KR20130068646A - Apparatus for transmitting wireless power and system for transmitting wireless power - Google Patents

Apparatus for transmitting wireless power and system for transmitting wireless power Download PDF

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Publication number
KR20130068646A
KR20130068646A KR1020110135946A KR20110135946A KR20130068646A KR 20130068646 A KR20130068646 A KR 20130068646A KR 1020110135946 A KR1020110135946 A KR 1020110135946A KR 20110135946 A KR20110135946 A KR 20110135946A KR 20130068646 A KR20130068646 A KR 20130068646A
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KR
South Korea
Prior art keywords
transmission
wireless power
substrate
induction coil
coil
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Application number
KR1020110135946A
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Korean (ko)
Inventor
임성현
정우길
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엘지이노텍 주식회사
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Priority to KR1020110135946A priority Critical patent/KR20130068646A/en
Publication of KR20130068646A publication Critical patent/KR20130068646A/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/003—Printed circuit coils
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

A wireless power transmitter for transmitting power to a wireless power receiver using magnetic resonance according to an embodiment of the present invention includes a plurality of cell groups, each of the plurality of cell groups is formed on a substrate and the substrate And a transmission resonant coil configured to receive power from the transmission induction coil and to receive power from the transmission induction coil and to transmit power to the wireless power receiver.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a wireless power transmission apparatus and a wireless power transmission system,

The present invention relates to a wireless power transmission apparatus and a wireless power transmission system.

In the 1800s, electric motors and transformers using electromagnetic induction principles began to be used, and then radio waves and lasers were used to transmit the electric energy to the desired devices wirelessly. A method of transmitting electrical energy by radiating the same electromagnetic wave has also been attempted. Our electric toothbrushes and some wireless shavers are actually charged with electromagnetic induction. To date, energy transmission methods using wireless methods include magnetic induction, magnetic resonance, and long-distance transmission technology using short wavelength radio frequencies.

In recent years, among such wireless power transmission techniques, energy transmission using self resonance is widely used.

In the wireless power transmission system using self-resonance, since the electric signals formed on the transmission side and the reception side are wirelessly transmitted through the coil, the user can easily charge electronic devices such as portable devices.

However, since there is no means for supplying power only to a desired area at the transmitting side, efficient power transmission is difficult.

An object of the present invention is to provide a wireless power transmission apparatus and a wireless power transmission system composed of a plurality of cell groups to supply power only to a desired area.

An apparatus for transmitting power to a wireless power receiver using magnetic resonance according to an embodiment of the present invention includes a plurality of cell groups, each of the plurality of cell groups comprising: a substrate; A transmission induction coil formed on the substrate and receiving power through an electric wire; And a transmission resonance coil disposed inside the transmission induction coil and configured to receive power from the transmission induction coil and transmit power to the wireless power receiver.

In accordance with still another aspect of the present invention, there is provided a wireless power transmission system in which a wireless power transmitter transmits power to a wireless power receiver using magnetic resonance, the wireless power transmission apparatus including a plurality of cell groups; And a wire, wherein each of the plurality of cell groups is disposed inside the transmission induction coil and the transmission induction coil formed on the substrate and the substrate, and receives power from the transmission induction coil to receive the wireless power receiver. And a transmission resonant coil for transmitting power to the wire, wherein the wire is connected to one end of the transmission induction coil to supply current to the transmission induction coil.

In accordance with still another aspect of the present invention, there is provided a wireless power transmission system in which a wireless power transmitter transmits power to a wireless power receiver using magnetic resonance, the wireless power transmission apparatus including a plurality of cell groups; And a wire, wherein some of the plurality of cell groups are disposed inside a transmission induction coil and a transmission induction coil formed on the substrate, the substrate, and receive power from the transmission induction coil to receive the wireless power. A transmission resonant coil for transmitting power to a device, wherein another portion of the plurality of cell groups comprises a transmission resonant coil for transmitting power to a substrate and the wireless power receiver, wherein the wire is connected to the transmission induction coil. One end is connected to supply current to the transmission induction coil.

According to the embodiment of the present invention, the following effects can be obtained.

By connecting or disconnecting some cell groups of the wireless power transmitter, power can be delivered only to a desired area to increase power delivery efficiency.

In addition, it is possible to increase the user convenience by mechanically implementing a plurality of cell groups constituting the wireless power transmission apparatus.

Meanwhile, various other effects will be directly or implicitly disclosed in the detailed description according to the embodiment of the present invention to be described later.

