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Messages - MarcusFunt
1
« on: January 14, 2023, 05:19:44 PM »
The way I built it is pretty much exactly the same but with irfp460 MOSFETs. With FETs instead of IGBTs, I'd recommend using a 1:1 GDT. Can be made with much lower leakage inductance (by winding with two twisted pairs and paralleling one wire of each pair for primary). Also reduces load on driver chip.
Another main difference is that I got impatient with the whole ground plane thing and just connected the base of the secondary directly to the antenna. I theorize that this might be the issue. I wonder if inverting the schmitt trigger might solve this and let me keep getting away with the direct secondary feedback. What do you think? Feedback from secondary bottom is used by other coils (including my SSTC). Secondary peak current is likely to be 1-2A. A bit high for 1N4148 diodes even at low duty cycles. Also can cause an issue of over-powering +5V supply. Diodes feed current to +5V, more than circuitry consumes. All designs I've seen using secondary feedback either use a current transformer (CT) or use high-power zener or TVS diodes to clamp voltage rather than clamping to +5V. (Additional lower-power clamp to +5V may exist after series resistor limits current.) If you decide to use a current transformer, clamping needs to be symmetric around 0V and/or AC-coupled before clamp. Otherwise DC component of voltage will saturate CT core.
Good grounding is still necessary. With secondary bottom feedback, grounding of logic supply negative rail becomes the most important. At least connected to line ground. Counterpoise is better.
Yes, polarity may need inverting when changing from antenna to secondary feedback. This can be done by swapping GDT primary wires or SSTC primary wires or by adding an inverter stage. You'll just need to try both polarities to see which works.
Adding bleed resistors across 0.82uF caps or across IGBTs can help with startup. Makes sure that initial state of half-bridge output is centered so that initial half-cycle will generate some feedback. A resistor across only one side can be better or worse depending on which IGBT turns on first, which is nondeterministic with this circuit. My favorite fix is to add a resistor from HC14 pin 2 to far side of 1k resistor (junction of 1k and 0.1uF). That keeps the HC14 toggling even when coil is off (between interrupter pulses). There are some other threads here discussing this change. Details for your case depend on what other changes you make first.
Good luck!
Wow, this all sounds like great advice. I can see why adding that resistor to the HC14's pin 2 is your favorite, it sounds brilliant and I don't know why I didn't think of that myself. I'll give all that a try, thanks.
use an antenna. Im pretty sure that will solve your problem
2
« on: October 23, 2022, 07:42:24 PM »
Thank you for your help 👍
Should i just give it a test with the transistors and coil attached?
3
« on: October 23, 2022, 01:10:17 PM »
here is the output from the 74hc14
4
« on: October 23, 2022, 01:09:25 PM »
okay here is the input to the 74hc14 (I'm sorry for spamming, but I haven't figured out how to put in pictures)
5
« on: October 23, 2022, 12:53:19 PM »
Hi
I am starting to think that my board works fine because this is how the input signal looks. (I was probing where the antenna is supposed to be connected)
6
« on: October 22, 2022, 11:13:58 PM »
Hi I am experiencing some bizarre problems regarding my gate drivers I made a quick video, showing the problem with some waveforms. To clarify. My drivers gave me an asymmetrical ac voltage+the on-times are really uneven, I get weird oscillations on the primary of my gdt, and I get large voltage spikes at the output of the gdt. I tested the driver with 100khz even though I'm gonna run the coil at 350khz(I don't have a function generator, and the 555 wouldn't run stably on 350khz) I'm using the attached schematic for my coil. no changes whatsoever. Any help would be very much appreciated, I'm really stuck on this project
7
« on: October 11, 2022, 02:16:33 PM »
Hi. I'm building a tiny staccato ramped QCWDRSSTC. I calculated everything in javaTC and exported it as text:
J A V A T C version 13.6 - CONSOLIDATED OUTPUT 11.10.2022 14.09.07
Units = Centimeters Ambient Temp = 20ºC
---------------------------------------------------- Secondary Coil Inputs: ---------------------------------------------------- Current Profile = G.PROFILE_LINEAR 3.75 = Radius 1 3.75 = Radius 2 0 = Height 1 8 = Height 2 760 = Turns 0.01 (cm)= Wire Diameter
