Nokia
launched Lumia 820 and 920 higher versions
of 800 and 900 series in Europe and US market in the month of Sept / Oct. It
will be launched in India by Nov hopefully.
What I like about this series is the new concept of Inductive
charging, also known as ‘wireless charging’. It uses an electromagnetic field
to transfer energy between two objects. This is usually done with a charging
station. Energy is sent through inductive coupling to an electrical device,
which then can use that energy to charge batteries or run the device.
Induction
chargers typically use an induction coil to create an alternating
electromagnetic field from within a charging base station, and a second
induction coil in the portable device takes power from the electromagnetic
field and converts it back into electrical current to charge the battery. The
two induction coils in proximity combine to form an electrical transformer.
Greater distances can be achieved when the inductive charging system uses resonant
inductive coupling.
Advantages
· Lower risk of electrical shock or shorting out
when wet because there are no exposed conductors. e.g., for toothbrushes and
shavers, or outdoors.
· Protected connections - no corrosion when the
electronics are all enclosed away from water or oxygen in the atmosphere.
· Safer for medical implants - for embedded medical
devices, allows recharging/powering through the skin rather than having wires
penetrate the skin, which would increase the risk of infection.
· Convenience - rather than having to connect a
power cable, the device can be placed on or close to a charge plate or stand.
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