Transformer

Abstract

The present invention relates to a transformer, in which a plurality of T-shaped short-circuit-inducing parts are disposed in a terminal region formed on a bobbin, and a plurality of conductive lines are connected to each of the short-circuit-inducing parts, thereby reducing the number of pin terminals for fixing the plurality of conductive lines, and thus reducing inductance deviation, and reducing heat generation, due to a heat dissipation effect.

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 second coil (13) and a first coil (14) between the upper core (11) and the lower core (12). The second coil (13) is usually composed of a plurality of conductive metal plates, and the first coil (14) has a form in which a conductive wire is wound. 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 first and second coils overlap vertically, but instead of a conductive metal plate, a conductive wire may be applied to the second coil. In this case, since the thickness of the secondary coil usable in a slim transformer is limited, the secondary coils are used in parallel when driving a certain current or more.

[0007] Since the secondary coil is configured by arranging multiple conductive wires in parallel, the number of pin terminals connected to each conductive wire increases.

[0008] The present invention aims to provide a transformer capable of reducing inductance deviation by reducing the number of pin terminals for fixing a plurality of conductive lines.

[0009] Another object of the present invention is to provide a transformer having a configuration capable of reducing heat generation through a heat dissipation effect.

[0010] In order to achieve these objects, a transformer according to the present invention comprises a core portion including an upper core and a lower core; a bobbin at least a portion of which is disposed between the upper core and the lower core; and a first coil and a second coil at least a portion of which are disposed on the bobbin, the second coil including a plurality of conductive lines, the bobbin including a central portion vertically overlapping the core portion; a through hole formed in the central portion; a first region disposed on one side of the bobbin in a first direction from the central portion; a plurality of short-circuiting portions disposed in the first region and short-circuiting at least one pair of the plurality of conductive lines; and a plurality of insertion holes formed in the first region for fixing the plurality of short-circuiting portions, the plurality of short-circuiting portions including a first short-circuiting portion, a second short-circuiting portion, and a third short-circuiting portion, the second short-circuiting portion being disposed between the first short-circuiting portion and the third short-circuiting portion, the width of the second short-circuiting portion being greater than the widths of the first short-circuiting portion and the third short-circuiting portion, the plurality of short-circuiting portions including a connecting portion inserted into the insertion hole and having one side fixed to a circuit board; It is characterized by comprising a heat dissipation portion extending in the first direction from the other side of the above-mentioned connecting portion; and a plurality of protrusions protruding from the other side of the above-mentioned connecting portion in a direction opposite to the above-mentioned connecting portion at a distance from each other, to which at least one of the plurality of conductive lines is respectively connected.

[0011] In a transformer according to the present invention, the second coil includes a first conductive line having one end connected to the first short-circuit portion and forming a turn clockwise about the through hole and the other end connected to the second short-circuit portion to transmit a first signal; a second conductive line having one end connected to the third short-circuit portion and forming a turn counterclockwise about the through hole and the other end connected to the second short-circuit portion to transmit a second signal; a third conductive line having one end connected to the first short-circuit portion and forming a turn clockwise about the through hole and the other end connected to the second short-circuit portion to transmit the first signal; and a fourth conductive line having one end connected to the third short-circuit portion and forming a turn counterclockwise about the through hole and the other end connected to the second short-circuit portion to transmit the second signal.

[0012] In the transformer according to the present invention, the third conductive line forms a turn on the outside of the first conductive line on a plane, and the fourth conductive line forms a turn on the outside of the second conductive line on a plane.

[0013] In the transformer according to the present invention, the first short circuit corresponds to an input terminal for the first signal, the third short circuit corresponds to an input terminal for the second signal, and the second short circuit corresponds to a ground for the first signal and the second signal.

[0014] In the transformer according to the present invention, in the first short circuit section, each end of the first conductive line and the third conductive line are electrically connected to each other, in the third short circuit section, each end of the second conductive line and the fourth conductive line are electrically connected to each other, and in the second short circuit section, each other end of the first conductive line and the third conductive line and each other end of the second conductive line and the fourth conductive line are all electrically connected to each other.

