KR20200070836A - Planar coil and magnetic component including the same - Google Patents

Abstract

The present invention relates to a planar coil stackable in series or in parallel and a magnetic element including the same. The planar coil includes: a substrate portion; an upper coil portion disposed on an upper surface of the substrate portion; and a lower coil portion disposed on a lower surface of the substrate portion. An outer diameter side end of the upper coil portion extends in a first direction and an outer diameter side end of the lower coil portion extends in a second direction wherein the first and second directions may form a predetermined angle with each other.

Description

Planar coil and magnetic element including the same {PLANAR COIL AND MAGNETIC COMPONENT INCLUDING THE SAME}

The present invention relates to a planar coil stackable in series or parallel and a magnetic element comprising the same.

Inductors and transformers, which are magnetic elements widely used in various devices, have coils forming one or more turns. However, it is common for the coil to take a winding-type structure in which a conductor having a circular or polygonal cross-sectional shape is wound in one direction.

However, the winding-type structure cannot be used for a slim type device mounted in a device having a relatively narrow mounting space due to the thickness of the conducting wire. Therefore, a multilayer substrate structure in which a flat substrate (for example, a printed circuit board (PCB)) is stacked is applied to the slim type device.

However, the multi-layered substrate structure is difficult to manufacture, has many defects, and also has a problem in that the production cost is more than 5 times higher than that of the winding type. In addition, since it is usually designed according to the performance required for a single product, it is difficult to change the configuration such as the number of turns of the coil.

Technical problem to be achieved by the present invention is to provide a planar coil that can be applied to various connection structures and a magnetic element including 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 that are not mentioned will be clearly understood by those skilled in the art from the following description. Will be able to.

The coil for a magnetic element according to an embodiment includes at least three planar coils stacked in a thickness direction, wherein each of the at least three planar coils is disposed on a substrate portion, an upper surface of the substrate portion, and has a spiral planar shape. An upper coil part having a lower coil part disposed on a lower surface of the substrate part and having a spiral planar shape, the substrate part having a hollow defining an inner diameter, and having an annular planar shape; And a first connection portion extending from one edge of the outer diameter side of the ring portion, wherein an outer diameter side end portion of the upper coil portion extends in a direction away from the hollow portion of the ring portion and is disposed on an upper surface of the first connection portion, and the lower portion. The outer diameter side end of the coil portion extends in a direction away from the hollow of the ring portion and is disposed on the lower surface of the first connection portion, the first direction in which the outer diameter side end portion of the upper coil portion extends, and the outer diameter side end portion of the lower coil portion The second direction in which the elongation forms a predetermined angle with each other, the hollows of each of the three planar coils overlap each other in the thickness direction, and the other planar coils adjacent to each other in the thickness direction are rotated in one direction by the predetermined angle. Can be stacked.

For example, in each of the at least three planar coils, the outer diameter side end portion of the upper coil portion and the outer diameter side end portion of the lower coil portion may be spaced apart from each other in a plane and may not overlap each other in the thickness direction.

For example, the substrate portion may further include a second connection portion extending from the other outer diameter edge region facing the one edge region around the hollow in the ring portion.

For example, the predetermined angle may be 5 to 30 degrees.

For example, at least a portion of the inner diameter end of the upper coil portion and the inner diameter side end of the lower coil portion overlap each other in the thickness direction on a plane, and may be electrically connected to each other through a through hole of the ring portion.

For example, in the two planar coils adjacent to each other in the thickness direction among the at least three planar coils, an outer diameter side end of the upper coil part disposed in one planar coil is disposed in the other planar coil part. The lower coil part may be electrically connected to the outer diameter side end of each other.

For example, it may further include a planar coil having the same shape as each of the at least three planar coils, but overlapping and stacking one of the at least three planar coils in the thickness direction.

For example, the first connection portion may have a plurality of through holes.

For example, the plurality of through holes may respectively penetrate the outer diameter side end portion of the upper coil portion and the outer diameter side end portion of the lower coil portion.

For example, at least a portion of the plurality of through-holes of a planar coil adjacent in the thickness direction may overlap in the thickness direction.

For example, the coil for the magnetic element further includes at least one conductive portion, a portion of each of the at least one conductive portion is disposed in a through hole overlapping in the thickness direction, and the other portion is extended in the thickness direction and exposed to the outside Area may be included.

