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1. Presented by
Raghavendra
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Department of Electrical and electronics Engineering
BNM Institute of Technology, bangalore

2.  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
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3.  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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4.  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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5. Reliable
Efficient
Fast
Low maintenance cost
Can be used for short-range or
long-range.
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6.  Nikola Tesla in late 1890s
 Pioneer of induction techniques
 His vision for “World Wireless System”
 The 187 feet tall tower to broadcast energy
 All people can have access to free energy
 Due to shortage of funds, tower did not
operate
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7.  Near-field techniques
 Inductive Coupling
 Resonant Inductive Coupling
 Air Ionization
 Far-field techniques
 Microwave Power Transmission (MPT)
 LASER power transmission
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8.  Primary and secondary coils are not connected with
wires.
 Energy transfer is due to Mutual Induction
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9.  Transformer is also an example
 Energy transfer devices are usually air-cored
 Wireless Charging Pad(WCP),electric brushes are
some examples
 On a WCP, the devices are to be kept, battery will
be automatically charged.
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10.  Combination of inductive coupling and
resonance
 Resonance makes two objects interact very
strongly
 Inductance induces current
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11.  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
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15.  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
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16.  No wires
 No e-waste
 Need for battery is
eliminated
 Efficient energy transfer
using RIC
 Harmless, if field
strengths under safety
levels
 Maintenance cost is less
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17.  Distance constraint
 Field strengths have to be under safety levels
 Initial cost is high
 In RIC, tuning is difficult
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18. Electric automobile charging
Consumer electronics
Industrial purposes
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20.  It permits long range of energy transfer
 Aim at high power transfer
 LASER or microwave
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21.  Transfer high power through outer atmosphere
without the need of wire
 Efficiency is high at receiver and transmitter end
 Attenuation is less

22.  Used to transmit energy point to point
 Also known as laser power beaming
 Simple receiver
 Photovoltaic cell
 Cost-efficient
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23.  To provide energy to earths increasing energy need
 Solar energy is captured using photocells
 Each SPS may have 400 million photocells
 Transmitted to earth in the form of microwaves/LASER
 Using rectenna/photovoltaic cell, the energy is
converted to electrical energy
 Receives power on earth by using rectennas
 Efficiency exceeds 95% if microwave is used.
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24.  Stands for rectifying antenna
 Consists of mesh of dipoles and diodes
 Converts microwave to its DC equivalent
 Usually multi-element phased array
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25.  Rectenna in US receives 5000MW of power from SPS
 It is about one and a half mile long
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26.  Efficient
 Easy
 Low maintenance cost
 More effective when the transmitting and receiving
points are along a line-of-sight
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27.  Initial cost is high
 When LASERs are used,
 Absorption loss is high
 When microwaves are used,
 interference may arise
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28.  Far-field energy transfer
 Solar Power Satellites
 Laser power beaming is used in military weapon
aerospace
 Spacecraft , satellites , etc
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29.  Transmission without wires- a reality
 Efficient
 Low maintenance cost. But, high initial cost
 Better than conventional wired transfer
 Energy crisis can be decreased
 Low loss
 In near future, world will be completely wireless
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