WIRELESS CHARGING
Submitted by
Athira Joy
INDEX
• Introduction
• What is wireless charging
• Components of wireless charging
• Working of wireless charging
• Methods of wireless charging
• Wireless charging standard
• Other wireless charging standards
• Advantages
• Disadvantages
• Future scope and applications
• Conclusions
INTRODUCTION
• Wireless charging uses an electromagnetic field to transfer energy
between two objects.
• This is usually done with a charging station.
• Energy is sent through an inductive coupling to an electrical device,
Which can then use that energy to charge batteries or run the device.
WHAT IS WIRELESS CHARGING ?
• Wireless charging (wireless power transfer)uses electromagnetic fields to
safely transfer power from a transmitting source to a receiving device for
the purposes of charging a battery.
COMPONENTS OF WIRELESS CHARGING
• Transmitter
• Receiver
• Rectenna
TRANSMITTER
• A transmitter is an electronic device which produces radiowaves with the
help of an antenna.Most transmitters are used for radio communication
of information over a certain distance.
Universal QI wireless
Charging transmitter
RECEIVER
• A device or apparatus that receives electrical signals,waves or the like
and renders them perceptible to the senses.As part of a telephone held to
the ear,a radio receiving set or a television receiving set.
Android QI wireless
charging receiver
RECTENNA
• A rectenna is a rectifying antenna-a special type of antenna that is used
to convert electromagnetic energy into direct current (DC)
electricity.They are used wireless power transmission system that
transmit power by radiowaves.
• Rectenna=Rectification of
antenna
WORKING OF WIRELESS CHARGING
• Mains voltage is converted into high frequency alternating current (AC).
• The alternating current (AC) is sent to the transmitter coil by the transmitter
circuit.The alternating current then induces a time varying magnetic field in the
transmitter coil.
• Alternating current flowing within the transmitter coil induces a magnetic field which
extends to the receiver coil.
• The magnetic field generates current within the receiver coil of the device.The process
whereby energy is transmitted between the transmitter and receiver coil is also
referred to as magnetic or resonant coupling and is achieved by both coils resonating
at the same frequency.
• Current flowing within the receiver coil is converted into direct current (DC) by the
receiver circuit, which can then be used to charge the battery.
METHODS OF WIRELESS CHARGING
• Inductive charging
• Resonance charging
• Radio charging
INDUCTIVE CHARGING
• Inductive charging is kind of short distance wireless charging.
• Inductive charging uses an electromagnetic field to transfer energy
between two objects through electromagnetic induction.
EXAMPLES
Inductive charging is used for charging MID sized items such as:
• Cell phones
• MP3 players
• Electric toothbrush
• Smart watches
RESONANCE CHARGING
• Resonance charging is used for items that require large amounts of
power.
• In resonance charging,a copper coil attached to a power source is the
sending unit.Another coil, attached to the device to be charged is the
receiver.
• This method works over short distances.
EXAMPLES
• Electric car
• Robot
• Vaccum cleaner
• Laptop
RADIO CHARGING
• Radio charging is used for charging items with small batteries and low
power requirement devices.
• A transmitter plugged into 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.
• Radio charging is used for long range.
EXAMPLES
• Watches
• Medical implants
• Cell phones
• MP3 players
• Wireless keyboard
• Wireless mouse
WIRELESS CHARGING STANDARD
• QI sets guidelines for the inductive charging units.
• Open interface standard developed by the wireless power consortium.
• In2016 there were 140 devices which can be charged wirelessly with QI.
OTHER WIRELESS CHARGING STANDARDS
ADVANTAGES
• Use of separate chargers are eliminated.
• Consumes less electricity
• Phone can be charged anywhere.
• Saves the time for charging
• Convenient and simple to
• Safer for medical devices
DISADVANTAGES
• Lower efficiency emits heat
• More costly: due to use of coils in both devices
• Slower charging:due to lower efficiency
• Inconvenience: because while charging Mobile must be left on the
charging pad , mobile can’t be operated easily.
• Radiation problems also may occur.
FUTURE SCOPES AND APPLICATIONS
• Automatic wireless charging for all commercial vehicle,in garages and
at remote kiosks.
• Direct wireless communication in harsh environment where it is
impossible to run wires.
• Applications
• Mobile charging – available on Nokia Lumia (820,920),LG Nexus
4,samsung Galaxy S4,Axis Nexus 7,LG Nexus 5,Sony Xperia etc......
• Laptop Charging- Intel and Samsung plan to launch QI inductive
charging devices for laptops in 2014.
• Electric devices
CONCLUSION
• Research in to using wireless technology to supply to terminals is finally
beginning to be realised.The technology provides a wide range of other
obvious benefits, including better portability, lower cost and best of all
the end of having to guess which charges go what gadgets.Charging will
one day become a simple matter of dropping devices into the nearest
charging pad.
