CN109390134B

CN109390134B - Inductance device

Info

Publication number: CN109390134B
Application number: CN201710659636.0A
Authority: CN
Inventors: 颜孝璁; 刘智华
Original assignee: Realtek Semiconductor Corp
Current assignee: Realtek Semiconductor Corp
Priority date: 2017-08-04
Filing date: 2017-08-04
Publication date: 2021-03-30
Anticipated expiration: 2037-08-04
Also published as: CN109390134A

Abstract

An inductor device includes at least two coils and at least two switches. Each of the at least two coils includes an opening and corresponds to each other. One of the at least two switches is coupled to both ends of the opening of one of the at least two coils, and the other of the at least two switches is alternately coupled to one end of the opening of one of the at least two coils and one end of the opening of the other of the at least two coils. If one of the at least two switches is turned on, one of the at least two coils forms an inductor; if the other of the at least two switches is turned on, the at least two coils form an inductor together.

Description

Inductance device

Technical Field

The present disclosure relates to a basic electronic device, and more particularly, to an inductive device.

Background

Various types of conventional inductors have advantages and disadvantages, such as a spiral-type inductor, which has a high Q value and a large mutual inductance value, and both the mutual inductance value and the coupling occur between coils. Therefore, the application range of both is limited.

Disclosure of Invention

One aspect of the present disclosure relates to an inductive device, which includes at least two coils and at least two switches. Each of the at least two coils includes an opening and corresponds to each other. One of the at least two switches is coupled to two ends of the opening of one of the at least two coils, and the other of the at least two switches is coupled to one end of the opening of one of the at least two coils and one end of the opening of the other of the at least two coils in a staggered manner. If one of the at least two switches is conducted, one of the at least two coils forms an inductor; if the other of the at least two switches is conducted, the at least two coils together form an inductor.

Another aspect of the present disclosure relates to an inductive device, which includes a plurality of coils, a first switch and a second switch. Each of at least two of the coils includes an opening and corresponds to each other. The first switch is coupled to two ends of the opening of one of the at least two coils. The second switch is coupled to one end of the opening of one of the at least two coils and one end of the opening of the other of the at least two coils in an interlaced manner. If the first switch is conducted, part of the coils form an inductor; if the second switch is conducted, the coils together form an inductor.

Therefore, according to the technical content of the present disclosure, an inductance device is provided in the embodiments of the present disclosure to provide different inductance values, so as to expand the application range of the inductance device.

Drawings

Fig. 1 is a schematic diagram illustrating an inductive device according to an embodiment of the present disclosure.

Fig. 2 is a schematic circuit diagram illustrating a portion of the inductive device shown in fig. 1 according to an embodiment of the disclosure.

Fig. 3 is a schematic diagram illustrating an inductive device according to an embodiment of the present disclosure.

Fig. 4 is a schematic circuit diagram illustrating a portion of the inductive device shown in fig. 3 according to an embodiment of the present disclosure.

Fig. 5 is a partial circuit schematic diagram illustrating an inductive device according to an embodiment of the present disclosure.

Fig. 6 is a schematic circuit diagram illustrating a portion of an inductive device according to an embodiment of the present disclosure.

Fig. 7 is a schematic diagram illustrating an inductive device according to an embodiment of the present disclosure.

Fig. 8 is a partial circuit schematic diagram of an inductive device shown in fig. 7 according to an embodiment of the present disclosure.

Fig. 9 is a graph illustrating experimental data of an inductive device according to an embodiment of the present disclosure.

