WO2013151259A1 - Device and system for wireless power transmission using transmission coil array - Google Patents

Device and system for wireless power transmission using transmission coil array Download PDF

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Publication number
WO2013151259A1
WO2013151259A1 PCT/KR2013/002433 KR2013002433W WO2013151259A1 WO 2013151259 A1 WO2013151259 A1 WO 2013151259A1 KR 2013002433 W KR2013002433 W KR 2013002433W WO 2013151259 A1 WO2013151259 A1 WO 2013151259A1
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WO
WIPO (PCT)
Prior art keywords
power
power transmission
wireless
wireless power
antenna
Prior art date
Application number
PCT/KR2013/002433
Other languages
French (fr)
Inventor
Min Seok Han
Young Sun Kim
Jeong Man WHANG
Un Kyu Park
Ji Hyung Lee
Original Assignee
Ls Cable & System Ltd.
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Filing date
Publication date
Application filed by Ls Cable & System Ltd. filed Critical Ls Cable & System Ltd.
Publication of WO2013151259A1 publication Critical patent/WO2013151259A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
    • H02J50/402—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
    • H04B5/24—Inductive coupling
    • H04B5/26—Inductive coupling using coils
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
    • H04B5/79—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for data transfer in combination with power transfer

Definitions

  • the present invention relates to a device and system for wireless power transmission using a transmission coil array.
  • a magnetic resonance type wireless power transmission system has a problem in that power transmission efficiency is suddenly lowered according to coil orientation between a transmission coil of a wireless power transmission device and a receiving coil of a wireless power receiving device.
  • power transmission efficiency may be lowered depending upon how the wireless power receiving device is placed.
  • the present invention has been made in view of the above problems, and it is an object of the present invention to provide a wireless power transmission device that is capable of transmitting power using a transmission coil array including two or more transmission coils, thereby improving transmission efficiency, and a wireless power transmission system including the same.
  • a wireless power transmission system comprising a wireless power transmission device to transmit power in a wireless fashion and a wireless power receiving device to receive the power in the wireless fashion
  • the wireless power transmission device comprises a power transmission antenna unit
  • the wireless power receiving device comprises a power receiving antenna unit
  • the power transmission antenna unit and the power receiving antenna unit magnetically resonating at the same resonant frequency to transmit the power from the wireless power transmission device to the wireless power receiving device
  • the power transmission antenna unit comprises two or more antenna sets, each of which comprises a power transmission antenna and a transmission side resonant coil
  • the power receiving antenna unit comprises a power receiving antenna and a receiving side resonant coil.
  • the wireless power transmission device may further comprises a power distribution unit to distribute power to the two or more antenna sets of the power transmission antenna unit.
  • the power distribution unit may controls phases of power signals transmitted to the two or more antenna sets.
  • the respective power signals may transmitted to the two or more antenna sets have the same phase or different phases.
  • the power distribution unit may comprises one of a Wilkinson power divider and a hybrid coupler.
  • a wireless power transmission device comprising a direct current (DC) power converting unit to receive external alternating current (AC) power and to rectify the AC power into DC power, a power amplification unit to convert the DC power into a high-frequency power signal and two or more antenna sets to receive the high-frequency power signal and to transmit the received high-frequency power signal to a wireless power receiving device, wherein each of the antenna sets comprises a power transmission antenna to generate a magnetic field using the received high-frequency power signal and a transmission side resonant coil to generate a non-radial electromagnetic wave using a power signal magnetically induced from the power transmission antenna and to transmit the generated non-radial electromagnetic wave to the wireless power receiving device and the transmission side resonant coil magnetically resonates with a receiving side resonant coil of the wireless power receiving device at the same resonant frequency.
  • DC direct current
  • AC alternating current
  • a power amplification unit to convert the DC power into a high-frequency power signal
  • two or more antenna sets to receive the high-frequency
  • the wireless power transmission device may further comprising a power distribution unit to uniformly distribute power to the two or more antenna sets.
  • the power distribution unit may comprises one of a Wilkinson power divider and a hybrid coupler.
  • the power distribution unit may controls phases of power signals distributed to the two or more antenna sets.
  • the power distribution unit may controls the respective power signals input to the two or more antenna sets to have the same phase or different phases.
  • the power distribution unit may distributes the entirety of the input power to one of the two or more antenna sets.
  • the two or more antenna may sets are spaced apart from each other by a predetermined distance to avoid mutual coupling therebetween.
  • FIG. 1 is a view illustrating a wireless power transmission system using a transmission coil array according to an embodiment of the present invention
  • FIG. 2 is a view illustrating the operations of a power transmission antenna unit and a power receiving antenna unit of the wireless power transmission system of FIG. 1;
  • FIG. 3 is a block diagram showing the detailed construction of a wireless power transmission device according to an embodiment of the present invention.
  • FIG. 4 is a block diagram showing the detailed construction of a wireless power receiving device according to an embodiment of the present invention.
