Modelling the performance of a SiC-based synchronous boost converter using different conduction modes

A SiC-based synchronous boost DC/DC converter rated for 400 V to 800 V and 10 kW with high efficiency in a wide power range, especially at medium and light load, is designed and developed. The better switching performance of SiC MOSFETs allows the use of high switching frequency operation modes even at voltage close to 1 kV (previously avoided due to the high switching losses introduced by silicon IGBTs). The distribution of the converter losses at different conduction modes and frequencies is evaluated. Moreover, digital control makes easier modifications of the operation mode in order to optimize the efficiency for different loads. Consequently, different operation modes (conduction mode and switching frequency) for different loads are compared in order to provide a design guide to optimize the converter performance in all the power range.