KR102816145B1 - Flat coil unit and wireless power transfer module including the same - Google Patents

Abstract

A flat coil unit is provided. According to one embodiment of the present invention, the flat coil unit may include: a coil body in which a conductive member having a predetermined length is wound multiple times in one direction so as to form a hollow space having a predetermined area in the central portion, and which includes first and second surfaces which are opposite surfaces; a first lead wire extending from one end of the conductive member so as to protrude outwardly from an outer edge of the coil body by a predetermined length without overlapping the coil body; a second lead wire extending from the other end of the conductive member so as to cross the first surface of the coil body from an inner edge of the coil body; and a loosening and short-circuit prevention member attached to the coil body so as to prevent loosening of the conductive member constituting the coil body and prevent electrical shorting between the second lead wire and the coil body.

Description

Flat coil unit and wireless power transfer module including the same {Flat coil unit and wireless power transfer module including the same}

The present invention relates to a flat coil unit and a wireless power transmission module including the same.

A flat coil is a conductive material having a predetermined length wound multiple times in one direction, and is used to implement inductance in electrical and electronic machines. That is, when current flows through a flat coil, a magnetic flux is generated, promoting electromagnetic induction or electromagnetic force.

In addition, since the flat coil has inductance, when combined with a capacitor, it exhibits resonance characteristics at a certain frequency.

These flat coils are used in instruments, motors, generators, transformers, tuning circuits, filters, speakers, induction, etc. In addition, the flat coils are also used as antenna units for wireless communication or wireless power transmission.

In such a flat coil, the coil body is formed into a shape such as a circle, an oval, a square, etc. by winding a conductive member having a predetermined length in a size and number of turns appropriate to the purpose, and a pair of lead wires for electrical connection with other components such as a circuit board are drawn out from the coil body by a predetermined length, and one of the lead wires of the pair is arranged to protrude outward from the coil body by a predetermined length while crossing the coil body.

At this time, the conductive member constituting the coil body is pressurized or heated and then wound multiple times in one direction to form a coil body having a shape such as a circle, an oval, a square, etc.

Accordingly, there is a problem that the insulating layer covering the conductive member to prevent electrical shorts with other components may be damaged or have its performance deteriorated by pressure or heat during the pressurizing or heating process.

In addition, conventional flat coils have adhesive applied to the coil body to prevent the conductive member constituting the coil body from loosening. However, if the flat coil is exposed to a high temperature environment or repeatedly exposed to heat generated during operation, there is a problem in that the performance of the adhesive deteriorates or deteriorates, resulting in a decrease in the winding density of the coil body.

The present invention has been made in consideration of the above points, and its purpose is to provide a flat coil unit capable of preventing a conductive member wound with a predetermined number of turns from unwinding while also preventing the possibility of a short circuit due to physical contact, and a wireless power transmission module including the same.

In order to solve the above-described problem, the present invention provides a flat coil unit including a coil body having a plurality of turns of a conductive member having a predetermined length in one direction so as to form a hollow space having a predetermined area in the central portion, and having first and second surfaces which are opposite surfaces; a first lead wire extending from one end of the conductive member so as to protrude outwardly from an outer edge of the coil body by a predetermined length without overlapping the coil body; a second lead wire extending from the other end of the conductive member so as to cross the first surface of the coil body from the inner edge of the coil body; and a loosening and short-circuit prevention member attached to the coil body so as to prevent loosening of the conductive member constituting the coil body and prevent electrical shorting between the second lead wire and the coil body.

In addition, the loosening and short-circuit prevention member may include a first part attached to the first surface, a second part attached to the second surface, and a third part connecting the first part and the second part and wrapping the inner surface of the coil body, and the second lead wire may be arranged such that one end extending from the coil body is positioned in the inner area of the loosening and short-circuit prevention member.

In addition, the release and short-circuit prevention member may include a cut portion formed to be positioned corresponding to the inner surface of the coil body, and the second lead wire may extend from the inner edge of the coil body such that one end extending from the coil body is positioned within the cut portion.

For example, the cut portion may be formed in the third portion so as to extend inwardly along the inner surface of the coil body from one end of the third portion to a certain length.

As another example, the cut portion may be formed in the second and third portions so as to extend inwardly from one end of the second and third portions by a certain length.

