The seminar presentation discussed wireless power transmission using WiTricity technology. There are three types of wireless power that differ in range and transfer method: short range uses inductive coupling, medium range uses resonant induction, and long range uses electromagnetic waves. WiTricity provides wireless power transfer through resonant magnetic fields that can penetrate obstacles and is safe for living beings. The technology could make devices more convenient by eliminating power cords and batteries, and more environmentally friendly by reducing disposable battery usage.

1. SEMINAR
PRESENTATION
ON

3. Electricity without wires
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4.  In 1899, Sir Nikola
Tesla Proposed a
method of Wireless
Power
Transmission.
 As it is in Radiative
mode, most of the
Power was wasted
and has less
efficiency.
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5. The idea of wireless
electricity has been
around since the
early days of the
Tesla coil. But thanks
to a group of MIT
scientists, team led
by Marin Soljačić
and named it
"WiTricity"
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7. There are 3 major types , each with
different ranges, methods of transfer
– Short range: Inductive Coupling
– Medium range: Resonant Induction
– Long range: Electromagnetic Wave
Power Transfer
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8. Magnetic coupling occurs when two
objects exchange energy through
their varying or oscillating magnetic
fields. Resonant coupling occurs when
the natural frequencies of the two
objects are approximately the same.
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12.  There are witricity power sources(transmitter) and
capture devices(receiver).
 Power source provides power to the devices where
as capture device captured it to work.
 Power source and capture devices are specially
designed ‘‘strongly-coupled’’ resonators for
midrange wireless non-radiative energy transfer
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13. Highly Resonant Strong Coupling
Provides High Efficiency Over Distance
Energy Transfer via Magnetic Near Field
Can Penetrate and Wrap Around
Obstacles
 Non-Radiative Energy Transfer is Safe for
People and Animals
 Flexible Geometry Allows WiTricity
Devices to be Embedded Into Different
Products
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14. It will make products :
• More Convenient:
-No manual recharging or changing batteries.
-Eliminate unsightly, unwieldy and costly power cords.
• More Reliable:
-Never run out of battery power.
• More Environmentally Friendly:
-Reduce use of disposable batteries.
-Use efficient electric ‘grid power’ directly instead of
inefficient battery Charging.
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15.  Safe, fairly efficient, good range
 Boon for the devices which uses
midrange power
 No need of line of sight.
 No need of power cables and batteries.
 Magnetic fields interact weakly with
biological masses (humans), and energy
is only transmitted between resonating
objects
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16.  Transmissions possible only in few meters
 Possibility of “energy theft”
 Efficiency decreases with distance
 The resonance condition should be
satisfied and if any error exists, there is no
possibility of power transfer.
 It can not penetrate through METAL
WALL
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18.  Direct Wireless Power—when all the power a
device needs is provided wirelessly, and no
batteries are required. This mode is for a device
that is always used within range of its WiTricity
power source.
 Automatic Wireless Charging—when a device with
rechargeable batteries charges itself while still in
use or at rest, without requiring a power cord or
battery replacement. This mode is for a mobile
device that may be used both in and out of range
of its WiTricity power source
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19.  Consumer electronics
 Transportation
 Industry applications
 Other applications
› Medical devices
› Military applications
› Robots
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20. Witricity’s Technology Technology Benefit
Highly resonant strong coupling High efficiency over distance
Energy transfer via magnetic
Can penetrate and wrap
near field
around obstacles
Non radiative energy transfer Safe for living beings and other
environmental objects
Scalable design From Mw to kW
Flexible geometry Device that can fit into OEM
(original equipment
manufactures)products
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21.  Will it harm me?
 Will it harm the environment?
 Will it interfere with important
communication?
NO
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