• The Transactions of the Korean Institute of Power Electronics
• /
• v.26 no.5
• /
• pp.376-379
• /
• 2021

The design and performance of a SiC-MOSFET-based 11-kW bi-directional on-board charger (OBC) for electric vehicles is presented. The OBC consists of a three-phase two-level AC/DC converter and a CLLLC resonant converter. All the power devices are implemented with SiC-MOSFETs to reduce the conduction losses generated in the OBC, and the DC-link voltage is designed to track the level of battery voltage in the forward and reverse powering modes. As a result, the CLLLC resonant converter always runs at the switching frequency near the resonant frequency, resulting in high-efficiency operation at the maximum powering modes. As the DC-link voltage varies according to the battery voltage, the AC/DC converter in the proposed OBC adopts an adaptive DC-link voltage controller. The performance of the proposed 11-kW OBC is verified by a prototype converter with the following specifications: three-phase 60-Hz 380-V input, 11-kW capacity, and battery voltage range of 214-413-V, resulting in the conversion efficiency of over 95.0-% in the forward and reverse powering modes.

• Proceedings of the KIPE Conference
• /
• 2020.08a
• /
• pp.22-24
• /
• 2020

본 논문은 11kW급 양방향 탑재형 충전기를 위한 CLLLC 공진 컨버터 설계에 대하여 발표한다. CLLLC 공진 컨버터의 공진 탱크 설계하였으며, 고효율화를 위하여 SiC-MOSFET을 사용하고, 배터리 전압에 따라 링크전압 가변 알고리즘과 동기정류기를 적용하였다. 그 결과를 바탕으로 프로토타입을 제작하여 실험한 결과를 발표한다.