Full-shielding large-current inductor

Abstract

The invention provides a full-shielding large-current inductor, which comprises a shell, a middle column, at least two coils and an isolation component, and is characterized in that the at least two coils are sequentially wound on the middle column from top to bottom and are used for generating an inductive effect through accessed current; the wiring end of the coil penetrates through the isolation assembly to form a pin, and the pin is used for being connected with a circuit board; the shell is provided with a containing cavity and an opening, and the containing cavity is used for containing the middle column and the coil; the opening is used for communicating the accommodating cavity with an external space; the isolation assembly is arranged at the opening and used for blocking the opening and shielding electromagnetism generated after current is connected to the coil. By means of the full-shielding large-current inductor in the embodiment, the inductor which gives consideration to the large-current scheme design and meets the certification standard of CISPR 25 or Class 5 at the same time can be achieved.

Description

Technical Field

[0001] This invention relates to the field of inductors, and more particularly to a fully shielded high-current inductor. Background Technology

[0002] Inductors are commonly used electronic components in electronic products. They impede alternating current through their internal windings, thus filtering and stabilizing the voltage of the entire circuit. Electromagnetic compatibility (EMC) standards are a series of specifications to ensure that electronic equipment can operate normally in electromagnetic environments without causing interference. CISPR 25, developed by the International Electrotechnical Commission (IEC), is the automotive electromagnetic interference (EMI) standard widely used for EMC testing of automotive electronic equipment. Class 5 is the highest level of certification in this standard, with the most stringent limits on electromagnetic interference. Existing high-current inductor technology struggles to simultaneously accommodate high-current design requirements and meet both CISPR 25 and Class 5 certification standards. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a fully shielded high-current inductor, aiming to achieve the goal of simultaneously considering high-current scheme design and meeting CISPR 25 or Class 5 certification standards.

[0004] To this end, one embodiment provides a fully shielded high-current inductor, which includes a housing, a center column, a coil, and an isolation assembly;

[0005] At least two coils are provided and wound sequentially from top to bottom on the central column to generate an inductive effect through the applied current;

[0006] The terminals of the coil pass through the isolation assembly to form pins, which are used to connect to the circuit board.

[0007] The housing is provided with a receiving cavity and an opening. The receiving cavity is used to accommodate the central column and the coil. The opening is used to connect the receiving cavity and the external space.

[0008] The isolation component is disposed at the opening to block the opening and shield the electromagnetic field generated after the coil is connected to current.

[0009] As a further alternative to the fully shielded high-current inductor, the isolation assembly includes a partition and a base, the partition and the base being stacked together, and the partition being disposed away from the housing.

[0010] As a further alternative to the fully shielded high-current inductor, the partition is made of FR4 material.

[0011] As a further alternative to the fully shielded high-current inductor, the base and the housing are made of the same material.

[0012] As a further alternative to the fully shielded high-current inductor, the material used to manufacture the housing and the base is one of Mn-Zn ferrite, Ni-Zn ferrite, or amorphous nanomaterials.

[0013] As a further alternative to the fully shielded high-current inductor, the housing and the base are made of ferrite with a permeability ranging from 2000 to 3000 H / m.

[0014] As a further alternative to the fully shielded high-current inductor, the permeability of the central column is in the range of 26-60 H / m, and the saturation magnetic flux density is not less than 1.2 T.

[0015] As a further alternative to the fully shielded high-current inductor, the material of the central column is one of iron-nickel alloy, iron-silicon-aluminum, iron-silicon, iron-silicon-nickel, or amorphous nanocrystals.

[0016] As a further alternative to the fully shielded high-current inductor, a gasket is also included, which is located at the upper and lower ends of the central column and abuts against the inner wall of the housing.

[0017] As a further alternative to the fully shielded high-current inductor, the number of coils is two.

