Analysis of one phase loss operation of three-phase isolated buck matrix-type rectifier with a boost switch

In this paper, the one phase loss operation of the three-phase isolated buck matrix-type rectifier with integrated boost output stage is analyzed. During normal operation (three-phase operation) the boost switch is disabled and during one phase loss is enabled. The analysis of one phase loss with combination of buck and boost (buck+boost) operation shows that the converter is able to deliver two-third of rated power and regulate the output voltage with maximum output voltage drop less than 4 % of nominal output voltage with significantly smaller output capacitor comparing with conventional buck matrix-type rectifier. The performance of the converter in buck and buck+boost operation is evaluated and verified by simulations and experiments on a 5 kW prototype.