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Messages - babass
Pages: [1]
1
« on: January 31, 2020, 01:45:27 AM »
Thanks for the link. My capacitor should work just fine. I'll try to use this one. Also, I'm now using PCBs for my circuits. And it seems to work even better now. I stuck a little heatsink on the driver ICs. I probed the signal between gate and emitter of an IGBT, and the signal is nearly perfect. No oscillation. For the freewheeling diodes I'm using 4 DSEI30-06A, rated 600V, 37A, 35ns. I think that's fast enough. But they are heating a little (not a lot, just getting warm a little) is it normal ?
2
« on: January 28, 2020, 10:02:54 PM »
Little mistake here, I was talking about R2, R1 is set to 1k. Anyway, since the beginning as my resonnant frequency was pretty low (220kHz) I didn't put a capacitor on the top of my tesla coil. But I tried to add one "just too see" and... it works much MUCH better. I think the even lower resonnant frequency makes the phase between the current transformer and the driver circuit even lower. Also I need to add a DC blocking capacitor to avoid excess heating from my IGBTs. I apparently need a MKP capacitor that would act as a dead short at the resonnant frequency. I found the one in the picture. Will this one do the trick ?
3
« on: December 10, 2019, 11:24:50 PM »
My scope does have a trigger input, but never managed to get it to work. As it's a "recycled" scope at school, it might be brocken. Anyway I connected 1 channel at the output of the 4069, and 1 channel acting like an antenna. I tried to adjust the phase by replacing R1 by a potentiometer, it won't change anything, even with a 100k pot, and it ended up smoking. Phase won't change and emited sound isn't louder at all. I'll try changing the capacitor value maybe, if I choose a capacitor with similar impedance of the current transformer one maybe it will work better.
4
« on: November 29, 2019, 09:40:00 PM »
About the time the signal amplitude ramps up faster than it ramps down, I have no idea as well, I'm still using a 4069 for now, I don't know if it can explain this. Anyway, if I replace R2 by a potentiometer, maybe I can adjust the phase shift at high power to get optimal results, right ? and them replace it with normal resistors, I think it won't survive for long. Or should I keep R2=1k and change the capacitor value ?
5
« on: November 28, 2019, 06:10:51 PM »
Ok, I decided to change the core. I took the same I used for my GDT. 50 turns, got L = 12,6mH (so it confirms the Al=5000) and... it works . So as I'm using a 1k resistor in series with the transformer, it means that I have a 86,6° phase lead ? The goal here is to be as close as 90° right ? So as my core is quite big, is making much more turns would be a good idea ? And when you say 1 turn at the primary, do i need to make one turn with the ground cable, or just going through the core as I'm doing on the picture (I tried making a turn, wont change anything much). And what's the purpose of R1 on your schematic ? But when I try to higher the voltage across the primary the Tesla will start making weird noise and eventually my power supply (some lab power supply, 120V 1A max) will shut down. Cas this be due to bad feedback again, or just my power supply can't handle powering the Tesla coil ? On the second picture, my scope with a little wire plugged in as an antenna, showing the 220kHz pulses emitted by the Tesla coil (enable pin connected to a 555 generating a 50% duty cycle square wave signal).
6
« on: November 28, 2019, 01:17:35 AM »
I tried to use a feedback transformer. I only did about 32 turns on a about 800 Al core because the wire I was using is too short. Anyway, it somehow works, but it's not consistent, again. If I inject a tone signal on the enable pin of the drivers the sound coming from the top of the tesla is quite low and full of noise (lot of clipping sound), seems like the transformer keeps loosing the signal. And if I bring a piece of metal on the top of the tesla to trigger an electric arc the tesla will stop working as soon as the electric arc apprears. However it works fine with a 555 instead of the antenna (very loud and clear buzzing sound, once it's tuned correctly). By removing R1 from your schematic it's a little bit better. I also tried inverting the tesla coil primary wires. I tried to make 2 or 3 turns at the primary of the feedback transformer, but it won't change anything. Tried with both 4069 and 74hc14.
7
« on: November 24, 2019, 12:13:51 AM »
Eh, well, I tried different resistors, I can't get it to oscillate (74HC14). With a capacitor between pin 1 and ground (and much lower capacitance value, like 100k) I got some oscillations, but very inconsistent and very low peak voltage (barely 1V). I don't get it... I'll try that feedback transformer like this one http://www.loneoceans.com/labs/sstc2/sstc2schematicv10.jpgThey use a core with 50 turns on it. What would be the ideal core (AL value) ?