The magnetic element according to an embodiment includes at least three planar coils stacked in a thickness direction; And a core, wherein each of the at least three planar coils is disposed on a substrate portion, an upper surface of the substrate portion, an upper coil portion having a helical flat shape, and a lower nose having a helical flat shape, disposed on a lower surface of the substrate portion. It includes a part, the substrate portion has a hollow defining an inner diameter, a ring portion having an annular planar shape; And a first connection portion extending from one edge of the outer diameter side of the ring portion, wherein an outer diameter side end portion of the upper coil portion extends in a direction away from the hollow portion of the ring portion and is disposed on an upper surface of the first connection portion, and the lower portion. The outer diameter side end of the coil portion extends in a direction away from the hollow of the ring portion and is disposed on the lower surface of the first connection portion, the first direction in which the outer diameter side end portion of the upper coil portion extends, and the outer diameter side end portion of the lower coil portion The second direction in which the elongation forms a predetermined angle with each other, the hollows of each of the three planar coils overlap each other in the thickness direction, and the other planar coils adjacent to each other in the thickness direction are rotated in one direction by the predetermined angle. Can be stacked.

Since the planar coil according to the embodiment can be applied to various connection structures, the performance control of the magnetic element is free.

In addition, in the planar coil according to the embodiment, since the outer diameter side end portion in which the current flows in the opposite direction forms a predetermined angle, the reduction in efficiency due to leakage current is alleviated.

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

1A is an exploded perspective view of a planar coil according to an embodiment, and FIG. 1B is a plan view of the planar coil shown in FIG. 1A.
2A is an exploded perspective view of a planar coil according to another embodiment, and FIG. 2B is a plan view of the planar coil according to another embodiment.
3 shows an example of a form in which two planar coils are stacked in series according to an embodiment.
4 is a side view of the series-stacked planar coil viewed from the direction A in FIG. 3;
5 is a view for explaining the effect on the leakage current of the planar coil according to an embodiment in comparison with a comparative example.
6 is a graph for explaining inductance characteristics of a planar coil according to an embodiment compared to a comparative example.
7 is a graph for explaining the quality factor characteristics of a planar coil according to an embodiment compared to a comparative example.
8A is an exploded perspective view showing an example of an inductor using a planar coil according to an embodiment, and FIG. 8B is a perspective view of the inductor shown in FIG. 8A.
9 shows a core portion structure that can be applied to a magnetic element according to embodiments.
10 is an exploded perspective view showing another example of an inductor using a planar coil according to an embodiment.
11 is an exploded perspective view showing an example of a transformer using a planar coil according to an embodiment.

The present invention can be applied to various changes and can have various embodiments, and specific embodiments will be 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 ordinal numbers such as second and first may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from other components. For example, the second component may be referred to as a first component without departing from the scope of the present invention, and similarly, the first component may also be referred to as a second component. The term and/or includes a combination of a plurality of related described items or any one of a plurality of related described items.

When an element is said to be "connected" or "connected" to another component, it is understood that other components may be directly connected to or connected to the other component, but there may be other components in between. It should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that no other component exists in the middle.

In the description of the embodiments, each layer (film), region, pattern or structure may be "on/up" or "under" of the substrate, each layer (film), region, pad or patterns. The substrate to be formed on includes all formed directly or via another layer. The criteria for top/bottom or bottom/bottom of each layer are described based on the drawings. In addition, the thickness or size of each layer (film), region, pattern, or structure in the drawings may be modified for clarity and convenience of description, and thus does not entirely 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. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, terms such as “include” or “have” are intended to indicate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains. Terms, such as those defined in a commonly used dictionary, should be interpreted as having meanings consistent with meanings in the context of related technologies, and should not be interpreted as ideal or excessively formal meanings unless explicitly defined in the present application. Does not.

1A is an exploded perspective view of a planar coil according to an embodiment, and FIG. 1B is a plan view of the planar coil shown in FIG. 1A.

Referring to FIGS. 1A and 1B together, a planar coil 100A according to an embodiment includes a substrate portion 110, an upper coil portion 120 disposed on an upper surface of the substrate portion 110, and a bottom surface of the substrate portion It may include a lower coil portion (130A) disposed in.

The substrate portion 110 includes two connection portions 111 and 113 for electrical or physical connection with adjacent coils 100A, and a ring portion having a ring-shaped planar shape. That is, a portion of the substrate portion 110 excluding each of the connecting portions 111 and 113 may correspond to the ring portion. The ring portion has a hollow (CH) defining an inner diameter in the center. The hollow (CH), the inner diameter and the outer diameter of the annular portion may be aligned along the same center point (CP). That is, the inner diameter and the outer diameter correspond to concentric circles.

