IGBT Gate Current

Discussion in 'The Projects Forum' started by onceinalifetim, Oct 17, 2014.

  1. onceinalifetim

    Thread Starter New Member

    Feb 9, 2014
    currently am doing a project. i need to choose driver for my igbt for switching performance.. so i need to calculate the gate current. i would like to how to calculate the Ige and Igc and how to find out the driver output voltage??
  2. JDT

    Well-Known Member

    Feb 12, 2009
    The gate is a capacitor. You could do all the calculations but easier just to choose a gate driver IC that can produce a peak output current in the region of 2 - 3A and the job is done - for most commonly available IGBTs.

    This peak current comes from the bypass capacitor across the supply pins of the driver, So make sure it is a low inductive type and fitted as close as possible to the IC. Gate wires should be as short as possible.

    Make sure the driver IC has an "undervolt lockout" incorporated. This is to prevent the IGBT from partially turning on if the driver voltage is too low (during power-up or down).
  3. ronv

    AAC Fanatic!

    Nov 12, 2008
    You will find the gate charge in the data sheet of the IGBT. Then you can use the formula.