Inductance device and switching power supply

Abstract

The utility model provides an inductance device and a switching power supply. The inductance device comprises a magnetic core and a copper bar wound on the magnetic core. The magnetic core is of a closed annular structure. The copper bar is of a flat strip-shaped structure. The copper bars comprise a first copper bar and a second copper bar. And the first copper bars and the second copper bars are wound on the magnetic core for a plurality of circles. According to the inductance device and the switching power supply, the occupied space can be reduced, and the heat dissipation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of switching power supplies, in particular to an inductor device and a switching power supply. BACKGROUND

[0002] Switching power supplies are widely used in modern electronic devices, especially in scenarios requiring high efficiency and low power consumption, such as LED driving, power adapters, power tools, communication devices, etc. Switching power supplies usually need to use inductor devices to filter and isolate signals to maintain stability. Common-mode inductors, as one of the important inductor components, are used to suppress common-mode interference signals.

[0003] Conventional common-mode inductors usually adopt copper wire vertical winding, which requires a large space and limits the size and design flexibility of the inductor device. At the same time, this winding method has certain deficiencies in heat dissipation performance, especially under high-frequency working conditions, the heat of the inductor device cannot be quickly and effectively dissipated, which may cause the inductor to overheat and affect the stability and life of the power supply.

[0004] Therefore, it is necessary to provide an improved inductor device and switching power supply to solve the above problems. INNOVATION CONTENT

[0005] The application provides an inductor device and a switching power supply which reduce space occupation and improve heat dissipation efficiency.

[0006] The application discloses an inductor device, comprising a magnetic core and a copper bar wound on the magnetic core, the magnetic core is a closed ring structure, the copper bar is a flat strip structure, the copper bar comprises a first copper bar and a second copper bar, the first copper bar and the second copper bar are wound on the magnetic core for several turns.

[0007] Further, a magnetic middle column is located in the inner ring formed by the magnetic core, and the axial ends of the magnetic middle column are respectively connected to the opposite sides of the magnetic core.

[0008] Further, at least one end of the magnetic middle column in the axial direction is provided with a spacing piece between the magnetic middle column and the magnetic core, and the spacing piece is respectively bonded to the magnetic core and the magnetic middle column.

[0009] Further, the magnetic middle column comprises a plurality of sub-middle columns, the plurality of sub-middle columns are located on the same axis and are connected in sequence, and a spacing piece is arranged between adjacent two sub-middle columns, and the spacing piece is respectively bonded to the two sub-middle columns.

[0010] Further, the spacing piece comprises at least one of an epoxy sheet and a ceramic sheet.

[0011] Further, the first copper bar and the second copper bar are wound on the magnetic core with the same number of turns; the first copper bar and the second copper bar are wound on opposite sides of the magnetic core, respectively.

[0012] Further, the copper bar comprises a plurality of copper bar bodies, the plurality of copper bar bodies are stacked and connected at the ends, and an insulating layer is arranged between adjacent two copper bar bodies.

[0013] Further, the copper bar protrudes to form a pin at both ends in the length direction, and the pin is located outside the magnetic core.

[0014] Further, the outer side of the copper bar is covered with an insulating layer; the insulating layer is a polyimide film; and the thickness of the insulating layer ranges from 0.02mm to 0.1mm.

[0015] The application further discloses a switching power supply comprising the inductor device.

[0016] The inductor device and the switching power supply of the application can greatly reduce the space occupation by winding the copper bar with a flat strip structure on the magnetic core, compared with the traditional three-dimensional winding of copper wire, realize the flattening and compact setting of the inductor device, and optimize the overall space design. At the same time, since the flat strip copper bar has a large surface area, the heat dissipation capacity can be effectively improved, thereby improving the stability and service life of the inductor device and the switching power supply.

[0017] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the specification. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings incorporated into the specification and forming part of the specification, show embodiments consistent with the specification, and together with the specification serve to explain the principles of the specification.

[0019] Figure 1 is a perspective view of an embodiment of the inductor device of the application.

[0020] Figure 2 is a top view of the inductor device in Figure 1 .

[0021] Figure 3 is a perspective view of the copper bar in Figure 1 .

[0022] Figure 4 is an expanded plan view of the copper bar in Figure 3 .

[0023] Figure 5 is a perspective view of another embodiment of the inductor device of the application.

[0024] Figure 6 is Figure 5 a top view of an inductance device in

[0025] Figure 7 is a perspective view of still another embodiment of the inductance device of the present application.

[0026] Figure 8 is a perspective view of yet another embodiment of the inductance device of the present application.

[0027] BRIEF DESCRIPTION OF DRAWINGS

[0028] 10, magnetic core; 20, copper bar; 201, copper bar body; 202, pin; 21, first copper bar; 22, second copper bar; 30, magnetic core column; 31, sub-core column; 40, spacer. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments (or, modes of implementation) of the present application will be described clearly and completely in conjunction with the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated.

