High-frequency inductor with common and differential mode

Abstract

A high-frequency inductor with common and differential mode, characterized in that the high-frequency inductor with common and differential mode comprises a magnetic cover, a first coil, a second coil, a magnetic seat and an adhesive element, wherein the magnetic cover is provided with an installation space, and wherein the first coil and the second coil are stacked sequentially in the installation space, and wherein the magnetic seat comprises a base and a side part connected to the base, and wherein the base covers the magnetic cover, and wherein the side part is connected to a side surface of the magnetic cover by the adhesive element.

Description

TECHNICAL FIELD

[0001] The present utility model relates to the technical field of inductors, in particular a high-frequency inductor with common and differential mode. STATE OF THE ART

[0002] With the proliferation of Internet of Things technology, the advancement of smart cars and self-driving systems, and the continuous updates in the fields of industrial automation and intelligent manufacturing, common mode inductors and differential mode inductors play an important role in high frequency signal processing.

[0003] Common-mode inductors are primarily used to suppress common-mode interference. In communication-related circuits, common-mode interference refers to interference that exists simultaneously on the lines of two models and has the same direction. This interference can originate from power supply noise, electromagnetic radiation, and other external factors. Common-mode noise can cause EMC problems, leading to signal distortion, increased power consumption, damage or aging of internal device components, and a variety of other effects. Common-mode inductors, through their unique structure and the principle of electromagnetic induction, can effectively filter out these common-mode interference signals, improve signal transmission stability, and protect electronic devices.

[0004] Differential mode interference mainly refers to the interference between two signals, that is, the difference between the two signal lines. Differential mode interference leads to an increase in BER, degradation of device performance, impact on system stability, data loss, communication interruption, and other hazards.

[0005] Typically, EMC circuits contain both common-mode and differential-mode inductors, but with the advancement of technology, the requirements for product structure and size are becoming almost too high. With the advent of high power densities, printed circuit boards are subject to strict size limitations, and in some applications, it is difficult to achieve a more compact design for EMC circuits that simultaneously use common-mode and differential-mode inductors. Therefore, it is necessary to combine the common-mode and differential-mode inductors into one inductor through magnetic integration, which can handle both common-mode and differential-mode signals, to minimize size requirements and increase power density.

[0006] However, the existing common and differential mode inductor usually has the structure of a magnetic cover and a flat magnetic seat, and epoxy resin is used to connect the functional surfaces of the magnetic cover and the flat magnetic seat to form a closed magnetic circuit, and in this way, a certain small air gap is created at the junction, and the accuracy of the inductance value can be guaranteed at room temperature, but with the rise of temperature, the epoxy resin will expand due to the expansion coefficient of the epoxy resin. When the temperature rises to a certain level, the epoxy resin will expand and cause the air gap to increase, the inductance value will be greatly attenuated, and the impedance will also become smaller, which will affect the filtering effect. CONTENTS OF THE PRESENT UTILITY MODEL

[0007] Based on this, there is a need to provide a high-frequency common and differential mode inductor to solve the technical problems that the existing common and differential mode inductor usually has the structure of a magnetic cover and a flat magnetic seat, where epoxy resin is used to connect the functional surfaces of the magnetic cover and the flat magnetic seat to form a closed magnetic circuit, and in this way, a certain small air gap is created at the junction and the accuracy of the inductance value at room temperature can be guaranteed, while with the increase in temperature, the epoxy resin expands due to the expansion coefficient of the epoxy resin, and the expansion of the epoxy resin causes an increase in the air gap when the temperature rises to a certain level,and the inductance value is greatly attenuated and the impedance also becomes smaller, which impairs the filter effect.

[0008] The present utility model provides a high-frequency common and differential mode inductor comprising a magnetic cover, a first coil, a second coil, a magnetic seat, and an adhesive member, wherein the magnetic cover is provided with an installation space, and wherein the first coil and the second coil are sequentially stacked and mounted in the installation space, and wherein the magnetic seat includes a bottom and a side part connected to the bottom, and wherein the bottom covers the magnetic cover, and wherein the side part is connected to a side surface of the magnetic cover by the adhesive member.

[0009] In one embodiment, one side of the magnetic cover is provided with a polarity marking, wherein the polarity marking is used to identify the mounting direction of the inductor.

[0010] In one embodiment, the high-frequency common and differential mode inductor further comprises a center post mounted in the installation space, and wherein the first coil and the second coil are mounted on the center post.

[0011] In one embodiment, the center post is rectangular.

