Electromagnetic induction device and power conversion apparatus

Abstract

The application provides an electromagnetic induction device and a power conversion device, which comprises a magnetic core and a winding arranged on the magnetic core, the winding comprises a winding main body and a terminal connected to both ends of the winding main body, the winding main body comprises a first conductive sheet and a second conductive sheet arranged in a stack, the outer surfaces of the first conductive sheet and the second conductive sheet are provided with insulating layers, and the first conductive sheet and the second conductive sheet are communicated at the terminal; at least one transposition area is arranged on the extension path of the winding main body, in the transposition area, the side of the first conductive sheet is provided with a first slot, the side of the second conductive sheet is provided with a second slot, and the first slot and the second slot are oppositely inserted to make the first conductive sheet and the second conductive sheet cross and stack. In this way, the current is uniformly distributed, and the loss and heat dissipation pressure of the winding are reduced.

Description

Technical Field

[0001] This application relates to the field of electromagnetic induction product technology, specifically to an electromagnetic induction device and a power conversion device. Background Technology

[0002] In electromagnetic induction devices such as planar transformers and planar inductors, multiple layers of thin copper sheets are typically stacked and connected in parallel to form the winding coil, thereby increasing the effective conductive cross-sectional area. However, due to the differences in magnetic field strength at the locations of the thin copper sheets, the induced electromotive force and impedance of the different layers are not equal, resulting in uneven current distribution. Consequently, some thin copper sheets carry a large current, significantly increasing losses and temperature rise. Summary of the Invention

[0003] In view of this, this application provides an electromagnetic induction device and a power conversion device, which is beneficial for uniform current distribution and reduces winding losses and heat dissipation pressure.

[0004] To achieve the above objectives, this application provides the following technical solution: An electromagnetic induction device includes a magnetic core and a winding wound on the magnetic core. The winding includes a winding body and terminals connected to both ends of the winding body. The winding body includes a first conductive sheet and a second conductive sheet stacked on top of each other. An insulating layer is provided on the outer surface of both the first conductive sheet and the second conductive sheet. The first conductive sheet and the second conductive sheet are connected at the terminals. At least one transposition region is arranged on the extension path of the winding body. In the transposition region, a first slot is provided on the side of the first conductive sheet, and a second slot is provided on the side of the second conductive sheet. The first slot and the second slot are inserted into each other so that the first conductive sheet and the second conductive sheet are cross-stacked.

[0005] Optionally, in the transposition area, the first conductive sheet has two first conductive portions misaligned on the extension path of the winding body and a first bent portion connected between the two first conductive portions, and the second conductive sheet has two second conductive portions misaligned on the extension path of the winding body and a second bent portion connected between the two second conductive portions, the first bent portion being inserted into the second slot, and the second bent portion being inserted into the first slot.

[0006] Optionally, the number of transposition regions is set to two or more.

[0007] Optionally, the transposition regions are evenly distributed along the extension path of the winding body.

[0008] Optionally, in any two adjacent transposition regions, the two first slots are located on the same side of the first conductive sheet, the two first bends are located on the same side of the first conductive sheet, the two second slots are located on the same side of the second conductive sheet, and the two second bends are located on the same side of the second conductive sheet.

[0009] Optionally, in any two adjacent transposition regions, the two first slots are located on both sides of the first conductive sheet, the two first bends are located on both sides of the first conductive sheet, the two second slots are located on both sides of the second conductive sheet, and the two second bends are located on both sides of the second conductive sheet.

[0010] Optionally, in the vertical direction of the extension path of the winding body, the sum of the slot depths of the first slot and the second slot is greater than or equal to the width of the first conductive sheet or the second conductive sheet.

[0011] Optionally, the first slot and the second slot have the same depth.

[0012] Optionally, the shortest distance between two adjacent transposition regions along the extension path of the winding body is greater than or equal to 5 times the thickness of the first conductive sheet or the second conductive sheet.

