KR20130128041A - Wireless charging device, wireless charging system and wireless charging method - Google Patents

Abstract

A wireless charging device, a wireless charging system, and a wireless charging method are provided. The wireless charging device charging a charging device comprises an antenna part receiving power by bringing an alternating magnetic field; a matching circuit changing a resonant frequency of the antenna part; and a control part matching the resonant frequency of the antenna part with a resonant frequency of the alternating magnetic field using the matching circuit. The control part determines whether the charging device is adjacent to the control part and transmits the power to the charging device using the antenna part when the charging device is close to the control part. [Reference numerals] (120) Matching circuit;(130) Control unit;(140) Communication unit;(220) Impedance matching unit;(230) Charging unit;(240) Battery unit;(250) Communication unit;(AA) Alternating magnetic field

Description

Wireless Charging Device, Wireless Charging System and Wireless Charging Method

The present invention relates to a wireless charging system, a wireless charging device and a wireless charging method using the same.

Recently, interest in energy-IT convergence technology is increasing. Energy-IT convergence technology refers to the convergence of IT technology that is rapidly developing in the conventional energy technology, there is a wireless power transfer (WPT) technology as one field of such energy-IT convergence technology. Wireless power transmission refers to a technology of supplying power to home appliances or electric vehicles wirelessly instead of the conventional wired power line. In order to charge home appliances, a power cable wired from a power outlet to a home appliance or a charger is used. Related research is being actively conducted because of the advantage of being able to charge home appliances wirelessly without a connection.

The wireless power transmission technology currently commercialized or researched can be classified into four types. One of them is a high power microwave radiation method, which can transmit a long distance because it can transmit a high power using a frequency of several GHz band, while it is not commercialized due to problems such as harmfulness to human body and straightness. The other is the near field transmission method of the radial method, which is an RFID service using the RFID / USN frequency band of the UHF (Ultra High Frequency) band or the 2.4 GHz ISM band, and is currently scheduled for distribution and logistics. It is commercially available in the field, and has a disadvantage in that only up to several tens of mW can be transmitted by radiation loss. On the other hand, the contact transmission method using inductive coupling is a method of transmitting power of several W in a contact type at a distance of several mm to several cm, and uses a frequency such as 125 kHz or 135 kHz. It is applied to the electric toothbrush. On the other hand, non-radiated magnetic resonance method is based on the resonant coupling (resonant coupling) method. Resonant coupling refers to a phenomenon in which electromagnetic waves move from one medium to another through a near-field magnetic field when two media resonate at the same frequency in the case of magnetic resonance. The advantage is that transmission is possible. However, it is necessary to keep the Q (Quality Factor) value of the resonator high for practical implementation.

On the other hand, alternating magnetic fields of various frequencies are formed in the atmosphere by the operation of various electronic devices. In the alternating magnetic field, magnetic energy is continuously radiated and wasted. Therefore, after collecting the alternating magnetic field in the air by using the inductively coupled transmission method, the collected magnetic energy is used to charge other electronic devices. Can be.

Therefore, in the case of using the alternating magnetic field in the air, it is possible to charge various charging devices using the alternating magnetic field even when a separate power outlet or power adapter is not carried.

In this regard, Korean Patent Publication No. 2011-0131954 discloses an invention entitled "Wireless Power Transmission Apparatus and Method thereof".

The invention disclosed in Korean Patent Laid-Open No. 2011-0131954 discloses a wireless power transmission apparatus capable of detecting a non-target receiver that is not allowed to receive wireless power, and processing the wireless power transmission to the detected non-target receiver as much as possible. It is.

Korean Patent Publication No. 2011-0131954, "Wireless Power Transmission Device and Method Thereof"

In order to solve the above-mentioned problems of the prior art, the present invention provides a wireless charging device capable of charging a load device by using alternating magnetic energy in a limited area.

In addition, the present invention provides a wireless charging device that can charge a variety of portable devices even when there is no separate external power source.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood from the following description.

