WO2013069951A1 - Wireless power transmission and receiving system capable of multi charge - Google Patents

Wireless power transmission and receiving system capable of multi charge Download PDF

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Publication number
WO2013069951A1
WO2013069951A1 PCT/KR2012/009305 KR2012009305W WO2013069951A1 WO 2013069951 A1 WO2013069951 A1 WO 2013069951A1 KR 2012009305 W KR2012009305 W KR 2012009305W WO 2013069951 A1 WO2013069951 A1 WO 2013069951A1
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WO
WIPO (PCT)
Prior art keywords
wireless power
power signal
unit
power
receiving
Prior art date
Application number
PCT/KR2012/009305
Other languages
French (fr)
Other versions
WO2013069951A4 (en
Inventor
Min-Seok Han
Lae-Hyuk Park
Young-Sun Kim
Jung-Man HWANG
Un-Kyoo Park
Ji-Hyung Lee
Original Assignee
Ls Cable Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority to KR10-2011-0115254 priority Critical
Priority to KR1020110115254A priority patent/KR101910194B1/en
Application filed by Ls Cable Ltd. filed Critical Ls Cable Ltd.
Publication of WO2013069951A1 publication Critical patent/WO2013069951A1/en
Publication of WO2013069951A4 publication Critical patent/WO2013069951A4/en

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/50Circuit arrangements or systems for wireless supply or distribution of electric power using additional energy repeaters between transmitting devices and receiving devices
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/40Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J5/00Circuit arrangements for transfer of electric power between ac networks and dc networks
    • H02J5/005Circuit arrangements for transfer of electric power between ac networks and dc networks with inductive power transfer
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/022Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters characterised by the type of converter
    • H02J7/025Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters characterised by the type of converter using non-contact coupling, e.g. inductive, capacitive
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B5/00Near-field transmission systems, e.g. inductive loop type
    • H04B5/0025Near field system adaptations
    • H04B5/0037Near field system adaptations for power transfer
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially

Abstract

A wireless power transmission and receiving system capable of multi charge includes a wireless power transmission device for generating a first power signal having a resonance frequency of a first band when a normal power is supplied, and transmitting the generated first power signal to the outside by means of a magnetic resonance method; a first wireless power receiving device for converting the first power signal received by means of the magnetic resonance method into useable electricity, converting a surplus wireless power signal, whish has not been converted into the useable electricity, into a second power signal having a resonance frequency of a second band, and retransmitting the generated second power signal to the outside by means of the magnetic resonance method; and at least one second wireless power receiving device for converting the second power signal, which has been received by means of the magnetic resonance method, into useable electricity.

Description

WIRELESS POWER TRANSMISSION AND RECEIVING SYSTEM CAPABLE OF MULTI CHARGE

The present disclosure relates to a wireless power transmission and receiving system for wirelessly transmitting power to be used for charging a driving power source or a battery, and more particularly, to a wireless power transmission and receiving system capable of multi charge, which may transmit and receive wireless power to/from a plurality of various wireless power receiving devices by using magnetic resonance.

Cross-Reference to Related Application

The present application claims priority to Korean Patent Application No. 10-2011-0115254 filed in the Republic of Korea on November 7, 2011, the disclosures of which are incorporated herein by reference.

PDA, PMP, . .In a conventional non-contact charging method, a wireless pad having a primary coil for generating an induced electromotive force is provided, and a portable electronic device having a secondary coil corresponding to the primary coil is placed on the wireless pad.

However, in this method, the coil for generating the induced electromotive force should have a planar shape, and wireless power transmitting and receiving sides should be near to each other. In addition, since there is directivity between the power transmitting side and the power receiving side, the charging efficiency may vary depending on their alignment and a great amount of heat is generated.

Recently, an advanced skill capable of sending a relatively greater power several meters away compared to the conventional non-contact charging method, namely a magnetic resonance method for concentrating energy on a specific resonance frequency and transmitting power in the form of magnetic energy, has been actively studied. However, the magnetic resonance method demands a high resonance characteristic and is not easily applied to wireless power of various wireless power receiving devices.

