Three-phase broadband common-mode inductor structure with composite core

Abstract

The utility model discloses a kind of composite magnetic core three-phase broadband common mode inductance structure, including upper layer / lower layer "three clover type" magnetic core and by three same material cylindrical magnetic column three equal parts to be arranged in "three clover type" magnetic core edge and form a whole, provide mechanical support and magnetic circuit extension (below by upper layer magnetic core and lower layer magnetic core are expressed). Coil is wound on the three cylindrical magnetic columns of being set opposite respectively, winding direction of coil is same, central shaft magnetic column directly contacts upper and lower layer "three clover type" magnetic core center, and upper and lower layer magnetic core material is different, overall structure is centrally fixed on the upper end of bottom plate;The structure of the present application is simple and quick to assemble, three-phase balance is good, overall integration is high, effectively suppresses the magnetic permeability attenuation and loss surge of inductance at high frequency, significantly improves the common mode rejection capability of inductance in full frequency band.

Description

Technical Field

[0001] This invention relates to the field of magnetic components technology, and in particular to a composite magnetic core three-phase broadband common-mode inductor structure. Background Technology

[0002] A common-mode inductor is an inductive component that is a core filtering device in electromagnetic compatibility (EMC) design. Common-mode inductors are primarily used to suppress common-mode noise in circuits. When a noise current passes through the inductor core, it generates a magnetic flux in the same direction. The core exhibits high permeability and high inductive reactance, impeding noise conduction.

[0003] Currently, most commercially available inductors use a single material, making it difficult to cover high performance across the entire frequency range. Furthermore, commonly used manganese-zinc ferrite single-core inductors exhibit rapid impedance decay and a dramatic increase in eddy current losses at high frequencies (above several MHz). Discrete core inductors, on the other hand, result in large structures, poor three-phase balance, and are inconvenient for installation and transportation. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a composite magnetic core three-phase wideband common-mode inductor structure. The invention adopts a "cloverleaf" structure that is naturally suitable for three-phase systems, with good magnetic circuit symmetry and high integration. It can solve the problem that a single material cannot cover the high-performance requirements of the entire frequency band, effectively suppress the inductor's permeability decay and loss surge at high frequencies, and improve the common-mode rejection capability.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a three-phase wideband common-mode inductor structure with a composite magnetic core, characterized in that it includes an upper magnetic core, a lower magnetic core, a central axis magnetic column, a first coil, a second coil, a third coil, and a fixed base plate.

[0006] Preferably, the upper magnetic core and the lower magnetic core are ferrite magnetic cores, and the central axis magnetic column is an amorphous nanocrystalline alloy magnetic core.

[0007] Preferably, in the low-frequency range, the magnetic reluctance of the amorphous nanocrystalline alloy core is 1-2 times that of the ferrite core; in the high-frequency range, the magnetic reluctance of the ferrite core is 5-30 times that of the amorphous nanocrystalline alloy core; and in the low-frequency range, the ferrite core has extremely high initial permeability, while in the high-frequency range, the amorphous nanocrystalline alloy core has excellent permeability retention capability and extremely low core loss.

[0008] Preferably, the first coil, the second coil, and the third coil are all wound with flat enameled copper wire, and the fixed base plate is an insulating structural component with several slots. The enameled wire insertion pins of the first coil, the second coil, and the third coil pass through and extend out of the slots.

[0009] Preferably, when the first coil, the second coil, and the third coil are energized, the first coil, the second coil, and the third coil are in phase and have the same current.

[0010] Preferably, the inner cavities of the upper magnetic core and the lower magnetic core are provided with limiting grooves. The shape of the limiting grooves is adapted to the shape of the side end of the central axis magnetic column. The limiting grooves are used to fix and limit the central axis magnetic column, the upper magnetic core (1) and the lower magnetic core.