In order to achieve the above object, a wireless charging device for charging a charging device according to an aspect of the present invention, an antenna unit for receiving power by substituting an alternating magnetic field, a matching circuit for changing the resonance frequency of the antenna unit and the matching circuit And a control unit for matching the resonance frequency of the antenna unit with the resonance frequency of the alternating magnetic field by using the control unit. The control unit determines whether the charging device is adjacent to each other and uses the antenna unit when the charging device is adjacent. Transfer power to the charging device.

Here, the wireless charging device may further include a communication unit for communicating with the adjacent charging device.

Here, the communication unit transmits a detection signal at a first time interval, and if the response signal corresponding to the detection signal is not received from the charging device within a second time after the transmission of the detection signal, the detection after the third time. When the signal is re-sent at the first time interval and the response signal is received from the charging device within a second time after the detection signal is transmitted, the control unit may notify whether the response signal is received.

Here, the wireless charging device may further include a second antenna unit that is different in resonance frequency from the antenna unit.

Here, the wireless charging device may further include a second matching circuit for adjusting the resonance frequency of the second antenna unit.

Here, the controller may match the resonance frequency of the second antenna unit with the resonance frequency of the charging device by using the second matching circuit.

In addition, the wireless charging system according to another aspect of the present invention includes a charging device having a rechargeable battery and a wireless charging device that acquires power by substituting an alternating magnetic field and transmits the power to the charging device as an RF signal. and,

The wireless charging device includes an antenna unit for interposing the alternating magnetic field and radiating the RF signal, a matching circuit for changing a resonance frequency of the antenna unit, and a resonance frequency of the antenna unit by using the matching circuit. Further comprising a control unit for matching the frequency,

The charging device may include a device antenna unit for receiving the RF signal radiated from the antenna unit, an impedance matching unit for changing a resonance frequency of the device antenna unit by changing an impedance of the device antenna unit, and power converted from the RF signal. The apparatus may further include a charging unit configured to supply the rechargeable battery, wherein the controller determines whether the charging device is adjacent to each other, and transmits power to the charging device using the antenna unit when the charging device is adjacent.

The wireless charging device may further include a device communication unit for communicating with the adjacent charging device, and the charging device may further include a device communication unit for communicating with the device communication unit.

Here, the device communication unit transmits a detection signal at a first time interval, and if the response signal corresponding to the detection signal is not received from the device communication unit within a second time after the transmission of the detection signal, the detection after the third time. When the signal is re-sent at the first time interval and the response signal is received from the device communication unit within a second time after the detection signal is transmitted, the controller may be notified whether the response signal is received.

The wireless charging apparatus may further include a second antenna unit having a resonance frequency different from that of the antenna unit, and the charging device may further include a second device antenna unit corresponding to the second antenna unit.

Here, the wireless charging system may further include a second matching circuit for adjusting the resonance frequency of the second antenna unit.

The controller may match the resonance frequency of the second antenna unit with the resonance frequency of the second device antenna unit using the second matching circuit.

In addition, in the wireless charging method using an alternating magnetic field according to another aspect of the present invention, if the charging device is disposed adjacent to the wireless charging device, the communication unit detects the charging device, receiving from the alternating magnetic field included through the antenna unit Determining a position to place the wireless charging device and the charging device by measuring power; detecting a resonance frequency of the alternating magnetic field using a matching circuit; resonant frequency of the antenna unit to match the sensed resonance frequency Changing a and transmitting power received from the alternating magnetic field to the charging device.

The detecting of the resonance frequency of the alternating magnetic field may be a step of changing the resonance frequency of the antenna unit by using the matching circuit and searching for a frequency at which the reception power from the alternating magnetic field is maximum.

The searching of the charging device may include: transmitting, by a communication unit, a detection signal at a first time interval, and by the communication unit, a response signal corresponding to the detection signal from the charging device for a second time after the transmission of the detection signal. Waiting for reception of the signal, re-sending the detection signal at the first time interval after a third time if the response signal is not received within the second time, and receiving the response signal within the second time The control unit may further include transmitting power to the charging device that has transmitted the response signal by using the antenna unit.

