KR101751126B1

KR101751126B1 - Apparatus for receiving power wirelessly and power supply apparatus using the same

Info

Publication number: KR101751126B1
Application number: KR1020150136999A
Authority: KR
Inventors: 조상호; 김창익; 박승원; 김태성; 신은영; 성재석
Original assignee: 삼성전기주식회사
Priority date: 2015-04-09
Filing date: 2015-09-25
Publication date: 2017-06-27
Also published as: KR20160121361A

Abstract

A wireless power receiving apparatus according to one technical aspect of the present invention can be coupled to a wearable apparatus including internal parts. The radio power receiving apparatus may include a magnetic sheet attached to a surface of the inner part and a receiving coil wound outside the magnetic sheet in the longitudinal direction of the inner part.

Description

TECHNICAL FIELD [0001] The present invention relates to a wireless power receiving apparatus and a power supply apparatus using the wireless power receiving apparatus.

The present invention relates to a wireless power receiving apparatus and a power supply apparatus using the same.

2. Description of the Related Art [0002] With the advancement of wireless technology, non-contact wireless power charging technology capable of charging electronic devices with electric power even in a non-contact state has been recently developed.

However, conventional wireless power transmission technologies have a number of limited requirements for smooth charging. That is, the wireless power transmission / reception has a limitation on the limited transmission distance, limited positional relationship of the transceiver, and the like.

That is, there is a problem that the efficiency of charging the wireless power can be increased by positioning the wireless power receiving device and the wireless power transmitting device so as to face each other.

On the other hand, wireless power technology is being applied to various portable devices, and accordingly, there is a demand for a wireless power charging technology that can efficiently charge even in various device environments.

Korean Patent Laid-Open Publication No. 2014-0011556 Korean Patent Laid-Open Publication No. 2014-0067185

An object of an embodiment according to the present invention is to provide a wireless power transmission apparatus capable of effectively performing wireless charging even in a wearable apparatus.

A technical aspect of the present invention proposes a wireless power receiving apparatus. The wireless power receiving apparatus may be included in a wearable apparatus including an internal component having a predetermined thickness. The wireless power receiving apparatus may include a receiving coil formed by being wound around the internal component and a power circuit portion providing the power received from the receiving coil to the wearable device.

Another technical aspect of the present invention proposes a power supply. The power supply device includes a battery included in the wearable device and supplying power to the wearable device, a receive coil wound around the battery, and a power circuit for supplying power received from the receive coil to the battery .

The solution of the above-mentioned problems does not list all the features of the present invention. Various means for solving the problems of the present invention can be understood in detail with reference to specific embodiments of the following detailed description.

The wireless power receiving apparatus according to an embodiment of the present invention can provide an effect of effectively performing wireless charging even in a wearable apparatus.

1 is a diagram showing an example of a wireless power receiving apparatus and a wireless power transmitting apparatus applied to a planar electronic apparatus.
2 is a diagram illustrating an example of a wireless power receiving apparatus and a wireless power transmitting apparatus applied to a wearable device according to an embodiment of the present invention.
3 is a block diagram illustrating a wireless power receiving apparatus according to an embodiment of the present invention.
4 is a block diagram illustrating a wireless power transmission apparatus in accordance with an embodiment of the present invention.
5 is a perspective view showing an example of a receiving coil according to an embodiment of the present invention.
6 is a front view showing a receiving coil according to an embodiment of the present invention.
7 is a cross-sectional view taken along the line AA 'of the receiving coil of FIG.
8 is a front view showing a receiving coil according to another embodiment of the present invention.
9 is a cross-sectional view of the receiving coil of FIG. 8 taken along the line AA '.
10 is a front view showing a receiving coil according to another embodiment of the present invention.
11 is a cross-sectional view of the receiving coil of FIG. 10 taken along the line AA '.
12 is a diagram illustrating a receive coil according to another embodiment of the present invention.
13 is a view showing a receive coil according to another embodiment of the present invention.

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

However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art.

1 is a diagram showing an example of a wireless power receiving apparatus and a wireless power transmitting apparatus applied to a planar electronic apparatus.

1, the wireless power receiving apparatus 20 is connected to the smartphone 30 and can receive power wirelessly from the wireless power transmitting apparatus 10 and provide it to the smartphone 30 have.

