High-frequency common-differential mode inductor

Abstract

The embodiment of the utility model discloses a high-frequency common-differential mode inductor, the high-frequency common-differential mode inductor comprises a magnetic cover, a first coil, a second coil, a magnetic seat and a bonding piece, the magnetic cover is provided with an installation space, the first coil and the second coil are sequentially stacked and installed in the installation space, the magnetic seat comprises a bottom and a side part connected with the bottom, the bottom is covered with the magnetic cover, and the bonding piece is arranged on the side part. The side part is connected with the side surface of the magnetic cover through the bonding piece, and the bonding piece is fixed on the side part and the side surface of the magnetic cover, so that the magnetic cover is tightly attached to the bottom, no air gap exists, the inductance value of the common-differential mode inductor is improved, the impedance is increased, the magnetic field leakage is reduced, the anti-interference capability is enhanced, and the filtering effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of inductors, in particular to a high-frequency common-mode differential-mode inductor. Background Art

[0002] With the popularization of Internet of Things technology, the promotion of intelligent vehicles and self-driving systems, and the continuous upgrading of technologies in the fields of industrial automation and intelligent manufacturing, common-mode inductors and differential-mode inductors play a crucial role in high-frequency signal processing.

[0003] Common-mode inductors are mainly used to suppress common-mode interference signals. In communication-related circuits, common-mode interference refers to interference signals that exist simultaneously on two signal lines and have the same direction. These interferences may come from external factors such as power supply noise and electromagnetic radiation. Common-mode noise will cause problems with EMC, resulting in signal distortion, increased energy consumption, damage or aging of internal components of the device, and a series of other effects. Common-mode inductors can effectively filter out these common-mode interference signals through their unique structure and electromagnetic induction principle, improving the stability of signal transmission and protecting electronic devices.

[0004] Differential-mode interference mainly refers to the interference between two signals, which is the difference between two signal lines. Differential-mode interference will cause problems such as increased bit error rate, decreased device performance, decreased system stability, data loss, and communication interruption.

[0005] Usually, common-mode inductors and differential-mode inductors both appear in EMC circuits at the same time. However, with the upgrading of technology, the requirements for the structure and size of products have almost become extremely strict. With the advent of the era of high power density, PCBs are subject to strict size limitations. In some applications, it is difficult to achieve a more compact structural design for EMC circuits that simultaneously use common-mode inductors and differential-mode inductors. Therefore, it is necessary to integrate the common-mode inductor and the differential-mode inductor into one inductor through magnetic integration, which can not only process common-mode signals but also process differential-mode signals, meeting the design requirements of minimizing size and maximizing power density.

[0006] However, existing common-mode differential-mode inductors usually have a structure of a magnetic cover and a flat magnetic base. Epoxy resin is used for bonding on the functional surfaces of the magnetic cover and the flat magnetic base to form a closed magnetic circuit. This method will generate a certain small air gap at the joint. At room temperature, the accuracy of the inductance value can be guaranteed. However, as the temperature rises, due to the expansion coefficient of epoxy resin, when the temperature rises to a certain extent, the epoxy resin expands, causing the air gap to increase, the inductance value to decay rapidly, and the impedance to decrease accordingly, affecting the filtering effect. Summary of the Utility Model

[0007] Based on this, it is necessary to provide a high-frequency common-mode differential-mode inductor, aiming to solve the technical problem that the existing common-mode differential-mode inductors usually have a structure of a magnetic cover and a flat magnetic base, and epoxy resin is used for bonding on the functional surfaces of the magnetic cover and the flat magnetic base to form a closed magnetic circuit. In this way, a certain small air gap will be generated at the joint. At room temperature, the accuracy of the inductance value can be guaranteed. However, as the temperature rises, due to the expansion coefficient of epoxy resin, when the temperature rises to a certain extent, the epoxy resin expands, resulting in an increase in the air gap, and the inductance value will decay sharply, and the impedance will also become smaller, affecting the filtering effect.

[0008] The utility model provides a high-frequency common-mode differential-mode inductor. The high-frequency common-mode differential-mode inductor includes a magnetic cover, a first coil, a second coil, a magnetic base, and a bonding member. The magnetic cover is provided with an installation space. The first coil and the second coil are sequentially stacked and installed in the installation space. The magnetic base includes a bottom and a side connected to the bottom. The bottom covers the magnetic cover, and the side is connected to the side surface of the magnetic cover through the bonding member.

