Transmitter coil system without ferrite in wireless power transfer

Abstract

A transmitter (Tx) coil system without ferrite was designed and fabricated for use in wireless power transfer (WPT) based on magnetic induction. The Tx coil system consists of an active coil, which is directly connected to the source, and a parasitic coil, which replaces the ferrite. The effects of the parasitic coil parameters, i.e. size, number of turns, and distance from the active coil, on the WPT performance were investigated in terms of the utility value, which was developed based on the power transmission efficiency and shielding effectiveness. The proposed Tx coil system was fabricated, and its performance was measured. The measured results show that the proposed Tx coil system performs better than a conventional Tx coil in terms of the utility value. © The Institution of Engineering and Technology 2016.