KR20220113653A - Magnetic component and display device having the same - Google Patents

Abstract

A transformer according to an embodiment of the present invention includes a core part, and a first coil part and a second coil part which are at least partially accommodated in the core part. In at least one of the first coil part and the second coil part, a plurality of conductive lines cross each other in a specific area, to reduce inductance deviation between the conductive lines.

Description

Magnetic element and image output device including the same

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

Various magnetic coupling devices such as a transformer or a line filter, for example, a coil component, are mounted on a power supply device of an electronic device.

Transformers (transformers) may be included in electronic devices for various purposes. For example, a transformer may be used to perform an energy transfer function of transferring energy from one circuit to another. In addition, the transformer may be used to perform a function of step-up or step-down to change the magnitude of the voltage. In addition, since only inductive coupling (coupling) between the primary and secondary windings occurs, a transformer having a characteristic that no DC path is directly formed can be used for the purpose of blocking DC and passing AC, or for insulating separation between two circuits. .

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

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 between them 11 and 12 ( 14). The secondary side coil 13 is composed of a plurality of conductive metal plates, and the primary side coil 14 usually has a shape in which a conductive wire is wound. Depending on the configuration, a bobbin (not shown) may be disposed between the upper core 11 and the lower core 12 .

In the transformer shown in FIG. 1, the primary side coil and the secondary side coil overlap in a vertical direction. When a conductive wire is applied instead of a conductive metal plate to the secondary side coil, the primary side coil and the secondary side coil overlap each other in the horizontal direction. can be placed.

However, when applying the conductive wire to the secondary coil, since they must be arranged side by side on a plane for slimming, when forming a turn around the midfoot of the core part, the inner conductive wire closest to the midfoot has the shortest length and the outermost The length of the conductive line is the longest, so that inductance deviation occurs. Such an inductance deviation causes a current shunt, which in turn causes severe heat generation.

An object of the present invention is to provide a transformer capable of reducing heat generation while being slim and a circuit board using the same.

In particular, it is an object of the present invention to provide a transformer capable of preventing heat generation due to inductance deviation due to a difference in length of coils made of conductive wires, 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 those of ordinary skill in the art to which the present invention belongs from the description below. will be able

A magnetic coupling device according to an embodiment includes a first core; a second core disposed on the first core; a bobbin including a through hole formed in the central portion, the bobbin having at least a portion disposed between the first core and the second core; a first coil part and a second coil part at least partially disposed on the bobbin, wherein any one of the first coil part and the second coil part is disposed along the periphery of the through hole, a first conductive line and a second conductive line including a first end and a second end, wherein the bobbin includes 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 a terminal portion having an end disposed thereon; and an electrodeposition unit facing the terminal unit with the through hole interposed therebetween, wherein a portion of the first conductive line and a portion of the second conductive line may vertically overlap on the electrodeposition unit.

For example, the second coil unit may be disposed inside the first coil unit.

For example, the first coil part and the second coil part may overlap in one direction.

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

For example, the one of the first coil part and the second coil part is disposed along the periphery of the through hole, and a third conductive wire and a fourth conductive wire each having a first end and a second end. may further include.

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

For example, the first conductive line may include another portion vertically overlapping with the other portion of the fourth conductive line, and a portion of the first conductive line and the other portion of the first conductive line may be disposed at different positions.

For example, the second conductive line may include another portion vertically overlapping with the other portion of the third conductive line, and a portion of the second conductive line and the other portion of the second conductive line may be disposed 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, the The second end of the third conductive line, the second end of the second conductive line, and the second end of the fourth conductive line may be disposed side by side on the terminal part.

For example, the first end of the fourth conductive line, the first end of the second conductive line, the second end of the first conductive line, and the second end of the third conductive line constitute a first terminal portion electrically shorted to each other. can do.

For example, a first end of the third conductive line and a first end of the first conductive line constitute a second terminal portion electrically shorted to each other, and a second end of the second conductive line and a second end of the fourth conductive line The ends may constitute a third terminal part electrically shorted to each other.

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

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

For example, the second coil unit may be disposed between the first protrusion and the first coil unit.