[0012] In one embodiment, the high frequency common and differential mode inductor further comprises a spacer mounted on the center post and disposed between the first coil and the second coil.

[0013] In one embodiment, the first coil and the second coil are each a flat wound structure with flat wire.

[0014] In one embodiment, the first coil comprises a first base body and two first pins connected to the first base body, wherein the second coil comprises a second base body and two second pins connected to the second base body, and wherein the two first pins are arranged opposite one another and the two second pins are arranged opposite one another.

[0015] In one embodiment, the magnetic cover is provided with an outlet slot used to lead out the first pins and the second pins.

[0016] In one embodiment, the side part is provided with a cable slot that is used to lead out the first pins and the second pins.

[0017] In one embodiment, the bottom is provided with an electrode slot communicating with the conduction slot, wherein the first pins and the second pins are bently arranged in the electrode slot to form an electrode.

[0018] The implementation of the embodiment of the present utility model has the following advantageous effects: A high-frequency common-mode and differential-mode inductor according to the present utility model is used. The magnetic cover of the high-frequency common-mode and differential-mode inductor is provided with an installation space. The first coil and the second coil are stacked one after the other in the installation space. The magnetic seat includes a bottom and a side piece connected to the bottom. The bottom covers the magnetic cover. The side piece is connected to a side surface of the magnetic cover by an adhesive element. By attaching the adhesive element to the side piece and a side surface of the magnetic cover, the magnetic cover fits tightly against the bottom without an air gap. This improves the inductance value of the common-mode and differential-mode inductor, increases the impedance, and reduces magnetic field leakage.improves the anti-interference ability and improves the filtering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly explain the technical solutions in the embodiments of the present utility model or in the prior art, the figures to be used in the explanation of the embodiments or the prior art are briefly presented below. Obviously, the figures described below show only some embodiments of the present utility model. A person of ordinary skill in the art can obtain the structures illustrated in these attached drawings without any creative work.

[0020] Below shows: Fig. 1 is a first axonometric schematic diagram of a high frequency inductor with common and differential mode in one embodiment; Fig. 2 a second axonometric schematic diagram of a high-frequency inductor with common and differential mode according to Fig. 1; Fig. 3 is a schematic exploded view of a high frequency inductor with common and differential mode according to Fig. 1; Fig. 4 a schematic diagram of a magnetic cover and a center post of the high frequency inductor with common and differential mode according to Fig. 3; Fig. 5 a first schematic diagram of a magnetic seat of the high frequency inductor with common and differential mode according to Fig. 3; and Fig. 6 a second schematic diagram of a magnetic seat of the high frequency inductor with common and differential mode according to Fig. 3. List of reference symbols 1 Magnetic Cover 11 Installation room 12 Polarity marking 13 Outlet slot 2 First coil 21 First basic body 22 First pin 3 Second coil 31 Second basic body 32 Second pin 4 Magnetic seat 41 Floor 411 Electrode slot 42 side panel 421 cable slot 5 adhesive element 6 center posts 7 spacers DETAILED DESCRIPTION

[0021] In conjunction with the figures in the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model are explained clearly and completely below. Obviously, the explained embodiments do not represent all embodiments, but only a part of the embodiments of the present utility model. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present utility model without creative work should be considered to be covered by the scope of protection of the present utility model.

[0022] It should be noted that similar reference symbols and alphabets do not represent similar elements, if an element is defined in one attached drawing, there is no need to further define and explain the item in further attached drawings.

[0023] It should be noted that in the explanation of the present utility model, the directional or positional relationships with terms such as "top," "bottom," "inside," "outside," etc., are based on the directional or positional relationships shown in the figures, or represent the directional or positional relationships with which the product of the utility model is normally placed. They are provided only to explain the present utility model and to facilitate explanation. They do not show or imply that the illustrated devices or elements have specific directions or should be constructed and operated in specific directions. Therefore, they cannot be understood as limiting the present utility model.

[0024] Furthermore, the terms “the first” and “the second” are used only to explain the purpose and cannot be understood to indicate or imply relative importance.

[0025] It should be noted that the features in the embodiments of the present utility model can be combined with each other in the case of no conflicts.

[0026] In combination with Fig. 1 to 6, a high-frequency common and differential mode inductor provided by the present utility model is explained.

