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Messages - Rafft

Pages: [1] 2 3 4
1
Solid State Tesla Coils (SSTC) / Re: CORE FOR GDT AND CT
« on: August 05, 2022, 09:56:26 AM »
David

time to introduce the generic 'vga' gdt  ;) with its standardized dimensions, im pretty sure the specs wont have large differences from other manufacturers.

im sure the op could find a few

2
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: QCW questions
« on: July 20, 2022, 03:54:17 AM »

 ok no reason at all except for future reference.

I would just have to rewind my  existing 1:9:9 fb to 1:31:31 for the new self-osc circuit (only for fb, will use existing ocd)

pretty excited about the phase lead adjustment. will also house the entire UD board on a aluminum case.

thanks again  :)

3
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: QCW questions
« on: July 19, 2022, 11:16:33 AM »
David

regarding OCD, I have my 3rd CT(isolated) with 100Amp/per volt.

What do I have to modify so the existing LM311 have the same output?

I would be using my existing 1:32:31(currently ocd) to be the new fb_ct input.

thanks

4
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: QCW questions
« on: July 19, 2022, 05:58:33 AM »
thanks for the inputs David.

whole system got 'different' with my 1st mod attempt, mainly switching my 12v6 boost to 20vdc(powering whole UD) --->> Linear PS 24vdc with 7824. so making the igbt drive to 24v.

do remember these are counterfiet(!) IGBTs.. maybe they cant handle higher than 24v gate drive  ;D

my previous hardware UD ps was 20vdc(and 7809,7805). for the buck, 15vdc only for IGBT high- side driver. maybe its better to go back my previous PS voltage. and do the added GND planes for UD. and maybe add an opto for the buck input as well.

btw, about your phase lead input section on the other thread(20R 10uH 6R8), these values good also for 300KHz-450KHz operation?

edit1
I dont think some of the IGBTs are damaged. I always test them in low-power mode(45vdc & in DRSSTC mode only) and check bridge output. this I do especially when changing new GDT(phasing). I get about 100vpk2pk with a freq of around 410KHz. if all works, then proceed with the usual qcw

below images.bridge output.checked from usb 'wave' saves
**1 burst in DR mode, scope x10 probe x10(no cap in series)
** 410KHz on start (self osc IIRC was set to 480KHz)
** then at end of switching, settles to 360KHz (coil resonance)

5
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: QCW questions
« on: July 18, 2022, 11:36:59 AM »
David

as per your reply, here are some images and scopeshots.
blue=primary current , 1v=100amp
yellow=Full-bridge output, scope x1 , probe x10 with 2pF in series
note=I made a new GDT here. taken from VGA cables, making sure they both look the same. they have the same dimensions as per your posts. 3T and measures 40uH.

judging from my previous Iprim scopeshot, I think these now have better(?) results... same setup, only GDT changed. there are still those noise but are far lesser

**I have opto on the interrupt input (RCA)
***I have direct connections (GND) from arduino (pwm-ramp) to buck, but controller and buck are separately powered though they share the same GND. I wonder if I should opto-isolate this as well(?)
reason Im using opto is that fiber optic parts are hard to come by.

**point0000.png the initial ramping on the bridge output is 450KHz. and when Iprim starts ramping up, its 370KHz. and because of the 'fast rise' of bridge output, spark output branches early on! 

this -stuffs/early branching of arcs- just happened when I increased UD mosfet drivers supply from previous 20v supply(smps) to 24v Linear-regulated. and from the buck gate driver 15v(smps) to  25v Linear-UNregulated.

-or

just my controller settings!
edit: redid test, adjusted the 'wick' control, even to the minimum setting(virtually removing wick voltage) but there is still the 'quick rampup' on bridge output..

edit2 on phone photo. I have adjusted scope brightness to minimum. no its not 'quick rising'.

6
Mike

Interesting circuit!

edit:
have backread topic for more info.

@david
 would your latest schema here be UD2.1b friendly? primarily interested with the phase adj and the OCD section.

cheers
-Ralph

7
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: QCW questions
« on: July 16, 2022, 05:32:13 AM »
David

before, Ive had smps power for UD and buck control circuitry(Gao), power input from LiPo battery.

I have tried using Linear PS for the UD. IGBT driver ps is from 7824 regulator.

on the ramp buck side, Ive got the IGBT high-side driver in un-regulated 25vdc(17Vac traffo).

can you please check attached. where are those hashes/spikes coming from? previously, same problem with using smps power for UD and buck control.

edit: I was thinking maybe I would get 'cleaner' system with Linear PS for the logics and drivers.


the only smps power left, is the boost (16v8 to 300Vdc for buck power)



8
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: QCW questions
« on: June 06, 2022, 09:26:19 AM »
Thank you for the replies David

regarding UD, I will just leave it then. and Im using counterfeit IGBTs. who knows what the real specs of these are. I expect the worst.

cheaper scope probes voltage rating dimish fast even at 400KHz only . wow.  so I will just have to use x10 and ~2pF for monitoring bridge output. and x10 as well for Iprim scoping


9
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: QCW questions
« on: June 03, 2022, 07:11:06 AM »
Quote
Those look fine.  A slight reversal at the end of the main transition is not problematic.
Thats great!