The connecting parts 111 and 113 are respectively disposed at both edges facing each other on the outer diameter side of the ring centered around the center point CP or the hollow CH, and have an arc-shaped planar shape. In other words, each of the connecting portions 111 and 113 may extend in a direction away from the center point CP in one edge region on the outer diameter side of the ring portion. At this time, the arc-shaped planar shape of the connecting portions 111 and 113 may also share the center point CP.

Each of the first connecting portion 111 and the second connecting portion 113 has a plurality of through holes spaced apart from each other on a plane. For example, the first connection portion 111 may have four through holes H1, H2, H3, and H4, and the second connection portion 113 may have four through holes H6, H7, H8, and H9. At this time, the through-holes of the respective connection parts 111 and 113 may be aligned in a plane along two axes X1 and X2 passing through the center point CP. Therefore, it can be seen that the two axes X1 and X2 extend in one radial direction of the substrate portion 110. For example, H1, H2, H6 and H7 are aligned side-by-side along the first axis X1, and H3, H4, H8 and H9 are side-by-side along the second axis X2. Here, the first axis X1 and the second axis X2 intersect at the center point CP with a certain angle θ. The size and meaning of the angle will be described later with reference to FIG. 5. According to an embodiment, each connecting portion 111 and 113 may have only two through holes having the same distance from the central point CP. For example, each of the connecting parts 111 and 113 may have only H1, H3, H6 and H8, or may have only H2, H4, H7 and H9.

Meanwhile, the ring portion may have a through hole H5 adjacent to the inner diameter side. At least a portion of the through hole H5 is filled with a conductor (eg, plated through hole or via hole), and the inner diameter side end 127 of the upper coil part 120 and the inner diameter side end of the lower coil part 130 ( 137A) can be electrically connected. To this end, at least a portion of the inner diameter side end portion 127 of the upper coil portion 120 and the inner diameter side end portion 137A of the lower coil portion 130 may overlap in a thickness direction on a plane. Therefore, when the upper coil part 120 and the lower coil part 130 are connected in series and the rotation direction corresponding to the winding direction is the same, summing the number of turns of the upper coil part 120 and the lower coil part 130A It becomes the total number of turns of the planar coil part 100A. For example, since each coil part 120 and 130A shown in FIGS. 1A and 1B has 5 turns, the number of turns of the flat coil part 100A corresponds to 10 turns.

For example, the substrate portion 110 may include a polymer resin having insulating properties such as phenol, epoxy resin, and polyimide, but is not limited thereto.

Each of the upper coil portion 120 and the lower coil portion 130A may be formed of a thin film metal material having a spiral-shaped planar shape. For example, each coil part 120 or 130A may have a spiral planar shape converging to the center point CP, but is not limited thereto.

Each of the upper coil portion 120 and the lower coil portion 130A may have a spiral-shaped planar shape. For example, each coil part 120 or 130A may have a spiral planar shape converging to the center point CP, but is not limited thereto.

The outer coil-side ends 121 and 131A of the upper coil part 120 and the lower coil part 130A satisfy a target turn number that is a design target, and then bend or curve on the first connection part 111 to be farther from the center point CP Direction. In addition, each end (121, 131A) may have one or more through holes (123, 125, 133A, 135A). For example, the outer diameter side end 121 of the upper coil part 120 overlaps (or aligns) in the thickness direction with the first hole H1 of the first connection part 111 and the second hole 123 and the second hole. It may include a through hole 125 overlapping (or aligned) in the thickness direction with (H2). In addition, the outer diameter side end portion 131A of the lower coil portion 130A overlaps (or aligns) with the third hole H3 of the first connection portion 111 in the thickness direction (133A) and the fourth hole H4. ) And a through hole 135A overlapping (or aligned) in the thickness direction. In other words, when viewed as a whole of the planar coil 100A, a plurality of through-holes are disposed in the first extension portion 111, and each of the plurality of through-holes has an outer diameter side end portion 121 and a lower portion of the upper coil portion 120. It can be seen that it passes through the outer diameter side end portion 131A of the coil portion 130A.

Therefore, the two through holes 123 and 125 of the upper coil part 120 are aligned in a plane along the first axis X1, and the two through holes 133A and 135A of the lower coil part 130A are the second axis. It can be aligned on a plane along (X2).

