In this design of a Tesla coil the creator talks about which IGBT he used and said he uses the FGA60n65 because he can run it at around 300a but I don't see how that is possible since the primary capacitor(CPRI) is 68nf and the primary coil is around 3 turns of wire so a fairly low inductance. The resonate frequency of the Tesla coil is approximately 300khz so using the reactance formula for a capacitor(I am ignoring the inductance because of its low value will not have much of a affect on the reactance) I find a reactance of around 7.8ohm. The max voltage of the system is 170 volts(Mains 120v rectified) and is passed through a half bridge so the voltage the primary will see is about 85volts so the max current can only be 10.9amps. Is it possible for a system like this to ever reach a peak of 300a if so how?

The creator talk about the design at this webpage
http://onetesla.com/tutorials/drsstc-bridge-design

 

The max voltage of the system is 170 volts(Mains 120v rectified) and is passed through a half bridge so the voltage the primary will see is about 85volts so the max current can only be 10.9amps. Is it possible for a system like this to ever reach a peak of 300a if so how?

Why do you think a half bridge cuts the input voltage in half? Half bridge only means it is one half of a H-bridge.

You never design anything using a expected voltage or current in electronics. Not if you want your item to live.

 

First of all thank you for not answering my actual question of whether it possible to draw a 300a peak from this circuit. Second of all please educated yourself on electronics before you comment.

Check out this video of Great Scott! Explaining and his Tesla coil design at 0:40 in

So either him and his 1.1m subscribers are wrong or you are, now which sounds more plausible

Also what does that mean "You never design anything using a expected voltage or current in electronics." the schematic up above is for a commercial product(That actual works) that I didn't design I just wanted to know if the creator claims where possible

 

and said he uses the FGA60n65 because he can run it at around 300a

The Absolute Maximum Pulsed collector current rating for that IGBT is 180A. Draw your own conclusions.

 

Some few years ago I was using those same IGBT's in a high power inverter design, and when operating at above 30kHz they would self destruct due to slow turn off characteristics, meaning that sometimes both would try to conduct at the same time. I overcame the problem by driving them with an SG3525a that provided a dead band period to ensure one was fully off before the other was turned on.
I have not studied your application in depth, i just saw the part no. and remembered the problem I encountered, so hope this may be of some use.
The device has probably been superseded with something better for your application by now, check the ON semiconductor website for more info.

 

The Absolute Maximum Pulsed collector current rating for that IGBT is 180A. Draw your own conclusions.

Thank you for your comment, I really didn’t notice that

 

First of all thank you for not answering my actual question of whether it possible to draw a 300a peak from this circuit. Second of all please educated yourself on electronics before you comment.

First of all, if you know the answers why come here to ask questions?

Second, actually learn something instead of looking at Youtube. Not everything there is the truth, though you won't believe that.

Third, having 1.1 million subscribers, and I bet your one of them, that think like you and know what you think you know is not a good estimate of worth.

Fourth, not understanding what I said in my first post, doesn't give you the right or permission to criticize a well known and understood law of electronics.