Welcome

WIRELESS CHARGER

BASED ON

WITRICITY

PRESENTED BY

MOHIT AGARWAL

EC 7TH SEM

INDEX

• INTRODUCTION• HISTORY• REBORN• HOW DOES MUTUAL

INDUCTION WORKS• WORKING• DESCRIPTION OF CKT• CKT DIAGRAM• HOW TO OPERATE• WIRELESS CHARGER

ADVANTAGE• APPLICATION• WITRICITY CONCERN• RANGE OF WITRICITY• FUTURE OF WITRICITY

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WHAT IS WITRICITY???

Nikola Tesla – The Genius

He enlighten 200 lamps at

the distance of 40 km,

Wirelessly !

7

The forgotten invention is

reborn in 2007

The idea of wirelesselectricity has beenaround since the earlydays of the Tesla coil.But thanks to a groupof MIT scientists, teamled by Marin Soljačićand named it"WiTricity"

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• Short range: Inductive Coupling1

• Medium range: Resonant Induction2

• Long range: Electromagnetic Wave Power Transfer

3

INDUCTANCE???

• INDUCTANCE IS THE PROPERTY OF THE CONDUCTION, IN WHICH THE CURRENT FLOWING IN A CONDUCTOR INDUCES A VOLTAGE OR ELECTROMOTIVE FORCE IN IT OR ANOTHER NEARBY CONDUCTOR.

• TYPES-

1. SELF INDUCTANCE:

IT IS THE PHENOMENA IN WHICH THE CURRENT IS PASSING IN CONDUCTOR, AN EMF IS INTRODUCED IN SAME COIL.

INDUCTANCE???

2. MUTUAL INDUCTANCE:“Mutual inductance” is the phenomena in

which, when a current carrying conductor is placed near another conductor, voltage is induced in near by conductor. This is because, as the current is flowing in the conductor, a magnetic flux is induced in it. This induced magnetic flux links with another conductor. Thus this flux induces voltage in the second conductor.

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DESCRIPTION OF CKT

• Wireless battery charger circuit design is very simple and easy. These circuits require only resistors, capacitors, diodes, Voltage regulator, copper coils and Transformer.

• In our Wireless battery charger, we use two circuits. The first circuit is used to produce voltage wirelessly. Initially, transformer is used to step down the voltage from 230 V to 12V. This step-down voltage is applied to the diode. The 1N4007 diode is used to allow the voltage to flow in one direction only. This is then passed to the 7812 voltage regulator. The output of this regulator is a 12V DC voltage. Two capacitors are placed before and after the voltage regulator to eliminate the ripples. Next it is connected to the oscillator circuit. It produces a frequency of 10 MHz.The values of resistors and capacitors are calculated in such a way that it produces oscillations of 10MHz. Then it is fed to the inductor. Inductor is used to induce the voltage in the second circuit.

DESCRIPTION OF CKT

• In the second circuit, another inductor is used for the mutual inductance. A voltage multiplier circuit is used after the inductor. It is then connected to the voltage regulator 7805.7805 and 7812 are family of 78XX integrated circuit. It produces fixed voltage at the output. 78 represents series and XX represents the output voltage. At the output of the regulator a capacitor is connected. Thus output is connected to the battery

CIRCUIT DIAGRAM

How to Operate???

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

Now connect Ac voltage to the transformer.Switch on the supply.Connect the battery charger at the output of the

circuit.Make sure that AC and DC sources should not

have common connections.You can observe the battery charging at the

output

Advantages

• Getting rid of great deal of cables !

• More secure, no risk of getting shocked.

• Places where you can not have physical cable, solution WiTricity

APPLICATIONS

• Consumer electronics

• Transportation

• Industry applications

• Other applications

– Medical devices

– Military applications

– Robots

WiTricity

WITRICITY CONCERNS

Will it harm me?

Will it harm the environment?

Will it interfere with important

communication?

NO

WiTricity

Range Of WiTricity

• WiTricity can perform electric transmission 2 cm to 3-4 meters.

• Scientists are working on extending this range

• Regarding efficiency –

With development done by MIT-IBM

efficiency raised to around %90 - %95

LIMITATIONS

• Power is somewhat wasted due to mutual induction.

• It will work for very short distances only. If you want to use it for long distances, then the number of inductor turns should be high.

WiTricity

If we apply this idea to the whole city, we might not have to use any wired cable. Moreover, in the future, it would save the material cost, and

“ W E C A N S AV E T H E W O R L D , Y E A H ! ! ! ”

Think that the city will becovered with WiTricity hot spots, just like Wireless Internet,there will be no need of chargingbatteries, or carrying adaptersall around !

Future of WiTricity

ANY QUERIES ?