Common mode inductor

Abstract

The embodiment of the invention provides a common-mode inductor, and relates to the technical field of common-mode inductors, the common-mode inductor comprises a magnetic core assembly, the magnetic core assembly comprises a shell and a magnetic ring, the shell is provided with an annular containing cavity, a magnetic core is arranged in the containing cavity, the circumcircle of the cross section contour of the magnetic ring is circular, the magnetic ring comprises a first magnetic core and a second magnetic core, and the first magnetic core and the second magnetic core are arranged in the containing cavity. The magnetic conductivity of the first magnetic cores is larger than that of the second magnetic cores, the second magnetic cores are arranged on the upper sides and the lower sides of the first magnetic cores, or the first magnetic cores are arranged on the upper sides and the lower sides of the second magnetic cores. According to the embodiment of the invention, the internal space of the circular coil can be fully utilized, and a higher space utilization rate is realized; meanwhile, the magnetic ring is formed by overlapping the first magnetic core and the second magnetic core which are different in magnetic conductivity, mutual complementation can be achieved by utilizing the characteristic that different materials are different in magnetic conductivity under different frequencies, and the EMI filtering effect in a wider frequency range is achieved.

Description

Technical Field

[0001] This application relates to the technical field of common mode inductors, and particularly to a common mode inductor and a manufacturing method thereof. Background Art

[0002] With the development of society and technology, power electronic devices require components to develop towards integration, miniaturization, modularization, and high power density.

[0003] Currently, the existing common mode inductors face problems such as it being difficult for low magnetic permeability magnetic cores to reach the rated inductance, and high magnetic permeability magnetic cores having severe attenuation in the high-frequency working range. At the same time, to meet the increasing power requirements in the working circuit, the copper wire used for the coil also needs to use a larger wire diameter to meet a larger rated current. However, the copper wire with an increased wire diameter makes the operations of winding the coil and manufacturing the magnetic components (i.e., magnetic elements) more complex, and also further increases the requirements for the production process.

[0004] The integration, miniaturization, modularization, and high power density of power electronic devices require components to be small in size while also meeting the requirements for temperature rise limitation and heat dissipation efficiency of the components. The current mainstream heat dissipation method is to design a contoured groove structure for the components at the corresponding position on the casing of the electronic device, then install the components on the PCB, and after covering the casing, the components are exactly embedded in the contoured groove. Subsequently, the contoured groove is filled with thermal conductive glue to fill the gap between the components and the casing, so that the heat of the components is efficiently conducted to the casing, and then the casing is further cooled by water cooling or air cooling. This design scheme has high heat dissipation efficiency. However, since the size and layout gap depth of the internal components of the electronic device need to be customized and designed so that the contoured grooves of the components and the casing can match one by one, it leads to an extended design cycle of the electronic device, poorer versatility of the components, and increased difficulty in changing the PCB circuit, which is a burden for the upgrading of electronic devices. Summary of the Invention

[0005] This application aims to solve at least one of the technical problems existing in the prior art. For this purpose, this application proposes a common mode inductor, which is conducive to realizing the miniaturization of magnetic components and can enable the common mode inductor to have an EMI filtering effect in a wider frequency range.

[0006] An embodiment of this application provides a common mode inductor, including:

[0007] A magnetic core assembly, including a casing and a magnetic ring. The casing has an annular accommodation cavity, the magnetic core is arranged in the accommodation cavity, the circumscribed circle of the cross-sectional profile of the magnetic ring is circular, the magnetic ring includes a first magnetic core and a second magnetic core, the magnetic permeability of the first magnetic core is greater than that of the second magnetic core, and the second magnetic core is arranged on both the upper and lower sides of the first magnetic core or the first magnetic core is arranged on both the upper and lower sides of the second magnetic core.

[0008] Further, the first magnetic core is made of nanocrystalline strip; and / or, the second magnetic core is made of ferrite material.

[0009] Further, the magnetic ring includes second magnetic cores, a first magnetic core, and second magnetic cores which are stacked in sequence, and a cross-sectional area of the first magnetic core is larger than that of the second magnetic core; or, the magnetic ring includes a first magnetic core, second magnetic cores, and a first magnetic core which are stacked in sequence, and a cross-sectional area of the second magnetic core is larger than that of the first magnetic core.

