A Novel Type of Position Detector for a Wireless EV Charger

EV (Electric vehicle) solves the global warming caused by carbon dioxide, because low-loss drive under CO2/NOx free. The wireless battery charger is a promising system because of easy and safe to use for a broad range of users including the elderly. These advantages show that WPT can be the next generation charging system. However, under the case of wireless charging of EVs, there are problems such as deterioration of transfer power or efficiency due to the coil-misalignment. This paper presents a novel position detecting method with a simple configuration that provides the necessary accuracy by using a differential voltage of the auxiliary detection coils.