In other words, even though the magnetic resonance method may transmit power suitably to a plurality of wireless power receiving devices having the same required power, the resonance frequency should be adjusted by using a complicated control algorithm in order to transmit wireless power to a plurality of wireless power receiving devices whose required power is different from each other. In addition, if distances between the wireless power transmitting unit and the wireless power receiving devices are irregular, power may not be properly transmitted.

Therefore, in the technical field of the present disclosure, a technique for a wireless power transmission and receiving system using a magnetic resonance method, which may be easily applied to a plurality of various wireless power receiving devices, is urgently demanded.

The present disclosure is designed to solve the problems of the prior art, and therefore the present disclosure is directed to providing a wireless power transmission and receiving system capable of multi charge, which uses a magnetic resonance method and is configured for a high-power wireless power receiving device to retransmit surplus power to a low-power wireless power receiving device so that the wireless power transmission and reception may be applied to a plurality of various wireless power receiving devices.

In one aspect of the present disclosure, there is provided a wireless power transmission and receiving system capable of multi charge, which includes a wireless power transmission device for generating a first power signal having a resonance frequency of a first band when a normal power is supplied, and transmitting the generated first power signal to the outside by means of a magnetic resonance method; a first wireless power receiving device for converting the first power signal received by means of the magnetic resonance method into useable electricity, converting a surplus wireless power signal, whish has not been converted into the useable electricity, into a second power signal having a resonance frequency of a second band, and retransmitting the generated second power signal to the outside by means of the magnetic resonance method; and at least one second wireless power receiving device for converting the second power signal, which has been received by means of the magnetic resonance method, into useable electricity.

Preferably, the first wireless power receiving device is provided at a wireless power receiving device which demands relatively higher useable electricity in comparison to the second wireless power receiving device.

Preferably, the resonance frequency of the first band of the first power signal is relatively lower than the resonance frequency of the second band of the second power signal.

Preferably, the wireless power transmission device includes a power supply unit for receiving AC power of the normal power into DC power and supplying the DC power; a wireless power signal generating unit for generating a first power signal having the resonance frequency of the first band when the DC power is supplied from the power supply unit; a wireless power signal transmitting unit for wirelessly transmitting the first power signal generated by the wireless power signal generating unit through a power transmission antenna by means of the magnetic resonance method; a wireless power signal transmitting unit for wirelessly transmitting the first power signal generated by the wireless power signal generating unit through the power transmission antenna to the outside air; a wireless power detecting unit for detecting and outputting required power of the first wireless power receiving device; and a controller for controlling the wireless power signal generating unit and the wireless power signal transmitting unit so that a wireless power signal corresponding to the required power detected by the wireless power detecting unit is transmitted.

Preferably, the power transmission antenna of the wireless power transmission device includes a resonance coil for emitting the wireless power signal to the outside.

Preferably, the first wireless power receiving device includes a wireless power signal receiving unit for wirelessly receiving a first power signal, which has been wirelessly transmitted by the wireless power transmission device, through a power receiving antenna by means of the magnetic resonance method; a power converting unit for converting the first power signal, which has been received by the wireless power signal receiving unit, into useable electricity and supplying the useable electricity to a power source unit of the wireless power receiving device; a power detecting unit for detecting and outputting required power of the wireless power receiving device; a wireless power signal distributing unit provided between the wireless power signal receiving unit and the power converting unit to output a wireless power signal required for converting the useable electricity to the power converting unit, and separating and outputting a surplus wireless power signal not converted into the useable electricity; a wireless power signal converting unit for receiving the surplus wireless power signal output from the wireless power signal distributing unit and converting the surplus wireless power signal into a second power signal having the resonance frequency of the second band; a wireless power signal transmitting unit for wirelessly transmitting the second power signal, which has been converted by the wireless power signal converting unit, through the power transmission antenna by means of the magnetic resonance method; a wireless power signal detecting unit for detecting and outputting resonance frequency and required power of the at least one second wireless power receiving device; and a controller for controlling the wireless power signal distributing unit and the power converting unit according to the required power detected by the power detecting unit so that the required power is supplied to the wireless power receiving device, and controlling the wireless power signal converting unit and the wireless power signal transmitting unit so that the second power signal corresponding to the required power and the resonance frequency detected by the wireless power signal detecting unit is transmitted.

