TWI462126B - Spiral inductor structure - Google Patents

Description

Spiral inductor structure

The present invention relates to inductive structures, and more particularly to helical inductive structures.

Inductors are an important component of RF circuits. At present, many handheld wireless devices (such as smart phones, tablets, etc.) use a large number of inductive components, and the quality factor (Q value) is an important parameter of the inductor. Taking wireless charging technology as an example, the Q value has a great influence on the transmission efficiency and transmission distance. In addition, when the inductor is applied to impedance matching, it is necessary to ensure that the inductor has a certain Q value to reduce the loss on the path. Therefore, how to improve the Q value of the inductor is an urgent problem to be solved.

An embodiment of the present invention provides a spiral inductor structure, including: a coil composed of a line segment having a plurality of enlarged portions and a plurality of connecting portions spaced apart from each other, wherein a line width of each enlarged portion is greater than that of each connecting portion The line width, the coil includes: an outer ring; and a first inner ring, the first inner ring is coplanar with the outer ring, the outer ring is connected to the first inner ring and surrounds the first inner ring, wherein the enlarged portion of the outer ring Adjacent to the connecting portion located at the first inner ring, and the connecting portion at the outer ring is adjacent to the enlarged portion located at the first inner ring.

The manner of making and using the embodiments of the present invention will be described in detail below. It should be noted, however, that the present invention provides many inventive concepts that can be applied in various specific forms. The specific embodiments discussed herein are merely illustrative of specific ways of making and using the invention, and are not intended to limit the scope of the invention. Moreover, repeated numbers or labels may be used in different embodiments. These repetitions are merely for the purpose of simplicity and clarity of the invention and are not to be construed as a limitation of the various embodiments and/or structures discussed. Furthermore, when a first material layer is referred to or on a second material layer, the first material layer is in direct contact with or separated from the second material layer by one or more other material layers. In the drawings, the shape or thickness of the embodiments may be enlarged to simplify or highlight the features. Furthermore, elements not shown or described in the figures may be in any form known to those of ordinary skill in the art.

1 is a top view of a spiral inductor structure in accordance with an embodiment of the present invention. Referring to FIG. 1 , the spiral inductor structure 10 of the present embodiment includes a coil 100. The coil 100 is composed of a line segment having a plurality of enlarged portions 110a, 110b, 110c and a plurality of connecting portions 120a spaced from each other. 120b, 120c. Specifically, each of the connecting portions 120a, 120b, and 120c is connected between the adjacent enlarged portions 110a, 110b, and 110c, and the enlarged portions 110a, 110b, and 110c are arranged in series.

The line width W1 of each of the enlarged portions 110a, 110b, and 110c is larger than the line width W2 of each of the connecting portions 120a, 120b, and 120c. In one embodiment, the ratio of the line width W1 of each of the enlarged portions 110a, 110b, and 110c to the line width W2 of each of the connecting portions 120a, 120b, and 120c is greater than 1 and less than 5. In one embodiment, the ratio of the line width W1 of each of the enlarged portions 110a, 110b, and 110c to the line width W2 of each of the connecting portions 120a, 120b, and 120c is greater than 1 and less than 1.5.

The coil 100 includes an outer ring 130 and a first inner ring 140. The outer ring 130 is coplanar with the first inner ring 140, wherein the outer ring 130 is coupled to the first inner ring 140 and surrounds the first inner ring 140. The enlarged portion 110a located at the outer ring 130 is adjacent to the connecting portion 120b at the first inner ring 140, and the connecting portion 120a at the outer ring 130 is adjacent to the enlarged portion 110b at the first inner ring 140.

In an embodiment, the coil 100 may further include a second inner ring 150, the second inner ring 150 is coplanar with the first inner ring 140, and the first inner ring 140 is connected to the second inner ring 150 and surrounds the second inner ring. 150. The connecting portion 120b located at the first inner ring 140 is sandwiched (or interposed) between the enlarged portion 110a of the outer ring 130 and the enlarged portion 110c of the second inner ring 150, and is located at an enlarged portion of the first inner ring 140. The 110b is sandwiched between the connecting portion 120a of the outer ring 130 and the connecting portion 120c of the second inner ring 150. It should be noted that the shape of the coil 100 is not limited to a rectangle having four sides as shown in FIG. 1 , and may be any polygon, circle, or ellipse, etc., and those skilled in the art can change according to requirements. .

The length L1 of the enlarged portion 110a is, for example, about 1/32 to 1/8 of the circumference of the outer ring 130. Taking the rectangular shape having four sides as shown in FIG. 1 as an example, the length L1 of the enlarged portion 110a is, for example, 1/8 to 1/2 of the width W3 of the outer ring 130, and the length L2 of the enlarged portion 110b is, for example, about the first inner ring 140. The width of W4 is 1/8 to 1/2.

