This document discusses wireless power transfer or witricity. It defines witricity as the transmission of energy through air without wires. There are three main techniques for wireless power transfer: inductive coupling for short ranges, resonant inductive coupling for mid ranges, and microwave transmission for long ranges. Applications discussed include using witricity to charge electric vehicles and consumer electronics. The document also provides examples of solar power satellites and large rectennas that can receive microwave power over distances.

2. IN THIS PPT…
1) What do you mean by Witricity ?
2) Need of Witricity.
3) History of wireless power.
4) Techniques to Transfer
5) Application , Pros and cons.
6) Future and conclusion.

3. WHAT IS WITRICITY?
TRANSMISSION OF ENERGY THROUGH AIR IS
WITRICITY
CABLES ARE GOING TO BE REPLACED BY WITRICITY

4. Types of wireless energy
transfer techniques are:
• Short range-Inductive Coupling
• Mid range-Resonance -Inductive
Coupling
• Long range –Microwave Transmission

5. INDUCTIVE COUPLING
• Uses
Electromagnetic
Induction concept
• Primary and
secondary coils
are not
connected with
wires.
• Energy transfer is
due to Mutual
Induction
.Oscillating electric
field produces
magnetic field and
vice versa

6. RESONANT INDUCTIVE
COUPLING
• USES ALMOST THE SAME
CONCEPT OF INDUCTIVE
COUPLING JUST THAT THE
COILS OPERATE IN
RESONANT FREQUENCY
LEADING TO EFFICIENT
ENERGY TRANSFER OVER
A LARGE DISTANCE

7. WORKING
• PROPERTY OF SYSTEMS TO
OPERATE AT HIGHER
AMPLITUDES AT PARTICULAR
FREQUENCIES KNOWN AS
RESONANT FREQUENCIES THAN
AT OTHERS
• WHEN TWO OBJECTS OPERATE
AT SAME RESONANT
FREQUENCY THEY TRANSFER
ENERGY EFFICIENTLY BETWEEN
THEM WITHOUT INTERFERING
WITH THE OFF RESONANT
OBJECTS
•
• THE RESONANCE INDUCTION
WORKS EVEN WHEN THERE IS
OBSTRUCTION PLACED IN
BETWEEN THEM

8. Microwave Transmission
• Aims at higher power transfer over longer distances
practically in the range of some miles
Requires a microwave source, antenna and rectenna.
Steps:
1.conversion of electrical to microwave energy
2.Capturing of microwave beams by Rectenna
3.conversion of microwave to electrical energy

9. Applications of long range
transmission• SOLAR POWER
SATELLITES:
• WORKING
1) absorb light energy from
sun.
2) converted to electric
energy and beamed to
earth stations in form of
microwave beams
3) so it can power
satellites,aircrafts,even
supply electricity to places
where wired connections
are not possible at lower
prices.

10. APPLICATIONS
1)Rectenna in the US with
diameter of half a mile
receives 95% of microwave
power which is supplies
5000MW power as result
2) Charging electric car using
witricity
3)Charging laptops and
mobiles using POWERMAT

11. • Charging electric car
using witricity