In addition, the first portion may be provided to have a shape corresponding to the first surface of the coil body and an area covering the entire width of the coil body, and the second portion may be provided to have a shape corresponding to the second surface of the coil body and an area covering the entire width of the coil body.

In addition, the release and short-circuit prevention member may further include an extension portion extending from an end of the first portion so as to be able to wrap around an outer surface of the coil body.

In addition, the release and short-circuit prevention member may be an adhesive member including a plate-shaped film member and an adhesive layer formed on one surface of the film member.

Additionally, the film member may be made of a material having insulating properties.

Meanwhile, the present invention provides a wireless power transmission module including an antenna unit for transmitting or receiving wireless power; and a magnetic field shielding sheet arranged on one surface of the antenna unit so as to shield a magnetic field; wherein the antenna unit is the flat coil unit described above.

According to the present invention, it is possible to prevent the conductive member constituting the coil body from loosening, while also preventing the possibility of a short circuit due to physical contact between the coil body and the lead wire. Through this, the present invention can secure reliability while maintaining the performance of the initial design value.

Figure 1 is a drawing showing a flat coil unit according to one embodiment of the present invention.
Figure 2 is a drawing of Figure 1 viewed from the bottom.
Figure 3 is a drawing of Figure 1 viewed from a different direction;
Figure 4 is a drawing of the release and short-circuit prevention member separated from the coil body in Figure 1.
Figure 5 is an enlarged drawing of part “A” in Figure 1.
Figure 6 is an enlarged drawing of part “B” in Figure 2.
Fig. 7 is a drawing showing the state in which the release and short-circuit prevention member of Fig. 1 is unfolded.
Fig. 8 is a drawing showing a state in which a different type of release and short-circuit prevention member is applied in Fig. 5.
Figure 9 is a drawing of Figure 8 viewed from the bottom.
Fig. 10 is a drawing showing the state in which the release and short-circuit prevention member of Fig. 8 and Fig. 9 is unfolded.
Figure 11 is a drawing showing a state in which another type of release and short-circuit prevention member is applied in Figure 5.
Figure 12 is a cross-sectional view of Figure 11, (a) is a cross-sectional view in the AA direction, and (b) is a cross-sectional view in the BB direction.
FIG. 13 is a drawing showing a case where the coil body is formed in a square shape in a flat coil unit according to one embodiment of the present invention, and
FIG. 14 is a drawing showing a wireless power transmission module according to one embodiment of the present invention.

Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice the present invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein. In the drawings, parts that are not related to the description are omitted in order to clearly describe the present invention, and the same reference numerals are added to the same or similar components throughout the specification.

A flat coil unit (100) according to one embodiment of the present invention includes a coil body (110), a first lead wire (120), a second lead wire (130), and a loosening and short-circuit prevention member (140, 240, 340) as shown in FIGS. 1 to 4.

The above coil body (110) may be formed by winding a conductive member having a certain length multiple times in one direction, and may implement inductance in electric and electronic machines by generating magnetic flux when current flows.

In the present invention, the conductive member may be made of a conductive metal material such as copper, and may be made of a single strand having a predetermined diameter or may be made of a plurality of strands twisted along the longitudinal direction.

A coil body (110) like this may be provided in the form of a flat plate having a hollow space (114) having a predetermined area formed in the central portion. That is, the coil body (110) may be provided in the form of a plate having a first surface (112a) and a second surface (112b) which are opposite surfaces to each other.

At this time, the coil body (110) may be provided with a conductive member having a predetermined length wound clockwise or counterclockwise to have a polygonal shape such as a circle, an oval, or a square.

For example, the coil body (110) may be provided in a circular shape with a hollow space (114) formed in the central portion as shown in FIGS. 1 to 4, or may be provided in a rectangular shape with a hollow space (114) formed in the central portion as shown in FIG. 13.

The above first lead wire (120) and second lead wire (130) may serve as input/output terminals that apply power supplied from the outside to the coil body (110).

The first lead wire (120) and the second lead wire (130) can electrically connect the coil body (110) to other components such as a circuit board (not shown).

For this purpose, the first lead wire (120) and the second lead wire (130) can be extended from the coil body (110) by a certain length.

For example, the first lead wire (120) may be extended from one end of the conductive member (C) constituting the coil body (110) so as to protrude outwardly from the outer edge of the coil body (110) by a certain length without overlapping with the coil body (110).

