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Messages - Mads Barnkob

Pages: [1] 2 3 ... 71
1
Finally! Guys i recommend you to buy the display from mouser or some other local store, i waited for almost 3 weeks for it to arrive, but it's finally here. It works like a charm. I need to find some nice enclosure for it. Thank you Max for sharing the project with us! :)




Did you make a output board yourself? Where you have the two optical emitters sitting.

2
Solid State Tesla Coils (SSTC) / Re: Fun with wireless power
« on: August 05, 2020, 12:55:52 PM »
Hi LoD and welcome to HVF!

Will there be an updated paper on the wireless transmission, as the one you have on your page is from 2008? http://lod.org/misc/Leyh/Papers/NAPS2008Final.pdf

3
General Chat / Re: Does anyone know how this site works.
« on: August 04, 2020, 08:33:47 AM »
You can be in luck that pages are saved in the internet archive, the wayback machine, but that often does not include pictures or files: https://web.archive.org/web/20020827095114/http://hot-streamer.com:80/TeslaCoils/Misc/NSTStudy/NSTStudy.htm

4
Oh and the primaries are not center-tapped in these kinds of transformers right? Since it runs fine with just these two inputs (the red and blue one)

Congratulations on getting it to run! I have 2 x-ray transformers that still sit untested in my workshop :o

I have only seen x-ray transformers with single or split primary coils (driven by each their being either negative or positive), but not any center tapped.

The secondary winding is however center tapped, so you should be able to locate the center bridge and you can use that to measure the secondary output current with a correct size shunt resistor or maybe even a clamp on meter

6
No readings between those pins, I tested all combinations and those were the only two places I could get a reading including the grounded exterior of the transformer case.
Those resources are a very nice find. That video seems to be almost exactly the same type so that's lucky. No luck finding a manual though, I've tried but I couldn't come up with anything. I keep wanting to just hook it up and try but burning out the coils is the last thing I want so I'll just continue learning about how this all works internally. I contacted a US based supplier and they aggreed to take one apart for me and get the components out of the oil. The guy will send me pictures from all sides and will try to confirm a few things for me so when I get those I'll share them here.
What would you say is the minimum ammout of power a DC power supply should have to power the ZVS and in turn this transformer?

That is nice, often it is very hard to get information from the companies on single parts without a service agreement.

You could properly power this from 50-100W at a very low duty-cycle, will get you some high voltage at very low current. The transformer you have is a beast and it will easily eat 65-100 kW peak, so continuesly (5-10 minutes) it could properly run 10-20 kW without cooking the oil, see if you can find the temperature measurement points on the control boards.

7
Could you get a reading between X1002 and X1003? and what about between X1001 and X1004?

I really wish I had gotten some pictures of the inverter connections of that large system I found, but I got nothing.

I found this short video and it seems there is only two primary wires going into the terminal housing of the transformer
/>
You could be lucky to find a manual that can give you hints of the connections, somewhere among there, despite most of it is older stuff: http://www.frankshospitalworkshop.com/equipment/x-ray_service_manuals.html


8
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: IGBT Selection
« on: July 29, 2020, 08:32:00 AM »
I am glad you found the guides useful :)

Depending on the price on these IXYS IGBTs, I would recommend getting smaller used bricks like SKM75/100/200 as they will most likely outperform these at the same price and be moire suitable for your 150 kHz coil. SOT-227B / miniBLOCK have disappointed me on their Icm capabilities compared to bricks or the good old 40N60 miniBLOCKS. Looking at its SOA rating (which is square), it is limited to 160A Icm for Ice < Ices, seems like a pretty steep derating, but since you use 300+VDC you can properly use the Icm 340A rating without worry. 

It is a relatively high voltage rated IGBT compared to your planned DC bus, aim for 2/3 of the voltage rating for enough head room, but also so that you do not suffer in current capability, as that tends to be lower on high voltage parts.

I am not too happy about there is no Vce(sat) graph to extrapolate on, as I do not believe the 2.7V for when overdriven, 4V is more likely to be normal.

I would look at 600V parts with higher current and pulse current ratings, as the pulse current ratings are a weak point of the miniBLOCK package that is just a beefed up TO-247 with a larger heat sink, but properly the same amount of silicon inside.