The wireless power receiving device 20 can be located on the cover of the smartphone 30 and thus is easy to have requirements for charging with the wireless power transmitting device 10. [ That is, the receiving coil of the wireless power receiving apparatus 20 can be set in parallel with the transmitting coil of the wireless power transmitting apparatus 10. [

Therefore, in the case of the illustrated example, the wireless power receiving apparatus 20 can easily receive the power only by the receiving coil formed in the cover of the smart phone 30 or the like and wound in the plane.

On the other hand, in the case of a wireless power receiving apparatus to be applied to a wearable device, the wireless power receiving apparatus must be so small as to be applicable to a wearable apparatus, and also must secure a space for the receiving coil within such a miniaturized structure. Different requirements are required from the receiving device.

Hereinafter, a wireless power receiving apparatus according to various embodiments of the present invention will be described with reference to FIGS. 2 to 13. FIG.

2 is a diagram illustrating an example of a wireless power receiving apparatus and a wireless power transmitting apparatus applied to a wearable device according to an embodiment of the present invention.

In the example shown in FIG. 2, the smart watch 300 is shown as an example of a wearable device, but this is exemplary and the wireless power receiving device 200 is applicable to various wearable devices.

The wireless power receiving apparatus 200 may be included inside the smart watch 300.

When the smart watch 300 is placed on the wireless power transmission device 100, the wireless power transmission device 100 and the smart watch 300 can be placed so that the body portion of the wireless watch 300 is vertical. That is, as shown in the illustrated example, the body of the wireless power transmission device 100 and the smart watch 300 may be placed so as not to be parallel to each other.

If the coil of the wireless power receiving apparatus 200 is formed parallel to the body of the smart watch 300, the coil of the wireless power receiving apparatus 200 and the wireless The coils of the power transmission device 200 become perpendicular to each other. The magnetic cohesion of the two vertical coils is weak, and in this case, the wireless charging is impossible or the time required for charging is increased.

Therefore, the present invention provides various embodiments in which wireless charging can be stably performed even in an environment where the wireless power receiving apparatus 200 is placed at a predetermined angle with the wireless power transmitting apparatus 100, as described above.

That is, the various embodiments of the present invention can efficiently perform wireless charging in various wearable devices by forming the receiving coil of the wireless power receiving apparatus 200 as in the embodiments shown in Figs. 4 to 12 can do.

3 is a block diagram illustrating a wireless power transmission apparatus in accordance with an embodiment of the present invention.

3, the wireless power transmission apparatus 100 may include a power supply unit 110, a power transmission unit 120, a resonance unit 130, a detection unit 140, and a control unit 150. According to an embodiment, the wireless power transmission apparatus 100 may further include a wireless communication unit 160.

The power supply unit 110 may supply the necessary power to each component of the wireless power transmission apparatus 100. For example, the power supply unit 110 may be a power supply module that receives commercial AC power and converts the AC power into a plurality of DC power having various voltage levels.

The power transmission unit 120 may be connected to the transmission coil of the resonance unit 130 to provide a current to the transmission coil. For example, the power transmitting unit 120 may include an amplifying circuit including a plurality of switches. The amplifying circuit can provide a current to the transmitting coil through a switching operation to a plurality of switches.

The resonant portion 130 may include a transmitting coil. The transmitting coil may be magnetically coupled to the receiving coil of the wireless power receiving apparatus 200 to transmit power wirelessly.

Here, the magnetic coupling between the transmitting coil and the receiving coil is not limited to a particular method. For example, the transmit coil and the receive coil can be magnetically coupled in a magnetic resonance fashion. As another example, the transmitting coil and the receiving coil may be magnetically coupled in a self-resonating manner.

The detection unit 140 can detect the sensing voltage from the current flowing through the transmission coil. The control unit 150 can determine the change amount of the impedance of the transmission coil by using the variation amount of the sensing voltage. The control unit 150 can determine whether the wireless power receiving apparatus 200 is adjacent to the wireless power transmitting apparatus 100 by using the impedance change amount.

In the illustrated example, the detection unit 140 is shown as sensing the current flowing in the transmission coil, but this is exemplary. Therefore, the detection unit 140 may be variously modified to detect the input voltage of the power transmission unit 140, for example.

The control unit 150 can control the operation of the power transmitting unit 120.