[0015] In the transformer according to the present invention, the size of the heat dissipation portion may be the same as the size of the connection portion.

[0016] A transformer according to the present invention, wherein the first short circuit portion and the third short circuit portion each include two protrusions, and the second short circuit portion includes four protrusions.

[0017] In a transformer according to the present invention, the bobbin includes a second region arranged on the other side facing the first region in the first direction based on the central portion, and a plurality of conductive lines forming the second coil may be arranged to form turns through the first region and the second region with the through hole as the center.

[0018] In the transformer according to the present invention, a plurality of conductive lines constituting the second coil may extend parallel to each other along the first direction from the central portion.

[0019] In the transformer according to the present invention, at least a portion of the first conductive line and the third conductive line may overlap and intersect with the second conductive line and the fourth conductive line along a second direction orthogonal to the first direction in the second region.

[0020] A transformer according to an embodiment can reduce inductance deviation by reducing the number of pin terminals for fixing multiple conductive lines and can exhibit an effect of reducing heat generation through a heat dissipation effect.

[0021] Figure 1 is an exploded perspective view showing an example of a typical transformer configuration.

[0022] Figure 2a shows a plan view of a transformer according to one embodiment.

[0023] Figure 2b shows a plan view of the transformer illustrated in Figure 2a with the core portion removed.

[0024] Fig. 2c shows a cross-sectional view according to an embodiment taken along line A-A' of Fig. 2a.

[0025] Figure 3 shows a plan view of a second coil and a second bobbin according to one embodiment.

[0026] Figure 4a is a perspective view showing the first short circuit section and the third short circuit section among the plurality of short circuit sections used in the transformer according to the present invention.

[0027] Figure 4b is a perspective view showing a second short circuit section among a plurality of short circuit sections used in a transformer according to the present invention.

[0028] Figure 5a is a perspective view showing a state in which multiple short circuit sections are combined in a transformer according to the present invention.

[0029] Figure 5b is a bottom perspective view showing a state in which multiple short circuits are combined in a transformer according to the present invention.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] Hereinafter, embodiments will be described in detail with reference to the attached drawings. Regardless of the drawing symbols, identical or corresponding components will be given the same reference numbers, and redundant descriptions thereof will be omitted.

[0037] 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 x-axis direction is referred to as a first direction, the z-axis direction is referred to as a second direction, and the y-axis direction is referred to as a third direction.

[0038] Hereinafter, a transformer according to an embodiment will be described in detail with reference to the attached drawings.

[0039] 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.

[0040] Referring to FIGS. 2A to 2C together, a transformer (100) according to one embodiment may include a core portion (111, 112), a first coil portion (120), and a second coil portion (130). Each component is described in detail below.

[0041] 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.

[0042] 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).

[0043] 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 μm to 100 μm, 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.

[0044] Additionally, the core portion (111, 112) may include a magnetic material, for example, iron or ferrite, but is not necessarily limited thereto.

[0045] The first coil section (120) may include a first bobbin (B1) having a first through hole (CH1) in the center, and a first coil (C1) wound to form a plurality of turns centered around the first through hole (CH1) within the receiving space of the first bobbin (B1).

[0046] The second coil portion (130) may include a second bobbin (B2) having a second through-hole (CH2 in FIG. 3) in the center, and a second 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 first coil portion (120) may be arranged in the second through-hole (CH2). Accordingly, at least a portion of the first coil portion (120) and the second coil portion (130) may overlap along the x-axis direction and the y-axis direction.

[0047] 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).

[0048] The first coil (C1) and the second coil (C2) may be multiple windings of a rigid conductive metal, for example, copper conductive wire, wound several times in a spiral or flat spiral shape, but are not necessarily limited thereto. For example, the first coil (C1) may be enameled wire wrapped with fiber yarn (USTC wire), Litz wire, triple insulated wire (TIW: Triple Insulated Wire), etc.

[0049] According to an embodiment, the first coil portion (120) may correspond to the first coil of the transformer (100), and the second coil portion (130) may correspond to the second coil of the transformer (100), but is not necessarily limited thereto. In addition, the diameter of the second 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.

