Mini Induction Heater
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- čas přidán 30. 06. 2024
- This video shows how I build a ZVS driver to power a small induction heater than can make pieces of metal weighing ~1 gram or less glow red hot. The circuit takes in 10-16V and the final variant shown in this video oscillates at about 160 kHz. I also show how this circuit can be used to drive a flyback transformer.
This is a very modestly powered circuit, but the advantage of a ZVS driver is that it can be scaled up to tens of kW without much of a problem. The voltage on the coil (and the MOSFET V-DS) is about 3 times the input voltage, so to use higher voltages of say, 36 or 48V, I would need MOSFETs rated for a higher V-DS like an IRF250 or IRF460.
NOTE: My statement about inductance not changing is inaccurate. Inserting a ferromagnetic object into the coil *does- increase the inductance and reduce the frequency.
Hardware used:
IRF44 Mosfet
1N4148 Diode
5.6V Zener Diodes
400 Ohm Gate Resistor
10k Gate pulldown resistor
1 uF 630V Polypropylene film capacitor
Music:
Kevin MacLeod - George Street Shuffle
Serge Pavkin - Fractal
This video was uploaded 2 years ago, i cannot find any batter videos then this on how to built a zvs circuit. This is a perfect video, even it beats electroboom induction heater video.
This video has everything.
Use MKP capacitors not MKS, MKP are meant for pulsed operations and is the ones I used over 10 years ago in mine and worked perfect with no overheating.
Just increase the capacitance by adding more capactiors in parallel, it will solve the problem
@@devilssongs530 No, their internal resistance at high frequency will make them all overheat at the same time and blow up.
@@dtiydr hey,
I have just made a zvs driver circuit using the diagram provide by this video, i applied 12 volts but it isn't working.
Can you please help me fix it ?
@@devilssongs530 I think I made mine after this schematic that is a little simpler, the one in the video is a little better but try this one and see if that works better: "eecs.blog/wp-content/uploads/2020/01/zvs-flyback-driver-schematic-768x566.jpg?ezimgfmt=ng:webp/ngcb2"
A cap's ESR is going to influence, but some unpolarized caps, by design, must be used in a polarized mode only, e.g.: spikes going only one direction, not both! It sounds awkward but it's RTFM.
He has a way of explaining things in his videos, you can't help but understand - hence learn it.
Interestingly, at high frequencies an aluminium wire would only have about 26% higher resistance than copper (with a cable of radius approaching infinity), rather than the regular 58% as the skin depth of aluminium is higher than that of copper. The skin depth of copper at 100kHz is about 0.2 mm, whereas that of aluminium is about 0.25 mm. The radius of the 20 AWG wire is about 0.4 mm and 10 AWG is about 1.3 mm, so the skin effect is quite significant at these frequencies (the skin depth is the depth at which the current density reaches 1/e, approximately the thickness of pipe at DC the cable is equivalent to for large diameters).
You might as well always keep your scope probes in 10X mode, that way they have much higher bandwidth
I’m so happy you showed building this in steps and I can tell more about it when you do this
Amazing.Electricity is the closest thing we have to magic.
Brilliant video. Thank you.
Try putting the heated metal closer to the heater coils rather than in the center...I have not tried this, but the magnetic field of a solenoid is maximum NEAREST the inside edge of the coil.
I hope someone tries this and comments on the results!!
GREAT VIDEO!!!!!
I've seen these with a much smaller diameter of the coil which would be closer but I don't know if that helps or not. Usually the coil has no insulation.
ths is neat. i`ve seen a few videos about this, but none with a buiild that looks as doable as this. since it`s two years old and you mentionned some potential changes, is there an updated version, a new build sheet, that we should try out? thanks!
Nice video! But don't use MKS caps. They have too high dielectric losses and will cook themselves like you showed. You need MKP or even better FKP capacitors that have low dielectric losses.
Pouring water onto your table with high current and voltage around is wild
I deal with old school Vacuum Tubes....this appears in schematic as a Long Tail Pair Phase Inverter circuitry to drive a Class AB Push Pull power tube amplifier system and thus the output transformer & possible feedback loop back to the input of the PI. I'll have to look at my scrap parts and see if I have a toroidal coil around to salvage out and brew up a Vacuum Tube Cooker
On your comment about adding metal changing the inductance of the coil, I'm a bit torn. It's true the frequency of the signal doesn't change, but we do see a phase shift. I suspect the metal has to be changing the inductance of the output coil, but that's probably not changing the inductance of the resonant circuit (since that's separate, based on the circuit diagram?). The different load inductance just changes the phase of the output, causing it to slide across.
