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Registered Member #2922
Joined: Sun Jun 13 2010, 12:08AM
Location:
Posts: 226
I'm working in a new sstc that will be a small drsstc, i have here the irg4pc50ud igbt. I want to know if this igbt run at 270khz, because this is the frequency of my secondary?
see a video of the construction and the firsts results of the project: click here
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Thats iffy. The big thing will be how well your DRSSTC will soft-switch as well as how good you can take the heat out of this device. If you get a good tune, with short pulsewidth, than you should be okay.
Hard switching - its rated only to 40kHz, but for resonant switching (which a properly tuned and set-up DRSSTC should do with zero crossing current), it states operation 200kHz+.
Can you reduce the fres? 100kHz would really reduce switching losses and you can get this with a secondary with finer wire.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
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Posts: 3068
I always recommend a heatsink that has lots of mass to it - like a solid chunk of aluminum with fins. Also, be sure to have a good thermal interface, such as thermal grease etc... Very important!
Also, note the transient heating (pulse-by-pulse) of the die may be more of a concern than steady-state heating. In this case, running at lower pulsewidths would be beneficial to minimizing the pulse transient heating of the die.
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
If you build and tune it right you should not need more than 100uS. I have coils that pump out 5 feet at 100uS if you want big sparks the key thing is a high bus voltage, 400VDC+ (for full bridge) 800VDC+ (for half bridge) and good tuning.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
I agree. If you have a good tuning point you don't need much pulsewidth.
My microBrute DRSSTC Kit (which stands only 11 inches tall) with a proper tune can produce over 20" arc (with a perfect tune) at only 85us with about 300VDC bus voltage. Key is to have a really good tune point.
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new drsstc
