Spatial planar transformer and electronic equipment

Abstract

The invention relates to the technical field of magnetic devices, and discloses a space type planar transformer and electronic equipment. The space type planar transformer comprises a first wiring board and at least one second wiring board which are stacked; a magnetic column window is formed in the center of the first wiring plate and the center of the second wiring plate, at least one first coil assembly and at least one second coil assembly are arranged on the first wiring plate and the second wiring plate, the first coil assembly is wound around the outer side of the magnetic column window, and a gap is kept between the second coil assembly and the first coil assembly; or the second coil group is wound on the outer side of the magnetic column window, and the second coil group and the first coil group are alternately arranged; the first wiring board and the second wiring board are respectively provided with a connecting hole group, the first coil group on the first wiring board is electrically connected with the second coil group on the second wiring board through the connecting hole group, and the second coil group on the first wiring board is electrically connected with the first coil group on the second wiring board through the connecting hole group. The planar transformer space is optimized, and the device reliability is improved.

Description

Technical Field

[0001] The present application relates to the technical field of magnetic devices, and in particular to a spatial planar transformer and electronic equipment. Background Art

[0002] In the manufacturing process of magnetic devices, a planar transformer is a transformer that uses a planar structure instead of a traditional winding structure. It is widely used in various high-frequency and high-efficiency power supply systems, especially in situations where space and performance requirements are high. The winding coils of the planar transformers in the prior art are usually realized by developing and etching or laser etching processes on a PCB (printed circuit board). The winding method is usually spiral wiring. Different windings are usually connected using through holes to allow signals to be transmitted between multiple layers of the PCB. However, when PCB wiring is used for planar transformers in the prior art, it is necessary to consider that the coils avoid the through holes, and the buried hole or blind hole structure is more expensive. In order to avoid the through holes, the coils must be bent to a certain extent, resulting in a larger size of the planar transformer and a low cost-effectiveness. This situation needs to be changed. Summary of the invention

[0003] In view of this, the present application provides a spatial planar transformer and an electronic device to solve the above-mentioned technical problems.

[0004] To achieve the above objectives, according to the first aspect, the technical solution adopted is:

[0005] A space-type planar transformer, comprising:

[0006] a first wiring board and at least one second wiring board stacked;

[0007] A magnetic column window is opened at the center of the first wiring board and the second wiring board, and at least one first coil group and a second coil group are arranged on the first wiring board and the second wiring board, the first coil group is wound on the outside of the magnetic column window, and the second coil group is spaced apart from the first coil group, or the second coil group is wound on the outside of the magnetic column window and arranged alternately with the first coil group; a connection hole group is provided on the first wiring board and the second wiring board, wherein the first coil group on the first wiring board is electrically connected to the second coil group on the second wiring board through the connection hole group, and the second coil group on the first wiring board is electrically connected to the first coil group on the second wiring board through the connection hole group.

[0008] The present application is further configured as follows: when the second coil group is spaced apart from the first coil group, the first coil group includes a plurality of first single-turn wire layers, the second coil group includes a second single-turn wire layers having the same number as the first single-turn wire layers, and the plurality of first single-turn wire layers are sequentially arranged from close to the magnetic column window to away from the magnetic column window.

[0009] The present application is further configured as follows: the first single-turn wire layer on the first wiring board and the second single-turn wire layer on the second wiring board form a continuous winding coil through the connecting hole group, and the output / input end of the winding coil extends to the side of the first wiring board and is connected to the PIN pin of the first wiring board.

[0010] The present application is further configured as follows: the connection hole group includes a plurality of first functional holes and second functional holes linearly arranged on the first wiring board and the second wiring board, the first functional holes and the second functional holes are designed away from the magnetic column window, the first functional hole connects part of the first single-turn wire layer, and the second functional hole is connected to the head and tail ends of the second single-turn wire layer.

[0011] The present application is further configured such that: the projections of the first functional hole on the first wiring board and the second functional hole on the second wiring board, and the projections of the first functional hole on the second wiring board and the second functional hole on the first wiring board in a direction perpendicular to the working surfaces of the first wiring board and the second wiring board coincide with each other.

[0012] The present application is further configured as follows: when the second coil group is spaced apart from the first coil group, the first coil group is designed as a ring structure having a wiring gap, the second coil group is designed as a rectangular structure, the wiring gap is away from the second coil group, and the connection hole group is respectively located at the side of the second coil group and the wiring gap of the first coil group.