1 shows a wireless power transmission system according to an embodiment of the present invention.
2 is an equivalent circuit diagram of a transmission induction coil 210, in accordance with an embodiment of the present invention.
3 is an equivalent circuit of the power source 100 and the wireless power transmitter 200 according to an embodiment of the present invention.
4 illustrates an equivalent circuit of the reception resonance coil 310, the reception induction coil 320, the rectifier circuit 330, and the load 340 according to an embodiment of the present invention.
5 is a configuration diagram of one cell group constituting the wireless power transmitter 400 according to an embodiment of the present invention.
6 is a block diagram of a wireless power transmission system including a wireless power transmission apparatus 400 according to a first embodiment of the present invention.
7 is a block diagram of a wireless power transmission system including a wireless power transmitter 400 according to a second embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be easily understood by those skilled in the art.

1 shows a wireless power transmission system according to an embodiment of the present invention.

The power generated by the power source 100 is transmitted to the transmitter 200, and is resonated with the transmitter 200 by a self resonance phenomenon, that is, is transmitted to the receiver 300 having the same resonance frequency value.

More specifically, the power source 100 is an AC power source providing AC power at a predetermined frequency.

The transmitter 200 includes a transmission induction coil 210 and a transmission resonance coil 220. The transmission induction coil 210 is connected to the power source 100, and alternating current flows. When an alternating current flows through the transmission induction coil 210, an alternating current is also induced in the transmission resonance coil 220 which is physically spaced by electromagnetic induction. Power transmitted to the transmission resonant coil 220 is transmitted to the receiver 300 forming a resonance circuit with the transmitter 200 by magnetic resonance.

Power can be transmitted by self resonance between two LC circuits whose impedance is matched. Such power transmission by self-resonance enables power transmission to a higher efficiency, farther than the power transmission by electromagnetic induction.

The receiver 300 includes a reception resonance coil 310, a reception induction coil 320, a rectifier circuit 330, and a load 340. The power transmitted by the transmission resonant coil 220 is received by the reception resonant coil 310 so that an AC current flows in the reception resonant coil 310. The power transmitted to the reception resonance coil 310 is transmitted to the reception induction coil 320 by electromagnetic induction. The power delivered to the reception induction coil 320 is rectified through the rectifier circuit 330 and delivered to the load 340.

2 is an equivalent circuit diagram of a transmission induction coil 210, in accordance with an embodiment of the present invention. As shown in FIG. 2, the transmission induction coil 210 may be composed of an inductor L1 and a capacitor C1, thereby forming a circuit having appropriate inductance and capacitance values. The capacitor C1 may be a variable capacitor, and impedance matching may be performed by adjusting the variable capacitor. The equivalent circuits of the transmission resonant coil 220, the reception resonant coil 310, and the reception induction coil 320 may be the same as those shown in Fig.

3 is an equivalent circuit of the power source 100 and the transmitter 200 according to an embodiment of the present invention. 3, the transmission induction coil 210 and the transmission resonance coil 220 may include inductors L1 and L2 and capacitors C1 and C2 having a predetermined inductance value and a capacitance value, respectively.

4 illustrates an equivalent circuit of the reception resonance coil 310, the reception induction coil 320, the rectifier circuit 330, and the load 340, according to an embodiment of the present invention.

As shown in FIG. 4, the reception resonance coil 310 and the reception induction coil 320 may be formed of inductors L3 and L4 and capacitors C3 and C4 having predetermined inductance values and capacitance values, respectively. The rectifier circuit 330 may include a diode D1 and a rectifier capacitor C5, and converts AC power into DC power and outputs the DC power. The load 340 is indicated by a direct current power supply of 1.3 V, but may be any rechargeable battery or device requiring direct current power.

5 is a configuration diagram of one cell group constituting the wireless power transmitter 400 according to an embodiment of the present invention.

Referring to FIG. 5, the cell group 410 includes a transmission induction coil 411, a transmission resonance coil 412, and a substrate 413.

The transmission induction coil 411 and the transmission resonant coil 412 are formed on the substrate 413. The thickness 412 of the transmission induction coil 411 and the transmission resonant coil may be equal to or smaller than the thickness of the substrate.

The substrate 413 may be a printed circuit board, and may include a square shape, but is not limited thereto.

The transmission induction coil 411 is disposed along the outer surface of the substrate 413 to receive current from the connected wire 500. The transmission induction coil 411 has a circular shape inside the substrate 413, and the transmission resonant coil 412 has a circular shape inside the transmission induction coil 411. The transmission induction coil 411 includes a shape in which one conductor can be wound at least once, and the transmission resonant coil 412 also includes a shape in which one conductor can be wound at least once.

The transmission induction coil 411 receives a current from the wire 500 to generate a magnetic field, and forms a magnetic field by electromagnetic induction in the transmission resonance coil 412 by the generated magnetic field.

