Another good source of capacitors are induction heater capacitors they work really well I tried running my zvs driver on 48V and the capacitors only got slightly warm (28A current draw) Also i found out that using 330ohm resistors reduces the mosfet temperature by a lot
Nice, capacitors from induction heaters are great, since they are rated for the high tank currents. I might try to also reduce the resistance to 330 ohm. Ig it was better in your case because it drove the gates better.
Thanks for sharing. Ive always used 460 5w and they can get hot enough to melt close by insulation etc. im going to sswap out for 330s and see if that improves. I think i read on an hv forum vfor higher end of input voltage u can use 680s, so surprised 330 is heating less. Yes, best free caps ive found yet are from induction cooktops, high frequency, 900vdc, and usually good brandname ones, epcos etc.
Nice work. The single choke version always seemed to run better for some reason. I made a hybrid setup will both choke coils on a giant ferrite ring and that's been working out for me.
Those 10k resistors play a minor role in the circuit. They are there just to allow the MOSFET gates to be fully discharged to zero because those diodes can only bring them down to one forward-bias diode voltage.
I built mine by just following your build and it works! The funny thing is, i built mine with some components that are more or less out of value and some that are completely different. And yet, it produces 30kv on the output. Pretty-pretty neat to say the least.
Nice to hear:D I also build this circuit with completely different, scrap components before and it also worked. The component values used are relatively flexible.
Very intresting,the zvs circuit I have bought on ebay maybe be different with the caps.they don't appear to be parallel resonant.i found same thing ,freq goes up by approx 12khz with arc.i found that to be undesirable for my use.i have to draw off schematic sometime.thanku for your video.
I don’t have a diagram, but I can tell you where you would expect what signal. across your primary and tank cap there should be a sinewave and on each drain there should be a halfwave 180 degree out of phase with the other drain. On the gate you have a squarewave and the halfwave voltage on the drain should be within that squarewave. Both drain voltages should ideally also be 180 degree out of phase with each other and there should be no point, where both gates are high. That would lead to cross conduction decreasing the efficiency and making your FETs hot. Hope this helps
Excuse me diode is not for discharge .10k is for discharge gate.diode is for charging negative side of capacitor because capacitor don't attached to ground.or maybe I mistake.if mistake then 10k resistor is for nothing.
Hi thank you for your fine explanation, I built the same circuit with different mosfets It draws about 10A in ideal conditions is that normal?? It has no secondary coil I was aiming for an indicator.. Can you confirm if it is normal? Any way to limit the current??
It looks like the capacitors are warm, I think the circuit is not running in ideal mode. The main coil is also warming It’s 6 turns of 2.5 mm single copper wire. Does this sound normal? Any idea how to check this?
that’s a good question, but I think the operating frequency can be determined by the capacitance of the tank cap and the inductance of the entire primary.
the baking soda is similar to salt when arcing. The sodium ions inside make the arcs bright, yellow and longer. Baking soda is better in my opinion, because it decomposes into safe co2 and salt into toxic chlorine during arcing.
yeah, I also think it is quite impressive what powers you can push trough that ferrite core. Also the transformer didn’t even get too hot during this, just a bit warm.
Can you figure proper formula for capacitor current with AC reactance ohms, inductance of primary, capacitor mfd, + frequency. + charge point of Period waveform peak?
Sorry for taking so long to get back to you. I haven’t messed with modulated ZVS drivers yet, so I can’t really recommend much. But I have seen people inject an audio signal into the limiting inductor or you could try modulating the gates. This is example of modulation via the limiting inductor ruclips.net/video/CHlqc4q6NKM/видео.html
So cool , thanks so much for sharing your knowledge 🙌 I been wanting to make this circuit so long , do you think I could use the flyback to charge capacitors , I seen zvs capacitor charger circuits but I do not want to rewind a ferrite core , can I use a flyback ? Since I think it produce dc current , I would like to charge caps to about 200v quickly
@G E T R E K T thanks so much that helps a lot , I still need to get me flyback and some nice transistors , I was thinking about using igbt instead of mosfets
As I said in the video the oscillating frequency is determined by the parameters of the LC circuit formed between the black tank caps and the primary of your transformer.
