SUBMITTED TO: Dr. Deepak Demla(head of department)

Submitted by: Ankit Gupta(BCA 1st year)

SEMINAR PRESENTATIONON

WIRELESS CHARGING TECHNOLOGY

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

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.

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.

COMPONENTS OF WIRELESS CHARGING

• TRANSMITTER

• RECEIVER RECTENNA

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.

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.

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

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.

BLOCK DIAGRAM OF WIRELESS CHARGING

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.

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

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 (3-5 METERS).

EXAMPLES

• ELECTRIC CAR

• ROBOT

• VACUUM 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 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 .

OTHER STANDARDS

APPLICATIONS

• WIRELESS CHARGING PAD FOR MOBILE AND OTHER DEVICES

SOME OTHER APPLICATIONS ARE

• INDUCTIVE COUPLING • IN VEHICLE CHARGING • RADIO CHARGING• WIRELESS IMPLANTABLE MEDICAL DEVICES• ULTRA WIDEBAND

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.

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.

• 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.

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.

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.

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 available.

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.

COTA TILE

RECEIVER

TRANSMITTER

COTA DEVICES

COTA AA BATTERY

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.

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-CO

TA-TILE-CLOUD-CES-2017/

THANK YOU