Wireless energy transfer converters

{
  "publication_number": "US9444520B2",
  "country": "US",
  "kind": "B2",
  "title": "Wireless energy transfer converters",
  "abstract": "Described herein are improved configurations for a wireless power converter that includes at least one receiving magnetic resonator configured to capture electrical energy received wirelessly through a first oscillating magnetic field characterized by a first plurality of parameters, and at least one transferring magnetic resonator configured to generate a second oscillating magnetic field characterized by a second plurality of parameters different from the first plurality of parameters, wherein the electrical energy from the at least one receiving magnetic resonator is used to energize the at least one transferring magnetic resonator to generate the second oscillating magnetic field.",
  "claims": [
    "1. A wireless power converter comprising: at least one receiving high-Q magnetic resonator configured to capture electrical energy received wirelessly through a first oscillating magnetic field characterized by a first plurality of parameters; and at least one transferring high-Q magnetic resonator configured to generate a second oscillating magnetic field characterized by a second plurality of parameters different from the first plurality of parameters; wherein the electrical energy from the at least one receiving magnetic resonator is used to energize the at least one transferring magnetic resonator to generate the second oscillating magnetic field; wherein the first plurality of parameters includes a first frequency parameter different from a second frequency parameter of the second plurality of parameters.",
    "2. The converter of claim 1, wherein the first frequency parameter is a first resonant frequency and the second frequency parameter is a second resonant frequency.",
    "3. The converter of claim 1, wherein the first frequency parameter is a first frequency hopping sequence and the second frequency parameter is a second frequency hopping sequence.",
    "4. The converter of claim 1, further comprising a first converter circuit configured to convert the electrical energy captured by the at least one receiving magnetic resonator into a direct current signal.",
    "5. The converter of claim 4, further comprising a second converter circuit configured to convert the direct current signal from the first converter circuit into an alternating current signal, wherein the alternating current signal is used to energize the at least one transferring magnetic resonator.",
    "6. The converter of claim 1, wherein at least one of the at least one receiving high-Q magnetic resonator and the at least one transferring high-Q magnetic resonator has a quality factor Q>100.",
    "7. The converter of claim 1, wherein the at least one receiving magnetic resonator is reconfigurable to capture energy from oscillating magnetic fields with different parameters.",
    "8. The converter of claim 1, wherein the at least one transferring magnetic resonator is reconfigurable to generate oscillating magnetic fields with different parameters.",
    "9. The converter of claim 1, wherein the at least one receiving magnetic resonator and the at least one transferring resonator share a loop inductor.",
    "10. A system comprising: a source configured to generate a first oscillating magnetic field characterized by a first plurality of parameters; a device resonator configured to capture electrical energy received wirelessly through a second oscillating magnetic field characterized by a second plurality of parameters different from the first plurality of parameters, and a wireless power converter including conversion circuitry configured to capture energy from the second oscillating magnetic field and to energize the source resonator to generate the first oscillating magnetic field; wherein the first plurality of parameters and the e second plurality of parameters are different in at least a frequency.",
    "11. The system of claim 10, wherein the wireless power converter is powered by electrical energy captured by the device resonator.",
    "12. The system of claim 10, wherein at least one of the source resonator and the device resonator has a quality factor Q>100.",
    "13. The system of claim 10, wherein the source resonator and the device resonator include a shared loop inductor.",
    "14. A method of wireless power conversion comprising: providing a configurable magnetic resonator; tuning the configurable magnetic resonator to capture a first oscillating magnetic field characterized by a first plurality of parameters; converting the oscillating magnetic field into electrical energy; storing the electrical energy as stored energy in an energy storage element; tuning the configurable magnetic resonator to generate a second oscillating magnetic field characterized by a second plurality of parameters; and energizing the configurable magnetic resonator using the stored energy to produce the second oscillating magnetic field; wherein the first plurality of parameters include a first frequency different from a second frequency of the second plurality of parameters.",
    "15. The method of claim 14, wherein the configurable magnetic resonator has a quality factor Q>100.",
    "16. The method of claim 14, further comprising converting the electrical energy into a direct current signal prior to storing the electrical energy in the energy storage element."
