Analytical Power Fluctuation Suppression With Reconfigurable Tx Coils for Dynamic Inductive Power Transfer Systems

This paper presents a reconfigurable coil design framework for dynamic inductive power transfer (DIPT) systems to ensure stable and robust output characteristics while minimizing construction costs. In this paper, two innovative transmitter (Tx) coil configurations are introduced: the inner and outer square (IOS) and the two half-square toroidal (THST), each designed to support flexible reconfiguration for diverse operational needs. The framework achieves this flexibility by integrating a switch-array reconfiguration mechanism with an algorithmic coil optimization methodology. The switch array facilitates varied Tx coil unit connections. Notably, anti-series connections outperform conventional single Tx coil units in suppressing output fluctuations, while forward-series connections enhance versatility, offering IOS units a wider output range and THST units improved interoperability with unipolar and bipolar receiver (Rx) coils. A numerical algorithm evaluates the dynamic mutual inductance characteristic, quantifying the impact of linear and angular misalignments on fluctuation patterns and extrema shifts. This framework not only generates a family of compensation coils by presetting fluctuation tolerance and power transfer capacity indicators for a smaller Tx coverage density but also streamlines development, outpacing traditional finite element analysis and trial-and-error methods. Both simulation and experimental results validate the framework's efficacy, demonstrating a scalable, cost-effective solution for dynamic charging applications.