System for transferring energy by electromagnetic coupling

{
  "publication_number": "US9768645B2",
  "country": "US",
  "kind": "B2",
  "title": "System for transferring energy by electromagnetic coupling",
  "abstract": "The invention relates to a device (1) for emitting energy by electromagnetic coupling which comprises: a single generator (5) outputting an AC electric signal between two terminals; a series of resonant modules (2 i) each including a capacitor and a first inductance, and first to fourth terminals (Ai, Bi, Ci, Di), the first (Ai) and second (Bi) terminals of a first module being connected to terminals of the generator, and the first (Ai) and second (Bi) terminals of the other module or modules being connected to the third (Ci) and fourth (Di) terminals of the module of the previous row.",
  "claims": [
    "1. A system of power supply by electromagnetic coupling comprising: a device for power transmission by electromagnetic coupling, comprising a single generator delivering an A.C. electric signal between two terminals; and a succession of resonant modules, each comprising a first capacitor and a first inductance, and first, second, third, and fourth terminals, the first and second terminals of a first module being connected across the generator, and the first and second terminals of the other module(s) being connected to the third and fourth terminals of the module of previous rank; and at least two receivers each comprising a resonant circuit comprising at least one capacitor and at least one inductance, wherein the at least two receivers are separate and non-coupled.",
    "2. The system of claim 1, wherein, in the transmission device, two consecutive resonant modules are interconnected by a two-wire connection.",
    "3. The system of claim 2, wherein, in the transmission device, said two-wire connection comprises a pair of adjoined wires.",
    "4. The system of claim 2, wherein, in the transmission device, said connection comprises a twisted pair of wires.",
    "5. The system of claim 1, wherein, in the transmission device, in each module, the first capacitor and the first inductance are series-connected between the first and third terminals, the second and fourth terminals being interconnected.",
    "6. The system of claim 1, wherein, in the transmission device, in each module, the first capacitor and the first inductance are connected in parallel between the first and second terminals, the first and third terminals being interconnected, and the second and fourth terminals being interconnected.",
    "7. The system of claim 1, wherein, in the transmission device, the successive modules are connected so that, in each module, the current flow direction in the inductance is different from the current flow direction in the inductance of the module of previous rank.",
    "8. The system of claim 1, wherein, in each receiver, said resonant circuit is capable of providing electric power to a load, in the presence of an electromagnetic field emitted by the transmission device.",
    "9. The system of claim 1, further comprising means for maintaining a predefined relative position between each receiver and the power transmission device, this position being selected according to the optimal coupling desired between the resonant circuit of the receiver and a resonant module of the power transmission device.",
    "10. The system of claim 9, wherein said means comprise a wall in the shape of a hollow cylinder.",
    "11. The system of claim 10, wherein said wall supports conductive windings forming the inductances of the resonant modules.",
    "12. The system of claim 1, capable of recharging, by electromagnetic coupling, luminous ornaments.",
    "13. The system of claim 1, wherein said power transmission device further comprises means for: measuring the current or the output voltage of said generator; deducing therefrom the number of receivers coupled to said device; and accordingly adjusting the output characteristics of said generator, to maintain a constant power transfer towards the receivers, independently from the number of receivers.",
    "14. A use of the device of claim 1, for simultaneously electrically powering at least two loads."
  ],
  "description_excerpt": "Field of the Invention\n\nThe present disclosure relates to wireless power transfer by electromagnetic coupling. It more specifically relates to a transmission device capable of simultaneously electrically powering a plurality of electronic devices.\n\nDescription of the Related Art\n\nSystems where an electromagnetic field provided by a transmission device (transmitter) is used to electrically power an electronic device (receiver) are known. The receiver for example is a lamp, a wireless phone, an electric toothbrush, an electronic tag, a medical implant, or any other device capable of being remotely supplied. The transmitter comprises an A.C. signal generator connected to a conductive winding forming an antenna, and electronic components such as capacitors or resistors performing frequency tuning and impedance matching functions. The receiver comprises a conductive winding forming an antenna and components performing frequency tuning, impedance matching, and rectification functions. To optimize the power transfer, the antenna circuits of the transmitter and of the receiver should be sized according to the receiver. The main parameters are the number of turns of the conductive windings forming the transmit and receive antennas, the dimensions of the antennas, and the distance between the transmit antenna and the receive antenna.\n\nAs an example, in a conventional representation, the transmitter is modeled as a series resonant circuit R E L E C E connected to an A.C. signal generator, and the receiver is modeled as a parallel resonant circuit R R L R C R.",
  "cpc": [
    "H02J 7/50",
    "H02J 17/00",
    "H02J 5/005",
    "H02J 50/12",
    "H02J 50/402",
    "H02J 50/90",
    "H02J 7/0027",
    "H02J 7/025",
    "Y10T 307/406"
  ],
  "ipc": [
    "H02J 17/00",
    "H02J 5/00",
    "H02J 7/00",
    "H02J 7/02"
  ],
  "assignees": [
    "Commissariat a lEnergie Atomique et aux Energies Alternatives CEA"
  ],
  "inventors": [
    "Yann Tetu",
    "Sylvain Bacquet",
    "Thierry Thomas"
  ],
  "filing_date": "2012-10-03",
  "publication_date": "2017-09-19",
  "grant_date": "2017-09-19",
  "priority_date": "2011-10-03",
  "application_number": "US-201214349279-A",
  "family_id": "47089058",
  "cited_by_count": 13,
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}