KR20220119221A - Wireless power receiving apparatus and wireless power transmitting/receiving system having the same - Google Patents

Abstract

The present invention relates to a wireless power receiving apparatus for wirelessly receiving power and a wireless power transmitting/receiving system including the same. Provided are a wireless power receiving apparatus which can improve the efficiency of wireless power reception by increasing the degree of freedom of reception in a wireless power space as well as can increase the amount of flux linkage, and a wireless power transmitting/receiving system including the same.

Description

Wireless power receiving device and wireless power transmitting/receiving system including same

The present invention relates to a wireless power receiving apparatus for wirelessly receiving power and a wireless power transmitting/receiving system including the same.

Wireless power transmission/reception technology is a technology that wirelessly supplies power to electric and electronic devices, and is being developed in various forms to improve the convenience of power transmission. and devices that must ensure safety from electric shock, specifically electric toothbrushes and cordless electric shavers. Such wireless charging technology is gradually expanding not only to small electronic devices, but also to products that focus on user's mobility along with mobile communication technology such as smartphones, DMBs, and tablet PCs, and further attempts to apply it to industrial sites or medical technology is also appearing.

There are three types of wireless charging methods: magnetic induction, magnetic resonance (resonance), and electromagnetic wave, but in general, they are divided into magnetic induction and magnetic resonance. All of the currently commercialized wireless charging technologies are magnetic induction, which is a technology using the electromagnetic induction principle in which a magnetic field is generated in the transmitting coil of the power transmitting device, and this magnetic field is induced in the secondary coil of the receiving device to supply current. The magnetic induction method has the advantage of very high power transmission efficiency of 90% or more, but there is a problem that the efficiency is rapidly reduced to the extent that almost no power is transmitted if it is dropped by more than a few cm or the centers of the transmitting coil and the receiving coil do not exactly match. .

Specifically, when a magnet is moved near a closed circuit (for example, a coil, etc.) or the magnetic field is changed using another circuit through which current flows, the closed circuit acts to cancel the magnetic field. This is called induced current. Wireless charging is a technology that uses this electromagnetic induction phenomenon.

Conventionally, in such a wireless power transmission/reception system, it is common to configure a transmission device and a reception device using only a coil. In the magnetic flux generated by the transmitting device having such a structure, when the distance between the transmitting device and the receiving device, that is, the power transmission distance increases, the magnetic flux linkage of the receiving device, which determines the size of power, decreases.

According to the prior art, since the transmission system is constructed using only coils, if the distance from the coil of the transmitting device to the coil of the receiving device increases even a little, the distance dependence of induced power such as the amount of magnetic flux linkage acting on the coil of the receiving device sharply decreases. Since is too large, there was a problem that in fact, the inconvenience of wired charging could not be greatly improved.

In addition, an electric/electronic device receiving wireless power should be able to receive power anywhere in the wireless power space regardless of the direction of the transmitting device or receiving device. In the prior art, the transmitting device and the receiving device are not aligned In this case, there was a problem that the reception efficiency was low.

Korean Patent Registration No. KR10-1595774 (registered on February 15, 2016) Composite coil module for wireless power transmission

The present invention is to solve the above problems, and an object of the present invention is to not only increase the magnetic flux linkage by additionally providing a core inside the coil of the wireless power receiving device, but also to provide the entire coil of the receiving device. It is an object to provide a wireless power receiving device capable of improving the reception freedom of the receiving device by implementing it in a direction and a wireless power transmitting/receiving system including the same.

The wireless power receiver according to an embodiment of the present invention may include a core made of a magnetic material, and a coil made of a conductive material for winding the outer periphery of the core.

In this case, the core may be formed in a hexahedral shape, and the coil may form a closed loop passing through regions corresponding to all corners of the core.

In addition, the coils wound on the same surface of the core are connected in series, and the coil has a region corresponding to a pair of edges parallel to each other of the core and a region corresponding to a diagonal line connecting the pair of edges of the core. It may be formed to pass through.

The direction of the current flowing through the pair of coils for winding regions corresponding to the pair of corners parallel to each other of the core may be formed to be the same.

The coil may be wound with a plurality of turns, and the number of turns of the coil may be four.