[0013] Optionally, the slot width of the first slot on the extension path of the winding body is greater than or equal to twice the thickness of the first conductive sheet; the slot width of the second slot on the extension path of the winding body is greater than or equal to twice the thickness of the second conductive sheet.

[0014] A power conversion device includes an electromagnetic induction device as described in any of the preceding claims.

[0015] The electromagnetic induction device and power conversion device provided in this application can make the first conductive sheet and the second conductive sheet cross-stacked by setting a transposition area on the extension path of the winding. The conductive sheets that were originally distributed in layers can physically interchange at the transposition area, so that each current path can undergo at least one level transformation, thereby making the electromotive force and impedance of each current path tend to be consistent, which is beneficial to the uniform distribution of current and reduces the winding loss and heat dissipation pressure. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a perspective view of the winding shown for some embodiments of this application.

[0018] Figure 2 A front view of the winding shown for some embodiments of this application.

[0019] Figure 3 This is an exploded view of the first conductive sheet and the second conductive sheet shown in the first embodiment of this application.

[0020] Figure 4 This is a diagram illustrating the combination of a first conductive sheet and a second conductive sheet according to a first embodiment of this application.

[0021] Figure 5 This is a front view of the first conductive sheet and the second conductive sheet shown in the first embodiment of this application.

[0022] Figure 6 An exploded view of the first and second conductive sheets shown in the second embodiment of this application.

[0023] Figure 7 This is a diagram illustrating the combination of the first conductive sheet and the second conductive sheet according to a second embodiment of this application.

[0024] Figure 8 This is a front view of the first and second conductive sheets shown in the second embodiment of this application.

[0025] Figure 9 This is an assembly diagram of the first and second conductive sheets shown for some embodiments of this application.

[0026] Figure 10 The current density diagrams of the first and second conductive sheets are shown for some embodiments of this application.

[0027] Explanation of reference numerals in the attached drawings: 100, winding body; 101, current input terminal; 102, current output terminal; 103, transposition area; 11, first conductive sheet; 12, second conductive sheet; 13, first slot; 14, second slot; 15, first bend; 16, second bend. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] like Figures 1 to 10As shown, this application provides an electromagnetic induction device, including a magnetic core and a winding disposed around the magnetic core. The winding is used to generate or induce a magnetic field in the electromagnetic induction device. Specifically, the electromagnetic induction device can be a planar transformer or a planar inductor. When the electromagnetic induction device operates as a planar transformer, the winding can be used as a primary winding, a secondary winding, or both a primary and secondary winding. When operating as a planar inductor, the winding is an inductor coil.

[0030] The winding includes a winding body 100 and terminals connected to both ends of the winding body 100. The winding body 100 provides a current flow path, and the two terminals are a current input terminal 101 and a current output terminal 102, respectively. The winding body 100 has a first conductive sheet 11 and a second conductive sheet 12 stacked together. An insulating layer is provided on the outer surface of both the first conductive sheet 11 and the second conductive sheet 12 to maintain electrical isolation between adjacent first conductive sheets 11 and second conductive sheets 12 and prevent interlayer short circuits. The first conductive sheet 11 and the second conductive sheet 12 can be made of conductive sheets, such as copper sheets, aluminum sheets, or other metal sheets; the insulating layer is made of materials such as epoxy board or FR4, and can be fixed to the conductive sheets by bonding or other methods. Here, the thickness direction refers to the stacking direction of the first conductive sheet 11 and the second conductive sheet 12, i.e., as shown in the figure. Figure 5 and Figure 8 The up and down directions are shown.

[0031] The first conductive piece 11 and the second conductive piece 12 both extend to both ends of the winding body 100, and the first conductive piece 11 and the second conductive piece 12 are connected at two terminals (i.e., current input terminal 101 and current output terminal 102) so that the two ends of the first conductive piece 11 and the second conductive piece 12 are electrically connected, so that the first conductive piece 11 and the second conductive piece 12 form the winding body 100 in parallel.