As shown in FIG. 5, the wire 500 may include a conductive line 510 for transmitting current to the transmission induction coil 411 and a ground line 520 for ground, but it is merely an example. The conductive line 510 and the ground line 520 may include contact pads. When the cell groups are connected to each other, the conductive lines 510 and the ground line 520 may be connected to wires of other cell groups by the contact pads 530.

6 is a block diagram of a wireless power transmission system including a wireless power transmission apparatus 400 according to a first embodiment of the present invention.

6 illustrates an example of power transmission of the wireless power transmitter 400 when each cell group constituting the wireless power transmitter 400 includes a transmission induction coil and a transmission resonance coil.

The wireless power transmission system includes a power source 100, a wireless power transmitter 400, and a wire 500. Although not shown in FIG. 6, a wireless power receiver for receiving power from the wireless power transmitter 400 may be further illustrated.

The wireless power transmitter 400 may include a plurality of cell groups, that is, a first cell group 410, a second cell group 420, a third cell group 430, and a fourth cell group 440. . In FIG. 6, the wireless power transmitter 400 is illustrated as including four cell groups, but it is not limited thereto.

Each cell group may include a transmission induction coil, a transmission resonance coil, and a substrate. The transmission induction coil and the transmission resonant coil may be configured with an equivalent circuit as shown in FIG. 2. Taking the first cell group 410 as an example, the transmission induction coil 411 has a circular shape surrounding the outer shell of the transmission resonant coil 412, and the transmission resonant coil 412 is formed of the transmission induction coil 411. It is configured in a circular shape on the inside. Each of the transmission induction coil 411 and the transmission resonant coil 412 may be configured in a form in which one conductive wire is wound a plurality of times.

The transmission induction coil 411 and the transmission resonant coil 412 may be formed on the substrate 413. The substrate 413 may be a printed circuit board generally used.

Each group of cells may be connected to each other by a groove formed in the substrate and a protrusion fitted to fit the groove. In one embodiment, each cell group may be configured in a square shape, but is not limited thereto.

Each cell group may be connected in parallel to each other.

The power source 100 supplies AC power through the wire 400.

The wire 500 may supply a current to each cell group 410, 420, 430, and 440 of the wireless power transmitter 400. Specifically, the wire 500 is connected to the transmission induction coils of each cell group to supply current to the transmission induction coils using the power received from the power source 100. The transmission induction coil of each cell group receives a current to generate a magnetic field, and the generated magnetic field is transmitted to the transmission resonance coil by electromagnetic induction. The transmission resonance coil receives a magnetic field and performs power transfer with the reception resonance coil of the wireless power receiver.

The arrow shown in the center of each cell group represents the magnetic field formed in the transmission resonant coil.

When the wireless power transmitter 400 includes four cell groups as shown in FIG. 6, the wire 500 may distribute the current evenly to the transmission induction coils of each cell group.

Each cell group of the wireless power transmitter 400 may be connected or disconnected as necessary. That is, when power transmission is required over a wide area, the wireless power transmitter 400 may be used by connecting a plurality of cell groups, and may be used by connecting a few cell groups when necessary over a narrow area.

7 is a block diagram of a wireless power transmission system including a wireless power transmitter 400 according to a second embodiment of the present invention.

FIG. 7 illustrates a case of power transmission of the wireless power transmitter 400 when some cell groups constituting the wireless power transmitter 400 include a transmission induction coil and some cell groups do not include a transmission induction coil. For example.

The wireless power transmission system includes a power source 100, a wireless power transmitter 400, and a wire 500. Although not shown in FIG. 7, a wireless power receiver for receiving power from the wireless power transmitter 400 may be further illustrated.

The wireless power transmitter 400 includes a plurality of cell groups. 7 illustrates an example in which the wireless power transmitter 400 includes nine cell groups.

The first cell group 410 includes a transmission induction coil 411, a transmission resonance coil 412, and a substrate 413.

Each cell group connected to the left, right, top, and bottom of the first cell group 410 includes a transmission resonance coil, but does not include a transmission induction coil.

The wire 500 receives AC power from the power source 100 and transmits the AC power to the transmission induction coil 411 of the first cell group 410. That is, the wire 500 is connected to the transmission induction coil 411 of the first cell group 410 to transmit current.

The transmission induction coil 411 of the first cell group 410 receives a current from the wire 500 to generate a magnetic field, and the magnetic field is also induced to the transmission resonance coil 412 by the generated magnetic field. The induced magnetic field may induce another magnetic field inside the transmission resonant coil of the cell group adjacent to the first cell group 410. The principle of magnetic field induction is based on electromagnetic induction.