On the other hand, the core is formed in the form of a first core block formed in a plate shape, a plate shape, a second core block vertically protruding to pass through the center of the first core block, and a plate shape, and the first core A third core block that passes through the center of the block and vertically protrudes to be perpendicular to the second core block, wherein the coil includes a first coil wound along an outer periphery of the first core block, and an outer periphery of the second core block. It may include a second coil wound along and a third coil wound along the outer periphery of the third core block.

In this case, the first core block may have a square cross-section, and the second core block and the third core block may have the same area and each cross-section may be formed in a rectangular shape.

Meanwhile, the first coil may form a closed loop in a square shape, and the second coil and the third coil may each form a closed loop in a rectangular shape.

In this case, each of the first coil, the second coil, and the third coil may be wound with a plurality of turns.

Also, the first coil, the second coil, and the third coil may be connected in series.

A wireless power transmission/reception system according to another embodiment of the present invention includes a wireless power transmission device for wirelessly transmitting power and a wireless power reception device for wirelessly receiving power transmitted from the wireless power transmission device, wherein the wireless power The receiving device may include a core made of a magnetic material, and a coil made of a conductive material for winding the outer periphery of the core.

In this case, in the wireless power receiver, the core may be formed in a hexahedral shape, and the coil may form a closed loop passing through regions corresponding to all corners of the core.

In this case, the core is formed in the form of a first core block formed in a plate shape, a plate shape, and a second core block vertically protruding to pass through the center of the first core block and a plate shape, and the first core and a third core block that passes through the center of the block and vertically protrudes to be perpendicular to the second core block, wherein the coil includes a first coil wound along an outer periphery of the first core block, and an outer periphery of the second core block It may include a second coil wound along and a third coil wound along the outer periphery of the third core block.

On the other hand, the wireless power transmitter, a fourth core block formed in a disk shape, formed in a disk shape, and formed in a fifth core block orthogonal to the fourth core block, a disk shape, the fourth core block and A sixth core block orthogonal to the fifth core block and sharing a center with the fourth core block and the fourth core block, a fourth coil wound along the outer periphery of the fourth core block, and the outer periphery of the fifth core block It may include a fifth coil orthogonal to the fourth coil and a sixth coil wound along the outer periphery of the sixth core block, and orthogonal to the fourth coil and the fifth coil.

According to a wireless power transmission/reception system including a wireless power reception device according to embodiments of the present invention, the efficiency of wireless power reception can be improved by not only increasing the flux linkage, but also improving the reception freedom within the wireless power space. can

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

1 is a perspective view of an apparatus for receiving wireless power according to an embodiment of the present invention.
2 is a perspective view of a wireless power receiver according to a modified example of an embodiment of the present invention, and FIG. 3 is a plan view of a core block constituting the wireless power receiver according to the present invention.
4 is a perspective view of a wireless power transmission device constituting a wireless power transmission/reception system according to another embodiment of the present invention.
5 and 6 are circuit diagrams illustrating a state in which power is transmitted/received by a wireless power transmission/reception system according to another embodiment of the present invention.

Since the present invention can apply various transformations and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail in the detailed description. 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.

In describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, numbers (eg, first, second, etc.) used in the description process of the present specification are merely identification symbols for distinguishing one component from other components.

In addition, throughout the specification, when an element is referred to as "connected" or "connected" with another element, the one element may be directly connected or directly connected to the other element, but in particular It should be understood that, unless there is a description to the contrary, it may be connected or connected through another element in the middle.

In addition, throughout the specification, when a part "includes" a certain component, this means that other components may be further included, rather than excluding other components, unless otherwise stated. In addition, terms such as "unit" and "module" described in the specification mean a unit that processes at least one function or operation, which means that it can be implemented as one or more hardware or software or a combination of hardware and software. .

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and examples taken in conjunction with the accompanying drawings. In the present specification, in adding reference numbers to the components of each drawing, it should be noted that only the same components are given the same number as possible even though they are indicated on different drawings. Also, terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings, and FIG. 1 is a perspective view of a wireless power receiving apparatus 10 according to an embodiment of the present invention.

The wireless power receiver 10 according to the present invention wirelessly receives power transmitted from a wireless power transmitter that wirelessly transmits power, and includes a core 110 and a coil 130 wound around the core 110 . may include

The wireless power system including the wireless power receiver 10 according to the present embodiment may be used in mobile devices such as mobile phones and laptop computers and electronic products such as robot cleaners and electric toothbrushes to wirelessly charge power.