For example, the control unit 150 may control the power transmitting unit 120 to transmit a beacon signal, a long beacon signal, or a short beacon signal. The controller 150 receives a response to the long beacon signal from the wireless communication unit 160 or verifies the impedance change of the short beacon signal to check whether the wireless power receiving apparatus 200 can receive wireless power have.

The control unit 150 controls the power transmitting unit 120 to transmit power wirelessly.

The control unit 150 may include a processing unit. According to an embodiment, the controller 150 may further include a memory. The processing unit may include a central processing unit (CPU), a graphics processing unit (GPU), a microprocessor, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) And may have a plurality of cores. The memory may be a volatile memory (e.g., RAM, etc.), a non-volatile memory (e.g., ROM, flash memory, etc.), or a combination thereof.

The wireless communication unit 160 may form a short-range wireless communication line with the wireless power receiving apparatus 200. For example, the wireless communication unit 160 may form a short-range wireless communication line with the wireless power receiving apparatus 200 in a Bluetooth manner.

4 is a block diagram illustrating a wireless power receiving apparatus according to an embodiment of the present invention.

The wireless power receiving apparatus 200 may include a receiving coil 210 and a power circuit unit 220 for providing the power received from the coil to the wearable apparatus.

The power circuit section 220 may include a resonance section 221, a rectification section 222, a conversion section 223, and a control section 224. According to an embodiment, the power circuit unit 220 may further include a wireless communication unit 225. [

The resonance unit 221 includes a resonance circuit connected to the reception coil 210. The resonance unit 221 may be magnetically coupled to the resonance unit 130 of the wireless power transmission apparatus 100 to receive power wirelessly.

The power received through the resonance unit 221 is rectified through the rectifying unit 222 and converted by the converting unit 223 to be supplied to the wearable device, for example, the battery of the wearable device.

The control unit 224 can control the operation of the rectifying view 222 or the converting unit 223. [

The control unit 224 may include a processing unit. According to an embodiment, the control unit 224 may further include a memory. The processing unit may include a central processing unit (CPU), a graphics processing unit (GPU), a microprocessor, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) And may have a plurality of cores. The memory may be a volatile memory (e.g., RAM, etc.), a non-volatile memory (e.g., ROM, flash memory, etc.), or a combination thereof.

According to an embodiment, the control unit 224 may be implemented as a control unit of the wearable device.

In the embodiment including the wireless communication unit 250, the control unit 224 can perform communication for power transmission with the wireless power transmission apparatus 100 using the wireless communication unit 250. [ According to an embodiment, the wireless communication unit 250 may be a configuration of a wearable device.

On the other hand, when the transmission coil and the reception coil are parallel to each other, the efficiency of magnetic coupling is highest, and as the angle of tilt increases, the efficiency of magnetic coupling decreases. Therefore, in the case of the wearable device of the related art, there is a problem that the angle of the reception coil and the transmission coil is large and the efficiency of magnetic coupling is low.

Hereinafter, various embodiments of the receiving coil applicable to the present invention, which can efficiently achieve magnetic coupling even in a wearable device, will be described.

5 is a perspective view showing an example of a receiving coil according to an embodiment of the present invention.

Referring to FIG. 5, the receiving coil 210 may be wound outside the inner part 301 of the wearable device.

The inner part 301 is a part included in the body of the wearable device. In one embodiment, the internal component 301 may be a battery that powers the wearable device.

Since the inner coil 301 can have a predetermined thickness and the receiving coil 210 wound around the inner part 301 is wound in an ellipse (or a circular shape depending on the part) It can magnetically couple with the transmitting coil smoothly.

In one embodiment, the inner part 301 may be a longer polyhedron in one direction. Here, the one direction will be referred to as the longitudinal direction. The receiving coil 210 can be wound in the longitudinal direction of the inner part 301 outside the inner part 301. [

In the illustrated example, the inner part 301 is a curved hexahedral battery whose longitudinal direction is the longitudinal direction. The receiving coil 210 can be coiled in the longitudinal direction of the inner part 301 so that the receiving coil 210 and the transmitting coil in the wireless power transmitting device 100 can be positioned horizontally or at an angle close to the horizontal have.

This is because when the inner part 301 is a polyhedron longer in one direction, the wearable device can be laid down in the longitudinal direction as shown when the wireless power transmission device 100 is located. That is, when the inner part 301 is a polyhedron having one longer direction, the wearable device may also have a longer shape in one direction. Therefore, it is unstable to stand in the longitudinal direction unless the wearable device has a separate structure, so that it can be laid down in the longitudinal direction.

