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Topics - John123
1
« on: November 23, 2022, 01:10:17 AM »
Can air cored inductors be influenced by proximity to other conductive things such as heatsinks even if nothing actually enters the inside of the windings? I'm talking about simple ones such as this:
2
« on: November 16, 2022, 03:27:06 PM »
Hi, is there a rule of thumb for selecting the minimum number of primary turns when driving these things using external primary windings on the exposed part of the core? For example in flyback topology to produce arcs what would be a good volt/turn rule of thumb to use for extended run times to reduce losses and saturation etc.
Also does switching frequency and max on time/off time ratio count with selecting turns? Right now I'm using 40khz and a max on time of 60% (audio modulated PWM limit) with 24v and 8 turns, arcs get bigger and power consumption increases if I reduce turns but obviously I assume there would be problems going down to say 3 turns. The driver currently doesn't have any peak current control so I'm being careful about keeping the arc continuous and steady rather than pulling them until they extinguish or letting the flyback run unloaded.
3
« on: November 16, 2022, 03:00:54 PM »
Hi, been away for while but back messing with electronics again Has anyone tried those bluetooth to aux adaptors to get an audio signal into their high voltage projects? These are the things I'm talking about. I'm finding they have a lot of background hiss which makes the plasma speaker sound worse than it actually is (I've isolated it to the bluetooth adaptor). Problem is these days phones all have touch screens which makes them behave weird when directly connected to such RF heavy high voltage projects so isolation is needed, old dumb phones with buttons behave when connected directly using an aux cable but then you can't use youtube videos for audio content on the fly with such old devices. Only thing that helped was to heavily passive RC low pass the input at the plasma speakers aux jack (hiss from the bluetooth is still there but nowhere near as noticable in the arc), but the corner cutoff frequency is right down around 30khz so it cuts into the audio range too. Is there some elaborate filter circuit I could use or maybe even some chokes to filter out this bluetooth induced hiss? Or maybe someone has found a bluetooth to aux adaptor which has clear hiss free audio. Please share thoughts and ideas here.
4
« on: March 18, 2021, 04:00:29 AM »
Could this work as a way to limit peak current? I know a dedicated SMPS IC would be best but as a quick and dirty protection method would it behave or just oscillate. Thanks.
5
« on: March 11, 2021, 05:59:45 PM »
Hello, I've whipped up a plasma speaker using a flyback transformer and TL494 (sounds pretty good and loud for the lowish 30 watts power consumption), however when the high voltage is running the touchscreen on my phone goes bananas. The phone is connected to the circuit as an audio source using the 3.5mm audio jack. What sort of filtering would I need to prevent the high voltage from interfering with the touchscreen? This is what I've currently got but it's not enough. The "clip on ferrite bead" is on the aux cable between the phone and circuit. When I use a Bluetooth to aux adapter as a means of isolating the phone from the circuit the screen works fine. The high voltage is about 20kV open circuit and about 30 watts, switching frequency is 40khz. The circuit is 24v battery powered so all floating, the phone is also on its internal battery power. Maybe an audio isolation transformer and more aggressive common mode/differential(?) choke? I recall this happening years ago too with an older circuit design except it was a laptop and its touchpad going haywire, back in those days phones didn't have touch screens however so it was never a problem using phones as an audio source. I'm guessing the capacitive touch screen is being charged up by the high frequency high voltage with one end of the loop being completed using the audio cable. Any advice would be appreciated!
6
« on: February 16, 2021, 12:08:52 PM »
You know that single transistor flyback driver which has been floating around on the internet since forever, does anyone know what determines a good transistor for it? I thought it was just a crap circuit until recently when I tried an MJ15003 and wouldn't you know it works great with little to no heating and most of the input power ending up on the output. But when I've tried 2n3055, MJE13007 and MJE13009 performance was poor, arcs were smaller and the transistor heated up a lot even with modest input powers (12v 2 amps for example), I can't seem to determine from the datasheets what makes the MJ15003 so special. Only thing I can see is: The MJ15003 and MJ15004 are power transistors designed for high power audio, disk head positioners and other linear applications. Here is the circuit except I'm using 12v with the upper transistor being 220 ohms and extra protection on the base via a Zener diode in anti-series with a UF4007, although that doesn't seem to make any difference to performance. The collector voltage is never allowed to exceed the c-e breakdown rating so I know its not breaking down and heating that way. tl;dr What makes a good transistor for this circuit? 2n3055, MJE13007 and MJE13009 were all poor giving small arcs and got hot fast whilst MJ15003 hardly heated for the same power levels and the overall input>output efficiency seemed pretty good. I've read online the KD60x or KD50x transistor series work well for this driver too.
