Currently, wired electricity powers nearly everything. It travels through wires in the form of Alternating Current electricity, and powers most of our devices. Wireless trasmission of energy will remove our dependency on wires
MIT powered 60 watt light bulb from 2 meters (7 ft) at 40% efficiency
Splashpower Ltd. is a United Kingdom-based company founded in June 2001
electromagnetic waves are harmless as long as they’re transferred at the right frequency.
Need more light in your office, no need for electrician. Simply place the lamp where ever you need it.
will this possibly cause Luekemia or some kind of cancer. That fear is always raised about those living near large power transformers and lines. The fear has never been scientifically justified as being true but if this wireless power were in every room in every house in the United States it would be a matter of time before we would possibly know because the numbers of Leukemia patients would probably drastically go up
in the macroscopic world, this scheme could potentially be used to deliver power to robots and/or computers in a factory room, or electric buses on a highway (source-cavity would in this case be a ‘‘pipe’’ running above the highway). In the microscopic world, where much smaller wavelengths would be used and smaller powers are needed, one could use it to implement optical inter-connects for CMOS electronics, or to transfer energy to autonomous nano-objects (e.g. MEMS or nanorobots) without worrying much about the relative alignment between the sources and the devices.
Transcript of "Witricity"
TABLE OF CONTENTS
WHAT IS WITRICITY
Electricity without wires
History of Wireless Power
In 1899, Sir Nikola
Tesla Proposed a
method of Wireless
As it is in Radiative
mode, most of the
Power was wasted
and has less
The forgotten invention is reborn in
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"
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
HOW DOES RESONANT
Same principles as magnetic induction, but uses
resonance to increase the range.
Everything resonates at a certain frequency, based on
its shape and material.
Energy transfers easily between resonating objects.
With resonant induction, power is transmitted between
two resonating coils.
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.
WiTricity Technology: The Basics
There are witricity power sources(transmitter) and
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
Highly Resonant Strong Coupling Provides
High Efficiency Over Distance
Energy 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
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.
-Reduce product failure rates by fixing the ‘weakest link’: flexing wiring and
• More Environmentally Friendly:
-Reduce use of disposable batteries.
-Use efficient electric ‘grid power’ directly instead of inefficient battery
Benefits of witricity
Safe, fairly efficient, good range
Boon for the devices which uses midrange
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
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
Will it harm me?
Will it harm the environment?
Will it interfere with important
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
– Medical devices
– Military applications
Features and benefits
Witricity’s Technology Technology Benefit
Highly resonant strong coupling High efficiency over distance
Energy transfer via magnetic
Can penetrate and wrap around
Non radiative energy transfer Safe for living beings and other
Flexible geometry Device that can fit into OEM
Scalable design From Mw to kW
Long Range Wireless Energy Transmission:
Microwave Power Transfer
Microwave Power Transfer (MPT) is a form of wave powerMicrowave Power Transfer (MPT) is a form of wave power
transfer that sends energy through air in the form oftransfer that sends energy through air in the form of
MPT has a range miles longer than its inductive counterparts,MPT has a range miles longer than its inductive counterparts,
and it’s being investigated as a way to beam power to space.and it’s being investigated as a way to beam power to space.
Recently a Canadian program sent up SHARP (Stationary High
Altitude Relay Platform), a small unmanned aircraft powered
completely by energy beamed to it from the ground through
Solar Power Satellites (SPS) could also be an application for
MPT. Beaming solar energy collected from satellites or solar
panels on the moon to Earth could be a solution to our clean
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