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 n layers of conductive sheets arranged in a stack, and an insulating layer arranged between two adjacent layers of the conductive sheets, n is an integer greater than or equal to 2, and the n layers of the conductive sheets are in communication at the terminal; at least one transposition region is arranged on the winding main body, in each transposition region, each layer of the conductive sheet is disconnected to form a first conductor part and a second conductor part which are insulated from each other, and the first conductor part of each layer of the conductive sheet is electrically connected to the second conductor part of another layer of the conductive sheet in a one-to-one manner, so that each current path of the winding main body passes through at least two layers of the conductive sheets. 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 around the magnetic core; The winding includes a winding body and terminals connected to both ends of the winding body. The winding body includes n layers of conductive sheets stacked together, and an insulating layer located between two adjacent conductive sheets, where n is an integer greater than or equal to 2. The n conductive sheets are connected at the terminals. At least one transposition region is provided on the winding body. In each transposition region, each layer of conductive sheet is disconnected to form a first conductor portion and a second conductor portion that are mutually insulated. The first conductor portion of each layer of conductive sheet is electrically connected one-to-one with the second conductor portion of another layer of conductive sheet, so that each current path of the winding body passes through at least two layers of conductive sheet.

[0005] Optionally, n-1 transposition regions are arranged along the extension path of the winding body so that each current path of the winding body passes through n layers of the conductive sheets.

[0006] Optionally, the n-1 transposition regions are evenly distributed at equal intervals along the extension path of the winding body.

[0007] Optionally, in each of the transposition regions, the first conductor portion is provided with a first protrusion on the side near the second conductor portion, and the second conductor portion is provided with a second protrusion on the side near the first conductor portion. The first protrusion of each layer of conductive sheet overlaps one-to-one with the second protrusion of another layer of conductive sheet in the thickness direction of the winding body, and is electrically connected through a conductive element that penetrates the insulating layer.

[0008] Optionally, the conductive element is configured as a column, and the insulating layer, the first protrusion, and the second protrusion are all provided with through holes for the conductive element to pass through and connect.

[0009] Optionally, within the same transposition region, the first protrusion and the second protrusion located on the same conductive sheet are arranged at intervals in the vertical direction along the extension path of the winding body.

[0010] Optionally, within the same transposition region, the number of at least one of the first protrusion and the second protrusion located on the same conductive sheet is set to two or more.

[0011] Optionally, within the same transposition region, the first protrusion and the second protrusion located on the same conductive sheet are staggered in the vertical direction of the extension path of the winding body.

[0012] Optionally, the first protrusion and the second protrusion are electrically connected by at least two of the conductive elements.

[0013] Optionally, in each of the transposition regions, the first conductor portion of the (n-1)th conductive sheet is electrically connected to the second conductor portion of the nth conductive sheet, and the second conductor portion of the first conductive sheet is electrically connected to the second conductor portion of the nth conductive sheet.

[0014] Optionally, the insulating layer is bonded between two adjacent conductive sheets using insulating adhesive or high-temperature tape; or, potting compound is filled between two adjacent conductive sheets to form the insulating layer.

[0015] Optionally, the conductive sheet is configured as three layers, and the transposition region is configured as two; in the same transposition region, each conductive sheet has a first protrusion and a second protrusion, the three first protrusions are misaligned in the thickness direction, and the three second protrusions are misaligned in the thickness direction; the first protrusion of the conductive sheet of the first layer is aligned with the second protrusion of the conductive sheet of the third layer in the thickness direction and connected by the conductive element, the first protrusion of the conductive sheet of the second layer is aligned with the second protrusion of the conductive sheet of the first layer in the thickness direction and connected by the conductive element, and the first protrusion of the conductive sheet of the third layer is aligned with the second protrusion of the conductive sheet of the second layer in the thickness direction and connected by the conductive element.

[0016] A power conversion device includes an electromagnetic induction device as described in any of the preceding claims.

[0017] The electromagnetic induction device and power conversion device provided in this application can cross-connect each current path through at least two layers of conductive sheets by setting transposition areas on the extension path of the winding, thereby making the electromotive force and impedance of each current path tend to be consistent, which is beneficial to uniform current distribution and reduces winding loss and heat dissipation pressure. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is a schematic diagram illustrating the installation of the windings for some embodiments of this application.

[0020] Figure 2 A front view of the winding shown for some embodiments of this application.

[0021] Figure 3 This is a partial cross-sectional view of the winding shown for some embodiments of this application.

