Photovoltaic transformer

Abstract

The utility model provides a photovoltaic transformer. The photovoltaic transformer comprises an upper magnetic core and a lower magnetic core which are arranged in a stacked mode in the first direction. The transformer further comprises a primary winding and a secondary winding, the primary winding and the secondary winding are arranged between the upper magnetic core and the lower magnetic core and arranged in the second direction perpendicular to the first direction, and at least part of the primary winding and at least part of the secondary winding are overlapped. The primary winding and the secondary winding are partially overlapped, so that the thicknesses of the primary winding and the secondary winding in the first direction are effectively reduced, the thickness of the photovoltaic transformer is reduced, the photovoltaic transformer tends to be flat and miniaturized, meanwhile, leakage inductance is effectively reduced, and the efficiency of the photovoltaic transformer is improved.

Description

Technical Field

[0001] The present application relates to the field of transformers, and in particular to a photovoltaic transformer. Background Art

[0002] With the increasing demand for electricity, photovoltaic transformers are widely used in urban power grids, rural power, industrial and commercial places, emergency power supply and other fields. Photovoltaic transformers can include DC transformers, intelligent transformers, single-phase transformers or marine transformers. The existing photovoltaic transformers are relatively thick, which affects the aesthetics and also reduces the utilization rate of the core window. Utility Model Content

[0003] The present application provides a photovoltaic transformer with reduced thickness.

[0004] An embodiment of the present application provides a photovoltaic transformer, comprising an upper magnetic core and a lower magnetic core stacked along a first direction, and also comprising a primary winding and a secondary winding, wherein the primary winding and the secondary winding are arranged between the upper magnetic core and the lower magnetic core, and arranged along a second direction perpendicular to the first direction, and at least part of the primary winding overlaps with at least part of the secondary winding.

[0005] In some embodiments, the photovoltaic transformer of the above technical solution includes an upper magnetic core and a lower magnetic core stacked along a first direction, and arranged along a second direction perpendicular to the first direction, and at least part of the primary winding overlaps with at least part of the secondary winding, thereby realizing flattening and miniaturization of the photovoltaic transformer.

[0006] Furthermore, the secondary winding is located in a space surrounded by the primary winding.

[0007] Furthermore, the primary winding comprises an inner coil and an outer coil connected in series, a first space is defined between the inner coil and the outer coil, and the secondary winding is located in the first space.

[0008] In some embodiments, the above technical solution places the secondary winding completely in the space of the secondary winding. In the first direction, the secondary winding and the primary winding are at the same horizontal height, and the primary winding and the secondary winding are in a sandwich winding structure, thereby effectively reducing leakage inductance.

[0009] Further, along the first direction, the outer coil is higher than the secondary winding.

[0010] Furthermore, the secondary winding includes a plurality of annular copper bars sleeved together.

[0011] In some embodiments, the above technical solution arranges multiple annular copper busbars together, which can effectively reduce high-frequency losses.

[0012] Furthermore, the photovoltaic transformer also includes a skeleton, which includes a main body and a first fixing part and a second fixing part arranged on the main body. Along the first direction, the primary winding and the secondary winding are crimped on the main body, the primary winding includes a lead-out part, and the lead-out part is fixed on the first fixing part. The secondary winding includes an introduction part, and the introduction part is fixed on the second fixing part.

[0013] In some embodiments, the skeleton of the above technical solution is not provided with wire grooves, which reduces the thickness and makes the overall thickness of the photovoltaic transformer smaller.

[0014] Furthermore, the frame is provided with a first limiting hole and a second limiting hole, the lead-out portion passes through the first limiting hole, and the lead-in portion passes through the second limiting hole.

[0015] In some embodiments, the above technical solution makes the secondary winding and the primary winding more firmly fixed to the frame.

[0016] Furthermore, the upper magnetic core is provided with a pair of first avoidance gaps for allowing the lead-out portion and the lead-in portion to pass through respectively, and the lower magnetic core is provided with a pair of second avoidance gaps for allowing the first fixing portion and the second fixing portion to pass through respectively.

[0017] In some embodiments, the above technical solution achieves maximum space utilization and reduces the overall volume of the photovoltaic transformer by setting notches on the upper magnetic core and the lower magnetic core so that the first fixed part and the second fixed part of the skeleton, the lead-in part of the secondary winding and the lead-out part of the primary winding cooperate with the notches.

