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Design and optimization of a multi-coil system for inductive charging with small air gap

: Joffe, C.; Rosskopf, A.; Ehrlich, S.; Dobmeier, C.; März, M.


APEC 2016, thirty first Annual IEEE Applied Power Electronics Conference and Exposition : March 20-24, 2016, Long Beach Convention Center - Long Beach, California
Piscataway, NJ: IEEE, 2016
ISBN: 978-1-4673-9550-2 (electronic)
ISBN: 978-1-4673-8393-6 (print)
ISBN: 978-1-4673-8394-3 (USB)
ISBN: 978-1-4673-9551-9 (print)
Annual Applied Power Electronics Conference and Exposition (APEC) <31, 2016, Long Beach/Calif.>
Fraunhofer IISB ()

This paper focuses on the magnetic design of a multi-coil system for an inductive power transfer (IPT) system for charging electric vehicles with a small air gap between transmitter and receiver coils. Thus, external stray fields can be reduced and the expense of material decreases compared to systems using a large air gap. The magnetic design of the multi-coil system is optimized for the given package space of the vehicle by using a new coupled numeric approach and considering additional coil geometries as well as alternative winding structures. The result of this design process presents the basis to build up a prototype system, including an additional secondary side DC/DC converter. Therewith, an efficiency between 92% and 96% at an output power of up to 3.5kW is achieved.