Submitted by:Shuvo Saha RoyDept: EEE,KUETRoll: 1003008Year:4th Term:1st Date:19-08-2014

Overview

Wireless power transmission(WPT)

Why WPT

Microwave Transmission

Microwave vs. laser transmission

Rectenna

Solar power Satellite

Current Developments

Advantages of WPT

Disadvantages of WPT

Applications

Microwave vs. Laser Transmission

Microwave Transmission

More developed High efficiency up

to 85% Beams are far below

the lethal levels of concentration even for a prolonged exposure

Causes interference with satellite communication industry

Laser Transmission

Recently developed solid state lasers allow efficient transfer of power

Range of 10% to 20% efficiency within a few years

Conform to limits on eye and skin damages

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

Solar power satellite(SPS) 1968’s idea for Solar power Satellites proposed by

Peter Glaser Would use microwaves to transmit power to earth

from space To efficiently make use of renewable energy i.e.

solar energy Solar powered satellites are placed in geostationary

orbits Solar power from the satellite is sent to earth using

a microwave transmitter Received at a “Rectenna” located on Earth

Architecture of Solar power Satellite(SPS)

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 Waste heat is radiated back into space Power can be beamed to the location where it is

needed, don’t have to invest in as large a grid No air or water pollution is created during generation

Current Development

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

10MW satellite delivering microwave power

Will not be in geosynchronous orbit , instead lower orbit 1100 km (683 miles)

Much cheaper to put a satellite in a low orbit

200 seconds of power on each pass over rectenna

Advantages of WPT

Efficient

Easy

The power could be transmitted to the remote places where the wired transmission is not possible

Need for grid, high tension transmission lines, substations are eliminated

Low maintenance cost

Power theft would be not possible at all

The power failure due to short circuit and fault on cables would never exist in the transmission.

The cost of transmission and distribution would become less

The cost of electrical energy for the consumer would be reduced also

Wireless charging would also possible

Vehicles would be driven using WPT, no need of fuel.

Disadvantages of WPT

Cost for practical implementation of WPT seems to be very high.

The other disadvantage of the concept is interference of microwave with present communication systems.

Applications of WPT

Solar Power Satellites (SPS) Moving targets such as fuel free airplanes,

fuel free electric vehicles, moving robots and fuel free rockets

Ubiquitous Power Source (or) Wireless Power Source

Wireless sensors RF Power Adaptive Rectifying Circuits (PARC)

Thank You All