All-SiC power module for photovoltaic Power Conditioner System

We developed the All-SiC power module for photovoltaic Power Conditioner System (PCS). The All-SiC module has SiC-MOSFET (Metal Oxide Semiconductor Field Effect Transistor) and SiC-SBD (Schottky Barrier Diode) which are sandwiched between SiN (Silicon Nitride) substrate and power circuit board. Thick copper block which is attached SiN substrate enhances low thermal resistance and Cu pin which is connected power circuit board to semiconductor realizes high power density. Therefore, this new structural design achieves compact size of the All-SiC module. Module downsizing dramatically effects for module inductance property. Low inductance design enables high frequency switching with lower noise and lower switching loss. Furthermore, the developed epoxy resin structure is more reliable at high temperature than the conventional structure. At the result of the All-SiC development which is installed 20 kW photovoltaic PCS, 1/4 of volume downsizing and 99.0% of efficiency is achieved.