[0018] Further, the first limiting holes are arranged as a pair, and the lead-out portion comprises a first lead-out wire and a second lead-out wire, the first lead-out wire is connected to the inner coil and passes through one of the first limiting holes; the second lead-out wire is connected to the outer coil and passes through another of the first limiting holes.

[0019] In some embodiments, the above technical solution makes the lead-out portion of the primary winding more firmly fixed to the frame.

[0020] Furthermore, the second limiting hole is set as a pair, the introduction part includes a first introduction part, a second introduction part and a connecting part connecting the first introduction part and the second introduction part, the first introduction part is connected to the annular copper busbar, and the second introduction part is located on the outside of the outer coil and passes through the second limiting hole.

[0021] In some embodiments, the lead-in part of the secondary winding of the above technical solution is more firmly fixed to the frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a perspective view of a photovoltaic transformer according to an exemplary embodiment of the present application.

[0023] Figure 2 yes Figure 1 A perspective view of the photovoltaic transformer shown in another perspective.

[0024] Figure 3 yes Figure 1 A top view of a photovoltaic transformer is shown.

[0025] Figure 4 yes Figure 3 The schematic cross-sectional view of the photovoltaic transformer along line AA is shown.

[0026] Figure 5 yes Figure 1 An exploded view of a photovoltaic transformer is shown.

[0027] Figure 6 yes Figure 5 A perspective view of the upper magnetic core is shown.

[0028] Figure 7 yes Figure 5 A perspective view of the lower magnetic core is shown.

[0029] Figure 8 yes Figure 5 A three-dimensional view of the primary winding is shown.

[0030] Fig. 9 yes Figure 5 A perspective view of the secondary winding is shown.

[0031] Fig.10 yes Figure 5 A stereogram of the skeleton shown.

[0032] Fig.11 yes Figure 5 A three-dimensional view of the secondary winding, primary winding and frame after assembly is shown.

[0033] Fig.12 yes Fig. 9 The expanded view of the annular copper busbar is shown.

[0034] Explanation of the accompanying drawings: 1. upper magnetic core; 11. first avoidance gap; 12. upper positioning column; 13. first fixing groove; 2. lower magnetic core; 21. second avoidance gap; 22. lower positioning column; 13. second fixing groove; 3. skeleton; 31. second fixing part; 311. second limiting hole; 32. first fixing part; 321. first limiting hole; 33. main body; 4. primary winding; 41. lead-out part; 42. inner coil; 421. first lead-out wire; 43. outer coil; 431. second lead-out wire; 44. first space; 5. secondary winding; 51. lead-in part; 511. first lead-in part; 512. second lead-in part; 513. connecting part; 514. second bending part; 52. annular copper busbar; 53. groove; 531. overlapping part; 54. lead-in foot; 541. first bending part. DETAILED DESCRIPTION

[0035] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices consistent with some aspects of the present application as detailed in the appended claims.

[0036] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantitative limit, but indicate that there is at least one. "Multiple" or "several" means two or more. Unless otherwise specified, words such as "front", "rear", "lower" and / or "upper" are only for the convenience of explanation and are not limited to one position or one spatial orientation. Words such as "include" or "comprise" mean that the elements or objects appearing in front of "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, and can include electrical connections, whether direct or indirect. The singular forms "a", "said" and "the" used in this specification and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0037] See also Figure 1 to Figure 2 As shown, the photovoltaic transformer includes an upper magnetic core 1 and a lower magnetic core 2 fixed together. The upper magnetic core 1 and the lower magnetic core 2 are arranged along a first direction ( Figure 1 (direction of arrow in the middle) overlay settings.

[0038] See also Figure 3 to Figure 4 As shown, the lower surface of the upper magnetic core 1 is against the lower magnetic core 2. The upper magnetic core 1 is provided with a first positioning column 12, which extends along a first direction. The lower magnetic core 2 is provided with a second positioning column 22, which extends in a direction opposite to the first direction.

[0039] The photovoltaic transformer also includes a primary winding 4 and a secondary winding 5, and the secondary winding 5 and the primary winding 4 are both arranged between the upper magnetic core 1 and the lower magnetic core 2, along a second direction perpendicular to the first direction ( Figure 4 The primary winding 4 is arranged in the direction of the middle arrow, and at least a part of the primary winding 4 overlaps with at least a part of the secondary winding 5.

