The document discusses wireless power transmission, outlining its principles, history, types (including inductive and microwave power transmission), and its applications in industries such as automotive and medical. It highlights the advantages of wireless systems, such as reduced power loss and increased efficiency, while also mentioning limitations like distance constraints and initial costs. Additionally, it references advancements and projects related to the technology, like Qualcomm Halo for electric vehicle charging.

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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
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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
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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
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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
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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
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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
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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
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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.
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Project Prototype
Transmitter Receiver
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Functional Block Diagram
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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
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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
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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
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Applications
Medical Industry - Maglense
▶ Wireless charging of medical implants.
▶ Flexible, efficient and safe.
▶ No heating issues [5].
Maglense belt
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Applications
Commercial Application - WiTricity
Wireless mobile Charger
Wireless laptop Charger [6]
Wireless Television
Wireless Charger for E-Toothbrush
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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.
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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.
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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