Wireless Electricity Transfer

Just saw this on a blogspot post and had to pop it on here. It reminds me of ‘The Prestige’ which is saw quite recently for the first time.

Give it a look over… Its like real magic.

The Tesla effect is the wireless energy transfer to wireless powered electronic devices (which Tesla demonstrated on a low scale with incandescent light bulbs as early as 1893 and aspired to use for the intercontinental transmission of industrial power levels in his unfinished Wardenclyffe Tower project).

Seven Witricity Corporation (80 Coolidge Hill Road Watertown, MA) inventors in U.S. Patent Application 20100201203 reveal a system for the wireless transfer of electricity using high-Q resonators. They imagine many applications where the systems could provide wireless power across mid-range distances, including consumer electronics, industrial applications, infrastructure power and lighting, transportation vehicles, electronic games, military applications, and the like.

The systems and methods provide for near-field wireless energy transfer via strongly coupled high-Q resonators, a technique with the potential to transfer power levels from picowatts to kilowatts, safely, and over distances much larger than have been achieved using traditional induction techniques.

The devices and systems were developed by nventors David A Schatz (Needham, MA), Herbert T. Lou (Carlisle, MA), Morris P. Kesler (Bedford, MA), Katherine L. Hall (Westford, MA), Konrad J. Kulikowski (Somerville, MA), Eric R. Giler (Wellesley, MA) and Ron Fiorello (Tewksbury, MA)

According to the application, the inventors developed improved configurations for a wireless lighting power transfer method including providing a source having a source resonator that includes a high-Q source magnetic resonator coupled to a power source, providing a device having a device resonator that includes a high-Q device magnetic resonator, distal from the source resonator, the device including a light emitting part electrically coupled to the device resonator, providing a signaling capability between the source and the device, signaling a state of the device to the source using the signaling capability, and energizing the source to generate an oscillating magnetic field according to the state of the device.

The omni-directional but stationary (non-lossy) nature of the near-fields of the resonators we disclose enables efficient wireless energy transfer over mid-range distances, over a wide range of directions and resonator orientations, suitable for charging, powering, or simultaneously powering and charging a variety of electronic devices.

As a result, a system may have a wide variety of possible applications where a first resonator, connected to a power source, is in one location, and a second resonator, potentially connected to electrical/electronic devices, batteries, powering or charging circuits, and the like, is at a second location, and where the distance from the first resonator to the second resonator is on the order of centimeters to meters.

For example, a first resonator connected to the wired electricity grid could be placed on the ceiling of a room, while other resonators connected to devices, such as robots, vehicles, computers, communication devices, medical devices, and the like, move about within the room, and where these devices are constantly or intermittently receiving power wirelessly from the source resonator.

Energy exchange between two electromagnetic resonators can be optimized when the resonators are tuned to substantially the same frequency and when the losses in the system are minimal. Wireless energy transfer systems may be designed so that the “coupling-time” between resonators is much shorter than the resonators’ “loss-times”.

Therefore, the systems may utilize high quality factor (high-Q) resonators with low intrinsic-loss rates. In addition, the systems and methods described herein may use sub-wavelength resonators with near-fields that extend significantly longer than the characteristic sizes of the resonators, so that the near-fields of the resonators that exchange energy overlap at mid-range distances. This is a regime of operation that has not been practiced before and that differs significantly from traditional induction designs.

It is important to appreciate the difference between the high-Q magnetic resonator scheme disclosed here and the known close-range or proximity inductive schemes, namely, that those known schemes do not conventionally utilize high-Q resonators. Using coupled-mode theory (CMT), (see, for example, Waves and Fields in Optoelectronics, H. A. Haus, Prentice Hall, 1984), one may show that a high-Q resonator-coupling mechanism can enable orders of magnitude more efficient power delivery between resonators spaced by mid-range distances than is enabled by traditional inductive schemes. Coupled high-Q resonators have demonstrated efficient energy transfer over mid-range distances and improved efficiencies and offset tolerances in short range energy transfer applications.

Efficient energy transfer may be realized for a variety of general systems of strongly coupled resonators, such as systems of strongly coupled acoustic resonators, nuclear resonators, mechanical resonators, and the like, as originally described by researchers at M.I.T. in their publications, “Efficient wireless non-radiative mid-range energy transfer”, Annals of Physics, vol. 323, Issue 1, p. 34 (2008) and “Wireless Power Transfer via Strongly Coupled Magnetic Resonances”, Science, vol. 317, no. 5834, p. 83, (2007).

Disclosed are electromagnetic resonators and systems of coupled electromagnetic resonators, also referred to more specifically as coupled magnetic resonators and coupled electric resonators, with operating frequencies below 10 GHz.

FIGS. 1(a) and (b) depict exemplary wireless power systems containing a source resonator 1 and device resonator 2 separated by a distance D.

FIG. 1(a) shows an example of two coupled resonators 1000, a first resonator 102S, configured as a source resonator and a second resonator 102D, configured as a device resonator. Energy may be transferred over a distance D between the resonators. The source resonator 102S may be driven by a power supply or generator (not shown). Work may be extracted from the device resonator 102D by a power consuming drain or load (e.g. a load resistor, not shown).

