Here you will learn about the wireless charging technology and the latest charge over the air technology.

1. SUBMITTED TO: Dr. Deepak Demla
(head of department)
Submitted by: Ankit Gupta
(BCA 1st year)
SEMINAR PRESENTATION
ON
WIRELESS CHARGING TECHNOLOGY

2. CONTENT
• INTRODUCTION
• WHAT IS WIRELESS CHARGING
• COMPONENTS OF WIRELESS CHARGING
• WORKING
• METHODS
• CHARGING STANDARDS
• APPLICATIONS
• ADVANTAGES
• DISADVANTAGES
• COTA (ADVANCE TECH)
• FEATURES
• HOW IT WORK
• COTA CLOUD
• COTA DEVICES
• FUTURE SCOPE
• REFERENCES

3. INTRODUCTION
• WIRELESS CHARGING PROVIDES A CONVENIENT, SAFE,
AND RELIABLE WAY TO CHARGE AND POWER MILLIONS
OF ELECTRICAL DEVICES AT HOME, IN THE WORKPLACE
AND IN INDUSTRY.
• BY ELIMINATING THE USE OF PHYSICAL CONNECTORS
AND CABLES, WIRELESS CHARGING PROVIDES A
NUMBER OF EFFICIENCY, COST AND SAFETY
ADVANTAGES OVER THE TRADITIONAL CHARGING CABLE.

4. 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 (OR
RECHARGING) A BATTERY.

5. COMPONENTS OF WIRELESS CHARGING
• TRANSMITTER
• RECEIVER
RECTENNA

6. TRANSMITTER
• A TRANSMITTER IS AN ELECTRONIC DEVICE WHICH
PRODUCES RADIO WAVES WITH THE HELP OF AN
ANTENNA. MOST TRANSMITTERS ARE USED FOR RADIO
COMMUNICATION OF INFORMATION OVER A CERTAIN
DISTANCE.

7. RECEIVER
• A DEVICE OR APPARATUS THAT RECEIVES ELECTRICAL SIGNALS,
WAVES, OR THE LIKE, AND RENDERS THEM PERCEPTIBLE TO THE
SENSES, AS THE PART OF A TELEPHONE HELD TO THE EAR, A
RADIO RECEIVING SET, OR A TELEVISION RECEIVING SET.

8. 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 IN WIRELESS
POWER TRANSMISSION SYSTEMS THAT TRANSMIT POWER
BY RADIO WAVES.
• RECTENNA= RECTIFICATION + ANTENNA

9. 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
(WHEN WITHIN A SPECIFIED DISTANCE).
• 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.

10. BLOCK DIAGRAM OF WIRELESS
CHARGING

11. METHODS OF WIRELESS
CHARGING
• INDUCTIVE CHARGING
• RESONANCE CHARGING
• RADIO CHARGING

12. 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.
• ENERGY IS SENT THROUGH AN INDUCTIVE COUPLING TO AN
ELECTRICAL DEVICE, WHICH CAN THEN USE THAT ENERGY
TO CHARGE BATTERIES OR RUN THE DEVICE.

13. EXAMPLES
• INDUCTIVE CHARGING IS USED FOR CHARGING MID-SIZED ITEMS SUCH AS :
• CELL PHONES
• MP3 PLAYERS
• ELECTRIC TOOTHBRUSH
• SMART WATCHES

14. 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 (3-5 METERS).

15. EXAMPLES
• ELECTRIC CAR
• ROBOT
• VACUUM CLEANER
• LAPTOP

16. 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.

17. EXAMPLES
• WATCHES
• MEDICAL IMPLANTS
• CELL PHONES
• MP3 PLAYERS
• WIRELESS KEYBOARD
• WIRELESS MOUSE

18. WIRELESS CHARGING
STANDARD
• QI SETS THE GUIDELINES FOR
THE INDUCTIVE CHARGING UNITS .
• OPEN INTERFACE STANDARD DEVELOPED
BY THE WIRELESS POWER CONSORTIUM .
• IN 2016 THERE WERE OVER 140 DEVICES
WHICH CAN BE CHARGED WIRELESSLY WITH QI .

