Planar transformer

Abstract

The utility model discloses a flat transformer, it includes a upper magnetic core, a lower magnetic core and a circuit board winding, the circuit board winding is established between the upper magnetic core with the lower magnetic core, the circuit board winding has a winding wiring structure, the winding wiring structure includes a plurality of upper layer wiring, a plurality of lower layer wiring and a plurality of connecting pieces, the plurality of lower layer wiring is established below the plurality of upper layer wiring, the extension direction of the plurality of lower layer wiring and the extension direction of the plurality of upper layer wiring are interlaced, the plurality of connecting pieces are connected in series the plurality of upper layer wiring with the plurality of lower layer wiring respectively, to constitute the wiring direction interlaced multiple strands winding, so, when the current is applied to the multiple strands winding, the magnetic flux that the multiple strands winding generates forms the effect of magnetic flux cancellation, thereby reduces the ac loss of winding, promotes the conversion efficiency of flat transformer.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to a flat-plate transformer. Background Technology

[0002] With the rapid development of voltage conversion technology, many novel transformers have been proposed and developed. Among them, planar transformers, compared with other types of transformers, have been widely used in recent years in miniaturized, high-efficiency power supply devices due to their small size, high conversion efficiency, and high temperature resistance, in order to improve the power density of the power supply device and increase the internal space utilization of the power supply device.

[0003] In existing technologies, to reduce the DC impedance of the windings of planar transformers, the current approach is to use a wiring design with the maximum area in the windings of conventional planar transformers. However, this design causes the magnetic flux in conventional planar transformers to easily cut into the windings, thereby forming eddy currents within the windings. This increases the AC losses (i.e., eddy current losses) of the windings and affects the conversion efficiency of conventional planar transformers.

[0004] Therefore, it is indeed necessary to propose better solutions to address the problems of the existing technologies mentioned above. Utility Model Content

[0005] In view of the problems existing in the prior art, the main purpose of this utility model is to provide a planar transformer that reduces AC losses in the windings and improves the conversion efficiency of the planar transformer through an interleaved circuit arrangement.

[0006] To solve the problems of the prior art, the technical solution adopted by this utility model is to make the aforementioned flat plate transformer include: First, install the magnetic core; A lower magnetic core is located below the upper magnetic core and is positioned opposite to the upper magnetic core; A circuit board winding is disposed between the upper magnetic core and the lower magnetic core, and has a winding wiring structure, the winding wiring structure including: Multiple upper-layer cabling; Multiple lower-level wirings are arranged below the multiple upper-level wirings, and the extension directions of the multiple lower-level wirings intersect with the extension directions of the multiple upper-level wirings. Multiple connectors are connected in series with the multiple upper-layer wirings and the multiple lower-layer wirings, respectively.

[0007] Preferably, the plurality of upper-layer cabling includes a plurality of first upper-layer cabling, a plurality of second upper-layer cabling, and a plurality of third upper-layer cabling, and the plurality of lower-layer cabling includes a plurality of first lower-layer cabling, a plurality of second lower-layer cabling, and a plurality of third lower-layer cabling; The extension directions of the plurality of first lower wirings intersect with the extension directions of the plurality of first upper wirings and the plurality of second upper wirings; the extension directions of the plurality of second lower wirings intersect with the extension directions of the plurality of second upper wirings and the plurality of third upper wirings; and the extension directions of the plurality of third lower wirings intersect with the extension directions of the plurality of third upper wirings and the plurality of first upper wirings. The plurality of first upper wirings, the plurality of first lower wirings, the plurality of second upper wirings, the plurality of second lower wirings, the plurality of third upper wirings, and the plurality of third lower wirings are sequentially connected in series with each other through the plurality of connectors.

[0008] Preferably, the multiple upper-layer cablings include multiple first upper-layer cablings, multiple second upper-layer cablings, multiple third upper-layer cablings, multiple fourth upper-layer cablings, multiple fifth upper-layer cablings, and multiple sixth upper-layer cablings; the multiple lower-layer cablings include multiple first lower-layer cablings, multiple second lower-layer cablings, multiple third lower-layer cablings, multiple fourth lower-layer cablings, multiple fifth lower-layer cablings, and multiple sixth lower-layer cablings. The extension directions of the plurality of first lower wirings intersect with the extension directions of the plurality of first upper wirings and the plurality of second upper wirings; the extension directions of the plurality of second lower wirings intersect with the extension directions of the plurality of second upper wirings and the plurality of third upper wirings; the extension directions of the plurality of third lower wirings intersect with the extension directions of the plurality of third upper wirings and the plurality of fourth upper wirings; the extension directions of the plurality of fourth lower wirings intersect with the extension directions of the plurality of fourth upper wirings and the plurality of fifth upper wirings; the extension directions of the plurality of fifth lower wirings intersect with the extension directions of the plurality of fifth upper wirings and the plurality of sixth upper wirings; and the extension directions of the plurality of sixth lower wirings intersect with the extension directions of the plurality of sixth upper wirings and the plurality of first upper wirings. The plurality of first upper wirings, the plurality of first lower wirings, the plurality of second upper wirings, the plurality of second lower wirings, the plurality of third upper wirings, the plurality of third lower wirings, the plurality of fourth upper wirings, the plurality of fourth lower wirings, the plurality of fifth upper wirings, the plurality of fifth lower wirings, the plurality of sixth upper wirings, and the plurality of sixth lower wirings are sequentially connected in series with each other through the plurality of connectors.

[0009] Preferably, the upper magnetic core has an upper base and a first upper magnetic post, the first upper magnetic post being formed on the lower surface of the upper base; The lower magnetic core has a lower base and a first lower magnetic post. The first lower magnetic post is formed on the upper surface of the lower base and corresponds to the position of the first upper magnetic post. There is a first air gap between the first lower magnetic post and the first upper magnetic post.

[0010] Preferably, the winding wiring structure surrounds the first upper magnetic post, the first air gap, and the first lower magnetic post.

[0011] Preferably, the number of winding wiring structures is three, and the three winding wiring structures include a first winding wiring structure, a second winding wiring structure and a third winding wiring structure. The first winding wiring structure surrounds the first air gap, the second winding wiring structure surrounds the first upper magnetic post and is located between the first winding wiring structure and the upper base, and the third winding wiring structure surrounds the first lower magnetic post and is located between the first winding wiring structure and the lower base.

[0012] Preferably, the number of winding wiring structures is two, the two winding wiring structures include a first winding wiring structure and a second winding wiring structure, and the circuit board winding also has two copper sheet windings, the two copper sheet windings include a first copper sheet winding and a second copper sheet winding. The first winding wiring structure surrounds the first upper magnetic post and is located near the upper side of the first air gap; the second winding wiring structure surrounds the first lower magnetic post and is located near the lower side of the first air gap; the first copper sheet winding surrounds the first upper magnetic post and is located between the first winding wiring structure and the upper base; the second copper sheet winding surrounds the first lower magnetic post and is located between the second winding wiring structure and the lower base.

[0013] Preferably, the upper magnetic core has an upper base; The lower magnetic core has a lower base and a first lower magnetic post, the first lower magnetic post being formed on the upper surface of the lower base, and a first air gap being formed between the first lower magnetic post and the upper base.

[0014] Preferably, the number of winding wiring structures is three, and the three winding wiring structures include a first winding wiring structure, a second winding wiring structure and a third winding wiring structure. The first winding wiring structure, the second winding wiring structure, and the third winding wiring structure respectively surround the first lower magnetic column. The first winding wiring structure is close to the lower side of the first air gap, the second winding wiring structure is located between the first winding wiring structure and the lower base, and the third winding wiring structure is located between the second winding wiring structure and the lower base.

