DRSSTC Primary Circuit Feedback Control

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>

Hi All,

I was looking at DRSSTC stuff today and I became worried that using the 
secondary base current for feedback control may place unneeded stress and 
the IGBTs...  So I am thinking of using the primary LC loop current instead 
to get "`exact" zero current crossing switching with very good timing.

I wrote up an explanation of the idea here:

http://hot-streamer.com/TeslaCoils/MyCoils/drsstc/DRSSTC-PriFeed.pdf

With zero current crossing switching, the stress and dissipation on the 
IGBTs should be far less and using cheap TO-247 style IGBTs (IRG4PF50WD - 
$8) should be very practical.

Cheers,

	Terry