Off-grid inverter

Abstract

The utility model relates to an off-grid inverter, which belongs to the technical field of inversion devices and comprises a casing and a main board arranged on the bottom wall of the casing, the main board is sequentially provided with a PV module, an inversion module, a DC-DC module and a battery module along the transverse direction, the front side of the PV module is provided with an AC module, the main board is provided with a copper bar jumper wire and a copper sheet, and the DC-DC module is connected with the battery module. The mainboard is connected with the PV module and the AC module through copper bar jumper wires, and the mainboard is connected with the battery module through a copper sheet. Wherein the PV module is a photovoltaic input module, the DC-DC module is a DC transformation module, and the AC module is an AC output module. According to the utility model, the PV module, the inversion module, the DC-DC module and the battery module are sequentially arranged along the transverse direction of the mainboard, the mainboard is connected with the PV module and the AC module through the copper bar jumper wire and is connected with the battery module through the copper sheet, and the inverter adopts a wireless design, has the advantages of compact structure, simplicity, order and convenience in wiring, and can improve the production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of inverter technology, specifically relating to a high-density integrated off-grid inverter. Background Technology

[0002] Off-grid inverters are core equipment in photovoltaic power generation systems, primarily used to convert direct current (DC) generated by solar panels into alternating current (AC) to meet the electricity demands of off-grid scenarios. The structural design of traditional off-grid inverters needs optimization. On one hand, existing off-grid inverters often employ a modular design for their functional modules, with numerous wires connecting the modules. This crisscrossing of wires not only leads to cramped internal space but also increases assembly complexity and labor costs. On the other hand, the module layout of existing off-grid inverters is relatively dispersed, resulting in a generally low power-to-volume ratio. Large-volume off-grid inverters not only occupy space but also increase transportation and installation costs, making them unsuitable for lightweight applications. Utility Model Content

[0003] The purpose of this invention is to provide an off-grid inverter in order to solve the above-mentioned problems.

[0004] This utility model achieves the above objectives through the following technical solutions:

[0005] An off-grid inverter includes a housing and a mainboard mounted on the bottom wall of the housing. A PV module, an inverter module, a DC-DC module, and a battery module are arranged horizontally on the mainboard. An AC module is located in front of the PV module. The input and output terminals of the DC-DC module are connected to the PV module and the inverter module, respectively. The output terminal of the inverter module is connected to the AC module. The mainboard has copper busbar jumpers and copper foil. The mainboard is connected to the PV module and the AC module via the copper busbar jumpers, and also connected to the battery module via the copper foil. The PV module is a photovoltaic input module, the DC-DC module is a DC-DC transformer module, and the AC module is an AC output module.

[0006] As a further optimization of this utility model, an SPS board is provided above the AC module, and a header is provided between the SPS board and the main board. The main board is connected to the SPS board through the header. The SPS board is a switching power supply board.

[0007] As a further optimization of this utility model, the motherboard is connected to a communication device and a control board at its front and rear ends, respectively.

[0008] As a further optimization of this utility model, the bottom of the control board is provided with a connector terminal, the control board is connected to the motherboard through the connector terminal, and the motherboard is fixed to the control board through fasteners.

[0009] As a further optimization of this utility model, the PV module includes a PV inductor and a heat sink 1 disposed between the PV inductor and the control board; the inverter module includes an inverter inductor and a heat sink 2; and the DC-DC module includes a step-up transformer and a heat sink 3, wherein the heat sink 2 and the heat sink 3 are disposed between the inverter inductor and the step-up transformer.

[0010] As a further optimization of this utility model, the housing includes a base and a junction box cover located on the front side of the base, and an upper cover located on the rear side of the base, with a partition plate provided between the upper cover and the junction box cover.

[0011] As a further optimization of this utility model, a fan is provided on the side of the partition plate near the battery module.

[0012] The beneficial effects of this utility model are as follows:

[0013] 1) In this utility model, the PV module, inverter module, DC-DC module and battery module are arranged horizontally along the main board. The main board is connected to the PV module and AC module through copper bus jumpers and connected to the battery module through copper foil. The SPS board is connected to the main board below through pin headers. The off-grid inverter has a compact structure and adopts a wireless design, making the inverter internal structure simple and orderly. The DC part and AC part, low voltage part and high voltage part are arranged separately, which facilitates wiring and can improve production efficiency.

