Copper sheet winding and transformer

Abstract

The application discloses a copper sheet winding and a transformer. The copper sheet winding comprises a ring-shaped copper sheet body, the ring-shaped copper sheet body is provided with a circular inner ring through hole, and a discontinuous opening penetrating through the circular inner ring through hole is arranged on the ring-shaped copper sheet body. A separation groove and a cutting opening are formed on the ring-shaped copper sheet body by stamping and cutting. The separation groove is arranged in an extension direction of the ring-shaped copper sheet body, the separation groove penetrates through two end surfaces of the ring-shaped copper sheet body in a hole depth direction of the circular inner ring through hole, and the separation groove separates the ring-shaped copper sheet body into an inner ring body and an outer ring body. The cutting opening penetrates through the two end surfaces of the ring-shaped copper sheet body in the hole depth direction of the circular inner ring through hole, and the cutting opening is located on an inner ring side of the separation groove and penetrates through the circular inner ring through hole in a radial direction. In this way, the eddy current loss generated after the copper sheet winding is powered on is reduced, the thermal energy loss and the magnetic field loss at the air gap position are effectively improved, the transformer can continuously and stably operate at a suitable temperature, the overall power is improved, and the loss is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of transformer technology, in particular to a copper sheet winding and a transformer, which mainly but not limited to an AI server transformer product. BACKGROUND

[0002] The existing film-coated copper sheet winding is a middle column round hole, and the copper sheet winding is an integral copper sheet. After the transformer is powered on, the current flows into the copper sheet winding to form the copper sheet itself eddy current loss.

[0003] For example, CN 207441438 U discloses a copper sheet winding structure and a transformer. The copper sheet winding structure comprises a first copper sheet having a first body, a first extension part and a second extension part located at both ends of the first body, respectively; and a second copper sheet having a second body, a third extension part and a fourth extension part located at both ends of the second body, respectively, the third extension part and the fourth extension part are arranged in an intersecting manner, so that the second body is partially overlapped, after the first copper sheet and the second copper sheet are stacked, the second extension part is located on the third extension part, and the first extension part and the fourth extension part are located on the same side of the second extension part and the third extension part. The first copper sheet and the second copper sheet of the whole piece type will generate a larger eddy current loss (also known as copper loss) on the first copper sheet and the second copper sheet after the copper sheet winding is turned on. Moreover, the first body and the second body are annular to be sleeved on the core columns of the first magnetic core part and the second magnetic core part. The core column joint has magnetic field eddy current loss and thermal energy loss, which is not conducive to the stable operation of the transformer at a suitable temperature.

[0004] Therefore, it is necessary to study a new technical solution to solve the above problems. SUMMARY

[0005] In view of the above, the present application aims to solve the problems existing in the prior art. The main purpose is to provide a copper sheet winding and a transformer, which reduces the eddy current loss generated after the copper sheet winding is powered on, effectively improves the thermal energy loss and magnetic field loss at the air gap position, ensures the stable operation of the transformer at a suitable temperature, and improves the overall power and reduces the loss.

[0006] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0007] A copper sheet winding comprises an annular copper sheet body, the annular copper sheet body has a circular inner ring through hole, the annular copper sheet body is provided with a discontinuous opening penetrating the circular inner ring through hole, the annular copper sheet body is divided into two end parts by the discontinuous opening, and the two end parts each extend outward from the outer ring side of the annular copper sheet body to an external part with a lead-out pin;

[0008] The annular copper sheet body is formed with a separation groove and a cutting opening by stamping and cutting.

[0009] The separation groove is arranged along the circumferential direction of the annular copper sheet body, and penetrates the two end surfaces of the annular copper sheet body along the hole depth direction of the circular inner ring through hole. The separation groove separates the annular copper sheet body to form an inner ring body and an outer ring body located on the inner side and the outer side of the separation groove respectively. The two ends of the inner ring body and the outer ring body are connected to the corresponding two end portions respectively.

[0010] The cutting port penetrates the two end surfaces of the annular copper sheet body along the hole depth direction of the circular inner ring through hole, and is located on the inner ring side of the separation groove and penetrates the circular inner ring through hole in the radial direction.

[0011] As a preferred solution, the cutting port is spaced apart from the disconnection port, so that the cutting port and the disconnection port are separated by the circular arc edge on the inner ring side of the annular copper sheet body.

