Author Topic: Question about ramped sstc  (Read 269 times)

Offline costas_p

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Question about ramped sstc
« on: September 02, 2021, 08:43:34 PM »
Hello HVF community,

I built a ramped sstc, using loneocean's  interrupter and full bridge of IRFP460

Specs are: ~410kHz resonant frequency
                Primary 10 turns for initial testing
                DC block cap is 1.38uF MKP
                CT 50:1 for feedback
                GDT/CT cores are N30 material previously tested on normal SSTCs (both working)

I power up the coil using 50v from a variac to see if everything is right, and gradually increase the voltage, however, increasing the voltage lowers the spark growth  :-\

Is there any possibility variac inroduces a phase lag/lead to the bridge , so that the interrupter get un-synchronized with the bridge?


Edit: halfway throught the video I increase variac voltage and the coils responds like I adjust the pulse width pot to lower - without doing so
« Last Edit: September 02, 2021, 08:45:30 PM by costas_p »
Papadakis Costas

Offline Uspring

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Re: Question about ramped sstc
« Reply #1 on: September 03, 2021, 06:40:00 PM »
The variac might change the phasing of your staccato controller, if it has a large leakage inductance. You will have to look at the voltages with a scope to determine this. Also possible is the coil going out of tune. A good indicator of this is the phase between primary and secondary current. The closer this is to 90 degrees, the larger the power transfer is between primary and secondary coil.

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Re: Question about ramped sstc
« Reply #1 on: September 03, 2021, 06:40:00 PM »

 


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