SQ type nanocrystalline common mode inductor

Abstract

The utility model discloses an SQ type nanocrystalline common mode inductor, which relates to the technical field of common mode inductors and comprises a flat coil, a rectangular nanocrystalline magnetic ring and a heat dissipation shell. The flat coil is wound on the rectangular nanocrystalline magnetic ring; the flat coil and the rectangular nanocrystalline magnetic ring are arranged in the heat dissipation shell; a wire passing hole is formed in a base of the heat dissipation shell, and the two ends of the flat coil penetrate through the wire passing hole formed in the base to form welding pins; heat dissipation fins are arranged on an upper cover of the heat dissipation shell; and the heat dissipation shell is filled with insulating heat-conducting glue. While the size of the common mode inductor is reduced, the heat dissipation capability and the current and voltage impact resistance capability of the common mode inductor are improved, so that the requirements of miniaturization, integration and high power of an electronic system are met.

Description

Technical Field

[0001] The utility model relates to the technical field of common mode inductors, and more specifically to an SQ type nanocrystalline common mode inductor. Background Art

[0002] Common-mode inductors, also called common-mode yoke coils, usually include coils of the same direction wrapped around the same magnetic core. They are widely used in communication equipment, power systems, electronic equipment and other fields. They are one of the important components for achieving filtering, isolating interference and improving signal quality in circuits.

[0003] With the rapid development of power and electronic information technology, electronic systems are developing towards miniaturization and integration, which puts forward higher requirements on the volume, resistance to current and voltage shock, and heat dissipation of common-mode inductors. However, conventional common-mode inductors are usually made of enameled wire wound on a circular magnetic ring in multiple layers. The enameled wire has poor heat dissipation performance and high temperature rise. The closely contacted part of the coil is easy to break down, resulting in insufficient resistance to voltage and current shock of the common-mode inductor. The circular magnetic ring occupies a relatively large space as a whole, which is not conducive to the miniaturization of the common-mode inductor.

[0004] Therefore, how to reduce the volume of the common-mode inductor while improving the heat dissipation and current and voltage impact resistance capabilities of the common-mode inductor is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the utility model provides an SQ-type nanocrystalline common-mode inductor, which improves the space factor and maximum current per unit volume of the common-mode inductor through a single-layer flat coil wound with flat wire and a rectangular nanocrystalline magnetic ring, and improves the heat dissipation capacity of the common-mode inductor through a heat dissipation housing, thereby reducing the volume of the common-mode inductor while improving the heat dissipation and resistance to current and voltage shocks.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The utility model discloses an SQ type nanocrystalline common mode inductor, comprising: a flat coil, a rectangular nanocrystalline magnetic ring, and a heat dissipation shell;

[0008] The flat coil is wound around the rectangular nanocrystalline magnetic ring;

[0009] The flat coil and the rectangular nanocrystalline magnetic ring are both placed in the heat dissipation housing;

[0010] The base of the heat dissipation housing is provided with a wire-passing hole, and the two ends of the flat coil pass through the wire-passing hole provided on the base to form welding pins;

[0011] The upper cover of the heat dissipation housing is provided with heat dissipation fins;

[0012] The heat dissipation shell is filled with insulating heat-conducting glue.

[0013] Preferably, the flat coil is wound in one layer.

[0014] Preferably, the flat coil comprises a first flat coil and a second flat coil, and the first flat coil and the second flat coil are symmetrically wound on the rectangular nanocrystalline magnetic ring.

[0015] Preferably, the rectangular nanocrystalline magnetic ring is coated with an epoxy powder insulation layer.

[0016] Preferably, the base is connected to the upper cover by means of matching slots and protrusions; the base is embedded in the upper cover so that the lower surface of the base and the lower edge of the upper cover are in the same horizontal plane; and a fixed welding foot is provided on the lower edge of the upper cover.

[0017] Preferably, a central column is provided inside the upper cover, and the upper cover and the central column form an annular space, and the annular space is adapted to the rectangular nanocrystalline magnetic ring wound around the flat coil; the central column and the upper cover are integrally formed.

[0018] Preferably, grooves are provided inside the center column and the upper cover, and the insulating heat sink is clamped by the grooves; the insulating heat sink is flat U-shaped as a whole, the outer edge of the U-shape is matched with the groove, and the inner edge of the U-shape is matched with the cross-section of the rectangular nanocrystalline magnetic ring.

[0019] Preferably, the number of the grooves is the same as the number of gaps of the flat coil, the spacing distance of the grooves is the same as the spacing distance of the gaps of the flat coil, and the thickness of the insulating heat sink is smaller than the gaps of the flat coil, so that the insulating heat sinks are located one by one in the gaps of the flat coil.

[0020] Preferably, the insulating heat sink and the base are both made of thermally conductive ceramic materials.

[0021] Preferably, mounting holes are provided at positions corresponding to the upper cover and the central column, and auxiliary heat sinks are fixedly mounted through the mounting holes.

