Transformer and shielding structure

Abstract

A transformer and a shielding structure (5). The transformer comprises a primary conductive unit (2), a secondary conductive unit (3), a core set (4), and a shielding structure (5). The secondary conductive unit (3) and the primary conductive unit (2) are arranged in an interleaved manner. At least one shielding portion (52) of the shielding structure (5) is arranged between at least one primary winding (23) of the primary conductive unit (2) and the secondary conductive unit (3). By arranging a bent shielding structure (5) between the primary conductive unit (2) and the secondary conductive unit (3), shielding can be implemented to reduce electromagnetic interference.

Description

Transformer and shielding structure Technical Field

[0001] This disclosure relates to a transformer and its shielding structure, and more particularly to a transformer and its shielding structure of the interleaved type without winding. Background Technology

[0002] When a power supply is operating, the high-frequency switching of the transformer generates noise at multiple harmonics, resulting in electromagnetic interference (EMI). To eliminate conducted or radiated EMI noise from the transformer, shielding copper foil is typically added between the primary and secondary sides of the transformer and grounded to eliminate the noise.

[0003] However, for bobbin-less interleaved transformers, copper sheets are usually used on the secondary side to improve efficiency due to high current output. However, the tape wrapped around the copper sheets is insufficient to meet the safety specifications for reinforcing insulation distance, making it difficult to connect the shielding copper foil in parallel to the primary side grounding terminal. As a result, the shielding copper foil connected to the secondary side grounding terminal cannot produce a good shielding effect.

[0004] Therefore, in order to overcome the shortcomings and deficiencies of the existing technology, it is necessary to provide an improved transformer and shielding structure to solve the problems existing in the above-mentioned conventional technology. Summary of the Invention

[0005] The main objective of this disclosure is to provide a transformer and a shielding structure that, by placing a bent shielding structure between the primary conductive unit and the secondary conductive unit, can form a shield and reduce electromagnetic interference.

[0006] To achieve the above objectives, this disclosure provides a transformer, which includes a primary conductive unit, a secondary conductive unit, a core assembly, and a shielding structure; the primary conductive unit includes at least one main winding; the secondary conductive unit is alternately arranged with the primary conductive unit; the core assembly has a protrusion and an accommodating space, the main winding and the secondary conductive unit are disposed in the accommodating space and wound around the protrusion; the shielding structure includes at least one bent portion and two shielding portions, the two shielding portions extending from both ends of the bent portion respectively, wherein at least one shielding portion of the shielding structure is disposed between at least one main winding of the primary conductive unit and the secondary conductive unit.

[0007] Optionally, the secondary conductive unit includes two metal sheets, at least one main winding of the primary conductive unit is disposed between the two metal sheets, and at least one shielding part of the shielding structure is disposed between the corresponding main winding and the corresponding metal sheet.

[0008] Optionally, the secondary conductive unit includes multiple metal sheets, multiple main windings of the primary conductive unit are disposed between the multiple metal sheets, and multiple shielding parts of the shielding structure are respectively disposed between the corresponding main windings and the corresponding metal sheets.

[0009] Optionally, each metal sheet has a shoulder, two extensions and an opening, the two extensions being connected to both sides of the shoulder, the opening being formed between the two extensions, and the two shielding portions being located on both sides of the opening.

[0010] Optionally, the plurality of metal sheets are arranged in an alternating manner, such that the openings of two adjacent metal sheets face opposite directions, wherein the plurality of metal sheets with openings facing a first direction are connected in parallel, and the plurality of metal sheets with openings facing a second direction are connected in parallel, wherein the first direction and the second direction are opposite.

[0011] Optionally, at least one bend of the shielding structure spans the shoulder of the corresponding metal sheet.

[0012] Optionally, at least one bend in the shielding structure spans across the corresponding main winding.

[0013] Optionally, the shielding portion of the shielding structure covers at least the shoulder and two extensions of the corresponding metal sheet in a projected area.

[0014] Optionally, the multiple bends of the shielding structure are located on a first side and a second side of the opening of the multiple metal sheets, and the multiple bends located on the first side correspond to the multiple bends located on the second side.

[0015] Optionally, the plurality of shielding portions located on the first side correspond to the plurality of shielding portions located on the second side.