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

[0019] Based on the fully shielded high-current inductor in the above embodiments, at least two coils are wound around the center post, and the inductance effect is generated when current flows through the coils. Since the current in the coils varies, the magnetic field around the coils also changes. The housing and isolation assembly enclose a sealed space, thereby eliminating electromagnetic radiation problems caused by exposed coils. Leads pass through the isolation assembly to achieve connection and mounting to the circuit board. The fully shielded high-current inductor in this embodiment achieves an inductor that simultaneously accommodates high-current design and meets CISPR 25 or Class 5 certification standards. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In addition, to show the difference in curves between the fully shielded high-current inductor of the present invention and existing high-current inductors of the same size, the drawings of the present invention are in color.

[0021] in:

[0022] Figure 1 This diagram illustrates the overall structure of a fully shielded high-current inductor according to an embodiment of the present invention.

[0023] Figure 2 An exploded structural diagram of a fully shielded high-current inductor provided according to an embodiment of the present invention is shown;

[0024] Figure 3 A schematic diagram showing the comparison results of prior art inductors of the same size provided according to embodiments of the present invention under conditions (25KHz / 10mT) between 20℃ and 120℃ is presented.

[0025] Figure 4 A schematic diagram showing the comparison results of prior art inductors of the same size provided according to embodiments of the present invention under conditions (100KHz / 10mT) between 20℃ and 120℃ is shown.

[0026] Figure 5 A schematic diagram showing the comparison results of prior art inductors of the same size provided according to embodiments of the present invention under conditions (300KHz / 10mT) and 20℃-120℃ is presented.

[0027] Figure 6 A schematic diagram showing the comparison results of prior art inductors of the same size provided according to embodiments of the present invention under conditions (500KHz / 10mT) and 20℃-120℃ is presented.

[0028] Figure 7 This diagram illustrates the results of comparing the saturation current of prior art inductors of the same size in the range of 0-350A, as provided by an embodiment of the present invention.

[0029] Figure 8 A schematic diagram showing the Q-value variation of a large inductor of the same size in the prior art within the range of 1-10000KHz is provided according to an embodiment of the present invention.

[0030] Explanation of key component symbols:

[0031] Housing-10; Center column-20; Coil-30; Isolation assembly-40; Opening-120; Pin-310; Base-420; Separator-430; Gasket-50. Detailed Implementation

[0032] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0033] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] This invention provides a fully shielded high-current inductor; please refer to [reference needed]. Figure 1 and Figure 2 The directional heat shrinking device includes a housing 10, a central column 20, a coil 30, and an isolation component 40. At least two coils 30 are arranged and wound sequentially from top to bottom on the central column 20 to generate an inductive effect through the applied current. The terminals of the coils 30 pass through the isolation component 40 to form pins 310, which are used to connect to a circuit board. The housing 10 is provided with a receiving cavity (not shown) and an opening 120. The receiving cavity is used to receive the central column 20 and the coils 30. The opening 120 is used to connect the receiving cavity to the external space. The isolation component 40 is disposed at the opening 120 to block the opening 120 and shield the electromagnetic field generated after the coils 30 are connected to the current.

[0036] Based on the fully shielded high-current inductor in the above embodiments, at least two coils 30 are wound around the central post 20, and the inductance effect is generated when current flows through the coils 30. Since the current in the coils 30 varies, the magnetic field around the coils 30 also changes. The housing 10 and the isolation component 40 enclose a sealed space, thereby eliminating electromagnetic radiation problems caused by exposed coils 30. The pins 310 pass through the isolation component 40 to achieve connection and installation with the circuit board. Implementing the fully shielded high-current inductor in this embodiment enables an inductor that simultaneously accommodates high-current design and meets CISPR 25 or Class 5 certification standards.

[0037] In some specific embodiments, the isolation component 40 includes a partition 430 and a base 420, the partition 430 and the base 420 are stacked, and the partition 430 is disposed away from the housing 10.

[0038] Primarily used to enhance the strength of the base 420, while also increasing the solder creep space and improving solder joint reliability. Because the base 420 is made of magnetic core material and is quite thin, its strength is not high, thus requiring the partition plate 430 for support. The base 420 mainly works with the housing 10 to form a closed magnetic circuit.

[0039] In some specific embodiments, the partition 430 is made of FR4 material.

