Inductor element

Abstract

The invention provides an inductance element. The inductance element comprises a magnet, a coil and an end electrode, the coil is provided with two parallel linear parts and two opposite arc-shaped parts along the circumferential direction of the coil; at least one through hole conductor is close to the connecting position of one linear part and one arc-shaped part, the center position of the through hole conductor is located on the side, away from the center axis of the coil, of the center line in the width direction of the inner conductor layer, and the outer edge of the through hole conductor does not exceed the first plane and the second plane. The first plane is a plane where the outer edge of the straight line portion close to the through hole conductor is located, and the second plane is perpendicular to the first plane and tangent to the outer peripheral wall of the arc portion close to the through hole conductor. According to the inductance element, the effective inductance area can be increased under the condition that the inductance element is not affected by technological conditions of factors such as deviation, the inductance value and the Q value can be further improved on the existing basis, and meanwhile product scrapping caused by exposure of the through hole conductor is avoided.

Description

Technical Field

[0001] The present invention relates to the field of power devices, in particular to an inductor element. Background Art

[0002] An important factor that usually measures the loss of an inductor is the Q value of the inductor, which is mainly defined as the ratio of the energy stored in the inductor to the energy consumed by the inductor in one signal cycle. The lower the loss, the higher the Q value of the inductor, and the closer the performance of the inductor is to an ideal lossless inductor, thus the better the selectivity in the resonant circuit.

[0003] In order to solve the problems of opening holes, printing, and stacking deviation, common multilayer chip inductors usually add a circular or elliptical design that is slightly larger than the electrode line width at the beginning and end of the electrode pattern. This is usually called a through-hole conductor. This is to improve the reliability of the through-hole conductor's conduction between different layers when problems such as deviation occur. Due to the need to increase the inductance, the residual distance between the outer edge of the electrode and the magnet is usually set to the limit of the current process capability. Therefore, the through-hole conductor usually encroaches on the inside of the coil, thereby reducing the effective area of ​​the inductor, resulting in a decrease in the L value of the inductor and a decrease in the Q value. In addition, some existing through-hole conductors are not properly positioned. When they exceed the outer contour of the coil, it is easy to cause the through-hole conductor to be exposed when the magnet is cut, resulting in the scrapping of the product. Summary of the invention

[0004] The purpose of the present invention is to provide an inductor element, which can increase the effective area of ​​the inductor without being affected by process conditions such as offset factors, further improve the inductance value and Q value on the existing basis, and avoid exposing the through-hole conductor and causing the product to be scrapped.

[0005] To achieve the above-mentioned purpose, the present invention provides an inductor element, including a magnet, a coil and an end electrode; the coil is buried in the magnet, the end electrode is exposed to the magnet and electrically connected to the coil, the coil includes a plurality of internal conductor layers arranged along the axial direction of the coil and connected in series, and two adjacent internal conductor layers are electrically connected through a through-hole conductor; along the circumference of the coil, the coil has two parallel straight portions and two oppositely arranged arc portions; each through-hole conductor is divided into a first through-hole conductor group and a second through-hole conductor group, the first through-hole conductor group and the second through-hole conductor group are respectively located on the two arc portions and are arranged diagonally; at least one through-hole conductor is close to the connection between one of the straight portions and one of the arc portions, the center position of the through-hole conductor is located on the side of the center line of the internal conductor layer in the width direction away from the center axis of the coil, and the outer edge of the through-hole conductor does not exceed the first plane and the second plane, the first plane is the plane where the outer edge of the straight portion close to the through-hole conductor is located, and the second plane is perpendicular to the first plane and tangent to the outer peripheral wall of the arc portion close to the through-hole conductor.

[0006] It can be seen from the above scheme that by setting the through-hole conductor at the position where the arc portion and the straight portion are connected, the through-hole conductor can be offset to the outside as much as possible, and the corner position outside the arc portion can be used, so that the inductor element can achieve an increase in the effective area of ​​the inductor without being affected by the process conditions such as deviation factors, and the inductance value and Q value can be further improved on the existing basis. At the same time, since the outermost edges of the through-hole conductor do not exceed the plane where the outer edge of the straight portion is located and do not exceed the plane tangent to the arc portion, the through-hole conductor is exposed when the magnet is cut, causing the product to be scrapped.