[0016] To achieve the above objectives, this disclosure provides a shielding structure disposed in a transformer. The transformer includes a primary conductive unit and a secondary conductive unit, with the secondary conductive unit and the primary conductive unit being arranged alternately. The shielding structure includes at least one bent portion and two shielding portions. The two shielding portions extend from both ends of the bent portion, respectively. The at least one shielding portion of the shielding structure is disposed between at least one main winding of the primary conductive unit and the secondary conductive unit.

[0017] Optionally, the shielding structure includes a starting end and a ending end, which are electrically connected to an external component.

[0018] Alternatively, the shielding structure is a long strip structure formed by covering a conductive sheet with an insulating layer.

[0019] Optionally, the shielding structure is a long strip structure formed by connecting multiple conductive wires side by side.

[0020] Optionally, the secondary conductive unit includes at least one metal sheet having a shoulder, two extensions and an opening, the two extensions being connected to both sides of the shoulder respectively, the opening being formed between the two extensions, and the width of the shielding structure being greater than or equal to the width of the corresponding extension.

[0021] As described above, this disclosure, by placing a bent shielding structure between the primary and secondary conductive units, can form a shield between them, thereby reducing electromagnetic interference and preventing excessively high induced voltages, thus improving the stability and safety of the power supply system. Furthermore, by pre-processing and connecting the shielding structure with the metal sheet, the manufacturing process can be shortened. Attached Figure Description

[0022] Figure 1 is a schematic diagram of an embodiment of a transformer according to the present disclosure.

[0023] Figure 2 is a schematic diagram of the decomposition of Figure 1.

[0024] Figure 3 is a partial schematic diagram of the transformer in Figure 1.

[0025] Figure 4 is a cross-sectional view of Figure 1.

[0026] Figure 5 is a partial schematic diagram of the shielding structure of the transformer in Figure 1.

[0027] Figure 6 is a schematic diagram of another type of shielding structure according to an embodiment of the transformer of the present disclosure.

[0028] Figure 7 is a schematic diagram of an embodiment of a transformer according to the present disclosure.

[0029] Figure 8 is an exploded view of Figure 7.

[0030] Figure 9 is a partial schematic diagram of the transformer in Figure 7.

[0031] Figure 10 is a cross-sectional view of Figure 7.

[0032] Explanation of reference numerals in the attached figures: 2: Primary conductive unit; 21, 22, 23: Main winding; 3: Secondary conductive unit; 31, 32, 33, 34: Metal sheet; D1: First segment; D2: Second segment; 4: Iron core assembly; 41: Protrusion; 42: Accommodating space; 43: First iron core; 44: Second iron core; 5: Shielding structure; 51: Bending part; 52: Shielding part; 53: U-shaped shielding part; 54: Starting end; 55: Ending end; A: Shoulder; B: Extension; C: Opening. Detailed Implementation

[0033] To make the above and other objects, features, and advantages of this disclosure more apparent and understandable, embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. Furthermore, directional terms used in this disclosure, such as up, down, top, bottom, front, back, left, right, inside, outside, side, surrounding, center, horizontal, transverse, vertical, longitudinal, axial, radial, uppermost, or lowermost, are merely for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for the purpose of explaining and understanding this disclosure, and not for limiting this disclosure. It should be noted that the accompanying drawings are simplified schematic diagrams; therefore, only components and their combinations related to this disclosure are shown to provide a clearer description of the basic architecture or implementation method of this disclosure, while the actual components and layout may be more complex. Additionally, for ease of explanation, the components shown in the various drawings of this disclosure are not drawn to scale according to the actual number, shape, and size; the detailed scale can be adjusted according to design requirements.

[0034] Referring to FIG1, which is a schematic diagram of an embodiment of the transformer of the present disclosure, the transformer includes a primary conductive unit 2, a secondary conductive unit 3, an iron core assembly 4 and a shielding structure 5. The detailed structure, assembly relationship and operating principle of each component will be described in detail below.

[0035] As shown in Figures 1, 2, and 3, Figure 2 is an exploded view of Figure 1, and Figure 3 is a partial schematic diagram of the transformer in Figure 1. The secondary conductive unit 3 and the primary conductive unit 2 are arranged alternately. Specifically, the primary conductive unit 2 includes a main winding 21, and the secondary conductive unit 3 includes two metal plates 31 and 32. The main winding 21 of the primary conductive unit 2 is disposed between the two metal plates 31 and 32 (i.e., the secondary conductive unit 3 and the primary conductive unit 2 are arranged alternately). The core assembly 4 has a accommodating space 42 with a protrusion 41 and corresponding shapes of the main winding 21 and the two metal plates 31 and 32 to accommodate the main winding 21 and the two metal plates 31 and 32 (i.e., the main winding 21 and the secondary conductive unit 3 are disposed in the accommodating space 42). Moreover, the main winding 21 and the secondary conductive unit 3 are wound around the protrusion 41 of the core assembly 4 (i.e., the protrusion 41 of the core assembly 4 passes through the main winding 21 and the two metal plates 31 and 32).

