Inductor structure, circuit board and electronic device

Abstract

An inductor structure, a circuit board and an electronic device. The inductor structure comprises a magnetic core leg (100) and a wire (200), wherein the magnetic core leg (100) comprises a first portion (110), a second portion (120) and a third portion (130), which are sequentially arranged in a first direction; the first portion (110) has a first side wall (111) facing away from the second portion (120); the third portion (130) has a second side wall (131) facing away from the second portion (120); the wire (200) is wound around the magnetic core leg (100) and is configured to be electrically connected to the circuit board; and the first side wall (111) and / or the second side wall (131) are / is curved. A curved structure helps to reduce a space occupied by the magnetic core leg (100), such that the number of turns of the suction wire (200) can be increased within a limited packaging space, thereby improving the inductance of the inductor structure. In addition, the range of the length-to-width ratio of a first cross section (121) of the second portion (120) is also defined. Compared with a structure having a square cross section, the second portion (120) can form a larger cross-sectional area, thereby increasing the inductance of the inductor structure.

Description

Inductor structure, circuit board and electronic equipment Technical Field

[0001] The present application relates to the technical field of inductor devices, and in particular to an inductor structure, a circuit board, and an electronic device. Background Art

[0002] Inductors, as crucial components in electronic circuits, often play key roles in energy storage, filtering, and tuning. Chip inductors, as surface-mount high-power inductors, are widely used in various electronic devices due to their compact size, high quality, high energy storage, and low resistance. Inductance is a core parameter of an inductor and directly impacts its performance. Therefore, increasing inductance has always been a constant goal in inductor technology.

[0003] The current inductor structure has limited energy storage capacity, which affects the improvement of inductance. Therefore, there is an urgent need for an inductor structure, circuit board and electronic device with larger inductance. Technical issues

[0004] One of the purposes of the embodiments of the present application is to provide an inductor structure, a circuit board, and an electronic device, so that the inductor structure can have a larger inductance. Technical Solutions

[0005] The technical solution adopted in the embodiment of this application is:

[0006] In a first aspect, the present application provides an inductor structure, comprising:

[0007] A magnetic core column, wherein the magnetic core column comprises a first portion, a second portion, and a third portion sequentially arranged along a first direction, wherein the first direction is perpendicular to a length direction of the magnetic core column;

[0008] A conductor, the conductor being wound around the magnetic core column and being used for electrically connecting to a circuit board;

[0009] Wherein, the first part has a first side wall facing away from the second part, and the third part has a second side wall facing away from the second part; the first side wall and / or the second side wall are arranged in a curved shape;

[0010] The second portion has a first cross-section perpendicular to the length direction, the first cross-section is rectangular; and the length and width of the first cross-section meet the following conditions:

[0011] H / M∈(1.2, 1.8); H is the length of the first cross section, in mm; M is the width of the first cross section, in mm.

[0012] In one embodiment of the present application, the length and width of the first cross section satisfy the following conditions: H∈(1.8, 2.7); M∈(1, 2.2).

[0013] In one embodiment of the present application, the first portion has a second cross-section perpendicular to the length direction, and the third portion has a third cross-section perpendicular to the length direction; the second cross-section and / or the third cross-section is semi-elliptical.

[0014] In one embodiment of the present application, the major axis length and the minor axis length of the second cross section satisfy the following conditions:

[0015] a1 / b1∈(1.3, 2.5); a1 is the length of the major axis of the second cross section, in mm; b1 is the length of the minor axis of the second cross section, in mm;

[0016] And / or, the major axis length and minor axis length of the third cross section meet the following conditions:

[0017] a2 / b2∈(1.3, 2.5); a2 is the length of the major axis of the second cross section, in mm; b2 is the length of the minor axis of the second cross section, in mm.

[0018] In one embodiment of the present application, the major axis length and the minor axis length of the second cross section satisfy the following conditions: a1∈(0.9, 1.3); b1∈(0.4, 0.8);

[0019] And / or, the major axis length and the minor axis length of the third cross section satisfy the following conditions: a2∈(0.9, 1.3); b2∈(0.4, 0.8).

[0020] In one embodiment of the present application, the first portion and the third portion have the same structure and are symmetrical with respect to a center point of the second portion.

[0021] In one embodiment of the present application, the first part, the second part and the third part are an integrally formed structure.

