1. HIGHLY RESONANT WIRELESS POWER TRANSFER:
SAFE,EFFICIENT,AND OVER A DISTANCE

3.  The transmission of energy from one place
to another without using wires
 Conventional energy transfer is done using
wires ,which has certain limitations.

4.  To fulfil the ever increasing demand of nation.
 It is efficient and reliable.
 Its applications are eco-friendly.
 Safe for humans.
 Low maintenance cost.
 Can be used for short-range and long-range
transmission.

5.  Wired transmission of electrical energy is lossy.
 Globally on an average about 30%.
 In India its about 40% or more.
 Billions, trillions of $ are spent on wires and in
their installation.
 Waste management is a challenge in 21st century..
 40 billion disposable batteries added to e-waste
every year.
 PVC is non-biodegradable.

6.  NETWORK OF
WIRES ON
ELECTRIC POLES
IN DARYAGANJ,
 NEW DELHI

8. WHAT IS THE SOLUTION THEN ????
WITRICITY

10. History
The inventor Nikola Tesla dreamt of
wireless power.
He built a coil,later named
‘Tesla coil’.
Tesla coils could illuminate the lamps
from across the room and throw the
occassional built of lightning on the
nearest conductor.
His vision was different from WiTricity
but helped

11. An unsuccessful experiment :
Nikola tesla believed in wireless power
with such an enthusiasm that with the
financing of J.P.Morgan,he built a giant
apparatus called:
“THE WARDENCLIFF TOWER”
At his lab on the shore of long island,NY, in
the year 1901.
THIS WAS BEFORE THE WORLD WAS
WIRED.
Tesla coils remain popular
today,though,often for their ability to put
on a fantastic lightning show.

13.  In 2007,6 MIT members headed by Marin Soljacic were able to
successfully transmit power to a bulb within a distance of 2m at a
frequency of 9.9MHz
 Resonance
 inductive coupling
 Efficiency at that point was just approximately 43%

14.  Bluetooth
 Wi-Fi
 NFC (Near Field Communication)
 Satellite communication
 Cordless mouse, keyboard, mobiles,
microphones and headphones.

15.  Near Field Techniques
 Inductive Coupling (Short range)
 Resonant Inductive Coupling (mid range)
 Far Field Techniques
 Laser power Transmission
 Microwave Power Transmission (long range)
 Solar power Satellite(SPS)

16. NEAR FIELD TECHNIQUES

17. Uses electromagnetic induction
concept-Electromagnetic
induction is the production of
a potential difference (voltage)
across a conductor when it is exposed
to a varying magnetic field.
Two conductors are referred to
as mutual-inductively
coupled or magnetically
coupled when they are configured
such that change in current flow
through one wire induces a voltage
across the ends of the other wire
through electromagnetic induction.

19. RESONANT INDUCTIVE
COUPLING
Uses almost the same
concept as Inductive
coupling just that the
coils operate at resonant
frequency leading to
efficient transfer of
energy over a larger
distance

21.  RIC is highly efficient
 RIC has much greater range than
inductive coupling
 RIC is directional when compared to
inductive coupling
 RIC can be one-to-many. but usually
inductive coupling is one-to-one
 Devices using RIC technique are
highly portable

22. FAR FIELD TECHNIQUES

23. MICROWAVE POWER TRANSMISSION (MPT)
 Transfers high power from
one place to another.
 Two places being in line of
sight usually.
 Electrical energy converted
to microwave energy using
magnetron.
 Capturing microwave using
rectenna.
 Conversion of microwave
energy into electrical energy.
 Transmission of electrical
energy.

24. LASER POWER TRANSMISSION
 LASER is highly directional
and coherent
 But, gets attenuated when it
propagates through
atmosphere
 Simple receiver
 Photovoltaic cell
 Cost-efficient

25. SOLAR POWER SATELLITES
 Satellites are placed in
geostationary orbit
 Solar energy is captured using
photocells
 Each SPS may have 400 million
photocells
 Transmitted to earth in the form of
microwaves/LASER
 Using rectenna/photAovoltaic cell,
the energy is converted to
electrical energy
 Efficiency exceeds 95% if
microwave is used.

