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Messages - davekni

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1
Are the dead EBL AAA cells completely dead or just won't run the calculator reliably?  In case it is a printing calculator or for some other reason draws step load current, that can be an issue with these cells.  At light load internal regulator is in a low power mode.  Response to step load isn't instantaneous.  Haven't scoped step response yet.  But I do know that AA cell powering a wall clock with second hand stepping once per second is not reliable.  Works most of the time, but occasionally the step response causes clock to miss a second.  The EBL AA cells are a bit worse for this, but the Hixon ones still cause the clock to occasionally miss a step.

2
Quote
And another questión. I´m going to use one 24V power supply. I have put a 220ohm resistor in point A to use the 24Volts directly. And to power the ZVS driver, I put in the 24V power supply a DC-DC converter to vary the output. There is no problem taking the current for the gates and to power de ZVS from the same power supply right?

I have instaled a relay that allow to power the ZVS only when the gates are already with the 24volts to be safe.
Yes, that should work well.  Presuming the existing 470ohm gate pull-up resistors are rated for 2 watts as listed in schematic, they will handle 24V directly.  No need for 220-ohm resistor to reduce power.  As a bonus, with 24V directly to gate resistors the FETs will switch faster so dissipate a bit less power.  Removing 220-ohm resistor also increases startup oscillation amplitude before relay closes, making startup even a bit more reliable.

3
Quote
I'm not sure what the issue is, one possibility is that the ferrite cores I'm using for the CT are not good, as the N30 cores I had ordered were too small, so I had to use some other cores I had laying around. But I had tested them by making a GDT with them and connecting them to the output of the UD2.7C output while using a function generator as the feedback. The output waveforms looked good so I assumed the cores were good enough to use for the CT.
Did you test both core types within CT?  First stage gray/black core is likely ferrite.  Second stage green cores are more suspect.  Also, UD2.7 GDT drive is reasonable low impedance, so may make somewhat reasonable waveforms even on a poor GDT core.

However, I'd guess that CT core type isn't the main issue.  Might become more of an issue when tuning phase lead.  Without JavaTC information or some other basic specifications for your coil, hard to guess at issues.  284A may not be sufficient for your coil design.

4
Quote
I finally got around to fixing this UVLO properly.

I removed R30 the 4.7K resistor and added an LM385 1.25V shunt regulator and a 2.7K in series, from the negative rail to TP2 (the LM8365 input).
It works perfectly now with the UVLO activating when the supply drops below 20.5V and not coming back on again at a low voltage at all!

I think now I can safely run my coil with just one power cord.

Thanks again Dave for your sugestions.
Great to hear it is working as expected!  You are certainly welcome.

5
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: DRSSTC Questions
« on: March 27, 2024, 04:41:59 AM »
Quote
The only reason I can think of that this effect is not used in tesla coils is that it would encourage secondary to
ground arcs.
Yes.  Before finding this forum, my initial DRSSTC construction had a strike ring with small points.  Exactly that problem, strikes from part way up secondary to strike ring.

6
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: DRSSTC Questions
« on: March 26, 2024, 04:16:24 AM »
Quote
Other than raising the top-load I'm not sure what to do about this.
Looks like raising top-load a bit might be good for another reason, to avoid shorting upper turns of secondary.  A bit of gap between top of secondary and top load allows secondary magnetic field to exit top and return to bottom.  Will reduce secondary frequency a bit, so may need retuning.

7
Quote
https://protectglobal.com/products/fluid-containers/protect-foqus-600i-1100i-fluid-container/
Interesting!  I hadn't heard of "smoke" machines being used for security before.

8
Electronic Circuits / Re: CM400 Induction Heater
« on: March 26, 2024, 04:00:43 AM »
Quote
I'm trying to wrap my head around why higher frequency is more effective on nonmagnetic loads where we do not have hysteresis losses - is it because higher frequency leads to a higher voltage across the work coil?
Yes, higher work coil voltage, which translates to higher volts/turn at load too.

Quote
With a steel tube in the coil, you might end up with a Q as low as 4, which allows you to transfer 34/4 = 8.5 kW while staying within the ratings of your capacitors. For solid steel well matched to the size of the coil, Q might be 5 - 8, up to a few times that for smaller work pieces. For aluminium workpieces, a Q in the 20 - 50 range is not unrealistic, and for copper it can exceed 100.
Anders:  Any idea what Q range would be for graphite crucibles?  I'd expect Q to be well lower than for directly heating copper or aluminum.  If I understand correctly, Markus' plan is to use graphite crucibles for melting.

