KR102735191B1 - Magnetic component and display device having the same - Google Patents

Abstract

A transformer according to one embodiment of the present invention comprises a core portion and a first coil portion and a second coil portion at least partially accommodated within the core portion, wherein at least one of the first coil portion and the second coil portion can reduce an inductance deviation between the conductive lines by allowing a plurality of conductive lines to intersect each other in a specific region.

Description

{MAGNETIC COMPONENT AND DISPLAY DEVICE HAVING THE SAME}

The present invention relates to a magnetic element capable of reducing heat generation due to inductance deviation according to the configuration of a coil, and an image output device including the same.

Power supplies for electronic devices contain various magnetic coupling devices, such as transformers and line filters, and coil components.

Transformers can be included in electronic devices for various purposes. For example, transformers can be used to perform an energy transfer function that transfers energy from one circuit to another. Transformers can also be used to perform a step-up or step-down function that changes the size of a voltage. In addition, transformers, which have the characteristic of only inductive coupling between the primary and secondary windings and thus no direct DC path is formed, can be used for the purpose of blocking direct current and passing alternating current, or for insulating and separating two circuits.

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

Referring to Fig. 1, a typical slim-type transformer (10) includes a core section 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) usually 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).

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.

However, when applying conductive lines to the secondary coil, they must be arranged side by side on a plane for slimming purposes, so 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 can cause severe heat generation again, which is a problem.

The technical problem to be achieved by the present invention is to provide a slim transformer capable of reducing heat generation and a circuit board using the transformer.

In particular, the present invention provides a transformer capable of preventing heat generation due to inductance deviation caused by a difference in the length of a coil composed of a conductive wire, and a circuit board using the same.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

According to one embodiment, a magnetic coupling device comprises: a first core; a second core disposed on the first core; a bobbin having a through hole formed in a central portion and at least a portion disposed between the first core and the second core; a first coil portion and a second coil portion having at least a portion disposed on the bobbin; wherein one of the first coil portion and the second coil portion comprises a first conductive line and a second conductive line disposed along a periphery of the through hole and each having a first end and a second end, the bobbin comprises a terminal portion having a first end and a second end of the first conductive line and a first end and a second end of the second conductive line disposed; and a plating portion facing the terminal portion with the through hole interposed therebetween in a horizontal direction, wherein a portion of the first conductive line and a portion of the second conductive line can vertically overlap on the plating portion.

For example, the second coil portion may be placed inside the first coil portion.

For example, the first coil portion and the second coil portion may overlap along one direction.

For example, the first coil portion may be provided with the first conductive line and the second conductive line, and the second coil portion may be provided with a metal plate.

For example, either one of the first coil portion and the second coil portion may further include a third conductive line and a fourth conductive line arranged along the periphery of the through hole and each including a first end and a second end.

For example, a portion of the third challenge line may vertically overlap a portion of the fourth challenge line.

For example, the first challenge line includes a tab that vertically overlaps with a tab of the fourth challenge line, and a part of the first challenge line and the tab of the first challenge line can be arranged at different positions.

For example, the second challenge line includes a tab that vertically overlaps with a tab of the third challenge line, and a part of the second challenge line and the tab of the second challenge line can be arranged at different positions.

For example, a first end of the third conductive line, a first end of the first conductive line, a first end of the fourth conductive line, a first end of the second conductive line, a second end of the first conductive line, a second end of the third conductive line, a second end of the second conductive line, and a second end of the fourth conductive line can be arranged in parallel on the terminal portion.

For example, a first end of the fourth conductive line, a first end of the second conductive line, a second end of the first conductive line, and a second end of the third conductive line may form a first terminal portion that is electrically short-circuited with each other.

For example, the first end of the third conductive line and the first end of the first conductive line may form a second terminal portion that is electrically short-circuited to each other, and the second end of the second conductive line and the second end of the fourth conductive line may form a third terminal portion that is electrically short-circuited to each other.

For example, the first terminal portion may be grounded, and the second terminal portion and the third terminal portion may be connected with electrically different polarities from each other.

For example, the first core may include a first protrusion protruding toward the second core, and the first protrusion may be positioned inside the through hole of the bobbin.

For example, the second coil portion may be positioned between the first protrusion and the first coil portion.