[0027] The high-frequency common-mode and differential-mode inductor comprises a magnetic cover 1, a first coil 2, a second coil 3, a magnetic seat 4, and an adhesive member 5. The magnetic cover 1 is provided with an installation space 11, and the first coil 2 and the second coil 3 are stacked one after another in the installation space 11. The magnetic seat 4 includes a bottom 41 and a side member 42 connected to the bottom 41. The bottom 41 covers the magnetic cover 1, and the side member 42 is connected to a side surface of the magnetic cover 1 by the adhesive member 5. Specifically, the adhesive member 5 can be a magnetic adhesive, a thermosetting epoxy resin (without magnetism), a self-drying AB adhesive, or a UV adhesive, depending on the actual needs.

[0028] It is understood that the magnetic cover 1 of the high-frequency common-differential mode inductor is provided with an installation space 11, wherein the first coil 2 and the second coil 3 are mounted in a stacked manner in the installation space 11, and wherein the magnetic seat 4 comprises a bottom 41 and a side part 42 connected to the bottom 41, and wherein the bottom 41 covers the magnetic cover, and wherein the side part 42 is connected to a side surface of the magnetic cover 1 by the adhesive member 5, and wherein, by attaching the adhesive member 5 to the side part 42 and a side surface of the magnetic cover 1, the magnetic cover 1 fits tightly against the bottom 41 without having the air gap, thereby improving the inductance value of the common-differential mode inductor, increasing the impedance, and reducing the magnetic field leakage,improves the anti-interference ability and improves the filtering effect.

[0029] It should be added that the adhesive elements 5 are provided in a number of 5 and are distributed at four corners or four edges of the magnetic cover 1, respectively. This avoids the attenuation of the inductance value caused by the change in the expansion coefficient of the adhesive in the high-temperature environment and improves the reliability of the product to adapt to application in harsher environments.

[0030] 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, manganese-zinc material, or other soft magnetic material with a powder core, which can be selected as needed. The magnetic seat 4 can be rectangular or polygonal. The material of the magnetic seat 4 can be nickel-zinc material, manganese-zinc material, or other soft magnetic material with a powder core, which can be selected as needed.

[0031] Of course, in other embodiments, the side part 42 has a press fit with the side surface of the magnetic cover 1, so that the magnetic cover 1 snaps into the seat. The assembly effort of the positioning device is reduced, the production process of the inductor is simplified, and production efficiency is improved.

[0032] In the present embodiment, one side of the magnetic cover 1 is provided with a polarity marking 12. The polarity marking 12 is used to identify the mounting direction of the inductor. The polarity marking 12 may, in particular, be a marking formed by a bump or a groove to prevent the inductor from being installed incorrectly.

[0033] In an embodiment, as in Fig. 3 and Fig. As shown in Figure 4, the high-frequency common-differential mode inductor further includes a center post 6 mounted in the installation space 11, with the first coil 2 and the second coil 3 mounted on the center post 6. With the arrangement of the center post 6, the installation positions of the first coil 2 and the second coil 3 in the installation space 11 can be fixed.

[0034] In one embodiment, the center post 6 is rectangular; however, it may also be polygonal. The rectangular center post 6 allows the height of the inductor to be further compressed to increase the installation space 11. Furthermore, the design of the rectangular center post 6 increases the effective cross-sectional area of ​​the magnetic core and improves the anti-saturation capability of the inductor, allowing the differential mode inductor to withstand a larger peak current without saturating, thus ensuring stable differential mode noise filtering.

[0035] Furthermore, the high-frequency common-differential mode inductor further includes a spacer 7 mounted on the center post 6 and disposed between the first coil 2 and the second coil 3. Specifically, with the arrangement of a rectangular center post 6 and a rectangular spacer 7, excellent positioning between the spacer 7 and the magnetic cover 1 is realized, the clearance is controlled, and the inductance accuracy is significantly improved.

[0036] Spacer 7 can be made of nickel-zinc or manganese-zinc ferrite, or other soft magnetic powder core materials, which can be selected as needed. High-temperature-resistant non-magnetic insulating materials such as ceramic or polyesterimide can also be selected as needed.

[0037] In an embodiment, as in Fig. As shown in Figure 3, the first coil 2 and the second coil 3 each have a flat-wire flat-winding structure. By using the flat-wire flat-winding method (in the form of an incense coil for repelling mosquitoes), the first coil 2 and the second coil 3 are each divided into two segments, which can reduce the respective capacitance of the first coil 2 and the second coil 3, increase the Q value of the inductor, and reduce loss. At the same time, the self-resonance frequency of the inductor can be effectively increased to adapt to high-frequency signal processing.