The systems can provide wireless powering or charging capabilities to mobile vehicles such as golf carts or other types of carts, all-terrain vehicles, electric bikes, scooters, cars, mowers, bobcats and other vehicles typically used for construction and landscaping and the like. The methods can provide wireless powering or charging capabilities to miniature mobile vehicles, such as mini-helicopters, airborne drones, remote control planes, remote control boats, remote controlled or robotic rovers, remote controlled or robotic lawn mowers or equipment, bomb detection robots, and the like. For instance, mini-helicopter flying above a military vehicle to increase its field of view can fly for a few minutes on standard batteries. If these mini-helicopters were fitted with a device resonator, and the control vehicle had a source resonator, the mini-helicopter might be able to fly indefinitely.

The methods may provide an effective alternative to recharging or replacing the batteries for use in miniature mobile vehicles. In addition, the systems and methods described herein may provide power/charging to even smaller devices, such as microelectromechanical systems (MEMS), nano-robots, nano devices, and the like. In addition, the systems and methods described herein may be implemented by installing a source device in a mobile vehicle or flying device to enable it to serve as an in-field or in-flight re-charger, that may position itself autonomously in proximity to a mobile vehicle that is equipped with a device resonator.

The systems may be used to provide power networks for temporary facilities, such as military camps, oil drilling setups, remote filming locations, and the like, where electrical power is required, such as for power generators, and where power cables are typically run around the temporary facility. There are many instances when it is necessary to set up temporary facilities that require power. The systems and methods described herein may enable a more efficient way to rapidly set up and tear down these facilities, and may reduce the number of wires that must be run throughout the faculties to supply power. For instance, when Special Forces move into an area, they may erect tents and drag many wires around the camp to provide the required electricity.

Instead, the systems and methods may enable an army vehicle, outfitted with a power supply and a source resonator, to park in the center of the camp, and provide all the power to nearby tents where the device resonator may be integrated into the tents, or some other piece of equipment associated with each tent or area. A series of source-device-source-device resonators may be used to extend the power to tents that are farther away. That is, the tents closest to the vehicle could then provide power to tents behind them. The systems and methods may provide a significant improvement to the efficiency with which temporary installations may be set up and torn down, thus improving the mobility of the associated facility.

The systems may be used in vehicles, such as for replacing wires, installing new equipment, powering devices brought into the vehicle, charging the battery of a vehicle (e.g. for a traditional gas powered engine, for a hybrid car, for an electric car, and the like), powering devices mounted to the interior or exterior of the vehicle, powering devices in the vicinity of the vehicle, and the like. For example, the methods may be used to replace wires such as those are used to power lights, fans and sensors distributed throughout a vehicle. As an example, a typical car may have 50 kg of wires associated with it, and the use of the systems and methods described herein may enable the elimination of a substantial amount of this wiring.

The performance of larger and more weight sensitive vehicles such as airplanes or satellites could benefit greatly from having the number of cables that must be run throughout the vehicle reduced. The high-Q systems may allow the accommodation of removable or supplemental portions of a vehicle with electric and electrical devices without the need for electrical harnessing. For example, a motorcycle may have removable side boxes that act as a temporary trunk space for when the cyclist is going on a long trip. These side boxes may have exterior lights, interior lights, sensors, auto equipment, and the like, and if not for being equipped with the systems and methods described herein might require electrical connections and harnessing.

An in-vehicle wireless power transmission system may charge or power one or more mobile devices used in a car: mobile phone handset, Bluetooth headset, blue tooth hands free speaker phone, GPS, MP3 player, wireless audio transceiver for streaming MP3 audio through car stereo via FM, Bluetooth, and the like. The in vehicle wireless power source may utilize source resonators that are arranged in any of several possible configurations including charging pad on dash, charging pad otherwise mounted on floor, or between seat and center console, charging “cup” or receptacle that fits in cup holder or on dash, and the like.

The wireless power transmission source may utilize a rechargeable battery system such that said supply battery gets charged whenever the vehicle power is on such that when the vehicle is turned off the wireless supply can draw power from the supply battery and can continue to wirelessly charge or power mobile devices that are still in the car.

Credit to this place http://nanopatentsandinnovations.blogspot.com/2010/09/teslas-dream-come-true-wireless.html


4 responses to “Wireless Electricity Transfer

  1. Hi. This is Aashish pandya. I am student of mechanical engg. student of PACIFIC UNIVERSITY. I like your this consept. i want to do one project which parts, programme, theory and working etc. content a MECHANICAL ENGG., ELECTRICAL ENGG. AUTOMOBILE ENGG. ELECTRONIC & COMUNITION ENGG etc. So., Can u help me sir?

    • Hey there Aashish thanks for the comment but i am not likely to be any help. I am not an engineer and your knowledge of engineering would probably easily surpass my own. Sorry, Thanks for reading though.

  2. Nice Blog. I have been researching cell phone, and wireless electricity for my Environmental Science blog. I have a couple questions I hoped you could answer.
    First, Wireless electricity may not have recognizable frequency, but what are there long term risks of using Wireless Electrcity?
    Next, would more items using Wireless Electricity lower the power of it? Lastly, when will these changes be phased in?

    • Hey cheers for reading. Right gonna give you short answers.
      1) I don’t know.
      2) Probably i guess.
      3) Not a clue

      This idea and implementation of ideas is not my own and therefore i don’t know too much about it. I thought the whole idea of wireless electricity pretty cool. But other than that my knowledge of this is very limited.

      Sorry i am not much help. I believe i left a link to the original article i found the majority of informationfrom and hopefully you may find your answers there.

      Thanks anyway.

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