In addition, the second lead wire (130) may extend from one end of the conductive member (C) constituting the coil body (110) to cross the first surface (112a) of the coil body (110) from the inner edge of the coil body (110).

Here, the first lead wire (120) and the second lead wire (130) may each be provided as separate members, but may be a portion corresponding to a length including both ends of the conductive member constituting the coil body (110).

That is, the coil body (110), the first lead wire (120) and the second lead wire (130) can be formed through one conductive member having a predetermined length.

The above-mentioned loosening and short-circuit prevention member (140, 240, 340) can be attached to the coil body (110).

To this end, the above-mentioned loosening and short-circuit prevention member (140, 240, 340) may include a plate-shaped film member (140a) having a predetermined area as shown in the enlarged view of Fig. 4 and an adhesive layer (140b) formed on one surface of the film member (140a).

At this time, the film member (140a) may be made of a material having insulating properties. For example, the film member (140a) may be a known PI film. However, the material of the film member (140a) is not limited thereto, and various known materials may be used without limitation as long as they have insulating properties and can be implemented in a plate shape.

Such loosening and short-circuit prevention members (140, 240, 340) may be provided to cover the first surface (112a), the second surface (112b), and the inner surface of the coil body (110).

For example, the release and short-circuit prevention member (140, 240, 340) may include a first part (141) attached to the first surface (112a), a second part (142) attached to the second surface (112b), and a third part (143) that surrounds the inner surface of the coil body (110) while connecting the first part (141) and the second part (142).

Here, the first part (141) may be provided to have a shape corresponding to the first surface (112a) of the coil body (110), and the second part (142) may be provided to have a shape corresponding to the second surface (112b) of the coil body (110).

In addition, the first part (141) may be provided to have an area corresponding to a portion of the total area of the first surface (112a), and the second part (142) may be provided to have an area corresponding to a portion of the total area of the second surface (112b).

In addition, the first part (141) and the second part (142) may be provided to have an area covering the entire width of the coil body (110).

Accordingly, when the loosening and short-circuit prevention member (140, 240, 340) is attached to the coil body (110) through the adhesive layer (140b), the first part (141) and the second part (142) can be attached to the first surface (112a) and the second surface (112b), respectively, so as to cover the entire width of the coil body (110), and the loosening and short-circuit prevention member (140, 240, 340) can cover a portion of the first surface (112a), a portion of the second surface (112b), and a portion of the inner surface of the coil body (110).

Through this, the conductive member wound multiple times while forming the coil body (110) can be fixed in position through the adhesive layer (140b) of the first part (141) and the second part (142).

Due to this, the above-mentioned loosening and short-circuit prevention member (140, 240, 340) can be wound multiple times to prevent the conductive member constituting the coil body (110) from loosening.

At this time, the second lead wire (130) may be positioned on one side of the first portion (141) on the first surface (112a) and may be arranged to cross the coil body (110).

Accordingly, when the loosening and short-circuit prevention member (140, 240, 340) is attached to the coil body (110), the loosening and short-circuit prevention member (140, 240, 340) is wound multiple times to prevent loosening of the conductive member constituting the coil body (110), while blocking physical contact between the second lead wire (130) and the coil body (110).

Through this, even if the conductive member constituting the coil body (110) and the insulating layer (not shown) covering the surface of the second lead wire (130) are damaged or the insulating performance is reduced, the loosening and short-circuit prevention member (140, 240, 340) can block physical contact between the second lead wire (130) and the coil body (110), thereby preventing an electrical short between the coil body (110) and the second lead wire (130).

That is, in the flat coil unit (100) according to one embodiment of the present invention, the loosening and short-circuit prevention member (140, 240, 340) can prevent loosening of the conductive member constituting the coil body (110) while also preventing in advance the possibility of a short circuit due to physical contact between the coil body (110) and the second lead wire (130).

Due to this, the flat coil unit (100) according to one embodiment of the present invention can secure reliability while maintaining the performance of the initial design value.

At this time, the second lead wire (130) may be positioned so that one end extending from the coil body (110) is located in the inner area of the release and short-circuit prevention member (140, 240, 340).

That is, the second lead wire (130) may be arranged to cross the coil body (110) while being placed on one side of the first surface (112a), and one end extending from the coil body (110) may be arranged to be located in the inner area of the loosening and short-circuit prevention member (140, 240, 340).

