Abstract:
A 4-SiC hybrid three-level active neutral point clamped (3L-ANPC) inverter and dedicate modulation scheme with the loss balance distribution characteristic were proposed. The turn-on switching loss was distributed to the SiC MOSFET with a lower conduction loss. Moreover, the turn-off switching loss was distributed to the SiC MOSFET with a higher conduction loss. In addition, dual freewheeling paths were used to lower the conduction losses during freewheeling modes. Both the operation principle and working states were analyzed in detail. The calculated power losses of the proposed new 4-SiC hybrid 3L-ANPC inverter and the conventional 4-SiC hybrid 3L-ANPC inverter were addressed and compared. Finally, a 2kW prototype was built. Experimental results and analysis show that compared with the conventional 4-SiC hybrid 3L-ANPC inverter, the proposed 4-SiC 3L-ANPC inverter and dedicate modulation scheme exhibit higher efficiency and better loss balance performance.