Wireless Power Transfer

The basic aim of this project is to transmit electric power wirelessly.

Wireless Power Transfer (WPT) or wireless energy transmission is the transmission of electrical power from a power source to a consuming device without using solid wires or conductors. Wireless transmission is useful to power electrical devices in cases where interconnecting wires are inconvenient, hazardous, or are not possible.

The basic aim of this project is to transmit electric power wirelessly.

Wireless power techniques fall into two categories, non-radiative and radiative.

In near-field or non-radiative techniques, power is transferred over short distances by magnetic fields using inductive coupling between coils of wire.

In radiative or far-field techniques, also called power beaming, power is transmitted by beams of electromagnetic radiation, like microwaves or laser beams.

Fig. 1: Prototype of Wireless Power Transfer Model

Working:

The Circuit consist of two main parts, the first ne is Transmitter and second one is Receiver.

Transmitter:

Transmitter has 2 main parts: oscillator circuit and inductive coil.

Oscillator circuit is a modified Hartley Oscillator.

The Hartley oscillator is an electronic oscillator circuit in which the oscillation frequency is determined by a tuned circuit consisting of capacitors and inductors, that is, an LC oscillator.

The circuit consists of a single capacitor in parallel with a single tapped inductor coil, and the feedback signal needed for oscillation is taken from the center connection of the tapped inductor.

Inductor coil is made of a copper wire (28 AWG) having the number of turns 5 in each coil with diameter of 5 cm. There are 2 coils which are connected in series.