the screw and the back of the fet are isolated, I may have even used a rubber bushing to isolate it further, as it would be done on metal to-220 package transistors. That isolation is very important and the circuit will not work or even destroy itself if the back of the transistors touch.
well, you cant drive a slayer exciter with a ZVS, but you can drive a teslacoil with a ZVS if you tune the tank caps in the ZVS properly. Here is an example of that: ruclips.net/video/nm54wlm5Bw8/видео.html
Does the inductor needs to be a toroid one ? Or can I use one of those ferrite chokes (the ones that are like a little bar with the wire around them , cause I have a few of those rated 200 (wich I guess is 200mh ) , I also have a ferrite toroid but I don't know the amount of turns it needs to get around 200mh
You want more like 100-200 uH, not mH. It would be impossible to get that much inductance with wire large enough to handle the current anyways. The ferrite bobbin style chokes you mention are probably close to the right inductance but they may lack a high enough current rating. You need like 20 AWG wire minimum for continuous duty.
yes, the operating frequency is dependent on the inductance of the primary and the tank capacitor. Since the primary inductance changes with an arc the frequency also changes
Yes, but the centre tapped coil has to have the same inductance in both parts of the coil. The circuit works with non-symmetrical coils but it isn’t ideal and might cause problems
I built a couple of ZVS circuits and I keep getting into a trouble where my mosfets/Igbts latch on and the circuit keeps blowing up Usually happens because of overloading at around 12v 5-6 amps
that also happend to me at 40V input (here: ruclips.net/video/e-0v0AuUJUE/видео.html), but I can't explain how to fix it, it might have something to do with the choke tho. At least in my case it was a bit to small and probably contributed or caused the failure at the end.
Did you ever get it figured out? These bad boys can pull 15-20 amps. So if the voltage drops below 12volts on your power supply, the mosfets will have a hard time. Igbts are even worse. They need about 15 volts. Try 20 volts bro.
The choke will limit the current only if it is switching back and forth. In case some transistor gets stuck the choke will ultimately allow a full current flow and things will get really hot. Maybe to test the circuit use a resistor instead of (or in series to) a coil could help not to fry things too early.
#!#!Why not use IRF3205 MOSFET that has on resistance of only .008 ohms with 80-110amps? No heating, no fan, and probably no heat sink. These transistors are used in the popular highly efficient 20khz China 500W Inverter open board...,,??//?
That would be a good idea, but the IRF3205 is just rated for a drain source voltage of 55v and the resonant voltage in the tank circuit can easily reach over 100v. The IRFP260 would be better tho as it has half the resistance of the IRFP250, is rated at 200v and can handle up to 50A.
It can, I have tried it. The issue is not so much overvoltage on the magnetron -- they're pretty rugged, but overcurrent crashing the output voltage since they are designed to draw up to 0.5A. You can reduce the current drawn by the magnetron by under-running the filament though. Modern microwaves have actually begun doing away with iron core xfmrs in favor of a beefy ass flybacks. It knocks about 15 pounds off the weight and it's cheaper to manufacture as well.
Another good source of capacitors are induction heater capacitors they work really well
I tried running my zvs driver on 48V and the capacitors only got slightly warm (28A current draw)
Also i found out that using 330ohm resistors reduces the mosfet temperature by a lot
Nice, capacitors from induction heaters are great, since they are rated for the high tank currents.
I might try to also reduce the resistance to 330 ohm. Ig it was better in your case because it drove the gates better.
@@sciencebysergio yess im using 330 ohm 10w resistors. At first i used 2W resistors but they got burned at 48V
Thanks for sharing. Ive always used 460 5w and they can get hot enough to melt close by insulation etc. im going to sswap out for 330s and see if that improves. I think i read on an hv forum vfor higher end of input voltage u can use 680s, so surprised 330 is heating less.
