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Presented By: 
Ahmad bilal saqib 
2012-EE-337 
Department Of Electrical Engineering & 
Tech. 
University of Engineering & Technology 
City Campus
 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 25% 
• In pakistan, it exceeds 26%
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 
 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
 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.
 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
 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 
 AC is converted to DC first 
 DC is converted to microwaves using 
magnetron
AC Power 
Outlet 
This is the 
AC power 
supply 
Power 
Conversion 
This converts 
the AC power to 
a microwave 
power signal 
Microwave 
Transmitter 
This 
transmits 
the 
microwave 
power signal 
Transmitting 
Side:
Transmitted waves are received at rectenna 
which rectifies, gives DC as the output 
 DC is converted back to AC 
 Rectenna: 
 Stands for rectifying antenna 
 Consists of mesh of dipoles and diodes 
 Converts microwave to its DC equivalent 
 Usually multi-element phased array
Block Diagram of MPT 
Rectenna Power 
Conversion 
Power 
Regulator 
Remote 
Device 
Receiving 
Side: 
This converts the microwave 
power signal to DC power 
signal 
This 
regulates DC 
voltage 
level 
Remote 
Device uses 
this DC power 
the same way 
it uses a 
battery
 LASER is highly directional, coherent 
 Not dispersed for very long 
 But, gets attenuated when it propagates 
through atmosphere 
 Simple receiver 
 Photovoltaic cell 
Cost-efficient
 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
Near-field energy transfer 
 Electric automobile charging 
Static and moving 
 Consumer electronics 
 Industrial purposes
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
 “Wireless Power Transmission”, Vol No.- 
45, Electronics For U –August-2013 
Peter Vaessen,” Wireless Power 
Transmission”, Leonardo Energy, 
September 2009 
 C.C. Leung, T.P. Chan, K.C. Lit, K.W. Tam 
and Lee Yi Chow, “Wireless Power 
Transmission and Charging Pad”
 White Paper on Solar Power Satellite 
(SPS) Systems, URSI, September 2006 
 Richard M. Dickinson, and Jerry Grey, 
“Lasers for Wireless Power 
Transmission” 
 David Schneider, “Electrons unplugged”, 
IEEE Spectrum, May 2010
Wirelesspower Transmission by Engineer AB SAQIB
Wirelesspower Transmission by Engineer AB SAQIB

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Wirelesspower Transmission by Engineer AB SAQIB

  • 1. Presented By: Ahmad bilal saqib 2012-EE-337 Department Of Electrical Engineering & Tech. University of Engineering & Technology City Campus
  • 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  References
  • 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
  • 4. As per studies, most electrical energy transfer is through wires. Most of the energy loss is during transmission • On an average, more than 25% • In pakistan, it exceeds 26%
  • 5. Reliable Efficient Fast Low maintenance cost Can be used for short-range or long-range.
  • 6.  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  He used to lamp 200 lights from 40 km distance
  • 7. Near-field techniques Inductive Coupling Resonant Inductive Coupling Air Ionization  Far-field techniques Microwave Power Transmission (MPT) LASER power transmission
  • 8.  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.
  • 9.  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
  • 10.  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
  • 11.  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  AC is converted to DC first  DC is converted to microwaves using magnetron
  • 12. AC Power Outlet This is the AC power supply Power Conversion This converts the AC power to a microwave power signal Microwave Transmitter This transmits the microwave power signal Transmitting Side:
  • 13. Transmitted waves are received at rectenna which rectifies, gives DC as the output  DC is converted back to AC  Rectenna:  Stands for rectifying antenna  Consists of mesh of dipoles and diodes  Converts microwave to its DC equivalent  Usually multi-element phased array
  • 14. Block Diagram of MPT Rectenna Power Conversion Power Regulator Remote Device Receiving Side: This converts the microwave power signal to DC power signal This regulates DC voltage level Remote Device uses this DC power the same way it uses a battery
  • 15.  LASER is highly directional, coherent  Not dispersed for very long  But, gets attenuated when it propagates through atmosphere  Simple receiver  Photovoltaic cell Cost-efficient
  • 16.  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
  • 17. Near-field energy transfer  Electric automobile charging Static and moving  Consumer electronics  Industrial purposes
  • 18. 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
  • 19.  “Wireless Power Transmission”, Vol No.- 45, Electronics For U –August-2013 Peter Vaessen,” Wireless Power Transmission”, Leonardo Energy, September 2009  C.C. Leung, T.P. Chan, K.C. Lit, K.W. Tam and Lee Yi Chow, “Wireless Power Transmission and Charging Pad”
  • 20.  White Paper on Solar Power Satellite (SPS) Systems, URSI, September 2006  Richard M. Dickinson, and Jerry Grey, “Lasers for Wireless Power Transmission”  David Schneider, “Electrons unplugged”, IEEE Spectrum, May 2010