Re: [TCML] SCR tesla coil

[David Petzer <davepetzer@xxxxxxxxx>]

It looks as though the turn on characteristics of these devices is allright. I do not see any turnoff times though. Turnoff might be a problem as they are designed to work in a 50Hz or 60Hz system.
 
Could be worth a try though.
 
David.


________________________________
From: Carl Noggle <cn@xxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx> 
Sent: Wednesday, 23 November 2011 2:11 AM
Subject: Re: [TCML] SCR tesla coil

According to the data sheet, the peak repetitive rate of rise is 500 amps/uSec.  This would seem to be reached with a TC operating at 167kHz (to achieve an omega of 10E6 for easy figuring) with 500 peak amps.  This would be a coil in the range of 1 kW.  The average and RMS current ratings are fine.  Somebody should try this.  Sounds like fun.

---Carl
> Dear List
> I understand the rate of change in current with time (dI/dt) in the switching device in a TC is considerable. Is it still the case that only The SCRs capable of handling such severe duty are those with "interdigitated" gate construction e.g GTOs or has modern SCR technology changed this. Would a modern modern hockey-puck SCR such as the one described  here http://www.ebay.co.uk/itm/Capsule-thyristor-N195CH12-390A-ITav-/320794404043?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item4ab0d624cbwith ratings of 1200V and 390A be of running at least a small TC would the turn-on still be too slow?
> 
> Jolyon
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