Simultaneous estimation of primary voltage and mutual inductance based on secondary-side information in wireless power transfer systems

A dynamic wireless power transfer (WPT) system for electric vehicles (EVs) has gathered attention and been expected to extend the limited driving range of EVs. Previous research has proposed secondary-side-only power and efficiency control to simplify the road-side facilities, which are installed over long distances. Although the primary voltage and the mutual inductance between the transmitter and receiver have to be given or estimated in the control, multi-parameter estimation from the secondary side without signal communication remains unrealized. This paper proposes a simultaneous estimation method of the primary voltage and the mutual inductance using only secondary-side information. The simulations and the experiments show that the proposed method is effective for secondary-side control.