Week 7 : My own design of the wireless mobile charger

Objectives:

1. To proposed my own design for the wireless mobile charger
2. To design the wireless charger (transmitter) using designer software

Methods:

1. By comparing other wireless mobile charger that available in market
2. Designing the transmitter platform using SketchUp software
3. Attachment below are some of my design on the wireless mobile charger

Results: 
 

Figure 1: Front Side View

Figure 2 : Back Side View

Figure 3: Bottom View

Figure 4 : On/Off Button



Conclusion:

As for this week, my progress on the development of the wireless mobile charger is more on the design that I want to propose to my supervisor. The design is quite compatible for any type of mobile phone. Even, the deck or platform for the mobile charger can charge more than one mobile phone at one time. The mobile phone must be place on the platform along with a receiver which I will develop after this. I propose that the platform should be made of plastic and also a little bit of rubber to prevent the mobile phone from slipped off from the platform. The platform will use power source from USB plug cable that can be plugged at socket outlet or any USB source such as PC or laptop. Also, it has a ON/OFF button at the back side of the platform. This is only the platform design of the wireless mobile charger, it is not including its circuit design yet.

Week 6 : Comparison with other wireless charger

Objectives:

1. To compared the previous design of wireless charger with other design
2. To compared the range of the power that being transferred by these two devices

Methods:

1. By making research on internet
2. Comparing the previous design with a product that has been marketed

Results:

Figure 1: transmitter circuit  or platform which contain coils inside it

Figure 2: the receiver

Figure 3: As we can see, the receiver also contain with coils.

Conclusion:

As for conclusion, I found that the design that being used is much more attractable and much more effective than the previous design that looked quite clutter or unmanaged. This design also shows that the range that the wireless power can be transmitted is quite better than the previous design. This technology also known as Qi (pronounce as chi).  This technology also using the same working principle as previous project, which is using inductive coupling method. The coupling method is the principle on how the transformer work when there is an air gap between the transformers. The primary coil and the secondary coil are not directly connected each other. Each coil has their own circuit. Energy transfer took place through a process known as mutual induction.

Week 5 : The design

Objectives:

1. To design the wireless charger by compared with design that has been create by others
2. To study the method that being used in built up the wireless charger

Methods:

1. By making research on internet
2. Comparing other person that has create the wireless charger
3. Attachment below shows the design and the block diagram of the project

Results:

Figure 1: design for the wireless charger

Figure 2: block diagram for the wireless charger

Conclusion:

On my observation through this person project, my find out is that the wireless charger is consists of two portable platform that can be easily moved each other but there are some distance that these two platform must be keep so that the power can be transferred wirelessly. Otherwise, the power cannot be transferred. The distance that this two portable platform must be keep is around 3 cm. The working principle of this project is in this wireless charging system there are two circuits, a transmitter circuit and a receiver circuit (as being mention as two portable platform).

• The transmitter circuit consists of step down transformer of 230/12V. This transformer steps down 230V AC from main supply to 12V AC. Then that 12V AC is converted into 12V DC with the help of bridge rectifier. After that a 2200/25V capacitor is used to filter the ripples and pure DC is supplied. Then the oscillator circuit oscillates at 10MHz and with the help of transmitting coil it transmits the wireless power.
• The receiver circuit receives the power through receiving coil and passes through voltage multiplier circuit (consisting of diode and capacitor voltage multiplier) and through that voltage the mobile charging is achieved.

Week 4 : Introduction of my FYP

Objectives:

1. To give an overview on my final year project
2. To make an introduction to my FYP

Methods:

1. By making research on internet
2. By comparing to other device that using this wireless power transfer technique
3. Here are the attachments about my introduction on my FYP

Results:

Video : Showing how wireless power transfer works

Conclusion:

This week I am going to give an overview on my final year project. My final year project title is the development of wireless charger for mobile phone. As the term ‘wireless’ has been mention it is mean that the mobile phone is going to be charge without using any wire or solid conductor. As being mention in my last blog, this wireless charger has 3 different methods of transferring the energy, but for my project I am going to use the inductive coupling method. This is because inductive method is a simple power transmission that uses a technique as same as transformers. It consists of two coils that being separated by air and air is being used as a medium for transmit the power. Every substance can be used to transfer power because of its permeability. Air also has its own permeability. Permeability is a quantity measuring the influence of a substance on the magnetic flux in the region it occupies. Therefore, air also can be a medium for electromagnetic field to exist. The existence of magnetic field will make the power from primary coil to be transferred to secondary coil.