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Messages - Mads Barnkob

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1021
Solid State Tesla Coils (SSTC) / Re: Wifi SSTC attempt 1...
« on: August 06, 2017, 07:51:10 PM »
You are making some fast progress, you are moving way faster than I can manage these days :) You know, first there is 2 hours spend to clean the work desk before the latest projects gets into the daylight again!

Neat primary support and thanks for sharing the files, is it stiff enough to not need any cross beams between the supports? When using zip ties to hold the copper tube in place, be sure not to run the primary coil hot, the zip ties will loosen up and in worst case you have a shorted primary coil and exploding bridge.


1022
Electronic Circuits / Re: Royer induction heater
« on: August 06, 2017, 08:17:41 AM »
Thank you for sharing all the oscilloscope measurements, it all looks very clean, stiff and stable. I might just be wrong or my own Royer was much worse, but I seem to recall that the gate waveform was not as nice as yours.

Have you tried heating a large diameter water pipe? Just to try something with a larger diameter to get a better coupling to the work coil. I think that bolt is simply too small to be effectively heated in such a big coil.

1023
Taking serious offers on this huge lot. New price for all items is around 570$.

All new items, unused and maybe 20% of it have been opened. Bought in 2016.

Find list and pictures here: http://kaizerpowerelectronics.dk/tools/file-archive/?drawer=images*for_sale*2017_08_05_-_arduino_lot

world wide shipping is 15£

SOLD

1024
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: Tardief's DRSSTC
« on: August 04, 2017, 02:45:18 PM »
I have only been using 564VDC from 3x400VAC, but I would switch to up to 800VDC any day if I could :) Most of the components are already rated for the higher voltage, its simply the problem of making/finding a 3 phase PFC power supply for that voltage range.

We made a large diameter nylon bolt with split pin, this mounts through a hole in the primary base plate, the split is inserted on the under side. It is loose and attached to a string, so that the bolt can disappear into the secondary coil in order for it so stand flat on ground when not mounted on the base plate.

Takes two people to mount the coil on the plate, but that has more to do with the weight of the secondary coil itself, it is very close to 40-50 kg.

1025
Solid State Tesla Coils (SSTC) / Re: Wifi SSTC attempt 1...
« on: August 04, 2017, 01:37:01 PM »
Good progress, if you want to put more work into the GDT waveform or it begins to act worse when loaded, you can use Richie Burnett's excellent guide on GDT waveforms, causes and fixes. http://www.richieburnett.co.uk/temp/gdt/gdt2.html

1026
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: Tardief's DRSSTC
« on: August 02, 2017, 08:47:56 PM »
I made all my coils to be supplied by AC, most of the time from a variac.

I got two different ways of measuring the input current / voltage, I got my large variac with a 3 phase voltage/current meter in ( http://kaizerpowerelectronics.dk/power-supplies/3-phase-13a-variac/ ) and a Merlin Gerin PM700 3 phase power analyzer instrument ( http://kaizerpowerelectronics.dk/power-supplies/merlin-gerin-pm700-power-meter/ ) that I can use for power factor readout, so I know the DC voltage / current from calculations, so I never ran any wires back for instruments. There is only the AC cable and fibre optic cable.

I usually just used the same cores as I used for the GDT, they do however only need to be physically big if its needed because of the conductor you have to get through it or insulation to the inverter voltage is a problem. You properly already know the datastream GDT guide? http://thedatastream.4hv.org/gdt_index.htm

1027
The first two packages have been processed and delivered back to the server, somewhat slower than my PC, about 18-20 times, so not bad at all :)

Points total: 199
Moving average: 14.40

CPU type: ARM
Number of processors: 1
Operating System: Linux 4.1.19+
BOINC version: 7.4.23
Memory: 0.42 GB
Swap space: 0 GB
Total disk space: 7.12 GB
Free Disk Space: 4.54 GB
Measured floating point speed: 0.23 billion ops/sec
Measured integer speed: 0.99 billion ops/sec

1028
Solid State Tesla Coils (SSTC) / Re: Wifi SSTC attempt 1...
« on: August 02, 2017, 07:49:41 PM »
Very nice, the "27A @ +42 VDC" is perfect for a Royer, its around 1200 Watt and is properly also in that ball park that a standard Royer fed with 40VDC will be around, the higher voltage you feed it, the more current it will also try to consume, even pulling down the supply voltage from the heavy load.

