Unified Platform with Single- and 3- Phase Input for Light Industrial Application Using SiC Power Device

To improve the design of light industrial applications, such as showcase fridge and commercial air-conditioning (CAC) systems, the focus is on reducing the size and weight of boost PFC inductors, and on unifying the design platform for different input voltages at the same power rating. Increasing switching frequency is the key, enabled by new-generation IGBTs and SiC diodes, to reduce the boost PFC inductor size for power ratings below 7 HP. Using SiC diodes for PFC enables switching frequency to be increased to 40 kHz with the same output power. Operating with SiC MOSFETs at 540 V DC link voltage in PFC and inverter stages will result in slightly lower total power losses than using Si-IGBTs at 380 V DC link voltage, making it possible to use the same design in a unified platform for both single- and 3-phase input