[0032] At least one transposition region 103 is arranged along the extension path of the winding body 100. This extension path is the physical path traversed by the current input terminal 101 to the current output terminal 102 in the winding body 100, and can be a straight segment, an arc segment, or part of a closed loop path. Within each transposition region 103, a first slot 13 is provided on the side of the first conductive sheet 11, and a second slot 14 is provided on the side of the second conductive sheet 12. The first slot 13 and the second slot 14 are inserted relative to each other, so that the first conductive sheet 11 and the second conductive sheet 12 cross-stack within the transposition region 103, thereby ensuring that each current path formed by the winding body 100 undergoes at least one cross-stack. That is, in each current path, the current that originally flowed continuously in a single layer is transposed to another layer in the transposition region 103 to continue flowing, thereby changing the spatial position of the current in the thickness direction.

[0033] With this configuration, the first conductive sheet 11 and the second conductive sheet 12 can be stacked in a cross-layered manner by setting the transposition region 103 on the extension path of the winding. The conductive sheets that were originally distributed in layers can physically interchange their positions at the transposition region 103. This allows each current path to undergo at least one layer transformation, thereby making the electromotive force and impedance of each current path tend to be consistent, which is beneficial for uniform current distribution and reduces winding losses and heat dissipation pressure.

[0034] In some embodiments, the winding body 100 has two layers of conductive sheets (i.e., a first conductive sheet 11 and a second conductive sheet 12) stacked along the thickness direction, and the transposition region 103 is provided with at least two, such as five, six, or seven, thereby improving the current sharing effect. A first slot 13 is provided on the side of the first conductive sheet 11, which is a notch formed by recessing from one side edge of the first conductive sheet 11 inwards; correspondingly, a second slot 14 is provided on the side of the second conductive sheet 12, which is a notch formed by recessing from one side edge of the second conductive sheet 12 inwards. The contours and dimensions of the first slot 13 and the second slot 14 can accommodate each other and achieve insertion. When the first conductive sheet 11 and the second conductive sheet 12 are stacked, by inserting the first slot 13 and the second slot 14 relative to each other, the first conductive sheet 11 and the second conductive sheet 12 exchange positions in the transposition region 103, forming a cross-stacked structure of two conductive sheets. Figure 10 As shown, the horizontal axis represents the stacking direction of the first conductive sheet 11 and the second conductive sheet 12, and the vertical axis represents the current density. As the position changes in the stacking direction, the current density of the first conductive sheet 11 and the second conductive sheet 12 changes. However, the current densities of the first current path S1 formed by the first conductive sheet 11 and the second current path S2 formed by the second conductive sheet 12 are close, which can greatly improve the problem of uneven current.

[0035] Multiple transposition regions 103 are evenly distributed at equal intervals along the extension path of the winding body 100. In this way, the electromotive force and impedance on each current path are consistent, the current distribution is more uniform, and the winding loss and heat dissipation pressure are lower.

[0036] To facilitate the insertion of the first conductive sheet 11 and the second conductive sheet 12, the first conductive sheet 11 and the second conductive sheet 12 need to be bent in the transposition region 103. In the transposition region 103, the first conductive sheet 11 has two first conductive portions and one first bent portion 15. The first bent portion 15 is connected between the two first conductive portions. Under the bending action of the first bent portion 15, the two first conductive portions are staggered on the extension path of the winding body so that the two conductive portions have a height difference in the stacking direction. The width of the first bent portion 15 is smaller than the width of the first conductive portion. The first slot is surrounded by the two first conductive portions and the first bent portion 15 so that the first bent portion 15 is inserted into the second slot 14. Accordingly, in the transposition region 103, the second conductive sheet 12 has two second conductive portions and a second bent portion 16. The second bent portion 16 is connected between the two second conductive portions. Under the bending action of the second bent portion 16, the two second conductive portions are staggered on the extension path of the winding body so that the two conductive portions have a height difference in the stacking direction. The width of the second bent portion 16 is smaller than the width of the second conductive portion. The second slot is surrounded by the two second conductive portions and the second bent portion 16 so that the second bent portion 16 is inserted into the first slot 13.