[0010] Further, the housing includes a protective housing body and partition parts. There are a plurality of the partition parts, and the plurality of partition parts are spaced on an outer periphery of the protective housing body, and a coil winding is arranged between two adjacent partition parts.

[0011] Further, a base is further included, and the protective housing body is mounted on the base. Wherein, the base is provided with a positioning protrusion, one side of the partition part extends towards the base, and a positioning groove matching with the positioning protrusion is formed in the partition part.

[0012] Further, the base includes a bottom plate, an outer edge, an inner edge, a first reinforcing rib, and a second reinforcing rib. The bottom plate is annular, the outer edge and the inner edge are spaced on the bottom plate, the first reinforcing rib is arranged on the bottom plate, one end of the first reinforcing rib is connected to the outer edge, and the other end of the first reinforcing rib extends towards the inner edge in a radial direction; the second reinforcing rib is arranged on the bottom plate, one end of the second reinforcing rib is connected to the inner edge, and the other end of the second reinforcing rib extends towards the outer edge in a radial direction.

[0013] Further, along a direction from the inner edge to the outer edge, a height of the first reinforcing rib gradually increases, and / or a height of the second reinforcing rib gradually decreases.

[0014] Further, the first reinforcing rib and the second reinforcing rib are arranged in a staggered manner in a circumferential direction of the bottom plate.

[0015] Further, a heat conducting member is further included, and the heat conducting member is arranged on a side of the coil winding away from the base. The heat conducting member includes an end cover and an extension part, one end of the extension part is connected to the end cover, and the other end of the extension part extends towards the coil winding.

[0016] Further, an insulating connection layer is arranged between the first magnetic core and the second magnetic core.

[0017] It can be seen from the above technical solutions that the embodiments of the present application have at least the following beneficial effects:

[0018] In the common-mode inductor provided by the embodiment of the present application, the magnetic ring is composed of a first magnetic core, a second magnetic core and a first magnetic core stacked, or composed of a second magnetic core, a first magnetic core and a second magnetic core stacked. That is, the magnetic ring is a structure formed by three layers of magnetic rings stacked on each other, which can make full use of the internal space of the circular coil to achieve higher space utilization. In other words, on the premise of the same magnetic permeability, the volume of the magnetic ring can be effectively reduced to achieve miniaturized design. At the same time, the magnetic ring is formed by stacking a first magnetic core and a second magnetic core with different magnetic permeabilities, and the characteristics of different materials with different magnetic permeabilities at different frequencies can be used to complement each other to achieve EMI filtering effects in a wider frequency range. Brief Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 Schematic structural diagram of a common-mode inductor provided by an embodiment of the present application;

[0021] Figure 2 Exploded structural diagram of a common-mode inductor according to an embodiment of the present application;

[0022] Figure 3 Schematic structural diagram of a magnetic ring according to an embodiment of the present application;

[0023] Figure 4 Schematic structural diagram of a magnetic ring according to another embodiment of the present application;

[0024] Figure 5 Schematic diagram of the cooperation of the magnetic core assembly, the coil winding and the base in a common-mode inductor according to an embodiment of the present application.

[0025] Reference Signs:

[0026] 100, magnetic core assembly; 111, upper shell; 112, lower shell; 113, accommodation cavity; 114, partition; 1141, positioning groove; 120, magnetic ring; 121, first magnetic core; 122, second magnetic core;

[0027] 200, coil winding;

[0028] 300, base; 310, bottom plate; 320, positioning protrusion; 330, outer edge; 340, inner edge; 350, first reinforcing rib; 360, second reinforcing rib;

[0029] 400, heat conducting member. Detailed Embodiments

[0030] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0031] See Figure 1 As shown, an embodiment of the present application discloses a common-mode inductor, which includes a magnetic core assembly 100. Specifically, the magnetic core assembly 100 includes a housing and a magnetic ring 120. The housing has an annular accommodation cavity 113, and the magnetic core is disposed in the accommodation cavity 113. The circumscribed circle of the cross-sectional contour of the magnetic ring 120 is circular. The magnetic ring 120 includes a first magnetic core 121 and a second magnetic core 122. The magnetic permeability of the first magnetic core 121 is greater than that of the second magnetic core 122. The second magnetic core 122 is disposed on both the upper and lower sides of the first magnetic core 121, or the first magnetic core 121 is disposed on both the upper and lower sides of the second magnetic core 122.