In addition, an image output device according to an embodiment 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 and outputting the received signal as an image; a magnetic coupling device disposed in the power supply unit (PSU), comprising: a first core; a second core disposed on the first core; a bobbin including a through hole formed in the central portion and having at least a portion disposed between the first core and the second core; a first coil portion and a second coil portion disposed at least partially on the bobbin; and , Any one of the first coil part and the second coil part includes a first conductive wire and a second conductive wire disposed along the periphery of the through hole and each having a first end and a second end, The bobbin may include: a terminal portion in which first and second ends of the first conductive line and first and second ends of the second conductive line are disposed; and an electrodeposition part facing the terminal part with the through hole interposed therebetween, wherein a part of the first conductive line and a part of the second conductive wire vertically overlap on the electrodeposition part, and disposed in the terminal part The first and second ends of the first conductive line and the first and second ends of the second conductive line may supply power to the display.

The transformer according to the embodiment may minimize a difference in length of the conductive wires by allowing a plurality of conductive wires constituting the coil to cross each other in one region.

In addition, the inductance deviation between the conductive lines constituting the same turn in parallel through the short circuit of the terminal pin is improved, so that heat generation is reduced.

In addition, since the bobbin has an opening in an area where the conductive lines cross each other, slimming is possible.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those of ordinary skill in the art to which the present invention belongs from the following description. will be.

1 is an exploded perspective view showing an example of a general slim-type transformer configuration.
2A is a plan view of a transformer according to an embodiment.
2B is a plan view illustrating a form in which a core part is removed from a transformer according to an exemplary embodiment.
2C is a cross-sectional view illustrating a transformer according to an embodiment taken along line A-A' of FIG. 2A.
3 is a plan view illustrating an example of a configuration of a second coil unit according to an embodiment.
4A is a pin map of a second coil unit according to an embodiment, and FIG. 4B is a circuit diagram of a transformer according to an embodiment.
5 is a plan view illustrating an example of a configuration of a second coil unit according to a comparative example.
6 shows a current deviation between a transformer according to an embodiment and a transformer according to a comparative example.
7 shows an example of a heat distribution form of a transformer according to an embodiment and a transformer according to a comparative example.
8 is a plan view illustrating an example of a configuration of a second coil unit according to another embodiment.
9 shows an example of a heat distribution form of a transformer according to an embodiment and a transformer according to another embodiment.
FIG. 10 is a view for explaining a form in which an overlap occurs between conductive lines in a second part of a second coil part according to an exemplary embodiment;
11A is an example of a plan view of a second coil unit according to another embodiment, FIG. 11B is a side view of the second coil unit shown in FIG. 11A, and FIG. 11C is another plan view of a second coil unit according to another embodiment Each example is shown.

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

Terms including an ordinal number such as second, first, etc. may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing 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. and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being “connected” or “connected” to another component, it is understood that the other component may be directly connected or connected to the other component, but other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

In the description of the embodiments, each layer (film), region, pattern or structures is referred to as “on” or “under” the substrate, each layer (film), region, pad or patterns. The description that it is formed on includes all those formed directly or through another layer. The criteria for the upper/above or lower/lower layers of each layer will be described with reference to the drawings. In addition, since the thickness or size of each layer (film), region, pattern, or structure in the drawings may be changed for clarity and convenience of description, it does not fully reflect the actual size.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It is to be understood that this does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, 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 such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Hereinafter, a transformer will be described as an example of the magnetic coupling device according to the present embodiment with reference to the accompanying drawings.

2A is a plan view of a transformer according to an embodiment, FIG. 2B is a plan view showing a form in which a core part is removed from the transformer according to an embodiment, and FIG. 2C is a transformer according to an embodiment taken along line A-A' of FIG. 2A It is a cross-sectional view showing a cross-section cut along the .

2A to 2C , the transformer 100 according to an exemplary embodiment may include core units 111 and 112 , a first coil unit 120 , and a second coil unit 130 . Hereinafter, each component will be described in detail.

The core parts 111 and 112 have a characteristic of a magnetic circuit and may serve as a path for magnetic flux. The core parts 111 and 112 may include an upper core 111 coupled from an upper side and a lower core 112 coupled from a lower side. The two cores 111 and 112 may be vertically symmetrical to each other or may have an asymmetrical shape. However, in the following description, it is assumed that the shape is vertically symmetrical for convenience of description. Also, the lower core 112 may be referred to as a 'first core' and the upper core 111 may be referred to as a 'second core'.

