2. Overview
What is wireless power
transmission(WPT)?
Why is WPT?
History of WPT
Types of WPT
◦ Techniques to transfer energy wirelessly
Advantages and disadvantages
Applications
Conclusion
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References
Transmission
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3. What is WPT?
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
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Transmission
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4. Why WPT?
Reliable
Efficient
Fast
Low maintenance cost
Can be used for short-range
or long-range.
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Transmission
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5. History
Nikola Tesla in late 1890s
Pioneer of induction techniques
His vision for “World Wireless System”
The 187 feet tall tower to broadcast
energy
He managed to light 200 lamps from a
distance of 40km
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Transmission
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6. Energy Coupling
The transfer of energy
◦ Magnetic coupling
◦ Inductive coupling
Simplest Wireless Energy coupling is
a transformer
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Transmission
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7. Inductive coupling
Primary and secondary coils are not
connected with wires.
Energy transfer is due to Mutual
Induction
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10. Description of diagram
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Transmission
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Works on the principle of inductive
coupling
Contains two sections-The
Transmitter section and the Receiver
section
Transmitter coil converts the DC
power to high frequency AC signal
Receiver coil receives the power and
convert it into AC signal
12. Transmitter Section
Description
DC power Source: It consists of a step
down transformer that step downs the
supply voltage to a desired level, and
a rectifer circuit convert that AC voltage to
DC signal
Oscillator Circuit: A modified Royer
Oscillator circuit is used in our project. With
this circuit we can easily achieve a high
oscillating current for the transmitter coil.
Two N channel enhancement power
MOSFET are 11/2/used
14 Wireless Power
Transmission
Two chokes (L1 & L2) are used
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13. Transmitter Section (cont…)
the transmitter coil L(inductor)
resistors R1,R2,R3 and R4 (works as
a biasing network for Q1&Q2)
The operating frequency of the
oscillator is determined by the
resonance formula given below
F = ½ × π × √ (LC)
The equation for finding the
inductance 11/2/of 14 a single Wireless layer Power
air core
coil is given below.
Transmission
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15. Reciver Section Description
consists of receiver coil
rectifier circuit and a voltage
regulator IC.
The rectifier circuit in the receiver
section converts this AC voltage in to
DC
Voltage control IC helps to provide a
constant limited regulated output
voltage to the load for charging
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Transmission
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16. Recevier section (cont….)
LM 7805 voltage regulator IC is used
The IC gives a regulated 5V as its
output
It don’t allow more than 5V to the
output.
Copper wire having diameter of 8cm
is used.
equation for finding the inductance of
a single layer 11/2/14 air core Wireless coil is Power
given
below
Transmission
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17. Advantages of near-field
techniques
No wires
No e-waste
Need for battery
is eliminated
Efficient energy
transfer using RIC
Harmless, if field
strengths under
safety levels
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Transmission
Maintenance cost
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18. Disadvantages
Distance constraint
Field strengths have to be under
safety levels
Initial cost is high
In RIC, tuning is difficult
High frequency signals must be the
supply
Air ionization technique is not feasible
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Transmission
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19. 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 11/2/14 globWalilryel e(sins Pfuowtuerr e)
Transmission
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20. 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
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21. References
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
11/2/14 Wireless Power
C.C. Leung, T.P. Chan, Transmission
K.C. Lit, K.W.
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