[0015] Preferably, the number of winding wiring structures is two, the two winding wiring structures include a first winding wiring structure and a second winding wiring structure, and the circuit board winding also has two copper sheet windings, the two copper sheet windings include a first copper sheet winding and a second copper sheet winding. The first winding wiring structure, the second winding wiring structure, the first copper sheet winding, and the second copper sheet winding respectively surround the first lower magnetic column. The first winding wiring structure is close to the lower side of the first air gap. The second winding wiring structure is located between the first winding wiring structure and the lower base. The first copper sheet winding is located between the second winding wiring structure and the lower base. The second copper sheet winding is located between the first copper sheet winding and the lower base.

[0016] Preferably, the upper magnetic core has an upper base and a first upper magnetic post, the first upper magnetic post being formed on the lower surface of the upper base; The lower magnetic core has a lower base, and there is a first air gap between the first upper magnetic post and the lower base.

[0017] Preferably, the number of winding wiring structures is three, and the three winding wiring structures include a first winding wiring structure, a second winding wiring structure and a third winding wiring structure. The first winding wiring structure, the second winding wiring structure, and the third winding wiring structure respectively surround the first upper magnetic column. The first winding wiring structure is close to the upper side of the first air gap, the second winding wiring structure is located between the first winding wiring structure and the upper base, and the third winding wiring structure is located between the second winding wiring structure and the upper base.

[0018] Preferably, the number of winding wiring structures is two, the two winding wiring structures include a first winding wiring structure and a second winding wiring structure, and the circuit board winding also has two copper sheet windings, the two copper sheet windings include a first copper sheet winding and a second copper sheet winding. The first winding wiring structure, the second winding wiring structure, the first copper sheet winding, and the second copper sheet winding respectively surround the first upper magnetic column. The first winding wiring structure is close to the upper side of the first air gap. The second winding wiring structure is located between the first winding wiring structure and the upper base. The first copper sheet winding is located between the second winding wiring structure and the upper base. The second copper sheet winding is located between the first copper sheet winding and the upper base.

[0019] Preferably, the upper magnetic core has an upper base, a first upper magnetic post and a second upper magnetic post, wherein the first upper magnetic post and the second upper magnetic post are respectively formed on the lower surface of the upper base; The lower magnetic core has a lower base, a first lower magnetic post and a second lower magnetic post, the first lower magnetic post and the second lower magnetic post being formed on the upper surface of the lower base respectively; The first lower magnetic column corresponds to the first upper magnetic column in position, and there is a first air gap between the first lower magnetic column and the first upper magnetic column. The second lower magnetic column corresponds to the second upper magnetic column in position, and there is a second air gap between the second lower magnetic column and the second upper magnetic column.

[0020] Preferably, the number of winding wiring structures is four, and the four winding wiring structures include a first winding wiring structure, a second winding wiring structure, a third winding wiring structure and a fourth winding wiring structure. The first winding wiring structure surrounds the first lower magnetic post and is located near the lower side of the first air gap; the second winding wiring structure surrounds the second upper magnetic post and is located near the upper side of the second air gap; the third winding wiring structure surrounds the first upper magnetic post and is located between the second winding wiring structure and the upper base; and the fourth winding wiring structure surrounds the second lower magnetic post and is located between the first winding wiring structure and the lower base.

[0021] Preferably, the number of winding wiring structures is two, the two winding wiring structures include a first winding wiring structure and a second winding wiring structure, and the circuit board winding also has two copper sheet windings, the two copper sheet windings include a first copper sheet winding and a second copper sheet winding. The first winding wiring structure surrounds the first lower magnetic post and is close to the lower side of the first air gap; the second winding wiring structure surrounds the second upper magnetic post and is close to the upper side of the second air gap; the first copper sheet winding surrounds the first upper magnetic post and is located between the second winding wiring structure and the upper base; the second copper sheet winding surrounds the second lower magnetic post and is located between the first winding wiring structure and the lower base.

[0022] Preferably, the upper magnetic core has an upper base and a second upper magnetic post, the second upper magnetic post being formed on the lower surface of the upper base; The lower magnetic core has a lower base and a first lower magnetic post, the first lower magnetic post being formed on the upper surface of the lower base; The first lower magnetic column and the upper base have a first air gap, and the second upper magnetic column and the lower base have a second air gap.

[0023] Preferably, the number of winding wiring structures is four, and the four winding wiring structures include a first winding wiring structure, a second winding wiring structure, a third winding wiring structure and a fourth winding wiring structure. The first winding wiring structure surrounds the first lower magnetic post and is located near the lower side of the first air gap; the second winding wiring structure surrounds the second upper magnetic post and is located near the upper side of the second air gap; the third winding wiring structure surrounds the first lower magnetic post and is located between the first winding wiring structure and the second winding wiring structure; and the fourth winding wiring structure surrounds the second upper magnetic post and is located between the first winding wiring structure and the third winding wiring structure.

[0024] Preferably, the number of winding wiring structures is two, the two winding wiring structures include a first winding wiring structure and a second winding wiring structure, and the circuit board winding also has two copper sheet windings, the two copper sheet windings include a first copper sheet winding and a second copper sheet winding. The first winding wiring structure surrounds the first lower magnetic post and is close to the lower side of the first air gap; the second winding wiring structure surrounds the second upper magnetic post and is close to the upper side of the second air gap; the first copper sheet winding surrounds the first lower magnetic post and is located between the first winding wiring structure and the second winding wiring structure; the second copper sheet winding surrounds the second upper magnetic post and is located between the first winding wiring structure and the first copper sheet winding.

[0025] Preferably, the plurality of upper-layer wirings and the plurality of lower-layer wirings extend radially and are curved.

[0026] Preferably, the plurality of upper-layer wirings and the plurality of lower-layer wirings extend radially and are in a straight line.

[0027] Preferably, the plurality of upper-layer wirings and the plurality of lower-layer wirings each have an inner end and an outer end, the inner end and outer end of the upper-layer wirings each have a first inner end width and a first outer end width, the inner end and outer end of the lower-layer wirings each have a second inner end width and a second outer end width, the first outer end width is equal to or greater than the first inner end width, and the second outer end width is equal to or greater than the second inner end width.

[0028] According to the above structure, this utility model provides multiple upper-layer wirings and multiple lower-layer wirings with intersecting extension directions within the circuit board winding, and connects the multiple upper-layer wirings and multiple lower-layer wirings in series by multiple connectors to form a multi-strand winding with intersecting wiring directions. In this way, when current is applied to the multi-strand winding, the magnetic flux generated by the multi-strand winding can achieve the effect of magnetic flux cancellation, thereby reducing the AC loss of the winding and improving the conversion efficiency of the planar transformer. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the appearance of the first embodiment of the present utility model; Figure 2 This is an exploded view of the first embodiment of the present invention; Figure 3 This is the first embodiment of the present utility model. Figure 1 A sectional view along line segment A-A'; Figure 4 An exploded view of the winding wiring structure of the first embodiment of this utility model; Figure 5 This is a top view of the winding wiring structure of the first embodiment of the present invention; Figure 6 This is a schematic diagram of the current flow direction of the winding in the first embodiment of this utility model; Figure 7 This is an exploded view of the winding wiring structure of the second embodiment of the present invention; Figure 8 This is a top view of the winding wiring structure of the second embodiment of the present invention; Figure 9 This is a schematic diagram of the current flow direction of the winding in the second embodiment of this utility model; Figure 10 This is an exploded view of the winding wiring structure of the third embodiment of this utility model; Figure 11 This is a top view of the winding wiring structure of the third embodiment of this utility model; Figure 12 This is a schematic diagram of the current flow direction of the winding in the third embodiment of this utility model; Figure 13 This is an exploded view of the winding wiring structure of the fourth embodiment of this utility model; Figure 14 This is a top view of the winding wiring structure according to the fourth embodiment of the present invention; Figure 15 This is a schematic diagram of the current flow direction of the winding in the fourth embodiment of this utility model; Figure 16 This is a side view of the circuit board, not shown, of the fifth embodiment of this utility model; Figure 17 This is a side view of the circuit board, not shown, of the sixth embodiment of the present invention; Figure 18 This is a side view of the circuit board, not shown, of the seventh embodiment of the present invention; Figure 19 This is a side view of the circuit board, not shown, of the eighth embodiment of the present invention; Figure 20This is a side view of the circuit board, not shown, of the ninth embodiment of this utility model; Figure 21 This is a side view of the circuit board, not shown, of the tenth embodiment of the present invention; Figure 22 This is an exploded view of the eleventh embodiment of the present invention; Figure 23 This is a side view of the circuit board, not shown, of the eleventh embodiment of the present invention; Figure 24 This is a side view of the circuit board, not shown, of the twelfth embodiment of the present invention; Figure 25 This is a side view of the circuit board, not shown, of the thirteenth embodiment of the present invention; Figure 26 This is a side view of the circuit board, not shown, of the fourteenth embodiment of the present invention; Figure 27 This is the eleventh embodiment of the present invention, and a graph showing the relationship between current frequency and AC impedance in a conventional flat-plate transformer; Figure 28 This is the eleventh embodiment of the present invention, a graph showing the relationship between current frequency and total loss in a traditional flat-plate transformer. Detailed Implementation