7
« on: February 08, 2021, 07:27:52 AM »
Sorry if this is a basic question but I'm a bit rusty after almost a year since messing with this stuff.
You know those ZVS drivers and induction heater kits you get on ebay, does anyone know what types of resonant capacitors they use on them? I know they're rated for high frequency and high RMS currents, but have forgotten the what they're called such as polypropylene and MKP etc. Having to trawl through datasheets and find out if pulse and resonant duty is mentioned is very slow.
The red resin dipped job I'm currently using is getting pretty warm even in a 30w switcher!
8
« on: February 04, 2021, 04:42:44 PM »
You know those weirdly shaped heatsinks you get out of ATX power supplies, do they generally need fan assistance for good cooling? I'm using one which looks like this but not quite as wide to cool a MOSFET switching a transformers primary coil. Notice the sideways vanes at the top, the fan would of been blowing air from the side in the PC power supply. Its almost like it doesn't reject its heat very well in free air, over time the heat just seems to slowly build. Are the types with vertical fins on the back much better for free air cooling or does it not make much of a difference in practice? In theory a heatsink with vertical fins on the back should be better, but in practice does it amount to much? Thanks.
9
« on: May 02, 2020, 06:00:06 AM »
Not my websites but some sites I've come across full of resources for HV nuts. Is it ok to still post? http://flyback.org.ru/index.phpIts Russian but google translate is good enough for me, it's like a parallel 4hv except all the archives and posts + images from the last two decades are still up (sometimes you have to right click and open images in new tab to see them). Some interesting schematics hiding around there including designs which think outside the box. http://danyk.cz/index_en.htmlDiodeGoneWild from youtube, I swear this guy is a genius. https://4hv.org/e107_plugins/forum/forum.phpNeed I say more? Unfortunately the images don't work anymore and the archives are no longer accessible, but there's still a wealth of information in the remaining posts. The forum doesn't seem that active anymore sadly (I think that's why this place was created). http://kaizerpowerelectronics.dk/Ran by our lord and master Mads Barnkob, lots of good circuits and theory on there.
10
« on: May 01, 2020, 07:20:58 PM »
Anyone ever seen a primary MOSFET snubber like this before? That auxiliary winding is on the main core of a TV flyback transformer, primary and aux winding look to be about 5 turns each in the photos of where I found it here https://hackaday.io/project/160041-plasma-speaker-exploring-properties-of-plasmaJust wondering if any of you have seen this arrangement before? Being a plasma speaker it's probably been designed with sound quality in mind, but still I've never come across this before. On the other hand the circuit appears to be tripping the current limit on his PSU at 5.2 amps 20v, but the arc looks like 20-30w worth of hv. He appears to be using a big heatsink with a fan too so I'm guessing a lot of power is being wasted in silicon heating.
11
« on: April 01, 2020, 05:17:04 PM »
Any tips and tricks you guys could recommend? I've got an Nikon D3100 DSLR, but I'm having trouble getting a good shot of high voltage arcs like some of the photos I've seen around here.
I can't really explain it, but the shots and videos come out looking underwhelming. I'm thinking its the transparent nature of these arcs which are low current purple-blue color. I'm actually trying video too but the camera wants to set up for the rest of the room rather than the arc. I've tried closing the blinds slightly to darken the room during day time, but the camera adjustments are all geared toward low light in that situation.
The arcs stretch to 2 inches and when the electrodes are closer together they're at that state where the arc is pink and just starting to look like a flame. When stretched out to the max it turns that pale blue color and the arc starts to break up.
