Output Voltage Range of SN-Compensated Inductive WPT Link Operating in Load Independent Regime

The paper presents performs output characteristics analysis of a practical series-none (SN) compensated inductive wireless power transfer link (IWPTL), operating at load independent frequency. It is shown that the output DC voltage of the IWTPL is load dependent, residing in a certain range rather than being constant. Phasor-domain equivalent circuit is employed to predict the output DC voltage under full loading, time-domain analysis is used to derive the output DC voltage under conditions of zero-loading. The two values obtained represent lower and upper bound, respectively, of the output DC voltage. The proposed methodology is verified by simulations and experiments of a 380V, 1.2kW SN-compensated IWPTL.