transformer

Abstract

The present invention relates to a transformer, and when a secondary coil includes a plurality of conductive lines, a current concentration phenomenon and a DC resistance deviation of the plurality of conductive lines constituting the secondary coil can be reduced by simply implementing crossing of the secondary coil by using a bus bar on the opposite side of a terminal unit.

Description

Transformers

[0001] The embodiment relates to a transformer.

[0002] The power supply of electronic devices is equipped with various magnetic coupling devices such as transformers and line filters, and coil components, for example.

[0003] Transformers can be incorporated into electronic devices for a variety of purposes. For example, they can be used to perform the energy transfer function, transferring energy from one circuit to another. Transformers can also be used to change the voltage level, either by stepping up or stepping down. Furthermore, transformers, which feature only inductive coupling between the primary and secondary windings and thus no direct DC path, can be used to block DC and pass AC, or to provide insulation between two circuits.

[0004] Figure 1 is an exploded perspective view showing an example of a typical transformer configuration.

[0005] Referring to Fig. 1, a typical slim transformer (10) includes an upper core (11) and a lower core (12), and a secondary coil (13) and a primary coil (14) between the upper core (11) and the lower core (12). The secondary coil (13) is usually composed of a plurality of conductive metal plates, and the primary coil (14) is usually formed by winding a conductive wire. Depending on the configuration, a bobbin (not shown) may be placed between the upper core (11) and the lower core (12).

[0006] In the transformer illustrated in Fig. 1, the primary coil and the secondary coil overlap in the vertical direction. However, if a conductive wire is applied to the secondary coil instead of a conductive metal plate, the primary coil and the secondary coil can be arranged to overlap each other in the horizontal direction.

[0007] However, when applying conductive lines to the secondary coil, they must be arranged side by side on a plane to make it slimmer. Therefore, when forming turns centered on the middle of the core, the inner conductive line closest to the middle becomes the shortest in length, and the outer conductive line farthest from the middle becomes the longest in length, resulting in inductance deviation. This inductance deviation causes current concentration, and this current concentration, in turn, has the problem of causing severe heat generation.

[0008] In order to alleviate the current concentration phenomenon, the winding work of crossing the secondary coil in some areas is done manually, which causes problems in increasing the production time and cost of the parts.

[0009] The embodiment provides a transformer having a simple configuration while alleviating current saturation and reducing DC resistance variation of a plurality of conductive wires forming a secondary coil.

[0010] A transformer according to the present invention is characterized by a configuration including a core portion including a lower core and an upper core arranged in a first direction from the lower core; a coil portion including a primary coil and a secondary coil, at least a portion of which is arranged in the core portion; and a bobbin portion having at least a portion of the core portion and accommodating at least a portion of the coil portion, wherein the bobbin portion includes a through hole formed in the center; a central portion vertically overlapping the core portion; a first region extending from the central portion in a second direction intersecting the first direction; and a second region facing the first region in the second direction centered on the central portion, and including at least one bus bar capable of implementing a cross between a plurality of wires constituting the secondary coil in the second region.

[0011] In the transformer according to the present invention, the bus bar may be formed of any one of a conductive wire, a PCB, and a bobbin structure.

[0012] In the transformer according to the present invention, the second coil comprises a first conductive line forming a turn in a clockwise direction with the through hole as the center; a second conductive line forming a turn in a clockwise direction outside the first conductive line with the through hole as the center in a plane; a third conductive line forming a turn in a counterclockwise direction with the through hole as the center; and a fourth conductive line forming a turn in a counterclockwise direction outside the third conductive line with the through hole as the center in a plane.

[0013] In the transformer according to the present invention, some of the plurality of wires constituting the secondary coil may be electrically connected to each other in the first region to form a center tap structure.

[0014] In the transformer according to the present invention, the center tap can be implemented by soldering.

[0015] In the transformer according to the present invention, a plurality of wires constituting the secondary coil are arranged side by side on a plane in a second direction perpendicular to the first direction in the first region and the central portion.

[0016] In the transformer according to the present invention, the plurality of wires constituting the secondary coil can be arranged alternately in two lines each in the first region and the central portion.

[0017] In the transformer according to the present invention, a plurality of wires constituting the secondary coil may be arranged asymmetrically around the through hole in the central portion.

[0018] In the transformer according to the present invention, the bus bar may include a first bus bar and a second bus bar that are parallel to the second direction.

