Recent Posts

Pages: [1] 2 3 ... 10
1
Dual Resonant Solid State Tesla coils / Verschrottix DRSSTC II
« Last post by verschrottix on Today at 12:16:32 AM »
Hi,
so i am currently building my new DRSSTC.

This DRSSTC should be very reliable because I am planning to do several experiments to further improve the design without risking blowing it up.

Here are some specs:


Primary circuit:
FZ800R12KF4 IGBTs [1200V 800A cont 1600A for 1ms]
5.6mF Buscapacitance
2GDTs for gate driving
U shaped primarycoil form (reason explained later)
333nF or 750nF primarycap out of custom made Snubbercaps
560V Busvoltage
2kA primarycurrent

Secondary circuit:
250x1300mm PP or PTFE Tube
250x1200mm Torus
0.6mm Grade 2 CuL
fres approx. 45kHz
Z sek around 50kΩ

As I mentioned before I'm planning to do some experiments with this coil:

First of all the primary will have a motor controlled tap point. The goal is that the coil will tune itself via measuring the phaseshift of the primary to secondarycurrent (in resonance the phaseshift should be 90 degrees). But for the first tests i will tune it by my own.
This tappoint is the reason why i chose this primarycoil form because the last few turns have the same diameter which is easier for a tappoint.

Also a powersupply for the Busvoltage is planned, I will write about that as soon as I am building it.
2
Dual Resonant Solid State Tesla coils / Re: Next Gen DRSSTC
« Last post by Hydron on February 18, 2018, 11:59:59 PM »
Steve - thanks for releasing this out there (and for all the previous UD drivers - most of us got our coils going with one of them!). If I can help with documenting how to use the UD3 without hand-holding I will (though it'll be a while before I understand most of the code myself - hardware is more my thing!).

As for the response plots - there is indeed an extra CT input, using the same circuit as the CTout net but with a 5R burden resistor. Once I get something up and running myself I'll be comparing the plots to what I get out of a FRA instrument (which also gives the primary, secondary and split-poles).

I'm personally also interested in the PFC possibilities/code, though I have a lot of work to do on my coil before I get to that part (and would also need to understand FreeRTOS more before I start adding tasks/code to Netzpfuscher's work). Will PM with my email address.
3
Dual Resonant Solid State Tesla coils / Re: Regarding the Ward QCWDRSSTC
« Last post by Steve Ward on February 18, 2018, 07:13:46 PM »
Just for reference, each transformer (there are 8 total) has a core cross section of 20x20mm.  The outer dimensions of the core are 80x80mm if i remember correctly.  So they really are quite modestly sized ferrites, and easily available even from places like Mouser/digikey if you know how to find them :P.  I would favor cores with the lowest losses, since this application is rather high frequency.

The primary wind of each transformer was 10 turns of litz wire (looks like ~14awg equivalent) which was salvaged (along with the cores) from inverter-based welding machines.  Your secondary turns will depend on the impedance of the primary you are driving.  With my 8 transformers, i had essentially 4 secondary turns, which are all in series so the total transformer ratio is 10:(4 * 8 ) or 10:32 (so 450V in gave 1440V driving my primary LC).  The resonance capacitor is on the output side of the transformer bank.  The machine works at ~350 to 300khz, which i think put the flux density in the ferrites at about half of saturation level.  When designing transformers there is a trade between copper loss and core loss.  More turns means less magnetizing force on the core for a given volt-second applied which reduces core loss, but increases copper loss.  My design is not optimized but was based on materials available... i could have fit a LOT more copper in there if i tried. 

Pic of transformer bank: https://www.flickr.com/photos/kickermagnet/15051691754/in/dateposted-public/
4
Dual Resonant Solid State Tesla coils / Re: Next Gen DRSSTC
« Last post by Steve Ward on February 18, 2018, 07:00:45 PM »
Just wanted to say how great it is to see Jens expand upon the UD3!  I'm at a point where im sure im not gonna pursue any for-profit business with my work with Tesla coils, so I'm totally fine with releasing design/code, so long as my name gets in there still :-).  The main reason UD3 isn't out there, easy to find and download files, is that it's quite an undertaking to build one and make it work and supporting others in that effort is quite time consuming, so i've been limiting its release to a few people that have contacted me.  Jens seems to be quite at home with embedded programming, so I hardly had to do more than send some files over and he took it from there.  I've had quite a time supporting other guys who were totally new to coding, but eventually everything worked out.