If, each connection portion (111, 113) has only two through holes having the same distance from the center point (CP), the outer diameter end portion 121 of the upper coil portion 120 and the outer diameter side end portion of the lower coil portion 130A (131A) may also have only the through hole of the first connecting portion 111 and the through hole overlapping in the thickness direction. In addition, the extending direction of each of the outer diameter side end portion 121 of the upper coil portion 120 and the outer diameter side end portion 131A of the lower coil portion 130A crosses at a predetermined angle, wherein the angle is the first axis (X1). And it may correspond to the angle (θ) formed by the second axis (X2). In addition, it is preferable that each of the outer diameter side end portion 121 of the upper coil portion 120 and the outer diameter side end portion 131A of the lower coil portion 130A are spaced apart from each other in a plane and do not overlap each other in the thickness direction.

On the other hand, the outer diameter of the remaining portion (that is, the portion forming the helical plane shape) except for the outer diameter side ends 121 and 131A in each of the upper coil portion 120 and the lower coil portion 130A is the plane portion of the substrate portion 110 on the plane. It is preferably smaller than the outer diameter of the annular portion, and the inner diameter is larger than the inner diameter of the annular portion of the substrate portion 110 on a plane.

In addition, at the time of lamination, at least the first connecting portion 111 and the second connecting portion 113 among the upper and lower surfaces of the flat coil portion 100A are insulated from the coil portions 120 and 130A of other planar coils adjacent to each other in the thickness direction. It is preferable that the portion not corresponding to) is insulated through the formation of an insulating film. For example, the insulating film may be formed by attaching an insulating film, or may be formed by a method of applying an insulating material, but is not limited thereto.

2A is an exploded perspective view of a planar coil according to another embodiment, and FIG. 2B is a plan view of the planar coil according to another embodiment.

The planar coil 100B according to another embodiment illustrated in FIG. 2A has the same configuration of the substrate portion 110 and the upper coil portion 120 as compared to the planar coil 100A illustrated in FIGS. 1A and 1B. However, the lower coil portion 130B may have a shape in which the outer diameter side end portion 131B extends to the through hole H5 of the substrate portion 110 in the direction of the center point CP without forming a turn. Therefore, the number of turns of the planar coil 100B according to another embodiment is the same as the number of turns of the upper coil part 120. Of course, even in this case, the outer diameter side end portion 131B of the lower coil portion 130B may have through holes 133B and 135B overlapping with the through holes H3 and H4 of the first connection portion 111 in the thickness direction. have.

Next, in another embodiment shown in FIG. 2B, the other planar coil 100C is implemented in the rest of the configuration except that the second connection portion 113 is deleted compared to the planar coil 100A shown in FIGS. 1A and 1B. It may be the same as the planar coil 100A according to an example. Of course, according to an embodiment, the second connection part 113 may be deleted even in the planar coil 100B illustrated in FIG. 2A.

3 shows an example of a form in which two planar coils are stacked in series according to an embodiment.

The top of FIG. 3 is a plan view before coupling of the planar coils 100A-1 and 100A-2 according to the same two embodiments, and at the bottom of FIG. 3 the top two planar coils 100A-1 and 100A-2 ) Are stacked to show a plan view showing the series connected.

Here, in series connection, the outer diameter side terminal 121-1 of the upper coil portion 120-1 of one flat coil 100A-1 is different from the lower coil portion 130A-2 of the flat coil 100A-2. It has a form that is electrically connected to the outer diameter side terminal (131A-2). Therefore, for ease of understanding, the flat coil 100A-1 shown on the left shows only the upper coil portion 120-1 among the coil portions, and the flat coil 100A-2 shown on the right shows the lower nose of the coil portion. Only some (130A-2) are shown.

Referring to the upper part of FIG. 3, the outer coil-side terminal 121-1 of the upper coil part 120-1 of one flat coil 100A-1 for series connection has a lower nose of the other flat coil 100A-2. The two planar coils may be stacked shifted by a predetermined angle around the hollow CH so that the outer diameter side terminals 131A-2 of the part 130A-2 overlap with each other along the extension direction on the plane, or in the thickness direction. have. At this time, the predetermined angle may correspond to an angle θ formed between the first axis X1 and the second axis X2 as illustrated in FIG. 1B. For example, the right planar coil 100A-2 may be rotated counterclockwise by θ around the hollow CH. In this state, when the right planar coil 100A-2 is stacked by arranging the hollow CH on the left planar coil 100A-1 as a center, the state is as shown in the lower part of FIG. 3.