[0030] For the first embodiment of the flat-plate transformer of this utility model, please refer to Figures 1 to 3 As shown, it includes an upper magnetic core 1, a lower magnetic core 2 and a circuit board winding 3. The lower magnetic core 2 is disposed below the upper magnetic core 1 and opposite to the upper magnetic core 1. The circuit board winding 3 is disposed between the upper magnetic core 1 and the lower magnetic core 2.

[0031] In this embodiment, the upper magnetic core 1 has an upper base 11 and a first upper magnetic post 12, the first upper magnetic post 12 being formed on the lower surface of the upper base 11; the lower magnetic core 2 has a lower base 21 and a first lower magnetic post 22, the lower base 21 being parallel to the upper base 11, the first lower magnetic post 22 being formed on the upper surface of the lower base 21, wherein the position of the first lower magnetic post 22 corresponds to the position of the first upper magnetic post 12, and a first air gap G1 is formed between the first lower magnetic post 22 and the first upper magnetic post 12.

[0032] The circuit board winding 3 is disposed between the upper base 11 and the lower base 21. The circuit board winding 3 has a circuit board 31 and a winding wiring structure 32. The circuit board 31 has a first through hole 311. The circuit board 31 is sleeved on the first upper magnetic post 12 and the first lower magnetic post 22 through the first through hole 311. The winding wiring structure 32 is disposed inside the circuit board 31 and surrounds the first through hole 311. Thus, when the upper magnetic core 1, the lower magnetic core 2 and the circuit board winding 3 are combined with each other, the winding wiring structure 32 surrounds the first upper magnetic post 12, the first air gap G1 and the first lower magnetic post 22.

[0033] like Figure 2 As shown, in this embodiment, the winding wiring structure 32 includes multiple upper-layer wirings 321, multiple lower-layer wirings 322, and multiple connectors 323. The multiple lower-layer wirings 322 are disposed below the multiple upper-layer wirings 321 and are spaced apart from the multiple upper-layer wirings 321. Furthermore, the extending directions of the multiple lower-layer wirings 322 intersect the extending directions of the multiple upper-layer wirings 321. The multiple connectors 323 are disposed between the multiple upper-layer wirings 321 and the multiple lower-layer wirings 322, and the multiple connectors 323 are connected in series with the multiple upper-layer wirings 321 and the multiple lower-layer wirings 322. For example, the multiple connectors 323 may be composed of multiple conductive vias.

[0034] Therefore, this utility model provides multiple upper-layer wirings 321 and multiple lower-layer wirings 322 with intersecting extension directions within the circuit board 31 of the circuit board winding 3, and connects the multiple upper-layer wirings 321 and multiple lower-layer wirings 322 in series by multiple connectors 323 to form a multi-strand winding with intersecting wiring directions; thus, when current is applied to the multi-strand winding, the magnetic flux generated by the multi-strand winding can form a magnetic flux cancellation effect, thereby reducing the AC loss of the winding and improving the conversion efficiency of the planar transformer.

[0035] For a detailed explanation of the winding wiring structure 32 described in this embodiment, please refer to [link to relevant documentation]. Figure 2 , Figure 4 and Figure 5As shown. In this embodiment, the plurality of upper layer wirings 321 are spaced apart from each other, and the plurality of upper layer wirings 321 extend outward from the first through hole 311 of the circuit board 31 in a radial manner, and are curved in a counterclockwise direction; the plurality of lower layer wirings 322 are spaced apart from each other, and the plurality of lower layer wirings 322 extend outward from the first through hole 311 in a radial manner, and are curved in a clockwise direction. In this embodiment, the plurality of upper layer wirings 321 and the plurality of lower layer wirings 322 each have an inner end and an outer end, the inner end of the plurality of upper layer wirings 321 is closer to the first upper magnetic post 12 than its outer end, and the inner end of the plurality of lower layer wirings 322 is closer to the first lower magnetic post 22 than its outer end. And, as Figure 4 As shown, the inner end and outer end of the upper layer wiring 321 have a first inner end width Wi1 and a first outer end width Wo1, respectively. The inner end and outer end of the lower layer wiring 322 have a second inner end width Wi2 and a second outer end width Wo2, respectively. In this embodiment, the first outer end width Wo1 is equal to the first inner end width Wi1, and the second outer end width Wo2 is equal to the second inner end width Wi2.

[0036] like Figure 4 and Figure 5 As shown, in this embodiment, the plurality of upper-layer wirings 321 include a plurality of first upper-layer wirings 3211, a plurality of second upper-layer wirings 3212, and a plurality of third upper-layer wirings 3213, and the plurality of lower-layer wirings 322 include a plurality of first lower-layer wirings 3221, a plurality of second lower-layer wirings 3222, and a plurality of third lower-layer wirings 3223. The plurality of first lower-layer wirings 3221, the plurality of second lower-layer wirings 3222, and the plurality of third lower-layer wirings 3223 are staggered with the plurality of first upper-layer wirings 3211, the plurality of second upper-layer wirings 3212, and the plurality of third upper-layer wirings 3213. Thus, the extension directions of the plurality of first lower wirings 3221 intersect with the extension directions of the plurality of first upper wirings 3211 and the plurality of second upper wirings 3212, the extension directions of the plurality of second lower wirings 3222 intersect with the extension directions of the plurality of second upper wirings 3212 and the plurality of third upper wirings 3213, and the extension directions of the plurality of third lower wirings 3223 intersect with the extension directions of the plurality of third upper wirings 3213 and the plurality of first upper wirings 3211.

[0037] The plurality of first upper wirings 3211, the plurality of first lower wirings 3221, the plurality of second upper wirings 3212, the plurality of second lower wirings 3222, the plurality of third upper wirings 3213, and the plurality of third lower wirings 3223 are sequentially connected in series with each other through the plurality of connectors 323.

[0038] Specifically, such as Figure 4 , Figure 6 As shown, the inner end of a first upper wire 3211A is connected to the inner end of a first lower wire 3221A via the connector 323. The outer end of the first lower wire 3221A is connected to the outer end of a second upper wire 3212A via the connector 323. The inner end of the second upper wire 3212A is connected to the inner end of a second lower wire 3222A via the connector 323. The outer end of the second lower wire 3222A is connected to the outer end of a third upper wire 3213A via the connector 323. The inner end of the third upper wire 3213A is connected to the inner end of a third lower wire 3223A via the connector 323. The outer end of the third lower wire 3223A is connected to the outer end of the first upper wire 3211A via the connector 323, thus forming a winding. The configuration of other windings is the same as described above, and will not be repeated here.

