Copper foil winding and method for reducing AC loss of single-ended flyback transformer

Abstract

The present invention belongs to the technical field of high-frequency transformers of switching power supplies, and in particular to a copper foil winding for reducing the AC loss of a single-ended flyback transformer, comprising a winding skeleton, wherein the winding skeleton comprises winding columns at two ends and limiting disks located at two ends of the winding columns, wherein the limiting disks are provided with a plurality of pins on the outside, and a foil-shaped conductor winding is wound on the winding columns; the winding skeleton comprises two groups of symmetrically arranged "E"-shaped components, and the middle column at the middle position of the "E"-shaped components is shorter than the side columns at two ends; the copper foil winding of the single-ended flyback transformer of the present invention, the structure of the winding skeleton and the foil-shaped conductor winding adopt segmented winding, which greatly reduces the AC loss of the copper foil winding and expands the application range of the copper foil winding, and the tail wire of the copper foil winding is wound on the positioning column, which reduces the difficulty of the copper foil winding winding process and reduces the winding cost, and the position of the positioning column can be adjusted according to the position of the foil-shaped conductor winding, which is more convenient to use.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-frequency transformers of switching power supplies, and specifically relates to a copper foil winding for reducing AC loss of a single-ended flyback transformer, and also relates to a method for reducing AC loss of the copper foil winding of a single-ended flyback transformer. Background Art

[0002] Switching power supply products are widely used in the fields of communications, industrial automation, aviation, instrumentation, etc. The single-ended flyback converter has many advantages such as simple circuit and efficient DC output. It is particularly suitable for designing low-power switching power supplies and has been widely used. Since the transformer is the largest, most expensive and least efficient basic component in the single-ended flyback converter, it has unique improvement potential. High frequency and miniaturization are the development direction of transformers. One way to reduce the size of the transformer is to reduce high-frequency losses.

[0003] There are two main types of losses in high-frequency transformers: core loss and winding loss. Winding loss is further divided into DC loss and AC loss. The latter is the high-frequency loss caused by the combined action of skin effect and proximity effect. In applications where ripple current is relatively large, we generally choose ferrite cores with air gaps, so we must deal with the problem of edge flux at the air gap, otherwise it will cause very high copper loss. When the current is relatively large, copper foil winding is a good choice because the filling rate of Litz wire or multi-strand wire is relatively low. Each turn of the copper foil winding is a layer. As the number of layers increases, the AC loss of the winding increases sharply. Therefore, effectively reducing the AC loss of the copper foil winding of the single-ended flyback transformer is a major problem that needs to be solved urgently. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a copper foil winding and method for reducing the AC loss of a single-ended flyback transformer, which has the characteristics of simple process, high equipment utilization and low AC loss.

[0005] To achieve the above-mentioned purpose, the present invention provides a technical solution: a copper foil winding for reducing the AC loss of a single-ended flyback transformer, comprising a winding skeleton, the winding skeleton comprising winding columns at two ends and limiting disks located at two ends of the winding columns, the limiting disk having a plurality of pins on the outside, a foil-shaped conductor winding wound on the winding column, and the foil-shaped conductor winding is wound in sections, and the number of sections is at least two; retaining walls are respectively arranged between the two ends of the foil-shaped conductor winding and the skeleton, an insulating layer is arranged between the layers of the foil-shaped conductor winding, and primary and secondary winding insulation is arranged between the primary winding and the secondary winding of the foil-shaped conductor winding; the winding skeleton comprises two groups of symmetrically arranged "E"-shaped components, and the middle column in the middle position of the "E"-shaped component is shorter than the side columns at the two ends; the retaining wall is 3M tape, and the width of the retaining wall is at least 3mm;

[0006] It also includes a positioning column, which is installed on the inner sides of the two limit plates; it also includes an elastic positioning component, and the elastic positioning component includes a positioning spring block and a reset spring, positioning grooves are respectively provided at both ends of the positioning column, and a mounting groove is provided on the opposite surface of the limit plate, one end of the positioning spring block can be reciprocated and embedded in the mounting groove, and the other end extends out of the mounting groove and is embedded in the positioning groove, and the reset spring is distributed between the embedded end surface of the positioning spring block and the cavity end wall of the mounting groove;

[0007] The installation grooves are arranged in a ring shape with equal intervals and are numbered 5 to 7; the protruding end of the positioning spring block is an inclined surface; a No. 1 limiting ring is fixed on the embedded end of the positioning spring block, and a No. 2 limiting ring corresponding to the No. 1 limiting ring is fixed on the inner wall of the port of the installation groove.

