2. wireless power transmission or electromagnetic
power transfer is the transmission
of electrical energy without wires.
Wireless power transmission
technologies use time-varying electric, magnetic,
or electromagnetic fields.
3. History of WPT-
Sir Nicola Tesla was the first one to propose the research idea on wireless
power transmission on 1899. later many scientists and scholars did work on
WPT to make their dream true….
1899 sir Tesla wrote about his experiment on WPT “the inferiority of the
induction method would appear immense as compared with the distributed
charge of ground and air method.
In 1961 William C. Brown published an article exploring the possibilities of
microwave power transmission.
In 2009 SONY launched a wireless electro-dynamic induction powered TV set
60W over 50 C.M.
4. Types of WPS…
There are a number of different technologies for transmitting energy
by means of electromagnetic fields
1. Near field techniques
1.1 Inductive coupling
1.2 Resonant inductive coupling
1.3 Capacitive coupling
1.4 Resonant capacitive coupling
1.5 Magneto dynamic coupling
2. Far field techniques
2.2 microwaves
2.2 lasers
5. Near field (non radioactive) techniques
There is a brief description given below…
Technology Range Directivity Frequency Antenna devices applications
Inductive coupling Short Low Hz – MHz Wire coils
Electric tooth brush and razor battery
charging, induction stovetops and
industrial heaters.
Resonant inductive
coupling
Mid- Low kHz – GHz
Tuned wire coils,
lumped element
resonators
Charging portable devices (Qi),
biomedical implants, electric vehicles,
powering busses, trains,
MAGLEV, RFID, smartcards.
Capacitive coupling Short Low kHz – MHz Metal plate electrodes
Charging portable devices, power routing
in large-scale integrated circuits,
Smartcards.
Magnetodynamic
coupling[11] Short N.A. Hz Rotating magnets
Charging electric vehicles, busses,
biomedical implants.
6. Far-field (radioactive) techniques…
Technology
Range Directivity Frequency Antenna devices applications
Microwaves Long High GHz
Parabolic
dishes, phase
arrays, recentness
Solar power
satellite, powering
drone aircraft.
Light waves Long High ≥THz
Lasers, photocells,
lenses
Powering drone
aircraft, powering
space elevator
climbers.
7. Application of WPS…
Electronic portable devices…
Electric Vehicles
Theoretical applications: Aerial Vehicles and
Solar Power Satellites
