Concepts of Wireless power transmission

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PRESENTATION BY:-
MD.AKTER HAMID
ID:15-28491-1
AIUB

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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

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In the year 1893,Nikola Tesla
proposed the method of
wireless transmission of
electric power
One of the greatest
breakthroughs of science at that
time

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Built the wardenclyffe tower
which could broadcast power
wirelessly using far-field
techniques. Called off as it
radiated power into
surroundings raising issues
of
power loss
Power theft
Health concerns
A dream
crashes……

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Types of wireless energy transfer
techniques are:-
Short range– Inductive
coupling
Mid range– Resonance
Inductive coupling
Long range-
Microwave Transmission

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Uses electromagnetic induction
concept-A term for the
interdependence of time-
varying electric and magnetic
fields
Wireless electricity makes use of
the concept-
“Oscillating electric field
produces magnetic field and
oscillating magnetic field
produces electric field”.

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Resonant 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

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D i f f e r e n t F r e q u e n c y
Resonance
Property of systems to operate at higher amplitudes at
purticular frequencies known as resonant frequencies than
at others.
When 2 objects operate at same resonant frequency they transfer
energy efficiently between them without interfering with the off
resonant objects.

9. Wireless electricity in our daily life
9

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Types of Long range/Far field
transmission techniques
Radio frequency Transmission
extracts small quantities of energy in
the range 902 and 928 MHz
Disadvantage—interference caused by
metal surfaces
Laser Transmission
Highly directional and coherent
Inefficient for wireless power
transmission

11. 11Microwave Transmission
Aims at higher power transfer over longer
distances practically in the range of some miles
Requires a microwave source, antenna and
rectenna
operates in the frequency range of 1-40GHz
operates at the highest efficiency at 2.45GHz
Steps:
1.conversion of electrical to microwave
energy
2.Capturing of microwave beams by
Rectenna
3.conversion of microwave to electrical

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Block diagram for microwave power
transmission model

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Major components of the
model
Microwave generator:
Microwave power sources used like Klystron,
magnetron, TWT or GaAs MESFETs
Output power is controlled by electronic
circuits.
Magnetron is most preferred at 2.45 GHz
Transmitting antenna:
Has the responsibility of transmitting
power.
Patch, Microstrip, parabolic dish or
slotted waveguide antenna may be used.
Rectenna:
Consists of a antenna ,rectifying diodes and
low pass filter.
Rectenna area has to be large.
Important for receiving microwave power

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SOLAR POWER SATELLITES:
The most imp. Application or advancement:
absorb light energy from sun.
converted to electric energy and beamed to earth
stations in form of microwave beams
so it can power satellites,aircrafts,even supply electricity
to places where wired connections are not possible at
lower prices.
SPACE POWER TRANSMISSION AND LUNAR BASED
PROJECTS:
satellites in space can receive microwave signals from
earth and beam it to any place on earth.
in future it encourages power projects on the moon
Applications of long range
transmission

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Advantages:
Disadvantages:
1. Efficient and reliable power.
2. Creation of a shock free environment devoid of any
chances of power thefts.
3. Provides solution to the ever increasing demand for
power.
4. A solution to reduce e-waste- a more safe environment.
5. A more cost effective methodology for getting
electricity to your houses which includes paying less for
use of power.
6. SPS are not affected by the day and night cycle leads
to lesser limitations on power harvesting.
1.For short and mid range transfer system has to be set at
the right frequency or there would be no power transfer.
2.For long range the installation cost is high while EMI is
also a concern.

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Prospects & Issues:
Conclusion:
Wireless electricity is not just a great idea but an urgent
measure
that has to be taken to deal with the current energy crisis.
Even the smallest entity can lead to one of the most
mindboggling dilemmas of the world. Electrons the source
of electricity puts us in a similar fix. It is on us to decide how
to tap these electrons to be useful in our lives.
Wireless electricity comes with its baggage but no can
deny that it is here to stay.
From the discussion its clear that this idea needs awareness
to remove doubts from minds of the people about safety
issues.
It requires both support from government and the people
financially and psychologically.

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References:
•An article published in the Science Magazine as “Wireless Power
Transfer via Strongly coupled magnetic fields ”
•“Efficient Non-Radiative Midrange Energy Transfer” by Aristeidies
karalis, Marlin Soljacic,2006.
• http://ieeexplore.ieee.org/Xplore/
•www.WiTricity.com
•www.WiTricitypower.com
•www.techjournal.com
•www.wikipedia.org
•http://www.sciencedirect.com/science/journals

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