Miniature photovoltaic transformer

Abstract

The utility model relates to the technical field of photovoltaic inverters, in particular to a miniature photovoltaic transformer which comprises an insulating base and a transformer body, and the transformer body comprises a main cylinder and an auxiliary cylinder. According to the utility model, the main cylinder body and the auxiliary cylinder body are designed, the length of the auxiliary cylinder body is smaller than that of the main cylinder body, and the auxiliary cylinder body is fixedly sleeved on the outer side of the main cylinder body, so that the primary side coil and the first auxiliary side coil are wound on the main cylinder body along the axial direction of the main cylinder body, and the second auxiliary side coil is wound on the auxiliary cylinder body; the primary side coil and the first secondary side coil form a first group of transformation ratio, and the primary side coil and the second secondary side coil form a second group of transformation ratio, so that the problem that the voltage difference generated by a single solar photovoltaic array in different periods is relatively large is solved, and the problems of unstable voltage output and low efficiency caused by the same transformation ratio are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic inverters, in particular to a miniature photovoltaic transformer. Background Art

[0002] The combination of micro-inverters and a single solar photovoltaic array to form an AC module has become a very promising design; micro-photovoltaic grid-connected inverters have the advantages of high efficiency, simple and convenient expansion, easy installation, and high overall reliability. Micro-inverters are usually used in combination in arrays.

[0003] The micro inverter mainly includes a primary side, a secondary side and a skeleton structure for fixing the primary side and the secondary side. However, since the voltages generated by a single solar photovoltaic array at different times vary greatly, a single transformer (a transformer with a fixed transformation ratio) cannot meet the usage requirements. Therefore, the utility model provides a transformer for micro photovoltaics. Summary of the invention

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a miniature photovoltaic transformer.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A miniature photovoltaic transformer, comprising:

[0007] An insulating base, wherein a plurality of mounting openings are provided on the top of the insulating base;

[0008] A transformer body, wherein the bottom end of the transformer body has a threaded column, and the threaded column is threadedly connected to the mounting port;

[0009] Among them, the transformer body includes: a main cylinder body and a secondary cylinder body. The length of the secondary cylinder body is smaller than that of the main cylinder body. The secondary cylinder body is fixedly sleeved on the outside of the main cylinder body. The primary coil and the first secondary coil are wound on the main cylinder body along the axial direction of the main cylinder body, and the second secondary coil is wound on the secondary cylinder body.

[0010] As a further description of the above technical solution:

[0011] A core column is fixedly connected inside the main cylinder body. The core column includes an iron core, and the bottom end of the iron core is fixedly connected to a threaded column.

[0012] As a further description of the above technical solution:

[0013] The main cylinder includes: a large diameter cylinder, a small diameter cylinder, and a transition section. The two ends of the transition section are respectively fixedly connected to the large diameter cylinder and the small diameter cylinder. The end of the large diameter cylinder away from the transition section is fixedly connected to a first flange ring, and the end of the small diameter cylinder away from the transition section is fixedly connected to a second flange ring.

[0014] As a further description of the above technical solution:

[0015] The first flange ring has a ring portion located inside the large-diameter cylinder, and the inner diameter of the first flange ring corresponds to the core.

[0016] As a further description of the above technical solution:

[0017] The secondary cylinder body comprises a sleeve member, one end of which is fixedly connected to the transition section, and one end of which is away from the transition section is fixedly connected to a third flange ring.

[0018] As a further description of the above technical solution:

[0019] The sleeve piece is sleeved on the outer side of the small-diameter cylinder.

[0020] As a further description of the above technical solution:

[0021] A partition opening is provided at the bottom of the insulating base.

[0022] The utility model has the following beneficial effects:

[0023] Compared with the prior art, the transformer for miniature photovoltaic use is designed with a main cylinder and a secondary cylinder structure. The length of the secondary cylinder is smaller than that of the main cylinder, and the secondary cylinder is fixedly sleeved on the outside of the main cylinder, thereby realizing winding of the primary coil and the first secondary coil on the main cylinder along the axial direction of the main cylinder, and winding of the second secondary coil on the secondary cylinder. The primary coil and the first secondary coil form a first set of transformation ratios, and the primary coil and the second secondary coil form a second set of transformation ratios, thereby adapting to the large difference in voltages generated by a single solar photovoltaic array at different times, and solving the problem that the same transformation ratio will cause unstable voltage output and low efficiency.