9
General Chat / Re: Re-chargeable 1.5 volt lithium ion AAA batteries
« on: March 26, 2024, 03:19:18 AM »
I've tried EBL AA and AAA and Hixon AA.  I've been quite happy with EBL "9V" LiIon batteries (8.4V fully charged).  EBL 9V batteries I've tested meet their claimed 600mAH, which is quite good for 9V battereis.  The EBL 1.5V cells do not meet their claimed energy rating, and their charger is not very friendly to the internal LiPoly cell.  No failures yet, but I feed the charger 4.2V instead of 5V to make charge current taper towards full charge as it should.  The Hixon AAs are close to their rated energy spec, and their spec energy is a little higher than EBL's.  The Hixon charger properly tapers current too.  Had a hard time finding Hixon AAA cells, however.
Above were versions using separate charger, not ones with built-in USB charging port.

10
Solid State Tesla Coils (SSTC) / Re: Odd MOSFET Driver Behavior
« on: March 25, 2024, 02:39:40 AM »
Most likely issue is GDT secondaries being mis-wired, causing the two IGBTs of a half-bridge to be on simultaneously.

11
Quote
I purchased my globe from Wayne Strattman
https://strattman.com/
I ended up going with a 2-liter Globe filled with Xenon.
Looked at that web site.  Didn't find any specs other than xenon and 2-liter.  Is fill pressure listed?  Glass thickness?  If you have a scale, weight would allow an estimate of average glass thickness.  I gather that typical xenon pressure for toroids is 15 to 50 torr.

Quote
Which forum would be best for my project?
Good question.  Hope others will respond here.  I don't see an obvious fit.  Some previous plasma toroid posts are within the SSTC topic.

Quote
But I plan on doing a lower-power version and using Mosfets / IGBT.
Frequencies for plasma toroids are generally far too high for IGBTs.  Most use either standard Si or faster SiC FETs.  I'm planning to use an SiC FET when I eventually get around to experimenting.

Quote
Eventually, I'm gonna power it with tubes.
Tubes are more forgiving of mistakes.  They don't fail as instantly as do FETs.  Might be less frustrating to use tubes from the start if that is final goal.

Quote
And if it is allowed, I would love to involve the community in a discussion of the theory involved.
Yes, definitely.  There are physicists on the forum, at least one besides myself, probably more.  There is some theory discussion in this existing plasma toroid thread:
    https://highvoltageforum.net/index.php?topic=2247.0

Quote
I have so many wild questions, and don't mind being corrected, especially by competent engineers, who can teach me how to do it properly.
Yes, the forum is definitely for questions, not just display of projects.

Looking forward to seeing your progress.  The more I learn before trying one myself, the easier it will be.  My goal is to generate a sufficiently strong initial magnetic field that toroid ignition occurs from magnetically induced field, not requiring capacitive coupling to start.

12
Quote
I found a old and discarded smoke cannon at a scrap yard! It looked in rough shape, but still had some oil in its container. With a bit experimentation and at last forcefully feeding it oil, it gave off its smoke!

As a bonus, I got most of my workshop lubricated from half-burned oil smoke raining down droplets everywhere!
Do these old machines actually use oil?  New "smoke" machines generate glycerine vapor condensing into a fine aerosol, not actual smoke.  Much less hazardous to breathe.  Though there is some concern for stage performers who are exposed to glycerine aerosol very frequently.  Liquid fed to these machines is typically a glycerine/water mix.  Not sure of propylene glycol is ever added to the glycerine/water mix as is common for personal vaping products.

13
Quote
I was planning to wire the extra gates with more GDT secondaries
Yes, I think that would be best, with a caution.
Split MMC balances current at coil frequency.  High frequency (H-bridge output transition edges) are connected more directly through MMC sections that are low impedance at high frequency.  H-bridge output transition timing needs to match.  So GDT windings and lead lengths should be matched including matched coupling to primary.
Best GDT performance (lowest leakage inductance) is using a twisted pair for each gate, half of each pair to IGBT and other half to primary.  All primary windings paralleled.  Ideally each primary winding is twisted together all the way back to driver, connected in parallel only at driver connections.
    https://highvoltageforum.net/index.php?topic=1854.msg13949#msg13949

14
Quote
I got a differential probe and measured the voltage across the 51ohm resistor and got the following waveforms. I tried adjusting the phase lead but the voltage spikes didn't reduce that much. Note: The spikes and noise in the current waveform were due to some interference in the differential probe. They were not present when I was using the current probe.
Phase lead looks reasonable.  Spikes are likely not enough to cause problems.  I'd guess spikes are due to H-bridge inductance.  Even good H-bridge construction still has some inductance, from interconnect, IGBT internal leads, and capacitor inductance.
Current waveform spikes may be at least in part due to inter-winding capacitance of CT.  Probably not an issue.  UD2.7 has a small capacitor on CT feedback intended to filter out such spikes.
Current probe's limited bandwidth would not pass such high-frequency spikes.  No way to know if they would be there or not with a higher bandwidth current probe.