You could check this by comparing a soft iron to stainless steel. The soft iron should change the phase more since it is more ferromagnetic.
I don’t remember if I’ve left a comment on CZcams before but this is only the 2 or 3 video of yours I watched and you are so fucking awesome I can actually absorb most of the information you’re putting out and if I can’t get it the first view I can rewatch til I understand which is true for most videos but I feel like you understand things at the very core of their concepts and the way you explain things idk forgive me rambling I have a tough time learning and you kinda made my month and maybe year! Your fucking Really awesome.
I LOVE THIS CHANNEL!!!!
Was part of melting the wire due to the nut having a hole in the center? Its eddy current would be going around in a circle and making a magnetic flux that would couple back into the coil?
Can you tell me if the mosfet unit is the most efficient type of induction heater ???? Also, was told that a low frequency that is used in the old General Electric company induction heaters was the most efficient and heated much deeper into the metal, is that true ???
Thank you for your time Sir.
Did you safe the Falstad circuit?
Could you add the (short) link to the simulation in the description text?
100 milliOhm resistors?
Would like to give this a shot as wel, for heating nuts and bolt on a vehicle.
Could it be run from a vihicle battery?
Nice and I have a question as you mentioned going up to 12KV.
Would it be possible to 'charge up' the inside of a sealed plastic tube formed into a torus with a negative ion charge by sticking a wire into it, sealing the entry point and running 12KV through the wire (like the negative ion emitter of an ion wind generator)?
If you can, would wrapping it in wire to make a toroid electromagnet out of the tube accelerate the negatively charged air inside (and maybe things that can be charged with static/negative charge that you also put inside like small metal bearings or plastic beads)?
Seems like that could be done. To make it work properly you'd need the inside lined with a conductor like aluminum foil/tape, so it might be a pain to build
@@HyperspacePirate Eh? No, I meant ionizing the air inside the torus with just a tiny carbon fiber brush that those small ionizers have and seal the hole you make to allow the brush part inside.
If you rub a balloon on fur or hair it can store a static charge on the surface so something similar with only the brush ionizing the air inside and then an electromagnet moving the charged air as if it was a plasma.
Ion wind drives are all about charging the air from a point source (eg. nail, tack, needle, etc.) and then streaming the ionized air to a neutral or positive ring. This would be that without the last part. You would not need to line the inside of the tube with anything.
Do you think that would work (as long as you don't let the brush allow the charge inside to drain out)?
@@curiousviewer5991 yeah that sounds like it would work as long as your negative lead was properly grounded. You could probably try it by bending some PEX or vinyl tubing into a ring to make your torus
@@HyperspacePirate Thanks. :) I'm thinking about just that but since you look much more experienced with the high voltage material I wanted to pick your brain a bit. The ion wind material on CZcams is a little thin and I'm curious about it now. lol.
Already got some vinyl tubing (with thick walls for good insulation) and a number of ideas to try once I sloooowly get everything together.
@@curiousviewer5991 I'm doing my next video about generating high voltage off a battery input, and probably ion wind after that, because it's also usable for propulsion
Please do basic videos like resonance in lc tank
can I add some D-S snubbers capacitors to help damp the voltage spikes?? like 1nf or 10nf
nice
Shown at about timestamp 7:15 what are the total number of windings on each half of your center-tapped primary (I assume it is tapped in the center)? Is the secondary wound with 10 times the total number of primary windings, or just 10 times the number of windings from the center tap to one end?
In another video, it stated that the ratio was only from the center-tap to one end...I think this was determined to be incorrect.
THANKS AGAIN!
No the turns ratio is from end to end, no matter if your transformer has a centertap or if you are using the two inductors as in the first version.
More than enough heat for a absorption refrigerator ?
Does anyone know how to dial in the frequencies for certain metals? For example, if you wanted to create an induction heater for Iron, or Silver, you'd use a different Hertz. But any idea how to get those values to build optimized circuits for specific metals and alloys?
can you design one that runs on a 5.5v LI portable phone recharger? to say make a portable mico hiking (slow) cooker ...
Is the circuit sensitive to the length of wire (or number of coils) used in the heater coil?
Yes. The coils form an inductor, which works with the capacitor to form an oscillator. Similarly, if you add enough metal then the inductor will change. That's what he was talking about at 6:50. Just a screwdriver isn't enough to cause the effect.