[0040] FR-4 (Flame Retardant 4) is a commonly used insulating material widely used in electronic equipment, especially in the manufacture of printed circuit boards (PCBs). FR-4 is a glass fiber reinforced epoxy resin material. Its main components include glass fiber, epoxy resin, and flame retardant. Glass fiber reinforcement gives it high mechanical strength and maintains good dimensional stability even at high temperatures. FR-4 has low water absorption, making it suitable for use in humid environments. Its dielectric constant is approximately 4.4 (at 1MHz), making it suitable for high-frequency applications. It has low electrical loss, making it suitable for high-speed signal transmission. Its operating temperature is typically between 130°C and 150°C; above this temperature, the material softens.

[0041] In some specific embodiments, the base 420 and the housing 10 are made of the same material.

[0042] The base 420 and the housing 10 must be made of the same material to maintain the consistency of the closed magnetic circuit and avoid magnetic circuit deviation or leakage.

[0043] Please refer to Figure 3 This is a comparison between industry-standard high-current inductors of similar size and the fully shielded high-current inductor of this invention. From... Figure 3As can be seen, under the same operating temperature and current conditions, the electromagnetic radiation of the fully shielded high-current inductor in this invention is far less than that of high-current inductors of the same size in the industry.

[0044] In a test environment with a magnetic field frequency of 25 kHz, the total loss of the fully shielded high-current inductor in this embodiment is reduced by about 40% compared with similar high-current inductors of the same size in the industry under an ambient temperature of 25°C.

[0045] The total loss of the fully shielded high-current inductor in this embodiment is reduced by about 40% compared with similar high-current inductors of the same size in the industry under an ambient temperature of 100°C.

[0046] The industry-standard high-current inductors of the same size refer to high-current inductors with the same length, width, and height. Generally speaking, the larger the inductor's size, the stronger its parameter capabilities. In the automotive electronics industry, large-sized high-current inductors are used.

[0047] Please refer to Figure 4 In a test environment with a magnetic field frequency of 100 kHz, the total loss of the fully shielded high-current inductor in this embodiment is reduced by about 16% compared with similar high-current inductors of the same size in the industry under an ambient temperature of 25°C.

[0048] The total loss of the fully shielded high-current inductor in this embodiment is reduced by about 26% compared with similar high-current inductors of the same size in the industry under an ambient temperature of 100°C.

[0049] Please refer to Figure 5 In a test environment with a magnetic field frequency of 300 kHz, the total loss of the fully shielded high-current inductor in this embodiment is reduced by about 30% compared with similar high-current inductors of the same size in the industry at an ambient temperature of 25°C.

[0050] In this embodiment, the total loss of the fully shielded high-current inductor is reduced by about 40% compared to similar high-current inductors of the same size in the industry, under an ambient temperature of 25°C.

[0051] Please refer to Figure 6 Under a test environment with a magnetic field frequency of 500 kHz, the total loss of the fully shielded high-current inductor in this embodiment is comparable to that of similar-sized high-current inductors in the industry at ambient temperatures of 25°C and 100°C. Even above 100°C, the power loss performance of the fully shielded high-current inductor in this invention remains stable. Therefore, the fully shielded high-current inductor offers advantages such as energy saving, reduced power consumption, and low heat generation.

[0052] Please refer to Figure 7In this embodiment, the test environment is a magnetic field strength of 10 millitalas, a magnetic field frequency of 25 kilohertz (i.e., an alternation frequency of 25,000 times per second), and a test temperature of 20°C-120°C. "Core Loss [kW / m 3 Core loss is a term used to describe the power loss of magnetic materials (such as transformer cores and inductor cores) in an alternating magnetic field. Specifically, core loss refers to the energy loss caused by effects such as hysteresis, eddy currents, and magnetostriction in magnetic materials within an alternating magnetic field. A lower CoreLoss value indicates less energy loss and stronger shielding capability of the inductor.

[0053] In summary, the fully enclosed magnetic circuit structure differs from the traditional semi-shielded design. By sealing the outer shell and the base together, a complete magnetic shielding cavity is formed, which structurally eliminates the electromagnetic radiation problem caused by exposed coils. It meets stringent EMC standards such as CISPR 25 Class 5 and improves the testing accuracy of testing equipment (error ≤1%).