[0040] The lower surface of the first positioning post 12 abuts against the second positioning post 22 , and the primary winding 4 and the secondary winding 5 are both sleeved on the first positioning post 12 and the second positioning post 22 .

[0041] See also Figure 5As shown, the photovoltaic transformer includes a skeleton 3 , and the secondary winding 5 , the primary winding 4 and the skeleton 3 are all arranged between the upper magnetic core 1 and the lower magnetic core 2 .

[0042] See also Figure 6 to Figure 7 As shown, a pair of first avoidance gaps 11 are provided on the upper magnetic core 1. In this embodiment, the two first avoidance gaps 11 are arranged opposite to each other. Two first fixing grooves 13 are also provided on both sides of the upper magnetic core 1. The two first fixing grooves 13 are arranged opposite to each other, and the first fixing grooves 13 and the first avoidance gaps 11 are located on different sides of the upper magnetic core 1.

[0043] Two second fixing grooves 23 are formed on both sides of the lower magnetic core 2 . The two second fixing grooves 23 are arranged opposite to each other, and the second fixing grooves 23 and the second avoiding gaps 21 are located on different sides of the upper magnetic core 1 .

[0044] The first fixing groove 13 is disposed above the second fixing groove 23 , and can be snap-fitted into the first fixing groove 13 and the second fixing groove 23 , thereby fixing the relative positions of the upper magnetic core 1 and the lower magnetic core 2 .

[0045] See also Figure 8 As shown, the primary winding 4 includes an inner coil 42 and an outer coil 43, and the inner coil 42 and the outer coil 43 are connected in series. In the present embodiment, the primary winding 4 is wound by a wire, and the wire is firstly wound around the inner wall of the secondary winding 5, and then the wire is wound around the outer wall of the secondary winding 5, and then the wire is wound around the outer wall of the secondary winding 5, and then the wire is wound upward along the bottom of the outer wall of the secondary winding 5 for six turns to form the outer coil 43. The inner coil 42 is parallel to the outer coil 43, and a first space 44 is provided between the inner coil 42 and the outer coil 43.

[0046] The primary winding 4 further includes a lead-out portion 41 , and the lead-out portion 41 includes a first lead-out wire 421 and a second lead-out wire 431 . The first lead-out wire 421 is connected to the inner coil 42 , and the second lead-out wire 431 is connected to the outer coil 43 .

[0047] See also Fig. 9 As shown, the secondary winding 5 includes a plurality of annular copper bars 52 sleeved together, and the secondary winding also includes an introduction portion 51 and an introduction foot 54. The annular copper bars 52 are connected to the introduction portion 51 and the introduction foot 54 respectively. In this embodiment, the unfolded state of the secondary winding 5 is as shown in FIG. Fig.12As shown, the secondary winding 5 is wound by a complete copper bar. First, the annular copper bar 52 is wound in one circle so that the lead-in foot 54 is wound around the position of the groove 53. At this time, the first bent portion 541 connected to the lead-in foot 54 and the annular copper bar 52 is clamped in the groove 53, and then the winding is continued. The lead-in foot 54 is wound around the position of the lead-in part 51. At this time, the lead-in foot 54, the lead-in part 51 and the groove 53 are all located on the same straight line. The second bent portion 514 connected to the lead-in part 51 and the annular copper bar 52 overlaps with the overlapping portion 531 above the groove 53. Thereafter, the lead-in part 51 is bent so that the lead-in part 51 and the lead-in foot 54 both extend along the first direction.

[0048] The introduction part 51 includes a first introduction part 511, a second introduction part 512 and a connecting part 513. The first introduction part 511 and the second introduction part 512 are connected through the connecting part 513. In this embodiment, the second introduction part 512 and the introduction foot 54 are parallel to each other, and the connecting part 513 is perpendicular to the first introduction part 411 and the second introduction part 512 respectively.

[0049] See also Fig.10 As shown, the frame 3 includes a main body 33 and a first fixing portion 32 and a second fixing portion 31 disposed on the main body 33 . In this embodiment, the first fixing portion 32 and the second fixing portion 31 are disposed opposite to each other and are located on both sides of the main body 33 .

[0050] The first fixing portion 32 is provided with a pair of first limiting holes 321, and the second fixing portion 31 is provided with a pair of second limiting holes 311. Figure 5 As shown, the lead-out portion 41 passes through the first limiting hole 321 , and the lead-in portion 51 passes through the second limiting hole 311 .