The wireless charging method may further include detecting a resonance frequency of the charging device by using a second matching circuit, and matching the resonance frequency of the second antenna unit with the resonance frequency of the charging device. The device may transmit power to the charging device or communicate with the charging device by using the second antenna unit.

In addition, in the wireless charging method using an alternating magnetic field according to another aspect of the present invention, if the charging device is disposed adjacent to the wireless charging device, the communication unit detects the charging device, receiving from the alternating magnetic field included through the antenna unit Determining a position to place the wireless charging device and the charging device by measuring power; detecting a resonance frequency of the alternating magnetic field; and changing a resonance frequency of the antenna unit to match the sensed resonance frequency And transmitting power received from the alternating magnetic field to the charging device.

The detecting of the resonance frequency of the alternating magnetic field may be a step of changing the resonance frequency of the antenna unit by using the matching circuit and searching for a frequency at which the reception power from the alternating magnetic field is maximum.

The detecting of the charging device may include: transmitting, by the communication unit, a detection signal at a first time interval, and responding to the detection signal by the communication unit from the charging device for a second time after the transmission of the detection signal. Waiting for a signal to be received; re-sending the detection signal at the first time interval after a third time if the response signal is not received within the second time; and the response signal is received within the second time. If received, the control unit may further include transmitting power to the charging device that has transmitted the response signal by using the antenna unit.

Here, in the wireless charging method, after detecting the charging device, detecting the resonance frequency of the charging device by using a second matching circuit and matching the resonance frequency of the second antenna unit with the resonance frequency of the charging device. The wireless charging device may further include transmitting power to the charging device or communicating with the charging device by using the second antenna unit.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It is provided to fully inform the owner of the scope of the invention.

According to one of the problem solving means of the present invention described above, the load device can be charged using alternating magnetic energy.

In addition, according to one of the problem solving means of the present invention described above, it is possible to charge a variety of portable devices even when there is no separate external power source.

1 is a diagram illustrating a general wireless power transmission apparatus.
2 is a schematic diagram showing a wireless charging device and a charging device in a wireless charging system according to an embodiment of the present invention.
3 is a detailed configuration diagram of a wireless charging system according to an embodiment of the present invention.
4 is a detailed configuration diagram of a wireless charging device according to an embodiment of the present invention.
5 is a view for explaining an example of a communication method between a wireless charging device and a charging device in a wireless charging system according to an embodiment of the present invention.
6 is a detailed configuration diagram of a wireless charging device according to another embodiment of the present invention.
7 is a flowchart illustrating a wireless charging method according to an embodiment of the present invention.
8 is a flowchart illustrating a wireless charging method according to another embodiment of the present invention.
9 is a flowchart illustrating a wireless charging method according to another embodiment of the present invention.

While the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and similarities. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In addition, numerals (e.g., first, second, etc.) used in the description of the present invention are merely an identifier for distinguishing one component from another.

Also, in this specification, when an element is referred to as being "connected" or "connected" with another element, the element may be directly connected or directly connected to the other element, It should be understood that, unless an opposite description is present, it may be connected or connected via another element in the middle.

In the present specification, the charging device is a mobile device equipped with a rechargeable battery, and is a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP). ), Navigation, and the like.

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

1 is a diagram illustrating a general wireless power transmission apparatus.

As shown in FIG. 1, a wireless power transmission apparatus uses a magnetic induction or magnetic resonance method between a wireless power transmitter (hereinafter, referred to as a power transmitter) 10 and a wireless power receiver (hereinafter, referred to as a power receiver) 20. Send it.

The power transmitter 10 converts an AC power input from an external input power source 12 into an electromagnetic signal through an internal circuit such as a rectifier (not shown), a power amplifier (not shown), and then transmits the power transmission antenna 11. Transmission to the power receiver 20 through.