[0013] The present application is further configured as follows: the spacing between adjacent first functional holes or second functional holes is ≥8 mil, the aperture of the first functional holes or second functional holes is 6-10 mil, and the first functional holes and the second functional holes include through holes or blind buried holes.

[0014] The present application is further configured as follows: when the second coil group is wound around the outside of the magnetic column window and arranged alternately with the first coil group, the first coil group includes a first spiral wire layer, the second coil group includes a second spiral wire layer, and the first spiral wire layer and the second spiral wire layer are spirally arranged in parallel on the outside of the magnetic column window.

[0015] The present application is further configured as follows: the connection hole group includes a third functional hole and a fourth functional hole provided on the first wiring board and the second wiring board, wherein the third functional hole and the fourth functional hole respectively correspond to connecting one end of the first spiral wire layer and the second spiral wire layer close to the magnetic column window, and the other ends of the first spiral wire layer and the second spiral wire layer respectively extend to the sides of the first wiring board and the second wiring board and are connected to the PIN pins of the first wiring board and the second wiring board.

[0016] According to the second aspect, the technical solution adopted is:

[0017] An electronic device comprises the spatial planar transformer as described in any one of the above embodiments.

[0018] In summary, compared with the prior art, the present application discloses a spatial planar transformer and an electronic device, wherein the spatial planar transformer comprises a stacked first wiring board and at least one second wiring board; a magnetic column window is opened at the center of the first wiring board and the second wiring board, and at least one first coil group and a second coil group are arranged on the first wiring board and the second wiring board, the first coil group is wound on the outside of the magnetic column window, and the second coil group is spaced apart from the first coil group, or the second coil group is wound on the outside of the magnetic column window and arranged alternately with the first coil group; a connection hole group is provided on the first wiring board and the second wiring board, and the first coil group on the first wiring board is electrically connected to the second coil group on the second wiring board through the connection hole group, and the second coil group on the first wiring board is electrically connected to the first coil group on the second wiring board through the connection hole group, that is, through the above arrangement, the spatial structure of the planar transformer is optimized and the device cost performance is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a structural schematic diagram of a first wiring board of a first spatial planar transformer of the present application;

[0021] Figure 2 It is a structural schematic diagram of the second wiring board of the first spatial planar transformer of the present application;

[0022] Figure 3 is a schematic diagram of the spatial connection between the first coil group and the second coil group of the present application;

[0023] Figure 4is a structural schematic diagram of a first wiring board of a second spatial planar transformer of the present application;

[0024] Figure 5 It is a schematic structural diagram of the second wiring board of the second spatial planar transformer of the present application. DETAILED DESCRIPTION

[0025] Here, exemplary embodiments will be described in detail, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0026] It should be noted that, in this article, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element. In addition, components, features, and elements with the same name in different embodiments of the present application may have the same meaning or different meanings, and their specific meanings need to be determined by their explanation in the specific embodiment or further combined with the context of the specific embodiment.

[0027] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0028] In the subsequent description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present application, and have no specific meanings. Therefore, "module", "component" or "unit" can be used in a mixed manner.

[0029] In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0030] The technical solutions shown in this application will be described in detail below through specific embodiments. It should be noted that the description order of the following embodiments is not intended to limit the priority order of the embodiments.

[0031] Please refer to Figures 1 to 3 The spatial planar transformer of the present application has a stacked first wiring board 1 and at least one second wiring board 2, a magnetic column window 3 is opened at the center of the first wiring board 1 and the second wiring board 2, at least one first coil group 4 and a second coil group 5 are arranged on the first wiring board 1 and the second wiring board 2, the first coil group 4 is wound around the outside of the magnetic column window 3, the second coil group 5 is spaced apart from the first coil group 4, and a connection hole group 6 is provided on the first wiring board 1 and the second wiring board 2, wherein the first coil group 4 on the first wiring board 1 is electrically connected to the second coil group 5 on the second wiring board 2 through the connection hole group 6, and the second coil group 5 on the first wiring board 1 is electrically connected to the first coil group 4 on the second wiring board 2 through the connection hole group 6.

