Hello Everyone..! I am using GT60N321 Toshiba make IGBT to control 3 phase motor. I have used 6 IGBTs in full bridge configuration. Gate pulses are given from IR2101 IC (10Volts Output) which in turn driven from Arduino mega. 550Volts DC to be connected at collector terminal of IGBTs. We were expecting 400V AC output. But we are not getting full output as expected. Output is limited to 22V. Please suggest what could have gone wrong? Suggestion with regard to Schematic, Circuit diagram, Code will be appreciated. My circuit diagram for your reference has been attached. 