In addition, according to one embodiment, an image output device includes: a case; a power supply unit (PSU) disposed within the case and including a magnetic coupling device; and a display disposed on one side of the case for outputting a received signal as an image; wherein the magnetic coupling device disposed in the power supply unit (PSU) includes: a first core; a second core disposed on the first core; a bobbin having a through hole formed in a central portion and at least a portion of which is disposed between the first core and the second core; a first coil portion and a second coil portion, at least a portion of which is disposed on the bobbin; wherein one of the first coil portion and the second coil portion includes a first conductive line and a second conductive line disposed along a periphery of the through hole and each of which includes a first end and a second end, and wherein the bobbin includes a terminal portion on which a first end and a second end of the first conductive line and a first end and a second end of the second conductive line are disposed; And the terminal portion includes a contact portion facing the through hole in a horizontal direction, a part of the first conductive line and a part of the second conductive line vertically overlap on the contact portion, and the first and second ends of the first conductive line and the first and second ends of the second conductive line arranged on the terminal portion can supply power to the display.

The transformer according to the embodiment can minimize the difference in length of the conductive lines by allowing a plurality of conductive lines constituting the coil to intersect each other in one area.

Additionally, heat generation is reduced by improving the inductance deviation between the conductive lines forming the same turn in parallel through short-circuiting of the terminal pins.

In addition, slimming is possible because the bobbin has an opening in the area where the crossing between the challenge lines occurs.

The effects that can be obtained from the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art to which the present invention belongs from the description below.

Figure 1 is an exploded perspective view showing an example of a typical slim-type transformer configuration.
FIG. 2a is a plan view of a transformer according to one embodiment.
FIG. 2b is a plan view showing a transformer with the core portion removed according to one embodiment.
FIG. 2c is a cross-sectional view showing a transformer according to one embodiment taken along line A-A' of FIG. 2a.
FIG. 3 is a plan view showing an example of a second coil section configuration according to one embodiment.
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.
Fig. 5 is a plan view showing an example of a second coil section configuration according to a comparative example.
Figure 6 shows the current deviation of a transformer according to one embodiment and a transformer according to a comparative example.
Fig. 7 shows an example of a heat distribution shape of a transformer according to one embodiment and a transformer according to a comparative example.
Fig. 8 is a plan view showing an example of a second coil section configuration according to another embodiment.
FIG. 9 shows an example of a heat distribution shape of a transformer according to one embodiment and a transformer according to another embodiment.
FIG. 10 is a drawing for explaining a form in which overlap occurs between conductive lines in a second section of a second coil section according to one embodiment.
FIG. 11a shows an example of a plan view of a second coil portion according to another embodiment, FIG. 11b shows a side view of the second coil portion illustrated in FIG. 11a, and FIG. 11c shows another example of a plan view of the second coil portion according to another embodiment.

The present invention can have various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. However, this is not intended to limit the present invention to specific embodiments, but should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention.

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

When it is said that a component is "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 in between. On the other hand, when it is said that a component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

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 via another layer. The reference to "on" or "under" each layer is described with reference to 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.

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 "comprises" or "has" and the like are intended to specify 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.

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 belongs. Terms defined in commonly used dictionaries, such as those defined in common dictionaries, should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant art, and will not be interpreted in an idealized or overly formal sense unless expressly defined in this application.

Hereinafter, a transformer will be assumed as an example of a magnetic coupling device according to the present embodiment and described in detail with reference to the attached drawings.

FIG. 2a is a plan view of a transformer according to one embodiment, FIG. 2b is a plan view showing a form of a transformer with a core portion removed according to one embodiment, and FIG. 2c is a cross-sectional view showing a cross-section taken along line A-A' of FIG. 2a of a transformer according to one embodiment.

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). Hereinafter, each component will be described in detail.

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) can 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) can have shapes that are symmetrical to each other vertically or can have asymmetric shapes. However, in the description below, it is assumed that they have shapes that are symmetrical to each other vertically for the convenience of explanation. In addition, the lower core (112) can be referred to as a 'first core' and the upper core (111) can be referred to as a 'second core', respectively.

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 plurality of leg portions that protrude in the thickness direction (i.e., in the triaxial direction) from the body portion and extend along a predetermined direction. The plurality of leg portions may include two outer legs that extend along one axis (here, the 1st axis) on a plane and are spaced apart from each other along the other axis (here, the 2nd axis) direction, and one middle leg (CL) that is arranged between the two outer legs. For example, the leg portion of the first core (112) protrudes toward the second core (111) and thus may be referred to as a 'first protrusion portion', and the leg portion of the second core (111) protrudes toward the first core (112) and thus may be referred to as a 'second protrusion portion'.