  • FIG. 5 is a view illustrating the operation of a power distribution unit of the wireless power transmission device according to the embodiment of the present invention.
  • FIGS. 6A and 6B are views illustrating the operation of the wireless power transmission device according to the embodiment of the present invention in an in-phase power transmission mode and a phase difference power transmission mode;
  • FIGS. 7A and 7B are views illustrating the operation of the wireless power transmission device according to the embodiment of the present invention in a single coil power transmission mode and a multiple coil power transmission mode;
  • FIGS. 8A and 8B are views showing comparison between transmission efficiency in the single coil power transmission mode and the multiple coil power transmission mode based on an alignment angle of a receiving side resonant coil.
  • a wireless power transmission device is a device that converts an external input and supplies the converted input to an external wireless power receiving device via an antenna.
  • the wireless power transmission device may be an electric instrument with a chargeable battery.
  • the wireless power transmission device may be a mobile terminal, such as a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), or a navigator.
  • the wireless power transmission device may include a wall mounted type television(TV), a lighting stand, an electronic picture frame, and a cleaner.
  • FIG. 1 is a view illustrating a wireless power transmission system using a transmission coil array according to an embodiment of the present invention.
  • the wireless power transmission system includes a wireless power transmission device 100 and a wireless power receiving device 200.
  • the wireless power transmission system transmits power from the wireless power transmission device 100 to the wireless power receiving device 200 in a magnetic resonance mode.
  • the wireless power transmission device 100 rectifies alternating current (AC) power input from an external input power supply into direct current (DC) power, converts high-frequency AC power (for example, 10V, 200kHz) through a DC-AC conversion circuit for wireless power transmission, and transmits the high-frequency AC power to the wireless power receiving device 200 via a power transmission antenna unit 110.
  • AC alternating current
  • DC direct current
  • the wireless power receiving device 200 receives a power signal transmitted from the wireless power transmission device 100.
  • the wireless power receiving device 200 may include a power receiving antenna unit 210.
  • the power transmission antenna unit 110 and the power receiving antenna unit 210 In a case in which power is transmitted in a magnetic resonance mode, it is necessary for the power transmission antenna unit 110 and the power receiving antenna unit 210 to have the same or almost the same resonant frequency. In this case, an energy transmission channel based on resonant coupling is formed between the power transmission antenna unit 110 and the power receiving antenna unit 210. A power signal output from the power transmission antenna unit 110 is transmitted to the power receiving antenna unit 210 via the energy transmission channel.
  • the power signal input to the wireless power receiving device 200 via the power receiving antenna unit 210 passes through a rectification circuit and a stabilization circuit in the wireless power receiving device 200 into usable power.
  • the converted power is transmitted to a load device 300 connected to the wireless power receiving device 200 to charge the load device 300 or to provide driving power to the wireless power receiving device 200.
  • FIG. 2 is a view illustrating the operations of the power transmission antenna unit and the power receiving antenna unit of the wireless power transmission system according to the embodiment of the present invention.
  • the wireless power transmission system transmits a power signal from the power transmission antenna unit 110 of the wireless power transmission device 100 to the power receiving antenna unit 210 of the wireless power receiving device 200 in a magnetic resonance mode.
  • the power transmission antenna unit 110 and the power receiving antenna unit 210 have the same or almost the same resonant frequency, and therefore, power transmission from the power transmission antenna unit 110 to the power receiving antenna unit 210 is performed at optimum efficiency in a resonant state in which the power transmission antenna unit 110 and the power receiving antenna unit 210 are matched based on the resonant frequency.
  • the power transmission antenna unit 110 includes a power transmission antenna 112 and a transmission side resonant coil 114.
  • the power receiving antenna unit 210 includes a power receiving antenna 212 and a receiving side resonant coil 214.
  • the transmission side resonant coil 114 and the receiving side resonant coil 214 may be configured in a loop form.
  • the loop form may be a spiral loop or a helical loop.
  • Power may be transmitted from the power transmission antenna 112 to the transmission side resonant coil 114 in a magnetic induction mode.
  • a power signal absorbed by the receiving side resonant coil 214 may be transmitted to the power receiving antenna 212 in a magnetic induction mode.
  • An energy transmission channel based on mutual resonance at the same or almost the same resonant frequency is formed between the transmission side resonant coil 114 and the receiving side resonant coil 214.
  • a power signal output from the transmission side resonant coil 114 is transmitted to the receiving side resonant coil 214 via the energy transmission channel according to magnetic resonance.
  • FIG. 3 is a block diagram showing the detailed construction of a wireless power transmission device 100 according to an embodiment of the present invention.
  • the wireless power transmission device 100 includes a power transmission antenna unit 110, a DC power converting unit 120, a power amplification unit 130, an impedance matching unit 140, and a power distribution unit 150.
  • the DC power converting unit 120 receives external AC power and rectifies the AC power into DC power.
