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CONTENTS

Introduction Need for a wireless energy transmission

Methods for wireless energy transfer

Practical implementation models Advantages

Disadvantages

Uses

Conclusion


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Introduction

Wireless energy transfer has been around for about a

century

But they are found usage in things like electrictoothbrush rechargers and specialty applications such as

beaming solar power down from space.

As the wireless art developed during the turn of the 20thcentury, industry was looking toward a method of

wireless energy transfer

Some of the scientists who worked for energy transfer


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Need for a wireless energytransmission

Electrical power accounts for much of the energyconsumed.

Much of this power is wasted during transmission from

power plant generators to the consumer.

The resistance of the wire used in the electrical grid

distribution system causes a loss of 26-30% of the

energy

This loss implies that our present system of electrical

distribution is

onl 70-74% efficient.


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There are three main methods forwireless energy transfer in use today:

Induction

Electromagnetic

transmission

Evanescent wave coupling

Methods for wireless energy

transfer


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INDUCTION

Transformers are probably the simplest example of

wireless power transfer.

The two circuits of a transformer are physically isolated,but transfer power by magnetic coupling through

induction .

Induction cookers are a prime example of how this isused.

The main drawback to induction, however, is the short

range it means the receiver must be very close


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ElectromagneticTransmission

Electromagnetic waves, commonly known as light, canalso be used to transfer power wirelessly.

By converting electricity into light, such as a laser beam,

then firing this beam at a receiving target, such as asolar cell on a small aircraft.

Drawbacks:

First, the conversion to light, such as a laser, is usuallyvery inefficient.

Also, atmospheric absorption causes further losses


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Practical implementationmodels

This picture is the first experimental project of Tesla. Itproved the possibilities


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Practical implementationmodels

This figure shows the infrared display of the materialemitting some energy


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