The aim of this project is to develop a fast inductive charging system that will enable high rate energy transfers at 40 kW power rate through 100mm wide gap and an efficiency of 87-92%.
A lot of companies develop and manufacture charging stations based on cable transmission of electric power to the automobile.
The efficiency of this method is in the range of 90 – 94 % and the best performances obtained through cable charging enable a full battery charge in 30 minutes with a 50 kW power rate.
The transfer of such an amount of energy introduces technical problems for contact charging systems with connectors:
- Danger from the relatively high voltages,
- Easy wear-out of the electrical current-carrying parts,
- Handling difficulties associated with the use of heavy cables
- Safety issues during operation in humid weather, when the charging station is unprotected.
The contactless charging of vehicle batteries offers the convenience of very easy maintenance and the possibility for application not only in charging stations, but also on parking lots, garages, bus stops (public transportation), crossings (while waiting at traffic lights) and even on intercity roads or highways.
Nissan is working on inductive charging technology. Misalignment tolerance is their main concern. Their inductive charging terminals enable 3kW transfers, to allow for an over-night charge of the vehicle. The efficiency is not less 80% for 100 mm gap.
Successful demonstration of Inductive Power Transfer (IPT) system for static and dynamic charging of the battery stack of EV’s was made on June 2013 in Technical University of Gabrovo, Bulgaria, as a part of the researched and development plan of FastInCharge project. It was used specially designed converter. Main principle that all IPT systems use is so called “loosely coupled” high frequency transformer.
A mobile system has been designed and developed, allowing the translation of the secondary coil designed by TUG, in the direction perpendicular to the vehicle movement. The solution is intended to be competitive in terms of robustness, weight and cost. Read more
NTUA's role within the FastInCharge project was to define the energy charging requirements of the static and on-route fast inductive chargers and to assess the impact of this additional charging demand in the distribution grid. Moreover NTUA developed the energy management system that has allowed the efficient monitoring and management of fast inductive charging stations. Read more