Referring to the bottom of FIG. 3, the outer coil side terminal 121-1 of the upper coil portion 120-1 of one flat coil 100A-1 has a lower coil portion 130A- of the other flat coil 100A-2. The outer diameter side terminals 131A-2 of 2) are aligned with each other along the extension direction on the plane, or overlap in the thickness direction. Therefore, the two through holes 123-1 and 125-1 of the outer diameter side terminal 121-1 of one flat coil 100A-1 are the outer diameter side terminal 131A-2 of the other flat coil 100A-2. ) Are aligned and overlapped with the two through holes 133A-2 and 135A-2 in the vertical direction. The overlap between the through holes may also occur in the second extension. For example, the H7-1 hole and the H9-2 hole, the H6-1 hole, and the H8-2 hole on the second extension side may be aligned and overlap each other in the thickness direction on the plane.

Through the overlapping relationship between these through-holes, it is possible to conduct and fix electricity through the insertion of the conducting portion. This will be described with reference to FIG. 4.

4 is a side view of the series-stacked planar coil viewed from the direction A in FIG. 3;

Referring to FIG. 4, from the top to the bottom, the fourth hole H4 disposed in the first region 111-2 of the upper planar coil, and the through hole 135A-2 of the outer diameter terminal 131A-2 ), the second hole H2 disposed in the first hole 111-1 of the lower outer planar coil and the through hole 125-1 of the other outer diameter terminal 121-1 is stacked as shown in FIG. 3. Due to the state, it is overlapped and aligned in the thickness direction to integrally form one through hole TH. When inserting a pin-shaped conductive part 140 having a diameter corresponding to the diameter of the through-hole TH, hereinafter referred to as "pin" for convenience, the lamination state of the two planar coils 100A-1 and 100A-2 In addition to being fixed, the electrical connection between the two outer diameter terminals 131A-2 and 121-1 can be further strengthened. Depending on the embodiment, the pin 140 may be fixed to the through-hole TH through fitting, or may be fixed to the through-hole TH through soldering, but is not limited thereto. In addition, when the pin 140 is inserted into the through hole TH, a part of the pin 140 is disposed in the through hole TH, and the other part extends in the thickness direction to have an area exposed to the outside.

On the other hand, due to the arrangement of the pins 140, the electrical connection is stable and the mechanical strength is improved, and the pins 140 themselves are arranged in each coil part 120-1, 130A-2 arranged along the corresponding through hole TH. It can also act as a terminal for electrical connection with external devices/circuits. In addition, when the pin 140 is made of a material having electrical conductivity and thermal conductivity (eg, copper, aluminum, etc.), the pin 140 performs a heat dissipation or heat transfer function that discharges heat from each coil part to the outside. You may. For example, when the pin 140 is connected to a substrate on which a magnetic element using the planar coils 100A, 100B, and 100C is mounted, a heat sink, or a cooling element, the pin 140 functions as a heat dissipation path of the magnetic element. can do.

The pin 140 may be disposed in at least one of the through holes disposed in the first connection portion 111, and must be disposed in the through hole overlapping the first connection portion 111 of the other planar substrate in the thickness direction. no. In addition, regardless of the heat transfer property or electrical conductivity, the pin 140 may be disposed in at least a portion of the through hole of the second connection portion 111 to improve mechanical strength. Accordingly, in the following drawings and descriptions, even if the pins 140 are not shown, the pins 140 may be disposed in at least a portion of each through hole.

Hereinafter, with reference to FIGS. 5 to 7, the extending direction of each of the outer diameter side ends 121 of the upper coil part 120 and the outer diameter side ends 131A, 131B of the lower coil parts 130A, 130B forms a predetermined angle. Explain the effect according to.

5 is a view for explaining the effect on the leakage current of the planar coil according to an embodiment in comparison with a comparative example.

The RLC equivalent circuit of the coil part 120'+130A' according to the comparative example is shown on the left side of FIG. 5, and the equivalent RLC circuit of the coil part 120+130A according to the embodiment is shown on the right side of FIG.

5, the extending direction of each of the outer diameter side ends (121, 131A) of the coil portion according to the embodiment forms a predetermined angle (θ), while the coil portion (120' + 130A' according to the comparative example) The extension directions of the outer diameter-side both ends 121' and 131A' have the same configuration as each other except that they are parallel to each other.

Therefore, the coil part according to the comparative example and the embodiment can be regarded as having the same size of the main component of the resistance, the main component of the inductance, and the mounting state variable in common. Here, the mounting state variable may be a value that varies depending on the distance from the ground (GND). On the other hand, as the outer diameter side end configuration is different, the inductance interference is different. This is due to the fact that the direction of the current I is opposite to both ends of the outer diameter side. Specifically, according to Ampere's law, the direction of the magnetic field is determined by the direction in which the electric current flows. When electric current flows in two opposite conductors in opposite directions, the magnetic field occurs in a direction that cancels each other. Inductance due to leakage current Deterioration occurs. Therefore, in the comparative example, the inductance interference is not only-but also the high-frequency resistance is increased, so the quality factor is also reduced. In addition, when the extending directions of both ends of the outer diameter side are parallel to each other, alignment of both ends of the outer diameter side becomes impossible when the planar coil portions are stacked in series as in FIG. 3.

