Transformer

Abstract

A transformer according to an embodiment comprises: a bobbin disposed at least partially in a core region between a first core and a second core; and a coil part including a plurality of conductive lines. The bobbin includes: a central part; a first outer peripheral part and a second outer peripheral part located on opposite sides of the central part in a first direction; and a plurality of terminal pins which are arranged on the first outer peripheral part and to which different ends of the plurality of conductive lines are connected. The plurality of conductive lines include: an inner conductive line that forms a turn around a through-hole; and an outer conductive line that forms a turn on the outside of the inner conductive line. The plurality of terminal pins include: an inner terminal pin connected to an end of the inner conductive line; and an outer terminal pin connected to an end of the outer conductive line, wherein the outer terminal pin is disposed closer to the core region in the first direction than the inner terminal pin.

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 a core portion including an upper core (11) and a lower core (12), and a secondary coil (13) and a primary coil (14) between them (11, 12). The secondary coil (13) is usually composed of a plurality of conductive metal plates, and the primary 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] Various studies are being conducted to reduce the current saturation phenomenon and DC resistance deviation of the secondary coil of slim transformers used in TV displays.

[0007] The embodiment provides a transformer having minimized current imbalance deviation.

[0008] The embodiment provides a transformer having a simple configuration while reducing DC resistance variation.

[0009] A transformer according to one embodiment includes a first core; a second core disposed on the first core; a bobbin having a through hole formed therein and at least a portion of which is disposed in a core region between the first core and the second core; and a coil portion having a plurality of conductive lines disposed at least a portion of which is disposed on the bobbin, wherein the bobbin includes a central portion having the through hole formed therein and overlapping the core region in a third direction; and a first outer portion and a second outer portion positioned on opposite sides of the central portion in a first direction intersecting the third direction, wherein the plurality of conductive lines disposed in the central portion can overlap and intersect along the third direction.

[0010] For example, the coil portion may include a first coil arranged to form a turn centered on the through hole; and a second coil arranged to form a turn on the periphery of the first coil and including the plurality of conductive lines.

[0011] For example, the plurality of conductive lines may intersect at least one of the two opposing sides with the through hole in the second direction, which intersects the first direction and the third direction, respectively.

[0012] For example, the portion where the plurality of challenge lines intersect may be located in the middle of the central portion along the first direction.

[0013] For example, a first portion where the plurality of conductive lines intersect at one of the two sides may be located between the midpoint of the central portion and the first outer portion along the first direction, and a second portion where the plurality of conductive lines intersect at the other of the two sides may be located between the midpoint of the central portion and the second outer portion along the first direction.

[0014] For example, a first distance that the first part is spaced apart from the midpoint in the first direction may be the same as a second distance that the second part is spaced apart from the midpoint in the first direction.

[0015] For example, the plurality of conductive lines may include inner conductive lines forming turns centered around the through hole; and outer conductive lines forming turns at the periphery of the inner conductive lines.

[0016] For example, at least one of the two sides, the outer conductive line may cross over the inner conductive line.

[0017] For example, the inner conductive line and the outer conductive line may be arranged on the same horizontal plane in each of the first outer portion and the second outer portion.

[0018] According to another embodiment, a transformer comprises: a first core; a second core disposed on the first core; a bobbin having a through hole formed therein and at least a portion of which is disposed in a core region between the first core and the second core; and a coil portion at least a portion of which is disposed on the bobbin and includes a plurality of conductive lines, wherein the bobbin comprises a central portion having the through hole formed therein and vertically overlapping the core region; a first outer portion and a second outer portion positioned on opposite sides in a first direction with the central portion interposed therebetween; and a plurality of terminal pins disposed on the first outer portion and having different ends of each of the plurality of conductive lines connected thereto, wherein the plurality of conductive lines include inner conductive lines forming turns centered on the through hole; and outer conductive lines forming turns at an outer edge of the inner conductive lines, wherein the plurality of terminal pins include inner terminal pins connected to ends of the inner conductive lines; and outer terminal pins connected to ends of the outer conductive lines, wherein the outer terminal pins may be disposed closer to the core region in the first direction than the inner terminal pins.

[0019] For example, the outer terminal pin may be spaced apart from the core region by a first distance in the first direction, the inner terminal pin may be spaced apart from the core region by a second distance in the first direction, and the first distance may be smaller than the second distance.

[0020] For example, the inner terminal pin and the outer terminal pin may be arranged on different horizontal planes.

[0021] For example, in each of the central portion and the second outer portion, the plurality of conductive lines may be arranged on the same horizontal plane without intersecting or overlapping.