---------------------------------------------------- Primary Coil Inputs: ---------------------------------------------------- Round Primary Conductor 5 = Radius 1 5 = Radius 2 0 = Height 1 1.39 = Height 2 4.635 = Turns 0.1(16A Rated. Intalation cable) = Wire Diameter 0 = Ribbon Width 0 = Ribbon Thickness 0.05 = Primary Cap (uF) 0 = Total Lead Length 0 = Lead Diameter
---------------------------------------------------- Secondary Coil Outputs: ---------------------------------------------------- 363.13 [kHz] = Secondary Resonant Frequency 90 [deg °] = Angle of Secondary 8 [cm] = Length of Winding 95 [cm] = Turns Per Unit 0.00526 [mm] = Space Between Turns (edge to edge) 179.07 [m] = Length of Wire 1.07 [:1] = H/D Aspect Ratio 389.88 [Ohms] = DC Resistance 65908 [Ohms] = Reactance at Resonance 0.013 [ kg] = Weight of Wire 28.886 [mH] = Les-Effective Series Inductance 29.057 [mH] = Lee-Equivalent Energy Inductance 28.127 [mH] = Ldc-Low Frequency Inductance 6.65 [pF] = Ces-Effective Shunt Capacitance 6.611 [pF] = Cee-Equivalent Energy Capacitance 12.131 [pF] = Cdc-Low Frequency Capacitance 0.1195 [mm] = Skin Depth 4.61 [pF] = Topload Effective Capacitance 756.6971 [Ohms] = Effective AC Resistance 87 [Q] = Quality Factor
---------------------------------------------------- Primary Coil Outputs: ---------------------------------------------------- 363.14 [kHz] = Primary Resonant Frequency 0 [%] = Percent Detuned 90 [deg °] = Angle of Primary 145.61 [cm] = Length of Wire 31.96 [mOhms] = DC Resistance 0.2 [cm] = Average spacing between turns (edge to edge) 1.195 [ cm] = Proximity between coils 0 [cm] = Recommended minimum proximity between coils 3.858 [µH] = Ldc-Low Frequency Inductance 0.05001 [µF] = Cap size needed with Primary L (reference) 0 [µH] = Lead Length Inductance 124.27 [µH] = Lm-Mutual Inductance 0.377 [k] = Coupling Coefficient 0.126 [k] = Recommended Coupling Coefficient 2.65 [half cycles] = Number of half cycles for energy transfer at K 3.32 [µs] = Time for total energy transfer
---------------------------------------------------- Top Load Inputs: ---------------------------------------------------- Toroid #1: minor=2, major=14.3, height=11, topload
Am i missing something obvious?
8
« on: August 22, 2022, 04:58:10 PM »
BTW, is there any reason for the ZVS oscillator to remain on after fan turns off? I'm just wondering, depending on how your device is intended to be used.
Yes. The fan should stay off for a few seconds after the zvs turns on, then stay on for a few seconds after the zvs are turned off(I don't the best way to do that is with 2 555's. If you know a better way to do it, Please educate me ) it is to allow the ozone to build up a bit first before it sends it through a filter
9
« on: August 22, 2022, 04:49:05 PM »
A few recommendations:
ICs generally need bypass capacitors from power to ground.
Switching IC power directly from another IC output is problematic once bypass capacitors are added. No need for such. The reset pin is sufficient for your logic needs.
Not sure if there are any convenient NE555 models for LTSpice. However, I suggest simulating at least the power switch (Q3) using a stepped voltage source to simulate output of U5. Look at NE555 specifications to see the output Voh level, typically about 1.3V below VCC. Use that voltage for stepped voltage source.
BTW, is there any reason for the ZVS oscillator to remain on after fan turns off? I'm just wondering, depending on how your device is intended to be used.
I simulated both the entire zvs circuit and the fan controller in LTSpice, and everything worked as it should. the 555 can output 200ma, so it should be more than enough to drive both the other 555 and the MOSFET. I am considering adding a push-pull amp to Q3 though or maybe a dedicated driver ic and signaling into that via the 555.
10
« on: August 21, 2022, 08:06:47 PM »
I am done with the first version of my schematic. It would be great if someone would go through it and tell me if I did something wrong
11
« on: August 20, 2022, 10:09:26 PM »
I designed a NE555-based circuit that eliminates all the startup problems Sounds interesting.
Something weird I noticed though. Why is the voltage of the blue waveform so much higher? No way to know without seeing circuit and a zoomed-in view of final higher-voltage oscillation plot.
I thought the rise at the end was weird so I ran it again and got the exact same result but without the bump. It was just some weird anomaly. I am designing the final schematic tomorrow and will post it here. It would be really nice if you would take a look at it, and tell me if I did something weird/stupid .
12
« on: August 20, 2022, 09:18:31 PM »
Could an RC Time circuit and MOSFET get the job done? Probably could work. Try it in simulation.
