Hybrid-Network based Dynamic Wireless Power Transfer With Reduced Power Pulsation

Abstract

Dynamic wireless power transfer (DWPT) is a promising solution for extending electric vehicle range, reducing the need for large onboard batteries, and promoting sustainability. However, existing DWPT systems encounter several challenges including the large number of compensation components, power loss, pad misalignment, and receiver power fluctuations. This paper proposes a hybrid-network based DWPT system consisting of LCC-S and S-LCC networks, along with a bipolar coupling pad design, to address these challenges. The hybrid networks are connected in parallel to a common inverter and the bipolar pads are loosely placed on the track to reduce costs. A mathematical model was developed to model the system, then a misalignment tolerance tuning method was used to tune the resonant network. A 75W system was developed, and a laboratory prototype was built to validate the proposed hybrid-network based DWPT system. The system achieved approximately 70.6% efficiency, with output fluctuations less than ±10%, ±15% tolerance to lateral misalignment, and no null power when charging. The proposed system demonstrated similar performance at different receiver speeds and misalignment.