So if you load this too heavily, it will properly go into some kind of over-current/load mode and shut down.

1029
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: Tardief's DRSSTC
« on: August 02, 2017, 06:22:57 PM »
Winding/varnishing rig and pipe looks good!

I would not advise anyone, except if you are in a hurry and money is not a issue, to buy a EVR product, which is 99% based on the Steve Ward universal drivers which was further developed by Finn Hammer and Gao Guang, among others.

Gao got both MIDI controller and UD2.7 for sale on his website, as kits, so prices are also completely different.

UD2.7: http://loneoceans.com/labs/sales/ud27/
Midi: http://loneoceans.com/labs/sales/midi2/

there is also the onetesla midi interrupter: http://onetesla.com/products/kits/interrupters-all.html

I got both Gao's and onetesla, except I did not put Gao together yet :o

There are also other alternatives around on other forums/websites, heck, if you want you can have the ExpressPCB files to etch a single sided(all DIP) UD2.1 that I did a layout for. Still has some issues like components doesn't fit completely and needs a little "compacting" or "strecting" :)

1030
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: Tardief's DRSSTC
« on: August 01, 2017, 10:08:21 AM »
I only see them at 50$/piece, so that is 200$ for a full-bridge, that is about what I payed for the used bricks I have.

They do write that they are new, it is from Malaysia, company called IGBT wholesale, feedback on ebay looks fine... its hard to say, but they are much cheaper than competition.

Import taxes might also add to the total price.

1031
Solid State Tesla Coils (SSTC) / Re: My 160 (?)mm sstc
« on: July 30, 2017, 05:07:22 PM »
Looks good oneKone :)

Looks great, just winding by hand it looks like?

Most of the time its actually quite easy to control just by hand, and takes much less time than making a rig, a rig is however needed for the drying varnish, atleast for a good even result. It was only my large DRSSTC3 where we built a rig for winding.

1032
Solid State Tesla Coils (SSTC) / Re: Wifi SSTC attempt 1...
« on: July 29, 2017, 11:41:42 AM »
Also looking for advice on capacitors.  If this idea doesn't work I want to reuse these in a MMC. They are the 'MKPH' capacitors found in many induction cookers. The specs seem like they would be ok, but the dirt cheap price of them makes me have second thoughts. This link here was the only specs I could find.

http://www.cgegd.com/en/displayproduct.html?proID=1223865

I would not trust them to be anything superior when there is no datasheet, but I think you can assume they will perform as MKP X2 capacitors.

I have some different capacitors in my MMC calculator here: http://kaizerpowerelectronics.dk/calculators/mmc-calculator/ and also a list of some more capacitors here: http://kaizerpowerelectronics.dk/theory/good-mmc-capacitors/

1033
Solid State Tesla Coils (SSTC) / Re: My 160 (?)mm sstc
« on: July 28, 2017, 12:05:41 AM »
I am also considering running my primary on the inside. Biggest drawback I see is the difficulty tuning the primary.

A SSTC does not have a resonant primary circuit, so there is no need for tapping points on the primary coil. So that is not a problem.

1034
Solid State Tesla Coils (SSTC) / Re: Wifi SSTC attempt 1...
« on: July 28, 2017, 12:04:25 AM »
I am not completely sure how you are going to put all these features together, but here are some pit falls you should investigate in your experiments

The Royer oscillator is a self-resonating circuit, you do not have any control over it as such, its really one of those crash-and-burn circuits when pushed either too little or too hard.

A fixed frequency primary circuit is not a great way to produce sparks, as sparks load the secondary LC circuit, the resonant frequency of the secondary changes,

I assume you are talking about 120VAC mains, but even here you will have around 540V across the switch, add switching spikes to that and you are running at the edge of failure. Offline ZVS/Royer oscillators is something many people have tried to make and many has also failed. Larger gate charges and slower high voltage switches simply makes it hard to make a offline version of it.

What were you going to use the microcontroller and wifi for?

1035
Electronic Circuits / Re: Royer induction heater
« on: July 27, 2017, 11:53:26 PM »
Really great results when it finally got all the power it could get at a higher voltage, the losses are really massive, 33% is high, maybe if you tried lower gate resistors to turn on faster, but only if your gate voltage allows it, or you could also add a separate gate voltage supply so that its independent of the supply for LC circuit. How is the MMC holding up temperature wise?