[0037] refer to Figures 3 to 5 When multiple transposition regions 103 are arranged along the extension path of the winding body 100, in any two adjacent transposition regions 103, the two first slots 13 are located on the same side of the first conductive sheet 11, and the two second slots 14 are located on the same side of the second conductive sheet 12. Specifically, for two adjacent transposition regions 103 along the extension path, the first slots 13 on the first conductive sheet 11 are either all on the left side or all on the right side, and the second slots 14 on the second conductive sheet 12 are also either all on the right side or all on the left side, so that the first slots 13 and the second slots 14 are opposite each other. In this way, during processing, it is only necessary to open the first slots 13 or the second slots 14 on the same side, which helps to save processing steps, improve manufacturing efficiency, and product consistency.

[0038] Correspondingly, since the first slot 13 and the first bend 15 are respectively formed on both sides of the first conductive sheet 11, and the second slot 14 and the second bend 16 are respectively formed on both sides of the second conductive sheet 12, in any two adjacent interchange regions 103, the two first bends 15 are located on the same side of the first conductive sheet 11, and the two second bends 16 are located on the same side of the second conductive sheet 12.

[0039] refer to Figures 6 to 8In any two adjacent transposition regions 103, two first slots 13 are located on opposite sides of the first conductive sheet 11, and two second slots 14 are located on opposite sides of the second conductive sheet 12. That is, when the first conductive sheet 11 passes through the first transposition region 103, its first slot 13 is located on its left side; then, in the next transposition region 103 immediately adjacent to that region, the first slot 13 on the first conductive sheet 11 is located on its right side. Correspondingly, the location of the second slot 14 on the second conductive sheet 12 also changes from one side to the other, so that multiple first slots 13 or multiple second slots 14 are alternately arranged on the left and right sides of the winding's extension path. Thus, in two adjacent transposition regions 103, the insertion positions of the first slots 13 and the second slots 14 are located on opposite sides of the first conductive sheet 11 and the second conductive sheet 12, respectively, resulting in more uniform current paths and further improving current sharing.

[0040] Correspondingly, since the first slot 13 and the first bend 15 are respectively formed on both sides of the first conductive sheet 11, and the second slot 14 and the second bend 16 are respectively formed on both sides of the second conductive sheet 12, in any two adjacent interchange regions 103, the two first bends 15 are respectively located on both sides of the first conductive sheet 11, and the two second bends 16 are respectively located on both sides of the second conductive sheet 12.

[0041] In addition, regarding the opening positions of the first slot 13 and the second slot 14, it is also possible that in the four adjacent transposition areas 103, two adjacent first slots 13 are opened on the left side of the first conductive sheet 11, and two adjacent second slots 14 are opened on the right side of the second conductive sheet 12, which can achieve a similar current sharing effect.

[0042] In some preferred embodiments, in the vertical direction of the extension path of the winding body 100, the sum of the dimensions of the first slot 13 and the second slot 14 is greater than or equal to the width of the first conductive piece 11 or the second conductive piece 12. Here, the vertical direction of the extension path refers to the width direction of the first conductive piece 11 or the second conductive piece 12. With regard to the insertion direction of the first slot 13 and the second slot 14 relative to the extension path of the winding body 100, the sum of the slot depths of the first slot 13 and the second slot 14 is greater than or equal to the width of the first conductive piece 11 or the second conductive piece 12. Preferably, the sum of the dimensions of the first slot 13 and the second slot 14 can be 1.0 to 1.2 times the width of the first conductive piece 11 or the second conductive piece 12.

