Common mode inductor

Abstract

The embodiment of the utility model discloses a common mode inductor which comprises a magnetic core, a metal terminal and a coil, and the magnetic core comprises a middle column and end polar plates connected to the two ends of the middle column; the metal terminals are arranged on one side, opposite to the middle column, of the end polar plate, the two metal terminals located on the same side are oppositely arranged, each metal terminal comprises a buckling terminal and a terminal pin which are integrally connected, the buckling terminals are buckled on the top surface of the end polar plate, and the terminal pins extend towards the bottom surface of the end polar plate and extend out of the bottom surface of the end polar plate; the coil is formed by winding a wire on the middle column according to a preset rule, and the end part of the wire crosses the end pole plate and then is wound on the terminal pin. According to the scheme, dependence on an auxiliary mechanism can be avoided during winding.

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] The common mode inductor is an inductor device used to suppress common mode interference, usually composed of a magnetic core and a wire wound thereon. Its main function is to filter common mode noise by providing high impedance to ensure stable operation of the power supply. Especially in switching power supply, good electromagnetic interference suppression capability is crucial for the reliability and compliance of the equipment.

[0003] However, in the current manufacturing process of common mode inductor, in order to ensure the stability of copper wire during winding, additional auxiliary mechanism is often needed to increase the tension of copper wire. Although these mechanisms are effective, they increase the spacing between winding shafts, limiting the number of winding shafts that can be performed simultaneously, thereby reducing production efficiency. CONTENT OF THE UTILITY MODEL

[0004] The embodiment of the present application provides a common mode inductor which can be wound without relying on auxiliary mechanism.

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

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

[0007] The metal terminal is arranged on the side of the end pole plate away from the middle column, and the two metal terminals on the same side are arranged oppositely, the metal terminal comprises a clamping terminal and a terminal pin connected integrally, the clamping terminal is clamped on the top surface of the end pole plate, and the terminal pin extends towards the bottom surface of the end pole plate and protrudes out of the bottom surface of the end pole plate;

[0008] The coil is composed of a wire wound on the middle column according to a predetermined rule, and the end of the wire is wound on the terminal pin after passing through the end pole plate.

[0009] In the common mode inductor provided by the embodiment of the present application, a pre-breakage opening is arranged on the terminal pin.

[0010] In the common mode inductor provided by the embodiment of the present application, a limiting structure is arranged on the terminal pin, and the limiting structure is used to limit the wire wound on the terminal pin.

[0011] In the common mode inductor provided by the embodiment of the present application, the top surface of the end pole plate is provided with a wire passing groove, and the end of the wire is wound on the terminal pin through the wire passing groove.

[0012] In the common mode inductance provided by the embodiment of the present application, the slot body depth of the wire slot is greater than the wire diameter of the wire.

[0013] In the common mode inductance provided by the embodiment of the present application, the top surface of the end plate is provided with a wire passing step, the wire passing step is arranged opposite to the wire slot, and the end portion of the other wire is wound on the terminal pin through the wire passing step and the wire slot.

[0014] In the common mode inductance provided by the embodiment of the present application, the side surface of the wire passing step is arc-shaped.

[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 summary, the common mode inductance provided by the embodiment of the present application comprises a magnetic core, a metal terminal and a coil, wherein the magnetic core comprises a middle column and an end plate connected to both ends of the middle column; the metal terminal is arranged on the side of the end plate away from the middle column, the two metal terminals on the same side are arranged opposite to each other, the metal terminal comprises an integrated buckling terminal and a terminal pin, the buckling terminal buckles on the top surface of the end plate, and the terminal pin extends towards the bottom surface of the end plate and protrudes from the bottom surface of the end plate; the coil is composed of a wire wound on the middle column according to a preset rule, and the end portion of the wire is wound on the terminal pin after passing the end plate. The terminal pin protruding from the bottom surface of the end plate can directly bind the wire at the position of the terminal pin without relying on any auxiliary mechanism during the winding operation. That is, the present scheme can be independent of the auxiliary mechanism during winding. BRIEF DESCRIPTION OF DRAWINGS

[0017] 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.

[0018] Figure 1 is the first structure schematic diagram of the common mode inductance provided by the embodiment of the present application.

[0019] Figure 2 is the structure schematic diagram of the metal terminal provided by the embodiment of the present application.

[0020] Figure 3 is the second structure schematic diagram of the common mode inductance provided by the embodiment of the present application.

[0021] Figure 4FIG. 3 is a third structure diagram of a common mode inductor provided by an embodiment of the present application. DETAILED DESCRIPTION

[0022] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The description herein relates to the drawings, in which the same numbers in different drawings represent the same or similar elements throughout. The following detailed description is not intended to represent all embodiments in accordance with the present application. Rather, they are merely examples in accordance with some aspects of the present application as detailed in the appended claims.

