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Messages - Hydron

Pages: [1] 2 3 ... 12
1
Dual Resonant Solid State Tesla coils / Re: Next Gen DRSSTC
« on: June 16, 2019, 04:51:26 PM »
Thanks for the answer, I'll have more of a dig myself in the code. I look forward to the new features, and any footage from the show!

2
Dual Resonant Solid State Tesla coils / Re: Next Gen DRSSTC
« on: June 16, 2019, 03:18:25 PM »
Just a quick question for Netzpfuscher - is the behaviour of the lead_time value changed at all between versions of the UD3 code? I've had a go with a newer version and it doesn't seem to have any effect on the timing of the IGBT switching, whereas previously (at least a year ago!) it seemed to work as intended. I'll have a dig through the code to properly understand how it works, but I thought I'd just quickly ask incase there is an easy answer.

On another note, I have gotten my CY8CKIT-059 dev board up and running (other than the bootloader mode) with an ESP32 for wireless control - seems to work nicely! For those looking to do the same, note that I did need to change things a bit to run the PSoC UART TX on a SIO pin so that I could lower the high output level (the ESP32 isn't 5V tolerant). I used a different board to the Olimex ESP32 as I only wanted Wifi mode and it was cheap on ebay - I will integrate a ESP32-WROOM module directly into my final design whenever I get to that point!

3
Dual Resonant Solid State Tesla coils / Re: A dynamical arc model v2
« on: June 16, 2019, 03:10:15 PM »
Very interesting, I'll certainly be having a play with it.

I'll also hopefully be in the position soon of gathering some more data to help fit the model - I actually got some more data from my big coil (along with some physical and electrical measurements) in January, but there were some issues with it:
- I didn't have time to get such a comprehensive data-set as before
- It being summer (in NZ) stopped me from troubleshooting much on the single night I had to setup and test - getting dark late means a narrow window to make noise before it's unreasonable to neighbours trying to sleep
- I also had breakout from multiple points so not all arc current was captured - this is the main reason why I haven't done much with it, as it probably invalidates most of the measurements.
- I did however get some primary/secondary-base coil measurements to go along with the topload ones, all synced up with a fibre optic trigger.

I plan to have another go with both the original big coil and a small QCW coil that's been (very) slowly worked on here in the UK - I have _just_ got enough room in the latter to put a scope in a special toroid and it can probably also run low power in non-QCW mode. No guarantees as to when though sorry! (I know I have promised this before, and unfortunately been unable to do it in the short times I've had on holiday/vacation back in NZ)

4
Capacitor banks / Re: Bought huge capacitors
« on: June 12, 2019, 01:52:33 PM »
My 2c:
- very nice score!
- take those safety warnings seriously
- play around with mechanical switching, triggered spark gaps etc. This sort of energy is probably beyond normal SCR territory anyway!

5
Dual Resonant Solid State Tesla coils / Re: Next Gen DRSSTC
« on: May 25, 2019, 03:40:00 PM »
Just watched the videos - nice work!

Unfortunately haven't had time to do much work on my coil(s) recently, but when I do I'll have a play with all the new features you've added.

6
If you're wondering if it's worth even bothering to try and get one going, you could check how much RAM it has by looking up the part number on the chips you see on the back (if it's a tiny amount then makes them less interesting and harder to get anything running).

7
In the services of simplicity, I'd suggest trying something one of the following options:
- a single resistor in the region of 3-5 ohms (corresponding to the datasheet test spec resistance)
- a resistor as above, with an additional combination of another resistor for slowing turn-on (thus increasing effective dead-time) with a parallel diode for fast turn-off
If you're driving the gates with more than 15V then I'd lean towards 5+ ohms rather than 3.

In both cases scope the Vce and Vge waveforms - if there is Vge oscillation or excessive Vce turn-off spikes then increase the resistance. These IGBTs are pretty darn fast with low Qg, so I doubt that you're going to run into too-slow switching unless you use really large gate resistors.

8
Spark gap Tesla coils / Re: Where to buy Tesla coil capacitors?
« on: May 08, 2019, 11:55:00 AM »
If you can't tell what dielectric it is using, don't buy! Anything that isn't polypropylene is unlikely to be worth using.

Unfortunately I can't help much picking spark-gap coil capacitors, only had experience with caps for DRSSTCs (which have more options available due to lower peak currents).

