RE: [TCML] Re: IGBT CM600 max current ?

["Gary Peterson" <g.peterson@xxxxxxxxxxxx>]

Greg,

> The quote mentioned below was *not* from me.  Believe that was Finn's.

Yes, I noticed my mistake after transmission.  My apology to all.

> . . . the transistors' RMS rating will have been exceeded long before the
break rate reached 50,000BPS . . .

Is there any way I can get the rate up to 50,000BPS or even the
18,000-25,000BPS region with the CM600, perhaps by reducing the applied
voltage?  Is there another IGBT that would better for me?  Would a power
MOSFET be better?  I really don't need a whole lot of power--150 to 300
watts would suffice.  I'm mainly seeking CW operation with a rapid rise time
and cutoff.

G.P.

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Greg Leyh
Sent: Saturday, December 13, 2008 1:00 PM
To: tesla@xxxxxxxxxx
Subject: [TCML] Re: IGBT CM600 max current ?

Hi Gary,

The quote mentioned below was *not* from me.  Believe that was Finn's.

To answer your first question:
'So assuming an adequate DC power supply and 50 kHz as the resonant 
frequency of your Tesla coil's secondary (with a slightly larger topload 
attached), then a break rate of 50,000BPS will be no problem as long as 
the RMS current does not exceed the transistor's RMS current rating, 
correct?  G.P.'

That is correct.  But of course the transistors' RMS rating will have 
been exceeded long before the break rate reached 50,000BPS.  Probably 
around 1,000 to 2,000BPS.   GL



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