Mads I've seen on your website lots of good arc pictures and videos, any DSLR pointers?
12
« on: April 01, 2020, 02:01:30 PM »
On paper a fast recovery body diode seems good, but when I check through other products I notice many manufacturers make the same MOSFET model with fast recovery and slow recovery body diode options (SIHG039N60EF vs SIHG039N60E in my case).
Are there trade offs with the fast recovery versions in general other than cost?
13
« on: March 28, 2020, 12:59:08 AM »
Hello again, I'm in lockdown and have gone flyback mad! What TVS reverse stand off and breakdown voltage would you guys select for a 400v transistor? I've gotten myself confused when it comes to TVS datasheets. I'm running a TV flyback transformer like in the pic at 12v, it's actually quite efficient with nothing getting that warm drawing about 2 amps from the 12v supply and a 2 inch arc (still working on 24v mode). Frequency is about 15khz. The TVS will not conduct under normal operation as the capacitor is selected to limit the peak voltage to something sensible (about 170v peak right now when the output is unloaded), the TVS is just added protection for unloaded flyback output and capacitor charging situations. However by reducing the capacitor value and allowing the primary voltage to peak higher I can get more hv on the output without needing to increase the supply voltage, so I want to select a TVS which protects the transistor but doesn't conduct under normal operation. But here's where I'm stuck, I've currently got a 200v TVS in there and when I retuned the capacitor to allow for more peak primary voltage the TVS clamps much harder than I expected. I'm looking at the datasheet for the P6KE200 and was expecting maximum peaks of 274v, but reality it clamps pretty close to the 200v breakdown rating rather than shooting up that large exponential curve. I'm guessing the energy in the circuit isn't enough to push the TVS to such a high clamping level? And if that's the case what TVS voltage can I safely go up to for protecting my 400v NPN transistor (MJE13007)? Maybe the 300-350v standoff versions would be best suited, they're pretty expensive so I wanted check before ordering something which might not be a good choice, then there's the whole transistor safe operating area to further complicate things. tl;dr which TVS diode breakdown would be a good choice for protecting a 400v transistor switching 15khz tv flyback at 2 amps average primary current? Thanks.
14
« on: March 25, 2020, 06:46:49 PM »
How much overhead do you guys leave when choosing power resistors? For example i've got a 22 ohm 3w resistor dissipating about 2.5w continuous, its green in colour and about 15mm long by 4-5mm wide. As expected it runs red hot, but something weird happens after a little while in smoke starts coming from it. I checked with the scope and it definitely doesn't go above 3w RMS, so I assume it's just my finger oils or there's some kind of derating thing going on. The 2.5w dissipation needs to be continuous without smoke. I don't have a datasheet for this random resistor I found in my parts bin, but do they often have deratings for when they run hot? How much headroom do you guys leave for selecting power resistors for continuous duty? Obviously the higher the wattage the larger they get which is why I went for a smaller size. Also the resistance seems pretty stable with temperature, so its not drifting in resistance and causing more power dissipation.
15
« on: March 11, 2020, 08:26:15 AM »
In a crt tv/monitor hv flyback transformer what is the effect of making the gap in the core bigger or smaller? Let's assume the drive topology is flyback, would making the gap bigger between the two core halves allow for more output voltage/power if everything else like primary voltage, number of turns, drive frequency and duty cycle stayed the same?
16
« on: March 05, 2020, 09:37:59 PM »
When trying to discharge a big capacitor bank into a load using a chicken stick it wastes a lot of energy in sparking, energy which doesn't get dissipated in the load.
Is there some kind of go-to SCR or contactor to reduce wasted switching energy? Assume the load in series is very low impedance, wouldn't it just destroy the switching device too?
