Amorphous common mode inductor

Abstract

The utility model discloses an amorphous common mode inductor which comprises an annular magnetic core, a primary coil and a secondary coil, the primary coil is wound on the left side of the annular magnetic core, the secondary coil is wound on the right side of the annular magnetic core, the annular magnetic core is made of iron-based amorphous alloy, and the primary coil or the secondary coil is made of ferrite nanocrystalline. The stray magnetic field of the magnetic core is reduced by the annular magnetic core, so that magnetic lines are more concentrated, and the magnetic density is increased; the annular magnetic core has no air gap, the magnetic conduction rate of the amorphous common mode inductor is improved, the turn-to-turn capacitance of the coil is reduced, the frequency band is broadened, the ferrite nanocrystalline material adopted by the primary coil or the secondary coil has extremely high magnetic conductivity and working frequency, the magnetic conductivity is also very small along with the change of magnetic flux density and temperature, and the working efficiency is greatly improved. According to the amorphous common-mode inductor, large inductance can be obtained with a small number of turns of the coil, the size and weight of the inductor are reduced, common-mode interference can be restrained within a wide frequency range, and the anti-electromagnetic interference performance of the amorphous common-mode inductor is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of common mode inductor, especially a kind of amorphous common mode inductor. BACKGROUND

[0002] With the development of electronic products towards miniaturization, high frequency, electromagnetic interference noise problem in switching power supply is increasingly serious, and the traditional common mode inductor has certain limitations in inhibiting high-frequency common mode noise. As a key component for inhibiting electromagnetic interference noise in switching power supply, the characteristics of common mode inductor have a significant impact on noise suppression capability.

[0003] The magnetic core of traditional common mode inductor is usually made of silicon steel sheet or ferrite material, which has low cost, but low saturation magnetic induction intensity, narrow adjustment range, poor temperature stability, and complex structure, inconvenient installation and easy to be damaged by collision, which affects the electromagnetic interference performance and magnetic flux density. SUMMARY

[0004] The utility model embodiment provides a kind of amorphous common mode inductor to solve the problem of low magnetic flux density and poor electromagnetic interference performance of existing common mode inductor.

[0005] To achieve the above purpose, in one embodiment, an amorphous common mode inductor is provided, comprising: a toroidal core, a primary coil and a secondary coil, the primary coil is wound on the left side of the toroidal core, and the secondary coil is wound on the right side of the toroidal core, wherein the material of the toroidal core is iron-based amorphous alloy, and the material of the primary coil or the secondary coil is ferrite nanocrystalline.

[0006] In one embodiment, it further comprises: a base, the base is provided with a primary coil positioning hole and a secondary coil positioning hole, the primary coil is led out through the primary coil positioning hole, and the secondary coil is led out through the secondary coil positioning hole.

[0007] In one embodiment, the toroidal core bottom is provided with a glue layer, and the glue layer is used to fix the toroidal core to the base.

[0008] In one embodiment, it further comprises: an epoxy plate, one end of the epoxy plate is fixed to the top of the inner diameter of the toroidal core, the other end of the epoxy plate is fixed to the bottom of the inner diameter of the toroidal core, the epoxy plate is used to isolate the current path between the primary coil and the secondary coil, and the epoxy plate is also used to provide rigid support for the primary coil and the secondary coil of the common mode inductor.

[0009] In an embodiment, the primary coil positioning hole comprises: a first primary coil positioning hole and a second primary coil positioning hole, wherein the first primary coil positioning hole is located at the upper left corner of the base, the first primary coil positioning hole is 7.5-8.5mm away from the left side edge of the base, and the first primary coil positioning hole is 2-3mm away from the top side of the base.

[0010] The second primary coil positioning hole is located at the lower left corner of the base, the second primary coil positioning hole is 7.5-8.5mm away from the left side edge of the base, and the second primary coil positioning hole is 2-3mm away from the bottom side of the base.

[0011] In an embodiment, the secondary coil positioning hole comprises: a first secondary coil positioning hole and a second secondary coil positioning hole, wherein the first secondary coil positioning hole is located at the upper right corner of the base, the first secondary coil positioning hole is 7.5-8.5mm away from the right side edge of the base, and the first secondary coil positioning hole is 2-3mm away from the top side of the base.

