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  • We'd all love to become less dependent on our phone chargers, but current wireless charging

  • options just aren't there yet.

  • So, what if we could charge our phones..with WIFI?!

  • Wireless charging devices on the market now use something called electromagnetic induction.

  • First, a coiled wire in a charging pad turns an electric current into a magnetic field.

  • Then that field is received by another coiled wire in your device that turns it back into

  • electricity and charges the battery.

  • But, most of the inductive charging devices we have today require direct or very close

  • contact between the device being charged and the source of the magnetic field.

  • Which doesn't do much to resolve that feeling of being tethered to an outlet.

  • And while some researchers are looking for ways to extend the distance of magnetic induction,

  • others are instead looking at how radiofrequency signals (like wifi) could be used to do the

  • same thing.

  • To clarify- this isn't new- researchers have been working on it for a while now.

  • And charging via radiofrequency (or RF) signals actually works pretty similarly to magnetic

  • induction.

  • First, a transmitter (think: your wifi router) sends out an RF signal.

  • Then, a specially designed rectifying antenna (or rectenna) in your device picks up that

  • signal, and converts it into an electric current.This is a super promising technology- but there

  • are some drawbacks that have made developing it challenging.

  • The first being charge.

  • Current WIFI routers don't emit that much power, and so would be limited to charging

  • low power devices like sensors or fitness trackers.

  • And that would be awesome for applications like the internet of things.

  • Which is, hold on on sec,I've got unlimited data with Visible, so let me get a definition

  • for you.

  • Which isthe networking capability that allows information to be sent to and received

  • from everyday objects and devices using the Internet"

  • But, making RF charging work for things like our phones will likely involve setting up

  • a new type of RF transmitter, as well as installing rectennas in any device we want to charge.

  • That also presents a bit of a chicken or the egg dilemma.

  • Do you install the rectennas first, or the transmitters first?

  • Then there's the issue of distance.

  • The farther away from the transmitter you get, the less power you'll be able to pick

  • up.

  • Finally, all of these systems need to get agencies like the FCC to say they're safe

  • before they can be sold to consumers.

  • And that can take a lot of time.

  • But despite all of these challenges, we're seeing a lot of progress.

  • One company called Ossia has developed an RF receiver and transmitter duo called Cota.

  • The receiver inlet's say your phonefirst sends beacon signals in various directions

  • around the location you're in.

  • The transmitter picks up these signals and then responds by sending concentrated RF waves

  • along the same paththus charging your phone.

  • This helps provide more energy to the device than other systems, since you have a focused

  • RF signal instead of casting the power over a large area.

  • Ossia also debuted a new phone case and transmitter combination at CES this year, that allows

  • for continuous phone charging at up to 12 ft.

  • But it's just a proof of concept.

  • Another promising design is from a company called Energous.

  • Their technology called WattUp can charge small devices with RF energy at a distance

  • of 3 ft - AND it's already gotten FCC approval!!!!!

  • And they also have a newer version in the works that claims to charge more devices at

  • a new distance of 15ft!

  • Even more, a new study from MIT has found a way to make rectennas flexible, and do it

  • with cheaper materials.

  • Which could mean wearables powered by WiFi?

  • All in all, it doesn't seem like we're that far off from real wireless charging at

  • a distance, and ditching those phone chargers once and for all.

  • So what do you guys think- would you buy one?

  • Well what about buying a new provider?

  • Visible is the new way to think about phone service.

  • No stores.

  • No annual contracts.

  • No hidden fees.

  • Just 40 bucks a month for unlimited messages, minutes, and data at speeds up to 5 megabits

  • per second.

  • All on Verizon's 4G LTE Network.When you think the future of phone service, think Visible.

  • Don't forget to subscribe for all your energy science needs, and for more on the future

  • of wireless charging, check out this video.

  • One last thing- we only had time to talk about induction and RF charging-- but some researchers

  • are also working on wireless charging with infrared light.

  • Man, the future is gonna be awesome.

  • As always thanks for watching, and I'll see you next time on Seeker.

We'd all love to become less dependent on our phone chargers, but current wireless charging

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B1 INT charging rf transmitter wireless charging wireless wifi

Wireless Electricity Is Coming, Here’s Where We’re At

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    林宜悉   posted on 2020/03/30
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