induction cooker - ZVS waveforms

More experiments with the induction cooker. Waveforms on my oscilloscope, figuring out how does it work. It seems to be a series resonant circuit driven above its resonant frequency by an IGBT halfbridge. It uses zero voltage switching (ZVS). The transistors turn on at zero voltage, with no turn-on loss. They turn off under a current, but the turn-off loss is minimized using snubber capacitors. The output power is frequency modulated. Lower frequency gets is closer to resonance, resulting in more power.
The previous episode:
• induction cooker exper...
The first episode:
• What's inside an induc...
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[@dwaynezilla]

These teardown and analyses are exactly why I'm here. Ooo, and that demonstration with the snipped sine being overlaid is fantastic. That kind of insight makes this a great learning channel!! I'm here because I wanna see what's inside, but the explanation makes me _understand_ what's inside!

[@marcogeri]

You are awesome! I work since more than 15 years on these stuffs and this is probably the best explanation of resonant power stages I have ever seen. Glad to be one of your patrons. Please continue like this.

[@l_szabi]

The coil heats the pot not just by eddy currents, but also by the hysteresis losses, which (i think) may be much more significant in this case, that's why it only works with ferromagnetic materials, like iron and steel. Aluminum is not ferromagnetic, but it could still be heated by eddy currents. However, usually the bottom of aluminum pots are thin so less eddy currents can flow there. I think it could work with thicker pots, even not ferromagnetic ones, I'm not sure though. I need to learn more in this topic, but something tells me that the magnetic properties of the pot is important. (Maybe for the coupling of the field of the coils?) You can also think of it like the pot being the core of the inductor. The cooker basically utilizes the heat that would mean the losses in a transformer. Maybe you could try is with sheets of various thickness and materials. Also, awesome video as always!

[@Langendimi555]

Awesome! Thanks for spoiling us with so much video time this week. We should send more power electronics to CZ, these video's are brilliant. No adds, no annoying music, but to the point and amaaazing! Please never stop, this is gold for electronics enthusiasts like me. I have learned more from you (smps) than I did in school.. But these resonant circuits still feel like black magic tho when trying to tune/adjust them 😅

[@fabiomuzzi7047]

The "Paper waveform simulator" is fantastic. Very nice and clear explaination!

[@EdwinSteiner]

Your paper waveform simulator is so awesome! Great explanation!

[@DrHouse-zs9eb]

The buttons probably worked fine with the original glass on it... But you are right about the rotary knob. The new models got rid of it.

[@andymouse]

Fascinating breakdown ! sooo much info and well explained, I especially love you PWS demo ! ( Paper Waveform System) great way to teach.....cheers.

[@dosgos]

Bloody great cooking video series.

[@anoimo9013]

Absolute thorough explanation with high level of practical details of a complex black magic-like phenomena

[@LawpickingLocksmith]

Super! Always wanted to do this myself. Thanks for showing. And you picked the best cooktop too!

[@johnconrad5487]

Good explanation. Thanks for making this video.

[@largepimping]

I've been looking at induction cooktops -- those are great points about the capacitive buttons/switches. Helps me with making a choice!

[@achimxe2617]

Great explanatory video!

[@Speeder84XL]

Really interesting! Appherently they use varying frequency to tune/detune the circuit more or less into/out of resonance, to regulate power. Always running the circuit in full resonance (with true zero voltage switching) and have current regulation on the input instead, would give slightly better efficiency - but requires more components. It's all about making simple and cheap design and it's still way more efficient than an "ordinary" stove using resistive heating.

[@dosgos]

Awesome paper cutting example. Complexity well explained.

[@seandoofer5720]

interesting lesson in magnetics, thanks Danyk.

[@nguy80303]

Thank you!!! I studied resonant converters in my master degree classy. I had not thought interns that above resonant converters is exactly cutting the sine wave short. I gain new knowledge today

[@Pirelli.]

Great explanatory video! Thank you very much mr DGW!! Greetings from switzerland ☺️

[@THEMFORMATION]

Damn this guy would make a good inventor.

[@ivankirola2707]

I am happy to see this oscilloscope

[@imapay2winandyouarefree2pl87]

I'm Late But That is awesome Waveforms

[@roseelectronics4582]

You're not late.

[@Dumpy.38]

Same

[@mohinderkaur6671]

Great explanation - Thanks

[@barjan82]

Cooking our Saturday lunch soup on a induction cooker while watching this 😀

[@electronic7979]

Helpful video 👍

[@godfreypoon5148]

Tractor feed paper!! With tear-off sides!!!!!

[@mikajuurikivi4293]

Really good video 👍

[@YatendraSaraswat]

Love the content & our South Indian ascent is awesome 👌

[@gabrielhacecosas]

Please make a secondary coil with many turns that is in resonance with the cooker coil and see if it becomes a tesla coil, I've always wanted to do that, but I don't have an induction stove.