[0022] In one embodiment of the present application, the inductor structure includes a base having a first surface and a second surface facing away from each other;

[0023] The magnetic core column is arranged on the first surface, the conductive wire is arranged on the magnetic core column, and at least one end of the conductive wire extends to the second surface.

[0024] In one embodiment of the present application, the wire has a first end and a second end that are oppositely disposed, and both the first end and the second end extend to the second surface and are used for soldering connection with the circuit board.

[0025] In one embodiment of the present application, the base has a plurality of side portions connected to the first surface and the second surface, and the first end portion and the second end portion extend to the second surface along the same any one of the side portions.

[0026] In one embodiment of the present application, the conductor is a flat conductor having a flat side surface, and the flat side surface is attached to the magnetic core column.

[0027] In one embodiment of the present application, the inductor structure further includes a magnetic matrix, which fills and covers the magnetic core column and the wire;

[0028] The magnetic permeability of the magnetic matrix is ​​different from the magnetic permeability of the magnetic core column.

[0029] In one embodiment of the present application, the magnetic permeability of the magnetic matrix is ​​smaller than the magnetic permeability of the magnetic core column.

[0030] In one embodiment of the present application, the magnetic permeability μ1∈[25, 45] of the magnetic core column, and the magnetic permeability μ2∈[15, 45] of the magnetic matrix.

[0031] In one embodiment of the present application, the magnetic substrate is coated with a coating, and the color space value of the coating in the Lab color mode is between (0, -10, -5) and (54, 0, 0).

[0032] In a second aspect, the present application further provides a circuit board, comprising the above-mentioned inductor structure and a circuit substrate, wherein the inductor structure is arranged on the circuit substrate.

[0033] In a third aspect, the present application also provides an electronic device comprising the above-mentioned circuit board. Beneficial effects

[0034] An embodiment of the present application provides an inductor structure, a circuit board, and an electronic device. The inductor structure includes a magnetic core column and a wire. The magnetic core column includes a first part, a second part, and a third part arranged in sequence along a first direction perpendicular to the length direction of the magnetic core column, the first part has a first side wall facing away from the second part, and the third part has a second side wall facing away from the second part; the wire is wound around the magnetic core column and is used to be electrically connected to the circuit board; on the one hand, the present application arranges the first side wall and / or the second side wall to be arranged in a curved shape, and the curved structure is conducive to reducing the space occupied by the magnetic core column, and thus can increase the number of turns of the wire absorbed within a limited packaging space, thereby improving the inductance of the inductor structure; on the other hand, it also limits the length-to-width ratio range of the first cross section of the second part. Compared with the structure with a square cross section, the second part can form a larger cross-sectional area, thereby increasing the inductance of the inductor structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or exemplary technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0036] FIG1 is a schematic structural diagram of an inductor structure provided in one embodiment of the present application;

[0037] FIG2 is a schematic structural diagram of a magnetic core column provided in one embodiment of the present application;

[0038] FIG3 is a schematic diagram of a cross-sectional structure taken along line AA of FIG2 according to an embodiment of the present application;

[0039] FIG4 is a schematic structural diagram of an inductor structure provided in another embodiment of the present application.

[0040] Explanation of specific element symbols: 100-magnetic core column, 110-first part, 111-first side wall, 112-second cross section, 120-second part, 121-first cross section, 130-third part, 131-second side wall, 132-third cross section, 200-wire, 210-first end, 220-second end, 300-base, 310-first surface, 320-side, 330-second surface, 400-magnetic base. Modes for Carrying Out the Invention

[0041] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit this application.

[0042] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The terms "upper", "lower", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of description and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "first" and "second" are only used for the purpose of convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0043] It's important to note that inductors, as crucial components in electronic circuits, often play key roles in energy storage, filtering, and tuning. Chip inductors, as surface-mount high-power inductors, are widely used in various electronic devices due to their miniaturization, high quality, high energy storage, and low resistance. Inductance is a core parameter of an inductor and directly impacts its performance.

[0044] The inductance of an inductor structure will directly affect the performance of electronic equipment. For example, if the inductance of the inductor structure in a transformer does not meet the preset requirements, the output voltage of the transformer will become low, which will cause the electronic equipment to malfunction.

[0045] Based on this, the embodiments of the present application provide an inductor structure, a circuit board and an electronic device with a large inductance. In order to illustrate the technical solution provided by the present application, the following is a detailed description with reference to specific drawings and embodiments.