Yes, best free caps ive found yet are from induction cooktops, high frequency, 900vdc, and usually good brandname ones, epcos etc.
Nice work. The single choke version always seemed to run better for some reason. I made a hybrid setup will both choke coils on a giant ferrite ring and that's been working out for me.
Thx:)
The single choke design is also more efficient from what I have heard.
Also interesting that both windings on the same core worked for you.
Those 10k resistors play a minor role in the circuit. They are there just to allow the MOSFET gates to be fully discharged to zero because those diodes can only bring them down to one forward-bias diode voltage.
Correct....though I'm not sure that is minor
Worth noting that this circuit is based on the Baxandall converter, which is in turn influenced by the Royer oscillator.
dude, awesome explanation!
I built mine by just following your build and it works! The funny thing is, i built mine with some components that are more or less out of value and some that are completely different. And yet, it produces 30kv on the output. Pretty-pretty neat to say the least.
Nice to hear:D
I also build this circuit with completely different, scrap components before and it also worked. The component values used are relatively flexible.
I have the same flyback, Nice output
Thank you! I finally understand how it works.
Very intresting,the zvs circuit I have bought on ebay maybe be different with the caps.they don't appear to be parallel resonant.i found same thing ,freq goes up by approx 12khz with arc.i found that to be undesirable for my use.i have to draw off schematic sometime.thanku for your video.
The ZVS drivers from china are probably exactly the same as what I have here, so it makes sense that they perform similar.
Well rounded
Men like it that way.
Nice presentation! Can you provide a quick diagram of where you placed the Oscope leads? I'm so glad I found this channel!
I don’t have a diagram, but I can tell you where you would expect what signal.
across your primary and tank cap there should be a sinewave and on each drain there should be a halfwave 180 degree out of phase with the other drain.
On the gate you have a squarewave and the halfwave voltage on the drain should be within that squarewave. Both drain voltages should ideally also be 180 degree out of phase with each other and there should be no point, where both gates are high. That would lead to cross conduction decreasing the efficiency and making your FETs hot.
Hope this helps
@@sciencebysergio this helps alot! thank you so much! again, nice presentation!
It can use as induction heater
yes, but then it might be better to use the variant with no center-tap
Excuse me diode is not for discharge .10k is for discharge gate.diode is for charging negative side of capacitor because capacitor don't attached to ground.or maybe I mistake.if mistake then 10k resistor is for nothing.
И за большого входного напряжения выходят из стороя mosfet транзисторы. Надо ставить высоковольтные mosfet и бороться с выбросами на стоке- исток.
Hi thank you for your fine explanation, I built the same circuit with different mosfets
It draws about 10A in ideal conditions is that normal??
It has no secondary coil
I was aiming for an indicator..
Can you confirm if it is normal?
Any way to limit the current??
No, that is not normal. Is anything getting hot?
Maybe you are heating the core itself or you are getting cross conduction of the mosfets.
It looks like the capacitors are warm, I think the circuit is not running in ideal mode.
The main coil is also warming
It’s 6 turns of 2.5 mm single copper wire.
Does this sound normal?
Any idea how to check this?
----If the capacitor is across the whole primary, and switching only uses 1/2 primary, how do we figure the frequency??//////?
that’s a good question, but I think the operating frequency can be determined by the capacitance of the tank cap and the inductance of the entire primary.
I can't find anything about baking soda arcs online, can you please provide more information?
the baking soda is similar to salt when arcing. The sodium ions inside make the arcs bright, yellow and longer.
Baking soda is better in my opinion, because it decomposes into safe co2 and salt into toxic chlorine during arcing.
@@sciencebysergio thank you
I am surprised that the TV DST is able to deliver so much power as in a TV set it only has to handle a fraction of it.
yeah, I also think it is quite impressive what powers you can push trough that ferrite core.
Also the transformer didn’t even get too hot during this, just a bit warm.