[0012] The second secondary coil positioning hole is located at the lower right corner of the base, the second secondary coil positioning hole is 7.5-8.5mm away from the right side edge of the base, and the second secondary coil positioning hole is 2-3mm away from the bottom side of the base.

[0013] In an embodiment, the maximum diameter of the primary coil positioning hole and the secondary coil positioning hole is 2mm.

[0014] In an embodiment, the length of the base is 33.5-34.5mm, and the width of the base is 21.5-22.5mm.

[0015] In an embodiment, the maximum diameter of the ring-shaped magnetic core is 40mm.

[0016] In an embodiment, the maximum winding width of the primary coil and the coil is 23.5mm.

[0017] The above-mentioned amorphous common-mode choke reduces the stray magnetic field of the magnetic core by adopting a ring-shaped magnetic core, so that the magnetic lines are more concentrated and the magnetic density is increased. Since the ring-shaped magnetic core has no air gap, the magnetic permeability of the amorphous common-mode choke is improved, the inter-turn capacitance of the coil is reduced, the frequency band is widened, the primary coil or the secondary coil adopts ferrite nanocrystalline material, has very high magnetic permeability and working frequency, and the magnetic permeability also changes very little with the magnetic flux density and temperature. Only a small number of turns of the coil can obtain a large inductance, reducing the volume and weight of the amorphous common-mode choke, capable of suppressing common-mode interference in a wide frequency range, and enhancing the anti-electromagnetic interference performance of the amorphous common-mode choke. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a front view of an amorphous common-mode inductor according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the base of an amorphous common-mode inductor in one embodiment of the present invention;

[0021] Figure 3 This is a side view of an amorphous common-mode inductor in one embodiment of this utility model.

[0022] Reference numerals: 1. Toroidal core; 3. Primary coil; 5. Secondary coil; 7. Base; 701. Primary coil positioning hole; 7011. First primary coil positioning hole; 7012. Secondary primary coil positioning hole; 703. Secondary coil positioning hole; 7031. First primary coil positioning hole; 7032. Secondary coil positioning hole; 9. Epoxy board. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0024] It should be understood that this invention can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of this invention to those skilled in the art. In the drawings, for clarity, the dimensions of layers and regions, as well as their relative dimensions, may be exaggerated. The same reference numerals denote the same elements throughout.

[0025] It will be understood that when an element or layer is referred to as being "on", "adjacent", "connected to", or "coupled to" another element or layer, it can be directly on, adjacent, connected or coupled to the other element or layer, or intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on", "directly adjacent", "directly connected to", or "directly coupled to" another element or layer, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present application.

[0026] Spatially relative terms, such as "beneath", "below", "lower", "under", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0027] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0028] For a thorough understanding of the present application, reference should be made to the following detailed description, in conjunction with the accompanying drawings, in which:

[0029] In one embodiment, an amorphous common-mode inductor is provided, such as Figure 1 The diagram shows a front view of the amorphous common-mode inductor, which includes: a toroidal core 1, a primary coil 3, and a secondary coil 5. The primary coil 3 is wound on the left side of the toroidal core 1, and the secondary coil 5 is wound on the right side of the toroidal core 1. The toroidal core 1 is made of an iron-based amorphous alloy, and the primary coil 3 or the secondary coil 5 is made of ferrite nanocrystals.

[0030] Iron-based amorphous alloys are amorphous metallic materials with iron (Fe) as the main component. Their atomic arrangement exhibits a metastable structure with short-range order and long-range disorder, unlike the periodic arrangement of traditional crystalline metals. Iron-based amorphous alloys use iron as the core and typically contain non-metallic elements such as silicon (Si) and boron (B). Some alloys may also include carbon (C), phosphorus (P), copper (Cu), and niobium (Nb). They are primarily produced using rapid melt quenching to form amorphous ribbons. These ribbons are then tightly bonded, wound into a closed ring structure, and further processed to form the toroidal magnetic core of the iron-based amorphous alloy.

