Unlike the coils of a conventional transformer that are
wound around a magnetic core to attain tight coupling, the
coils of IPT are usually loosely coupled due to the absence of a
common magnetic core to confine and guide most of the
magnetic flux [3]. Fig. 1 shows an example of IPTs'
transfonner with large air-gap. Transmitting coil or primary is
the coil that is connected to the supply side and the receiving
coil or secondary is the coil that catches the energy transferred
by primary and is connected to the load side [4].