The document discusses wireless charging circuit using inductive coupling. It describes how wireless power transmission works through inductive coupling without wires by using a primary coil in the transmitter and a secondary coil in the receiver. Energy is transferred through mutual induction between the two coils. The transmitter section uses an oscillator circuit to convert DC to high frequency AC which is then transmitted through the coil. In the receiver section, the coil receives power and a rectifier circuit converts it back to DC to charge the load.

1. Wireless Charging Circuit
Using Inductive Coupling
BY:-
Siddhant Singh

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
Conclusion11/2/14 Wireless Power
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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6. Energy Coupling
The transfer of energy
◦
Magnetic coupling
◦
Inductive coupling
Simplest Wireless Energy coupling is
a transformer
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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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8. An example
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9. Block Diagram of circuit
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10. Description of diagram
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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

11. Transmitter Section
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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 used11/2/14 Wireless Power
Transmission
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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 of a single layer air core11/2/14 Wireless Power
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14. Recevier Section
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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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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 air core coil is given11/2/14 Wireless Power
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 levels11/2/14 Wireless Power
Transmission
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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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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 globally (in future)11/2/14 Wireless Power
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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 200911/2/14 Wireless Power
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22. THANK YOU!
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