Common mode inductor

Abstract

The invention discloses a common mode inductor, and relates to the technical field of electronic magnetic element integration, the common mode inductor comprises a magnetic core and a winding, the winding is arranged on the magnetic core, a first magnetic sheet is arranged in the magnetic core, and a magnetic sheet structure is arranged on the outer side of the winding. According to the common-mode inductor, the magnetic field is increased through the first magnetic sheet and the magnetic sheet structure, and the purpose of improving leakage inductance is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of electronic magnetic component integration, and in particular to a common mode inductor. Background Art

[0002] With the widespread application of various power electronic devices, electromagnetic interference between different devices will cause noise, functional disorders, control failure and other problems. In order to reduce and eliminate the adverse effects of electromagnetic interference, various filtering devices are often used, among which common mode inductors and differential mode inductors have been widely used to remove common mode noise and differential mode noise in circuits.

[0003] In traditional circuits, in order to filter out common-mode noise and differential-mode noise, at least one common-mode inductor and at least one differential-mode inductor are usually required. Due to the trend of device miniaturization, differential-common-mode integrated inductors can use one inductor to filter out common-mode and differential-mode noise. The integration of this device can greatly reduce the size of the device, and at the same time can greatly reduce the use of supporting consumables. This solution has gradually been widely used.

[0004] The current differential-mode-common-mode integrated inductor is usually made of ferrite material. In order to enhance the anti-saturation characteristics of the differential-mode inductor, an air gap needs to be opened in the differential-mode inductor core. This type of solution involves the cutting, grinding, and subsequent installation of the core. The process is relatively complicated. In addition, due to the existence of the air gap, this solution will inevitably have a lot of leakage magnetic flux, and there is a disadvantage of introducing radiated electromagnetic interference, which is not conducive to improving the EMC (Electromagnetic Compatibility) effect. Summary of the invention

[0005] The purpose of the present invention is to provide a common mode inductor to solve the problems existing in the above-mentioned prior art and to achieve the purpose of improving leakage inductance.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a common mode inductor, comprising: a magnetic core and a winding, wherein the winding is arranged on the magnetic core, a first magnetic sheet is arranged inside the magnetic core, and a magnetic sheet structure is arranged outside the winding.

[0008] Preferably, the first magnetic sheet is arranged perpendicular to the end surface of the magnetic core.

[0009] Preferably, the magnetic sheet structure comprises a second magnetic sheet and a third magnetic sheet, and the second magnetic sheet and the third magnetic sheet are arranged opposite to each other.

[0010] Preferably, the second magnetic sheet and the third magnetic sheet are fixed by using a fixing structure.

[0011] Preferably, the first magnetic sheet is arranged perpendicularly to the second magnetic sheet and the third magnetic sheet respectively.

[0012] Preferably, the magnetic sheet structure also includes a fourth magnetic sheet, a fifth magnetic sheet, a sixth magnetic sheet and a seventh magnetic sheet, the fourth magnetic sheet and the fifth magnetic sheet are arranged opposite to each other, the sixth magnetic sheet and the seventh magnetic sheet are arranged opposite to each other, the second magnetic sheet, the third magnetic sheet, the fourth magnetic sheet, the fifth magnetic sheet, the sixth magnetic sheet and the seventh magnetic sheet form a rectangular shell, and the magnetic core and the winding are both located in the rectangular shell.

[0013] Preferably, the magnetic core is arranged on a bottom plate.

[0014] Preferably, the first magnetic sheet is a nanocrystalline magnetic sheet, and the magnetic sheet structure is made of nanocrystalline magnetic sheets.

[0015] Preferably, there are two windings, and the two windings are respectively arranged on both sides of the first magnetic sheet.

[0016] Preferably, the magnetic core is ring-shaped.

[0017] Compared with the prior art, the present invention has achieved the following technical effects:

[0018] The common-mode inductor of the present invention is provided with a first magnetic sheet and a magnetic sheet structure. Compared with a common-mode inductor without the first magnetic sheet and the magnetic sheet structure, the leakage inductance is improved, the electromagnetic compatibility is good, and it has good differential-mode noise and common-mode noise filtering performance, and can be widely used in the field of electromagnetic interference filtering. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is an axonometric diagram of a common mode inductor of the present invention;

[0021] Figure 2 A top view of the common mode inductor of the present invention;

[0022] Figure 3 It is a front view of the first magnetic sheet, magnetic core, winding and bottom plate of the present invention;

[0023] In the figure: 1-first magnetic sheet, 2-magnetic core, 3-winding, 4-bottom plate, 5-fixed structure, 6-second magnetic sheet, 7-third magnetic sheet. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The purpose of the present invention is to provide a common mode inductor to solve the problems existing in the above-mentioned prior art and to achieve the purpose of improving leakage inductance.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Embodiment 1

[0028] like Figures 1 to 3 As shown, this embodiment provides a common mode inductor, including: a magnetic core 2 and a winding 3, the winding 3 is arranged on the magnetic core 2, a first magnetic sheet 1 is arranged inside the magnetic core 2, and a magnetic sheet structure is arranged outside the winding 3. This embodiment uses the first magnetic sheet 1 and the magnetic sheet structure to increase the magnetic field, thereby achieving the purpose of improving the leakage inductance.

[0029] Specifically, in this embodiment, the first magnetic sheet 1 is a nanocrystalline magnetic sheet, the magnetic sheet structure is made of a nanocrystalline magnetic sheet, and the nanocrystalline magnetic sheet is made of a nanocrystalline soft magnetic material.