I designed a NE555-based circuit that eliminates all the startup problems Green=before Blue=after Something weird I noticed though. Why is the voltage of the blue waveform so much higher?
13
« on: August 20, 2022, 07:46:36 PM »
Hi If you center-tap the transformer primary, the two 50uH inductors can be replaced with one smaller inductor from center-tap to 12V supply.
I know, but it is simpler to measure and troubleshoot.
Do you have the option to turn on the 12V supply to gate resistors (460 ohms in your schematic) before power to inductors? Yes, but it would have to be done automatically and quickly. Could an RC Time circuit and MOSFET get the job done?
460 ohms seems high for 12V input. Is that copied from higher-voltage units? At 12V, lower resistance will provide enough current for fast FET switching. I'd try ~100 ohms. Will still be under 1W each during operation. I have used 460 ohms before, all the way from 16 to 36 volts input. I will probably change it to a lower value. 470 does seem like a lot.
Thanks
14
« on: August 20, 2022, 03:28:44 PM »
My input voltage will be 12vdc from a commercial smps. but the voltage across the MOSFET is dependent on the resonant circuit formed by the primary coil and resonant capacitor. the resonant voltages and current are calculated by LTSPICE: 17A peak. 42vac peak. I will at max be drawing a few milliamps from the transformer. The MOSFETs will however only pass around 10A max. The gates will be getting 12v protected by Zener's and flyback diodes(probably not necessary) the inductance of my primary is going to be around 3-6microheny(very vague I know)
16
« on: August 11, 2022, 06:54:14 PM »
As far as I know you will need to change the number of turns on either the primary coil or the secondary coil to change the resonant frequency. Changing the primary circuit capacitance is also an option but that is usually impractical. Another factor that you may consider modeling in JAVATC is maximum streamer length. A streamer adds capacitance and thus changes the resonant frequency. JAVATC gives you the ability to model several top loads simultaneously thus you can model the streamer as a very tall and thin cylindrical top load on top of the main top load.
You definitely will need a top load for several reasons. The main reason is to add capacitance to the secondary circuit. Another important reason is to do EM field-shaping. Proper field-shaping is essential to prevent sparks and corona from emanating from the top turns of the secondary coil.
Thank you for the javatc tip. Is it possible running the secondary at a nodal frequency.(secondary at 225khz and primary at 450khz?)
17
« on: August 11, 2022, 10:03:54 AM »
Hi I am building a relatively large SGTC and made a stupid mistake while calculating the resonant frequency. I stupidly forgot to add the topload to javatc, and calculated the whole thing as if the top load didn't exist. Is there a way to raise the secondary's resonant frequency enough to add a small top load? I could of course just add some more primary turns, but I spend a lot of time making a good-looking primary and would like it to stay as it is now. I'm feeding the coil 2.1 kw Is it possible matching the primary and secondary frequency without adding more than a few primary turns or changing my(too small I know) capacitor? Do I even need the top load in the first place? All help would be much appreciated!
18
« on: July 22, 2022, 09:20:32 PM »
i have never seen smaller mains frequency transformers hv than yours, but the small ones in an electric bugzapper are sometimes made of iron
19
« on: June 10, 2022, 09:41:02 AM »
I am thinking of making a dual mot sgtc, and therefore i need capacitors. MOTs are particularly dangerous: Enough voltage to arc through clothing with current capability several times lethal threshold. NSTs are much safer, generally limited to 60mA or less, so much less likely to be lethal if you make a single mistake. I have a dual-MOT SRSGTC, but rarely set it up because I'm too afraid of making a mistake.
I am aiming for slower arcs of around 150 bms. So my max capacitance becomes 95nf. That is rather low power for two MOTs. 6kV on 95nF is 1.71J, or 257 watts at 150 BPS. Two MOTs are capable of 2kW (or more for intermittent use). My coil runs at 120 BPS with ~700nF and resonant charging to 9kV. Of course, if you have two MOTs in hand, that's cheaper than purchasing anything safer for 257 watts.
Your first link to 0.33uF 1200Vdc induction cooker capacitors looks like roughly the same parts I use in my DRSSTC and have ran some destructive testing to 2100Vpk (4200Vpp) at 80kHz 1% duty cycle. Your third link labeled "VERY CHEAP" would require 4 times as many parts for the same final Vdc rating and capacitance, since they are only 630Vdc rated. Would likely work fine, though I have no experience with these.
Have fun, and experiment safely!
I only felt safe enough to build it because a am doing it with two friends. I think of using the cheap caps because I can distribute the load across 80( or so) caps.
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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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