Each of the upper core 111 and the lower core 112 may include a flat body portion and a plurality of leg portions protruding from the body portion in the thickness direction (ie, three-axis direction) and extending along a predetermined direction. The plurality of leg portions extend along one axis (here, axis 1) on a plane and are spaced apart from each other along the direction of the other axis (here, axis 2), and one middle foot (CL) disposed between the two outer legs ) may be included. For example, since the leg portion of the first core 112 protrudes toward the second core 111 , it may be referred to as a 'first protrusion', and the leg portion of the second core 111 supports the first core 112 . Since it protrudes toward the side, it may be referred to as a 'second protrusion'.

When the upper core 111 and the lower core 112 are vertically coupled, each of the outer and midfoot of the upper core 111 faces the corresponding outer or midfoot of the lower core 112 . In this case, a gap of a predetermined distance (eg, 10 to 100 μm, but not necessarily limited thereto) may be formed between at least some of the exofoot pairs or midfoot pairs facing each other.

In addition, the core parts 111 and 112 may include a magnetic material, for example, iron or ferrite, but is not limited thereto.

The first coil unit 120 is wound to form a plurality of turns centered on the first bobbin B1 having the first through hole CH1 in the center, and the first through hole CH1 in the accommodating space of the first bobbin. and a first coil C1.

The second coil unit 130 includes a second bobbin B2 having a second through-hole (CH2 in FIG. 3 ) in the center, and a second through-hole CH2 in the accommodating space of the second bobbin B2 as a center. A second coil C2 disposed to form a turn may be included. Here, at least a portion of the first coil unit 120 may be disposed in the second through hole CH2. Accordingly, at least a portion of the first coil unit 120 and the second coil unit 130 may overlap in a horizontal direction. Here, the horizontal direction may be the first axial direction and/or the second axial direction disclosed in FIG. 3 . In addition, the vertical direction means a direction perpendicular to the horizontal direction, and may be the third axis direction illustrated in FIG. 3 . In addition, the accommodation space of the second bobbin B2 may be defined by an upper plate TP, a lower plate BP, and a sidewall 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 conductive wire is wound several times in a spiral or a plane spiral, but is not limited thereto. For example, the first coil C1 may be an enamel wire (USTC wire) wrapped with a fiber yarn, a Litz wire, a triple insulated wire (TIW), or the like.

According to an embodiment, the first coil unit 120 may correspond to a primary side coil of the transformer 100 , and the second coil unit 130 may correspond to a secondary side coil of the transformer 100 , but must be However, the present invention is not 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 a length with respect to the third axial direction, and the height direction may have the same meaning as the thickness direction, the third axial direction, and the vertical direction.

In addition, one of the first coil unit 120 and the second coil unit 130 may be provided with a plurality of conductive wires, and the other may be provided with a metal plate.

A more detailed configuration of the second coil unit will be described with reference to FIG. 3 .

3 is a plan view illustrating an example of a configuration of a second coil unit according to an embodiment.

In FIG. 3 , the upper plate TP of the second bobbin B2 is removed for convenience of description.

The second coil unit 130A illustrated in FIG. 3 includes a second bobbin B2, a second coil C2, and a plurality of terminal pins T1, T2, T3, T4, T5, T6, T7, and T8. can do.

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

A second through-hole CH2 may be disposed in the central portion CP, and a plurality of terminal pins T1, T2, T3, T4, T5, T6, T7, T8 may be disposed in the first portion 1P in the biaxial direction. ) can be placed side by side. Accordingly, the first part 1P may be referred to as a 'terminal part' due to the arrangement of terminal pins.

The second coil C2 may include a plurality of conductive lines L1 , L2 , L3 , and L4 .

Both ends of the plurality of conductive lines (L1, L2, L3, L4) are respectively electrically connected to different one of the plurality of terminal pins (T1, T2, T3, T4, T5, T6, T7, T8), One turn may be formed based on the second through hole CH2. Accordingly, the efficiency of the transformer can be increased by lowering the resistance to the applied current, and heat generated from the transformer can be suppressed by lowering the heat generated by the resistor.

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

On the other hand, at least a portion of the first conductive line L1 and the third conductive line L3 in the second conductive line L2 and the fourth conductive line L4 and the second portion 2P is along the triaxial direction. They can intersect to overlap. In addition, the plurality of conductive lines L1 , L2 , L3 , and L4 may be disposed in parallel with each other in the biaxial direction in the central portion CP and may extend along the uniaxial direction. In FIG. 3 , the plurality of conductive lines L1 , L2 , L3 , and L4 do not overlap each other in the triaxial direction in the central portion CP, but in the region adjacent to the second portion 2P, some in the triaxial direction. Overlapping may occur. That is, one side of each of the plurality of conductive lines L1, L2, L3, and L4 may extend to be disposed on the second portion 2P, and the other end may extend such that both ends thereof are disposed on the first portion 1P. have.

