Author Topic: (DR)SSTC II  (Read 256 times)

Offline Laci

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(DR)SSTC II
« on: November 17, 2018, 01:05:45 PM »
EDIT: Background material from original SSTC thread: https://highvoltageforum.net/index.php?topic=455.0

I did some basic double resonant tests at 50V.So far everythings seems to work.The OCD is doing it's job,I don't know if it activates at the right currents-should check it with the scope.It has a small problem though,since at the lowest potentiometer range,when the blue 7-segment display shows 0.00,it stops activating.



JavaTC shows an accurate result:the secondary has a bit too high resonance frequency,which should decrease at spark loading,but at 50V it performs better with two toroids,like here:
(An older picture)



The static load test was made,the water in a can heats up.I calculated a maximum of 6 half cycles to charge the MMC to about 1920V,where the peak current is around 200A.The MMC is weak yet,just two PHE450RD6220J capacitors in series.
And here are some noisy primary current waveforms through the OCD CT:







...and inverter output:







Is it rectified mains ready? :)


« Last Edit: November 17, 2018, 07:07:50 PM by Mads Barnkob »

Offline Mads Barnkob

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Re: (DR)SSTC II
« Reply #1 on: November 18, 2018, 07:10:16 AM »
Great that you have it working as a DRSSTC now, there is only one concern from me, your very high coupling from its SSTC time is way too much for a DRSSTC and you will see flash-over from primary to secondary and most likely ruin your secondary coil if you run that at full voltage.

Use the proposed 0.13-0.15 coupling from JavaTC, any experiments with higher coupling than that will have to take extraordinary care of insulation between the coils to prevent flashovers.

Having the primary tuned 10% below the secondary is properly even to maximum spark loading, so that is also why you see a performance increase from added topload, you pull the secondary coil closer to the primary resonance.

The switching spikes are perfectly normal for low voltage testing, it is due to the output capacitance Coess of the IGBT, the voltage spike caused by this capacitance is the same all over the input voltage range, so once you have full dc bus voltage across C-E the spikes will look much smaller as the waveform amplitude increases but the spikes voltage remains the same. The same goes for the curvy dipping "square" wave, it is a cause of low voltage testing.
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline Laci

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Re: (DR)SSTC II
« Reply #2 on: November 18, 2018, 12:24:04 PM »
Can I try the static load test on rectified mains and measure the inverter output with a 1:10 probe?

Offline Mads Barnkob

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Re: (DR)SSTC II
« Reply #3 on: November 18, 2018, 03:40:12 PM »
Can I try the static load test on rectified mains and measure the inverter output with a 1:10 probe?

There is some very important things to know about oscilloscopes and doing measurements on a inverter output without a differential probe. Watch this to avoid blowing up your scope.

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Offline Laci

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Re: (DR)SSTC II
« Reply #4 on: November 19, 2018, 09:24:54 PM »
What about the static load test?Since the first snow arrived today,I'd like to make tests inside,without the counterpoise. :)
Is there any RMS current formula for a DRSSTC,just to make sure that it will not blow any fuses?!

Offline Mads Barnkob

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Re: (DR)SSTC II
« Reply #5 on: November 20, 2018, 05:44:25 PM »
What about the static load test?Since the first snow arrived today,I'd like to make tests inside,without the counterpoise. :)
Is there any RMS current formula for a DRSSTC,just to make sure that it will not blow any fuses?!

Try the RMS current calculation I did here, just with some more "real" numbers, as this example is used to design the DC bus capacitors needed, its set with very high figures: http://kaizerpowerelectronics.dk/tesla-coils/drsstc-design-guide/dc-bus-capacitor/
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Offline Laci

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Re: (DR)SSTC II
« Reply #6 on: November 20, 2018, 09:31:12 PM »
Thank you for the help!I couldn't calculate the RMS current as I wanted,however that's pretty useless since while it runs as SSTC,the duty cycle isn't constant.The only reason was to know if a simple 2A fuse can handle this load,because any higher current fuse will break slower,than the mains automatic fuse if something shorts and that would be a big shame on a presentation.So I just cross my fingers and beleive in the power of silicon! :D

I will countinue testing in dual resonant mode,but I don't want to ruin the current driver,since I have to bring it to many places these days.If this "season" ends well,I will definitely look around for some bricks/minibricks and newer drivers,like the UD2.X or UD3.I'm already digging into freewheeling and complicated stuff like that. :) Until then I'm going to return to the old coil(which also had a better 1:4 diameter to height ratio for dual resonant mode)with a IRG4PC50W full bridge.

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Re: (DR)SSTC II
« Reply #6 on: November 20, 2018, 09:31:12 PM »

 


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