9
Good results from a coil running on bottle capacitors.

Your NST will for sure out perform that MOTs, if you upgrade your resonant capacitors to MKP film type. I think the lossy bottle capacitors simply works better at high current/low voltage, compared to what you have with the higher voltage/lower current of the NST.

Try to use some kind of direct light on the coil itself when recording sparks at night, as long as the background remains dark you will get much better video of both coil and sparks.

10
Looking forward to get this put together :) I must say that the Omni-mode is what I have dreamt about for years, I am really looking forward to use that feature (and not so much that I now have to build 6 identical coils)

I have just ordered all the parts I needed from digikey, since they are the only seller of the locking screw head opto parts with a good enough price to justify the import tax.

Here is the digikey order numbers if anyone else needs them

Dev board:
296-37267-ND‎
‎EK-TM4C1294XL‎
LAUNCHPAD TM4C129X EVAL BRD

Display:
‎1597-104990606-ND‎
‎104990606‎
NEXTION ENHANCED NX8048P070-011R

Optic transmitter:
‎FB162-ND‎
‎IF-E96E‎
LED FIBER OPTIC 645NM RED

Optic receiver:
FB124-ND‎
‎IF-D95OC‎
DETECTOR PHOTOLOGIC 5 TTL

11
The contents of the xray transformer tank is rather basic. It is a split step-up transformer with high voltage rectifiers and a voltage multiplier output stage.

The drive frequency is from the inverter and its driver circuits. The output of such a inverter is a pulsed DC square wave of some frequency that will result in a AC sine wave in the LC circuit of the capacitor in series with the primary coil.

You should be able to drive this with a ZVS driver, you could always add something in series with the main supply to limit the current, like a heating element or bulb. Something like a simple TL494 driver could also be a good way to experiment with low on-time and duty-cycle: http://kaizerpowerelectronics.dk/high-voltage/tl494-flyback-driver/

Getting the full potential out of this transformer will however require a large inverter with a serious DC bus to deliver pulses of 65 kW, considering you most likely only have 3x400VAC at 16A available.

A multimeter is great to check things, but to troubleshoot driver and inverter for a project like this (safely) you need a oscilloscope, current transformer and differential probe.

12
I tried to log onto 4hv but couldnt happen, I tried change pass word arghh got a new connection so old email has gone,
anyway Im here , Paris form NZ

see familiar names on here

Welcome to HVF!

You will see that many users known from 4hv is also here on HVF, the high voltage community is not bigger than that :)

13
You have every reason to be proud!

Sharing such a completely documented project with all software available is perfect example of the sharing culture in this niche of electronics.

If you are in need of beta testers to break the build, I will do all in my power to make your software behave badly, unintentional and possible crash :)


14
The series capacitor is outside of the tank, it is part of the inverter. You can see them sit in series with the primary output leads from the two IGBT full bridges in this setup: http://kaizerpowerelectronics.dk/tools/file-archive/?drawer=images*junk_yard_stuff*2015_12_23_-_xray_philips_optimus_65

This x-ray transformer is designed for 65 kW input power, 1 kW can still do damage if you connect it wrong, I still think you have a very similar transformer to the one I found there, where it used two full-bridge inverters.

15
From what I have observed in the xray inverters I have taken apart, they have a large 3-5uF capacitor in series with the primary winding, effectively acting as a DC blocking capacitor as its not driven at the LC resonant frequency and that is how the output voltage is controlled, by changing the drive frequency and the current by the on-time or pulse train lengths.

I would guess that 50 kHz is in the high end of what these are designed for, but that is merely a guess.

Maybe there is some information of value to you from this Steve Ward project: http://stevehv.4hv.org/ccps1.htm


16
Hi Niels and welcome to HVF!

From the look of it, it is a modern ferrite core transformer, seems newer than any I have found.

It is about as big as one that I found in a 70 kW system that had two SKM400 IGBT brick inverters, it was either running them interleaved or just one for low power and two for high power, I am not sure.

What DC resistance measurements do you get between X1001, 1002, 1003, 1004?

It could be two primary coils as some of the transformers are divided in a positive and negative part and the mid-point is grounded. The mid-point would in that case be a bridge through which you measure the output current, as it is at ground potential there is no problems with measuring it with a simple shunt resistor.

The voltage feedback interfaces are more modern than what I found, but you properly just have outputs for negative and positive voltage, temperature and pressure in the tank.

