KR101640772B1 - Apparatus and method inducing wireless power receiver to power transmission area - Google Patents
Apparatus and method inducing wireless power receiver to power transmission area Download PDFInfo
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- KR101640772B1 KR101640772B1 KR1020100054630A KR20100054630A KR101640772B1 KR 101640772 B1 KR101640772 B1 KR 101640772B1 KR 1020100054630 A KR1020100054630 A KR 1020100054630A KR 20100054630 A KR20100054630 A KR 20100054630A KR 101640772 B1 KR101640772 B1 KR 101640772B1
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Abstract
An apparatus and method for directing a wireless power receiver to a transmission region are provided. A wireless power receiving apparatus that is guided to a transmission region in a wireless power transmission system determines whether or not the wireless power transmission apparatus is located outside a transmission region of the wireless power transmission apparatus based on whether data is received through in- The in-band determining unit determines the current position through an out-of-band communication with the AP, recognizing that the in-band is located outside the transmission region, Band, an out-of-band frequency band other than a resonance frequency band, an information transmission unit for transmitting information on the current position to the wireless power transmission apparatus through the out-of-band communication, And a transmission area inducing part for indicating the degree of induction as it is led to the transmission area of the transmission area.
Description
The art is directed to an apparatus and method for deriving a wireless power receiver.
Research on wireless power transmission has begun to overcome the inconveniences of wired power supply due to explosive increase of various electric devices including portable devices and limitations of existing battery capacity.
However, in the wireless power transmission system, the power reception efficiency decreases as the distance between the power transmitter and the power reception period becomes longer, and power transmission / reception and data communication become almost impossible when the transmission / reception distance becomes longer than a certain distance . Therefore, when the power receiver is located outside the power transmission / reception possible area (hereinafter referred to as "transmission area"), wireless power transmission is impossible.
In one aspect, a wireless power receiving apparatus, which is guided to a transmission region in a wireless power transmission system, is configured to transmit data to a transmission region of the wireless power transmission apparatus based on whether data is received through in- Recognizing that it is located outside the transmission area, recognizes that the current position is located outside the transmission area, and determines the current position through out-of-band communication with the AP, An out-of-band signal is transmitted to the wireless power transmission apparatus through the out-of-band communication, and the out-of-band signal is transmitted to the wireless power transmission apparatus through the out- And a transmission region inducing unit for indicating the degree of induction as it is led to the transmission region of the wireless power transmission apparatus .
The position determiner may determine a position using a positioning technique including Time Difference of Arrival (TDOA), Direction of Arrival (DOA), and Received Signal Strength Indicator (RSSI) can do.
The information transmission unit may transmit a signal for requesting guidance to the transmission region of the wireless power transmission apparatus and information about time synchronization with the wireless power transmission apparatus.
The information transmission unit may transmit authentication information required to receive wireless power from the wireless power transmission apparatus.
The transmission area inducing unit may display information on a direction and a distance to the wireless power transmission apparatus through a display (display) according to an induction signal of the wireless power transmission apparatus.
The transmission area inducing unit may vary in a signal sound generated according to a distance difference from the wireless power transmission apparatus while moving according to an induction signal of the wireless power transmission apparatus.
In another aspect, a wireless power receiving apparatus that is guided to a transmission region in a wireless power transmission system receives data at high speed through out-of-band communication even when in-band communication is possible by induction of the wireless power transmission apparatus And may further include a high-speed data receiving unit.
In accordance with another aspect of the present invention, there is provided a wireless power receiving apparatus, wherein a wireless power receiving apparatus that is guided to a transmission region in a wireless power transmission system is located in a transmission region by induction of the wireless power transmission apparatus, And an error report unit for reporting an error through the OFB communication.
In one aspect, a wireless power transmission apparatus for guiding a wireless power transmission system (wireless power receiver) to a transmission region includes an information receiving unit for receiving position information of the wireless power receiving apparatus through out-of-band communication from the wireless power receiving apparatus, , A transmission area inducing unit for guiding the wireless power receiving apparatus to the transmission area through the out-of-band communication based on the position information, and a determination unit for determining whether in-band communication is possible by guiding the wireless power reception apparatus to the transmission area And a power transmitting unit for transmitting power to the wireless power receiving apparatus through the inband if the in-band communication is possible.