[ notation ] to show

100: inductance device

110. 120, 130, 140, 150, 160, 510, 520, 530, 540, 550, 560: coil

111. 121, 125, 131, 135, 141, 145, 151, 155, 161, 511, 515, 521, 525, 531, 535, 541, 545, 551, 561, 565: opening of the container

132. 133, 142, 143, 532, 533, 534, 536, 542, 543, 544, 546, 552, 553, 561, 562, 566, 567: endpoint

170. 170A, 570: local circuit

180. 180A, 580: input terminal

190. 590: center point

500: inductance device

501-506: connection point

572. 574, 576: connecting piece

Detailed Description

Fig. 1 is a schematic diagram illustrating an inductive device 100 according to an embodiment of the present disclosure. Fig. 2 is an enlarged schematic diagram illustrating a portion of a circuit 170 of the inductive device shown in fig. 1 according to an embodiment of the disclosure. Referring to fig. 1 and 2 together, in one implementation aspect, the inductive device 100 includes at least two coils (e.g., coils 130 and 140) and at least two switches (e.g., switches SW1 and SW 2). At least two coils (e.g., coils 130, 140) each include an opening (e.g., openings 131, 141) and correspond to each other (e.g.,

openings

131, 141 are disposed on the upper side of the inductive device 100 and are adjacent to each other). One of the at least two switches (e.g., switch SW1) is coupled to two ends of the opening of one of the at least two coils (e.g., two

ends

132, 133 of the opening 131 of the coil 130), and the other of the at least two switches (e.g., switch SW2) is alternately coupled to one end of the opening of one of the at least two coils (e.g., one end 132 of the opening 131 of the coil 130) and one end of the opening of the other of the at least two coils (e.g., one end 143 of the opening 141 of the coil 140).

In some embodiments, at least two coils may be coils of different layers. In some embodiments, one of the at least two coils may correspond up and down with another of the at least two coils.

If one of the at least two switches (e.g., switch SW1) is turned on, one of the at least two coils (e.g., coil 130) forms an inductor; if the other of the at least two switches (e.g., switch SW2) is turned on, then at least two of the coils (e.g., coils 130, 140), and even all of the coils (e.g., coils 110-160) in FIG. 1, together form an inductor.

In one embodiment, the other end (e.g., the other end 133 of the opening 131) of one of the at least two coils (e.g., the coil 130) is coupled to one end (e.g., the other end 142 of the opening 141) of the other of the at least two coils (e.g., the coil 140).

In another aspect, inductive device 100 includes

coils

110, 120, 130, 140, 150, 160, switch SW1, and switch SW 2. The coils 110 to 160 include

openings

111, 121, 131, 141, 151, and 161, respectively. In one embodiment, the switches SW1 and SW2 can be implemented by, but not limited to, Bipolar Junction Transistors (BJTs), Metal-Oxide-Semiconductor Field-Effect transistors (MOSFETs), and the like. In one embodiment, when one of the switches SW1 and SW2 is implemented by a transistor, the transistor receives a control voltage (e.g., a control voltage received by a gate or a base), wherein the control voltage is used to control the equivalent resistance of the switches SW1 and SW2 when turned on, so as to adjust the current flowing through the inductor 100, thereby enabling the inductor 100 to have different inductance values.

In the structural configuration, the switch SW1 is coupled to the two

ends

132 and 133 of the opening 131 of the coil 130, and the switch SW2 is coupled to one end 132 of the opening 131 of the coil 130 and one end 143 of the opening 141 of the coil 140 in an interleaved manner. In detail, the opening 131 includes an open end 132 and an open end 133, and the opening 141 includes an open end 142 and an open end 143. The switch SW1 is coupled to the open end 132 and the open end 133 of the opening 131, and the switch SW2 is coupled to the open end 132 and the open end 143 of the

opening

131 and 141. In one embodiment, the open end 132 of the opening 131 is located on the same side (left side in the figure) as the open end 142 of the opening 141, and the open end 133 of the opening 131 is located on the same side (right side in the figure) as the open end 143 of the opening 141.

If the switch SW1 is turned on, some of the coils 110-160 form an inductor, for example, when the switch SW1 is turned on, the two

ends

132, 133 of the opening 131 of the coil 130 are connected through the switch SW1, and then the coils 110-130 form an inductor. On the other hand, when the switch SW2 is turned on, the coils 110 to 160 form an inductor, for example, when the switch SW2 is turned on, the end 132 of the opening 131 of the coil 130 is connected to the end 143 of the opening 141 of the coil 140, and the coils 110 to 160 form an inductor.

