Common mode inductor

Abstract

The embodiment of the utility model discloses a common mode inductor which comprises a magnetic core, a cover plate, a metal terminal, a coil and a welding part, and the magnetic core comprises a middle column and end pole plates connected to the two ends of the middle column; the cover plate is arranged on one side of the magnetic core and is respectively connected with the two end polar plates; the metal terminals are arranged on one side, back to the middle column, of the end pole plate, the two metal terminals on the same side are oppositely arranged, and one side, away from the cover plate, of each metal terminal is provided with a first pressing buckle; the coil is formed by winding a wire on the middle column according to a preset rule; the end part of the wire passes through the first pressing buckle after crossing the end polar plate; the welding part is arranged on the first pressing buckle and a part of the wire passing through the first pressing buckle. According to the scheme, the reliability of the common-mode inductor can be improved.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of inductance, in particular to a common mode inductor. BACKGROUND

[0002] As a key electromagnetic compatibility component, the common mode inductor is widely used in power supply, communication equipment and other electronic products, mainly used for suppressing common mode interference signals. It absorbs or blocks interference signals by introducing magnetic impedance in the circuit, while not affecting the transmission of differential mode signals, so it plays an important role in circuit design.

[0003] However, the current common mode inductor may be loose or not firmly connected at the connection between the metal terminal and the wire during use due to external force impact or vibration, which seriously affects the reliability of the product. CONTENT OF THE UTILITY MODEL

[0004] The embodiment of the present application provides a common mode inductor which can improve the reliability of the common mode inductor.

[0005] The embodiment of the present application provides a common mode inductor, comprising:

[0006] A magnetic core, the magnetic core comprises a middle column and end pole plates connected to both ends of the middle column;

[0007] A cover plate, the cover plate is arranged on one side of the magnetic core and connected with the two end pole plates respectively;

[0008] A metal terminal, the metal terminal is arranged on the side of the end pole plate away from the middle column, and the two metal terminals are arranged oppositely on the same side, and the metal terminal away from the cover plate is provided with a first pressing buckle;

[0009] A coil, the coil is composed of a wire wound on the middle column according to a preset rule, and the end of the wire passes through the first pressing buckle after passing through the end pole plate;

[0010] A welding part, the welding part is arranged on the first pressing buckle and the part of the wire passing through the first pressing buckle.

[0011] In the common mode inductor provided by the embodiment of the present application, the side of the end pole plate away from the cover plate is provided with a wire passing groove, and the end of the wire passes through the first pressing buckle on one metal terminal after passing through the wire passing groove.

[0012] In the common mode inductor provided by the embodiment of the present application, the side of the end pole plate away from the cover plate is provided with a wire passing step, the wire passing step is arranged opposite to the wire passing groove, and the end of the other wire passes through the first pressing buckle on the other metal terminal after passing through the wire passing step.

[0013] In the common mode inductance provided by the embodiment of the present application, the side of the wire passing step is arc-shaped.

[0014] In the common mode inductance provided by the embodiment of the present application, the metal terminal is provided with a second pressing buckle on the side close to the cover plate, and the end of the wire passes through the first pressing buckle and the second pressing buckle in sequence after passing through the end plate.

[0015] In the common mode inductance provided by the embodiment of the present application, a boss structure is arranged between the two metal terminals on the same side, and the boss structure is integrally formed with the end plate.

[0016] In the common mode inductance provided by the embodiment of the present application, the side of the metal terminal away from the cover plate has a buckling part extending towards the middle column, and the buckling part is buckled on the end plate.

[0017] In the common mode inductance provided by the embodiment of the present application, a first adhesive layer is arranged between the metal terminal and the end plate.

[0018] In the common mode inductance provided by the embodiment of the present application, a second adhesive layer is arranged between the end plate and the cover plate.

[0019] In the common mode inductance provided by the embodiment of the present application, the side of the metal terminal away from the end plate has an electroplated layer.

