Design of a single-stage converter for wireless charging systems in automated guided vehicles

Abstract

Currently, wireless charging systems are widely used in various fields. In wireless charging systems for automated guided vehicles, traditional multi-stage structures fail to achieve high efficiency and require significant investment costs. Moreover, these multi-stage structures demand separate and complex control. This paper proposes a single-stage converter based on a totem-pole structure and a phase-shift control method to regulate constant current charging in wireless charging systems for automated guided vehicles. The proposed converter has a simple structure.
It eliminates the need for a large-capacitance Clink, achieves soft switching for the semiconductor switches, ensures a high input power factor, and maintains a low total harmonic distortion. Additionally, a dual-side LCC compensation circuit is designed to maximize transfer efficiency. The results show that the overall system efficiency from the grid input to the load exceeds 93, 92%, with a high input power factor ranging from 0,960 to 0,989, and a low input THD of less than 1, 84% across the entire operating range.