Wireless power transmission via resonance coupling.

BALOCHISTAN UNIVERSITY OF INFORMATION TECHNOLOGY, ENGINEERING & MANAGEMENT SCIENCES

Group Members:

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Introduction

Wireless electricity or witricity is

the transfer of electric energy or

power over a distance without the

use of wires.

In order for the energy to be

transferred safely coupled resonators

are used.

Coupled resonators are two objects

of the same resonant frequency that

exchange energy efficiently without

much leakage .

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Block Diagram:

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Transmitter Section:

DC power Source: Step-Down transformer, rectifer circuit convert that

AC voltage to DC signal

Oscillator Circuit: Royer Oscillator(achieve a high oscillating current for

the transmitter coil).

Transmitter Coil: L= d2n2/(l+0.45d)

The operating frequency of the oscillator is determined

by the resonance formula given below

F = ½ × π × √ (LC)

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Receiver Section:

Receiver coil:

Rectifier circuit and a voltage regulator IC: LM 7805 voltage regulator IC

The rectifier circuit in the receiver section converts this AC voltage in to DC

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METHODS USED FOR WIRELESS POWER

TRANSMISSION

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Far Field Electricity Transmission Radio/Microwave Power transmission Laser Power Transmission Near Field Electricity Transmission Inductive Charging Evanescent/Resonant Wave Coupling

INDUCTION (INDUCTIVE COUPLING):

• The simplest example for wireless energy transfer using this method is the electrical

transformer.

• The main drawback of this method is the short range.

• A larger, stronger field can be used for energy transfer over large distance, but this

process is extremely inefficient. Since magnetic field spreads in all direction, making

a large wastage of energy.

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Power is transmitted when the coils have same resonant frequency.

By using resonant induction one coil can send electricity to several receiving coils as long as they all resonate at same frequency.

Resonance : It is the tendency of a system to oscillate with larger amplitude at some frequencies than at others.

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Why not wires??

As per studies, most electrical energy transfer is through wires.

Most of the energy loss is during transmission

On an average, more than30%

In Pakistan, it exceeds by 40%

Why not batteries?? Estimated that 40 billion

batteries per year add to the

e-waste burden. And of course its

not a good sign.

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Advantages and Hurdles

It can do away with costly grids and substations.

Homes and cities can be provided power wireless from a central transmission point.

Battery operated devices will never run out of power.

we can have cars that run non-stop with full battery charge.

We will never have to go to charging station.

Aircraft can fly nonstop with no need to refuel.

The future highway could have inductive coils imbedded in the road.

Hurdles/ Disadvantages: Biological Drawbacks (line of sight of microwave and Laser signal).

Economic cost.

Less efficiency.

Short distance.(2cm)

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Scope

01/12/201412

no need of power cables.no need of charging batteries, orbuying new batteries for yourelectrical gadgets.

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Gantt Chart

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References:

A next generation power transmission system”, International Journal of Computer Applications (0975 – 8887) (Volume 1 – No. 13)

Witricity

Peter Vaessen,” Wireless Power Transmission”, Leonardo Energy, September 2009 11/2/14 Wireless Power

www.wikipedia.com

http://www.sciencedirect.com/science/journals

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Questions

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