[0030] If the embodiments of the present application involve directional indications or positional relationships (for example, up, down, left, right, front, back, inner, outer, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships, movement conditions, etc. between components in a certain specific posture (as shown in the drawings); if the specific posture changes, the directional indications or positional relationships also change accordingly. In addition, the embodiments of the present application involve the terms "first", "second", etc., which are only used for convenience of description and cannot be understood as indicating or implying relative importance.

[0031] Next, the embodiments of the present application will be described in detail. Figure 1 The arrow direction in

[0032] As shown in Figure 1 and Figure 2 , the present application provides an inductance device, which includes a magnetic core 10 and a copper bar 20. The copper bar 20 is wound and arranged on the magnetic core 10.

[0033] The magnetic core 10 is in a closed loop structure. The model and shape of the magnetic core 10 can be flexibly selected according to actual needs, and a customized magnetic core shape and material can also be selected according to actual size and parameter requirements. In the embodiment, the magnetic core 10 is a 0782 amorphous magnetic core, which is arranged in a rectangular ring structure, and the four corners are rounded. In some cases, the magnetic core 10 can also be selected from ferrite cores, magnetic powder cores, nanocrystalline magnetic cores, etc. The magnetic core 10 can also be arranged in a circular ring structure.

[0034] Please refer to Figure 3 and Figure 4 The copper bar 20 is in a flat strip structure, which is integrally formed and then wound and assembled on the magnetic core 10 to form a common mode inductor. Compared with the traditional three-dimensional winding of copper wire, the flat strip copper bar 20 can greatly reduce the space occupation, realize the flattening and compact setting of the inductor device, and optimize the overall space design. At the same time, due to the relatively large surface area of the copper bar 20, the heat dissipation capacity can be effectively improved, thereby improving the stability and service life of the inductor device.

[0035] The copper bar 20 includes a plurality of layers of copper bar bodies 201. The plurality of layers of copper bar bodies 201 are arranged in a stacked manner, which can effectively reduce the loss caused by the high-frequency skin effect. The end portions of different copper bar bodies 201 are connected together and connected to other elements in the circuit. Adjacent two layers of copper bar bodies 201 are provided with an insulating layer (not shown in the figure) for separation to avoid short circuit. In the embodiment, the copper bar 20 includes two layers of copper bar bodies 201. In some cases, the number of layers of copper bar bodies 201 can also be single layer or more than two layers.

[0036] The copper bar 20 protrudes to form a pin 202 at both ends in the length direction, and different copper bar bodies 201 are connected at the pin 202. The pin 202 is located outside the magnetic core 10, which is convenient for connecting with other elements in the circuit, optimizes the position layout, and avoids the problem of too long copper bar 20 or inconvenient connection.

[0037] The outer side of the copper bar 20 is covered with an insulating layer, which enhances the durability and anti-interference ability of the common mode inductor device. In the embodiment, the insulating layer is a polyimide film, which not only has good insulating performance, but also can withstand high temperature environment, which is beneficial to improve the working stability. The thickness of the insulating layer ranges from 0.02 to 0.1 mm. Under normal circumstances, the insulating layer uses a thick bottom of 0.025 mm.

[0038] The thickness of the copper bar 20 ranges from 0.1 to 0.8 mm, and the width ranges from 10 to 30 mm. In the embodiment, the unfolded length of the copper bar 20 is about 520 mm. The dimensions of the copper bar 20 can be flexibly set according to actual needs.

[0039] As Figure 1 and Figure 2As shown, the copper bar 20 includes a first copper bar 21 and a second copper bar 22, both of which are wound on the magnetic core 10. Specifically, the number of turns of the copper bar 20 on the magnetic core 10 can be flexibly adjusted according to the length of the copper bar 20 and the size of the magnetic core 10. The first copper bar 21 and the second copper bar 22 have the same number of turns on the magnetic core 10, ensuring the balance of the common mode inductance as a whole, avoiding the problem of inconsistent performance due to different number of turns, and optimizing the working effect of the common mode inductance.

[0040] In this embodiment, the first copper bar 21 and the second copper bar 22 are wound on opposite sides of the magnetic core 10, which is beneficial to improve the balance of the overall structure of the inductance device and optimize the magnetic flux distribution. In some cases, the first copper bar 21 and the second copper bar 22 can also be arranged on adjacent sides of the magnetic core 10.