[0022] For example, in each of the central portion and the second outer portion, the plurality of conductive lines may be arranged at equal intervals in the horizontal direction.

[0023] For example, the first length of the entire turn between the two ends of the inner conductive line and the second length of the entire turn between the two ends of the outer conductive line may be equal to each other.

[0024] For example, the outer terminal pin may be arranged at a minimum distance from the core region in the first direction.

[0025] For example, the coil portion may include a first coil arranged to form a turn centered on the through hole; and a second coil arranged to form a turn on the periphery of the first coil and including the plurality of conductive lines.

[0026] A transformer according to one embodiment can minimize current imbalance deviation even at high frequencies.

[0027] In another embodiment, a transformer may be configured such that the contact point between the outer conductive line and the end of the terminal pin is positioned closer to the core than the contact point between the inner conductive line and the end of the terminal pin, thereby increasing the second length of the inner conductive line relative to the first length of the outer conductive line, thereby making the first length and the second length the same, thereby minimizing the DC resistance difference between the inner conductive line and the outer conductive line, thereby minimizing the DCR deviation during low-frequency operation, and simplifying the manufacturing process, thereby reducing the unit cost of components.

[0028] Figure 1 is an exploded perspective view showing an example of a typical transformer configuration.

[0029] Figure 2a shows a plan view of a transformer according to one embodiment.

[0030] Figure 2b shows a plan view of the transformer illustrated in Figure 2a with the core portion removed.

[0031] Fig. 2c shows a cross-sectional view according to an embodiment taken along line A-A' of Fig. 2a.

[0032] Figure 3 shows a plan view of a second coil and a second bobbin according to one embodiment.

[0033] Figure 4a shows a plan view of a transformer according to another embodiment.

[0034] Figure 4b shows a plan view of the transformer illustrated in Figure 4a with the core portion removed.

[0035] Fig. 5 shows a plan view of a second coil and a second bobbin according to another embodiment.

[0036] Figure 6 shows a plan view of a transformer according to the first comparative example.

[0037] Figure 7 shows a plan view of a transformer according to the second comparative example.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] In the description of the 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 explained 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 explanation, and therefore does not entirely reflect the actual size.

[0042] 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 exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0043] 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.

[0044] 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.

[0045] In addition, some embodiments are described using a Cartesian coordinate system (x-axis, y-axis, z-axis). In the Cartesian coordinate system, the x-axis, the y-axis, and the z-axis shown in each drawing are orthogonal to each other, but the embodiments are not limited thereto. The x-axis, the y-axis, and the 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 y-axis direction is referred to as a second direction, and the z-axis direction is referred to as a third direction.

[0046] Hereinafter, a transformer (100A) according to one embodiment will be described in detail with reference to the attached drawings.

[0047] Fig. 2a shows a plan view of a transformer (100A) according to one embodiment, Fig. 2b shows a plan view of the transformer (100A) shown in Fig. 2a with the core portion (110) removed, and Fig. 2c shows a cross-sectional view according to one embodiment taken along the line A-A' of Fig. 2a. Fig. 3 shows a plan view of a second coil (C2) and a second bobbin (B2) according to one embodiment.

[0048] Referring to FIGS. 2A to 2C and FIG. 3 together, a transformer (100A) according to one embodiment may include a core portion (110: 111, 112), first and second bobbins (B1, B2), and a coil portion. Each component is described in detail below.

[0049] The core portion (110) has the characteristics of a magnetic circuit and can act as a path for magnetic flux. The core portion (110) can include a first core (111) coupled from the lower side and a second core (112) coupled from the upper side. That is, the second core (112) can be placed on the first core (111). The first and second cores (111, 112) may have shapes that are symmetrical with respect to each other vertically, or may have asymmetric shapes. However, in the following description, it is assumed that they have vertically symmetrical shapes for the convenience of explanation.

[0050] Each of the first core (111) and the second core (112) may include a flat body portion and a plurality of leg portions that protrude from the body portion in the z-axis direction, that is, the thickness direction, and extend along a predetermined direction. For example, the plurality of leg portions may include two outer legs that extend along a first direction, that is, the x-axis direction, on a plane and are spaced apart from each other along a second direction, that is, the y-axis direction, and one middle leg (CL) that is arranged between the two outer legs. For example, the leg portion of the first core (111) protrudes toward the second core (112), and thus may be referred to as a 'first protrusion portion', and the leg portion of the second core (112) protrudes toward the first core (111), and thus may be referred to as a 'second protrusion portion'.

[0051] When the first core (111) and the second core (112) are connected vertically, each of the outer and middle legs of the first core (111) faces the corresponding outer or middle leg of the second core (112). At this time, 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 or middle leg pairs that face each other.