[0030] In this embodiment, the winding 3 is made of copper wire, there are two windings 3, and the two windings 3 are symmetrically arranged on both sides of the first magnetic sheet 1. The end faces of the first magnetic sheet 1 and the magnetic core 2 are perpendicularly arranged, and the first magnetic sheet 1 and the magnetic core 2 are fixed by glue.

[0031] In this embodiment, the magnetic core 2 is arranged on the base plate 4, and the magnetic core 2 and the winding 3 are respectively fixed to the base plate 4 by glue. The magnetic core 2 includes a magnetic ring and a protective box. The magnetic ring adopts a magnetic ring with high magnetic permeability. The protective box is arranged on the outside of the magnetic ring. The magnetic core 2 is ring-shaped, and the magnetic core 2 is a circular ring or a rectangular ring.

[0032] In this embodiment, the magnetic sheet structure includes a second magnetic sheet 6 and a third magnetic sheet 7, the second magnetic sheet 6 and the third magnetic sheet 7 are arranged opposite to each other, the first magnetic sheet 1 is arranged perpendicular to the second magnetic sheet 6 and the third magnetic sheet 7, respectively, the second magnetic sheet 6 and the third magnetic sheet 7 are fixed by a fixing structure 5, the fixing structure 5 is an insulating tape, and the second magnetic sheet 6 and the third magnetic sheet 7 are respectively fixed to the bottom plate 4 by glue.

[0033] The manufacturing method of the common mode inductor of this embodiment is as follows:

[0034] Step 1: Install the magnetic ring into the protective box to form the magnetic core 2, and evenly wind the copper wire on the magnetic core 2 as required to form the winding 3;

[0035] Step 2, fix the magnetic core 2 and the winding 3 on the bottom plate 4 and fix them with glue;

[0036] Step 3: Place the first magnetic sheet 1 into the center of the magnetic ring and fix it with glue;

[0037] Step 4: Cover both sides of the winding 3 with the second magnetic sheet 6 and the third magnetic sheet 7, and fix them with glue and insulating tape.

[0038] The device made by using the common-mode inductor of this embodiment has improved inductance leakage inductance, good electromagnetic compatibility, simple process, compact and stable structure, easier miniaturization, and cost saving.

[0039] The common-mode inductor of this embodiment is provided with a first magnetic sheet 1 and a magnetic sheet structure. Compared with the common-mode inductor without the first magnetic sheet 1 and the magnetic sheet structure, the leakage inductance is increased by 2-3 times, the electromagnetic compatibility is good, and it has good differential mode noise and common mode noise filtering performance, and can be widely used in the field of electromagnetic interference filtering.

[0040] Embodiment 2

[0041] The difference between this embodiment and the other one is that: in this embodiment, the magnetic sheet structure also includes a fourth magnetic sheet, a fifth magnetic sheet, a sixth magnetic sheet and a seventh magnetic sheet, the fourth magnetic sheet and the fifth magnetic sheet are arranged opposite to each other, the sixth magnetic sheet and the seventh magnetic sheet are arranged opposite to each other, the second magnetic sheet 6, the third magnetic sheet 7, the fourth magnetic sheet, the fifth magnetic sheet, the sixth magnetic sheet and the seventh magnetic sheet form a rectangular shell, and the magnetic core 2 and the winding 3 are both located in the rectangular shell.

[0042] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A common mode inductor, characterized in that: include: A magnetic core and a winding, wherein the winding is arranged on the magnetic core, a first magnetic sheet is arranged inside the magnetic core, and a magnetic sheet structure is arranged outside the winding.

2. The common mode inductor according to claim 1, characterized in that: The first magnetic sheet is arranged perpendicular to the end surface of the magnetic core.

3. The common mode inductor according to claim 1, characterized in that: The magnetic sheet structure includes a second magnetic sheet and a third magnetic sheet, and the second magnetic sheet and the third magnetic sheet are arranged opposite to each other.

4. The common mode inductor according to claim 3, characterized in that: The second magnetic sheet and the third magnetic sheet are fixed by using a fixing structure.

5. The common mode inductor according to claim 3, characterized in that: The first magnetic sheet is disposed perpendicularly to the second magnetic sheet and the third magnetic sheet respectively.

6. The common mode inductor according to claim 3, characterized in that: The magnetic sheet structure also includes a fourth magnetic sheet, a fifth magnetic sheet, a sixth magnetic sheet and a seventh magnetic sheet, the fourth magnetic sheet and the fifth magnetic sheet are arranged opposite to each other, the sixth magnetic sheet and the seventh magnetic sheet are arranged opposite to each other, the second magnetic sheet, the third magnetic sheet, the fourth magnetic sheet, the fifth magnetic sheet, the sixth magnetic sheet and the seventh magnetic sheet form a rectangular shell, and the magnetic core and the winding are both located in the rectangular shell.

7. The common mode inductor according to claim 1, characterized in that: The magnetic core is arranged on the bottom plate.

8. The common mode inductor according to claim 1, characterized in that: The first magnetic sheet is a nanocrystalline magnetic sheet, and the magnetic sheet structure is made of nanocrystalline magnetic sheets.

9. The common mode inductor according to claim 1, characterized in that: There are two windings, and the two windings are respectively arranged on two sides of the first magnetic sheet.

10. The common mode inductor according to claim 1, characterized in that: The magnetic core is ring-shaped.

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