[0041] Further, as shown in Figure 5 and Figure 6 shown, the inductance device of this embodiment further includes a magnetic center column 30 based on the common mode inductance. The magnetic center column 30 is located in the inner circle formed by the magnetic core 10, and the axial ends thereof are respectively connected to the opposite sides of the magnetic core 10, forming a differential common mode integrated inductance. In this embodiment, the two ends of the magnetic center column 30 are connected to the two sides of the magnetic core 10 where the copper bar 20 is not wound, and the magnetic center column 30 and the magnetic core 10 are fixed by magnetic core adhesive. The material of the magnetic center column 30 is usually the same as that of the magnetic core 10.

[0042] In order to meet the electrical parameter requirements, a spacer 40 can be arranged on the differential mode inductance to form a center column air gap. The spacer 40 can be arranged at the upper and lower ends and / or the middle position of the magnetic center column 30.

[0043] In some cases, at least one end of the magnetic center column 30 and the magnetic core 10 are provided with a spacer 40, and the spacer 40 is adhered to the magnetic core 10 and the magnetic center column 30, respectively. As shown in Figure 7 , a spacer 40 is arranged between the two ends of the magnetic center column 30 and the magnetic core 10, forming two center column air gaps.

[0044] In some cases, the magnetic center column 30 includes a plurality of sub-center columns 31, which are located on the same axis and are connected in sequence. A spacer 40 is arranged between adjacent two sub-center columns 31, and the spacer 40 is adhered to the adjacent two sub-center columns 31, respectively. As shown in Figure 8 , the magnetic center column 30 is divided into two sub-center columns 31 by a spacer 40, and the differential common mode inductance has one center column air gap.

[0045] In some cases, the spacer 40 can also be arranged between the magnetic center column 30 and the magnetic core 10 and between the adjacent two sub-center columns 31. It can be understood that the number of spacers 40 is determined by the required differential mode inductance parameters.

[0046] The spacer 40 is made of insulating material, including at least one of epoxy sheet and ceramic sheet, which is not only resistant to high temperature, but also can effectively reduce electromagnetic interference of the inductance device. The spacer 40 has a certain thickness, which can pull apart the gap between the magnetic core 10 and the magnetic column 30 or between two adjacent sub-columns 31, to form a column air gap. The distance of a single column air gap ranges from 0.2mm to 2mm. By adjusting the thickness of the spacer 40, the distance of the column air gap can be adjusted, so that the size of the differential mode inductance can be adjusted to meet the electrical parameter requirements.

[0047] The application further provides a switching power supply comprising the inductance device as described above.

[0048] The inductance device and the switching power supply of the application can greatly reduce the space occupation by adopting the flat strip-shaped copper bar 20 wound on the magnetic core 10, compared with the traditional three-dimensional winding of copper wire, realizing the flatness and compact setting of the inductance device, and optimizing the overall space design. At the same time, since the surface area of the flat strip-shaped copper bar 20 is large, the heat dissipation capacity can be effectively improved, so as to improve the stability and service life of the inductance device and the switching power supply.

[0049] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of the application is not limited to the precise structure described in the above embodiments and shown in the drawings; any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the scope of protection of the application.

Claims

1. An inductive device, characterized by The magnetic core is in a closed ring structure, and the copper bars are in a flat strip structure, the copper bars include a first copper bar and a second copper bar, and the first copper bar and the second copper bar are wound on the magnetic core for several turns.

2. The inductive device of claim 1, wherein, The magnetic core column is located in the inner ring formed by the magnetic core, and the axial ends of the magnetic core column are connected with the opposite sides of the magnetic core, respectively.

3. The inductive device of claim 2, wherein, At least one end of the magnetic core column in the axial direction is provided with a spacer, and the spacer is bonded with the magnetic core and the magnetic core column, respectively.

4. The inductive device of claim 2, wherein, The magnetic core column includes a plurality of sub-core columns, the plurality of sub-core columns are located on the same axis and are connected in sequence, a spacer is arranged between adjacent two sub-core columns, and the spacer is bonded with the two sub-core columns, respectively.

5. The inductive device of any one of claims 3 or 4, wherein, The spacer includes at least one of an epoxy sheet and a ceramic sheet.

6. The inductive device of claim 1, wherein, The first copper bar and the second copper bar are wound on the magnetic core for the same number of turns, and the first copper bar and the second copper bar are wound on the opposite sides of the magnetic core, respectively.

7. The inductive device of claim 1, wherein, The copper bar includes a plurality of layers of copper bar bodies, the plurality of layers of copper bar bodies are stacked and connected at the ends, and an insulating layer is arranged between adjacent two layers of copper bar bodies.

8. The inductive device of claim 1, wherein, The copper bar protrudes to form a pin at both ends in the length direction, and the pin is located outside the magnetic core.

9. The inductive device of claim 1, wherein, The outer side of the copper bar is covered with an insulating layer, the insulating layer is a polyimide film, and the thickness of the insulating layer ranges from 0.02 mm to 0.1 mm.

10. A switching power supply, characterized by comprising: The inductance device includes any one of claims 1-9.

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