Power tube gate driving circuit and sectional driving method

The invention provides a power tube gate driving circuit and a sectional driving method. The power tube gate driving circuit comprises a pre-driving stage, an output voltage comparison unit and a tri-state compensation driving stage, wherein the pre-driving stage is used for controlling rising time and falling time of a driving signal, so as to switching on or off an insulated gate power switching device; the output voltage comparison unit is used for comparing voltage of the driving signal output by the pre-driving stage with a set threshold value, and then outputting a switching control signal; and the tri-state compensation driving stage is used for charging or discharging a driving output port in a compensatory manner under the enabling action of a switching control signal and the action of the switching control signal output by the output voltage comparison unit, and accelerating the driving output port to pull up or pull down, so as to fully switching on or off the insulated gate power switching device. The power tube gate driving circuit is simple in structure, requires no resistance and capacitance devices, reduces domain area, and has the advantages that gate charging/discharging speed is less affected by variation of capacitive loads, the efficiency is high, the driving circuit is safe and reliable, and the like. The sectional driving method can reduce EMI effectively and reliably.