“…As a result, the current is induced by induction therein, and a rectifier is then used to convert the AC-induced current to DC to charge the battery [23]. Figure 2 shows the equivalent circuit model using lumped parameter model when using a series-series (SS) compensation topology [24]. In the figure, I 1 , R 1 , C 1 , and L 1 are the primary side current, resistance, capacitance, and inductance, respectively, and I 2 , R 2 , C 2 , and L 2 are the corresponding parameters on the secondary side, M is the mutual inductance between the primary and secondary coils, and V in , R s , and R L are the HF power source, the power source internal resistance, and the load resistance, respectively.…”