A Reconfigurable Resonant Topology of Wireless Power Transfer Systems with Large Coupling Ranges

摘要

The power transfer capability of a wireless power transfer (WPT) system is largely limited by its coupling range. The transferred power of a series-series (SS) compensated WPT system will usually decrease when the winding coupling increases. Therefore, it is difficult to design a WPT system which can output the desired amount of power in a large coupling range under practical constraints such as voltage and current limits. This paper proposes a reconfigurable resonant topology based on a split transmitting winding, which can select different connection schemes and operation modes for different winding position ranges. The proposed reconfigurable resonant topology reuses various parts of the resonator in different modes, so that the system has five operation modes to cover a wide winding position range meeting the given load and VA requirements while only using two windings (both in the primary side). Simulation and experimental results are given to verify the proposed reconfigurable resonant topology.