[0052] Additionally, the core portion (110: 111, 112) may include a magnetic material, for example, iron or ferrite, but is not necessarily limited thereto.

[0053] The first bobbin (B1) has a first through hole (CH1) formed in the center and can be at least partially disposed in the area (CA) between the first core (111) and the second core (112) (hereinafter referred to as the “core area”). The second bobbin (B2) has a second through hole (CH2) formed in the center and can be at least partially disposed in the core area (CA).

[0054] The coil portion is at least partially disposed on the bobbin, includes a plurality of conductive lines, and may include a first coil (120, C1) and a second coil (130, C2).

[0055] The first coil (120, C1) may be at least partially disposed on the first bobbin (B1). That is, the first coil (120, C1) may include a plurality of conductive wires wound to form a plurality of turns centered around the first through hole (CH1) within the receiving space of the first bobbin (B1).

[0056] The second coil (130, C2) may be at least partially disposed on the second bobbin (B2). That is, the second coil (130, C2) may include a plurality of conductive lines disposed to form turns centered around the second through hole (CH2) within the receiving space of the second bobbin (B2). For example, as illustrated in FIG. 2B, the second coil (130, C2) may form turns on the periphery of the first coil (120, C1) in a plane, but the embodiment is not limited to a specific relative position of the second coil (130, C2) with respect to the first coil (120, C1).

[0057] Here, the first coil (120, C1) and the second coil (130, C2) may overlap at least partially along the horizontal direction. Here, the horizontal direction may be the first direction and / or the second direction. In addition, the vertical direction means a direction perpendicular to the horizontal direction and may be a third direction.

[0058] Each of the first coil (120, C1) and the second coil (130, C2) may be a plurality of conductive wires (or multiple windings) in which a rigid conductive metal, for example, a copper conductive wire, is wound several times in a spiral or flat spiral shape, but is not necessarily limited thereto. For example, the first coil (120, C1) may be applied with an enameled wire (USTC wire) wrapped with fiber yarn, a Litz wire, a triple insulated wire (TIW: Triple Insulated Wire), etc.

[0059] According to an embodiment, the first coil (120, C1) may correspond to a primary coil of the transformer (100A), and the second coil (130, C2) may correspond to a secondary coil of the transformer (100A), but is not necessarily limited thereto.

[0060] Meanwhile, referring to FIG. 3, the configuration of the second bobbin (B2) according to one embodiment will be examined in detail as follows.

[0061] The second bobbin (B2) illustrated in FIG. 3 may include a central portion (CP), first and second outer portions (1P, 2P), and a plurality of terminal pins (T1 to T8). In this case, the plurality of terminal pins (T1 to T8) are described as components of the second bobbin (B2), but the embodiment is not limited thereto. That is, the plurality of terminal pins (T1 to T8) may be components that do not belong to the second bobbin (B2) but belong to the entire transformer (100A).

[0062] The central portion (CP) is a portion where a second through hole (CH2) is formed and arranged, and can overlap with the core region (CA) in the vertical direction.

[0063] The first and second outer portions (1P, 2P) may be positioned on opposite sides in the first direction with the central portion (CP) interposed therebetween. That is, the first outer portion (1P) may be positioned on one side in the first direction from the central portion (CP) or the second through hole (CH2), and the second outer portion (2P) may be positioned on the other side facing the first outer portion (1P) in the first direction from the central portion (CP) or the second through hole (CH2).

[0064] In the first outer portion (1P), a plurality of terminal pins (T1, T2, T3, T4, T5, T6, T7, T8) may be arranged in parallel along the second direction. Therefore, the first outer portion (1P) may be referred to as a 'terminal portion' because the plurality of terminal pins (T1, T2, T3, T4, T5, T6, T7, T8) are arranged therein. Unlike as illustrated in FIGS. 2A and 2B, as illustrated in FIG. 3, the plurality of terminal pins (T1, T2, T3, T4, T5, T6, T7, T8) may protrude outside the second bobbin (B2) in the -x-axis direction.

[0065] The second coil (130, C2) may include a plurality of conductive lines. The plurality of conductive lines may include an inner conductive line and an outer conductive line. The inner conductive line may form a turn centered on the second through hole (CH2), and the outer conductive line may form a turn at the outer edge of the inner conductive line. For example, as illustrated in FIG. 3, the outer conductive line may include two conductive lines (L1, L2), and the inner conductive line may include two conductive lines (L3, L4).

[0066] The two ends, that is, the ends, of the plurality of conductive lines (L1, L2, L3, L4) are each electrically connected to a different one 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).

