A push-pull converter based BD-IPT system for wireless grid integration of EVs

Abstract

A low cost push-pull converter based bi-directional inductive power transfer (BD-IPT) system suitable for wireless integration of electric vehicles (EVs) with the utility grid is presented. The proposed system has a number of advantages over traditional BD-IPT systems, due mainly to its inherent ability to maintain zero voltage switching (ZVS) operation over a wide range of operating conditions. The operating principles of the push-pull converter based BD-IPT system, which uses DD-type magnetic pads, is discussed and the behavior under varying spatial displacements between the pads is investigated. The viability of the proposed BD-IPT system is verified through simulations of a 3.7 kW system and, results are compared with a traditional parallel tuning BD-IPT system, to show that it is efficient and can maintain ZVS under all operating conditions; thus providing a low cost and simple solution for wireless grid integration of single or multiple EVs.