[0054] In some specific embodiments, the material used to make the housing 10 and the base 420 is one of Mn-Zn ferrite, Ni-Zn ferrite, or amorphous nanomaterial.

[0055] Specifically, the housing 10 can be made of manganese-zinc (Mn-Zn) ferrite, which has high permeability, high saturation magnetic induction, and good high-frequency characteristics, effectively improving the performance of the inductor; or nickel-zinc (Ni-Zn) ferrite, which has low loss and high resistivity in the high-frequency range, making it suitable for high-frequency applications; or an amorphous nanocrystalline alloy, which possesses excellent soft magnetic properties, high saturation magnetic induction, and good mechanical properties, and exhibits low loss over a wide frequency range, further optimizing the inductor's performance. By selecting any of the above materials to manufacture the inductor housing 10 and base 420, the overall performance of the inductor can be significantly improved, enabling it to perform better in various electronic devices.

[0056] In some specific embodiments, the housing 10 and the base 420 are made of ferrite with a magnetic permeability ranging from 2000 to 3000 H / m.

[0057] Specifically, the permeability of the ferrite ranges from 2000 to 3000 Henry per meter (H / m). This permeability range significantly improves the performance of the housing 10 and base 420 in electromagnetic shielding, magnetic coupling, and high-frequency applications. By selecting a ferrite material with the aforementioned permeability range, this invention effectively reduces electromagnetic interference, improves the efficiency of electromagnetic components, and ensures their stability in complex electromagnetic environments. The ferrite material can be manganese-zinc (Mn-Zn) ferrite, nickel-zinc (Ni-Zn) ferrite, or composites thereof. These materials exhibit excellent soft magnetic properties within the permeability range, including high permeability, low coercivity, and good temperature stability. Furthermore, the microstructure and properties of the ferrite material can be further optimized through specific fabrication processes to meet the specific needs of different application scenarios.

[0058] Under these conditions, the inductor can operate at temperatures between -40°C and 125°C, which meets the usage scenarios of most automobiles.

[0059] In some specific embodiments, the magnetic permeability of the central column 20 is in the range of 26-60 H / m, and the saturation magnetic flux density is not less than 1.5 T.

[0060] In a specific embodiment of the present invention, the magnetic properties of the central column 20 are carefully designed to meet specific electromagnetic application requirements. Specifically, the permeability of the central column 20 is precisely controlled between 26 and 60 Henry per meter (H / m). This permeability range is selected to ensure that the central column 20 exhibits excellent magnetic permeability performance during electromagnetic conversion, while also considering material processability and cost-effectiveness. Furthermore, the saturation magnetic flux density of the central column 20 is set to be no less than 1.2 Tesla (T). This high saturation magnetic flux density value enables the central column 20 to maintain stable magnetic properties in high-intensity magnetic field environments, thereby effectively improving the overall efficiency and reliability of the electromagnetic component. By controlling the permeability and saturation magnetic flux density within the aforementioned ranges, the central column 20 of the present invention not only achieves efficient magnetic energy transmission but also exhibits superior performance in high-frequency and high-power applications, providing a solid material foundation for the high-performance operation of electromagnetic devices.

[0061] It should be noted that the central column 20 serves as the main magnetic circuit, carrying a large DC bias current. The base 420 is sealed to the bottom of the outer casing, using the same material as the outer casing. A ferrite core is used to seal the core opening 120, forming a fully shielded magnetic circuit.

[0062] Please refer to Figure 7In this embodiment, the fully shielded high-current inductor exhibits the same saturation current linearity as a high-current inductor of the same size, but with a higher inductance value at the beginning of the curve. This is because the outer shell and base 420 are made of high-permeability ferrite material, and the core material has a relatively small BS value. Therefore, under the influence of magnetic field strength, the core material of the shielding shell and base 420 gradually approaches saturation first. However, since the central column 20 uses other magnetic powder core materials, the current curve tends to stabilize when the current reaches a certain value, allowing it to continuously store more energy. The high-permeability outer shell and base 420 effectively shield against magnetic field interference (magnetic fields are easily attracted by high-permeability materials), combined with the stable current curve during continuous operation of the high-current stage, achieves both resistance to electromagnetic interference and the ability to withstand high-current unsaturation.