[0009] In one embodiment, a polarity mark is provided on one side of the magnetic cover, and the polarity mark is used to identify the installation direction of the inductor.

[0010] In one embodiment, the high-frequency common-mode differential-mode inductor further includes a middle column. The middle column is installed in the installation space, and the first coil and the second coil are sleeved on the middle column.

[0011] In one embodiment, the middle column is rectangular.

[0012] In one embodiment, the high-frequency common-mode differential-mode inductor further includes an isolation sheet. The isolation sheet is sleeved on the middle column and is arranged between the first coil and the second coil.

[0013] In one embodiment, both the first coil and the second coil have a structure of flat wire wound flat.

[0014] In one embodiment, the first coil includes a first body and two first leads connected to the first body. The second coil includes a second body and two second leads connected to the second body. The two first leads are arranged oppositely, and the two second leads are arranged oppositely.

[0015] In one embodiment, the magnetic cover is provided with a wire outlet groove, and the wire outlet groove is used to lead out the first lead and the second lead.

[0016] In one embodiment, the side is provided with a lead wire groove, and the lead wire groove is used to lead out the first lead and the second lead.

[0017] In one of the embodiments, an electrode groove communicating with the lead groove is provided at the bottom, and the first pin and the second pin are bent and arranged in the electrode groove to form an electrode.

[0018] Implementing the embodiments of the present invention will have the following beneficial effects:

[0019] By using the high-frequency common-mode and differential-mode inductor of the present invention, an installation space is provided in the magnetic cover of the high-frequency common-mode and differential-mode inductor, and the first coil and the second coil are sequentially stacked and installed in the installation space. The magnetic base includes a bottom and a side connected to the bottom. The bottom covers the magnetic cover, and the side is connected to the side surface of the magnetic cover through an adhesive. By fixing the adhesive on the side and the side surface of the magnetic cover, the magnetic cover is closely attached to the bottom without an air gap, the inductance value of the common-mode and differential-mode inductor is increased, the impedance becomes larger, the magnetic field leakage is reduced, the anti-interference ability is enhanced, and the filtering effect is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Among them:

[0022] Figure 1 FIG. 18 is a first isometric schematic diagram of a high-frequency common-mode and differential-mode inductor in an embodiment.

[0023] Figure 2 is Figure 1 a second isometric schematic diagram of the high-frequency common-mode and differential-mode inductor shown in FIG.

[0024] Figure 3 is Figure 1 an exploded schematic diagram of the high-frequency common-mode and differential-mode inductor shown in FIG.

[0025] Figure 4 is Figure 3 a schematic diagram of the magnetic cover and the middle column of the high-frequency common-mode and differential-mode inductor shown in FIG.

[0026] Figure 5 is Figure 3 a first schematic diagram of the magnetic base of the high-frequency common-mode and differential-mode inductor shown in FIG.

[0027] Figure 6 is Figure 3 a second schematic diagram of the magnetic base of the high-frequency common-mode and differential-mode inductor shown in FIG.

[0028] Reference numerals:

[0029] 1. Magnetic cover; 11. Installation space; 12. Polarity mark; 13. Wire outlet groove;

[0030] 2. First coil; 21. First body; 22. First pin;

[0031] 3. Second coil; 31. Second body; 32. Second pin;

[0032] 4. Magnetic base; 41. Bottom; 411. Electrode groove; 42. Side; 421. Lead groove; 5. Adhesive; 6. Central column; 7. Isolation sheet. Detailed implementation manner

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0035] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0036] In addition, if terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0037] It should be noted that, without conflict, the features in the embodiments of the present invention can be combined with each other.

[0038] Please also refer to Figures 1 to 6 to illustrate the high-frequency common-mode differential inductor provided by the present invention.

[0039] The high-frequency common-mode / differential-mode inductor includes a magnetic cover 1, a first coil 2, a second coil 3, a magnetic base 4, and an adhesive 5. The magnetic cover 1 is provided with an installation space 11. The first coil 2 and the second coil 3 are sequentially stacked and installed in the installation space 11. The magnetic base 4 includes a bottom 41 and a side portion 42 connected to the bottom 41. The bottom 41 covers the magnetic cover 1, and the side portion 42 is connected to the side surface of the magnetic cover 1 through the adhesive 5. Specifically, the adhesive 5 can be magnetic glue, or thermosetting epoxy resin (non-magnetic), or self-drying AB glue, or UV glue according to actual requirements.

