SUBMITTED TO:-Mr Ram Bhagat ,Assistant professor(Dept of Electrical Engineering)
The transmission of energy from one place to another without using wires
Conventional energy transfer is using wires ,which results in large Copper
But, the wireless transmission is made possible by using various
technologies based on Resonant frequency ,Inductive coupling etc.
Near Field Techniques
Resonant Inductive Coupling
Far Field Techniques
Laser power Transmission
Microwave Power Transmission
Solar power Satellite(SPS)
It is based on the FARADAY’S LAW OF
Make use of coils. The coils are not connected
through wire or any other kind of material.
Transfer of energy is due to mutual induction.
Its based on the concept :- that an oscillating
electric field produces magnetic field and an
oscillating magnetic field produces oscillating
Same inductive coupling(EMI) concept but
the coils here operate at their resonating
Inductance induces current.
Resonance makes both the coil to operate at
Fields are non-radiative in nature.
RIC is highly efficient
RIC has much greater range than inductive coupling
RIC is directional when compared to inductive coupling
RIC can be one-to-many. but usually inductive coupling is
Devices using RIC technique are highly portable
ADVANTAGES OF NEAR FIELD TECHNOLOGY
For short range transmission
Aims low power transmission
Need for battery is eliminated
Efficient energy transfer using RIC
Harmless, if field strengths under safety levels
Maintenance cost is less
DISADVANTAGES OF NEAR FIELD TECHNOLOGY
Field strengths have to be under safety levels
Initial cost is high
In RIC, tuning is difficult
High frequency signals must be the supply
APPLICATION OF NEAR FIELD
Electric automobile charging
FAR FIELD ENERGY TRANSMISSION
Aims high power transmission
For long range of transmission
Require line of sight
Radiative in nature
Microwave Power Transmission (MPT)
LASER Power Transmission
Solar power Satellite(SPS)
MICROWAVE POWER TRANSMISSION (MPT)
Transfers high power from one place to another.
Two places being in line of sight usually.
Electrical energy converted to microwave energy
Capturing microwave using retina.
Conversion of microwave energy into electrical
Transmission of electrical energy.
LASER POWER TRANSMISSION
LASER is highly directional and coherent
But, gets attenuated when it propagates
Satellites are placed in geostationary orbit
Solar energy is captured using photocells
Each SPS may have 400 million photocells
Transmitted to earth in the form of
Using rectenna/photovoltaic cell, the energy
is converted to electrical energy
Efficiency exceeds 95% if microwave is used.
ADVANTAGE OF FAR FIELD TECHNIQUE
Need for grids, substations etc are eliminated
More effective when the transmitting and receiving points are along a line-of-
Initial cost is high
When LASERs are used,
conversion is inefficient
Absorption loss is high
When microwaves are used,
interference may arise
Needs positioning and GPS systems.
Transmission of electrical energy from one object to another without the use of
wires is called as WiTricity.
Wireless transmission is useful in cases where interconnecting wires are
inconvenient, hazardous, or impossible.
HOW WITRICITY WORK???
Near-field inductive coupling through magnetic fields
It makes use of resonating frequency to transmit energy.
THE FORGOTTEN INVENTION IS REBORN IN 2007
In 2007,6 MIT members headed by Marin Soljacic were able to successfully transmit power to a bulb within a
distance of 2m at a frequency of 9.9MHz using concepts of non radiative mid range energy transfer.
Efficiency at that point was just approximately 43%
To fulfil the ever increasing demand of nation.
It is efficient and reliable.
Its application are eco-friendly.
Safe for humans.
Low maintenance cost.
Can be used for short-range and long-range transmission.
Wireless technology is a non-radiative mode of energy transfer, relying
instead on the magnetic near field.
WHY WIRELESS OR WHY NOT WIRES ?
Conventional medium of transferring electrical energy is wires.
So most of losses occurs during transmission.
Globally on an average about 30%.
In India its about 40% or more.
Billions, trillions of $ is spend on wires and in their installation.
Waste management a challenge in 21 century.
40 billion disposal batteries added to e-waste every year.
PVC is non-biodegradable.
NETWORK OF WIRES ON ELECTRIC
POLES IN DARYAGANJ, NEW DELHI
RESONANCE INDUCTIVE COUPLING
Two objects having same resonating frequency
and in Magnetic resonance at Strongly coupled
regime tend to exchange energy , while
dissipating relatively little energy to the
extraneous off-resonant objects.
The equipment used is sometimes called
a resonant or resonance transformer.
Automatic Wireless Power Charging :-
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.
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.
Automatic wireless charging of phones, laptops, game controllers in home, car, office,
Direct wireless powering of stationary devices like flat screen TV's, digital picture
frames, home theatre accessories, wireless loud speakers etc ,eliminating expensive
custom wiring, unsightly cables and "wall-wart" power supplies.
Direct wireless powering of desktop PC peripherals: wireless mouse, keyboard,
printer, speakers, display, etc. eliminating disposable batteries and awkward cabling.
Direct wireless power and communication interconnections across rotating
and moving "joints" (robots, packaging machinery, assembly machinery,
machine tools) . eliminating costly and failure-prone wiring.
Direct wireless power and communication interconnections at points of use
in harsh environments (drilling, mining, underwater, etc.) ... where it is
impractical or impossible to run wires.
Direct wireless power for wireless sensors and actuators, eliminating the
need for expensive power wiring or battery replacement and disposal..
Automatic wireless charging for existing electric vehicle classes: golf carts,
Automatic wireless charging for future hybrid and all-electric passenger and
commercial vehicles, at home, in parking garages, at fleet depots.