DEVICE AND METHOD OF CONTROLLING A GATE OF A THREE-LEVEL INVERTER

摘要

In a gate control device for self-arc extinction elements (T1) to (T4) and self-arc extinction elements (T5) and (T6) connected in reverse parallel between the respective both terminals of clamp diodes (D5) and (D6), individually, there are provided a PWM circuit (2) that generates conduction control commands (SP) and (SN), and a gate control circuit (3) including a delay circuit group that generates gate signals (ST1) to (ST6) with respect to the respective self-arc extinction elements on the basis of the respective conduction control commands. The self-arc extinction elements (T3) and (T5) are rendered conductive at the same time under control, and the self-arc extinction elements (T2) and (T6) are rendered conductive at the same time under control.