[0040] It can be understood that the magnetic cover 1 of the high-frequency common-mode / differential-mode inductor is provided with an installation space 11. The first coil 2 and the second coil 3 are sequentially stacked and installed in the installation space 11. The magnetic base 4 includes a bottom 41 and a side portion 42 connected to the bottom 41. The bottom 41 covers the magnetic cover 1, and the side portion 42 is connected to the side surface of the magnetic cover 1 through the adhesive 5. By fixing the adhesive 5 on the side portion 42 and the side surface of the magnetic cover 1, the magnetic cover 1 and the bottom 41 are closely fitted without air gaps, the inductance value of the common-mode / differential-mode inductor is increased, the impedance becomes larger, the magnetic field leakage is reduced, the anti-interference ability is enhanced, and the filtering effect is improved.

[0041] It should be added that a plurality of adhesives 5 are provided and are respectively distributed at the four corners or the four sides of the magnetic cover 1. This avoids the attenuation of the inductance value caused by the change of the glue expansion coefficient of the inductor in a high-temperature environment, improves the reliability of the product, and adapts to the application of more solutions in harsh environments.

[0042] It should be noted that the magnetic cover 1 can be rectangular or polygonal. The material of the magnetic cover 1 can be nickel-zinc material, or manganese-zinc material or other magnetic powder core soft magnetic materials can be selected according to different requirements. The magnetic base 4 can be rectangular or polygonal. The material of the magnetic base 4 can be nickel-zinc material, or manganese-zinc material or other magnetic powder core soft magnetic materials can be selected according to different requirements.

[0043] Of course, in other embodiments, the side portion 42 and the side surface of the magnetic cover 1 are in interference fit, so that the magnetic cover 1 and the base are buckled. This reduces the investment in assembly positioning jigs, simplifies the production process of the inductor, and improves the production efficiency.

[0044] In this embodiment, a polarity mark 12 is provided on one side of the magnetic cover 1. The polarity mark 12 is used to identify the installation direction of the inductor. Specifically, the polarity mark 12 can be a mark formed by a protrusion or a groove, which is used to prevent the wrong installation of the inductor.

[0045] In one embodiment, as Figure 3 and Figure 4As shown, the high-frequency common-mode differential-mode inductor further includes a middle column 6. The middle column 6 is installed in the installation space 11, and the first coil 2 and the second coil 3 are sleeved on the middle column 6. By setting the middle column 6, the installation positions of the first coil 2 and the second coil 3 in the installation space 11 can be positioned.

[0046] In this embodiment, the middle column 6 is rectangular and can also be polygonal. The rectangular middle column 6 can further compress the height of the inductor and improve the installation space 11. In addition, the design of the rectangular middle column 6 increases the effective cross-sectional area of the magnetic core, improves the anti-saturation ability of the inductor, allows the differential-mode inductor to withstand larger peak currents without saturation, and thus ensures stable filtering of differential-mode noise.

[0047] Furthermore, the high-frequency common-mode differential-mode inductor further includes an isolation sheet 7. The isolation sheet 7 is sleeved on the middle column 6 and is arranged between the first coil 2 and the second coil 3. Specifically, by setting the rectangular middle column 6 and the rectangular isolation sheet 7, good positioning between the isolation sheet 7 and the magnetic cover 1 is obtained, the spacing is controlled, and the inductance accuracy is greatly improved.

[0048] The isolation sheet 7 can be made of nickel-zinc material, or manganese-zinc ferrite or other magnetic powder core soft magnetic materials can be selected according to different requirements. Ceramic or polyesterimide and other high-temperature non-magnetic insulating materials can also be selected according to needs.

[0049] In one embodiment, as Figure 3 shown, both the first coil 2 and the second coil 3 are of a flat wire flat-wound structure. By adopting the flat wire flat-wound (mosquito coil shape) method, the first coil 2 and the second coil 3 are respectively divided into two sections, which can respectively reduce the distributed capacitance of the first coil 2 and the second coil 3, improve the Q value of the inductor, reduce the loss, and at the same time can effectively improve the inherent resonance frequency of the inductor to adapt to high-frequency signal processing.

