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Registered Member #3535
Joined: Wed Dec 22 2010, 05:11PM
Location:
Posts: 2
Hi, I have problem with output signal to primary coil. My Tesla coil parameter: IGBT full bridge on SKM300GB 124D MMC 600nF 6kV Primary 9 turns 15mm Cu tube Secondary and toroids like DRSSTC 2 by Steve Ward Driver - Predikter with intermediate bridge, GDT on core TX58 3E25 1:1:1:1:1, 20 turns 1mm wire
Registered Member #2288
Joined: Wed Aug 12 2009, 10:42PM
Location: Cambridge, MA
Posts: 179
What exactly is the problem? Is this an un-loaded bridge output? It is perfectly normal for unloaded bridges to severely ring like this if the ringing is your concern. When you add a primary circuit, it will take care of that (although you still need to get the prediktor timings right in order to avoid micro-spikes at switch points).
It also looks like your timing may be severely off since it is not switching at the zero point, check your delay pots and if not that, perhaps you need more or less inductance in your phase lead circuit.
Registered Member #2288
Joined: Wed Aug 12 2009, 10:42PM
Location: Cambridge, MA
Posts: 179
Since it is ringing just as much on low-side, which should not happen to this degree due to the reverse recovery diode in the transistors, I'm guessing that perhaps it is an artifact of a ground loop in your scope. How is the scope clip grounded? Try grounding it directly at the negative side of the input to the half bridge being measured, and then scoping directly at the transistor where the output comes from. Make sure you're on a floating power supply when you do this.
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DRSSTC problem
