WO2007008646A2 - Wireless non-radiative energy transfer - Google Patents

Wireless non-radiative energy transfer Download PDF

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Publication number
WO2007008646A2
WO2007008646A2 PCT/US2006/026480 US2006026480W WO2007008646A2 WO 2007008646 A2 WO2007008646 A2 WO 2007008646A2 US 2006026480 W US2006026480 W US 2006026480W WO 2007008646 A2 WO2007008646 A2 WO 2007008646A2
Authority
WO
WIPO (PCT)
Prior art keywords
resonator structure
energy transfer
sphere
transfer device
characteristic size
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/US2006/026480
Other languages
English (en)
French (fr)
Other versions
WO2007008646A3 (en
Inventor
John D. Joannopoulos
Arsteidis Karalis
Marin Solajacic
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Massachusetts Institute of Technology
Original Assignee
Massachusetts Institute of Technology
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.)
Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=37637764&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2007008646(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority to KR1020087003376A priority Critical patent/KR101156616B1/ko
Priority to EP11150602.8A priority patent/EP2306615B1/en
Priority to CN2006800322992A priority patent/CN101258658B/zh
Priority to JP2008521453A priority patent/JP4921466B2/ja
Priority to CA2615123A priority patent/CA2615123C/en
Priority to KR1020117023735A priority patent/KR101118710B1/ko
Priority to EP11150603.6A priority patent/EP2306616B2/en
Priority to EP06786588.1A priority patent/EP1902505B1/en
Priority to AU2006269374A priority patent/AU2006269374C1/en
Application filed by Massachusetts Institute of Technology filed Critical Massachusetts Institute of Technology
Priority to EP21192075.6A priority patent/EP3979481A1/en
Priority to KR1020117013029A priority patent/KR101136889B1/ko
Publication of WO2007008646A2 publication Critical patent/WO2007008646A2/en
Anticipated expiration legal-status Critical
Publication of WO2007008646A3 publication Critical patent/WO2007008646A3/en
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/12—Inductive energy transfer
    • B60L53/126—Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14—Inductive couplings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant 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
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0064—Magnetic structures combining different functions, e.g. storage, filtering or transformation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/01—Resonant DC/DC converters
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Definitions