The core 110 may be formed of a magnetic material. Specifically, the core 110 may include a magnetic ferrite material. In this case, the core 110 may be formed of a single material, such as a ferrite sintered body, or a composite material formed by mixing ferrite powder with other magnetic metal powder and molding it by a method such as extrusion, pressing, or casting. The core 110 is an object with high magnetic permeability and is disposed inside the coil 130 to be described later to narrow the distance between the lines of magnetic force to increase the magnetic flux density so that a stronger magnetic field and a larger current are induced in the coil 130 .

Meanwhile, the core 110 may be formed in a hexahedral shape. Referring to Figure 1, the core 110 is X ₁ , Y ₁ A first surface of a square is formed on the plane, Z 1 is spaced apart from the first surface in the Z ₁ axis direction to form a second surface of the square, the first surface And the third to sixth surfaces of the rectangle along the outer periphery of the second surface are formed to fill the space.

The coil 130 is formed of a conductive material, and may be formed to wind the outer periphery of the core 110 .

In this case, the coil 130 may be wound to form a closed loop while passing through regions corresponding to all corners of the core 110 . Referring to FIG. 1 , the conductive coil 130 is formed to pass through an area corresponding to all corners of the cube-shaped core 110, and since the cube has 12 corners, the conductive coil 130 corresponds to the 12 corners. formed to pass through the At this time, the coil 130 for winding the area corresponding to all the corners may be connected in series, and in order to connect the coil 130 in series, the coil is also in the area corresponding to the diagonal connecting a pair of parallel corners spaced apart from each other. 130 may be wound.

형으로 형성될 수 있으며,

의 코일(130) 시작지점과 종료지점에서 코어(110)의 수직 모서리를 따라 수직 방향의 코일(130)이 위치할 수 있다. 이와 같은 코일(130) 권취 형상에 의해 서로 평행하는 한 쌍의 코일(130)에 흐르는 전류의 방향이 동일하게 되며, 코어(110)의 한 면에 위치하는 상부 코일(130) 및 하부 코일(130)에 흐르는 전류의 방향이 동일하게 형성됨으로써 결과적으로 코일(130)에 통과 가능한 자속을 증가시킬 수 있다.Referring to the partially enlarged view of FIG. 1 , a pair of coils 130 is positioned in an area corresponding to a pair of corners of the third to sixth sides of the rectangle, and diagonal lines are arranged to connect the pair of coils 130 . The coil 130 is positioned in the direction

can be formed in the form

The coil 130 in the vertical direction may be located along the vertical edge of the core 110 at the starting point and the ending point of the coil 130 . Due to the winding shape of the coil 130 , the direction of the current flowing in the pair of coils 130 parallel to each other is the same, and the upper coil 130 and the lower coil 130 located on one side of the core 110 . ) is formed in the same direction as the current flowing through the coil 130 , as a result, it is possible to increase the magnetic flux passing through the coil 130 .

As described above, the coil 130 is formed to wind all corners of the hexahedral core 110, thereby increasing the degree of freedom in the reception direction, and the location of the coil 130 of the wireless power transmission device 30 and the wireless power reception device to be described later. Even in a state where the position of the coil 130 of (10) is not aligned, stable reception is possible, so that reception efficiency can be maintained.

In this case, the coil 130 may be wound with a plurality of turns, and the coil 130 positioned in an area corresponding to the same corner of the core 110 may be wound four times to be parallel to each other.

As the number of turns of the coil 130 to be wound increases, the reception efficiency of the wireless power receiving apparatus may be improved.

2 is a perspective view of a wireless power receiver 10 according to a modified example of an embodiment of the present invention, and FIG. 3 is a plan view of a block of the core 210 constituting the wireless power receiver 10 according to the present invention.

According to the present embodiment, the core includes the first core block 211 , the second core block 213 , and the third core block 215 , and the coil wound around the core includes the first coil 231 and the second coil 233 . ), a third coil 235 may be included.

The first core block 211 may be formed in the form of a plate having a constant height and positioned on the X ₂ , Y ₂ plane. At this time, the first core block 211 may be formed in a square shape in cross section, and the center of the square first core block 211 may be formed to locate the origin of the X ₂ , Y ₂ , Z ₂ coordinate system. .

