Photovoltaic inverter grid-side inductor

Abstract

The utility model discloses a photovoltaic inverter network side inductor, which comprises a magnetic core comprising an upper yoke and a lower yoke which are arranged in parallel, a first middle column, a second middle column and a third middle column are respectively connected between the upper yoke and the lower yoke, and a first side column and a second side column are respectively connected between two ends of the upper yoke and the lower yoke; the upper yoke and the lower yoke are equal in sectional area, the first middle column, the second middle column and the third middle column are equal in sectional area, and the first side column and the second side column are equal in sectional area. The sectional areas of the upper yoke and the lower yoke are respectively half of the sectional area of the first middle column or the second middle column or the third middle column; the sectional areas of the first side column and the second side column are respectively half of the sectional area of the upper yoke or the lower yoke; the coil winding is wound on the first middle column, the second middle column and the third middle column, and the coil winding is provided with an outgoing line; and the base is arranged on the upper yoke and the lower yoke and is used for isolating the upper yoke, the lower yoke and the coil winding. According to the utility model, the problem that the grid-side inductor of the photovoltaic inverter cannot meet the requirements of low-height, low-width and large-length spaces is solved.

Description

Technical Field

[0001] This utility model relates to the field of inductor technology, and in particular to a grid-side inductor for a photovoltaic inverter. Background Technology

[0002] The grid-side inductor of a photovoltaic (PV) inverter is a key component between the inverter output and the grid. It primarily filters and suppresses high-frequency noise, ensuring the inverter's output current waveform meets grid connection requirements. Traditional PV inverter grid-side inductors have upper and lower yoke cross-sectional areas equal to or similar to the center column cross-sectional area, and their heights equal to or similar to the center column width. However, the installation space for PV grid-side inductors typically results in a low, flat, and long profile—low height, low width, and long length—which conflicts with the structural design of Chuangtong's PV inverter grid-side inductors, making their implementation impossible. Utility Model Content

[0003] The main purpose of this invention is to provide a grid-side inductor for a photovoltaic inverter, which aims to solve the problem that traditional grid-side inductors for photovoltaic inverters cannot meet the requirements of low height, low width and long length spaces.

[0004] To achieve the above objectives, this utility model proposes a grid-side inductor for a photovoltaic inverter, comprising:

[0005] A magnetic core includes an upper yoke and a lower yoke arranged in parallel. A first central post, a second central post, and a third central post are respectively connected between the upper yoke and the lower yoke. A first side post and a second side post are respectively connected between the two ends of the upper yoke and the lower yoke. The cross-sectional areas of the upper yoke and the lower yoke are equal. The cross-sectional areas of the first central post, the second central post, and the third central post are equal. The cross-sectional areas of the first side post and the second side post are equal. The cross-sectional areas of the upper yoke and the lower yoke are each half the cross-sectional area of ​​the first central post, the second central post, or the third central post. The cross-sectional areas of the first side post and the second side post are each half the cross-sectional area of ​​the upper yoke or the lower yoke.

[0006] A coil winding is wound around the first, second, and third center posts, and the coil winding is provided with lead wires;

[0007] A base, mounted on the upper and lower yokes, is used to isolate the upper and lower yokes from the coil windings.

[0008] Optionally, the magnetic core is configured as an iron-silicon metal powder core.

[0009] Optionally, the first, second, and third central columns are arranged at equal intervals along the length of the grid-side inductor of the photovoltaic inverter.

[0010] Optionally, the magnetic core is configured as a one-piece molded structure.

[0011] Optionally, the surfaces of the upper and lower yokes are coated with an insulating epoxy resin layer.

[0012] Optionally, the base is configured as an integrally molded structure made of insulating material.

[0013] Optionally, the base is provided with mounting holes for fixing the grid-side inductor of the photovoltaic inverter.

[0014] Optionally, the coil winding is made of enameled flat wire.

[0015] The beneficial effects of this invention are as follows: It improves the structure of existing photovoltaic inverter grid-side inductors. By rationally allocating the cross-sectional areas of the upper and lower yokes and the central column, the overall height of the magnetic core is optimized. While maintaining necessary inductance performance, the cross-sectional areas of the upper and lower yokes are reduced to half the cross-sectional area of ​​the central column, thus lowering the height of the magnetic core. This better adapts to the low height requirements of photovoltaic inverter grid-side inductor installation space, improving the feasibility of inductor installation in limited spaces. The proportional relationship of the cross-sectional areas between the upper and lower yokes and the central and side columns makes the magnetic core more compact in the width direction and allows for better extension in the length direction. This fully utilizes the length advantage of the installation space, avoids conflicts with the shape of the installation space, and enables more efficient installation at specific locations on the photovoltaic inverter, improving space utilization. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the grid-side inductor of the photovoltaic inverter of this utility model;