  • the invention relates to the field of oscillatory resonant electromagnetic modes, and in particular to oscillatory resonant electromagnetic modes, with localized slowly evanescent field patterns, for wireless non-radiative energy transfer.
  • an electromagnetic energy transfer device includes a first resonator structure receiving energy from an external power supply.
  • the first resonator structure has a first Q-factor.
  • a second resonator structure is positioned distal from the first resonator structure, and supplies useful working power to an external load.
  • the second resonator structure has a second Q-factor.
  • the distance between the two resonators can be larger than the characteristic size of each resonator.
  • Non-radiative energy transfer between the first resonator structure and the second resonator structure is mediated through coupling of their resonant-field evanescent tails.
  • a method of transferring electromagnetic energy includes providing a first resonator structure receiving energy from an external power supply.
  • the first resonator structure has a first Q-factor.
  • the method includes a second resonator structure being positioned distal from the first resonator structure, and supplying useful working power to an external load.
  • the second resonator structure has a second Q-factor.
  • the distance between the two resonators can be larger than the characteristic size of each resonator.
  • the method includes transferring non-radiative energy between the first resonator structure and the second resonator structure through coupling of their resonant- field evanescent tails.
  • FIG. 1 is a schematic diagram illustrating an exemplary embodiment of the invention
  • FIG. 2A is a numerical FDTD result for a high-index disk cavity of radius r along with the electric field
  • FIG. 2B a numerical FDTD result for a medium-distance coupling between two resonant disk cavities: initially, all the energy is in one cavity (left panel); after some time both cavities are equally excited (right panel).
  • FIG. 3 is schematic diagram demonstrating two capacitively-loaded conducting- wire loops
  • FIGs. 4A-4B are numerical FDTD results for reduction in radiation- ⁇ of the resonant disk cavity due to scattering from extraneous objects
  • FIG. 5 is a numerical FDTD result for medium-distance coupling between two resonant disk cavities in the presence of extraneous objects
  • FIGs. 6A-6B are graphs demonstrating efficiencies of converting the supplied power into useful work ( ⁇ w ), radiation and ohmic loss at the device (tjd), and the source
  • F w is chosen so as to minimize the energy stored in the device, while in panel (b) F w is chosen so as to maximize the efficiency ⁇ w for each ⁇ /F d .
  • the invention provides the feasibility of using long-lived oscillatory resonant electromagnetic modes, with localized slowly evanescent field patterns, for wireless non-radiative energy transfer.
  • the basis of this technique is that two same-frequency resonant objects tend to couple, while interacting weakly with other off-resonant environmental objects.
  • the purpose of the invention is to quantify this mechanism using specific examples, namely quantitatively address the following questions: up to which distances can such a scheme be efficient and how sensitive is it to external perturbations.
  • Detailed theoretical and numerical analysis show that a mid-range (L TR AN S ⁇ few*L DE v) wireless energy-exchange can actually be achieved, while suffering only modest transfer and dissipation of energy into other off-resonant objects.
  • FIG. 1 is a schematic diagram illustrating a general description of the invention.
  • the invention uses a source and device to perform energy transferring.
  • Both the source 1 and device 2 are resonator structures, and are separated a distance D from each other.
  • the electromagnetic field of the system of source 1 and device 2 is approximated by F(r,t) ⁇ ai(t) ⁇ Fi(r)+a.2(t) ⁇ 2(r), where ⁇ Lirfr)] are the eigenmodes of source 1 and device 2 alone, and then the field amplitudes arft) and ⁇ 2(t) can be shown to satisfy the "coupled-mode theory": da * . / ._, x
  • ⁇ w li2 are the individual eigen-frequencies
  • /1, 2 are the resonance widths due to the objects' intrinsic (absorption, radiation etc.) losses
  • 7c 12 , 2 i are the coupling coefficients
  • ⁇ i22 model the shift in the complex frequency of each object due to the presence of the other.
  • Objects of nearly infinite extent can support guided modes whose evanescent tails are decaying exponentially in the direction away from the object, slowly if tuned close to cutoff, and can have nearly infinite Q.
  • inventive energy-transfer scheme such geometries might be suitable for certain applications, but usually finite objects, namely ones that are topologically surrounded everywhere by air, are more appropriate.
  • the invention is very general and any type of resonant structure satisfying the above requirements can be used for its implementation.