[0031] Ferrite cores are composite ceramic materials formed by incorporating other metal oxides (such as manganese, zinc, and nickel) based on iron oxide (Fe2O3). They belong to ferrimagnetic materials. In this embodiment, NiCuZn ferrite nanocrystalline material is specifically used as the primary or secondary coil. NiCuZn ferrite nanocrystalline material is a ferrite material with nickel (Ni), copper (Cu), zinc (Zn), and iron (Fe) as its main components. Its microstructure is composed of nanoscale grains, combining the high-frequency characteristics of traditional ferrites with the low-loss advantages of nanocrystalline materials. It is widely used in the field of high-frequency electronic devices.

[0032] In this embodiment, the use of a toroidal magnetic core reduces the stray magnetic field of the core, making the magnetic field lines more concentrated and increasing the magnetic flux density. Since the toroidal magnetic core has no air gap, it improves the magnetic flux density of the amorphous common-mode inductor, reduces the number of turns in the primary and secondary coils, reduces the inter-turn capacitance of the coils, and widens the bandwidth. The primary or secondary coils are made of ferrite nanocrystalline material, which has extremely high permeability and operating frequency. The permeability changes very little with magnetic flux density and temperature, requiring only a small number of coil turns to obtain a large inductance. This reduces the volume and weight of the amorphous common-mode inductor, enabling it to suppress common-mode interference over a wide frequency range and enhancing the electromagnetic interference immunity of the amorphous common-mode inductor.

[0033] In one embodiment, such as Figure 1 As shown, the front view of the amorphous common-mode inductor also includes: a base 7, such as... Figure 2As shown, the base 7 is provided with a primary coil positioning hole 701 and a secondary coil positioning hole 703, the primary coil 3 is led out through the primary coil positioning hole 701, and the secondary coil 5 is led out through the secondary coil positioning hole 703.

[0034] The primary coil positioning hole and the secondary coil positioning hole are arranged to fix the primary coil and the secondary coil on the base, so that the primary coil and the secondary coil are prevented from displacement due to vibration, temperature change or impact of external force.

[0035] In the embodiment, the primary coil of the amorphous common-mode choke is fixed on the base through the primary coil positioning hole, and the secondary coil of the amorphous common-mode choke is fixed on the base through the secondary coil positioning hole, so that the relative position of the primary coil and the secondary coil is controlled, the generation of stray magnetic field is reduced, the electromagnetic compatibility of the amorphous common-mode choke is improved, the primary coil and the secondary coil are accurately attached to the annular magnetic core, the overall performance of the inductor is improved, the inductor is fixed conveniently, and the problem of being easily damaged by collision is avoided.

[0036] In an embodiment, the annular magnetic core bottom is provided with a glue layer, and the glue layer is used to fix the annular magnetic core to the base.

[0037] The glue layer is arranged at the bottom of the annular magnetic core to firmly bond the annular magnetic core to the base.

[0038] In the embodiment, the glue layer is arranged at the bottom of the annular magnetic core to avoid displacement or falling of the magnetic core due to mechanical vibration (such as automobile electronics and industrial equipment operation), and the glue layer can also assist the inductor in heat dissipation, thereby improving the stability of the inductor.

[0039] In an embodiment, as shown in the accompanying drawings, Figure 1 The epoxy plate 9 is arranged at the inner diameter top of the annular magnetic core 1, and the other end of the epoxy plate 9 is fixed to the inner diameter bottom of the annular magnetic core 1, the epoxy plate 9 is used to isolate the current path between the primary coil 3 and the secondary coil 5, and the epoxy plate 9 is also used to provide rigid support for the primary coil 3 and the secondary coil 5 of the common-mode choke.

[0040] The core component of the epoxy plate is epoxy resin, the epoxy group in the molecular structure of the epoxy resin can form a three-dimensional network structure through a curing reaction, and the inorganic substrate is a glass fiber cloth which is impregnated with epoxy resin and formed by hot pressing.

[0041] In the embodiment, the epoxy plate is arranged on the annular magnetic core to isolate the current between the primary winding and the secondary winding of the inductor. The low dielectric constant and arc resistance of the epoxy plate can reduce electromagnetic interference, stabilize the distribution of the magnetic field, avoid signal distortion or transmission abnormalities, and provide stable support to avoid damage caused by collision and improve the stability of the inductor.