The power receiver 20 receives the electromagnetic wave signal transmitted from the power transmitter 10. To this end, the power receiver 20 may be provided with a power receiving antenna 21.

In the magnetic resonance method, the resonant frequencies of the power transmitting antenna 11 and the power receiving antenna 21 are preferably the same or almost the same. In this case, an energy transfer channel is formed between the power transmitting antenna 11 and the power receiving antenna 21 by resonant coupling. Electromagnetic waves emitted from the power transmission antenna 11 are transmitted to the power receiving antenna 21 through an energy transmission channel, and the electromagnetic waves input through the power receiving antenna 21 are impedance matching circuits (not shown) in the power receiver 20. It is converted into electric power through a circuit such as a rectifier (not shown). The converted power is transferred to the load device 30 connected to the power receiver 20 to charge the load device 30 or provide driving power.

In the case of using the magnetic induction method, the resonant frequencies of the power transmitting antenna 11 and the power receiving antenna 21 do not have to be almost the same frequency. However, by matching the resonant frequencies of the power transmitting antenna 11 and the power receiving antenna 21 almost identically, It is possible to improve the power transfer efficiency between both ends.

Hereinafter, a wireless charging system according to an embodiment of the present invention will be described with reference to FIG. 2 based on the wireless power transmission method described above.

2 is a schematic diagram showing a wireless charging device and a charging device constituting a wireless charging system according to an embodiment of the present invention.

As shown in FIG. 2, the wireless charging system according to an exemplary embodiment of the present invention includes a wireless charging device 100 and a charging device 200 that is charged with power supplied through the wireless charging device 100.

The wireless charging device 100 may capture an alternating magnetic field in the air and convert it into electric power without being connected to an external power source. The converted power may be transmitted to an external charging device 200 through a transmission antenna mounted inside the device, and used to charge a battery mounted inside the wireless charging device 100.

In addition, the wireless charging device 100 may be provided with a display for externally displaying the magnitude of the detected magnetic field at the current location. Alternatively, a speaker for displaying the sensed alternating magnetic field to the outside with sound may be further provided.

The wireless charging device 100 transmits power to the charging device 200 as an RF signal through a transmission antenna, and the power transmission method may be a magnetic resonance method or a magnetic induction method.

Hereinafter, a power transmission method between the wireless charging device 100 and the charging device 200 will be described with the description of the detailed components.

3 is a detailed configuration of a wireless charging system according to an embodiment of the present invention. The wireless charging device 100 includes a transmission antenna 110, a matching circuit 120, a controller 130, and the like. In addition, the wireless charging device 100 may further include a communication unit 140 for communication with the charging device. In addition, the charging device 200 includes a receiving antenna 210, an impedance matching unit 220, a charging unit 230, and a battery unit 240, and performs communication with the communication unit 140 of the wireless charging device 100. The communication unit 250 may further include. A communication method between the communication unit 140 of the wireless charging device 100 and the communication unit 250 of the charging device 200 will be described later with reference to FIG. 5.

The transmit antenna 110 incorporates an alternating magnetic field at the current location. In addition, the transmission antenna 110 may transmit power to the reception antenna 210 according to a control signal of the controller 130 to be described later. In this case, the transmitted power may be transmitted in the form of an RF energy signal. In addition, it is preferable that the transmitting antenna 110 and the receiving antenna 210 to be described later have the same or approximate resonance frequency.

The transmission antenna 110 may be configured differently according to the wireless power scheme. For example, when the wireless charging device 100 is implemented by a magnetic induction method, the transmission antenna 110 may be configured as a single loop antenna. On the other hand, when the wireless charging device 100 is implemented in a magnetic resonance method, the transmitting antenna 110 may be configured as a pair of a power transmission coil and a resonant coil for power transmission.

In addition, the transmit antenna 110 may be implemented in a loop form. In this case, the transmitting antenna 110 may be in the form of a spiral loop or a helical loop.

