How does Qi wireless charging work in Nokia's Lumia 920 and Lumia 820?

With the announcement of integrated wireless charging in the Lumia 920 , Nokia hopes it will be a significant part of the proposition to turn heads from Android and iPhone .This is a standard charging technology built Qi by organizations Wireless Power Consortium performed with many of the member firms such as Nokia, HTC, Sony, Samsung ... and it is also different from the wireless charging the Palm Pre ago.

The way it works is quite easy to understand. Lumia 920 comes with a tray (sole or knee), when you put it on, it will automatically charge cable without plug. Charging will take place almost immediately. Inside the tray with an induction coil, when plugged in to the tray, this coil creates an alternating electromagnetic field, spherical radius of about 4 cm, wrapped around the tray. At the same time the Lumia 920 will also have a similar coil have the ability to connect with the electronic field and converts its energy into electric current, charging directly to the battery. Thus, the machine will charge without having to plug in the cable as traditional.

Capacity, in mid-2009 low power charging standard Qi was born with a capacity of only 5 Watts. Two years later it was upgraded it up to 150 Watt. Although the 5 watt is quite enough to charge the phone, but the upgrade to 150 watts can see in the future Nokia and the carrier will have the tablet also like wireless charger on.
Another advantage of the Qi wireless charging is that it is more firm support and also offers a wide range of products built to this standard. Consortium said the organization currently has 110 certified products Qi standard, including smartphones, charging tray, handle gaming, Blu-ray player, integrated speakers charging (like JBL PowerUp), charging car, clock, battery backup ...

Not all, Lumia 920 users and Lumia 820 will also be happier because Nokia said the shop of the Coffee Bean & Tea Leaf in the U.S. will be pre-installed the wireless docking station so customers can drink coffee while charging for your phone.