Author Topic: Advice for simple SSTC design  (Read 1021 times)

Offline shrad

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Advice for simple SSTC design
« on: March 18, 2021, 03:48:52 PM »
Hello there,

It has been some time since I did high voltage experimentation and I wanted to start over again...

I'm putting together a simple SSTC for fun and have designed a simple driver from a 4046 oscillator for variable frequency 50% duty cycle oscillator, CD4049 for phase splitter, and UCC27321 pair driving a capacitor coupled GDT for a simple half bridge

So far so good, the oscillator and driving part are working OK but I'm facing the traditional GDT issues with blowing UCC27321

I've gone the try and error route to have a GDT that will not fry everything but still have the lower UCC heating a bit, and a sawtooth ringing at the top of the mosfet gate signal...

Anyone would have pointers on the reason of this ringing which takes all the top waveform without damping over time? GDT core is unknown material but 10 turns of CAT5 cable goes 0.29mH (I also have others with nanohenries which seemed not ok to me)

Pictures attached :




Offline John123

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Re: Advice for simple SSTC design
« Reply #1 on: March 18, 2021, 04:05:28 PM »
I've had problems using enamelled copper wire before, its very easily to accidentally remove a part of the enamel insulation during winding causing a short (or partial one). Also are you 100% sure the breadboard is good? This is the kind of thing I often see when I try breadboarding such circuits only for it to be a bad connection on the breadboard.
« Last Edit: March 18, 2021, 04:12:42 PM by John123 »

Offline davekni

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Re: Advice for simple SSTC design
« Reply #2 on: March 18, 2021, 05:58:40 PM »
The sawtooth top indicates some parasitic oscillation in the driver circuit - likely the cause of driver chip overheating.  These plug-boards and associated jumper wires have too much parasitic inductance to use for high-current circuitry such as gate driver chips and half-bridge FETs.
David Knierim

Offline shrad

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Re: Advice for simple SSTC design
« Reply #3 on: March 18, 2021, 06:55:41 PM »
Ok thanks a lot, I'll ask those critters to move to a greener land  ;D

The issue doesn't come from the enamel wire, same issue was raising with cat5 cable

I'll post progress when I can, if the issue comes from the breadboard I might even get some first light to show

I didn't even think of this cause, silly me...

Offline davekni

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Re: Advice for simple SSTC design
« Reply #4 on: March 18, 2021, 07:37:54 PM »
The half-bridge itself has highest current, so low inductance there is most important.  You may want to consider overlapping parallel planes to minimize inductance, as in this example half-bridge layout I posted:
https://highvoltageforum.net/index.php?topic=1324.msg9795#msg9795
David Knierim

Offline shrad

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Re: Advice for simple SSTC design
« Reply #5 on: March 19, 2021, 09:39:49 AM »
Thanks Dave,

This is what a low inductance bridge looks in my mind (I'm used to discharge physics a bit)

Simply when you cobble something together on the desk you usually don't think to do it like that the first attempt

Here I'm working iteratively, I just put some mosfets I had planned to use for low voltage tests to compare with the 10nF caps I had put previously and noticed that driven capacitance was not at play there and my GDT was probably fine as the damping resistor value did not play a role either

I'll make two separate modules, and the bridge will be made on some spare double sided FR4... thanks for putting this back in my head :)

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Re: Advice for simple SSTC design
« Reply #5 on: March 19, 2021, 09:39:49 AM »

 


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