  • the power amplification unit 130 converts the rectified DC power into an AC type high-frequency power signal for power transmission. At this time, the converted high-frequency power may have a wavelength of 200 kHz, 1 MHz, 6.78 MHz, 13.56 MHz, 1.8 MHz, etc.
  • the high-frequency power signal may be modulated to contain data to be transmitted to the wireless power receiving device 200 by a modulation circuit (not shown). Also, the impedance matching unit 140 may perform impedance matching with respect to the power transmission antenna unit 110.
  • the power transmission antenna unit 110 may be configured to have a structure in which one or more antenna sets, each of which includes a power transmission antenna 112 and a transmission side resonant coil 114, are arranged.
  • the power transmission antenna 112 receives a high-frequency power signal and transmits energy corresponding to the high-frequency power signal to the transmission side resonant coil 114.
  • the power transmission antenna 112 may be spaced apart from the transmission side resonant coil 114 by the optimum distance for impedance matching.
  • the transmission side resonant coil 114 receives the energy from the power transmission antenna 112 through magnetic induction and generates a non-radial electromagnetic wave through resonance.
  • the power transmission antenna 112 may receive a portion of the high-frequency power signal through the power distribution unit 150, which will hereinafter be described, and transmit the received portion of the high-frequency power signal to the transmission side resonant coil 114.
  • the power distribution unit 150 transmits the input high-frequency power signal to the power transmission antenna 112.
  • the power distribution unit 150 may distribute the input high-frequency power signal to the respective power transmission antennas 112.
  • the detailed construction of the power distribution unit 150 and a method of distributing power to a plurality of power transmission antennas 112 will hereinafter be described in detail.
  • FIG. 4 is a block diagram showing the detailed construction of a wireless power receiving device 200 according to an embodiment of the present invention.
  • the wireless power receiving device 200 includes a power receiving antenna unit 210, a rectification unit 220, a voltage control unit 230, and a charging unit 240.
  • the power receiving antenna unit 210 includes a power receiving antenna 212 and a receiving side resonant coil 214 (see FIG. 2).
  • the receiving side resonant coil 214 receives a power signal output from the transmission side resonant coil 114 of the wireless power transmission device 100 in a wireless fashion.
  • the power signal received by the receiving side resonant coil 214 is transmitted to the power receiving antenna 212 through electromagnetic induction and is rectified into DC power by the rectification unit 220. Subsequently, the DC power passes through a filtering unit (not shown), by which a high-frequency noise component is removed from the DC power, and is converted into voltage that can be used in a load device by the voltage control unit 230.
  • a filtering unit not shown
  • the charging unit 240 transmits the power converted while passing through the above elements to a load device 300 to charge the load device 300.
  • the operations of the power transmission antenna unit 110 which is configured to include a plurality of antenna sets, and the power distribution unit 150 of the wireless power transmission device 100 according to the embodiment of the present invention will be described in detail.
  • the power transmission antenna unit 110 includes two antenna sets 111 and 115.
  • the antenna set 111 includes a power transmission antenna 112 and a transmission side resonant coil 114.
  • the antenna set 115 includes a power transmission antenna 116 and a transmission side resonant coil 118.
  • the power transmission antenna unit 110 may include two or more antenna sets. For the convenience of description, however, a case in which the power transmission antenna unit 110 includes two antenna sets 111 and 115 will be described as an example.
  • the power distribution unit 150 distributes a power signal to the power transmission antennas 112 and 116. At this time, the size of the power signal distributed to the power transmission antenna 112 and the power transmission antenna 116 may be the same or almost the same.
  • the power distribution unit 150 may extract power equivalent to -3dB from the input power signal and distribute the extracted power to the power transmission antenna 116.
  • the power distribution unit 150 may be a hybrid coupler, a Wilkinson power divider, or another coupler performing a function equivalent thereto.
  • the power distribution unit 150 may have a switching element provided therein. Under control of the switching element, the power distribution unit 150 may transmit the entirety of the power signal to one of the power transmission antennas 112 and 116(single coil power transmission mode) or distribute the power signal to the power transmission antennas 112 and 116 (multiple coil power transmission mode).
  • the power distribution unit 150 may have a phase control circuit provided therein.
  • the power distribution unit 150 may control phases of the power transmission antennas 112 and 116 connected to both output ends of the power distribution unit 150 using the phase control circuit.
  • the phase control circuit may be a well-known circuit.
  • FIG. 6A shows a case in which the antenna set 111 and the antenna set 115 have the same phase (in-phase power transmission mode), and FIG. 6B shows a case in which the antenna set 111 and the antenna set 115 have different phases (phase difference power transmission mode).
  • phase of the power signal output from the power transmission antennas 112 and the phase of the power signal output from the power transmission antennas 116 are the same.
  • phase difference power transmission mode on the other hand, the difference between the phase of the power signal output from the power transmission antennas 112 and the phase of the power signal output from the power transmission antennas 116 may be 180 degrees.