[0032] In the common-mode inductor provided by the embodiment of the present application, the magnetic ring 120 is composed of the first magnetic core 121, the second magnetic core 122, and the first magnetic core 121 stacked, or composed of the second magnetic core 122, the first magnetic core 121, and the second magnetic core 122 stacked. That is, the magnetic ring 120 is a structure formed by three magnetic rings 120 stacked on each other, which can make full use of the internal space of the circular coil to achieve higher space utilization. In other words, on the premise of the same magnetic permeability, the volume of the magnetic ring 120 can be effectively reduced to achieve miniaturized design; at the same time, the magnetic ring 120 is formed by stacking the first magnetic core 121 and the second magnetic core 122 with different magnetic permeabilities, and the characteristics of different materials having different magnetic permeabilities at different frequencies can be used to complement each other to achieve an EMI filtering effect in a wider frequency range.

[0033] See Figure 3 and Figure 4 , compared with the direction of arranging different magnetic cores at intervals in the radial direction, the first magnetic core 121 and the second magnetic core 122 in the embodiment of the present application are arranged in an upper and lower stacked manner, and the stacking method is first magnetic core 121 - second magnetic core 122 - first magnetic core 121 or second magnetic core 122 - first magnetic core 121 - second magnetic core 122, which can reduce the magnetic permeability difference at each position of the cross-sectional contour of the magnetic ring 120, thereby improving the uniformity of the magnetic permeability in the circumferential direction of the cross-section of the magnetic ring 120.

[0034] In some embodiments of the present application, the first magnetic core 121 is made of nanocrystalline strip. Among them, the nanocrystalline strip has a high initial magnetic permeability, which can ensure that the magnetic ring 120 has a large magnetic permeability in the low-frequency working section.

[0035] In some embodiments of the present application, the second magnetic core 122 is made of ferrite material. Among them, the initial magnetic permeability of the ferrite material is lower than that of the nanocrystalline ribbon, but in the high-frequency working section, the magnetic permeability of the ferrite material decays less.

[0036] In a possible implementation manner, the first magnetic core 121 is made of nanocrystalline ribbon, and the second magnetic core 122 is made of ferrite material. By laminating the magnetic cores 121 and 122 with two different magnetic permeabilities to obtain the magnetic ring 120, compared with the existing nanocrystalline ribbon magnetic core solution, within the same diameter circle, the cross-sectional area of the magnetic ring 120 in this embodiment is larger, and the power density of the magnetic ring 120 can be improved.

[0037] Exemplarily, if the cross-section of the existing nanocrystalline ribbon magnetic core is designed as a square with the largest area within a circle, the cross-sectional area of the magnetic ring 120 in this embodiment can be increased by up to 15% at most, which can significantly improve the power density of the magnetic component.

[0038] In the above implementation manner, the initial magnetic permeability of the nanocrystalline ribbon is high, but the magnetic permeability decays greatly in the high-frequency working section. The initial magnetic permeability of the ferrite is low, but the magnetic permeability decays less in the high-frequency working section. Therefore, by compounding and laminating the two materials, the magnetic core assembly 100 can work in a wider frequency range to meet the EMI filtering effect.

[0039] It should be understood that although the initial magnetic permeability of the nanocrystalline ribbon is high, due to its material and production process characteristics, the cross-section of the produced magnetic ring 120 can only be rectangular. And being limited within the same diameter circle is for the consideration of coil winding. If the wire diameter is larger, the bending radius of the coil is larger. Therefore, in the embodiments of the present application, the coil winding shape is designed as a perfect circle, so that the bending radius required for winding most wire diameters can be satisfied.

[0040] In a possible implementation manner, referring to Figure 3 , the magnetic ring 120 includes a second magnetic core 122, a first magnetic core 121, and a second magnetic core 122 that are sequentially laminated, and the cross-sectional area of the first magnetic core 121 is larger than that of the second magnetic core 122.

