2. WIRELESS POWER
ï Transmission of energy through the air.
ï Process of transferring electric energy or
power over distance without wires.
ï Also known as âWiTricityâ and â Wirelss
Power Transmissionâ.
ï Eliminates the use of cables for
transmission of power.
3. History of Wireless Power
ï In 1899,Sir Nikola
Tesla proposed a
method of Wireless
Power Transmission.
ï Tesla enlighten 200
lamps at the
distance of 40 km.
But only 15%
efficiency was
achieved.
ï As it is in Radiative
mode , most of the
Power was wasted
and has less
efficiency.
4. The Forgotten Invention is
reborn in 2007
ï A group of
engineers at MIT
came up with the
idea to use resonant
induction to transmit
power wirelessly.
ï MIT powered 60
watt light bulb from 2
mts (7 ft) at 40%
efficiency.
ï First practical
example of Witricity.
5. How Wireless Power Works?
ï 1.Magnetic coil is
housed in a box and
can be set in wall or
ceiling.
ï 2.Antenna A,
powered by mains
,resonates at a specific
frequency.
ï 3. Electromagnetic
waves transmitted
through the air.
ï 4. Second magnetic
coil (Antenna B) fitted
in laptop/TV etc
resonates at same
frequency as first coil
and absorbs energy.
ï Energy charges the
device.
7. Working Principle
ï One Simple Physics rule !
ï At source : Electricity => Magnetic
Wave
ï At Device : Magnetic Wave =>
Electricity
8.
9.
10.
11. ï Batteries can be
charged , it is just
enough to place
the device to top
of one of these
surfaces
12. WPT makes products:
More Convenient:
âą no manual
recharging or
changing batteries.
âą Eliminate unsightly ,
unwieldy and costly
power cords.
More Reliable
âą never run out of
battery power.
âą Reduces product
failure rates by fixing
the âweakest linkâ.
13. Advantages
ï Safe ,fairly efficient ,good range.
ï Getting rid of great deal of cables !
ï More secure , no risk of getting
shocked.
ï Placed where you cannot have
physically cable ,solution wiTricity
ï No wires.
ï Need for battery is eliminated.
ï Ewaste is eliminated.
14. Disadvantages
ï wireless power transmission can be
possible only in few meters.
ï Efficiency is only about 40%.
ï Need for standardization and
adaptation. So a little over heating
occurs because of different voltages.
ï Refitting old equipment or purchasing
new equipment could become a very
expensive endeavor.
ï Possibility of âenergy theftâ.
15. HOW SAFE IS WITRICITY
ï Human beings or other objects placed
before the transmitter and receiver do
not hinder transmission of power.
ï Magnetic fields tend to interact very
weakly with the biological tissues of
the body, and so are not prone to
cause any damage to any living
beings.
16. Conclusion
ï Think that the city
will be covered with
WPT hotspots ,just
like wireless
internet there will
be no need of
charging batteries,
or carrying
adapters all
around.