17
This is 9! 12V/7A server fans built into a fan cluster with handles! It is time to wreck some havoc and play with fire and smoke!

/>
Deciding on what looks best or gives the best airflow, but eventually went with the arrangement that gave the easiest soldering and routing job for the wires at the back.



Modified all fans with new wires and removed all excessive plastic parts, grills and connectors. Maximum air flow please!



I did not realize just how much fire was sucked through the fans until after I saw the photage. As seen in the pictures on the forum link there was some bad damage to the fan blade and wiring. It actually short circuited the DC rails from the fence melting through the insulation. It is also very good at cleaning the work shop floor.



The teardown there came from: *Dell PowerEdge M1000E Blade Server Teardown*
I came by a discarded full size Dell PowerEdge M1000E server rack. Full SAN, 2 large blade servers, 4 or 6 backbone switches, all power supplies and fans. This is a system that is about 8-10 years old and had a new price of around 1000000 DKR (166666 $US).
It was all unloaded in a big mess into a container and I only had time/space to take a blade server, all power supplies and fans with me. Hard disks all go to destruction and backbone switches and the M1000E cabinet itself is too big and clumsy to have any real value in the work shop.

Discussion of the teardown: https://highvoltageforum.net/index.php?topic=1151.0

18
Beginners / Re: Tesla Coil Topologies: Which to Choose?
« on: July 24, 2020, 09:25:46 PM »
Hi and welcome to HVF! It is indeed a lovely place we have here :)

Which direction of engineering did you study/do you work in?

It took me a long while to jump from SSTC to DRSSTC, but I really should just have tried earlier than I did. It is not as complex, if you look away from understanding how the universal drivers work internally and only focus on understanding what dual resonance means and how it works in a Tesla coil. I tried to put some words on that here: http://kaizerpowerelectronics.dk/tesla-coils/drsstc-design-guide/drsstc-faq-frequently-asked-questions/

If you do not have a oscilloscope already, get a cheap sub 100MHz DSO (Rigol, Owon, Awtek etc) or even good old analog 2ch 20MHz can be used. But it is mandatory to find errors in these inverters and drivers. Do not get tempted to buy the cheap DSO138 handhelds and such on ebay, wish, aliexpress, they are close to useless for anything above 20-50 kHz.

I will any day recommend Steve Wards SSTC-5 or known as the MINI-SSTC as a beginners choice. He developed the driver over a course of 5 coils and it reached a perfect state of simplicity, robustness and spark output capabilities. If you want to control the output voltage, as much as it is possible. You can do so from on-times, BPS or input voltage. Even if you do not have a variac to control the input voltage, a SSTC could be controlled at low power with a simple SCR based light dimmer.

Steve Wards SSTC5: http://stevehv.4hv.org/SSTC5.htm
My version of his SSTC5: http://kaizerpowerelectronics.dk/tesla-coils/kaizer-sstc-i/ + http://kaizerpowerelectronics.dk/tesla-coils/kaizer-sstc-ii/ + http://kaizerpowerelectronics.dk/tesla-coils/kaizer-sstc-iii/

Gao / Loneocean have also written some great articles on his SSTC builds: http://loneoceans.com/labs/sstc2/

I put some SSTC specific topics into this guide: http://kaizerpowerelectronics.dk/tesla-coils/sstc-design-guide/ and many of the topics in the DRSSTC guide goes for the SSTC as well: http://kaizerpowerelectronics.dk/tesla-coils/drsstc-design-guide/

I am looking forward to see your project


19
High Speed Filming / Re: FPS1000HD unboxing and first impression
« on: July 20, 2020, 02:16:03 PM »
Hi

Does anyone have a copy of the GUI used to control the camera, if so can I please get a copy of it!

Thanks
Nadun

Hi Nadun and welcome to HVF

What camera do you have? What firmware version does it have? (if its possible to see) and do you have any of the mentioned problems with it, in the other threads?

20
General Chat / Re: Comet NEOWISE
« on: July 18, 2020, 03:02:49 PM »
The forum uses youtube link conversion to embedding, there is no way around that as is. You can however write a text, select it and add URL and put the youtube video link into the ""

Code: [Select]
Test: [url=https://www.youtube.com/watch?v=zJCQI8uaFv8]youtube video[/url]
Test: youtube video

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