8
« on: November 22, 2019, 12:15:26 AM »
I found some BYW80-150, BYW81PT-200 and BXT08PT-400 (don't know if it's PI or PT). The last one seems to be able to hold 400V reverse voltage and 8A of current. But I don't know how fast should my freewheeling diodes have to be. I'll try more experimentations with 74HC14 chip.
9
« on: November 20, 2019, 10:05:50 PM »
Ok thx for the help. So, I tried adding a 1Meg resistor, with no luck . I couldn't find anything about your "current-sense feedback". Are you using a current transformer at the "bottom wire" of the secondary of the tesla coil (the one connected to ground) ? Then you use clamping diodes (is 1N4148 any good for this ?) to lower the voltage and send it in the input pin of the inverter chip ? Concerning my driver heating issue... I added few capacitors, giving the enable pin a 50% duty cycle signal... and the problem is somehow gone. It keeps heating but it's not as fast as before, I can definitly put my finger on it after minutes without any problems. So with a well designed PCB it should be fine. I need to lower my gate resistors, as you can see on the scope, it takes too much time to load / unload the IGBT gate. But... it works well, my IGBTs are heating a little under 60V cuz of too high gate resistors but... I modified my GDT since, about 600µH at the primary, 0.6µH leaking inductance. I think it's fine . Now I need to design a nice PCB, maybe add a little heatsink on my drivers (I have some very little heatsinks, will do the trick, just need to find out how to stick them correclty). And I need to fix that antenna issue as well. I'm going to try the current-sense tranformer.
10
« on: November 18, 2019, 09:19:26 PM »
i read the datasheet again and indeed there is something weird . Anyway, I'll try to add those capacitors ant try to seek for any parasitic oscillations. Hope this will fix all my problems . I have another little problem, concerning the feedback antenna. Well, when I use a 74hc14 hex inverter with Schmitt-trigger inputs, it doesn't work. The tesla coil won't work at all. I tried different cables for the antenna, no luck. But... with an old 4069 it actually works, and pretty good, but the antenna has to be close to the tesla coil, or it will stop working. Or is there a better way to make a consistant working antenna than an inverter chip ?
11
« on: November 17, 2019, 04:06:01 PM »
Ok, thank you for all those tips. I'm connecting the input pin of the 7805 regulator directly on the Power supply out instead of the output pin of the 7812, does it make any difference ? I also added some 0.1µf in parallel of C9, C10 and C11, is that ok ? For C4 and C5 I'm also using 0.1µf, is this ok, or should I use higher capacity and specific cap technology ? I'll try to add more, 1 between pin 1/4 and 1 between pin 5/8, as close as possible of the chip. And yes, haven't seen the voltage divider caused by C6. That may explain why I have barely +8V peak at the input of my GDT. But it means that my drivers will heat even more, right ? I'll try to input a square signal with around 30% duty cycle in the enable pin of my drivers, hope it will reduce the heat. I can only make a single layer circuit, but I'll try to have a "big" ground plane at the ground pin of the drivers to help cooling them, as well as a fan on the top of the circuit.
12
« on: November 16, 2019, 09:20:41 PM »
Oh, first, thanks you soo much for helping me everybody . Then, according to the GDT troubleshoot web site i'm in the "Massively overdamped gate drive waveform" case. Before using 47 Ohm resistors I tried with 10 Ohm resistors and I got something similar to "The perfect gate drive waveform!" with a very little overshoot, but with a even lower peak voltage and my drivers where heating even more. The core i'm using has an Al of about 4700. I might have some ferrite core laying around, the anti parasitic ones (grey, looks like carbon). Should I use one of them ? Yes, I'm using quite long cables to connect my IGBTs to my transformer. What do you mean by "not coated" GDT ? The leakage inductance is quite low (about 0.8 µH, I shorted all the secondaries and plugged the primary in a (quite accurate) RLC meter). So for my circuit I should try to make all my connections as short as possible ? Oh, and I'm not using any DC Blocking Capacitor in serie with my tesla coil. I'll add one later.