In one embodiment, the inductive device 100 further includes an input terminal 180. The input terminal 180 is disposed on a first side (e.g., a lower side) of the inductor 100 based on a center point 190 of the inductor 100, and the openings 111-161 are disposed on a second side (e.g., an upper side) of the inductor 100 opposite to the first side.

In another embodiment, the input terminal 180 is disposed at the coil 110 for connecting with other devices. The openings 111 of the coil 110 are alternately coupled with the openings 121 of the coil 120, and the open ends 133 of the openings 131 of the coil 110 are coupled with the open ends 142 of the openings 141 of the coil 140. In addition, the openings 151 of the coil 150 are cross-coupled with the openings 161 of the coil 160.

In another embodiment, the coils 120-150 further include

openings

125, 135, 145, 155, respectively, and the openings 125-155 are disposed on a first side (e.g., a lower side) of the inductor device 100. The openings 125 of the coil 120 are cross-coupled with the openings 135 of the coil 130, and the openings 145 of the coil 140 are cross-coupled with the openings 155 of the coil 150.

When the switch SW1 is turned on, the two ends 132 and 133 of the opening 131 of the coil 130 are connected via the switch SW1, and the structure of the inductor is as follows: "enter the coil 110 from the left end of the input terminal 180 and wind the coil 120 alternately to the second side (top side in the figure) of the inductive device 100, then wind the first side (bottom side in the figure) of the inductive device 100 alternately to the coil 130, and then wind the second side of the inductive device 100, so that one end 132 of the opening 131 of the coil 130 is coupled to the other end 133 thereof through the switch SW 1. Then, the winding is continued to the first side of the inductive device 100 along the coil 130, then the winding is interleaved with the coil 120, then the winding is continued to the second side of the inductive device 100, and the winding is interleaved with the coil 110, and finally the winding is wound out from the right end of the input end 180. ' Pai

On the other hand, when the switch SW2 is turned on, the one end 132 of the opening 131 of the coil 130 is connected to the one end 143 of the opening 141 of the coil 140, and the structure of the inductor is as follows: "enter the coil 110 from the left end of the input terminal 180 and wind the second side (the upper side in the figure) of the inductive device 100, then wind the coil 120 alternately, then wind the first side (the lower side in the figure) of the inductive device 100, then wind the coil 130 alternately, and then wind the second side of the inductive device 100, and connect the end 132 of the opening 131 of the coil 130 with the end 143 of the opening 141 of the coil 140 through the switch SW 2. Then, the winding is performed along the coil 140 to the first side of the inductive device 100, then the winding is performed alternately to the coil 150, then the winding is performed alternately to the second side of the inductive device 100, and then the winding is performed alternately to the coil 160. Then, after a full turn based on the center point 190, the coil returns to the second side of the inductance device 100, the coil 150 is wound in an interlaced manner, the coil 140 is wound in an interlaced manner after the coil is wound to the first side of the inductance device 100, the coil 130 is wound in an interlaced manner after the coil is wound to the second side of the inductance device 100, the coil 120 is wound in an interlaced manner after the coil is wound to the first side of the inductance device 100, the coil 110 is wound in an interlaced manner after the coil is wound to the second side of the inductance device 100, and finally the coil is wound out from the right end of the input end 180. ' Pai

Fig. 3 is a schematic diagram illustrating an inductive device 100A according to an embodiment of the present disclosure. Fig. 4 is an enlarged schematic diagram illustrating a part of a circuit 170A of the inductive device 100A shown in fig. 3 according to an embodiment of the present disclosure. It should be noted that the inductive device 100A shown in fig. 3 is substantially similar to the inductive device 100 shown in fig. 1, and the difference between the inductive device 100A shown in fig. 3 and the inductive device 100 shown in fig. 1 lies in the connection manner of the switch SW1, the switch SW2 and the input terminal 180A, which will be described later.