Preferably, the power receiving antenna of the first wireless power receiving device includes a resonance coil for receiving the wireless power signal from the outside.

Preferably, the power transmission antenna of the first wireless power receiving device includes a resonance coil for emitting a wireless power signal to the outside; and an electricity-feeding loop for receiving the second power signal from the wireless power signal transmitting unit and inducing the second power signal to the resonance coil.

Preferably, the at least one second wireless power receiving device includes a wireless power signal receiving unit for wirelessly receiving the second power signal, which has been wirelessly received from the first wireless power receiving device, through a power receiving antenna by means of magnetic resonance method; and a power converting unit for converting the second power signal received from the wireless power signal receiving unit into useable electricity and supplying the useable electricity to a power source unit of the wireless power receiving device.

Preferably, the power receiving antenna of the at least one second wireless power receiving device includes a resonance coil for receiving the wireless power signal from the outside; and an electricity-feeding loop for supplying the second power signal from the resonance coil to the wireless power signal receiving unit.

Preferably, the wireless power transmission and receiving system may further include at least one relay coil unit provided in a space between the first wireless power receiving device and the second wireless power receiving device to relay the second power signal transmitted from the first wireless power receiving device.

Preferably, at least one relay coil unit includes a resonance coil which resonates at the same resonance frequency of the second band as the second power signal.

In another aspect of the present disclosure, there is also provided a wireless power transmission and receiving apparatus capable of wirelessly receiving power and retransmitting the power, which includes a wireless power signal receiving unit for wirelessly receiving a first power signal having a resonance frequency of a first band, which has been wirelessly transmitted from the outside, through a power receiving antenna by means of a magnetic resonance method; a power converting unit for converting the first power signal received from the wireless power signal receiving unit into useable electricity and supplying the useable electricity to a power source unit of a wireless power receiving device; a wireless power signal distributing unit provided between the wireless power signal receiving unit and the power converting unit to output a wireless power signal required for converting the useable electricity to the power converting unit, and separating and outputting a surplus wireless power signal not converted into the useable electricity; a wireless power signal converting unit for receiving the surplus wireless power signal output from the wireless power signal distributing unit and converting the surplus wireless power signal into a second power signal having a resonance frequency of a second band; a wireless power signal transmitting unit for wirelessly transmitting the second power signal, which has been converted by the wireless power signal converting unit, through the power transmission antenna by means of the magnetic resonance method; a wireless power signal detecting unit for detecting and outputting resonance frequency and required power of at least one second wireless power receiving device; and a controller for controlling the wireless power signal distributing unit and the power converting unit according to the required power detected by the power detecting unit so that the required power is supplied to the wireless power receiving device, and controlling the wireless power signal converting unit and the wireless power signal transmitting unit so that the second power signal corresponding to the required power and the resonance frequency detected by the wireless power signal detecting unit is transmitted.

According to the present disclosure, since the wireless power transmission and receiving system using a magnetic resonance method is configured so that a high-power wireless power receiving device retransmits surplus power to a low-power wireless power receiving device, it is possible to provide a wireless power transmission and receiving system capable of multi charge which may transmit and receive wireless power to/from a plurality of wireless power receiving devices easy and conveniently. In addition, by installing a wireless power transmission device to be buried in a building such as a house or an apartment house, it is possible to enhance space utilization in the building. Moreover, by adding a relay coil for relaying the transmission of wireless power, it is possible to transmit wireless power to a wireless power receiving device at a longer distance.

Other objects and aspects of the present disclosure will become apparent from the following descriptions of the embodiments with reference to the accompanying drawings in which:

Fig. 1 iswireless power transmission and receiving system capable of multi charge according to a preferred embodiment of the present disclosure; and

Fig. 2 is a block diagram showing the configuration of a wireless power transmission and receiving system capable of multi charge according to a preferred embodiment of the present disclosure.

Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Prior to the description, it should be understood that the terms used in the specification and the appended claims should not be construed as limited to general and dictionary meanings, but interpreted based on the meanings and concepts corresponding to technical aspects of the present disclosure on the basis of the principle that the inventor is allowed to define terms appropriately for the best explanation. Therefore, the description proposed herein is just a preferable example for the purpose of illustrations only, not intended to limit the scope of the disclosure, so it should be understood that other equivalents and modifications could be made thereto without departing from the spirit and scope of the disclosure.

