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What is witricity?
Witricity is nothing but wireless electricity.
Transmission of electrical energy from one object to another without the use of wires is called as Witricity.
Because of Witricity some of the devices won't require batteries to operate.
Story behind WITRICITY
The story started late one night a few years ago. It was probably the sixth time that month that MIT Professor Marin Soljacic was awakened by his mobile phone beeping battery low. At that time it occurred to him that there is electricity wired all through his house, office-everywhere. He think about- how it is possible to use electricity without using wires…
Eureka! Coupled Resonators
BASICS
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.
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.
WITRICITy technology
The Transfer of Electricity from one place to another without wires is known as “Witricity”.
There is 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 magnetic resonators.
Magnetic resonators efficiently transfer power over large distance via the magnetic near-field.
Near field
Near field is a wireless transmission technique over distances comparable to or a few times the diameter of devices.
Near field is usually magnetic.
Near field energy is non radiative .but some radiative and resistive losses will occur.
Coupled resonators
Two resonant objects of the same resonant frequency tend to exchange energy.
It exchange energy strongly ,while interacting weakly with living beings and other environmental objects.
Coupled resonators are said to be operate in strongly coupled regime to avoid material absorption and radiative loss.
Strong coupling
Strength of interaction is very high.
Coupling constant ‘g’>=1
Energy transfer is very efficient.
The rate of energy transfer is substantially higher than rate of energy lose.