Wireless charger based on Witricity technology. This is the future of Wireless Charging.

1. Welcome

2. WIRELESS CHARGER
BASED ON
WITRICITY
PRESENTED BY
MOHIT AGARWAL
EC 7TH SEM

3. INDEX
• INTRODUCTION
• HISTORY
• REBORN
• HOW DOES MUTUAL
INDUCTION WORKS
• WORKING
• DESCRIPTION OF CKT
• CKT DIAGRAM
• HOW TO OPERATE
• WIRELESS CHARGER
ADVANTAGE
• APPLICATION
• WITRICITY CONCERN
• RANGE OF WITRICITY
• FUTURE OF WITRICITY

5. 9/25/2014 WiTricity 5

6. WHAT IS WITRICITY???

7. Nikola Tesla – The Genius
He enlighten 200 lamps at
the distance of 40 km,
Wirelessly !
7

8. The forgotten invention is
reborn in 2007
The idea of wireless
electricity has been
around since the early
days of the Tesla coil.
But thanks to a group
of MIT scientists, team
led by Marin Soljačić
and named it
"WiTricity"
9/25/2014 WiTricity

9. • Short range: Inductive
Coupling 1
• Medium range:
Resonant Induction 2
• Long range:
Electromagnetic Wave
Power Transfer
3

10. INDUCTANCE???
• INDUCTANCE IS THE PROPERTY OF THE
CONDUCTION, IN WHICH THE CURRENT
FLOWING IN A CONDUCTOR INDUCES A VOLTAGE
OR ELECTROMOTIVE FORCE IN IT OR ANOTHER
NEARBY CONDUCTOR.
• TYPES-
1. SELF INDUCTANCE:
IT IS THE PHENOMENA IN WHICH THE CURRENT
IS PASSING IN CONDUCTOR, AN EMF IS
INTRODUCED IN SAME COIL.

11. INDUCTANCE???
2. MUTUAL INDUCTANCE:
“Mutual inductance” is the phenomena in
which, when a current carrying conductor is
placed near another conductor, voltage is induced
in near by conductor. This is because, as the
current is flowing in the conductor, a magnetic
flux is induced in it. This induced magnetic flux
links with another conductor. Thus this flux
induces voltage in the second conductor.

13. 9/25/2014 WiTricity 13

14. DESCRIPTION OF CKT
• Wireless battery charger circuit design is very simple and easy. These
circuits require only resistors, capacitors, diodes, Voltage regulator,
copper coils and Transformer.
• In our Wireless battery charger, we use two circuits. The first circuit is
used to produce voltage wirelessly. Initially, transformer is used to step
down the voltage from 230 V to 12V. This step-down voltage is applied
to the diode. The 1N4007 diode is used to allow the voltage to flow in
one direction only. This is then passed to the 7812 voltage regulator. The
output of this regulator is a 12V DC voltage. Two capacitors are placed
before and after the voltage regulator to eliminate the ripples. Next it is
connected to the oscillator circuit. It produces a frequency of 10 MHz.
The values of resistors and capacitors are calculated in such a way that it
produces oscillations of 10MHz. Then it is fed to the inductor. Inductor
is used to induce the voltage in the second circuit.

15. DESCRIPTION OF CKT
• In the second circuit, another inductor is used
for the mutual inductance. A voltage multiplier
circuit is used after the inductor. It is then
connected to the voltage regulator 7805.7805
and 7812 are family of 78XX integrated circuit.
It produces fixed voltage at the output. 78
represents series and XX represents the output
voltage. At the output of the regulator a
capacitor is connected. Thus output is
connected to the battery

16. CIRCUIT DIAGRAM

17. How to Operate???
 Initially, connect the circuit as shown in the
circuit diagram.
Now connect Ac voltage to the transformer.
Switch on the supply.
Connect the battery charger at the output of the
circuit.
Make sure that AC and DC sources should not
have common connections.
You can observe the battery charging at the
output

18. Advantages
• Getting rid of great
deal of cables !
• More secure, no risk
of getting shocked.
• Places where you can
not have physical
cable, solution
WiTricity

19. APPLICATIONS
• Consumer electronics
• Transportation
• Industry applications
• Other applications
– Medical devices
– Military applications
– Robots
WiTricity

20. WITRICITY CONCERNS
Will it harm me?
Will it harm the environment?
Will it interfere with important
communication?
NO
WiTricity

21. Range Of WiTricity
• WiTricity can perform electric transmission 2
cm to 3-4 meters.
• Scientists are working on extending this
range
• Regarding efficiency –
With development done by MIT-IBM
efficiency raised to around %90 - %95

22. LIMITATIONS
• Power is somewhat wasted due to mutual
induction.
• It will work for very short distances only. If
you want to use it for long distances, then
the number of inductor turns should be high.
WiTricity

23. Future of WiTricity
Think that the city will be
covered with WiTricity hot spots
, just like Wireless Internet,
there will be no need of charging
batteries, or carrying adapters
all around !
If we apply this idea to the whole city, we might not have to use any wired
cable. Moreover, in the future, it would save the material cost, and
“ W E C A N S A V E T H E W O R L D , Y E A H ! ! ! ”

24. ANY QUERIES ?