Spiral flat coil and inductor

Abstract

The spiral flat coil comprises a coil body, the coil body is of a spiral structure formed by winding a flat metal strip, one end of the metal strip is arranged inside the spiral structure, and the other end of the metal strip is arranged outside the spiral structure. And the screw extends into the spiral structure from the bottom of the spiral structure. The coil body is of a spiral structure formed by winding a flat metal strip, the coil is of a planar structure, three-dimensional winding is not needed, the size is reduced by 40%, the coil is suitable for high-density integration, meanwhile, the contact area of the magnetic body and the coil is large, the temperature heat dissipation performance of the coil is improved, and the vibration resistance and impact resistance of a product are excellent.

Description

Technical Field

[0001] This utility model belongs to the field of inductor technology, specifically relating to a spiral flat coil and an inductor. Background Technology

[0002] In electronic devices, inductors are important electronic components and are widely used in various scenarios such as power supply circuits and filtering circuits.

[0003] In existing technologies, inductors are generally made using a three-dimensional winding method. Due to the process characteristics, multiple layers need to be stacked, which results in a large overall space occupied by the inductor. Furthermore, the small contact area between the coil and the magnetic body leads to heat accumulation and poor heat dissipation. Utility Model Content

[0004] The purpose of this invention is to propose a spiral flat coil and inductor to solve the problems of large overall space occupation and poor heat dissipation of inductors in the prior art.

[0005] Therefore, this utility model provides a spiral flat coil, comprising: a coil body, wherein the coil body is formed by winding a flat metal strip to form a spiral structure, one end of the metal strip is inside the spiral structure, and the other end of the metal strip is outside the spiral structure and extends from the bottom of the spiral structure to the inside of the spiral structure.

[0006] Preferably, the metal strip has a first bend and a second bend at both ends, and the extension directions of the first bend and the second bend are parallel to the axial direction of the spiral structure.

[0007] Preferably, the first bent portion and the second bent portion are disposed on opposite sides of the axis of the spiral structure.

[0008] Preferably, the diameter of the spiral structure formed by the coil body gradually increases from the inside to the outside.

[0009] Preferably, the spiral structure formed by the coil body gradually decreases in height from the inside to the outside.

[0010] Preferably, the spiral structure formed by the coil body has a spacing between adjacent turns.

[0011] Preferably, the surface of the coil body is plated with a coating.

[0012] Preferably, the material of the coating is silver or tin.

[0013] Preferably, the surface of the coating is provided with a high-temperature insulating adhesive layer.

[0014] Secondly, an inductor is provided, including a housing, electrodes, and a spiral flat coil, wherein the coil body is inside the housing, and both ends of the coil body extend outside the housing; two electrodes are provided, which are fixedly connected to the two ends of the coil body respectively, and extend in opposite directions.

[0015] Beneficial effects:

[0016] 1. This utility model provides a spiral flat coil and inductor. The coil body is formed by winding a flat metal strip to form a spiral structure. The coil has a planar structure, eliminating the need for three-dimensional winding and reducing the volume by 40%, making it suitable for high-density integration. At the same time, the contact area between the magnetic body and the coil is large, increasing the coil's heat dissipation and providing excellent vibration and shock resistance.

[0017] 2. The coil body is plated with a contact resistance layer and fixed with a high-temperature insulating adhesive layer. It adopts a magnetic shielding design to improve the withstand voltage level, reduce magnetic coupling and interference between coils, and reduce the impact of noise signals. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment 1 of the present invention, which provides a spiral flat coil.

[0020] Figure 2 A cross-sectional view of Embodiment 1 of a spiral flat coil provided by this utility model.

[0021] Figure 3 This is a schematic diagram showing the connection between the coil body and the electrodes of an embodiment 1 of the inductor provided by this utility model.

[0022] Figure 4 This is a schematic diagram of the structure of an embodiment 1 of the inductor provided by this utility model.

[0023] In the figure, 1-coil body, 11-spiral structure, 12-first bend, 13-second bend, 14-plating layer, 15-high temperature insulating adhesive layer, 2-outer shell, 3-electrode. Detailed Implementation

[0024] The following detailed description of preferred embodiments of the present invention, along with the included examples, will make the content of the present invention more readily understood. Unless otherwise specified, 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. In case of any conflict, the definitions in this specification shall prevail.