[@spamlucal]

Your videos are amazing

[@marcinborkowicz2557]

Danyk, bloody hell!😉 It's my second attempt to watch it carefully and (try my best to) understand as many as I can. First time I fell asleep but not because the video was boring or too long, no! - it's because at the evening I like to challenge my brain and bend it at such demanding but fricking interesting things like you present. Anyway, man - you've got an exceptional talent to teach people some nerdy stuff in such interesting and educative way. Kudos!

[@francoisdastardly4405]

I really love your soviet oscilloscope !!

[@katsuoto4684]

I think This ZVS behavior on this video is similar to that of LLC converter, and also I think this ZVS topology well fit to this application due to driving inductive load. Thank you for sharing interesting video!

[@firefox1136]

Thanks for the Great vid! I have a video Idea For you: You could turn your SSTC into a DRSSTC by adding a resonanz capacitor to the primary side. It would be interesting to see, what effect it had on the arcs.

[@Paxmax]

Awesome walkthrough, great explanations.... and yes, what the heck happened to stove useability over the years?! This touch-design-over-function BS must stop, just give us easy grip knobs that turn, are easy to clean and doesn't get flooded over incase of something boiling over. One of the great features of induction is that it almost instantly stops adding heat once you turn down (as opposed to steel plates/IR).

[@RGMadu]

I will leave a like because I liked the whole videoooo.

[@JAINUL_HAQ]

I only picked up 10% of what you are talking about.... But want to learn as much as i can

[@mylestechnological7031]

That waveform looks very close to a circuit that I designed

[@endremurti]

hy thanks for explaining such awesome work,, what diode do you use to limit the voltage of the current sensing probe?

[@rogeronslow1498]

Nice video. I wonder if the power devices have anti-parallel diodes in them.

[@user-vm1hi7bo5s]

It's probably would be easier to manage this controls by changing the radius your finger is making. When you have to change power, place your finger closer to the center of it and vice versa.

[@bonzeno85]

Man. You're so smart...... ...and so is your cat 😂😂

[@douro20]

So why did they take this thing apart? Did the control panel stop working?

[@souravrangnekar2347]

Can u tell.....induction cooktop is of which brand?

[@MuhammadHanif-bx4pb]

I have cheap inductive stove (around 30USD) and it seems like it not that advanced, it basically cycles periodically like resistive element. if I set it to minimum power it have duty cycle of 10% with around a minute or less for the cycle to complete and if I put it to 10 it basically stays on. and the amazing thing happen when it's fully on. after 10 minutes of operations the big "smoothing" capacitor right aver full bridge rectifier pops and fuming and surprisingly the fuse didn't blow FML.

[@addd281]

👍

[@Azaakiel20]

looks like pulsing reactive powers of the coils?

[@morijitesh5923]

Grate👍👍👍

[@sortofsmarter]

Cooking with diode's...lol

[@rex-up9ln]

unexpected face reveal @ scope screen ;)

[@firefox1136]

to be honest, you can find pictures of him on the Internet, you just have to know where to look...

[@rex-up9ln]

yep, I know.

[@edgeeffect]

Could you make us a basic tutorial on how KVD drivers work?

[@user-vm6mv8il6s]

how can it turn on zero voltage

[@Purple431]

Insulated Gate Bipolar Transistor

[@roseelectronics4582]

Invented by an Indian scientist.

[@PCbolt17]

@@roseelectronics4582 Jayant Bakigha sir I think...

[@roseelectronics4582]

@@PCbolt17 I'm sure. You got a nice channel going, subscribed.

[@Purple431]

To me? ^w^

[@roseelectronics4582]

@@Purple431 I just said IGBT was an invention of an India physicist.

[@makspesic2869]

😃👏👍👍

[@HazeAnderson]

Sawtooth wave is just a triangle with a skewed duty cycle. 😏

[@shayhsopwagqehghggtfyggty2635]

Can it work with 400V AC?

[@rkan2]

If you are talking about three phase, then yes in previous videos he explained it was a three phase - as many European stoves/ovens are.

[@DiodeGoneWild]

No, it's not 3 phase. It has 2 phases going into it, but each half uses one of them and neutral. It runs on 230V, not 400V. The components are not rated to run on 400V.

[@piconano]

We've come far from cooking with camp fire!

[@ciprianpopa1503]

So, no carrot soup recipe?

[@cherrymountains72]

Wow, chain paper... Dot matrix printers rejoice!

[@bladelt1]

now make it full bridge

[@amkp40technology]

Nice 14:57:

[@taharmouz8864]

More complicated episode

[@PreetPal2107]

Well, no one do so much analysis as you doing bcoz girls and women knows about eating and cooking 😄😄

[@Ka9radio_Mobile9]

Who needs math anyways. :-)

[@liudas5377]

Hey, no cat shot?...

[@DiodeGoneWild]

the cat is at 7:31 :)

[@englishrupe01]

He doesn't shoot cats....he only photographs them.....and he did that, yes :=)

[@chelarestelar]

.

[@savage101.]

What accent is that

[@peterpeper4837]

Why do you speak like that?

[@RobotN001]

This is the best English from the Czech.

[@dosgos]

Not really on point regarding this brilliant video.

[@Paxmax]

🤔 you mean english..? Hmmm.... Greater audience reach..? 🤔 ...😁