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  • Double coupling dynamic inductive power transfer systems for electric vehicles charging applications
    Publication . Torres, Miguel Moreira; Perdigão, Marina Mendes Sargento Domingues
    Electric vehicles (EV)s are growing in popularity, but frequent recharging is inconve- nient. Wireless power transfer (WPT) technology offers a solution, allowing EVs to be charged without contact. A WPT technology that has been widely used for static charging of EVs is inductive power transfer (IPT). In order to charge EVs in motion, a dynamic IPT (DIPT) technology is required, therefore this technology uses special- ized charging infrastructure, including coils implemented in the road, to transfer en- ergy to the moving EV. In DIPT, inherent displacements in the travel direction, as well as the already expected misalignments (vertical and lateral) lead to different coupling conditions (no-coupling to full-coupling). A double coupling in-Wheel IPT (inWIPT) system is used for transferring energy from the off-board to the on-board side of EV using the wheel as an intermediary. The proposed system incorporates two magnetic couplers (MC) for the energy transfer between the off-board side to the wheel and another from the wheel to the on-board side, keeping the air gap to a minimum and almost independent of the vehicle type. The S-S-S resonant compensation, already analysed for the static inWIPT application, does not present a viable solution for DIPT. This master’s work presents the study of adopted strategies to assess the applicabil- ity and performance of the inWIPT system in DIPT. Therefore, a mathematical anal- ysis of resonant compensations such as S-S-S, LCL-S-S and LCC-S-S is carried out in DIPT operation to identify their intrinsic characteristics for enabling the limitation of currents and voltages on the transmitter side to acceptable values. Additionally, it in- cludes experimental measurements and analysis of self/mutual inductance and cou- pling profiles for different geometries of the proposed system to assess their tolerance under specific DIPT conditions. The experimental prototype using LCL-S-S topology and the MATLAB/Simulink simulations validate the full range of coupling and load conditions, from full to no-coupling.
    2024-03-12Master thesis Open access Show more