Paper Title
Capacitive Coupling Wireless Power Transfer Scheme for Drones and Running Electric Vehicles

Abstract
To promote green energy, electric vehicles (EVs) are on the global market to replace vehicles with an internal combustion engine. But the EVs have a weak point that it is difficult to travel a long distance without parking for charging due to the limitation of battery capacity. At the same time, unmanned aerial vehicles (UAVs) with a battery are also increasing. However, the UAV with the battery has a similar weak point that it is difficult to fly a long time without landing for charging. To resolve this problem, the wireless power transfer (WPT) system is expected to feed running EVs and to charge parking UAVs with battery. This paper introduces a capacitive coupling WPT scheme for the feeding and the charging. To bring them to the market, power efficiency is important. Although the capacitive coupling scheme can keep the efficiency high while running, it is considered difficult to achieve high efficiency compared to the magnetic coupling scheme, because the system needs to take high frequency to reduce coupling loss. Therefore, we fabricate a proof-of-concept model and evaluate its performance by experiment. The model achieves 84 % of power efficiency measured from DC input of RF power generator to DC load output when the system transmits 360 W DC power at 6.78 MHz. Keywords - Capacitive coupling, Drone, Electric vehicle, Wireless power transfer.