MIT Engineers Unveil Wireless Power System
Chris Peredun & Kristopher Kubicki
June 11, 2007 10:41 AM
comment(s) - last by
The team consists of (top to bottom, left to right) Andre Kurs, Prof. John Joannopoulos, Aristeidis Karalis, Prof. Marin Soljacic, Prof. Peter Fisher, and Robert Moffatt. (Source: MIT, Aristeidis Karalis)
A 60-watt bulb illuminates for the future of wireless power
"Wireless" isn't exactly a new concept to computing. Network connectivity, USB devices and even displays had their cords cut in recent years. Researchers from the Massachusetts Institute of Technology took the final steps towards cutting the last tether of the laptop user: the power cord.
Transmitting power wirelessly is traditionally limited to line-of-sight methods such as microwave or laser, which have a "significant negative effect" on anyone or anything unfortunate enough to be caught in the middle.
Playfully dubbed "WiTricity" by the team, the researchers were able to power a sixty-watt lightbulb from seven feet away using the principle of
magnetically coupled resonance
. The basic concept is similar to existing electromagnetic inductive chargers, but does not suffer the massive drop in efficiency when distance is increased.
The experiment works as follows. Two magnetic coils resonate at the same frequency. When one of these coils is attached to a power source, the resonant magnetic field produced by the coil increases dramatically. The second, unpowered coil "couples" with the resonating magnetic field. The resonance from the second coil is then converted back to electricity for the device.
The MIT researches are quick to tout magnetically coupled resonance over electromagnetic induction. Aristeidis Karalis, an MIT graduate student that worked on the project, states, "Here is where the magic of the resonant coupling comes about. The usual non-resonant magnetic induction would be almost 1 million times less efficient in this particular system."
In addition to increased efficiency, the WiTricity project does not transmit biologically harmful electromagnetic radiation during operation. Additionally, line-of-sight issues present in microwave technology disappear with WiTricity; magnetic fields are more-or-less unaffected by non-metallic materials in most environments.
The most current WiTricity experiments use coils approximately 20" in diameter and operate at distances of approximately two meters. The team hopes to eventually power a notebook from a several meters away.
This article is over a month old, voting and posting comments is disabled
6/11/2007 1:19:17 PM
Could be worse than WiTricity
It could be iPower
"There's no chance that the iPhone is going to get any significant market share. No chance." -- Microsoft CEO Steve Ballmer
U.S. Air Force F-35 Lightning II, F-22 Raptor Team Up for “Integration Training”
November 19, 2014, 9:15 AM
U.S. Marshals Using Fake, Airplane-based Cell Towers to Scan Cell Phones of Americans
November 14, 2014, 9:05 AM
Ford Enlists Wind Energy Corp. to Provide Wind, Solar Energy to Four U.S. Dealerships
November 10, 2014, 10:58 AM
Disney Reveals Star Wars Ep. VII Title -- "The Force Awakens"
November 6, 2014, 3:45 PM
U.S. Navy Lockheed F-35C Completes First Carrier Landing
November 4, 2014, 12:44 PM
Microsoft Co-founder Paul Allen Donates $100M to Fight Raging Ebola Epidemic
October 23, 2014, 6:05 PM
Most Popular Articles
Wal-Mart: Miss Thanksgiving, Get Xbox One + Master Chief Collection for $299
November 17, 2014, 9:40 PM
Nokia Lumia 635 LTE Windows Phone is Only $40 at Best Buy on Black Friday
November 18, 2014, 11:59 AM
Sweden Mulls Labelling "Sexist" Video Games in the Wake of Gamergate
November 17, 2014, 2:00 PM
It's Official: Twitter is Profitable "Junk"
November 16, 2014, 10:45 PM
Austrian Pilots Call Surface 3 Pro Flight Bag a "Dream Come True"
November 14, 2014, 2:00 PM
Latest Blog Posts
Costco Gives Employees Thanksgiving Off; Wal-Mart Leads "Black Thursday" Charge
Oct 29, 2014, 9:57 PM
"Bear Selfies" Fad Could Turn Deadly, Warn Nevada Wildlife Officials
Oct 28, 2014, 12:00 PM
The Surface Mini That Was Never Released Gets "Hands On" Treatment
Sep 26, 2014, 8:22 AM
ISIS Imposes Ban on Teaching Evolution in Iraq
Sep 17, 2014, 5:22 PM
Space Terrorism is a Looming Threat For the United States
Apr 23, 2014, 7:47 PM
More Blog Posts
Copyright 2014 DailyTech LLC. -
Terms, Conditions & Privacy Information