  • power transmission efficiency in each mode is changed according to the relative deployment position between the receiving side resonant coil 214 of the wireless power receiving device 200 and the transmission side resonant coils 114 and 118 (i.e. an alignment angle ⁇ of the receiving side resonant coil 214 with respect to the transmission side resonant coils 114 and 118).
  • the power transmission antenna unit 110 includes a single transmission side resonant coil 114, and the power receiving antenna unit 210 has an arbitrary alignment angle ⁇ as shown in FIG. 7A, as the alignment angle ⁇ of the power receiving antenna unit 210 is increased, the efficiency of power transmission to the wireless power receiving device 200 is decreased as shown in FIG. 8A (single coil power transmission mode).
  • the power transmission antenna unit 110 includes two transmission side resonant coils 114 and 118, and the power receiving antenna unit 210, spaced apart from the power transmission antenna unit 110 by a predetermined distance d, has an arbitrary alignment angle ⁇ as shown in FIG. 7B
  • the alignment angle ⁇ of the power receiving antenna unit 210 is increased, the efficiency of power transmission to the wireless power receiving device 200 is decreased as shown in FIG. 8A in the in-phase power transmission mode.
  • the alignment angle ⁇ of the power receiving antenna unit 210 is increased, the efficiency of power transmission to the wireless power receiving device 200 is increased as shown in FIG. 8A.
  • the power transmission efficiency in the single coil power transmission mode may be higher than that in the in-phase power transmission mode.
  • the two transmission side resonant coils 114 and 118 are preferably spaced apart from each other by a predetermined distance dc to prevent the occurrence of mutual coupling therebetween.
  • the power transmission efficiency in the in-phase power transmission mode becomes lower than that in the 180 degrees phase difference power transmission mode at an alignment angle ⁇ of approximately 60 degrees.
  • the power distribution unit 150 may be controlled so that the power transmission mode is switched from the in-phase power transmission mode to the phase difference power transmission mode at an alignment angle ⁇ of approximately 60 degrees to somewhat compensate for reduction of the power transmission efficiency according to the alignment angle.
  • the power transmission antenna unit includes one or more antenna sets, and two or more power signals having different phases are transmitted to the wireless power receiving device via the power transmission antenna unit. Consequently, it is possible to somewhat compensate for reduction of the power transmission efficiency according to the alignment angle of the wireless power receiving device.
  • the present invention can be widely used in industries related to a device and system for wireless power transmission using a transmission coil array.

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

Abstract

Disclosed herein are a device and system for wireless power transmission using a transmission coil array. The wireless power transmission system includes a wireless power transmission device to transmit power in a wireless fashion and a wireless power receiving device to receive the power in the wireless fashion. A power transmission antenna unit of the wireless power transmission device and a power receiving antenna unit of the wireless power receiving device magnetically resonating at the same resonant frequency to transmit the power from the wireless power transmission device to the wireless power receiving device. The power transmission antenna unit comprises two or more antenna sets, each of which comprises a power transmission antenna and a transmission side resonant coil, and the power receiving antenna unit comprises a power receiving antenna and a receiving side resonant coil.

Description

DEVICE AND SYSTEM FOR WIRELESS POWER TRANSMISSION USING TRANSMISSION COIL ARRAY
The present invention relates to a device and system for wireless power transmission using a transmission coil array.
A magnetic resonance type wireless power transmission system has a problem in that power transmission efficiency is suddenly lowered according to coil orientation between a transmission coil of a wireless power transmission device and a receiving coil of a wireless power receiving device. Particularly for a mobile device, in which a wireless power receiving device is not fixed at a specific position but is frequently movable, power transmission efficiency may be lowered depending upon how the wireless power receiving device is placed.
Consequently, there is a high necessity for a wireless power transmission technology that is capable of maintaining power transmission efficiency at a predetermined level irrespective of positions at which a wireless power receiving device is placed.
For reference, an example of the wireless power transmission system is disclosed in Korean Patent Application Publication No. 2009-0115407 entitled "Wireless resonance power charging system."
Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a wireless power transmission device that is capable of transmitting power using a transmission coil array including two or more transmission coils, thereby improving transmission efficiency, and a wireless power transmission system including the same.
It should be noted that objects of the present invention are not limited to the object of the present invention as mentioned above, and other unmentioned objects of the present invention will be clearly understood from the following description.
In accordance with an aspect of the present invention, the above and other objects can be accomplished by the provision of a wireless power transmission system comprising a wireless power transmission device to transmit power in a wireless fashion and a wireless power receiving device to receive the power in the wireless fashion, wherein the wireless power transmission device comprises a power transmission antenna unit, and the wireless power receiving device comprises a power receiving antenna unit, the power transmission antenna unit and the power receiving antenna unit magnetically resonating at the same resonant frequency to transmit the power from the wireless power transmission device to the wireless power receiving device, the power transmission antenna unit comprises two or more antenna sets, each of which comprises a power transmission antenna and a transmission side resonant coil, and the power receiving antenna unit comprises a power receiving antenna and a receiving side resonant coil.