[0011] The beneficial effects of this invention are as follows: Firstly, the first, second, and third coils are wound around three opposing coil posts, effectively improving the overall integration of the inductor structure and facilitating heat dissipation. Secondly, the central axis magnetic post structure design offers better anti-interference performance than cylindrical magnetic posts. Thirdly, the amorphous nanocrystalline alloy magnetic post is designed at the very center of two clover-shaped ferrite cores. The clover-shaped magnetic circuit exhibits good symmetry. When the amorphous nanocrystalline alloy magnetic post and ferrite cores are energized, the ferrite possesses extremely high initial permeability and low reluctance at low and medium frequencies, providing extremely high common-mode impedance. At high frequencies, the amorphous nanocrystalline alloy exhibits excellent permeability retention and extremely low core loss, effectively compensating for the ferrite's sharp decrease in permeability and surge in loss at high frequencies, significantly improving the inductor's common-mode rejection capability across the entire frequency range. Attached Figure Description

[0012] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0013] Figure 1 This is a schematic diagram of the novel interleaved parallel inductor structure in this utility model;

[0014] Figure 2 This is an exploded view of the structure of the novel interleaved parallel inductor structure in this utility model;

[0015] Reference numerals: Upper magnetic core (1); Lower magnetic core (2); Intermediate shaft magnetic column (3); First coil (4); Second coil (5); Third coil (6); Fixed base plate (7); Slot (8); Limiting slot (9). Detailed Implementation

[0016] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0017] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or may have an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or may have an intervening component. When a component is said to be "set on" another component, it can be directly set on the other component or may have an intervening component. The terms "combined," "tripartite," "left," "right," and similar expressions used in this article are for illustrative purposes only.

[0018] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains. Example

[0019] like Figure 1 As shown, this embodiment provides a three-phase wideband common-mode inductor structure with a composite magnetic core, characterized in that it includes an upper magnetic core (1), a lower magnetic core (2), a central axis magnetic column (3), a first coil (4), a second coil (5), a third coil (6), and a fixed base plate (7).

[0020] The lower magnetic core (2) is fixedly installed at the upper center of the fixed base plate (7). The upper magnetic core (1) consists of three first columns arranged in three equal parts to form a whole. The lower magnetic core (2) consists of three second columns arranged in three equal parts to form a whole. The first columns and second columns are spliced ​​together to form a coil column. The first coil (4), the second coil (5) and the third coil (6) are respectively wound on the three coil columns arranged in opposite parts. The central axis magnetic column (3) is fixed in the center on the lower magnetic core (2).

[0021] The three-phase wideband common-mode inductor structure with composite magnetic core described in this embodiment is characterized in that the upper magnetic core (1) and the lower magnetic core (2) are ferrite magnetic cores, and the central axis magnetic column (3) is an amorphous nanocrystalline alloy magnetic core.

[0022] In this embodiment, in the low-frequency range, the magnetic reluctance of the amorphous nanocrystalline alloy core is 1-2 times that of the ferrite core; in the high-frequency range, the magnetic reluctance of the ferrite core is 5-30 times that of the amorphous nanocrystalline alloy core. Furthermore, in the low-frequency range, the ferrite core has extremely high initial permeability, while in the high-frequency range, the amorphous nanocrystalline alloy core has excellent permeability retention capability and extremely low core loss.

[0023] Specifically, in this embodiment, the ferrite core undertakes the low magnetic reluctance path in the mid-to-low frequency band and provides the basic common-mode impedance; the amorphous nanocrystalline alloy magnetic column in the high-frequency band has lower loss and magnetic reluctance, and preferentially passes through the common-mode magnetic flux to achieve efficient suppression of high-frequency noise; this technical solution reuses the ferrite core and the amorphous nanocrystalline alloy magnetic core, so that the upper magnetic core (1), the lower magnetic core (2), and the central axis magnetic column (3) form an integrated magnetic core, giving full play to the advantages of the ferrite core and the amorphous nanocrystalline alloy magnetic core, and improving the common-mode suppression capability of the inductor in the entire frequency band.

[0024] In this embodiment, the first coil (4), the second coil (5) and the third coil (6) are all wound with flat enameled copper wire. The fixed base plate (7) is an insulating structure with several slots (8) provided. The enameled wire insertion pins of the first coil (4), the second coil (5) and the third coil (6) pass through and extend out of the slots (8).

