2600 watt induction heater

[@Bartolobot]

do you have a schematic to share ?

[@dumpmboy64]

What were your bridge dc blocking cap value?

[@yaserhadadian]

Great! Is it possible to know about your circuit?

[@iamdarkyoshi]

Nice work man!! That thing really pumps a lot of power into the crucible! Well, it did before you popped the FETs :P

[@hajimuhammedqasim4047]

You are real mad man

[@imsmoother]

Nice job.

[@volljohannesbosco5917]

Would You please attach di Circuit diagram of your induction heater .. I want to replicate it.. thanks for your kindly..

[@gristc]

It's a pretty standard H-bridge driving the primary which you can find anywhere, and the other bit is a Rigol DG1032 frequency generator, so probably not much use for trying to reproduce it unless you have that or something similar.

[@DolezalPetr]

How do you limit the power going into the circuit, if the misfets are switching rectified mains, wouldnt they just short circuit the mains? Would using a choke help?

[@gristc]

Power is limited by what I can push into the induction coil, which is dependent on it's induction value, the caps and the frequency.

[@alessandrofranzini3323]

VERY GOOD.YOU CAN PROVIDE WIRING?

[@sebastianiragorri6884]

Hello, just one question. why did you go for the transformer coupling aproach? do you recommend that?, i am trying to decide that part of my heater, the other option are matching inductors, to go easy on the mosfets... thanks!

[@gristc]

A few reasons. First was that most of the high power induction heaters I saw online seemed to use one. I'm aiming for around 7500 watts, so figured I'd get used to working with this design. Also, with this arrangement it acts as a normal step-down transformer, so my MOS-FETs can be higher voltage, but lower current to deliver the same power. As and added bonus, with it like this the coil is floating, so safe to touch without getting shocked.

[@sebastianiragorri6884]

@@gristc got it, thanks!

[@DUIofPhysics]

What ICs are you using for the bridge driver and isolated voltage supply?

[@gristc]

The driver chips are HCPL-3120 and the DC-DC converters are DCP201515.

[@rusovich1999]

hello i have made a circuit res 10k and 470 5W irf 260 diode 12v and 4007 i use 12 pc ps but this not resist burn i test whit one ps and two in serie whats wrong????

[@gristc]

I'm sorry. I'm just a hobbyist. I can follow schematics and build my own stuff, but trouble-shooting other people's designs in beyond me.

[@rusovich1999]

@@gristc friend coment the capacitors an driver scheme and the tiroid. And what is the max time you mantain it turned on

[@frenchcreekvalley]

What frequency are you using? Have you tried different frequencies?

[@gristc]

Sort of. The resonant frequency is entirely dependant on the values of the capacitor and the coil, so to change the frequency you have to change one of those. Putting the crucible into the coil affects it, but you can't really change the resonant frequency while it's running otherwise. It's set to run around 70kHz which gives me a skin depth of around 1.5mm, slower and it will go deeper, but too slow and it will exceed the depth of the crucible sides. Going faster increases the impedance of the coil, which slows the current flow, which I also don't want. It's a balancing act.

[@frenchcreekvalley]

Thanks for your reply. I have been playing with the Chinese 1000 watt ZVS board a lot. It runs at about 100 Khz unloaded and drops maybe 10% under heavy load. I need to get a 1/2" square bar up to about 2200°F to forge it so I am shooting for about 30KHz. I'll be adding caps and inductors, in steps to see exactly what happens, doubling them, then again, checking temps as I go.