[0050] In this embodiment, the first coil 2 includes a first body 21 and two first pins 22 connected to the first body 21. The second coil 3 includes a second body 31 and two second pins 32 connected to the second body 31. The two first pins 22 of the first coil 2 are arranged oppositely, and the two second pins 32 of the second coil 3 are arranged oppositely. The differentiation of the lead-out methods of the two first pins 22 of the first coil 2 and the two second pins 32 of the second coil 3 integrates the common mode and the differential mode. When the common-mode signal passes through the inductor, the magnetic fields of the first coil 2 and the second coil 3 are superimposed, generating a large impedance to effectively suppress the common-mode interference. When the differential-mode signals with opposite directions pass through the inductor, due to the differentiation of the lead-out methods of the first coil 2 and the second coil 3, the inductance values on both sides are not completely cancelled out, and a small inductor is still retained inside the inductor to continue attenuating the differential-mode signal, so as to achieve the effect of simultaneously suppressing the common-mode and differential-mode signals. In some circuit topologies, the differential-mode inductor can be directly omitted to achieve a higher power density and smaller size design.

[0051] In one embodiment, as Figure 4 shown, the magnetic cover 1 is provided with a wire outlet groove 13 for leading out the first pin 22 and the second pin 32. In this way, the first pin 22 and the second pin 32 can be led out from the wire outlet groove.

[0052] In one embodiment, as Figure 5 and Figure 6 shown, the side part 42 is provided with a lead wire groove 421 for leading out the first pin 22 and the second pin 32. In this way, the first pin 22 and the second pin 32 can be led out from the lead wire groove 421, avoiding interference of the side part 42 on the first pin 22 and the second pin 32.

[0053] In this embodiment, the bottom 41 is provided with an electrode groove 411 communicating with the lead wire groove 421. The first pin 22 and the second pin 32 are bent and arranged in the electrode groove 411 to form an electrode. The electrode groove 411 adopts an inclined manner, avoiding the rebound amplitude after the coil pins are bent and ensuring the coplanarity consistency of the inductor.

[0054] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brief description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0055] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A high-frequency common-mode and differential-mode inductor, characterized in that, The high-frequency common-mode differential-mode inductor includes a magnetic cover, a first coil, a second coil, a magnetic base, and an adhesive. The magnetic cover is provided with an installation space. The first coil and the second coil are sequentially stacked and installed in the installation space. The magnetic base includes a bottom and a side connected to the bottom. The bottom covers the magnetic cover, and the side is connected to the side surface of the magnetic cover through the adhesive.

2. The high-frequency common-differential mode inductor according to claim 1, wherein One side of the magnetic cover is provided with a polarity mark, and the polarity mark is used to identify the installation direction of the inductor.

3. The high-frequency common-mode differential-mode inductor according to claim 1, wherein The high-frequency common-mode differential-mode inductor further includes a middle column. The middle column is installed in the installation space, and the first coil and the second coil are sleeved on the middle column.

4. The high-frequency common-differential mode inductor according to claim 3, wherein The middle column is rectangular.

5. The high-frequency common-differential mode inductor according to claim 3, wherein The high-frequency common-mode differential-mode inductor further includes an isolation sheet. The isolation sheet is sleeved on the middle column and is arranged between the first coil and the second coil.

6. The high-frequency common-differential-mode inductor according to claim 1, wherein Both the first coil and the second coil are of a structure of flat wire wound flat.

7. The high-frequency common-differential mode inductor according to claim 1, wherein The first coil includes a first body and two first leads connected to the first body. The second coil includes a second body and two second leads connected to the second body. The two first leads are arranged oppositely, and the two second leads are arranged oppositely.

8. The high-frequency common-mode differential-mode inductor according to claim 7, characterized in that, The magnetic cover is provided with a wire outlet groove, and the wire outlet groove is used to lead out the first lead and the second lead.

9. The high-frequency common-differential mode inductor according to claim 7, wherein The side is provided with a lead wire groove, and the lead wire groove is used to lead out the first lead and the second lead.

10. The high-frequency common-mode differential-mode inductor according to claim 9, characterized in that The bottom is provided with an electrode groove communicated with the lead wire groove. The first lead and the second lead are bent and arranged in the electrode groove to form an electrode.

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