A Thyristor-based Seamless Winding Changeover Circuit for high efficiency of Electric Vehicle Drive System

This paper propose a novel winding changeover circuit that can maximize the average efficiency in the wide speed range to extend the driving distance of the Electric Vehicle and improve the fuel efficiency. Proposed circuit is Series-Parallel changeover circuit based thyristor. Due to the characteristics of the thyristor, it is possible to achieve a seamless transient state without interruption. So no additional snubber circuit is required and high efficiency and light weight of AC motor system can be expected because of low switch loss. The proposed winding changeover circuit is validated through simulation and experimental results with 80kW AC motor.