[0022] Figure 4 This is a schematic diagram of the structure of the first conductive sheet shown in the first embodiment of this application.

[0023] Figure 5 This is a schematic diagram of the structure of the second conductive sheet shown in the first embodiment of this application.

[0024] Figure 6 This is a schematic diagram of the structure of the third conductive sheet shown in the first embodiment of this application.

[0025] Figure 7 This is a cross-sectional view of the winding at position AA, as shown in the first embodiment of this application.

[0026] Figure 8 This is a schematic diagram of the structure of the conductive sheet shown in the second embodiment of this application.

[0027] Figure 9 This is a schematic diagram of the structure of the conductive sheet shown in the third embodiment of this application.

[0028] Figure 10 This is a schematic diagram of the structure of the conductive sheet shown in the fourth embodiment of this application.

[0029] Figure 11 This is a schematic diagram of the structure of the conductive sheet shown in the fifth embodiment of this application.

[0030] Figure 12 The diagram shows the current density distribution of each conductive layer in some embodiments of this application.

[0031] Explanation of reference numerals in the attached drawings: 100, winding body; 110, terminal; 101, current input terminal; 102, current output terminal; 103, transposition area; 200, magnetic core; 1, conductive sheet; 11, first conductor section; 12, second conductor section; 13, first protrusion; 14, second protrusion; 2, insulating layer; 3, conductive element. Detailed Implementation

[0032] 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.

[0033] like Figures 1-12 As shown, this application provides an electromagnetic induction device, including a magnetic core 200 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.

[0034] The winding includes a winding body 100 and terminals 110 connected to both ends of the winding body 100. The winding body 100 has n layers of conductive sheets 1 stacked along its thickness direction, and an insulating layer 2 located between adjacent conductive sheets 1. Here, n is an integer greater than or equal to 2. The conductive sheets 1 can be made of conductive thin sheets, such as copper sheets, aluminum sheets, or other metal sheets. The insulating layer 2 is used to maintain electrical insulation between adjacent conductive sheets 1 and can be fixed to the conductive sheets 1 by means of bonding, potting, or high-temperature tape. For example, the insulating layer 2 can be made of materials such as epoxy board or FR4.

[0035] The n conductive sheets 1 extend to both ends of the winding body 100, and are connected at the two terminals 110, so that the two ends of the n conductive sheets 1 are electrically connected, and the n conductive sheets 1 are connected in parallel to form the winding body 100. Specifically, the terminals 110 and the winding body 100 are integrally formed, that is, both the terminals 110 and the winding body 100 are composed of conductive sheets 1 and insulating sheets. Preferably, each of the two terminals 110 has a through hole, and a current input terminal 101 and a current output terminal 102 are respectively inserted into the through holes of the two terminals 110, respectively connecting the two ends of the n conductive sheets. For example, the current input terminal 101 and the current output terminal 102 are set as terminals.

[0036] 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 winding body 100 from the current input terminal 101 to the current output terminal 102, and can be a straight segment, an arc segment, or part of a closed loop path. Within each transposition region 103, each layer of conductive sheet 1 is broken to form a first conductor portion 11 and a second conductor portion 12 that are mutually insulated. That is, the originally continuous conductive sheet 1 is divided into two separate and insulated parts in the transposition region 103. The first conductor portion 11 is located on one side of the transposition region 103 along the extension path, and the second conductor portion 12 is located on the other side. Furthermore, the first conductor portion 11 of each layer of conductive sheet 1 is electrically connected one-to-one with the second conductor portion 12 of another layer of conductive sheet 1, thereby forming cross connections between the layers of conductive sheet 1, so that each current path formed by the winding body 100 passes through at least two layers of conductive sheet 1. That is, in each current path, the current that originally flowed continuously in a single conductive sheet 1 is transposed to another conductive sheet 1 in the transposition region 103 and continues to flow, thereby changing the spatial position of the current in the thickness direction.

