Sensorless Vehicle Detection Using Vehicle Side Voltage Pulses for In-motion WPT

In order to put in-motion wireless power transfer to practical application, it is necessary to establish the technology of detecting the vehicle side coil from the road side coil. Search pulse method is one of the previous methods that can detect the vehicle side coil by measuring the current of the road side coil. However, in the conventional method, the road side coil emits search pulses continually even when vehicles rarely pass over the road side coil. Here the authors have proposed a new method that search pulses are emitted from the vehicle side coil, and verified by simulation and experiments that the proposed method is superior to the conventional method in terms of the standby power and the sensitivity of detection.