[0008] As a preferred technical solution of the present invention, the layers of the foil-shaped conductor winding are insulated with Nomex insulating paper with a thickness of 0.1 mm.

[0009] As a preferred technical solution of the present invention, the primary and secondary windings are insulated by three layers of Nomex insulation paper with a thickness of 0.1 mm.

[0010] The present invention is based on a copper foil winding for reducing the AC loss of a single-ended flyback transformer, and also provides a method for reducing the AC loss of a single-ended flyback transformer, comprising the following steps:

[0011] Step 1: Select the switching power transformer and determine the installation and connection method of the copper foil winding, and then determine the number of layers of the copper foil winding of the switching power transformer;

[0012] Step 2: Paste retaining tape on the inner wall of the winding frame;

[0013] Step 3: Winding the foil-shaped conductor winding on the winding pole in sections, and filling Nomex insulating paper between the layers of the foil-shaped conductor winding;

[0014] Step 4: Fill the primary and secondary winding insulation between the primary winding and the secondary winding of the foil-shaped conductor winding;

[0015] Step 5: Wrap the tail wire of the foil conductor winding around the positioning column, install the positioning column inside the two limit plates, and fix it using an elastic positioning component.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the copper foil winding of the single-ended flyback transformer of the present invention, the structure of the winding skeleton and the segmented winding of the foil-shaped conductor winding greatly reduce the AC loss of the copper foil winding and expand the application scope of the copper foil winding. In addition, the tail wire of the copper foil winding is wound on the positioning column, which reduces the difficulty of the copper foil winding winding process and reduces the winding cost. At the same time, the position of the positioning column can be adjusted according to the position of the foil-shaped conductor winding, which is more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a structural schematic diagram of an E-type foil winding without segmentation of the present invention;

[0019] Figure 2 It is a schematic structural diagram of an E-type segmented foil winding in the present invention;

[0020] Figure 3 This is the magnetic field line distribution diagram of the E-type in the present invention without segmented foil winding window;

[0021] Figure 4 This is a magnetic field line distribution diagram of the E-type segmented foil winding window in the present invention;

[0022] Figure 5 This is an asymmetric air gap distribution diagram of an E-type magnetic core without segmentation in the present invention;

[0023] Figure 6 The E-type magnetic core in the present invention has a segmented symmetrical air gap distribution diagram;

[0024] Figure 7 It is a schematic diagram of the front structure of the winding skeleton in the present invention;

[0025] Figure 8 It is a schematic diagram of the front structure of the limiting plate in the present invention;

[0026] Fig. 9It is a schematic diagram of the side cross-sectional structure of the limiting plate in the present invention;

[0027] In the figure: 1. foil conductor winding; 2. primary and secondary winding insulation; 3. retaining wall; 4. limit plate; 5. winding column; 6. pin; 7. positioning column; 8. mounting groove; 9. positioning spring block; 10. positioning groove; 11. reset spring; 12. limit ring No. 1; 13. limit ring No. 2. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Embodiment 1

[0030] See also Figure 1-9 The present invention provides the following technical solutions: a copper foil winding for reducing the AC loss of a single-ended flyback transformer, comprising a winding skeleton, the winding skeleton comprising winding columns 5 at two ends and limit plates 4 located at two ends of the winding column 5, the limit plate 4 having a plurality of pins 6 on the outside, a foil-shaped conductor winding 1 wound on the winding column 5, and the foil-shaped conductor winding 1 is wound in sections, and the number of sections is at least two sections. This embodiment takes two sections as an example. In actual use, the greater the AC loss, the greater the number of sections; retaining walls 3 are respectively provided between the two ends of the foil-shaped conductor winding 1 and the skeleton, an insulating layer is provided between the layers of the foil-shaped conductor winding 1, and a primary and secondary winding insulation 2 is provided between the primary winding and the secondary winding of the foil-shaped conductor winding 1; the winding skeleton comprises two groups of symmetrically arranged "E"-shaped components, and the middle column in the middle position of the "E"-shaped component is shorter than the side columns at the two ends.

[0031] Specifically, according to the attached Figure 1 and attached Figure 2 As shown, in this embodiment, the retaining wall 3 is 3M tape, and the width of the retaining wall 3 is at least 3 mm, meeting the safety specifications of the primary winding and the secondary winding.