The power transmitting unit can transmit high-speed data to the wireless power receiving apparatus through the out-of-band even when data communication is possible through the in-band.
The information receiving unit may receive an error through out-of-band communication from the wireless power receiving apparatus when an error occurs in the power transmission through the in-band even when the wireless power receiving apparatus is located in the transmission region due to the transmission region inducement .
In another aspect, a wireless power transmission apparatus for guiding a wireless power transmission system (wireless power receiver) to a transmission region may further include a moving unit that moves through a moving object based on the received location information.
According to one aspect of the present invention, there is provided a method of receiving a wireless power transmitted from a wireless power transmission system to a transmission area, comprising the steps of: receiving data through in-band communication with a wireless power transmission device; Recognizing that it is located outside the transmission area, determining a current position through an out-of-band communication with an AP, Frequency band, and the out-of-band is a frequency band other than a resonance frequency band, and transmitting information on the current position to the wireless power transmission apparatus through the out-of-band communication, And informing the degree of derivation as it is led to the transmission area.
The step of transmitting information on the current location may transmit authentication information required to receive wireless power from the wireless power transmission device.
In another aspect, there is provided a method of receiving a wireless power transmitted from a wireless power transmission system to a transmission region, comprising: receiving data at a high speed through out-of-band communication even when in- As shown in FIG.
According to another aspect of the present invention, there is provided a method of receiving a wireless power transmitted from a wireless power transmission system to a transmission region, And reporting the error through the band communication.
In one aspect, a wireless power transmission method for guiding from a wireless power transmission system (wireless power receiver) to a transmission region includes receiving location information of the wireless power reception apparatus from out of band communication from a wireless power reception apparatus, The method comprising the steps of: guiding the wireless power receiving apparatus to the transmission region through the out-of-band communication based on position information, determining whether in-band communication is possible by guiding the wireless power receiving apparatus to the transmission region, And transmitting power to the wireless power receiving apparatus through the in-band when band communication is possible.
The step of transmitting the power may transmit high-speed data to the wireless power receiving apparatus through the out-of-band even when data communication is possible through the in-band.
Wherein the step of receiving the position information comprises: if an error occurs in the power transmission through the in-band even when the wireless power receiving apparatus is located in the transmission region due to the transmission region induction, An error can be reported.
Out-of-band communication is performed when a power receiving device is located in an area where power and in-band data communication is impossible by using a wireless power transmission device that guides a wireless power transmission system to a transmission area. The power receiving device can be moved into the transmission area by using the communication module, so that the power transmission range can be widened.
Also, in-band data communication utilizing power transmission at the same time has a limited data transmission rate, and therefore, high-speed data transmission is possible using an out-of-band communication module.
In addition, if an error occurs in power transmission and in-band data communication, an error can be reported using an out-of-band communication module.
1 is a diagram illustrating a wireless power transmission system according to one aspect.
2 is a block diagram of a wireless power receiving apparatus that is directed to a transmission region in a wireless power transmission system according to one side.
3 is a block diagram of a wireless power transmission apparatus that is directed to a transmission region in a wireless power transmission system according to one side.
4 is a diagram illustrating an Out-of-Band communication module for deriving a transmission region in a wireless power transmission system according to an embodiment of the present invention.
5 is a diagram showing a transmission area induction using communication and positioning functions according to one side.
6 is a view illustrating a meta-structured resonator according to an embodiment of the present invention.
7 is a view showing an equivalent circuit of the resonator shown in Fig.
8 is a view of a meta-structured resonator according to another aspect.
FIG. 9 is a detailed view of the insertion position of the capacitor of FIG. 8. FIG.
10 is a flowchart of a wireless power receiving method in which a wireless power transmission system according to an embodiment is directed to a transmission area.
11 is a flowchart of a wireless power transmission method that is directed to a transmission area in a wireless power transmission system according to one side.
Hereinafter, embodiments according to one aspect will be described in detail with reference to the accompanying drawings.