Referring to fig. 3 and 4, in the structural configuration, the switch SW1 is coupled to the two ends 142 and 143 of the opening 141 of the coil 140, and the switch SW2 is coupled to the one end 132 of the opening 131 of the coil 130 and the one end 143 of the opening 141 of the coil 140 in an alternating manner. Specifically, the opening 131 includes an open end 132 and an open end 133, the opening 141 includes an open end 142 and an open end 143, the switch SW1 is coupled to the open end 142 and the open end 143 of the opening 141, and the switch SW2 is coupled to the open end 132 of the opening 131 and the open end 143 of the opening 141. In addition, the input terminal 180A of fig. 3 is disposed at a first side (e.g., a lower side in the figure) of the inductive device 100 and disposed at the coil 160 for connecting with other devices.

If the switch SW1 is turned on, some of the coils 110-160 form an inductor, for example, when the switch SW1 is turned on, the two ends 142, 143 of the opening 141 of the coil 140 are connected through the switch SW1, and at this time, the

coils

140, 150, 160 form an inductor. On the other hand, when the switch SW2 is turned on, the coils 110 to 160 form an inductor, for example, when the switch SW2 is turned on, the end 132 of the opening 131 of the coil 130 is connected to the end 143 of the opening 141 of the coil 140, and the coils 110 to 160 form an inductor.

When the switch SW1 is turned on, the two ends 142, 143 of the opening 141 of the coil 140 are connected via the switch SW1, and the structure of the inductor is as follows: "enter the coil 160 from the left end of the input terminal 180A and wind to the second side (top side in the figure) of the inductive device 100A, then wind to the coil 150 alternately, then wind to the first side (bottom side in the figure) of the inductive device 100A, then wind to the coil 140 alternately, and then wind to the second side of the inductive device 100A, and then couple one end 142 of the opening 141 of the coil 140 to the other end 143 thereof through the switch SW 1. Then, the winding is continued to the first side of the inductive device 100A along the winding 140, then the winding is interleaved with the winding 150, then the winding is continued to the second side of the inductive device 100, and the winding is interleaved with the winding 160, and finally the winding is wound out from the right end of the input end 180A. ' Pai

On the other hand, when the switch SW2 is turned on, the one end 132 of the opening 131 of the coil 130 is connected to the one end 143 of the opening 141 of the coil 140, and the structure of the inductor is as follows: "enter the coil 160 from the left end of the input terminal 180A and wind to the second side (top side in the figure) of the inductive device 100A, then wind to the coil 150 in an interlaced manner, then wind to the first side (bottom side in the figure) of the inductive device 100A, then wind to the coil 140 in an interlaced manner, then wind to the second side of the inductive device 100A, wind to the coil 130 in an interlaced manner, wind to the first side of the inductive device 100A, wind to the coil 120 in an interlaced manner, wind to the second side of the inductive device 100A, and wind to the coil 110 in an interlaced manner. Then, after a full turn based on the center point 190, the coil returns to the second side of the inductance device 100A, the coil 120 is wound in an interlaced manner, the coil 130 is wound in an interlaced manner after the coil is wound to the first side of the inductance device 100A, and the coil 100A is wound to the second side, so that the end 132 of the opening 131 of the coil 130 is connected to the end 143 of the opening 141 of the coil 140 through the switch SW 2. Then, the winding is performed to the first side of the inductive device 100A, and the winding is performed to the coil 150, and then, after the winding is performed to the second side of the inductive device 100A, the winding is performed to the coil 160, and finally, the winding is performed from the right end of the input end 180A. ' Pai

Fig. 5 is a partial circuit diagram illustrating an inductive device 500 according to an embodiment of the present disclosure. Fig. 6 is a partial circuit schematic diagram illustrating an inductive device 500 according to an embodiment of the present disclosure. Fig. 7 is a schematic diagram illustrating an inductive device 500 according to an embodiment of the present disclosure. It should be noted that fig. 5 illustrates a four-turn structure, and fig. 6 illustrates a two-turn structure, which together form the inductive device 500 shown in fig. 7. In addition, fig. 8 is an enlarged schematic diagram of a part of the circuit 570 of the inductive device 500 shown in fig. 7 according to another embodiment of the present disclosure, so as to detail the connection relationship of the inductive device 500.