[0041] In a possible implementation manner, referring to Figure 4 , the magnetic ring 120 includes a first magnetic core 121, a second magnetic core 122, and a first magnetic core 121 that are sequentially laminated, and the cross-sectional area of the second magnetic core 122 is larger than that of the first magnetic core 121.

[0042] In some embodiments of the present application, referring to Figure 1 and Figure 2, the housing includes a protective housing body and a plurality of partition portions 114. There are multiple partition portions 114, which are spaced apart on the outer periphery of the protective housing body, and a coil winding 200 is provided between two adjacent partition portions 114. Among them, the partition portion 114 protrudes from the surface of the protective housing body. Therefore, the partition portion 114 can separate two adjacent coil windings 200, ensuring the safety distance between the coil windings 200 and also positioning the relative positions of the coil windings 200.

[0043] In a possible implementation manner, referring to Figure 1 and Figure 2 , four partition portions 114 are spaced apart on the protective housing body, and a coil winding 200 is provided between any two adjacent partition portions 114. That is, the common mode inductance coil in this embodiment is a four-phase common mode inductance.

[0044] It should be understood that in other implementation manners, the number of partition portions 114 can be adjusted accordingly according to actual needs. Exemplarily, the number of partition portions 114 can also be 2 or 3.

[0045] In this embodiment, referring to Figure 2 , the protective housing body includes an upper housing 111 and a lower housing 112. The upper housing 111 and the lower housing 112 cooperate with each other and enclose an accommodation cavity 113. Among them, a magnetic ring 120 is arranged in the accommodation cavity 113.

[0046] In some embodiments of the present application, referring to Figure 1 , Figure 2 and Figure 5 , the common mode inductance further includes a base 300. The protective housing body is installed on the base 300. Among them, the base 300 is provided with a positioning protrusion 320. The partition portion 114 extends toward the base 300, and the partition portion 114 is formed with a positioning groove 1141 that cooperates with the positioning protrusion 320. By nesting and matching the positioning groove 1141 and the positioning protrusion 320, the magnetic core assembly 100 can be positioned at a position centered relative to the base 300, thereby ensuring the consistency of the finished product production.

[0047] It should be understood that the partition portion 114 is used to separate two adjacent coil windings 200. To ensure the safety distance between two adjacent coil windings 200, the width of the partition portion 114 cannot be too small. If the base 300 is provided with a sliding groove that cooperates with the partition portion 114, the structural strength of the base 300 will be greatly reduced, thereby increasing the risk of the base 300 being damaged and broken under force. In the above embodiment, the base 300 is provided with a positioning protrusion 320, and the side surface of the partition portion 114 is provided with a positioning groove 1141. While achieving positioning, the structural strength of the base 300 can also be ensured. That is to say, under the same structural strength, this embodiment is beneficial to reducing the thickness or volume of the base 300, thereby contributing to the miniaturization design of the common mode inductance.

[0048] In some embodiments of the present application, referring to Figure 1 and Figure 2 , the base 300 includes a bottom plate 310, an outer edge 330, an inner edge 340, a first reinforcing rib 350, and a second reinforcing rib 360. The bottom plate 310 is annular. The outer edge 330 and the inner edge 340 are spaced apart on the bottom plate 310. The first reinforcing rib 350 is disposed on the bottom plate 310. One end of the first reinforcing rib 350 is connected to the outer edge 330, and the other end of the first reinforcing rib 350 extends radially toward the inner edge 340. The second reinforcing rib 360 is disposed on the bottom plate 310. One end of the second reinforcing rib 360 is connected to the inner edge 340, and the other end of the second reinforcing rib 360 extends radially toward the outer edge 330. Among them, the settings of the outer edge 330, the inner edge 340, the first reinforcing rib 350, and the second reinforcing rib 360 can further improve the structural strength of the base 300 and reduce the situation of damage and fracture of the base 300 when stressed.

[0049] In the above embodiments, referring to Figure 2 , the inner edge 340 and the outer edge 330 are concentrically arranged, and the outer edge 330 is located on the outer periphery of the inner edge 340.