[0067] Meanwhile, according to one embodiment, a plurality of conductive lines arranged in the central portion (CP), i.e., outer conductive lines (L1, L2) and inner conductive lines (L3, L4), may be arranged to overlap along a third direction, which is a vertical direction perpendicular to each of the first and second directions, while intersecting each other.

[0068] For example, as shown in FIG. 3, the outer conductive lines (L1, L2) may cross over the inner conductive lines (L3, L4), and unlike as shown in FIG. 3, the inner conductive lines (L3, L4) may cross over the outer conductive lines (L1, L2).

[0069] On the other hand, the outer conductive lines (L1, L2) and the inner conductive lines (L3, L4) can be arranged on the same horizontal plane in the first outer portion (1P) and the second outer portion (2P), respectively.

[0070] Additionally, the plurality of challenge lines may intersect at least one of the two opposing sides (S1, S2) with the second through hole (CH2) intersecting the first and third directions, respectively.

[0071] According to one embodiment, as illustrated in FIG. 3, a plurality of conductive lines (L1 to L4) may intersect on each of the two sides (S1, S2). At this time, the two sides (S1, S2) on which the plurality of conductive lines (L1 to L4) are arranged may have a planar shape that is symmetrical left / right with respect to the central axis (CX).

[0072] Alternatively, unlike as shown in FIG. 3, the plurality of conductive lines (L1 to L4) may intersect only on one side (S1) or only on the other side (S2) among the two sides (S1, S2).

[0073] Alternatively, the portion where multiple conductive lines intersect may be located in the middle (HC) of the central portion (CP) along the first direction. For example, referring to FIG. 3, the portion (H1) where the first to fourth conductive lines (L1 to L4) intersect on one side (S1) and the portion (H2) where the first to fourth conductive lines (L1 to L4) intersect on the other side (S2) may each coincide with the middle (HC) of the central portion (CP).

[0074] Alternatively, the first portion (H1) where the plurality of conductive lines intersect at one (S1) of the two sides (S1, S2) may be located between the midpoint (HC) of the central portion (CP) and the first outer portion (CP1) along the first direction, and the second portion (H2) where the plurality of conductive lines intersect at the other (S2) of the two sides (S1, S2) may be located between the midpoint (HC) of the central portion (CP) and the second outer portion (2P) along the first direction. At this time, the first distance by which the first portion (H1) is spaced apart from the midpoint (HC) in the first direction may be the same as the second distance by which the second portion (H2) is spaced apart from the midpoint (HC) in the first direction. That is, the distance (X11) by which the first portion (H1) is spaced apart from the second outer portion (2P) may be the same as the distance (X22) by which the second portion (H2) is spaced apart from the first outer portion (1P).

[0075] Alternatively, the first portion (H1) where the plurality of conductive lines intersect at one (S1) of the two sides (S1, S2) may be located between the midpoint (HC) of the central portion (CP) and the second outer portion (CP2) along the first direction, and the second portion (H2) where the plurality of conductive lines intersect at the other (S2) of the two sides (S1, S2) may be located between the midpoint (HC) of the central portion (CP) and the first outer portion (1P) along the first direction. At this time, the first distance by which the first portion (H1) is spaced apart from the midpoint (HC) in the first direction may be the same as the second distance by which the second portion (H2) is spaced apart from the midpoint (HC) in the first direction. That is, the distance (X12) by which the first portion (H1) is spaced apart from the first outer portion (1P) may be the same as the distance (X21) by which the second portion (H2) is spaced apart from the second outer portion (2P).

[0076] Hereinafter, a transformer (100B) according to another embodiment will be described with reference to the attached drawings.

[0077] FIG. 4a shows a plan view of a transformer (100B) according to another embodiment, FIG. 4b shows a plan view of the transformer (100B) shown in FIG. 4a with the core removed, and FIG. 5 shows a plan view of a second coil (C2') and a second bobbin (B2') according to another embodiment.

[0078] Fig. 2c may correspond to a cross-sectional view according to an embodiment taken along line A-A' of Fig. 4a. In this case, the second coil (C2, 130) and the second bobbin (B2) illustrated in Fig. 2c correspond to the second coil (C2', 130') and the second bobbin (B2') illustrated in Fig. 5, respectively.

[0079] In the transformer (100B) according to another embodiment, the same parts as in the above-described embodiment (100A) will be omitted for redundant description and only the different parts will be examined.

[0080] In a transformer (100B) according to another embodiment, the second coil (130', C2') and the second bobbin (B2') perform the same roles as the second core (130, C2) and the second bobbin (B2) described above, respectively, so description of the overlapping portions is omitted.

