A common differential mode inductor

Abstract

The utility model discloses a kind of common mode inductance, belong to common mode inductance technical field, including shell and magnetic core, the magnetic core is fixed in shell, two groups of winding are wound on the magnetic core, the magnetic core is equipped with magnetic plate;The shell outer wall is fixedly connected with pin, and the end of the winding is fixed on the pin;Through the design of placing magnetic plate in the magnetic core, increase the asymmetry of magnetic circuit, enhance differential mode component, adjust common mode rejection ratio, improve differential mode inductance, ensure differential mode suppression capability;Pin and winding on magnetic core are separated by the design of shell side wall, in the soldering tin process of pin and PCB pad, coil is physically isolated by shell, effectively avoid the problem of coil scald.

Description

Technical Field

[0001] This utility model relates to the field of common-mode inductor technology, and in particular to a common-mode inductor. Background Technology

[0002] Inductors are devices that effectively suppress electromagnetic interference in circuits. They are one of the most commonly used components in electronic circuits and are widely used in various electronic parts.

[0003] Among inductors, common-mode inductors can suppress both common-mode and differential-mode interference, and are therefore widely used.

[0004] However, the existing internal structure of common-mode inductors simply uses the same magnetic core to wind two sets of coils. This results in insufficient differential mode suppression capability, and because the inductor pins are very close to the coils, the coils are easily burned during soldering. Utility Model Content

[0005] The purpose of this invention is to solve the technical problems in the prior art, which is that using the same magnetic core to wind two sets of coils results in insufficient differential mode suppression capability, and that the inductor pins are very close to the coils, which can easily cause the coils to be burned during soldering. Therefore, this invention proposes a common differential mode inductor.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A common-mode inductor includes a housing and a magnetic core. The magnetic core is fixed inside the housing and has two sets of windings wound on it. A magnetic plate is provided inside the magnetic core. Pins are fixedly connected to the outer wall of the housing, and the ends of the windings are fixed to the pins.

[0007] Preferably, the magnetic plate is made of ferrite or nanocrystalline alloy.

[0008] Preferably, the magnetic plate is fixedly connected to the housing.

[0009] Preferably, the number of pins is four.

[0010] Preferably, the pin is in the shape of a sheet.

[0011] Preferably, the four corners of the housing are fixed with snap-fit ​​plates, and the pins are fixed to the bottom of the snap-fit ​​plates.

[0012] Preferably, the snap-fit ​​plate is U-shaped.

[0013] Preferably, the snap-on plate and the pins are integrally formed.

[0014] Preferably, the housing is provided with wiring grooves.

[0015] Compared with the prior art, the present invention provides a common-mode inductor with the following advantages: 1. This common-mode inductor increases the magnetic circuit asymmetry by placing a magnetic plate inside the magnetic core, thereby enhancing the differential mode component, adjusting the common-mode rejection ratio, increasing the differential mode inductance, and ensuring differential mode rejection capability. 2. This common-mode inductor features a design that separates the pins from the windings on the magnetic core through the sidewall of the housing. During the soldering process between the pins and the PCB pads, the housing physically isolates the coil, effectively preventing the coil from getting burned. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a common-mode inductor proposed in this utility model. Figure 1 ; Figure 2 This is a schematic diagram of the structure of a common-mode inductor proposed in this utility model. Figure 2 ; Figure 3 This is a schematic diagram of the structure of a common-mode inductor housing proposed in this utility model; Figure 4 This is a schematic diagram of the structure of a common-mode inductor winding proposed in this utility model.

[0017] In the diagram: 1. Housing; 101. Magnetic core; 2. Winding wire; 201. Pin; 202. Wiring groove; 3. Magnetic plate; 4. Connecting plate. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] Example: like Figures 1-4 A common-mode inductor includes a housing 1 and a magnetic core 101. The housing 1 is made of injection-molded plastic, and the magnetic core 101 is fixed inside the housing 1. Two sets of windings 2 are wound on the magnetic core 101, such as... Figure 4Two sets of windings 2 are wound around the two sides of the magnetic core 101 respectively. The magnetic core 101 is provided with a magnetic plate 3. The magnetic plate 3 is made of ferrite or nanocrystalline alloy. The magnetic plate 3 is fixedly connected to the shell 1 by adhesive.

[0021] The outer wall of the housing 1 is fixedly connected with pins 201. That is, the pins 201 and the winding 2 on the magnetic core 101 are separated by the side wall of the housing 1 and are located on both sides of the housing 1. There are four pins 201, and the shape of the pins 201 is plate-shaped. The plate-shaped pins 201 improve the stability during soldering. The end of the winding 2 is fixed on the pins 201.

[0022] The housing 1 is provided with a wiring groove 202, such as Figure 3 There are four wiring channels 202, located at the four corners of the bottom of the housing 1.

[0023] After the two sets of windings 2 are wound around the magnetic core 101, the wire ends pass through the wiring groove 202 and are fixedly connected to the pin 201 by soldering.

[0024] By placing a magnetic plate 3 inside the magnetic core 101, the magnetic circuit asymmetry is increased, the differential mode component is enhanced, the common-differential mode rejection ratio is adjusted, the differential mode inductance is increased, and the differential mode rejection capability is ensured.

[0025] By changing the material of magnetic plate 3, such as composite materials, noise suppression frequency bands can also be customized. Magnetic plate 3 can also be designed in a cross shape to form a four-quadrant magnetic circuit.

[0026] Meanwhile, the design of separating pin 201 from the winding 2 on the magnetic core 101 through the side wall of the housing 1, during the soldering process between pin 201 and the PCB pad, physically isolates the coil through the housing 1, effectively avoiding the problem of coil burn.

[0027] like Figures 1-4 The four corners of the housing 1 are fixed with snap-fit ​​plates 4, that is, the housing 1 and the snap-fit ​​plates 4 are directly injection molded into one piece, which improves the mechanical impact resistance. The pins 201 are fixed at the bottom of the snap-fit ​​plates 4. The snap-fit ​​plates 4 are U-shaped and the snap-fit ​​plates 4 and the pins 201 are integrally formed.

[0028] The U-shaped snap-fit ​​plate 4 is fixedly connected to the housing 1, and then soldered through the integrated pin 201 at the bottom, which further improves the stability and prevents the pin 201 from accidentally shaking or even falling off.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A common-mode inductor, comprising a housing (1) and a magnetic core (101), wherein the magnetic core (101) is fixed within the housing (1), characterized in that, Two sets of windings (2) are wound on the magnetic core (101), and a magnetic plate (3) is provided inside the magnetic core (101). The outer wall of the housing (1) is fixedly connected with pins (201), and the end of the winding (2) is fixed on the pins (201); The four corners of the housing (1) are fixed with snap-fit ​​plates (4), and the pins (201) are fixed to the bottom of the snap-fit ​​plates (4).

2. The common-mode inductor according to claim 1, characterized in that, The magnetic plate (3) is made of ferrite or nanocrystalline alloy.

3. The common-mode inductor according to claim 1, characterized in that, The magnetic plate (3) is fixedly connected to the housing (1).

4. A common-mode inductor according to claim 1, characterized in that, The number of pins (201) is four.

5. A common-mode inductor according to claim 1, characterized in that, The pin (201) is in the shape of a sheet.

6. A common-mode inductor according to claim 4, characterized in that, The snap-fit ​​plate (4) is U-shaped.

7. A common-mode inductor according to claim 1, characterized in that, The snap-on plate (4) and the pin (201) are integrally formed.

8. A common-mode inductor according to claim 1, characterized in that, The housing (1) is provided with a wiring groove (202).

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