The matching circuit 120 changes the resonance frequency of the transmitting antenna 110. In detail, the matching circuit 120 may be positioned at the rear end of the transmitting antenna 110 to match an impedance between the transmitting antenna 110 and the controller 130. To this end, the matching circuit 120 may include a variable capacitor, or may include a parallel array structure in which a plurality of circuits in which capacitors and FET switches are connected in series are connected in parallel. In addition, the variable capacitor or the parallel array may be connected in series or in parallel with the transmission antenna 110 to change the resonance frequency of the transmission antenna 110 by changing the capacitance value of the matching circuit 120.

The controller 130 uses the matching circuit 120 to match the resonance frequency of the transmission antenna 110 with the resonance frequency of the alternating magnetic field. In addition, as shown in FIG. 4, the controller 130 converts the power received wirelessly through the transmission antenna 110 into a direct current through the rectifier 132, and converts the converted DC signal into the voltage amplifier 134. To any voltage.

In addition, the controller 130 may further include a frequency controller 136. The frequency controller 136 measures the amount of power received while changing the resonance frequency by adjusting the capacitance of the matching circuit 120, and senses a frequency at which the maximum amount of power is obtained at the same location. The frequency controller 136 may control to receive the maximum energy from the alternating magnetic field by fixing the resonance frequency to the frequency at which the maximum amount of power is obtained.

The power converted by the controller 130 may be stored in the battery unit 150, or may be converted into DC power required again and transmitted to the external charging device 200. Specifically, when the controller 130 detects the presence of the charging device 200 adjacent to the wireless charging device 100, the controller 130 may control to transmit power to the detected charging device 200.

In this case, the controller 130 may detect the presence or absence of the adjacent charging device 200 through the communication unit 140 or by measuring a change in the transmission current due to the impedance change.

Specifically, when the external charging device 200 is adjacent to the wireless charging device 100 in a state in which energy is radiated to the outside through the transmission antenna 110, the transmission antenna 110 according to the load of the charging device 200. Energy is wirelessly transmitted from the receiver antenna 210 to the receiving antenna 210, and the amount of current consumption in the wireless charging device 100 is increased. In this case, the controller 130 may detect the presence of the charging device 200 in an adjacent position by detecting a sudden change in the amount of current consumption.

Alternatively, the presence or absence of the adjacent charging device 200 may be detected through communication with an external charging device 200. This will be described later in detail with reference to FIG. 5.

The charging device 200 includes a receiving antenna 210 and an impedance matching unit 220. The receiving antenna 210 receives power from the transmitting antenna 110 of the wireless charging apparatus 100, and the impedance matching unit 220 matches the resonant frequency of the receiving antenna 210 to the resonant frequency of the transmitting antenna 110. You can.

In addition, the charging device 200 further includes a charging unit 230 for charging the battery unit 240 using the received power, and a communication unit 250 for transmitting and receiving a message with the communication unit 140 of the wireless charging device 250. can do.

Next, referring to FIG. 5, a method of determining whether a charging device is adjacent to each other using communication between the wireless charging device and the charging device will be described.

5 is a view for explaining an example of a communication method between a wireless charging device and a charging device in a wireless charging system according to an embodiment of the present invention.

In FIG. 5, the communication unit 140 of the wireless charging apparatus 100 and the communication unit 250 of the charging device 200 are mutually connected through magnetic field communication or load modulation communication using the transmission antenna 110 and the reception antenna 210. You can pass a message to. Alternatively, the wireless charging apparatus 100 may further include separate communication antennas 160 and 260 for communication between the charging device 200.

First, the communication unit 140 of the wireless charging device 100 transmits an ACK signal (detection signal) to the communication unit 250 of the charging device 200 at a predefined time interval (hereinafter, referred to as a first time interval) (S102). . In this case, the communication unit 140 may include power enough to operate the communication unit 250 of the charging device 200 in the detection signal and transmit the detected signal.