[0063] Please refer to Figure 8 The fully shielded high-current inductor has a steeper Q-value curve peak than a high-current inductor of the same size, enabling it to store more energy (Q-value peak is improved by 35%), and the overall inductor loss is significantly reduced.

[0064] The quality factor (Q) of an inductor is a crucial parameter used to measure its performance. It reflects the ratio of energy stored to energy dissipated at a specific frequency. A high Q value indicates that the inductor has lower losses and higher efficiency in storing and transferring energy. In filter applications, high-Q inductors provide steeper filtering characteristics and better selectivity for specific frequencies. High-Q inductors also exhibit better stability and reduced signal distortion in high-frequency applications.

[0065] In summary, by selecting materials for the magnetic core (housing 10 and base 420) and the magnetic column, the fully shielded high-current inductor of this invention can store more energy and has lower losses compared to existing high-current inductors of the same size.

[0066] This invention employs a composite magnetic core collaborative design: the housing 10 and the base 420 utilize high permeability to achieve efficient magnetic shielding, while the magnetic powder core column 20 enhances anti-saturation capability with its high Bs value. The combination of the two breaks through the performance bottleneck of a single material, enabling the inductor to have both low loss and stable inductance value under high current.

[0067] In some specific embodiments, the material of the central column 20 is one of iron-nickel alloy, iron-silicon-aluminum, iron-silicon, iron-silicon-nickel, and amorphous nanocrystals.

[0068] Iron-nickel alloys are renowned for their high permeability, low coercivity, and good temperature stability. Their excellent soft magnetic properties make them outstanding in high-frequency and high-precision electromagnetic applications, effectively reducing hysteresis losses and improving the efficiency of electromagnetic components.

[0069] Iron-silicon-aluminum alloys improve the magnetic properties and processing performance of materials by adding aluminum. They have high saturation magnetic flux density and good soft magnetic properties, making them suitable for applications requiring high magnetic induction intensity and low loss.

[0070] Ferrosilicon alloy is a commonly used soft magnetic material with high saturation magnetic flux density and good mechanical properties. Its application in the central column 20 ensures the stability of the electromagnetic component during high-power and high-efficiency operation.

[0071] Iron-silicon-nickel alloys combine the advantages of nickel and silicon, possessing excellent soft magnetic properties and high resistivity, which can effectively reduce eddy current losses, making them particularly suitable for high-frequency electromagnetic applications.

[0072] Amorphous and nanocrystalline alloys possess unique microstructures, exhibiting extremely high permeability, low coercivity, and excellent soft magnetic properties. They perform exceptionally well in high-frequency and high-power applications, significantly reducing losses and improving the efficiency of electromagnetic components.

[0073] By selecting any of the aforementioned materials, the central column 20 can achieve efficient and stable performance in various electromagnetic applications. These materials share common characteristics including high permeability, high saturation flux density, and low loss, making them ideal for manufacturing high-performance electromagnetic components. Furthermore, the diversity and processability of these materials provide flexibility in the design of the central column 20 of this invention to meet the specific needs of different application scenarios.

[0074] In some specific embodiments, a gasket 50 is also included, which is located at the upper and lower ends of the central column 20 and abuts against the inner wall of the housing 10.

[0075] The gasket 50 is used to balance the inductance and saturation current. It is a non-magnetic air gap that increases magnetic reluctance and reduces effective permeability.

[0076] Non-magnetic air gaps are an indispensable part of magnetic circuits, and their characteristics have a significant impact on the performance of electromagnetic equipment. By rationally designing the size and material of the air gap, the efficiency, power factor, and mechanical properties of the equipment can be optimized.

[0077] In some specific embodiments, the housing 10 is assembled from an E-type half-shell and a P-type half-shell.

[0078] In a specific embodiment of the present invention, the inductor housing 10 adopts a unique split design to achieve efficient assembly and excellent electromagnetic shielding performance. Specifically, the housing 10 consists of two half-shells, namely an E-type half-shell and a P-type half-shell. These two half-shells can be tightly assembled together through precise geometric design and fit to form a complete housing 10 structure.

