Transformer device

The present application claims priority to Taiwan Application Serial Number 109120713, filed Jun. 19, 2020, which is incorporated herein by reference in its entirety.

The present disclosure relates to an electronic device. More particularly, the present disclosure relates to a transformer device.

In existing technology, the stacked or spiral inductors can be designed with different winding methods according to different application requirements. However, different winding methods have their corresponding advantages and disadvantages. For example, the wires in the same coil of the spiral structure will have higher mutual inductance value, but cause a problem of higher parasitic capacitance correspondingly. Therefore, it is important to achieve balance among inductance, quality factor, parasitic capacitance and other related factors.

In order to solve the problem mentioned above, the present disclosure provides a transformer device including a first coil and a second coil. The first coil includes a number of first circles. The second coil includes a number of second circles. A first side of a first one of the first coil is adjacent to one of the first coil, and a second side of the first one of the first coil is adjacent to one of the second coil. A first side and a second side of a second one of the first coil are adjacent to one of the second coil, respectively.

It is to be understood that both the foregoing general description and the following detailed description are by examples, and are intended to provide further explanation of the invention as claimed.

The present disclosure can be more fully understood by reading the following detailed description of the embodiment, with reference made to the accompanying drawings as follows:

FIG. 1 is a schematic diagram illustrating a transformer device, in accordance with some embodiments of the present disclosure;

FIG. 2 is a schematic diagram illustrating a partial structure of the transformer device shown in FIG. 1 , in accordance with some embodiments of the present disclosure;

FIG. 3 is a schematic diagram illustrating a partial structure of the transformer device shown in FIG. 1 , in accordance with some embodiments of the present disclosure; and

FIG. 4 is a schematic diagram illustrating experimental data of the transformer device, in accordance with some embodiments of the present disclosure.

Reference will now be made in detail to the present embodiments of the disclosure, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.

It will be understood that, although the terms first, second, third etc. may be used herein to describe various elements, components and/or sections, these elements, components and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component or section from another element, component or section. Thus, a first element, component or section discussed below could be termed a second element, component or section without departing from the teachings of the present disclosure.

The terms herein are used for describing particular embodiments and are not intended to be limited thereto. Single forms such as “a,” “this,” “the,” as used herein also include the plurality form.

In the description herein and throughout the claims that follow, the terms “coupled” or “connected” in this document may be used to indicate that two or more elements physically or electrically contact with each other, directly or indirectly. They may also be used to indicate that two or more elements cooperate or interact with each other.

In the description herein and throughout the claims that follow, the terms “comprise,” or “comprising,” “include,” or “including,” “have,” or “having,” “contain,” or “containing,” and the like used herein are to be understood to be open-ended, i.e., to mean including but not limited to.

In the description herein and throughout the claims that follow, the phrase “and/or” includes any and all combinations of one or more of the associated listed claims.

In the description herein and throughout the claims that follow, unless otherwise defined, all terms have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Reference is now made to FIG. 1 . FIG. 1 is a schematic diagram illustrating a transformer device 1000 in accordance with some embodiments of the present disclosure.

For ease of understanding, a transformer device 1000 shown in FIG. 1 can be separated into a first coil 1100 of the transformer device 1000 shown in FIG. 2 and a second coil 1200 of the transformer device 1000 shown in FIG. 3 . The first coil 1100 includes first wires 1111 ˜ 1120 , and the second coil 1200 includes second wires 1211 ˜ 1213 . In some embodiments, the second wire 1211 is overlapped on the first wire 1112 , the second wire 1212 is overlapped on the first wire 1114 , and the second wire 1213 is overlapped on the first wire 1117 .

In some embodiments, the second wire 1211 and the second wire 1212 are located at two sides of the first wire 1113 respectively, the first wire 1115 is located at one side of the first wire 1116 , and the second wire 1213 is located at the other side of the first wire 1116 . In other words, a part of the first wire(s) of the first coil 1100 have both sides adjacent to the second wire of the second coil 1200 , and the other part of the first wire(s) of the first coil 1100 have one side adjacent to the first wire and the other side adjacent to the second wire.

In some embodiments, from the top view of the cross section line X shown in FIG. 1 , the transformer device 1000 includes the first wire 1111 , the second wire 1211 , the first wire 1113 , the second wire 1212 , the first wire 1115 , the first wire 1116 , the second wire 1213 , the first wire 1118 , the first wire 1119 , and the first wire 1120 , disposed from outside to inside. Structures and connections of the first coil 1100 and the second coil 1200 of the transformer device 1000 will be described in more details in the follow paragraphs.

References are now made to FIG. 1 , FIG. 2 and FIG. 3 . FIG. 2 is a schematic diagram illustrating a first coil 1100 of the transformer device 1000 shown in FIG. 1 , in accordance with some embodiments of the present disclosure. FIG. 3 is a schematic diagram illustrating a second coil 1200 of the transformer device 1000 shown in FIG. 1 , in accordance with some embodiments of the present disclosure.

In some embodiments, the first wires of the first coil 1100 are disposed on the first metal layer, and the second wires of the second coil 1200 are disposed on the second metal layer, in which the first wire and the second wire can be coupled by a vertical connector (e.g., via). For example, via(s) V 1 shown in FIG. 3 are configured to couple the first wire 1111 to the second wire 1211 . The patterns same as via(s) V 1 shown in figure are configured to represent vertical connectors, which is configured to couple the first wires and the second wires disposed on different metal layers. For simplicity of illustration, it will not be described repeatedly in the present disclosure. It is noted that, the amount and the position of the vertical connectors are not limited to those shown in the figure.