[0039] Thus, when current I is applied to the multiple first upper wires 3211 of the multi-strand winding, current I will flow sequentially through the multiple first lower wires 3221, the multiple second upper wires 3212, the multiple second lower wires 3222, the multiple third upper wires 3213, and the multiple third lower wires 3223 that are connected in series with each other. This creates an interlaced current flow between the upper and lower wires, allowing the magnetic flux generated between adjacent windings to cancel each other out because the directions of the magnetic flux are opposite. This prevents the magnetic flux generated by the winding from cutting into adjacent windings, thereby reducing the AC loss of the winding and improving the conversion efficiency of the planar transformer.

[0040] In addition, please refer to the following: Figure 3 As shown, by configuring the winding wiring structure 32 to surround the first air gap G1, the leakage flux lost from the first air gap G1 can cancel out the magnetic flux generated by the multi-strand windings in the winding wiring structure 32. This further prevents the leakage flux of the first air gap G1 from cutting into the multi-strand windings, thereby further reducing the AC loss of the windings and improving the conversion efficiency of the planar transformer. In this embodiment, the position and size of the first air gap G1 can be adaptively adjusted according to actual needs.

[0041] For example, the number of the plurality of first upper wiring 3211, the plurality of second upper wiring 3212, the plurality of third upper wiring 3213, the plurality of first lower wiring 3221, the plurality of second lower wiring 3222, and the plurality of third lower wiring 3223 can be six or twelve respectively.

[0042] For the second embodiment of this utility model, please refer to Figures 7 to 9As shown, its main technical content is the same as that of the first embodiment (e.g. Figures 1 to 6 The two are roughly the same as shown, except that the main difference lies in the slightly different ways in which the multiple upper layer wirings 321 and the multiple lower layer wirings 322 are extended.

[0043] In this embodiment, the inner ends of the plurality of upper-layer wirings 321 are respectively flush with the inner ends of the plurality of lower-layer wirings 322, and the outer ends of the plurality of upper-layer wirings 321 are respectively flush with the outer ends of the plurality of lower-layer wirings 322. Furthermore, as... Figure 7 As shown, in this embodiment, the first outer end width Wo1 of the outer end of the upper layer wiring 321 is greater than the first inner end width Wi1 of its inner end, and the second outer end width Wo2 of the outer end of the lower layer wiring 322 is greater than the second inner end width Wi2 of its inner end, so that the multiple upper layer wirings 321 and the multiple lower layer wirings 322 respectively form a wiring structure that is narrower inside and wider outside, thereby increasing the wiring area of ​​the multiple upper layer wirings 321 and the multiple lower layer wirings 322, so as to simultaneously reduce the DC impedance and AC loss of the winding.

[0044] For the third embodiment of this utility model, please refer to... Figures 10 to 12 As shown, its main technical content is the same as that of the first embodiment (e.g. Figures 1 to 6 The two are roughly the same as shown, except that the main difference lies in the shape and number of the multiple upper layer wirings 321 and the multiple lower layer wirings 322.

[0045] Please also refer to Figure 2 , Figure 10 and Figure 11 In this embodiment, Figure 2 The winding wiring structure 32 in the middle is based on Figure 10 and Figure 11 In this embodiment, the multiple upper-layer wirings 321 extend radially outward from the first through-hole 311 of the circuit board 31, and are inclined counterclockwise in a straight line; the multiple lower-layer wirings 322 extend radially outward from the first through-hole 311, and are inclined clockwise in a straight line. Furthermore, as... Figure 10 As shown, in this embodiment, the first outer width Wo1 of the outer end of the upper layer wiring 321 is equal to the first inner width Wi1 of its inner end, and the second outer width Wo2 of the outer end of the lower layer wiring 322 is equal to the second inner width Wi2 of its inner end.

[0046] In this embodiment, the multiple upper-layer wirings 321 include multiple first upper-layer wirings 3211, multiple second upper-layer wirings 3212, multiple third upper-layer wirings 3213, multiple fourth upper-layer wirings 3214, multiple fifth upper-layer wirings 3215, and multiple sixth upper-layer wirings 3216, and the multiple lower-layer wirings 322 include multiple first lower-layer wirings 3221, multiple second lower-layer wirings 3222, multiple third lower-layer wirings 3223, multiple fourth lower-layer wirings 3224, multiple fifth lower-layer wirings 3225, and multiple sixth lower-layer wirings 3226. The plurality of first lower wirings 3221, the plurality of second lower wirings 3222, the plurality of third lower wirings 3223, the plurality of fourth lower wirings 3224, the plurality of fifth lower wirings 3225, and the plurality of sixth lower wirings 3226 are staggered with the plurality of first upper wirings 3211, the plurality of second upper wirings 3212, the plurality of third upper wirings 3213, the plurality of fourth upper wirings 3214, the plurality of fifth upper wirings 3215, and the plurality of sixth upper wirings 3216.

[0047] Thus, the extension directions of the plurality of first lower wirings 3221 intersect with the extension directions of the plurality of first upper wirings 3211 and the plurality of second upper wirings 3212; the extension directions of the plurality of second lower wirings 3222 intersect with the extension directions of the plurality of second upper wirings 3212 and the plurality of third upper wirings 3213; and the extension directions of the plurality of third lower wirings 3223 intersect with the extension directions of the plurality of third upper wirings 3213 and the plurality of fourth upper wirings 3214. Incorrect. The extension directions of the plurality of fourth lower wirings 3224 intersect with the extension directions of the plurality of fourth upper wirings 3214 and the plurality of fifth upper wirings 3215. The extension directions of the plurality of fifth lower wirings 3225 intersect with the extension directions of the plurality of fifth upper wirings 3215 and the plurality of sixth upper wirings 3216. The extension directions of the plurality of sixth lower wirings 3226 intersect with the extension directions of the plurality of sixth upper wirings 3216 and the plurality of first upper wirings 3211.

[0048] The plurality of first upper wirings 3211, the plurality of first lower wirings 3221, the plurality of second upper wirings 3212, the plurality of second lower wirings 3222, the plurality of third upper wirings 3213, the plurality of third lower wirings 3223, the plurality of fourth upper wirings 3214, the plurality of fourth lower wirings 3224, the plurality of fifth upper wirings 3215, the plurality of fifth lower wirings 3225, the plurality of sixth upper wirings 3216, and the plurality of sixth lower wirings 3226 are sequentially connected in series with each other through the plurality of connectors 323.

[0049] Specifically, such as Figure 10 , Figure 12As shown, the inner end of a first upper wiring 3211A is connected to the inner end of a first lower wiring 3221A via the connector 323. The outer end of the first lower wiring 3221A is connected to the outer end of a second upper wiring 3212A via the connector 323. The inner end of the second upper wiring 3212A is connected to the inner end of a second lower wiring 3222A via the connector 323. The outer end of the second lower wiring 3222A is connected to the outer end of a third upper wiring 3213A via the connector 323. The inner end of the third upper wiring 3213A is connected to the inner end of a third lower wiring 3223A via the connector 323. The outer end of the third lower wiring 3223A is connected to the outer end of a fourth upper wiring 3214A via the connector 323. The inner end of wiring 3214A is connected to the inner end of a fourth lower wiring 3224A via connector 323. The outer end of the fourth lower wiring 3224A is connected to the outer end of a fifth upper wiring 3215A via connector 323. The inner end of the fifth upper wiring 3215A is connected to the inner end of a fifth lower wiring 3225A via connector 323. The outer end of the fifth lower wiring 3225A is connected to the outer end of a sixth upper wiring 3216A via connector 323. The inner end of the sixth upper wiring 3216A is connected to the inner end of a sixth lower wiring 3226A via connector 323. The outer end of the sixth lower wiring 3226A is connected to the outer end of the first upper wiring 3211A via connector 323, thus forming a winding. The configuration of other windings is the same as described above, and will not be repeated here.

