Analysis and design of wireless power transfer system with an intermediate coil for high efficiency

By SangCheol Moon, Bong-chul Kim, Shin-Young Cho, Gun-Woo Moon. IEEE ECCE Asia Downunder, 2013

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Inductive Wireless Power Transfer Charging for Electric Vehicles–A Review (2021, background): “Introducing intermediate coils enhance the power transfer between the source and load [81]–[85].”
A Methodology for Making a Three-Coil Wireless Power Transfer System More Energy Efficient Than a Two-Coil Counterpart for Extended Transfer Distance (2015, methodology): “The use of three-coil systems has been addressed in [19] and [24].”
Comparative Analysis of Two-Coil and Three-Coil Structures for Wireless Power Transfer (2017, background): “It has been reported that the cross-coupling effects of nonadjacent resonators would cause the maximum efficiency operation to shift away slightly from the resonance frequency in domino-resonator systems [24], and the source coil could induce a bifurcation phenomenon in the three-coil system [30]; t”
Wireless Power Transfer—An Overview (2019, methodology): “In addition, an intermediate coil was utilized for the WPT system [26], which can boost the apparent self-inductance and magnetizing inductance for the primary unit at around the Fig.”
An Inductive and Capacitive Combined Wireless Power Transfer System With LC-Compensated Topology (2016, background): “The two coils form a separated transformer, in which the primary side is loosely coupled with the secondary side [6].”