grid-connected inverter, which includes a box, a heat sink and multiple inductors; the box includes a first installation space and a second installation space that are isolated from each other, the first installation space is provided with power devices, and the second installation space is provided with DC input side devices and AC output side devices; the heat sink is fixed to the back panel of the box corresponding to the first installation space, and the multiple inductors are arranged below the heat sink. A grid-connected inverter in the above patent has the following shortcomings:

[0004] Although the overall device solves the problems of large size and high cost of existing grid-connected inverters, the interface terminals located under the box have no corresponding protective measures. During long-term use, the connections are prone to loosening and oxidation. Therefore, there is an urgent need for an efficient grid-connected inverter with good stability. Utility Model Content

[0005] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a high-efficiency grid-connected inverter with good stability.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A high-efficiency grid-connected inverter with good stability comprises an inverter body, a shell is arranged on the front outer wall of the inverter body, a connection port assembly is arranged on the bottom of the inverter body, a rotation protection mechanism is arranged on the back of the inverter body near the connection port assembly, a shell is arranged on the front outer wall of the inverter body, a heat sink is fixedly connected to the back outer wall of the inverter body, and a prompt panel is arranged on the front of the shell.

[0008] As a further solution of the utility model: the connection port assembly includes a grid-connected wiring port, a PV port, a DC switch, a WIFI interface and a 485 communication interface, and the PV port, the DC switch, the WIFI interface, the 485 communication interface and the grid-connected wiring port are fixedly connected to the bottom outer wall of the inverter body from left to right.

[0009] As a further solution of the utility model: the rotation protection mechanism includes a protective shell, a slide groove, a slider and a limit groove, and the slide groove is opened on the back side of the inverter body, the slider is slidably connected in the slide groove, and the outer walls on both sides of the slider are respectively provided with spring telescopic shafts, and the slider and the protective shell are integrally formed.

[0010] As a further solution of the utility model: the slider is located at the two corners of the top back side of the protective shell, the limiting grooves are opened on both sides of the slide groove, and the spring telescopic shaft is rotatably connected to the limiting groove, and a locking mechanism is arranged on one side of the top of the limiting groove.

[0011] As a further solution of the utility model: the locking mechanism includes a button, a clamping hole, a moving block, a pressing block and a spring, and the clamping hole is opened in the limiting groove, and the extended end of the spring telescopic shaft is adapted to the clamping hole.

[0012] As a further solution of the utility model: a guide hole is opened at the top of the clamping hole, the pressing block is slidably connected in the guide hole, the button is arranged on the top of the pressing block, and the moving block is slidably connected to the bottom inner wall of the clamping hole.

[0013] As a further solution of the utility model: both ends of the spring are welded between one side of the moving block and the inner wall of the clamping hole, and the contact surfaces of the pressing block and the moving block are both inclined surfaces.

[0014] Compared with the prior art, the utility model provides a high-efficiency grid-connected inverter with good stability, which has the following beneficial effects:

[0015] 1. This is a high-efficiency grid-connected inverter with good stability. When working, the protective shell is dragged downward from the back of the inverter body by sliding the slider in the slide groove, and the protective shell is rotated to a certain angle and attached to the bottom of the inverter body by rotating the spring telescopic shaft in the limit groove, so that the connection port component is limited and protected, which effectively solves the problem that the connection port component is prone to oxidation or loosening during use, and plays a role in protecting the stable operation of the grid-connected inverter.

[0016] 2. This is a high-efficiency grid-connected inverter with good stability. The pressing block is driven to move downward by squeezing the button, and the moving block is driven to move horizontally by the inclined surface setting. The moving block squeezes the extension rod of the spring telescopic shaft to shrink the extension rod. At this time, the protective shell can slide vertically, and when the button is released, the extension rod of the spring telescopic shaft is inserted into the card hole, so that the protective shell is tightly attached to the back of the inverter body. This makes it convenient to use the protective shell and to fix the protective shell, thereby realizing the storage function of the protective shell.

[0017] 3. This high-efficiency grid-connected inverter with good stability adopts multiple inverter technology, which can increase the inverter efficiency to more than 98%, effectively reducing energy loss; it is easy to install and maintain, with a compact structure, small size, easy installation and maintenance, and reduces the cost of use; and the use of clean energy technology can effectively reduce carbon emissions and environmental pollution, and has significant environmental protection and energy-saving effects.

