What are the advantages, if any, of using a gate driver as opposed to an Arduino and optocoupler to drive an IGBT?
- Robert JLv 72 months agoFavourite answer
If you are just switching a general load on & off, speed is not critical an an opto or a direct drive (with a logic level mosfet or IGBT is fine.
If you are trying to build such as a PWM system that switches significant power at high frequencies, a proper gate drive circuit is usually required as the gate capcitance of a power switching FET / IGBT can be quite high.
It needs a high-current drive to charge or discharge the gate quickly and ensure a fast transition between the on & off states, so minimal power is wasted as heat while the power device is partly on.
- billrussell42Lv 72 months ago
If you are driving with a high frequency, the opto would have trouble with the gate capacitance, which is driven by a transistor and resistor. It would switch fast in one direction and slow in the other.