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Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
I know one way is to run the coil on the upper pole, but frequency on a little coil is a concen and I would not want to do this unless absolutely necessary. Is there a way how to accomplish this on the lower pole, while maintaining ZCS (or at least near-ZCS)? I'm afraid its not...
You can avoid overshoot or at least decrease it by tuning your primary res frequency closer to that of the secondary, i.e. not too low.
During the falling part of the envelope, energy from the primary tank is dumped to the secondary in addition to the power that is supplied from the bus. This can increases arc length, so that avoiding overshoot might degrade performance.
For a QCW, overshoot is a serious problem, since it will trigger the OCD and not allow running the coil at high power levels for a longer time.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Thanks for the reply Udo. My goal is to get longest sparks possible from a little secondary without sparkovers, the "traditional" way (ie. not a QCW coil). I think running longer ON times with overshoot-free current envelope should help to build longer sparks with lower voltage, but I'm not really sure. I might just try the lower pole and see what it can do.
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[DR tech] How to get a current envelope without overshoot on a little coil?