Referring to FIG. 7, a magnetic field is formed in the direction of a white arrow in the transmission resonant coil 412 of the first cell group 410. When the magnetic field is formed in the direction of the white arrow, the magnetic field may be induced in the transmission resonance coils of the cell groups connected to the left, right, top, and bottom of the first cell group 410. That is, a magnetic field is formed in the direction of the black arrow in the transmission resonant coils of the left, right, top, and bottom cell groups of the first cell group 410.

The magnetic field formed inside the transmission resonance coils of the left, right, top, and bottom cell groups of the first cell group 410 is not only the transmission resonance coil 412 of the first cell group 41, but also the transmission resonance of the adjacent cell group. It may include a magnetic field induced by the coil.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It should be understood that various modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.

100: Power source
200: transmitter
210: transmission induction coil
220: transmission resonance coil
300: receiver
310: Receive resonant coil
320: reception induction coil
330: rectifier circuit
340: Load
400: wireless power transmission device
410: First cell group
411: transmission induction coil
412: transmission resonance coil
413: substrate
420: second cell group
430: first cell group
440: first cell group
500: wires

Claims (16)

A wireless power transmitter for transmitting power to a wireless power receiver using magnetic resonance,
Includes a plurality of cell groups,
Each of the plurality of cell groups,
Board;
A transmission induction coil formed on the substrate and receiving power through an electric wire;
And a transmission resonant coil disposed inside the transmission induction coil and configured to receive power from the transmission induction coil and transmit power to the wireless power receiver. The method of claim 1, wherein the wire,
Wireless power transmitter for supplying a current of the same size to each transmission induction coil included in each cell group of the plurality of cell groups. The method of claim 1, wherein the wire,
A wireless power transmitter disposed along an outer side of the substrate and connected to the transmission induction coil. The method of claim 1, wherein the substrate,
Wireless power transmission apparatus having a shape having a groove and a protrusion for connecting or separating from another substrate on one side of the substrate. The method of claim 1, wherein the substrate,
Wireless power transmitter which is a printed circuit board. The method of claim 1,
And a thickness of the transmission resonance coil is less than or equal to the thickness of the substrate. The method of claim 1, wherein the substrate,
Wireless power transmitter having a square shape. A wireless power transmission system in which a wireless power transmitter transmits power to a wireless power receiver using magnetic resonance,
A wireless power transmitter including a plurality of cell groups; And
Including wires,
Each of the plurality of cell groups,
A transmission resonance coil formed on the substrate and the transmission induction coil formed on the substrate, and receiving a power from the transmission induction coil and transmitting power to the wireless power receiver;
The wire is connected to one end of the transmission induction coil to supply current to the transmission induction coil. The method of claim 8, wherein the wire,
The wireless power transmission system for supplying a current of the same magnitude to each transmission induction coil included in each cell group of the plurality of cell groups. The method of claim 8, wherein the wire,
A wireless power transmission system disposed along the outer side of the substrate and connected to the transmission induction coil. The method of claim 8, wherein the substrate,
Wireless power transmission system having a shape having a groove and a protrusion for connecting to or separating from another substrate on one side of the substrate. The method of claim 8, wherein the substrate,
Wireless power transmission system that is a printed circuit board. 9. The method of claim 8,
And a thickness of the transmission resonance coil is less than or equal to the thickness of the substrate. The method of claim 8, wherein the substrate,
Wireless power transmission system having a square shape. A wireless power transmission system in which a wireless power transmitter transmits power to a wireless power receiver using magnetic resonance,
A wireless power transmitter including a plurality of cell groups; And
Including wires,
Some of the plurality of cell groups,
A transmission induction coil formed on the substrate and the transmission induction coil formed on the substrate, the transmission induction coil receiving power from the transmission induction coil and transmitting power to the wireless power receiver;
The other part of the plurality of cell groups,
A transmission resonance coil for transmitting power to the substrate and the wireless power receiver,
The wire is connected to one end of the transmission induction coil to supply current to the transmission induction coil. 16. The method of claim 15,
In the transmission resonant coil of some other cell group of the plurality of cell groups,
And a magnetic field is induced by a transmission resonance coil included in some cell groups of the plurality of cell groups.

KR1020110135946A 2011-12-15 2011-12-15 Apparatus for transmitting wireless power and system for transmitting wireless power KR20130068646A (en)

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KR1020110135946A KR20130068646A (en) 2011-12-15 2011-12-15 Apparatus for transmitting wireless power and system for transmitting wireless power

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KR1020110135946A KR20130068646A (en) 2011-12-15 2011-12-15 Apparatus for transmitting wireless power and system for transmitting wireless power

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220030119A (en) * 2020-09-02 2022-03-10 주식회사 엘지생활건강 Wireless Charging System

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220030119A (en) * 2020-09-02 2022-03-10 주식회사 엘지생활건강 Wireless Charging System

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