Due to strong and high‐frequency magnetic field between transmitting (Tx) and receiving (Rx) coils of wireless stationary electric vehicle (EV) chargers, there is the possibility of them catching fire from debris of a metal piece in the magnetic field, which is inductively heated during charging. Position detection (POD) of misalignment between Tx and Rx is also needed to deliver maximum power at the optimum position.
In this chapter, the FOD and POD are explained, introducing dual‐purpose non‐overlapped coil sets for both FOD and POD, which were invented by Chun T. Rim. Not only the existence of conductive object debris on a Tx coil but also the location of them are determined by an induced voltage difference of the coil sets. By measuring the induced voltage of the coil sets, displacements between a Tx coil and an Rx coil can also be found to inform drivers of their EV alignments. Moreover, the proposed FOD and POD devices do not arise from any power losses in inductive power transfer (IPT).
The proposed non‐overlapped coil sets have been demonstrated by simulations and experiments for a prototype coil set. Throughout the experiments, the induced voltage difference of a coil set shows 2.19 mV (ideally zero) without foreign objects while the induced voltage difference significantly increases by 78.2 mV, which is about 35 times that of the value without objects, when eight conductive coins are located on a Tx coil. Also it is found that POD can be achieved by measuring the variation of the induced voltages in coil sets when an Rx coil moves on a Tx coil.
This chapter is based on the paper by M.R. Sonapreetha. S.Y. Jeong, S.Y. Choi, and C.T. Rim, “Dual‐purpose non‐overlapped coil sets as foreign object and vehicle location detections for wireless stationary EV Chargers,” in IEEE 2015 WoW, June 2015, pp. 1–7.
Foreign Object Detection
2017-07-11
13 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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