SiC based Buck Boost Converter

An attempt has been made to analyze a current controlled buck-boost converter with a SiC diode using a software package ORCAD PSPICE. The simulation results indicate that both in charging mode as well as in discharging modes, the converter with SiC diode has a better performance compared to that with Si diode. The turn-on switching losses are found to be reduced to a great extent when SiC (CSD10060) diode as compared to that of the Si (MUR840) diode has been used. However, there is very little improvement for turn-off switching losses with a SiC diode. The SiC diodes reverse recovery losses have been found to be very low as compared to that of the Si diodes. This is because of very low or negligible value of the reverse recovery current flowing through SiC diode. Due to the reduction in the total losses comprising of switch and the diode losses in the case of the SiC (CSD10060) diode as compared to the Si (MUR840) diode, the overall efficiency of the buck boost converter is increased about 3 to 5 percent.