| Abstract |
This article focuses on Wireless Power Transfer, adapted to a dynamic charging infrastructure. Theauthors present a 2.4 kW prototype of electric road, designed according to an analysis based on phasordiagrams for the sizing of the key-elements of the SS resonant converter. It involves 50-cm squarecoils, with an air-gap of 15 cm between the ground side and the on-board side. The system developeduses a ZPA method control on both ground and on-board parts of the air-transformer, implementedwith a varying-frequency inverter. The experimental results show a very steady and stable on-boardvoltage despite the evolutive magnetic coupling with the displacement of the load, from -18 cm to18 cm. The efficiency of the system reaches 91 \% at the best operating point, and never falls below70 \% for the main regime. The efficiency is also very stable with displacement. The system has a gooddynamic response: the switch between one coil to the next during the motion of the load does notexceed 4 ms, and the adaptive response to a 280 W output power step lasts only 1.1 ms before thepermanent regime. |
