Wireless charger is the technology to charge electronic devices with out any wires. This technology works under the principle of ELECTROMAGNETIC INDUCTION

1. WIRELESS CHARGING
BY G.MEGHANA
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2. INTRODUCTION:
WIRELESS CHARGING is the technology to charge Electronic devices
without connecting wires.Here you don’t need to fiddle with cables
compared with Wired charging .It is quite Relaxing for the people who are
struck with the usage of Wire charging.
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3. WORKING PRINCIPLE:
The Working principle of Wireless charging is ELECTROMAGNETIC
INDUCTION.
ELECTROMAGNETIC INDUCTION:
Electromagnetic or magnetic induction is the production of Electromotive
force(EMF) across an electric conductor in a changing magnetic field.
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4. By moving the bar magnet through the coil magnetic flux is
developed.Due to this change in flux some current is induced in the
coil.This current in the coil is called Induced current.
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5. TYPES OF WIRELESS CHARGING:
There are 3 types of wireless charging.They are:
➢ Resonance charging
➢ Inductive charging
➢ Radio charging
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6. RESONANCE CHARGING:
● It uses phenomenon of RESONANCE that causes a 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 when placed close to another power is transferred.
EXAMPLES:
Electric cars, vacuum cleaners
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7. INDUCTIVE CHARGING:
● It is used for short distance wireless charging.
● Electromagnetic induction where the charger device will create an EM
field with alternating polarity using a coil of insulated copper wire
● And a similar coil will be placed inside the mobile device which will
convert EM field back to electric current there by charging the battery
EXAMPLES:
MP3 players,electric tools etc.
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8. RADIO CHARGING:
A transmitter plugged in to a socket,generates radio waves when the
receiver attached to the devices is set to the same frequency as the
transmitter,it will charge the device battery.
EXAMPLES:
Watches,wireless keyboards,cell phones.
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9. WORKING:
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10. ● The charging device has a coil called TRANSMITTER COIL and the
coil in the mobile phone or any electronic gadget that is to be charge
is called RECEIVER COIL.
● The circuit in the Transmitter is called TRANSMITTER CIRCUIT and
the circuit in the Receiver is called RECEIVER CIRCUIT.
● When the charging device is connect to power supply ,mains voltage
is converted into high frequency Alternating current(AC).
● This Alternating current is sent to the Transmitting coil through the
Transmitting circuit.
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11. ❏ When there is a Change in magnetic flux then there is an induced
current in the Receiver coil.
❏ Current flowing within the Receiver coil is converted into Direct
current(DC) by the Receiver circuit.
❏ Thus we can charge the device without using any cables.
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12. APPLICATIONS:
❖ Low power applications are generally supportive of smaller consumer
electronic devices such as Cell phones,some computers which
normally charge at power levels below 100 watts.
❖ High power applications are generally used in Electric vehicles which
has a charging power levels of above 1 kilowatt.
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13. ADVANTAGES:
● Less risk of Electrical faults.
● Increased convenience -No need for cables.
● Inductive charging of electric vehicles at high power levels enables
charging of electric vehicles while in motion (also called DYNAMIC
CHARGING).
● It can operated automatically without dependence on people to plug
and unplug.This results in higher Reliability.
● Less wear and tear on the socket of the device and the attaching
cable.
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14. DISADVANTAGES:
● Due to the lower efficiency,device takes 15% longer to charge when
supplied power is same amount.
● It is more Expensive than wire charging.
● In Wire charging we can move our phone to use but in Wireless
charging we cannot move our phone because it is applicable only for
short distance between charging device and Electronic device.
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15. THANK YOU
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