FCEV용 100kW, 100kHz, 99% 소프트스위칭 부스트컨버터개발 및 성능 분석

This study proposes a 100 kW fuel cell direct-current (DC)-DC converter (FDC ) for fuel cell electric vehicle. The modular design is adopted for easy maintenance and power expansion in mass production. The two modules produce an output of 100 kW, and each module is composed of a two-phase interleaved boost converter and a zero-voltage transition (ZVT) cell. By using the ZVT cell, the proposed FDC can achieve soft switching. The proposed structure of the FDC alleviates switching loss, significantly increasing switching frequency to reduce the volume of passive components. To determine the market competitiveness of the proposed FDC, its volume, price, efficiency, and loss are compared with those of conventional FDC. Finally, the experimental performance of the 100 kW prototype is verified to confirm the validity of the proposed FDC. The full load efficiency and maximum efficiency of the FDC are 98.87% and 99.09%, respectively. Moreover, a power density of 27.2 kW/L is achieved.