Author Topic: Next Gen DRSSTC  (Read 8514 times)

Offline Mads Barnkob

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Re: Next Gen DRSSTC
« Reply #60 on: May 26, 2019, 08:49:19 PM »
Is it just the recording or is there some stuttering in the music playback?

Do you have more recordings from a little further away, the video does not fully represent how large the coil and sparks really are at those power levels! :)
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline Netzpfuscher

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Re: Next Gen DRSSTC
« Reply #61 on: May 27, 2019, 08:07:12 AM »
No I have no other videos, the cage is too small for my cellphone. For a bigger image I need a wide angle lens.

Yes you are right, there is stuttering. I investigate this, there are two options. The javascript midiplayer cause this, or there is crap on the serial line in the coil. I added a counter for broken packets in the software. The protocol works like this:

-packet with a sequence number is send to coil
-coil sends a ACK with the sequence number
-the next packet is send
-packet gets corrupted
-no ACK is send
-after 50ms the packet is retransmitted

But 50ms is way to slow for MIDI, you can hear this. I need to play with the parametes perhaps I reduce the retransmit time and introduce a NACK which causes the transmitter to resend the last packet instantaneous.

You don't hear this in the first video. This uses the SID-Synth which has a buffer with around 500ms in the driver.

And we need to change the serial line in the coil. There is a 1m shielded cable from the driver at the bottom to the front panel with the fiber transceiver. In the past we have seen much crap on this line. With the protocol this crap is not visible in the data but it adds jitter.
« Last Edit: May 27, 2019, 08:25:14 AM by Netzpfuscher »

Offline Hydron

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Re: Next Gen DRSSTC
« Reply #62 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!

Offline Netzpfuscher

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Re: Next Gen DRSSTC
« Reply #63 on: June 16, 2019, 03:39:15 PM »
No, I think I haven't touched it. But I cannot guarantee that there is no bug on other changes which can cause this. At the first sight everything looks ok. I haven't measured the leadtime for a while now, all of our coils have the same SKM400 bricks.

I have used a voltage divider on the TX pin for the ESP32.

Actually there is a new feature incoming, a alarm and event system. Which helps a lot to debug a coil.



At the end of the month there is a big event here in Germany "Extraschicht" where we have a high voltage show at a old power station. Besides a 4m SGTC we have the big UD3 DRSSTC. I hope everything works  :o

Offline Hydron

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Re: Next Gen DRSSTC
« Reply #64 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!

Offline Mads Barnkob

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Re: Next Gen DRSSTC
« Reply #65 on: June 17, 2019, 11:13:33 AM »
Good job on the continued development of the software, looks real good with a debugging system and as Hydron says, we look forward to video from the show, hopefully you can get on a distance this time to capture how big it really is :)
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline Netzpfuscher

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Re: Next Gen DRSSTC
« Reply #66 on: June 17, 2019, 09:01:29 PM »
I finished the alarm & event system. I added a value field that you can see at which temperate or voltage something happens. The sysfault is much finer, now you can clearly see which signal is bad and stops the coil.

alarms get  --> shows the last 50 events
alarms reset --> clears the event list
signals --> shows the signal states
kill reset --> clears the sysfault registers which are not self clearing

I merged everything in the master branch https://github.com/Netzpfuscher/UD3

@Hydron I cleaned the timing calculations but I can't see any fault. If you find something, feel free to make a pull request. By the way the lead_time resolution is in 15ns.


« Last Edit: June 17, 2019, 09:03:13 PM by Netzpfuscher »

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Re: Next Gen DRSSTC
« Reply #66 on: June 17, 2019, 09:01:29 PM »

 


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