[0014] 2) The AC module of this utility model is located in front of the PV module. The SPS board above the AC module is connected to the main board through pin headers. The control board and communication devices are distributed at the front and rear ends of the main board, away from the high voltage area, and the communication devices are isolated by the partition. The magnetic devices of the PPV module, inverter module and DC-DC module are reasonably distributed, which greatly improves the power-to-volume ratio of the inverter. The PCBA has a high integration density and has the advantages of small size, light weight and low cost. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the copper busbar jumper structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the copper sheet structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the control board structure of this utility model;

[0019] Figure 5 This is a schematic diagram of the SPS board structure of this utility model;

[0020] Figure 6A schematic diagram of the disassembled casing structure of this utility model.

[0021] In the diagram: 1. Chassis; 2. Motherboard; 3. PV module; 4. Inverter module; 5. DC-DC module; 6. Battery module; 7. AC module; 8. Copper busbar jumper; 9. Copper foil; 10. SPS board; 11. Pin header; 12. Communication device; 13. Control board; 14. Connector terminal; 15. Fastener; 16. Fan; 101. Base; 102. Junction box cover; 103. Top cover; 104. Middle partition; 301. PV inductor; 302. Heatsink 1; 401. Inverter inductor; 402. Heatsink 2; 501. Step-up transformer; 502. Heatsink 3; 601. Heatsink 4; 701. EMC inductor. Detailed Implementation

[0022] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0023] Example

[0024] like Figure 1-6 As shown, this embodiment relates to an off-grid inverter, which includes a housing 1 and a main board 2 mounted on the bottom wall of the housing 1. The housing 1 is assembled from four sheet metal parts: a base 101, a junction box cover 102, a top cover 103, and a partition plate 104. The junction box cover 102 is mounted on the front side of the base 101, the top cover 103 is mounted on the rear side of the base 101, and the partition plate 104 is mounted between the two inner side walls of the base 101 in the horizontal direction, and the partition plate 104 is located between the top cover 103 and the junction box cover 102. The partition plate 104 is also fixedly mounted on the top of the main board 2. The side where the junction box cover 102 is located is the front side, and the horizontal direction of the main board 2 is perpendicular to the front-back direction of the housing 1. A PV module 3, an inverter module 4, a DC-DC module 5, and a battery module 6 are fixedly mounted sequentially along the horizontal direction of the main board 2. The battery module 6 is used for charging and discharging external batteries and provides power support to AC loads. Among them, PV module 3 is a photovoltaic input module, and DC-DC module 5 is a DC transformer module. PV module 3 has an AC module 7 on its front side, which is an AC output module.

[0025] The input and output terminals of DC-DC module 5 are connected to PV module 3 and inverter module 4, respectively. The output terminal of inverter module 4 is connected to AC module 7. Main board 2 has a copper busbar jumper 8 on one side and a copper foil 9 on the other side. Main board 2 is connected to PV module 3 and AC module 7 via the copper busbar jumper 8, and to battery module 6 via the copper foil 9. The output terminal of PV module 3 is electrically connected to the input terminal of DC-DC module 5 via the copper busbar jumper 8 and main board 2. The output terminal of inverter module 4 is connected to the input terminal of AC module 7 via main board 2 and copper busbar jumper 8. An SPS board 10 is located above AC module 7. A pin header 11 is located between SPS board 10 and main board 2. Main board 2 is connected to SPS board 10 via pin header 11. SPS board 10 is a switching power supply board used to power the various communication devices 12.

[0026] During operation, photovoltaic DC power enters the housing 1 from the input terminal of PV module 3. Then, the photovoltaic DC power enters the DC-DC module 5 from the output terminal of PV module 3 for boosting. The boosted photovoltaic DC power is then converted into AC power by inverter module 4, and the AC power is processed by AC module 7 before being output. Because PV module 3, inverter module 4, DC-DC module 5, and battery module 6 are arranged horizontally along the main board 2, the overall structure of the off-grid inverter is relatively compact. The off-grid inverter features a compact structure and a wireless design. The main board 2 connects PV module 3 and AC module 7 via copper jumper wires 8, and connects to battery module 6 via copper foil 9. The SPS board 10 is fixed above the main board 2 by positioning posts, and the main board 2 is electrically connected to the SPS board 10 via pin headers 11. This design keeps the inverter internally simple and orderly, with DC and AC sections, and low-voltage and high-voltage sections arranged separately, facilitating wiring, reducing the number of parts, simplifying assembly, and improving production efficiency.