Fig. 1 iswireless power transmission and receiving system capable of multi charge according to a preferred embodiment of the present disclosure, and Fig. 2 is a block diagram showing the configuration of a wireless power transmission and receiving system capable of multi charge according to a preferred embodiment of the present disclosure.Referring to Figs. 1 and 2, the wireless power transmission and receiving system capable of multi charge according to the present disclosure includes a wireless power transmission device 100 buried in a wall 1 of a building to transmit wireless power to the outside by means of a magnetic resonance method, a first wireless power receiving device 200 disposed adjacent to the wireless power transmission device 100 to receive wireless power from the wireless power transmission device 100 by means of magnetic resonance method and transmit a surplus wireless power, which remains after the wireless power is used, to the outside again by means of the magnetic resonance method, and at least one second wireless power receiving device 300 disposed spaced apart from the first wireless power receiving device 200 by a predetermined distance to receive wireless power from the first wireless power receiving device 200 by means of the magnetic resonance method. At this time, at least one relay coil unit 400 may be provided in a space between the first wireless power receiving device 200 and the second wireless power receiving device 300 to relay the wireless power transmitted from the first wireless power receiving device 200 so that the wireless power may be transmitted to a longer distance.

Here, the first wireless power receiving device 200 and the second wireless power receiving device 300 are devices capable of receiving wireless power by means of the resonance method and using the received wireless power as a driving power or to charge a battery. At this time, the first wireless power receiving device 200 is applied to a wireless power receiving device such as a wall-mounted TV, a stereo system and a desktop, which demands relatively higher power in comparison to existing portable electronic devices, and the second wireless power receiving device 300 is applied to a wireless power receiving device such as a portable electronic device and small home appliances, which requires low power and has a battery serving as a driving power source by charging and discharging.

The wireless power transmission device 100 is configured to transmit wireless power to the first wireless power receiving device 200 such as a wall-mounted TV, a stereo system and a desktop, which demands relatively higher power in comparison to existing portable electronic devices, and is also configured so that the first wireless power receiving device 200 may be disposed adjacent thereto. The wireless power transmission device 100 may be buried in the wall 1 of a building, attached to the wall 1 or configured to stand alone. However, the present disclosure is not limited to the configuration of the wireless power transmission device 100.

In detail, as shown in Fig. 2, the wireless power transmission device 100 includes a power transmission antenna 110, a power supply unit 120, a wireless power signal generating unit 131, a wireless power signal transmitting unit 132, a wireless power signal detecting unit 133, and a controller 140.

The power supply unit 120 receives AC power which is normal power, converts the AC power into DC power, and supplies the DC power to the wireless power signal generating unit 131.

The wireless power signal generating unit 131 generates a first power signal having a resonance frequency of a first band when the DC power is supplied from the power supply unit 120 so that the wireless power may be transmitted by means of magnetic resonance.

The wireless power signal transmitting unit 132 adjusts an impedance between the wireless power signal generating side and the power transmission antenna 110 so that the first power signal generated by the wireless power signal generating unit 131 may be transmitted to the outside in an optimal state, and then transmits the first power signal to the power transmission antenna 110.

The wireless power signal detecting unit 133 detects and outputs required power of the first wireless power receiving device 200 which receives the wireless power.

The controller 140 controls components of the wireless power transmission device 100, and particularly controls the wireless power signal generating unit 131 and the wireless power signal transmitting unit 132 so that a wireless power signal corresponding to the required power detected by the wireless power signal detecting unit 133 may be transmitted.

The wireless power signal transmission device 100 according to the present disclosure preferably has a relatively lower frequency in comparison to the resonance frequency of the first band of the first power signal so that a harmful influence caused by the frequency to peripheral devices is reduced while a high-power wireless power is transmitted. In addition, the first wireless power receiving device 200 which receives wireless power from the wireless power transmission device 100 is preferably disposed adjacent to the wireless power transmission device 100. In this case, since the wireless power signal transmission device 100 and the first wireless power receiving device 200 are located in adjacent fields, wireless power may be easily transmitted even though the power transmission antenna 110 is configured only with a resonance coil without using the electricity-feeding loop, and also the transmission efficiency of the wireless power may be enhanced.