[0019] In the transformer according to the present invention, the first bus bar and the second bus bar may each include conductive patterns that are insulated from each other.

[0020] In a transformer according to one embodiment of the present invention, the first bus bar may include a 1-1 conductive pattern connected to the third conductive line and transmitting a first signal; and a 1-2 conductive pattern connected to the fourth conductive line and parallel to the 1-1 conductive pattern in the second direction and transmitting a first signal, and the second bus bar may include a 2-1 conductive pattern connected to the first conductive line and transmitting a second signal; and a 1-2 conductive pattern connected to the first conductive line and parallel to the 2-1 conductive pattern in the second direction and transmitting a second signal.

[0021] In the transformer according to the present invention, the first bus bar and the second bus bar may each have a structure shape through which a thin conductive wire can pass through the inside.

[0022] In a transformer according to another embodiment of the present invention, the second region may include one bus bar having the third conductive line and the fourth conductive line connected at one end to transmit a first signal, and a first conductive line and a second conductive line arranged parallel to the one bus bar in the second direction to transmit a second signal, and the third conductive line and the fourth conductive line connected to the other end of the one bus bar may be arranged to intersect with the first conductive line and the second conductive line so as to overlap along the first direction.

[0023] In a transformer according to another embodiment of the present invention, the second region may include a bus bar having the first conductive line and the second conductive line connected at one end to transmit a second signal; and a third conductive line and a fourth conductive line arranged parallel to the one bus bar in the second direction to transmit the first signal, and the third conductive line and the fourth conductive line may be arranged to intersect with the one bus bar so as to overlap along the first direction.

[0024] A transformer according to an embodiment can exhibit the effect of reducing production time and production cost while alleviating the phenomenon of current concentration by crossing the secondary coils in some areas using a cross auxiliary structure.

[0025] Figure 1 is an exploded perspective view showing an example of a typical transformer configuration.

[0026] Figure 2a shows a plan view of a transformer according to one embodiment.

[0027] Figure 2b shows a plan view of the transformer illustrated in Figure 2a with the core portion removed.

[0028] Fig. 2c shows a cross-sectional view according to an embodiment taken along line A-A' of Fig. 2a.

[0029] Figure 3 shows a plan view of a secondary coil and a second bobbin according to one embodiment.

[0030] FIG. 4a shows a pin map of a second coil section according to one embodiment, and FIG. 4b is a circuit diagram of a transformer according to one embodiment.

[0031] Figure 5 shows a plan view of a secondary coil and a second bobbin according to another embodiment.

[0032] The present invention is susceptible to various modifications and embodiments. Specific embodiments are illustrated and described in the drawings. However, this is not intended to limit the present invention to specific embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention.

[0033] Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, a second component may be referred to as a first component, and similarly, a first component may also be referred to as a second component. The term "and / or" includes a combination of a plurality of related described items or any of a plurality of related described items.

[0034] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0035] In the description of embodiments, the description that each layer (film), region, pattern or structure is formed "on" or "under" the substrate, each layer (film), region, pad or pattern includes both being formed directly or through the interposition of another layer. The reference to "on" or "under" each layer is described based on the drawings. In addition, the thickness or size of each layer (film), region, pattern or structure in the drawings may be modified for clarity and convenience of description, and therefore does not entirely reflect the actual size.

[0036] The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms "comprise" or "have" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0037] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0038] Hereinafter, embodiments will be described in detail with reference to the attached drawings. Regardless of the drawing numbers, identical or corresponding components will be given the same reference numbers, and redundant descriptions thereof will be omitted.

[0039] In addition, some embodiments are described using a Cartesian coordinate system (x-axis, y-axis, z-axis), and in the Cartesian coordinate system, the x-axis, y-axis, and z-axis shown in each drawing are orthogonal to each other, but the embodiments are not limited thereto. The x-axis, y-axis, and z-axis may intersect each other. Hereinafter, for convenience of description, the z-direction is referred to as a vertical direction, and the x-axis direction and the y-axis direction are each referred to as horizontal directions. In addition, the z-axis direction is referred to as a first direction, the x-axis direction is referred to as a second direction, and the y-axis direction is referred to as a third direction.

[0040] Hereinafter, a transformer according to an embodiment will be described in detail with reference to the attached drawings.

