Hassan Azimi

WIRELESS ENERGY TRANSFER

OVERVIEW

• What is wireless power transmission /wireless energy transfer?

• What is WPT?

• The beginning

• Techniques to transfer energy wirelessly

• Advantage and disadvantage

• Applications

• Conclusion

WHAT IS WPT?

• The transmission of energy from one place to another without using wires.

• Conventional energy transfer is using wires. But, the wireless transmission is made possible by using various technologies.

• Ideal for continuous or instantaneous supply of electricity.

THE BEGINNING OF WIRELESS

• Devices almost in contact with the charger

• The range covers a few meters.

• There are 3 types of:o Rear-Field

o Resonant Induction

o Far-Field

TECHNIQUES

• Rear field techniques:

• Inductive Coupling

• Resonant Inductive Coupling

• Air Ionization

• Far field techniques:

• Microwave Power Transmission (MPT)

• Laser Power Transmission

ADVANTAGE OF NEAR-FIELD TECHNIQUES

• No wires

• No electrical waste

• Need for battery is eliminated

• Harmless, if field strengths under safety level

• Maintenance cost is less

• Efficient energy transfer

DISADVANTAGES

• Distance constraint

• Field strengths have to be under safety levels

• Initial cost is high

• High frequency signals must be the supply

• Air ionization technique is not feasible • http://en.wikipedia.org/wiki/Wireless_energy_transfer

LASER VS. MPT

• In LASER use the antenna size can be much smaller

• Microwave can face interference

• LASER has high attenuation loss and also it gets diffracted by atmospheric particles easily

ADVANTAGE OF FAR-FIELD ENERGY TRANSFER

• Efficient

• Easy

• Need for grids, substations etc are eliminated

• Low maintenance cost

• Can reach the places which are remote

• More effective when the transmitting and receiving are along a line-of-sight

DISADVANTAGES

• Radiative

• Needs line-of-sight

• Initial cost is high

• When LASERs are usedo Conversion is inefficient

o Absorption loss is high

• When Microwaves are used:o Interference may arise

o FRIED BIRD effect

APPLICATIONS

• Near-field energy transfer:o Electric automobile charging

o Consumer electronics

o Industrial proposes

o Environment proposes

• Far-field energy transfer:o Solar power satellite

o Energy to remotes areas

o CAN BRODCASR ENERGY GLOBALY (in future)

CONCLUSION

• Transmission without wires- a reality

• Efficient

• Low maintenance cost, but high initial cost

• Better than conventional wired transfer

• Energy crises can be decreased

• Low loss

• In the future, world will be completely wireless

THANK YOU