[0043] If the sum of the depths of the first slot 13 and the second slot 14 is less than the width of the first conductive piece 11 or the second conductive piece 12, when the first conductive piece 11 or the second conductive piece 12 is inserted into each other, even after the bottom of the first slot 13 abuts against the bottom of the second slot 14, the first conductive piece 11 or the second conductive piece 12 cannot be completely stacked, which will occupy too much of the width of the winding body 100 and cause a waste of space. When the sum of the depths of the first slot 13 and the second slot 14 is greater than or equal to the width of the first conductive piece 11 or the second conductive piece 12, after the insertion action is completed, the first conductive piece 11 and the second conductive piece 12 can be completely stacked without causing a waste of space. If the sum of the depths of the first slot 13 and the second slot 14 is too large relative to the width of the first conductive piece 11 or the second conductive piece 12, it will excessively reduce the effective conductive cross-sectional area of ​​the transposition region 103, resulting in increased local resistance and concentrated heat generation in the transposition region 103, while also reducing the mechanical strength accordingly.

[0044] Furthermore, to ensure the symmetry of current distribution and mechanical force, the first slot 13 and the second slot 14 have the same depth.

[0045] To avoid overly dense arrangement of the transposition regions 103 and to ensure good mechanical strength and insulation reliability of the winding, the shortest distance between two adjacent transposition regions 103 is greater than or equal to five times the thickness of the first conductive sheet 11 or the second conductive sheet 12. This shortest distance refers to the shortest distance between two adjacent transposition regions 103 along the extension path of the winding body 100. Preferably, the shortest distance between two adjacent transposition regions 103 can be set to eight to ten times the thickness of the first conductive sheet 11 or the second conductive sheet 12.

[0046] To ensure smooth insertion of the first slot 13 and the second slot 14, and to prevent scratches or deformation of the insulating layer outside the conductive sheet during assembly, the slot width of the first slot 13 is greater than or equal to twice the thickness of the first conductive sheet 11, and the slot width of the second slot 14 is greater than or equal to twice the thickness of the second conductive sheet 12. The slot width refers to the opening size formed by the first slot 13 or the second slot 14 along the extension path of the winding body 100, i.e., the distance between the opposite side walls of the first slot 13 or the second slot 14. Preferably, the slot width can be set to 2.5 to 5 times the thickness of the first conductive sheet 11 or the second conductive sheet 12.

[0047] During the assembly of the winding body 100, the first conductive sheet 11 and the second conductive sheet 12 need to be bent to facilitate the insertion of the first slot 13 and the second slot 14. For example... Figure 9As shown, a first slot 13 is formed on the left side of the first conductive sheet 11. The first conductive sheet 11 is bent in two opposite directions along the straight lines of the two opposite sidewalls of the first slot 13, so that the shape of the first conductive sheet 11 is Z-shaped, i.e., the shapes of the two first conductive portions and the first bent portion 15 are Z-shaped. A second slot 14 is formed on the right side of the second conductive sheet 12. The second conductive sheet 12 is bent in two opposite directions along the straight lines of the two opposite sidewalls of the second slot 14, so that the shape of the second conductive sheet 12 is Z-shaped, i.e., the shapes of the two second conductive portions and the second bent portion 16 are Z-shaped. Finally, the opposite first slots 13 and second slots 14 are inserted to allow the first conductive sheet 11 and the second conductive sheet 12 to be interleaved and stacked to form the winding body 100. During the bending process, the bending radius of the conductive sheet is not less than the thickness of the conductive sheet, and the slot width of the first slot 13 or the second slot 14 is not less than twice the bending radius of the conductive sheet, i.e., the slot width of the first slot 13 and the second slot 14 is greater than or equal to twice the thickness of the conductive sheet.