[0018] Figure 2 This is an exploded view of the overall structure of the grid-side inductor of the photovoltaic inverter of this utility model;

[0019] Figure 3 This is a schematic diagram of the magnetic core structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the upper and lower yoke sections of this utility model;

[0021] Figure 5 This is a schematic diagram of the cross-section of the central column and the side columns of this utility model;

[0022] Label Explanation:

[0023] 1. Magnetic core; 11. Upper yoke; 12. Lower yoke; 13. First central post; 14. Second central post; 15. Third central post; 16. First side post; 17. Second side post;

[0024] 2. Coil winding;

[0025] 3. Base; 31. Fixing hole.

[0026] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0027] 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.

[0028] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0029] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0030] One embodiment of this utility model provides a grid-side inductor for a photovoltaic inverter, with reference to... Figures 1 to 5 ,include:

[0031] The magnetic core 1 includes an upper yoke 11 and a lower yoke 12 arranged in parallel. A first central post 13, a second central post 14, and a third central post 15 are respectively connected between the upper yoke 11 and the lower yoke 12. A first side post 16 and a second side post 17 are respectively connected between the two ends of the upper yoke 11 and the lower yoke 12. The cross-sectional areas of the upper yoke 11 and the lower yoke 12 are equal. The cross-sectional areas of the first central post 13, the second central post 14, and the third central post 15 are equal. The cross-sectional areas of the first side post 16 and the second side post 17 are equal. The cross-sectional areas of the upper yoke 11 and the lower yoke 12 are each half the cross-sectional area of ​​the first central post 13, the second central post 14, or the third central post 15. The cross-sectional areas of the first side post 16 and the second side post 17 are each half the cross-sectional area of ​​the upper yoke 11 or the lower yoke 12.

[0032] The coil winding 2 is wound around the first central column 13, the second central column 14 and the third central column 15, and the coil winding 2 is provided with lead wires;

[0033] The base 3 is installed on the upper yoke 11 and the lower yoke 12 to isolate the upper yoke 11, the lower yoke 12 and the coil winding 2.

[0034] In this embodiment, the structure of the existing photovoltaic inverter grid-side inductor is improved, and its spatial adaptability is optimized to meet installation requirements. Specifically, by rationally allocating the cross-sectional areas of the upper and lower yokes 12 and the central column, the overall height of the magnetic core 1 is optimized. While maintaining the necessary inductance performance, the cross-sectional areas of the upper and lower yokes 12 are reduced to half the cross-sectional area of ​​the central column, which lowers the height of the magnetic core 1. This better adapts to the low height requirements of the photovoltaic inverter grid-side inductor installation space and improves the feasibility of inductor installation in limited space. The cross-sectional area ratio between the upper yoke 11, lower yoke 12, central column, and side column makes the magnetic core 1 more compact in the width direction and allows for better extension in the length direction. This fully utilizes the length advantage of the installation space, avoids conflicts with the shape of the installation space, and enables more efficient installation at specific locations on the photovoltaic inverter, improving space utilization.

[0035] Furthermore, the magnetic core 1 is configured as an iron-silicon metal powder core. In this embodiment, the iron-silicon metal powder core 1 has a distributed air gap, and the central column does not have a separate physical air gap, which can avoid the eddy current loss of the coil caused by the magnetic flux effect at the air gap edge; at the same time, the iron-silicon metal powder core has soft saturation characteristics, which solves the problem of saturation at twice the rated current peak, and still has more than 30% of the initial inductance at twice the rated current peak.

[0036] Furthermore, the first central column 13, the second central column 14, and the third central column 15 are arranged at equal intervals along the length of the grid-side inductor of the photovoltaic inverter. In this embodiment, the equally spaced central columns enable a more uniform magnetic field distribution in the magnetic circuit. When the inductor is operating, current flows through the coil winding 2 to generate a magnetic field. The equally spaced central columns make the distribution of magnetic flux among the columns more reasonable, reducing the non-uniformity of the magnetic field. A uniform magnetic field distribution helps improve the inductance stability and linearity of the inductor, enabling the inductor to maintain relatively consistent electrical performance under different operating conditions, thereby better realizing functions such as filtering and current limiting.