First, a wireless power transmission technique used in a wireless power transmission system will be described. Wireless power transmission technology can be classified into three types, electromagnetic induction type, radio reception type, and resonance type of electric field or magnetic field.
First, in the electromagnetic induction method, a magnetic flux is generated when alternating current flows in one coil after approaching two different coils close to each other, and an electromotive force is generated in one of the other coils. In the electromagnetic induction method, the efficiency of electric power utilization is about 60% to 98%, and the most efficient and practical use is proceeding the most.
Second, the radio wave reception method uses electric wave energy received by an antenna and converts the AC wave into a direct current through a rectifying circuit to obtain electric power. The radio reception system is capable of wireless power transmission over the longest distance (several meters or more).
Third, the resonance method uses resonance of electric field or magnetic field and resonates at the same frequency between devices to transmit energy. When the resonance of a magnetic field is used, a magnetic resonance coupling using an LC resonator structure is used to generate electric power. The magnetic field resonance method is a technique that utilizes a near field effect of a short distance compared to the wavelength of the used frequency. It is a non-radiative energy transmission unlike the radio wave receiving method. The resonance frequency of the transmitting / Lt; / RTI > The power transmission efficiency is increased to about 50 ~ 60% by the magnetic field resonance method, and this efficiency is considerably higher than the propagation type through the radio wave radiation. The distance between the transmitter and the receiver is about several meters. Although the technique is used in close proximity rather than the radio reception method, it is possible to transmit power even at a very long distance than the electromagnetic induction method within a few millimeters.
On the other hand, in order to perform wireless power transmission, various data exchange is required between the power transmitting apparatus and the power receiving apparatus. That is, it is necessary to transmit and receive information about whether the power receiving apparatus needs current charging, how much is needed if necessary, how to adjust parameters to effectively perform charging, and whether or not charging is completed. An in-band data communication scheme may be used to exchange such data. Here, the in-band means a frequency band equal to the resonance frequency band for wireless power transmission, and the out-of-band means an independent frequency band which is independent of the resonance frequency band. Out-of-band communication uses a different frequency band than the in-band frequency band. Therefore, the out-of-band communicable area can be formed differently from the power transmittable / receivable area.
1 is a diagram illustrating a wireless power transmission system according to one aspect.
In the example of FIG. 1, it is assumed that the wireless power transmitted through the wireless power transmission system is a resonance power.
Referring to FIG. 1, a wireless power transmission system is a source-target structure consisting of a source and a target. That is, the wireless power transmission system includes a resonant
The resonant
The
The matching
The
The resonance
The
The matching
The
The
1, the process of controlling the cue-effector includes setting the resonance bandwidth of the
In resonant wireless power transmission, resonant bandwidth is an important factor. Qt is a Q-factor that takes into consideration both a change in distance between the
[Equation 1]
In Equation (1), f0 is the center frequency,
On the other hand, impedance mismatching occurs between the
That is, the resonant
2 is a block diagram of a wireless power receiving apparatus that is directed to a transmission region in a wireless power transmission system according to one side.
2, the wireless power receiving apparatus includes a recognizing
The
When the
A method of determining the position of the mobile terminal 200 through the AP is a positioning difference of arrival (TDOA), a direction of arrival (DOA), and a received signal strength indicator (RSSI) . The TDOA measures signal delays of adjacent APs based on the
The
The transmission
In addition, even when in-band communication is possible by induction of a wireless power transmission apparatus, a wireless power receiving apparatus that is guided to a transmission region in a wireless power transmission system according to one side can perform high-speed data reception And may further include a receiving unit. Since in-band data communication using power transmission at the same time has a limited data transmission rate, when a larger capacity of data transmission / reception is required than the limit, the wireless power receiving device can receive data at high speed through out-of-band communication.
In addition, in a wireless power transmission system according to one aspect of the present invention, a wireless power receiving apparatus that is guided to a transmission region is located in a transmission region by induction of a wireless power transmission apparatus, and if an error occurs in power transmission through the in- And an error report section for reporting an error through the error report section. The wireless power receiving apparatus can report an error to the wireless power transmission apparatus through out-of-band communication to reduce power consumption when an in-band trouble occurs.
