Hi;
anyone used hp316(or equivalent) to protect IGBTs from high saturation voltage? I have some problem with false saturation fault with some
thank you in advance.
Kadir Soner
Do you mean Agilent's HCPL-316J gate-drive optocoupler? Or do you mean HP's older HCPL-3160 optocoupler?
Do you synchronize the /reset, is Vcc
One comment about IGBT desat protection. Whether the desat protection kicks in at 7V or lower, say at 4 to 5V, it should be taken very seriously. Most IGBTs are seriously out of the safe saturation region for voltages above 2.5 to 3 volts, and assuming adequate gate drive, such high Vce voltages indicate they are conducting excessive collector currents. The IGBT should not be operated under these conditions for more than a very short time. Take for example an irg4pc50u, which is a 600V 27A 80W part, with a voltage drop of 1.65V at 27A. You have to push 120 to 150A through this IGBT to get a 3V drop, which creates an unacceptable 360 to 450W power dissipation.
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