Inductor with magnetic shielding structure

Abstract

The utility model discloses an inductor with a magnetic shielding structure, and belongs to the technical field of inductors. The inductor comprises an inductor body, a magnetic shielding structure, an adjusting mechanism and a heat conduction insulating layer. The magnetic shielding structure is composed of at least two detachably connected magnetic shielding covers and wraps the inductor body to form a gap, and the gap is filled with a heat-conducting insulating material to improve heat dissipation and insulation performance; the adjusting mechanism adjusts the width of the gap through a screw so as to optimize the magnetic shielding effect. The problem that a traditional inductor is tedious to mount and dismount is solved through the design of the split type magnetic shielding cover, dynamic adaptation of the shielding effect is achieved by combining the gap width adjustable technology, meanwhile, the reliability is improved and the service life is prolonged through the heat conduction insulating layer, and the inductor is suitable for the fields such as high-frequency circuits and large-power power sources which have strict requirements for electromagnetic compatibility.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic components technical field, concretely relates to an inductor with magnetic shielding structure, and especially suitable for high frequency circuit, switching power supply and electromagnetic compatibility (EMC) sensitive equipment. BACKGROUND

[0002] As the core element of energy storage, filtering and resonance, the leakage magnetic field generated in the working process of inductor can cause problems such as adjacent circuit interference, increased iron loss and abnormal temperature rise. The traditional solution is to set an integral magnetic shielding cover outside the inductor, but it has the following defects:

[0003] 1. Difficult to install and maintain: the integral shielding cover needs to be wrapped after winding, which makes it difficult to disassemble when the inductor is repaired or the parameters are adjusted;

[0004] 2. Single shielding effect: fixed gap design cannot adapt to the best magnetic shielding demand under different frequencies or powers;

[0005] 3. Weak heat dissipation and insulation: there is lack of effective heat dissipation medium between the shielding cover and the inductor body, high temperature easily leads to decrease of magnetic permeability and insulation failure. SUMMARY

[0006] In view of the deficiencies of the prior art, the utility model provides a magnetic shielding inductor structure which is detachable, has adjustable shielding effect and high efficient heat dissipation capacity.

[0007] To achieve the above purpose, the utility model adopts the following technical scheme:

[0008] An inductor with a magnetic shielding structure comprises:

[0009] The inductor body is composed of a magnetic core and a winding, and the magnetic core is preferably iron-silicon-aluminum or nickel-zinc ferrite;

[0010] The magnetic shielding structure is connected by a buckle or magnetic attraction assembly, and the material is nanocrystalline soft magnetic alloy with high magnetic permeability (≥5000);

[0011] The adjusting mechanism is an adjusting screw arranged on the side wall of the magnetic shielding cover, which drives the displacement of the shielding cover relative to the inductor body by screwing, and adjusts the gap width (0.5-3 mm);

[0012] The heat-conducting insulation layer is a boron nitride composite material filled in the gap, with a thermal conductivity coefficient of ≥2.5 W / (m·K) and an insulation strength of ≥20 kV / mm.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] Modular disassembly: split magnetic shielding cover supports independent replacement of inductance body and shielding structure, reduces maintenance cost;

[0015] Dynamic shielding optimization: adjust the gap width by adjusting the screw to match the magnetic resistance to the working frequency, and the measured leakage magnetic field is reduced by 40%-70%;

[0016] Enhanced thermal management: the coil temperature rise is controlled to be ≤15℃ (measured value), and the service life is extended by more than 2 times. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 : the utility model discloses a three-dimensional exploded view.

[0018] Illustrated components: 1-inductance body (11-magnetic core, 12-coil), 2-magnetic shielding structure (211-upper cover, 212-lower cover, 213-buckle, 214-magnetic suction assembly, 215-screw, 216-guide groove), 3-adjusting mechanism (31-adjusting screw), 4-heat-conducting insulation layer. DETAILED DESCRIPTION

[0019] The technical scheme in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0020] As shown in Figure 1 An inductance with a magnetic shielding structure includes: an inductance body 1 composed of a magnetic core 11 and a coil 12 wound on the magnetic core; a magnetic shielding structure 2 including at least two detachably connected magnetic shielding covers 21, the magnetic shielding cover 21 being wrapped outside the inductance body 1, and a gap 22 being formed between the inner wall of the magnetic shielding cover 21 and the outer wall of the inductance body 1; an adjusting mechanism 3 arranged on the magnetic shielding cover 21 for adjusting the width of the gap 22; and a heat-conducting insulation layer 4 filled in the gap 22 and made of a material with a thermal conductivity ≥1.5 W / (m·K) and an insulation strength ≥15 kV / mm.

[0021] The magnetic shielding cover 21 includes an upper cover 211 and a lower cover 212, and the upper cover 211 and the lower cover 212 are detachably connected by at least one of a buckle 213, a magnetic suction assembly 214 or a screw 215.

