A Stable Dynamic Electric Vehicle Wireless Charging System Based on Triple Decoupling Receiving Coils and a Novel Triple-Diode Rectifier

In electric vehicle (EV) dynamic wireless power transfer (DWPT) systems, changes in the mutual inductance will lead to fluctuations in the output voltage and efficiency. In this article, a triple-coil receiver with a novel triple-diode rectifier structure that can reduce the number of diodes is proposed, with each phase connected to one of the triple decoupling coils (TDCs) on the receiving side. Decoupling is achieved with partial overlapping. Reverse windings are integrated into TDC to smooth the mutual inductance fluctuations. The proposed novel rectifier switches between the single-coil receiving mode and the dual-coil receiving mode in response to the different positions of the EV. The proposed magnetic coupler structure and the novel triple-diode rectifier guarantee a constant output during movement. The effectiveness of the proposed DWPT system has been verified by the experimental prototype. The output voltage remains stable over a long range, with a fluctuation of only about 3.49%. The proposed DWPT system cannot only reduce the number of track coils but also extend the novel triple-diode rectifier to multiple coils with a reduced diode number, which has a good reference value.