[0032] Specifically, according to the attached Figure 1 and attached Figure 2 As shown, in this embodiment, the layers of the foil-shaped conductor winding 1 are insulated with Nomex insulating paper with a thickness of 0.1 mm to improve the insulation performance.

[0033] Specifically, according to the attached Figure 1 and attached Figure 2 As shown, in this embodiment, the primary and secondary winding insulation 2 is 3 layers of Nomex insulation paper with a thickness of 0.1 mm to improve the insulation performance.

[0034] Specifically, according to the attached Figure 7 , Attachment Figure 8 and attached Fig. 9 As shown, in this embodiment, it also includes a positioning column 7, which is installed on the inner sides of the two limit disks 4; it also includes an elastic positioning component, and the elastic positioning component includes a positioning spring block 9 and a reset spring 11. Positioning grooves 10 are respectively provided at both ends of the positioning column 7, and a mounting groove 8 is provided on the opposite side of the limit disk 4. One end of the positioning spring block 9 can be reciprocated and embedded in the mounting groove 8, and the other end extends out of the mounting groove 8 and is embedded in the positioning groove 10. The reset spring 11 is distributed between the embedded end face of the positioning spring block 9 and the cavity end wall of the mounting groove 8. When in use, the tail wire of the foil-shaped conductor winding 1 is wound on the positioning column 7, and the positioning column 7 is installed on the inner sides of the two limit disks 4. The positioning spring block 9 is embedded in the positioning groove 10 of the positioning column 7. The reset spring 11 is used to ensure the stability of the connection between the positioning column 7 and the limit disk 4, ensure the stability of the winding of the foil-shaped conductor winding 1, reduce the process difficulty, and avoid the problem of easy damage to the winding skeleton and the interlayer insulation layer during later cutting.

[0035] Specifically, according to the attached Fig. 9 As shown, in the present embodiment, five mounting grooves 8 are provided in a ring shape with equal intervals; the protruding end of the positioning spring block 9 is an inclined surface, which is beneficial to the installation of the positioning column 7 and saves more effort; a No. 1 limiting ring 12 is fixed to the embedded end of the positioning spring block 9, and a No. 2 limiting ring 13 corresponding to the No. 1 limiting ring 12 is fixed to the inner wall of the port of the mounting groove 8. The setting of the No. 1 limiting ring 12 and the No. 2 limiting ring 13 limits the range of movement of the positioning spring block 9, making the movement of the positioning spring block 9 safer and more stable, thereby ensuring the stability of the connection between the positioning column 7 and the limiting plate 4.

[0036] A method for reducing AC loss of a single-ended flyback transformer comprises the following steps:

[0037] Step 1: Select the switching power transformer and determine the installation and connection method of the copper foil winding, and then determine the number of layers of the copper foil winding of the switching power transformer;

[0038] Step 2: Paste the retaining wall 3 tape on the inner wall of the winding frame;

[0039] Step 3: Winding the foil-shaped conductor winding 1 on the winding column 5 in sections, and filling Nomex insulating paper between the layers of the foil-shaped conductor winding 1;

[0040] Step 4: Filling the primary and secondary winding insulation 2 between the primary winding and the secondary winding of the foil-shaped conductor winding 1;

[0041] Step 5: Wrap the tail wire of the foil-shaped conductor winding 1 around the positioning column 7, and install the positioning column 7 inside the two limiting plates 4 and fix it using an elastic positioning component.

[0042] In one embodiment of the present invention, as shown in the attached Figure 3 and attached Figure 4 As shown, the distance X from the core cross section at the air gap to the end face of the foil winding satisfies X=2δ-3δ, where δ is the air gap on the core center column, which reduces the eddy current loss at the air gap and improves the efficiency of the converter.

[0043] In one embodiment of the present invention, as shown in the attached Figure 5 and attached Figure 6 As shown, a portion of the core length g is cut off from the core center column, and the core length g satisfies g=δ / 2, where δ is the air gap on the core center column, so as to fully utilize the copper foil.

[0044] Embodiment 2

[0045] See also Figure 1-9 The present invention provides the following technical solutions: a copper foil winding for reducing the AC loss of a single-ended flyback transformer, comprising a winding skeleton, the winding skeleton comprising winding columns 5 at two ends and limit plates 4 located at two ends of the winding column 5, the limit plate 4 having a plurality of pins 6 on the outside, a foil-shaped conductor winding 1 wound on the winding column 5, and the foil-shaped conductor winding 1 is wound in sections, and the number of sections is at least two sections. This embodiment takes two sections as an example. In actual use, the greater the AC loss, the greater the number of sections; retaining walls 3 are respectively provided between the two ends of the foil-shaped conductor winding 1 and the skeleton, an insulating layer is provided between the layers of the foil-shaped conductor winding 1, and a primary and secondary winding insulation 2 is provided between the primary winding and the secondary winding of the foil-shaped conductor winding 1; the winding skeleton comprises two groups of symmetrically arranged "E"-shaped components, and the middle column in the middle position of the "E"-shaped component is shorter than the side columns at the two ends.

