Re: [TCML] Nothing like first light

[Finn Hammer <f-h@xxxx>]

bartb skrev:
> Makes sense. Now I understand your triggering scheme and it's actually 
> easy (harder I'm sure in the real world).
Not really.....
> Considering a quantity of 6 Mark Dunn boards in series, I still see 
> this as no different. The triggering is still a single SCR. Something 
> I'm going to have to give a try (starting with only the trigger, not 
> the audio modulation). Baby steps as they say.
You need one SCR per IGBT.
The SCR bypasses the Sidac`s, but not the TVZ at the bottom of the string.
One SCR across the whole stack of boards will bypass all but the bottom 
IGBT, thus disabling the upper ones from gate drive, and subsequent turn on.
Current path will then remain in the SCR and Sidac, never to be 
overtaken by IGBT string.

Sorry, no free lunch here.

However, although SCR`s are quite pricy, It`s still only a few bucks 
extra per section. 1 SCR and 1 Torus.

Cheers, Finn Hammer
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