Common mode inductor

Abstract

The utility model provides a common mode inductor. The common mode inductor comprises a U-shaped winding, a magnetic core, a support and a PCB. Wherein the support is arranged on the U-shaped winding in a sleeved mode, the support and the U-shaped winding are integrally formed in an injection molding mode, the support is of a hollow structure with a containing space, the magnetic core is placed in the containing space of the support, a plurality of conductive bands arranged in parallel are arranged on the PCB, and pins of the U-shaped winding are correspondingly connected to the conductive bands respectively. The common-mode inductor solves the problems that in the prior art, flat copper wires serve as winding wires, so that the common-mode inductor is too large in size, complex in technology, high in production cost and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of inductor components, and particularly relates to a common-mode inductor. Background Art

[0002] The winding of the inductor is usually made of copper wire. However, the winding of flat copper wire is limited by its own shape and cannot fit well with the magnetic core, which will increase the volume and space. To solve this problem, the conventional practice is to break the entire circle of flat copper wire into U / I shape, assemble the U / I-shaped flat copper wire on the magnetic core through tooling, and then weld the U / I joints to form a complete winding path. This approach either sacrifices volume and simplifies the process, or adds complex and precise tooling and welding equipment for preparation. Utility Model Content

[0003] The utility model provides a common-mode inductor to solve the problems of large volume, complex process and high production cost caused by using flat copper wire as winding in the existing process.

[0004] In order to solve or improve the above technical problems to a certain extent, according to the utility model, a common mode inductor is provided, comprising: a U-shaped winding, a magnetic core, a bracket and a PCB board;

[0005] Among them, the bracket is sleeved on the part of the U-shaped winding, and the bracket and the U-shaped winding are injection molded as one piece. The bracket is constructed as a hollow structure with an accommodating space. The magnetic core is placed in the accommodating space of the bracket. A plurality of parallel conductive strips are provided on the PCB board, and the pins of the U-shaped winding are respectively connected to the conductive strips.

[0006] In some embodiments, the bracket includes a bracket body, the bracket body and the U-shaped winding are integrally injection molded, the bracket body is constructed as a hollow slot structure with an opening, and the cover plate is buckled at the opening of the bracket body.

[0007] In some embodiments, the magnetic core is configured as an annular shape, and the bracket body is configured as an annular slot structure corresponding to the magnetic core.

[0008] In some embodiments, the cover plate is provided with a plurality of positioning holes corresponding to the pins of the U-shaped winding, and a plurality of the pins pass through the corresponding positioning holes.

[0009] In some embodiments, the U-shaped winding is formed by arranging a plurality of U-shaped windings, and each of the U-shaped windings has two pins.

[0010] In some embodiments, the U-shaped winding wire is a flat copper wire.

[0011] In some embodiments, a plurality of the U-shaped windings are arranged to form two side-by-side U-shaped windings, and the bracket is mounted on two adjacent columns of pins of the two columns of U-shaped windings.

[0012] In some embodiments, the ends of the pins of the U-shaped winding are configured as chamfered structures.

[0013] In some embodiments, the conductive tape is disposed inside the PCB board, or the conductive tape is attached to the outside of the PCB board.

[0014] In some embodiments, the conductive tape is a copper tape.

[0015] The utility model saves the tooling equipment for combining the U-shaped winding and the magnetic core by integrally injection molding the U-shaped winding and the bracket, reduces the production cost, improves the production efficiency, and can ensure the fit between the U-shaped winding and the magnetic core. By arranging multiple parallel conductive strips on the PCB board, when the winding is connected to the PCB board, the two pins of one winding of the winding are simultaneously connected to one conductive strip, thereby improving the integrity of the winding and effectively improving the current-carrying capacity of the winding.

[0016] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In addition, in order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the partial structure decomposition of a common-mode inductor according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic structural diagram of a U-shaped winding and a bracket body according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic structural diagram of a U-shaped winding, a bracket body, and a magnetic core according to an embodiment of the present invention;

[0020] Figure 4 This is a structural diagram of a cover plate according to an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of a partial structure of a common-mode inductor according to an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the partial structure of a PCB board according to an embodiment of the present invention.