[0022] Through the above technical solutions, it can be known that compared with the prior art, the utility model discloses a SQ type nanocrystalline common mode inductor. Among them, the magnetic ring is a rectangular nanocrystalline magnetic ring, and the rectangle can effectively improve the space factor of the common mode inductor. The nanocrystalline magnetic ring has a high initial magnetic permeability, saturation magnetic induction intensity and good dynamic characteristics, thereby reducing the volume while ensuring the impedance characteristics of the common mode inductor; the coil is a flat coil wound by a flat wire, which has the advantages of good high-frequency skin effect, large unit current density and good heat dissipation, thereby reducing the volume of the common mode inductor while improving the ability to resist current shock; the common mode inductor is also provided with a heat dissipation shell, which can effectively ensure the heat dissipation capacity of the common mode inductor, and an insulating heat conductive sheet in contact with the heat dissipation shell is also provided in the gap of the flat coil, which improves the insulation and voltage shock resistance of the coil while improving the heat dissipation capacity of the common mode inductor. While reducing the volume of the common mode inductor, the utility model improves the heat dissipation and current and voltage shock resistance of the common mode inductor, thereby meeting the miniaturization, integration and high power requirements of the electronic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0024] Figure 1 This is a front view of the overall structure provided for this practical embodiment.

[0025] Figure 2 This is a bottom view of the overall structure provided for this practical embodiment.

[0026] Figure 3 The top view provided for this practical embodiment does not include the upper cover.

[0027] Figure 4 This is a bottom view of the upper cover provided in this practical embodiment.

[0028] Figure 5 Schematic diagram of the insulating heat sink provided in this practical embodiment.

[0029] In the figure, 1. rectangular nanocrystalline magnetic ring; 2. base; 3. wire hole; 4. welding pin; 5. upper cover; 6. heat sink fin; 7. first flat coil; 8. second flat coil; 9. fixed welding foot; 10. center column; 11. groove; 12. insulating heat sink; 13. mounting hole. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] The utility model embodiment discloses an SQ type nanocrystalline common mode inductor, such as Figure 1 As shown, it includes: a flat coil, a rectangular nanocrystalline magnetic ring 1, and a heat dissipation shell;

[0032] The flat coil is wound around the rectangular nanocrystalline magnetic ring 1;

[0033] The flat coil and the rectangular nanocrystalline magnetic ring 1 are both placed in the heat dissipation housing;

[0034] A wire-passing hole 3 is provided on the base 2 of the heat dissipation housing, and two ends of the flat coil pass through the wire-passing hole 3 provided on the base 2 to form a welding pin 4;

[0035] The upper cover 5 of the heat dissipation housing is provided with heat dissipation fins 6;

[0036] The heat dissipation housing is filled with insulating thermally conductive glue.

[0037] In a specific embodiment, the rectangular nanocrystalline magnetic ring 1 is an iron core wound by a strip with a thickness between 12-28um, which can more effectively reduce magnetic leakage; when the thickness of the strip is between 12-14um, the inductor has better high-frequency characteristics and impedance characteristics.

[0038] In a specific embodiment, the flat coil is wound with one layer. Specifically, the flat coil is wound with flat copper wire, which has a good skin effect. Compared with traditional enameled wire, it can reduce the current accumulation on the surface of the wire and improve the unit current density of the coil; and the flat coil has a good space factor, so that the coil has the advantages of large current and small volume.

[0039] In a specific embodiment, Figure 2-3 As shown, the flat coil includes a first flat coil 7 and a second flat coil 8, and the first flat coil 7 and the second flat coil 8 are symmetrically wound on the rectangular nanocrystalline magnetic ring 1. Specifically, both ends of the flat wires of the first flat coil 7 and the second flat coil 8 pass through the corresponding wire holes on the base to form four welding pins 4.

[0040] In a specific embodiment, the rectangular nanocrystalline magnetic ring 1 is coated with an epoxy powder insulation layer. The epoxy powder insulation layer can enhance the insulation between the coil and the magnetic ring and improve the inductor's ability to resist voltage shock.

[0041] In a specific embodiment, the base 2 and the upper cover 5 are connected by matching slots and protrusions; the base 2 is embedded in the upper cover 5 so that the lower surface of the base 2 and the lower edge of the upper cover 5 are in the same horizontal plane; the lower edge of the upper cover 5 is provided with a fixed welding foot 9. After the base 2 and the upper cover 5 are tightly connected, an integrally closed shell is formed, and the lower surface of the base 2 can also be coated with a metal shielding layer, and with the metal upper cover 5, the heat dissipation shell has electromagnetic shielding ability, reducing electromagnetic noise radiation interference; by providing the fixed welding foot 9, the heat dissipation shell is fixed to improve the firmness of the inductor.

[0042] In a specific embodiment, Figure 4 As shown, a central column 10 is provided inside the upper cover 5 , and the upper cover 5 and the central column 10 form an annular space, which is adapted to the rectangular nanocrystalline magnetic ring 1 wound with a flat coil; the central column 10 and the upper cover 5 are integrally formed.

