Maximum Efficiency Point Tracking Method for Multi-Coil Wireless Power Transfer Systems

The paper presents a maximum efficiency point tracking (MEPT) method for multi-coil wireless power transfer (MC-WPT) systems. The MC-WPT system matrix model based on relative parameters is developed. Using the model, the impact of load resistance changes on the MC-WPT system efficiency is carried out. The basic properties of selected DC/DC converters are discussed and compared. Next, using the single ended primary inductance converter (SEPIC), the MEPT method for MC-WPT systems is proposed. The MEPT method has been positively verified experimentally.