[0032] The spatial planar transformer has a magnetic column window 3 at the center of the first wiring board 1 and the second wiring board 2 for accommodating a magnetic column or a magnetic core assembly, wherein the magnetic column windows 3 of the first wiring board 1 and the second wiring board 2 are concentrically arranged, and a multi-layer superimposed spatial structure layout is formed by stacking the first wiring board 1 and at least one second wiring board 2, so as to accommodate more winding coils in a limited volume.

[0033] Among them, the second coil group 5 is kept at a distance from the first coil group 4 to ensure the magnetic field distribution on the first wiring board 1, reduce the magnetic field interference and uneven coupling between the winding coils, and by setting a connection hole group 6 on the first wiring board 1 and the second wiring board 2, the first coil group 4 on the first wiring board 1 can be electrically connected to the second coil group 5 on the second wiring board 2 to form a continuous winding coil. If this winding coil is set as a primary winding, the second coil group 5 on the first wiring board 1 is electrically connected to the first coil group 4 on the second wiring board 2 through the connection hole group 6 to form a secondary winding, thereby ensuring close coupling between the windings on the first wiring board 1 and the second wiring board 2.

[0034] The connection hole group 6 not only serves as an electrical connection path, but also provides a channel for heat conduction to a certain extent, especially in high-power application scenarios, which helps to guide the heat of the planar transformer from the inside to the outside for heat dissipation.

[0035] Different from the spiral wiring in the related art, the planar transformer of the present application arranges the primary winding and the secondary winding in layers through the first coil group 4 and the second coil group 5 of the cross structure and electrically connects them through the connection hole group 6. Through this alternating arrangement, the primary winding and the secondary winding are respectively distributed on different wiring boards, that is, respectively distributed on the first wiring board 1 and at least one second wiring board 2, forming an efficient electromagnetic coupling path, thereby releasing the coil arrangement space on a single wiring board and reducing the wiring difficulty. The primary winding and the secondary winding are arranged in layers and electrically connected through the connection hole group 6, which not only improves the space utilization of the wiring board, but also enhances the magnetic coupling strength between the windings, reduces the mutual inductance interference of the winding circuit, and optimizes the electrical performance of the planar transformer.

[0036] Furthermore, based on the first coil group 4 and the second coil group 5 on the first wiring board 1 and the second wiring board 2, the ratio of the number of coil turns of the primary winding and the secondary winding can be adjusted to meet different voltage conversion requirements, so that the planar transformer structure can adapt to applications of various power levels and frequency ranges, thereby improving the cost-effectiveness of the device.

[0037] It should be noted that both the first wiring board 1 and the second wiring board 2 can be PCB boards, and the material of the PCB boards can be high thermal conductivity boards such as aluminum substrates and ceramic substrates.

[0038] In the specific implementation process, the first coil group 4 is designed as a ring structure with a wiring gap Q, and the second coil group 5 is designed as a rectangular structure, wherein the wiring gap Q is designed away from the second coil group 5, and the connection hole group 6 can be located on the side of the second coil group 5 and the wiring gap of the first coil group 4, respectively. Therefore, the first coil group 4 and the second coil group 5 do not need to consider avoiding the through holes on the first wiring board 1 and the second wiring board 2, that is, the first coil group 4 and the second coil group 5 are regularly arranged with the connection hole group 6, thereby optimizing the spatial layout of the planar transformer and meeting the miniaturized design of the device, so as to be suitable for application scenarios with strict requirements on compactness and electromagnetic compatibility.

[0039] Furthermore, the first coil group 4 includes a plurality of first single-turn wire layers 41, and the second coil group 5 includes a second single-turn wire layer 51 having the same number as the first single-turn wire layer 41, so as to ensure that the first coil group 4 on the first wiring board 1 and the second coil group 5 on the second wiring board 2 form a continuous winding coil, wherein the plurality of first single-turn wire layers 41 are arranged in sequence from close to the magnetic column window 3 to away from the magnetic column window 3, and at the same time, the first single-turn wire layers 41 are concentrically designed to form a first coil group 4 with a ring structure having a wiring gap Q.

[0040] It can be understood that the number of first single-turn wire layers 41 of the first coil group 4 on the first wiring board 1 is different from the number of first single-turn wire layers 41 of the first coil group 4 on the second wiring board 1, that is, the coil turn ratio of the primary winding and the secondary winding is not 1.