When the upper core (111) and the lower core (112) are connected vertically, each of the outer and middle legs of the upper core (111) faces the corresponding outer or middle legs of the lower 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.

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

The first coil portion (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 an accommodation space of the first bobbin.

The second coil part (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 on the second through-hole (CH2) within the receiving space of the second bobbin (B2). Here, at least a portion of the first coil part (120) may be arranged in the second through-hole (CH2). Accordingly, the first coil part (120) and the second coil part (130) may at least a portion overlap along a horizontal direction. Here, the horizontal direction may be the first axial direction and/or the second axial direction disclosed in FIG. 3. And, the vertical direction means a direction perpendicular to the horizontal direction, and may be the third axial direction disclosed in FIG. 3. Additionally, 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).

The first coil (C1) and the second coil (C2) may be multiple windings in which a rigid conductor metal, for example, a copper conductor wire, is wound several times in a spiral or flat spiral shape, but is not necessarily limited thereto. For example, the first coil (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.

According to an embodiment, the first coil part (120) may correspond to a primary coil of the transformer (100), and the second coil part (130) may correspond to a secondary 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 three-axis direction, but is not necessarily limited thereto. Here, the height may mean the length in the third-axis direction, and the height direction may have the same meaning as the thickness direction, the third-axis direction, and the vertical direction.

Additionally, one of the first coil portion (120) and the second coil portion (130) may be provided with a plurality of conductive lines, and the other may be provided with a metal plate.

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

FIG. 3 is a plan view showing 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 shown with the upper plate (TP) removed.

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

The second bobbin (B2) may include a central portion (CP), a first portion (1P) positioned on one side in the uniaxial direction from the central portion (CP) or the second through hole (CH2), and a second portion (2P) positioned on the other side opposite to the first portion (1P) in the uniaxial direction from the central portion (CP) or the second through hole (CH2).

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 parallel manner along a two-axis direction in the first portion (1P). Accordingly, the first portion (1P) may be referred to as a 'terminal portion' due to the arrangement of terminal pins.

The second coil (C2) may include multiple conductive lines (L1, L2, L3, L4).

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), respectively, and 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 in the transformer can be suppressed by lowering the heat generation due to the resistance.

For example, both ends of the first conductive line (L1) may be connected to the second terminal pin (T2) and the fifth terminal pin (T5), and both ends of the third conductive line (L3) may be connected to the first terminal pin (T1) and the sixth terminal pin (T6), respectively. In addition, both ends of the second conductive line (L2) may be connected to the fourth terminal pin (T4) and the seventh terminal pin (T7), respectively, and both ends of the fourth conductive line (L4) may be connected to the third terminal pin (T3) and the eighth terminal pin (T8), respectively.

Meanwhile, the first conductive line (L1) and the third conductive line (L3) may intersect with the second conductive line (L2) and the fourth conductive line (L4) so that at least some of them overlap along the three-axis direction in the second portion (2P). In addition, the plurality of conductive lines (L1, L2, L3, L4) may be arranged parallel to each other along the two-axis direction in the central portion (CP) and may extend along the one-axis direction. In Fig. 3, the plurality of conductive lines (L1, L2, L3, L4) are illustrated as not overlapping each other along the three-axis direction in the central portion (CP), but some overlap may occur in the three-axis direction in the area adjacent to the second portion (2P). That is, one side of each of the plurality of conductive lines (L1, L2, L3, L4) may be extended so as to be arranged on the second portion (2P), and the other side may be extended so that both ends are arranged on the first portion (1P).

Due to the configuration of the second coil section (130) described above, there is a part where the conductive wires constituting the second coil (C2) overlap in the second section (2P), etc., but from the perspective of each conductive wire, since only one turn is formed, the second coil (C2) can be viewed as being wound in one layer. Due to the occurrence of overlap between the conductive wires, the second section (2P) can be referred to as a 'deposition section'.

This terminal pin connection state and the crossing in the second part (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.

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.

Referring to FIGS. 4A and 4B, the first conductive line (L1) and the third conductive line (L3) are connected in parallel to form a first turn portion (NS2) for a first signal of the secondary coil of the transformer, and the second conductive line (L2) and the fourth conductive line (L4) form a second turn portion (NS3) for a second 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 first signal, and the fifth terminal pin (T5) and the sixth terminal pin (T6) correspond to grounds for the first signal. In addition, the seventh terminal pin (T7) and the eighth terminal pin (T8) correspond to input terminals for the second signal, and the fourth terminal pin (T4) and the third terminal pin (T3) correspond to grounds for the second signal. Here, the grounds of each signal can be electrically connected to each other to form a so-called Center Tap (CT) structure. That is, the third terminal pin (T3), the fourth terminal pin (T4), the fifth terminal pin (T5), and the sixth terminal pin (T6) can be electrically short-circuited. Here, different signals may also mean different electrical polarities.