As described above, the first wireless power receiving device 200 is applied to a wireless power receiving device such as a wall-mounted TV, a stereo system and a desktop, which demands relatively higher power in comparison to existing portable electronic devices and is located to be disposed adjacent to the wireless power transmission device 100, and the first wireless power receiving device 200 also receives the first power signal, wirelessly transmitted from the wireless power transmission device 100, by means of the magnetic resonance method, converts the first power signal into useable power and provides the useable power to the wireless power receiving device.

In the present disclosure, the first wireless power receiving device 200 receives a wireless power signal by means of the magnetic resonance method, converts the wireless power signal into useable electricity and provides the useable electricity to the wireless power receiving device. In addition, the first wireless power receiving device 200 is also configured to be capable of retransmitting a surplus wireless power signal, which remains after transmitting power to the wireless power receiving device, to the outside again by means of the magnetic resonance method.

In detail, as shown in Fig. 2, the first wireless power receiving device 200 includes a wireless power signal receiving unit 221, a power converting unit 222, a power detecting unit 223, a wireless power signal distributing unit 231, a wireless power signal converting unit 232, a wireless power signal transmitting unit 233, a wireless power signal detecting unit 234, and a controller 240.

Basically, the first wireless power receiving device 200 wirelessly receives the first power signal, which has been wirelessly transmitted from the wireless power transmission device 100, at the wireless power signal receiving unit 221 through a power receiving antenna 210 by means of the magnetic resonance method, converts the first power signal received by the power converting unit 222 into useable electricity corresponding to the required power of the wireless power receiving device, and supplies the useable electricity to a power source unit 230 of the wireless power receiving device.

Together with the wireless power signal receiving unit 221 and the power converting unit 222, the first wireless power receiving device 200 according to the present disclosure is configured to be capable of retransmitting a surplus wireless power signal through the power detecting unit 223, the wireless power signal distributing unit 231, the wireless power signal converting unit 232, the wireless power signal transmitting unit 233, the wireless power signal detecting unit 234 and the controller 240.

The power detecting unit 222 detects and outputs the required power at the power source unit 230 of the wireless power receiving device. The output required power detection information is applied to the controller 240, described later.

The wireless power signal distributing unit 231 is provided between the wireless power signal receiving unit 221 and the power converting unit 222, outputs the first power signal, which is required to be converted into useable electricity corresponding to the required power detected by the power detecting unit 222, to the power converting unit 222, separates a surplus wireless power signal remaining without being converted into useable electricity, and outputs the surplus wireless power signal to the wireless power signal converting unit 232.

The wireless power signal converting unit 232 converts the surplus wireless power signal into a second power signal having a resonance frequency of a second band so that the surplus wireless power signal output from the wireless power signal distributing unit 231 may be wirelessly transmitted again by means of magnetic resonance.

Here, the resonance frequency of the second band of the second power signal is preferably higher than the resonance frequency of the first band of the first power signal. In case of the first wireless power receiving device 200, since high-power wireless power is transmitted, it is advantageous to use a wireless power signal having a low resonance frequency in order to reduce any harmful effect and enhance the wireless power transmission efficiency. Meanwhile, in case of the second wireless power receiving device 300, since the second wireless power receiving device 300 is applied to a wireless power receiving device using low-power wireless power such as a portable electronic device and a small home appliance, a harmful effect caused by the frequency is relatively small, and it is also advantageous to use a wireless power signal having a high resonance frequency in order reduce the size of a power receiving antenna which receives wireless power.

The wireless power signal transmitting unit 233 adjusts an impedance between the wireless power signal providing side and the power transmission antenna 220 and then transmits the second power signal to the power transmission antenna 250 so that the second power signal converted by the wireless power signal converting unit 232 may be transmitted to the outside in an optimal status. Here, the power transmission antenna 250 includes a resonance coil 252 for emitting a wireless power signal to the outside, and an electricity-feeding loop 251 for receiving the second power signal from the wireless power signal transmitting unit 233 and inducing the second power signal to the resonance coil 252.