[0043] In a specific embodiment, the center column 10 and the upper cover 5 are both provided with a groove 11, and the insulating heat sink 12 is clamped by the groove 11; the insulating heat sink 12 is flat U-shaped as a whole, such as Figure 5 As shown, the U-shaped outer edge is matched with the groove 11 , and the U-shaped inner edge is matched with the cross section of the rectangular nanocrystalline magnetic ring 1 .

[0044] In a specific embodiment, the number of grooves 11 is the same as the number of gaps of the flat coil, the spacing distance of the grooves 11 is the same as the spacing distance of the gaps of the flat coil, and the thickness of the insulating heat sink 12 is less than the gap of the flat coil, so that the insulating heat sink 12 is located in the gap of the flat coil one by one. The insulating heat sink 12 can not only speed up the heat extraction of the coil and assist in heat dissipation, enhance the insulation between the coils, and improve the ability to resist voltage shock; at the same time, during the inductor assembly process, it can also play a role in limiting the rectangular nanocrystalline magnetic ring 1 and the flat coil, so that the distance between the flat coil and the heat dissipation shell is uniform and consistent, ensuring the insulation between the coil and the shell.

[0045] In a specific embodiment, the insulating heat sink 12 and the base 2 are both made of thermally conductive ceramic materials, such as aluminum oxide, boron nitride, aluminum nitride composite materials, beryllium oxide and aluminum nitride. Compared with insulating thermally conductive adhesives, thermally conductive ceramic materials have better thermal conductivity, so that the inductor has better heat dissipation ability.

[0046] In a specific embodiment, mounting holes 13 are provided at positions corresponding to the upper cover 5 and the central column 10, and auxiliary heat sinks are fixedly installed through the mounting holes 13, thereby meeting different requirements of different electronic systems for inductor heat dissipation and volume.

[0047] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0048] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An SQ type nanocrystalline common mode inductor, characterized in that: include: A flat coil, a rectangular nanocrystalline magnetic ring (1), and a heat dissipation housing; The flat coil is wound around the rectangular nanocrystalline magnetic ring (1); The flat coil and the rectangular nanocrystalline magnetic ring (1) are both placed in the heat dissipation housing; A wire-passing hole (3) is provided on the base (2) of the heat dissipation housing, and two ends of the flat coil pass through the wire-passing holes (3) provided on the base (2) to form welding pins (4); The upper cover (5) of the heat dissipation housing is provided with heat dissipation fins (6); The heat dissipation shell is filled with insulating heat-conducting glue.

2. The SQ type nanocrystalline common mode inductor according to claim 1, characterized in that: The flat coil is wound in one layer.

3. The SQ type nanocrystalline common mode inductor according to claim 1, characterized in that: The flat coil comprises a first flat coil (7) and a second flat coil (8), and the first flat coil (7) and the second flat coil (8) are symmetrically wound on the rectangular nanocrystalline magnetic ring (1).

4. The SQ type nanocrystalline common mode inductor according to claim 1, characterized in that: The rectangular nanocrystalline magnetic ring (1) is coated with an epoxy powder insulation layer.

5. The SQ type nanocrystalline common mode inductor according to claim 1, characterized in that: The base (2) and the upper cover (5) are snap-connected via matching slots and protrusions; the base (2) is embedded in the upper cover (5) so that the lower surface of the base (2) and the lower edge of the upper cover (5) are in the same horizontal plane; and a fixing welding foot (9) is provided on the lower edge of the upper cover (5).

6. The SQ type nanocrystalline common mode inductor according to claim 1, characterized in that: A central column (10) is provided inside the upper cover (5), and the upper cover (5) and the central column (10) form an annular space, and the annular space is compatible with the rectangular nanocrystalline magnetic ring (1) wound around the flat coil; the central column (10) and the upper cover (5) are integrally formed.

7. The SQ type nanocrystalline common mode inductor according to claim 6, characterized in that: The center column (10) and the upper cover (5) are both provided with grooves (11) inside, and the insulating heat sink (12) is clamped through the grooves (11); the insulating heat sink (12) is overall in a flat U-shape, the outer edge of the U-shape is matched with the groove (11), and the inner edge of the U-shape is matched with the cross section of the rectangular nanocrystalline magnetic ring (1).

8. The SQ type nanocrystalline common mode inductor according to claim 7, characterized in that: The number of the grooves (11) is the same as the number of the gaps of the flat coil, the spacing distance of the grooves (11) is the same as the spacing distance of the gaps of the flat coil, and the thickness of the insulating heat sink (12) is smaller than the gaps of the flat coil, so that the insulating heat sinks (12) are located one by one in the gaps of the flat coil.

9. The SQ type nanocrystalline common mode inductor according to claim 7, characterized in that: The insulating heat sink (12) and the base (2) are both made of thermally conductive ceramic materials.

10. The SQ type nanocrystalline common mode inductor according to claim 6, characterized in that: Mounting holes (13) are provided at positions corresponding to the upper cover (5) and the central column (10), and auxiliary heat sinks are fixedly mounted through the mounting holes (13).

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