Through this, the flat coil unit (100) according to one embodiment of the present invention can completely block physical contact between the first surface (112a) of the coil body (110) and the second lead wire (130).

In addition, the flat coil unit (100) according to one embodiment of the present invention can be implemented so that one end of the second lead wire (130) extending from the coil body (110) is positioned in the inner area of the loosening and short-circuit prevention member (140, 240, 340), while the loosening and short-circuit prevention member (140, 240, 340) can be easily attached to the coil body (110).

To this end, the release and short-circuit prevention member (140, 240, 340) may include a cut portion (144, 244) formed at a position corresponding to the inner surface of the coil body (110).

For example, the cut portion (144, 244) may be formed in the third portion (143) such that it extends inwardly along the inner surface of the coil body (110) from one end of the third portion (143) that surrounds the inner surface of the coil body (110) to a certain length, as shown in FIGS. 5 to 7.

As another example, the cut portion (144, 244) may be formed in the second portion (142) and the third portion (143) so as to extend inwardly from one end of the second portion (142) and the third portion (143) by a certain length, as shown in FIGS. 8 to 10.

Through this, the second lead wire (130) can be extended from the inner edge of the coil body (110) so that one end extending from the coil body (110) is positioned within the cut portion (144, 244), and the second lead wire (130) can be positioned so as to be positioned on one side of the first surface (112a).

Accordingly, in the flat coil unit (100) according to one embodiment of the present invention, even if one end of the second lead wire (130) extending from the coil body (110) is positioned in the inner area of the loosening and short-circuit prevention member (140, 240, 340) extending from the inner edge of the coil body (110), the loosening and short-circuit prevention member (140, 240, 340) can be easily attached to the coil body (110), and the second lead wire (130) can be prevented from direct contact with the first surface (112a) of the coil body (110) through the first portion (141).

Meanwhile, the above-mentioned loosening and short-circuit prevention member (140, 240, 340) may be provided to cover not only the inner surface, the first surface (112a), and the second surface (112b) of the coil body (110), but also the outer surface of the coil body (110).

To this end, the release and short-circuit prevention member (140, 240, 340) may include an extension portion (145) extending from the first portion (141) as shown in FIGS. 11 and 12.

Accordingly, when the loosening and short-circuit prevention member (140, 240, 340) is attached to the coil body (110), the loosening and short-circuit prevention member (140, 240, 340) can cover a portion of the first surface (112a), a portion of the second surface (112b), a portion of the inner surface, and a portion of the outer surface of the coil body (110).

Due to this, the release and short-circuit prevention member (140, 240, 340) can more effectively prevent the conductive member constituting the coil body (110) from being released, while also blocking the second lead wire (130) from physically contacting the first surface (112a), the second surface (112b), and the outer surface of the coil body (110).

In this case, one end of the extension portion (145) can be directly attached to the second portion (142).

In the drawing, the extension portion (145) is shown as being applied to the loosening and short-circuit prevention members (140, 240, 340) shown in FIGS. 5 to 7, but the present invention is not limited thereto, and the extension portion (145) may also be applied to the loosening and short-circuit prevention members (140, 240, 340) shown in FIGS. 8 to 10.

Meanwhile, a flat coil unit (100) according to one embodiment of the present invention can be implemented as a wireless power transmission module (1000) for receiving or transmitting wireless power.

That is, a wireless power transmission module (1000) according to one embodiment of the present invention may include an antenna unit (1100) for transmitting or receiving wireless power as illustrated in FIG. 14, and a magnetic field shielding sheet (1200) arranged on one surface of the antenna unit (1100) to shield a magnetic field, and the antenna unit (1100) may be fixed to one surface of the magnetic field shielding sheet (1200) using an adhesive layer (not illustrated).

An antenna unit (1100) of this type can perform the role of a transmitting coil (Tx coil) that wirelessly charges the battery of an electronic device, such as a portable terminal, by transmitting a wireless power signal to the electronic device using an inductive coupling method or a magnetic resonance method based on an electromagnetic induction phenomenon.

In addition, the antenna unit (1100) may also perform the role of a receiving coil (Rx coil) that receives a wireless power signal transmitted from a charging device such as a wireless charger using an inductive coupling method or a magnetic resonance method based on an electromagnetic induction phenomenon.

