 2 DRSSTC questions
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DoS
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Sun Apr 02 2006, 11:33AM
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Registered Member #360
Joined: Sun Apr 02 2006, 12:13AM
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Posts: 12
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1) What is most probably going to happen if I change, let's say 110x300mm secondary wound with 0.25mm diameter wire to same size secondary but thinner wire (0.15mm) and thus there are more turns of course?
2) If I use TO247 IGBTs I have two possibilities: a) to put them on a grounded heatsink, but then I'd have to isolate the IGBTs electrically (worse thermal conduction), b) to put them on separate ungrounded heatsink and put them directly on a heatsink with thermal compound between them (better thermal conduction). Which of them is better?
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DrZoidberg
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Registered Member #350
Joined: Mon Mar 27 2006, 05:14PM
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I'll try to calculate that through. Correct me if I'm wrong which I probably am.
If you change the wire size from 0.25mm to 0.15mm you could fit 1.67 times as many turns on your secondary.
The inductivity and the resistance would both increase by a factor of 1.67 * 1.67 = 2.78.
So the output voltage increases by 1.67 and the output current and resonance frequency decrease by 1.67.
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HV Enthusiast
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Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
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I'd use separate heatsinks so you can maximize your thermal conductivity between the TO-247 and heatsink. Remember, the biggest hurdle in using TO-247s for DRSSTCs is removing the heat, so you should be doing everything to maximize this heat transfer. Electrically insulated pads will have significant impact on the thermal conductivity.
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