Wireless charger can power 40 mobile phones at once from 15 feet away


By now, most people have seen a wireless charger. It probably looked like a pad that charges mobile devices set directly on top of it. But a future generation of wireless chargers will be capable of providing power across a room without users ever having to set their device down or plug it in.

A team at the Korea Advanced Institute of Science and Technology recently demonstrated a new option for wireless charging: a nine-foot-long box packed with coils that can deliver power to up to 15 feet away with a magnetic field. The team debuted the system last week and in March used it to power equipment at a nuclear power plant.

DCRS is not the first approach to long-distance wireless charging. Cota, a wireless power platform set to be commercially available next year, can charge devices from nearly 30 feet away. But even at the prototype phase, DCRS can already pack a lot of power. It can charge up to 40 mobile devices at once and larger devices like TVs.

A prototype of the Dipole Coil Resonant System can power a LED television from 15 feet away. Photo courtesy of KAIST.

A prototype of the Dipole Coil Resonant System can power a LED television from 15 feet away. Photo courtesy of KAIST.

“Just like we see Wi-Fi zones everywhere today, we will eventually have many Wi-Power zones at such places as restaurants and streets that provide electric power wirelessly to electronic devices,” research team lead Chun Rim said in a release. “We will use all the devices anywhere without tangled wires attached and anytime without worrying about charging their batteries.”

The team created the DCRS prototype by improving upon existing systems that use a magnetic field to transfer power. The team said that it is more efficient, simpler and less sensitive to interference from factors like temperature and humidity. It’s much larger than a system like Cota, but it’s supposedly scalable.



Everything metal, or conductive will be absorbing this power.

It is like filling a thimble by throwing a bucket of water at it from 10 meters away.

Efficiency ? If it is greater than 10% I will be impressed.

Yes it is just like a Transformer, but not efficient.

Andreas Georgiou

Any health problems? from Magnetic fields and other unknowns?


My wife and daughter have extreme sensitivity to magnetic fields. They have tried various magnet therapy devices (pillows, necklaces, bracelets, etc) almost always receiving headaches as a result. I never notice anything when using the same devices. Other have issues with florescent lighting due to the “flicker” though most of us don’t notice. I have a feeling that at least a small subset of society will have problems when encountering these magnetic fields.

Anthony Johnson

This technology should be available soon as our offices are just looking like a trap of wires while charging Smartphones. This will reduce the dependency of hardware as only single charger can easily charge up to 40 Smartphones. I like the concept of qi wireless charging by just put my Nexus 5 on wireless charging pad that I purchased from Amazon http://www.amazon.com/gp/product/B00FPFRNTQ , anywhere and it starts charging it without messing up with wires.


what happens to the living tissue in the middle of this strong magnetic field?


Our bodies also have magnetic fields, and near where I live, all the plant life around the large power transformers has totally died (including along the path under the wires).

I’d be wary of being anywhere remotely close to one of these things for any length of time.


Nice idea, one step closer to Nicola Tesla’s dream of wireless power. The is hazardous to human health, however. The field strengths required to radiate this much power are very strong and interfere with electronics and biological processes.


people with pace makers should stay away from this unit or else along with mg stripes your heart beat will also be erased….


Such a bad idea. Pacemakers, tons of other devices could be impacted by this. There may also be health concerns just from the MRF on normal people as well. Then consider the power loss to do this. Even Qi based chargers, which limit charging to *very* close proximity with small, closely linked coil sets, get about 70% transference at best. Most inductive charging gets under 50%. Something like this, I’d be shocked if 10% of the energy used to power it was actually absorbed by anything. (And yes, just like any transformer, this takes energy just by the fact that it’s getting power. It takes more if something is in the field and actively using it, but there’s a constant loss factor even if nothing is in the field.)


Has anyone considered the health risks that may be involved, remember all the fervor over whether cell phones can cause brain cancer?


30 years later and everybodys organs will stop functioning

Carlos Hernandez Gamboa

Nikola Tesla is still alive. But what are the harmful health effects? And for devices non protected against electromagnetic field? I can only think on the people with pacemakers.. Well let’s see what happens.


Brain surgeons are seeing a record number of brain tumors on the side of patient’s heads where they hold their wireless phone. Incidence of cancer in residents near high voltage power lines is substantially higher than the norm.