[0024] Compared with the prior art, this micro photovoltaic transformer is designed with an insulating base with several mounting openings on the top, so that the threaded column at the bottom of the transformer body is threadedly connected to the mounting opening, thereby enabling rapid installation of multiple transformer bodies and achieving efficient and rapid assembly and expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is a three-dimensional schematic diagram of a miniature photovoltaic transformer.

[0026] Figure 2The present invention is a three-dimensional schematic diagram of a transformer body of a miniature photovoltaic transformer proposed by the present invention.

[0027] Figure 3 This is a schematic diagram of the disassembly of a transformer body of a micro photovoltaic transformer proposed in the utility model.

[0028] Legend:

[0029] 1. Insulating base; 2. Partition; 3. Installation port; 4. Transformer body; 401. Main cylinder; 4011. Large diameter cylinder; 4012. Small diameter cylinder; 4013. First flange ring; 4014. Transition section; 4015. Second flange ring; 402. Secondary cylinder; 4021. Sleeve piece; 4022. Third flange ring; 403. Core column; 4031. Threaded column; 4032. Iron core; a. Primary coil; b. First secondary coil; c. Second secondary coil. DETAILED DESCRIPTION

[0030] Reference Figure 1-Figure 3 The utility model provides a miniature photovoltaic transformer, comprising: an insulating base 1 and a transformer body 4, wherein 6, 8, 16 or other suitable numbers of transformer bodies 4 can be installed on one insulating base 1, and it is easy to install and expand when in use.

[0031] One installation method of the insulating base 1 and the transformer body 4 is: a plurality of installation openings 3 are opened on the top of the insulating base 1, and the plurality of installation openings 3 are arranged in a rectangular array. A threaded column 4031 is provided at the bottom end of the transformer body 4, and the threaded column 4031 is threadedly connected to the installation opening 3 to achieve fixed installation of the insulating base 1 and the transformer body 4.

[0032] Among them, the transformer body 4 includes: a main cylinder 401 and a secondary cylinder 402. The length of the secondary cylinder 402 is smaller than that of the main cylinder 401, and the secondary cylinder 402 is fixedly sleeved on the outside of the main cylinder 401. The main cylinder 401 is wound with a primary coil a and a first secondary coil b along the axial direction of the main cylinder 401, and the secondary cylinder 402 is wound with a second secondary coil c. The secondary cylinder 402 cannot completely cover the main cylinder 401. It is generally required that the primary coil a on the main cylinder 401 cannot be located on the inner side of the second secondary coil c on the secondary cylinder 402, so as to reduce the phenomenon of eddy current heating.

[0033] The primary coil a and the first secondary coil b form a first set of transformation ratios, and the primary coil a and the second secondary coil c form a second set of transformation ratios, thereby adapting to the large difference in voltage generated by a single solar photovoltaic array at different times, and solving the problem that the same transformation ratio will cause unstable voltage output and low efficiency.

[0034] In one embodiment, a core column 403 is fixedly connected inside the main cylinder body 401 . The core column 403 includes an iron core 4032 . The bottom end of the iron core 4032 is fixedly connected to a threaded column 4031 .

[0035] The transformer relies on the iron core magnetic flux conversion to transform the voltage. Transformers without iron core are only suitable for high-frequency transformation. Transformers with iron core 4032 can adapt to most application scenarios.

[0036] In one embodiment, the main cylinder 401 includes: a large diameter cylinder 4011, a small diameter cylinder 4012, and a transition section 4014. The two ends of the transition section 4014 are fixedly connected to the large diameter cylinder 4011 and the small diameter cylinder 4012 respectively. The large diameter cylinder 4011, the small diameter cylinder 4012, and the transition section 4014 are an integrated structure. The end of the large diameter cylinder 4011 away from the transition section 4014 is fixedly connected to the first flange ring 4013, and the end of the small diameter cylinder 4012 away from the transition section 4014 is fixedly connected to the second flange ring 4015.