[0046] Specifically, according to the attached Figure 1 and attached Figure 2 As shown, in this embodiment, the retaining wall 3 is 3M tape, and the width of the retaining wall 3 is at least 3 mm, meeting the safety specifications of the primary winding and the secondary winding.

[0047] Specifically, according to the attached Figure 1 and attached Figure 2 As shown, in this embodiment, the layers of the foil-shaped conductor winding 1 are insulated with Nomex insulating paper with a thickness of 0.1 mm to improve the insulation performance.

[0048] Specifically, according to the attached Figure 1 and attached Figure 2 As shown, in this embodiment, the primary and secondary winding insulation 2 is 3 layers of Nomex insulation paper with a thickness of 0.1 mm to improve the insulation performance.

[0049] Specifically, according to the attached Figure 7 , Attachment Figure 8 and attached Fig. 9As shown, in this embodiment, it also includes a positioning column 7, which is installed on the inner sides of the two limit disks 4; it also includes an elastic positioning component, and the elastic positioning component includes a positioning spring block 9 and a reset spring 11. Positioning grooves 10 are respectively provided at both ends of the positioning column 7, and a mounting groove 8 is provided on the opposite side of the limit disk 4. One end of the positioning spring block 9 can be reciprocated and embedded in the mounting groove 8, and the other end extends out of the mounting groove 8 and is embedded in the positioning groove 10. The reset spring 11 is distributed between the embedded end face of the positioning spring block 9 and the cavity end wall of the mounting groove 8. When in use, the tail wire of the foil-shaped conductor winding 1 is wound on the positioning column 7, and the positioning column 7 is installed on the inner sides of the two limit disks 4. The positioning spring block 9 is embedded in the positioning groove 10 of the positioning column 7. The reset spring 11 is used to ensure the stability of the connection between the positioning column 7 and the limit disk 4, ensure the stability of the winding of the foil-shaped conductor winding 1, reduce the process difficulty, and avoid the problem of easy damage to the winding skeleton and the interlayer insulation layer during later cutting.

[0050] Specifically, according to the attached Fig. 9 As shown, in the present embodiment, six mounting grooves 8 are provided in a ring shape with equal intervals; the protruding end of the positioning spring block 9 is an inclined surface, which is beneficial to the installation of the positioning column 7 and saves more effort; a No. 1 limiting ring 12 is fixed to the embedded end of the positioning spring block 9, and a No. 2 limiting ring 13 corresponding to the No. 1 limiting ring 12 is fixed to the inner wall of the port of the mounting groove 8. The setting of the No. 1 limiting ring 12 and the No. 2 limiting ring 13 limits the range of movement of the positioning spring block 9, making the movement of the positioning spring block 9 safer and more stable, thereby ensuring the stability of the connection between the positioning column 7 and the limiting plate 4.

[0051] A method for reducing AC loss of a single-ended flyback transformer comprises the following steps:

[0052] Step 1: Select the switching power transformer and determine the installation and connection method of the copper foil winding, and then determine the number of layers of the copper foil winding of the switching power transformer;

[0053] Step 2: Paste the retaining wall 3 tape on the inner wall of the winding frame;

[0054] Step 3: Winding the foil-shaped conductor winding 1 on the winding column 5 in sections, and filling Nomex insulating paper between the layers of the foil-shaped conductor winding 1;

[0055] Step 4: Filling the primary and secondary winding insulation 2 between the primary winding and the secondary winding of the foil-shaped conductor winding 1;

[0056] Step 5: Wrap the tail wire of the foil-shaped conductor winding 1 around the positioning column 7, and install the positioning column 7 inside the two limiting plates 4 and fix it using an elastic positioning component.

[0057] In one embodiment of the present invention, as shown in the attached Figure 3 and attached Figure 4As shown, the distance X from the core cross section at the air gap to the end face of the foil winding satisfies X=2δ-3δ, where δ is the air gap on the core center column, which reduces the eddy current loss at the air gap and improves the efficiency of the converter.