Due to the configuration of the second coil unit 130 described above, there is a portion in which overlapping between the conductive wires constituting the second coil C2 occurs in the second part 2P, etc., but in terms of individual conductive wires, only one turn is achieved. The two coils C2 can be seen to be wound in one layer. Due to the overlapping between the conductive lines, the second portion 2P may be referred to as an 'electrodeposited portion'.

This terminal pin connection state and the intersection in the second part 2P are for inductance matching between parts forming the same turn from a circuit point of view. This will be described with reference to FIGS. 4A and 4B.

4A is a pin map of a second coil unit according to an embodiment, and FIG. 4B is a circuit diagram of a transformer according to an embodiment.

4A and 4B, the first conductive line L1 and the third conductive line L3 are connected in parallel to form a first turn part NS2 for the first signal of the secondary coil of the transformer, The second conductive line L2 and the fourth conductive line L4 constitute the second turn part NS3 for the second signal of the secondary side coil. In this case, the first terminal pin T1 and the second terminal pin T2 correspond to the input terminal for the first signal, and the fifth terminal pin T5 and the sixth terminal pin T6 correspond to the input terminal for the first signal. It corresponds to the ground. In addition, the seventh terminal pin T7 and the eighth terminal pin T8 correspond to the input terminal for the second signal, and the fourth terminal pin T4 and the third terminal pin T3 correspond to the input terminal for the second signal. corresponds to the ground. Here, the ground of each signal may 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 may be electrically shorted. Here, different signals may mean electrically different polarities.

Returning to FIG. 3 again, due to the above-described connection between the conductive line and the terminal pins, the first conductive line L1 and the third conductive line L3 constituting the first turn part NS2 in parallel are the second turn part in parallel The second conductive line L2 and the fourth conductive line L4 constituting the NS3 and the second through hole CH2 are in the form of a mirror image (symmetrical) on a plane along the uniaxial direction. Accordingly, since the first turn portion NS2 and the second turn portion NS3 have substantially the same conductive line configuration, impedance deviation or inductance deviation due to a difference in length of the conductive line is minimized, and heat generation due to current concentration is reduced. can be Here, the fact that the first turn part NS2 and the second turn part NS3 have substantially the same conductive line configuration may mean a length and/or a thickness. In addition, the meaning of being identical may not necessarily mean being completely identical. That is, the deviation in length or thickness may mean within 1 to 10%, and this difference may be narrowed depending on the process. That is, it may mean that the deviation of the length is within 10%, and it may mean that the deviation of the thickness of the conductive line is within 10%. However, when the deviation has a deviation greater than 10%, an impedance deviation or an inductance deviation may be caused, and it may be difficult to improve heat generation due to current concentration. That is, it is preferable to provide the conductive wire so that the deviation is 10% or less, and ideally it is good to provide the conductive wire so that the deviation is 0%, but the length or thickness of the conductive wire may differ substantially depending on the process. It is preferable to provide a conductive wire so that the difference is 10% or less.

The effect of the above-described configuration of the second coil unit 130A will be described in more detail through comparison with a comparative example with reference to FIGS. 5 to 7 .

5 is a plan view illustrating an example of a configuration of a second coil unit according to a comparative example.

Referring to FIG. 5 , in the second coil unit 130 ′ according to the comparative example, the configuration of the second bobbin B2 is the same as that of the first embodiment, but a plurality of conductive wires L1 , L2 , L3 , and L4 are connected to each other. They are parallel and do not intersect each other so that at least a portion overlaps each other in the three-axis direction even in the second portion 2P. In this case, since the first conductive line L1' forms a turn at the innermost side, it has the shortest length, and since the fourth conductive line L4' forms a turn at the outermost side, it has the longest length.

6 shows a current deviation between a transformer according to an embodiment and a transformer according to a comparative example.

Referring to FIG. 6 , graphs are shown at the top and bottom, respectively, in each graph, in common, the vertical axis represents current and the horizontal axis represents time. In addition, the upper graph shows the effective (rms) current of each turn in the second coil unit 130A according to an embodiment, and the lower graph shows the effective (rms) current of each turn in the second coil unit 130' according to the comparative example. rms) represents the current.