3 is a block diagram of a wireless power transmission apparatus that is directed to a transmission region in a wireless power transmission system according to one side.
3, the wireless power transmission apparatus includes an
The
The transmission
The
The
In addition, the wireless power transmission apparatus guided to the transmission area in the wireless power transmission system according to one side may further include a moving unit moving through the mobile unit based on the received location information. For example, the wireless power transmission apparatus can be configured as a robot apparatus and can be moved, and power can be transmitted even if the wireless power receiving apparatus is not guided to the transmission region.
4 is a diagram illustrating an Out-of-Band communication module for deriving a transmission region in a wireless power transmission system according to an embodiment of the present invention.
In a target equipped with a wireless power (WP) receiving device, information is exchanged (fine-time-synchronization, transmission area induction, authentication information, etc.) necessary for position, . The out-of-band communication module can use, for example, Bluetooth and wireless LAN.
5 is a diagram showing a transmission area induction using communication and positioning functions according to one side.
Since the wireless power receiving apparatus is located outside the transmission region, it can communicate through out-of-band communication. The wireless power receiving apparatus can recognize its position by performing out-of-band communication with APs (AP1, 2, 3) and transmit the position information and the guidance request signal to the transmission region to the wireless power transmission apparatus. The wireless power receiving device can reach the transmission area under the guidance of the wireless power transmission device and can receive power from the wireless power transmission device through the inband when it reaches the transmission area.
6 is a view illustrating a meta-structured resonator according to an embodiment of the present invention.
Referring to FIG. 6, the meta-structured resonator includes a transmission line 610 and a capacitor 620. Here, the capacitor 620 is inserted in series at a specific position of the transmission line 610, and the electric field is confined in the capacitor.
Also, as shown in FIG. 6, the meta-structured resonator has a three-dimensional structure. 6, the resonator can be implemented in a two-dimensional structure in which the transmission line is disposed in the x, z plane.
The capacitor 620 is inserted into the transmission line 610 in the form of a lumped element and a distributed element such as an interdigital capacitor or a gap capacitor centered on a substrate having a high dielectric constant. 620 are inserted into the transmission line 610, the resonator may have a characteristic of a metamaterial.
Here, a metamaterial is a material having a special electrical property that can not be found in nature, and has an artificially designed structure. The electromagnetic properties of all materials present in nature have inherent permittivity or permeability, and most materials have a positive permittivity and a positive permeability. In most materials, the right-hand rule applies to electric fields, magnetic fields and pointing vectors, so these materials are called RHM (Right Handed Material). However, the meta-material is a material having a permittivity or permeability of less than 1, and may be an epsilon-negative (ENG) material, a mu negative material, a double negative material, a negative refractive index (NRI) Materials, and left-handed (LH) materials.
At this time, when the capacitance of the capacitor inserted as a lumped element is appropriately determined, the resonator can have the property of the metamaterial. In particular, by properly adjusting the capacitance of the capacitor, the resonator can have a negative magnetic permeability, so that the resonator according to an embodiment of the present invention can be referred to as an MNG resonator.
The MNG resonator may have a zeroth-order resonance characteristic with a resonance frequency at a frequency when the propagation constant is zero. Since the MNG resonator may have a zero resonance characteristic, the resonance frequency may be independent of the physical size of the MNG resonator. That is, as will be described later, it is sufficient to appropriately design a capacitor in order to change the resonance frequency in the MNG resonator, so that the physical size of the MNG resonator can be changed.
Also, since the electric field in the near field is concentrated in the serial capacitor 620 inserted in the transmission line 610, the magnetic field is dominant in the near field due to the series capacitor 620.
In addition, since the MNG resonator can have a high Q-factor by using the capacitor 620 to the lumped element, the efficiency of power transmission can be improved.
In addition, the MNG resonator may include a matching unit 630 for impedance matching. At this time, the matching unit 630 can appropriately adjust the intensity of the magnetic field for coupling with the MNG resonator, and the impedance of the MNG resonator is adjusted by the matching unit 630. Then, current flows into the MNG resonator through the connector 640 or flows out from the MNG resonator.