[0007] A preferred solution is that the distance between the two straight portions is equal to the inner diameter of the arc-shaped portion.

[0008] It can be seen from this that the arc-shaped portion can be a semicircular ring.

[0009] A further solution is that, in the extension direction of the straight portion, the distance between the center of the arc portion and the third plane is less than or equal to the distance between the center of the arc portion and the second plane, the third plane is parallel to the second plane and tangent to the through-hole conductor, and the tangent point of the third plane and the through-hole conductor is the point on the through-hole conductor closest to the second plane.

[0010] It can be seen that the distance between the center of the arc portion and the third plane is less than or equal to the distance between the center of the arc portion and the second plane, so as to ensure that the outermost edge of the through-hole conductor does not exceed the plane tangent to the arc portion.

[0011] A further solution is that, in the arrangement direction of the two straight portions, the distance between the center of the arc portion and the fourth plane is less than or equal to the distance between the center of the arc portion and the first plane, the fourth plane is parallel to the first plane and tangent to the through-hole conductor, and the tangent point of the fourth plane and the through-hole conductor is the point on the through-hole conductor closest to the first plane.

[0012] It can be seen that the distance between the center of the arc portion and the fourth plane is less than or equal to the distance between the center of the arc portion and the first plane, so as to ensure that the outermost edge of the through-hole conductor does not exceed the plane where the outer edge of the straight portion is located.

[0013] A preferred solution is that the through-hole conductor is tangent to the inner peripheral wall of the arc-shaped portion.

[0014] It can be seen that this can minimize the area occupied by the through-hole conductor into the inner side of the coil, thereby maximizing the effective area of ​​the inductor.

[0015] A preferred solution is that the cross section of the through-hole conductor is circular, elliptical or racetrack-shaped.

[0016] It can be seen that the shape of the through-hole conductor can be circular, elliptical or racetrack-shaped, etc. By reasonably setting the area of ​​the through-hole conductor, the connection stability of the two adjacent internal conductor layers can be ensured while reducing the area occupied by the through-hole conductor inside the coil.

[0017] A preferred solution is that, in the radial direction of the arc-shaped portion, at least a portion of a projection of the through-hole conductor along the axial direction of the coil is located radially outside a projection of the inner conductor layer along the axial direction of the coil.

[0018] It can be seen from this that by shifting the position of the through-hole conductor to the outside of the coil, it is possible to ensure that the area of ​​the through-hole conductor encroaching on the inside of the coil is reduced while not reducing the area of ​​the through-hole conductor, thereby increasing the effective area of ​​the inductance and preventing the inductance from decreasing.

[0019] A preferred solution is that each inner conductor layer includes a straight segment and an arc segment; the inner conductor layers of two adjacent layers are arranged in a racetrack shape; the straight segments form a straight portion, and the arc segments form an arc portion.

[0020] It can be seen that by designing the internal conductor layer into connected straight line segments and arc segments, the internal conductor layers of two adjacent layers are arranged in a racetrack shape. In this way, since the two adjacent coils are not directly opposite to each other, the distributed capacitance between the coils of each layer is relatively small, so a higher Q value can be obtained.

[0021] A preferred solution is that the through-hole conductors in the first through-hole conductor group are coaxially arranged and their projections along the axial direction of the coil overlap.

[0022] It can be seen from this that it can be ensured that each through-hole conductor in the first through-hole conductor group is offset toward the outside of the coil.

[0023] A preferred solution is that the through-hole conductors in the second through-hole conductor group are coaxially arranged and their projections along the axial direction of the coil overlap.

[0024] It can be seen from this that it can be ensured that each through-hole conductor in the second through-hole conductor group is offset toward the outside of the coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 1 is a top view of an embodiment of an inductor element of the present invention.

[0026] Figure 2 yes Figure 1 A partial enlarged view of point D in the middle.

[0027] Figure 3 Schematic diagram of the structure of the coil in the embodiment of the inductor element of the present invention.

