An Electromagnetic Field Reduction Method for Inductive Power Transfer in Transportation System

Abstract

Currently, inductive power transfer (IPT) applications to transportations are being researched for safe and convenient power transmission [1], [2]. However, the IPT system for transportations require to use high electrical power. This means that high density of magnetic field would be generated during IPT system operation and some magnetic fields would be a leakage magnetic field. These leakage magnetic fields influence negative effects to human body or other electrical device. Therefore, an leakage field reduction method for high power IPT system is necessary. In this paper, an adaptive active shield system is proposed that can eliminate leakage magnetic field generated from source and pickup coil by using one shield coil. Canceling magnetic field strength is controlled by measuring source current of IPT system for effective magnetic field reduction.