To facilitate understanding of the inductive device 500 shown in fig. 7, the inductive device 500 is first split into the four-turn structure of fig. 5 and the two-turn structure of fig. 6, which will be described later. Referring to fig. 5, the four-turn structure includes

coils

510, 520, 530, and 540, the coil 510 includes an input end 580, the coils 520 to 540 include

openings

521, 531, and 541, respectively, and the coils 510 to 540 further include

openings

515, 525, 535, and 545, respectively. The input terminal 580 and the openings 521-541 are disposed on a first side (e.g., a lower side) of the inductive device 500, and the openings 515-545 are disposed on a second side (e.g., an upper side) of the inductive device 500, with respect to a center 590 of the inductive device 500.

In addition, the four-turn structure further includes connecting

members

572, 574, 576. The connecting member 572 couples one end of the opening 515 of the coil 510 to one end of the opening 525 of the coil 520, and more particularly, the connecting member 572 couples one end of the opening 515 of the coil 510 via the connection point 501, and the connecting member 572 couples one end of the opening 525 of the coil 520 via the connection point 502, so that one end of the opening 515 is coupled to one end of the opening 525 via the connecting member 572. Similarly, one end of the opening 535 of the coil 530 (at connection point 503) may be coupled to one end of the opening 545 (at connection point 504) by a connection 574. Similarly, one end of the opening 521 of the coil 520 (at the connection point 505) may be coupled to one end of the opening 531 of the coil 530 (at the connection point 506) by a connection 576.

Referring to fig. 8, the inductive device 500 includes a switch SW1, a switch SW1 coupled to the

ends

542 and 543 of the opening 541 of the coil 540. Referring to fig. 5 and 8, when the switch SW1 is turned on, the two ends 542 and 543 of the opening 541 of the coil 540 are connected via the switch SW1, and the structure of the inductor is as follows: after entering the coil 510 from the left end of the input terminal 580 and winding to one side (e.g., the top side) of the inductive device 500, the input terminal is coupled to the coil 520 through the connection 572 (the path is from the connection point 501 to the connection point 502), then winds to the other side (e.g., the bottom side) of the inductive device 500, then alternately winds to the coil 530, then winds to one side of the inductive device 500, couples to the coil 540 through the connection 574 (the path is from the connection point 503 to the connection point 504), winds to the other side of the inductive device 500, and couples the two ends 542 and 543 of the opening 541 of the coil 540 through the switch SW 1. Then, the winding is continued to be wound to one side of the inductive device 500 along the coil 540, then to be alternately wound to the coil 530, and then to be wound to the other side of the inductive device 500, and then to be coupled to the coil 520 through the connection element 576 (the path is from the connection point 506 to the connection point 505), then to be wound to one side of the inductive device 500, and then to be alternately wound to the coil 510, and finally to be wound out from the right end of the input terminal 580. ' Pai

See also fig. 6 and 7. The two-turn structure of fig. 6 includes a coil 550 and a coil 560. Structurally, one end 553 of the opening 551 of the coil 550 is coupled to the other end 525 of the coil 520 (at the connection point 502), and the other end 552 of the opening 551 of the coil 550 is alternatively coupled to one end 563 of the opening 561 of the coil 560. In addition, the other end 562 of the opening 561 of the coil 560 is coupled to the other end (at the connection point 503) of the opening 535 of the coil 530. Furthermore, the opening 565 of the coil 560 is disposed on a first side (lower side in the figure) of the inductive device 500, one end 566 of the opening 565 of the coil 560 is coupled to one end 544 of the opening 541 of the coil 540, and the other end 567 of the opening 565 of the coil 560 is coupled to the other end (at the connection point 506) of the opening of the coil 530.