First, as shown in the upper graph, since the second coil unit 130A according to an embodiment has substantially the same conductive line configuration between the turn units, the current difference between the first turn unit NS2 and the second turn unit NS3 is It is only 0.39A.

On the other hand, as shown in the upper graph, the second coil unit 130 ′ according to the comparative example has a different conductive line configuration between the turn units, so that the difference in current between the first turn unit NS2 and the second turn unit NS3 is 1.56A was reached.

This current concentration causes a difference in heat generation. This will be described with reference to FIG. 7 .

7 shows an example of a heat distribution form of a transformer according to an embodiment and a transformer according to a comparative example.

Referring to FIG. 7 , the upper image is a thermal imaging camera image taken during operation of a transformer to which the second coil unit 130A according to an embodiment is applied, and the temperature in the region 610 corresponding to the first unit 1P is It can be seen that is relatively uniform, and the maximum temperature was also measured to be about 68 degrees.

The lower image is a transformer to which the second coil unit 130 ′ according to the comparative example is applied, and it can be seen that current is concentrated in a specific region 620 , so that heat is unbalanced, and the maximum temperature is 70.7 degrees Celsius, which is higher than in the embodiment.

The transformer according to the exemplary embodiment described so far has an effect of reducing inductance deviation due to the fact that each of the conductive lines constituting the second coil C2 of the second coil unit 130 has a symmetrical shape for each signal. However, as shown in FIG. 3 , the length of each conductive line connected in parallel is different even for a turn unit corresponding to the same signal. For example, in the case of the first conductive line L1 and the third conductive line L3 constituting the first turn part NS2 , the first conductive line L1 is located inside the third conductive line L3 . Therefore, the length is relatively short. Therefore, in order to minimize the deviation of the conductive line, another embodiment of the present invention proposes to reduce the deviation of the input inductance occurring in the terminal pin in the transformer by shorting the terminal pins to each other. The configuration of the second coil unit for this purpose will be described with reference to FIG. 8 .

8 is a plan view illustrating an example of a configuration of a second coil unit according to another embodiment.

Since the configuration of the second coil part 130B according to the other embodiment shown in FIG. 8 is the same as that of the second coil part 130A according to the embodiment except for the short circuit parts SP1, SPC, and SP2, A duplicate 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 may be shorted through the first short circuit unit SP1 . In addition, the seventh terminal pin T7 and the eighth terminal pin T8 corresponding to the input terminal of the second signal may be short-circuited through the second short circuit unit SP2 . In addition, the third to sixth terminal pins T3 , T4 , T5 , and T6 corresponding to the ground of the center tap configuration may be shorted through the center short circuit unit SPC.

Here, each of the short circuits SP1 , SP2 , and SPC may be implemented through soldering, but this is exemplary and not necessarily limited thereto, and is not limited in any way if a short circuit between the terminal pins is possible. For example, each shorting part SP1 , SP2 , and SPC may be implemented through a conductor clip, a conductor pin, or a combination thereof and soldering.

In FIG. 8 , the center shorting part SPC is integrally configured to short-circuit all of the third to sixth terminal pins T3, T4, T5, and T6, but according to another aspect, the center shorting part SPC is the first A first center short circuit (not shown) for shorting the third terminal pin T3 and the fourth terminal pin T4, and a second center short circuit for shorting the fifth terminal pin T5 and the sixth terminal pin T6 It may consist of a part (not shown). In this case, the first center shorting part (not shown) and the second center shorting part (not shown) may not be physically connected in the transformer. Here, not physically connected means that the first center short circuit (not shown) and the second center short part (not shown) are not directly connected, and it means that they are not electrically connected through another connection member. I never do that.

Effects of the second coil unit 130B according to another embodiment will be described with reference to FIG. 9 .

9 shows an example of a heat distribution form of a transformer according to an embodiment and a transformer according to another embodiment.

Referring to FIG. 9 , the upper image is a thermal image camera image taken during the operation of the transformer to which the second coil unit 130A according to an embodiment is applied, and each terminal corresponding to the center tap is not short-circuited near the center tap ( 910), it can be seen that the heat is relatively concentrated.