[0079] The E-type half-shell is shaped like the letter "E" and has three parallel columnar sections. The middle columnar section is called the central column 20, and the two side columnar sections are called the side columns. This design allows the E-type half-shell to provide a stable magnetic circuit path and form a channel for magnetic flux between the central column 20 and the side columns.

[0080] The P-type half-shell is shaped like the letter "P," featuring a large planar portion and a protruding columnar portion. The P-type half-shell is designed to fit snugly with the central post 20 and side posts of the E-type half-shell to form a complete magnetic circuit.

[0081] In some specific embodiments, the number of coils 30 is two.

[0082] The dual-coil 30 design increases the inductor's overcurrent capability while avoiding the difficulty of winding excessively thick coil wire. The coil 30 can be circular, elliptical, or square. Furthermore, the dual-winding structure achieves extremely low DCR, distributes current ripple, results in lower copper wire losses, high efficiency, and low heat generation.

[0083] In inductor specifications, DCR (Direct Current Resistance) is a very important parameter. It refers to the resistance value of the inductor under direct current conditions.

[0084] DCR directly affects the efficiency of an inductor. A higher DCR results in more energy being lost as heat, thus reducing the inductor's efficiency. In power supply circuits, inductors with low DCR can reduce power consumption and improve overall efficiency.

[0085] A higher DCR results in more heat being generated by the current flowing through the inductor. This can cause the inductor's temperature to rise, affecting its performance and lifespan. Therefore, inductors with low DCR are more suitable for high-current applications.

[0086] The multi-coil 30 parallel structure enables current and ripple shunting, reducing copper wire loss and dependence on winding equipment.

[0087] For example, gallium nitride (GaN) adapter technology: the multi-coil parallel winding scheme reduces the current density of a single conductor, reduces skin effect losses (copper losses are reduced by 30%), while supporting high-density installation, reducing the size by 40% compared to traditional solutions, and achieving a power density of 500W / in. 3 The above is adapted to the needs of high-frequency and miniaturized power supply systems.

[0088] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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, they should be considered to be within the scope of this specification.

[0089] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A fully shielded high-current inductor, characterized in that, Includes housing, center column, coil, and isolation components; At least two coils are provided and wound sequentially from top to bottom on the central column to generate an inductive effect through the applied current; The coil's terminals pass through the isolation assembly to form pins, which are used to connect to the circuit board; the housing has a receiving cavity and an opening, the receiving cavity being used to accommodate the central column and the coil; the opening is used to connect the receiving cavity to the external space. The isolation component is disposed at the opening to block the opening and shield the electromagnetic field generated after the coil is connected to current.

2. The fully shielded high-current inductor as described in claim 1, characterized in that, The isolation assembly includes a partition and a base, the partition and the base being stacked on top of each other, and the partition being disposed away from the housing.

3. The fully shielded high-current inductor as described in claim 2, characterized in that, The partition is made of FR4 material.

4. The fully shielded high-current inductor as described in claim 2, characterized in that, The base and the housing are made of the same material.

5. A fully shielded high-current inductor as described in claim 4, characterized in that, The material used to make the shell and the base is one of Mn-Zn ferrite, Ni-Zn ferrite, or amorphous nanomaterial.

6. The fully shielded high-current inductor as described in claim 5, characterized in that, The housing and the base are made of ferrite, and the magnetic permeability of the ferrite is in the range of 2000-3000 H / m.

7. A fully shielded high-current inductor as described in claim 6, characterized in that, The magnetic permeability of the central column is in the range of 26-60 H / m, and the saturation magnetic flux density is not less than 1.2 T.

8. A fully shielded high-current inductor as described in claim 7, characterized in that, The material of the central column is one of the following: iron-nickel alloy, iron-silicon-aluminum, iron-silicon, iron-silicon-nickel, or amorphous nanocrystals.

9. A fully shielded high-current inductor as described in claim 1, characterized in that, It also includes gaskets located at the upper and lower ends of the central column and abutting against the inner wall of the housing.

10. A fully shielded high-current inductor as described in claim 1, characterized in that, The shell is assembled from E-type half-shells and P-type half-shells.

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