[0038] In the present embodiment, the first coil 2 comprises a first base body 21 and two first pins 22 connected to the first base body 21, and the second coil 3 comprises a second base body 31 and two second pins 32 connected to the second base body 31, and the two first pins 22 are arranged opposite each other and the two second pins 32 are arranged opposite each other. The differentiation of the two first pins 22 of the first coil 2 and the two second pins 32 of the second coil 3 in the manner of outgoing wires integrates the common mode and the differential mode, and the magnetic fields of the first coil 2 and the second coil 3 are superimposed when the common mode signal passes through the inductor, thereby generating a larger impedance to achieve effective suppression of the common mode noise.When differential mode signals with opposite direction pass through the inductor, due to the differentiation of the discharge method of the first coil 2 and the second coil 3, the inductance value of the two sides is not completely canceled, and a small inductance is still maintained inside the inductor to continue to attenuate the differential mode signal, thereby achieving the effect of simultaneously suppressing the common mode and differential mode signals, and the differential mode inductor can be directly omitted in certain circuit topologies to achieve higher power density and a smaller size design.

[0039] In an embodiment, as in Fig. As shown in Figure 4, the magnetic cover 1 is provided with an outlet slot 13 used to guide the first pins 22 and the second pins 32 out. This allows the first pins 22 and the second pins 32 to be guided out of the outlet slot.

[0040] In an embodiment, as in Fig. 5 and Fig. As shown in Figure 6, the side member 42 is provided with a lead slot 421 used to lead out the first pins 22 and the second pins 32. This allows the first pins 22 and the second pins 32 to be led out of the lead slot 421 to prevent the side member 42 from interfering with the first pins 22 and the second pins 32.

[0041] In the present embodiment, the base 41 is provided with an electrode slot 411 that communicates with the lead slot 421. The first pins 22 and the second pins 32 are bently arranged in the electrode slot 411 to form an electrode. The electrode slot 411 is inclined to prevent the coil pins from bouncing back after bending and to ensure the consistent coplanarity of the inductor.

[0042] The respective technical features of the above embodiments can be combined arbitrarily. To simplify the explanation, not all possible combinations of the respective technical features in the above embodiments are explained. However, the combinations of the technical features shall be considered to be within the scope of the description in the case of no conflicts.

[0043] Only preferred embodiments of the present utility model are disclosed above, of course the scope of the rights of the present utility model may be limited thereto, therefore the equivalent changes made according to the claims of the present utility model should be considered to be covered by the scope of protection of the present utility model.

Claims

[1] High frequency inductor with common and differential mode, characterized by that the high-frequency common and differential mode inductor comprises a magnetic cover, a first coil, a second coil, a magnetic seat and an adhesive member, wherein the magnetic cover is provided with an installation space, and wherein the first coil and the second coil are sequentially stacked and mounted in the installation space, and wherein the magnetic seat comprises a bottom and a side part connected to the bottom, and wherein the bottom covers the magnetic cover, and wherein the side part is connected to a side surface of the magnetic cover by the adhesive member. [2] High frequency common and differential mode inductor according to claim 1, characterized bythat one side of the magnetic cover is provided with a polarity marking, the polarity marking being used to identify the mounting direction of the inductor. [3] High frequency common and differential mode inductor according to claim 1, characterized by that the high-frequency common and differential mode inductor further comprises a center post mounted in the installation space, wherein the first coil and the second coil are mounted on the center post. [4] High frequency common and differential mode inductor according to claim 3, characterized by that the central post is rectangular. [5] High frequency common and differential mode inductor according to claim 3, characterized bythat the high-frequency common and differential mode inductor further comprises a spacer mounted on the center post and disposed between the first coil and the second coil. [6] High frequency common and differential mode inductor according to claim 1, characterized by that the first coil and the second coil are each a flat wound structure with flat wire. [7] High frequency common and differential mode inductor according to claim 1, characterized by in that the first coil comprises a first base body and two first pins connected to the first base body, wherein the second coil comprises a second base body and two second pins connected to the second base body, and wherein the two first pins are arranged opposite one another and the two second pins are arranged opposite one another. [8] High frequency common and differential mode inductor according to claim 7, characterized by that the magnetic cover is provided with an outlet slot which is used to guide out the first pins and the second pins. [9] High frequency common and differential mode inductor according to claim 7, characterized by that the side part is provided with a cable slot which is used to lead out the first pins and the second pins. [10] High frequency common and differential mode inductor according to claim 9, characterized by that the bottom is provided with an electrode slot which is in communication with the conduction slot, wherein the first pins and the second pins are bently arranged in the electrode slot to form an electrode.

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