[0081] The second bobbin (B2') illustrated in FIG. 5 may include a central portion (CP), first and second outer portions (1P, 2P) and a plurality of terminal pins (T1' to T8').

[0082] In the first outer portion (1P), a plurality of terminal pins (T1', T2', T3', T4', T5', T6', T7', T8') may be arranged in parallel along the second direction. Therefore, the first outer portion (1P) may be referred to as a 'terminal portion' because the plurality of terminal pins (T1', T2', T3', T4', T5', T6', T7', T8') are arranged therein. Unlike as illustrated in FIGS. 4A and 4B, as illustrated in FIG. 5, the plurality of terminal pins (T1', T2', T3', T4', T5', T6', T7', T8') may protrude outside the second bobbin (B2') in the -x-axis direction.

[0083] The second coil (130', C2') may include a plurality of conductive lines. The plurality of conductive lines may include an inner conductive line and an outer conductive line. The inner conductive line may form a turn centered on the second through hole (CH2), and the outer conductive line may form a turn at the outer edge of the inner conductive line. For example, as illustrated in FIG. 5, the outer conductive line may include two conductive lines (L1', L2') and the inner conductive line may include two conductive lines (L3', L4').

[0084] The two ends, that is, the ends, of the plurality of conductive lines (L1', L2', L3', L4') are each electrically connected to a different one 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).

[0085] The plurality of terminal pins may include inner terminal pins and outer terminal pins. The inner terminal pins may be connected to the ends of the inner conductive lines, and the outer terminal pins may be connected to the ends of the outer conductive lines. For example, as illustrated in FIG. 5, the inner terminal pins may include four terminal pins (T3', T4', T5', T6'), and the outer terminal pins may include four terminal pins (T1', T2', T7', T8').

[0086] For example, both ends of the first conductive line (L1') may be connected to an end (E1) of the first terminal pin (T1') and an end (E8) of the eighth terminal pin (T8'), both ends of the second conductive line (L2') may be connected to an end (E2) of the second terminal pin (T2') and an end (E7) of the seventh terminal pin (T7'), and both ends of the third conductive line (L3') may be connected to an end (E3) of the third terminal pin (T3') and an end (E6) of the sixth terminal pin (T6'), and both ends of the fourth conductive line (L4') may be connected to an end (E4) of the fourth terminal pin (T4') and an end (E5) of the fifth terminal pin (T5').

[0087] In an embodiment, the outer terminal pins may be arranged closer to the core area (CA) or the center portion (CP) in the first direction than the inner terminal pins. For example, referring to FIG. 5, the ends (E1, E2, E7, E8) of the first, second, seventh, and eighth terminal pins (T1', T2', T7', T8') corresponding to the outer terminal pins may be arranged closer to the center portion (CP) in the first direction than the ends (E3, E4, E5, E6) of the third, fourth, fifth, and sixth terminal pins (T3', T4', T5', T6').

[0088] In this way, the arrangement of the outer terminal pin closer to the core area (CA) or the center portion (CP) in the first direction than the inner terminal pin may mean that the end of the outer terminal pin is arranged closer to the core area (CA) or the center portion (CP) in the first direction than the end of the inner terminal pin.

[0089] Referring to FIG. 5, the contact points between the ends of the first to fourth conductive lines (L1', L2', L3', L4') and the ends of the corresponding terminal pins (T1', T2', T3', T4', T5', T6', T7', T8') are illustrated.

[0090] That is, one end of the two ends of the first conductive line (L1') can be connected to the end (E1) of the first terminal pin (T1') at the first contact point (CT1), and the other end of the two ends of the first conductive line (L1') can be connected to the end (E8) of the eighth terminal pin (T8') at the eighth contact point (CT8).

[0091] One end of the two ends of the second conductive wire (L2') can be connected to the end (E2) of the second terminal pin (T2') at the second contact (CT2), and the other end of the two ends of the second conductive wire (L2') can be connected to the end (E7) of the seventh terminal pin (T7') at the seventh contact (CT7).

[0092] One end of the third conductive wire (L3') can be connected to the end (E3) of the third terminal pin (T3') at the third contact (CT3), and the other end of the third conductive wire (L3') can be connected to the end (E6) of the sixth terminal pin (T6') at the sixth contact (CT6).

[0093] One end of the fourth conductive wire (L4') can be connected to the end (E4) of the fourth terminal pin (T4') at the fourth contact (CT4), and the other end of the fourth conductive wire (L4') can be connected to the end (E5) of the fifth terminal pin (T5') at the fifth contact (CT5).