Quote
Indicates you have sufficient dead-time and barely enough phase-lead.
with "barely enough", does this mean I need a slight component adjustment on the lowpass filter? ~1uH perhaps since my coil works better at lower frequency (370KHz). and perhaps why this is so, because of said IGBT being THAT slow? based on datasheet for 40T60, its calculated speed is said to be ~270KHz. when changing primary MMC from 13nF(Fres=370KHz) to 8.2nF(Fres=430KHz), the triple transitions have higher swing and Iprim more noise. so I take it as a hint that it could either be lacking on the lowpass filter, or slow IGBT (or maybe im wrong?)

Quote
Looks great!  Nice progress.
Thanks. goal is 1Meter for this battery-powered

Quote
All scope probes have reduced maximum voltage capability as frequency increases.  Some (especially cheap probes) drop dramatically at TC frequencies.
good info! seem to have forgotten about the freq response. but is ~400KHz too much for a 100MHz rated probe?

Quote
For many purposes you can get away with a small capacitor (of sufficient voltage rating) in series with the probe tip, value ~1pF.  I often home-make such capacitors with just two twisted insulated wires
I would go this route. gimmick capacitor. but probe switch set to x1 only? how do I set this up on scope?  and could I get an accurate voltage reading (for TC use) of these?


10
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: QCW questions
« on: June 01, 2022, 07:05:50 AM »
Hi David

testing from 4igbt to 8igbt inverter , I did modify the (Gao)buck to use discrete high-side driver, for more repairability than using UCC chip(from free samples few years ago). its all working as expected.

next was the self-osc mod. I added IC socket for adding parallel cap for freq adjustment. and used cheap ceramic ones. they have thin component legs(wiggled quiet easily), Im sure this is the reason why I see those hard-switched outputs. so I just soldered it (parallel cap) direct to board. one thing I also noticed was 'self-osc' should be far from the running freq, else I get dirty Iprim. Ive set my self-osc to 440KHz and my running freq is 370KHz.  my older setup with  self-osc=390KHz and running freq=370KHz resulted in ugly Iprim. anyways, Ive set my ocd limit to around 1.55V(155Apk). Ive tested 250Vdc bus and got good spark length. and there is always that triple transition :) I have also been trying a few coupling K.

spark length around 26-27" 250Vbus  around 130Apk 370KHz

btw, I have already killed 2 scope probes(open ckt). RIGOL PVP2150 on scoping the bridge output. is there an easy hack to converting this to something like x100 (probe in x10)?

addtl (last 2 attachments):
modified the ramp gen to do this(branching at tip), but only in 115Vdc bus:

11
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: QCW questions
« on: May 28, 2022, 03:45:31 AM »
to be more complete, I redid the scoping on 'peak' acquisition and did some more zooming
------
and as compared to a 'high-res' mode

12
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: QCW questions
« on: May 27, 2022, 01:50:22 PM »
David

yes each IGBT has its own (sb) diode. and about the ringing on fullbridge output, ive tried from the current 2R2(each igbt) to using 10R(and SB260 diode) 30v tvs as I ran out of 20v ones.bridge ourput ringing seems  to have gone down. also added more cap decoupling on the fullbridge bus rail(around 13uF).

primary LC is 17uH/11nF. im using a newer secondary 4" x 6.2" #30(about 18mH). I also noticed that using a bigger top load makes a great sounding thump than using smaller topload(harsh sounding).

I have a couple scope shots run on 230Vdc bus and Iprim=100A. I see ringing. im not sure where this comes from(already readjusted duty to 50% on self-osc). Im guessing its the IGBT(?)

spark length around 26" or so 230Vdc@100A. still needs some more tuning

13
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: QCW questions
« on: May 24, 2022, 01:14:22 PM »
Hi David

kindly check my scope shots. should I be worried about those negative going spikes? and why only on the negative side? and also, they only show when I change to shorter scope timebase. scope error?

Im now using 8pc IGBTs. BT40T60.  is it still ok to use 2R2 gate res for each IGBT? or should I raise it something like 5R since they are now connected as parallel.

14
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: QCW questions
« on: May 08, 2022, 07:43:13 AM »
Quote
Sounds like an issue with either internal scope crosstalk due to ground current or effects of imperfect shielding on coax.   