The second core block 213 may be formed in a plate shape having a constant height, vertically protrude to pass through the center of the first core block 211 , and may be located on the Y ₂ , Z ₂ plane passing through the origin of the coordinate system. In this case, the second core block 213 may have a rectangular cross-section. In addition, the length of one side of the first core block 211 in the square shape is equal to the length of the long side of the second core block 213 in the rectangular shape, and the area of the second core block 213 is equal to the length of the first core block ( 211) may be formed to correspond to 1/2 of the area.

The third core block 215 may be formed in a plate shape having a constant height, vertically protrude to pass through the center of the first core block 211 , and may be located on the X ₂ , Z ₂ plane passing through the origin of the coordinate system. In this case, the third core block 215 may have a rectangular cross-section, and the third core block 215 may vertically protrude to be perpendicular to the second core block 213 . In addition, the length of one side of the first core block 211 of the square shape is equal to the length of the long side of the third core block 215 of the rectangular shape, and the area of the third core block 215 is equal to the length of the first core block ( 211) may be formed to correspond to 1/2 of the area. In this case, the area of the third core block 215 and the area of the second core block 213 may be formed to be the same.

In this case, the core may be formed of a magnetic material. Specifically, the core may include a magnetic ferrite material. In this case, the core may be formed of a single material, such as a ferrite sintered body, or a composite material formed by mixing ferrite powder with other magnetic metal powder and molding it by methods such as extrusion, pressing, casting, or the like. The core is an object with high magnetic permeability and is disposed inside the coil, which will be described later, to increase the magnetic flux density by narrowing the distance between the magnetic force lines so that a stronger magnetic field and a larger current are induced in the coil.

2 and 3 , the first coil 231 is wound along the outer periphery of the first core block 211 , and the second coil 233 is wound along the outer periphery of the second core block 213 , , the third coil 235 may be wound along the outer periphery of the third core block 215 .

Specifically, the first coil 231 is formed of a conductive material, is wound in a square shape along the outer periphery of the first core block 211, is positioned on the X ₂ , Y ₂ plane, and the first coil 231 is wound. may form a closed loop. The second coil 233 is formed of a conductive material, is wound in a rectangular shape along the outer periphery of the second core block 213 and is located on the Y ₂ , Z ₂ plane, and the wound second coil 233 is a closed loop. can form. The third coil 235 is formed of a conductive material, is wound in a rectangular shape along the outer periphery of the second core block 213 and is positioned on the X ₂ , Z ₂ plane, and the wound third coil 235 is a closed loop. can form. At this time, the first coil 231 , the second coil 233 , and the third coil 235 may be wound with a plurality of turns, and the first coil 231 , the second coil 233 , and the third coil ( 235) each can be connected in series.

Here, that the coil is formed on a certain plane does not mean that the shape of the coil is flat enough to be formed on a plane, but means that the wound coil is substantially parallel to the corresponding plane.

In this way, the rectangular core blocks 211 , 213 , and 215 are arranged to be orthogonal to each other, and the coils 231 , 233 , 235 wind the outer periphery of each core block to configure a wireless power receiving device, so the degree of freedom in the reception direction. can be increased, and stable reception is possible even in a state where the coil position of the wireless power transmitter and the coil position of the wireless power receiver are not aligned, so that reception efficiency can be maintained.

Meanwhile, a wireless power transmission/reception system according to another embodiment of the present invention may include a wireless power transmission device 30 and a wireless power reception device 10 .

The wireless power transmission/reception system may include a wireless power transmission device 30 including a reception directional structure and a wireless power reception device 10 for generating an induced current due to the wireless power transmission device 30, and wireless power transmission A transmission space may be created between the device 30 and the wireless power receiving device 10 .

In general, the wireless power receiving device 10 may be a target of wireless charging, such as a charging unit of a mobile device or an electronic product.

The wireless power transmitter 30 includes a fourth core block 311 , a fifth core block 313 , and a sixth core block 315 , and a fourth coil 331 wound around the core 210 block, respectively. ), a fifth coil 333 , and a sixth coil 335 may be included.

A fourth core block 311, a fifth core block 313, including a fourth coil 331, a fifth coil 333, and a sixth coil 335, each of which is formed in a disk shape therein; and a sixth core block 315 . The fourth coil 331 is formed on the Y ₃ , Z ₃ plane, the fifth coil 333 is formed on the X ₃ , Z ₃ plane, and the sixth coil 335 is formed on the X ₃ , Y ₃ plane. do. Here, that the coil is formed on a certain plane does not mean that the shape of the coil is flat enough to be formed on a plane, but means that the wound circular conductor is substantially parallel to the corresponding plane.