Returning to FIG. 3 again, due to the connection between the conductive lines and the terminal pins described above, the first conductive line (L1) and the third conductive line (L3) constituting the first turn portion (NS2) in parallel have a mirror image (symmetrical) shape on a plane along the 1-axis direction with respect to the second conductive line (L2) and the fourth conductive line (L4) constituting the second turn portion (NS3) in parallel and the second through hole (CH2). Accordingly, since the first turn portion (NS2) and the second turn portion (NS3) have substantially the same conductive line configuration, the impedance deviation or inductance deviation due to the difference in the lengths of the conductive lines is minimized, and thereby heat generation due to current concentration can be reduced. Here, the first turn portion (NS2) and the second turn portion (NS3) having substantially the same conductive line configuration may mean the length and/or thickness. In addition, the meaning of being identical may not necessarily mean being completely identical. That is, it can mean that the deviation in length or thickness is within 1 to 10%, and this difference can be narrowed depending on the process. That is, it can mean that the deviation in length is within 10%, and it can mean that the deviation in the thickness of the conductive wire is within 10%. However, if the deviation is greater than 10%, it can cause impedance deviation or inductance deviation, and it can be difficult to improve heat generation due to current concentration. That is, it is recommended to have a conductive wire so that the deviation is 10% or less, and ideally, it is recommended to have a conductive wire so that it is 0%. However, in reality, there can be a difference in the length or thickness of the conductive wire depending on the process, and it is recommended to have a conductive wire so that this difference is 10% or less.

The effect of the configuration of the second coil portion (130A) described above will be explained in more detail through comparison with comparative examples with reference to FIGS. 5 to 7.

Fig. 5 is a plan view showing an example of a second coil section configuration according to a comparative example.

Referring to FIG. 5, the second coil portion (130') according to the comparative example has the same configuration of the second bobbin (B2) as in the first embodiment, but the plurality of conductive lines (L1, L2, L3, L4) are parallel to each other and do not intersect each other so that at least some of them overlap in the three-axis direction in the second portion (2P). In this case, the first conductive line (L1') forms a turn at the innermost side and thus has the shortest length, and the fourth conductive line (L4') forms a turn at the outermost side and thus has the longest length.

Figure 6 shows the current deviation of a transformer according to one embodiment and a transformer according to a comparative example.

Referring to FIG. 6, graphs are shown at the top and bottom, respectively, and in each graph, the vertical axis commonly represents current and the horizontal axis commonly represents time. In addition, the upper graph represents the root mean square (rms) current of each turn section in the second coil section (130A) according to one embodiment, and the lower graph represents the root mean square (rms) current of each turn section in the second coil section (130') according to a comparative example.

First, as shown in the upper graph, the second coil portion (130A) according to one embodiment has substantially the same conductive line configuration between turns, so the current difference between the first turn portion (NS2) and the second turn portion (NS3) is only 0.39 A.

In contrast, as shown in the upper graph, the second coil part (130') according to the comparative example has a different conductive line configuration between the turns, so the current difference between the first turn part (NS2) and the second turn part (NS3) reached 1.56 A.

This current drift causes differences in heat generation, which is explained with reference to Fig. 7.

Fig. 7 shows an example of a heat distribution shape of a transformer according to one embodiment and a transformer according to a comparative example.

Referring to FIG. 7, the upper image is a thermal imaging camera image captured during the operation of a transformer to which a second coil section (130A) according to one embodiment is applied. It can be seen that the temperature in the area (610) corresponding to the first section (1P) is relatively uniform, and the maximum temperature was measured to be approximately 68 degrees.

The lower image shows a transformer to which a second coil section (130') is applied according to a comparative example. It can be seen that the current is concentrated in a specific area (620), heat generation is biased, and the maximum temperature is 70.7 degrees, which is higher than that of the example.

