Sizing of Inductive Power Pads for Dynamic Charging of EVs on IPT Highways

In this paper, the physical sizing of inductive power transfer (IPT) power pads on a dynamic IPT highway is explored. Previous work has focused only on sizing for stationary IPT chargers, and this paper extends this analysis for double-D (DD) and DD quadrature-based power pads. First, a window function (here fitted using a Gaussian distribution) is created to model the power transfer profiles when individual primary pads on the highway are energized. An analytical expression is developed that can predict the resultant power profiles from energizing multiple primary pads, depending on the phase angle between the individual primary pad currents and the physical sizes of the IPT pads. A practical design example is then presented that shows how pads could be sized to allow for 10-kW power transfer to sedans and SUVs (air gaps ranging from 250-400 mm) with only a 25% reduction in power as they drive along the highway.