Accordingly, when the antenna unit (1100) operates as a transmitting coil, the wireless power transmission module (1000) according to one embodiment of the present invention may be a wireless power transmitting module, and when the antenna unit (1100) operates as a receiving coil, the wireless power transmission module (1000) according to one embodiment of the present invention may be a wireless power receiving module.

Here, the antenna unit (1100) can be applied with the flat coil unit (100) described above.

The above magnetic field shielding sheet (1200) can improve the performance of the antenna unit (1100) operating in a predetermined frequency band by shielding the magnetic field as described above.

To this end, the magnetic shielding sheet (1200) may be made of a material having magnetism so as to shield a magnetic field.

For example, the magnetic field shielding sheet (1200) may be a ferrite sheet, a ribbon sheet of an amorphous alloy or nano-crystalline alloy, a polymer sheet, etc.

In addition, the magnetic field shielding sheet (1200) may be a multilayer sheet in which a plurality of magnetic sheets are laminated in multiple layers via adhesive layers, or may be a sheet formed by separating into a plurality of pieces so as to suppress the generation of eddy currents.

Since this magnetic field shielding sheet (1200) is publicly known, a detailed description will be omitted.

Although one embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiment presented in this specification, and those skilled in the art who understand the spirit of the present invention will be able to easily suggest other embodiments by adding, changing, deleting, or adding components within the scope of the same spirit, but this will also be considered to fall within the spirit of the present invention.

100: Flat coil unit C: Conductive member
110: Coil body 112a: First side
112b: Page 2 114: Blank space
120: First lead line 130: Second lead line
140,240,340: Loosening and short-circuit prevention member 140a: Film member
140b: Adhesive layer 141: Part 1
142: Part 2 143: Part 3
144,244 : Incision 145 : Extension
1000: Wireless power transmission module 1100: Antenna unit
1200 : Magnetic shielding sheet

Claims (10)

A coil body including a first surface and a second surface, which are opposite surfaces, and a conductive member having a predetermined length wound multiple times in one direction so that a hollow space having a predetermined area is formed in the central portion;
A first lead wire extending from one end of the conductive member so as to protrude outwardly from the outer edge of the coil body by a certain length without overlapping with the coil body;
A second lead wire extending from the other end of the conductive member across the first surface of the coil body from the inner edge of the coil body; and
A flat coil unit including a loosening and short-circuit prevention member attached to the coil body to prevent loosening of the conductive member constituting the coil body and prevent electrical shorting between the second lead wire and the coil body. In the first paragraph,
The above loosening and short-circuit prevention member is,
It includes a first part attached to the first surface, a second part attached to the second surface, and a third part that surrounds the inner surface of the coil body while connecting the first part and the second part.
The above second lead wire is a flat coil unit in which one end extending from the coil body is positioned in the inner area of the release and short-circuit prevention member. In the second paragraph,
The above loosening and short-circuit prevention member is,
It includes a cut portion formed to be positioned corresponding to the inner surface of the coil body,
The above second lead wire is a flat coil unit extending from the inner edge of the coil body so that one end extending from the coil body is positioned within the cut portion. In the third paragraph,
A flat coil unit in which the above-mentioned cut portion is formed in the third portion so as to extend inward along the inner surface of the coil body from one end of the third portion to a certain length. In the third paragraph,
A flat coil unit formed in the second and third parts so that the above-mentioned cut portion is inserted inwardly from one end of the second and third parts by a certain length. In the second paragraph,
The above first part is provided with a shape corresponding to the first surface of the coil body and an area covering the entire width of the coil body,
A flat coil unit in which the second part has a shape corresponding to the second surface of the coil body and an area covering the entire width of the coil body. In the second paragraph,
The above loosening and short-circuit prevention member is,
A flat coil unit further including an extension portion extending from an end of the first portion so as to be able to wrap around an outer surface of the coil body. In the first paragraph,
The above loosening and short-circuit prevention member is,
A flat coil unit comprising a plate-shaped film member and an adhesive member including an adhesive layer formed on one surface of the film member. In Article 8,
The above film member is a flat coil unit made of an insulating material. An antenna unit for transmitting or receiving wireless power; and
A magnetic field shielding sheet is disposed on one side of the antenna unit so as to shield a magnetic field;
The above antenna unit is a wireless power transmission module which is a flat coil unit as described in any one of claims 1 to 9.

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