15
Quote
I'm measuring the primary current using a Tektronix current probe rated for 100A.
That probe is rated for 100kHz bandwidth.  Delay within probe is likely as much or more than phase lead adjustment range.  Easier and more accurate to measure voltage across 51-ohm CT burden resistor on UD2.7 ECB.  (Or make another CT secondary core/winding with its own burden resistor.)

Quote
The yellow waveform is the Collector-Emitter Voltage of one of the IGBTs and the blue waveform is the primary current.
Video is a bit too fuzzy to decipher time/division setting on scope.  What is time/div (or what is coil operating frequency)?

Quote
Is it because my inductor is bad?
Inductor itself looks great.

Quote
The inductor wire leads are too long?
Leads appear to be twisted, so likely not a problem.

Quote
Or because its not shielded?
Yes, that may be a problem.  Depends on proximity to TC primary coil.  A large unshielded inductor makes a good pickup for magnetic field.  One easy way to tell if this is a problem:  While scoping phase as you did, change inductor orientation (while leaving inductance constant).  Will be most sensitive to orientation at maximum inductance (core inside coil).  If scope display changes (frequency and/or phase) as inductor is reoriented, shielding is needed.  (Or move inductor farther from TC primary.)

BTW, nice variable inductor implementation.  I've made DIY variable inductors, but using friction-fit, not with nice screw adjustment.

16
Quote
I plan on building a Plasma Toroid circuit, and after studying quite a bit of the works of people who have built, and designed similar circuits, I figured this would be a great place to document and share these designs.
Hopefully, this is a good place for this and there are still active members.
Yes, there are certainly active members and discussions here.  Would love to learn about your build.  Plasma toroid experimenting is on my list of future some-time projects.  At least initially I'll use argon because it is cheap and I can easily play with pressure.  Do you have a good source for a glass globe filled with xenon or other gas mixture?

BTW, my sister lives in Lafayette, LA, so I'm a bit familiar with Louisiana.

17
Home made HV capacitors are surprisingly difficult.  Creepage distance (distance along an insulating surface) is much larger than air gap distance for a given breakdown voltage.  And 30kV/cm is for perfectly uniform conductors on either side of a gap.  (Think large diameter smooth spheres with small gap distance compared to diameter.)  Other shapes cause field concentration at points and corners and edges.  I've tried making HV capacitors many times.  Only successes are for moderate voltage and limited lifetime use such as ~5kV for an air (nitrogen) laser.

18
Quote
1) If i use 2 GDTs is it better to use one for each of the bricks or one for top IGBTs and other for bottom IGBTs?
One GDT per brick (one per half-bridge) is better.  Uniform load on both edges for each GDT, one gate rising while other gate is falling.  Keeps dead-time uniform.  And some pulse-skip drivers require 2 GDTs connected this way (one per half-bridge).

Quote
2) If i use signle wires instead of a cat5 cable is it better to have as many primary wires as secondary wires on the GDT? And having them twisted together
Yes.  Twist each pair (one primary and one secondary) together within coil winding.  Twist each primary winding lead pair separately.  Parallel the four (or two) primary windings at driver.

Quote
3) How much for coil this size does GDT wire crosssection matter and is there optimal crossection for a GDT.
Don't think wire gauge is very critical, but get other opinions too.  Ratio of wire diameter to insulation diameter does matter some.  Thicker insulation is best combined with larger wire diameter too.  That keeps parasitic (leakage) inductance from rising.  (Leakage inductance for twisted pair windings is proportional to log(wire spacing / wire diameter).

Quote
4) Am i correct to assume that its better to keep the GDT wires as short as possible and use shielded wire for the primary? (GDT would be way closer to igbts than the driver circuit)
If primary leads are twisted, shielding shouldn't be needed.

19
Quote
It is rare, however I think relying on luck to prevent destruction of IGBTs is not the path I'd take
Rare is a relative term.  For normal axial-leaded wire wound power resistors, I think "rare" is close enough to never.  Meteorite impacts are rare too.  I spend no time being concerned about coil destruction by meteorite impact.

