CN214674910U

CN214674910U - Micro inverter for grid-connected system

Info

Publication number: CN214674910U
Application number: CN202120476359.1U
Authority: CN
Inventors: 虞希清
Original assignee: Zhejiang Delight Microelectronics Co ltd
Current assignee: Zhejiang Delight Microelectronics Co ltd
Priority date: 2021-03-05
Filing date: 2021-03-05
Publication date: 2021-11-09
Anticipated expiration: 2031-03-05

Abstract

The utility model discloses a micro inverter used in a grid-connected system, which comprises an inverter body, the inverter body comprises a rectangular shell, an inverter circuit board fixedly arranged in the shell and a plurality of electronic components fixed on the inverter circuit board, a plurality of radiating fins arranged along the length direction of the shell are arranged on three outer side walls which are sequentially adjacent on the shell, the end parts of the two opposite ends of the other side wall of the shell are respectively provided with a connecting plate, the connecting plate is provided with a connecting hole, an air inlet hole is arranged at one end part of the shell, an air outlet hole is arranged at the other end part of the shell, a mounting frame is fixedly arranged on the shell at a position corresponding to the outer side of the air outlet hole, a heat dissipation fan is fixedly arranged on the inner side of the mounting frame, the inverter circuit board is fixed on the mounting positioning plate. The utility model has the advantages of reasonable design, the radiating effect is good, is favorable to the popularization and application of marketization.

Description

Micro inverter for grid-connected system

Technical Field

The utility model relates to an inverter technical field, concretely relates to a micro-inverter for in grid-connected system.

Background

With the rapid development of global economy, the consumption of fossil energy is rapidly increased, and the environmental problems are increasingly highlighted due to the excessive exploitation and utilization of the energy. Therefore, development and utilization of renewable energy have been the focus of common attention in countries around the world. Among them, solar energy has become a hot spot in the field of new energy research due to its characteristics of sustainability, no pollution, safety and reliability. The grid-connected photovoltaic power generation system is the mainstream application mode of the world solar photovoltaic power generation system. The photovoltaic power generation realizes alternating current output through the inverter so as to be connected with the commercial power grid in a grid mode, so that the on-site power consumption can be realized, and the investment and operation cost of power transmission and transformation is saved; and the power generation of the utility grid is assisted, so that the capacity of the power grid can be effectively adjusted, and the peak clipping and valley filling can be realized.

At present, two grid-connected modes of a photovoltaic system are mainly adopted, wherein one mode is that a large grid-connected inverter is adopted to realize grid connection, and the other mode is that a micro grid-connected inverter is adopted to realize grid connection. In a photovoltaic system adopting a large grid-connected inverter, each battery panel group string needs to be monitored in real time in order to avoid grid connection of a fault system. The parameter monitoring of the system is mainly realized by communication modes such as a wireless network or an Ethernet, and the like, and the high-cost complicated work of establishing a transmitting base station, rewiring and the like exists. Meanwhile, the monitored data is the total voltage and current of the converged battery panel group string, the information of the shielded or failed battery panel is difficult to accurately reflect, and the control terminal is inconvenient to position the shielded or failed battery panel so as to timely take emergency measures and off-grid strategies. In a photovoltaic system adopting a micro grid-connected inverter, inversion grid-connected output is realized by a single battery panel, the efficiency and grid connection of all the battery panels cannot be influenced by shielding and faults, and the influence on the stability of a power grid is small due to small grid-connected power, so that the photovoltaic system is more widely applied.

The micro inverter applied to a grid-connected system is required to have a strong heat dissipation function, but the conventional micro inverter in the prior art has a poor heat dissipation effect when in use, so that internal components and external cables of the inverter are easily ignited and burnt, and potential safety hazards are caused.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve above-mentioned problem, provide a structural design is reasonable, the micro inverter who is arranged in the grid-connected system that the radiating effect is good.

The utility model adopts the following technical scheme:

the utility model provides a micro inverter for in grid-connected system, includes the dc-to-ac converter body, the dc-to-ac converter body includes the casing of rectangle, fixes and sets up in the inside contravariant circuit board of casing and be fixed in a plurality of electronic components on the contravariant circuit board, all be equipped with the heat dissipation wing that a plurality of length direction along the casing set up on the three lateral wall adjacent in proper order on the casing, the relative both ends tip of another lateral wall of casing is equipped with the connecting plate respectively, be equipped with the connecting hole on the connecting plate, the one end tip of casing is equipped with the inlet port, the other end tip of casing is equipped with the venthole, the position department corresponding to the venthole outside on the casing is fixed and is equipped with the mounting bracket, the inboard fixed mounting bracket of mounting bracket has the heat dissipation fan, the inside installation locating plate that is equipped with of casing, the contravariant circuit board is fixed in on the installation locating plate.

As a preferred technical scheme of the utility model, just be equipped with the filter screen corresponding to the fixed position department of inlet port on the inside wall of casing, the mounting bracket adopts screen cloth shape ventilating board to make.

