Advanced Self-Oscillating Control for Domino Wireless Power Transfer Systems with Quasi-Load-Independent Outputs

Conventional self-oscillating control is designed for two-stage wireless power transfer (WPT) systems with load-independent (LI) outputs. In this paper, an advanced self-oscillating control is proposed for domino WPT systems by considering the effects of equivalent series resistances (ESRs) of the resonators on output performance. Due to the existence of ESRs, quasi load independent (QLI) output voltage is achieved by the proposed control. The optimal operating frequency, which results in the minimum output voltage deviations from the references, can be automatically selected by the proposed control. A four-coil series-series (SS)-compensated domino WPT system is set up to validate the effectiveness of the proposed control in practice.