[0041] FIG. 2a is a plan view of a transformer according to one embodiment, FIG. 2b is a plan view showing a form in which a core portion is removed from a transformer according to one embodiment, and FIG. 2c is a cross-sectional view showing a cross-section of a transformer according to one embodiment taken along line A-A' of a core portion (CA) in FIG. 2a.

[0042] Referring to FIGS. 2A to 2C together, a transformer (100) according to one embodiment may include a core portion (111, 112), a primary coil portion (120), and a secondary coil portion (130). Each component is described in detail below.

[0043] The core portion (111, 112) has the characteristics of a magnetic circuit and can act as a path for magnetic flux. The core portion (111, 112) may include an upper core (111) coupled from the upper side and a lower core (112) coupled from the lower side. The two cores (111, 112) may have a shape that is symmetrical with respect to each other vertically or may have an asymmetrical shape. However, in the following description, it is assumed that they have a shape that is symmetrical with respect to each other vertically for the convenience of explanation.

[0044] Each of the upper core (111) and the lower core (112) may include a body portion in the form of a flat plate and a leg portion protruding from the body portion in the thickness direction (i.e., in the z-axis direction) and extending along a predetermined direction. The upper core (111) may include two outer legs (OL1, OL2) extending along one axis (here, the x-axis) on a plane and spaced apart from each other along the other axis (here, the y-axis) direction, and one intermediate leg (CL1) arranged between the two outer legs (OL1, OL2). The lower core (112) may include two outer legs (OL3, OL4) extending along the x-axis direction on a plane and spaced apart from each other along the y-axis direction, and one intermediate leg (CL2) arranged between the two outer legs (OL3, OL4).

[0045] When the upper core (111) and the lower core (112) are connected vertically, each of the outer legs (OL1, OL2) and the middle leg (CL1) of the upper core (111) faces the corresponding outer legs (OL3, OL4) or middle leg (CL2) of the lower core (112). At this time, although not shown, a gap of a predetermined distance (for example, 10 to 100 um, but not necessarily limited thereto) may be formed between at least some of the outer leg pairs or middle leg pairs that face each other.

[0046] Additionally, the core portion (111, 112) may include a magnetic material, for example, iron or ferrite, but is not necessarily limited thereto.

[0047] The primary coil section (120) may include a first bobbin (B1) having a first through hole (CH1) in the center, and a primary coil (C1) wound to form a plurality of turns centered around the first through hole (CH1) within the receiving space of the first bobbin.

[0048] The secondary coil part (130) may include a second bobbin (B2) having a second through-hole (CH2 in FIG. 3) in the center, and a secondary coil (C2) arranged to form a turn centered around the second through-hole (CH2) within the receiving space of the second bobbin (B2). Here, at least a portion of the primary coil part (120) may be arranged in the second through-hole (CH2). Accordingly, at least a portion of the primary coil part (120) and the secondary coil part (130) may overlap along the x-axis direction and the y-axis direction.

[0049] The accommodation space of the second bobbin (B2) can be defined by an upper plate (TP), a lower plate (BP), and a side wall portion (SW) disposed between the upper plate (TP) and the lower plate (BP).

[0050] The primary coil (C1) and the secondary coil (C2) may be multiple windings of a rigid conductive metal, such as copper conductive wire, wound several times in a spiral or flat spiral shape, but are not necessarily limited thereto. For example, the primary coil (C1) may be enameled wire wrapped with fiber yarn (USTC wire), Litz wire, triple insulated wire (TIW: Triple Insulated Wire), etc.

[0051] According to an embodiment, the primary coil section (120) may correspond to the primary coil of the transformer (100), and the secondary coil section (130) may correspond to the secondary coil of the transformer (100), but is not necessarily limited thereto. In addition, the diameter of the secondary coil (C2) may be 0.7 to 0.9 times the height of the second bobbin (B2) in the z-axis direction, but is not necessarily limited thereto.

[0052] A more detailed configuration of the secondary coil section is described with reference to Fig. 3.

[0053] FIG. 3 is a plan view showing an example of a secondary coil configuration according to one embodiment.

[0054] In Fig. 3, for convenience of explanation, the upper plate (TP) of the second bobbin (B2) is shown with the upper plate (TP) removed.

[0055] The secondary coil section (130A) illustrated in FIG. 3 may include a second bobbin (B2), a secondary coil (C2), and a plurality of terminal pins (T1, T2, T3, T4, T5, T6, T7, T8).

