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Re: SISG
Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>
Hi,
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.
Cheers,
Terry
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?
Andrew
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)?
Andrew