9
Spark gap Tesla coils / Re: Would this be about right or not.
« on: April 06, 2019, 11:13:57 PM »
I wouldn't worry too much about it as long as it's in a sensible range, which ~1000 turns sounds it is.

10
Dual Resonant Solid State Tesla coils / Re: DRSSTC Driver Logic
« on: April 05, 2019, 12:23:16 AM »
To expand a little on pin swapping - in general the psoc is very flexible as to where pins go, but you may find that some arrangements (especially of analogue pins) fail due to internal routing constraints. I'd suggest trying to build your design in the Creator tool before making any permanent decisions as to pin placement.

11
I'd personally ground (by not modifying) the supply in the middle of the chain - that way each end is only half the voltage with respect to earth. This would not work if you had to put a non-differential scope probe on the IH though.

12
Beginners / Re: Need help identifying a component!
« on: March 31, 2019, 12:55:07 PM »
I agree that it's probably an ESD protection device - these tend to blow up if you manage to short a power rail to data pins. You may be able to confirm with a bit of detective work using the device marking and package type but it can be a major pain with those SMD marking codes.

I would remove it and test whether the device still works without it - it could have failed short and is stopping the USB port from operating. There is a chance that it still will, however it is also likely that the USB port on the microcontroller is dead (it's sometimes possible to blow up some pins without destroying the whole device).

13
Running direct from mains is extremely unsafe for something like an induction heater where you may contact the work coil by mistake.

There have been plenty of other suggestions that are much safer, go for one of those!

14
Solid state Tesla coils / Re: Chinese MOSFETS/IGBTS
« on: March 23, 2019, 12:11:10 AM »
I have had some luck with Aliexpress IGBTs here:
https://highvoltageforum.net/index.php?topic=193.0

Note that I did quite a bit of testing and checking before ordering more than one batch - I'm sure there are lots of nasty surprises out there!

You may also be able to apply some of the techniques I used in that post to your FGA60N65SMD, including the die size check - the die-only datasheet can be found here: https://shop.micross.com/pdf/fairchild/igbt/FGA60N65SM_IGBT_DIE.pdf

15
Unfortunately that's not really a viable way to build such a supply. Firstly those voltage converter units are normally autotransformers, with no isolation from mains input - you have to treat it just like you would mains (regardless of voltage) so very unsafe for a job like this. Secondly any linear regulator on the output would have to be very large to deal with the current.

As for the availability of server power supplies, they do sometimes come up cheaply when an older server is scrapped and sold off in bits. As you said though, shipping can hurt. If you can't find something else suitable then a few large lead acid batteries in series could be a candidate at least for use in testing.

16
Beginners / Re: Keep or throw away ?
« on: March 19, 2019, 08:14:33 PM »
Most likely not even usable for an amplifier - they will not have very good SOA for linear operation. I vote for scrap - that's what I did with my pile of large power BJTs.

17
Dual Resonant Solid State Tesla coils / Re: Strange gdt waveforms
« on: March 18, 2019, 02:27:35 PM »
I personally don't have an issue with it, especially in this context - I certainly understand the emotion of getting a long and tricky project going!. If anyone feels differently though then please feel free to get in touch with Mads about it.

As for the coil - looks like it's working quite well if you're getting that sort of performance 8)

18
You are right - I should have specified "and add a bit more film capacitor decoupling for the high frequencies".

I was thinking along the lines of induction cookers etc - they get good power factor by deliberately not including a large smoothing capacitor - high frequency currents are supported by smaller film caps but the overall input voltage follows the mains supply, leading to reasonable power factor.

19
Wow, that's some serious arcs coming from a relatively modest transformer! Definitely beats what I managed with 4 microwave transformers in series.

Have you considered removing the electrolytic smoothing cap? Might make it sound scarier to have the hum from the mains ripple.

20
Transformer (ferrite core) / Re: Piernas's Fast ZVS Mazzilli Driver
« on: March 12, 2019, 10:18:03 AM »
I'm not an expert on this stuff (I'm a physicist not an electronics engineer). With "dead-time" and "cross-conduction", you mean to avoid enabling both Mosfets at the same time?
That's exactly what it means - deadtime is the enforced period between the top switch turning off and the bottom turning on (or vice versa), while cross-conduction is what happens when both end up on at the same time, shorting out the supply (generally a bad thing :P)

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