[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]


Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>


SCRs tend to have low dI/dT. If the current through them increases too fast, they die. Perhaps there are SCRs out there that would work though.

A zenor/SCR may work instead of the SIDACs for triggering.

We actually don't want the whole gap to turn off just because the current goes through zero. It needs to stay on hard for like 400uS regardless of the current or its direction.



At 09:00 AM 5/27/2006, you wrote:
I probably should have clarified a bit. Why is a SIDAC/IGBT setup used as opposed to a zener diode/SCR setup used? (trigger/power switch). Wouldn't the SCR automatically turn off when the current dropped below a certain level, sort of like a spark gap?


On 5/27/06, Andrew Bonnell <<mailto:andrewbonnell@xxxxxxxxx>andrewbonnell@xxxxxxxxx> wrote: Why does the SISG use SIDACS to trigger an IGBT, rather than a triac, or back to back SCRs with a zener diode on the gate(s)?