Wanted to mention that UD3, with its extra HVDC sensing inputs, DC current sensor input and the few unassigned digital outputs, is capable of controlling a PFC or buck stage in addition to its usual TC duties (and it can also do phase-shift bridge control).  I have code for both of these instances (the buck driver code is really hacky... but it works) so if someone is really wanting to take this on, i can send code.  Of course, it's not at all compatible with what Jens has done here!

The tuning plots are really slick... did you add an extra CT input to get the secondary response?  Im sorta confused about what the difference is between those 2 plots you show... since the Fres dropped and another peak showed up, my guess was that the first plot was primary only (secondary physically removed) and then second plot had the secondary in place, but it says 0.3A which to me means you have a CT on the secondary ground lead.


5
Dual Resonant Solid State Tesla coils / Re: Highway to DRSSTC
« Last post by Mads Barnkob on February 18, 2018, 03:08:02 PM »
I agree with you that there is some other problems, because these drivers should drive a MOSFET/IGBT fairly good on its own, maybe with some rounding on the rising edge, but still should be okay.

It can be a long and tiresome road to get out of the deep fault finding hole you are in, did you try to start all over from scratch with new components?

Try to only build small parts of the circuit first, power it up, check if all voltages are present as it should be, now build on the next stage, test again and so on until you have a working driver, that should help you with finding out in which stage the fault is.
6
General chatting / Re: I told it was not here :P (sorry)
« Last post by Mads Barnkob on February 18, 2018, 03:02:27 PM »
Great that you got help from our hosting then :)
7
Thanks for the nice video and good luck with moving all this stuff!
8
General chatting / I told it was not here :P (sorry)
« Last post by AndreiRS on February 17, 2018, 04:19:58 PM »
9
Spark gap Tesla coils / Re: Afraid or frying another winding
« Last post by AndreiRS on February 17, 2018, 02:56:44 PM »
Hi Dan. Thanks for your reply. I have that filter. I didn't explain it well, sorry. When I fried it, it was not connected to anything. There was no load, so it just created an arc inside.
10
Spark gap Tesla coils / Re: Afraid or frying another winding
« Last post by profdc9 on February 17, 2018, 04:02:13 AM »
You need to put a Terry filter between your transformer and the spark gap.   RF spikes are probably feeding back into your transformer and frying it.  I use MOTs and I had to do this to protect my doubling diode.

This is a good reference.

http://www.laushaus.com/tesla/protection.htm

Don't use the Chokes!!  You're better off using just simple RC snubbers and metal-oxide varistors (MOVs), as well as the safety gap.