[0020] In summary, the common mode inductance provided by the embodiment of the present application comprises a magnetic core, a cover plate, a metal terminal, a coil and a welding part, wherein the magnetic core comprises a middle column and an end plate connected to both ends of the middle column; the cover plate is arranged on one side of the magnetic core and connected to the two end plates respectively; the metal terminal is arranged on the side of the end plate away from the middle column, and the two metal terminals on the same side are arranged oppositely, and the side of the metal terminal away from the cover plate is provided with a first pressing buckle; the coil is composed of a wire wound on the middle column according to a predetermined rule, and the end of the wire passes through the first pressing buckle after passing through the end plate; and the welding part is arranged on the first pressing buckle and the part of the wire passing through the first pressing buckle. By arranging the first pressing buckle at the connection between the wire end and the metal terminal, the welding part and the wire can be fixed, the risk of the welding part falling off and the wire moving is reduced, and the reliability of the common mode inductance is improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Fig. 1 is a perspective view of a common mode inductor according to an embodiment of the present application.

[0023] Fig. 2 is a front view of a common mode inductor according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] The exemplary embodiments will be described in detail herein below with reference to the drawings. In the following description, unless otherwise indicated, like numbers in the drawings indicate contact or similar elements throughout the various figures. The following detailed description is not intended to state all embodiments in accordance with the application. Rather, it is described in such detail to illustrate devices and methods in accordance with some aspects of the present application, as detailed in the appended claims.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used in the description herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0026] It will be understood that when an element or layer is referred to as being "on" or "connected to" or "coupled to" another element or layer, it can be directly on, connected or coupled to the other element or layer or intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on," "directly connected to," or "directly coupled to" another element or layer, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms since such terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. It will be understood that the terms "comprises" or "comprising," when used in this specification, specify the presence of stated features, integers, steps, or components, but do not preclude the presence or addition of one or more other features, integers, steps, components, or groups thereof.

[0027] Spatially relative terms, such as "beneath", "below", "lower", "under", "above", "upper", "over", "on", "directly on", "indirectly on", "left", "right", "front", "back", "rear", "top", "bottom", "vertical", "horizontal", "above", "below", "up", "down", "side", "end", "furthest", "closest", "inner", "outer" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatial descriptions used herein interpreted accordingly. Likewise, the terms "first", "second", etc., are used herein only to describe different instances, embodiments, etc., and are not intended to, nor should they, imply relative importance or significance to the technical disclosure. The technical disclosure can include a variety of instances, embodiments, etc., although they are described in common herein for convenience. Thus, the terms "first", "second", etc., are used herein only to describe different instances, embodiments, etc., and are not intended to, nor should they, imply relative importance or significance to the technical disclosure.

[0028] The current common mode inductor is subjected to external force impact or vibration during use, which can cause the metal terminal and the wire to be loose or not firmly connected, seriously affecting the reliability of the product.

[0029] Based on this, the embodiment of the present application provides a common mode inductor. The technical solutions shown in the present application will be described in detail through specific embodiments. It should be noted that the description order of the following embodiments is not limited as the priority order of the embodiments.

[0030] Please refer to Figs. 1-2 , Fig. 1 and Fig. 2 The common mode inductor provided by the embodiment of the present application provides a structure diagram of the common mode inductor. The common mode inductor can include a magnetic core 1, a cover plate 2, a metal terminal 3, a coil 4 and a welding part 5.

[0031] The magnetic core 1 includes a middle column 11 and end pole plates 12 connected to both ends of the middle column 11. The magnetic core 1 is made of a magnetic material. The size and shape of the middle column 11 and the end pole plates 12 can be designed according to the application occasion of the common mode inductor and the required magnetic flux. For example, the cross-sectional area of the middle column 11 can be designed to be larger to increase the passing capacity of the magnetic flux, and the thickness of the end pole plates 12 can be appropriately increased to improve the magnetic conductivity efficiency of the magnetic circuit and reduce the risk of magnetic saturation.

[0032] The cover plate 2 is arranged on one side of the magnetic core 1 and connected with the two end pole plates 12 respectively to form a closed magnetic circuit with the magnetic core 1.

[0033] It should be noted that a second adhesive layer (not shown in the figure) is arranged between the end plate 12 and the cover plate 2 to adhesively fix the end plate 12 and the cover plate 2. The second adhesive layer can be formed of a material with high adhesive strength to ensure that the end plate 12 and the cover plate 2 do not relatively displace when subjected to external force impact or vibration, thereby maintaining the stability of the magnetic circuit. In addition, the thickness of the cover plate 2 can be optimized to withstand certain mechanical stress without deformation, further enhancing the mechanical strength and reliability of the common mode inductor.

