An inductive charger with a large air-gap

Abstract

This paper describes a new inductive charger circuit fur opportunity charging of electric vehicles in the future. The coupling transformer utilized features a very large air-gap that is comparable to the cross-sectional dimensions and hasn't heen considered in previous studies. The study proposes tu fully compensate the large leakage inductance of the windings using series capacitors and tu control the charging power using an additional d.c.-d.c. chopper at the output stage. The eddy current losses associated with the leakage flux and voltage stresses in the circuit are shown to he acceptable. The working principle of the proposed circuit is experimentally tested.

Experimental discussion on inductive type contactless power transfer system with boost or buck converter connected to rectifier

“…These functions are achieved by use of a rectifier and a chopper. However, a system simply connecting these two circuits [8] is large size and low efficiency. Since especially receiver side circuit is asked for a miniaturization [9], this system is not suitable.…”