Tag Archives: Wireless electricity

Wireless electricity: Scientists send energy 55 meters away through air

Japanese scientists have made a breakthrough step towards developing new energy source for humans in the future by for the first time transmitting electric power wirelessly to a pinpoint target using microwaves.

Japanese scientists from the Japan Aerospace Exploration Agency (JAXA) have succeeded using microwaves to deliver 1.8 kilowatts of power through the air to a pinpoint target 55 meters away, a spokesman for the agency said.

“This was the first time anyone has managed to send a high output of nearly two kilowatts of electric power via microwaves to a small target, using a delicate directivity control device,” he said as quoted by AFP on Thursday.

Though the energy was only enough to run an electric kettle and the distance was not huge, this appears to be a giant leap in developing new energy sources. The successful experiment could pave the way to collecting inexhaustible solar energy in space and transmitting it to Earth, the researchers said.

The International Space Station and other satellites have been able to collect solar energy and use it for maintaining work. The main benefit of solar power generation in space instead of Earth is the permanent availability of energy regardless the weather conditions or the time of the day.

JAXA has been working for years on the Space Solar Power Systems project (SSPS) which envisages a space-based solar power plant that generates energy by collecting sunlight in geostationary orbit.

“SSPS consists of a space-based power generation/transmission facility that gathers sunlight, converts it into microwaves or laser beams, and transmits those to the ground; and a power receiving facility on the ground,” said lead researcher Yasuyuki Fukumuro.

Read more » http://rt.com/news/240193-wireless-electricity-send-energy/

Wireless electricity? It’s here

By Matthew Ponsford and Nick Glass, CNN

(CNN) — Katie Hall was shocked the second she saw it: a light-bulb glowing in middle of a room with no wires attached.

Looking back, it was a crude experiment, she remembers: a tiny room filled with gigantic cooper refrigerator coils — the kind you’d see if you cracked open the back of your freezer.

She walked in and out between the coils and the bulb — and still the bulb glowed.

“I said: ‘Let’s work on this. This is the future.'”

What’s the trick?

“We’re going to transfer power without any kind of wires,” says Dr Hall, now Chief Technology Officer at WiTricity — a start-up developing wireless “resonance” technology.

“But, we’re not actually putting electricity in the air. What we’re doing is putting a magnetic field in the air.”

It works like this: WiTricity build a “Source Resonator” — a coil of electrical wire that generates a magnetic field when power is attached.

If another coil is brought close, an electrical charge can be generated in it. No wires required.

“When you bring a device into that magnetic field, it induces a current in the device, and by that you’re able to transfer power,” explains Dr Hall.

And like that, the bulb lights up.

Wireless homes

Don’t worry about getting zapped: Hall assures that the magnetic fields used to transfer energy are “perfectly safe” — in fact, they are the same kind of fields used in Wi-Fi routers.

In the house of the future, wire-free energy transfer could be as easy as wireless internet.

If all goes to WiTricity’s plans, smartphones will charge in your pocket as you wander around, televisions will flicker with no wires attached, and electric cars will refuel while sitting on the driveway.

WiTricity have already demonstrated their ability to power laptops, cell-phones, and TVs by attaching resonator coils to batteries — and an electric car refueller is reportedly in the works.

Hall sees a bright future for the family without wires:

“We just don’t think about it anymore: I’m going to drive my car home and I’m never going to have to go to the gas station and I’m never going to have to plug it in.

“I can’t even imagine how things will change when we live like that.”

World outside

Beyond these effort-saving applications, Hall sees more revolutionary steps.

When Hall first saw the wireless bulb, she immediately thought of medical technology — seeing that devices transplanted beneath the skin could be charged non-intrusively.

WiTricity is now working with a medical company to recharge a left-ventricular assist device — “a heart-pump essentially.”

The technology opens the door to any number of mobile electronic devices which have so far been held back by limited battery lives.

“The idea of eliminating cables would allow us to re-design things in ways that we haven’t yet thought of, that’s just going to make our devices and everything that we interact with, that much more efficient, more practical and maybe even give brand new functionality.

Read more » CNN
http://edition.cnn.com/2014/03/14/tech/innovation/wireless-electricity/index.html