On the other hand, in the embodiment, the size of the inductance interference component is smaller than the comparative example according to the angle θ between the outer diameter side ends. For example, the amount of mutual interference starts to decrease from the moment when θ has an angle greater than 0 degrees, and when it is 45 degrees or more, the amount of mutual interference becomes minimum. However, if the angle θ between both ends of the outer diameter side according to the embodiment is less than 5 degrees, the amount of mutual interference increases, and if it is greater than 45 degrees, the first extension 111 and the second extension of each planar coil according to the number of series stacking The plane area occupied by (113) is too large to limit the number of layers. Therefore, the angle θ between both ends of the outer diameter side according to the embodiment is preferably 5 degrees to 45 degrees, and more preferably may have a range of 5 degrees to 30 degrees.

6 is a graph for explaining inductance characteristics of a planar coil according to an embodiment compared to a comparative example.

In FIG. 6, the horizontal axis represents frequency, and the vertical axis represents inductance. Referring to FIG. 6, it can be seen that the comparative example having the configuration as shown in the left side of FIG. 5 has low inductance in most frequency domains compared to the embodiment having the same configuration as the right side in FIG. 5.

7 is a graph for explaining the quality factor characteristics of a planar coil according to an embodiment compared to a comparative example.

In Figure 7, the horizontal axis represents frequency, and the vertical axis represents quality factor (Q). Referring to FIG. 7, it can be seen that the comparative example having the configuration as the left side of FIG. 5 has a lower quality factor in the entire frequency domain compared to the embodiment having the configuration as the right side of FIG. 5.

Hereinafter, a magnetic element configured through lamination of planar coils 100A, 100B, and 100C according to an embodiment will be described with reference to FIGS. 8A to 11.

8A is an exploded perspective view showing an example of an inductor using a planar coil according to an embodiment, and FIG. 8B is a perspective view of the inductor shown in FIG. 8A.

8A and 8B, the inductor 200A according to the embodiment is composed of three planar coils 100A-1, 100A-2, 100A-3 and core parts 150 stacked in the thickness direction. Can be.

At this time, since each of the planar coils 100A-1, 100A-2, and 100A-3 is connected in series in the same manner as described above with reference to FIG. 3, the total number of turns may correspond to 30 turns. In addition, a pin 140 may be inserted into the through-hole of each connection portion as described above with reference to FIG. 4.

The core portion 150 may include an upper core 151 and a lower core 152, and the middle of the core portion 150 may be formed of stacked flat coils 100A-1, 100A-2, and 100A-3. It can penetrate the hollow. The core portion 150 may be made of a ferrite-based material, but is not limited thereto. In addition, the illustrated core portion 150 is a PQ-type core, which is as well-known and thus detailed description will be omitted. According to an embodiment, the core unit 150 may be replaced with a core of another shape such as an EE type core or an E-I type core instead of the PQ type.

9 shows a core portion structure that can be applied to a magnetic element according to embodiments.

Referring to (a) of FIG. 9, a gap (gap, G1) or an air gap may be disposed between each middle of the upper core 151 and the lower core 152 in the core portion 150. . When the core portion 150 has such a structure, the current density increases in the coil portion around the corresponding portion, and heat generation is relatively large. For example, when the planar coil part 100A according to the embodiment is applied, the upper coil part 120 and the lower coil part 130A each have a large current density on the inner diameter side closer to the middle gap G1 than the outer diameter side. Fever occurs. In order to solve this problem, the line width may be increased as the upper coil portion 120 and the lower coil portion 130A are closer to the inner diameter side from the outer diameter side, respectively. For example, as illustrated in FIG. 1B, when each of the upper coil portion 120 and the lower coil portion 130A forms 5 turns, each turn is divided from the outer diameter side to the inner diameter side from the 1 turn portion. If up to 5 turns are defined, the line width may be sequentially increased, such as "1 turn part <2 turn parts <3 turn parts <4 turn parts <5 turn parts". Of course, this is exemplary, and it is sufficient that the line width of at least 5 turns is greater than that of at least some of 1 to 4 turns.