20
Beginners / Re: No Corona Discharge with ZVS Driver
« on: March 15, 2024, 12:00:51 AM »
Quote
What do you mean by a capacitor value which is used in which original circuit?
HV flyback transformers were mostly built for CRT displays (TV sets and computer monitors).  When used in CRT circuits, drive looked close to your 555 circuit, but with a capacitor across primary winding terminals.  Unfortunately I have no way to know what value was actually used for any given flyback primary.  Probably less than 0.68uF, perhaps between 10nF and 100nF.  If you have an oscilloscope, proper value can be estimated by checking waveforms.
Without any capacitor, IRFP260N FET is going into avalanche breakdown on every on-to-off transition.  Wastes power and heats FET.

Quote
I have added the circuit diagram of my Flyback as an attachment.
I presume IRFP260N source connects to ground rather than +7V as shown in your 555 schematic.

Quote
I used the coil between pin 1 and 2 as the internal coil for the 555 Circuit.
Do you have a specification for this flyback transformer?  There's no way to tell from the schematic which pins were intended for primary drive.  Primary winding likely has low resistance (larger wire diameter) than most other windings.
Have you tried swapping pins 1 and 2?  For flyback drive into rectified secondary, output voltage will be much higher with one polarity than the other.
Most CRT flyback primaries are designed to be driven by higher voltage FETs, usually 900V to 1500V FETs.  Other primary windings may work well with lower voltage FETs, but also may have higher DC resistance and over-heat with continuous operation.

Quote
Now i can create much more corona discharge, but is it possible to create the same result with the zvs driver?
It is still much more efficient.
By "efficient" do you mean it draws less current?  That would be expected for a circuit generating less output power.

Because ZVS waveforms are symmetric AC sine waves, flyback output can't reach quite the same voltage as with proper flyback drive (555 style drive) into correct primary coil with correct FET voltage capability and parallel capacitor.  However, ZVS can likely achieve enough for your interests.  Difficult to debug without a scope.  I'd suggest first selecting ZVS cap value to hit desired frequency, say 20kHz.  Then increase voltage to ZVS circuit until output reaches what you want.



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post Re: Welcome new members, come say hello and tell a little about yourself :)
[General Chat]
Mads Barnkob
March 19, 2024, 05:01:41 PM
post Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
March 19, 2024, 04:31:02 PM
post Re: 160mm DRSSTC II project | Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
March 19, 2024, 03:59:54 PM
post Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
March 19, 2024, 06:41:39 AM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General Chat]
davekni
March 19, 2024, 04:05:49 AM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General Chat]
OmGigaTron
March 18, 2024, 09:08:35 PM
post Re: Can I Trust This Super Cheap Site?
[General Chat]
2020-Man
March 18, 2024, 09:07:35 PM
post Re: Can I Trust This Super Cheap Site?
[General Chat]
Twospoons
March 18, 2024, 08:57:06 PM
post Re: Can I Trust This Super Cheap Site?
[General Chat]
MRMILSTAR
March 18, 2024, 03:51:33 PM
post Re: 160mm DRSSTC II project | Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Late
March 18, 2024, 02:59:46 PM
post Re: 160mm DRSSTC II project | Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Late
March 18, 2024, 02:33:25 PM
post Can I Trust This Super Cheap Site?
[General Chat]
2020-Man
March 18, 2024, 11:02:12 AM
post Re: Where's all this voltage coming from?
[Spark Gap Tesla Coils (SGTC)]
Twospoons
March 18, 2024, 02:36:11 AM
post Re: Best forum for vacuum tube amplifiers?
[General Chat]
Mads Barnkob
March 17, 2024, 07:42:55 PM
post Re: 2x Panasonic Inverter Microwaves - what to salvage, dangers?
[General Chat]
Michelle_
March 17, 2024, 04:15:14 PM
post Re: 2x Panasonic Inverter Microwaves - what to salvage, dangers?
[General Chat]
Michelle_
March 17, 2024, 05:05:04 AM
post Re: Where's all this voltage coming from?
[Spark Gap Tesla Coils (SGTC)]
davekni
March 17, 2024, 04:50:51 AM
post Re: 2x Panasonic Inverter Microwaves - what to salvage, dangers?
[General Chat]
Twospoons
March 17, 2024, 04:45:17 AM
post 2x Panasonic Inverter Microwaves - what to salvage, dangers?
[General Chat]
Michelle_
March 17, 2024, 04:17:51 AM
post Where's all this voltage coming from?
[Spark Gap Tesla Coils (SGTC)]
Terry
March 17, 2024, 01:29:32 AM
post Re: DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
March 17, 2024, 12:33:06 AM

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