Inverter output power density increasing technologies for EV/HEV applications

We applied advanced heat dissipating technology to reduce heat resistances of the key devices to increase the output power density of the inverter. The IGBT modules were direct water-cooled, and the integrated DC-link capacitor was indirect water-cooled. We conducted the simulation and the test, which proved that reducing the heat resistances was effective to improve the output density of the inverter. The power density of the self-developed inverter was 14.8kw/L, and the power-to-weight ration reached to 10.5kW/kg.