Re: SSTC - IGBT

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

Original poster: dhmccauley-at-spacecatlighting-dot-com 

It is possible, but will be more difficult than using FETs.  For hard
switching applications, (as the datasheet indicates), these would be good
for up to 40kHz.  40kHz is much too low
a frequency for your typical SSTC.  You'll need to have a very large coil
and/or terminal capacitance to run that frequency.
They are good for higher frequencies, but you need to have a resonant type
switcher.  This is particularly due to the poor turn-off time of the device.
In hard switching, your current
waveform doesn't pass through zero when the voltage is zero on the bridge.
Therefore, because the turn-off time is excessive, these devices will
dissipate heat during that conducting period.
And just because you have a SSTC doesn't guarantee ZCS (zero current
switching) operation.  SSTCs due by their nature have a sinusoidal current,
but it doesn't necessarily pass
through zero when the voltage is zero.

Also, IGBTs are much less tolerant to heat.  FETs tend to spread heat
evently over the semiconductor device, while IGBTs tend to concentrate heat
over the junction much more.

Dan


 > Hi Guys,
 >
 > Would it be possible to build a full bridge of GA100NA60U? These are
IGBTS.
 > The data sheet is here
 > http://www.irf-dot-com/product-info/datasheets/data/ga100na60u.pdf.
 >
 > I have 8 of these units to hand.
 >
 > Adam
 >
 >
 >
 >
 >