WIRELESS POWER
TRANSMISSION

OBJECTIVES:-
 What is Wireless power
Transmission?
 History of WPT.
 Types of WPT.
 Advantages.
 Disadvantages.

WHAT IS WPT ?
 Wireless power or wireless energy
transmission is the transmission of electrical
energy from a Power source to an electrical load
without man-made conductors.
(OR)
 Simply the transmission of energy from one place
to another without using wires.

HISTORY
 In late 1980s Nikola Tesla worked on Induction
techniques.
 He was able to transfer energy from one coil to
another coil.
 He managed to light 200 lamps from a distance of
40 km.
 The idea of Tesla was taken into research after
100 years by the project named “ WITRICITY”.

TYPES OF WPT
 WPT can be used in 2 ways.
 For nearer purpose:
o Inductive coupling .
o Resonant Inductive coupling.
o Air ionization.
 For farther purpose:
o Microwave power transmission.
o Laser power transmission.

INDUCTIVE COUPLING
 Primary and secondary coils are not connected
with wires.
 Energy is transferred due to mutual induction.
 Examples are wireless charging pad, transformer
etc.

AIR IONIZATION
 Air ionizes at high field.
 Needed field is 2.11MV/m.
 Natural example is lightening.
 Not feasible for practical implementation.

Microwave Power Transmission
 Transfers high power from one place to another.
 Steps:
o Electrical energy to microwave energy.
o Capturing microwaves using antenna.
o Microwave to electrical energy.

ADVANTAGES
 Elimination of high power transmission
lines.
 Reduction in cost because of not using
expensive wires.
 It increases the portability of electrical
devices as it removes wires.
 Reduction in power losses.

DISADVANTAGES
 Interference with existing
communication systems.
 To much expensive for bigger scale
implementation.
 Microwaves hazardous to human life.