Wireless charging works by using magnetic induction to transfer energy between two coils. When electricity flows through a charging coil, it creates a magnetic field that induces a current in a receiving coil connected to a device battery. Early experiments with wireless power transmission date back to Nikola Tesla in 1901, while more recent research by MIT in 2007 demonstrated wireless charging over distances of a few meters. Wireless charging technologies include magnetic induction, resonance charging, radio frequency and optical charging, enabling convenient charging of devices without cables.

1. PRINCIPLE OF WIRELESS
CHARGING
- VANEET SACHDEVA
- 11611228
- B46 | K1603
- LOVELY PROFESSIONAL UNIVERSITY

2. Introduction
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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.
VANEET SACHDEVA - 11611228

3. History of WIRELESS POWER
TRANSMISSION
In 1901, NikolaTesla used the
Principle of electrodynamics
induction to transfer
electromagnetic energy without
the need of wires to construct the
Wardenclyffe tower (Figure 1) to
transmit power betweenAmerica
and Europe but was destroyed by
US government in 1917.
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4. Researches Over WIRELESS
TRANSMISSION
In 2007, MIT researchers proposed the wireless power
transmission based on strong coupled magnetic
resonance and successfully lightened a 60W bulb over
2 meters with a transfer efficiency of 30%.
In 2008, Intel demonstrated an experiment setup to
lighten a 60W bulb over 1 meter with the transfer
efficiency of 70 %.
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5. What is Wireless Charging?
• Wireless 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.

6. • A magnetic field is
created around the
wire if electricity is
transmitted down a
wire
Andre Marie
Ampere
• Faraday developed the
fundamental law of
induction, a process that
enables the transfer of
power from one wire to
another using magnetic
field.
Michael
Faraday • Maxwell equation was
established, which is the
basis of several
everyday devices
including electrical
motors and generators
Maxwell
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7. FIND OUT
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10. Technologies in wireless charging

11. The technologies for wireless charging
can be magnetic induction, radio
frequency, optical or conduction.
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12. • 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.
• These coils when placed close to one another power is transferred.
• Eg: electric cars,robots,laptop&computers,vaccum cleaners
Resonance Charging :

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15. 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.
Eg:MP3 players,PDA’s,electric toothbrushes,electric vibrating razors

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18. 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.
• 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 device’s battery
• Eg: watches,medical implants,hearing aids,cell phones,wireless keyboards

23. • For optical or infrared, the laser light is focused on
photovoltaic cells that convert light energy to
power.
• Fast growing method, more efficient and
comparatively safe and easier to use.
• In conduction, the power transfer occurs due to
metallic contact between transmitter and receiver.
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Optical Charging :

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26. 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.

27. FUTURE SCOPE
 The wireless charging can even be done using the data exchange as now
only its only been implemented for voice calls.
 With the advent of nanotechnology and MEMS the size of these rectennas
can be brought down to molecular level. It has been theorized that similar
devices, scaled down to the proportions used in nanotechnology, could be
used to convert light into electricity at much greater efficiencies than what
is currently possible with solar cells. This type of device is called an
optical rectenna.

28. ADVANTAGES LIMITATIONS
•Wireless
• A number of devices can be
charged at a time
• Electrically safe
• Can be used in harsh
environments due to
encapsulation
• High power in output
• Waterproof
• Low maintenance
• Charging is convenient
•More power consumption
• Low efficiency
• Heat generation is more
than traditional charging
• Complex circuitry
• More costly
• Slow Charging
• High cost of manufacturing
• Harmful magnetic adiations
emitted
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29. APPLICATIONS
In Mobile Phones
In Cordless Phones
In Electric Car
In Laptops
In Low Power Consuming Appliances.
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30. PRODUCTS AVAILABLE IN
MARKET
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32. Conclusion
Wireless energy transmission technology has been developed in which
electrical energy is transmitted from power source to an electrical device
without using wires.
The technology has improved sustainability but still consists of various
drawbacks which need to be researched upon in order to commercialize it.
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.
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33. ThankYou 