Ultra-compact and light weight intelligent power semiconductor module for hybrid system

Recently, hybrid electric vehicles are required high power with high fuel efficiency and comfortable large cabin space. An ultra compact intelligent power module for two-motor hybrid electric vehicles which integrates one back-boost chopper and an inverter for a traction motor, an inverter for a power generator has been developed. The module is the world's first released module which has a direct liquid cooling structure with a solder-joined aluminium heat sink. The module achieves a 30-% reduction of volume and a 60-% reduction of weight compared to our conventional models. A heat sink with high cooling capacity and a high-strength solder were newly developed to establish the structure. The module is designed for 700 V/ 400 kVA system and it has an on-chip self protection functions and serial communication interface with a master control unit.