[0023]

Explanation of symbols

[0024] 1. U-shaped winding

[0025] 10. U-shaped winding

[0026] 100, Pin

[0027] 1000, end

[0028] 2. Bracket

[0029] 20. Bracket body

[0030] 21. Cover

[0031] 210. Positioning hole

[0032] 3. Magnetic core

[0033] 4. PCB board

[0034] 40. Conductive tape DETAILED DESCRIPTION

[0035] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the present invention, the following is a detailed description of the specific implementation and effects of a common-mode inductor proposed according to the present invention in conjunction with the accompanying drawings and preferred embodiments.

[0036] According to an embodiment of the present invention, a common mode inductor is provided, such as Figure 1-6 As shown, the common-mode inductor includes: a U-shaped winding 1, a magnetic core 3, a bracket 2 and a PCB board 4.

[0037] The U-shaped winding 1 is formed by arranging a plurality of U-shaped windings 10, and each U-shaped winding 10 has two pins 100. Figure 1 As shown, there are two U-shaped windings 1 , and the two U-shaped windings 1 are arranged side by side.

[0038] In one embodiment, to meet the requirements of higher power and smaller size, the common-mode inductor's magnetic core 3 is a nanocrystalline core 3, which provides higher magnetic permeability and higher saturation magnetic induction. The use of the nanocrystalline core 3 effectively reduces the volume and weight of the common-mode inductor.

[0039] In this embodiment, in order to match the nanocrystalline magnetic core 3 , the U-shaped winding 10 is made of flat copper wire.

[0040] In order to make the U-shaped winding 10 fit the magnetic core 3 better, after the U-shaped winding 1 is prepared, the bracket 2 and the U-shaped winding 1 are integrally injection molded, that is, injection molding is performed on the prepared U-shaped winding 1 to obtain the bracket 2 that fits the U-shaped winding 1. Figure 3As shown, the injection-molded bracket 2 is constructed as a hollow structure with an accommodating space, and the magnetic core 3 is placed in the accommodating space of the bracket 2.

[0041] In one embodiment, if Figure 1 As shown, after the two U-shaped windings 1 are arranged side by side, there are two adjacent columns of pins 100, and the bracket 2 is sleeved on the two adjacent columns of pins 100, and the magnetic core 3 placed in the accommodating space of the bracket 2 is also sleeved on the two adjacent columns of pins 100.

[0042] Alternatively, as Figure 1 As shown, the bracket 2 includes a bracket body 20 and a cover plate 21. The bracket body 20 is integrally injection-molded with the U-shaped winding 1 and is constructed as a hollow slot structure with an opening, as shown in FIG. Figure 2 As shown. The bracket body 20 is an annular structure, such as an elliptical or racetrack annular structure. The annular bracket body 20 is sleeved on two adjacent rows of pins 100 of the U-shaped winding 1. The cover 21 is buckled at the opening of the bracket body 20 so that the bracket 2 forms an accommodating space for placing the magnetic core 3. Figure 3 As shown, the magnetic core 3 is also constructed as an annular structure corresponding to the slot structure of the bracket body 20, such as an elliptical or racetrack annular structure.

[0043] In this embodiment, the bracket 2 is configured as a separate structure of a bracket body 20 and a cover plate 21 , which can facilitate placement of the magnetic core 3 in the accommodating space of the bracket 2 .

[0044] In one embodiment, if Figure 4 As shown, a plurality of positioning holes 210 are provided on the cover plate 21 of the bracket 2, and the number of the positioning holes 210 is the same as the number of the pins 100 of the U-shaped winding 1, as shown in FIG. Figure 5 As shown, when the cover plate 21 of the bracket 2 is covered on the bracket body 20 , the pins 100 of the U-shaped winding 1 pass through the corresponding positioning holes 210 respectively to limit the positions of the multiple U-shaped windings 10 of the U-shaped winding 1 .

[0045] Alternatively, as Figure 1 and Figure 5 As shown, the ends 1000 of the plurality of pins 100 of the U-shaped winding 1 are configured as chamfered structures so that the pins 100 can pass through the positioning holes 210 provided on the cover plate 21 .

