WiTricity

FUTURE OF ELECTRICITY!!!

Wireless Electricity”

Why do we need wireless electricity???

The need of electricity in every nook and corner of the world

The demand of eco-friendly power

Requirement of efficient and reliable power

To reduce dependence on wires and batteries

The ever increasing power demand

History of Wireless Power:

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.

Tesla was able to transfer energy from one coil to another coil

He managed to light 200 lamps from a distance of 40km

The idea of Tesla is taken in to research after

100 years by a team led by Marin Soljacic from MIT. The project is named as ‘WiTricity’.

Tesla’s ingenious design for the wireless transmission of energy

1The Witricity Team

In 2007,6 MIT membersheaded by Marin Soljacic were able to successfully transmit power to a bulb within a distance of 2m at a freq of 9.9MHz using concepts of non radiative mid range energy transferResonanceinductive couplingEfficiency at that point was just approximately 43%

Experimental Design:Our experimental scheme consists of two Self-resonant

coils. One coil (source coil) is coupled inductively to an oscillating circuit; the other (device coil) is coupled inductively to a resistive load. Self-resonant coils rely on the interplay between distributed inductance and distributed capacitance to achieve resonance.

WiTricity TechnologyPower source is connected to ac power.

Bulb is connected to capture device.

Blue lines represent the magnetic near field induced by the power source.

Yellow lines represent the flow of energy from the source to the capture

coil.

This powers light bulb.

The magnetic field can wrap around the obstacle between power source and

capture coil.

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basics

electricity

magnetism

Energy coupling

Magnetic induction

Electro magnetis

m

Resonant magnetic coupling

resonance

Basics of WITRICITY

•Electricity is a general term that encompasses a variety of phenomena resulting from the presence and flow of electric charge.•Magnetism is a force that acts at a distance due to a magnetic field. This field is caused by moving electrically charged particles or is inherent in magnetic objects such as magnet.

FUNDAMENTALS

•Electromagnetic induction is the production of voltage across a conductor moving through a magnetic field.•Electromagnetism is one of the four fundamental interactions of nature, along with strong interaction, weak interaction and gravitation. It is the force that causes the interaction between electrically charged particles; the areas in which this happens are called electromagnetic fields•Energy/Power Coupling: Energy coupling occurs when an energy source has a means of transferring energy to another object

•Resonance :is the tendency of a system to oscillate with larger amplitude at some frequencies than at others. These are known as the system's resonant frequencies (or resonance frequencies). At these frequencies, even small periodic driving forces can produce large amplitude oscillations•Resonant Magnetic Coupling: 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.

Types of wireless energy transfer techniques are:-

Short range– Inductive coupling

Mid range– Resonance Inductive coupling

Long range-Electromagnetic Wave Power Transfer

Inductive coupling

•Inductive Coupling is a method for short range wireless energy transfer.•Inductive coupling works on the principles of electro magnetic induction.• Its range can vary, but it’s often very short.

Wireless electricity makes use of the concept-“Oscillating electric field produces magnetic field and oscillating magnetic field produces electric field”.

1Resonant Inductive Coupling

Uses almost the same concept as Inductive coupling just that the coils operate at resonant frequency leading to efficient transfer of energy over a larger distance

LONG RANGE: FAR-FIELD POWER TRANSFER

Far-field method achieves longer ranges which is much greater than the diameter of device.

These far-field type techniques include Radio & Microwave Power Transmission Techniques & LASER Techniques.

Block diagram for witricity mechanism

WITRICITY ENABLED ROOM

Automatic wireless charging of mobile electronics in home, car, office,...while devices are in use and mobile.

Direct wireless powering of stationary devices…eliminating expensive custom wiring, unsightly cables and “wall-wart” power supplies.

CONSUMER ELECTRONICS

APPLICATIONS

Transportation•Automatic wireless charging for existing electric vehicle classes: golf carts, industrial vehicles.

•Automatic wireless charging for future hybrid and all-electric passenger and commercial vehicles, at home, in parking garages, at fleet depots, and at remote kiosks.

•Direct wireless power interconnections to replace costly vehicle wiring harnesses and slip rings.

•Direct wireless power interconnections and automatic wireless charging for implantable medical devices (ventricular assist devices, pacemaker, defibrilator, etc).

•Automatic wireless charging and for high tech military systems (battery powered mobile devices, covert sensors, unmanned mobile robots and aircraft, etc).•Direct wireless powering and automatic wireless charging of smart cards.•Direct wireless powering and automatic wireless charging of consumer appliances, mobile robots, etc.

Other Applications

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Production of 40 Billion Disposable Batteries / Yr can be reduced

WE CAN REDUCE Trillion Of Towers which are Around Us

WiTricity’s technology is a non-radiative mode of energy transfer, relying instead on the magnetic near field. Magnetic fields interact very weakly with biological organisms—people and animals—and are scientifically regarded to be safe. WiTricity products are being designed to comply with applicable safety standards and regulations.

IS WITRICITY TECHNOLOGY SAFE ?

ADVANTAGES No need of line of sight. No need of power cables

and batteries. Does not interfere with

radio waves.

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Wastage of power is less. Negative health implications.Highly efficient than electromagnetic induction. Less costly

Wireless power transmission can be possible only in few meters.

Efficiency is only about 40%.

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Disadvantages

THANK U A

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