Auxiliary power unit with SiC device for railroad car

In this paper, an auxiliary power unit (APU) for railroad car, which is applied a resonant DC/DC converter and a single-switch boost converter with SiC device, is proposed. The proposed circuit adopts SiC device in order to overcome disadvantages of IGBT. Compared to IGBT, since SiC has smaller switching loss, SiC can be operated at higher switching frequency. Therefore, the proposed APU with SiC can reduce the output voltage ripple and improve the efficiency. The proposed APU of 40 kW prototype is validated through a computer-based simulation.