[0046] Please refer to Figures 1 to 3. Figure 1 shows a schematic diagram of the inductor structure provided by this embodiment; Figure 2 shows a schematic diagram of the structure of the magnetic core 100 provided by this embodiment; and Figure 3 shows a schematic diagram of the cross-sectional structure taken along the AA line of Figure 2 provided by this embodiment. This embodiment provides an inductor structure comprising a magnetic core 100 and a conductor 200. It should be noted that when current is applied to the conductor 200, it can cooperate with the magnetic core 100 to form an inductor.

[0047] The magnetic core 100 includes a first portion 110, a second portion 120, and a third portion 130 arranged in sequence along a first direction, wherein the first direction is perpendicular to the length of the magnetic core 100. It is understood that the length of the magnetic core 100 is the vertical direction of the magnetic core 100. In some embodiments, the first portion 110, the second portion 120, and the third portion 130 are integrally formed.

[0048] The wire 200 is wound around the magnetic core 100 and is used to electrically connect to the circuit board. In other words, the wire 200 is wound around to form a coil structure, and the coil structure is sleeved on the magnetic core 100 to form an inductor.

[0049] The first portion 110 has a first sidewall 111 facing away from the second portion 120, and the third portion 130 has a second sidewall 131 facing away from the second portion 120. It is understood that the first sidewall 111 and the second sidewall 131 are the sidewalls at the left and right ends of the magnetic core 100. The first sidewall 111 and / or the second sidewall 131 are arranged in a curved shape. Compared to a rectangular structure, a curved structure can achieve a higher inductance in the inductor structure while occupying the same space.

[0050] The second portion 120 has a first cross-section 121 perpendicular to its length. The first cross-section 121 is rectangular. The length and width of the first cross-section 121 satisfy the following conditions: H / M∈(1.2, 1.8), where H is the length of the first cross-section 121 in mm, and M is the width of the first cross-section 121 in mm. It is understood that, compared to a square structure, the rectangular structure of the first cross-section 121 enables the second portion 120 to have a greater inductance.

[0051] The magnetic core 100 in current inductor structures is mostly cylindrical. This makes it difficult for inductors with such structures to achieve high inductance, especially when the inductor package size is small. However, in the present application, on the one hand, the first sidewall 111 and / or the second sidewall 131 are arranged in a curved shape. This curved structure helps reduce the space occupied by the magnetic core 100, thereby increasing the number of turns of the wire 200 within the limited packaging space, thereby improving the inductance of the inductor structure. On the other hand, the length-to-width ratio range of the first cross-section 121 of the second portion 120 is also limited. Compared with a structure with a square cross-section, the second portion 120 can form a larger cross-sectional area, thereby increasing the inductance of the inductor structure.

[0052] It should be explained that the inductance of the inductor structure in this application meets the following conditions:

[0053] Where L is the inductance of the inductor structure, mu is the magnetic permeability of the core 100, N is the number of turns of the conductor 200 wound around the core 100, Ae is the cross-sectional area of ​​the core 100, and le is the magnetic path length. As can be seen from the above formula, the inductance is positively correlated with the magnetic permeability, the number of coil turns, and the cross-sectional area of ​​the core. However, due to the physical space limitations of component size, the contributions of the number of coil turns and the cross-sectional area of ​​the core to the inductance inevitably compete with each other.

[0054] Specifically, when the structure of the magnetic core leg 100 is changed, the cross-sectional area of ​​the magnetic core leg 100 and the number of turns of the wire 200 wound around the magnetic core leg 100 may also change. In an exemplary embodiment, the cross-sectional area of ​​the first magnetic core leg is a square structure with a side length of 2r, and the cross-sectional area of ​​the second magnetic core leg is a circular structure with a radius of r. The cross-sectional area of ​​the first magnetic core leg is Ae1=4r 2 ; The cross-sectional area of ​​the second magnetic core column is Ae2=πr 2 ; Ae1>Ae2. When the length of the wire 200 is 1, the number of turns of the wire 200 in the first magnetic core column is N1=1 / 8r, and the number of turns of the wire 200 in the second magnetic core column is N2=1 / 2πr. In the first magnetic column, Ae1×N1=4r 2 ×1 / 8r=r / 2. In the second core leg, Ae2×N2=πr 2 ×1 / 2πr=r / 2.

