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Original poster: "Andrew Bonnell" <andrewbonnell@xxxxxxxxx>

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)?