[0094] According to an embodiment, the first, second, seventh and eighth contacts (CT1, CT2, CT7, CT8) may be arranged closer to the central portion (CP) in the first direction than the third, fourth, fifth and sixth contacts (CT3, CT4, CT5, CT6).

[0095] According to an embodiment, the ends (E1, E2, E7, E8) of the outer terminal pins (e.g., T1', T2', T7', T8') are spaced apart from the core area (CA) or the center (CP) in a first direction by a first distance (X1), and the ends (E3, E4, E5, E6) of the inner terminal pins (e.g., T3', T4', T5', T6') are spaced apart from the core area (CA) or the center (CP) in the first direction by a second distance (X2). In this case, the first distance (X1) may be smaller than the second distance (X2).

[0096] Additionally, according to an embodiment, the inner terminal pin and the outer terminal pin may be arranged on different horizontal planes. That is, the second horizontal line (H2') on which the ends (E3, E4, E5, E6) of the inner terminal pins (e.g., T3', T4', T5', T6') are arranged and the first horizontal line (H1') on which the ends (E1, E2, E7, E8) of the outer terminal pins (e.g., T1', T2', T7', T8') are arranged have a step and may not be arranged on the same horizontal plane.

[0097] Additionally, according to an embodiment, the length of the entire turn between the two ends of the outer conductive line (hereinafter referred to as the 'first length') and the length of the entire turn between the two ends of the inner conductive line (hereinafter referred to as the 'second length') may be equal to each other.

[0098] If a plurality of terminal pins (T1', T2', T3', T4', T5', T6', T7', T8') are arranged on the same horizontal line, the outer conductive line turns outside the inner conductive line, so the first length may be greater than the second length. However, according to an embodiment, each end (E1, E2, E7, E8) of the outer terminal pins (T1', T2', T7', or T8') connected to both ends of the outer conductive line (L1' or L2') is arranged closer to the core area (CA) or the center (CP) than each end (E3, E4, E5, E6) of the inner terminal pins (T3', T4', T5', T6') connected to the inner conductive line (L3' or L4'), so the first length and the second length may be equal to each other.

[0099] In addition, in order to make the lengths of the first, second, third and fourth conductive lines (L1', L2', L3', L4') arranged in a direction away from the second through hole (CH2) the same, the distance at which the ends (E1 to E8) of the multiple terminal pins (T1' to T8') are spaced from the core area (CA) or the center portion (CP) may be equal to the following mathematical expression 1 or 2.

[0100]

[0101]

[0102] Here, DL1 means the distance by which the end (E1) of the first terminal pin (T1') is spaced apart from the center (CP) in the first direction, DL2 means the distance by which the end (E2) of the second terminal pin (T2') is spaced apart from the center (CP) in the first direction, DL3 means the distance by which the end (E3) of the third terminal pin (T3') is spaced apart from the center (CP) in the first direction, DL4 means the distance by which the end (E4) of the fourth terminal pin (T4') is spaced apart from the center (CP) in the first direction, DL5 means the distance by which the end (E5) of the fifth terminal pin (T5') is spaced apart from the center (CP) in the first direction, DL6 means the distance by which the end (E6) of the sixth terminal pin (T6') is spaced apart from the center (CP) in the first direction, and DL7 means the distance by which the seventh terminal pin (T7') is spaced apart from the center (CP) in the first direction. DL8 means the distance spaced apart in the first direction from the center part (CP), and DL8 means the distance spaced apart in the first direction from the center part (CP) of the 8th terminal pin (P8').

[0103] In addition, according to an embodiment, the terminals (E1, E2, E7, E8) of the outer terminal pins (e.g., T1', T2', T7', T8') arranged closer to the core portion (110) than the inner terminals may be arranged to be spaced apart from the core area (CA) or the center (CP) in the first direction by a minimum distance. If the terminals (E1, E2, E7, E8) of the outer terminal pins (e.g., T1', T2', T7', T8') are arranged to be in contact with the core area (CA) or the center (CP), the contacts (CT1, CT2, CT7, CT8) may be short-circuited with the core (110). To prevent this, the ends (E1, E2, E7, E8) of the outer terminal pins (e.g., T1', T2', T7', T8') need to be spaced apart from the core (110) by a minimum distance.

[0104] In addition, according to an embodiment, a plurality of conductive lines (e.g., L1', L2', L3', L4') in each of the central portion (CP) and the second outer portion (2P) may be arranged on the same horizontal plane without intersecting and overlapping in the vertical direction. In this case, a plurality of conductive lines (e.g., L1', L2', L3', L4') in each of the central portion (CP) and the second outer portion (2P) may be arranged to be spaced apart from each other at the same interval (t2) in the horizontal direction.