Can you figure proper formula for capacitor current with AC reactance ohms, inductance of primary, capacitor mfd, + frequency. + charge point of Period waveform peak?
I unfortunately dont understand what you mean.
Pregunta, sonará algo estúpido pero el circuito lo alimentas con corriente continua o alterna?
I feed it direct current from a 28V 16A DC switching psu
can i solder two 12v 0,5w zener diodes? will it do the job?
yeah, should probably be fine
Great job. Please help us. This driver works only mosfet or It will work with NPN bipolar transistors too?
I think it should only work with MOSFET’s or IGBT‘s
Neat :)
Please, could you suggest a simple circuit to modulate the ZVS Flyback output with an audio signal ?
Sorry for taking so long to get back to you.
I haven’t messed with modulated ZVS drivers yet, so I can’t really recommend much. But I have seen people inject an audio signal into the limiting inductor or you could try modulating the gates.
This is example of modulation via the limiting inductor ruclips.net/video/CHlqc4q6NKM/видео.html
excelente amigo
May I ask can we limit the power to 100W while still have the similar voltage?
You could maybe regulate the average input power using PWM.
So cool , thanks so much for sharing your knowledge 🙌 I been wanting to make this circuit so long , do you think I could use the flyback to charge capacitors , I seen zvs capacitor charger circuits but I do not want to rewind a ferrite core , can I use a flyback ? Since I think it produce dc current , I would like to charge caps to about 200v quickly
That would probably work, but the risk of severely overcharging the capacitor is quite high. Thus I would rewind the flyback.
@G E T R E K T thanks so much that helps a lot , I still need to get me flyback and some nice transistors , I was thinking about using igbt instead of mosfets
I thought that the frquency was determined by an LC circuit created between the inductor (choke) and the capacitor?
No, that isn’t the case. The choke is just to limit inrush current to the mosfets.
@@sciencebysergio so what determines the frequency, please?
As I said in the video the oscillating frequency is determined by the parameters of the LC circuit formed between the black tank caps and the primary of your transformer.
@@sciencebysergio Thanks for confirming
Nice ZVS driver m8
Thanks:D
I might try running it at a higher voltage in the future.
How powerful is it？Can it be used for self defense？
@@user-wy3ng5hs3i totally bro...
@@HoorGuvLabs Thank you for your reply, How powerful is it？Can you describe it?
@@user-wy3ng5hs3i its like so powerful bro
What's the point of the thermal isolation pad on the mosfet when both are mounted to the heatsink with a screw?
the screw and the back of the fet are isolated, I may have even used a rubber bushing to isolate it further, as it would be done on metal to-220 package transistors.
That isolation is very important and the circuit will not work or even destroy itself if the back of the transistors touch.
@@sciencebysergio hey thank you very much for your response!
Maybe my question is a non-sense but It is possible to drive a Slayer exciter Tesla coil with a high frequency ZVS?
well, you cant drive a slayer exciter with a ZVS, but you can drive a teslacoil with a ZVS if you tune the tank caps in the ZVS properly. Here is an example of that: ruclips.net/video/nm54wlm5Bw8/видео.html
@@sciencebysergio thanks!
can i use single direction tvs instead of zener? i cant find two 12v zeners at the monent.
yes, that might be even better.
Does the inductor needs to be a toroid one ? Or can I use one of those ferrite chokes (the ones that are like a little bar with the wire around them , cause I have a few of those rated 200 (wich I guess is 200mh ) , I also have a ferrite toroid but I don't know the amount of turns it needs to get around 200mh
any kind of inductor with the correct parameters should work, just make sure it os rated for the current.
You want more like 100-200 uH, not mH. It would be impossible to get that much inductance with wire large enough to handle the current anyways. The ferrite bobbin style chokes you mention are probably close to the right inductance but they may lack a high enough current rating. You need like 20 AWG wire minimum for continuous duty.
Maybe you know I've heard that zvs self resonates with the load is this true.like maybe with a Tesla coil .