[0050] Thus, when current I is applied to the multiple first upper wires 3211 of the multi-strand winding, current I will flow sequentially through the multiple first lower wires 3221, the multiple second upper wires 3212, the multiple second lower wires 3222, the multiple third upper wires 3213, the multiple third lower wires 3223, the multiple fourth upper wires 3214, the multiple fourth lower wires 3224, the multiple fifth upper wires 3215, the multiple fifth lower wires 3225, the multiple sixth upper wires 3216, and the multiple sixth lower wires 3226 connected in series with each other. This creates an interleaved current flow between the upper and lower wires, thereby enabling the magnetic flux generated between adjacent windings to cancel each other out. This prevents the magnetic flux generated by the windings from cutting into adjacent windings, achieving the effect of reducing the AC loss of the windings and improving the conversion efficiency of the planar transformer.

[0051] For example, the number of the plurality of first upper wiring 3211, the plurality of second upper wiring 3212, the plurality of third upper wiring 3213, the plurality of fourth upper wiring 3214, the plurality of fifth upper wiring 3215, the plurality of sixth upper wiring 3216, the plurality of first lower wiring 3221, the plurality of second lower wiring 3222, the plurality of third lower wiring 3223, the plurality of fourth lower wiring 3224, the plurality of fifth lower wiring 3225, and the plurality of sixth lower wiring 3226 can be ten or twelve respectively.

[0052] For the fourth embodiment of this utility model, please refer to... Figures 13 to 15 As shown, its main technical content is similar to that of the third embodiment (e.g.) Figures 10 to 12 The two are roughly the same as shown, except that the main difference lies in the slightly different ways in which the multiple upper layer wirings 321 and the multiple lower layer wirings 322 are extended.

[0053] like Figure 13 and Figure 14 As shown, in this embodiment, the inner ends of the plurality of upper-layer wirings 321 are respectively aligned with the inner ends of the plurality of lower-layer wirings 322, and the outer ends of the plurality of upper-layer wirings 321 are respectively aligned with the outer ends of the plurality of lower-layer wirings 322. Furthermore, as... Figure 13 As shown, in this embodiment, the first outer end width Wo1 of the outer end of the upper layer wiring 321 is greater than the first inner end width Wi1 of its inner end, and the second outer end width Wo2 of the outer end of the lower layer wiring 322 is greater than the second inner end width Wi2 of its inner end, so that the multiple upper layer wirings 321 and the multiple lower layer wirings 322 respectively form a wiring structure that is narrower inside and wider outside, thereby increasing the wiring area of ​​the multiple upper layer wirings 321 and the multiple lower layer wirings 322, so as to simultaneously reduce the DC impedance and AC loss of the winding.

[0054] For the fifth to fourteenth embodiments of this utility model, please refer to them in sequence. Figures 16 to 26 In order to clearly show the configuration relationship between the winding wiring structure and the air gap, Figures 16 to 21 , Figures 23 to 26 The circuit board 31 with circuit board winding 3 is not shown in the figure.

[0055] For the fifth and sixth embodiments of this utility model, please refer to them in sequence. Figure 16 and Figure 17 As shown, its main technical content is roughly the same as the first to fourth embodiments described above, except that the number of winding wiring structures 32 is different.

[0056] like Figure 16As shown, in the fifth embodiment of this utility model, the number of winding wiring structures 32 is three, including a first winding wiring structure 32A, a second winding wiring structure 32B, and a third winding wiring structure 32C. The first winding wiring structure 32A, the second winding wiring structure 32B, and the third winding wiring structure 32C are spaced apart from each other on the circuit board 31 (please refer to the accompanying documentation). Figure 3 Within the first winding wiring structure 32A, the first upper magnetic post 12, the first air gap G1, and the first lower magnetic post 22 are surrounded; the second winding wiring structure 32B surrounds the first upper magnetic post 12 and is located between the first winding wiring structure 32A and the upper base 11; and the third winding wiring structure 32C surrounds the first lower magnetic post 22 and is located between the first winding wiring structure 32A and the lower base 21.

[0057] This configuration allows the leakage flux lost from the first air gap G1 to cancel out the magnetic flux generated by the multiple windings in the first winding wiring structure 32A, thereby preventing the leakage flux of the first air gap G1 from cutting into the windings in the first winding wiring structure 32A or other winding wiring structures, thus reducing the AC loss of the windings and improving the conversion efficiency of the planar transformer.

[0058] like Figure 17 As shown, in the sixth embodiment of this utility model, the number of winding wiring structures 32 is two. The two winding wiring structures 32 include a first winding wiring structure 32A and a second winding wiring structure 32B. Furthermore, the circuit board winding 3 also has two copper sheet windings 33, each including a first copper sheet winding 33A and a second copper sheet winding 33B. In this embodiment, the first winding wiring structure 32A, the second winding wiring structure 32B, the first copper sheet winding 33A, and the second copper sheet winding 33B are spaced apart from each other on the circuit board 31 (please refer to the accompanying documentation). Figure 3 Within the first winding wiring structure 32A, the first winding wiring structure 32A surrounds the first upper magnetic post 12 and is located near the upper side of the first air gap G1. The second winding wiring structure 32B surrounds the first lower magnetic post 22 and is located near the lower side of the first air gap G1. The first copper sheet winding 33A surrounds the first upper magnetic post 12 and is located between the first winding wiring structure 32A and the upper base 11. The second copper sheet winding 33B surrounds the first lower magnetic post 22 and is located between the second winding wiring structure 32B and the lower base 21.

[0059] Thus, by setting the first winding wiring structure 32A and the second winding wiring structure 32B close to the upper and lower sides of the first air gap G1, and setting the first copper sheet winding 33A and the second copper sheet winding 33B far away from the first air gap G1, the leakage magnetic flux lost from the first air gap G1 can cancel out the magnetic flux generated by the multiple windings in the first winding wiring structure 32A and the second winding wiring structure 32B, thus preventing the leakage magnetic flux of the first air gap G1 from cutting into the windings in the first winding wiring structure 32A and the second winding wiring structure 32B, or cutting into other copper sheet windings.

[0060] For the seventh and eighth embodiments of this utility model, please refer to them in sequence. Figure 18 and Figure 19 As shown, its main technical content is the same as that of the fifth and sixth embodiments (e.g. Figure 16 , Figure 17 The two are roughly the same as shown, except that the main difference is that the position of the first air gap G1 is different.

[0061] like Figure 18 As shown, in the seventh embodiment of this utility model, the lower surface of the upper base 11 does not form the first upper magnetic post 12. Instead, the first lower magnetic post 22 extends further upward, and has the first air gap G1 between it and the upper base 11. In this embodiment, the first winding wiring structure 32A, the second winding wiring structure 32B, and the third winding wiring structure 32C respectively surround the first lower magnetic post 22. Furthermore, the first winding wiring structure 32A is close to the lower side of the first air gap G1, the second winding wiring structure 32B is located between the first winding wiring structure 32A and the lower base 21, and the third winding wiring structure 32C is located between the second winding wiring structure 32B and the lower base 21.

[0062] Thus, by setting the first winding wiring structure 32A close to the lower side of the first air gap G1, the leakage magnetic flux lost from the first air gap G1 can cancel out the magnetic flux generated by the multiple windings in the first winding wiring structure 32A, so as to avoid the leakage magnetic flux of the first air gap G1 cutting into the windings in the first winding wiring structure 32A or other winding wiring structures.

