2. What Is Wire-less Power Transmission ?
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• Wireless PowerTransmission or Wireless Energy
Transmission is the transmission of electrical
energy from a power source to an electrical
load without conductors.
3. What Is Wire-less Power Transmission ?
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• Wireless transmission is useful in cases where
interconnecting wires are inconvenient, hazardous,
and/or impossible.
4. History of WIRELESS POWER
TRANSMISSION
In 1901, NikolaTesla used the
Principle of electrodynamics
induction to transfer
electromagnetic energy without
the need of wires to construct the
Wardenclyffe tower (Figure 1) to
transmit power betweenAmerica
and Europe but was destroyed by
US government in 1917.
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5. • A magnetic field is
created around the
wire if electricity is
transmitted down a
wire
Andre Marie
Ampere
• Faraday developed the
fundamental law of
induction,a process that
enables the transfer of
power from one wire to
another using magnetic
field.
Michael
Faraday • Maxwell equation was
established, which is the
basis of several
everyday devices
including electrical
motors and generators
Maxwell
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6. Researches Over WIRELESS
TRANSMISSION
In 2007, MIT researchers proposed the wireless power
transmission based on strong coupled magnetic
resonance and successfully lightened a 60W bulb over
2 meters with a transfer efficiency of 30%.
In 2008, Intel demonstrated an experiment setup to
lighten a 60W bulb over 1 meter with the transfer
efficiency of 70 %.
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9. The technologies for wireless charging
can be magnetic induction, radio
frequency, optical or conduction.
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10. • Magnetic induction converts electrical energy to
magnetic energy. It allows transmission over an air
gap and is typically short to midrange
• For microwave or radio frequency, the parabolic
dish focuses radio waves which are typically long
range waves towards intended target.
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11. • For optical or infrared, the laser light is focused on
photovoltaic cells that convert light energy to
power.
• In conduction, the power transfer occurs due to
metallic contact between transmitter and receiver.
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12. Magnetic induction has two categories namely magnetic
induction coupling and magnetic resonance coupling.
In inductive coupling, the source drives a primary coil
creating a sinusoidal varying magnetic field which induces
a voltage across terminals of secondary coil, thus
transferring power to load.
Magnetic resonance coupling is more advantageous since
it has an extended range and potential to support multiple
receivers.
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19. ADVANTAGES
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LIMITATIONS
•Wireless
• A number of devices can be
charged at a time
• Electrically safe
• Can be used in harsh
environments due to
encapsulation
• High power in output
• Waterproof
• Low maintenance
• Charging is convenient
•More power consumption
• Low efficiency
• Heat generation is more
than traditional charging
• Complex circuitry
• More costly
• SlowCharging
• High cost of manufacturing
• Harmful magnetic adiations
emitted
20. APPLICATIONS
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In Mobile Phones
In Cordless Phones
In Electric Car
In Laptops
In Low Power Consuming Appliances.
24. Conclusion
Wireless energy transmission technology has been
developed in which electrical energy is transmitted from
power source to an electrical device without using wires.
The technology has improved sustainability
consists of various drawbacks which need
but still
to be
researched upon in order to commercialize it.
26 November 2013
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