[0050] A more detailed configuration of the second coil section is described with reference to Fig. 3.

[0051] Fig. 3 is a plan view illustrating an example of a second coil section configuration according to one embodiment. In Fig. 3, for convenience of explanation, the upper plate (TP) of the second bobbin (B2) is illustrated with the upper plate (TP) removed.

[0052] The second coil portion (130A) illustrated in Fig. 3 may include a second bobbin (B2), a second coil (C2), and a plurality of short-circuit portions (SP1, SP2, SP3). As illustrated, a plurality of short-circuit portions (SP1, SP2, SP3) are arranged in a first region (1P) formed in the second bobbin (B2), and a plurality of conductive lines (L1, L2, L3, L4) are connected to each of the short-circuit portions (SP1, SP2, SP3).

[0053] 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 opposite the first region (1P) based on the central portion (CP).

[0054] A second through hole (CH2) may be arranged in the central portion (CP), and a plurality of short sections (SP1, SP2, SP3) may be arranged in parallel with each other along the first direction (x-axis direction) in the first region (1P).

[0055] The above-described plurality of paragraphs (SP1, SP2, SP3) include a first paragraph (SP1), a second paragraph (SP2), and a third paragraph (SP3) sequentially arranged along the y-axis direction.

[0056] The first paragraph (SP1) and the third paragraph (SP3) may have the same width. The width of the second paragraph (SP2) is relatively larger than the widths of the first paragraph (SP1) and the third paragraph (SP3).

[0057] The second 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 central portion (CP).

[0058] The two ends of the plurality of conductive lines (L1, L2, L3, L4) are each electrically connected to a different one of the plurality of short circuits (SP1, SP2, SP3), and each can form one turn centered on the second through hole (CH2).

[0059] The first conductive line (L1) has one end connected to the first short section (SP1) and forms a turn clockwise around the second through hole (CH2), and the other end is connected to the second short section (SP2) to transmit a first signal. The second conductive line (L2) has one end connected to the third short section (SP3), and forms a turn counterclockwise around the second through hole (CH2), and the other end is connected to the second short section (SP2) to transmit a second signal. The third conductive line (L3) has one end connected to the first short section (SP1), and forms a turn clockwise around the second through hole (CH2), and the other end is connected to the second short section (SP2) to transmit the first signal. The fourth conductive line (L4) is connected at one end to the third short section (SP3) and forms a turn counterclockwise around the second through hole (CH2) to transmit the second signal at the other end to the second short section (SP2).

[0060] A plurality of conductive lines (L1, L2, L3, L4) are arranged alternately in pairs to transmit different signals. The plurality of conductive lines (L1, L2, L3, L4) are arranged asymmetrically around the second through hole (CH2) in the central portion (CP).

[0061] Each of the plurality of conductive lines (L1, L2, L3, L4) is connected at one end to one of the plurality of short-circuit sections (SP1, SP2, SP3) arranged in the first region (1P), and each other end is connected again to one of the plurality of short-circuit sections (SP1, SP2, SP3) of the first region (1P) via the central portion (CP) and the second region (2P).

[0062] Among the plurality of conductive lines (L1, L2, L3, L4), at least a portion of the first conductive line (L1) and the third conductive line (L3) overlap and intersect with the second conductive line (L2) and the fourth conductive line (L4) along a second direction (z-axis direction) orthogonal to the first direction (x-axis direction) in the second region (2P).

[0063] The first paragraph (SP1) corresponds to an input terminal for the first signal, the third paragraph (SP3) corresponds to an input terminal for the second signal, and the second paragraph (SP2) corresponds to a ground for the first signal and the second signal.

[0064] In the first short circuit portion (SP1), each end of the first conductive line (L1) and the third conductive line (L3) are electrically connected to each other, in the third short circuit portion (SP3), each end of the second conductive line (L2) and the fourth conductive line (L4) are electrically connected to each other, and in the second short circuit portion (SP2), each other end of the first conductive line (L1) and the third conductive line (L3) and each other end of the second conductive line (L2) and the fourth conductive line (L4) are all electrically connected to each other.