[0050] In some embodiments of the present application, referring to Figure 1 and Figure 2 , along the direction from the inner edge 340 to the outer edge 330, the height of the first reinforcing rib 350 gradually increases, and / or the height of the second reinforcing rib 360 gradually decreases. In this way, the interval between the magnetic core assembly 100 and the base 300 can be reduced, which is beneficial to reducing the size of the common mode inductor.

[0051] In a possible implementation manner, referring to Figure 1 and Figure 2 , along the direction from the inner edge 340 to the outer edge 330, the height of the first reinforcing rib 350 gradually increases, and the height of the second reinforcing rib 360 gradually decreases. In this way, the surfaces of the first reinforcing rib 350 and the second reinforcing rib 360 can define the accommodation space for the coil winding 200 and the magnetic core assembly 100, which is beneficial to reducing the interval between the magnetic core assembly 100 and the base 300.

[0052] In some embodiments of the present application, referring to Figure 2 , the first reinforcing rib 350 and the second reinforcing rib 360 are arranged in a staggered manner in the circumferential direction of the bottom plate 310. In this way, the weak area of the base 300 is reduced, and the structural strength of the base 300 can be further improved.

[0053] In this embodiment, in order to make the size as small as possible, the bottom plate 310 of the base 300 is designed with the thinnest thickness. At the same time, an outer edge 330 and an inner edge 340 are provided on the bottom plate 310, and a "water droplet"-shaped first reinforcing rib 350 and a second reinforcing rib 360 are designed between the inner and outer perimeters. The first reinforcing rib 350 and the second reinforcing rib 360 are both arranged in a circular array. Based on this, the strength of the base 300 can be strengthened to avoid damage and fracture of the base 300 under stress. At the same time, the "water droplet"-shaped first reinforcing rib 350 and second reinforcing rib 360 can also avoid the space of the coil winding 200 and the position of the positioning protrusion 320. Even if a notch for distinguishing the pin positions is added near the position of pin 1, the structural strength of the base 300 can be ensured.

[0054] In some embodiments of the present application, referring to Figure 1 and Figure 2 , the common mode inductor further includes a heat conducting member 400. The heat conducting member 400 is disposed on the side of the coil winding 200 away from the base 300. The heat conducting member 400 includes an end cover and an extension portion. One end of the extension portion is connected to the end cover, and the other end of the extension portion extends toward the coil winding 200.

[0055] In this embodiment, the heat conducting member 400 is made of heat conducting glue. The heat conducting glue is arranged in an "umbrella" shape and covers the top of the coil winding 200 and a part of the middle of the magnetic ring 120.

[0056] Further, the housing is grooved at the stepped position corresponding to between the first magnetic core 121 and the second magnetic core 122 to increase the contact surface between the housing and the heat conducting glue. The position on the inner side of the housing of the corresponding complete machine electronic device for auxiliary heat dissipation is changed to a smooth flat top structure. When the common mode inductor is installed in the electronic device, the smooth plane on the inner side of the housing contacts the "umbrella"-shaped heat conducting glue on the top for heat transfer. In this way, compared with the solution of designing a profiling groove structure for components at the corresponding position on the housing of the electronic device, then installing the components on the PCB, covering the housing so that the components are exactly embedded in the profiling groove, and then filling the profiling groove with heat conducting glue to fill the gap between the components and the housing, on the one hand, this embodiment saves the amount of heat conducting glue, and on the other hand, it can also realize the modular design of the components. When changing the solution, different performance specifications of components can be replaced only by maintaining the original height.

[0057] In some embodiments of the present application, an insulating connection layer is provided between the first magnetic core 121 and the second magnetic core 122. The insulating connection layer is used to connect and fix the first magnetic core 121 and the second magnetic core 122, and is also used to keep the first magnetic core 121 and the second magnetic core 122 in an insulating state.

[0058] In a possible implementation manner, the insulating connection layer includes epoxy glue.