[@gristc]

If you know the current capacitance and frequency, you can use that to work out the inductance of the workpiece, and from there work out the capacitance you will need to get the frequency you want. It will be quite a lot more than you currently have to drop the frequency that much. I'm interested to know if it makes enough of a difference forr you. My approach would be more power. :)

[@frenchcreekvalley]

I have been playing with Fres = 1/2pi sqrt L*C. I have several sets of both C and L from boards that I have done bad things to in the past. Although I can repair them pretty fast now, I might as well use those parts, since they are already mounted on boards. More Power? Yes, but I am not sure I want to get that deeply involved. I have been moving up in voltage from 12 volts to 24 and then 36, with a "CNE" (Current Never Exceed) of 24 amps. That's with car batteries. Last step will be to install a 48 volt 26 amp Power Supply. As you already know, as I change other things, I have to adjust work coil diameter to hold the current in check. I am water cooling my work coil and fan cooling my board. So far I can run for 10 minutes easily at V36,A24 with caps and Mosfets not getting above about 120°F. If I can't heat the half inch bar hot enough to forge with my present setup (using 2 IRFP260N's), I may just move on. I'm about 3/4 done with a ground-up specialized engine ECU and I should get back to it.

[@gaynzz6841]

@@frenchcreekvalley forget zvs... cant melt nothing with that

[@raulbenavides2208]

Hola, puedes compartir el circuito, se ve muy bueno, te felicito por tu proyecto, quedamos a la espera de novedades tuya, Gracias.

[@konighansen9062]

nice work, but why are you running 4 modfets ?

[@gristc]

I need 4 to make the full H-Bridge..

[@gristc]

You need 4 FETs for a full bridge H driver. Allows me to puch twice the power through it as using a half bridge.

[@rajasharma372]

what price of this?

[@rajbir8443]

Nice vedio. But it would have been better if you give the schematic arrsngement of components with ratings, as students like me can take help in the pronect work for exanination. Hope. You consider the request provide the necessary information. Regards

[@_Junkers]

You sound like you're from NZ, are you? Do you achieve better energy transference with high current or high voltage running through your work coil? Great vids by the way!

[@gristc]

Thanks, and yeah, NZer here. :) Higher currents produce stronger magnetic fields, but you use higher voltage to achieve them, so, umm, both? Dealing with higher voltages (so lower currents) in the driver stage means less heatsinking necessary on my switching devices and fewer losses, so that's the direction I'm going. Hoping to go to 600v with this setup and I have some 1400v rated IGBTs in my cupboard looking for a purpose. :)

[@_Junkers]

I'll be excited to see that. What voltage do you drive the gates of the H bridge with? Do the high side drivers require a higher voltage to offset any feedback from the primary coil? My H bridge built from IRF540Ns just burnt out at a much lower voltage and I'm struggling to understand why. They were only running at 32V/3A at 57KHz. The high side drivers became extremely hot. Do you have any ideas on why this could be / what to look out for? Thanks!

[@gristc]

That sounds odd. I have noticed my high-side FETs get a bit warmer than the low-side ones, but not the drivers. I don't really know why that would be sorry. The main things that have killed my FETs have been when I had ringing due to missing/broken flyback diodes and pushing the voltage too close to the wire.

[@_Junkers]

Thanks again. What bridge drivers are you running?

[@gristc]

They're 4 x HCPL-3120.

[@geraldoferreira4715]

Parabéns pelo vídeo é show de conhecimento, ficou Top.

[@TSulemanW]

Nicely. maybe better use flyback coupling .

[@rajasharma372]

very nice i want same circut

[@Alexelectricalengineering]

Thumbs up, try tungsten !!

[@gristc]

Hmm, 3422°C melting point. I've already set my crucibles on fire. O.o My current goal is 2100°C or so to melt aluminium oxide and hopefully make sapphire.

[@Alexelectricalengineering]

gristc Graphite sublimes at 3642 °C, how much did you cranked the voltage up before the MOSFETs fail ?

[@Alexelectricalengineering]

***** Yeah, I know ;)

[@gristc]

I'm afraid I got to this point mostly by trial and error. The cores for the coupling transformer came from a commercial electronics salvage house. I just stuck together as many as I could fit in the space I had and hoped for the best. I've also changed the number of windings a few times to drop the current and allow me to push higher voltage.

[@0M42]

Hi, Frequency how many kHz?

[@gristc]

It varies with the work piece. Around 70 - 80kHz

[@ХатабычСтарик-ц1м]

Извращенец., пав выливать металл нельзя.

[@gristc]

мое судно на воздушной подушке полно угрей.