This
thesis is dealing with the wireless power transfer which topic is gaining
maximum popularity nowadays. It is based on resonant inductive coupling with
the use of magnetic material and some metal plates. In the recent years, many
applications are introduced with the help of this technology due to the energy
crisis. It can be used to transfer power or charge motionless, moving objects
and also for an automobile. After the optimization and testing this technology
with different techniques, now it can take place the old energy transfer
method. Wireless power transfer has an advantage in which there is no need for
any metal object, wood etc. or granite that must exist between the coils. we
can transfer power anywhere through the air medium, while the long-established
method have also some problems in case of a bad environment or the loss of any
medium can break the whole connections. Further, the maximum power can be
transfer and the current rate will be stable and reliable with their electrical
& electronic components. 

We design
the experimental device platform, verify the theoretical analysis. The effect
of resonant coils on different structures to transfer the energy through the
resonant system and the best inductance that enables the inverter
soft-switching to work normally and maintain high energy transfer efficiency is
verified by experiments. Ultimately, we achieved through experiments with 10cm
distance, the transmission efficiency was more than 90%.  

In
the design, the output side of the high-frequency excitation source, in order
to make the power switch for the inverter circuit in the soft-switching state. Due
to the less efficiency, it is necessary to make the output side stronger,
adding an inductance coil on the output side, to stabilize the output voltage. However,
increasing the inductance coil in the system will affect the resonance
frequency and the transmission efficiency of the resonance system to a certain amount.
So a suitable inductance needs to be selected for the matching design.