[0058] In one embodiment of the present invention, as shown in the attached Figure 5 and attached Figure 6 As shown, a portion of the core length g is cut off from the core center column, and the core length g satisfies g=δ / 2, where δ is the air gap on the core center column, so as to fully utilize the copper foil.

[0059] Embodiment 3

[0060] See also Figure 1-9 The present invention provides the following technical solutions: a copper foil winding for reducing the AC loss of a single-ended flyback transformer, comprising a winding skeleton, the winding skeleton comprising winding columns 5 at two ends and limit plates 4 located at two ends of the winding column 5, the limit plate 4 having a plurality of pins 6 on the outside, a foil-shaped conductor winding 1 wound on the winding column 5, and the foil-shaped conductor winding 1 is wound in sections, and the number of sections is at least two sections. This embodiment takes two sections as an example. In actual use, the greater the AC loss, the greater the number of sections; retaining walls 3 are respectively provided between the two ends of the foil-shaped conductor winding 1 and the skeleton, an insulating layer is provided between the layers of the foil-shaped conductor winding 1, and a primary and secondary winding insulation 2 is provided between the primary winding and the secondary winding of the foil-shaped conductor winding 1; the winding skeleton comprises two groups of symmetrically arranged "E"-shaped components, and the middle column in the middle position of the "E"-shaped component is shorter than the side columns at the two ends.

[0061] Specifically, according to the attached Figure 1 and attached Figure 2 As shown, in this embodiment, the retaining wall 3 is 3M tape, and the width of the retaining wall 3 is at least 3 mm, meeting the safety specifications of the primary winding and the secondary winding.

[0062] Specifically, according to the attached Figure 1 and attached Figure 2 As shown, in this embodiment, the layers of the foil-shaped conductor winding 1 are insulated with Nomex insulating paper with a thickness of 0.1 mm to improve the insulation performance.

[0063] Specifically, according to the attached Figure 1 and attached Figure 2 As shown, in this embodiment, the primary and secondary winding insulation 2 is 3 layers of Nomex insulation paper with a thickness of 0.1 mm to improve the insulation performance.

[0064] Specifically, according to the attached Figure 7 , Attachment Figure 8 and attached Fig. 9As shown, in this embodiment, it also includes a positioning column 7, which is installed on the inner sides of the two limit disks 4; it also includes an elastic positioning component, and the elastic positioning component includes a positioning spring block 9 and a reset spring 11. Positioning grooves 10 are respectively provided at both ends of the positioning column 7, and a mounting groove 8 is provided on the opposite side of the limit disk 4. One end of the positioning spring block 9 can be reciprocated and embedded in the mounting groove 8, and the other end extends out of the mounting groove 8 and is embedded in the positioning groove 10. The reset spring 11 is distributed between the embedded end face of the positioning spring block 9 and the cavity end wall of the mounting groove 8. When in use, the tail wire of the foil-shaped conductor winding 1 is wound on the positioning column 7, and the positioning column 7 is installed on the inner sides of the two limit disks 4. The positioning spring block 9 is embedded in the positioning groove 10 of the positioning column 7. The reset spring 11 is used to ensure the stability of the connection between the positioning column 7 and the limit disk 4, ensure the stability of the winding of the foil-shaped conductor winding 1, reduce the process difficulty, and avoid the problem of easy damage to the winding skeleton and the interlayer insulation layer during later cutting.

[0065] Specifically, according to the attached Fig. 9 As shown, in the present embodiment, 7 mounting grooves 8 are provided in a ring shape with equal intervals; the protruding end of the positioning spring block 9 is an inclined surface, which is beneficial to the installation of the positioning column 7 and saves more effort; a No. 1 limiting ring 12 is fixed on the embedded end of the positioning spring block 9, and a No. 2 limiting ring 13 corresponding to the No. 1 limiting ring 12 is fixed on the inner wall of the port of the mounting groove 8. The setting of the No. 1 limiting ring 12 and the No. 2 limiting ring 13 limits the range of movement of the positioning spring block 9, making the movement of the positioning spring block 9 safer and more stable, thereby ensuring the stability of the connection between the positioning column 7 and the limiting plate 4.

