Large airgap capacitive WPT systems are reaching higher power levels, bringing EV charging closer to reality. However, the high-power systems demonstrated so far remain bulky and unsuitable for stationary or dynamic EV applications. This digest presents a compact, lightweight capacitive WPT system in which downsized power electronics are co-packaged with the charging pad, enabling integration with both EV underbodies and roads. Compactness is achieved by optimizing the matching network and power-combining components. Inductors and transformers are realized using toroidal geometries with interleaved windings that reduce size while preserving high quality factor. This miniaturization also lowers electromagnetic interference without compromising efficiency. A lightweight pad with optimized dielectric profile further reduces system thickness, weight, and cost. A 12-kW, 6.78-MHz, 12-cm airgap system targeting >150 kW/m² power density and 90% efficiency has been developed. An experimental prototype confirms good agreement with theory.