[0105] Hereinafter, a transformer (100A) according to a first comparative example and an embodiment is described as follows with reference to the attached drawings.

[0106] Figure 6 shows a plan view of a transformer according to the first comparative example.

[0107] The transformer according to the first comparative example illustrated in Fig. 6 includes a second bobbin (B21) and a second coil (C21). The second bobbin (B21) includes a central portion (CP1), first and second outer portions (1P1, 2P1) and a plurality of terminal pins (T11 to T81), and the second coil (C21) includes a plurality of conductive lines (L11, L21, L31, L41). Here, the second coil (C21), the second bobbin (B21), the second through hole (CH21), the central portion (CP1), the first and second outer portions (1P1, 2P1), the terminal pins (T11 to T81) and the plurality of conductive lines (L11, L21, L31, L41) perform the same functions as the second coil (C2), the second bobbin (B2), the second through hole (CH2), the central portion (CP), the first and second outer portions (1P, 2P), the terminal pins (T1 to T8) and the plurality of conductive lines (L1, L2, L3, L4) according to one embodiment, so that a duplicate description is omitted.

[0108] In the case of the transformer according to the first comparative example, the first to fourth conductive lines (L11, L21, L31, L41) in the second outer portion (2P1) are arranged to overlap each other in the third direction, which is the vertical direction, whereas in the central portion (CP1), the outer conductive lines (L11, L21) and the inner conductive lines (L31, L41) intersect and do not overlap but are arranged on the same horizontal plane. Except for this, the transformer according to the first comparative example illustrated in FIG. 6 is the same as the transformer (100A) according to one embodiment, so redundant description is omitted.

[0109] In the case of the transformer according to the first comparative example, the second coil (C21), which is the secondary wire, is wound horizontally with the first coil (C1), which is the primary wire, to implement leakage inductance during winding. In this case, the current concentration phenomenon and heat generation may increase depending on the position of the conductive lines (L11 to L41) of the second coil (C21) arranged. To solve this, as illustrated in Fig. 6, the first to fourth conductive lines (L11, L21, L31, L41) are arranged to cross each other in the third direction and vertically overlap each other in the second outer portion (2P1). In this case, by adjusting the lengths of the conductive lines to be constant, the resistance deviation of the conductive lines can be reduced and the current concentration can be improved. However, the current concentration phenomenon may be more significantly expressed during high-frequency operation. That is, when looking left and right with the core as the center, one side of the conductive line is located outside the core and the other side is located toward the center of the core, and the higher the frequency within the conductive line at the center of the core, the more the current concentration can be biased.

[0110] On the other hand, according to one embodiment, the point where the plurality of conductive lines intersect is located in the core area (CA) on the inside of the core (110) instead of the second outer portion (2P) on the outside of the core (110). In this way, by intersecting the outer conductive lines (L1, L2) and the inner conductive lines (L3, L4) at least on one side (S1) or the other side (S2) of the core area (CA) or the central portion (CP) per turn, the current imbalance deviation can be minimized even at high frequencies.

[0111] Hereinafter, a transformer (100B) according to a second comparative example and other embodiments will be described with reference to the attached drawings.

[0112] Figure 7 shows a plan view of a transformer according to the second comparative example.

[0113] The transformer according to the second comparative example illustrated in Fig. 7 includes a second bobbin (B22) and a second coil (C22). The second bobbin (B22) includes a central portion (CP2), first and second outer portions (1P2, 2P2), and a plurality of terminal pins (T12 to T82), and the second coil (C22) includes a plurality of conductive lines (L12, L22, L32, L42). Here, the second coil (C22), the second bobbin (B22), the second through hole (CH22), the central portion (CP2), the first and second outer portions (1P2, 2P2), the terminal pins (T12 to T82), and the plurality of conductive lines (L12, L22, L32, L42) perform the same functions as the second coil (C2'), the second bobbin (B2'), the second through hole (CH2), the central portion (CP), the first and second outer portions (1P, 2P), the terminal pins (T1' to T8'), and the plurality of conductive lines (L1', L2', L3', L4') according to another embodiment, so that a duplicate description is omitted.

[0114] In the case of the transformer according to the second comparative example, the first to fourth conductive lines (L12, L22, L32, L42) in the second outer portion (2P2) are arranged to overlap each other in the third direction, which is the vertical direction, and the ends of the plurality of terminal pins (T12 to T82) and the contact points (CT11 to CT81) connecting the ends of the conductive lines (L12 to L42) are arranged on the same horizontal line (H3). Except for this, the transformer according to the second comparative example illustrated in FIG. 7 is the same as the transformer (100B) according to other embodiments.