In some embodiments, a first side S 1 is at the upper side of the transformer device 1000 , and a second side is at the lower side of the transformer device 1000 , in which the first side S 1 is in parallel with the second side S 2 . In some embodiments, a third side S 3 is at the left side of the transformer device 1000 , and a fourth side S 4 is at the right side of the transformer device 1000 , in which the third side S 3 is in parallel with the fourth side S 4 , and the first side S 1 and the second side S 2 are substantially perpendicular to the third side S 3 and the fourth side S 4 .

In some embodiments, the first side S 1 of the transformer device 1000 includes an opening 1221 between the second wire 1220 and the second wire 1222 . In some embodiments, the first side S 1 of the transformer device 1000 includes a first connector C 1 and a second connector C 2 disposed on the second metal layer. The first connector C 1 is a Z-shaped structure with right angle, and is configured to go through the opening 1221 to connect an opening OE 1 between the partial first wire C 11 and the partial first wire C 12 , and to cross the first wire 1131 , and crosses the first wire 1131 which is in vertical direction. The second connector C 2 is a Z-shaped structure with right angle, and is configured to connect an opening OE 2 between the partial first wire C 21 and the partial first wire C 22 . The second connector C 2 crosses the first wire 1132 and the first wire 1133 disposed vertically.

In some embodiments, the second wire 1230 turns in a Z-shape on the first side S 1 , and crosses the first wire 1140 .

In some embodiments, the transformer device 1000 further includes a first input/output terminal 1171 disposed on the first side S 1 , which is formed by extension of the outermost first wire on the first side S 1 .

In some embodiments, the second side S 2 of the transformer device 1000 includes a third connector C 3 , a fourth connector C 4 and a fifth connector C 5 disposed on the second metal layer. The third connector C 3 is a Z-shaped structure, and is configured to connect an opening OE 3 between a partial first wire C 31 and a partial first wire C 32 . The third connector C 3 crosses the first wire 1134 , and forms a X-shaped structure with the first wire 1134 . The fourth connector C 4 is a Z-shaped structure, and is configured to connect an opening OE 4 between a partial first wire C 41 and a partial first wire C 42 . Also, the fourth connector C 4 crosses the first wire 1135 , and form an X-shaped structure with the first wire 1135 . The fifth connector C 5 is a Z-shaped structure with right angle, and is configured to connect an opening OE 5 between a partial first wire C 51 and a partial first wire C 52 , and the fifth connector C 5 crosses the first wire 1136 and the first wire 1137 disposed vertically.

In some embodiments, the second wire 1240 turns in a Z-shape on the second side S 2 , and crosses the first wire 1150 .

In some embodiments, the partial first wire C 51 , the partial first wire C 31 and the first wire C 71 are crossed by the second wire 1251 and the second wire 1252 , to connect two terminals of the first wire located at innermost side.

In some embodiments, the transformer device 1000 further includes a second input/output terminal 1172 disposed on the second side S 2 , which is formed by extension of the outermost first wire on the second side S 1 .

In some embodiments, the third side S 3 of the transformer device 1000 includes the partial first wire I 11 interlaced with the partial second wire I 21 , and the partial first wire I 12 interlaced with the partial second wire I 22 . In this way, the interlacing area of the first coil 1100 and the second coil 1200 on the first side S 1 and the second side S 2 can be reduced (e.g., the first wire 1150 is the only one crossed by the second wire 1240 on the second side S 2 ). For example, in some embodiments, when the partial first wire I 12 is not interlaced with the partial second wire I 22 on the third side S 3 (not shown in figure), the first wire 1150 and the first wire 1160 are crossed by the second wire 1240 in the second side S 2 .

In some embodiments, the fourth side S 4 of the transformer device 1000 includes a partial first wire I 13 interlaced with a partial second wire I 23 . In some embodiments, the fourth side S 4 of the transformer device 1000 further includes a partial first wire I 14 interlaced with a partial second wire I 24 . When the transformer device 1000 includes the partial first wire I 11 interlaced with the partial second wire I 21 on the third side S 3 , and includes the partial first wire I 12 of the first wire interlaced with the partial second wire I 22 on the third side S 3 , the third side S 3 of the transformer device 1000 is symmetrical to the fourth side S 4 of the transformer device 1000 , and the interlacing area of the first coil 1100 and the second coil 1200 on the first side S 1 and the second side S 2 are reduced correspondingly, such that the resistance of the transformer device 1000 can be reduced and the quality factor of the transformer device 1000 can be increased.

FIG. 4 is a schematic diagram illustrating experimental data of the transformer device 1000 shown in FIG. 1 , in accordance with some embodiments of the present disclosure. As shown in FIG. 4 , quality factor of the experimental curves of the coils of the conventional transformer device without structural configuration according to the present disclosure are m1 and m2, and the experimental curves of the first coil and the second coil of the transformer device 1000 with the structural configuration according to the present disclosure are m3 and m4. As shown in FIG. 4 , the quality factor of the transformer device 1000 has higher quality factor at a frequency of 2.4 GHz and a frequency of 5 GHz. Therefore, it can be seen that the transformer device 1000 with the structural configuration according to the present disclosure has better quality.

In sum, with interlacing, crossing and overlapping of the first wires and the second wires, the transformer device in the present disclosure has better structural symmetry and quality factor (Q).

Although the present disclosure has been described in considerable detail with reference to certain embodiments thereof, other embodiments are possible. Therefore, the spirit and scope of the appended claims should not be limited to the description of the embodiments contained herein.

It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present disclosure without departing from the scope or spirit of the disclosure. In view of the foregoing, it is intended that the present disclosure cover modifications and variations of this disclosure provided they fall within the scope of the following claims.