As an optimal technical scheme of the utility model, the one end fixing that is close to the inlet port on the casing is equipped with the binding post that a plurality of and inverter circuit board are connected.

As an optimized technical scheme of the utility model, through screwed connection between mounting bracket and the casing.

The utility model has the advantages that:

the utility model has the advantages of reasonable design, the heat dissipation fan cooperation venthole and the inlet port that wherein set up can effectually dispel the heat to casing inside, the inside radiating effect of improvement casing that the heat dissipation wing that sets up simultaneously can be further to guarantee that the dc-to-ac converter body has good heat dispersion.

Drawings

Fig. 1 is a schematic structural diagram of a micro inverter used in a grid-connected system according to the present invention;

fig. 2 is a schematic cross-sectional view of a micro inverter for use in a grid-connected system according to the present invention;

the symbols in the drawings illustrate that:

the heat dissipation structure comprises a shell 1, an inverter circuit board 2, an electronic component 3, heat dissipation fins 4, a connecting plate 5, air inlet holes 6, air outlet holes 7, a mounting frame 8, a heat dissipation fan 9, a mounting positioning plate 10, a filter screen 11 and a wiring terminal 12.

Detailed Description

The invention will now be described in further detail with reference to the accompanying drawings.

As shown in fig. 1 and 2, a micro-inverter for use in a grid-connected system includes an inverter body, the inverter body comprises a rectangular shell 1, an inverter circuit board 2 fixedly arranged in the shell 1 and a plurality of electronic components 3 fixed on the inverter circuit board 2, a plurality of radiating fins 4 arranged along the length direction of the shell 1 are arranged on three outer side walls which are sequentially adjacent on the shell 1, the opposite ends of the other side wall of the shell 1 are respectively provided with a connecting plate 5, the connecting plate 5 is provided with a connecting hole (not shown in the figure), an air inlet hole 6 is arranged at one end part of the shell 1, an air outlet hole 7 is arranged at the other end part of the shell 1, a mounting rack 8 is fixedly arranged on the shell 1 at a position corresponding to the outer side of the air outlet 7, and the mounting rack 8 is connected with the shell 1 through screws; a heat dissipation fan 9 is fixedly installed on the inner side of the mounting frame 8, an installation positioning plate 10 is arranged inside the shell 1, and the inverter circuit board 2 is fixed on the installation positioning plate 10; further, in the present embodiment, the inverter circuit board 2 and the electronic component 3 are both the inverter circuit board and the electronic component conventionally used in the prior art, which are well known to those skilled in the art;

furthermore, a filter screen 11 is fixedly arranged on the inner side wall of the shell 1 and at a position corresponding to the air inlet 6, and the mounting frame 8 is made of a screen-shaped ventilating plate. A plurality of connecting terminals 12 connected with the inverter circuit board 2 are fixedly arranged at one end part of the shell 1 close to the air inlet 6, and the connecting terminals 12 are also conventionally used connecting terminals in the prior art and are well known to those skilled in the art.

Finally, it should be noted that: these embodiments are merely illustrative of the present invention and do not limit the scope of the invention. In addition, other variations and modifications will be apparent to persons skilled in the art based on the foregoing description. And are neither required nor exhaustive of all embodiments. And obvious changes and modifications may be made without departing from the scope of the present invention.

Claims

1. The utility model provides a micro inverter for being incorporated into power networks among system, includes the inverter body, the inverter body includes casing (1) of rectangle, fixed setting in inside inverter circuit board (2) of casing (1) and be fixed in a plurality of electronic components (3) on inverter circuit board (2), its characterized in that: all be equipped with heat dissipation wing (4) that a plurality of length direction along casing (1) set up on casing (1) in proper order adjacent three lateral wall, the relative both ends tip of another lateral wall of casing (1) is equipped with connecting plate (5) respectively, be equipped with the connecting hole on connecting plate (5), the one end tip of casing (1) is equipped with inlet port (6), the other end tip of casing (1) is equipped with venthole (7), the position department corresponding to the venthole (7) outside on casing (1) is fixed and is equipped with mounting bracket (8), the inboard fixed mounting of mounting bracket (8) has heat dissipation fan (9), casing (1) inside is equipped with installation locating plate (10), contravariant circuit board (2) are fixed in on installation locating plate (10).

2. The micro-inverter for grid-connected system according to claim 1, wherein: the air inlet structure is characterized in that a filter screen (11) is fixedly arranged on the inner side wall of the shell (1) and corresponds to the position of the air inlet hole (6), and the mounting frame (8) is made of a screen-shaped ventilating plate.

3. The micro-inverter for grid-connected system according to claim 1, wherein: and a plurality of wiring terminals (12) connected with the inverter circuit board (2) are fixedly arranged at the end part of one end of the shell (1) close to the air inlet (6).

4. The micro-inverter for grid-connected system according to claim 1, wherein: the mounting rack (8) is connected with the shell (1) through screws.