[0059] In one embodiment, when manufacturing a common mode inductor, the following steps are included:

[0060] Provide a base 300, a magnetic core assembly 100, and a coil winding 200, and the coil winding 200 is disposed on the outer periphery of the magnetic core assembly 100;

[0061] Set epoxy glue between the base 300 and the coil winding 200;

[0062] Pour thermal conductive silica gel on the side of the coil winding 200 away from the base 300. After the thermal conductive silica gel is cured, blow air through the through hole at the bottom of the jig to demold the thermal conductive silica gel.

[0063] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is 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 thus should not be construed as a limitation to the present application.

[0064] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0065] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0066] In the description of this specification, specific features, structures, materials, or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0067] It should be understood that although the steps in the flowchart of the accompanying drawings are shown sequentially in the direction of the arrows, these steps are not necessarily executed sequentially in the order indicated by the arrows. Unless there is a clear indication in this document, there is no strict order restriction for the execution of these steps, and they can be executed in other orders. Moreover, at least a part of the steps in the flowchart of the accompanying drawings may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be executed alternately or in turn with at least a part of other steps or sub-steps or stages of other steps.

Claims

1. A common mode inductor, characterized in that: include: A magnetic core assembly includes a shell and a magnetic ring, wherein the shell has an annular accommodating cavity, the magnetic core is arranged in the accommodating cavity, the circumscribed circle of the cross-sectional contour of the magnetic ring is circular, the magnetic ring includes a first magnetic core and a second magnetic core, the magnetic permeability of the first magnetic core is greater than the magnetic permeability of the second magnetic core, and the second magnetic core is arranged on both the upper and lower sides of the first magnetic core or the first magnetic core is arranged on both the upper and lower sides of the second magnetic core.

2. The common mode inductor according to claim 1, characterized in that: The first magnetic core is made of nanocrystalline ribbon; and / or the second magnetic core is made of ferrite material.

3. The common mode inductor according to claim 1 or 2, characterized in that: The magnetic ring includes a second magnetic core, a first magnetic core and a second magnetic core which are stacked in sequence, and a cross-sectional area of ​​the first magnetic core is greater than a cross-sectional area of ​​the second magnetic core; or, the magnetic ring includes a first magnetic core, a second magnetic core and a first magnetic core which are stacked in sequence, and a cross-sectional area of ​​the second magnetic core is greater than a cross-sectional area of ​​the first magnetic core.

4. The common mode inductor according to claim 1, characterized in that: The shell comprises a protective shell body and a partition part. There are a plurality of the partition parts. The plurality of the partition parts are arranged at intervals on the outer circumference of the protective shell body, and a coil winding is arranged between two adjacent partition parts.

5. The common mode inductor according to claim 4, characterized in that: It also includes a base, the protective shell body is installed on the base, wherein the base is provided with a positioning protrusion, the partition extends toward one side of the base, and the partition is formed with a positioning groove that cooperates with the positioning protrusion.

6. The common mode inductor according to claim 5, characterized in that: The base comprises a bottom plate, an outer edge, an inner edge, a first reinforcing rib and a second reinforcing rib, the bottom plate is annular, the outer edge and the inner edge are arranged on the bottom plate, the first reinforcing rib is arranged on the bottom plate, one end of the first reinforcing rib is connected to the outer edge, and the other end of the first reinforcing rib extends toward the inner edge along a radial direction; The second reinforcing rib is arranged on the bottom plate, one end of the second reinforcing rib is connected to the inner edge, and the other end of the second reinforcing rib extends toward the outer edge along the radial direction.

7. The common mode inductor according to claim 6, characterized in that: Along the direction from the inner edge to the outer edge, the height of the first reinforcing rib gradually increases, and / or the height of the second reinforcing rib gradually decreases.

8. The common mode inductor according to claim 6, characterized in that: The first reinforcing rib and the second reinforcing rib are staggered in the circumferential direction of the bottom plate.

9. The common mode inductor according to claim 4, characterized in that: It also includes a heat conductive member, which is arranged on a side of the coil winding away from the base. The heat conductive member includes an end cover and an extension portion, one end of the extension portion is connected to the end cover, and the other end of the extension portion extends toward the coil winding.

10. The common mode inductor according to claim 1, characterized in that: An insulating connection layer is provided between the first magnetic core and the second magnetic core.

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