Date post: | 05-Jan-2016 |
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Supervisor: Falah Mahmmoud
Brief History about WPT.*The first existence was in 1990
by Nickola Tesla.*Wireless power transmission
with microwaves by Brown in 1960.
*Developing Rectenna which make it to succeed in MPT in1964.
*In 1980’s Japanese began their researches in this subject.
*In 1987 Canadian group succeeded fuel-free airplane flight experiment with MPT called SHARP.
*after 1995 Japanese and European developed many technologies
Why Wireless Power Transmission??•It is much better than disposal batteries.•Simply, wires are noisy!•Convenience•Reduces clutter in workspaces, homes, etc.•Variety of Applications
What about safety??• Non-radiative power transfer uses magnetic
near field.• Magnetic fields are safe for people and
animals.• Highly resonant coupling minimizes energy
transfer to “off – resonant” objects.• WiTricity systems are designed to meet int’l
safety guidelines.
How Wi tricity technology work?? AC power is supplied at the system operating
frequency
The inductor and capacitor are chosen so that they resonate at the operating frequency, creating a much larger magnetic field
By placing a resonant receiver within the magnetic field, a resonant circuit is created
This resonant circuit allows the system to pass voltage and current to the receiver over significant separation distance
Requirements of our project.Transmit power wirelessly at least 20 inches
Produce 5-V / 10W output to receivers
Transmission frequency should be greater than
2MHz
System must utilize Magnetic Induction
Primary side must plug into a wall outlet
Must charge a device
(Sub-project) Must have testing device
Design ComponentsTransmission
Side
Power Source
Power Processing
Wireless Channel
Sending
Receiving
Receiving Side
Power Processing
Output Power
Full System SchematicSource Side
8
Transmission Side
DC- Source
10-24 v
Collpit Oscillator
Power Amplifier
Primary Coil
Collpitts Oscillator*Directly connected to power source
* Creates output AC signal at designed frequency.
*.Extremely robust
* Directly connected to amplifier.
Collpitts ComponentsComponents Value Quantity
Variable Inductor 0.1 - 100 μH 1Capacitors 100pF 2Resistors 50 /2.2k/ 10k 4
http://www.biocrawler.com/w/images/f/f6/NPN_Colpitts_oscillator_collector_coil.png
Power Amplifier.*Collpitts Oscillator provides small signal input
* Can provide at least 30W output for 5-10MHz frequency
* Directly Connected to single winding primary coil
Oscillator circuit and class D power amplifier:
The output is pure sinusoidal signal:
Another choice:High output power signal circuit:
-In the circuit shown here you can create high frequency electromagnetic waves with very high output power.
-The frequency Range from 200kHz to 10MHz was generated using this coil.
This was the output of the previous circuit:
Wireless Channel
Our attempts in building the coils:
Transmission Coil
Receiving Coil
These were the certified coils:
Receiving Side:
SecondaryCoil
Full-Wave Rectifier
Voltage Regulator
Charger (Optional)
Full wave Rectifier: -Will be directly connected to single winding secondary coil.
-Rectifier must handle MHz frequency and up to 15W
http://upload.wikimedia.org/wikipedia/commons/c/cc/Gratz.rectifier.en.png
Voltage Regulator:-Will connect directly to rectifier.
-Will provide 10W 5V dc output for charging device.
•Input Voltage: 3V to 30V• Output Voltage: 1.25 to 13V• Output Power: 10W• Output Amp: 1.5A (Not over 10W)
http://www.robotshop.us/dimension-engineering-de-swadj-1.html?
utm_source=google&utm_medium=base&utm_campaign=jos
THANK YOU..Please feel free for any questions...