You are right that tap water will perform some electrolysis, but if this is just hobby work and not something that has to run 24/7, do not worry about it. Distilled water for batteries/ironing clothes can be bought in almost any super market in Denmark, don't you have the same options?

Your current transformer looks like its 1:20 ratio, so if you have 100A in the LC circuit, that would give you 5A * 0.5 Ohm = 2.5Vpeak sine wave on you scope, the current transformer will be floating, as you just measure the voltage across the resistor, it does not have any polarity important to ground. Just remember that a current transformer must never be used open loop, its so easy to forget a CT in a test setup, it will destroy itself while attempting to reach infinity Volt.

1036
Solid State Tesla Coils (SSTC) / Re: My 160 (?)mm sstc
« on: July 27, 2017, 01:51:32 PM »
It will be a fairly large SSTC and you should at-least use a full-bridge and as high DC bus voltage as you can, in order to get long sparks.

SSTCs does not scale well in matter of spark length output when building them bigger, unless you make a inverter that can work into a few turns / low impedance primary coil.

If you are feeling adventurous, you could try to make a internal primary coil, I always wanted to try that, but never did :o

I was thinking with the DS bus supply voltage to make a simple inverter capable of 500v but would be current limited, and just run low bps.

I'm interested in a internal primary coil now! I can't seem to find any examples though.

I think there is some E-field issues which could result in flash overs between secondary and primary, but in a SSTC where the peak current/voltage is lower, it might not be an issue. The interesting part of a internal is that you can have a lower impedance with the same turns, compared to it being on the outside.

1037
Solid State Tesla Coils (SSTC) / Re: Single Transistor SSTC
« on: July 27, 2017, 08:11:22 AM »
Great and simple project, many people really like the 12VDC supplied coils as they are not comfortable with mains or does not have it available, good job :)

Did you run into any problems with using the CD40106 as enable, by turning it on/off to the interrupter signal?

I could imagine that it works okay because of the high resonant frequency of the coil (what is it at?), but if the method was used on something like 50 kHz there would be missing or half signals?

If we take a look at the datasheet for the CD40106 there is curves for Transition Time (ns) and Trigger Threshold Voltage (V) that both show much changed behaviour at different supply voltages, and as the interrupter has to also charge/discharge the 100nF decoupling capacitor, the rising edge of the supply could disturb things?

I am purely guessing on a theoretical level here, so just wanted to hear if you had any troubles there?

1038
Solid State Tesla Coils (SSTC) / Re: My 160 (?)mm sstc
« on: July 27, 2017, 08:00:35 AM »
It will be a fairly large SSTC and you should at-least use a full-bridge and as high DC bus voltage as you can, in order to get long sparks.

SSTCs does not scale well in matter of spark length output when building them bigger, unless you make a inverter that can work into a few turns / low impedance primary coil.

If you are feeling adventurous, you could try to make a internal primary coil, I always wanted to try that, but never did :o

1039
Thank you very much for the links, I was not expecting to be the first to take one of these cheap induction stoves apart and abuse it, but I really did not make much research on it either, just got carried away when I saw the price on it in the store :)

The application note has a good and simple introduction to the quasi-resonant drive, that is nice.

The circuit analysis on openschemes is properly not too far from how they implemented the same voltage tracking in the microcontroller on the IKEA one, I hope I can take a guess on these by scoping the inputs in regard to each other.

1040
I have had a Raspberry Pi lying around for a while without any designated purpose, so I came by a few forum posts about using them for BOINC / SETI@home computing.

This is how I got it running.

1) First update your Raspberry Pi
Code: [Select]
sudo apt-get update
sudo apt-get upgrade

2) Install BOINC
Code: [Select]
sudo apt-get install boinc
3) Find you BOINC account key at https://setiathome.berkeley.edu/weak_auth.php

4) Attach a project in the BOINC client by (replace you_account_key with the key found in the first field at the above URL)
Code: [Select]
boinccmd --project_attach http://setiathome.berkeley.edu your_account_key
5) Check if BOINC client retrieve any packages and have started working on it
Code: [Select]
boinccmd --get_tasks


6) See in the above picture that the downloaded package will take 68 hours to compute :D

7) It is now also to be seen at the computer list on the statistics webpage: https://setiathome.berkeley.edu/hosts_user.php?userid=10004858


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