What if i were to use 2
Cfl inductive chokes as the inductors that could do a lot of somthing?
hyperspace what u think about heating plastic extruder with induction?
Build a hollow smooth workpiece, and put your plastic filament through it. Should work, but the inner surface needs to be smooth so that it doesn't stick.
Is this an efficient method to turn 12VDC into 120VAC with the right tuning ?
120VAC? Yes. 60Hz? Maybe. It would require rather large capacitances and/or inductances to bring the frequency low enough.
Nice design I see it is your go to ZVS Driver, not sure where to get the capacitors could you give me a link of where you get them and also the mosphets as i don't want to buy ripoff versions thanks
I get almost all my components off DigiKey except for really basic stuff like resistors / connectors. You're almost guaranteed to get a bogus part if you buy things like transistors/ICs from amazon or Ebay cause the Chinese suppliers will put a die that's 1/4 the size of a genuine component and, for example, your 4 amp device will become a smoking hole at 1 amp
@@HyperspacePirate yeah sounds very accurate I have experienced that a few times, can you send me the link of the exact capacitor you have used as I couldn't find it and same with the fets
@@electronerd930 The cap in this video sucked because it had a really high ESR. Try this instead.
www.digikey.com/en/products/detail/kemet/C4AF3BU4100A1YK/8611241
FET
www.digikey.com/en/products/detail/infineon-technologies/IRLZ44NPBF/811808
Look on ebay for "induction cooker capacitors". They must have an "MKP" rating These are cheap, rated for 50kHz, and are MADE FOR this circuit!
Can someone please explain exactly what a choke is and how it works?
U built the circuit with a small induction coil and 60uh chokes instead of 100uh, i then ran it t about 6 volts drawing 1 amp but with no zener diodes, are the zener diodes crucial, all that happened is there was a slow voltage increase to 6 volts and then no oscillation and one of the mosphets was heating up slowly. Would this be the chokes or that there are no zener diodes.
Zener diodes are needed above 15 volts. Your circuit is not oscillating for some reason. Your voltage is too low too. Test with 12v and con connect it immediately without slowly increasing
Wish I knew more about Electronics
learn then.
Love your videos, but please build better microphone
I wonder how Stan Myers got water car running
Greeting
Are there any methode that prevent those coil from heating themself? Best regard
Use hollow copper tubing as the coil and pump water through it
Thank you Sir
Can i use to power flyback/eth transformer of crt tv ? To generate high voltage plasma_arc ?
You , of course yan use a flyback transformer to create high voltages. However that is completely irrelevant to this video about a high current induction heater. 🙄
What sim software is that?
Can I use an IRFP250N mosfet instead of IRFZ44N?
yes
I thinking I should build a more advanced one using microcontroller to actually melt some metal on small scale
Adding a microcontroller will make absolutely ZERO difference to whether it can melt metal or not.
can i use a 5W zenner diode?
It would be overkill, but it would work, yeah. I'm using 500 mW zeners in this circuit. Two 5.6V ones in series
@@HyperspacePirate im planing to use irf1407 which has 330W ,2 mosfets in parallel
@@ungnhanvaoprofilecuatoi2191 sounds like it'll work. Keep in mind the IRF1407 has a 75-volt VDS rating, so you won't want to give your circuit more than ~22V
@@HyperspacePirate ikr because i cant even buy a SMPs, all i have its just a laptop power supply
@@ungnhanvaoprofilecuatoi2191 if you can find some thrown out PC power supplies they usually still have working MOSFETs
Except..the ON mosfet would have close to zero Drain voltage, further turning off the other Fet. Your decription is not good
one day a mosfet will exist which will not get too hot, efficiency is what we gain with out too much resistance, but so much capacity for trans, sister. when i di owed, i induce and coil in a valve like xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxREDACTED
I'm more of a northwire guy.
I know this channel like i know, that email is in my name.
Okay, looks good, but what about the capacitor problem?
use fullscreen falstad😭
I liked the video. Buy a better mic.
Can you make me one of those for $20
I always see folks using transformers, but there is only ever two windings.
Why not have a transformer that has three or four stages?
Can you use this as an on demand water heater assuming the water pipe went through the inductor? Maybe a project suggestion, 220V on demand hot water heater?
Yeah but efficiency would be low, probably
freqRemainsConstantButInductanceOfCourseVaries.ItIncreasesALot,InMyOpinion.