Author Topic: DRSSTC with litz-wire primary and 40 x TO247 IGBT H-Bridge  (Read 2878 times)

Offline davekni

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Re: DRSSTC with litz-wire primary and 40 x TO247 IGBT H-Bridge
« Reply #20 on: October 17, 2020, 08:23:11 PM »
I have two secondary-only resonant frequencies in my notes.  The one I think is more reliably is 93.65kHz, which implies 42.5pF on the 68.0mH secondary inductance.  Also have 92.2kHz noted once, but don't recall that test.

Coupling is about 0.140 or 0.141.  I've had trouble getting really consistent measurements of coupling.  Was originally 0.157, but had arcs to the secondary, so had to drop the primary coil position a bit.

I've been using 0.018 ohms for total primary series resistance in my simulations.  DC resistance is lower than that.

Bus voltage is adjustable, in the range of 300V to 400V for all tests so far.  I think it was 330V for the last scope trace I shared.

I've experimented with many breakout points.  The latest one for 3m arcs was an angled foil cone with 20mm of 0.5mm diameter tungsten rod protruding from the cone.  The tip was 60mm above the toroid top and perhaps 30mm beyond radially.  I didn't measure precisely.  It was tiny compared to the toroid size.  Worked better for long arcs than my previous breakout that was around 600mm long.

MMC is larger for this long-arc test, 690nF.  Other parameters are still good, 6.95uH primary including leads, 826mm OD toroid, etc.
David Knierim

High Voltage Forum

Re: DRSSTC with litz-wire primary and 40 x TO247 IGBT H-Bridge
« Reply #20 on: October 17, 2020, 08:23:11 PM »

 


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