13
« on: November 16, 2019, 07:27:30 PM »
The circuit part with the drivers are on a breadboard, I know those things has a lot of parasitic capacitance, but I don't know about parasitic inductance. I was about to design a real circuit for this, but wanted to fix that heating problem before. Yes, my IGBTs are heating quite a bit too. Is it something common to use a little heatsink on the driver chips ? I also planned to add a bigger capacitor on the top of my tesla coil, to reduce the resonance frequency. Is 220kHz a high frequency for a SSTC ? And do you have any tips for my circuit design to avoid those parasitic inductance ? Is it a good idea to power my circuit through a 7812 regulator? Or it add even more potential parasitic oscillations ? I'm using an old CRT scope for my tests. It can't measure a frequency as high as 30MHz.
14
« on: November 16, 2019, 01:33:17 PM »
Ok, thanks you for all those information. I'm using 47 Ohm gate resistors, but discharge time is way too high (and charge time too). But if I lower them to, let say, 10-15 Ohm like everybody does, will my drivers heat even more ? And why full bridge SSTC shematics aren't that commmon ? Primary voltage amplitude is twice as high than with a half bridge right ? Or maybe it's too hard to drive, and lead to problems like mines.
15
« on: November 16, 2019, 01:21:10 AM »
I'm using some UF4007 as freewheeling diode, is that ok ? I plan to play music with it, so yes, the average duty cycle will be 50% so the power needed will be half of that, but still, I tried and the drivers get hot pretty fast. I saw some people using a gate resistor per MOSFET/IGBT on the secondary of the GDT, and some people using one resistor at the primary. Does it make any difference ? I think I'll go for 2 GDTs, each drived by a pair of UCC27321/27322. I can't check my 12Vdc supply for now.
16
« on: November 14, 2019, 05:40:58 PM »
Hello, I'm creating my first SSTC for some school project. However, I have some troubles : I want to use a full H-bridge. I got some IXGH40N60A IGBTs. I also got some UCC27321 and UCC27322 to drive them (isn't that the most used driver ?) For the tests I use a 555 timer that creates a 220kHz square signal with 50% duty cycle (that's about the resonant frequency of my tesla coil), that will be replaced by an antenna later. The 555 timer is powered by a 7805 regulator, and the drivers are powered by a 7812 regulator, pluged on a variable power supply. Everything is plugged like this schematic found on instructables : https://www.instructables.com/id/Building-a-solid-state-tesla-coil/Except i'm not using a 555 to modulate my tesla coil, I plug the pin 3 of my drivers to +5V (for now). When I scope between the 2 outputs of my drivers I got a nice square wave signal, going from +12V to -12V, 50% duty cycle, at 220kHz, so everything is OK, working fine for now. Time to make a gate driving tranformer. 1 primary coil for 4 secondary coils. ratio 1:1. My transformer core is kinda big, but it has an Al=4700 approximately. When I plug the primary of my transformer to the output of my drivers (with a 100nF capacitor in serie, like the schematic) and scope one of the secondary, I still have my nice square wave signal, from +12V to -12V. But when I plug all my IGBTs... the signal voltage at the primary of my transformer drops from +12V/-12V to barely +7V/-7V as you can see on the first picture, and my drivers starts heating (there is some ringing as well, but it's due to my oscilloscope, didn't had them with a numeric one with a different probe). I'm using 47 ohm gate resistors. On the 2nd picture i'm probing Vge of my IGBTs... again, barely +7V/-7V "square" wave, probably because of too high gate resistors value. I tried to reduce the amount of turns in my transformer, with no luck. What should I do ? It will end up killing my drivers, they are heating quite a bit. BUT... the tesla coil actually works, I can replace the 555 by an antenna, I can get some nice electric arcs (also works with the 555 timer but it's not tuned correctly). But, why are my UCC27321/UCC27322 heating that much ? Why is the voltage droping that much ? Can those drivers handle a full H-bridge ?
17
« on: November 14, 2019, 05:13:01 PM »
Hi High voltage members ! I'm babass, 21 years old French guy who wants to make a SSTC with a full H-Bridge IGBT, but has some problems with that I'll explain in another topic. That's will be my first tesla coil.
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[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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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 09, 2024, 03:27:11 AM
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Re: Big Coil Big Sparks
[Dual Resonant Solid State Tesla coils (DRSSTC)]
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davekni April 09, 2024, 03:25:47 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 09, 2024, 03:01:40 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 09, 2024, 02:46:46 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 08, 2024, 09:32:57 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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OmGigaTron April 08, 2024, 09:25:11 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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alan sailer April 08, 2024, 08:45:15 PM
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