19. OTHER STANDARDS

20. APPLICATIONS
• WIRELESS CHARGING PAD FOR MOBILE AND OTHER
DEVICES

21. SOME OTHER APPLICATIONS ARE
• INDUCTIVE COUPLING
• IN VEHICLE CHARGING
• RADIO CHARGING
• WIRELESS IMPLANTABLE MEDICAL DEVICES
• ULTRA WIDEBAND

22. ADVANTAGES
• USE OF SEPARATE CHARGERS ARE ELIMINATED.
• CONSUMES LESS ELECTRICITY.
• PHONE CAN BE CHARGED ANYWHERE.
• SAVES THE TIME FOR CHARGING.
• CONVENIENT AND SIMPLE TO USE.
• SAFER FOR MEDICAL DEVICES.

23. 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 MUST BE LEFT ON THE CHARGING
PAD, MOBILE CAN’T BE OPERATED EASILY.
• RADIATION PROBLEMS ALSO MAY OCCUR.

24. • CHARGE OVER THE AIR
• IT WAS DEVELOPED BY OSSIA.
• TECHNOLOGY BUILT ON THE PRINCIPLES AND
FREQUENCIES AS WI-FI.
• COTA WAS ANNOUNCED ON SEPTEMBER 9, 2013.
• RATED AMONG THE TOP 10 TECHNOLOGY IN
CONSUMERS ELECTRONIC SHOW 2017 HELD IN LAS
VEGAS.

25. FEATURES
• COTA DETECT THE POSITION OF A POWER RECEIVER AND
CHARGES THE DEVICE.
• ENABLING UP TO 1 WATT OF POWER TO BE TRANSMITTED
WIRELESSLY.
• ITS RANGE IS ABOUT 30 FEET.
• AN IMPROVEMENT OVER INDUCTIVE WIRELESS
STANDARDS SUCH AS QI.
• APPROX 32 DEVICES CAN BE CHARGED SIMULTANEOUSLY.

26. HOW IT WORKS (MULTIPLE
DEVICES)The charger
establishes the
signal shape from
each device and
replays the signal
to power the
devices from
memory.
The charger will
also refresh the
signal shape for
each device
multiple times a
second to be able
to follow moving
devices.

27. COTA WIRELESS REMOTE POWER
IS …
A home full of power: A
single charger powers any
Cota-enabled device within a
30-foot radius.
Safe/efficient: Naturally safe
technology inherently avoids
living objects; a one to many
design is highly efficient.
Smart/learning: Smart
charger remembers the use
pattern of devices and tracks
devices as they leave and
return to the home/office;
ensuring that every device is
always charged and

28. COTA CLOUD
• COTA TRANSMITTERS POWER OUTPUT IS
CUSTOMIZABLE ON A PER-DEVICE BASIS.
• AN ADMINISTRATOR CAN VIEW THE POWER LEVELS OF
CONNECTED RECEIVERS.
• PRIORITIZE POWER DELIVERY FOR ONE AT THE EXPENSE
OF ANOTHER, AND DENY ACCESS ENTIRELY.

29. COTA TILE
RECEIVE
R
TRANSMITT
COTA DEVICES
COTA AA

30. FUTURE SCOPES
• 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.

31. REFERENCES
• HTTPS://EN.WIKIPEDIA.ORG/WIKI/INDUCTIVE_CHARGING
• HTTPS://WWW.VERIZONWIRELESS.COM/ARCHIVE/MOBILE-
LIVING/TECH-SMARTS/HOW-DOES-WIRELESS-CHARGING-
WORK/
• HTTPS://WWW.YOUTUBE.COM/WATCH?V=4WAQM3_LY7S
• HTTP://WWW.OSSIA.COM/COTA/
• HTTP://WWW.DIGITALTRENDS.COM/COOL-TECH/OSSIA-
COTA-TILE-CLOUD-CES-2017/

32. THANK YOU