[0055] Therefore, it can be concluded that when the cross-section is a square structure and a circular structure, and the side length of the square is equal to the diameter of the circular structure, the parameters affecting the inductance are the same. However, in this case, the magnetic core column 100 with a circular cross-section can occupy a smaller space, which is conducive to increasing the number of turns by increasing the length of the wire 200 to increase the inductance of the inductor structure, or reducing the package size of the inductor structure. In other words, when the area of ​​the square structure and the circular structure is the same, the inductor structure formed by the magnetic core column 100 with a circular cross-section can have a higher inductance.

[0056] In another exemplary embodiment, the cross-section of the third magnetic core leg is a circular structure with a radius of r, and the cross-section of the fourth magnetic core leg is a rectangular structure with a width of 2r and a length of nr, where n is any non-zero positive number. As can be seen from the above embodiment, in the third magnetic core leg, Ae3×N3=r / 2. The cross-sectional area of ​​the fourth magnetic core leg is Ae4=2rs, the number of turns of the wire 200 of the fourth magnetic core leg is N1=1 / (4r+2nr), and Ae4×N4=2nr. 2 ×1 / (4r+2nr)=nr / (n+2); As can be seen from the above, when n>2, Ae4×N4>Ae3×N3, that is, the inductance of the inductor structure formed by the fourth magnetic core leg is greater; when 0<n<2, Ae4×N4<Ae3×N3, that is, the inductance of the inductor structure formed by the third magnetic core leg is greater. In other words, the first cross section 121 of the second portion of the present application is a rectangular structure, which is conducive to increasing the inductance of the inductor structure.

[0057] In some embodiments, the inductor structure of this embodiment is a small-sized chip power inductor that can be used as a miniature, integrated inductor for chip integration. This inductor structure offers unique advantages such as small size, high current, low loss, low DC impedance, and strong electromagnetic interference resistance, and can be directly integrated with the chip package.

[0058] In one embodiment of the present application, referring to FIG. 3 , the length and width of the first cross-section 121 of this embodiment satisfy the following conditions: H ∈ (1.8, 2.7); M ∈ (1, 2.2). In some embodiments, the length of the first cross-section 121 is 2.5 and the width is 2.0. In another embodiment, the length of the first cross-section 121 is 2.0 and the width is 1.6. In yet another embodiment, the length of the first cross-section 121 is 2.0 and the width is 1.2.

[0059] In one embodiment of the present application, referring to FIG. 3 , the first portion 110 of this embodiment has a second cross-section 112 perpendicular to its length, and the third portion 130 has a third cross-section 132 perpendicular to its length. The second cross-section 112 and / or the third cross-section 132 are semi-elliptical. It should be noted that the semi-elliptical shape can be half of a full elliptical structure, one-third of the full elliptical structure, or other proportions. It is understood that the semi-elliptical second cross-section 112 or third cross-section 132 can increase the inductance of the inductor structure compared to a square structure.

[0060] In one embodiment of the present application, please continue to refer to Figure 3, the major axis length and minor axis length of the second cross section 112 satisfy the following conditions: a1 / b1∈(1.3, 2.5); a1 is the major axis length of the second cross section 112, in mm; b1 is the minor axis length of the second cross section 112, in mm.

[0061] And / or, the major axis length and minor axis length of the third cross section 132 satisfy the following conditions: a2 / b2∈(1.3, 2.5); a2 is the major axis length of the third cross section 132, in mm; b2 is the minor axis length of the third cross section 132, in mm.

[0062] In one embodiment of the present application, please continue to refer to Figure 3. The major axis length and minor axis length of the second cross-section 112 of this embodiment meet the following conditions: a1∈(0.9, 1.3); b1∈(0.4, 0.8); In one possible example, the length of the major axis of the second cross-section 112 is 1.1, and the length of the minor axis is 0.7. In another possible embodiment, the length of the major axis of the second cross-section 112 is 0.94, and the length of the minor axis is 0.66. In yet another possible embodiment, the length of the major axis of the second cross-section 112 is 1.0, and the length of the minor axis is 0.7. In yet another possible embodiment, the length of the major axis of the second cross-section 112 is 1.2, and the length of the minor axis is 0.5.

[0063] In one specific embodiment, the length of the first cross-section 121 is 2.5 and the width is 2.0, the length of the major axis of the second cross-section 112 is 1.1, and the length of the minor axis is 0.7. In another specific embodiment, the length of the first cross-section 121 is 2.0 and the width is 1.6, the length of the major axis of the second cross-section 112 is 0.94, and the length of the minor axis is 0.66. In yet another specific embodiment, the length of the first cross-section 121 is 2.0 and the width is 1.6, the length of the major axis of the second cross-section 112 is 0.94, and the length of the minor axis is 0.66. In yet another specific embodiment, the length of the first cross-section 121 is 2.0 and the width is 1.2, the length of the major axis of the second cross-section 112 is 1.2, and the length of the minor axis is 0.5.

