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New DRSSTC first light and a question



Original poster: Skip Greiner <sgreiner@xxxxxxxxx>

Hi all
Here is a quick spec on the new DRSSTC
I used Dan's full H bridge driver but with primary feedback driving four IRG4PC40W IGBTs
Secondary: Dia: 4.5", 1000 turns #26
Primary: Dia: 6.5", 5 turns #10
Cap: .04
Top load: 2" x 8" toroid
Resonant Freq: 285 khz
Power: DC using a full wave bridge on 115vac input. I expect to go to 240vac input
At 40vac input the output spark is over 6"


To obtain the feedback I run one of the primary leads through a toroid core. The feedback winding is one turn on the core.

Problem: The toroid core get VERY hot running at 40vac input. Too hot to touch. Is there a better way to develop the feedback????

I would appreciate any suggestions.
Skip