[0051] See also Fig.11 As shown, the secondary winding 5 is disposed in the first space 44. Along the first direction, the primary winding 4 and the secondary winding 5 are crimped onto the main body 33 of the frame 3, the lead-out portion 41 is fixed onto the first fixing portion 32, and the lead-in portion 51 is fixed onto the second fixing portion 31.

[0052] The first lead wire 421 is connected to the inner coil 42 and passes through one of the first limiting holes 321, and the second lead wire 431 is connected to the outer coil 43 and passes through the other first limiting hole 321; the second lead-in portion 512 is arranged on the outside of the outer coil 43 and passes through one of the second limiting holes 311, and the lead-in foot 54 is connected to the annular copper bus 52 and passes through the other second limiting hole 311.

[0053] The lead-out portion 41 and the lead-in portion 51 respectively pass through a pair of first avoidance notches 11 , and the first fixing portion 32 and the second fixing portion 31 respectively pass through a pair of second avoidance notches 21 .

[0054] See also Fig.12 As shown, when the secondary winding 5 is in the unfolded state, an introduction portion 51 and an introduction foot 54 are respectively provided at both ends of the annular copper bar 52, the introduction foot 54 is parallel to the introduction portion 51, and the introduction foot 54 and the introduction portion 51 are both perpendicular to the annular copper bar 52, and a groove 53 is opened on the annular copper bar 52, and the distance from the groove 53 to the introduction foot 54 is 50mm to 90mm.

[0055] The above is only a preferred implementation mode of the present application, and does not constitute any form of limitation to the present application. Although the present application has been disclosed as a preferred implementation mode as above, it is not used to limit the present application. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent implementation modes without departing from the scope of the technical solution of the present application. However, any simple modification, equivalent change and modification made to the above implementation modes based on the technical essence of the present application without departing from the content of the technical solution of the present application still fall within the scope of the technical solution of the present application.

Claims

1. A photovoltaic transformer, comprising: The upper magnetic core and the lower magnetic core are stacked along a first direction, characterized in that they also include: a primary winding and a secondary winding, wherein the primary winding and the secondary winding are arranged between the upper magnetic core and the lower magnetic core, and are arranged along a second direction perpendicular to the first direction, at least part of the primary winding overlaps with at least part of the secondary winding, and the secondary winding is located in a space surrounded by the primary winding, the primary winding includes an inner coil and an outer coil connected in series, a first space is provided between the inner coil and the outer coil, and the secondary winding is located in the first space.

2. The photovoltaic transformer according to claim 1, characterized in that: Along the first direction, the outer coil is higher than the secondary winding.

3. The photovoltaic transformer according to claim 1, characterized in that: The secondary winding includes a plurality of annular copper bars sleeved together.

4. The photovoltaic transformer according to claim 3, characterized in that: It also includes a skeleton, which includes a main body and a first fixing part and a second fixing part arranged on the main body. Along the first direction, the primary winding and the secondary winding are crimped on the main body. The primary winding includes a lead-out part, which is fixed on the first fixing part. The secondary winding includes an introduction part, which is fixed on the second fixing part.

5. The photovoltaic transformer according to claim 4, characterized in that: The frame is provided with a first limiting hole and a second limiting hole, the lead-out portion passes through the first limiting hole, and the lead-in portion passes through the second limiting hole.

6. The photovoltaic transformer according to claim 4, characterized in that: The upper magnetic core is provided with a pair of first avoidance gaps for respectively allowing the lead-out portion and the lead-in portion to pass through, and the lower magnetic core is provided with a pair of second avoidance gaps for respectively allowing the first fixing portion and the second fixing portion to pass through.

7. The photovoltaic transformer according to claim 5, characterized in that: The first limiting holes are arranged as a pair, and the lead-out portion comprises a first lead-out wire and a second lead-out wire, the first lead-out wire is connected to the inner coil and passes through one of the first limiting holes; the second lead-out wire is connected to the outer coil and passes through the other first limiting hole.

8. The photovoltaic transformer according to claim 7, characterized in that: The second limiting holes are arranged as a pair, the introduction part comprises a first introduction part, a second introduction part and a connecting part connecting the first introduction part and the second introduction part, the first introduction part is connected to the annular copper busbar, and the second introduction part is located on the outside of the outer coil and passes through the second limiting hole.

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