[0064] And / or, the major axis length and minor axis length of the third cross section 132 satisfy the following conditions: a2∈(0.9, 1.3); b2∈(0.4, 0.8). In one possible example, the length of the major axis of the third cross section 132 is 1.1, and the length of the minor axis is 0.7. In another possible embodiment, the length of the major axis of the third cross section 132 is 0.94, and the length of the minor axis is 0.66. In yet another possible embodiment, the length of the major axis of the third cross section 132 is 1.0, and the length of the minor axis is 0.7. In yet another possible embodiment, the length of the major axis of the third cross section 132 is 1.2, and the length of the minor axis is 0.5.

[0065] In one specific embodiment, the length of the first cross-section 121 is 2.5 and the width is 2.0, the length of the major axis of the third cross-section 132 is 1.1, and the length of the minor axis is 0.7. In another specific embodiment, the length of the first cross-section 121 is 2.0 and the width is 1.6, the length of the major axis of the third cross-section 132 is 0.94, and the length of the minor axis is 0.66. In yet another specific embodiment, the length of the first cross-section 121 is 2.0 and the width is 1.6, the length of the major axis of the third cross-section 132 is 0.94, and the length of the minor axis is 0.66. In yet another specific embodiment, the length of the first cross-section 121 is 2.0 and the width is 1.2, the length of the major axis of the third cross-section 132 is 1.2, and the length of the minor axis is 0.5.

[0066] In one embodiment of the present application, referring to FIG3 , the first portion 110 and the third portion 130 of this embodiment have the same structure and are symmetrical about the center point of the second portion 120. In other words, the second cross section 112 and the third cross section 132 have the same structure and are symmetrically arranged.

[0067] In one embodiment of the present application, referring to Figure 3 , the first portion 110, the second portion 120, and the third portion 130 of this embodiment are an integrally formed structure. It should be noted that the magnetic column is usually formed by pressing magnetic powder.

[0068] In one embodiment of the present application, please continue to refer to 1. The inductor structure of this embodiment includes a base 300, which has a first surface 310 and a second surface 330 that are separated from each other. It is understood that the first surface 310 is the upper surface, and the second surface 330 is the lower surface. The magnetic core 100 is disposed on the first surface 310, and the wire 200 is disposed on the magnetic core 100, with at least one end of the wire 200 extending to the second surface 330. In other words, the middle portion of the wire 200 is wound around the magnetic column, and at least one end of the wire 200 can extend to the lower surface. This allows the wire 200 to be directly soldered to the circuit board without adding any additional metal conductive structure, which helps improve the stability of the overall structure. Furthermore, the first end 210 and / or the second end 220 of the wire 200 are used as pins for connection to the circuit board, which helps avoid risks such as cold solder joints, open circuits, vibration cracking, and even breakage.

[0069] In one embodiment of the present application, referring again to FIG. 1 , a wire 200 includes a first end 210 and a second end 220 disposed opposite each other. Both the first end 210 and the second end 220 extend to the second surface 330 and are used for soldering to the circuit board. In other words, both ends of the wire 200 extend to the lower surface and are simultaneously connected to the circuit board.

[0070] In one embodiment of the present application, please continue to refer to Figure 1. The base 300 of this embodiment has multiple side portions 320 connected to the first surface 310 and the second surface 330, and the first end portion 210 and the second end portion 220 extend to the second surface 330 along the same any one of the side portions 320.

[0071] It should be noted that if the first end 210 and the second end 220 extend to the second surface 330 along different sides 320, a large rotational shear stress would be generated on the first end 210 and the second end 220, which could cause the first end 210 and / or the second end 220 to break, or cause the wire 200 to rotate. However, in this embodiment, the first end 210 and the second end 220 extend to the second surface 330 along the same side 320, which helps reduce the rotational shear stress on the first end 210 and the second end 220, thereby reducing the risk of the first end 210 and / or the second end 220 breaking, and also helps reduce the risk of the wire 200 rotating.