It seems to in your video the frequency moving with the stretching of the ark.
yes, the operating frequency is dependent on the inductance of the primary and the tank capacitor. Since the primary inductance changes with an arc the frequency also changes
@@sciencebysergio think you it's not said enough
Tesla coil circuit operates based on feedback from the secondary winding and zvs driver oscillates based on feedback from the primary winding.
Can i use this circuit as induction heater?
Yes, but the centre tapped coil has to have the same inductance in both parts of the coil.
The circuit works with non-symmetrical coils but it isn’t ideal and might cause problems
Is the output voltage from the transformer AC or DC?
In my case it is DC but there are also flyback transformers with an AC output.
I built a couple of ZVS circuits and I keep getting into a trouble where my mosfets/Igbts latch on and the circuit keeps blowing up
Usually happens because of overloading at around 12v 5-6 amps
that also happend to me at 40V input (here: ruclips.net/video/e-0v0AuUJUE/видео.html), but I can't explain how to fix it, it might have something to do with the choke tho. At least in my case it was a bit to small and probably contributed or caused the failure at the end.
The choke limits the current
Did you ever get it figured out? These bad boys can pull 15-20 amps. So if the voltage drops below 12volts on your power supply, the mosfets will have a hard time. Igbts are even worse. They need about 15 volts. Try 20 volts bro.
The choke will limit the current only if it is switching back and forth. In case some transistor gets stuck the choke will ultimately allow a full current flow and things will get really hot. Maybe to test the circuit use a resistor instead of (or in series to) a coil could help not to fry things too early.
#!#!Why not use IRF3205 MOSFET that has on resistance of only .008 ohms with 80-110amps? No heating, no fan, and probably no heat sink. These transistors are used in the popular highly efficient 20khz China 500W Inverter open board...,,??//?
That would be a good idea, but the IRF3205 is just rated for a drain source voltage of 55v and the resonant voltage in the tank circuit can easily reach over 100v.
The IRFP260 would be better tho as it has half the resistance of the IRFP250, is rated at 200v and can handle up to 50A.
I sugest irfb4110
Why don't you try to feed the gates with a separate power supply
I could, but this version of the circuit works for me so why make it more complicated:)
@@sciencebysergio it's not that complex, just put the positive 12v to the gates and the Negative to Negative of 24v supply, it works more efficiently
@@ElIsraelJijijiji True, I might try it when I run the ZVS at a higher input voltage.
@@ElIsraelJijijiji where’s the second power supply coming in?
@@herobrine1847 between MOSFETs gates and ground or negative
Do you think it could power a magnetron?
maybe, but it might damage it from overvoltage.
It can, I have tried it. The issue is not so much overvoltage on the magnetron -- they're pretty rugged, but overcurrent crashing the output voltage since they are designed to draw up to 0.5A. You can reduce the current drawn by the magnetron by under-running the filament though. Modern microwaves have actually begun doing away with iron core xfmrs in favor of a beefy ass flybacks. It knocks about 15 pounds off the weight and it's cheaper to manufacture as well.
Can i use Irfp 260?
yes, it is better than irfp250.
Yes it's much better and last longer than 250s
How powerful is it？Can it be used for self defense？
the power is around 300W with 28v input and it might be usable for self defence, but it isn't great for that.
Also stop the spamming please.
@@sciencebysergio Thank you for your reply. 300W is so powerful! And it's not spamming, I just want a correct answer.
Harris Elizabeth Jones George White Charles
Transistor 😂 mosfet
I mean in the end it’s the same thing ¯\_(ツ)_/¯
Yup mosFET (field effect transistor)
Your circuit unclear i not see. Baste video
What do you don’t understand about the circuit?
Your message you’re trying to convey is not clear as well, are you saying “bad video”
lecroy
ZVS. MEANIING ZERIES' 2 MOSFET ON THE SAME TIME PARALEL...
Not really, ZVS stands for Zero Voltage Switching and refers much more to a concept and not actually this circuit