Further, although not explicitly shown in FIG. 6, a magnetic core passing through the MNG resonator may further be included. Such a magnetic core can perform a function of increasing a power transmission distance.
The characteristics of the MNG resonator of the present invention are described in detail below.
7 is a view showing an equivalent circuit of the resonator shown in Fig.
The resonator shown in Fig. 6 can be modeled by the equivalent circuit shown in Fig. In the equivalent circuit of Fig. 7, C L represents a capacitor inserted in the form of a lumped element in the middle of the transmission line of Fig.
At this time, the resonator for the radio power transmission shown in Fig. 6 has the zero-th resonance characteristic. That is, when the propagation constant is zero, the resonator for wireless power transmission
&Quot; (2) "
Referring to Equation 2, the resonance frequency of the resonator
8 is a view of a meta-structured resonator according to another aspect.
Referring to FIG. 8, the meta-structured resonator includes a
In the
The
The
The
FIG. 9 is a view showing the insertion position of the
9, the
10 is a flowchart of a wireless power receiving method in which a wireless power transmission system according to an embodiment is directed to a transmission area.
A wireless power transmission system includes a wireless power transmission device corresponding to a source and a wireless power receiving device corresponding to a target.
In
Also, if it is determined that the target is located outside the transmission area in
Also, in
In addition, in
Also, even if in-band communication is possible by induction of the wireless power transmission device, the target can receive data at high speed through out-of-band communication.
Also, even if the target is located in the transmission region by induction of the wireless power transmission apparatus, if an error occurs in the power transmission through the in-band, the target can report an error through out-of-band communication.
11 is a flowchart of a wireless power transmission method that is directed to a transmission area in a wireless power transmission system according to one side.
A wireless power transmission system includes a wireless power transmission device corresponding to a source and a wireless power receiving device corresponding to a target.
In
Also, in
Also, in
In
The methods according to embodiments of the present invention may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill 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. This is possible.
Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.
Claims (19)
A recognition unit that recognizes that the mobile station is located outside a transmission area of the wireless power transmission apparatus based on whether data is received through in-band communication with the wireless power transmission apparatus;
When it is recognized that the mobile terminal is located outside the transmission area, the position determining part-in-band for determining the current position through out-of-band communication with the AP means the same frequency band as the resonance frequency band Out-of-band is a frequency band other than the resonance frequency band;
An information transmission unit for transmitting information on the current position to the wireless power transmission apparatus through the out-of-band communication; And
A transmission area inducing unit for informing the degree of induction as it is led to the transmission area of the wireless power transmission apparatus;
≪ / RTI >
Wherein,
Transmits information on time tuning with the wireless power transmission apparatus,
Wherein the information on the time tuning includes:
Information for tuning the position of the wireless power receiving apparatus and the position of the wireless power receiving apparatus recognized by the wireless power transmitting apparatus
A wireless power receiving apparatus in a wireless power transmission system leading to a transmission region.
The position determining unit may determine,
In performing the out-of-band communication with the AP, a wireless power transmission method of determining a position using a positioning technique including a Time Difference of Arrival (TDOA), a Direction of Arrival (DOA), and a Received Signal Strength Indicator A wireless power receiving device derived from a system to a transmission region.
Wherein,
Wherein the wireless power transmission system transmits a signal requesting guidance to a transmission region of the wireless power transmission apparatus.
Wherein,
And transmits authentication information required to receive wireless power from the wireless power transmission apparatus.
The transmission area inducing unit
Wherein the wireless power transmission system is connected to a transmission area in a wireless power transmission system that displays information on a direction and a distance to the wireless power transmission device according to an induction signal of the wireless power transmission device through a screen (display).
The transmission area inducing unit
Wherein the wireless power transmission apparatus is driven in accordance with an induction signal of the wireless power transmission apparatus, and there is a difference in a signal sound generated due to a distance difference from the wireless power transmission apparatus.