[0028] Figure 4 It is a schematic structural diagram of one of two adjacent internal conductor layers in an embodiment of the inductor element of the present invention.

[0029] Figure 5 It is a schematic structural diagram of the other one of the two adjacent inner conductor layers in the embodiment of the inductor element of the present invention.

[0030] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0031] See also Figure 1 and 2 The inductor element of this embodiment is a laminated chip inductor, and the inductor element includes a magnet 1, a coil 2 and an end electrode (not shown). The magnet 1 is in the shape of a rectangular parallelepiped and is made of insulating material. The coil 2 is buried in the magnet 1. The material of the coil 2 can be silver, copper and its alloy material. There are two end electrodes, both of which are exposed to the magnet 1 and electrically connected to the coil 2.

[0032] The coil 2 includes a plurality of internal conductor layers 3 arranged along the axial direction of the coil 2 and connected in series, and two adjacent internal conductor layers 3 are electrically connected via a through-hole conductor 4. Optionally, the cross section of the through-hole conductor 4 is circular.

[0033] Along the circumference of the coil 2 , the coil 2 has two parallel straight portions 21 and two oppositely disposed arc portions 22 , and the distance between the two straight portions 21 is equal to the inner diameter of the arc portion 22 .

[0034] Each through-hole conductor 4 is divided into a first through-hole conductor group 5 and a second through-hole conductor group 6. The first through-hole conductor group 5 and the second through-hole conductor group 6 are respectively located on two arc-shaped portions 22 and are arranged diagonally symmetrically. The through-hole conductors 4 in the first through-hole conductor group 5 are arranged coaxially and their projections along the axial direction of the coil 2 coincide. The through-hole conductors 4 in the second through-hole conductor group 6 are arranged coaxially and their projections along the axial direction of the coil 2 coincide.

[0035] The first through-hole conductor group 5 is close to the connection between one of the straight portions 21 and one of the arcuate portions 22 , and the second through-hole conductor group 6 is close to the connection between the other straight portion 21 and the other arcuate portion 22 .

[0036] like Figures 1 to 5 As shown, each inner conductor layer 3 includes a straight segment 31 and an arc segment 32. Two adjacent inner conductor layers 3 form a racetrack shape. Each straight segment 31 forms a straight portion 21, and each arc segment 32 forms an arc portion 22.

[0037] In the radial direction of the arc-shaped portion 22, at least a portion of the projection of the through-hole conductor 4 along the axial direction of the coil 2 is as follows: Figure 2The area indicated by the arrow A is located radially outside the projection of the inner conductor layer 3 along the axial direction of the coil 2. The center position B of each through-hole conductor 4 is located on the side of the center line L in the width direction of the inner conductor layer 3 away from the center axis of the coil 2, and the outer edge of each through-hole conductor 4 does not exceed the corresponding first plane P1 and second plane P2, as shown in FIG. Figure 3 As shown, the first plane P1 corresponding to the through-hole conductor 4 in the second through-hole conductor group 6 is a plane where the outer edge 211 of the straight portion 21 close to the through-hole conductor 4 is located, that is, Figure 3 The plane where the outer edge 211 of the straight portion 21 on the lower middle side is located is the second plane P2 corresponding to the through-hole conductor 4 in the second through-hole conductor group 6, which is perpendicular to the first plane P1 and tangent to the outer peripheral wall of the arc-shaped portion 22 close to the corresponding through-hole conductor 4, that is, the second plane P2 is Figure 3 The outer peripheral wall of the arc-shaped portion 22 on the middle right side is tangent.

[0038] In the extension direction of the straight portion 21, the distance L1 between the center C of the arc portion 22 and the third plane P3 is less than or equal to the distance R1 between the center C of the arc portion 22 and the second plane P2, the distance R1 between the center C of the arc portion 22 and the second plane P2 is equal to the radius of the arc portion 22, the third plane P3 is parallel to the second plane P2 and is tangent to the through-hole conductor 4, and the tangent point of the third plane P3 and the through-hole conductor 4 is the point on the through-hole conductor 4 closest to the second plane P2.

