Re: [TCML] Spark gaps, Solid state switches and diodes

[Finn Hammer <f-h@xxxx>]

bartb skrev:
> Hi Mark,
>
> The 680 ohm seems "on the edge" and specific to your coil. Were you 
> trying to perform solid state forced quenching? This would be ok for 
> some coils to a degree, but could be very risky to say my 70kHz coil 
> that I'm running my SISG on where 330us is 3rd notch primary 
> quenching. The 4700 ohm provides plenty of ring time without an IGBT 
> energy crash and doesn't compromise charging.  I'm just curious what 
> you actually gain from setting  Roff so low?
>
> Best regards,
> Bart
I am running 680ohms on my CM600 T-Brisg

The quench time is dependant on gate capacitance, C1 value but also on 
current trough IGBT. The gate-emitter capacitance is pumping charge into 
the gate by each oscillation.

Cheers, Finn Hammer
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