WIRELESS ELECTRICITY

PREPARED BY : ARYA LEXMI ROLL NO. 17 S5 ,

ELECTRONICS

OutlineIntroductionWhat is WiTricity ? Background Technique to transferHow wireless power worksFeatures &benefitsAdvantagesIs WiTricity secure ?Safety concernsRange of WiTricityRidiculous technologyUsage AreasFuture of WiTricity

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Normally, we picture electric devices with wires. For example, laptop, cell phone, lamp etc. Remember every time you travel or at home, you need to pack all the adapters and chargers for your devices. It’s unpractical, isn’t it. The solution is near.

What is Wi-Tricity ? Transmission of energy through the air.

Process of transferring electric energy or power over distance without wires.

Wi-Tricity, a portmanteau for "wireless electricity", is a trademark of WiTricity corporation referring to their devices and processes which use a form of wireless energy transfer including resonant energy transfer etc., the ability to provide electrical energy to remote objects without wires using oscillating magnetic fields.

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BackgroundNikola Tesla – The GeniusHe did enlighten 200 lamps at the distance of 40 km,

Wirelessly !

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Prof. Soljacic – Another GeniusMIT-IBM Collaboration

He did succeed to redesign Tesla’s experiment in safer way.

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Technique To TransferOne Simple Physics Rule !At Source : Electricity => Magnetic Wave At Device : Magnetic Wave => Electricity

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HOW WIRELESS POWER WORKS 1. Magnetic coil (Antenna A) is

housed in a box and can be set in wall or ceiling.

2. Antenna A, powered by mains, resonates at a specific frequency.

3. Electromagnetic waves transmitted through the air.

4. Second magnetic coil (Antenna B) fitted in laptop/TV etc resonates at same frequency as first coil and absorbs energy.

5. Energy charges the device.

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FEATURES & BENEFITSWITRICITY’S TECHNOLOGY TECHNOLOGY BENEFIT

  Highly Resonant Strong Coupling High Efficiency over Distance

Energy Transfer via Magnetic Near Field Penetrates and Wraps- Around Obstacles

Non-Radiative Energy Transfer Safe for People and Animals

Scalable Design From Milliwatts to Kilowatts

Flexible Geometry Devices That Can Fit Into OEM Products

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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

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WiTricity technology 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. Reduce product failure rates by fixing the ‘weakest link’: 

flexing wiring and mechanical interconnects.More Environmentally Friendly:

Reduce use of disposable batteries. Use efficient electric ‘grid power’ directly instead of inefficient

battery charging.

 

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Is WiTricity Secure ?Yes it is secure !Principle of witricity

is based on oscillating Magnetic fields.

We too live in a globe that is already surrounded by magnetic waves.

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Magnetic fields interact very weakly with biological organisms.

It uses a "non–radioactive mode of energy transfer.

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SAFETY CONCERNSIn the “far-field”, a transmitter would

emit mixture of magnetic and potentially dangerous electric fields. But, crucially, at a distance of less than one wavelength - the "near field" - it is almost entirely magnetic.

Hence, Witricity uses low frequency electromagnetic waves, whose waves are about 30m (100ft) long.

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Range Of WiTricityWiTricity can perform electric transmission

2 cm to 3-4 meters.Scientists are working on extending this

rangeRegarding efficiency –

With development done by MIT-IBM

efficiency raised to around %90 - %95

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“Ridiculous technology”Witricity is not the first jump on the concept

of wireless electricity.Today, chip-giant Intel has seized on a similar

idea to Witricity's , whilst other companies work on highly directional mechanisms of energy transfer, such as lasers.

However, unlike Witricity's work, lasers require an uninterrupted line of sight, and are therefore not good for powering objects around the home.

"You go from the sublime to the ridiculous“. 17

Usage AreasElectric CarsMedical Mobile PhonesComputersTelevisionsAny consumer electronics that needs

electricity

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Demo 1

One source is able to transfer the energy for the electronic devices.

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The main idea is that the two resonant object are at the same resonant frequency. They tend to exchange energy efficiently without interrupting other object with different frequency.

Different FrequencyDifferent Frequency

Aj. Roppon sings a song with

same frequency as red wine glass

Demo 2

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So, the glass of the corresponding frequency to Aj. Roppon’s voice accumulate sufficient energy to explode.

Different FrequencyDifferent Frequency

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Demo 3

Sony demonstrated its wirelessly powered television .[2010 October]

Demonstration of WiTricity on cellphone and LCD at the TED conference.

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Demo 4Batteries can be

charged , it is just enough to place the device to top of one of these surfaces.

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CLICK HERE

Demo 5

Charging Electric Car using WiTricity.

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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 “WE CAN SAVE THE WORLD, YEAH!!!”

Think that the city will be covered with WiTricity hot spots , just like Wireless Internet, there will be no need of charging batteries, or carrying adapters all around !

Future of WiTricity

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Thanks For Listening

Any Questions ?

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