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1. -wireless electricity
Individual Presentation
By
Gopal sai(09u11a0217).
Guidance: venkateshwarlu sir

2. (summarize)
1) History of Wireless power.
2) Need of Witricity.
3) Basic Principle.
4) Range & Rate of Coupling.
5) Design of Parameters
6) advantage and dis adv.

3. History of Wireless Power:
 In 1899, Sir Nikola Tesla
Proposed a method of Wireless
Power Transmission.
 As it is in Radiative mode, most
of the Power was wasted and has
less efficiency.
 The efficient mid-range power
transfer concept is Witricity. In this
model source and load are in Magnetic
resonance so there is no power loss.
(1856 - 1943)

4. The forgotten invention is reborn in 2007
A group of engineers at MIT came up with the idea to use resonant induction
to transmit power wirelessly.
RESONANCE COUPLING:
“Resonance", a phenomenon that
causes an object to vibrate when
energy of a certain frequency is
applied.
Demonstrating the ability to
power a 60-watt light bulb
from a power source seven
feet away without wires

5. What is Witricity?
 Electricity without wires
 Magnetic loop antennas
 Electromagnetic near-
field

6. Basic Principle:
The basic principle involved in Witricity concept is, Two
objects having same resonating frequency and in Magnetic
resonance at Strongly coupled regime tend to exchange energy ,
while dissipating relatively little energy to the extraneous off-
resonant objects.

7. How does Witricity Work?
 Near-field inductive coupling through magnetic
fields
 Interact weakly with surrounding objects
(biological tissue)

8. Experimental Design:
Our experimental scheme
consists of two Self-resonant coils.
One coil (source coil) is coupled
inductively to an oscillating circuit;
the other (device coil) is coupled
inductively to a resistive load. Self-
resonant coils rely on the interplay
between distributed inductance and
distributed capacitance to achieve
resonance.

9. Need of Witricity:
Now a days there is a Rapid
development of autonomous
electronics like Laptops, Cell-
phones, House-hold robots and all
those devices typically rely on
chemical energy storage(Battery)
As they are becoming daily needs to
present generation, Wire less energy
transfer would be useful for many
applications as above and they need
midrange energy.

10. Witricity Today
 MIT powered 60 watt light bulb from 2
meters (7 ft) at 40% efficiency
 MIT researchers working on improving the
technology

11. Witricity Tomorrow
1) Power from mains to antenna, which is made of copper
2) Resonates 10MHz (electromagnetic waves)
3) Tunnel up to 2m (6.5ft)
4) Electricity received by antenna, also resonating at 10MHz.
5) Energy not transferred to laptop re-absorbed by source antenna.
People/other objects not affected as not resonating at 10MHz

12. WORLD IN OUR DREAM

14. Wireless Power Transmission Options
Advantages:
for Space Solar Power (in upcoming)
☼ Unaffected by the day night cycle, weather or seasons.
☼ This is an eco friendly system..
☼ It is boon for the devices which uses midrange power.
Limitations:
☼ The resonance condition should be satisfied and if any error
exists, there is no possibility of power transfer.
☼ If there is any possibility of very strong ferromagnetic material
presence causes low power transfer due to radiation.

15. And also for high power
transmission
Still it is under research

16. •.
Advantages
• Significant declining of office
space
•No need for meter rooms and
electrical closets.
•Reduction of e-waste by
eliminating the need for power
cords
•Need more light in your office, no
need for electrician. Simply place
the lamp where ever you need it

17. Draw-back
•Need for standardization and
adaptation. So no overheating
occurs because of different
voltages.
•Retrofitting old equipment or
purchasing new equipment could
become a very expensive attempt.
•possibility of “energy theft”. Wi Fi,
someone can be using your
internet or your power.