T-타입 컨버터를 사용한 전기차 탑재형 충전기 설계

Abstract

Recently, demand for eco-friendly electric vehicles is increasing due to increased interest in the environment and implementation of eco-friendly policies. Many researches have been made on various topologies and control schemes that enable fast charging and high charging efficiency of electric vehicle batteries. This paper propses a T-type structure charger to improve the capacity and efficiency of the OBC mounted on the vehicle as the electric vehicle charger. The proposed OBC reduces system THD through multi-level output, reducing filter size and improving power quality and system reliability. The operation sequence and power circuit design method of T-type OBC are presented, and the operation characteristics and controller are described by dividing them into PFC rectifier and DC-DC converter. In addition, a method of designing a controller that minimizes charging current THD was proposed to improve battery life and reduce filter size. The operation characteristics of the PFC rectifier and DC-DC converter of the designed OBC and the CC-CV mode operation of the battery charger were verified through simulation.