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

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

division in part 2 cross in part 2 no intersection conduction line 2nd Ls [uH] conduction 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 first center short &
second center short 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 Integral center short circuit 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 with the results shown in Table 1 was performed with a total of 6 cases depending on whether there was an intersection between the conductive lines in the second part 2P of the second bobbin B2 and the configuration of the short circuit part, and the measured values were measured for each conductive wire ( The inductance of L1 to L4) was measured.

That is, in the division of Table 1, "intersection in the second part" means a configuration in which the crossing between the conductive lines occurs in the second part 2P of the second bobbin B2 as shown in FIG. 3 or FIG. 8, and "second “No intersection in the part” may mean the same configuration as in FIG. 5 . Here, “intersecting” may mean vertically overlapping. “Crossing in the second part” may mean vertically overlapping in the electrodeposition part. According to an embodiment, it may mean that the conductive lines do not overlap vertically in the terminal portion, but vertically overlap in the electrodeposition portion. That is, as a plurality of conductive wires are arranged to have ideally the same length and/or thickness, as shown in FIG. 8 , by displacing them from each other, it may have a structure that vertically overlaps in the electrodeposition part, and thus the ends of each conductive wire in the terminal part may have a structure in which they are arranged side by side. Accordingly, current concentration, inductance deviation, impedance deviation, and heat generation may be reduced.

In addition, "no shorting part" means a configuration without a shorting part as shown in FIG. 3 or 5, and "integrated center shorting part" means a shorting part configuration as shown in FIG. 8 . In addition, the "first center shorting part & second center shorting part" short-circuits the third terminal pin T3 and the fourth terminal pin T4 in the configuration of FIG. 8 in which the center shorting part SPC is not integral. It means a configuration separated into a first center short circuit (not shown) and a second center short circuit (not shown) that shorts 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 cases of "crossing in part 2" showed a smaller inductance deviation compared to the cases of "no crossing in part 2". It can be seen that lowering the length deviation between the conductive lines is effective in resolving the inductance deviation.

In addition, it can be seen that the inductance deviation was significantly lower when the shorting part was present compared to the case where the shorting part was not present. can

Meanwhile, as the conductive lines cross each other in the second part 2P of the second bobbin B2 , overlap may occur between the conductive lines in the three-axis direction. Accordingly, when the height of the sidewall SW of the second bobbin B2 is at least twice the thickness of the conductive line, deformation of the second bobbin B2 in the second part 2P can be prevented. However, the thickness of the second bobbin B2 as a whole is increased due to the securing of the height of the sidewall SW, which may increase the thickness of the entire transformer. Here, the direction defining the height and thickness may refer to a vertical direction or a third axis direction. This will be described with reference to FIG. 10 .

FIG. 10 is a view for explaining a form in which an overlap occurs between conductive lines in a second part of a second coil part according to an exemplary embodiment; In FIG. 10 , the conductive lines L1 , L2 , L3 , and L4 are expressed as solid lines irrespective of overlap.

Referring to FIG. 10 , the second part 2P of the second coil part has a plurality of overlapping regions according to an overlapping combination pair between a plurality of conductive wires. For example, in the second portion 2P, a first area A1 in which the third conductive line L3 and the fourth conductive line L4 vertically overlap on a plane, the first conductive line L1 and the fourth conductive line L4 A second region A2 in which the conductive line L4 vertically overlaps 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 first A fourth area A4 in which the conductive line and the second conductive line vertically overlap on a plane is generated. The first to fourth areas A1 to A4 described above may be spaced apart from each other in 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 perpendicular thereto, a height direction, or a thickness direction.

In these areas A1, A2, A3, and A4, a larger accommodating space is required in the three-axis direction compared to the remaining areas.

Accordingly, in another embodiment of the present invention, an opening is formed in at least one of the upper plate TP and the lower plate BP in the region corresponding to the second part 2P of the second bobbin B2, and the second bobbin It is suggested to prevent thickness increase.

11A is an example of a plan view of a second coil unit according to another embodiment, FIG. 11B is a side view of the second coil unit shown in FIG. 11A in the direction of the arrow at the top of FIG. 11A, and FIG. 11C is another embodiment Another example of a plan view of the second coil unit according to each other is shown.

11A and 11B together, in the second coil unit 130C according to another embodiment, an opening OP1_T having a semi-circular planar shape in each of the upper plate TP_A and the lower plate BP_A of the second bobbin , OP1_B) is formed. Due to having these openings OP1_T and OP1_B, as shown in FIG. 11B , the bobbin even if the height h2 of the receiving space (that is, the height of the side wall SW) is smaller than twice the diameter D of the conductive wire. A space where the conductive lines intersect can be secured without deformation of the . Accordingly, an increase in the thickness of the second bobbin can be prevented.