The wireless power signal detecting unit 234 detects and outputs resonance frequency and required power of at least one second wireless power receiving device 300 which receives the wireless power.

The controller 240 controls components of the first wireless power receiving device 200 as a whole. In particular, when receiving a wireless power signal, the controller 240 controls the wireless power signal distributing unit 231 and the power converting unit 222 according to the required power at the power source unit 230 of the wireless power receiving device, detected by the power detecting unit 223, and controls useable electricity corresponding to the required power to be supplied to the power source unit 230 of the wireless power receiving device. In addition, when retransmitting the wireless power signal, the controller 240 controls the wireless power signal converting unit 232 and the wireless power signal transmitting unit 233 so that the second power signal corresponding to the resonance frequency and the required power detected by the wireless power signal detecting unit 234 may be transmitted.

Additionally, the controller 240 may monitor resonance frequency and required power of at least one second wireless power receiving device 300 through the wireless power signal detecting unit 234 and then adjust resonance frequency or power level of the second power signal so that wireless power may be suitably transmitted to at least one second wireless power receiving device 300 in an optimal status.

In addition, in the case some of the second wireless power receiving devices 300 have different required powers or resonance frequencies, the controller 240 may control so that the second power signal to be suitably converted for the second wireless power receiving devices 300, which demand different required powers and resonance frequencies, by means of time-division control.

The first wireless power receiving device 200 according to the present disclosure may be configured to convert a wireless power signal into useable electricity through the wireless power signal converting unit 232, convert a remaining surplus wireless power signal into a second power signal and then retransmit the second power signal, without using a separate wireless power signal generating unit for generating a wireless power signal used for transmitting wireless power by means of magnetic resonance. In this case, it is possible to simplify the circuit and enhance the wireless power utilization efficiency.

If the above configuration is used, since the wireless power which the first wireless power receiving device 200 receives from the wireless power transmission device 100 corresponds to high power, as the amount of wireless power transmitted from the wireless power transmission device 100 increases, the wireless power transmission efficiency is enhanced. In this case, since the first wireless power receiving device 200 receives a greater amount of wireless power than used, an unused surplus wireless power is generated. Therefore, by retransmitting the remaining surplus wireless power, it is possible to enhance both the wireless power transmission efficiency and the wireless power utilization efficiency.

As described above, the second wireless power receiving device 300 is applied to a low-power wireless power receiving device such as a portable electronic device and a small home appliance, which has a battery serving as a driving power source by charging and discharging. The second wireless power receiving device 300 is located spaced apart from the first wireless power receiving device 200 by a predetermined distance, receives the second power signal, wirelessly transmitted from the first wireless power receiving device 200, by means of the magnetic resonance method, converts the second power signal into useable power, and provides the useable power to the wireless power receiving device.

In detail, as shown in Fig. 2, the second wireless power receiving device 300 includes a wireless power signal receiving unit 321 and a power converting unit 322.

The wireless power signal receiving unit 321 wirelessly receives the second power signal, which has been wirelessly transmitted from the first wireless power receiving device 200, through the power receiving antenna 310 by means of the magnetic resonance method and supplies the second power signal to the power converting unit 322.

The power converting unit 322 converts the second power signal supplied from the wireless power signal receiving unit 321 into useable electricity corresponding to required power of the wireless power receiving device and supplies the useable electricity to the power source unit 330 of the wireless power receiving device.

Here, the power receiving antenna 310 includes a resonance coil 312 for receiving the second power signal transmitted from the first wireless power receiving device 200, and an electricity-feeding loop 311 for supplying the second power signal from the resonance coil 312 to the wireless power signal receiving unit 321.

Meanwhile, in the wireless power transmission and receiving apparatus capable of multi charge according to the present disclosure, at least one relay coil unit 400 for relaying the second power signal transmitted from the first wireless power receiving device 200 may be further provided in the space between the first wireless power receiving device 200 and the second wireless power receiving device 300.