The transformer according to one embodiment described so far has the effect of reducing inductance deviation because each of the conductive lines constituting the second coil (C2) of the second coil section (130) has a symmetrical shape for each signal. However, as shown in FIG. 3, even for turn sections corresponding to the same signal, the lengths of each conductive line connected in parallel are different. For example, in the case of the first conductive line (L1) and the third conductive line (L3) constituting the first turn section (NS2), the first conductive line (L1) is located inside the third conductive line (L3), so it is relatively short. Therefore, in order to minimize such conductive line deviation, another embodiment of the present invention proposes to reduce the deviation of the input inductance generated at the terminal pins within the transformer by short-circuiting the terminal pins with each other. The configuration of the second coil section for this purpose will be described with reference to FIG. 8.

Fig. 8 is a plan view showing an example of a second coil section configuration according to another embodiment.

The configuration of the second coil part (130B) according to another embodiment illustrated in Fig. 8 is identical to the configuration of the second coil part (130A) according to one embodiment except for the short circuit parts (SP1, SPC, SP2), so redundant description will be omitted.

Referring to FIG. 8, the first terminal pin (T1) and the second terminal pin (T2) corresponding to the input terminal of the first signal can be short-circuited through the first short-circuit part (SP1). In addition, the seventh terminal pin (T7) and the eighth terminal pin (T8) corresponding to the input terminal of the second signal can be short-circuited through the second short-circuit part (SP2). In addition, the third to sixth terminal pins (T3, T4, T5, T6) corresponding to the ground of the center-tap configuration can be short-circuited through the center short-circuit part (SPC).

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 conductor clip, a conductor pin, or a combination of these and soldering.

In FIG. 8, the center short circuit (SPC) is illustrated as being configured as an integral part to short circuit all of the third to sixth terminal pins (T3, T4, T5, and T6). However, according to another aspect, the center short circuit (SPC) may be configured with a first center short circuit (not shown) that short circuits the third terminal pin (T3) and the fourth terminal pin (T4), and a second center short circuit (not shown) that short circuits the fifth terminal pin (T5) and the sixth terminal pin (T6). In this case, the first center short circuit (not shown) and the second center short circuit (not shown) may not be physically connected within the transformer. Here, not being physically connected means that the first center short circuit (not shown) and the second center short circuit (not shown) are not directly connected, and does not mean that they are not electrically connected via another connecting member.

The effect of the second coil portion (130B) according to another embodiment is explained with reference to FIG. 9.

FIG. 9 shows an example of a heat distribution shape of a transformer according to one embodiment and a transformer according to another embodiment.

Referring to FIG. 9, the upper image is a thermal imaging camera image captured during the operation of a transformer to which a second coil portion (130A) according to one embodiment is applied. It can be seen that each terminal corresponding to the center tap is not short-circuited, so heat is relatively concentrated in the vicinity of the center tap (910).

The lower image shows a transformer to which a second coil section (130B) according to another embodiment is applied, and it can be seen that heat generation is improved even near the center tap (920). In particular, the temperature is measured at a maximum of 69 degrees in the upper image, but it can be seen that the heat generation is reduced by about 5.5 degrees to a maximum of 63.5 degrees in the lower image.

The experimental results for inductance are shown in Table 1 below.

division In Part 2 Cross In Part 2 No intersection Challenge line 2nd Ls [ uH] Challenge line 2nd Ls [ uH] Paragraph
doesn't exist L3 2.78 L3 2.81 L1 2.71 L1 2.62 △ 0.07 △ 0.19 L4 2.78 L4 2.74 L2 2.71 L2 2.6 △ 0.07 △ 0.14 Section 1 Center Paragraph &
2nd Center Paragraph L3 2.71 L3 2.65 L1 2.7 L1 2.62 △ 0.01 △ 0.03 L4 2.71 L4 2.66 L2 2.71 L2 2.64 △ 0 △ 0.02 Integrated center section L3 2.71 L3 2.64 L1 2.7 L1 2.62 △ 0.01 △ 0.02 L4 2.71 L4 2.66 L2 2.71 L2 2.65 △ 0 △ 0.01

The experiment, the results of which are shown in Table 1, was performed for a total of six cases depending on whether there was a crossing between the conductive lines in the second part (2P) of the second bobbin (B2) and the configuration of the short circuit, and the measurement values were measured by measuring the inductance of each conductive line (L1 to L4).

