Debasis Mohanty gave a presentation on wireless charging. Wireless charging uses electromagnetic induction to transfer power through induction coils, allowing devices to charge without being plugged in. There are three main types of wireless charging: resonance, inductive, and radio frequency. Wireless charging works through an oscillator circuit that creates a magnetic field between transmitter and receiver coils to charge a device's battery. While convenient, wireless charging is currently slower and more expensive than wired charging. Potential applications include charging pads for mobile devices and electric vehicles.

1. PRESENTATION
ON
WIRELESS CHARGING
BY BY: DEBASIS MOHANTY
REG NO.-14020081
BRANCH -ELECTRICAL

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 ( Ex-Electric Cars, Robots,
Vacuum Cleaners, Laptops and other high power
devices.)
• Inductive Charging ( Ex-MP3 Players, PDAs and other
mid-sized items.)
• Radio Charging ( Ex-Watches,Hearing Aids,Wireless
Keyboards,Medical Implants and other low power
devices.)

5. Block Diagram of Wireless charging System

7. Oscillator Circuit Diagram

8. Formulas
=> The operating frequency of the oscillator is
F = ½ × π × √ (LC)
⇒The equation for finding the inductance of a
single layer air core coil is
L = 0.001 N^2 (a/2)^2 / (114a + 254l) H
where , a = Diameter of coil in meters
l = Length of the coil in meters
N = Total no. of turns

10. 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.

11. 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.

12. 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.
More costly.
Practical possibilities are not yet applicable as there is no much
advancement in this field.

13. APPLICATIONS OF WIRELESS CHARGING

14. • Wireless Charging Pad for mobile devices.

15. • In the car: As demonstrated by Fulton Innovation at CES
2011, we may also begin seeing electric-powered vehicles get
powered up via a manhole-sized charging pad.

16. 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.

17. References
• GOOGLE
• Power Electronics Course Book by P.S Bimbhra