At least one relay coil unit 400 includes a resonance coil 410 which resonates at the same resonance frequency of the second band as the second power signal. In other words, the resonance coil 410 of the relay coil unit 400 resonates with the power transmission antenna 220 of the first wireless power receiving device 200 and also resonates with resonance coils 410 of adjacent relay coil units 400, thereby further extending the transmission distance of the second power signal.

The present disclosure has been described in detail. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the disclosure, are given by way of illustration only, since various changes and modifications within the spirit and scope of the disclosure will become apparent to those skilled in the art from this detailed description.

Claims (16)

  1. A wireless power transmission and receiving system capable of multi charge, comprising:
    a wireless power transmission device for generating a first power signal having a resonance frequency of a first band when a normal power is supplied, and transmitting the generated first power signal to the outside by means of a magnetic resonance method;
    a first wireless power receiving device for converting the first power signal received by means of the magnetic resonance method into useable electricity, converting a surplus wireless power signal, whish has not been converted into the useable electricity, into a second power signal having a resonance frequency of a second band, and retransmitting the generated second power signal to the outside by means of the magnetic resonance method; and
    at least one second wireless power receiving device for converting the second power signal, which has been received by means of the magnetic resonance method, into useable electricity.
  2. The wireless power transmission and receiving system capable of multi charge according to claim 1, wherein the first wireless power receiving device is provided at a wireless power receiving device which demands relatively higher useable electricity in comparison to the second wireless power receiving device.
  3. The wireless power transmission and receiving system capable of multi charge according to claim 1, wherein the resonance frequency of the first band of the first power signal is relatively lower than the resonance frequency of the second band of the second power signal.
  4. The wireless power transmission and receiving system capable of multi charge according to claim 1, wherein the wireless power transmission device includes:
    a power supply unit for receiving AC power of the normal power into DC power and supplying the DC power;
    a wireless power signal generating unit for generating a first power signal having the resonance frequency of the first band when the DC power is supplied from the power supply unit;
    a wireless power signal transmitting unit for wirelessly transmitting the first power signal generated by the wireless power signal generating unit through a power transmission antenna by means of the magnetic resonance method;
    a wireless power signal transmitting unit for wirelessly transmitting the first power signal generated by the wireless power signal generating unit through the power transmission antenna to the outside air;
    a wireless power detecting unit for detecting and outputting required power of the first wireless power receiving device; and
    a controller for controlling the wireless power signal generating unit and the wireless power signal transmitting unit so that a wireless power signal corresponding to the required power detected by the wireless power detecting unit is transmitted.
  5. The wireless power transmission and receiving system capable of multi charge according to claim 4, wherein the power transmission antenna of the wireless power transmission device includes a resonance coil for emitting the wireless power signal to the outside.
  6. The wireless power transmission and receiving system capable of multi charge according to claim 1, wherein the first wireless power receiving device includes:
    a wireless power signal receiving unit for wirelessly receiving a first power signal, which has been wirelessly transmitted by the wireless power transmission device, through a power receiving antenna by means of the magnetic resonance method;
    a power converting unit for converting the first power signal, which has been received by the wireless power signal receiving unit, into useable electricity and supplying the useable electricity to a power source unit of the wireless power receiving device;
    a power detecting unit for detecting and outputting required power of the wireless power receiving device;
    a wireless power signal distributing unit provided between the wireless power signal receiving unit and the power converting unit to output a wireless power signal required for converting the useable electricity to the power converting unit, and separating and outputting a surplus wireless power signal not converted into the useable electricity;
    a wireless power signal converting unit for receiving the surplus wireless power signal output from the wireless power signal distributing unit and converting the surplus wireless power signal into a second power signal having the resonance frequency of the second band;
    a wireless power signal transmitting unit for wirelessly transmitting the second power signal, which has been converted by the wireless power signal converting unit, through the power transmission antenna by means of the magnetic resonance method;
    a wireless power signal detecting unit for detecting and outputting resonance frequency and required power of the at least one second wireless power receiving device; and
    a controller for controlling the wireless power signal distributing unit and the power converting unit according to the required power detected by the power detecting unit so that the required power is supplied to the wireless power receiving device, and controlling the wireless power signal converting unit and the wireless power signal transmitting unit so that the second power signal corresponding to the required power and the resonance frequency detected by the wireless power signal detecting unit is transmitted.