[0056] The second bobbin (B2) may include a central portion (CP), a first region (1P) located on one side of the central portion (CP) in the x-axis direction, and a second region (2P) located on the other side of the central portion (CP) opposite the first region (1P) in the x-axis direction.

[0057] A second through hole (CH2) may be arranged in the central portion (CP), and a plurality of terminal pins (T1, T2, T3, T4, T5, T6, T7, T8) may be arranged in a row along the y-axis direction in the first region (1P).

[0058] The secondary coil (C2) may include a plurality of conductive lines (L1, L2, L3, L4). The plurality of conductive lines (L1, L2, L3, L4) may be arranged parallel to each other along the x-axis direction on an imaginary plane formed by the x-axis and the y-axis at the center (CP).

[0059] The two ends of the plurality of conductive lines (L1, L2, L3, L4) are electrically connected to different ones of the plurality of terminal pins (T1, T2, T3, T4, T5, T6, T7, T8), and each can form one turn centered on the second through hole (CH2). Accordingly, the efficiency of the transformer can be increased by lowering the resistance to the applied current, and the heat generated from the transformer can be suppressed by lowering the heat generation due to the resistance.

[0060] For example, both ends of the first conductive line (L1) are connected to the second terminal pin (T2) and the fifth terminal pin (T5), and both ends of the second conductive line (L2) are connected to the first terminal pin (T1) and the sixth terminal pin (T6), respectively. Both ends of the third conductive line (L3) are connected to the fourth terminal pin (T4) and the seventh terminal pin (T7), and both ends of the fourth conductive line (L4) can be connected to the third terminal pin (T3) and the eighth terminal pin (T8), respectively. In addition, the plurality of conductive lines (L1, L2, L3, L4) are arranged alternately in two lines each to transmit different signals in the central part (CP). The plurality of conductive lines (L1, L2, L3, L4) are arranged asymmetrically with the through hole (CH2) as the center in the central part (CP).

[0061] The second region (2P) is provided with at least one bus bar (200) capable of implementing a cross between a plurality of conductive lines (L1, L2, L3, L4) constituting the secondary coil at the central portion (CP). The bus bar (200) may be implemented in the form of any one of a conductive line, a printed circuit board (PCB), and a bobbin structure. In the present embodiment, the first bus bar (210) and the second bus bar (220) may be arranged parallel to each other in the y-axis direction. In the present embodiment, the first bus bar (210) and the second bus bar (220) are shown as being formed of a printed circuit board (PCB) in which the first bus bar (210) and the second bus bar (220) are parallel, but may also be formed of two conductive lines that are insulated from each other.

[0062] Each of a plurality of conductive lines (L1, L2, L3, L4) forming a secondary coil may extend such that one end thereof is disposed on a second region (2P), and the other end thereof is extended such that both ends thereof are disposed on a first region (1P). Conductive patterns (211, 212) are formed on the first bus bar (210) to transmit a first signal transmitted from the terminal pins (T7, T8) through the conductive lines (L3, L4) to the terminal pins (T4, T3), respectively.

[0063] Among the two conductive patterns of the first bus bar (210), one end of the 1-1 pattern (211) is connected to a fourth conductive line (L4) connected to a terminal pin (T8), and the other end of the 1-1 pattern (211) is connected to a fourth conductive line (L4) connected to a terminal pin (T3). Among the two conductive patterns of the first bus bar (210), one end of the 1-2 pattern (212) is connected to a third conductive line (L3) connected to a terminal pin (T7), and the other end of the 1-2 pattern (212) is connected to a third conductive line (L3) connected to a terminal pin (T4).

[0064] A conductive pattern (221, 222) is formed on the second bus bar (220) to transmit a second signal transmitted from the terminal pin (T1, T2) through the conductive line (L2, L1) to the terminal pin (T6, T5), respectively.

[0065] Among the two conductive patterns of the second bus bar (220), one end of the 2-1 pattern (221) is connected to a second conductive line (L2) connected to a terminal pin (T6), and the other end of the 2-1 pattern (221) is connected to a second conductive line (L2) connected to a terminal pin (T1). Among the two conductive patterns of the second bus bar (220), one end of the 2-2 pattern (222) is connected to a first conductive line (L1) connected to a terminal pin (T5), and the other end of the 1-2 pattern (212) is connected to a first conductive line (L1) connected to a terminal pin (T2).