David, I tried  :)

15
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: QCW questions
« on: May 07, 2022, 06:52:29 AM »
the (kit)power supply I am using:
https://www.qsl.net/z33t/dc_0-30v_0-3A_eng.html

so I just set the 'current' pot to minimum, and checked if there is output voltage.yes there is.

ok my igbts are counterfiet, except the IRG im using in the buck switch.

my lcr meter shows. 0.00 reading with open leads. ill try using ferrites for the coax then. thanks

16
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: QCW questions
« on: May 06, 2022, 08:54:52 AM »
yes I agree, that gate capacitance is high as per datasheet.

the 2mA setting in PS was to somehow protect the LC meter(previous test w/o 100nF&10meg).

anyways, I had a full refund with that 40T60. 1 of the 10 igbt has zero capacitance reading gate/emitter(Vce @21vdc). im guessing factory defect? or because it was sent w/o an anti-static packaging

also, Ive used a bnc cable connection for checking Iprim. its somewhat clean on scope(ch2), but gets spikes when I  make connection with fullbridge output(ch1)

17
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: QCW questions
« on: May 05, 2022, 06:29:00 AM »
current regulated. its my CV CC power supply. I set it to 2mA only.

I have re-checked both igbts 60T65PES and 40T60 with 100nF(94nF actual) and 10meg


18
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: QCW questions
« on: May 05, 2022, 05:11:45 AM »
David

thanks for the test setup explanation.

Ive measured BT40T60 with Vce 21vdc(current limited) and with gate discharged.

attached also is screenshot of graph. is this the one to look up to? then 5nF is too high @21Vdc?

edit:
tested spare magna igbt. its about 4nF @21Vdc. so I guess the magna was still a bit better then? is 4nF way off with a genuine 60T65PES Cies=2.3nF?




19
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: QCW questions
« on: May 03, 2022, 02:49:04 PM »
too bad they are fake too. glad that it was refunded

thats why I dont overdrive much my 60T65PES  ;D

anyways I ordered(yet another) 10pcs because they where sooo cheap.
used my yellow LCR meter to check my un-used 60T65PES(for comparison) with these cheaper igbt. checked datasheet and gate capacitance seems close to the LCR reading. its only 80A@25degC so I will 'double switch' this for a full bridge and drive this to 150Apk. ran out of igbt heatpads, ordered them. will arrive 2 weeks tops.

will see if it holds up!

just curious, how did you test it to ~30A only? id imagine you also 'heat up' the igbt prior to testing

20
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: QCW questions
« on: April 24, 2022, 02:05:35 PM »
David

yes coil starts at upper pole around 475KHz then goes lower.
I have set back my primary to be 11uH/14nF(just like before w/o the 'upper pole initial freq') w/c has given me  longer spark output.

Im not sure why but when I go higher coupling, it likes more primary current( even at a lower Vbus) compared with the lower coupling. it should have been the opposite(higher coupling lower Pri current), or so ive read on other posts.

I was hoping to understand more about 'detuning' and if would help in any way with my coil setup

anyways ill UP my ocd to maybe something like 150Apk and see if nothing explodes.

regarding impedance, this is the topic im talking about. sorry if I havent posted link before. and Im talking the sweet spot of 10uH/15nF for MY COIL. if it makes sense.

https://highvoltageforum.net/index.php?topic=113.0

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[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
August 07, 2022, 06:46:44 PM
post Re: SCR precharge
[Dual Resonant Solid State Tesla coils (DRSSTC)]
alexhanyuan
August 07, 2022, 06:11:59 PM
post Re: BrOdin coil - High power Big sparks!
[Dual Resonant Solid State Tesla coils (DRSSTC)]
fh89
August 07, 2022, 08:25:56 AM
post Re: SCR precharge
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
August 07, 2022, 03:46:50 AM
post SCR precharge
[Dual Resonant Solid State Tesla coils (DRSSTC)]
alexhanyuan
August 06, 2022, 10:23:27 PM
post Re: MidiStick V2.0: Next gen tesla coil interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
davekni
August 06, 2022, 09:34:35 PM
post Re: Can someone help, am not getting any plasma :-) much appreciated
[Spark Gap Tesla Coils (SGTC)]
ItsChloeUwU
August 06, 2022, 07:49:05 PM
post Re: Primary Wire Getting Hot, Secondary flashovers, RSG Not Alway Fireing? Help pls.
[Spark Gap Tesla Coils (SGTC)]
ItsChloeUwU
August 06, 2022, 07:42:00 PM
post Re: MidiStick V2.0: Next gen tesla coil interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
AstRii
August 06, 2022, 07:05:35 PM
post Re: MidiStick V2.0: Next gen tesla coil interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
TMaxElectronics
August 06, 2022, 04:06:48 PM
post Re: CORE FOR GDT AND CT
[Solid State Tesla Coils (SSTC)]
Didik
August 05, 2022, 11:59:58 AM
post Re: CORE FOR GDT AND CT
[Solid State Tesla Coils (SSTC)]
Rafft
August 05, 2022, 09:56:26 AM
post Re: CORE FOR GDT AND CT
[Solid State Tesla Coils (SSTC)]
davekni
August 05, 2022, 06:25:39 AM

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