Components for concentrating the magnetic field generated by the fourth coil 331 are the fifth core block 313 and the sixth core block 315 , and the fifth core block 313 has a magnetic field in the Y ₃ axis direction. Concentrate so as not to spread, and the sixth core block 315 may focus so that the magnetic field does not spread in the Z ₃ axis direction.

Similarly, the components for concentrating the magnetic field generated by the fifth coil 333 are the sixth core block 315 and the fourth core block 311 , and the sixth core block 315 has a magnetic field in the Z ₃ axis. Concentrate so as not to spread in the direction, and the fourth core block 311 may focus so that the magnetic field does not spread in the X ₃ axis direction.

Similarly, the components for concentrating the magnetic field generated by the sixth coil 335 are the fourth core block 311 and the fifth core block 313 , and the fourth core block 311 has a magnetic field in the X ₃ axis. Concentrate so as not to spread in the direction, and the fifth core block 313 may focus so that the magnetic field does not spread in the Y ₃ axis direction.

At this time, the magnetic field generated by the current flowing in one coil (for example, the fourth coil 331) is the core formed in the other coil (for example, the fifth coil 333 and the sixth coil 335). (For example, the fifth core block 313 and the sixth core block 315) may be generated by drawing a magnetic force line in a direction normal to a plane corresponding to the coil, and the magnetic field is an axis forming the normal line. can be focused close to Accordingly, the magnetic field lines of the magnetic field formed by flowing current through the fourth coil 331 , the fifth coil 333 , and the sixth coil 335 vary depending on the amount of current applied to each coil 230 , and eventually all By synthesizing magnetic field lines, a vector in one direction can be theoretically formed. That is, by adjusting the amount of current applied to the fourth coil 331 , the fifth coil 333 , and the sixth coil 335 , a combined vector of the magnetic field can be generated in any direction of the spherical surface, and accordingly, where the receiver is placed Either way, the wireless power transmission function can be achieved by controlling the directionality.

Meanwhile, the wireless power receiver 10 may include a core and a coil wound along the outer periphery of the core.

At this time, the core 110 is formed in a hexahedral shape, and the coil 130 may form a closed loop passing through regions corresponding to all corners of the core 110 . Since the wireless power receiver 10 is the same as the wireless power receiver 10 according to the previous embodiment, a detailed description will be replaced with that of the previous embodiment.

In addition, the core includes the first core block 211 , the second core block 213 , and the third core block 215 , and the coil wound around the core includes the first coil 231 , the second coil 233 , and the third A coil 235 may be included.

At this time, the first core block 211 is formed in a plate shape, the second core block 213 is formed in a plate shape and vertically protrudes through the center of the first core block 211 , and the third core block The 215 may be formed in a plate shape, pass through the center of the first core block 211 and vertically protrude to be orthogonal to the second core block 213 .

The coil includes a first coil 231 wound along the outer periphery of the first core block 211 , a second coil 233 wound along the outer periphery of the second core block 213 , and a third core block 215 . It may include a third coil 235 wound along the outer periphery. Since the wireless power receiver 10 according to this embodiment is also the same as the wireless power receiver 10 according to the previous embodiment, a detailed description will be replaced with that of the previous embodiment.

In general, in a wireless power transmission/reception system, as the transmission space increases, the magnetic flux density close to the receiving coil of the wireless power reception apparatus 10 decreases rapidly, and power transmission efficiency may decrease rapidly.

5 and 6 are equivalent circuit diagrams illustrating a state in which power is transmitted/received by the wireless power transmission/reception system according to the present embodiment. According to the wireless power transmission/reception system according to the present embodiment, the magnetic force lines generated by the wireless power transmission device 30 can be induced to be concentrated toward the wireless power reception device 10, and the reception direction of the wireless power reception device 10 can be changed. can be improved, not only the dependence of the transmission space of power transmission efficiency is lowered, but also stable reception is possible even in a state where the coil position of the wireless power transmission device 30 and the coil position of the wireless power reception device 10 are not aligned. Reception efficiency can be maintained.