[0037] Both the first flange ring 4013 and the second flange ring 4015 have a portion extending outwardly for limiting the coils (referring to the primary coil a and the first secondary coil b) from sliding toward both sides. The first flange ring 4013 also has a ring portion located on the inner side of the large diameter cylinder 4011. The inner diameter of the first flange ring 4013 corresponds to the iron core 4032, so that the iron core 4032 can be stably fixed on the inner side of the main cylinder 401.

[0038] In one embodiment, the secondary cylinder body 402 includes: a sleeve member 4021 , one end of the sleeve member 4021 is fixedly connected to the transition section 4014 , and can be fixed by glue, and one end of the sleeve member 4021 away from the transition section 4014 is fixedly connected to a third flange ring 4022 .

[0039] When the transformer body 4 is specifically manufactured, two groups of coils are firstly wound on the large diameter cylinder 4011 and the small diameter cylinder 4012 of the main cylinder 401 (the primary coil a is wound on the large diameter cylinder 4011, and the first secondary coil b is wound on the small diameter cylinder 4012), the two groups of coils are separated by the transition section 4014, and then the second secondary coil c is wound on the auxiliary cylinder 402, and finally the end of the auxiliary cylinder 402 without the third flange ring 4022 is fixed to the transition section 4014 by glue. The design of this structure simplifies the coil winding process, thereby reducing the manufacturing cost.

[0040] In one embodiment, the sleeve member 4021 is sleeved on the outside of the small-diameter cylinder 4012, that is, the first secondary coil b and the second secondary coil c are an inner and outer layer structure. Since the first secondary coil b and the second secondary coil c do not need to be used at the same time, there is basically no interference problem between the two.

[0041] In one embodiment, a partition opening 2 is provided at the bottom of the insulating base 1 to reduce the material for positioning the insulating base 1 and reduce the manufacturing cost of the insulating base 1 .

[0042] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A transformer for micro photovoltaic, characterized in that: include: An insulating base (1), wherein a plurality of mounting openings (3) are provided on the top of the insulating base (1); A transformer body (4), wherein the bottom end of the transformer body (4) has a threaded column (4031), and the threaded column (4031) is threadedly connected to the mounting opening (3); The transformer body (4) comprises: a main cylinder (401) and a secondary cylinder (402); the length of the secondary cylinder (402) is smaller than that of the main cylinder (401); the secondary cylinder (402) is fixedly sleeved on the outside of the main cylinder (401); a primary coil (a) and a first secondary coil (b) are wound on the main cylinder (401) along the axial direction of the main cylinder (401); and a second secondary coil (c) is wound on the secondary cylinder (402).

2. A miniature photovoltaic transformer according to claim 1, characterized in that: A core column (403) is fixedly connected to the interior of the main cylinder (401), the core column (403) comprises an iron core (4032), and the bottom end of the iron core (4032) is fixedly connected to a threaded column (4031).

3. A miniature photovoltaic transformer according to claim 2, characterized in that: The main cylinder (401) comprises: a large-diameter cylinder (4011), a small-diameter cylinder (4012), and a transition section (4014); two ends of the transition section (4014) are respectively fixedly connected to the large-diameter cylinder (4011) and the small-diameter cylinder (4012); one end of the large-diameter cylinder (4011) away from the transition section (4014) is fixedly connected to a first flange ring (4013); and one end of the small-diameter cylinder (4012) away from the transition section (4014) is fixedly connected to a second flange ring (4015).

4. A micro photovoltaic transformer according to claim 3, characterized in that: The first flange ring (4013) has a ring portion located inside the large-diameter cylinder (4011), and the inner diameter of the first flange ring (4013) corresponds to the iron core (4032).

5. A miniature photovoltaic transformer according to claim 3, characterized in that: The secondary cylinder body (402) comprises a sleeve member (4021), one end of the sleeve member (4021) being fixedly connected to the transition section (4014), and one end of the sleeve member (4021) away from the transition section (4014) being fixedly connected to a third flange ring (4022).

6. A micro photovoltaic transformer according to claim 5, characterized in that: The sleeve member (4021) is sleeved on the outside of the small-diameter cylinder (4012).

7. A micro photovoltaic transformer according to claim 1, characterized in that: A partition opening (2) is provided at the bottom of the insulating base (1).

Images