But the biggest challenge is still keeping our batteries charged.

But that may be about to get easier， thanks to some local researchers that have taken

wireless charging technology to the next level. Park Se－young reports.

It′s common to see people carrying battery packs or searching for plugs for their chargers.

Wireless chargers are an option， but they only work if the user is within about ten

centimeters of the charger and the device is in certain， fixed positions.

However， a research team at KAIST has developed an omni－directional wireless charging technology

that works like a WiFi zone. Their creation charges devices at a distance

of 50－centimeters from the power source， regardless of the position of the device.

What′s more， it works in low frequency magnetic fields that are not harmful to humans.

The research team placed the charger′s sending and receiving coils in a crisscross pattern

to create rotating magnetic fields. This enables wireless charging in any direction

with six degrees of freedom. The wireless charger that comes with the Samsung

Galaxy S6 has only one degree of freedom， which means it can only charge the phone if

it′s in a fixed position. Just like a WiFi zone， the charger can charge

30 smartphones or five laptops at once，... with a maximum power transfer efficiency rate

of 34－percent. The research team published their findings

in the June issue of IEEE Transactions on Power Electronics.

They are currently working with a local technology firm housed at KAIST to commercialize the

technology for use in cafes and offices. Park Se－young， Arirang News.