  7. The wireless power transmission and receiving system capable of multi charge according to claim 6, wherein the power receiving antenna of the first wireless power receiving device includes a resonance coil for receiving the wireless power signal from the outside.
  8. The wireless power transmission and receiving system capable of multi charge according to claim 6, wherein the power transmission antenna of the first wireless power receiving device includes:
    a resonance coil for emitting a wireless power signal to the outside; and
    an electricity-feeding loop for receiving the second power signal from the wireless power signal transmitting unit and inducing the second power signal to the resonance coil.
  9. The wireless power transmission and receiving system capable of multi charge according to claim 1, wherein the at least one second wireless power receiving device includes:
    a wireless power signal receiving unit for wirelessly receiving the second power signal, which has been wirelessly received from the first wireless power receiving device, through a power receiving antenna by means of magnetic resonance method; and
    a power converting unit for converting the second power signal received from the wireless power signal receiving unit into useable electricity and supplying the useable electricity to a power source unit of the wireless power receiving device.
  10. The wireless power transmission and receiving system capable of multi charge according to claim 9, wherein the power receiving antenna of the at least one second wireless power receiving device includes:
    a resonance coil for receiving the wireless power signal from the outside; and
    an electricity-feeding loop for supplying the second power signal from the resonance coil to the wireless power signal receiving unit.
  11. The wireless power transmission and receiving system capable of multi charge according to claim 1, further comprising at least one relay coil unit provided in a space between the first wireless power receiving device and the second wireless power receiving device to relay the second power signal transmitted from the first wireless power receiving device.
  12. The wireless power transmission and receiving system capable of multi charge according to claim 11, wherein the at least one relay coil unit includes a resonance coil which resonates at the same resonance frequency of the second band as the second power signal.
  13. A wireless power transmission and receiving apparatus capable of wirelessly receiving power and retransmitting the power, the apparatus comprising:
    a wireless power signal receiving unit for wirelessly receiving a first power signal having a resonance frequency of a first band, which has been wirelessly transmitted from the outside, through a power receiving antenna by means of a magnetic resonance method;
    a power converting unit for converting the first power signal received from the wireless power signal receiving unit into useable electricity and supplying the useable electricity to a power source unit of a wireless power receiving device;
    a wireless power signal distributing unit provided between the wireless power signal receiving unit and the power converting unit to output a wireless power signal required for converting the useable electricity to the power converting unit, and separating and outputting a surplus wireless power signal not converted into the useable electricity;
    a wireless power signal converting unit for receiving the surplus wireless power signal output from the wireless power signal distributing unit and converting the surplus wireless power signal into a second power signal having a resonance frequency of a second band;
    a wireless power signal transmitting unit for wirelessly transmitting the second power signal, which has been converted by the wireless power signal converting unit, through the power transmission antenna by means of the magnetic resonance method;
    a wireless power signal detecting unit for detecting and outputting resonance frequency and required power of at least one second wireless power receiving device; and
    a controller for controlling the wireless power signal distributing unit and the power converting unit according to the required power detected by the power detecting unit so that the required power is supplied to the wireless power receiving device, and controlling the wireless power signal converting unit and the wireless power signal transmitting unit so that the second power signal corresponding to the required power and the resonance frequency detected by the wireless power signal detecting unit is transmitted.
  14. The wireless power transmission and receiving apparatus according to claim 13, wherein the resonance frequency of the first band of the first power signal is relatively lower than the resonance frequency of the second band of the second power signal.
  15. The wireless power transmission and receiving apparatus according to claim 13, wherein the power receiving antenna includes a resonance coil for receiving the wireless power signal from the outside.
  16. The wireless power transmission and receiving apparatus according to claim 13, wherein the power transmission antenna includes:
    a resonance coil for emitting a wireless power signal to the outside; and
    an electricity-feeding loop for receiving the second power signal from the wireless power signal transmitting unit and inducing the second power signal to the resonance coil.
PCT/KR2012/009305 2011-11-07 2012-11-07 Wireless power transmission and receiving system capable of multi charge WO2013069951A1 (en)

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KR20130050094A (en) 2013-05-15
WO2013069951A4 (en) 2013-07-04

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