[0012] As a preferred solution, the cutting port is provided with two, and the disconnection port is arranged eccentrically relative to a center line of the annular copper sheet body, and the two cutting ports are located on the two sides of the center line respectively.

[0013] As a preferred solution, the outer ring side of the annular copper sheet body is provided with a jig positioning cut edge, the jig positioning cut edge is located on the opposite side of the lead-out foot, and the jig positioning cut edge and the lead-out foot are located on the two sides of the connecting line of the two cutting ports respectively.

[0014] As a preferred solution, the separation groove extends from one end of the annular copper sheet body to the other end, so as to separate the area of the separation groove except the two end portions to form the inner ring body and the inner ring body.

[0015] As a preferred solution, the ring width ratio of the inner ring body and the inner ring body is 0.7 to 1.5.

[0016] As a preferred solution, the groove width of the separation groove accounts for one-twentieth to one-tenth of the ring width of the annular copper sheet body.

[0017] As a preferred solution, the upper and lower surfaces of the annular copper sheet body are uniformly coated with an insulating film, and the circular inner ring through hole, the disconnection port, the separation groove and the cutting port are integrally punched on the copper sheet after coating to form the annular copper sheet body.

[0018] A transformer comprising a skeleton, a magnetic core mounted on the skeleton, and a plurality of copper sheet windings;

[0019] The copper sheet winding is a copper sheet winding as claimed in any one of the preceding claims.

[0020] The copper sheet windings are stacked up and down, the middle column of the magnetic core passes through the circular inner ring through hole of the copper sheet winding, and the separation groove is arranged around the outer peripheral side of the middle column; after the copper sheet winding is turned on, the separation groove effectively disperses the internal eddy current loss of the annular copper sheet body caused by energization, so as to reduce the eddy current loss generated after the annular copper sheet body is energized, and the cutting port is located on the outer peripheral side of the middle column of the magnetic core, so that the magnetic field eddy current loss of the magnetic core is effectively dispersed and avoided.

[0021] As a preferred solution, the front and rear sides of the skeleton are provided with pin positioning frames, a plurality of pin holes arranged in an up-down interval are arranged on the pin positioning frame, and the pin positioning frames are oppositely buckled on the side surface of the magnetic core. The lead-out pins of a plurality of copper sheet windings pass through the corresponding pin holes and are exposed to the outside of the pin positioning frame.

[0022] Compared with the prior art, the present application has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution, the main method is to stamp and cut a separation groove and a cutting port on the annular copper sheet body of the copper sheet winding. The separation groove is arranged in the circumferential direction of the annular copper sheet body, the separation groove penetrates the two end faces of the annular copper sheet body in the depth direction of the circular inner ring through hole, the separation groove separates the annular copper sheet body to form an inner ring body and an outer ring body, and the two ends of the inner ring body and the outer ring body are respectively connected to the corresponding two end portions. The cutting port penetrates the two end faces of the annular copper sheet body in the depth direction of the circular inner ring through hole, and the cutting port penetrates the circular inner ring through hole in the radial direction. In this way, after the copper sheet winding is turned on, the separation groove can effectively disperse the internal eddy current loss of the annular copper sheet body caused by energization, so as to reduce the eddy current loss generated after the annular copper sheet body is energized. At the same time, by using the cutting port of the copper sheet winding, the magnetic field eddy current loss at the joint of the magnetic core is effectively dispersed and avoided, the eddy current loss generated by the magnetic field eddy current on the copper sheet winding is improved, the thermal energy loss and the magnetic field loss at the air gap position are effectively improved, and the transformer can continuously and stably operate at a suitable temperature.

[0023] By optimizing the structure of the coated copper sheet, the skin effect of the current is reduced, the eddy current loss is reduced, and the efficiency of the transformer is improved. Moreover, the optimized coated copper sheet winding has a separation groove and a cutting port added on the original whole copper sheet, which is beneficial to cooling the copper sheet, effectively improves the heat dissipation efficiency, ensures the transformer to continuously and stably operate at a suitable temperature, improves the overall power of the transformer, and reduces the loss. When in use, the structure of the optimized coated copper sheet can balance the continuity of the magnetic current and the impedance of the coated copper sheet, so that the dispersed current is uniformly distributed in the effective cross-sectional area of the copper sheet, the magnetic field distribution is uniform during the operation of the transformer product, the eddy current loss is low, the anti-corona ability and high-frequency voltage bearing capacity are enhanced, and the overall efficiency of the transformer is improved by more than 0.5 to 0.7%.