[0023] 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.

[0024] It will be understood that when an element or layer is referred to as being "on", "adjacent", "connected to" or "coupled to" another element or layer, it can be directly on, adjacent, connected or coupled to the other element or layer, or one or more intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on", "directly adjacent", "directly connected to" or "directly coupled to" another element or layer, then 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 so used are interchangeable under appropriate circumstances and embodiments of the application are capable of producing devices in which such elements, components, regions, layers and / or sections are either directly adjacent each other without intervening elements or layers, or are not directly adjacent each other with intervening elements or layers present.

[0025] 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.

[0026] In the current manufacturing process of common mode inductors, additional auxiliary mechanisms are often needed to increase the tension of the copper wire during winding to ensure the stability of the copper wire. Although these mechanisms are effective, they increase the distance between the winding shafts and the shafts, limiting the number of winding shafts that can be performed simultaneously, thereby reducing production efficiency.

[0027] 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.

[0028] Please refer to Figures 1-2 The common mode inductor can include a magnetic core 1, a metal terminal 2, and a coil 3.

[0029] The magnetic core 1 includes a middle column and end pole plates 11 connected to both ends of the middle column (not shown in the figure). The magnetic core 1 includes a middle column and end pole plates 11 connected to both ends of the middle column. The magnetic core 1 is made of a magnetic material. The size and shape of the middle column and the end pole plates 11 can be designed according to the application of the common mode inductor and the required magnetic flux. For example, the cross-sectional area of the middle column can be designed to be larger to increase the passing capacity of the magnetic flux, and the thickness of the end pole plates 11 can be appropriately increased to improve the magnetic conductivity efficiency of the magnetic circuit and reduce the risk of magnetic saturation.

[0030] The metal terminal 2 is arranged on the side of the end plate 11 away from the center column, and two metal terminals 2 are arranged opposite to each other on the same side. A boss structure 113 is arranged between the two metal terminals 2 on the same side, which can isolate the two metal terminals 2 on the same side, effectively prevent the short circuit problem caused by position deviation, accidental contact or electrical failure of the two metal terminals 2, and improve the safety and reliability of the common mode inductance.

[0031] In addition, the boss structure 113 is integrally formed with the end plate 11. Through the design of the boss structure 113 integrally formed with the end plate 11, 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 inductance.

[0032] The coil 3 is composed of a wire 31 wound on the center column according to a predetermined rule. The wire 31 can be a copper wire or an aluminum wire to provide good electrical conductivity. The diameter of the wire 31 and the number of turns of the coil 3 can be selected according to the intended use and the required inductance value of the common mode inductance. In addition, the winding method of the coil 3 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 3, while loose winding can help dissipate heat and prevent overheating. In some cases, in order to further optimize the performance, an insulating layer can be coated on the surface of the wire 31 to reduce the leakage between adjacent turns and improve the overall insulation performance.

[0033] In the embodiments of the present application, the metal terminal 2 includes a snap-in terminal 21 and a terminal leg 22 integrally connected.

[0034] The snap-in terminal 21 is snap-in to the top surface of the end plate 11. The firm connection of the snap-in terminal 21 and the end plate 11 can further enhance the mechanical bonding strength of the metal terminal 2 and the end plate 11, and improve the durability and stability of the overall common mode inductance.

[0035] The terminal leg 22 extends towards the bottom surface of the end plate 11 and protrudes out of the bottom surface of the end plate 11. The end of the wire 31 is wound on the terminal leg 22 after passing through the end plate 11. In some embodiments, a limiting structure 222 is arranged on the terminal leg 22, which is used to limit the wire 31 wound on the terminal leg 22, and ensure the position of the wire 31 on the terminal leg 22 is fixed.

[0036] It can be understood that the top surface and the bottom surface of the end plate 11 are two opposite surfaces.

[0037] In the embodiments of the present application, the top surface of the end plate 11 is provided with a wire passing groove 111 and a wire passing step 112 arranged opposite to each other. The end of one wire 31 is wound on the terminal leg 22 through the wire passing groove 111. The end of the other wire 31 is wound on the terminal leg 22 through the wire passing groove 111 through the wire passing step 112.

[0038] In some embodiments, a pre-breakage 221 is provided on the terminal leg 22. The pre-breakage 221 is a pre-set cut on the terminal leg 22 for facilitating the disposal of the tail wire during the winding process. It ensures that the excess tail wire can be quickly and accurately cut off after the winding is completed. When designing the pre-breakage 221, the appropriate size and position should be determined according to the diameter of the wire 31 and the specific requirements of the winding. The depth of the pre-breakage 221 is usually 1 / 3 of the thickness of the metal terminal 2 to ensure that the overall structure of the winding is not affected when cutting off.