[0063] like Figure 19 As shown, in the eighth embodiment of this utility model, the third winding wiring structure 32C is replaced by the first copper sheet winding 33A and the second copper sheet winding 33B. In this embodiment, the first copper sheet winding 33A, the second copper sheet winding 33B, and the first winding wiring structure 32A and the second winding wiring structure 32B are spaced apart from each other on the circuit board 31 (please refer to the accompanying document). Figure 3 Within the first lower magnetic post 22, the first copper sheet winding 33A and the second copper sheet winding 33B respectively surround the first lower magnetic post 22. The first copper sheet winding 33A is located between the second winding wiring structure 32B and the lower base 21, and the second copper sheet winding 33B is located between the first copper sheet winding 33A and the lower base 21.

[0064] This configuration allows the first copper sheet winding 33A and the second copper sheet winding 33B to be kept away from the first air gap G1, further preventing leakage flux lost from the first air gap G1 from cutting into the first copper sheet winding 33A and the second copper sheet winding 33B, thus avoiding an increase in AC losses in the first copper sheet winding 33A and the second copper sheet winding 33B.

[0065] For the ninth and tenth embodiments of this utility model, please refer to them in sequence. Figure 20 and Figure 21 As shown, its main technical content is the same as that of the fifth and sixth embodiments (e.g. Figure 16 , Figure 17 The two are roughly the same as shown, except that the main difference is that the position of the first air gap G1 is also different.

[0066] like Figure 20 As shown, in the ninth embodiment of this utility model, the first lower magnetic post 22 is not formed on the upper surface of the lower base 21. Instead, the first upper magnetic post 12 extends further downward, and there is a first air gap G1 between it and the lower base 21. In this embodiment, the first winding wiring structure 32A, the second winding wiring structure 32B, and the third winding wiring structure 32C respectively surround the first upper magnetic post 12. Furthermore, the first winding wiring structure 32A is close to the upper side of the first air gap G1, the second winding wiring structure 32B is located between the first winding wiring structure 32A and the upper base 11, and the third winding wiring structure 32C is located between the second winding wiring structure 32B and the upper base 11.

[0067] Thus, by setting the first winding wiring structure 32A close to the upper side of the first air gap G1, the leakage magnetic flux lost from the first air gap G1 can cancel out the magnetic flux generated by the multiple windings in the first winding wiring structure 32A, so as to avoid the leakage magnetic flux of the first air gap G1 cutting into the windings in the first winding wiring structure 32A or other winding wiring structures.

[0068] like Figure 21As shown, in the tenth embodiment of this utility model, the third winding wiring structure 32C can be replaced by the first copper sheet winding 33A and the second copper sheet winding 33B. In this embodiment, the first copper sheet winding 33A, the second copper sheet winding 33B, and the first winding wiring structure 32A and the second winding wiring structure 32B are spaced apart from each other on the circuit board 31 (please refer to the accompanying document). Figure 3 Within the first lower magnetic post 22, the first copper sheet winding 33A and the second copper sheet winding 33B respectively surround the first lower magnetic post 22. The first copper sheet winding 33A is located between the second winding wiring structure 32B and the upper base 11, and the second copper sheet winding 33B is located between the first copper sheet winding 33A and the upper base 11.

[0069] This configuration allows the first copper sheet winding 33A and the second copper sheet winding 33B to be kept away from the first air gap G1, further preventing leakage flux lost from the first air gap G1 from cutting into the first copper sheet winding 33A and the second copper sheet winding 33B, thus avoiding an increase in AC losses in the first copper sheet winding 33A and the second copper sheet winding 33B.

[0070] For the eleventh and twelfth embodiments of this utility model, please refer to them in sequence. Figures 22 to 24 As shown, its main technical content is the same as that of the fifth and sixth embodiments (e.g. Figure 16 , Figure 17 The two are roughly the same as shown, except that the upper magnetic core 1 further includes a second upper magnetic post 13, the lower magnetic core 2 further includes a second lower magnetic post 23, and the structure of the circuit board winding 3 is different.

[0071] like Figure 22 , Figure 23 As shown, in the eleventh embodiment of this utility model, the second upper magnetic post 13 is formed on the lower surface of the upper base 11 and is spaced apart from the first upper magnetic post 12. The second lower magnetic post 23 is formed on the upper surface of the lower base 21 and is spaced apart from the first lower magnetic post 22. The position of the second lower magnetic post 23 corresponds to the position of the second upper magnetic post 13, and a second air gap G2 exists between the second lower magnetic post 23 and the second upper magnetic post 13.

[0072] The circuit board 31 is provided with a second through hole 312, which is spaced apart from the first through hole 311. The circuit board 31 is sleeved on the second upper magnetic post 13 and the second lower magnetic post 23 through the second through hole 312. In this embodiment, there are four winding wiring structures 32, including a first winding wiring structure 32A, a second winding wiring structure 32B, a third winding wiring structure 32C, and a fourth winding wiring structure 32D. The first winding wiring structure 32A, the second winding wiring structure 32B, the third winding wiring structure 32C, and the fourth winding wiring structure 32D are spaced apart within the circuit board 31. The first winding wiring structure 32A and the third winding wiring structure 32C are arranged around the first through hole 311, and the second winding wiring structure 32B and the fourth winding wiring structure 32D are arranged around the second through hole 312. Thus, when the upper magnetic core 1, the lower magnetic core 2, and the circuit board winding 3 are combined with each other, the first winding wiring structure 32A surrounds the first lower magnetic post 22 and is close to the lower side of the first air gap G1; the second winding wiring structure 32B surrounds the second upper magnetic post 13 and is close to the upper side of the second air gap G2; the third winding wiring structure 32C surrounds the first upper magnetic post 12 and is located between the second winding wiring structure 32B and the upper base 11; and the fourth winding wiring structure 32D surrounds the second lower magnetic post 23 and is located between the first winding wiring structure 32A and the lower base 21.

[0073] like Figure 24 As shown, in the twelfth embodiment of this utility model, the third winding wiring structure 32C and the fourth winding wiring structure 32D can also be replaced by the first copper sheet winding 33A and the second copper sheet winding 33B, respectively.

[0074] For the thirteenth and fourteenth embodiments of this utility model, please refer to them in sequence. Figure 25 and Figure 26 As shown, its main technical content is the same as that of embodiments eleven and twelfth (e.g. Figures 22 to 24 The two are roughly the same as shown, except that the main difference is that the positions of the first air gap G1 and the second air gap G2 are different.

[0075] like Figure 25As shown, in the thirteenth embodiment of this utility model, the first upper magnetic column 12 is not formed on the lower surface of the upper base 11, and the second lower magnetic column 23 is not formed on the upper surface of the lower base 21. Instead, the first lower magnetic column 22 extends further upward and has the first air gap G1 between it and the upper base 11, and the second upper magnetic column 13 extends further downward and has the second air gap G2 between it and the lower base 21.

[0076] In this embodiment, the first winding wiring structure 32A surrounds the first lower magnetic post 22 and is located near the lower side of the first air gap G1; the second winding wiring structure 32B surrounds the second upper magnetic post 13 and is located near the upper side of the second air gap G2; the third winding wiring structure 32C surrounds the first lower magnetic post 22 and is located between the first winding wiring structure 32A and the second winding wiring structure 32B; and the fourth winding wiring structure 32D surrounds the second upper magnetic post 13 and is located between the first winding wiring structure 32A and the third winding wiring structure 32C.

[0077] like Figure 26 As shown, in the fourteenth embodiment of this utility model, the third winding wiring structure 32C and the fourth winding wiring structure 32D can also be replaced by the first copper sheet winding 33A and the second copper sheet winding 33B as described above.

