Week 8 : Another comparison of wireless power transfer

Objectives:

1. To get the idea by making comparison of others project
2. To determine whether the size of the transmitter coil would affect the range of wireless power transfer

Methods:

1. By making some research on internet
2. By comparing others project on wireless power transfer
3. Attachment below shows on the project

Results: 
 

Figure 1: Wireless power transfer powered up a small bulb

Figure 2: Circuit diagram for the wireless power transfer transmitter 

Figure 3: Video showing on the commissioning of the wireless power transfer 

Conclusion:

As for conclusion, I found that with increase the size or diameter of the coil, the range of the wireless power transfer also increase. Also, with the increment of the coil loop, will make the range increase. This is because, by increasing these two factors, the resonant frequency for receiver and transmitter also will be decrease, but to achieve this, both of the circuit should resonate at the same frequency which means that the loop should on the same size. Larger loop with the same capacitance value will  lower the resonant frequency. The best way to increase the range is by lowering the resonant frequency. There are also another way to increase the range of the wireless power transfer such as by inserting ferrite core into a loop which will decrease the resonant frequency. The research on this factor to increase the range of the wireless power transfer still in progress.