[0024] For more clearly setting forth the structural features and effects of the present application, the present application will be described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a top view of the copper sheet winding of the first embodiment of the present application;

[0026] Figure 2 is a top view of the copper sheet winding of the second embodiment of the present application;

[0027] Figure 3 is a front view of a transformer with the copper sheet winding of the first (or second) embodiment applied thereon;

[0028] Figure 4 is a side view of a transformer with the copper sheet winding of the first (or second) embodiment applied thereon;

[0029] Figure 5 is a partial structure diagram of a connection between the lead-out pin and the lead wire.

[0030] The figure identification is as follows: annular copper sheet body 10, inner ring body 101, outer ring body 102, circular inner ring through hole 11, breakage opening 12, end portion 13, lead-out pin 14, separation groove 15, positioning cut edge 16, skeleton 1, copper sheet winding 2, middle column A, upper magnetic core 3, lower magnetic core 4, lead pin positioning frame 5, vertical plate portion 51, upper positioning plate portion 52, lower positioning plate portion 53, notch 141, extension edge 142, center line L, connection groove 6, lead wire 7, guide sleeve 8, lead wire welding position 9. DETAILED DESCRIPTION

[0031] Reference will now be made to Figures 1 to 5 , which shows the specific structure of the embodiments of the present application.

[0032] In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0033] A copper sheet winding comprises a ring-shaped copper sheet body 10, which is a film-coated copper sheet, i.e. the upper and lower surfaces of the ring-shaped copper sheet body 10 are uniformly coated with an insulating film. The ring-shaped copper sheet body 10 has a circular inner ring through hole 11, and a break opening 12 is arranged on the ring-shaped copper sheet body 10 and penetrates the circular inner ring through hole 11. The ring-shaped copper sheet body 10 is divided into two end portions 13 by the break opening 12, and the two end portions 13 each extend outward from the outer ring side of the ring-shaped copper sheet body 10 to form a lead-out pin 14.

[0034] The ring-shaped copper sheet body 10 is stamped and cut to form a separation groove 151 and a cutting opening 152.

[0035] The separation groove 151 is arranged along the circumferential direction of the ring-shaped copper sheet body 10 and penetrates the two end surfaces of the ring-shaped copper sheet body 10 along the hole depth direction of the circular inner ring through hole 11. The separation groove 151 divides the ring-shaped copper sheet body 10 into an inner ring body 101 and an outer ring body 102 located on the inner and outer sides of the separation groove 151, respectively, and the two ends of the inner ring body 101 and the outer ring body 102 are connected to the corresponding two end portions 13. The separation groove 151 is an arc-shaped groove. The separation groove 151 extends from one end of the ring-shaped copper sheet body 10 to the other end to separate the area of the separation groove 151 except the two end portions 13 to form the inner ring body 101 and the outer ring body 102. The ring width ratio of the inner ring body 101 to the outer ring body 102 is 0.7 to 1.5. The groove width of the separation groove 151 accounts for one-twentieth to one-tenth of the ring width of the ring-shaped copper sheet body 10.

[0036] Specifically, the cutting opening 152 is arranged on the inner ring side of the ring-shaped copper sheet body 10 and penetrates the two end surfaces of the ring-shaped copper sheet body 10 along the hole depth direction of the circular inner ring through hole 11, and the cutting opening 152 penetrates the circular inner ring through hole 11 along the radial direction. The number of cutting openings 152 can be arbitrarily set, and the shape of the cutting opening 152 can be rectangular, quasi-rectangular, semicircular, or other different shapes.

[0037] In production, a film-coated whole copper sheet (i.e. the upper and lower surfaces of the copper sheet are coated with an insulating film) is provided, and the circular inner ring through hole 11, the break opening 12, the separation groove 151, and the cutting opening 152 are integrally punched and cut on the film-coated whole copper sheet to form the ring-shaped copper sheet body 10. The circular inner ring through hole 11 can well match the shape of the center column of the magnetic core, and the shape of the circular inner ring through hole 11 can be completely matched with the design of the magnetic core, effectively reducing the leakage of the magnetic field, and achieving more superior electrical performance than the traditional copper sheet structure of the flat panel transformer. This production method is easy to control and has good controllability of product processing quality.

