wireless power system
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Wireless Power Transmission
Presented by
Hinal Shah08EJGEC034Department of Electronics and Communication EngineeringJNIT, Jaipur
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OverviewWhat is wireless power
transmission(WPT)?Why is WPT?History of WPTTypes of WPT
◦ Techniques to transfer energy wirelesslyAdvantages and disadvantagesApplicationsConclusion
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What is WPT?The transmission of energy from
one place to another without using wires
Conventional energy transfer is using wires
But, the wireless transmission is made possible by using various technologies
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Why not wires? As per studies, most electrical
energy transfer is through wires. Most of the energy loss is during
transmission• On an average, more than 30%• In India, it exceeds 40%
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Why WPT?
ReliableEfficientFastLow maintenance costCan be used for short-range or long-range.
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History
Nikola Tesla work in late 1890sPioneer of induction techniquesHis vision for “World Wireless
System”The 187 feet tall tower to broadcast
energyAll people can have access to free
energyDue to shortage of funds, tower did
not operate
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History (contd…)Tesla was able to transfer energy
from one coil to another coilHe managed to light 200 lamps
from a distance of 40kmThe idea of Tesla is taken in to
research after 100 years by a team led by Marin Soljačić from MIT. The project is named as ‘WiTricity’.
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Energy CouplingThe transfer of energy
◦Magnetic coupling◦Inductive coupling
Simplest Wireless Energy coupling is a transformer
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Types and Technologies of WPTNear-field techniques
Inductive CouplingResonant Inductive CouplingAir Ionization
Far-field techniquesMicrowave Power Transmission
(MPT)LASER power transmission
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Inductive coupling Primary and secondary coils are
not connected with wires.Energy transfer is due to Mutual
Induction
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Resonance Inductive Coupling(RIC)Combination of inductive
coupling and resonanceResonance makes two objects
interact very stronglyInductance induces current
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An example
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WiTricityBased on RICLed by MIT’s Marin SoljačićEnergy transfer wirelessly for a
distance just more than 2m. Coils were in helical shapeNo capacitor was usedEfficiency achieved was around
40%
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WiTricity (contd…)
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RIC vs. inductive couplingRIC is highly efficientRIC has much greater range than
inductive couplingRIC is directional when compared
to inductive couplingRIC can be one-to-many. But
usually inductive coupling is one-to-one
Devices using RIC technique are highly portable
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Advantages of near-field techniquesNo wiresNo e-wasteNeed for battery is
eliminatedEfficient energy
transfer using RICHarmless, if field
strengths under safety levels
Maintenance cost is less
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DisadvantagesDistance constraintField strengths have to be under
safety levelsInitial cost is highIn RIC, tuning is difficultHigh frequency signals must be
the supplyAir ionization technique is not
feasible
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Far-field energy transfer
RadiativeNeeds line-of-sightLASER or microwaveAims at high power transfer
Tesla’s tower was built for this
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Microwave Power Transfer(MPT)Transfers high power from one
place to another. Two places being in line of sight usually
Steps:◦Electrical energy to microwave
energy◦Capturing microwaves using
rectenna◦Microwave energy to electrical
energy
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Solar Power Satellites (SPS)
To provide energy to earth’s increasing energy need
To efficiently make use of renewable energy i.e., solar energy
SPS are placed in geostationary orbits
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SPS (contd…)Solar energy is captured using
photocellsEach SPS may have 400 million
photocellsTransmitted to earth in the form
of microwaves/LASERUsing rectenna/photovoltaic cell,
the energy is converted to electrical energy
Efficiency exceeds 95% if microwave is used.
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Rectenna in USRectenna in US receives 5000MW
of power from SPSIt is about one and a half mile
long
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LASER vs. MPTWhen LASER is used, the antenna
sizes can be much smallerMicrowaves can face interference
(two frequencies can be used for WPT are 2.45GHz and 5.4GHz)
LASER has high attenuation loss and also it gets diffracted by atmospheric particles easily
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Advantages of far-field energy transferEfficientEasyNeed for grids, substations etc
are eliminatedLow maintenance costMore effective when the
transmitting and receiving points are along a line-of-sight
Can reach the places which are remote
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Disadvantages of far-field energy trasnferRadiativeNeeds line-of-sightInitial cost is highWhen LASERs are used,
◦conversion is inefficient◦Absorption loss is high
When microwaves are used, ◦interference may arise◦FRIED BIRD effect
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ApplicationsNear-field energy transfer
◦ Electric automobile charging Static and moving
◦ Consumer electronics◦ Industrial purposes
Harsh environment
Far-field energy transfer◦ Solar Power Satellites◦ Energy to remote areas◦ Can broadcast energy globally (in future)
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ConclusionTransmission without wires- a realityEfficientLow maintenance cost. But, high initial
costBetter than conventional wired
transferEnergy crisis can be decreasedLow loss In near future, world will be
completely wireless
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THANK YOU!
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