[0041] Among them, the connection hole group 6 includes a plurality of first functional holes 61 and second functional holes 62 arranged linearly on the first wiring board 1 and the second wiring board 2. The first functional hole 61 connects the first single-turn layer 41, and the second functional hole 62 is connected to the head and tail ends of the second single-turn layer 51. Combined with the aforementioned first coil group 4 having a ring structure design with a wiring gap Q, and the second coil group 5 having a rectangular structure design, the wiring design of the planar transformer on the first wiring board 1 and the second wiring board 2 does not need to consider the problem of avoiding through holes in the related technology, and can also avoid the bending of the coil due to avoiding through holes, thereby optimizing the spatial layout of the planar transformer and meeting the miniaturization design of the device.

[0042] The first functional hole 61 and the second functional hole 62 are designed to be far away from the magnetic column window 3, thereby effectively avoiding the adverse effect of the opening of the holes on the voltage resistance performance of the magnetic column, and there is no need to add other insulating media to the magnetic column (such as high-temperature tapes and insulating sheets that wrap the magnetic column), thereby reducing the cost of raw materials and process technology of the device.

[0043] Preferably, the first functional hole 61 on the first wiring board 1 and the second functional hole 62 on the second wiring board 2, as well as the first functional hole 61 on the second wiring board 2 and the second functional hole 62 on the first wiring board 1 overlap in the projection direction perpendicular to the working surfaces of the first wiring board 1 and the second wiring board 2. Thus, the regular arrangement of the functional holes on the first wiring board 1 and the second wiring board 2, and the design of overlapping functional holes ensure that the functional connection between the first wiring board 1 and the second wiring board 2 is achieved within the shortest path, reducing the complex arrangement of the wires, thereby maximizing the use of the limited wiring board area, optimizing the functional space, and facilitating the electrical connection between the first coil group 4 on the first wiring board 1 and the second coil group 5 on the second wiring board 2, as well as the electrical connection between the second coil group 5 on the first wiring board 1 and the first coil group 4 on the second wiring board 2.

[0044] It should be noted that the first single-turn wire layer 41 on the first wiring board 1 and the second single-turn wire layer 51 on the second wiring board 2 form a continuous winding coil through the connecting hole group 6. Specifically, the first single-turn wire layer 41 on the first wiring board 1 is connected through the first functional hole 61 on the first wiring board 1 and the second single-turn wire layer 51 on the second wiring board 2 is connected through the second functional hole 62 on the second wiring board 2 to form a continuous winding coil. The output / input end 34a of this winding coil extends to the side of the first wiring board 1 and is connected to the PIN pin 1a of the first wiring board 1.

[0045] Similarly, the second single-turn layer 51 on the first wiring board 1 is connected to the first single-turn layer 41 on the second wiring board 2 through the second functional hole 61 on the second wiring board 2 through the second functional hole 62 on the first wiring board 1 to form a continuous winding coil. The output / input end 34b of this winding coil extends to the side of the first wiring board 2 and is connected to the PIN pin 2a of the first wiring board 2.

[0046] Thus, the first coil group 4 and the second coil group 5 are arranged in layers based on the first wiring board 1 and the second wiring board 2 through the first single-turn wire layer 41 and the second single-turn wire layer 51 and are electrically connected through the first functional hole 61 and the second functional hole 62. Through this alternating arrangement, the winding coils are distributed on different wiring boards, that is, they are distributed on the first wiring board 1 and at least one second wiring board 2, respectively, forming an efficient electromagnetic coupling path, thereby releasing the coil arrangement space on a single wiring board and reducing the wiring difficulty, which not only improves the space utilization of the wiring board, but also enhances the magnetic coupling strength between the windings, reduces the mutual inductance interference of the winding circuit, and optimizes the electrical performance of the planar transformer.

[0047] Optionally, the spacing between adjacent first functional holes 61 or second functional holes 62 is ≥8 (mil) mil to ensure that sufficient electrical insulation distance can be provided under the high-density wiring conditions of the first wiring board 1 and the second wiring board 2 to avoid electrical interference or short circuit risks. This spacing setting can also avoid process defects during the machining or drilling process between the functional holes, such as hole wall rupture, thermal stress concentration, etc., thereby improving the manufacturing reliability of the wiring board.

[0048] The aperture of the first functional hole 61 or the second functional hole 62 is 6-10 mil.

