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1. WIRELESS-CHARGER
BY
A.S.KRISHNA

2. CONTENT
 S ABSTRACT
INTRODUCTION
WIRELESS CHARGING
PROPOSAL
CONCLUSION

3. ABSTRACT
With mobile phones becoming a basic part of life, the recharging of mobile
phone batteries has always been a problem. the mobile phones vary in their
talk time and battery standby according to their manufacture and batteries.
all these phones irrespective of their manufacturer and batteries have to be
put to recharge after the battery has drained out.
The main objective of this current technology is to make the recharging of the
mobile phones independent of their manufacturer and battery make. in this
paper a new proposal has been made so as to make the recharging of the
mobile phones is done automatically as you talk in your mobile phone!

4. INTRODUCTIO
N Wireless charging (or) inductive charging is built on the principles
of wireless power provides an easier and more convenient means to
charge a range of consumer electronic and industrial devices,
providing a reliable and low maintenance system for power transfer
compared with traditional cable based contact methods.
From smartphones and small electronic devices to mission critical
equipment, wireless charging maintains safe, reliable transfer of
power to ensure all forms of device and equipment are always
charged and ready to go.

5. WIRELESS CHARGING
Wireless charging is based on the principle of inductive power transfer (ipt) or
magnetic resonance – the process of transferring energy between two objects
through coils. a time varying magnetic field is induced in the transmitter coil
by an alternating current (ac).
This sends energy from the charging base station (transmitter) to a coil in the
target device (receiver) via a process calledmagnetic coupling . specialized
circuitry on the receiver converts energy received through the magnetic
coupling into dc which can then be used to charge the battery.

6. 1) Mains voltage is converted into high frequency alternating current (ac).
2) The alternating current is sent to the transmitter coil by the transmitter circuit.
3) Alternating current flowing within the transmitter coil creates a magnetic field which
extends to the receiver coil (when within a specified distance).
4) The magnetic field generates current within the receiver coil of the device.
5) Current flowing within the receiver coil is converted into direct current (dc) by the
receiver circuit, thus charging the battery of the device.
These basic principles are applied for inductive charging of consumer devices i.e. charging
pads, as well as for large industrial wireless solutions.
This dc power can charge the battery or power a device without contact.

21. PROPOSAL
Till now we saw the wireless charging through the
induction principle by placing the two coils.
But now we are going to see the wireless charging through
the bluetooth device .
The basic addition to the mobile phone is going to be
the rectenna. a rectenna is a rectifying antenna, a special
type of antenna that is used to directly convert waves into
dc electricity.

22. Its elements are usually arranged in a mesh pattern, giving it a
distinct appearance from most antennae. a simple rectenna can be
constructed from a schottky diode placed between antenna dipoles.
There are minimal additions, which have to be made in the mobile
handsets, which are the addition of a sensor, a rectenna, and a
filter. with the above setup, the need for separate chargers for
mobile phones is eliminated and makes charging universal. thus
the more you talk, the more is your mobile phone charged! with this
proposal the manufacturers would be able to remove the talk time
and battery stand by from their phone specifications.

31. CONCLUSION
Some of the associated benefits of wireless chargers:-
Greater convenience and ubiquity for charging of everyday devices
Reduce cost associated with maintaining mechanical connectors
Safe powering or charging devices that need to remain sterile or
hermetically sealed (waterproof)
Prevent corrosion due to elements such as oxygen and water
Eliminate sparks and debris associated with wired contacts