In contrast, as shown in FIG. 9(b), when there are gaps G2 and G3 between the two outer lateral regions, as well as the gap G1 between the middle feet in the core portion 150, the coil portion around the corresponding portion The current density increases, and heat generation is relatively large. For example, when the planar coil part 100A according to the embodiment is applied, the gap between the inner diameter side and the outer foot (G2, G3) close to the middle gap G1 in each of the upper coil portion 120 and the lower coil portion 130A is applied. Both of the outer diameters near the side generate heat due to the greater current density than the central side. In order to solve this problem, the line width may be increased as the outer diameter side and the inner diameter side are closer to each of the upper coil portion 120 and the lower coil portion 130A. For example, as illustrated in FIG. 1B, when each of the upper coil portion 120 and the lower coil portion 130A forms 5 turns, each turn is divided from the outer diameter side to the inner diameter side from the 1 turn portion. If up to 5 turns are defined, the line width may be sequentially increased, such as "3 turns <2 turns <4 turns <1 turns <5 turns". Of course, this is exemplary, and it is sufficient that the line width of at least the 5 turn portion and the 1 turn portion is larger than the line width of the remaining turn portions.

On the other hand, as shown in (a) or (b) of FIG. 9, when a core having at least one gap is used, the heat generation of the coil unit increases as the gap approaches the vertical direction as well as the plane direction. For example, when the upper coil portion 151 and the lower coil portion 152 have symmetrical shapes, the inductors 200A illustrated in FIGS. 8A and 8B may include a plurality of planar coils 100A-1, 100A-2, Among the 100A-3), the planar coil 100A-2 positioned centrally in the thickness direction is closest to the gap. Therefore, it can be predicted that most heat is generated in the planar coil 100A-2. In order to alleviate such heat generation, lamination through parallel connection of planar coils according to embodiments may be considered. This will be described with reference to FIG. 10.

10 is an exploded perspective view showing another example of an inductor using a planar coil according to an embodiment.

The inductor 200B illustrated in FIG. 10 includes two planar coils 100A-2 and 100A in which planar coils 100A-2 positioned centrally in the thickness direction in the inductor 200A illustrated in FIGS. 8A and 8B are connected in parallel. The rest of the configuration is the same, except that it is replaced by -3).

The parallel connection has a form in which the two planar coils 100A-2 and 100A-3 are stacked in a form arranged to overlap each other in the thickness direction without shifting from each other around the hollow CH on the plane. Due to this stacked shape, the outer diameter side ends of the upper coil portions of the two planar coils 100A-2 and 100A-3 are electrically connected to each other by a pin 140, and the outer diameter side ends of the lower coil portion are also different. Since the pins 140 are electrically connected to each other, a parallel connection is made. As the two planar coils 100A-2 and 100A-3 located centrally in the thickness direction are connected in parallel to each other, the current density of the individual planar coils is substantially half, so that the gap disposed in the core portion 150 The heat generation problem caused by this can be reduced.

11 is an exploded perspective view showing an example of a transformer using a planar coil according to an embodiment.

Referring to FIG. 11, one sheet of planar coil 100A according to one embodiment and two sheets of planar coils 100B-1 and 100B-2 according to another embodiment are stacked and coupled with core 150 Transformer 300 is shown.

At this time, the planar coils 100A disposed on the upper side in the thickness direction correspond to the primary coils, and the planar coils 100B-1 and 100B-2 disposed on the middle and lower portions may correspond to the secondary coils.

At this time, the first connection portion of the two outer diameter side ends of the planar coil 100A corresponding to the primary side coil, and the first connection portion of each of the two planar coils 100B-1 and 100B-2 constituting the secondary side coil The core parts 150 may be disposed in opposite directions on a plane. Therefore, two terminals (1 ^st ) of the primary coil and three terminals of the secondary coil (that is, two signal terminals (2 ^nd -s1, 2 ^nd -s2) and one ground terminal (2 ^nd -G)) Even if pins are placed in the through-holes of all the connecting portions, they can be insulated from each other.

On the other hand, the two planar coils constituting the secondary coil (100B-1, 100B-2) have a series connection form with each other, but the serial connection between the two planar coils corresponds to the ground terminal 2nd-G), so the turn ratio of the secondary coil Becomes 5:5. At this time, the number of turns of the primary side coil is 10 turns, and the primary side: secondary side turn ratio may be 10:5 (or 10:5:5).

Description of each of the above-described embodiments may be applied to other embodiments as long as the contents do not conflict with each other.