[0025] Specifically, in this embodiment, the pins of the first coil (4), the second coil (5), and the third coil (6) cooperate with each other in the slots (8) on the fixed base plate (7) to facilitate the installation and removal of the pins of the first coil (4), the second coil (5), and the third coil (6) from the slots (8) on the fixed base plate (7).

[0026] In this embodiment, when the first coil (4), the second coil (5) and the third coil (6) are energized, the first coil (4), the second coil (5) and the third coil (6) are in the same phase and have the same current.

[0027] Specifically, in this embodiment, when the common-mode current passes through the first coil (4), the second coil (5) and the third coil (6), according to the right-hand screw rule, the magnetic flux generated by the coil windings is in the same direction. At this time, the inductor exhibits high inductive reactance and forms a series high-resistance blocking effect on the common-mode noise.

[0028] In this embodiment, the inner cavities of the upper magnetic core (1) and the lower magnetic core (2) are provided with limiting grooves (9). The shape of the limiting grooves (9) is adapted to the shape of the side end of the central axis magnetic column (3). The limiting grooves (9) are used to fix and limit the central axis magnetic column (3), the upper magnetic core (1) and the lower magnetic core (2).

[0029] Specifically, in this embodiment, by setting a limiting groove (9), the central axis magnetic column (3), the upper magnetic core (1) and the lower magnetic core (2) are fixed and limited, which also facilitates installation and disassembly.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A three-phase broadband common-mode inductor structure with a composite magnetic core, characterized in that, The system includes an upper magnetic core (1), a lower magnetic core (2), a central axis magnetic column (3), a first coil (4), a second coil (5), a third coil (6), and a fixed base plate (7). The lower magnetic core (2) is fixedly installed at the upper center of the fixed base plate (7). The upper magnetic core (1) consists of three first columns arranged in three equal parts to form a whole. The lower magnetic core (2) consists of three second columns arranged in three equal parts to form a whole. The first and second columns are spliced ​​together to form a coil column. The first coil (4), the second coil (5), and the third coil (6) are respectively wound on the three coil columns arranged in opposite parts. The central axis magnetic column (3) is fixed in the center on the lower magnetic core (2). The first coil (4), the second coil (5), and the third coil (6) have the same winding direction.

2. The three-phase broadband common-mode inductor structure with a composite magnetic core according to claim 1, characterized in that, The upper magnetic core (1) and the lower magnetic core (2) are ferrite magnetic cores, and the central axis magnetic column (3) is an amorphous nanocrystalline alloy magnetic core.

3. The three-phase wideband common-mode inductor structure with a composite magnetic core according to claim 2, characterized in that, In the low-frequency range, the magnetic reluctance of the amorphous nanocrystalline alloy core is 1-2 times that of the ferrite core; in the high-frequency range, the magnetic reluctance of the ferrite core is 5-30 times that of the amorphous nanocrystalline alloy core. Furthermore, in the low-frequency range, the ferrite core has extremely high initial permeability, while in the high-frequency range, the amorphous nanocrystalline alloy core has excellent permeability retention capability and extremely low core loss.

4. The three-phase broadband common-mode inductor structure with a composite magnetic core according to claim 1, characterized in that, The first coil (4), the second coil (5) and the third coil (6) are all wound with flat enameled copper wire. The fixed base plate (7) is an insulating structure with several slots (8) on it. The enameled wire plug pins of the first coil (4), the second coil (5) and the third coil (6) pass through and extend out of the slots (8).

5. The three-phase wideband common-mode inductor structure with a composite magnetic core according to claim 1, characterized in that, When the first coil (4), the second coil (5) and the third coil (6) are energized, the first coil (4), the second coil (5) and the third coil (6) are in phase and have the same current.

6. The three-phase wideband common-mode inductor structure with a composite magnetic core according to claim 1, characterized in that, The upper magnetic core (1) and the lower magnetic core (2) both have a limiting groove (9) in their inner cavity. The shape of the limiting groove (9) is adapted to the shape of the side end of the central axis magnetic column (3). The limiting groove (9) is used to fix and limit the central axis magnetic column (3), the upper magnetic core (1) and the lower magnetic core (2).

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