28-02-2013, 10:47 AM
WIRELESS POWER TRANSMISSION(wpt)
WIRELESS POWER.pptx (Size: 1.08 MB / Downloads: 64)
What is WPT ?
The wireless power transmission is transmission of electrical energy from a power source to a electrical load without interconnecting manmade conductors or wires.
This is useful where interconnecting wires are inconvenient, hazardous or impossible.
Why not wires?
As per studies, most electrical energy transfer is through wires.
Most of the energy loss is during transmission.
On an average, more than 30%.
In India, it exceeds 40%.
History of WPT
Discussion of wireless power transmission as an alternative to transmission line power distribution started in the late 19th century.
Both Heinrich Hertz and Nicola Tesla theorized the possibility of wireless power transmission .
Inductive coupling
Primary and secondary coils are not connected with wires.
Energy transfer is due to Mutual Induction.
Transformer is also an example.
How Resonance in RIC ?
Coil provides the inductance.
Capacitor is connected parallel to the coil.
Energy will be shifting back and forth between magnetic field surrounding the coil and electric field around the capacitor.
Radiation loss will be negligible.