[0046] like Figure 6 As shown, a plurality of parallel conductive strips 40 are provided on the PCB board 4, and each conductive strip 40 corresponds to two pins 100 of a U-shaped winding 10. The two pins 100 of each U-shaped winding 10 can be connected to the same conductive strip 40 by welding.

[0047] Optionally, the conductive tape 40 is a copper tape to ensure that it has a current carrying capacity that matches the U-shaped winding 10 using a flat copper wire.

[0048] In this embodiment, the conductive tape 40 can be provided inside the PCB, that is, the conductive tape 40 is provided inside the substrate of the PCB board 4. The conductive tape 40 can also be applied to the outside of the PCB board 4, that is, the conductive tape 40 is applied to the surface of the substrate of the PCB board 4.

[0049] According to an embodiment of the present invention, a preparation process of a common-mode inductor is also provided, comprising the following steps:

[0050] Step 1: Injection molding is performed on the U-shaped winding to form a bracket body integrally formed with the U-shaped winding.

[0051] Step 2: Place the magnetic core into the empty slot of the bracket body through the opening of the bracket body.

[0052] Step 3: Place the cover plate of the bracket on the opening of the bracket body, and allow the multiple pins of the U-shaped winding to pass through the multiple positioning holes provided on the cover plate.

[0053] Step 4: Solder the pins of the U-shaped winding to the conductive tapes provided on the PCB board. The conductive tapes can be provided inside the substrate of the PCB board or can be attached to the surface of the substrate of the PCB board.

[0054] In the common-mode inductor of the present invention, the U-shaped winding and the bracket are integrally injection-molded, which saves tooling equipment for combining the U-shaped winding and the magnetic core, reduces production costs, improves production efficiency, and ensures the fit between the U-shaped winding and the magnetic core. By arranging multiple parallel conductive strips on the PCB board, when the winding is connected to the PCB board, two pins of one winding of the winding are simultaneously connected to one conductive strip, thereby improving the integrity of the winding and effectively enhancing the current-carrying capacity of the winding.

[0055] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A common mode inductor, characterized in that: include: U-shaped winding, magnetic core, bracket and PCB board; Among them, the bracket is sleeved on a part of the U-shaped winding, and the bracket and the U-shaped winding are integrally injection molded, the bracket is constructed as a hollow structure with an accommodating space, the magnetic core is placed in the accommodating space of the bracket, and a plurality of parallel conductive strips are arranged on the PCB board, and the pins of the U-shaped winding are respectively connected to the conductive strips.

2. The common mode inductor according to claim 1, characterized in that: The bracket comprises a bracket body and a cover plate. The bracket body and the U-shaped winding are integrally injection-molded. The bracket body is constructed as a hollow slot structure with an opening, and the cover plate is buckled at the opening of the bracket body.

3. The common mode inductor according to claim 2, characterized in that: The magnetic core is constructed in an annular shape, and the bracket body is constructed in an annular hollow groove structure corresponding to the magnetic core.

4. The common mode inductor according to claim 2 or 3, characterized in that: The cover plate is provided with a plurality of positioning holes corresponding to the pins of the U-shaped winding, and a plurality of the pins pass through the corresponding positioning holes.

5. The common mode inductor according to claim 1, characterized in that: The U-shaped winding is formed by arranging a plurality of U-shaped windings, and each of the U-shaped windings has two pins.

6. The common mode inductor according to claim 5, characterized in that: The U-shaped winding is a flat copper wire.

7. The common mode inductor according to claim 6, characterized in that: A plurality of the U-shaped windings are arranged to form two parallel U-shaped windings, and the bracket is sleeved on two adjacent rows of pins of the two rows of U-shaped windings.

8. The common mode inductor according to claim 6, characterized in that: The end of the pin of the U-shaped winding is configured as a chamfered structure.

9. The common mode inductor according to claim 1 or 2, characterized in that: The conductive tape is arranged inside the PCB board, or the conductive tape is attached to the outside of the PCB board.

10. The common mode inductor according to claim 9, characterized in that: The conductive tape is a copper tape.

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