Referring to fig. 8, the inductive device 500 includes a switch SW2, a switch SW2 coupled to a terminal 543 of the opening 541 of the coil 540 and a terminal 544 of the opening of the coil 560. Referring to fig. 5 to 8, when the switch SW2 is turned on, the terminal 543 of the opening 541 of the coil 540 is connected to the terminal 544 of the opening of the coil 560 through the switch SW2, and at this time, the inductor extends from the coils 510 to 540 of the first layer to the coils 550 to 560 of the second layer through the switch SW2, so that the coils 510 to 560 form an inductor together.

Fig. 9 is a graph illustrating experimental data of an inductive device according to an embodiment of the present disclosure. The experimental data plot illustrates the quality factor (Q) and inductance of the inductive device at different frequencies. As shown in the figure, the curve C1 is a quality factor curve of the conductive state of the switch SW1 of the inductor apparatus, and the curve C2 is a corresponding inductance curve of the conductive state of the switch SW 1. From the experimental data of fig. 9, it can be seen that the quality factor of the inductive device in the on state of the switch SW1 can reach about 11. In addition, the curve C3 is a quality factor curve of the conduction of the switch SW2 of the inductor apparatus, and the curve C4 is a corresponding inductance curve of the conduction state of the switch SW 2. From the experimental data of fig. 9, it can be seen that the quality factor of the inductive device in the on state of the switch SW2 can reach about 14. In addition, as can be seen from fig. 9, the inductance values of the inductive devices in the on state of the switch SW1 and the on state of the switch SW2 are different, and the inductive devices are suitable for systems/devices that need to switch between different frequency bands (e.g. between 2.4GHz and 5 GHz).

Therefore, the inductance value of the inductance device is changed, so that the inductance device is suitable for systems/devices which need to be switched among different frequency bands, and the application range of the inductance device is widened. However, the present disclosure is not limited to the above-mentioned values, and those skilled in the art can adjust the above-mentioned values according to actual requirements to achieve the best performance.

Although specific embodiments of the present disclosure have been described above, it should be understood that they have the ordinary skill in the art and various changes and modifications can be made therein without departing from the spirit and scope of the present disclosure, and therefore the scope of the present disclosure should be determined by the appended claims.

Claims

1. An inductive device, comprising:

at least two coils, wherein each of the at least two coils comprises an opening and corresponds to each other; and

at least two switches, wherein one of the at least two switches is coupled to two ends of the opening of one of the at least two coils, and the other of the at least two switches is coupled to one end of the opening of one of the at least two coils and one end of the opening of the other of the at least two coils, wherein the one end of the opening of one of the at least two coils and the one end of the opening of the other of the at least two coils are staggered and located on two opposite sides;

wherein if one of the at least two switches is conducted, one of the at least two coils forms an inductor; if the other of the at least two switches is conducted, the at least two coils all form the inductor together.

2. The inductive device of claim 1, wherein another end of the opening of one of the at least two coils is coupled to another end of the opening of another of the at least two coils, wherein the at least two coils comprise:

a first coil including a first opening, the first opening including a first end and a second end; and

a second coil including a second opening, the second opening including a first end and a second end, wherein the second end of the first opening of the first coil is coupled to the first end of the second opening of the second coil, and the second end of the first opening of the first coil and the first end of the second opening of the second coil are staggered to each other at opposite sides.

3. The inductive device of claim 2, wherein the at least two switches comprise:

a first switch including a first end and a second end, wherein the first end of the first switch is coupled to the first end of the first opening, and the second end of the first switch is coupled to the second end of the first opening; and

a second switch including a first end and a second end, wherein the first end of the second switch is coupled to the first end of the first opening, and the second end of the second switch is coupled to the second end of the second opening, wherein if the first switch is turned on to turn on the first end of the first switch to turn on the second end, the first coil forms the inductor; if the second switch is turned on to connect the first end of the second switch to the second end, the first coil and the second coil all form the inductor together.