[0038] The cutting port 152 is kept apart from the breaking port 12, so that the cutting port 152 and the breaking port 12 are separated by the arc edge 16 of the inner ring side of the annular copper sheet body 10. The angle of the arc edge 16 of the inner ring side of the annular copper sheet body 10 is 30 to 150 degrees. The cutting port 152 is provided with two, the breaking port 12 is eccentrically arranged relative to a center line L of the annular copper sheet body 10, and the breaking port 12 is parallel to the center line L. Two cutting ports 152 are respectively located on both sides of the center line L. Generally, the connecting line of the two cutting ports 152 is perpendicular to the center line L. The outer ring side of the annular copper sheet body 10 is provided with a jig positioning cut edge 17, which is located on the opposite side of the lead-out leg 14, and the jig positioning cut edge 17 and the lead-out leg 14 are respectively located on both sides of the connecting line of the two cutting ports 152. The jig positioning cut edge 17 is a flat cut edge, which is a non-diameter chord of the annular copper sheet body 10. Of course, in the second embodiment, the jig positioning cut edge can not be provided.

[0039] The two end portions 13 can be designed in different shapes, which are easy to distinguish during installation, and are beneficial to improve work efficiency and reduce installation cost. As shown in Figure 2 A notch 141 is cut on at least one outer side edge of the lead-out leg 14, and then the remaining extension edge 142 is bent upward by 90 degrees, so that an L-shaped leg portion is formed. When the lead wire is welded on the L-shaped leg portion, a stable welding can be formed with the side surface of the extension edge 412. At the same time, a guide sleeve is sleeved on the outer periphery of the welding position in the subsequent process, and the guide sleeve wraps the extension edge and the lead wire welding position, thereby improving the connection stability and safety. The copper sheet winding has a simple structure, which only needs to be integrally punched and formed during punching.

[0040] Next, as shown in Figures 3 to 5 A transformer is introduced, taking an AI server transformer as an example, which comprises a skeleton 1 (an insulating part, for example, an injection molding part) and a magnetic core and a plurality of copper sheet windings 2 mounted on the skeleton 1. The copper sheet winding 2 is the copper sheet winding described in any of the preceding embodiments. The copper sheet windings 2 are stacked one above another. The central column A of the magnetic core passes through the circular inner ring through hole 11 of the copper sheet winding 2, and the separation groove 151 is arranged around the outer periphery of the central column. After the copper sheet winding is turned on, the separation groove 151 effectively disperses the internal eddy current loss of the annular copper sheet body 10 due to power-on, so as to reduce the eddy current loss generated after the annular copper sheet body 10 is powered on.

[0041] The magnetic core comprises an upper magnetic core 3 and a lower magnetic core 4, both of which are E-shaped magnetic cores, and the middle columns (cylindrical middle columns) of the upper magnetic core 3 and the lower magnetic core 4 are butted together. Specifically, the top of the skeleton 1 has a downwardly recessed embedding groove, the bottom of the lower magnetic core 4 is embedded in the embedding groove of the skeleton 1 to achieve positioning, then the copper sheet winding 2 is installed, and then the upper magnetic core 3 is assembled above the lower magnetic core 4, and the middle column A of the upper magnetic core 3 extends into the circular inner ring through hole 11 of the copper sheet winding 2.