[0048] In some other embodiments, the number of first conductive sheets 11 and second conductive sheets 12 can be two or more, or the winding body may also include a third conductive sheet. For example, the winding body has a total of four layers, forming a pairwise cross-layered structure in the transposition region. Another example is that the winding body has three layers, with the first and second layers cross-layered in the first transposition region, the second and third layers cross-layered in the second transposition region, and the third and first layers cross-layered in the third transposition region.

[0049] This application also provides a power conversion device, which includes the electromagnetic induction device described in any of the above embodiments. With this configuration, the first conductive sheet 11 and the second conductive sheet 12 can be cross-layered by the transposition region 103 provided on the extension path of the winding. The originally layered conductive sheets physically interchange positions at the transposition region 103, ensuring that each current path undergoes at least one layer transformation. This makes the electromotive force and impedance of each current path more consistent, which is beneficial for uniform current distribution and reduces winding losses and heat dissipation pressure.

[0050] In addition, other beneficial effects of this planar transformer can be found in the above description of the windings, which will not be repeated here.

[0051] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0052] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0053] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0054] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0055] It should be understood that the qualifiers “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.

[0056] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. An electromagnetic induction device, characterized in that, The device includes a magnetic core and a winding wound on the magnetic core. The winding includes a winding body and terminals connected to both ends of the winding body. The winding body includes a first conductive sheet and a second conductive sheet stacked on top of each other. The outer surfaces of the first conductive sheet and the second conductive sheet are provided with an insulating layer. The first conductive sheet and the second conductive sheet are connected at the terminals. At least one transposition region is arranged on the extension path of the winding body. In the transposition region, a first slot is provided on the side of the first conductive sheet, and a second slot is provided on the side of the second conductive sheet. The first slot and the second slot are inserted into each other so that the first conductive sheet and the second conductive sheet are cross-stacked.

2. The electromagnetic induction device according to claim 1, characterized in that, Within the transposition area, the first conductive sheet has two first conductive portions misaligned on the extension path of the winding body and a first bent portion connected between the two first conductive portions; the second conductive sheet has two second conductive portions misaligned on the extension path of the winding body and a second bent portion connected between the two second conductive portions; the first bent portion is inserted into the second slot, and the second bent portion is inserted into the first slot.

3. The electromagnetic induction device according to claim 2, characterized in that, The number of transposition regions is set to two or more.

4. The electromagnetic induction device according to claim 3, characterized in that, The transposition areas are evenly distributed along the extension path of the winding body.

5. The electromagnetic induction device according to claim 3, characterized in that, In any two adjacent transposition regions, the two first slots are located on the same side of the first conductive sheet, the two first bends are located on the same side of the first conductive sheet, the two second slots are located on the same side of the second conductive sheet, and the two second bends are located on the same side of the second conductive sheet.

6. The electromagnetic induction device according to claim 3, characterized in that, In any two adjacent transposition regions, the two first slots are located on both sides of the first conductive sheet, the two first bends are located on both sides of the first conductive sheet, the two second slots are located on both sides of the second conductive sheet, and the two second bends are located on both sides of the second conductive sheet.

7. The electromagnetic induction device according to claim 1, characterized in that, In the vertical direction of the extension path of the winding body, the sum of the slot depths of the first slot and the second slot is greater than or equal to the width of the first conductive sheet or the second conductive sheet.

8. The electromagnetic induction device according to claim 7, characterized in that, The first slot and the second slot have the same depth.

9. The electromagnetic induction device according to claim 1, characterized in that, The shortest distance between two adjacent transposition regions along the extension path of the winding body is greater than or equal to 5 times the thickness of the first conductive sheet or the second conductive sheet.

10. The electromagnetic induction device according to claim 1, characterized in that, The first slot has a slot width on the extension path of the winding body that is greater than or equal to twice the thickness of the first conductive sheet; the second slot has a slot width on the extension path of the winding body that is greater than or equal to twice the thickness of the second conductive sheet.

11. A power conversion device, characterized in that, It includes the electromagnetic induction device as described in any one of claims 1-10.

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