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We have developed a small-volume, high-power-output inverter with a high output power density using SiC power devices. To fully utilize the advantages of SiC power devices, it is necessary to reduce the inductance of the power module. This is done by using a double-layer ceramic substrate, attaining a low inductance of 5 nH. A double pulse test was carried out up to 60 A under a DC voltage of 600 V. The low inductance greatly reduced the surge voltage and the oscillation at the switching transient. The SiC inverter with a volume of 250 cc was assembled using three of the power modules. The cooling performance of the inverter was evaluated at a loss equivalent to an output power of 10 kW, and it was found that the inverter can output 10 kW at a junction temperature (Tj) of about 200°C.

A Compact 5-nH One-Phase-Leg SiC Power Module for a 600V-60A-40W/cc Inverter