[0072] In one embodiment of the present application, referring to FIG1 , the conductor 200 is a flat conductor 200 having a flat side surface, which is attached to the magnetic core 100. It should be noted that the flat conductor 200 has higher space utilization and effectively reduces the direct current resistance (DCR), thereby improving the product's temperature rise and saturation characteristics.

[0073] In one embodiment of the present application, please refer to FIG4 , which shows a schematic structural diagram of the inductor structure provided by this embodiment. The inductor structure of this embodiment also includes a magnetic matrix 400, which fills and covers the magnetic core column 100 and the wire 200. It should be explained that the magnetic matrix 400 is mainly composed of magnetic powder and a resin binder, and its magnetic properties are mainly determined by the intrinsic characteristic parameters of the magnetic powder such as magnetic permeability, saturation, and bias, as well as process parameters such as filling amount and molding pressure. In the inductor structure, the magnetic core column 100 and the magnetic matrix 400 form a complete magnetic body, which is used to constrain the magnetic circuit and focus energy.

[0074] The magnetic permeability of the magnetic matrix 400 is different from that of the magnetic core 100. It should be noted that magnetic matrices 400 and magnetic cores of varying magnetic permeabilities can be used to reduce costs while maintaining magnetic performance. Specifically, the magnetic permeability of the resulting structure can be adjusted by varying the composition and grade of the magnetic powder, or by varying the ratio of the magnetic powder to the resin binder.

[0075] In one embodiment of the present application, the magnetic permeability of the magnetic substrate 400 is lower than that of the magnetic core 100. It should be noted that in an inductor structure, the magnetic core 100 primarily serves to confine the magnetic field. Therefore, the magnetic core 100 can be made of a more expensive magnetic powder with better magnetic properties. Alternatively, the ratio of magnetic powder to resin binder in the magnetic core 100 can be increased.

[0076] In one embodiment of the present application, the magnetic permeability μ1∈[25, 45] of the magnetic core 100 of this embodiment, and the magnetic permeability μ2∈[15, 45] of the magnetic matrix. In some embodiments, the magnetic powder of the magnetic core 100 and / or the magnetic matrix 400 is a Fe-Si-Cr-B composite system.

[0077] In one embodiment of the present application, the magnetic substrate 400 of this embodiment is coated with a coating, and the color space value of the Lab color mode of the coating is between (0, -10, -5) and (54, 0, 0).

[0078] It's important to explain that the Lab color model is an internationally accepted color model consisting of three elements: lightness (L), and two color channels, a and b. Lightness (L) ranges from 0 to 100, expressing the lightness or darkness of a color. The a channel ranges from dark green (low lightness) to gray (medium lightness) to bright pink (high lightness). The b channel ranges from bright blue (low lightness) to gray (medium lightness) to yellow (high lightness). Mixing these colors produces a vibrant color.

[0079] It can be understood that the Lab color space values ​​used in this embodiment can significantly improve the accuracy of appearance inspection and the efficiency of automatic inductor orientation adjustment using optical sorting methods by precisely controlling the color values ​​of the inductor surface coating. However, using a coating with conventional color space values ​​may cause reflections, making it difficult for the photosensitive device to accurately identify the inductor.

[0080] Specifically, in order to better implement the inductor structure in any of the above embodiments, based on the inductor structure in any of the above embodiments, this embodiment also provides a circuit board, including the inductor structure in any of the above embodiments and a circuit substrate, and the inductor structure is arranged on the circuit substrate.

[0081] More specifically, in order to better implement the circuit board in any of the above embodiments, based on the circuit board in any of the above embodiments, this embodiment further provides an electronic device including the above circuit board.

[0082] In some embodiments, the inductor structure in this embodiment can be applied to industries with high reliability requirements such as automotive, military, medical, aerospace, personal computers and other handheld electronic devices, as well as industrial control motherboards, graphics cards, tablet computers, laptops, new energy vehicle on-board equipment, distribution power systems, modern mobile communication equipment, medical equipment and other fields.

[0083] The above are merely optional embodiments of the present application and are not intended to limit the present application. Those skilled in the art will appreciate that various modifications and variations are possible in the present application. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application are intended to be within the scope of the claims of the present application.