[0049] That is, the spacing and aperture design of the first functional holes 61 or the second functional holes 62 can effectively reduce the resistance and inductance losses in the conductive path, and improve the efficiency of the first coil group 4 and the second coil group 5 .

[0050] Preferably, the aperture of the first functional hole 61 or the second functional hole 62 is 8 mil.

[0051] Of course, the spacing and aperture design of the first functional holes 61 or the second functional holes 62 of the present application are not limited to this, and they can also be adaptively adjusted according to environmental requirements, which will not be elaborated here.

[0052] In a specific implementation process, the first functional hole 61 or the second functional hole 62 includes a through hole or a blind buried hole.

[0053] On the other hand, reference Figure 4 and Figure 5The spatial planar transformer comprises a first stacked wiring board 1 and at least one second wiring board 2, a magnetic column window 3 is opened at the center of the first wiring board 1 and the second wiring board 2, at least one first coil group 4 and a second coil group 5 are arranged on the first wiring board 1 and the second wiring board 2, the first coil group 4 is wound on the outside of the magnetic column window 3, the second coil group 5 is wound on the outside of the magnetic column window 3 and is alternately arranged with the first coil group 4, and a connection hole group 6 is provided on the first wiring board 1 and the second wiring board 2, wherein the first coil group 4 on the first wiring board 1 is electrically connected to the second coil group 5 on the second wiring board 2 through the connection hole group 6, and the second coil group 5 on the first wiring board 1 is electrically connected to the first coil group 4 on the second wiring board 2 through the connection hole group 6.

[0054] The first coil group 4 of the spatial planar transformer is wound on the outside of the magnetic column window 3, and the second coil group 5 is wound on the outside of the magnetic column window 3 and arranged alternately with the first coil group 4. This design maximizes the use of the effective wiring space of the wiring board and improves the space utilization rate of the transformer. The alternating arrangement of the first coil group 4 and the second coil group 5 makes the winding arrangement of the planar transformer compact, which can optimize the device flux distribution, reduce the leakage inductance of the device, increase the coupling capability, and thus improve the device performance.

[0055] Preferably, the first coil group 4 includes a first helical layer 43 , and the second coil group 5 includes a second helical layer 44 . The first helical layer 43 and the second helical layer 44 are helically arranged in parallel on the outer side of the magnetic column window 3 .

[0056] In addition, the connection hole group 6 includes a third functional hole 63 and a fourth functional hole 64 provided on the first wiring board 1 and the second wiring board 2, wherein the third functional hole 63 and the fourth functional hole 64 respectively correspond to connecting one end of the first spiral layer 43 and the second spiral layer 44 close to the magnetic column window 3, and the other ends of the first spiral layer 43 and the second spiral layer 44 respectively extend to the sides of the first wiring board 1 and the second wiring board 2 and are connected to the PIN pins of the first wiring board 1 and the second wiring board 2.

[0057] That is, the first spiral layer 43 on the first wiring board 1 of the planar transformer is connected to the second spiral layer 44 on the second wiring board 2 through the third functional hole 63 on the first wiring board 1 and the fourth functional hole 64 on the second wiring board 2 to form a continuous winding coil, and the second spiral layer 44 on the first wiring board 1 is connected to the first spiral layer 43 on the second wiring board 2 through the fourth functional hole 64 on the first wiring board 1 and the third functional hole 63 on the second wiring board 2 to form a continuous winding coil.

[0058] Thus, the first coil group 4 and the second coil group 5 are arranged in layers based on the first wiring board 1 and the second wiring board 2 through the first spiral layer 43 and the second spiral layer 44 and are electrically connected through the third functional hole 63 and the fourth functional hole 64. Through this arrangement, the winding coils are distributed on different wiring boards, that is, they are distributed on the first wiring board 1 and at least one second wiring board 2, respectively, to form an efficient electromagnetic coupling path, thereby releasing the coil arrangement space on a single wiring board and reducing the wiring difficulty. This not only improves the space utilization of the wiring board and meets the requirements of device miniaturization, but also enhances the magnetic coupling strength between the windings, reduces the mutual inductance interference of the winding circuit, and optimizes the electrical performance of the planar transformer.

[0059] The present application also discloses an electronic device, including a spatial planar transformer as in any of the above embodiments. For other working principles and processes of the electronic device of this embodiment, please refer to the description of the spatial planar transformer in the above embodiment, which will not be repeated here.

