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Wireless Power TransmissionPresented by

Shubham Jain0809010094Department of Computer Science EngineeringIEC College of Engineering and Technology, Gr.Noida

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Overview What is wireless power transmission(WPT)? Why is WPT? 1940’s to Present Microwave transmission Rectenna Applications Space-based solar power SPS 2000 Advantages Conclusion References

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What is WPT? The transmission of energy from one place

to another without using wires Conventional energy transfer is using wires As per studies, most electrical energy

transfer is through wires. Most of the energy loss is during

transmission• On an average, more than 30%• In India, it exceeds 40%

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Why WPT?

ReliableEfficientFastLow maintenance costCan be used for short-range or long-range.

1940’s to Present

World War II developed ability to convert energy to microwaves using a magnetron, no method for converting microwaves back to electricity

1964 William C. Brown demonstrated a rectenna which could convert microwave power to electricity

Microwave transmission

Microwave transmission refers to the technology of transmitting information by the use of radio waves whose wavelengths are conveniently measured in small numbers of centimeters; these are called microwaves.

This part of the radio spectrum ranges across frequencies of roughly 1.0 gigahertz (GHz) to 30 GHz.

These correspond to wavelengths from 30 centimeters down to 1.0 cm.

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Microwave Power Transfer(MPT) Cont.

Transfers high power from one place to another. Two places being in line of sight usually

Steps: Electrical energy to microwave energy Capturing microwaves using rectenna Microwave energy to electrical energy

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MP T (cont.…) AC can not be directly converted to

microwave energy AC is converted to DC first DC is converted to microwaves using

magnetron Transmitted waves are received at

rectenna which rectifies, gives DC as the output

DC is converted back to AC

Rectenna

“An antenna comprising a mesh of dipoles and diodes for absorbing microwave energy from a transmitter and converting it into electric power.”

Microwaves are received with about 85% efficiency.

Around 5km across (3.1 miles)95% of the beam will fall on the

rectenna.

5,000 MW Receiving Station (Rectenna). This station is about a mile and a half long in US.

Applications

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Space-based solar power 1968’s idea for Solar Power Satellites

proposed by Peter Glaser Would use microwaves to transmit power to

Earth from Solar Powered Satellites To efficiently make use of renewable

energy i.e., solar energy Solar Powered Satellites are placed in

geostationary orbits

From the Satellite

Solar power from the satellite is sent to Earth using a microwave transmitter

Received at a “rectenna” located on Earth

Possible Designs

Advantages over Earth based solar power More intense sunlight In geosynchronous orbit, 36,000 km

(22,369 miles) an SPS would be illuminated over 99% of the time

No need for costly storage devices for when the sun is not in view Only a few days at spring and fall equinox

would the satellite be in shadow

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Other projects Alaska’21

Grand Bassin Hawaii

Current Developments

SPS 2000

Details

Project in Development in Japan

Goal is to build a low cost demonstration model by 2025

8 Countries along the equator have agreed to be the site of a rectenna

Continued

10 MW satellite delivering microwave power Will not be in geosynchronous orbit,

instead low orbit 1100 km (683 miles)

Much cheaper to put a satellite in low orbit

200 seconds of power on each pass over rectenna

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Advantages of Wireless energy transfer Efficient Easy Need for grids, substations etc are

eliminated Low maintenance cost More effective when the transmitting

and receiving points are along a line-of-sight

Can reach the places which are remote

Conclusions

More reliable than Traditional power In order for WPT to become a reality it

several things have to happen: Government support Cheaper launch prices Involvement of the private sector

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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

Contact:

Shubham JainEmail: shubh000007@gmail.com

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THANK YOU!