  • dielectric disks and capacitively-loaded conducting-wire loops.
  • dielectric disks Even without optimization, and despite their simplicity, both will be shown to exhibit fairly good performance. Their difference lies mostly in the frequency range of applicability due to practical considerations, for example, in the optical regime dielectrics prevail, since conductive materials are highly lossy.
  • the radial modal decay length which determines the coupling strength is on the order of the wavelength, therefore, for near-field coupling to take place between cavities whose distance is much larger than their size, one needs subwavelength-sized resonant objects (r« ⁇ ).
  • r subwavelength-sized resonant objects
  • High-radiation-g and long-tailed subwavelength resonances can be achieved, when the dielectric permittivity ⁇ is as large as practically possible and the azimuthal field variations (of principal number m) are slow (namely m is small).
  • the effect of the extraneous object is just a perturbation on the resonance of the resonant object and it is twofold: First, it shifts its resonant frequency through the real part of Ku thus detuning it from other resonant objects. This is a problem that can be fixed rather easily by applying a feedback mechanism to every device that corrects its frequency, such as through small changes in geometry, and matches it to that of the source. Second, it forces the resonant object to lose modal energy due to scattering into radiation from the extraneous object through the induced polarization or currents in it, and due to material absorption in the extraneous object through the imaginary part of Kn. This reduction in Q can be a detrimental effect to the functionality of the energy-transfer scheme, because it cannot be remedied, so its magnitude must be quantified.
  • the class of dielectric disks, small, low-index, low-material-loss or far-away stray objects will induce small scattering and absorption.
  • the coupling time for energy exchange with the device is much shorter than the time needed for the losses inside the extraneous object to accumulate, especially if the amplitude of the resonant field has an exponential-like decay away from the source.
  • the efficiencies ⁇ for the two different choices are shown in FIGs. 6A and 6B respectively, as a function of the ⁇ /F d figure-of-merit which in turn depends on the source-device distance.
  • FIGs. 6A-6B show that for the system of dielectric disks and the choice of optimized efficiency, the efficiency can be large, e.g., at least 40%.
  • the dissipation of energy inside the human is small enough, less than 5%, for values ⁇ /Fd>l and Q fl >10 5 , namely for medium-range source-device distances (D/r ⁇ 10) and most human- source/device distances (D ⁇ /r>8).
  • the invention provides a resonance-based scheme for mid-range wireless non- radiative energy transfer. Analyses of very simple implementation geometries provide encouraging performance characteristics for the potential applicability of the proposed mechanism. For example, in the macroscopic world, this scheme could be used to deliver power to robots and/or computers in a factory room, or electric buses on a highway (source-cavity would in this case be a "pipe" running above the highway).
  • the resonant object can be significantly smaller than the exponential-like tails of its field.
  • acoustic resonances for applications in which source and device are connected via a common condensed-matter object.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Signal Processing (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Aerials With Secondary Devices (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)
  • Near-Field Transmission Systems (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
PCT/US2006/026480 2005-07-12 2006-07-05 Wireless non-radiative energy transfer Ceased WO2007008646A2 (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
KR1020117013029A KR101136889B1 (ko) 2005-07-12 2006-07-05 무선 비-방사성 에너지 전달
EP11150603.6A EP2306616B2 (en) 2005-07-12 2006-07-05 Wireless non-radiative energy transfer
CN2006800322992A CN101258658B (zh) 2005-07-12 2006-07-05 无线非辐射能量传递
JP2008521453A JP4921466B2 (ja) 2005-07-12 2006-07-05 無線非放射型エネルギー転送
CA2615123A CA2615123C (en) 2005-07-12 2006-07-05 Wireless non-radiative energy transfer
KR1020117023735A KR101118710B1 (ko) 2005-07-12 2006-07-05 무선 비-방사성 에너지 전달
EP06786588.1A EP1902505B1 (en) 2005-07-12 2006-07-05 Wireless non-radiative energy transfer
KR1020087003376A KR101156616B1 (ko) 2005-07-12 2006-07-05 무선 비-방사성 에너지 전달
AU2006269374A AU2006269374C1 (en) 2005-07-12 2006-07-05 Wireless non-radiative energy transfer
EP11150602.8A EP2306615B1 (en) 2005-07-12 2006-07-05 Wireless non-radiative energy transfer
EP21192075.6A EP3979481A1 (en) 2005-07-12 2006-07-05 Wireless non-radiative energy transfer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US69844205P 2005-07-12 2005-07-12
US60/698,442 2005-07-12

