SEMINAR PRESENTATION

ON

Electricity without wires

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In 1899, Sir Nikola Tesla Proposed a method of Wireless Power Transmission.

As it is in Radiative mode, most of the Power was wasted and has less efficiency.

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The idea of wireless electricity has been around since the early days of the Tesla coil. But thanks to a group of MIT scientists, team led by Marin Soljačić and named it "WiTricity"

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There are 3 major types , each with different ranges, methods of transfer

– Short range: Inductive Coupling

– Medium range: Resonant Induction

– Long range: Electromagnetic Wave Power Transfer

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Magnetic coupling occurs when two objects exchange energy through their varying or oscillating magnetic fields. Resonant coupling occurs when the natural frequencies of the two objects are approximately the same.

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There are witricity power sources(transmitter) and capture devices(receiver).

Power source provides power to the devices where as capture device captured it to work.

Power source and capture devices are specially designed ‘‘strongly-coupled’’ resonators for midrange wireless non-radiative energy transfer

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Highly Resonant Strong Coupling Provides High Efficiency Over DistanceEnergy Transfer via Magnetic Near Field Can Penetrate and Wrap Around Obstacles

Non-Radiative Energy Transfer is Safe for People and Animals

Flexible Geometry Allows WiTricity Devices to be Embedded Into Different Products

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It will make products :

• More Convenient: -No manual recharging or changing batteries. -Eliminate unsightly, unwieldy and costly power cords.

• More Reliable: -Never run out of battery power. • More Environmentally Friendly: -Reduce use of disposable batteries. -Use efficient electric ‘grid power’ directly instead of inefficient battery Charging.

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Safe, fairly efficient, good range Boon for the devices which uses

midrange power No need of line of sight. No need of power cables and batteries. Magnetic fields interact weakly with

biological masses (humans), and energy is only transmitted between resonating objects

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Transmissions possible only in few meters Possibility of “energy theft” Efficiency decreases with distance The resonance condition should be

satisfied and if any error exists, there is no possibility of power transfer.

It can not penetrate through METAL WALL

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Direct Wireless Power—when all the power a device needs is provided wirelessly, and no batteries are required. This mode is for a device that is always used within range of its WiTricity power source.

Automatic Wireless Charging—when a device with rechargeable batteries charges itself while still in use or at rest, without requiring a power cord or battery replacement. This mode is for a mobile device that may be used both in and out of range of its WiTricity power source

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Consumer electronics Transportation Industry applications Other applications› Medical devices› Military applications› Robots

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Highly resonant strong coupling High efficiency over distance

Energy transfer via magnetic near field

Can penetrate and wrap around obstacles

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Non radiative energy transfer Safe for living beings and other environmental objects

Flexible geometry Device that can fit into OEM (original equipment manufactures)products

Scalable design From Mw to kW

Witricity’s Technology Technology Benefit

Will it harm me? Will it harm the environment? Will it interfere with important communication?

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NO

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