Meanwhile, the maximum length h1 of the openings OP1_T and OP1_B in the uniaxial direction is preferably greater than twice the diameter of each conductive wire (2*D) as shown in FIG. 10 . In addition, the positions of the openings OP1_T and OP1_B preferably include at least a part of each of the four regions A1 , A2 , A3 , and A4 in which the overlapping between the conductive lines of FIG. 10 occurs. In addition, the planar area of the openings OP1_T and OP1_B is preferably 50% to 90% of the sum of the areas of the four regions A1, A2, A3, and A4 where the conductive lines overlap, but is not necessarily limited thereto.

In addition, although the planar shape of the openings OP1_T and OP1_B is shown as a semicircle in FIG. 11A , this is exemplary and each of the four regions A1, A2, A3, and A4 in which the overlapping between the conductive lines occurs may be included at least partially. If there is, it is not limited to the shape of a circle, a track type, a polygon, etc. For example, as shown in FIG. 11C , the openings OP2_T and OP2_B of the second coil unit 130D may have a triangular planar shape.

The transformer according to the embodiments described so far has been described assuming that the second coil units 130, 130A, 130B, 130C, and 130D correspond to the secondary side coils of the transformer, but the second coil units 130, 130A, 130B, The configuration for reducing the inductance deviation applied to 130C and 130D may be applied to the first coil unit 120 or both the first and second coil units.

In addition, as described above, the transformer 100 according to the embodiment may constitute a circuit board (not shown) constituting the power supply unit (PSU), etc. together with other magnetic elements (eg, inductors).

When the magnetic coupling device having the above-described characteristics of the invention is used in a smart phone, a server computer, an image output device (eg, TV), an IT device such as a vehicle, a home appliance, or a vehicle, it has a slim thickness and power The conversion function can be performed stably. When using a conventional magnetic coupling device, for example, a transformer, it is difficult to make the volume of home appliances or IT devices thin. can have However, in the magnetic coupling device having the above-described features of the invention, for example, the power supply unit (PSU) may be configured to have a small thickness and/or a small area, which may cause a decrease in power conversion efficiency, leakage current, It can solve the problem of leakage inductance. Accordingly, by smoothly supplying power to each component in the entire product, it is possible to reduce heat generation, have high power conversion efficiency, and solve problems of leakage current and leakage inductance. For example, when the power supply unit (PSU) constituted by the magnetic coupling device having the above-described characteristics of the present invention is applied to an image output device (eg, a TV), a low-power image output device (eg, For example, it is possible to provide a thinner TV) to the consumer, thereby providing a driving force for the consumer to purchase an image output device (eg, a TV) to which the magnetic coupling device having the features of the present invention is applied. The above-described image output device (eg, TV) may include a display and a power supply unit (PSU) in a case. It may be applied as a transformer for converting power to be applied to the display, or it may be applied for high frequency to reduce power consumption. That is, a display, a power supply unit (PSU), and a signal receiving device are connected to a magnetic coupling device having the characteristics of the present invention in a case of an image output device (eg, TV), and an image output device having a thin thickness (eg, , TV) can achieve functional unity or technical interlocking so that it can operate stably without heat problem.

In addition, when used in IT devices, home appliances, and vehicles, the entire product can be made in a smaller volume and the stable function of the product can be maintained, so that the entire product and the magnetic coupling device to which the present invention is applied are functionally integrated with each other. It can achieve gender or technical interoperability.

In the above, the embodiment has been mainly described, but this is only an example and does not limit the present invention, and those of ordinary skill in the art to which the present invention pertains are not exemplified above in the range that does not depart from the essential characteristics of the present embodiment. It will be appreciated that various modifications and applications are possible. For example, each component specifically shown in the embodiment may be implemented by modification. And the differences related to these modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

100: transformers 111, 112: core part
120: first coil
130, 130A, 130B, 130C, 130D: second coil

Claims (1)

a first core;
a second core disposed on the first core;
a bobbin including a through hole formed in the central portion, the bobbin having at least a portion disposed between the first core and the second core;
and a first coil part and a second coil part, at least a portion of which is disposed on the bobbin.

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