Thus, the receiving coil 210 wound in the longitudinal direction of the inner part 301 may be positioned at a horizontal or near horizontal angle with respect to the transmitting coil in the wireless power transmitting apparatus 100.

In one embodiment, the inner part 301 may be a polyhedron having a length corresponding to the first direction and the second direction. In this embodiment, the receiving coil 210 can be wound in a first direction of the inner part 301, outside the inner part 301. [ Here, the first direction can be determined according to the overall shape and length of the wearable device.

FIG. 6 is a front view showing a receive coil according to an embodiment of the present invention, and FIG. 7 is a cross-sectional view taken along the line A-A 'of FIG.

As shown in Figs. 6 and 7, the wireless power receiving apparatus may further include a magnetic substance sheet 211. Fig.

The magnetic substance sheet 211 can be attached to the surface of the inner part 301. [ The receiving coil 210 can be wound on the outside of the magnetic substance sheet 211. [

The magnetic substance sheet 211 may be made of a material having a predetermined magnetic property. For example, it may be made of a resin material containing a metal powder. As another example, a ferrite sheet (which may include a NiZnCu / MnZn series), a sandstrue metal, a permalloy metal, an amorphous magnetic material, or a combination thereof may be used.

7A shows an embodiment in which magnetic sheets 211a and 211b are attached to the front and rear surfaces of the inner part 301. FIG. The magnetic substance sheets are attached to the upper and lower surfaces 211a and 211b, the upper and lower surfaces 211c and 211d, and both sides (not shown).

The illustrated magnetic sheet 211, 211a to 211d can function as a passage through which a magnetic field formed in the receiving coil 210 flows. Therefore, a magnetic field formed in the reception coil 210 can flow through the magnetic substance sheets 211 and 211a to 211d, even though the internal component 301 is an insulator such as a battery.

In the illustrated example, the receiving coil 210 is shown wound to the outside of the magnetic substance sheet 211, but this is an example. That is, the receiving coil 210 may be an electrically conductive material equivalent to the actual coil. For example, the magnetic substance sheet 211 may be formed of a predetermined substrate such as a printed circuit board (PCB), and the receiving coil 210 may be formed of a conductive pattern formed on or inside the substrate .

FIG. 8 is a front view showing a receiving coil according to another embodiment of the present invention, and FIG. 9 is a cross-sectional view taken along the line A-A 'of FIG.

As shown in Figs. 8 and 9, a magnetic substance sheet 211 may be attached to the outside of the inner part 301. Fig. The receiving coil 210 can be wound around one side of the inner part 301 outside the magnetic substance sheet 211. [

The present embodiment can be applied when winding on the other side of the inner part 301 is impossible due to other shapes or external conditions of the wearable device.

9A and 9B illustrate an embodiment in which magnetic sheet sheets 211a and 211b are attached to the front and back surfaces of the inner part 301. FIG. 211a and 211b, upper and lower surfaces 211c and 211d, and both sides (not shown).

FIG. 10 is a front view showing a receive coil according to another embodiment of the present invention, and FIG. 11 is a cross-sectional view taken along the line A-A 'of FIG.

10 and 11, a magnetic substance sheet 211 can be attached to the outside of the inner part 301 and the receiving coil 210 can be attached to the inner part 301 outside the magnetic substance sheet 211, As shown in Fig.

In the illustrated example, the number of windings of the upper part or the lower part of the inner part 301 of the receiving coil is larger than the number of windings of the central part of the inner part. In this example, the volume of the receiving coil 210 is relatively small in the center part of the inner part 301, so that the space can be utilized, for example, a circuit can be placed. Therefore, the wearable device can be formed into a slim shape.

11A and 11B illustrate an embodiment in which the magnetic material sheets 211a to 211d are attached to the front and back surfaces of the inner part 301. FIG. 211a and 211b, upper and lower surfaces 211c and 211d, and both sides (not shown).

In the embodiments shown in Figs. 4 to 11, the inner part 301 is illustrated as a hexahedron having a curved surface, but the inner part 301 may be formed in various shapes as described above.

Figs. 12 and 13 are diagrams showing a receive coil according to another embodiment of the present invention, in which the inner parts are formed in an elliptical shape.