Subsequently, when a response signal (response signal) in response to the detection signal is received from the communication unit 250 of the charging device 200 within a predefined time interval (hereinafter, the second time interval), the wireless charging apparatus 100 The communication unit 140 notifies the control unit 130 of the reception of the response signal (S104), and the control unit 130 wirelessly initiates power transmission to the charging device 200 that has transmitted the response signal. In this case, the communication unit 140 may transmit a separate power transmission start signal to the communication unit 250 of the charging device 200. In addition, even after the power transmission is started, the communication unit 140 may be configured to periodically transmit a detection signal in the power transmission process (S106) and receive a response signal corresponding thereto (S108).

Through this, the wireless charging device 100 may monitor the state of the charging device 200, and if the response signal is not received within the second time interval for the transmission of the detection signal (S110), the schedule check process Through the determination that the charging device 200 is separated from the wireless charging device 100, the wireless power transmission to the charging device 200 may be stopped (S112). Thereafter, the communication unit 140 of the wireless charging apparatus 100 may be configured to retransmit the detection signal again at a first time interval after a predefined time (hereinafter, referred to as a third time) (S114).

Meanwhile, in another embodiment of the present invention, the wireless charging device 100 may further include a separate transmission antenna for communication and power transmission with the charging device 200. This configuration is shown in FIG.

In FIG. 6, the wireless charging device 100 may further include a second transmission antenna 160 in addition to the transmission antenna 110. In addition, the electronic device may further include a second matching circuit 170 that performs impedance matching of the second transmission antenna 160.

The second transmission antenna 160 may be used for communication with the charging device 200 by the communication unit 140, or may be used to transmit power to the charging device 200 instead of the transmission antenna 110.

In this case, the second transmission antenna 160 may be changed to have a different resonance frequency from that of the transmission antenna 110, and the controller 130 detects the resonance frequency of the charging device 200 and operates the second matching circuit 170. By controlling, the resonance frequency of the second transmission antenna 160 may be matched with the resonance frequency of the charging device 200.

Through such a configuration, the wireless charging apparatus 100 of the present invention can receive power with optimum efficiency by matching the resonance frequency of the transmission antenna 110 with the resonance frequency of the symmetrical magnetic field, and further, the second transmission antenna. The resonance frequency of 160 may be matched with the resonance frequency of the charging device 200 to ensure that the power transmission efficiency to the charging device 200 is optimal.

Next, a wireless charging method using the wireless charging system will be described.

7 is a flowchart illustrating a wireless charging method according to an embodiment of the present invention.

Referring to FIG. 7, first, the wireless charging apparatus 100 of the present invention is moved to various positions, and the position where the size of the alternating magnetic field is greatest is searched (S210). At this time, the wireless charging device 100 includes the alternating magnetic field by using the transmitting antenna 110, and measures the amount of power transmitted from the alternating alternating magnetic field by the controller 130 to determine the strength of the alternating magnetic field at the current position. Can be. In addition, the measured intensity of the alternating magnetic field may be displayed to the user through a separate display unit or a speaker.

Thereafter, when the optimum position is determined through the search, the wireless charging device 100 is positioned at the corresponding position (S220).

Thereafter, the wireless charging device 100 determines whether the charging device 200 that needs to be charged at an adjacent location is searched (S230), and when the charging device 200 is found, the wireless charging device 100 detects and transmits a resonant frequency of an alternating magnetic field. The resonance frequency of the antenna 110 is matched (S240).

Thereafter, the wireless charging device 100 charges the charging device 200 using the power received from the alternating magnetic field (S250). In this case, the wireless charging device 100 may simultaneously perform charging of the built-in battery unit 150 and may receive power from the battery unit 150 in which charging is completed and transmit the power to the charging device 200.

8 is a flowchart illustrating a wireless charging method according to another embodiment of the present invention.

Referring to FIG. 8, first, the charging device 200 to be charged is adjacent to the wireless charging device 100 to recognize the charging device 200 (S310). Thereafter, while moving the wireless charging device 100 and the charging device 200, the optimum position is searched by measuring the amount of power received from the alternating magnetic field that is received through the transmission antenna 110 (S320).