[0066] A method for reducing AC loss of a single-ended flyback transformer comprises the following steps:

[0067] Step 1: Select the switching power transformer and determine the installation and connection method of the copper foil winding, and then determine the number of layers of the copper foil winding of the switching power transformer;

[0068] Step 2: Paste the retaining wall 3 tape on the inner wall of the winding frame;

[0069] Step 3: Winding the foil-shaped conductor winding 1 on the winding column 5 in sections, and filling Nomex insulating paper between the layers of the foil-shaped conductor winding 1;

[0070] Step 4: Filling the primary and secondary winding insulation 2 between the primary winding and the secondary winding of the foil-shaped conductor winding 1;

[0071] Step 5: Wrap the tail wire of the foil-shaped conductor winding 1 around the positioning column 7, and install the positioning column 7 inside the two limiting plates 4 and fix it using an elastic positioning component.

[0072] In one embodiment of the present invention, as shown in the attached Figure 3 and attached Figure 4As shown, the distance X from the core cross section at the air gap to the end face of the foil winding satisfies X=2δ-3δ, where δ is the air gap on the core center column, which reduces the eddy current loss at the air gap and improves the efficiency of the converter.

[0073] In one embodiment of the present invention, as shown in the attached Figure 5 and attached Figure 6 As shown, a portion of the core length g is cut off from the core center column, and the core length g satisfies g=δ / 2, where δ is the air gap on the core center column, so as to fully utilize the copper foil.

[0074] Finally, it should be noted that the above description 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 replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A copper foil winding for reducing the AC loss of a single-ended flyback transformer, comprising a winding skeleton, the winding skeleton comprising winding columns (5) at two ends and limiting plates (4) located at two ends of the winding columns (5), the limiting plates (4) having a plurality of pins (6) on the outside, characterized in that: A foil-shaped conductor winding (1) is wound on the winding column (5), and the foil-shaped conductor winding (1) is wound in sections, and the number of sections is at least two; retaining walls (3) are respectively provided between the two ends of the foil-shaped conductor winding (1) and the frame, an insulating layer is provided between the layers of the foil-shaped conductor winding (1), and primary and secondary winding insulation (2) is provided between the primary winding and the secondary winding of the foil-shaped conductor winding (1); the winding frame comprises two groups of symmetrically arranged "E"-shaped components, and the middle column in the middle position of the "E"-shaped components is shorter than the side columns at the two ends; the retaining wall (3) is 3M tape, and the width of the retaining wall (3) is at least 3 mm; It also includes a positioning column (7), which is installed on the inner side of the two limit plates (4); it also includes an elastic positioning component, and the elastic positioning component includes a positioning spring block (9) and a reset spring (11), and positioning grooves (10) are respectively provided at both ends of the positioning column (7), and a mounting groove (8) is provided on the opposite surface of the limit plate (4), one end of the positioning spring block (9) can be reciprocated and embedded in the mounting groove (8), and the other end extends out of the mounting groove (8) and is embedded in the positioning groove (10), and the reset spring (11) is distributed between the embedded end surface of the positioning spring block (9) and the cavity end wall of the mounting groove (8); The installation grooves (8) are provided with 5 to 7 ring-shaped grooves at equal intervals; the protruding end of the positioning spring block (9) is an inclined surface; a first limiting ring (12) is fixed on the embedded end of the positioning spring block (9), and a second limiting ring (13) corresponding to the first limiting ring (12) is fixed on the inner wall of the port of the installation groove (8).

2. The copper foil winding for reducing AC loss of a single-ended flyback transformer according to claim 1, characterized in that: The layers of the foil-shaped conductor winding (1) are insulated with Nomex insulating paper with a thickness of 0.1 mm.

3. The copper foil winding for reducing AC loss of a single-ended flyback transformer according to claim 1, characterized in that: The primary and secondary winding insulation (2) is 3 layers of Nomex insulation paper with a thickness of 0.1 mm.

4. According to the copper foil winding for reducing the AC loss of a single-ended flyback transformer according to any one of claims 1 to 3, a method for reducing the AC loss of a single-ended flyback transformer is provided, characterized in that: The steps include: Step 1: Select the switching power transformer and determine the installation and connection method of the copper foil winding, and then determine the number of layers of the copper foil winding of the switching power transformer; Step 2: Paste the retaining wall (3) tape on the inner side wall of the winding frame; Step 3: Winding the foil-shaped conductor winding (1) in sections on the winding column (5), and filling Nomex insulating paper between the layers of the foil-shaped conductor winding (1); Step 4: Filling the primary and secondary winding insulation (2) between the primary winding and the secondary winding of the foil-shaped conductor winding (1); Step 5: Wrap the tail wire of the foil-shaped conductor winding (1) around the positioning column (7), and install the positioning column (7) inside the two limit plates (4) and fix it using an elastic positioning component.

Images