[0037] Furthermore, the magnetic core 1 is configured as a one-piece molded structure. In this embodiment, the one-piece molded magnetic core 1 has better integrity and stability, can better withstand vibration and impact, maintains the shape and performance stability of the magnetic core 1, ensures the inductor works normally in complex environments, and extends the inductor's service life. At the same time, the one-piece molded structure makes the magnetic circuit of the magnetic core 1 more continuous and uniform, reducing the problem of uneven magnetic flux distribution caused by uneven magnetic resistance at the connection points of various parts. Uniform magnetic flux distribution helps to improve the inductance stability and linearity of the inductor, enabling the inductor to maintain relatively consistent electrical performance under different operating conditions, thereby better realizing functions such as filtering and current limiting, and ensuring the power quality output by the photovoltaic inverter.

[0038] Furthermore, the surfaces of the upper yoke 11 and lower yoke 12 are coated with an insulating epoxy resin layer. It should be noted that the insulating epoxy resin layer has excellent insulation properties and can withstand higher voltages. This helps to improve the withstand voltage rating of the inductor, enabling it to maintain stable electrical performance when facing fluctuations in mains voltage or sudden high voltage situations, thus avoiding faults caused by insulation breakdown.

[0039] Furthermore, the base 3 is configured as an integrally molded structure of insulating material. In the grid-side inductor of the photovoltaic inverter, good electrical isolation is required between the upper yoke 11 and the lower yoke 12 and the coil winding 2 to prevent faults such as short circuits. In this embodiment, the insulating base 3 can reliably isolate the upper yoke 11, the lower yoke 12, and the coil winding 2, preventing current from flowing in areas that should not be in contact, and ensuring the electrical safety of the inductor and the entire photovoltaic inverter system. The integrally molded insulating base 3 has uniform insulation properties and can withstand high voltages. When the grid voltage fluctuates or transient overvoltages occur, the base 3 can provide sufficient insulation strength to prevent insulation breakdown and ensure the stable operation of the system.

[0040] Furthermore, the base 3 is provided with mounting holes 31 for fixing the grid-side inductor of the photovoltaic inverter. In this embodiment, the mounting holes 31 are provided on the base 3 of the photovoltaic inverter grid-side inductor, so that the inductor can be directly fixed to the installation position by bolts, screws or other fasteners. This installation method is simple and quick, requiring no complicated installation tools or cumbersome operating steps, greatly simplifying the installation process and improving installation efficiency.

[0041] Furthermore, the coil winding 2 is made of enameled flat wire. It should be noted that, compared to traditional round enameled wire, enameled flat wire has a larger width and smaller thickness for the same cross-sectional area. This shape allows for a more uniform distribution of current within the conductor, thereby reducing the resistance loss of the coil winding 2 and improving the energy conversion efficiency of the inductor.

[0042] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A grid-side inductor for a photovoltaic inverter, characterized in that, include: A magnetic core includes an upper yoke and a lower yoke arranged in parallel. A first central post, a second central post, and a third central post are respectively connected between the upper yoke and the lower yoke. A first side post and a second side post are respectively connected between the two ends of the upper yoke and the lower yoke. The cross-sectional areas of the upper yoke and the lower yoke are equal. The cross-sectional areas of the first central post, the second central post, and the third central post are equal. The cross-sectional areas of the first side post and the second side post are equal. The cross-sectional areas of the upper yoke and the lower yoke are each half the cross-sectional area of ​​the first central post, the second central post, or the third central post. The cross-sectional areas of the first side post and the second side post are each half the cross-sectional area of ​​the upper yoke or the lower yoke. A coil winding is wound around the first, second, and third center posts, and the coil winding is provided with lead wires; A base, mounted on the upper and lower yokes, is used to isolate the upper and lower yokes from the coil windings.

2. The photovoltaic inverter grid-side inductor according to claim 1, characterized in that, The magnetic core is configured as an iron-silicon metal powder core.

3. The photovoltaic inverter grid-side inductor according to claim 1, characterized in that, The first, second, and third central columns are arranged at equal intervals along the length of the grid-side inductor of the photovoltaic inverter.

4. The grid-side inductor of the photovoltaic inverter according to claim 1, characterized in that, The magnetic core is configured as a single-piece molded structure.

5. The grid-side inductor of the photovoltaic inverter according to claim 1, characterized in that, The surfaces of the upper and lower yokes are coated with an insulating epoxy resin layer.

6. The grid-side inductor of the photovoltaic inverter according to claim 1, characterized in that, The base is made of an integrally molded insulating material.

7. The grid-side inductor of the photovoltaic inverter according to claim 1, characterized in that, The base has mounting holes for fixing the grid-side inductor of the photovoltaic inverter.

8. The grid-side inductor of the photovoltaic inverter according to claim 1, characterized in that, The coil winding is made of enameled flat wire.

Images