[0066] At this time, the first bus bar (210) and / or the second bus bar (220) may have a structure in which a thin conductive line can penetrate the inside. The conductive line (L4, L3) for transmitting a signal to the terminal pin (T3, T4) via the first bus bar (210) is arranged to overlap with the second bus bar (220) in the z-axis direction.

[0067] In this embodiment, the first signal is transmitted to two conductive lines (L3, L4) through terminal pins (T7, T8) and to terminal pins (T4, T3) through the first bus bar (210), and the second signal is transmitted to two conductive lines (L1, L2) through terminal pins (T2, T1) and to terminal pins (T5, T6) through the second bus bar (220).

[0068] Meanwhile, in this embodiment, the arrangement of both the first bus bar (210) and the second bus bar (220) is exemplified, but the two wires (L1, L2) may be connected through the second bus bar (220) and the remaining two wires (L3, L4) may be arranged on the upper side of the second bus bar (220) in the x-axis direction and parallel to the second bus bar (220) in the y-axis direction in the second region (2P). At this time, the two wires (L3, L4) partially overlap the second bus bar (220) in the z-axis and cross the second bus bar (220). Conversely, the two wires (L3, L4) may be connected through the first bus bar (210) and the remaining two wires (L1, L2) may be arranged on the lower side of the first bus bar (210) in the x-axis direction and parallel to the first bus bar (210) in the y-axis direction in the second region (2P). At this time, the two wires (L3, L4) connecting the end of the first bus bar (210) and the terminal pins (T3, T4) are crossed with the two wires (L1, L2) in the second region (2P). The first conductive line (L1) and the second conductive line (L2) may intersect with the third conductive line (L3) and the fourth conductive line (L4) in the second region (2P) so that at least a portion thereof overlaps along the z-axis direction.

[0069] In Fig. 3, multiple conductive lines (L1, L2, L3, L4) are depicted as not overlapping each other along the z-axis direction in the central portion (CP), but some overlap may occur in the z-axis direction in the area adjacent to the second area (2P).

[0070] This terminal pin connection state and the crossing of the first bus bar (210) and the second bus bar (220) in the second region (2P) are for inductance matching between parts forming the same turn from a circuit perspective. This is explained with reference to FIGS. 4a and 4b.

[0071] Fig. 4a shows a pin map of a secondary coil section according to one embodiment, and Fig. 4b is a circuit diagram of a transformer according to one embodiment.

[0072] Referring to FIGS. 4A and 4B, the first conductive line (L1) and the second conductive line (L2) are connected in parallel to form a first turn portion (NS2) for the second signal of the secondary coil of the transformer, and the third conductive line (L3) and the fourth conductive line (L4) form a second turn portion (NS3) for the first signal of the secondary coil. In this case, the first terminal pin (T1) and the second terminal pin (T2) correspond to input terminals for the second signal, and the fifth terminal pin (T5) and the sixth terminal pin (T6) correspond to grounds for the second signal. In addition, the seventh terminal pin (T7) and the eighth terminal pin (T8) correspond to input terminals for the first signal, and the third terminal pin (T3) and the fourth terminal pin (T4) correspond to grounds for the first signal. Here, the grounds of each signal can be electrically connected to each other to form a so-called center tap (CT) structure. The center tap (CP) can be connected to the ground using soldering, but is not necessarily limited to this.

[0073] Due to the connection between the conductive wires and the terminal pins, the first conductive wire (L1) and the second conductive wire (L2) constituting the first turn portion (NS2) in parallel have an asymmetrical shape in the plane along the x-axis direction with respect to the third conductive wire (L3) and the fourth conductive wire (L4) constituting the second turn portion (NS3) in parallel and the second through hole (CH2). Therefore, since the first turn portion (NS2) and the second turn portion (NS3) have substantially the same conductive wire configuration, the inductance deviation due to the difference in the length of the conductive wires is minimized, thereby reducing heat generation due to current concentration.

[0074] Fig. 5 is a plan view showing an example of a second coil unit configuration according to another embodiment. The configuration of the second coil unit (130B) according to another embodiment illustrated in Fig. 5 is identical to the configuration of the second coil unit (130A) according to the embodiment of Fig. 3, except for the short circuits (SP1, SPC, SP2), and therefore, redundant descriptions will be omitted.