[0037] It should be noted that the thickness direction in this application refers to the direction in which the conductive sheet 1 and the insulating layer 2 are stacked layer by layer, i.e., as shown in the figure. Figure 3 and Figure 7 The vertical direction is shown. The n-layer conductive sheets 1 are sequentially arranged along the thickness direction as layer 1, layer 2... layer n. The positional relationship between layers 1 to n can be, but is not limited to, their distance from the magnetic core 200. Due to the different positions of different conductive sheets 1 relative to the magnetic core 200, the magnetic field strength at their respective locations varies, resulting in different electromotive forces and impedances for each layer of conductive sheets 1. The conductive sheets 1 can be set to 2-8 layers, meaning the specific value of n can be 2, 3, 4, 5, 6, 7, or 8. For example, when n=3, two transposition regions 103 are set on the extension path of the winding, allowing the first current path S1 to sequentially pass through layers 1, 2, and 3; the second current path S2 to sequentially pass through layers 2, 3, and 1; and the third current path S3 to sequentially pass through layers 3, 1, and 2. Figure 12 As shown, the horizontal axis represents the stacking direction of multiple conductive sheets 1, and the vertical axis represents the current density. As the position of the conductive sheet 1 changes in the stacking direction, the current density of the conductive sheet 1 also changes. Furthermore, the current densities of the first current path S1, the second current path S2, and the third current path S3 are close, which can significantly improve the problem of uneven current distribution.

[0038] With this configuration, by cross-connecting the transposition areas 103 set on the extension path of the winding, each current path can pass through at least two layers of conductive sheets 1, 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.

[0039] In a specific design, the disconnection of the conductive sheet 1 within the transposition region 103 can be achieved through physical etching, punching, or milling. For example, when using copper sheet as the conductive sheet 1, a portion of the copper can be etched away using chemical liquid acid milling, thereby separating the first conductor portion 11 and the second conductor portion 12. The gap width maintained between the first conductor portion 11 and the second conductor portion 12 should be sufficient to ensure the insulation withstand voltage requirements between them; the specific gap width can be set according to the actual operating voltage.

[0040] Regarding the connection sequence of each conductive sheet 1, within each transposition region 103, the first conductor portion 11 of the first conductive sheet 1 is electrically connected to the second conductor portion 12 of the second conductive sheet 1, ..., the first conductor portion 11 of the (n-1)th conductive sheet 1 is electrically connected to the second conductor portion 12 of the nth conductive sheet 1, and the second conductor portion 12 of the first conductive sheet 1 is electrically connected to the second conductor portion 12 of the nth conductive sheet 1. This connection sequence allows the current to transpose layer by layer from the first layer to the nth layer, and then directly from the nth layer back to the first layer. Most of the transposition is between adjacent layers, resulting in shorter transposition intervals and helping to save material costs.

[0041] In some preferred embodiments, to further improve current sharing, n-1 transposition regions 103 are arranged along the extension path of the winding body 100. By configuring n-1 transposition regions 103, each current path can pass through all n layers of conductive sheets 1 after sequential transposition through these n-1 transposition regions 103. For example, as Figure 2 As shown, for a winding with n=3, setting two transposition regions 103 allows each current path to sequentially pass through the upper, middle, and lower layers, achieving current sharing across all current paths. Increasing the number of transposition regions 103 increases the number of times the conductive sheet 1 is disconnected and the number of electrical connections between the conductive sheets 1 layers, making the structure more complex, increasing manufacturing costs, and decreasing stability. By setting n-1 transposition regions 103, each current path can flow through all n layers of conductive sheets 1, while reducing structural complexity and manufacturing costs.

[0042] Among them, n-1 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.

[0043] In some embodiments, within each transposition region 103, a first protrusion 13 and a second protrusion 14 are respectively provided on the opposing sides of the first conductor portion 11 and the second conductor portion 12. Specifically, the first conductor portion 11 has a first protrusion 13 protruding from the side closest to the first conductor portion 11, and the second conductor portion 12 has a second protrusion 14 protruding from the side closest to the second conductor portion 12. The first protrusion 13 of each conductive sheet 1 overlaps one-to-one with the second protrusion 14 of another conductive sheet 1 in the thickness direction of the winding body 100. That is, the first protrusion 13 of each conductive sheet 1 does not overlap with the second protrusion 14 of the same layer or the first protrusion 13 of other layers, but is aligned with a second protrusion 14 of the target layer in the thickness direction. A conductive member 3 is provided between the overlapping first protrusion 13 and the second protrusion 14, the conductive member 3 penetrates the insulating layer 2, and electrically connects the overlapping first protrusion 13 and the second protrusion 14. The conductive element 3 can be made of copper, aluminum or other conductive materials, for example, the conductive element 3 is a copper pillar.

[0044] Through the cooperation of the above-mentioned protrusions (first protrusion 13 and second protrusion 14) with the conductive element 3, a reliable and unique cross-electrical connection between different conductor layers is achieved. The conductive element 3 penetrates the insulating layer 2, fixing and electrically connecting the overlapping first protrusion 13 and second protrusion 14. This not only results in a large conductive cross-sectional area and low contact resistance, but also helps to improve the structural compactness and electrical connection stability of the transposition region 103.