17
« on: March 01, 2020, 03:22:20 PM »
Would what this guy is doing be classed as a flawed method of testing power MOSFETs? https://www.youtube.com/watch?v=YWXgMJz9IBUTo summarize, he's connected a HV ferrite cored transformer to some kind of single ended oscillator driver (not sure but could be a 555 timer) and is swapping MOSFET's on the fly to determine their worthiness based on how big of an arc he can make when used to drive the primary coil, but in a few tests he had to retune the circuit to get any kind of spark. Is this just a case of parasitic capacitance being changed with every different fet thus the harmonic sweet spot for best arc size is being shifted around? He deems any fet which doesn't work as "not fast switching". Obviously on resistance and the breakdown/avalanche rating of the fet probably has something to do with the final output voltage (it's being run with no snubbing at 15v so avalanche ratings are probably going to clamp and limit some of them). I'm not trying to be mean to the guy as I like his channel, but to me it doesn't seem like an accurate test.
18
« on: December 21, 2019, 12:09:02 PM »
What happens if you connect the HV return pin of the flyback transformer to the drain of the MOSFET like this? Could that solve leakage inductance complications and put it in series with the secondary? Have I invented a masterpiece or a power supply/driver killer?
19
« on: December 18, 2019, 06:44:23 AM »
You know those film capacitors people put in series with the tesla coils and gate drive transformer primary, how do they decide the value? Is it just a case of capacitive reactance or is there something else going on?
I've seen some people use 100nF all the way up to 10uF for tesla coils, how do they choose? I've got a little half-bridge running a CRT flyback transformer at 40khz and at first I used 1uF, but saw some improvement to the gate drive waveforms when I added an extra 1uF in parallel.
20
« on: December 14, 2019, 01:54:55 AM »
What are the modern go-to power MOSFETS/IGBT's these days? You know for the usual SSTC or high voltage driver duty, back in 2010-2012 IRFP460 was usually recommended for mains stuff whilst IRFP260 was generally recommended for lower voltage drivers (even though the 200v drain-source breakdown voltage was a bit wimpy imo). Is 55 milliohm on resistance still considered low for a high voltage switching fet?
Also are IGBTs much better these days? Would be interesting to see what's changed over the last 8 years, the last "exotic" 600v, 33 milliom MOSFET I tried had a nasty drain to gate capacitance.
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Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
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alan sailer April 11, 2024, 12:58:52 AM
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Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
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Michelle_ April 11, 2024, 12:31:37 AM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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alan sailer April 11, 2024, 12:30:21 AM
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Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
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alan sailer April 10, 2024, 11:41:46 PM
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Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
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Mads Barnkob April 10, 2024, 11:33:32 PM
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Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
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Michelle_ April 10, 2024, 10:41:33 PM
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Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
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MRMILSTAR April 10, 2024, 10:31:31 PM
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Tesla coil safety questions, risk analysis quantified
[Beginners]
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Michelle_ April 10, 2024, 09:56:35 PM
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Re: Drsstc voltage spike question
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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unrealcrafter2 April 10, 2024, 08:59:26 PM
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Re: Drsstc voltage spike question
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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markus April 10, 2024, 06:35:30 PM
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Re: Drsstc voltage spike question
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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flyingperson23 April 10, 2024, 05:35:14 PM
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Medium Drsstc question
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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unrealcrafter2 April 10, 2024, 03:07:02 PM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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Michelle_ April 10, 2024, 03:42:12 AM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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Michelle_ April 10, 2024, 03:41:04 AM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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sky-guided April 10, 2024, 02:50:23 AM
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Re: DRSSTC V1 using BSM1500
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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Unrealeous April 10, 2024, 01:32:17 AM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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OmGigaTron April 10, 2024, 01:26:29 AM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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OmGigaTron April 10, 2024, 01:18:35 AM
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Re: Big Coil Big Sparks
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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Mads Barnkob April 09, 2024, 07:34:19 PM
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Re: DRSSTC V1 using BSM1500
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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flyingperson23 April 09, 2024, 06:14:27 PM
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Re: CM400 Induction Heater
[Electronic Circuits]
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markus April 09, 2024, 06:08:53 PM
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Re: DRSSTC V1 using BSM1500
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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markus April 09, 2024, 05:15:19 PM
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Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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Michelle_ April 09, 2024, 05:11:04 PM
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Re: Big Coil Big Sparks
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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Benjamin Lockhart April 09, 2024, 06:32:16 AM
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DRSSTC V1 using BSM150
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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Unrealeous April 09, 2024, 04:04:47 AM
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