[0039] In the arrangement direction of the two straight portions 21, the distance W1 between the center C of the arc portion 22 and the fourth plane P4 is less than or equal to the distance R1 between the center C of the arc portion 22 and the first plane P1, the distance R1 between the center C of the arc portion 22 and the first plane P1 is equal to the radius of the arc portion 22, the fourth plane P4 is parallel to the first plane P1 and tangent to the through-hole conductor 4, and the tangent point of the fourth plane P4 and the through-hole conductor 4 is the point on the through-hole conductor 4 closest to the first plane P1.

[0040] In addition, the through-hole conductor may also be tangent to the inner peripheral wall of the arc-shaped portion. The cross-section of the through-hole conductor may also be elliptical or racetrack-shaped, etc. The shape and size of the cross-section of the through-hole conductor may be changed as needed. The above changes can also achieve the purpose of the present invention.

[0041] Finally, it should be emphasized that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Inductor element, including magnet, coil and end electrodes; The coil is embedded in the magnet, and the end electrode is exposed from the magnet and electrically connected to the coil; The coil comprises a plurality of internal conductor layers arranged along the axial direction of the coil and connected in series, and two adjacent internal conductor layers are electrically connected via a through-hole conductor; Features: Along the circumference of the coil, the coil has two parallel straight portions and two oppositely arranged arc portions; Each through-hole conductor is divided into a first through-hole conductor group and a second through-hole conductor group, wherein the first through-hole conductor group and the second through-hole conductor group are respectively located on the two arc-shaped portions and are arranged diagonally; At least one of the through-hole conductors is close to the connection between one of the straight portions and one of the arc-shaped portions, the center position of the through-hole conductor is located on the side of the center line in the width direction of the internal conductor layer away from the central axis of the coil, and the outer edge of the through-hole conductor does not exceed a first plane and a second plane, the first plane is a plane where the outer edge of the straight portion close to the through-hole conductor is located, and the second plane is perpendicular to the first plane and tangent to the outer peripheral wall of the arc-shaped portion close to the through-hole conductor.

2. The inductor element according to claim 1, characterized in that: The distance between the two straight portions is equal to the inner diameter of the arc portion.

3. The inductor element according to claim 2, characterized in that: In the extension direction of the straight portion, the distance between the center of the arc portion and the third plane is less than or equal to the distance between the center of the arc portion and the second plane, the third plane is parallel to the second plane and tangent to the through-hole conductor, and the tangent point of the third plane and the through-hole conductor is the point on the through-hole conductor closest to the second plane.

4. The inductor element according to claim 2, characterized in that: In the arrangement direction of the two straight portions, the distance between the center of the arc portion and the fourth plane is less than or equal to the distance between the center of the arc portion and the first plane, the fourth plane is parallel to the first plane and tangent to the through-hole conductor, and the tangent point of the fourth plane and the through-hole conductor is the point on the through-hole conductor closest to the first plane.

5. The inductor element according to any one of claims 1 to 4, characterized in that: The through-hole conductor is tangent to an inner peripheral wall of the arc-shaped portion.

6. The inductor element according to any one of claims 1 to 4, characterized in that: The cross section of the through-hole conductor is circular, elliptical or racetrack-shaped.

7. The inductor element according to any one of claims 1 to 4, characterized in that: In the radial direction of the arc-shaped portion, at least a portion of a projection of the through-hole conductor along the axial direction of the coil is located radially outside a projection of the inner conductor layer along the axial direction of the coil.

8. The inductor element according to any one of claims 1 to 4, characterized in that: Each of the inner conductor layers includes a straight segment and an arc segment; The inner conductor layers of two adjacent layers are arranged in a racetrack shape, the straight line segments constitute the straight line portion, and the arc segments constitute the arc portion.

9. The inductor element according to any one of claims 1 to 4, characterized in that: The through-hole conductors in the first through-hole conductor group are coaxially arranged and their projections along the axial direction of the coil overlap.

10. The inductor element according to any one of claims 1 to 4, characterized in that: The through-hole conductors in the second through-hole conductor group are coaxially arranged and their projections along the axial direction of the coil overlap.

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