In an embodiment, the lengths of the plurality of enlarged portions located on the same circle are substantially equal, and the lengths of the enlarged portions located at different turns are different from each other. For example, as shown in FIG. 1, the lengths L1 of the plurality of enlarged portions 110a located in the outer ring 130 are substantially equal, but different from the length L2 of the enlarged portion 110b of the first inner ring 140 and located within the second The enlarged portion 110c of the circle 150 Length L3. Alternatively, the lengths L2 of the plurality of enlarged portions 110b located in the first inner ring 140 are substantially equal, but different from the lengths L1, L3 of the enlarged portions 110a, 110c. In an embodiment, the length L2 of the enlarged portion 110b of the first inner ring 140 is smaller than the length L1 of the enlarged portion 110a of the outer ring 130. In the present embodiment, the smaller the length of the enlarged portion located in the inner ring, the larger the length of the enlarged portion located in the outer ring.

In an embodiment, the lengths of the plurality of connecting portions located on the same circle are substantially equal, and the lengths of the connecting portions located at different turns are different from each other. For example, as shown in FIG. 1, the lengths A1 of the plurality of connecting portions 120a located in the outer ring 130 are substantially equal, but different from the length A2 of the connecting portion 120b located at the first inner ring 140. Still alternatively, the lengths A2 of the plurality of connecting portions 120b located in the first inner ring 140 are substantially equal, but different from the length A3 of the connecting portion 120c located in the second inner ring 150. In an embodiment, the length A2 of the connecting portion 120b located at the first inner ring 140 is smaller than the length A1 of the plurality of connecting portions 120a located at the outer ring 130. In the present embodiment, the smaller the length of the connecting portion located in the inner ring, the larger the length of the connecting portion located in the outer ring.

The ratio of the length L1 (or L2, L3) of the enlarged portion 110a (or 110b, 110c) to the length A1 (or A2, A3) of the connecting portion 120a (or 120b, 120c) is about 0.1 to 2. In an embodiment, the ratio of the length L1 (or L2, L3) of the enlarged portion 110a (or 110b, 110c) to the length A1 (or A2, A3) of the connecting portion 120a (or 120b, 120c) is about 0.1 to 1 .

It should be noted that although the spiral inductor structure 10 of the embodiment includes only three turns (the outer ring 130, the first inner ring 140, and the second inner ring 150), the present invention is not limited thereto, and the concept of the embodiment can be applied to More circles in the spiral inductor structure.

Further, in another embodiment (as shown in Fig. 2), the lengths L1, L2, L3 of the enlarged portions 110a, 110b, 110c may be selectively equal to each other.

Referring again to FIG. 1, the minimum distance D1 between the enlarged portion 110a of the outer ring 130 and the connecting portion 120b adjacent thereto and located at the first inner ring 140 is, for example, greater than 0 and smaller than the enlarged portion 110a (or 110b, The difference between the line width W1 of 110c) and the line width W2 of the connecting portion 120a (or 120b, 120c). In an embodiment, the minimum spacing D1 is greater than 0 and less than one-half of the difference between the line widths W1 and W2. ,that is .

It is to be noted that since the coil 100 of the present embodiment has a plurality of enlarged portions 110a, 110b, 110c having a large line width, the line width of the partial coil 100 can be increased, thereby reducing the overall resistance and ohmic loss of the coil 100. Further, the present embodiment makes the enlarged portion (for example, 110a) having a larger line width laterally adjacent to the connecting portion (for example, 120b) having a smaller line width (located in an adjacent circle). In this way, an appropriate spacing between the different turns can be maintained to effectively reduce the proximity effect of the coil 100, thereby increasing the Q value of the coil 100.

The minimum distance D2 between the enlarged portion 110a of the outer ring 130 and the enlarged portion 110b of the first inner ring 140 is, for example, greater than 0 and smaller than the line width W1 of the enlarged portion 110a (or 110b, 110c) and the connecting portion 120a (or 120b) , 120c) The difference in line width W2. In one embodiment, the spacing D2 is greater than zero and less than one-half of the difference between the line widths W1, W2.

In one embodiment, the enlarged portions 110a, 110b, 110c and the connecting portions 120a, 120b, 120c are integrally formed. The material of the coil 100 is a conductive material, including a non-magnetic metal, a non-magnetic metal alloy, a magnetic metal, a magnetic metal alloy, a doped polysilicon, a polycrystalline telluride conductive material, and a laminate of the foregoing materials. In an embodiment, the enlarged portion 110a, The shape of 110b, 110c is, for example, a square, a rectangle, an octagon, a circle, or other suitable shape.