Claims

1. An inductor structure, characterized in that: The inductor structure comprises: A magnetic core column (100), the magnetic core column (100) comprising a first part (110), a second part (120), and a third part (130) arranged in sequence along a first direction, the first direction being perpendicular to a length direction of the magnetic core column (100); A conductor (200), the conductor (200) being wound around the magnetic core column (100) and used for being electrically connected to a circuit board; The first part (110) has a first side wall (111) facing away from the second part (120), and the third part (130) has a second side wall (131) facing away from the second part (120); the first side wall (111) and / or the second side wall (131) are arranged in a curved shape; The second portion (120) has a first cross section (121) perpendicular to the length direction, the first cross section (121) is rectangular; and the length and width of the first cross section (121) satisfy the following conditions: H / M∈(1.2, 1.8); H is the length of the first cross section (121), in mm; M is the width of the first cross section (121), in mm.

2. The inductor structure according to claim 1, characterized in that: The length and width of the first cross section (121) satisfy the following conditions: H∈(1.8, 2.7); M∈(1, 2.2).

3. The inductor structure according to claim 2, characterized in that: The first portion (110) has a second cross section (112) perpendicular to the length direction, and the third portion (130) has a third cross section (132) perpendicular to the length direction; the second cross section (112) and / or the third cross section (132) are semi-elliptical.

4. The inductor structure according to claim 3, characterized in that: The major axis length and the minor axis length of the second cross section (112) satisfy the following conditions: a1 / b1∈(1.3, 2.5); a1 is the length of the major axis of the second cross section (112), in mm; b1 is the minor axis length of the second cross section (112), in mm; And / or, the major axis length and the minor axis length of the third cross section (132) satisfy the following conditions: a2 / b2∈(1.3, 2.5); a2 is the length of the major axis of the third cross section (132), in mm; b2 is the length of the minor axis of the third cross section (132), in mm.

5. The inductor structure according to claim 4, characterized in that: The major axis length and the minor axis length of the second cross section (112) satisfy the following conditions: a1∈(0.9, 1.3); b1∈(0.4, 0.8); And / or, the major axis length and the minor axis length of the third cross section (132) satisfy the following conditions: a2∈(0.9, 1.3); b2∈(0.4, 0.8).

6. The inductor structure according to any one of claims 1 to 5, characterized in that: The first part (110) and the third part (130) have the same structure and are symmetrical with respect to the center point of the second part (120).

7. The inductor structure according to claim 6, characterized in that: The first part (110), the second part (120) and the third part (130) are an integrally formed structure.

8. The inductor structure according to claim 1, characterized in that: The inductor structure comprises a base (300), wherein the base (300) has a first surface (310) and a second surface (330) which are opposite to each other; The magnetic core column (100) is arranged on the first surface (310), the conductive wire (200) is arranged on the magnetic core column (100), and at least one end of the conductive wire (200) extends to the second surface (330).

9. The inductor structure according to claim 8, characterized in that: The conductive wire (200) has a first end (210) and a second end (220) that are arranged opposite to each other, and the first end (210) and the second end (220) both extend to the second surface (330) and are used for welding connection with a circuit board.

10. The inductor structure according to claim 9, characterized in that: The base (300) has a plurality of side portions (320) connected to the first surface (310) and the second surface (330), and the first end portion (210) and the second end portion (220) extend to the second surface (330) along the same any one of the side portions (320).

11. The inductor structure according to any one of claims 8 to 10, characterized in that: The conductor (200) is a flat conductor (200), and the flat conductor (200) has a flat side surface, and the flat side surface is attached to the magnetic core column (100).

12. The inductor structure according to claim 1, characterized in that: The inductor structure further comprises a magnetic matrix (400), wherein the magnetic matrix (400) fills and covers the magnetic core column (100) and the conductive wire (200); Wherein, the magnetic permeability of the magnetic matrix (400) is different from the magnetic permeability of the magnetic core column (100).

13. The inductor structure according to claim 12, characterized in that: The magnetic permeability of the magnetic matrix (400) is smaller than the magnetic permeability of the magnetic core column (100).

14. The inductor structure according to claim 13, characterized in that: The magnetic permeability μ1∈【25, 45】of the magnetic core column (100), and the magnetic permeability μ2∈【15, 45】of the magnetic matrix (400).

15. The inductor structure according to any one of claims 12 to 14, characterized in that: The magnetic substrate (400) is coated with a coating, and the color space value of the coating in the Lab color mode is between (0, -10, -5) and (54, 0, 0).

16. A circuit board, characterized in that: The invention comprises the inductor structure according to claims 1 to 15 and a circuit substrate, wherein the inductor structure is arranged on the circuit substrate.

17. An electronic device, characterized in that: Includes the circuit board as claimed in claim 16.

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