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Wireless charging for electrocars


Wireless charging is not a must have, but once you have it, you'll wonder how you ever lived without it.
 
TDK today announced that it plans to "quickly commercialize wireless power transfer systems" for charging electric vehicles and other electric mobility applications.
 
The announcement was made after TDK reached a licensing agreement with Watertown, Mass-based WiTricity, a maker of resonant magnetic coupling technology.
 
WiTricity's technology allows vehicles enabled with wireless charging receiving coils to park over a two-foot square pad, which then begins transferring electricity to the vehicle's battery.

 

 
WiTricity's wireless power transfer works by creating a magnetic field that can be several feet in size. A copper-transmitting coil transfers the power to receiving coils within that magnetic field. The power transfer only occurs when receiving coils are tuned to the proper frequency, in this case 85mHz. WiTricity's vehicle charging pad can transfer up to 3.3 kilowatts to a battery, but the company is also working on a 6.6 kilowatt version.
 
The wireless power transfer is up to 90% efficient, meaning only 10% of the power is lost between the transmitter and receiver. The power can also transfer through roadway materials such as concrete and asphalt, meaning it could be embedded in the ground under a parking space.
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