The IGBT gate is capacitive, and the higher the power of the tube input capacitance, the larger (generally hundreds to thousands of PF). The requirements for the drive circuit are that the dynamic output impedance is small enough to meet the needs of the pull and fill current of the IGBT, and the voltage is greater than or equal to the opening voltage of the IGBT. Otherwise, it will reduce the switching speed of the pipe, slow the slope of the rising edge and the falling edge, and even cannot be switched on.