[0034] The metal terminal 3 is arranged on the side of the end plate 12 facing away from the center column 11, and the two metal terminals 3 on the same side are arranged opposite to each other. A boss structure 121 is arranged between the two metal terminals 3 on the same side, which can isolate the two metal terminals 3 on the same side, effectively preventing short circuit problems caused by positional deviation, accidental contact or electrical failure of the two metal terminals 3, thereby improving the safety and reliability of the common mode inductor.

[0035] In addition, the boss structure 121 is integrally formed with the end plate 12. Through the design of the boss structure 121 integrally formed with the end plate 12, the mechanical strength of the overall structure can be improved, and the possibility of loosening between components is reduced, thereby improving the anti-vibration capability of the common mode inductor.

[0036] It should be noted that a first adhesive layer (not shown in the figure) is arranged between the metal terminal 3 and the end plate 12 to adhesively fix the metal terminal 3 and the end plate 12, and the material of the first adhesive layer can be the same as that of the second adhesive layer. The metal terminal 3 has an electroplated layer (not shown in the figure) on the side facing away from the end plate 12, which can significantly improve the corrosion resistance of the metal terminal 3, especially in humid or highly polluted environments, preventing the problem of poor contact caused by surface oxidation or corrosion of the metal terminal 3. In addition, the electroplated layer can improve the surface flatness and conductivity of the metal terminal 3, making the electrical connection with the wire 41 and the welding portion 5 more stable and reliable.

[0037] In some embodiments, the metal terminal 3 has a clamping portion 51 extending towards the center column 11 on the side facing away from the cover plate 2, and the clamping portion 51 is clamped on the end plate 12. The firm connection of the clamping portion 51 and the end plate 12 can further enhance the mechanical bonding strength of the metal terminal 3 and the end plate 12, improving the durability and stability of the overall common mode inductor.

[0038] The coil 4 is formed by winding the wire 41 around the middle column 11 according to a predetermined rule. The wire 41 can be a copper wire or an aluminum wire to provide good electrical conductivity. The diameter of the wire 41 and the number of turns of the coil 4 can be selected according to the intended use of the common mode inductor and the required inductance value. In addition, the winding method of the coil 4 can be tight winding or loose winding to adapt to different inductance characteristics and heat management requirements. Tight winding can reduce the capacitive effect between the coils 4, while loose winding can help dissipate heat and prevent overheating. In some cases, to further optimize performance, the surface of the wire 41 can be coated with an insulating layer to reduce leakage between adjacent turns and improve overall insulation performance.

[0039] In some embodiments, a first press buckle 52 is provided on the side of the metal terminal 3 away from the cover plate 2, and the end of the wire 41 passes through the first press buckle 52 after passing through the end plate 12. The welding portion 5 can be provided on the first press buckle 52 and the portion of the wire 41 passing through the first press buckle 52. In a specific implementation process, welding can be performed on the first press buckle 52 and the portion of the wire 41 passing through the first press buckle 52 after the end of the wire 41 passes through the first press buckle 52 to form the welding portion 5. The first press buckle 52 can fix the welding portion 5 and the wire 41, reducing the risk of the welding portion 5 falling off and the wire 41 moving, thereby improving the reliability of the common mode inductor.

[0040] In some embodiments, a second press buckle 53 can also be provided on the side of the metal terminal 3 close to the cover plate 2. The end of the wire 41 passes through the first press buckle 52 and the second press buckle 53 in sequence after passing through the end plate 12. The second press buckle 53 can further fix the end of the wire 41, thereby reducing the risk of the wire 41 moving and further improving the reliability of the common mode inductor.

[0041] In the embodiments of the present application, the end plate 12 is provided with a wire passing groove 13 and a wire passing step 14 arranged opposite to each other on the side away from the cover plate 2. The end of one wire 41 passes through the wire passing groove 13 and then passes through the first press buckle 52 and the second press buckle 53 on one metal terminal 3 in sequence, and the end of the other wire 41 passes through the wire passing step 14 and then passes through the first press buckle 52 and the second press buckle 53 on the other metal terminal 3 in sequence.

