| Title |
Performance of an SiC-MOSFET Based 11-kW Bi-directional On-board Charger |
| Authors |
Sang-Youn Lee ; Woo-Seok Lee ; Jun-Young Lee ; Il-Oun Lee |
| DOI |
https://doi.org/10.6113/TKPE.2021.26.5.376 |
| Keywords |
On-board charger; Bi-directional power transfer; CLLLC resonant converter |
| Abstract |
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. |