[0022] ​The adjusting mechanism 3 comprises at least one adjusting screw 31 which penetrates the sidewall of the magnetic shield 21 and abuts against the outer wall of the inductor body 1, and the width of the gap 22 is changed by screwing the adjusting screw 31.

[0023] The inner wall of the magnetic shield 21 is provided with a guide groove 216 in which the end of the adjusting screw 31 is embedded to limit the moving direction of the adjusting screw 31.

[0024] The material of the heat-conducting insulation layer 4 is one of silica gel, epoxy resin or boron nitride composite material.

[0025] The magnetic shield 21 is made of ferrite, permalloy or nanocrystalline soft magnetic material, and the relative magnetic permeability is ≥5000.

[0026] The width of the gap 22 is adjusted in the range of 0.5-3 mm.

[0027] Assembly process:

[0028] The inductor body (1) after being wound is placed in the lower cover body (212), boron nitride composite material is filled to 80% of the height of the gap (22), the upper cover body (211) is buckled and locked by the buckle (213), and the adjusting screw (31) is screwed into contact with the inductor body (1).

[0029] Shielding adjustment:

[0030] High-frequency application (>1 MHz): unscrew the screw (31) counterclockwise to expand the gap to 2-3 mm to reduce eddy current loss; large current application: screw the screw (31) clockwise to narrow the gap to 0.5-1 mm to enhance the leakage magnetic suppression.

[0031] Material selection:

[0032] Magnetic shield: nanocrystalline soft magnetic alloy (1K107B), thickness 1.2 mm; heat-conducting insulation layer: boron nitride volume fraction 30% silica gel composite material, hardness Shore A 50±5 after curing.

[0033] Experimental data

[0034] Compared with the traditional integral shielding inductor, the leakage magnetic flux density of the embodiment is reduced from 15 mT to 4.2 mT under the condition of 100 kHz; after running for 1 hour under full load, the coil temperature is reduced from 82℃ to 63℃, and the insulation resistance is maintained ≥100 MΩ.

[0035] Working principle: screwing the adjusting screw 31 pushes the upper cover body 211 to move along the guide groove 216 to change the width of the gap 22, while the heat-conducting insulation layer 4 is kept tightly filled.

[0036] It will be obvious to a person skilled in the art that the application is not limited to the details of the above-described exemplary embodiments, but that the application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments should, therefore, be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalents of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims concerned.

[0037] Furthermore, it should be understood that although the present specification is described in terms of embodiments, not every embodiment according to the present specification need necessarily include every technological feature or combination of technological features. Such description of the specification in terms of embodiments is for illustrative purposes only and the skilled person should consider the specification as a whole when applying the principles of the embodiments to other embodiments.

Claims

1. An inductor having a magnetic shield structure, characterized by, The application relates to an inductor, which comprises: an inductor body (1) composed of a magnetic core (11) and a coil (12) wound on the magnetic core; a magnetic shielding structure (2) comprising at least two detachably connected magnetic shielding covers (21), the magnetic shielding covers (21) being wrapped outside the inductor body (1), and a gap (22) being formed between the inner wall of the magnetic shielding cover (21) and the outer wall of the inductor body (1); an adjusting mechanism (3) arranged on the magnetic shielding cover (21) and used for adjusting the width of the gap (22); and a heat-conducting insulation layer (4) filled in the gap (22) and made of a material with a heat conductivity coefficient greater than or equal to 1.5 W / (m.K) and an insulation strength greater than or equal to 15 kV / mm. The magnetic shielding cover (21) comprises an upper cover body (211) and a lower cover body (212), and the upper cover body (211) and the lower cover body (212) are detachably connected through at least one of a buckle (213), a magnetic attraction assembly (214) or a screw (215).

2. The inductor with a magnetic shielding structure according to claim 1, characterized in that, The adjusting mechanism (3) comprises at least one adjusting screw (31), the adjusting screw (31) penetrates through the side wall of the magnetic shielding cover (21) and abuts against the outer wall of the inductor body (1), and the width of the gap (22) is changed by screwing the adjusting screw (31).

3. The inductor with a magnetic shielding structure according to claim 2, wherein, The inner wall of the magnetic shielding cover (21) is provided with a guide groove (216), and the end of the adjusting screw (31) is embedded in the guide groove (216) to limit the moving direction of the adjusting screw (31).

4. The inductor with a magnetic shielding structure according to claim 3, wherein, The material of the heat-conducting insulation layer (4) is one of silica gel, epoxy resin or boron nitride composite material.

5. The inductor with a magnetic shielding structure according to claim 1, wherein, The magnetic shielding cover (21) is made of ferrite, permalloy or nanocrystalline soft magnetic material, and the relative magnetic permeability is greater than or equal to 5000.

6. The inductor with magnetic shielding structure according to claim 1, wherein, The width adjusting range of the gap (22) is 0.5-3 mm.

7. The inductor with magnetic shielding structure according to claim 1, wherein, ​

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