[0115] In the case of the transformer according to the second comparative example, in order to reduce the current concentration phenomenon and the direct current (DC) resistance (DCR) deviation of the second coil (C22) corresponding to the secondary wire, as illustrated in Fig. 7, the first to fourth conductive lines (L12, L22, L32, L42) are arranged to overlap and cross each other in the third direction. In this case, although the resistance deviation of the conductive lines can be reduced and the current concentration can be improved by adjusting the length of the conductive lines to a constant level, the manufacturing cost and unit price of the transformer can be increased because the manufacturing is difficult.

[0116] In addition, in the low-frequency region or DCDC operation section rather than the high-frequency region, the effect of the current concentration phenomenon of the winding is reduced, and the heat generation performance deviation due to DCR may increase. In this way, a simple structure is required to match only the resistance of the winding. Considering this, according to the second embodiment, the contact point between the outer conductive line and the end of the terminal pin is arranged closer to the core than the contact point between the inner conductive line and the end of the terminal pin, so that the second length of the inner conductive line can be relatively increased compared to the first length of the outer conductive line, so that the first length and the second length can be made the same. Ultimately, due to this, the DC resistance difference between the inner conductive line and the outer conductive line can be minimized, so that the DCR deviation can be minimized during low-frequency operation. In addition, unlike the second comparative example, the conductive lines (L1' to L4') in the second outer portion (2P) cross vertically and do not overlap, so that the manufacturing process can be simplified, which can reduce the unit cost of the components.

[0117] 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.

[0118] The mode for carrying out the invention has been sufficiently described in the above-mentioned “Best mode for carrying out the invention.”

[0119] The transformer according to the embodiment can be used in a power supply device of an electronic device, etc.

Claims

1. First core; A second core disposed on the first core; A bobbin having a through hole formed therein and at least a portion of which is disposed in a core region between the first core and the second core; and At least a portion of the coil portion is disposed on the bobbin and includes a plurality of conductive lines, The above bobbin A central portion in which the above through hole is formed and vertically overlaps the core region; A first outer portion and a second outer portion located on opposite sides in the first direction with the central portion interposed therebetween; and A plurality of terminal pins are disposed on the first outer portion and each of the plurality of conductive lines has different ends connected to each other, The above multiple challenge lines are An inner conductive line forming a turn centered on the above through hole; and Including an outer conductive line forming a turn on the outer side of the inner conductive line, The above multiple terminal pins an inner terminal pin connected to the end of the inner conductive wire; and Includes an outer terminal pin connected to the end of the outer conductive wire, A transformer wherein the outer terminal pin is arranged closer to the core area in the first direction than the inner terminal pin.

2. In paragraph 1, The outer terminal pin is spaced apart from the core region by a first distance in the first direction, The inner terminal pin is spaced apart from the core region by a second distance in the first direction, A transformer in which the first distance is smaller than the second distance.

3. In paragraph 1, A transformer in which the inner terminal pin and the outer terminal pin are arranged on different horizontal planes.

4. In paragraph 1, A transformer in which the plurality of conductive lines in each of the central portion and the second outer portion are arranged on the same horizontal plane without intersecting or overlapping.

5. In paragraph 4, A transformer in which the plurality of conductive lines are arranged at equal intervals in the horizontal direction in each of the central portion and the second outer portion.

6. In paragraph 1, A transformer in which the first length of the entire turn between the two ends of the inner conductive line and the second length of the entire turn between the two ends of the outer conductive line are equal to each other.

7. In paragraph 1, A transformer in which the outer terminal pin is positioned at a minimum distance from the core region in the first direction.

8. In paragraph 1, The above coil part A first coil arranged to form a turn centered on the above through hole; and A transformer comprising a second coil formed by forming turns on the outer surface of the first coil and including the plurality of conductive lines.

9. 1st core; A second core disposed on the first core; A bobbin having a through hole formed therein and at least a portion of which is disposed in a core region between the first core and the second core; and At least a portion of the coil portion is disposed on the bobbin and includes a plurality of conductive lines, The above bobbin A central portion in which the above through hole is formed and overlaps the core region in a third direction; and Including a first outer portion and a second outer portion located on opposite sides in a first direction intersecting the third direction with the central portion interposed therebetween, A transformer in which the plurality of conductive lines arranged in the central portion overlap and intersect along the third direction.

10. In paragraph 9, The above coil part A first coil arranged to form a turn centered on the above through hole; and A transformer comprising a second coil formed by forming turns on the outer surface of the first coil and including the plurality of conductive lines.

Images