[0036] In this embodiment, the main winding 21 is made of conductive material. According to actual needs, the conductive wire is spirally wound with a specific number of turns, and a through hole is formed in the center of the main winding 21. The two ends of the conductive wire extend outward from the periphery of the main winding 21, and the starting and ending ends of the conductive wire winding serve as terminals (not shown). In addition, the core assembly 4 is made of magnetic material, and the core assembly 4 includes a first core 43 and a second core 44. The first core 43 and the second core 44 are provided with protrusions 41, which are configured to pass through the main winding 21 and the metal sheets 31 and 32 respectively. Moreover, the first core 43 and the second core 44 cover at least a portion of the primary conductive unit 2 and the secondary conductive unit 3 to form an electromagnetic circuit, so that the primary conductive unit 2 and the secondary conductive unit 3 are electromagnetically coupled.

[0037] As shown in Figures 3 and 4, Figure 4 is a cross-sectional view of Figure 1. The shielding structure 5 includes multiple bends 51 and multiple shielding portions 52. Adjacent shielding portions 52 extend in the same direction from both ends of their respective bends 51. The shielding portions 52 of the shielding structure 5 are disposed between the main winding 21 of the primary conductive unit 2 and the secondary conductive unit 3. Specifically, adjacent shielding portions 52 of the shielding structure 5 are attached to both sides of the main winding 21, such that adjacent shielding portions 52 are located between the main winding 21 and the corresponding metal sheets 31 and 32. In addition, the shielding structure 5 also includes a starting end 54 and an ending end 55, which are respectively connected to two pins for electrical connection to an external component, such as a circuit board (not shown).

[0038] In this embodiment, as shown in FIG2, the starting end 54 and the ending end 55 of the shielding structure 5 correspond to the first segment D1 and the second segment D2 of the U-shaped metal sheet 31, respectively. The first segment D1 and the second segment D2 of the U-shaped metal sheet 31 are both shielding parts 52. The shielding structure 5 extends from the starting end 54 in the first direction (upward) through the gap between the first segment D1 of the metal sheet 31 and the main winding 21, bends at one end of the main winding 21 and then extends in the second direction (downward) through the gap between the main winding 21 and the first segment D1 of the metal sheet 32. The gap is such that at one end of the first segment D1 of the metal sheet 32, it bends and extends in the first direction; then, the shielding structure 5 winds around the second segment D2 of the metal sheet 32 ​​via the U-shaped shielding part 53 and extends in the second direction. At one end of the second segment D2 of the metal sheet 32, it bends and extends in the first direction, passing through the gap between the second segment D2 of the metal sheet 32 ​​and the main winding 21. At one end of the main winding 21, it bends and extends in the second direction, passing through the gap between the main winding 21 and the second segment D2 of the metal sheet 31. Finally, the shielding structure 5 extends to the end 55.

[0039] Figure 5 shows a partial schematic diagram of the shielding structure of the transformer in Figure 1. In this embodiment, the shielding structure 5 is a long strip structure formed by connecting multiple conductive wires side by side, and then forming a bent part 51 and a shielding part 52 by bending. However, other implementation methods are also possible. For example, the shielding structure 5 can be a long strip structure formed by covering a conductive sheet with an insulating layer. It should be noted that the shielding structure 5 of this disclosure can be pre-processed and connected with the long strip structure and the metal sheets 31 and 32 before being fitted into the iron core assembly 4, which can effectively shorten the manufacturing process.

[0040] As shown in Figure 2, in this embodiment, the two metal plates 31 and 32 are, for example, U-shaped. When the first iron core 43 and the second iron core 44 are assembled, the two ends of the metal plates 31 and 32 are exposed outside the iron core assembly 4, and the two ends of the two metal plates 31 and 32 are used for electrical connection with a circuit board or an external component (not shown). Specifically, each metal plate 31 and 32 has a shoulder A, two extensions B, and an opening C. The two extensions B are respectively connected to the two sides of the shoulder A, and the opening C is formed between the two extensions B, wherein two shielding parts 52 are respectively located on both sides of the opening C.

