I have IPM ( PM75CLA120). This module is first connected to the dead time circuit then connected to ds1104. The IGBTswitches in this module are off at high level while they ara on in low-level. In the first case without the gate signals, all the IGBT switches in the lower are on. The DC bus voltage increases 5 times the reference voltage when the gate signals are sent. And the circuit draws a high current from the grid. what could be the reason for this situation. Do you have any of these situations?