Publications (2)

Publication Number Publication Date
WO2007008646A2 true WO2007008646A2 (en) 2007-01-18
WO2007008646A3 WO2007008646A3 (en) 2008-02-28

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PCT/US2006/026480 Ceased WO2007008646A2 (en) 2005-07-12 2006-07-05 Wireless non-radiative energy transfer

Country Status (8)

Country Link
US (29) US7741734B2 (enExample)
EP (4) EP2306615B1 (enExample)
JP (2) JP4921466B2 (enExample)
KR (3) KR101118710B1 (enExample)
CN (4) CN102255398B (enExample)
AU (2) AU2006269374C1 (enExample)
CA (1) CA2615123C (enExample)
WO (1) WO2007008646A2 (enExample)

Cited By (310)

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WO2009009559A1 (en) 2007-07-09 2009-01-15 Nigelpower, Llc Wireless energy transfer using coupled antennas
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JP2009136132A (ja) * 2007-11-30 2009-06-18 Chun-Kil Jung 近距離の無線電力伝送システム
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WO2010041318A1 (ja) 2008-10-09 2010-04-15 トヨタ自動車株式会社 非接触受電装置およびそれを備える車両
WO2010052975A1 (ja) 2008-11-04 2010-05-14 株式会社 豊田自動織機 非接触電力伝送装置及びその設計方法
JP2010124522A (ja) * 2008-11-17 2010-06-03 Toyota Central R&D Labs Inc 給電システム
JP2010130878A (ja) * 2008-12-01 2010-06-10 Toyota Industries Corp 非接触電力伝送装置
JP2010520716A (ja) * 2007-03-02 2010-06-10 クゥアルコム・インコーポレイテッド 無線電力装置及び方法
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JP2010148273A (ja) * 2007-12-14 2010-07-01 Darfon Electronics Corp エネルギー転送システム及びエネルギー転送方法
JP2010154592A (ja) * 2008-12-24 2010-07-08 Hitachi Ltd 非接触電力伝送システム
EP2216878A2 (en) 2009-02-09 2010-08-11 Kabushiki Kaisha Toyota Jidoshokki Non-contact power transmission apparatus
EP2216870A2 (en) 2009-02-09 2010-08-11 Kabushiki Kaisha Toyota Jidoshokki Non-contact power transmission apparatus
WO2010090323A1 (ja) 2009-02-09 2010-08-12 株式会社 豊田自動織機 非接触電力伝送装置
WO2010095281A1 (ja) 2009-02-17 2010-08-26 株式会社日本自動車部品総合研究所 非接触給電設備および非接触給電システム
WO2010106948A1 (ja) * 2009-03-17 2010-09-23 ソニー株式会社 電力伝送システムおよび電力出力装置
WO2010106648A1 (ja) 2009-03-18 2010-09-23 トヨタ自動車株式会社 非接触受電装置、非接触送電装置、非接触給電システムおよび車両
DE102009013034A1 (de) 2009-03-16 2010-10-07 Olympus Winter & Ibe Gmbh Autoklavierbare Aufladevorrichtung für einen Energiespeicher eines chirurgischen Instruments sowie Verfahren zum Aufladen eines wiederaufladbaren Energiespeichers in einem autoklavierten chirurgischen Instrument oder für ein autoklaviertes chirurgisches Instrument
WO2010119577A1 (ja) 2009-04-13 2010-10-21 株式会社日本自動車部品総合研究所 非接触給電設備、非接触受電装置および非接触給電システム
JP2010536315A (ja) * 2007-08-09 2010-11-25 クゥアルコム・インコーポレイテッド 共振器のｑファクタを増大させること
JP2010537496A (ja) * 2007-08-13 2010-12-02 クゥアルコム・インコーポレイテッド 長距離低周波数共振器および素材
WO2011001524A1 (ja) 2009-07-02 2011-01-06 トヨタ自動車株式会社 コイルユニット、非接触受電装置、非接触送電装置、非接触給電システムおよび車両
EP2320538A2 (en) 2009-11-09 2011-05-11 Kabushiki Kaisha Toyota Jidoshokki Resonance type non-contact charging apparatus
WO2011064879A1 (ja) * 2009-11-27 2011-06-03 富士通株式会社 送電装置および電力伝送装置
WO2011099071A1 (ja) * 2010-02-10 2011-08-18 富士通株式会社 磁界共鳴型電力伝送システムにおける共振周波数制御方法、送電装置、および受電装置
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