Week 11 (FYP Semester 1)

As shown in this video below,it depicted that the value of capacitor in Receiver Circuit influence the distance and brightness of LED. The value of capacitor directly proportional with the distance of Receiver and Transmitter circuit. The higher value of capacitor in Receiver circuit, the higher the distance it can go further.

Week 9 (FYP Semester 1)

The voltage regulator is a regulator used to maintain voltage levels. The regulator is designed to maintain a constant voltage level. A voltage regulator is a simple “feed-forward design. It uses an electromechanical mechanism. Depending on the design, it used to regulate one or more AC or DC voltages.

Let say use LM7806 is used to regulate voltage in the system and output of 6V dc (maximum output current: 1000mA). It supports input voltage from 5.75V dc to 6.25V dc. If the input voltage is over, the voltage regulator may be burn or auto shutdown due to overheat. A diode is connected at the input LM7806. This is to avoid voltage reversely. An on/off switch is used to turn on/off the system and LED is used to indicate the system power on/off. The LED is connected through 1000Ω resistor to limit current pass through LED.

Voltage regulator circuit for LM7805

Week 8 (FYP Semester 1)

From the circuit diagram, transistor BD139 is used as part of the transmitting circuit. A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit. A voltage or current applied to one pair of the transistor's terminals changes the current through another pair of terminals. Because the controlled (output) power can be higher than the controlling (input) power, a transistor can amplify a signal. Today, some transistors are packaged individually, but many more are found embedded in integrated circuits.

The common-emitter amplifier is designed so that a small change in voltage (Vin) changes the small current through the base of the transistor; the transistor's current amplification combined with the properties of the circuit mean that small swings in Vin produce large changes in Vout. Various configurations of single transistor amplifier are possible, with some providing current gain, some voltage gain, and some both.

Amplifier circuit

Week 6 (FYP Semester 1)

I have searched about this Wireless Power Transfer. Firstly, I'm looking for the circuit diagram that involved with WPT. This is what I found in internet.

I have list down all the equipments that using in WPT circuit:

a) Diode IN4007

b) Resonant capacitor 15nF, 1nF, 200pF

c) Transistor BD139

d) Foil capacitor 1nF, 4.7nF, 470pF,100nF, 220nF

e) Resistor 5.6k,15k

f) PCB

g) Baterry 

h) Wire 18 AWG

Week 5 (FYP Semester 1)

These are some videos taken from YouTube. It shows practically the operation of WPT works.

Week 4 (FYP Semester 1)

This is a little preview of my Final Year Project:

Wireless power transfer (WPT) or wireless electricity generate from a power source to an electrical load without man-made conductors. Wireless electricity is useful in cases where interconnecting wires are inconvenient, hazardous or impossible.

WPT is a concept of transferring the power of electromagnetism from the primary coil into the secondary coil without using any wires. There are several ways to produce WPT which is near field technique and far-field technique.

Near field technique is the technique that used to produces WPT in a short distance. There are three ways to produce WPT using near field technique that is:

i)             Inductive coupling

ii)            Resonant inductive coupling.

iii)           Air ionization

Far field technique is the technique that use to produce WPT in a long distance. There are two ways to produce WPT using far field technique which is:

i)             Microwave power transmission

ii)             Laser power transmission

Block Diagram of WPT operations:

            The plan for this project is to create a system that able to transmit power wirelessly.Using inductive coupling, it can be achieved by connecting power supply to the system that uses magnetic field to transfer energy through air. The coupling system involves a transmitting coil sending energy to a receiving coil. This is done by sending an energy signal through transmitting coil, and creating a magnetic field. The receiving coil then creates energy using the magnetic field.

Week 3 (FYP Semester 1)

Searching for the best supervisor for my project