Design and Analysis of Multiload Inductive Power Transfer System Using Bilateral-Excitation Scheme

The repeaters in cascade structure can be used to suppress the cross coupling between the nonadjacent repeaters in multiload inductive power transfer (ML-IPT) system. In this article, the cascade repeaters used in the ML-IPT system work both as power transmitters and load carriers. Based on the cascade scheme, the system models of two ML-IPT systems with single-excitation (SE) scheme for different load position are established and high-order compensations are designed to achieve constant load currents. Referring to the topologies of the two ML-IPT systems with SE scheme, a bilateral-excitation (BE) scheme is further proposed to improve output currents and system reliability, and the comparison of the conventional scheme and the proposed scheme is also presented. Finally, a prototype of ML-IPT system with the proposed BE scheme is built, where the maximum deviation of the output currents is less than 13% and the maximum power transfer efficiency reaches 89.2% for an eight-load case.