Thereafter, the controller 130 controls the matching circuit 120 to detect the resonant frequency of the alternating magnetic field, and matches the resonant frequency of the transmission antenna 110 to the detected resonant frequency (S330).

Thereafter, the charging device 200 is charged by transmitting power received from the alternating magnetic field to the charging device 200 (S340).

9 is a flowchart illustrating a wireless charging method according to another embodiment of the present invention.

Referring to FIG. 9, first, the wireless charging device 100 of the present invention is moved and the location of the largest alternating magnetic field is searched for (S410). At this time, the wireless charging device 100 subsumes the alternating magnetic field by using the transmission antenna 110, and determines the strength of the alternating magnetic field at the current position by measuring the amount of power transmitted from the alternating magnetic field included in the control unit 130. Can be. Also, the measured intensity of the alternating magnetic field may be displayed to the user through a separate display unit or a speaker.

Thereafter, when the optimum position is determined through the search, the wireless charging device 100 is positioned at the corresponding position (S420).

Thereafter, the wireless charging device 100 determines whether the charging device 200 that needs to be charged at an adjacent location is searched (S430), and when the charging device 200 is found, the wireless charging device 100 detects and transmits a resonant frequency of an alternating magnetic field. The resonance frequency of the antenna 110 is matched (S440). In addition, the resonance frequency of the charging device 200 is sensed to match the resonance frequency of the second transmission antenna 160 (S450).

Thereafter, the wireless charging device 100 charges the charging device 200 by transmitting the power received from the alternating magnetic field to the charging device 200 at a matched resonance frequency (S460).

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention.

Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments.

The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims (20)