26. Block diagram for witricity mechanism

29. CONSUMER ELECTRONICS
Photographs of a wirelessly powered laptop computer (left) and a D-Cell formfactor
battery with wireless charging built in (right).
The laptop PC is being powered directly by a wireless power source deployed
behind the cork board, delivering over 20 watts of power over a 40 cm distance.
the D cell form factor battery shown charging is enabled for wireless energy
capture, and can charge at a distance of over 10 cm from the wireless charging
source.
Analysts expect that the benefits of charging over distance and with spatial
freedom will result in highly resonant wireless power transfer capturing over 80%
market share of all wireless charging systems by 2020.

31. MEDICAL DEVICES
Pictures showing two examples of HR-WPT charging applications in medical
devices: Left ventricular assist device (LVAD) (left) and pacemakers (right).
Wireless charging systems are being developed for implanted medical devices
including LVAD heart assist pumps, pacemakers, and infusion pumps
The HR-WPT technique eliminates the need for drive lines that penetrate the
human body, and for surgical replacement of primary batteries.

32. ELECTRIC VEHICLES
Photograph showing an application of HR-WPT for charging full electric and
hybrid vehicles.
Wireless charging systems are being developed for rechargeable hybrid and battery electric
vehicles. These systems already deliver 3.3 kW at high efficiency over a distance of 10 cm -20
cm (typical vehicle ground clearances).
FIGURE shows the Audi Urban Concept Vehicle, demonstrated by Audi in April, 2012.
It is expected that wireless charging will vastly improve the charging experience for EV owners,
making such vehicles even more attractive to consumers.

34. LED LIGHTING
Photographs showing LED lights directly powered by highly resonant wireless
energy transfer systems.
LED (light emitting diode) lights can be directly powered with wireless
electricity.
The LED fixture shown in the left photo in Figure is powered by a 10 W
source mounted above the ceiling.

35. DEFENCE SYSTEMS
Photographs showing several military applications for highly resonant wireless
charging systems: military robots (left) and soldier electronics (right).
The Talon tele-operated robot shown in Figure is being equipped with
wireless charging so that it can be recharged while it is being transported by
truck from site to site.

38. Efficiency chart of
witricity
It is observed that efficiency decreases with
increase in distance between source coil and
load coil

40.  Will it harm me?
 Will it harm the environment?
 Will it interfere with important
communication?
NO
7/30/2015WiTricity40

41. Advantages:
1.Make devices more convenient and thus more desirable to
purchasers, by eliminating the need for a power cord or battery
replacement.
2.Make devices more reliable by eliminating the most failure
prone component in most electronic systems—the cords and
connectors.
3.Make devices more environmentally sound by eliminating the
need for disposable batteries.
4.Make devices safer by eliminating the sparking hazard
associated with conductive interconnections, and by making them
watertight and explosion proof by eliminating
connector headers and wires that run through roofs, walls or
other barriers (even skin tissue).
5. Reduce system cost by leveraging the ability to power multiple
devices from a single source resonator.

42. Disadvantages:
1.For short and mid range transfer system has to be set at the right
frequency or there would be no power transfer.
2.For long range the installation cost is high while EMI is also a
concern.

43. A THOUGHT :
Wireless electricity is not just a great idea but an urgent measure
that has to be taken to deal with the current energy crisis.
Even the smallest entity can lead to one of the most mindboggling
dilemmas of the world. Electrons the source of electricity put us in a
similar fix. It is on us to decide how to tap these electrons to be
useful in our lives.
Wireless electricity comes with its baggage but none can deny that it
is here to stay.
Prospects & Issues:
From the discussion its clear that this idea needs awareness to remove
doubts from minds of the people about safety issues.
It requires both support from government and the people financially
and psychologically.

44. CONCLUSION :
The applications of wireless power in a wired
world are endless and rethinking of the
infrastructure is a decades away.
With such a wide-ranging application space, I feel
that the use of resonance to enhance wireless
power transfer will be prevalent in many areas of
life in the coming years.
At the end of the day,if you can find something
that is convinient to the people and saves
energy,that’s the killer app……….

45. References:
• An article published in the Science Magazine as “Wireless Power
Transfer via Strongly coupled magnetic fields ”
•“Efficient Non-Radiative Midrange Energy Transfer” by Aristeidies
karalis, Marlin Soljacic,2006.
• http://ieeexplore.ieee.org/Xplore/
• www.WiTricity.com
• www.techjournal.com
• www.wikipedia.org
• http://www.sciencedirect.com/science/journals