Analysis and control design for input-series output-parallel multi-channel inductive power transfer system

Abstract

To realize high-power inductive power transfer (IPT) for fast charging of electric vehicles (EVs), an input-series output-parallel (ISOP) multi-channel IPT system is analysed in this paper, and an output control strategy based on single neuron controller is proposed to improve the stability of the system. Firstly, the steady-state operating conditions of ISOP-IPT system is analysed based on different compensation networks which shows that the constant-voltage-output compensation networks are more suitable for the proposed circuit structure. Then, to improve the voltage equalization between channels, an open-loop control method combining parameter design and phase-shift control is proposed against different coil misalignments. At the same time, based on the single neuron controller, the system output closed-loop control is realized without the need of accurate system modelling. Finally, a three-channel ISOP-IPT experimental system was constructed, which operated stably at 2.9 kW with a power efficiency of 93.38%. The system closed-loop control with control time of 22 ms is realized. The voltage equalization control offset is less than 1%.