[0042] It should be noted that the provision of the wire passing groove 13 and the wire passing step 14 can optimize the wiring path of the wire 41. The groove depth of the wire passing groove 13 is greater than the wire diameter of the wire 41, so that the wire passing groove 13 can better accommodate and guide the wire 41. The groove shape of the wire passing groove 13 can be arc-shaped, triangular, U-shaped, trapezoidal or rectangular. The side of the wire passing step 14 is arc-shaped, effectively reducing the risk of wear and stress concentration that the wire 41 may suffer during passing through the wire passing step 14, thereby prolonging the service life of the wire 41 and further improving the reliability of the overall structure of the common mode inductor.

[0043] In summary, the common mode inductor provided by the embodiments of the present application comprises a magnetic core 1, a cover plate 2, a metal terminal 3, a coil 4 and a welding portion 5, wherein the magnetic core 1 comprises a middle column 11 and end pole plates 12 connected to both ends of the middle column 11; the cover plate 2 is arranged on one side of the magnetic core 1 and connected to the two end pole plates 12 respectively; the metal terminal 3 is arranged on the side of the end pole plate 12 away from the middle column 11, and the two metal terminals 3 are arranged opposite to each other on the same side, and the metal terminal 3 away from the cover plate 2 is provided with a first pressing buckle 52; the coil 4 is composed of a wire 41 wound on the middle column 11 according to a preset rule, and the end of the wire 41 passes through the first pressing buckle 52 after passing through the end pole plate 12; and the welding portion 5 is arranged on the first pressing buckle 52 and the part of the wire 41 passing through the first pressing buckle 52. By arranging the first pressing buckle 52 and the second pressing buckle 53 at the connection between the end of the wire 41 and the metal terminal 3, the welding portion 5 and the wire 41 can be fixed, the risk of the welding portion 5 falling off and the wire 41 moving is reduced, and the reliability of the common mode inductor is improved.

[0044] The common mode inductor provided by the present application is described in detail above, and the principles and implementation manners of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manner and application range will be changed, and the above description of the present application should not be understood as a limitation.

Claims

1. A common mode inductor, characterized by The utility model relates to a magnetic core, which comprises a middle column and end pole plates connected to both ends of the middle column; a cover plate arranged on one side of the magnetic core and connected to the two end pole plates respectively; metal terminals arranged on the side of the end pole plates away from the middle column, with the two metal terminals arranged oppositely on the same side, and the metal terminals provided with first buckles on the side away from the cover plate; and a coil formed by winding a wire around the middle column according to a preset rule, with the end of the wire passing through the end pole plates and then through the first buckles; and a welding part arranged on the first buckles and the part of the wire passing through the first buckles. The side of the end pole plates away from the cover plate is provided with a wire passing groove, and the end of one wire passes through the wire passing groove and then through the first buckle on one metal terminal. The side of the end pole plates away from the cover plate is provided with a wire passing step, which is arranged opposite to the wire passing groove, and the end of the other wire passes through the wire passing step and then through the first buckle on the other metal terminal. The side of the wire passing step is arc-shaped. The side of the metal terminal close to the cover plate is provided with a second buckle, and the end of the wire passes through the first buckle and then the second buckle in sequence after passing through the end pole plates. A boss structure is arranged between the two metal terminals on the same side, and the boss structure is integrally formed with the end pole plates.

2. The common mode inductance of claim 1, wherein, The side of the metal terminal away from the cover plate has a clamping part extending towards the middle column, and the clamping part is clamped on the end pole plates.

3. The common mode inductance of claim 2, wherein, A first adhesive layer is arranged between the metal terminal and the end pole plates.

4. The common mode inductance of claim 3, wherein, A second adhesive layer is arranged between the end pole plates and the cover plate.

5. The common mode inductance of any one of claims 1-3, wherein, The side of the metal terminal away from the end pole plates has an electroplated layer.

6. The common mode inductance of any one of claims 1-3, wherein, ​ 7. The common mode inductance of any one of claims 1-3, wherein, ​ 8. The common mode inductance of any one of claims 1-3, wherein, ​ 9. The common mode inductance of any one of claims 1-3, wherein, ​ 10. The common mode inductance of any one of claims 1-3, wherein, ​

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