[0025] Example 1:

[0026] Provided such as Figures 1-2 The diagram shows a spiral flat coil and inductor, including a coil body 1. The coil body 1 is formed by winding a flat metal strip to form a spiral structure 11. One end of the metal strip is inside the spiral structure 11, and the other end of the metal strip is outside the spiral structure 11, extending from the bottom of the spiral structure 11 to the inside of the spiral structure 11.

[0027] The metal strip has a first bend 12 and a second bend 13 at both ends. The extension directions of the first bend 12 and the second bend 13 are parallel to the axial direction of the spiral structure 11. The first bend 12 and the second bend 13 are arranged opposite each other on both sides of the axial direction of the spiral structure 11. The metal strip is made of copper or a copper alloy, and the first bend 12 and the second bend 13 are used to connect electrodes.

[0028] The spiral structure 11 formed by the coil body 1 has a gradually increasing diameter from the inside to the outside. The spiral structure 11 formed by the coil body 1 has a gradually decreasing height from the inside to the outside. A spacing is provided between adjacent turns of the spiral structure 11 formed by the coil body 1. The thickness of the metal strip of the coil body 1 is 0.2 μm, and the height difference between each turn of the spiral structure 11 of the coil body 1 is 0.2 ± 0.1 mm, controlling the overall volume of the coil body 1. The number of turns of the spiral structure 11 of the coil body 1 is used to determine the main conductivity inductance value, balancing DCR and SRF; the spacing between adjacent turns affects parasitic capacitance and heat dissipation, and needs to be appropriately widened under high-frequency conditions. The inner diameter of the spiral structure 11 of the coil body 1 is used to adjust the magnetic circuit and heat dissipation, avoiding saturation and process risks.

[0029] The surface of the coil body 1 is plated with a plating layer 14. The material of the plating layer 14 is silver or tin. The plating layer 14 is used to reduce contact resistance.

[0030] A high-temperature insulating adhesive layer 15 is provided on the surface of the plating layer 14. The high-temperature insulating adhesive layer 15 is used to improve the withstand voltage level and the bonding force between the coil and the powder after molding, and to reduce electromagnetic interference.

[0031] Secondly, such as Figures 3-4As shown, an inductor is provided, including a housing 2, electrodes 3 and a spiral flat coil. The coil body 1 is inside the housing 2, and both ends of the coil body 1 extend outside the housing 2. Two electrodes 3 are provided, which are fixedly connected to the two ends of the coil body 1 respectively, and extend in opposite directions.

[0032] The outer shell 2 is made of soft magnetic composite material. After the electrode 3 is connected to the first bent part 12 and the second bent part 13 of the coil body 1, the electrode 3 is flattened and made perpendicular to the first bent part 12 and the second bent part 13. The coil body 1 is placed in a mold containing soft magnetic composite material powder, and the outer shell 2 is formed by baking and curing, and the coil body 1 is tightly bonded to the outer shell 2.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application 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. These 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 application.

Claims

1. A spiral flat coil, characterized in that, include: The coil body is formed by winding a flat metal strip to form a spiral structure. One end of the metal strip is inside the spiral structure, and the other end of the metal strip is outside the spiral structure, extending from the bottom of the spiral structure to the inside of the spiral structure.

2. A spiral flat coil according to claim 1, characterized in that, The metal strip has a first bend and a second bend at both ends, and the extension directions of the first bend and the second bend are parallel to the axial direction of the spiral structure.

3. A spiral flat coil according to claim 1, characterized in that, The first bent portion and the second bent portion are disposed on opposite sides of the axis of the spiral structure.

4. A spiral flat coil according to claim 1, characterized in that, The spiral structure formed by the coil body gradually increases in diameter from the inside to the outside.

5. A spiral flat coil according to claim 1, characterized in that, The spiral structure formed by the coil body gradually decreases in height from the inside to the outside.

6. A spiral flat coil according to claim 1, characterized in that, The spiral structure formed by the coil body has a spacing between adjacent turns.

7. A spiral flat coil according to claim 1, characterized in that, The surface of the coil body is plated with a coating.

8. A spiral flat coil according to claim 6, characterized in that, The coating material is silver or tin.

9. A spiral flat coil according to claim 7 or 8, characterized in that, A high-temperature insulating adhesive layer is provided on the surface of the coating.

10. An inductor, characterized in that, The device includes a housing, electrodes, and a spiral flat coil as described in any one of claims 1-9, wherein the coil body is inside the housing, both ends of the coil body extend outside the housing, and two electrodes are provided, which are fixedly connected to both ends of the coil body and extend in opposite directions.

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