[0041] Figure 6 shows a schematic diagram of another embodiment of the shielding structure of the transformer of this disclosure. The shielding structure 5 of this disclosure further includes a U-shaped shielding portion 53 connected between the two shielding portions 52, and the U-shaped shielding portion 53 is away from the bending portion 51. The U-shaped shielding portion 53 can cover the shoulder A of the metal sheet 32, and the width of the U-shaped shielding portion 53 is more than half the width of the shoulder A of the metal sheet 32. The two shielding portions 52 can cover the two extensions B of the metal sheet 32, and the width of the shielding portion 52 is more than half the width of the extensions B of the metal sheet 32. This ensures that the shielding portions 52 and the U-shaped shielding portion 53 of the shielding structure 5 cover at least the two extensions B and the shoulder A of the metal sheet 32 ​​in a projected area. Preferably, the width of the shielding portions 52 and the U-shaped shielding portion 53 of the shielding structure 5 is greater than or equal to the width of the extensions B and the shoulder A of the metal sheet 32, thereby increasing the area of ​​the metal sheet 32 ​​that is shielded and improving the shielding effect of the shielding structure 5.

[0042] In addition, the two bends 51 of the shielding structure are located on a first side and a second side of the opening C of the corresponding metal sheet 32, respectively, and the bend 51 on the first side corresponds to the bend 51 on the second side.

[0043] Referring to Figures 7 and 8, Figure 7 is a schematic diagram of another embodiment of the transformer of the present disclosure, and Figure 8 is an exploded schematic diagram of Figure 7. The secondary conductive unit 3 of the present disclosure includes a plurality of metal sheets 31, 32, 33, and 34, and the plurality of main windings 21, 22, and 23 of the primary conductive unit 2 of the present disclosure are disposed between the plurality of metal sheets 31, 32, 33, and 34.

[0044] As shown in Figures 8, 9, and 10, Figure 9 is a partial schematic diagram of the transformer in Figure 7, and Figure 10 is a cross-sectional view of Figure 7. The shielding structure 5 of this disclosure has multiple shielding portions 52 respectively disposed between the corresponding main windings 21, 22, 23 and the corresponding metal plates 31, 32, 33, 34. The multiple bent portions 51 of the shielding structure 5 span across the corresponding main windings 21, 22, 23 and across the shoulders A of the corresponding metal plates 32, 34. The multiple metal plates 31, 32, 33, 34 are arranged alternately, such that the openings C of adjacent metal plates 31, 32, 33, 34 face opposite directions. The metal plates 32, 34 with openings C facing upwards are connected in parallel, and the metal plates 31, 33 with openings C facing downwards are connected in parallel.

[0045] In this embodiment, as shown in FIG8, the starting end 54 and the ending end 55 of the shielding structure 5 correspond to the first segment D1 and the second segment D2 of the U-shaped metal sheet 31, respectively. Both the first segment D1 and the second segment D2 of the U-shaped metal sheet 31 are shielding parts 52. The shielding structure 5 extends from the starting end 54 in a first direction (upward) through the gap between the first segment D1 of the metal sheet 31 and the main winding 21, bends at one end of the main winding 21, and then extends in a second direction (downward) through the gap between the main winding 21 and the first segment D1 of the metal sheet 32. It then bends at one end of the first segment D1 of the metal sheet 32 ​​towards the second direction (downward). Extending in one direction, the shielding structure 5 is wound in the same way as the main winding 21 in the main windings 22 and 23, which will not be described again here; then, the shielding structure 5 is wound through the U-shaped shielding part 53 to the second segment D2 of the metal sheet 34 and extends in the second direction. At one end of the second segment D2 of the metal sheet 34, it is bent and extends in the first direction, passing through the gap between the second segment D2 of the metal sheet 34 and the main winding 23. At one end of the main winding 23, it is bent and extends in the second direction, passing through the gap between the main winding 23 and the second segment D2 of the metal sheet 33. The subsequent winding method is the same. Finally, the shielding structure 5 extends to the end 55.

[0046] Based on the above structure, the shielding structure 5 located between the primary conductive unit 2 and the secondary conductive unit 3 can form a shield between the main windings 21, 22, 23 and the metal sheets 31, 32, 33, 34 in the transformer, thereby reducing electromagnetic interference. For example, in a transformer without the shielding structure 5, its EMI is only -0.46dB, while in a transformer with the shielding structure 5, its EMI drops to -3.18dB. Therefore, the shielding structure 5 of this disclosure can effectively reduce the impact of EMI.

