Feeds

Intel powers netbook via thin air

Wireless juice due 2015

High performance access to file storage

Research@Intel Wireless power transmission has taken another step towards commercial reality.

At its eighth annual Research@Intel event on Thursday in Mountain View, California, the chip giant gave a crowd-gathering demo of what it calls a Wireless Resonant Energy Link (WREL).

The demo setup included a hefty transmitter and receive-coil pair in which the receive coil had at its center a small speaker, with both the audio signal and the power required to drive the speaker being transmitted wirelessly.

The WREL, as its name implies, transmits power by setting up a resonant relationship between the transmitter and the receive coil, much as does the battery recharger in your wireless electric toothbrush.

However, as Intel researcher Emily Cooper told The Reg, the WREL's power transmission is "very different from the electric toothbrush charger [power] that falls off after about a millimeter."

Although the demo was transmitting only about one or two watts at a distance of over a meter, Cooper claimed that in Intel's Seattle lab, they've managed to power a netbook at distances of between one and two meters, providing between 14 and 20 watts. She also said that lab tests had powered 40 and 60-watt light bulbs.

Research@Intel: Wireless Resonant Energy Link demo

Intel's wireless-power prototype - transmitter on the right, speaker-equipped receive coil on the left

Cooper demonstrated that the receiver didn't drop or attenuate the signal when it changed its orientation in the transmitted beam. Even at a 90 degrees orientation to the transmitter, the receive coil's tinny speaker's tunes remained equally tinny. Her explanation: "As long as we're capturing some of the flux from this source, we can transduce that."

She also pointed out that the transmitted power is not subject to the familiar inverse square law, which decrees that signal strength is inversely proportional to the square of the distance from the transmitter. "That's what's interesting about this coupling mechanism," she said, "there are ways to make the transfer efficiency constant until you reach a certain point."

When asked what would happen to the signal strength if there were something between the transmitter and the receive coil, Cooper said there'd be a problem "only if there were a Faraday Cage in the middle," and that "certainly this transmitter could be embedded in a wall with plasterboard over it and that wouldn't effect the transmission."

Even such wetware as human beings walking through the transmission path shouldn't effect the signal: "People, not so much - there's really not good coupling with people," Cooper said.

Wireless power transmission has been a dream since the days of Nikola Tesla, and although some progress has been made by researchers at MIT and elsewhere, most wireless-power devices have been of the electric-toothbrush variety.

Wireless-power company Fulton Innovation, for example, has been at it for some time, even demonstrating a wirelessly powered blender. However, that appliance needs to be placed on what the company calls an "Access Point" before it can make a strawberry-banana smoothie.

Powermat also showed wireless rechargers at this year's CES, but again the device to be recharged needs to be placed directly on their eponymously named Powermats. And then there's the progress being made in tiny remote sensors called WISPs (wireless identification and sensing platforms) that draw their power from the ambient energy emitted by sources such as WiFi hotspots, cell towers, or TV broadcast signals.

Of course, there's been a great deal of hubbub - and conflicting studies - about the possible ill effects of even such low-power, inverse-square-law-obedient signal sources as cell-phone towers. Intel is aware of the controversy and has said in a statement about the WREL that "We are investigating the safety and regulatory issues. It is too early to definitively evaluate the safety or regulatory compliance of any proposed product, as basic properties such as transmitted power levels and safety features have not been set yet."

In addition to its regulatory challenges, existing WREL technology is clearly far too large for most commercial uses, but Cooper said that the size of the receive coil is "something we're working on and that's very important to this application space." The goal, she said, is "to be able to scale these to cell-phone size, to laptop-size."

When asked when shrinking the receive coil to a manageable size might allow WREL-enabled products to appear in your local electronics boutique, Cooper said that mid-next-decade was a "reasonable estimate." ®

High performance access to file storage

More from The Register

next story
Feast your PUNY eyes on highest resolution phone display EVER
Too much pixel dust for your strained eyeballs to handle
Samsung Galaxy S5 fingerprint scanner hacked in just 4 DAYS
Sammy's newbie cooked slower than iPhone, also costs more to build
Microsoft lobs pre-release Windows Phone 8.1 at devs who dare
App makers can load it before anyone else, but if they do they're stuck with it
Report: Apple seeking to raise iPhone 6 price by a HUNDRED BUCKS
'Well, that 5c experiment didn't go so well – let's try the other direction'
Rounded corners? Pah! Amazon's '3D phone has eye-tracking tech'
Now THAT'S what we call a proper new feature
Zucker punched: Google gobbles Facebook-wooed Titan Aerospace
Up, up and away in my beautiful balloon flying broadband-bot
Nvidia gamers hit trifecta with driver, optimizer, and mobile upgrades
Li'l Shield moves up to Android 4.4.2 KitKat, GameStream comes to notebooks
AMD unveils Godzilla's graphics card – 'the world's fastest, period'
The Radeon R9 295X2: Water-cooled, 5,632 stream processors, 11.5TFLOPS
Sony battery recall as VAIO goes out with a bang, not a whimper
The perils of having Panasonic as a partner
NORKS' own smartmobe pegged as Chinese landfill Android
Fake kit in the hermit kingdom? That's just Kim Jong-un-believable!
prev story

Whitepapers

Securing web applications made simple and scalable
In this whitepaper learn how automated security testing can provide a simple and scalable way to protect your web applications.
Five 3D headsets to be won!
We were so impressed by the Durovis Dive headset we’ve asked the company to give some away to Reg readers.
HP ArcSight ESM solution helps Finansbank
Based on their experience using HP ArcSight Enterprise Security Manager for IT security operations, Finansbank moved to HP ArcSight ESM for fraud management.
The benefits of software based PBX
Why you should break free from your proprietary PBX and how to leverage your existing server hardware.
Mobile application security study
Download this report to see the alarming realities regarding the sheer number of applications vulnerable to attack, as well as the most common and easily addressable vulnerability errors.