The wireless power transmission device may further comprises a power distribution unit to distribute power to the two or more antenna sets of the power transmission antenna unit.
The power distribution unit may controls phases of power signals transmitted to the two or more antenna sets.
The respective power signals may transmitted to the two or more antenna sets have the same phase or different phases.
The power distribution unit may comprises one of a Wilkinson power divider and a hybrid coupler.
And in accordance with an aspect of the present invention, the above and other objects can be accomplished by the provision of a wireless power transmission device comprising a direct current (DC) power converting unit to receive external alternating current (AC) power and to rectify the AC power into DC power, a power amplification unit to convert the DC power into a high-frequency power signal and two or more antenna sets to receive the high-frequency power signal and to transmit the received high-frequency power signal to a wireless power receiving device, wherein each of the antenna sets comprises a power transmission antenna to generate a magnetic field using the received high-frequency power signal and a transmission side resonant coil to generate a non-radial electromagnetic wave using a power signal magnetically induced from the power transmission antenna and to transmit the generated non-radial electromagnetic wave to the wireless power receiving device and the transmission side resonant coil magnetically resonates with a receiving side resonant coil of the wireless power receiving device at the same resonant frequency.
The wireless power transmission device may further comprising a power distribution unit to uniformly distribute power to the two or more antenna sets.
The power distribution unit may comprises one of a Wilkinson power divider and a hybrid coupler.
The power distribution unit may controls phases of power signals distributed to the two or more antenna sets.
The power distribution unit may controls the respective power signals input to the two or more antenna sets to have the same phase or different phases.
The power distribution unit may distributes the entirety of the input power to one of the two or more antenna sets.
The two or more antenna may sets are spaced apart from each other by a predetermined distance to avoid mutual coupling therebetween.
In accordance with an aspect of the present invention, it is possible to transmit power using a transmission coil array including two or more transmission coils, thereby preventing lowering of power transmission efficiency depending upon the position of a receiving coil.
The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a view illustrating a wireless power transmission system using a transmission coil array according to an embodiment of the present invention;
FIG. 2 is a view illustrating the operations of a power transmission antenna unit and a power receiving antenna unit of the wireless power transmission system of FIG. 1;
FIG. 3 is a block diagram showing the detailed construction of a wireless power transmission device according to an embodiment of the present invention;
FIG. 4 is a block diagram showing the detailed construction of a wireless power receiving device according to an embodiment of the present invention;
FIG. 5 is a view illustrating the operation of a power distribution unit of the wireless power transmission device according to the embodiment of the present invention;
FIGS. 6A and 6B are views illustrating the operation of the wireless power transmission device according to the embodiment of the present invention in an in-phase power transmission mode and a phase difference power transmission mode;
FIGS. 7A and 7B are views illustrating the operation of the wireless power transmission device according to the embodiment of the present invention in a single coil power transmission mode and a multiple coil power transmission mode; and
FIGS. 8A and 8B are views showing comparison between transmission efficiency in the single coil power transmission mode and the multiple coil power transmission mode based on an alignment angle of a receiving side resonant coil.
The present invention may be modified in various ways and provide various embodiments. The present invention will be described below through a detailed description of specific embodiments illustrated in the accompanying drawings. The detailed description is not intended to limit the present invention and it should be understood that the present invention includes all changes, equivalents, or substitutions within the spirit and scope of the present invention.
In the following description of the present disclosure, a detailed description of known related technologies will be omitted when it may obscure the subject matter of the present disclosure. Numbers or ordinal numbers (for example, first and second) that are used in the description of this specification are merely reference symbols for discriminating between components.
When it is stated that one component is "connected" or "coupled" to another component, it is to be understood that the two components may not only be directly "connected" or "coupled" but may also be indirectly "connected" or "coupled" via another component unless specifically stated otherwise.
A wireless power transmission device is a device that converts an external input and supplies the converted input to an external wireless power receiving device via an antenna. The wireless power transmission device may be an electric instrument with a chargeable battery. For example, the wireless power transmission device may be a mobile terminal, such as a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), or a navigator. Also, the wireless power transmission device may include a wall mounted type television(TV), a lighting stand, an electronic picture frame, and a cleaner.
Now, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a view illustrating a wireless power transmission system using a transmission coil array according to an embodiment of the present invention.
As shown in FIG. 1, the wireless power transmission system according to the embodiment of the present invention includes a wireless power transmission device 100 and a wireless power receiving device 200. The wireless power transmission system transmits power from the wireless power transmission device 100 to the wireless power receiving device 200 in a magnetic resonance mode.
The wireless power transmission device 100 rectifies alternating current (AC) power input from an external input power supply into direct current (DC) power, converts high-frequency AC power (for example, 10V, 200kHz) through a DC-AC conversion circuit for wireless power transmission, and transmits the high-frequency AC power to the wireless power receiving device 200 via a power transmission antenna unit 110.
