Wireless power transmission involves transferring electricity without wires using magnetic field resonance. Nikola Tesla conducted early experiments in the late 19th/early 20th century, transmitting power over short distances. It works by generating oscillating magnetic fields from one coil connected to a power source which induces a current in a nearby coil connected to a device. Known as inductive coupling, it relies on the coils having near identical resonant frequencies. Potential advantages include reducing e-waste by eliminating power cords and enabling power delivery in any direction. Safety is ensured as magnetic fields pass harmlessly through living tissues. Future applications could include powering devices over longer ranges including wireless charging of electric vehicles.

1. Wireless Power Transmission
Presented By
K .Balasriram
EEE DEPARTMENT

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Contents
History
What is wireless power transmission
How it work’s
Working principle of witricity
Inductive coupling
Advantages
Safety
Future scope

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History
Nikola Tesla

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Inventor Nikola Tesla performed the first experiments in
wireless power transmission at the turn of the 20th
century, and may have done more to popularize the idea
than any other individual.
In the period 1891 to 1904 he experimented with spark-
excited radio frequency resonant transformers, now
called Tesla coils, which generated high AC voltages on
elevated capacitive terminals.With these he was able to
transmit power for short distances without wires.

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What is wireless power transmission
Transfer of electricity without using connections
between input and load is termed as wireless
electricity.
This is not like wireless transmission of signals
which we used in the cell phones.
In cell phones signals are sent in the form of
micro waves whereas in this mode of transition
electricity is transferred in the form of magnetic
waves.

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How it works
Resonant Magnetic Coupling: when two objects exchange
energy through their varying or oscillating magnetic fields. -
Natural frequencies of the two objects are approximately the same.

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Working principle of witricity
Witricity works on the principle of mutual induction between the
two coils.
There are two copper coils arranged one at the sender end and
other at the receiver end .The first coil is attached to the power
source while the second coil to the light bulb.
When the power is switched on the first coil converts the
electricity into magnetic field ,which is oscillating at a particular
frequency i.e, AC source.
The second coil at the receiver end converts the magnetic field into
electricity .The surrounding environment is unaffected.
WiTricity is based on strong coupling between electromagnetic
resonant objects to transfer energy wirelessly between them.

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Inductive coupling

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Example

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Showing how it is working

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Advantages
An advantage is that we can produce electricity
anywhere without wires.
The power can be delivered in any direction i.e,
omnidirectional.
Most common things in our surroundings do not interact
with these magnetic fields and thus not harmful to other
living beings
Reduction of e-waste by eliminating the need for power
cords.
Cost of conductor and size of conductor will decreases.

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Safety
Any living organisms that are placed in between the two
coils(transmitter &emitter) will not halt or hinder the
transmission of magnetic field.
It is because the magnetic rays will not interact with the
living tissues so strong and can be easily passed through
the humans or other living organisms.

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Future scope

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Thank you