Inductor element
By arranging the through-hole conductors toward the outside in the inductor component to form a racetrack-shaped structure, the problems of reduced effective inductor area and lowered Q value are solved, the inductance value and Q value are improved, and at the same time, product losses caused by exposed through-hole conductors are avoided.
Patent Information
- Application Number
- CN202422506304.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-16
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-10-16
AI Technical Summary
Under the influence of factors such as process deviation, the existing multilayer chip inductors have reduced effective inductor area, lowered Q value, and easily exposed through-hole conductors, resulting in product scrapping.
The through-hole conductor of the inductor component is designed to be located at the connection between the arc part and the straight part, and arranged toward the outside to form a racetrack-shaped structure, ensuring that the through-hole conductor does not exceed the outer edge, thereby increasing the effective area and improving the inductance value and Q value.
Without being affected by process deviation, the effective area of the inductor is increased, the inductance value and Q value are improved, and product scrapping caused by exposed through-hole conductors is avoided.
Smart Images
Figure CN223362917U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of power devices, in particular to an inductor element. Background Art
[0002] An important factor in measuring inductor losses is the inductor's Q value, which is defined as the ratio of the energy stored in the inductor to the energy consumed during a signal cycle. The lower the losses, the higher the inductor's Q value, and the closer the inductor's performance is to an ideal lossless inductor, resulting in better selectivity in resonant circuits.
[0003] To address issues like hole opening, printing, and stacking misalignment, common multilayer chip inductors typically add a circular or elliptical design slightly larger than the electrode line width at the beginning and end of the electrode pattern. This is commonly referred to as a through-hole conductor. This improves the reliability of the through-hole conductor's conduction between different layers when misalignment and other issues arise. Due to the need to increase inductance, the residual distance between the outer edge of the electrode and the magnet is typically set to the limit of current process capabilities. Therefore, the through-hole conductor typically encroaches into the interior of the coil, reducing the effective area of the inductor, resulting in a decrease in the inductor's L value and a lower Q value. Furthermore, some existing through-hole conductors are improperly positioned. When they exceed the outer contour of the coil, they can easily become exposed when the magnet is cut, resulting in the scrapping of the product. Utility Model Content
[0004] The purpose of the utility model is to provide an inductor component that 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 the exposure of the through-hole conductor that causes the product to be scrapped.
[0005] To achieve the above-mentioned objectives, the present invention provides an inductor element, comprising 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 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; 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 located near 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 central 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 near 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 near 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 utilized, so that the inductor element can achieve an increase in the effective area of the inductor without being affected by 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] In a preferred solution, 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. 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 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 toward 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 inductor 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 form 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 layers into connected straight 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 each other, the distributed capacitance between the coils of each layer is relatively small, and thus a higher Q value can be obtained.
[0021] In a preferred embodiment, 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] This shows that it is possible to ensure that each through-hole conductor in the first through-hole conductor group is offset toward the outside of the coil.
[0023] In a preferred embodiment, 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] This shows that it is possible to ensure 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 It is a top view of an embodiment of the 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 It is a structural diagram of the coil in the embodiment of the inductor element of the utility model.
[0028] Figure 4It is a structural schematic diagram of one of the two adjacent internal conductor layers in the embodiment of the inductor element of the present invention.
[0029] Figure 5 It is a structural schematic diagram of the other of the two adjacent inner conductor layers in the embodiment of the inductor element of the present invention.
[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION
[0031] See also Figure 1 and 2 The inductor component of this embodiment is a multilayer chip inductor, comprising a magnet 1, a coil 2, and end electrodes (not shown). The magnet 1 is a rectangular parallelepiped made of insulating material. The coil 2 is embedded within the magnet 1 and can be made of silver, copper, or alloys thereof. There are two end electrodes, both exposed on the magnet 1 and electrically connected to the coil 2.
[0032] The coil 2 includes a plurality of inner conductor layers 3 arranged along the axial direction of the coil 2 and connected in series, and two adjacent inner 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 arcuate portions 22 . The distance between the two straight portions 21 is equal to the inner diameter of the arcuate portion 22 .
[0034] The through-hole conductors 4 are 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 the 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 overlap. 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 overlap.
[0035] The first through-hole conductor group 5 is located near a connection between one of the straight portions 21 and one of the arcuate portions 22 , and the second through-hole conductor group 6 is located near a 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. The straight segments 31 form the straight portion 21, and the arc segments 32 form the arc portion 22.
[0037] In the radial direction of the arc portion 22, at least a portion of the projection of the through-hole conductor 4 along the axial direction of the coil 2 is formed. 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 central 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. Figure 3 As shown, the first plane P1 corresponding to the through-hole conductor 4 in the second through-hole conductor group 6 is the 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 perpendicular to the first plane P1. 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-shaped portion 22 and the third plane P3 is less than or equal to the distance R1 between the center C of the arc-shaped portion 22 and the second plane P2. The distance R1 between the center C of the arc-shaped portion 22 and the second plane P2 is equal to the radius of the arc-shaped portion 22. The third plane P3 is parallel to the second plane P2 and tangent to the through-hole conductor 4. The point of tangency between 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-shaped portion 22 and the fourth plane P4 is less than or equal to the distance R1 between the center C of the arc-shaped portion 22 and the first plane P1. The distance R1 between the center C of the arc-shaped portion 22 and the first plane P1 is equal to the radius of the arc-shaped portion 22. The fourth plane P4 is parallel to the first plane P1 and tangent to the through-hole conductor 4. The point of tangency between 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] Furthermore, the through-hole conductor may be tangent to the inner circumferential wall of the arc-shaped portion. The cross-section of the through-hole conductor may also be elliptical or racetrack-shaped. The shape and size of the through-hole conductor's cross-section may be modified as needed. Such modifications 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 includes a plurality of inner conductor layers arranged along the axial direction of the coil and connected in series, and two adjacent inner conductor layers are electrically connected via a through-hole conductor; Its characteristics are: 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 located near the connection between one of the straight portions and one of the curved portions, and the center position of the through-hole conductor is located on the side of the center line of the inner conductor layer in the width direction away from the central 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 curved portion close to the through-hole conductor.
2. The inductor element according to claim 1, wherein: 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, wherein: 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, wherein: In the arrangement direction of the two straight portions, a distance between the center of the arc portion and a fourth plane is less than or equal to a 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 a point of tangency between the fourth plane and the through-hole conductor is a 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 the 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 a radial direction of the arc 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 inner conductor layer includes a straight segment and an arc segment; The inner conductor layers of two adjacent layers form a racetrack shape, the straight segments constitute the straight 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.