The wireless power receiving device 200 receives a power signal transmitted from the wireless power transmission device 100. To this end, the wireless power receiving device 200 may include a power receiving antenna unit 210.
In a case in which power is transmitted in a magnetic resonance mode, it is necessary for the power transmission antenna unit 110 and the power receiving antenna unit 210 to have the same or almost the same resonant frequency. In this case, an energy transmission channel based on resonant coupling is formed between the power transmission antenna unit 110 and the power receiving antenna unit 210. A power signal output from the power transmission antenna unit 110 is transmitted to the power receiving antenna unit 210 via the energy transmission channel. The power signal input to the wireless power receiving device 200 via the power receiving antenna unit 210 passes through a rectification circuit and a stabilization circuit in the wireless power receiving device 200 into usable power. The converted power is transmitted to a load device 300 connected to the wireless power receiving device 200 to charge the load device 300 or to provide driving power to the wireless power receiving device 200. Some of the power signal output from the power transmission antenna unit 110, which has not been absorbed by the power receiving antenna unit 210, may be reabsorbed by the power transmission antenna unit 110.
Hereinafter, the operations of the power transmission antenna unit 110 and the power receiving antenna unit 210 will be described in detail.
FIG. 2 is a view illustrating the operations of the power transmission antenna unit and the power receiving antenna unit of the wireless power transmission system according to the embodiment of the present invention.
As shown in FIG. 2, the wireless power transmission system according to the embodiment of the present invention transmits a power signal from the power transmission antenna unit 110 of the wireless power transmission device 100 to the power receiving antenna unit 210 of the wireless power receiving device 200 in a magnetic resonance mode. The power transmission antenna unit 110 and the power receiving antenna unit 210 have the same or almost the same resonant frequency, and therefore, power transmission from the power transmission antenna unit 110 to the power receiving antenna unit 210 is performed at optimum efficiency in a resonant state in which the power transmission antenna unit 110 and the power receiving antenna unit 210 are matched based on the resonant frequency.
The power transmission antenna unit 110 includes a power transmission antenna 112 and a transmission side resonant coil 114. The power receiving antenna unit 210 includes a power receiving antenna 212 and a receiving side resonant coil 214. The transmission side resonant coil 114 and the receiving side resonant coil 214 may be configured in a loop form. For example, the loop form may be a spiral loop or a helical loop.
Power may be transmitted from the power transmission antenna 112 to the transmission side resonant coil 114 in a magnetic induction mode. A power signal absorbed by the receiving side resonant coil 214 may be transmitted to the power receiving antenna 212 in a magnetic induction mode. An energy transmission channel based on mutual resonance at the same or almost the same resonant frequency is formed between the transmission side resonant coil 114 and the receiving side resonant coil 214. A power signal output from the transmission side resonant coil 114 is transmitted to the receiving side resonant coil 214 via the energy transmission channel according to magnetic resonance.
Hereinafter, the detailed constructions of the wireless power transmission device and the wireless power receiving device will be described.
FIG. 3 is a block diagram showing the detailed construction of a wireless power transmission device 100 according to an embodiment of the present invention.
As shown in FIG. 3, the wireless power transmission device 100 includes a power transmission antenna unit 110, a DC power converting unit 120, a power amplification unit 130, an impedance matching unit 140, and a power distribution unit 150.
The DC power converting unit 120 receives external AC power and rectifies the AC power into DC power. The power amplification unit 130 converts the rectified DC power into an AC type high-frequency power signal for power transmission. At this time, the converted high-frequency power may have a wavelength of 200 kHz, 1 MHz, 6.78 MHz, 13.56 MHz, 1.8 MHz, etc.
The high-frequency power signal may be modulated to contain data to be transmitted to the wireless power receiving device 200 by a modulation circuit (not shown). Also, the impedance matching unit 140 may perform impedance matching with respect to the power transmission antenna unit 110.
The power transmission antenna unit 110 may be configured to have a structure in which one or more antenna sets, each of which includes a power transmission antenna 112 and a transmission side resonant coil 114, are arranged. The power transmission antenna 112 receives a high-frequency power signal and transmits energy corresponding to the high-frequency power signal to the transmission side resonant coil 114. The power transmission antenna 112 may be spaced apart from the transmission side resonant coil 114 by the optimum distance for impedance matching. The transmission side resonant coil 114 receives the energy from the power transmission antenna 112 through magnetic induction and generates a non-radial electromagnetic wave through resonance.
Also, the power transmission antenna 112 may receive a portion of the high-frequency power signal through the power distribution unit 150, which will hereinafter be described, and transmit the received portion of the high-frequency power signal to the transmission side resonant coil 114.