As shown in FIG. 12, even when the inner parts are formed in an elliptical shape, the magnetic substance sheet 211 may be attached to the outside of the inner part, and the receiving coil 210 may be wound thereon.

Also, as described above, the winding direction of the receiving coil 210 can be determined differently depending on the overall shape and length of the wearable device.

As shown in Fig. 13, the receiving coil 210 can be wound concentrically on the elliptical arc portion. In the case where the receiving coil 210 is wound as in the present embodiment, it is applicable to a general wearable device that is set up in the longitudinal direction.

4 to 13, in various embodiments of the present invention, the transmit coil of the receive coil 210 and the transmit coil of the wireless power transmitter 100 may be disposed at an angle within a predetermined angle with respect to each other have.

Therefore, the magnetic coupling force of the reception coil 210 and the transmission coil of the wireless power transmission apparatus 100 can be strengthened, and accordingly, the power can be efficiently transmitted or received wirelessly in the wearable device. In addition, since the transmitting coil of the receiving coil 210 and the transmitting coil of the wireless power transmitting apparatus 100 can have stronger magnetic coupling force, the degree of freedom with respect to the charging distance can also be increased.

In the above description, the wireless power receiving apparatus has been described as a separate apparatus from the wearable apparatus, but the wireless power receiving apparatus according to the embodiment can be implemented as a configuration of the wearable apparatus.

In one embodiment, the wireless power receiving device may be a configuration of the power supply of the wearable device. According to one embodiment of the present invention, the power supply device includes a battery (internal component) in a wearable device that supplies power to the wearable device, a receiving coil wound and formed around the battery, and a power circuit . &Lt; / RTI > Also, various embodiments described with reference to Figs. 4 to 13 are applicable to such a wireless power receiving apparatus.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the particular forms disclosed. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: Wireless power transmitter
20: Wireless power receiving device
30: Smartphone
100: Wireless power transmitting device
110: Power supply
120: All transmission
130: Resonance part
140:
150:
160:
200: Wireless power receiving device
210: Receive coil
211: Magnetic body sheet
220: Power circuit
221: resonance part
222: rectification part
223:
224:
225:
300: Wearable device
301: Internal parts

Claims

1. A wireless power receiving device included in a wearable device including an internal component,
A receiving coil wound around the inner part; And
A power circuit for providing the power received from the receiving coil to the wearable device; And the wireless power receiving device.

The receiver according to claim 1,
And is wound in the longitudinal direction of the internal part.

The wireless power receiving apparatus according to claim 1,
A magnetic sheet attached to a surface of the internal component; Further comprising:
Part or all of the receiving coil
And is wound on the outer surface of the magnetic sheet.

The wireless power receiving apparatus according to claim 1,
A magnetic sheet attached to a surface of the internal component; Further comprising:
The receiving coil
And a conductive pattern formed on an outer surface of said magnetic substance sheet.

The receiver according to claim 1,
Wherein the number of times of winding the upper part or the lower part of the inner part is greater than the number of times of winding the central part of the inner part.

The power supply circuit according to claim 1,
A resonance part including a resonance circuit connected to the reception coil;
A rectifier for rectifying the power provided by the resonator; And
A converting unit for converting the output of the rectifying unit and providing the converted output to the wearable device; And the wireless power receiving device.

A battery included in the wearable device and supplying power to the wearable device;
A receiving coil wound around the battery; And
A power circuit for supplying power received from the receiving coil to the battery; &Lt; / RTI >

8. The receiver of claim 7,
Wherein the battery is wound in the longitudinal direction of the battery.

8. The apparatus of claim 7, wherein the power supply
A magnetic sheet attached to a surface of the battery; Further comprising:
All or part of the receiving coil
And is wound on the outer surface of the magnetic sheet.

8. The apparatus of claim 7, wherein the power supply
A magnetic sheet attached to a surface of the battery; Further comprising:
The receiving coil
And a conductive pattern formed on an outer surface of the magnetic substance sheet.

8. The receiver of claim 7,
Wherein the number of windings of the upper portion or the lower portion of the battery is greater than the number of windings of the central portion of the battery.

8. The power supply circuit according to claim 7, wherein the power circuit section
A resonance part including a resonance circuit connected to the reception coil;
A rectifier for rectifying the power provided by the resonator; And
A converting unit for converting the output of the rectifying unit and providing the converted output to the battery; &Lt; / RTI >