The end of plug?

WIRE LESS ELECTRICITY

PRESENTED BY K.AJAY KUMAR

1) History of Wireless power.

2) Need of Witricity.

3) Basic Principle.4) Inductive & resonance coupling

5)Advantages & Limitation6)Applications on various fields7)Conclusions

History of Wireless Power

•In 1899, Sir Nikola Tesla Proposed a method of Wireless Power Transmission.• As it is in Radiative mode, most of the Power was wasted and has less efficiency.• The efficient midrange power transfer concept is Witricity. In this model source and load are in Magnetic resonance so there is no power loss.

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. The transfer of energy is mid range compared to direct transmission.

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 i.e., witricity would be useful for many applications as these things need mid range energy.

Working 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 fieldMagnetic vector notation

dB=udH

Induced EMF due to change in flux

– Short range: Inductive Coupling

– Medium range: Resonant Induction

– Long range: Electromagnetic Wave Power Transfer

There are 3 major types , each with different ranges, methods of transfer

HOW DOES RESONANT INDUCTION WORKS

Same principles as magnetic induction, but uses resonance to increase the range.Everything resonates at a certain frequency, based on its shape and material.Energy transfers easily between resonating objects. With resonant induction, power is transmitted between two resonating coils.

RESONANT MAGNETIC COUPLING

Magnetic coupling occurs when two objects exchange energy through their varying or oscillating magnetic fields. Resonant coupling occurs when the natural frequencies of the two objects are approximately the same.

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 etc resonates at same frequency as first coil and absorbs energy.5. Energy charges the device.

Block diagram of a wireless energy transfer system.

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.

Limitations

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.

Technology Benefits and Applications

ANY QUERIE

S?