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Re: IGBT Recommendations
Original poster: "Daniel McCauley" <dhmccauley@xxxxxxxxxxxxxxxxxxxxxxxxxx>
Typically, the 600V IGBTs will work fine for most low to mid power
DRSSTCs. There are several different types available
by Fairchild, IXYS, and some others. The ones Terry is using for his
SISG are excellent choices as well. However, with the TO-247
package, you will really need to be smart about how to heatsink them.
As far as audio modulation goes, typically, low side modulation is
performed by pulse width modulating the gate drive signal
to the bridge. High side audio modulation is a bit more difficult,
although would probably give much better audio quality. You could
either modulate it with a switching device linearly (such as in
conjuction with a push-pull audio transformer on the DC bridge voltage) or
even use a MOSFET or IGBT and pulse width modulate that. There are
many different ways to do it. I would recommend low side first
though since its easiest to implement.
Hope this helps . . .
Daniel McCauley
Check out "DRSSTC : Building the Modern Day Tesla Coil" Book
Available now at http://www.easternvoltageresearch.com
Does anybody have any recommendations for an IGBT to use in an ~1800VA DRSSTC?
On a DRSSTC is it better to go with a higher voltage to get lower
losses due to I*I*R?
On Richie Burnett's page, his experiments with a DRSSTC (driven by
MOSFETs) showed that when the bridge is fed with a half wave from a
half wave rectifier, the TC buzzes at 60 Hz and when it is fed full
rectified power, it buzzes at 120 Hz. If you place an IGBT on the
power rails feeding the bridge, could you make the TC play music by
pulsing power to the bridge through the IGBT to feed the bridge a
wave form of a specific frequency to make the coil "buzz" out the
music so to speak?
+_________________________
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Bridge/resonator
audio signal |
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-________IGBT_____________ |