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)

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THANK YOU..Please feel free for any questions...