Re: IGBT's in Place of MOSFET's

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Mitchell" <electrontube-at-sbcglobal-dot-net> 

200khz is what my secondary will be resonating at...

Regards - Jim Mitchell
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, January 31, 2004 7:55 PM
Subject: Re: IGBT's in Place of MOSFET's


 > Original poster: "gtyler" <gtyler-at-drummond-dot-org.za>
 >
 > Look at the gate capacitance of the respective devices and also the
 > miller capacitance. IGBT's are usually much less of a load than fets,
 > even for higher current ratings. What frequency are you running at?
 > Igbt's can be less efficient at higher frequencies due to tail current
 > increasing switching loss, but have less of a problem if the load is
 > capacitive, which can kill fets.
 >
 > George
 >
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Saturday, January 31, 2004 8:23 PM
 > Subject: IGBT's in Place of MOSFET's
 >
 >
 >  > Original poster: "Jim Mitchell" <electrontube-at-sbcglobal-dot-net>
 >  >
 >  > Hi,
 >  >
 >  > Today after blowing fets in my H bridge due to a bad tuning pot on a
 > TL494,
 >  > Steve Ward suggested that I could use some IGBT's instead of the fets.
 > I
 >  > have a good supply of IGBTs and they are beefier then the mosfets I
 > was
 >  > using.  My question is, how can I be sure that four of these IGBT's
 > isnt
 >  > going to overload my gate drive IC's?  I have 30N6S2 IGBT's and my
 > current
 >  > H bridge is full of 44N50's.  Does anyone have any advice?
 >  >
 >  > Regards - Jim Mitchell
 >  >
 >  >
 >  >
 >
 >