FYP sem 2 : week 2

a meeting was held by my supervisor.
the purpose of the meeting is to show the progress of the project.
i  explained to my supervisor about the problems.
luckily my supervisor understand and very helpful.
nevertheless i need to counter problem myself because this is my own project.

my team member and i went to Jalan Pasar in searching for the rarest components.
the shop will contact us A.S.A.P. once they order the component.
can't wait for the shop reply. i'm eager to start the project as soon the component arrives.
if there is no other alternative i need to order the component myself via online.

for the time being i need to make calculation for the project.
need to refer to some electronic lecturer and ask them for their help.

FYP sem 2 : week 1

semester open and registration.

i've done some research and searching to understand more about my project.
done some research and i understand more about my project.

made new circuit for the project after i made some research for the project.

the circuit is much more simplified from the previous circuit.
still using the rarest capacitors with rating of 1000V.
for sure its hard to find in the local stores.
with some addition diode added to the circuit. i hope that with diode added my project will works fine in the future. some missing link from the previous circuit has been corrected for easy to viewer.
this time the circuit have 2 parts the picture above (transmitter and receiver).
I'm not yet include the circuit for phone wireless charging part (receiver).
i need to do more research and understanding for that circuit

MAIN PROBLEM
the project does have several problems which is the component to build the project is hard to find in the local electronic shop in Malaysia.

so i need to find other alternatives how to reduce or overcome the problems.
i've already went to a shop at Shah Alam to to search for the component.
i met with the shop owner and ask if he can order the component for my project.
he will call me soon ( no reply from him ). as expected.

so for this FYP i team up with 1 of my friend Nasruddin Sidek. what i heard about this project it is an easy one but yet a difficult project. it is hard to achieved the output for the load.

i already bought the components for this project according to the rough design from my research from the internet. the components were connected on a bread board. after completing the connection i tested the circuit by using 12V car battery. as a result the circuit blown of with some smoke appeared from the board itself. maybe the breadboard that i used can't bare with the voltage from the battery or maybe the circuit were wrong.

after several weeks i did some research, and i found out that there were some parts missing in the circuit and there is another way to connect the components.

i will continue this project for the next semester.

my proposal and presentation already done for this semester.

Rough Overview of The Project

after choosing a title for the FYP, i did some research using the internet and some reference book and notes from my previous subject ( Elctrical Machine and Drives ). i gone through some theory and calculation for the project.

there are 2 important reading that i suppose to calculate:

1. Inductance
2. Frequency

Inductance

There are four basic factors of inductor construction determining the amount of inductance created. These factors all dictate inductance by affecting how much magnetic field flux will develop for a given amount of magnetic field force (current through the inductor's wire coil):

NUMBER OF WIRE WRAPS, OR "TURNS" IN THE COIL: All other factors being equal, a greater number of turns of wire in the coil results in greater inductance; fewer turns of wire in the coil results in less inductance.

Explanation: More turns of wire means that the coil will generate a greater amount of magnetic field force (measured in amp-turns!), for a given amount of coil current. 

COIL AREA: All other factors being equal, greater coil area (as measured looking lengthwise through the coil, at the cross-section of the core) results in greater inductance; less coil area results in less inductance.

Explanation: Greater coil area presents less opposition to the formation of magnetic field flux, for a given amount of field force (amp-turns). 

COIL LENGTH: All other factors being equal, the longer the coil's length, the less inductance; the shorter the coil's length, the greater the inductance.

Explanation: A longer path for the magnetic field flux to take results in more opposition to the formation of that flux for any given amount of field force (amp-turns). 

CORE MATERIAL: All other factors being equal, the greater the magnetic permeability of the core which the coil is wrapped around, the greater the inductance; the less the permeability of the core, the less the inductance.

Explanation: A core material with greater magnetic permeability results in greater magnetic field flux for any given amount of field force (amp-turns). 

An approximation of inductance for any coil of wire can be found with this formula:

Frequency

the formula for resonant frequency is

f = 1/2π sq.rt of LC

for this project we will try to make a miniature of the real project to see if there's any possibilities it can succeed.below are the rough design that we will do

i will try to change a bit the design to make it able to charge mobile phone

INTRODUCTION

 
Wireless energy transfer or wireless power is the transmission of electrical energy from a power source to an electrical load without a conductive physical connection. Wireless transmission is useful in cases where interconnecting wires are inconvenient, hazardous, or impossible. The problem of wireless power transmission differs from that of wireless telecommunications, such as radio. In the latter, the proportion of energy received becomes critical only if it is too low for the signal to be distinguished from the background noise. With wireless power, efficiency is the more significant parameter.  A large part of the energy sent out by the generating plant must arrive at the receiver or receivers to make the system economical. The most common form of wireless power transmission is carried out using direct induction followed by resonant magnetic induction. Other methods under consideration include electromagnetic radiation in the form of microwaves or lasers.

Inductive coupling

In electrical engineering, two conductors are referred to as mutual-inductively coupled or magnetically coupled when they are configured such that change in current flow through one wire induces a voltage across the ends of the other wire through electromagnetic induction. The amount of inductive coupling between two conductors is measured by their mutual inductance. The coupling between two wires can be increased by winding them into coils and placing them close together on a common axis, so the magnetic field of one coil passes through the other coil. The two coils may be physically contained in a single unit, as in the primary and secondary sides of a transformer, or may be separated. Coupling may be intentional or unintentional. Unintentional coupling is called cross-talk, and is a form of electromagnetic interference. Inductive coupling favors low frequency energy sources. High frequency energy sources generally use capacitive coupling. An inductively coupled transponder comprises an electronic data carrying device, usually a single microchip, and a large coil that functions as an antenna. Inductively coupled transponders are almost always operated passively.

Devices that use inductive coupling include:

• Transformers
• Electric motors and generators
• Induction loop communication systems
• Metal detectors
• Graphics tablet
• Radio Frequency Identification
• Electronic article surveillance tags to prevent theft (most types).
• Inductive Modems
• Resonant energy transfer
• Inductive charging products charge batteries using inductive coupling, such as eCoupled; Torches, Cochlear Implants and many electric toothbrushes.
• Induction cookers and induction heating systems

 As for final year project my group already pick this kind of theoretical method for our next semester project. there is several kind of methods for the wireless power transmission can be done. But i choose the Inductive Coupling Method for the project. We use this method to charge mobile phone via wireless.

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