[0065] The third conductive line (L3) forms a turn on the outside of the first conductive line (L1) on the plane, and the fourth conductive line (L4) forms a turn on the outside of the second conductive line (L2) on the plane.

[0066] A plurality of insertion holes (H1, H2, H3) for fixing the plurality of short sections (SP1, SP2, SP3) are formed in the first region (1P) of the second bobbin (B2).

[0067] Fig. 4a is a perspective view showing a first short circuit section (SP1) and a third short circuit section (SP3) among a plurality of short circuit sections used in a transformer according to the present invention, and Fig. 4b is a perspective view showing a second short circuit section (SP2) among a plurality of short circuit sections used in a transformer according to the present invention. Components that implement the same function are described by assigning the same reference numerals.

[0068] Each of the short sections (SP1 to SP3) includes a connection section (200) that is inserted into each of the insertion holes (H1 to H3) and has one side fixed to the circuit board, a heat dissipation section (300) that extends in the first direction from the other side of the connection section (200), and a plurality of protrusions (400: 400A, 400B) that protrude from the other side (220) of the connection section (200) in a direction opposite to the connection section (200) at a distance from each other and to which at least one of the plurality of conductive lines is respectively connected. The heat dissipation section (300) may have the same size as the connection section (200), but this is merely an example and the present invention is not limited to this example.

[0069] The first paragraph part (SP1) and the third paragraph part (SP3) are formed in the same shape, and the second paragraph part (SP2) has a similar shape to the first paragraph part (SP1) and the third paragraph part (SP3), but includes relatively more protrusions for connecting the second coil than the first paragraph part (SP1) and the third paragraph part (SP3). The first paragraph part (SP1) and the third paragraph part (SP3) each include two protrusions (410, 420), and the second paragraph part (SP2) includes four protrusions (410, 420, 430, 440).

[0070] This embodiment is based on a case where the conductive line transmitting the first signal is divided into a first conductive line and a third conductive line, and the conductive line transmitting the second signal is divided into a second conductive line and a fourth conductive line in order to reduce the thickness of the second coil. If the conductive lines transmitting the first signal and the second signal are each divided into three or more conductive lines to reduce the thickness, each short circuit section may include more lead sections to connect three or more conductive lines.

[0071] Fig. 5a is a perspective view showing a state in which a plurality of short-circuit sections are combined in a transformer according to the present invention, and Fig. 5b is a bottom perspective view showing a state in which a plurality of short-circuit sections are combined in a transformer according to the present invention. As shown, a plurality of short-circuit sections (SP1, SP2, SP3) are arranged in a first region (1P) formed in a second bobbin (B2), and a plurality of conductive lines (L1, L2, L3, L4) are connected to each of the short-circuit sections (SP1, SP2, SP3).

[0072] One end of the first short section (SP1) is inserted into the first insertion hole (H1) and fixed to a circuit board arranged below, one end of the second short section (SP2) is inserted into the second insertion hole (H2) and fixed to a circuit board arranged below in the form of a bus bar, and one end of the third short section (SP3) is inserted into the third insertion hole (H3) and fixed to a circuit board arranged below in the form of a bus bar.

[0073] Each protrusion is connected to one of a plurality of conductive wires. Various connection methods, including soldering, are possible.

[0074] One end of a third conductive line (L3) is connected to the first protrusion (410-1) of the first short section (SP1), and one end of a first conductive line (L1) is connected to the second protrusion (420-1) of the first short section (SP1). The other end of a fourth conductive line (L4) is connected to the second protrusion (410-2) of the second short section (SP2), the other end of the second conductive line (L2) is connected to the second protrusion (420-2), the other end of the first conductive line (L1) is connected to the third protrusion (430-2), and the other end of the third conductive line (L3) is connected to the fourth protrusion (440-2). One end of the second conductive line (L2) is connected to the first protrusion (410-3) of the third paragraph (SP3), and one end of the fourth conductive line (L4) is connected to the second protrusion (420-3) of the third paragraph (SP3).