[0045] The conductive element 3 can be columnar, and through holes for the conductive element 3 to pass through are provided on the insulating layer 2, the first protrusion 13, and the second protrusion 14. Specifically, the cross-section of the column can be circular, square, or other shapes to accommodate the opening shape of the through holes. The through holes can be formed by mechanical drilling or laser drilling, and the hole diameter is determined according to the diameter of the conductive element 3 and the welding process, usually slightly larger than the outer diameter of the conductive element 3 to provide assembly clearance. During the manufacturing process, the conductive sheets 1 and the insulating layer 2 are first stacked, aligned, and fixed as a whole. Then, through holes are drilled at the pre-designed overlapping positions of the first protrusion 13 and the second protrusion 14, so that all the first protrusion 13, the insulating layer 2, and the second protrusion 14 that need to be connected have coaxial through holes. Next, the columnar conductive element 3 is inserted into the through holes, and a strong electrical and mechanical connection is formed between the first protrusion 13 and the second protrusion 14 by welding, pressing, or bonding.

[0046] By cooperating with the columnar conductive element 3 and the through hole, the positioning of each conductive sheet 1 and insulating layer 2 can be achieved, improving the stable connection between the conductive sheet 1 and the insulating layer 2. Moreover, the conductive element 3 and the conductive sheet 1 form a large-area contact, which can carry a high current density and effectively reduce connection resistance and local heat generation.

[0047] Within the same transposition region 103, the first protrusion 13 and the second protrusion 14 located on the same conductive sheet 1 are arranged at intervals along the vertical direction of the extension path of the winding body 100. The vertical direction of the extension path refers to the direction perpendicular to the current path in the plane where the conductive sheet 1 is located, i.e., the width direction. In this way, the arrangement direction of the first protrusion 13 and the second protrusion 14 within the same transposition region 103 is perpendicular to the arrangement direction of the first conductor portion 11 and the second conductor portion 12, which can reduce the risk of partial discharge and short circuit between the first protrusion 13 and the second protrusion 14.

[0048] Specifically, such as Figure 4-5 As shown, for the three-layer conductive sheet 1, the upper part of the left portion (first conductor portion 11) of the first layer protrudes to form a first protrusion 13, and the lower part of the right portion (second conductor portion 12) protrudes to form a first protrusion 13; the middle of the left portion of the second layer protrudes to form a first protrusion 13, and the upper part of the right portion protrudes to form a second protrusion 14; the lower part of the left portion of the third layer protrudes to form a first protrusion 13, and the middle of the right portion protrudes to form a second protrusion 14. In this way, the first protrusion 13 and the second protrusion 14 of each conductive sheet 1 are located at different positions (i.e., different positions in the width direction), spaced apart from each other, effectively preventing short circuits within the same layer. Simultaneously, this staggered arrangement, combined with the overlapping and matching of the first protrusion 13 and the second protrusion 14 of different conductive sheets 1 in the thickness direction, ensures a unique correspondence between the layers.

[0049] like Figure 3 and Figure 11 As shown, in some preferred embodiments, to further enhance the reliability and current-carrying capacity of the electrical connection, at least one of the first protrusion 13 and the second protrusion 14 located on the same conductive sheet 1 is provided with two or more within the same transposition region 103. That is, multiple first protrusions 13 are provided on the first conductor portion 11, and multiple second protrusions 14 are provided on the second conductor portion 12, so that the first conductor portion 11 and the second conductor portion 12 of different layers are connected by multiple first protrusions 13 and multiple second protrusions, thereby increasing the number of connection points. By using a multi-point connection method, the current density at each connection point can be reduced, contact resistance and localized heating can be decreased, and the risk of the entire transposition failing due to the failure of a single connection point can be avoided.

[0050] In the same transposition region 103, when multiple first protrusions 13 and multiple second protrusions 14 are provided on the same conductive sheet 1, the multiple first protrusions 13 and multiple second protrusions 14 are staggered in the vertical direction of the extension path of the winding body 100. In this way, the spacing between two adjacent first protrusions 13 / second protrusions 14 can be increased, making the connection point between the corresponding first conductor portion 11 and second conductor portion 12 more stable and uniform, which is beneficial to improving current uniformity.

