WIRELESS MOBILE CHARGER OR WIRELESS POWER TRANSFER

PRESENTED BY :-

GAUTAM SINGH ,

ELECTRICAL & ELECTRONIC ENGINEERING

RADHA RAMAN INSTITUTE OF TECHNOLOGY & SCIENCE

BHOPAL , MADHYA PRADESH , INDIA

CONTENTS

1. INTRODUCTION

2. WIRELESS CHARGING SYSTEM

3. OVERVIEW OF WIRELESS CHARGING SYSTEM

4. HOW WE CAN TRANSFER ELECTRICAL ENERGY WIRELESSLY ?

5. ELEMENT USEDS

6. WORKING PRINCIPLE

7. WHAT IS MUTUAL INDUCTANC ?

8. CIRCUTI DIAGRAM

9. HOW TO OPERATE THIS WIRELESS POWER TRANSFER CIRCUIT ?

10. TECHNICAL TRENDS

11. HIGHLIGHT OF CURRTNT ACTIVITIES

12. WIRELESS BATTERY CHARGER ADVANTAGE

13. WIRELESS POWER TRANSFER CIRCUIT APPLICATION

14. CHALLANGES

15. NEXT STEPS/ACTIONS

INTRODUCTION

THIS IS SPECIAL KIND OF CHARGING SYSTEMIN WHICH, THERE IS NO NEED OF ANY KINDOF COMMUNICATION WIRE TO CONNECTTHE POWER SUPPLY TO CHARGE IT.

FROM THIS CIRCUIT WE CAN CHARGEMOBILE OR OTHER DEVICE WIRELESSLY IN ASHORT RANGE OF DISTANCE.

WIRELESS CHARGING SYSTEMTransfer electric power to mobile nearby devices (less than several meters) and charge batteries

OVERVIEW OF WIRELESS CHARGING SYSTEM

Wireless Charging SystemHow to transfer power and charge efficientlyDevices which have a battery

Wireless Power Transfer SystemHow to transfer power efficientlyAll electric devices

Difference from cable chargersElimination of complicated wire cablesSafety from electric shockIncreased mobilityRelatively low efficiency (about 90% efficiencyof cable chargers)

Considered frequency bands20~60 kHz80~370 kHz6.78~13.56 MHz

HOW WE CAN TRANSFER ELECTRICAL ENERGY WIRELESSLY ?

BY THE HELP OF INDUCTION PROCESS.

BY THE HELP OF MICROWAVE.

BY THE HELP OF LEASER.

ELEMENT USED

RECEIVER CIRCUIT 1.DIODE 1N40072.RESISTANCE 1K OHM3.LIGHT EMITTING DIODE4.CAPACITOR 220 MICRO FARAD 40 VOLT5.REGULATED INTEGRATED CIRCUIT L7805CV

TRANSMITTER CIRCUIT1.DIODE 1N40072.DIODE 1N41483.RESISTANCE 1K OHM4.RESISTANCE 10K OHM5.N-CHANNEL MOSFET IRF5406.INDUCTOR 10MICRO HeNRY7.CAPACITOR 220 MICRO FRAD 40 VOLT8.REGULATED INTEGRATED CIRCUIT L7824CV9.LIGHT EMITTING DIODE

WORKING PRINCIPLE

This circuit mainly works on theprinciple of mutual inductance. Poweris transferred from transmitter toreceiver wirelessly based on theprinciple of “inductive coupling”.

“Mutual inductance” is the phenomena in which,when a current carrying conductor is placed nearanother conductor voltage is induced in thatconductor. This is because, as the current is flowing inthe conductor, a magnetic flux is induced in it. Thisinduced magnetic flux links with another conductorand this flux induces voltage in the secondconductor. Thus two conductors are said to beinductively coupled.

WHAT IS MUTUAL INDUCTANC?

CIRCUTI DIAGRAM

HOW TO OPERATE THIS WIRELESS POWERTRANSFER CIRCUIT ?

Initially, connect the circuit as shown in the circuit diagram.

Switch on the supply.

Connect the battery charger at the output of the circuit.

Place the receiver coil near the transmitter coil .

You can observe the charging of battery.

TECHNICAL TRENDS

WiTricity-Haire

WiTricity, a spin-off company from MIT

Power transfer to Full HD TV in CES

2010

Intel

12W power transfer to netbook in 3feet

Receiver coils in the cover of netbook

Independent standardization activity on

100W wireless power transfer

Sony

Power transfer to 22 LCD TV 60W

Efficiency: about 80% @ 50cm

Charging distance increases by

repeaters

Qualcomm

Announcement of eZone, a wireless

power transfer system, in CES2009

Maximum supportable devices: 2

Maximum charging distance: 0.2m

Qualcomm-WiPower

Takeover WiPower in 2010 for

developing a wireless power transfer

system

Developing power transfer system in

vehicles

Charging distance: 0.05m

Fujitsu

Simultaneous charging to two

mobile phones in Sep. 2010

Development of a simulator which is

used for analysis of magnetic fields

between multiple coils

HIGHLIGHT OF CURRTNT ACTIVITIESTTA PG 709 (Wireless Charging and Application)

Established in Mar. 2011Scope:

Standard roadmapPower transfer interfaceControl mechanism

12 members

- Service & Structure -Evaluation-Interface

TTA PG709

Steering Committee

WG 1 WG 2 WG 3

WIRELESS BATTERY CHARGER ADVANTAGE

Usage of separate charger is eliminated.

Phone can be charged anywhere and anytime.

It does not require wire for charging.

Easier than plug into power cable.

WIRELESS POWER TRANSFER CIRCUIT APPLICATION

Wireless chargers can be used to charge mobiles, camerabatteries, Bluetooth headsets etc.

This can also be used in applications like car batterycharger with little modification.

This can also be used in medical devices.

CHALLANGESProduct Diversification

As market is increasing, each vendor makes the WirelessCharging system which has different structure & protocol.

Wireless Charging is possible only between systemshaving the same structure & protocol.

Frequency IssuesEach vendor considers different frequency bands forWireless Charging which disables interoperabilitybetween Wireless Charging systems

Regulation IssuesEach nation has different regulation for EMI/EMC, SAR, etc.

Standardization Activities for product diversification

System & interface

Control & management protocol

Conformance test & certification

Regulation Coordination & CompromiseFrequency bandEMI/EMCSAR

Activities toward the global harmonizationCooperation with other SDOs

Investigation of the similar activities and directions in other organizations

NEXT STEPS/ACTIONS

REFERENCE1. MIT BOSTON, U.S.A2. TSHINGHUA UNIVERSITY , CHINA3. ELECTRONIC DEVICE & CIRCUIT, BOYLSTED4. CIRCUIT THEORY, ALEXANDER & SADIKU5. SAMSUNG, INTEL, LG ,SONY6. WIKIPEDIA7. ENCYCLOPEDIA8. YOUTUBE9. ELECTRONICHUB.COM

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