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Registered Member #3960
Joined: Mon Jun 20 2011, 06:27AM
Location: Wuhan Hubei China
Posts: 33
Your QCW DRSSTC looks so beautifulï¼ I have a lot of problems.I'm building a QCW DRSSTC project.Hoping to get some help. How much the TC HBridge's bus voltage waveform slope ? It is a linear law? How to record the tank current waveform envelope?^^
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
I am building a hand held version of the qcw that is about the same size as your coil and I was wondering if you would be willing to post a picture of the semiconductor face of your tesla. I was thinking of making my bridge of 4 hgtg27n120bn X 4 for a total of 16 devices do you think that it is over kill? I am trying to gauge how much power it takes to produce large sparks like your gif pictures and how big can they get. Do you think that the length of the arcs are due to the large electrolytic capacitors (energy storage) or the wall power you are supplying? thanks
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
Wow, totally awesome .
You mention 300A somewhere, which sounds about right. My original QCW managed only 6 foot sparks (~182cm) with ~270A drive, but it seemed to be going too far out of tune and i didnt have nearly the bus capacitor that you have, so it just never pushed any futher despite longer pulses. I find that adding secondary C helps with the detuning and keeps the primary current significantly lower.
I also am impressed with the size of your setup. Good old aluminum heatsinks will do the trick if the rep rate is low enough . We mainly rely on the copper tab of the TO-247 for pulses in the 20mS range, so it really comes down to if your IGBT has a big enough chip or not. It sounds like you are finding out what the absolute max pulse capacity of these IGBTs are!
Registered Member #4762
Joined: Sun May 06 2012, 05:59PM
Location: Russia
Posts: 93
Semi-final setup. The doubling of electrolytics and adding a bigger topload increased the perfomance (230+) cm, but unfortunately there's no place for more capacitance inside the case.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
I think you hold the spark length to secondary height ratio record. Exhalent work, your coil is more of a work of art. Do you plan on releasing any schematics so we can better understand it?
Registered Member #2566
Joined: Wed Dec 23 2009, 05:52PM
Location:
Posts: 147
zrg wrote ...
The current limiter is set to 300A, which gives us ~60 kW of peak power through buck. It's amazing how much these small transistors can withstand However, in the end it banged with several kJ from lytics coming into my poor ears.
well,it would be interesting to estimate energy used to create 7' spark.
W=∫P(t)dt
assuming ~15ms ramp,and 60 kW peak power with linear rise of input power that would give:
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Junky QCW
However, in the end it banged with several kJ from lytics coming into my poor ears.