[0018] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art. The utility model has a simple structure and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the main structure of a high-efficiency grid-connected inverter with good stability proposed by the utility model;

[0020] Figure 2 This is a side view structural diagram of a high-efficiency grid-connected inverter with good stability proposed by the utility model;

[0021] Figure 3 This is a schematic diagram of the bottom structure of a high-efficiency grid-connected inverter with good stability proposed by the utility model;

[0022] Figure 4 This is a schematic diagram of the first partial structure of a high-efficiency grid-connected inverter with good stability proposed by the utility model;

[0023] Figure 5 This is a second partial structural diagram of a high-efficiency grid-connected inverter with good stability proposed by the utility model;

[0024] Figure 6 This is a structural schematic diagram of a locking mechanism in a high-efficiency grid-connected inverter with good stability proposed by the utility model;

[0025] Figure 7 The utility model provides a schematic diagram of the working process of a high-efficiency grid-connected inverter with good stability.

[0026] In the figure: 1. Shell; 2. Inverter body; 3. Prompt panel; 4. Heat sink; 5. Protective shell; 501. Slide groove; 502. Slider; 503. Button; 504. Limiting groove; 505. Clamp hole; 506. Spring telescopic shaft; 507. Moving block; 508. Pressing block; 509. Spring; 6. Grid connection port; 7. PV port; 8. DC switch; 9. WIFI interface; 10. 485 communication interface. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0028] In the description of this patent, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this patent.

[0029] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0030] Embodiment 1:

[0031] A high-efficiency grid-connected inverter with good stability, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, it includes an inverter body 2, the front outer wall of the inverter body 2 is fixed with a shell 1 by bolts, and a connection port assembly is arranged at the bottom of the inverter body 2, a rotation protection mechanism is arranged on the back of the inverter body 2 near the connection port assembly, the front outer wall of the inverter body 2 is fixed with the shell 1 by bolts, and a heat sink 4 is fixedly connected to the back outer wall of the inverter body 2, and a prompt panel 3 is arranged on the front of the shell 1; the inverter in this case adopts HS3000;

[0032] The connection port assembly includes a grid-connected wiring port 6, a PV port 7, a DC switch 8, a WIFI interface 9 and a 485 communication interface 10, and the PV port 7, the DC switch 8, the WIFI interface 9, the 485 communication interface 10 and the grid-connected wiring port 6 are fixedly connected to the bottom outer wall of the inverter body 2 from left to right.

[0033] In order to solve the problem that the connection port components are prone to oxidation or loosening during use, such as Figure 1 As shown, the rotation protection mechanism includes a protective shell 5, a slide groove 501, a slider 502 and a limiting groove 504, and the slide groove 501 is opened on the back side of the inverter body 2, the slider 502 is slidably connected in the slide groove 501, and the outer walls on both sides of the slider 502 are respectively connected with spring telescopic shafts 506 through threads, the slider 502 and the protective shell 5 are integrally formed, and the slider 502 is located at the two corners of the top back of the protective shell 5, the limiting groove 504 is opened on both sides of the slide groove 501, and the spring telescopic shaft 506 is rotatably connected in the limiting groove 504, and a locking mechanism is provided on one side of the top of the limiting groove 504;

[0034] During operation, the protective shell 5 is dragged downward from the back of the inverter body 2 by the slider 502 sliding in the slide groove 501, and the protective shell 5 is rotated to a certain angle and attached to the bottom of the inverter body 2 by the spring telescopic shaft 506 rotating in the limiting groove 504, so that the connection port assembly can be limited and protected, effectively solving the problem of oxidation or loosening of the connection port assembly during use, and playing a role in protecting the stable operation of the grid-connected inverter.