As described above, preferred embodiments according to the present invention have been described, and the fact that the present invention can be embodied in other specific forms without departing from the spirit or scope of the present invention in addition to the above-described embodiments is a fact having ordinary skill in the art. It is obvious to them. Therefore, the above-described embodiments are to be regarded as illustrative rather than restrictive, and accordingly, the present invention is not limited to the above description, but may be modified within the scope of the appended claims and their equivalents.

10: wireless power receiver
30: wireless power transmission device
110: core
130: coil
211: first core block
213: second core block
215: third core block
231: first coil
233: second coil
235: third coil
311: fourth core block
313: fifth core block
315: sixth core block
331: fourth coil
333: fifth coil
335: sixth coil

Claims (15)

A wireless power receiving device for wirelessly receiving power transmitted from a wireless power transmitting device for wirelessly transmitting power,
magnetic material core; and
a coil made of a conductive material for winding the outer periphery of the core;
Including, a wireless power receiving device.
According to claim 1,
The core is formed in a hexahedral shape,
The coil is characterized in that to form a closed loop passing through the area corresponding to all corners of the core, the wireless power receiver.
3. The method of claim 2,
The coils wound on the same side of the core are connected in series,
The coil is a wireless power receiver, characterized in that formed to pass through an area corresponding to a pair of corners parallel to each other of the core and an area corresponding to a diagonal line connecting the pair of corners of the core.
4. The method of claim 3,
The wireless power receiver, characterized in that the direction of the current flowing in the pair of coils winding the area corresponding to the pair of corners parallel to each other of the core is the same.
5. The method of claim 4,
The coil is a wireless power receiver, characterized in that it is wound with a plurality of turns (turn).
6. The method of claim 5,
The number of turns of the coil is characterized in that four times, the wireless power receiver.
According to claim 1,
The core is
A first core block formed in the form of a plate;
a second core block formed in a plate shape and vertically protruding to pass through the center of the first core block; and
A third core block formed in the form of a plate, passing through the center of the first core block and vertically protruding to be perpendicular to the second core block; includes,
The coil is
a first coil wound along an outer periphery of the first core block;
a second coil wound along an outer periphery of the second core block; and
and a third coil wound along an outer periphery of the third core block.
8. The method of claim 7,
The first core block is formed in a square shape in cross section,
The second core block and the third core block have the same area and each cross-section is formed in a rectangular shape, the wireless power receiver.
9. The method of claim 8,
The first coil forms a closed loop in a square shape,
The second coil and the third coil each form a closed loop in a rectangular shape, the wireless power receiver.
10. The method of claim 9,
The first coil, the second coil and the third coil are each wound with a plurality of turns (turn), characterized in that the wireless power receiver.
11. The method of claim 10,
The first coil, the second coil and the third coil are connected in series, characterized in that the wireless power receiver.
a wireless power transmission device for wirelessly transmitting power; and
a wireless power receiver for wirelessly receiving power transmitted from the wireless power transmitter;
The wireless power receiving device,
magnetic material core;
A wireless power transmission/reception system, characterized in that it comprises a coil of a conductive material for winding the outer periphery of the core.
13. The method of claim 12,
The wireless power receiving device,
The core is formed in a hexahedral shape,
The coil is a wireless power transmission/reception system, characterized in that it forms a closed loop passing through an area corresponding to all corners of the core.
13. The method of claim 12,
The wireless power receiving device,
The core is
A first core block formed in the form of a plate;
a second core block formed in a plate shape and vertically protruding to pass through the center of the first core block; and
A third core block formed in the form of a plate, passing through the center of the first core block and vertically protruding to be perpendicular to the second core block; includes,
The coil is
a first coil wound along an outer periphery of the first core block;
a second coil wound along an outer periphery of the second core block; and
A wireless power transmission/reception system comprising a; a third coil wound along the outer periphery of the third core block.
15. The method of claim 13 or 14,
The wireless power transmission device,
a fourth core block formed in a disk shape;
a fifth core block formed in a disk shape and orthogonal to the fourth core block;
a sixth core block formed in a disk shape, orthogonal to the fourth core block and the fifth core block, and sharing a center with the fourth core block and the fourth core block;
a fourth coil wound along the outer periphery of the fourth core block;
a fifth coil wound along an outer periphery of the fifth core block and orthogonal to the fourth coil; and
The wireless power transmission/reception system, characterized in that it is wound along the outer periphery of the sixth core block and comprises a sixth coil orthogonal to the fourth coil and the fifth coil.

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