전기자동차 배터리 충방전용 3상 인터리브드 양방향 DC-DC 컨버터의 스위칭 손실 최소화

Abstract

This paper deals with a design and control method of three-phase interleaved bidirectional DC-DC converter for electric vehicle battery charging and discharging which is applicable to V2G(Vehicle to Grid) system. A typical non-isolated bidirectional DC-DC converter technology is the combination of a buck converter and a boost converter in a half-bridge configuration. The converter can be designed to operate in discontinuous or continuous conducting mode according to the required performance. This paper proposes a new softswitching method for the bidirectional converter in discontinuous mode operation to achieve high efficiency and minimized inductors. The method provides zero-voltage or zero-current switching condition for the switches. Simulation and experimental results show the usefulness of the proposed scheme. It is expected that the proposed method can be used for high efficient power converter.