Wireless mobile charging by Inductive Coupling.
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Transcript of Wireless mobile charging by Inductive Coupling.
Wireless Charging Circuit Using Inductive Coupling
BY:-Siddhant Singh
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
References 11/2/14 Wireless Power
Transmission2
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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Why WPT?
ReliableEfficientFastLow maintenance costCan be used for short-range
or long-range.11/2/14 Wireless Power
Transmission4
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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Energy Coupling
The transfer of energy◦ Magnetic coupling
◦ Inductive coupling
Simplest Wireless Energy coupling is a transformer
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Inductive coupling
Primary and secondary coils are not connected with wires.
Energy transfer is due to Mutual Induction
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An example
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Block Diagram of circuit
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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
Transmitter Section
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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 used
Two chokes (L1 & L2) are used
capacitor C (works as a resonating capacitors)
diode D1 & D2( provide cross coupled feedback)
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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 core coil is given below.
L = 0.001 N2 (a/2)2 / (114a + 254l) H
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Recevier Section
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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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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 given below
L = 0.001 N2 (a/2)2 / (114a + 254l) H
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Advantages of near-field techniquesNo wires
No e-waste
Need for battery is eliminated
Efficient energy transfer using RIC
Harmless, if field strengths under safety levels
Maintenance cost is less
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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 feasible11/2/14 Wireless Power
Transmission18
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 Transmission
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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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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
C.C. Leung, T.P. Chan, K.C. Lit, K.W. Tam and Lee Yi Chow, “Wireless Power Transmission and Charging Pad”
David Schneider, “Electrons unplugged”, IEEE Spectrum, May 2010
Shahrzad Jalali Mazlouman, Alireza Mahanfar, Bozena Kaminska, “Mid-range Wireless Energy Transfer Using Inductive Resonance for Wireless Sensors”
Chunbo Zhu, Kai Liu, Chunlai Yu, Rui Ma, Hexiao Cheng, “Simulation and Experimental Analysis on Wireless Energy Transfer Based on Magnetic Resonances”, IEEE Vehicle Power and Propulsion Conference (VPPC), September 3-5, 2008
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THANK YOU!
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