A wireless charging device for charging a charging device,
An antenna unit for receiving power by substituting an alternating magnetic field,
A matching circuit for changing a resonance frequency of the antenna unit;
A controller for matching the resonance frequency of the antenna unit with the resonance frequency of the alternating magnetic field by using the matching circuit
Further comprising:
The control unit determines whether the charging device is adjacent, and transmits power to the charging device using the antenna unit when the charging device is adjacent,
Wireless charging device. The method of claim 1,
Further comprising a communication unit for communicating with the adjacent charging device,
Wireless charging device. 3. The method of claim 2,
The communication unit transmits a detection signal at a first time interval,
The communication unit re-sends the detection signal at the first time interval after a third time if a response signal corresponding to the detection signal is not received from the charging device within a second time after the transmission of the detection signal,
If the communication unit receives the response signal from the charging device within a second time after the transmission of the detection signal, notifying the control unit whether or not to receive the response signal,
Wireless charging device. 3. The method of claim 2,
Further comprising a second antenna unit different in resonance frequency from the antenna unit,
Wireless charging device. 5. The method of claim 4,
Further comprising a second matching circuit for adjusting the resonance frequency of the second antenna unit,
Wireless charging device. The method of claim 5, wherein
The control unit matches the resonant frequency of the second antenna unit with the resonant frequency of the charging device by using the second matching circuit.
Wireless charging device. In a wireless charging system,
A charging device with a rechargeable battery and
A wireless charging device that acquires power by substituting an alternating magnetic field and transmits the power to the charging device as an RF signal,
The wireless charging device,
An antenna unit for interposing the alternating magnetic field and radiating the RF signal;
A matching circuit for changing a resonance frequency of the antenna unit;
A controller for matching a resonance frequency of the antenna unit with a resonance frequency of the alternating antenna using the matching circuit
More,
The charging device,
A device antenna unit for receiving the RF signal radiated from the antenna unit;
An impedance matching unit for changing a resonance frequency of the device antenna unit by changing an impedance of the device antenna unit;
Further comprising a charging unit for supplying the power converted from the RF signal to the rechargeable battery,
The control unit determines whether the charging device is adjacent, and transmits power to the charging device using the antenna unit when the charging device is adjacent,
Wireless charging system. The method of claim 7, wherein
The wireless charging device further includes a device communication unit for performing communication with the adjacent charging device,
The charging device further comprises a device communication unit for communicating with the device communication unit,
Wireless charging system. The method of claim 8,
The device communication unit transmits a detection signal at a first time interval,
If the device communication unit does not receive a response signal corresponding to the detection signal from the device communication unit within a second time after the transmission of the detection signal, and re-send the detection signal at the first time interval after a third time,
If the device communication unit receives the response signal from the device communication unit within a second time after the transmission of the detection signal, notifying the control unit whether or not to receive the response signal,
Wireless charging system. The method of claim 8,
The wireless charging apparatus further includes a second antenna unit different in resonance frequency from the antenna unit,
The charging device further includes a second device antenna unit corresponding to the second antenna unit,
Wireless charging system. 11. The method of claim 10,
Further comprising a second matching circuit for adjusting the resonance frequency of the second antenna unit,
Wireless charging system. The method of claim 11,
The control unit matches the resonance frequency of the second antenna unit with the resonance frequency of the second device antenna unit using the second matching circuit.
Wireless charging system. In the wireless charging method using an alternating magnetic field,
Determining a position to place the wireless charging device by measuring received power from an alternating magnetic field subsumed through the antenna unit,
Searching for a charging device adjacent to the wireless charging device disposed at the determined position,
Detecting a resonant frequency of the alternating magnetic field using a matching circuit;
Changing the resonance frequency of the antenna unit to match the sensed resonance frequency; and
Transmitting power received from the alternating magnetic field to the charging device
/ RTI >
Wireless charging method. The method of claim 13,
Detecting the resonant frequency of the alternating magnetic field,
Changing the resonance frequency of the antenna unit by using the matching circuit and searching for a frequency at which the received power from the alternating magnetic field is maximum;
Wireless charging method. The method of claim 13,
Searching for the charging device,
Transmitting, by the communication unit, the detection signal at a first time interval;
Waiting for the communication unit to receive a response signal corresponding to the detection signal from the charging device for a second time after the transmission of the detection signal;
Resending the detection signal at the first time interval after a third time if the response signal is not received within the second time; and
When the response signal is received within the second time, transmitting a power to a charging device that has transmitted the response signal by using the antenna unit;
Further comprising, wireless charging method. The method of claim 13,
Detecting a resonant frequency of the charging device using a second matching circuit; and
Matching the resonant frequency of the second antenna unit with the resonant frequency of the charging device;
The wireless charging device transmits power to the charging device or communicates with the charging device by using the second antenna unit.
Wireless charging method. In the wireless charging method using an alternating magnetic field,
Detecting, by the communication unit, the charging device when the charging device is disposed adjacent to the wireless charging device;
Determining a position to place the wireless charging device and the charging device by measuring received power from an alternating magnetic field subsumed through an antenna unit,
Detecting a resonant frequency of the alternating magnetic field using a matching circuit;
Changing the resonance frequency of the antenna unit to match the sensed resonance frequency; and
Transmitting power received from the alternating magnetic field to the charging device
/ RTI >
Wireless charging method. The method of claim 17,
Detecting the resonant frequency of the alternating magnetic field,
Changing the resonance frequency of the antenna unit by using the matching circuit and searching for a frequency at which the received power from the alternating magnetic field is maximum;
Wireless charging method. The method of claim 17,
Detecting the charging device,
Transmitting, by the communication unit, a detection signal at a first time interval;
Waiting for the communication unit to receive a response signal corresponding to the detection signal from the charging device for a second time after the transmission of the detection signal;
Resending the detection signal at the first time interval after a third time if the response signal is not received within the second time; and
When the response signal is received within the second time, transmitting a power to a charging device that has transmitted the response signal by using the antenna unit;
≪ / RTI >
Wireless charging method. The method of claim 17,
After detecting the charging device,
Detecting a resonant frequency of the charging device using a second matching circuit; and
Matching the resonant frequency of the second antenna unit with the resonant frequency of the charging device;
The wireless charging device transmits power to the charging device or communicates with the charging device by using the second antenna unit.
Wireless charging method.

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