[0075] Referring to FIG. 5, the second bobbin (B2) may include a plurality of short-circuiting portions (SP1, SPC, SP2) that short-circuit at least one pair of the plurality of terminal pins. Specifically, the first terminal pin (T1) and the second terminal pin (T2) corresponding to the input terminal of the second signal may be short-circuited through the first short-circuiting portion (SP1). In addition, the seventh terminal pin (T7) and the eighth terminal pin (T8) corresponding to the input terminal of the first signal may be short-circuited through the second short-circuiting portion (SP2). In addition, two pairs of terminal pins corresponding to the ground of the center-tap configuration, i.e., the third to sixth terminal pins (T3, T4, T5, T6), may be short-circuited through the center short-circuiting portion (SPC).

[0076] Here, each short circuit (SP1, SP2, SPC) can be implemented through soldering, but this is an example and is not necessarily limited thereto, and is not limited to any method as long as short circuiting between terminal pins is possible. For example, each short circuit (SP1, SP2, SPC) can be implemented through a conductive clip, a conductive pin, or a combination of these and soldering. In this example, each short circuit (SP1, SP2, SPC) is arranged between terminal pins, but according to another embodiment, it can be arranged between the ends of each of a plurality of conductive lines.

[0077] As described above, the transformer according to the present invention can simplify the cross-winding work in the second region to reduce the current concentration phenomenon of the secondary coil, thereby simplifying the slim transformer production process and improving productivity, and by configuring the crossed portion as a bus bar, a heat dissipation effect can be expected.

[0078] Although the above has been described focusing on embodiments, these are merely examples and do not limit the present invention. Those skilled in the art to which the present invention pertains will appreciate that various modifications and applications not exemplified above are possible without departing from the essential characteristics of the present embodiment. For example, each component specifically shown in the embodiments can be modified and implemented. In addition, differences related to such modifications and applications should be interpreted as being included within the scope of the present invention defined in the appended claims.

[0079] The mode for carrying out the invention has been sufficiently described in the above-mentioned “Best mode for carrying out the invention.”

[0080] The transformer according to the embodiment can be used in a power supply device of an electronic device, etc.

Claims

1. A core portion including a lower core and an upper core arranged in a first direction from the lower core; A coil section including a primary coil and a secondary coil, at least part of which is disposed in the core section; and A bobbin portion having at least a portion disposed in the core portion and accommodating at least a portion of the coil portion, The above bobbin part, A through hole formed in the center; A central portion vertically overlapping the core portion; A first region extending from the central portion in a second direction intersecting the first direction; and A second region is included that faces the first region in the second direction with the central portion as the center, A transformer comprising at least one bus bar capable of implementing a cross between a plurality of conductive lines constituting the secondary coil in the second region.

2. A transformer in the first paragraph, wherein the bus bar is made of one of a conductive wire, a PCB, and a bobbin structure.

3. In the second paragraph, the plurality of conductive lines constituting the second coil are A first conductive wire forming a turn clockwise around the above through hole; A second conductive line forming a turn clockwise outside the first conductive line with the through hole as the center on the plane; A third conductive line forming a turn counterclockwise around the above through hole; and A transformer including a fourth conductive line that forms a turn counterclockwise toward the outside of the third conductive line centered on the through hole on a plane.

4. A transformer in the third paragraph, wherein the plurality of conductive lines constituting the secondary coil are arranged parallel to each other on a plane in the second direction in the first region and the central portion.

5. In the fourth paragraph, a transformer in which the plurality of conductive lines constituting the secondary coil are arranged alternately in two lines each in the first region and the central portion.

6. In the fifth paragraph, a transformer in which the plurality of conductive lines constituting the secondary coil are arranged asymmetrically with the through hole as the center.

7. In the sixth paragraph, the transformer includes a first bus bar and a second bus bar that are parallel to the second direction.

8. A transformer in accordance with claim 7, wherein the first bus bar and the second bus bar each include a conductive pattern that is insulated from each other.

9. In paragraph 8, The above first bus bar, A 1-1 conductive pattern connected to the third conductive line and transmitting a first signal; and It includes a 1-2 conductive pattern that is connected to the 4th conductive line and transmits a first signal while being parallel to the 1-1 conductive pattern in the 2nd direction, The above second bus bar, A second-1 conductive pattern connected to the first conductive line and transmitting a second signal; and A transformer including a 1-2 conductive pattern that is connected to the second conductive line and is parallel to the 2-1 conductive pattern in the second direction and transmits a second signal.

10. A transformer in the 7th paragraph, wherein the first bus bar and the second bus bar each have a structure in the form of a structure through which a thin conductive wire can pass through the inside.

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