That is, in the classification of Table 1, "crossing in the second part" means a configuration in which crossing occurs between conductive lines in the second part (2P) of the second bobbin (B2), as in FIG. 3 or FIG. 8, and "no crossing in the second part" may mean a configuration as in FIG. 5. Here, "crossing" may mean vertically overlapping. "Crossing in the second part" may mean vertically overlapping in the electrodeposition portion. According to one embodiment, the conductive lines do not vertically overlap in the terminal portion, but may vertically overlap in the electrodeposition portion. That is, by arranging a plurality of conductive lines so that their lengths and/or thicknesses are ideally the same, and thus arranging them to be misaligned as in FIG. 8, a structure can be formed in which the ends of each conductive line are arranged side by side in the terminal portion. Accordingly, current concentration, inductance deviation, impedance deviation, and heat generation can be reduced.

In addition, "no paragraph" means a configuration without a paragraph, such as in FIG. 3 or FIG. 5, and "integrated center paragraph" means a paragraph configuration, such as in FIG. 8. In addition, "first center paragraph & second center paragraph" means a configuration in which, in the configuration of FIG. 8, the center paragraph (SPC) is not integral, but is separated into a first center paragraph (not shown) that short-circuits the third terminal pin (T3) and the fourth terminal pin (T4), and a second center paragraph (not shown) that short-circuits the fifth terminal pin (T5) and the sixth terminal pin (T6).

Referring to Table 1, regardless of the presence or absence of a short circuit, the "crossing in Part 2" cases show smaller inductance deviations than the "no crossing in Part 2" cases, indicating that reducing the length deviation between conductive lines through crossing between conductive lines in Part 2 is effective in resolving the inductance deviation.

In addition, when a short circuit exists, the inductance deviation is significantly lower than when a short circuit does not exist, and in the case of a center short circuit, it can be seen that the integrated case shows slightly better performance than the configuration with separate first and second center short circuits.

Meanwhile, since the crossing of the conductive lines occurs in the second part (2P) of the second bobbin (B2), the three-axis overlapping between the conductive lines may occur. Therefore, the height of the side wall part (SW) of the second bobbin (B2) must be secured to be at least twice the thickness of the conductive lines to prevent deformation of the second bobbin (B2) in the second part (2P). However, due to securing the height of the side wall part (SW), the second bobbin (B2) becomes thicker overall, which may increase the thickness of the entire transformer. Here, the direction defining the height and thickness may mean the vertical direction or the third-axis direction. This will be described with reference to FIG. 10.

Fig. 10 is a drawing for explaining a form in which overlap occurs between conductive lines in the second section of the second coil section according to one embodiment. In Fig. 10, conductive lines (L1, L2, L3, L4) are expressed as solid lines regardless of overlap to aid understanding.

Referring to FIG. 10, in the second part (2P) of the second coil portion, a plurality of overlapping regions are formed according to the overlapping combination pairs between the plurality of conductive lines. For example, in the second part (2P), a first region (A1) in which a third conductive line (L3) and a fourth conductive line (L4) vertically overlap on a plane, a second region (A2) in which the first conductive line (L1) and the fourth conductive line (L4) vertically overlap on a plane, a third region (A3) in which the second conductive line (L2) and the third conductive line (L3) vertically overlap on a plane, and a fourth region (A4) in which the first conductive line and the second conductive line vertically overlap on a plane are formed. The above-described first region (A1) to fourth region (A4) may be spaced apart from each other along a horizontal direction. The horizontal direction may mean a first axial direction and/or a second axial direction, and the vertical direction may mean a third axial direction, a height direction, or a thickness direction perpendicular thereto.

These areas (A1, A2, A3, A4) require a larger accommodation space in the three-axis directions compared to the remaining areas.

Therefore, in another embodiment of the present invention, it is proposed to prevent an increase in the thickness of the second bobbin by forming an opening in at least one of the upper plate (TP) and the lower plate (BP) in an area corresponding to the second part (2P) of the second bobbin (B2).

FIG. 11a shows an example of a plan view of a second coil unit according to another embodiment, FIG. 11b shows a side view of the second coil unit illustrated in FIG. 11a as viewed in the direction of the arrow at the top of FIG. 11a, and FIG. 11c shows another example of a plan view of the second coil unit according to another embodiment.

Referring to FIGS. 11A and 11B together, in a second coil portion (130C) according to another embodiment, openings (OP1_T, OP1_B) having a semicircular plane shape are formed in each of the upper plate (TP_A) and the lower plate (BP_A) of the second bobbin. Due to the presence of these openings (OP1_T, OP1_B), even if the height (h2) of the receiving space (i.e., the height of the side wall portion (SW)) is less than twice the diameter (D) of the conductive wires, as illustrated in FIG. 11B, a space for the conductive wires to intersect can be secured without deformation of the bobbin. Accordingly, an increase in the thickness of the second bobbin can be prevented.