[0042] In an embodiment, as shown in Figure 2 the primary coil positioning hole 701 includes a first primary coil positioning hole 7011 and a second primary coil positioning hole 7012, wherein the first primary coil positioning hole 7011 is located at the upper left corner of the base 7, the first primary coil positioning hole 7011 is 7.5-8.5mm away from the left side edge of the base 7, and the first primary coil positioning hole 7012 is 2-3mm away from the top side of the base 7.

[0043] The second primary coil positioning hole 7012 is located at the lower left corner of the base 7, the second primary coil positioning hole 7012 is 7.5-8.5mm away from the left side edge of the base 7, and the second primary coil positioning hole 7012 is 2-3mm away from the bottom side of the base 7.

[0044] The primary coil positioning hole mechanically fixes the primary coil on the base, and then firmly fixes the inductor on the circuit board.

[0045] In the embodiment, the primary coil positioning hole is arranged to connect the inductor and the circuit board, prevent displacement or falling of the inductor caused by external force, maintain stable inductor parameters, and realize rapid positioning and welding of the inductor primary coil through the visual system in automatic production, improve production efficiency, and also serve as part of the heat dissipation path to assist in heat dissipation of the inductor.

[0046] In an embodiment, as shown in Figure 2 the secondary coil positioning hole 703 includes a first secondary coil positioning hole 7031 and a second secondary coil positioning hole 7032, wherein the first secondary coil positioning hole 7031 is located at the upper right corner of the base 7, the first secondary coil positioning hole 7031 is 7.5-8.5mm away from the right side edge of the base 7, and the first secondary coil positioning hole 7031 is 2-3mm away from the top side of the base 7.

[0047] The second secondary coil positioning hole 7032 is located at the lower right corner of the base 7, the second secondary coil positioning hole 7032 is 7.5-8.5mm away from the right side edge of the base 7, and the second secondary coil positioning hole 7032 is 2-3mm away from the bottom side of the base 7.

[0048] The secondary coil positioning hole mechanically fixes the secondary coil on the base, and then firmly fixes the inductor on the circuit board.

[0049] In this embodiment, the inductor is connected to the circuit board through the secondary coil positioning hole, which prevents displacement or falling of the inductor caused by external force, maintains the stability of the inductor parameters, and realizes rapid positioning and welding of the inductor secondary coil through the visual system in the automatic production, thereby improving the production efficiency. It can also be used as part of the heat dissipation path to assist in heat dissipation of the inductor.

[0050] In an embodiment, the maximum diameter of the primary coil positioning hole and the secondary coil positioning hole is 2 mm.

[0051] By limiting the size of the primary coil positioning hole and the secondary coil positioning hole, the magnetic core is prevented from being easily damaged, causing magnetic leakage or signal interference, and at the same time, the amorphous common-mode inductor can be positioned with high precision in a limited space.

[0052] In this embodiment, by setting the maximum diameter of the primary coil positioning hole and the secondary coil positioning hole, the assembly efficiency of the inductor is improved, the electromagnetic compatibility of the inductor is ensured, the inductance and distributed capacitance parameters are stabilized, and the consistency of the inductor product is improved. At the same time, it supports the development of ultra-thin and miniaturization of electronic equipment while maintaining the high power density characteristics of the amorphous common-mode inductor.

[0053] In an embodiment, as shown in Figure 2 The length of the base 7 is in the range of 33.5-34.5 mm, and the width of the base is in the range of 21.5-22.5 mm.

[0054] The base is a rectangular structure with a length in the range of 33.5-34.5 mm and a width in the range of 21.5-22.5 mm. When setting the size of the base, the space position reserved on the circuit board needs to be strictly matched to ensure that the inductor can be successfully installed on the circuit board.

[0055] In this embodiment, by setting the size of the base of the amorphous common-mode inductor, the inductor can be correctly installed on the PCB circuit board, improving compatibility, facilitating automated mounting and mass production, and reducing the complexity of production and manufacturing.

[0056] In an embodiment, the maximum diameter of the ring-shaped magnetic core is 40 mm.