  ],
  "description_excerpt": "1. Field\n\nThis disclosure relates to wireless energy transfer, also referred to as wireless power transmission.\n\n2. Description of the Related Art\n\nEnergy or power may be transferred wirelessly using a variety of known radiative, or far-field, and non-radiative, or near-field, techniques. For example, radiative wireless information transfer using low-directionality antennas, such as those used in radio and cellular communications systems and home computer networks, may be considered wireless energy transfer. However, this type of radiative transfer is very inefficient because only a tiny portion of the supplied or radiated power, namely, that portion in the direction of, and overlapping with, the receiver is picked up. The vast majority of the power is radiated away in all the other directions and lost in free space. Such inefficient power transfer may be acceptable for data transmission, but is not practical for transferring useful amounts of electrical energy for the purpose of doing work, such as for powering or charging electrical devices. One way to improve the transfer efficiency of some radiative energy transfer schemes is to use directional antennas to confine and preferentially direct the radiated energy towards a receiver. However, these directed radiation schemes may require an uninterruptible line-of-sight and potentially complicated tracking and steering mechanisms in the case of mobile transmitters and/or receivers. In addition, such schemes may pose hazards to objects or people that cross or intersect the beam when modest to high amounts of power are being transmitted.",
  "cpc": [
    "H01Q 7/00",
    "B60L 11/182",
    "B60L 11/184",
    "B60L 11/1842",
    "B60L 11/1844",
    "B60L 11/1846",
    "B60L 11/1848",
    "B60L 2200/12",
    "B60L 2200/22",
    "B60L 2200/26",
    "B60L 2210/10",
    "B60L 2210/20",
    "B60L 2210/30",
    "B60L 2210/40",
    "B60L 2230/22",
    "B60L 2230/24",
    "B60L 2250/10",
    "B60L 2250/16",
    "B60L 2260/28",
    "B60L 53/122",
    "B60L 53/124",
    "B60L 53/126",
    "B60L 53/51",
    "B60L 53/52",
    "B60L 53/63",
    "B60L 53/64",
    "B60L 53/65",
    "B60L 53/665",
    "B60L 55/00",
    "H01F 38/14",
    "H02J 2101/28",
    "H02J 50/12",
    "H02J 50/50",
    "H02J 50/60",
    "H02J 50/70",
    "H02J 50/80",
    "H02J 50/90",
    "H02J 7/34",
    "H02J 7/35",
    "H02J 7/42",
    "H03H 7/40",
    "H04B 5/0037",
    "H04B 5/24",
    "H04B 5/79",
    "Y02E 60/00",
    "Y02E 60/721",
    "Y02T 10/70",
    "Y02T 10/7005",
    "Y02T 10/7072",
    "Y02T 10/7088",
    "Y02T 10/72",
    "Y02T 10/7216",
    "Y02T 10/7241",
    "Y02T 10/725",
    "Y02T 90/12",
    "Y02T 90/121",
    "Y02T 90/122",
    "Y02T 90/127",
    "Y02T 90/128",
    "Y02T 90/14",
    "Y02T 90/16",
    "Y02T 90/163",
    "Y02T 90/167",
    "Y02T 90/169",
    "Y04S 10/126",
    "Y04S 30/14"
  ],
  "ipc": [
    "H02J 4/25",
    "H04B 5/00",
    "B60L 11/18",
    "H01Q 7/00",
    "H03H 7/40"
  ],
  "assignees": [
    "WiTricity Corp"
  ],
  "inventors": [
    "Katherine L. Hall",
    "Morris P. Kesler",
    "Konrad J. Kulikowski",
    "Andrew J. Campanella"
  ],
  "filing_date": "2013-07-19",
  "publication_date": "2016-09-13",
  "grant_date": "2016-09-13",
  "priority_date": "2008-09-27",
  "application_number": "US-201313946056-A",
  "family_id": "42980465",
  "cited_by_count": 21,
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