Wireless mobile charging works through electromagnetic induction between coils. There are three main types: resonance charging uses coils tuned to the same frequency, inductive charging also uses induction between coils placed in devices, and radio charging transmits power via radio waves to antennas. Wireless charging eliminates wired chargers, but has disadvantages like slower charging and potential health effects from radiation. Applications include contactless payment systems, in-vehicle charging, and powering devices remotely via radio waves. In conclusion, wireless power could allow charging anywhere without wires.

1. PRESENTATION ON
WIRELESS MOBILE CHARGING
Presented By
M Beeraiah
19AG1A0426

2. INTRODUCTION
• In wireless charging the current coming from the wall power outlet moves
through the wire in the wireless charger, creating a magnetic field. The
magnetic field creates a current in the coil inside the device. This coil is
connected to the battery and the current charges the battery. The two
induction coils in proximity combine to form an electrical transformer.

3. WORKING OF WIRELESS CHARGING SYSTEM
• It works on the principle of Electromagnetic Induction.

4. Methods of Wireless Charging
There are three types of wireless charging :-
• Resonance Charging
• Inductive Charging
• Radio Charging

5. •
•
•
•
Resonance Charging :
It uses phenomenon of “RESONANCE”, that causes an object
to vibrate when energy of certain frequency is applied.
Two copper coils are used one attached to transmitter &
another to receiver.
Both coils are tuned to same electromagnetic frequency.

6. Examples:
• Electric cars
• Robots
• Vacuum Cleaners
• Laptop computers

7. •
•
Inductive Charging:
Inductive charging is one kind of short distance wireless charging.
This method works on the principle of
“ELECTROMAGNETIC INDUCTION” where the charger device
will create an E.M field with alternating polarity using a coil of
insulated copper wire & a similar coil will be placed inside the
mobile device which will convert E.M field back to electric current
there by charging the battery.

8. Examples :
• MP3 players.
• Personal Digital Assistants (PDA’s).
• Electric toothbrushes.
• Waterproof Vibrating Razors.

9. Radio Charging :
• This method is on the basis that Radio Waves are widely in use to
transmit and receive cellular telephone, television, radio and Wi-Fi.
•
A Radio wave once transmitted, propagates in all directions until it
reaches an antenna tuned to proper frequency to receive it.

10. Examples :
• Hearing aids.
• Medical implants.
• Cell phones.
• Wireless keyboards

11. Block Diagram of Wireless charging System

12. NEED OF WIRELESS CHARGING
• To make the recharging of the mobile phones independent of
their manufacturer and battery make.
• 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.
• The microwave signal is transmitted from the transmitter along
with the message signal using special kind of antennas called
slotted wave guide antenna at a frequency is 2.45 GHz.

13. Advantages of Wireless Charging
• The need of different types of chargers by different
manufacturers is totally eliminated
• Lower risk of ELECTRICAL SHOCK or shorting.
• Convenience
• Wireless energy transfer can potentially recharge the mobile
phones without chords.

14. Disadvantages of Wireless Charging
• The transmitter and receiver also should be very powerful
devices as the distance increases.
• Slower Charging.
• Wireless transmission of the energy causes some drastic
effects to human body, because of its radiation.
• Practical possibilities are not yet applicable as there is no much
advancement in this field.

15. APPLICATIONS OF WIRELESS CHARGING

16. Applications:
• Inductive Coupling-RFID.
• In-Vehicle Charging.
• Radio Charging.
• Ultra Wideband.

17. Conclusion
• A novel method of using the power of the microwave to charge
the mobile phones without the use of wired chargers.
• This method provides great advantage to the mobile phone
users to carry their phones anywhere even if the place is devoid
of facilities for charging.