In one embodiment, the spiral inductor structure 10 further includes a substrate 200 , and the coil 100 is disposed on the substrate 200 . The substrate 200 is, for example, an insulating substrate or a semiconductor substrate. In detail, the substrate 200 may include a substrate and an insulating layer (not shown) on the substrate, the coil 100 is located on the insulating layer, and one end portion E of the coil 100 extends through the insulating layer to the insulating layer and the substrate. between.

As described above, since the coil of the present invention has a plurality of enlarged portions having a large line width, the overall resistance of the coil and the ohmic loss can be effectively reduced. In addition, since the enlarged portion having a large line width is laterally adjacent to the connecting portion having a small line width (located in an adjacent circle), the present invention can maintain an appropriate spacing between the different circles, thereby effectively reducing the coil. The proximity effect, which in turn increases the Q of the coil.

The present invention has been disclosed in the above preferred embodiments, and is not intended to limit the scope of the present invention. Any one of ordinary skill in the art can make a few changes without departing from the spirit and scope of the invention. The scope of protection of the present invention is therefore defined by the scope of the appended claims.

10‧‧‧Spiral Inductor Structure

100‧‧‧ coil

110a, 110b, 110c‧‧

120a, 120b, 120c‧‧‧ Connections

130‧‧‧Outer ring

140‧‧‧First inner circle

150‧‧‧Second inner circle

200‧‧‧Substrate

A1, A2, A3, L1, L2, L3‧‧‧ length

D1, D2‧‧‧ minimum spacing

E‧‧‧End

W1, W2‧‧‧ line width

W3, W4‧‧‧ width

1 is a top view of a spiral inductor structure in accordance with an embodiment of the present invention.

2 is a top view of a spiral inductor structure according to another embodiment of the present invention.

10‧‧‧Spiral Inductor Structure

100‧‧‧ coil

110a, 110b, 110c‧‧

120a, 120b, 120c‧‧‧ Connections

130‧‧‧Outer ring

140‧‧‧First inner circle

150‧‧‧Second inner circle

200‧‧‧Substrate

A1, A2, A3, L1, L2, L3‧‧‧ length

D1, D2‧‧‧ minimum spacing

E‧‧‧End

W1, W2‧‧‧ line width

W3, W4‧‧‧ width

Claims (13)

A spiral inductor structure comprising: a coil composed of a line segment having a plurality of enlarged portions spaced apart from each other and a plurality of connecting portions, wherein each of the enlarged portions has a line width larger than each of the connecting portions a line width, the coil comprising: an outer ring; and a first inner ring coplanar with the outer ring; wherein the outer ring is connected to the first inner ring and surrounds the first inner ring, wherein the outer ring Each of the enlarged portions is adjacent to each of the connecting portions of the first inner ring, and each of the connecting portions of the outer ring is adjacent to each of the enlarged portions of the first inner ring . The spiral inductor structure of claim 1, wherein the coil further comprises: a second inner ring connected to the second inner ring and surrounding the second inner ring, wherein the first inner ring Each of the connecting portions of the inner ring is respectively between each of the enlarged portions of the outer ring and each of the enlarged portions of the second inner ring, and each of the first inner rings The enlarged portions are respectively located between each of the connecting portions of the outer ring and each of the connecting portions of the second inner ring. The spiral inductor structure of claim 1, wherein a ratio of a line width of each of the enlarged portions to a line width of each of the connecting portions is greater than 1 and less than 5. The spiral inductor structure of claim 1, wherein a spacing between each of the enlarged portions of the outer ring and each of the connecting portions of the first inner ring adjacent thereto is less than each of the Line width and each of these enlarged parts The difference in line width of the connecting portions. The spiral inductor structure of claim 1, wherein a ratio of a length of each of the enlarged portions to a length of each of the connecting portions ranges from about 0.1 to 2. The spiral inductor structure of claim 1, wherein each of the enlarged portions of the outer ring has a length between 1/32 and 1/8 of a circumference of the outer ring. The spiral inductor structure of claim 1, wherein each of the enlarged portions of the first inner ring has a length between 1/32 and 1/8 of a circumference of the first inner ring. The spiral inductor structure of claim 1, wherein the lengths of each of the enlarged portions located on the same circle are substantially equal. The spiral inductor structure of claim 8, wherein each of the enlarged portions of the first inner ring has a length smaller than a length of each of the enlarged portions of the outer ring. The spiral inductor structure of claim 1, wherein the lengths of each of the connecting portions located on the same circle are substantially equal. The spiral inductor structure of claim 10, wherein each of the connecting portions of the first inner ring has a length smaller than a length of each of the connecting portions of the outer ring. The spiral inductor structure of claim 1, further comprising: a substrate, the coil being disposed on the substrate. The spiral inductor structure of claim 12, wherein the substrate comprises an insulating substrate or a semiconductor substrate.