[0078] To further illustrate how the eleventh embodiment described above, through its configuration, can reduce the AC impedance and total loss of the planar transformer, please refer to [link / reference needed]. Figure 27 and Figure 28 As shown, Figure 27 The solid line C1 in the figure shows the AC impedance changes measured when different frequency currents are applied in the eleventh embodiment, and the dashed line C2 shows the AC impedance changes measured when different frequency currents are applied in the conventional planar transformer. Figure 28 The solid line C3 in the figure shows the change in total loss measured when different frequency currents are applied in the eleventh embodiment, while the dashed line C4 shows the change in total loss measured when different frequency currents are applied in the conventional planar transformer.

[0079] In the eleventh embodiment, the first winding wiring structure 32A, the second winding wiring structure 32B, the third winding wiring structure 32C, and the fourth winding wiring structure 32D respectively adopt the winding wiring structure as described in the third embodiment. Furthermore, the number of the plurality of first upper wiring 3211, the plurality of second upper wiring 3212, the plurality of third upper wiring 3213, the plurality of fourth upper wiring 3214, the plurality of fifth upper wiring 3215, the plurality of sixth upper wiring 3216, the plurality of first lower wiring 3221, the plurality of second lower wiring 3222, the plurality of third lower wiring 3223, the plurality of fourth lower wiring 3224, the plurality of fifth lower wiring 3225, and the plurality of sixth lower wiring 3226 in the first winding wiring structure 32A, the second winding wiring structure 32B, the third winding wiring structure 32C, and the fourth winding wiring structure 32D are each twelve. In contrast, conventional flat-plate transformers replace the first winding wiring structure 32A, the second winding wiring structure 32B, the third winding wiring structure 32C, and the fourth winding wiring structure 32D in the eleventh embodiment with four copper sheet windings.

[0080] Depend on Figure 27 and Figure 28 It can be seen that, through the configuration of the winding wiring structure 32, as the frequency of the applied current gradually increases, the AC impedance of the conventional planar transformer increases significantly, while the upward trend of the AC impedance in the eleventh embodiment is significantly mitigated. Furthermore, as the current frequency continues to increase and the AC effect strengthens, the total loss of the eleventh embodiment remains consistently lower than that of the conventional planar transformer. Therefore, the configuration proposed in the eleventh embodiment can effectively reduce the impact of flux cutting between adjacent windings and leakage flux cutting in the air gap on the windings, thereby improving energy conversion efficiency.

[0081] In summary, this utility model provides multiple upper-layer wirings and multiple lower-layer wirings with intersecting extension directions within the circuit board of the circuit board winding. Furthermore, multiple connectors connect these upper-layer and lower-layer wirings in series to form a multi-strand winding with intersecting wiring directions. Thus, when current is applied to the multi-strand winding, the magnetic flux generated by the multi-strand winding can cancel each other out, thereby reducing AC losses in the winding and improving the conversion efficiency of the planar transformer.

Claims

1. A flat-plate transformer, characterized in that, The flat-plate transformer includes: First, install the magnetic core; A lower magnetic core is located below the upper magnetic core and is positioned opposite to the upper magnetic core; A circuit board winding is disposed between the upper magnetic core and the lower magnetic core, and has a winding wiring structure, the winding wiring structure including: Multiple upper-layer cabling; Multiple lower-level wirings are arranged below the multiple upper-level wirings, and the extension directions of the multiple lower-level wirings intersect with the extension directions of the multiple upper-level wirings. Multiple connectors are connected in series with the multiple upper-layer wirings and the multiple lower-layer wirings, respectively.

2. The flat-plate transformer according to claim 1, characterized in that, The multiple upper-layer cablings include multiple first upper-layer cablings, multiple second upper-layer cablings, and multiple third upper-layer cablings; the multiple lower-layer cablings include multiple first lower-layer cablings, multiple second lower-layer cablings, and multiple third lower-layer cablings. The extension directions of the plurality of first lower wirings intersect with the extension directions of the plurality of first upper wirings and the plurality of second upper wirings; the extension directions of the plurality of second lower wirings intersect with the extension directions of the plurality of second upper wirings and the plurality of third upper wirings; and the extension directions of the plurality of third lower wirings intersect with the extension directions of the plurality of third upper wirings and the plurality of first upper wirings. The plurality of first upper wirings, the plurality of first lower wirings, the plurality of second upper wirings, the plurality of second lower wirings, the plurality of third upper wirings, and the plurality of third lower wirings are sequentially connected in series with each other through the plurality of connectors.

3. The flat-plate transformer according to claim 1, characterized in that, The multiple upper-layer cablings include multiple first upper-layer cablings, multiple second upper-layer cablings, multiple third upper-layer cablings, multiple fourth upper-layer cablings, multiple fifth upper-layer cablings, and multiple sixth upper-layer cablings; the multiple lower-layer cablings include multiple first lower-layer cablings, multiple second lower-layer cablings, multiple third lower-layer cablings, multiple fourth lower-layer cablings, multiple fifth lower-layer cablings, and multiple sixth lower-layer cablings. The extension directions of the plurality of first lower wirings intersect with the extension directions of the plurality of first upper wirings and the plurality of second upper wirings; the extension directions of the plurality of second lower wirings intersect with the extension directions of the plurality of second upper wirings and the plurality of third upper wirings; the extension directions of the plurality of third lower wirings intersect with the extension directions of the plurality of third upper wirings and the plurality of fourth upper wirings; the extension directions of the plurality of fourth lower wirings intersect with the extension directions of the plurality of fourth upper wirings and the plurality of fifth upper wirings; the extension directions of the plurality of fifth lower wirings intersect with the extension directions of the plurality of fifth upper wirings and the plurality of sixth upper wirings; and the extension directions of the plurality of sixth lower wirings intersect with the extension directions of the plurality of sixth upper wirings and the plurality of first upper wirings. The plurality of first upper wirings, the plurality of first lower wirings, the plurality of second upper wirings, the plurality of second lower wirings, the plurality of third upper wirings, the plurality of third lower wirings, the plurality of fourth upper wirings, the plurality of fourth lower wirings, the plurality of fifth upper wirings, the plurality of fifth lower wirings, the plurality of sixth upper wirings, and the plurality of sixth lower wirings are sequentially connected in series with each other through the plurality of connectors.

4. The flat-plate transformer according to claim 1, characterized in that, The upper magnetic core has an upper base and a first upper magnetic post, the first upper magnetic post being formed on the lower surface of the upper base; The lower magnetic core has a lower base and a first lower magnetic post. The first lower magnetic post is formed on the upper surface of the lower base and corresponds to the position of the first upper magnetic post. There is a first air gap between the first lower magnetic post and the first upper magnetic post.

5. The flat-plate transformer according to claim 4, characterized in that, The winding wiring structure surrounds the first upper magnetic post, the first air gap, and the first lower magnetic post.

6. The flat-plate transformer according to claim 4, characterized in that, The number of winding wiring structures is three, and the three winding wiring structures include a first winding wiring structure, a second winding wiring structure and a third winding wiring structure. The first winding wiring structure surrounds the first air gap, the second winding wiring structure surrounds the first upper magnetic post and is located between the first winding wiring structure and the upper base, and the third winding wiring structure surrounds the first lower magnetic post and is located between the first winding wiring structure and the lower base.

7. The flat-plate transformer according to claim 4, characterized in that, The number of winding wiring structures is two, and the two winding wiring structures include a first winding wiring structure and a second winding wiring structure. The circuit board winding also has two copper sheet windings, and the two copper sheet windings include a first copper sheet winding and a second copper sheet winding. The first winding wiring structure surrounds the first upper magnetic post and is located near the upper side of the first air gap; the second winding wiring structure surrounds the first lower magnetic post and is located near the lower side of the first air gap; the first copper sheet winding surrounds the first upper magnetic post and is located between the first winding wiring structure and the upper base; the second copper sheet winding surrounds the first lower magnetic post and is located between the second winding wiring structure and the lower base.

