Optimizing wireless charging for electric vehicles via a novel coil design and artificial intelligence techniques

Abstract

Rapid charging technologies are not only about user convenience but also play a pivotal role in diminishing our dependency on fossil fuels. This study explores the advancements in fast wireless charging, addressing a significant challenge: the extensive charging time and the air gap between the coils. In response, we have developed a resonant wireless charging system based on the Society of Automotive Engineers (SAE) Level 3 direct current fast charging criteria. Utilizing a constant current–constant voltage (CC–CV) control strategy with an adaptive neuro-fuzzy interference system ensures a steady current throughout the charging phase. A novel coaxial nested coil is proposed to optimize power transfer with a smaller air gap of 1 mm. This achieved 800 V direct current with minimal harmonics, which is around 3.47%. It reduces spikes that accompany charging current by approximately 50% to ensure a more stable, efficient, and reliable charging system reaching full charge after 26 s. The system’s efficacy and performance were substantiated by MATLAB Simulink 2022b simulations, and an implemented prototype model is presented.

Keywords

• electric vehicles
• wireless charging
• constant current–constant voltage
• adaptive neuro-fuzzy interference system
• fast charging