Wireless power transmission

Submitted by:
Name: SHAHRUKH JAVED
Institute: TJIT

 What is wireless power transmission(WPT)?
 Why is WPT?
 History of WPT
 Types of WPT
› Techniques to transfer energy wirelessly
 Advantages and disadvantages
 Applications
 Conclusion
 References

 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.

 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%.

 Reliable.
 Efficient.
 Fast.
 Low maintenance cost.
 Can be used for short-range or long-range.

 Nikola Tesla in late 1890s.
 His vision for “World Wireless System”.
 The 187 feet tall tower to broadcast energy.
 All people can have access to free energy.
 Shortage of fund lead to no operation.
 He used to lamp 200 lights from 40 km distance

 Near-field techniques.
Inductive Coupling.
Resonant Inductive Coupling.
Air Ionization.
 Far-field techniques.
Microwave Power Transmission (MPT).
LASER power transmission.

 The transfer of energy
› Magnetic coupling
› Inductive coupling
 Simplest Wireless Energy
coupling is a transformer

 Primary and secondary
coils are not connected
with wires.
 Energy transfer is due to
Mutual Induction
 Wireless Charging
Pad(WCP) ,Electric
Brushes are some
examples.

 The capacitor and inductor forms the
resonator. Charge oscillates between
inductor (as magnetic field) and
capacitor (as electric field.)
 This type of oscillation is called
resonance if the reactance's
of the inductor and capacitor
are equal.

 Coil provides the inductance.
 Capacitor is connected parallel
to the coil.
 Energy will be shifting back and
forth between magnetic field
surrounding the coil and electric
field around the capacitor.
 Radiation loss will be negligible

 Toughest technique under near-
field energy transfer techniques
 Air ionizes only when there is a
high field
 Needed field is 2.11MV/m
 Natural example: Lightening
 Not feasible for practical
implementation.

Advantages:
 No wire, No e-waste
 Need for battery eliminated
 Efficient & Harmless
Disadvantages:
 Distance constraint
 Field should be under safety level
 High initial cost
 Tuning is difficult in RIC

 LASER is highly directional, coherent.
 Not dispersed for very long.
 But, gets attenuated when it propagates through
atmosphere.
 Simple receiver.
› Photovoltaic cell.
 Cost-efficient.

 To efficiently make use of renewable
energy i.e., solar energy.
 SPS are placed in geostationary
orbits.
 Each SPS may have 400 million
photocells.
 Efficiency exceeds 95%
if microwave is used.

 Advantages:
 Efficient , Easy
 Need for grid eliminated
 Low maintenance cost
 More effective when the
transmitting and receiving points
are along a line-of-sight
 Can reach the places which are
remote.
 Disadvantages:
 Radiate
 When LASERs are used,
› conversion is inefficient
› Absorption loss is high
 When microwaves are used,
› interference may arise

 Qi(Chee) is a interface
standard.
 Developed by Wireless
Power Consortium.
 It works for a distance up to
40mm(1.6inches).
 Comprises a transmission
pad & a compatible receiver

 Near-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)

 Transmission without wires- a reality.
 Efficient & Low loss.
 Low maintenance cost. But, high initial cost.
 Better than conventional wired transfer.
 Energy crisis can be decreased.
 In near future, world will be completely
wireless

Wireless power transmission

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