Abstract:

The dynamic over-voltage in the series connection of IGBT(Insulated Gate Bipolar Transistor)of highvoltage and high-power inverter equipment is investigated,and a quick feedback controlling method based on the bang-bang control is presented to control the component voltages of the equipment,with the aim of restraining the dynamic over-voltage of two series components.Moreover,a feasible mutual circuit for feedback signals is pro-posed,according to the characteristics of controlling loops,to offer timely and precise on-of signals for the serial IGBT.The proposed method is finally applied to the frequency-varied control of an AC induction motor.The results indicate that the proposed controlling method meets the practical requirements of great controlling accuracy and high responding speed,and that the designed mutual circuit for feedback signals is of good expansibility．

Key words: dynamic over-voltage, Insulated Gate Bipolar Transistor, quick feedback control, self-feedback