[0075] As described above, the transformer according to the present invention can shorten the manufacturing time by arranging the plurality of conductive wires constituting the second coils in parallel with “T”-shaped short-circuits instead of “I”-shaped pins, thereby reducing the number of soldering points based on the component by half or more. In addition, the inductance deviation occurring between the turns of the plurality of conductive wires due to the short-circuit between the pin terminals can be reduced, and the heat dissipation effect through the wide heat dissipation area on the surface of the short-circuit part can lower the heat generation of the component.

[0076] 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.

[0077] The mode for carrying out the invention has been sufficiently described in the above-mentioned “Best mode for carrying out the invention.”

[0078] The transformer according to the embodiment can be used in a power supply device of an electronic device, etc.

Claims

1. Core section including an upper core and a lower core; a bobbin at least partly disposed between the upper core and the lower core; and comprising a first coil and a second coil, at least part of which is disposed on the bobbin; The second coil includes a plurality of conductive lines, The above bobbin, A central portion vertically overlapping the core portion; A through hole formed in the central portion; A first region arranged on one side of the bobbin in a first direction from the central portion; A plurality of short-circuiting sections arranged in the first region and short-circuiting at least one pair of the plurality of conductive lines; and It includes a plurality of insertion holes formed in the first region and fixing the plurality of paragraphs, The above multiple paragraphs include a first paragraph, a second paragraph, and a third paragraph, The second paragraph is positioned between the first paragraph and the third paragraph, The width of the second paragraph is greater than the width of the first paragraph and the third paragraph, The above multiple paragraphs are: A connecting part inserted into the above insertion hole and having one side fixed to the circuit board; A heat dissipation portion extending in the first direction from the other side of the above connecting portion; and A transformer including a plurality of protrusions protruding from the other side of the connection portion in the opposite direction to the connection portion at a distance from each other, and each protrusion being connected to at least one of the plurality of conductive lines.

2. In the first paragraph, the second coil, A first conductive line having one end connected to the first paragraph and forming a turn clockwise around the through hole, and the other end connected to the second paragraph to transmit a first signal; A second conductive wire having one end connected to the third paragraph and forming a turn counterclockwise around the through hole, and the other end connected to the second paragraph to transmit a second signal; A third conductive line having one end connected to the first paragraph and forming a turn clockwise around the through hole and the other end connected to the second paragraph to transmit the first signal; and A transformer including a fourth conductive line, one end of which is connected to the third paragraph and forms a turn counterclockwise around the through hole, and the other end of which is connected to the second paragraph and transmits the second signal.

3. In paragraph 2, The third conductive line forms a turn on the outside of the first conductive line on the plane, A transformer in which the fourth conductive line forms a turn on the outside of the second conductive line on a plane.

4. In paragraph 3, The above first paragraph corresponds to the input terminal for the first signal, The above third paragraph corresponds to the input terminal for the second signal, The second paragraph above is a transformer corresponding to the ground for the first signal and the second signal.

5. In paragraph 4, In the above first paragraph, each end of the first conductive line and the third conductive line are electrically connected to each other, In the third paragraph, each end of the second conductive line and the fourth conductive line are electrically connected to each other, A transformer in which the other ends of the first conductive line and the third conductive line and the other ends of the second conductive line and the fourth conductive line in the second paragraph are all electrically connected to each other.

6. In the first paragraph, a transformer having the same size as the size of the heat dissipation portion.

7. A transformer in the first paragraph, wherein the first paragraph and the third paragraph each include two protrusions, and the second paragraph includes four protrusions.

8. In the first paragraph, the bobbin includes a second region arranged on the other side opposite the first region in the first direction based on the central portion, A transformer in which a plurality of conductive lines forming the second coil are arranged to form turns through the first region and the second region with the through hole as the center.

9. In the 8th paragraph, a transformer in which a plurality of conductive lines constituting the second coil extend parallel to each other along the first direction from the central portion.

10. A transformer in the 9th paragraph, wherein at least a portion of the first conductive line and the third conductive line overlap and intersect with the second conductive line and the fourth conductive line along a second direction orthogonal to the first direction in the second region.

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