The wireless power transmission is a great technology that has long history. It has more potential in the near future in various industrial as well as commercial applications.

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WIRELESS POWER TRANSMISSION
THE FUTURE OF POWER TRANSMISSION
S. KAVINCHAKKARAVARTHI 𝟏
Skavin005@gmail.com
BA. BARANI GOWTHAM 𝟐
babaranigowtham@gmail.com

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Transmission Lines
Transmission lines
WIRELESS POWER TRANSMISSION

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Electricity in India
Power utility in India - 2012 Power utility in India - 2016
▶ As of 2012 – 199.6 GW.
▶ As of 2016 – 307.28 GW.
▶ As of 2019 – 360.788 GW [7].
WIRELESS POWER TRANSMISSION

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Wires
 Transfers power to a device.
 Resistive element.
 Reason for 30% loss in transmission lines.
Wires
WIRELESS POWER TRANSMISSION

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Wireless Power
▶ Transmission of power from one place to
another without using wires.
MAGNETIC FIELD
AC POWER
Wireless Power Transfer
WIRELESS POWER TRANSMISSION

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Principle of Working
Faraday’s law of electromagnetic induction
• When a magnetic flux linking a circuit changes, an EMF is induced
in the circuit.
• The magnitude of induced EMF is proportional to the rate of
change of the flux linkage.
Michael Faraday
WIRELESS POWER TRANSMISSION

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History
• Demonstrated resonant inductive coupling at 1894.
• Power is transmitted to an incandescent lamp without
wires.
• Transmitter is tuned to match the resonant frequency of
the receiver coil.[1]
• Maximum energy transfer.
Nikola Tesla
Nikola Tesla
Resonance coupling
WIRELESS POWER TRANSMISSION

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Types of Wireless Power Transfer
• Two types,
1. Near field transmission
 Inductive coupling
 Resonant inductive coupling
2. Far field transmission
▪ Microwave power transmission
MAGNETIC FIELD
AC POWER
Wireless Power Transfer
WIRELESS POWER TRANSMISSION

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Inductive Coupling
• Consist of tow coils namely primary and
secondary coils.
• Inductive coupling between two coils used to
transmit power.
• Efficient for short distance power transmission.
Inductive Coupling
WIRELESS POWER TRANSMISSION

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Resonant Inductive Coupling
• Resonance is a tendency of a system to oscillate
with large amplitude at certain frequency.
• Two systems having same resonance tend to
exchange energy between them.
• Maximum energy transfer happens at strongly
coupled resonance frequencies [2].
• Can transfer power for few meters.
Resonant Inductive Coupling
WIRELESS POWER TRANSMISSION

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Microwave Power Transmission
• Microwave is generated at high frequencies of value
2.45GHz or 5.4GHz.
• Consist of transmitting slotted waveguide antenna
and rectenna.
• Rectenna is a passive element consist of antenna
and rectifiers [3].
• Long distance power transfer.
Slotted waveguide antenna
WIRELESS POWER TRANSMISSION

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Our Project
• Based on Inductive Resonance Coupling.
• Transfers power efficiently for distance up to 15cm.
• Consist of two modules namely transmitter and receiver.
WIRELESS POWER TRANSMISSION

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Project Prototype
Transmitter Receiver
WIRELESS POWER TRANSMISSION

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Functional Block Diagram
WIRELESS POWER TRANSMISSION

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Applications
Automotive Industry
▶ Charging of EVs using resonance inductive
coupling.
▶ Power transmitters attached at parking lot.
▶ Automatically charges the EV.
Wireless EV charging station
WIRELESS POWER TRANSMISSION

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Applications
Automotive Industry – Qualcomm HALO
▶ Future of EV charging.
▶ Stationary wireless EV charging station.
▶ Park and charge.
▶ Efficient power transfer.
Qualcomm HALO charging pad
WIRELESS POWER TRANSMISSION

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Applications
Automotive Industry – Qualcomm HALO
▶ Power is transferred wirelessly from a
ground based charging pad.
▶ Roads integrated with transmitters can
charge EVs while moving [4].
Charging of EV
Roads integrated with wireless chargers
WIRELESS POWER TRANSMISSION

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Applications
Medical Industry - Maglense
▶ Wireless charging of medical implants.
▶ Flexible, efficient and safe.
▶ No heating issues [5].
Maglense belt
WIRELESS POWER TRANSMISSION

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Applications
Commercial Application - WiTricity
Wireless mobile Charger
Wireless laptop Charger [6]
Wireless Television
Wireless Charger for E-Toothbrush
WIRELESS POWER TRANSMISSION

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Advantages
▶ No need of wires.
▶ Reduces power loss due to the resistance of wires.
▶ Reduces distribution and transmission cost.
▶ Can be embedded in portable devices.
▶ More efficient than wired power transmission.
▶ It is safe for humans and animals.
WIRELESS POWER TRANSMISSION

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Disadvantages
▶ Distance of transmission is limited.
▶ Resonance frequency should be maintained at
same level for maximum energy transfer.
▶ Initial cost for constructing the facility will be high.
WIRELESS POWER TRANSMISSION

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References
[1] Tesla, N., “The transmission of electric energy without wires”, Electrical World, March 5,
1904.
[2] T. P. Duong, and J. W Lee, “Experimental Results of High-Efficiency Resonant Coupling
Wireless Power Transfer Using a Variable Coupling Method,” IEEE Microwave and Wireless
Components Letters, vol.21, no.8, pp.442-444, Aug.
[3] Mc Spadden, J. O., L. Fun, and K. Chang, “A High Conversion Efficiency 5.8 GHz Rectenna”,
IEEE MTT-S Digest, 1997, pp.547-550.
[4] https://www.qualcomm.com/news/onq/2017/05/18/wireless-dynamic-ev-charging-
evolution-qualcomm-halo
[5] https://www.cambridgeconsultants.com/maglense
[6] https://witricity.com/technology/
[7] http://www.makeinindia.com/article/-/v/power-sector-achievement-report
WIRELESS POWER TRANSMISSION