Even when in-band communication is possible by induction of the wireless power transmission apparatus, a high-speed data reception unit
Wherein the wireless power transmission system further comprises:
An error report unit for reporting an error through out-of-band communication when an error occurs in power transmission through the in-band even when the wireless power transmission apparatus is located in the transmission region by induction,
Wherein the wireless power transmission system further comprises:
An information receiving unit for receiving position information of the wireless power receiving apparatus through out-of-band communication from the wireless power receiving apparatus;
A transmission region inducing unit for guiding the wireless power receiving apparatus to the transmission region through the out-of-band communication based on the position information;
A communication determination unit for determining whether the wireless power receiving apparatus is guided to the transmission region and in-band communication is possible; And
And a power transmission unit for transmitting power to the wireless power reception apparatus through the in band if the in-band communication is possible,
Lt; / RTI >
The transmission area inducing unit
Receiving information on time tuning with the wireless power receiving apparatus,
Wherein the information on the time tuning includes:
Information for tuning the position of the wireless power receiving apparatus and the position of the wireless power receiving apparatus recognized by the wireless power transmitting apparatus
A wireless power transmission apparatus for guiding from a wireless power transmission system to a transmission region.
The power transmission unit may include:
Band to a transmission area in a wireless power transmission system that transmits high-speed data to the wireless power reception device through the out-of-band even when data communication is possible through the in-band.
Wherein the information receiver comprises:
And an error is reported through the out-of-band communication from the wireless power receiving apparatus when an error occurs in the power transmission through the in-band even when the wireless power receiving apparatus is located in the transmission region by the transmission region inducement To a transmission region.
A moving unit that moves through the moving object based on the received position information,
To a transmission region in a wireless power transmission system further comprising:
Recognizing that it is located outside the transmission area of the wireless power transmission apparatus based on whether data is received through in-band communication with the wireless power transmission apparatus;
Determining that the current position is determined through out-of-band communication with the AP, recognizing that the mobile station is located outside the transmission region, the in-band means the same frequency band as the resonance frequency band, The band is a separate frequency band - not a resonant frequency band;
Transmitting information on the current position to the wireless power transmission apparatus through the out-of-band communication; And
A step of informing the degree of induction as it is led to the transmission region of the wireless power transmission apparatus
≪ / RTI >
Wherein the transmitting comprises:
Transmits information on time tuning with the wireless power transmission apparatus,
Wherein the information on the time tuning includes:
Information for tuning the position of the wireless power receiving apparatus and the position of the wireless power receiving apparatus recognized by the wireless power transmitting apparatus
A wireless power receiving method in a wireless power transmission system leading to a transmission area.
Wherein the step of transmitting information on the current location comprises:
And transmitting authentication information required to receive wireless power from the wireless power transmission apparatus.
Even when in-band communication is possible by induction of the wireless power transmission apparatus, the step of receiving data at high speed through out-of-band communication
Wherein the wireless power transmission system further comprises:
When an error occurs in the power transmission through the in-band even when the wireless power transmission apparatus is located in the transmission region by induction of the wireless power transmission apparatus, an error is reported through the out-
Wherein the wireless power transmission system further comprises:
Receiving position information of the wireless power receiving apparatus through out-of-band communication from the wireless power receiving apparatus;
Guiding the wireless power receiving apparatus to a transmission region through the out-of-band communication based on the position information;
Determining whether in-band communication is possible by guiding the wireless power receiving apparatus to the transmission region; And
If the in-band communication is possible, transmitting power to the wireless power receiving apparatus through the in-band
≪ / RTI >
The method of claim 1,
Receiving information on time tuning with the wireless power receiving apparatus,
Wherein the information on the time tuning includes:
Information for tuning the position of the wireless power receiving apparatus and the position of the wireless power receiving apparatus recognized by the wireless power transmitting apparatus
A wireless power transmission method for guiding from a wireless power transmission system to a transmission region.
Wherein the transmitting power comprises:
Wherein the wireless power transmission system transmits high-speed data to the wireless power receiving apparatus through the out-of-band even when data communication is possible through the in-band.
Wherein the step of receiving the location information comprises:
And an error is reported through the out-of-band communication from the wireless power receiving apparatus when an error occurs in the power transmission through the in-band even when the wireless power receiving apparatus is located in the transmission region by the transmission region inducement To the transmission region.
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