Dan
Pages: [1] 2 3 ... 10

* Recent Topics and Posts

post Verschrottix DRSSTC II
[Dual Resonant Solid State Tesla coils]
verschrottix
Today at 12:16:32 AM
post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils]
Hydron
February 18, 2018, 11:59:59 PM
post Re: Regarding the Ward QCWDRSSTC
[Dual Resonant Solid State Tesla coils]
Steve Ward
February 18, 2018, 07:13:46 PM
post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils]
Steve Ward
February 18, 2018, 07:00:45 PM
post Re: Highway to DRSSTC
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
February 18, 2018, 03:08:02 PM
post Re: I told it was not here :P (sorry)
[General chatting]
Mads Barnkob
February 18, 2018, 03:02:27 PM
post Re: Moving to a new lab! (Part 1) Old basement lab tour and future projects
[Laboratories ]
DaiKen
February 18, 2018, 10:39:57 AM
post I told it was not here :P (sorry)
[General chatting]
AndreiRS
February 17, 2018, 04:19:58 PM
post Re: Afraid or frying another winding
[Spark gap Tesla coils]
AndreiRS
February 17, 2018, 02:56:44 PM
post Re: Afraid or frying another winding
[Spark gap Tesla coils]
profdc9
February 17, 2018, 04:02:13 AM
post Re: Estimating spark length voltage
[Electronic circuits]
AndreiRS
February 17, 2018, 12:12:40 AM
post Re: ElectroBOOM - MOT
[General chatting]
AndreiRS
February 17, 2018, 12:08:59 AM
post Afraid or frying another winding
[Spark gap Tesla coils]
AndreiRS
February 16, 2018, 11:59:07 PM
post Re: Moving to a new lab! (Part 1) Old basement lab tour and future projects
[Laboratories ]
AndreiRS
February 16, 2018, 11:51:26 PM
post Re: Highway to DRSSTC
[Dual Resonant Solid State Tesla coils]
Laci
February 16, 2018, 10:36:22 PM
post Re: Moving to a new lab! (Part 1) Old basement lab tour and future projects
[Laboratories ]
profdc9
February 16, 2018, 05:28:20 PM
post Re: (DR)SSTC music MIDI files
[Dual Resonant Solid State Tesla coils]
Tardief
February 16, 2018, 04:44:20 PM
post Moving to a new lab! (Part 1) Old basement lab tour and future projects
[Laboratories ]
Mads Barnkob
February 16, 2018, 08:55:47 AM
post Re: Measuring voltage and current on the DRSSTC bus
[Dual Resonant Solid State Tesla coils]
profdc9
February 16, 2018, 05:36:12 AM
post Re: Measuring voltage and current on the DRSSTC bus
[Dual Resonant Solid State Tesla coils]
Hydron
February 15, 2018, 11:44:23 PM
post Re: Measuring voltage and current on the DRSSTC bus
[Dual Resonant Solid State Tesla coils]
profdc9
February 15, 2018, 09:01:00 PM
post Re: Peak voltage on the DRSSTC caps?
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
February 15, 2018, 07:12:12 PM
post Re: Measuring voltage and current on the DRSSTC bus
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
February 15, 2018, 07:10:14 PM
post Re: Measuring voltage and current on the DRSSTC bus
[Dual Resonant Solid State Tesla coils]
profdc9
February 15, 2018, 05:57:14 PM
post Re: Measuring voltage and current on the DRSSTC bus
[Dual Resonant Solid State Tesla coils]
profdc9
February 15, 2018, 05:32:11 PM
post Re: Highway to DRSSTC
[Dual Resonant Solid State Tesla coils]
oneKone
February 15, 2018, 10:07:24 AM
post Re: Measuring voltage and current on the DRSSTC bus
[Dual Resonant Solid State Tesla coils]
Hydron
February 15, 2018, 09:45:42 AM
post Re: Peak voltage on the DRSSTC caps?
[Dual Resonant Solid State Tesla coils]
Hydron
February 15, 2018, 09:09:12 AM
post Re: Measuring voltage and current on the DRSSTC bus
[Dual Resonant Solid State Tesla coils]
Netzpfuscher
February 15, 2018, 07:53:55 AM
post Measuring voltage and current on the DRSSTC bus
[Dual Resonant Solid State Tesla coils]
profdc9
February 15, 2018, 03:42:30 AM
post Peak voltage on the DRSSTC caps?
[Dual Resonant Solid State Tesla coils]
profdc9
February 15, 2018, 02:16:10 AM
post Re: Highway to DRSSTC
[Dual Resonant Solid State Tesla coils]
Laci
February 14, 2018, 09:06:24 PM
post Re: Mini tesla
[Solid state Tesla coils]
Hydron
February 14, 2018, 11:21:33 AM
post Re: Mini tesla
[Solid state Tesla coils]
oneKone
February 14, 2018, 10:45:52 AM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General chatting]
Mads Barnkob
February 13, 2018, 08:16:52 AM
post Re: Regarding Chinese DRSSTC drivers on Ebay
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
February 13, 2018, 07:59:25 AM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General chatting]
AndreiRS
February 12, 2018, 11:52:35 PM
post Re: Regarding Chinese DRSSTC drivers on Ebay
[Dual Resonant Solid State Tesla coils]
Hydron
February 12, 2018, 05:24:45 PM
post Re: DRSSTC PCB pack (draft)
[Dual Resonant Solid State Tesla coils]
profdc9
February 12, 2018, 04:38:50 PM
post Re: primary coil support
[Beginners]
DaiKen
February 12, 2018, 03:44:13 PM
post Regarding Chinese DRSSTC drivers on Ebay
[Dual Resonant Solid State Tesla coils]
TDAF
February 12, 2018, 02:32:44 PM
post Re: DRSSTC PCB pack (draft)
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
February 12, 2018, 12:17:25 PM
post Re: Mini tesla
[Solid state Tesla coils]
Hydron
February 12, 2018, 12:01:10 PM
post Taxi Radio Basestation teardown – UHF/VHF Storno radio
[Radio frequency]
Mads Barnkob
February 12, 2018, 10:54:00 AM
post Re: Mini tesla
[Solid state Tesla coils]
oneKone
February 12, 2018, 01:14:10 AM
post Re: Mini tesla
[Solid state Tesla coils]
futurist
February 12, 2018, 12:21:33 AM
post Re: DRSSTC PCB pack (draft)
[Dual Resonant Solid State Tesla coils]
futurist
February 12, 2018, 12:20:55 AM
post Re: primary coil support
[Beginners]
Mads Barnkob
February 11, 2018, 10:24:31 PM
post Re: primary coil support
[Beginners]
DaiKen
February 11, 2018, 08:15:10 PM
post Re: primary coil support
[Beginners]
Mads Barnkob
February 11, 2018, 07:26:16 PM