The power distribution unit 150 transmits the input high-frequency power signal to the power transmission antenna 112. In a case in which a plurality of power transmission antennas 112 is provided, the power distribution unit 150 may distribute the input high-frequency power signal to the respective power transmission antennas 112. The detailed construction of the power distribution unit 150 and a method of distributing power to a plurality of power transmission antennas 112 will hereinafter be described in detail.
FIG. 4 is a block diagram showing the detailed construction of a wireless power receiving device 200 according to an embodiment of the present invention.
Referring to FIG. 4, the wireless power receiving device 200 includes a power receiving antenna unit 210, a rectification unit 220, a voltage control unit 230, and a charging unit 240.
The power receiving antenna unit 210 includes a power receiving antenna 212 and a receiving side resonant coil 214 (see FIG. 2). The receiving side resonant coil 214 receives a power signal output from the transmission side resonant coil 114 of the wireless power transmission device 100 in a wireless fashion.
The power signal received by the receiving side resonant coil 214 is transmitted to the power receiving antenna 212 through electromagnetic induction and is rectified into DC power by the rectification unit 220. Subsequently, the DC power passes through a filtering unit (not shown), by which a high-frequency noise component is removed from the DC power, and is converted into voltage that can be used in a load device by the voltage control unit 230.
The charging unit 240 transmits the power converted while passing through the above elements to a load device 300 to charge the load device 300.
Hereinafter, the operations of the power transmission antenna unit 110, which is configured to include a plurality of antenna sets, and the power distribution unit 150 of the wireless power transmission device 100 according to the embodiment of the present invention will be described in detail.
Referring to FIG. 5, the power transmission antenna unit 110 includes two antenna sets 111 and 115. The antenna set 111 includes a power transmission antenna 112 and a transmission side resonant coil 114. The antenna set 115 includes a power transmission antenna 116 and a transmission side resonant coil 118. The power transmission antenna unit 110 may include two or more antenna sets. For the convenience of description, however, a case in which the power transmission antenna unit 110 includes two antenna sets 111 and 115 will be described as an example.
The power distribution unit 150 distributes a power signal to the power transmission antennas 112 and 116. At this time, the size of the power signal distributed to the power transmission antenna 112 and the power transmission antenna 116 may be the same or almost the same. For example, the power distribution unit 150 may extract power equivalent to -3dB from the input power signal and distribute the extracted power to the power transmission antenna 116. For example, the power distribution unit 150 may be a hybrid coupler, a Wilkinson power divider, or another coupler performing a function equivalent thereto.
Meanwhile, the power distribution unit 150 may have a switching element provided therein. Under control of the switching element, the power distribution unit 150 may transmit the entirety of the power signal to one of the power transmission antennas 112 and 116(single coil power transmission mode) or distribute the power signal to the power transmission antennas 112 and 116 (multiple coil power transmission mode).
Also, the power distribution unit 150 may have a phase control circuit provided therein. The power distribution unit 150 may control phases of the power transmission antennas 112 and 116 connected to both output ends of the power distribution unit 150 using the phase control circuit. The phase control circuit may be a well-known circuit.
FIG. 6A shows a case in which the antenna set 111 and the antenna set 115 have the same phase (in-phase power transmission mode), and FIG. 6B shows a case in which the antenna set 111 and the antenna set 115 have different phases (phase difference power transmission mode).
In the in-phase power transmission mode, the phase of the power signal output from the power transmission antennas 112 and the phase of the power signal output from the power transmission antennas 116 are the same. In the phase difference power transmission mode, on the other hand, the difference between the phase of the power signal output from the power transmission antennas 112 and the phase of the power signal output from the power transmission antennas 116 may be 180 degrees.
In this case, power transmission efficiency in each mode is changed according to the relative deployment position between the receiving side resonant coil 214 of the wireless power receiving device 200 and the transmission side resonant coils 114 and 118 (i.e. an alignment angle θ of the receiving side resonant coil 214 with respect to the transmission side resonant coils 114 and 118).
In a case in which the power transmission antenna unit 110 includes a single transmission side resonant coil 114, and the power receiving antenna unit 210 has an arbitrary alignment angle θ as shown in FIG. 7A, as the alignment angle θ of the power receiving antenna unit 210 is increased, the efficiency of power transmission to the wireless power receiving device 200 is decreased as shown in FIG. 8A (single coil power transmission mode).
On the other hand, in a case in which the power transmission antenna unit 110 includes two transmission side resonant coils 114 and 118, and the power receiving antenna unit 210, spaced apart from the power transmission antenna unit 110 by a predetermined distance d, has an arbitrary alignment angle θ as shown in FIG. 7B, as the alignment angle θ of the power receiving antenna unit 210 is increased, the efficiency of power transmission to the wireless power receiving device 200 is decreased as shown in FIG. 8A in the in-phase power transmission mode. In the phase difference power transmission mode, however, as the alignment angle θ of the power receiving antenna unit 210 is increased, the efficiency of power transmission to the wireless power receiving device 200 is increased as shown in FIG. 8A.