[0035] In order to ensure that the protective shell 5 can be stably fixed to the back of the inverter body 2, as shown in FIG. Figure 5 and Figure 6 As shown, the locking mechanism includes a button 503, a clamping hole 505, a moving block 507, a pressing block 508 and a spring 509, and the clamping hole 505 is opened in the limiting groove 504, the extended end of the spring telescopic shaft 506 is adapted to the clamping hole 505, and a guide hole is opened at the top of the clamping hole 505, the pressing block 508 is slidably connected in the guide hole, the button 503 is connected to the top of the pressing block 508 by a thread, the moving block 507 is slidably connected to the bottom inner wall of the clamping hole 505, and both ends of the spring 509 are welded between one side of the moving block 507 and the inner wall of the clamping hole 505, and the contact surfaces of the pressing block 508 and the moving block 507 are both inclined surfaces;

[0036] The pressing block 508 is driven to move downward by squeezing the button 503, and the moving block 507 is driven to move horizontally by the inclined surface setting. The moving block 507 squeezes the extension rod of the spring telescopic shaft 506 to shrink the extension rod. At this time, the protective shell 5 can slide vertically, and when the button is released, the extension rod of the spring telescopic shaft 506 is inserted into the card hole 505, so that the protective shell 5 is tightly attached to the back of the inverter body 2. This makes it convenient to use the protective shell 5 and to fix the protective shell 5, thereby realizing the storage function of the protective shell 5.

[0037] Embodiment 2:

[0038] A high-efficiency grid-connected inverter with good stability comprises an MPPT maximum power point tracking, a BOOST direct current boost circuit, a three-level H6 bridge inverter circuit, and an inverter-side LC filter circuit; wherein the MPPT tracks the maximum power output point of a photovoltaic panel to enable the system to maintain maximum power output; the BOOST direct current boost circuit boosts the direct current output of the photovoltaic panel, and the three-level H6 bridge inverter circuit inverts the stored direct current into a stable, efficient, low-noise, and highly reliable alternating current and incorporates it into a power grid; the inverter-side LC filter can filter out one or more harmonics and enhance anti-interference capability.

[0039] (1) The Boost circuit boosts the DC power output by the photovoltaic panel and supplies it to the internal BUS;

[0040] (2) The inverter circuit adopts a three-level H6 bridge inverter circuit structure to invert the stored DC power into AC power and integrate it into the grid.

[0041] (3) The LC filter on the inverter side can mainly filter out one or more harmonics and enhance the anti-interference ability.

[0042] (4) The MPPT tracking algorithm is used to track the maximum power output point of the photovoltaic panel to keep the system at maximum power output.

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-efficiency grid-connected inverter with good stability, comprising an inverter body (2), characterized in that: The front outer wall of the inverter body (2) is provided with a shell (1), and the bottom of the inverter body (2) is provided with a connection port assembly, and the back of the inverter body (2) is provided with a rotation protection mechanism, the front outer wall of the inverter body (2) is provided with a shell (1), and the back outer wall of the inverter body (2) is fixedly connected with a heat sink (4), and the front of the shell (1) is provided with a prompt panel (3); The rotation protection mechanism comprises a protective shell (5), a slide groove (501), a slider (502) and a limiting groove (504), wherein the slide groove (501) is opened on one side of the back side of the inverter body (2), the slider (502) is slidably connected in the slide groove (501), and the outer walls on both sides of the slider (502) are respectively provided with spring telescopic shafts (506), the slider (502) and the protective shell (5) are integrally formed, the slider (502) is located at two corners of the top back side of the protective shell (5), the limiting groove (504) is opened on both sides of the slide groove (501), and the spring telescopic shaft (506) is rotatably connected in the limiting groove (504), and a locking mechanism is provided on one side of the top of the limiting groove (504); The locking mechanism comprises a button (503), a clamping hole (505), a moving block (507), a pressing block (508) and a spring (509), wherein the clamping hole (505) is opened in the limiting groove (504), the extended end of the spring telescopic shaft (506) is matched with the clamping hole (505), a guide hole is opened at the top of the clamping hole (505), the pressing block (508) is slidably connected in the guide hole, the button (503) is arranged at the top of the pressing block (508), the moving block (507) is slidably connected to the bottom inner wall of the clamping hole (505), two ends of the spring (509) are welded between one side of the moving block (507) and the inner wall of the clamping hole (505), and the contact surfaces of the pressing block (508) and the moving block (507) are both inclined surfaces.

2. A high-efficiency grid-connected inverter with good stability according to claim 1, characterized in that: The connection port assembly comprises a grid-connection port (6), a PV port (7), a DC switch (8), a WIFI interface (9) and a 485 communication interface (10), and the PV port (7), the DC switch (8), the WIFI interface (9), the 485 communication interface (10) and the grid-connection port (6) are fixedly connected to the outer wall of the bottom of the inverter body (2) from left to right.

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