Feedback Control-Free Dynamic Wireless Power Transfer System for AGVs

Abstract

Dynamic wireless power transfer (DWPT) chargers are crucial technological components for the future development of infrastructure suitable for electric vehicle (EV)-based transportation and mobility systems in industrial automation. This paper proposes a novel DWPT system for autonomous guided vehicles (AGVs) using single-ended inverters and a multi-transmitter and receiver coil system. The proposed DWPT system, featuring a multi-coil arrangement, exhibits an extremely small, lightweight, and low-cost structure without batteries. It operates stably despite the position deviation of transmitter (Tx) and receiver (Rx) coils without any feedback control, due to a single-ended high-frequency inverter with parallel-series resonant compensation tanks. The performance of the proposed DWPT system was experimentally investigated with a 1.5kW-85kHz prototype, verifying the robustness against dynamic deviations of Tx and Rx coil distances. Additionally, the low peak power profile enabled by the multi-coil system achieves high efficiency and high energy utilization from a practical perspective.