Meanwhile, the maximum length (h1) of the openings (OP1_T, OP1_B) in the 1-axis direction is preferably greater than twice the diameter (2*D) of each conductive line, as illustrated in FIG. 10. In addition, it is preferred that the positions of the openings (OP1_T, OP1_B) include at least a portion of each of the four regions (A1, A2, A3, A4) where overlapping occurs between the conductive lines in FIG. 10. In addition, it is preferred that the planar area of the openings (OP1_T, OP1_B) is 50% to 90% of the sum of the areas of the four regions (A1, A2, A3, A4) where overlapping occurs between the conductive lines, but is not necessarily limited thereto.

In addition, although the planar shape of the opening (OP1_T, OP1_B) is illustrated as a semicircle in Fig. 11a, this is exemplary and is not limited to a circle, track shape, polygon, etc., as long as it can include at least a portion of each of the four regions (A1, A2, A3, A4) where overlap between the conductive lines occurs. For example, as illustrated in Fig. 11c, the opening (OP2_T, OP2_B) of the second coil portion (130D) may have a triangular planar shape.

The transformer according to the embodiments described so far has been described assuming that the second coil part (130, 130A, 130B, 130C, 130D) corresponds to the secondary coil of the transformer, but the configuration for reducing the inductance deviation applied to the second coil part (130, 130A, 130B, 130C, 130D) may be applied to the first coil part (120) or both the first and second coil parts.

In addition, as described above, the transformer (100) according to the embodiment may form a circuit board (not shown) that constitutes a power supply unit (PSU) or the like together with other magnetic elements (e.g., an inductor).

When a magnetic coupling device having the characteristics of the invention described above is used in IT devices such as smartphones, server computers, image output devices (e.g., TVs), vehicles, home appliances, and vehicles, it can have a slim thickness and stably perform a power conversion function. When using an existing magnetic coupling device, for example, a transformer, it is difficult to make the volume of a home appliance or IT device thin, and if it is simply manufactured thin, it may have problems such as leakage inductance, leakage current, or greatly reduced power conversion efficiency. However, a magnetic coupling device having the characteristics of the invention described above can configure a power supply unit (PSU) to have a thin thickness and/or a small area, for example, and can solve problems such as reduced power conversion efficiency, leakage current, and leakage inductance that may occur accordingly. Therefore, power can be smoothly supplied to each component within the entire product, so that heat generation is low, power conversion efficiency is high, and leakage current or leakage inductance problems can be solved. For example, when a power supply unit (PSU) composed of a magnetic coupling device having the features of the present invention described above is applied to an image output device (e.g., a TV), a low-power image output device (e.g., a TV) with low power consumption can be provided to consumers in a thinner form, which can serve as a driving force for consumers to purchase the image output device (e.g., a TV) to which the magnetic coupling device having the features of the present invention is applied. The image output device (e.g., a TV) described above can include a display and a power supply unit (PSU) in a case. It can be applied as a transformer for converting power to be applied to the display, or it can be applied for high frequency to reduce power consumption. That is, a display, a power supply unit (PSU), and a signal receiving device can be connected in a case of the image output device (e.g., a TV) by the magnetic coupling device having the features of the present invention, so that a thin image output device (e.g., a TV) can operate stably without a heat generation problem, thereby achieving functional integration or technical interoperability.

In addition, when used in IT devices, home appliances, or vehicles, the entire product can be manufactured in a smaller volume, and the product can maintain stable function, thereby enabling the entire product and the magnetic coupling device to which the present invention is applied to achieve functional integration or technical interconnection with each other.

Although the above has been described with reference to embodiments, these are merely examples and do not limit the present invention. Those skilled in the art to which the present invention pertains will recognize 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, the differences related to such modifications and applications should be interpreted as being included in the scope of the present invention defined in the appended claims.

