how induction charging can be used to charge a mobile phone

2. 1. Tanuj Kumar Pandey
2. Ankit Pant
3. Himanshu Barshiliya
4. Rohit Bisht
Mr. Pankaj Bisht

3. Charging by Induction
Involves the
charging of one
object by another
without direct
contact.

4. Inductive Charging:
Induction is the production of electricity across a conductor
situated in a changing magnetic field moving or a conductor moving
through a changing magnetic field.
When a conductor is subjected through a changing magnetic field a
current is induced in the conductor and this current can be stored
or used.
The transfer of energy takes place by electromagnetic coupling
through a process known as mutual induction.
This process works only in short distances and can be used to run
electric gadgets. Like cell phones, lap tops etc.

5. Chopper circuit

6. 1. Supplied Voltage -- 220 to 440 volt ac
2. Output Voltage -- 5 to 12 volt dc
3. Induced flux is -- (30 – 60)% of generated flux
4. Bridge Rectifier -- covert AC (n.s) to DC (n.s)
5. Chopper circuit -- Increase the level of DC input
(from 5v to 12v)
Note : the ratings can be implemented after practical operation as per requirement.
n.s – not specified.

7. The Basic Principle is mutual
inductance/Electromagnetic
induction, As the ac input
is applied to the one end
of electromagnet there is
generation of ac Voltage with
lower level at the other end
Mutual inductance.
This generated EMF is AC and has low voltage therefore supplied to the
rectifier to convert this AC into DC (as per requirement) ,now by the help
of chopper we are able to vary our DC output voltage.
Note : As the process have many difficulties ratings and some changes can be made if required

8. Advantages
If wireless recharging and transmission technology is applied in a
large way, then we can do away with costly grids and substations
which provide us with power till now.
Homes and cities can be provided power wireless from a central
transmission point which will cater to the needs of the population
within its reach.
Battery operated devices will never run out of power if this
technology is implemented.
When this technology is extended to cars then we can have cars
that run non-stop with full battery charge. We will never have to go
to charging station or to any fuel station to get the tank filled. fly
nonstop with no need to refuel.

9. Disadvantages
Lower efficiency, waste heat - The main disadvantages of
inductive charging are its lower efficiency and increased resistive
heating in comparison to direct contact. Implementations using
lower frequencies or older drive technologies charge more slowly
and generate heat within most portable electronics.
More costly - Inductive charging also requires drive electronics
and coils in both device and charger, increasing the complexity and
cost of manufacturing.
Slower charging - due to the lower efficiency, devices can take
longer to charge when supplied power is equal.

10. 1. The best advantage of this technology would be we
could get rid of all the cables line which stretch the
face of our homes and cities carrying power.
2. NO need to plugging the chargers.(mob.,laptp,etc)
3. Walk when u talk, no need to plug mobile to charge.
4. Make power system cheapest and economical.

11. Conclusion :
Transmission of power without wire is not science fiction
but a reality now. Without any physical contacts we can
transmit power to any distance and run appliances which
can be controlled independently. Many companies now
have wireless chargers as part of their standard accessory.
When Nikola Tesla tried his induction coupling experiments
the efficiency was in the range of 20%, now the efficiency
has increased to 80 to 90%.

12. References
1) Wireless Electricity
http://www.fastcompany.com/magazine/132/brilliant.html
2) http://en.wikipedia.org/wiki/Inductive_charging
3) http://en.wikipedia.org/wiki/Wireless_energy_transfer
4) Time line of Technology-
http://inventors.about.com/od/timelines/a/electricity_timeline.h
tm
5) Wireless Technology
http://emergingtechnology.wordpress.com/2007/10/02/wireless-
electricity/