Wireless charging allows devices to charge without cables or adapters by using electromagnetic induction. It works by passing an electrical current through a transmitting coil, generating an electromagnetic field that induces a current in a receiving coil in the device. There are three main types of wireless charging: resonant charging uses two coils tuned to the same frequency; inductive charging works through electromagnetic induction; and radio charging transmits power via radio waves. Wireless charging is convenient but slower than wired charging, and not all devices currently support it. It has applications for charging phones, laptops, electric vehicles, and other electronic devices.

1. SREE DATTHA GROUP OF INSTITUTIONS
Sheriguda (v),ibrahimpatnam(M),Telangana ,501510
DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING
SEMINAR ON
WIRELESS CHARGING SYSTEM
Presented by
N. Saikiran
(209P1A0406)

2. ❖Content
➢ What is wireless charging ?
➢ components of wireless charging
▪ Transmitter
▪ Receiver
▪ Rectenna
➢ How it works ?
➢ Methods of charging
▪ Resonance
▪ Inductive
▪ Radio
➢ Applications
➢ Advantages
➢ Disadvantages
➢ Conclusion

3. ❖ What is wireless charging?
➢ Wireles charging is one of the several methods of charging batteries without the use of
cable or device specific AC adaptors.
➢ Wireless charging can be used for a wide variety of devices including cell phones laptop
computers and MP3 players as well as larger objects such as robots and electric cars.
➢ Wireless charging is the transfer of power from a power outlet to your
device, without the need for a connecting cable.
➢ Wireless charging uses electromagnetic fields to safely transfer power from a
transmitting source to a receving device for the purposes of charging a battery.

4. ❖Components of wireless charging
▪ Transmitter
▪ Receiver
▪ Rectenna
➢ Transmitter :
✓ A transmitter is an electronic device which produces radio waves
with the help of an anteena most transmitters are used for radio
communication of information over a certain distance .
✓ A power transmitter acts as a power source.
✓ It will transmit power to the receiver side .
✓ The transmission signals are mainly in between the RF/microwave
range.(Typically 900MHZ)

5. ➢ Receiver :
✓ A receiver is the device that receives the message .it can be a
computer ,workstation ,telephone handset ,television.
✓ A device that receives electrical sinals ,waves .as the part of a
telephone held to the ear ,a radio receiving set or a television
receiving set.
✓ For charging AC signal (microwave signal with a typical value of
900 MHZ) is taken and fed to a rectifier circuit to get a D.C signal.

6. ❖How it works?
➢ It works on the principle of electromagnetic induction.
➢ Wireless charging is based on inductive charging, whereby power is created by
passing an electrical current through two coils to create an electromagnetic field.
➢ When the receiving magnetic plate on the mobile device comes into contact with
the transmitter - or at least within the specified range - the magnetic field
generates an electrical current within the device.
➢ The alternating current (AC) is sent to the transmitter coil by the transmitter
circuit .the alternating current then induces a time varying magnetic filed in the
transmitter coil.
➢ Alternating current flowing with in the transmitter coil induces a magnetic field
which extends to the receiver coil (when with in a specified distance).
➢ The magnetic field generates current with in the receiver coil of the device .the
process where by energy is transmitted between the transmitter and receiver coil
is also referred to as magnetic or resonant coupling and is achieved by both coil
resonating at the same frequency .
➢ Current flowing with in the receiver coil is converted into direct current (DC) by
the receiver circuit ,which can then by used to charge the battery.

7. ❖ Types of charging:
➢ 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 and another to receiver .
✓ Both coils are tuned to same electromagnetic
frequency.
✓ These coils are placed close to one another
power is transferred.
➢ 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. ➢ Radio charging .
✓ This method is on the basis that radio waves are widely in use of
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.
✓ A transmitter plugged in to a socket ,generates radio waves ,when
the receiver attached to the device is set to the same frequency
as the transmitter ,it will charge the devices battery.

9. ❖ Applications:
➢ Electric cars.
➢ Laptops.
➢ Mobiles.
➢ Robots.
➢ Home appliances
➢ Watches.

10. ➢A safe way to transfer power to your phone.
➢We can save time for charging mobiles.
➢Puts less strain on the charging port of your phone.
.
➢Wastage of power is less.
➢Charging of mobile phone is done wirelessly.
.
❖Advantages of wireless charging?

11. ➢Wireless charging is usually slower than wired - plugging
into a wall outlet will be much quicker for a lot of devices,
particularly via USB-C.
➢If you've got your phone charging via a cable, you can still
hold it and use it as normal. If you take your phone off a
wireless charging pad to use it, it stops charging.
➢Not all phones have it.
❖Disadvantages of wireless charging?

12. ❖Conclusions :
➢ Thus we understand the concepts of wireless charging .how this concept Is
useful to us ,and the types of wireless charging,its components. tcharging
will one day become a simple matter of dropping devices into the nearest
charging pad.

13. Thank you …