100: Transformer 111, 112: Core
120: 1st coil
130, 130A, 130B, 130C, 130D: Second coil

Claims (20)

1st core;
A second core disposed on the first core;
A bobbin comprising: a central portion having a through hole formed therein; a first portion located on one side of the central portion; and a second portion located on the other side of the central portion;
Including a coil portion arranged on the above bobbin,
The above coil portion includes a plurality of conductive lines arranged around the through hole,
The above plurality of challenge lines overlap vertically in the second section to form a plurality of overlapping regions,
The above-mentioned multiple overlapping regions are magnetically coupled devices spaced apart from each other along the horizontal direction. In the first paragraph,
A magnetic coupling device in which the above plurality of challenge lines form a turn centered on the through hole. In the first paragraph,
A magnetic coupling device in which at least some of the plurality of challenge lines overlap in the vertical direction at the central portion adjacent to the second portion. In the first paragraph,
A magnetic coupling device in which the ends of the plurality of above-mentioned challenge lines are arranged side by side without overlapping in the first section. In the fourth paragraph,
A magnetic coupling device further comprising a plurality of terminal pins arranged in the first section, wherein the two ends of the plurality of conductive lines are connected. In clause 5,
The above plurality of challenge lines include first to fourth challenge lines,
The above multiple overlapping areas are
A first region in which the third challenge line and the fourth challenge line vertically overlap;
A second region in which the first challenge line and the fourth challenge line vertically overlap;
a third region in which the second challenge line and the third challenge line vertically overlap; and
Including a fourth region in which the first challenge line and the second challenge line vertically overlap,
The first to fourth regions are magnetic coupling devices spaced apart from each other along the horizontal direction. In Article 6,
The above multiple terminal pins
Second and fifth terminal pins respectively connected to the two ends of the first challenge line;
First and sixth terminal pins, respectively connected to the two ends of the third challenge line;
The fourth and seventh terminal pins, respectively, are connected to the two ends of the second challenge line; and
A magnetic coupling device including third and eighth terminal pins, each of which is connected to the opposite ends of the fourth conductive wire. In Article 7,
A first turn part in which the first and third challenge lines are connected in parallel; and
A magnetic coupling device including a second turn part in which the second conductive line and the fourth conductive line are connected in parallel. In Article 8,
The above first turn portion forms a first signal of the secondary coil of the magnetic coupling device,
The second turn part forms a second signal of the secondary coil of the magnetic coupling device,
The above first terminal pin and the above second terminal pin correspond to input terminals for the first signal,
The above fifth terminal pin and the above sixth terminal pin correspond to the ground for the first signal,
The above 7th terminal pin and the above 8th terminal pin correspond to input terminals for the above 2nd signal,
The above fourth terminal pin and the above third terminal pin are magnetic coupling devices corresponding to the ground for the second signal. In Article 9,
The third to sixth terminal pins are magnetic coupling devices arranged adjacent to each other. In Article 8,
The first and third conductive lines are arranged in a mirror image shape on a plane along the first direction based on the second and fourth conductive lines and the through hole,
A magnetic coupling device in which the first direction is a direction in which the first portion and the second portion face each other with the central portion therebetween. In Article 10,
A magnetic coupling device further comprising a short-circuiting section for short-circuiting the plurality of terminal pins. In Article 12,
The above paragraph
A first short circuit portion for short circuiting the first terminal pin and the second terminal pin;
A second short circuit portion for short-circuiting the seventh terminal pin and the eighth terminal pin; and
A magnetic coupling device comprising a third short-circuiting section for short-circuiting the third to sixth terminal pins. In Article 13,
The third paragraph section is a magnetic coupling device having a plane shape arranged between the first paragraph section and the second paragraph section. In the first paragraph,
A magnetic coupling device wherein the bobbin includes an opening exposing at least a portion of the overlapping region. In Article 15,
A magnetic coupling device wherein the above opening has a maximum length greater than twice the diameter of each of the plurality of conductive wires. In Article 15,
A magnetic coupling device wherein the planar area of the above opening is 50% to 90% of the total area of the above overlapping region. In the 15th paragraph, the opening is a magnetic coupling device having a semicircular plane shape. In the 15th paragraph, the opening is a magnetic coupling device having a polygonal plane shape. case;
A power supply unit (PSU) disposed within the case and including a magnetic coupling device; and
A display is disposed on one side of the case and outputs the received signal as an image,
The magnetic coupling device placed in the above power supply unit (PSU) is:
1st core;
A second core disposed on the first core;
A bobbin comprising: a central portion having a through hole formed therein; a first portion located on one side of the central portion; and a second portion located on the other side of the central portion;
Including a coil portion arranged on the above bobbin,
The above coil portion includes a plurality of conductive lines arranged around the through hole,
The above plurality of challenge lines overlap vertically in the second section to form a plurality of overlapping regions,
The above multiple overlapping areas are image output devices spaced apart from each other along the horizontal direction.