PRESENTATIONON

WIRELESS CHARGING

MANOJ KUMAR

SID:13207008 ME ELECTRONICS

INTRODUCTION

• 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.

WORKING OF WIRELESS CHARGING SYSTEM

• It works on the principle of Electromagnetic Induction.

• Induction chargers typically use an induction coil to create an alternating

electromagnetic field from within a charging base station, and a second

induction coil in the portable device takes power from the electromagnetic

field and converts it back into electrical current to charge the battery.

Methods of Wireless Charging

There are three types of wireless charging :-

• Resonance Charging

• Inductive Charging

• Radio Charging

Resonance Charging :

• 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.

Examples:-• Electric cars

• Robots

• Vacuum Cleaners

• Laptop computers &

Other items that require large amounts of power.

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.

Examples:-• MP3 players.

• Personal Digital Assistants (PDA’s).

• Electric toothbrushes.

• Waterproof Vibrating Razors. & Other mid-sized items.

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

Examples:-

• Watches.

• Hearing aids.

• Medical implants.

• Cell phones.

• Wireless keyboards & Other charging devices with small batteries and low power requirements.

Block Diagram of Wireless charging System

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.

Advantages of Wireless Charging

The need of different types of chargers by different

manufacturers is totally eliminated

Lower risk of ELECTRICAL SHOCK or shorting.

Convenience

Wireless energy transfer can potentially recharge the mobile

phones without chords.

Disadvantages of Wireless Charging

The transmitter and receiver also should be very powerful

devices as the distance increases.

Slower Charging.

Wireless transmission of the energy causes some drastic effects

to human body, because of its radiation.

More costly.

Practical possibilities are not yet applicable as there is no much

advancement in this field.

APPLICATIONS OF WIRELESS CHARGING

• Wireless Charging Pad for mobile devices.

• In the car: As demonstrated by Fulton Innovation at CES 2011, we may also begin seeing electric-powered vehicles get

powered up via a manhole-sized charging pad.

Other Applications:

• Inductive Coupling-RFID.

• In-Vehicle Charging.

• Radio Charging.

• Ultra Wideband.

WIRELESS CHARGING STANDARDS

• Qi is a set of guidelines for inductive charging units. Right

now it is a default standard.

• It's rounded up 84 manufacturers, semiconductors, and telecom

providers under its wing so far, a number which no other

organizations have come close to matching.

Other Standards :

COMPANIES IN WIRELESS CHARGING TECHNOLOGY

WIRELESS CHARGING MARKET OUTLOOK

WIRELESS CHARGING MARKET

Current Players in the Wireless Charging

• DELL- Dell has started giving the option of having wireless chargers in

there customization option to the customers.

• Palm Inc- This smart phone company announced in 2009 to launch touch

stone models of phones with wireless charger as its standard accessory.

• Hughes Electronics- This Company in collaboration with General motors

introduced a battery operated car with the option of recharging it wireless.

The car is named General Motors EV1 electric car.

• Evatran Company- A subsidiary of MTC Transformers

began development of ‘plug less power’ in 2009. This is based

on inductive charging system which will power electric car

through wireless recharging technology.

• Toshiba- They released a wireless powered television which

was first in the world to have a powering mechanism of that

kind

• Wireless Power Consortium- An alliance of 20 firms had formed this

group to device open source standard for wireless charging technology.

Some bug tickets include Philips, Sanyo, Nokia, Texas Instruments,

research in Motion, Duracell, and Energizer etc.Their draft version is ready

as of July 2010. Some companies like Samsung electronics and Ericson are

associates of this group who will contribute standards to be part of this

alliance.

• IAV GmbH-This German Company is working on chargers which can be

implemented in the road which would allow the car to be charged as it

runs along the road surface.

Technologies in wireless charging

Wireless Charging System Scenarios

Wireless Charging Solutions

Wireless Charging for Consumers

Wireless Charging Market

Wireless charging products

Conclusion

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.

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.

References

• www.wikipedia.com

• www.Howdostuffwork.com

• www.WhatIs.com

• www.google.com

• www.1000projects.com

• www.ieee.com

• www.chetanasprojects.com