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Re: [TCML] SCR tesla coil



Turnoff should be OK, since the whole waveform will decay to zero in less than the time of a half-cycle at 60 Hz. You will need to keep the gate turned on for at least the whole decay time, and have a back diode to pass the negative half-cycles. Should work. Have fun.

If you want a CW coil, FETs ro maybe IGBTs are it.

---Carl





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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