Three inverter power unit

The utility model discloses an each looks unit of three level contravariant (b) ware (b) power unit all includes 3 IGBT, half bridge type module, the utility model discloses regard 1 IGBT, half bridge type module as the catching diode who contains 2 units, 2 half bridge type module of individual IGBT is connected with catching diode's positive pole as upper and lower bridge arm, the short circuit point that wherein is used as two units of last bridge arm IGBT half -bridge module, and the short circuit point of two units of bridge arm is connected with another catching diode's negative pole under being used as, 1 IGBT, half bridge type module and 2 half bridge type modules of IGBT of containing 2 unit catching diode are the article font arranges, places on the radiator, connects the IGBT each point and constitutes single -phase bridge through female the arranging of stromatolite, the utility model discloses the contravariant power unit of three level technique has characteristics such as mutual independence, simple, the low stray inductance of installation.