4. The inductive device of claim 1, wherein one of the at least two switches is a transistor, the transistor receiving a control voltage, wherein the control voltage is used to determine an equivalent resistance of the transistor.

5. An inductive device, comprising:

a plurality of coils, wherein each of at least two of the coils comprises an opening and corresponds to each other;

a first switch coupled to two ends of the opening of one of the at least two coils; and

a second switch coupled to one end of the opening of one of the at least two coils and one end of the opening of the other of the at least two coils, wherein the one end of the opening of one of the at least two coils and the one end of the opening of the other of the at least two coils are staggered to each other and located at two opposite sides;

wherein if the first switch is turned on, the one of the coils forms an inductor; if the second switch is turned on, the one and the other form the inductor together.

6. The inductive device of claim 5, further comprising an input end, wherein the coils comprise a first coil, a second coil, a third coil, a fourth coil, a fifth coil, and a sixth coil, the first through sixth coils comprise a first through sixth openings, respectively, wherein the input end is disposed on a first side of the inductive device and the first through sixth openings are disposed on a second side of the inductive device opposite to the first side, based on the center point of the inductive device.

7. The inductive device of claim 6, wherein the input terminal is disposed at the first coil, wherein one end of the first opening of the first coil is coupled with one end of the second opening of the second coil and is positioned at the two sides in a mutually staggered manner, the other end of the first opening of the first coil is coupled with the other end of the second opening of the second coil and is positioned at the two sides in a mutually staggered way, one end of the fifth opening of the fifth coil is coupled with one end of the sixth opening of the sixth coil and is positioned at the opposite sides in a mutually staggered manner, the other end of the fifth opening of the fifth coil is coupled with the other end of the sixth opening of the sixth coil and is positioned at the opposite sides in a mutually staggered manner, the first switch is coupled to two ends of the third opening of the third coil, and the second switch is coupled to one end of the fourth opening of the fourth coil and one end of the third opening of the third coil.

8. The inductance device according to claim 6, wherein the input terminal is located at the sixth coil, wherein one end of the first opening of the first coil is coupled to one end of the second opening of the second coil and is staggered from each other on the opposite sides, the other end of the first opening of the first coil is coupled to the other end of the second opening of the second coil and is staggered from each other on the two sides, one end of the fifth opening of the fifth coil is coupled to one end of the sixth opening of the sixth coil and is staggered from each other on the opposite sides, the other end of the fifth opening of the fifth coil is coupled to the other end of the sixth opening of the sixth coil and is staggered from each other on the opposite sides, wherein the third opening comprises a first end and a second end, and the fourth opening comprises a first end and a second end, the first switch is coupled to the first end and the second end of the fourth opening, and the second switch is coupled to the first end of the third opening and the second end of the fourth opening.

9. The inductive device of claim 6, wherein the first through fourth windings are located in a first layer, the fifth and sixth windings are located in a second layer, the first and second layers being located in different layers, wherein if the first switch is turned on, the first through fourth windings all together form an inductor; if the second switch is turned on, the first coil to the sixth coil all form the inductor together.

10. The inductance device of claim 9, further comprising a first connection element and a second connection element, wherein the input terminal is disposed on the first coil, wherein one end of the first opening of the first coil is coupled to one end of the second opening of the second coil and is staggered on the two opposite sides, the other end of the first opening of the first coil is coupled to the other end of the second opening of the second coil through the first connection element, one end of the third opening of the third coil is coupled to one end of the fourth opening of the fourth coil and is staggered on the two opposite sides, and the other end of the third opening of the third coil is coupled to the other end of the fourth opening of the fourth coil through the second connection element and is staggered on the two opposite sides.