WITRICITY

MANISH BHARTI

B.TECH (EC) 3RD YEAR

ROLL NO:-1271931008

OVERVIEW

• What is Witricity?

• History

• Need of Witricity

• Principle of Witricity

• Working

• Advantage

• Limitation

• Safety

• Conclusion

What is Witricity?

Transfer of electricity without using connections between input and load is termed as wireless electricity.

This is not like wireless transmission of signals which we used in the cell phones.

In cell phones signals are sent in the form of micro waves whereas in this mode of transition electricity is transferred in the form of magnetic rays.

These rays are not harmful to humans.

History

• The term WiTricity was used for a project that took place at MIT, led by Marin Soljacic in 2007.

• The MIT researchers successfully demonstrated the ability to power a 60 watt light bulb wirelessly, using two 5-turn copper coils of 60 cm diameter, that were 2 m (7 ft) away, at roughly 45% efficiency and roughly 90% efficiency at a distance of 3 feet.

Need of Witricity Now-a-days there is a rapid increase of electronic goods like cell

phones ,laptops ,I-pods etc., which rely on the chemical storage of energy by the battery which need to be recharged frequently .As these are becoming daily needs to the present generation wireless energy transfer.

Principle of WitricityWitricity works on the principle of mutual induction between the two coils.There are two copper coils arranged one at the sender end and other at the

receiver end .The first coil is attached to the power source while the second coil to the light bulb.

When the power is switched on the first coil converts the electricity into magnetic field ,which is oscillating at a particular frequency i.e, AC source.

The second coil at the receiver end converts the magnetic field into electricity .The surrounding environment is unaffected.

Projecting magnetic field Induced EMF due to change in flux

WORKING OF WITRICITY

• 1. Magnetic coil (Antenna A) is housed in a box and can be set in wall or ceiling.

• 2. Antenna A, powered by mains, resonates at a specific frequency.

• 3. Electromagnetic waves transmitted through the air.

• 4. Second magnetic coil (Antenna B) fitted in laptop/TV etcresonates at same frequency as first coil and absorbs energy.

• 5. Energy charges the device.

Advantages An advantage is that we can produce electricity anywhere without wires The power can be delivered in any direction i.e, omnidirectional Most common things in our surroundings do not interact with these

magnetic fields and thus not harmful to other living beings Significant decluttering of office space No need for meter rooms and electrical closets. Reduction of e-waste by eliminating the need for power cords Need more light in your office, no need for electrician. Simply place the

lamp where ever you need it.

The flux condition should satisfy certain conditions,if not no power supply takes place.

There is a lose of power transmission if there is a strong ferro-magnetic substance.

Need for standardization and adaptation. So no overheating occurs because of different voltages.

Retrofitting old equipment or purchasing new equipment could become a very expensive endeavor.

Possibility of “energy theft”. Wi Fi, someone can be using your internet or your power.

Limitations

Safety

Any living organisms that are placed in between the two coils(transmitter &emitter) will not halt or hinder the transmission of magnetic field.

It is because the magnetic rays will not interact with the living tissues so strong and can be easily passed through the humans or other living organisms.

APPLICATION

•Wireless electricity can be used to power or recharge:

• Cell Phones

• TVs

• Computers

• Electric Cars

• Medical Devices (pacemakers, etc.)

• Military Devices (unmanned robots, planes)

• Consumer Appliances

Thank you