12-04-2010, 11:21 AM
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WIRELESS Power TRANSMISSION
WIRELESS SYSTEM
Presented By:
MD SHAHID KHAN
V.BHAGVAN NAIK
4TH Year B.Tech EEE 2ND Sem
INTRODUCTION
The term wireless transmission stands for interchange of power, electricity, data or any other type of information.
According to the electrical point of view, transmission lines are used for transmitting power supply.
But there is a major risk of electrical hazards like short circuits, power failure, & breakdown of transmission lines.
So, we have suggested an innovative idea to overcome all these electrical hazards.
JUST REMOVE THE TRANSMISSION LINES !
For this, we have used microwaves .
WHAT ARE MICROWAVES ?
we are very familiar to microwave ovens.
We have implemented the principle of microwave ovens for our receivers & transmitters.
Microwaves have wavelengths approximately in the range of 30 cms (freq= 1 GHz ) to 1 mm (freq= 300 GHz ).
The term microwaves generally refers to A.C. signals with frequencies between 300 MHz & 300 GHz.
The microwave range includes ultra high frequencies ( 0.3-3 GHz ), super high frequencies (3-30 GHz ), & extremely high frequencies (30-300 GHz ) signals.
We have used these microwaves for our wireless transmission.
HOW IT WORKS ?
Here, the power (electricity) generated at sub-station goes to the transmitter, which works like the principle of microwave oven
This transmitter converts the electricity into microwaves & transmit them to our service towers
When these transmitted waves reach at the desired tower, (HOME TOWER), the receiver of home tower receives these microwaves & converts them into electricity.The electricity is utilized for our home appliances.
MPT METHOD
MICROWAVE POWER TRANSMISION ( MPT ) method is the use of microwaves to transmit power through outer space or the atmosphere without the need for wires.
In 1964, William C. Brown demonstrated a miniature helicopter equipped with a combination antenna & rectifier called as rectenna.
The rectenna converted microwave power into electricity , allowing the helicopter to fly.
In principle, rectenna is capable for very high conversion efficiencies“ over 90% in optimal circumstances.
Most proposed MPT systems includes a phased array microwave transmitter.
They have advantage of being electrically steered and easier to scale the necessary levels that a practical MPT system requires.
Wireless switching
Now further we can use the microwaves received by our home tower for wireless switching also
By using wireless switching, we can make the whole transmission wireless....from sub-station to our home appliances.
There is no need of electrical wires to control our electric home appliances like fans, tube lights, washing machines etc¦
How wireless switching works ?
for wireless switching, we use a TRANSCIEVER, a combo of transmitter & receiver, in our home tower.
This receives & transmits the microwaves directly to the transceiver of our hand held remote control.
Now we can control our home appliances by operating this hand-held remote control
Now the microwaves transmitted by this remote control are received by the receiver of our home appliance.
And thus, we can control our home appliances wirelessly.
SOME TECHNICAL DATA
Here we can use microwaves having frequency of 4 to 8 GHz , which is very well known as the C-band of microwave spectrum.
By using this frequency, the microwaves at our service tower can cover the area of approximately 4 to5 Kms.
So, here we can put our service towers at large distance & we can transmit power with less power loss compare to other transmission methods.
And microwave have efficiency over 90% as proven by the researches held at Reunion islands, Indian Oceans.