[0057] In this embodiment, the maximum diameter of the ring-shaped magnetic core is set to balance the inductance and saturation current of the inductor, reduce the influence of parasitic capacitance and distributed inductance, and prolong the working frequency of the inductor. It can also avoid occupying too much space for the amorphous common-mode inductor, prevent electromagnetic coupling, and enhance the anti-electromagnetic interference performance of the amorphous common-mode inductor.

[0058] In an embodiment, as shown in Figure 3 The maximum winding width of the primary coil and the coil is 23.5mm.

[0059] In the embodiment, the maximum winding turns of the primary coil and the secondary coil are set, the concentration of the magnetic field in the annular magnetic core is enhanced, the magnetic leakage rate is reduced, the efficiency of the inductor is improved, the eddy current loss and the parasitic capacitance are reduced, the working frequency range of the inductor is prolonged, the inductive coupling loss between the coils is reduced, the quality factor of the inductor is improved, and the transmission efficiency of the high-frequency signal is enhanced.

[0060] The amorphous common-mode inductor in the above embodiment has the following parameters: the inductance is 7500uHMAX at 1KHz and 0.25V, and the inductance is 1100uHMIN at 140KHz and 0.05V, which can effectively suppress common-mode noise and is suitable for power filtering and electromagnetic interference suppression fields.

[0061] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalent ones; and these modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. An amorphous common mode inductor, characterized by, Comprise: annular magnetic core, primary coil and secondary coil, the primary coil is wound on the left side of the annular magnetic core, the secondary coil is wound on the right side of the annular magnetic core, wherein the material of the annular magnetic core is iron-based amorphous alloy, and the material of the primary coil or the secondary coil is ferrite nanocrystalline.

2. The common mode inductance of claim 1, wherein, Also include: the base is provided with primary coil positioning hole and secondary coil positioning hole, the primary coil is led out through the primary coil positioning hole, and the secondary coil is led out through the secondary coil positioning hole.

3. The common mode inductance of claim 2, wherein, The bottom of the annular magnetic core is provided with a glue layer for fixing the annular magnetic core to the base.

4. The common mode inductance of claim 3, wherein, Also include: Epoxy plate, one end of the epoxy plate is fixed at the top of the inner diameter of the annular magnetic core, the other end of the epoxy plate is fixed at the bottom of the inner diameter of the annular magnetic core, the epoxy plate is used to isolate the current path between the primary coil and the secondary coil, and the epoxy plate is also used to provide rigid support for the primary coil and the secondary coil of the common mode inductor.

5. The common mode inductance of claim 4, wherein, The primary coil positioning hole comprises: first primary coil positioning hole and second primary coil positioning hole, wherein the first primary coil positioning hole is located at the upper left corner of the base, the distance between the first primary coil positioning hole and the left side edge of the base is 7.5-8.5mm, and the distance between the first primary coil positioning hole and the top side of the base is 2-3mm; The second primary coil positioning hole is located at the lower left corner of the base, the distance between the second primary coil positioning hole and the left side edge of the base is 7.5-8.5mm, and the distance between the second primary coil positioning hole and the bottom side of the base is 2-3mm.

6. The common mode inductance of claim 5, wherein, The secondary coil positioning hole comprises: first secondary coil positioning hole and second secondary coil positioning hole, wherein the first secondary coil positioning hole is located at the upper right corner of the base, the distance between the first secondary coil positioning hole and the right side edge of the base is 7.5-8.5mm, and the distance between the first secondary coil positioning hole and the top side of the base is 2-3mm; The second secondary coil positioning hole is located at the lower right corner of the base, the distance between the second secondary coil positioning hole and the right side edge of the base is 7.5-8.5mm, and the distance between the second secondary coil positioning hole and the bottom side of the base is 2-3mm.

7. The common mode inductance of claim 6, wherein, The maximum diameter of the primary coil positioning hole and the secondary coil positioning hole is 2mm.

8. The common mode inductance of claim 7, wherein, The length of the base ranges from 33.5mm to 34.5mm, and the width of the base ranges from 21.5mm to 22.5mm.

9. The common mode inductance of claim 8, wherein, The maximum diameter of the annular magnetic core is 40mm.

10. The common mode inductance of claim 9, wherein, The maximum winding width of the primary coil and the coil is 23.5mm.

Images