[0060] The spatial planar transformer and electronic device provided by the present application are introduced in detail above, and the principle and implementation method of the present application are explained in this article by using specific examples. It should be noted that in the present application, the description of each embodiment has its own emphasis, and for the part that is not described or recorded in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0061] The above are only preferred embodiments of the present application, and the patent scope of the present application is not limited thereto. The various technical features of the technical solution of the present application can be arbitrarily combined. In order to make the description concise, not all possible combinations of the various technical features in the above embodiments are described. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of this application, or directly or indirectly used in other related technical fields, as long as there is no contradiction in the combination of these technical features, are equally included in the patent protection scope of the present application.

Claims

1. A space-type planar transformer, characterized in that: include: a first wiring board and at least one second wiring board stacked; A magnetic column window is opened at the center of the first wiring board and the second wiring board, and at least one first coil group and a second coil group are arranged on the first wiring board and the second wiring board, the first coil group is wound on the outside of the magnetic column window, and the second coil group is spaced apart from the first coil group, or the second coil group is wound on the outside of the magnetic column window and arranged alternately with the first coil group; a connection hole group is provided on the first wiring board and the second wiring board, wherein the first coil group on the first wiring board is electrically connected to the second coil group on the second wiring board through the connection hole group, and the second coil group on the first wiring board is electrically connected to the first coil group on the second wiring board through the connection hole group.

2. The spatial planar transformer according to claim 1, characterized in that: When the second coil group is spaced apart from the first coil group, the first coil group includes a plurality of first single-turn wire layers, the second coil group includes a second single-turn wire layers having the same number as the first single-turn wire layers, and the plurality of first single-turn wire layers are sequentially arranged from close to the magnetic column window to away from the magnetic column window.

3. The spatial planar transformer according to claim 2, characterized in that: The first single-turn wire layer on the first wiring board and the second single-turn wire layer on the second wiring board form a continuous winding coil through the connecting hole group, and the output / input end of the winding coil extends to the side of the first wiring board and is connected to the PIN pin of the first wiring board.

4. The spatial planar transformer according to claim 2, characterized in that: The connection hole group includes a plurality of first functional holes and second functional holes which are linearly arranged on the first wiring board and the second wiring board. The first functional holes and the second functional holes are designed to be far away from the magnetic column window. The first functional hole connects part of the first single-turn wire layer, and the second functional hole is connected to both ends of the second single-turn wire layer.

5. The spatial planar transformer according to claim 3, characterized in that: The projections of the first functional hole on the first wiring board and the second functional hole on the second wiring board, and the projections of the first functional hole on the second wiring board and the second functional hole on the first wiring board in a direction perpendicular to the working surfaces of the first wiring board and the second wiring board coincide with each other.

6. The spatial planar transformer according to claim 1, characterized in that: When the second coil group is spaced apart from the first coil group, the first coil group is designed in an annular structure with a wiring gap, the second coil group is designed in a rectangular structure, the wiring gap is away from the second coil group, and the connection hole group is respectively located at the side of the second coil group and the wiring gap of the first coil group.

7. The spatial planar transformer according to claim 4, characterized in that: The spacing between adjacent first functional holes or second functional holes is ≥8 mil, the aperture of the first functional holes or second functional holes is 6-10 mil, and the first functional holes and the second functional holes include through holes or blind buried holes.

8. The spatial planar transformer according to claim 1, characterized in that: When the second coil group is wound on the outside of the magnetic column window and arranged alternately with the first coil group, the first coil group includes a first spiral line layer, the second coil group includes a second spiral line layer, and the first spiral line layer and the second spiral line layer are spirally arranged in parallel on the outside of the magnetic column window.

9. The spatial planar transformer according to claim 8, characterized in that: The connection hole group includes a third functional hole and a fourth functional hole arranged on the first wiring board and the second wiring board, wherein the third functional hole and the fourth functional hole respectively correspond to connecting one end of the first spiral wire layer and the second spiral wire layer close to the magnetic column window, and the other ends of the first spiral wire layer and the second spiral wire layer respectively extend to the sides of the first wiring board and the second wiring board and are connected to the PIN pins of the first wiring board and the second wiring board.

10. An electronic device, characterized in that: It comprises the spatial planar transformer as claimed in any one of claims 1 to 9.

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