Also, in a case in which the alignment angle θ of the power receiving antenna unit 210 is relatively small, the power transmission efficiency in the single coil power transmission mode may be higher than that in the in-phase power transmission mode. In a case in which the alignment angle θ of the power receiving antenna unit 210 is small, therefore, it is preferable to control the power distribution unit 150 so that the power transmission antenna unit 110 is operated in the single coil power transmission mode.
Meanwhile, in a case in which the power transmission antenna unit 110 includes two transmission side resonant coils 114 and 118, the two transmission side resonant coils 114 and 118 are preferably spaced apart from each other by a predetermined distance dc to prevent the occurrence of mutual coupling therebetween.
Meanwhile, as shown in FIG. 8B, the power transmission efficiency in the in-phase power transmission mode becomes lower than that in the 180 degrees phase difference power transmission mode at an alignment angle θ of approximately 60 degrees. For this reason, the power distribution unit 150 may be controlled so that the power transmission mode is switched from the in-phase power transmission mode to the phase difference power transmission mode at an alignment angle θ of approximately 60 degrees to somewhat compensate for reduction of the power transmission efficiency according to the alignment angle.
In the wireless power transmission device with the above-described structural elements according to the embodiment of the present invention, the power transmission antenna unit includes one or more antenna sets, and two or more power signals having different phases are transmitted to the wireless power receiving device via the power transmission antenna unit. Consequently, it is possible to somewhat compensate for reduction of the power transmission efficiency according to the alignment angle of the wireless power receiving device.
Various embodiments have been described in the best mode for carrying out the invention.
As is apparent from the above description, it is possible to transmit power using a transmission coil array including two or more transmission coils, thereby preventing lowering of power transmission efficiency depending upon the position of a receiving coil. Consequently, the present invention can be widely used in industries related to a device and system for wireless power transmission using a transmission coil array.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims (12)

  1. A wireless power transmission system comprising:
    a wireless power transmission device to transmit power in a wireless fashion; and
    a wireless power receiving device to receive the power in the wireless fashion, wherein
    the wireless power transmission device comprises a power transmission antenna unit, and the wireless power receiving device comprises a power receiving antenna unit, the power transmission antenna unit and the power receiving antenna unit magnetically resonating at the same resonant frequency to transmit the power from the wireless power transmission device to the wireless power receiving device,
    the power transmission antenna unit comprises two or more antenna sets, each of which comprises a power transmission antenna and a transmission side resonant coil, and
    the power receiving antenna unit comprises a power receiving antenna and a receiving side resonant coil.
  2. The wireless power transmission system according to claim 1, wherein the wireless power transmission device further comprises a power distribution unit to distribute power to the two or more antenna sets of the power transmission antenna unit.
  3. The wireless power transmission system according to claim 2, wherein the power distribution unit controls phases of power signals transmitted to the two or more antenna sets.
  4. The wireless power transmission system according to claim 3, wherein the respective power signals transmitted to the two or more antenna sets have the same phase or different phases.
  5. The wireless power transmission system according to claim 2, wherein the power distribution unit comprises one of a Wilkinson power divider and a hybrid coupler.
  6. A wireless power transmission device comprising:
    a direct current (DC) power converting unit to receive external alternating current (AC) power and to rectify the AC power into DC power;
    a power amplification unit to convert the DC power into a high-frequency power signal; and
    two or more antenna sets to receive the high-frequency power signal and to transmit the received high-frequency power signal to a wireless power receiving device, wherein
    each of the antenna sets comprises:
    a power transmission antenna to generate a magnetic field using the received high-frequency power signal; and
    a transmission side resonant coil to generate a non-radial electromagnetic wave using a power signal magnetically induced from the power transmission antenna and to transmit the generated non-radial electromagnetic wave to the wireless power receiving device, and
    the transmission side resonant coil magnetically resonates with a receiving side resonant coil of the wireless power receiving device at the same resonant frequency.
  7. The wireless power transmission device according to claim 6, further comprising a power distribution unit to uniformly distribute power to the two or more antenna sets.
  8. The wireless power transmission device according to claim 7, wherein the power distribution unit comprises one of a Wilkinson power divider and a hybrid coupler.
  9. The wireless power transmission device according to claim 7, wherein the power distribution unit controls phases of power signals distributed to the two or more antenna sets.
  10. The wireless power transmission device according to claim 9, wherein the power distribution unit controls the respective power signals input to the two or more antenna sets to have the same phase or different phases.
  11. The wireless power transmission device according to claim 7, wherein the power distribution unit distributes the entirety of the input power to one of the two or more antenna sets.
  12. The wireless power transmission device according to claim 6, wherein the two or more antenna sets are spaced apart from each other by a predetermined distance to avoid mutual coupling therebetween.
PCT/KR2013/002433 2012-04-02 2013-03-25 Device and system for wireless power transmission using transmission coil array WO2013151259A1 (en)

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