[0042] In addition, the front and rear sides of the skeleton 1 are provided with pin positioning frames 5 (insulating parts, such as injection molded parts), a plurality of pin holes are arranged on the pin positioning frames 5, each pin hole is arranged corresponding to a plurality of outgoing pins 14 of the copper sheet winding 2, the pin positioning frame 5 comprises a vertical plate part 51, an upper positioning plate part 52 and a lower positioning plate part 53 connected to the upper and lower ends of the vertical plate part 51 respectively and extending towards the upper magnetic core 3 and the lower magnetic core 4 respectively, the pin holes are arranged on the vertical plate part 51, the upper positioning plate part 52 is located above the uppermost copper sheet winding 2, and the inner end of the upper positioning plate part 52 abuts against the top wall side of the upper magnetic core 3, similarly, the lower positioning plate part 53 is located below the lowermost copper sheet winding 2, and the inner end of the lower positioning plate part 53 abuts against the bottom wall side of the lower magnetic core 4, in this way, after the upper magnetic core 3 is installed, the pin positioning frames 5 on both sides are buckled towards each other on the side of the magnetic core, a plurality of outgoing pins 14 of the copper sheet winding 2 pass through the corresponding pin holes, then the extension edge 142 is bent upwards by 90 degrees to form an L-shaped pin part, and a wiring slot 6 is formed between the inner side of the extension edge 142 and the vertical plate part 51 of the pin positioning frame 5, when wiring, the lead wire 7 extends into the wiring slot 6, and the lead wire 7 is welded to the inner side of the extension edge 142 on the outer side of the pin positioning frame 5 (usually, the end side of the lead wire 7 is coated or adhered with solder paste 91, after extending into the wiring slot 6, partial heating is performed for welding), subsequently, the guide sleeve 8 also fully covers the lead wire welding part 9 on the outer side of the pin positioning frame 5, improving the connection stability and safety. The guide sleeve 8 is an insulating sleeve with a certain elasticity, which can be a silica gel sleeve, a rubber sleeve, etc., and is pre-installed on the lead wire 7 before soldering, but is far away from the welding position, after the welding work is completed and cooled, the guide sleeve is slid along the lead wire 7 to the lead wire welding position 9 in the subsequent process, further, a small amount of glue 61 can be dripped into the wiring slot 6 after the guide sleeve 8 is in place, so that the guide sleeve 8 and the outer side of the vertical plate part 51 are fixedly bonded, and the overall stability is better.

[0043] The design focus of the present application is that mainly by stamping and cutting a separation groove and a cutting port on the annular copper sheet body of the copper sheet winding, the separation groove is arranged along the circumferential direction of the annular copper sheet body, the separation groove penetrates the two end faces of the annular copper sheet body along the hole depth direction of the circular inner ring through hole, the separation groove separates the annular copper sheet body to form an inner ring body and an outer ring body, the two ends of the inner ring body and the outer ring body are connected to the corresponding two ends respectively, the cutting port penetrates the two end faces of the annular copper sheet body along the hole depth direction of the circular inner ring through hole, and the cutting port penetrates the circular inner ring through hole along the radial direction; in this way, after the copper sheet winding is turned on, the separation groove can effectively disperse the internal eddy current loss of the annular copper sheet body caused by power-on, so as to reduce the eddy current loss generated after the annular copper sheet body is powered on; at the same time, by using the cutting port of the copper sheet winding, the magnetic field eddy current loss at the joint of the magnetic core is effectively dispersed and avoided, the eddy current loss generated by the magnetic field eddy current on the copper sheet winding is improved, the thermal energy loss and the magnetic field loss at the air gap position are effectively improved, and the transformer can continuously and stably operate at a suitable temperature.

[0044] In the present application, the structure of the coated copper sheet is optimized to reduce the skin effect of current, reduce eddy current loss, and improve transformer efficiency; moreover, the optimized coated copper sheet winding has a separation groove and a cutting port added on the original whole copper sheet, which is beneficial to cooling the copper sheet, effectively improves the heat dissipation efficiency, ensures the transformer to continuously and stably operate at a suitable temperature, improves the overall power of the transformer, and reduces the loss. When in use, the structure of the optimized coated copper sheet can balance the continuity of the magnetic current and the impedance of the coated copper sheet, so that the dispersed current is uniformly distributed in the effective cross-sectional area of the copper sheet, the magnetic field distribution is uniform during operation of the transformer product, the eddy current loss is low, the anti-corona ability and high-frequency voltage bearing capacity are enhanced, and the overall efficiency of the transformer is improved by more than 0.5 to 0.7%.

[0045] The above is only a preferred embodiment of the present application, and does not limit the technical scope of the present application in any way, so any slight modification, equivalent change and modification made according to the technical essence of the present application to the above embodiment still belongs to the scope of the technical solution of the present application.