8. The flat-plate transformer according to claim 1, characterized in that, The upper magnetic core has an upper base; The lower magnetic core has a lower base and a first lower magnetic post, the first lower magnetic post being formed on the upper surface of the lower base, and a first air gap being formed between the first lower magnetic post and the upper base.

9. The flat-plate transformer according to claim 8, characterized in that, The number of winding wiring structures is three, and the three winding wiring structures include a first winding wiring structure, a second winding wiring structure and a third winding wiring structure. The first winding wiring structure, the second winding wiring structure, and the third winding wiring structure respectively surround the first lower magnetic column. The first winding wiring structure is close to the lower side of the first air gap, the second winding wiring structure is located between the first winding wiring structure and the lower base, and the third winding wiring structure is located between the second winding wiring structure and the lower base.

10. The flat-plate transformer according to claim 8, characterized in that, The number of winding wiring structures is two, and the two winding wiring structures include a first winding wiring structure and a second winding wiring structure. The circuit board winding also has two copper sheet windings, and the two copper sheet windings include a first copper sheet winding and a second copper sheet winding. The first winding wiring structure, the second winding wiring structure, the first copper sheet winding, and the second copper sheet winding respectively surround the first lower magnetic column. The first winding wiring structure is close to the lower side of the first air gap. The second winding wiring structure is located between the first winding wiring structure and the lower base. The first copper sheet winding is located between the second winding wiring structure and the lower base. The second copper sheet winding is located between the first copper sheet winding and the lower base.

11. The flat-plate transformer according to claim 1, characterized in that, The upper magnetic core has an upper base and a first upper magnetic post, the first upper magnetic post being formed on the lower surface of the upper base; The lower magnetic core has a lower base, and there is a first air gap between the first upper magnetic post and the lower base.

12. The flat-plate transformer according to claim 11, characterized in that, The number of winding wiring structures is three, and the three winding wiring structures include a first winding wiring structure, a second winding wiring structure and a third winding wiring structure. The first winding wiring structure, the second winding wiring structure, and the third winding wiring structure respectively surround the first upper magnetic column. The first winding wiring structure is close to the upper side of the first air gap, the second winding wiring structure is located between the first winding wiring structure and the upper base, and the third winding wiring structure is located between the second winding wiring structure and the upper base.

13. The flat-plate transformer according to claim 11, characterized in that, The number of winding wiring structures is two, and the two winding wiring structures include a first winding wiring structure and a second winding wiring structure. The circuit board winding also has two copper sheet windings, and the two copper sheet windings include a first copper sheet winding and a second copper sheet winding. The first winding wiring structure, the second winding wiring structure, the first copper sheet winding, and the second copper sheet winding respectively surround the first upper magnetic column. The first winding wiring structure is close to the upper side of the first air gap. The second winding wiring structure is located between the first winding wiring structure and the upper base. The first copper sheet winding is located between the second winding wiring structure and the upper base. The second copper sheet winding is located between the first copper sheet winding and the upper base.

14. The flat-plate transformer according to claim 1, characterized in that, The upper magnetic core has an upper base, a first upper magnetic post and a second upper magnetic post, the first upper magnetic post and the second upper magnetic post being formed on the lower surface of the upper base respectively; The lower magnetic core has a lower base, a first lower magnetic post and a second lower magnetic post, the first lower magnetic post and the second lower magnetic post being formed on the upper surface of the lower base respectively; The first lower magnetic column corresponds to the first upper magnetic column in position, and there is a first air gap between the first lower magnetic column and the first upper magnetic column. The second lower magnetic column corresponds to the second upper magnetic column in position, and there is a second air gap between the second lower magnetic column and the second upper magnetic column.

15. The flat-plate transformer according to claim 14, characterized in that, The number of winding wiring structures is four, and the four winding wiring structures include a first winding wiring structure, a second winding wiring structure, a third winding wiring structure and a fourth winding wiring structure. The first winding wiring structure surrounds the first lower magnetic post and is located near the lower side of the first air gap; the second winding wiring structure surrounds the second upper magnetic post and is located near the upper side of the second air gap; the third winding wiring structure surrounds the first upper magnetic post and is located between the second winding wiring structure and the upper base; and the fourth winding wiring structure surrounds the second lower magnetic post and is located between the first winding wiring structure and the lower base.

16. The flat-plate transformer according to claim 14, characterized in that, The number of winding wiring structures is two, and the two winding wiring structures include a first winding wiring structure and a second winding wiring structure. The circuit board winding also has two copper sheet windings, and the two copper sheet windings include a first copper sheet winding and a second copper sheet winding. The first winding wiring structure surrounds the first lower magnetic post and is close to the lower side of the first air gap; the second winding wiring structure surrounds the second upper magnetic post and is close to the upper side of the second air gap; the first copper sheet winding surrounds the first upper magnetic post and is located between the second winding wiring structure and the upper base; the second copper sheet winding surrounds the second lower magnetic post and is located between the first winding wiring structure and the lower base.

17. The flat-plate transformer according to claim 1, characterized in that, The upper magnetic core has an upper base and a second upper magnetic post, the second upper magnetic post being formed on the lower surface of the upper base; The lower magnetic core has a lower base and a first lower magnetic post, the first lower magnetic post being formed on the upper surface of the lower base; The first lower magnetic column and the upper base have a first air gap, and the second upper magnetic column and the lower base have a second air gap.

18. The flat-plate transformer according to claim 17, characterized in that, The number of winding wiring structures is four, and the four winding wiring structures include a first winding wiring structure, a second winding wiring structure, a third winding wiring structure and a fourth winding wiring structure. The first winding wiring structure surrounds the first lower magnetic post and is located near the lower side of the first air gap; the second winding wiring structure surrounds the second upper magnetic post and is located near the upper side of the second air gap; the third winding wiring structure surrounds the first lower magnetic post and is located between the first winding wiring structure and the second winding wiring structure; and the fourth winding wiring structure surrounds the second upper magnetic post and is located between the first winding wiring structure and the third winding wiring structure.

19. The flat-plate transformer according to claim 17, characterized in that, The number of winding wiring structures is two, and the two winding wiring structures include a first winding wiring structure and a second winding wiring structure. The circuit board winding also has two copper sheet windings, and the two copper sheet windings include a first copper sheet winding and a second copper sheet winding. The first winding wiring structure surrounds the first lower magnetic post and is close to the lower side of the first air gap; the second winding wiring structure surrounds the second upper magnetic post and is close to the upper side of the second air gap; the first copper sheet winding surrounds the first lower magnetic post and is located between the first winding wiring structure and the second winding wiring structure; the second copper sheet winding surrounds the second upper magnetic post and is located between the first winding wiring structure and the first copper sheet winding.

20. The flat-plate transformer according to claim 1, characterized in that, The multiple upper-layer wirings and the multiple lower-layer wirings extend radially and are curved.

21. The flat-plate transformer according to claim 1, characterized in that, The multiple upper-layer wirings and the multiple lower-layer wirings extend radially and are in a straight line.

22. The flat-plate transformer according to claim 20 or 21, characterized in that, The plurality of upper-layer wirings and the plurality of lower-layer wirings each have an inner end and an outer end, the inner end and the outer end of the upper-layer wirings each have a first inner end width and a first outer end width, the inner end and the outer end of the lower-layer wirings each have a second inner end width and a second outer end width, the first outer end width is equal to or greater than the first inner end width, and the second outer end width is equal to or greater than the second inner end width.

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