We have enough electro magnetic, micro-wave and other such harmful emissions in our day-to-day world.

I’m all for progress and time saving inventions, but the safety issues need to be part of the mix.


It’ll save on hair cuts when everyone’s hair starts falling out!


These magnetic field rays may affect the human???If he/she cross these rays….and this DCRS want to plug in wright!!!!!!!!!!!!!

Manuel Alejandro Arredondo

so are you telling me having oscillating magnetic fields all around us will not be harmful to all the other electronic devices?

Robert Lee Louviere


As long as the other components are not able to resonate with the osciallation, they shouldn’t be affected.


operative words = “SHOULD NOT” – sort of like tobacco science


“Why is everyone glowing?
mag stripes will be erased
questions regarding the safety of exposure

Please! If you are going to write a piece on a new technology (that you clearly do not understand) get the facts straight. In this case please contact MIT Professor Marin Soljačić and have him give you a 15-minute overview on MR technology. Then you may remove your ‘glowing’ comment and address the other false safety and security assumptions people have voiced.

Chuck McGinley

While they are at it, they may want to make reservations to move off the planet Earth if they fear magnetic fields. :-)


AH yes – we always understand technology – because we invent it – sort of like foot x-ray machines – that led to cancers. Yes, trust the inventors – they understand everything.


Look interesting. I wonder if there could be a minor health risk here due to
the em radiation….

Robert Lee Louviere

Apparently I was wrong.

Basically, they’re using a coil that generates a field. That field is setup to resonate so that similar coils in other devices resonate with it and “accept” the field. Slightly different than relying on the induction field alone.

It’s not radiation. It’s harmonics.

Richard Barr

I assure you your blood is not iron based.

“Most well-nourished people in industrialized countries have 4 to 5 grams of iron in their bodies. Of this, about 2.5 g is contained in the hemoglobin needed to carry oxygen through the blood”

2.5g in 5l of blood? Definitely iron based.

Oh wait, that was sarcasm (too bad it wasn’t irony).

“Plasma, which constitutes 55% of blood fluid, is mostly water (92% by volume)”


But oscillating magnetic fields may still affect humans iron based red corpuscles. There has never been a formal link made between radiated oscillating magnetic fields and human health concerns, but still, natural magnetic harmonics exist and form an existing if subtle framework within which all life on the planet has evolved.

Unfortunately, long term health trials on such technology are impossible. It’s rather like cellphones today. We’re all labrats when it comes to their long term impact on life. Maybe constant exposure to millions of very low power radio wave devices, over decades, induces Alzheimer disease…


Pumping out all that EMF continuously is total waste of power not to mention the cost and size of all those copper coils, basic use of known electrical principles, but stupid.


Mobile (or cellphone) power output is 1.6W/m, anything more e.g. a high power walkie talkie at 10W/m is considered a hazard to me.

So what is the value of these wireless power is? The Korean just make stuff up like they did with human cloning?


My Nexus 5 works directly with WIWOFIT wireless charger bought from Amazon , but as far as I know some smart phone need receiving card.


Nonsense! There is no current technology for the wireless transmission of power!

Chuck McGinley

Well then that completely changes the way I think about the Sun.. I’lll have to rethink this physics thing.. :-)


Watches and laptops are both likely to have issues in magnetic fields too… what about the long term effects on rodents? Did they get cancer?


certainly…another ambigious monry making idea for capitalists, but the fact is…we will certainly be immunized from this shit by the means of evolution and adaptation.


So every employee gets free magnetic resonance sans the imaging all day long, every work week? Not sure constant electromagnetic wave field is the safest idea for the long haul.

Chuck McGinley

You might want to move off of planet earth then. ;-) :-)


Earths magnetic field is extremely small compared to what is being proposed.
lets not get dramatic about comparing the earths magnetic field to one in an MRI machine. Get facts 1st, comment 2nd.


These magnetic fields aren’t harmful at all, so these ‘facts’ are irrelevant


not his dreAm, he ran out of fund… we are yet to dream of his real dreams..

Mike Sullivan

Only problem is that your credit cards’ mag stripes will be erased at the same time as your phone gets charged.

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