The document discusses wireless power transmission (WPT), highlighting its importance, historical background, types, technologies, advantages, disadvantages, and applications. It details techniques such as inductive coupling, microwave power transmission, and solar power satellites while emphasizing the efficiency and low maintenance costs of WPT compared to conventional wired methods. The conclusion suggests that while initial costs are high, WPT may effectively address energy crises in the future.

1. DEPARTMENT OF ELECTRONIC AND
COMMUNICATION ENGINEERING
WIRELESS POWER TRANSMISSION
Name:- MOHD MOHSIN
Roll No:- 1609731055
Year:- 2020

2. CONTENT
 Introduction
 Why is WPT?
 History of WPT
 Types of WPT
 Techniques to transfer energy wirelessly
 Advantages and disadvantages
 Applications
 Conclusion
 References

3. INTRODUCTION
 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%

4. Why WPT ?
 Reliable
 Efficient
 Fast
 Low maintenance cost
 Can be used for short-range or long range.

5. History
 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 nonoperation He used to lamp 200
lights from 40 km distance
Fig.1Tesla Wardencyffe project achive [1]

6. Types and technologies of WPT
 Near-field techniques
 Inductive Coupling
 Resonant Inductive Coupling
 Air Ionization
 Far-field techniques
 Microwave Power Transmission (MPT)
 LASER power transmission

7. Energy coupling
 The transfer of energy
 Magnetic coupling
 Inductive coupling
 Simplest Wireless Energy coupling is a transformer
Fig.2 Transformer [2]

8. Inductive coupling
 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.
Fig.3 Inductive coupling [3]

9. Resonance inductive coupling (RIC)
 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
Fig.4 Block diagram of RIC [4]

10. How resonance in RIC
 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 negligeibe

11. Air Ionization
 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
Fig.5 Air Ionization [6]

12. Microwave Power Transfer(MPT)
 Transfers high power from one place to another. Two places being in line of sight
usually
 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
 Transmitted waves are received at rectenna which rectifies, gives DC as the output
 DC is converted back to AC

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

14. Solar Power Satellites (SPS)
 To provide energy to earth’s increasing energy need
 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

15. Advantages
 No wires
 No Energy-waste as compared to dumped used batteries
 Need for battery is eliminated
 Maintenance cost is less

16. Disadvantages
 Initial cost is high
 In RIC, tuning is difficult(L & C Values for Resonance)
 Air ionization technique is not feasible( small distance, High voltage, )
 Distance constraint

17. The Qi Standard
 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 receive

18. Applications
 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)

19. Conclusion
 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

20. References
 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

21. References(cont.)
 André Kurs, Aristeidis Karalis, Robert Moffatt, J. D. Joannopoulos, Peter
Fisher and Marin Soljačić, “Wireless Power Transfer via Strongly Coupled
Magnetic Resonances”, Science, June 2007
 T. R. Robinson, T. K. Yeoman and R. S. Dhillon, “Environmental impact of
high power density microwave beams on different atmospheric layers”,
 White Paper on Solar Power Satellite (SPS) Systems, URSI, September
2006
 Richard M. Dickinson, and Jerry Grey, “Lasers for Wireless Power
Transmission”
 S.S. Ahmed, T.W. Yeong and H.B. Ahmad, “Wireless power transmission
and its annexure to the grid system”

22. References(cont.)
 S. Sheik Mohammed, K. Ramasamy, T. Shanmuganantham,” Wireless power
transmission – a next generation power transmission system”, International
Journal of Computer Applications (0975 – 8887) (Volume 1 – No. 13)
 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”
 David Schneider, “Electrons unplugged”, IEEE Spectrum, May 2010
 Shahrzad Jalali Mazlouman, Alireza Mahanfar, Bozena Kaminska, “Mid-range
Wireless Energy Transfer Using Inductive Resonance for Wireless Sensors”

23. THANK YOU!