The embodiments have been mainly described above, but this is merely an example and does not limit the present invention, and those skilled in the art to which the present invention pertains have not been exemplified above in a range that does not depart from the essential characteristics of this embodiment. It will be appreciated that various modifications and applications are possible. For example, the number of turns or the turns of the planar coils 100A, 100B, and 100C described above, the shape of the core portion 150, and the number and shape of the stacks of the magnetic elements 200A, 200B, 300 are all exemplary. It is apparent to those skilled in the art that all of these modifications fall within the scope of the present invention. And differences related to these modifications and applications should be construed as being included in the scope of the invention defined in the appended claims.

100A, 100B, 100C: flat coil
110: substrate portion
120: upper coil portion
130A, 130B: lower coil part
200A, 200B: Inductor
300: transformer

Claims (12)

It includes at least three planar coils stacked in the thickness direction,
Each of the at least three planar coils includes a substrate portion, an upper coil portion disposed on an upper surface of the substrate portion, a lower coil portion having a spiral plane shape, and a lower coil portion disposed on a lower surface of the substrate portion,
The substrate portion
A ring portion having a hollow defining an inner diameter and having an annular planar shape; And
It includes; a first connecting portion extending from the outer diameter side edge of the ring portion,
The outer diameter side end portion of the upper coil portion extends in a direction away from the hollow portion of the ring portion and is disposed on the upper surface of the first connection portion,
The outer diameter side end portion of the lower coil portion extends in a direction away from the hollow portion of the ring portion and is disposed on the lower surface of the first connection portion,
The first direction in which the outer diameter side end of the upper coil part extends and the second direction in which the outer diameter side end of the lower coil part extends form a predetermined angle with each other,
The hollow of each of the at least three planar coils overlaps each other in the thickness direction, and the coils for a magnetic element are stacked by being rotated in one direction by another predetermined planar coil adjacent to each other in the thickness direction. According to claim 1,
In each of the at least three planar coils,
The outer diameter side end portion of the upper coil portion and the outer diameter side end portion of the lower coil portion are spaced apart from each other in a plane and do not overlap with each other in the thickness direction. According to claim 1,
The substrate portion,
A coil for a magnetic element, further comprising a second connection portion extending from the outer peripheral side edge region facing the one edge region around the hollow in the ring portion. According to claim 1,
The predetermined angle is 5 to 30 degrees, the coil for a magnetic element. According to claim 1,
Each of the inner diameter side end of the upper coil portion and the inner diameter side end of the lower coil portion is at least partially overlapped in the thickness direction on a plane, and is electrically connected to each other through a through hole of the ring portion. According to claim 1,
Among the at least three planar coils, two planar coils adjacent to each other in the thickness direction,
A coil for a magnetic element, wherein the outer diameter side end of the upper coil portion disposed in one planar coil is electrically connected to the outer diameter side end of the lower coil portion disposed in the other planar coil portion. According to claim 1,
A coil for a magnetic element, having the same shape as each of the at least three planar coils, but further comprising a planar coil stacked on one of the at least three planar coils and overlapped with each other in the thickness direction. The method of claim 6,
The first connection portion has a plurality of through-holes, a coil for a magnetic element. The method of claim 8,
The plurality of through-holes, respectively, the outer diameter side end of the upper coil portion and the outer diameter side end of the lower coil portion, respectively, the coil for a magnetic element. The method of claim 9,
A coil for a magnetic element, wherein at least a portion of the plurality of through holes of the planar coil adjacent to the thickness direction overlap in the thickness direction. The method of claim 10,
It further includes at least one conduction unit,
A portion of each of the at least one conductive portion is disposed in a through hole overlapping in the thickness direction, and the other portion extends in the thickness direction and includes a region exposed to the outside. At least three planar coils stacked in the thickness direction; And
Including the core,
Each of the at least three planar coils includes a substrate portion, an upper coil portion disposed on an upper surface of the substrate portion, a lower coil portion having a spiral plane shape, and a lower coil portion disposed on a lower surface of the substrate portion,
The substrate portion
A ring portion having a hollow defining an inner diameter and having an annular planar shape; And
It includes; a first connecting portion extending from one edge of the outer diameter side of the ring portion,
The outer diameter side end portion of the upper coil portion extends in a direction away from the hollow portion of the ring portion and is disposed on the upper surface of the first connection portion,
The outer diameter side end portion of the lower coil portion extends in a direction away from the hollow portion of the ring portion and is disposed on the lower surface of the first connection portion,
The first direction in which the outer diameter side end of the upper coil part extends and the second direction in which the outer diameter side end of the lower coil part extends form a predetermined angle with each other,
The magnetic element of each of the at least three planar coils overlaps each other in the thickness direction, and is stacked by being rotated in one direction by another predetermined planar coil adjacent to each other in the thickness direction.

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