Wireless charging of electric vehicles uses electromagnetic induction to transfer energy between two objects through an electromagnetic field without the need for wires. It works by generating a 20kHz frequency into the field by an inverter, which is then picked up by a receiving device on the electric vehicle to power its batteries while driving. The technology would allow electric vehicles to operate with much smaller batteries and charge while in motion. However, it requires burying electric power strips under roads connected to the grid and has high initial installation costs.

1. C
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Introduction
What are EVs?
Need forEVs.
Types of charging system for EVs.
What is wireless charging ?
Why not wires?
History.
Working.
Construction of roads.
Advantages & disadvantages.
Conclusion.
References.

2. INTRODUCTION
The eco-friendly vehicle is the global trend in the automobile industry.
The electrical vehicle (EV) is the most suitable alternative of petroleum
vehicles.
The large capacity, weight, expensive price, short life time, and charging time
of battery obstruct the commercialization of EV.
To solve these problems, wireless charging of electric vehicle is
introduceded.

3. WHATA
R
EE
V
S(ELECTRICVEHICLES)?
An electric vehicle (EV)uses one or more electric motors for propulsion.
An electric vehicle may be powered through a collector system by electricity from off-
vehicle sources, or may be self-contained with a battery or generator to convert fuel to
electricity.
EVs include road and rail vehicles, surface and underwater vessels, electric aircraft and
electric spacecraft.

4. N
E
E
DF
O
RE
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S
 Global Warming / Climate
Change.
 Rising Prices.
 Acid Rain.
 Effect on Human Health.
 Impact on Aquatic Life by Oil
Spills.

5. T
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FC
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Conductive Charging
It utilizes connector between the
Electric power source and
vehicle battery.
This type of charging is utilized
in Residential areas.
Inductive Charging
Wireless charging coupled with
magnetic resonance to transfer
power from a transmitting pad to
a receiving pad.
Battery Switching
Depleted EV battery pack
is switched with a fully
charged battery pack in
the switching station.

6. WHATISW
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SC
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G?
Wireless charging uses an electromagnetic field to transfer energy between two objects
through electromagnetic induction.
Energy is sent through an inductive coupling to an electrical device, which can then use that
energy to charge batteries or run the device.

7. i. As per studies, most electrical energy
transfer is through wires.
ii. Most of the energy loss is during
transmission
iii.On an average, more than 30%
iv.In India, it exceeds 40%

8. H
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FW
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SP
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• In 1901, Nikola Tesla was able to transfer energy
from one coil to another coil wirelessly.
• 187 feet tall tower to broadcastenergy
• He managed to light 200 lamps from a distance
of 40km.
• Due to shortage of funds, tower did not operate.
• The idea of Tesla is taken in to research after
100 years by a team led by Marin Soljačić from
MIT. The project is named as ‘WiTricity’.

9. H
O
WITW
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K
S
:
 Specifically, the technology works by generating 20kHz frequencies into an electromagnetic
field by a power inverter which are embedded.
 Wireless charging Electric Vehicles are built with an on-board pick up device that allows an
electric vehicle to be powered by an underground power line while driving.
 This allows the vehicle to carry 4/5 less battery capacity or weight, because it only requires a
small battery for minimal operations off the power grid.

10. C
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T
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NO
FAR
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Electric power strips are buried 30 cm deep under the
road surface and connected to the power grid.

12. A
D
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T
A
G
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S
:
80 %reduced operating cost than equivalent gas powered vehicles.
Lower maintenance costs than gas powered vehicles .
Pollution free.
Zero recharging time and unlimited range (when operating on an grid road).
Light weight vehicles.
A number of EVscan be charged at atime.
Electrically safe.
Charging is convenient.

13. DI
S
ADVAN
T
AG
E
S
:
Initial installation cost is very high.
Working area islimited.
Currently the speed is limited to 40 miles perhour.
power outage might cause the EVsto run out of charge.
Heat generation is more than traditional charging.
Complexdesign.
Construction of wireless charging road isrequired

14. C
O
N
C
L
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SION:
Charging electric vehicles wirelessly- a reality.
Low maintenance cost but high initial cost.
Better then conventional wired system.
Energy crisis can be decreased.
Low power loss
In the future world will be completely wireless.

15. R
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F
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1. Nicola Tesla, “The transmission of electrical energy without wires”, Electrical World and Engineer, March
1905. http://www.tfcbooks.com/tesla/1904-03-05.htm, (acc. Dec. 08)
2. William C.Brown, “The history of power transmission by radio waves”, Microwave Theory and Techniques,
IEEETransactions, 32(9):1230-1242, September 1984.
3. A.B. Kurs,A. Karalis, R.Moffatt, J.D.Joannopoulos, P.H. Fisher, and M. Soljacic, “Wireless Power Transfer via
Strongly Coupled Magnetic Resonances”, Science, 317, pp. 83-86, (2007).
4. A. Karalis, J.D.Joannopoulos, and M. Soljacic, “Efficient Wireless Non-radiative Mid- range Energy Transfer”,
Ann. Phys., 323, pp. 34-48, (2008); published online April 2007.
5. J.D. Joannopoulos, A. Karalis, and M. Soljacic, “Wireless Non-Radiative Energy Transfer”, U.S. Patent
Numbers 7,741,734; 8,022,576; 8,084,889; and 8,076,800.
6. A. Karalis,A.B. Kurs, R.Moffatt, J.D.Joannopoulos, P.H. Fisher, and M. Soljacic, “Wireless Energy Transfer”,
U.S. Patent Numbers 7,825,543 and 8,097,093.
7. A. Karalis, R.E.Hamam, J.D.Joannopoulos, and M. Soljacic, “Wireless Energy Transfer Including Interference
Enhancement”, U.S.Patent Number 8,076,801.

16. THANKS!