[0027] The mainboard 2 has communication devices 12 and a control board 13 connected to its front and rear ends, respectively. Two sets of communication devices 12 are provided. One set is fixedly installed at the front end of the mainboard 2, located on the side of the partition 104 away from the battery module 6. The other set is fixedly installed at the front end of the base 101 and electrically connected to the front end of the mainboard 2. The control board 13 has connector terminals 14 at its bottom, connecting to the mainboard 2 via these terminals. The mainboard 2 is fixed to the control board 13 via fasteners 15, preferably screws. The PV module 3 includes a PV inductor 301 and a heat sink 302 located between the PV inductor 301 and the control board 13. The inverter module 4 includes an inverter inductor 401 and a second heat sink 402. The DC-DC module 5 includes a step-up transformer 501 and a third heat sink 502, located between the inverter inductor 401 and the step-up transformer 501. Battery module 6 includes a battery connected to copper foil 9, and a heat sink 601 located behind copper foil 9. Heat sink 601 is located on the side of step-up transformer 501 away from heat sink 502. Heat sinks 302, 402, 502, and 601 all have heat dissipation fins. AC module 7 includes an EMC inductor 701 located in front of PV inductor 301. EMC is an abbreviation for electromagnetic compatibility. AC module 7 uses EMC inductor 701 to filter the output current. This photovoltaic inverter PCBA has a high integration density. PCBA is an abbreviation for printed circuit board assembly. In this embodiment, the main board 2, SPS board 10, and control board 13 are all printed circuit boards. This embodiment has the advantages of small size, light weight, and low cost. The power-to-volume ratio of the off-grid inverter is 0.56kW / L, meaning the power can reach 11kW, while the volume of the off-grid inverter is only 19.8L, which is significantly better than the power-to-volume ratio in the market.

[0028] In addition, such as Figure 5 As shown, the partition plate 104 is equipped with two fans 16 on the side near the battery module 6. The fans 16 dissipate heat from the PV module 3, inverter module 4, DC-DC module 5 and battery module 6 through heat sink 302, heat sink 402, heat sink 502 and heat sink 601, and also provide ventilation and heat exchange through the fans 16 to improve the working performance of the off-grid inverter.

[0029] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. An off-grid inverter comprising a casing (1) and a main board (2) arranged on the bottom wall of the casing (1), characterized in that: The motherboard (2) is arranged horizontally with a PV module (3), an inverter module (4), a DC-DC module (5) and a battery module (6). The PV module (3) has an AC module (7) on its front side. The input and output terminals of the DC-DC module (5) are connected to the PV module (3) and the inverter module (4) respectively. The output terminal of the inverter module (4) is connected to the AC module (7). The motherboard (2) is provided with copper busbar jumpers (8) and copper foil (9). The motherboard (2) is connected to the PV module (3) and the AC module (7) through the copper busbar jumpers (8), and the motherboard (2) is connected to the battery module (6) through the copper foil (9).

2. Off-grid inverter according to claim 1, characterized in that: An SPS board (10) is provided above the AC module (7). A header (11) is provided between the SPS board (10) and the main board (2). The main board (2) is connected to the SPS board (10) through the header (11).

3. The off-grid inverter of claim 1, wherein: The motherboard (2) is connected to a communication device (12) and a control board (13) at its front and rear ends, respectively.

4. The off-grid inverter of claim 3, wherein: The control board (13) has a connector terminal (14) at the bottom. The control board (13) is connected to the motherboard (2) through the connector terminal (14). The motherboard (2) is fixed to the control board (13) through fasteners (15).

5. The off-grid inverter of claim 3, wherein: The PV module (3) includes a PV inductor (301) and a heat sink (302) disposed between the PV inductor (301) and the control board (13). The inverter module (4) includes an inverter inductor (401) and a heat sink (402). The DC-DC module (5) includes a step-up transformer (501) and a heat sink (502). The heat sink (402) and the heat sink (502) are disposed between the inverter inductor (401) and the step-up transformer (501).

6. The off-grid inverter of claim 1, wherein: The housing (1) includes a base (101) and a junction box cover (102) located on the front side of the base (101), and an upper cover (103) located on the rear side of the base (101). A partition (104) is provided between the upper cover (103) and the junction box cover (102).

7. Off-grid inverter according to claim 6, characterized in that: A fan (16) is provided on the side of the partition (104) near the battery module (6).

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