[0047] As described above, this disclosure, by bending the shielding structure 5 between the primary conductive unit 2 and the secondary conductive unit 3, can form a shield between the primary conductive unit 2 and the secondary conductive unit 3, thereby reducing electromagnetic interference and preventing the generation of excessively high induced voltage, thus improving the stability and safety of the power supply system. Furthermore, by pre-processing and connecting the shielding structure 5 with the metal sheets 31 and 32, the manufacturing process can be shortened.

[0048] Although this disclosure has been disclosed by way of example, it is not intended to limit this disclosure. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of this disclosure. Therefore, the scope of protection of this disclosure shall be determined by the appended claims.

Claims

1. A transformer, wherein, Include: A primary conductive unit includes at least one main winding; The secondary conductive unit is arranged alternately with the primary conductive unit; A core assembly having a protrusion and a receiving space, wherein the main winding and the secondary conductive unit are disposed in the receiving space and wound around the protrusion; and A shielding structure includes multiple bends and multiple shielding portions, with two adjacent shielding portions extending from the two ends of the corresponding bends, wherein at least one shielding portion of the shielding structure is disposed between at least one main winding of the primary conductive unit and the secondary conductive unit.

2. The transformer according to claim 1, wherein, The secondary conductive unit includes two metal plates, at least one main winding of the primary conductive unit is disposed between the two metal plates, and at least one shielding part of the shielding structure is disposed between the corresponding main winding and the corresponding metal plate.

3. The transformer according to claim 1, wherein, The secondary conductive unit includes multiple metal sheets, and the multiple main windings of the primary conductive unit are disposed between the multiple metal sheets. The multiple shielding parts of the shielding structure are respectively disposed between the corresponding main windings and the corresponding metal sheets.

4. The transformer according to claim 3, wherein, Each metal sheet has a shoulder, two extensions and an opening. The two extensions are respectively connected to the two sides of the shoulder, the opening is formed between the two extensions, and the two shielding parts are respectively located on both sides of the opening.

5. The transformer according to claim 4, wherein, Multiple metal sheets are arranged in an alternating manner, such that the openings of two adjacent metal sheets face opposite directions. Multiple metal sheets with openings facing a first direction are connected in parallel, and multiple metal sheets with openings facing a second direction are connected in parallel, with the first direction and the second direction facing opposite directions.

6. The transformer according to claim 4, wherein, At least one bend in the shielding structure spans the shoulder of the corresponding metal sheet.

7. The transformer according to claim 4, wherein, At least one bend in the shielding structure is positioned across the corresponding main winding.

8. The transformer according to claim 4, wherein, The shielding portion of the shielding structure covers at least two extensions of the corresponding metal sheet within a projected area.

9. The transformer according to claim 4, wherein, The multiple bends of the shielding structure are located on a first side and a second side of the openings of the multiple metal sheets, and the multiple bends located on the first side correspond to the multiple bends located on the second side.

10. The transformer according to claim 9, wherein, The plurality of shielding portions located on the first side correspond to the plurality of shielding portions located on the second side.

11. A shielding structure, wherein, The shielding structure is installed in a transformer, which includes a primary conductive unit and a secondary conductive unit, wherein the secondary conductive units are alternately arranged with the primary conductive units. Multiple bends; and Multiple shielding sections, with two adjacent shielding sections extending from the two ends of the corresponding bends; At least one shielding part of the shielding structure is disposed between at least one main winding of the primary conductive unit and the secondary conductive unit.

12. The shielding structure according to claim 11, wherein, The shielding structure includes a starting end and a ending end, which are electrically connected to an external component.

13. The shielding structure according to claim 11, wherein, The shielding structure is a long strip-shaped structure formed by covering a conductive sheet with an insulating layer.

14. The shielding structure according to claim 11, wherein, The shielding structure is a long strip structure formed by connecting multiple conductive wires side by side.

15. The shielding structure according to claim 11, wherein, The secondary conductive unit includes at least one metal sheet having a shoulder, two extensions and an opening. The two extensions are respectively connected to the two sides of the shoulder, and the opening is formed between the two extensions. The width of the shielding structure is greater than or equal to the width of the corresponding extension.

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