[0039] As shown in Figure 3 , the terminal leg 22 is provided with a welding surface 223 on the side facing the top surface of the terminal plate 11. After the winding is completed, the contact position of the wire 31 with the welding surface 223 can be spot welded to form a welded structure. Then, the excess terminal leg 22 is cut off through the pre-breakage 221 to cut off the excess tail wire.

[0040] In some specific embodiments, a press welding process can also be performed on the contact position of the wire 31 with the welding surface 223 after the winding is completed. During the press welding process, due to the pre-provision of the pre-breakage 221, the excess terminal leg 22 will be effectively pressed off. At the same time, in addition to the part of the wire 31 in contact with the welding surface 223, the excess tail wire (i.e. the remaining part of the wire on the terminal leg 22) will also be removed during the press welding process, thereby forming a structure as shown in Figure 4 .

[0041] It should be noted that the provision of the wire passage groove 111 and the wire passage step 112 can optimize the wiring path of the wire 31. The groove depth of the wire passage groove 111 is greater than the wire diameter of the wire 31, so that the wire passage groove 111 can better accommodate and guide the wire 31. The groove shape of the wire passage groove 111 can be arc-shaped, triangular, U-shaped, trapezoidal or rectangular. The side of the wire passage step 112 is arc-shaped, effectively reducing the risk of wear and stress concentration that the wire 31 may suffer during the process of passing through the wire passage step 112, thereby prolonging the service life of the wire 31 and further improving the reliability of the overall structure of the common mode inductance.

[0042] In summary, the common mode inductor provided by the embodiment of the application comprises a magnetic core 1, metal terminals 2 and a coil 3, wherein the magnetic core 1 comprises a middle column and end pole plates 11 connected to two ends of the middle column; the metal terminals 2 are arranged on a side of the end pole plates 11 away from the middle column, and two metal terminals 2 on the same side are arranged oppositely, the metal terminal 2 comprises an integrated buckling terminal 21 and a terminal leg 22, the buckling terminal 21 is buckled on the top surface of the end pole plate 11, the terminal leg 22 extends towards the bottom surface of the end pole plate 11 and protrudes from the bottom surface of the end pole plate 11; the coil 3 is formed by winding a wire 31 on the middle column according to a preset rule, and the end of the wire 31 is wound on the terminal leg 22 after passing over the end pole plate 11. The scheme sets the terminal leg 22 protruding from the bottom surface of the end pole plate 11, and when winding operation is performed, any auxiliary mechanism is not needed, and the wire binding work can be directly performed at the position of the terminal leg 22, so that the distance between the shafts can be greatly reduced, the number of winding shafts is increased, multi-shaft winding can be realized at the same time in a short time, and the efficiency is improved.

[0043] The common mode inductor provided by the application is described in detail above, and the principle and implementation mode of the application are described by applying specific examples; the description of the above embodiments is only used to help understand the core idea of the application; meanwhile, for those skilled in the art, according to the idea of the application, the specific implementation mode and application range will be changed, and the above description should not be understood as limiting the application.

Claims

1. A common-mode inductor, characterized in that, include: A magnetic core, the magnetic core comprising a central post and end plates connected to both ends of the central post; The metal terminal is disposed on the side of the end plate facing away from the central column. Two metal terminals on the same side are disposed opposite each other. The metal terminal includes an integrally connected snap-fit ​​terminal and a terminal foot. The snap-fit ​​terminal snaps onto the top surface of the end plate, and the terminal foot extends toward the bottom surface of the end plate and protrudes from the bottom surface of the end plate. The coil is composed of wires wound around the central column according to a preset rule, and the end of the wires passes over the end plate and is wound around the terminal pin.

2. The common-mode inductor as described in claim 1, characterized in that, The terminal pins are provided with pre-cut ends.

3. The common-mode inductor as described in claim 1, characterized in that, The terminal pin is provided with a limiting structure, which is used to limit the wire wrapped around the terminal pin.

4. The common-mode inductor as described in claim 1, characterized in that, The top surface of the terminal plate is provided with a wire groove, and the end of one of the wires is wound around the terminal foot through the wire groove.

5. The common-mode inductor as described in claim 4, characterized in that, The depth of the groove is greater than the diameter of the conductor.

6. The common-mode inductor as described in claim 4, characterized in that, The top surface of the terminal plate is provided with a wire-passing step, which is arranged opposite to the wire-passing groove. The end of the other wire passes through the wire-passing step and the wire-passing groove to be wound around the terminal foot.

7. The common-mode inductor as described in claim 6, characterized in that, The side of the step over the line is arc-shaped.

8. The common-mode inductor as described in any one of claims 1-7, characterized in that, A boss structure is provided between the two metal terminals on the same side, and the boss structure is integrally formed with the terminal plate.

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