[0051] like Figure 9-11 As shown, in some preferred embodiments, the corresponding first protrusion 13 and second protrusion 14 are electrically connected by at least two conductive elements 3. That is, two or more through holes are drilled in the overlapping first protrusion 13 and second protrusion 14, and a corresponding number of conductive elements 3 are inserted, so that multiple conductive elements 3 are simultaneously electrically connected to the first protrusion 13 and the second protrusion 14. In this way, the multiple conductive elements 3 are connected in parallel, sharing the total current on the node, which can simultaneously improve conductivity and mechanical connection strength.

[0052] This application also provides a power conversion device, which includes the electromagnetic induction device in any of the above embodiments. With this configuration, by cross-connecting the transposition regions 103 provided on the extension path of the winding, each current path can pass through at least two layers of conductive sheets 1, 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.

[0053] In addition, other beneficial effects brought about by this electromagnetic induction device are described in the above description of the winding, and will not be repeated here.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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, Includes a magnetic core and a winding wound around the magnetic core; The winding includes a winding body and terminals connected to both ends of the winding body. The winding body includes n layers of conductive sheets stacked together, and an insulating layer located between two adjacent conductive sheets, where n is an integer greater than or equal to 2. The n conductive sheets are connected at the terminals. At least one transposition region is provided on the winding body. In each transposition region, each layer of conductive sheet is disconnected to form a first conductor portion and a second conductor portion that are mutually insulated. The first conductor portion of each layer of conductive sheet is electrically connected one-to-one with the second conductor portion of another layer of conductive sheet, so that each current path of the winding body passes through at least two layers of conductive sheet.

2. The electromagnetic induction device according to claim 1, characterized in that, n-1 transposition regions are arranged along the extension path of the winding body so that each current path of the winding body passes through n layers of the conductive sheet.

3. The electromagnetic induction device according to claim 1, characterized in that, The n-1 transposition regions are evenly distributed at equal intervals along the extension path of the winding body.

4. The electromagnetic induction device according to claim 1, characterized in that, In each transposition region, the first conductor portion is provided with a first protrusion on the side near the second conductor portion, and the second conductor portion is provided with a second protrusion on the side near the first conductor portion. The first protrusion of each layer of conductive sheet overlaps one-to-one with the second protrusion of another layer of conductive sheet in the thickness direction of the winding body, and is electrically connected through a conductive element that penetrates the insulating layer.

5. The electromagnetic induction device according to claim 4, characterized in that, The conductive element is configured as a column, and the insulating layer, the first protrusion, and the second protrusion are all provided with through holes for the conductive element to pass through and connect.

6. The electromagnetic induction device according to claim 4, characterized in that, Within the same transposition region, the first protrusion and the second protrusion located on the same conductive sheet are arranged at intervals in the vertical direction of the extension path of the winding body.

7. The electromagnetic induction device according to claim 4, characterized in that, Within the same transposition region, the number of at least one of the first protrusion and the second protrusion located on the same conductive sheet is set to two or more.

8. The electromagnetic induction device according to claim 7, characterized in that, Within the same transposition area, the first protrusion and the second protrusion located on the same conductive sheet are staggered in the vertical direction of the extension path of the winding body.

9. The electromagnetic induction device according to claim 4, characterized in that, The first protrusion and the second protrusion are electrically connected by at least two of the conductive elements.

10. The electromagnetic induction device according to claim 1, characterized in that, In each of the transposition regions, the first conductor portion of the (n-1)th conductive sheet is electrically connected to the second conductor portion of the nth conductive sheet, and the second conductor portion of the first conductive sheet is electrically connected to the second conductor portion of the nth conductive sheet.

11. The electromagnetic induction device according to claim 1, characterized in that, The insulating layer is bonded between two adjacent conductive sheets by insulating adhesive or high-temperature tape; or, potting compound is filled between two adjacent conductive sheets to form the insulating layer.

12. The electromagnetic induction device according to claim 4, characterized in that, The conductive sheet is configured as three layers, and the transposition region is configured as two. In the same transposition region, each conductive sheet has a first protrusion and a second protrusion. The three first protrusions are misaligned in the thickness direction, and the three second protrusions are misaligned in the thickness direction. The first protrusion of the conductive sheet of the first layer is aligned with the second protrusion of the conductive sheet of the third layer in the thickness direction and connected by the conductive element. The first protrusion of the conductive sheet of the second layer is aligned with the second protrusion of the conductive sheet of the first layer in the thickness direction and connected by the conductive element. The first protrusion of the conductive sheet of the third layer is aligned with the second protrusion of the conductive sheet of the second layer in the thickness direction and connected by the conductive element.

13. A power conversion device, characterized in that, It includes the electromagnetic induction device as described in any one of claims 1-12.

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