Claims

1. A copper sheet winding, comprising a ring-shaped copper sheet body (10) having a circular inner ring through hole (11), the ring-shaped copper sheet body (10) being provided with a break opening (12) penetrating the circular inner ring through hole (11), the ring-shaped copper sheet body (10) being divided into two end portions (13) by the break opening (12), and each of the two end portions (13) extending outward from the outer ring side of the ring-shaped copper sheet body (10) to have a lead-out pin (14); characterized in that: the ring-shaped copper sheet body (10) is stamped and cut to form a separation groove (151) and a cut opening (152); the separation groove (151) extends along the circumferential direction of the ring-shaped copper sheet body (10) and penetrates the two end faces of the ring-shaped copper sheet body (10) along the hole depth direction of the circular inner ring through hole (11), the separation groove (151) divides the ring-shaped copper sheet body (10) into an inner ring body (101) and an outer ring body (102) located on the inner side and the outer side of the separation groove (151) respectively, and the two ends of the inner ring body (101) and the outer ring body (102) are connected to the corresponding two end portions (13) respectively; the cut opening (152) penetrates the two end faces of the ring-shaped copper sheet body (10) along the hole depth direction of the circular inner ring through hole (11), and the cut opening (152) is located on the inner ring side of the separation groove (151) and penetrates the circular inner ring through hole (11) in the radial direction; the upper and lower surfaces of the ring-shaped copper sheet body (10) are uniformly covered with an insulating film, and the circular inner ring through hole (11), the break opening (12), the separation groove (151) and the cut opening (152) are integrally punched on the copper sheet after the film covering to form the ring-shaped copper sheet body (10). The cut opening (152) is spaced apart from the break opening (12) so that the cut opening (152) and the break opening (12) are separated by a circular arc edge (16) on the inner ring side of the ring-shaped copper sheet body (10). The cut opening (152) is provided with two cut openings, and the break opening (12) is eccentrically arranged relative to a center line (L) of the ring-shaped copper sheet body (10), and the two cut openings (152) are located on the two sides of the center line (L) respectively. The outer ring side of the ring-shaped copper sheet body (10) is provided with a jig positioning cut edge (17) located on the opposite side of the lead-out pin (14), and the jig positioning cut edge (17) and the lead-out pin (14) are located on the two sides of the connecting line of the two cut openings (152) respectively. The separation groove (151) extends from one end of the ring-shaped copper sheet body (10) to the other end to separate the area of the separation groove (151) except the two end portions (13) to form the inner ring body (101) and the outer ring body (102). The ring width ratio of the inner ring body (101) and the outer ring body (102) is 0.7 to 1.

5. ​ ​ ​ ​ 2. The copper sheet winding of claim 1, wherein: ​ 3. A copper bar winding according to claim 2, characterized in that: ​ 4. A copper bar winding as claimed in claim 3, characterized in that: ​ 5. A copper bar winding as defined in claim 1, characterized in that: ​ 6. A copper bar winding as defined in claim 1, characterized in that: ​ 7. A copper bar winding according to claim 1 or 6, characterized in that: The slot width of the separation slot (151) accounts for 1 / 20 to 1 / 10 of the ring width of the annular copper sheet body (10).

8. A transformer comprising a frame (1) and a magnetic core mounted on the frame (1), a plurality of copper sheet windings (2), characterized in that: The copper sheet winding (2) is the copper sheet winding according to any one of claims 1 to 7; A plurality of copper sheet windings (2) are arranged in a stack, a limb of the magnetic core passes through a circular inner ring through hole (11) of the copper sheet winding (2), and the separation slot (151) is arranged around the outer circumferential side of the limb; after the copper sheet winding (2) is turned on, the separation slot (151) effectively disperses the internal eddy current loss of the annular copper sheet body (10) caused by energization, so as to reduce the eddy current loss generated after the annular copper sheet body (10) is energized, and the cutting port (152) is located on the outer circumferential side of the limb of the magnetic core, so that the magnetic field eddy current loss of the magnetic core is effectively dispersed.

9. The transformer of claim 8, wherein: The front and rear sides of the frame (1) are provided with pin positioning frames (5), a plurality of pin holes arranged in an up-down interval are arranged on the pin positioning frame (5), the pin positioning frame (5) is buckled on the side surface of the magnetic core, and the lead-out pins (14) of a plurality of copper sheet windings (2) pass through the corresponding pin holes and are exposed to the outside of the pin positioning frame (5).

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