SSTC pt. 8 - snubber networks & inductive load test

Today, let's do some experiments with RC snubber networks in my Solid State Tesla Coil. Let's test the IGBT halfbridge using an inductive load and do some oscilloscope measurements. The snubber networks limit the voltage overshoots on the transistors and the dV/dt, so the transistors don't fail.
The first episode:
• SSTC pt. 1 - intro
The next episode:
• SSTC pt. 9 - Theory (w...
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/ diodegonewild

[@DIYwithBatteries]

Your cat know everything about electronics LOL.

[@mbender8653]

What a break from all the other expert electronic videos where they have all the most advanced and expensive electronic instruments. I praise you for making do with measuring instruments that you have designed yourself! Outstanding!!

[@oldmanhuppiedos]

You are well versed in electronics, and the cat also likes to study together.

[@sa8die]

i love the info and the precision

[@nelgau]

This is the most riveting series! I can’t wait for the next episode!!! :)

[@richardnanis]

Thanks for the measurements. Very good explanations as always! :-) This is now an induction heater with frequency driven half-bridge.

[@Miata822]

I'm late at watching these videos. I wanted to wait until I had time to pay attention. That was a good idea. Between the explanation of the Miller effect and your experiments in this video there is much to learn. Thank you for making these detailed videos.

[@alberti.2334]

Good job. You made me want to build a Tesla coil following everything you did. It all seems perfect.

[@Debraj1978]

I am making a 3KW to 6KW, half bridge induction heater and your videos are very helpful.

[@stephanc7192]

Great series! Thank you

[@ScienceLab760]

Thanks for share, is very interesting see the most significan points to test when you make a power electronics, this save many igbts for the trash.

[@rpbajb]

Your cat really loves you.

[@matyasnyilas]

"bloody crazy steaming hot". "Bloody" is here as well.

[@pirataga]

Diode, would you consider making a series of videos teaching the basics for us that don't understand much about physics and electronics?

[@obsidiandestroyer7015]

up

[@tvishmaychoudhary69]

​@@obsidiandestroyer7015 vote

[@kaveh8425]

I always enjoy your videos! just one thing about the probing when you have a large coil driven by pulses. It can easily induce voltages in the oscilloscope probes (thru the loop formed by the gnd connection of the probe). The magnitude of the induced voltage depends on many factor of course, so it could be small or large, but it worth checking to make sure the readings are not thrown off a lot.

[@sfp4197]

The cat learned you everything you know

[@Cadwaladr]

The cat is his teacher.

[@sfp4197]

@@Cadwaladr the cat is an engineer at ABB

[@gacherumburu9958]

Thanks for the info! 👍

[@electronic7979]

It was a nice video with useful information.

[@bassbatterer]

Looking good.

[@opinair]

Thank you i love your chanel and i know your homepage years befor

[@wolfgangboettcher3126]

Da ist was dran,thank my freand verry good

[@barjan82]

CAT! CAT is everywhere :)

[@traxonja]

Nixie clock spotted at 10:00 :)

[@69iqtutorial]

Wow

[@Astri.electronics]

When you bypassed those resistors, the ringing didn't have that high amplitude as the overshoot with the resistors, which brings me to a question, what is better.. A short high overshoot or long ringing?

[@mdsanto6592]

Very useful video sir👍

[@Debraj1978]

0:58 = cat purrrrrr. Cats all over the world purrr

[@prathikprashanth2932]

at 10:43 i would bypass the 4.7ohm resistor too with the diode, since it is only required during discharging

[@DiodeGoneWild]

This is done in single transistor things or in a 2-transistor forward power supply, because they only switch in 1 polarity. You can't do this in a halfbridge. The opposite transistor would charge the capacitor with no resistor in series (during hard switching).

[@rahmanocawni5618]

Introduction, principe of function, description of the material, tools and testser used, opération, summary.

[@the_perigoso]

This episode was approved by the cat

[@noakeswalker]

If you had a variac, you could ramp the mains input up and it would not be quite such a scary transition :o) Great to see the development of this into its final shape...

[@Conservator.]

Tx! 🙏

[@WolferAlpha]

The cat knows about the risks of electricity, so he stays on top of projects trying to prevent the human from committing something that can go wrong. Cat predicts the future.

[@vacuumboy6.0]

Beautiful cat

[@bladelt1]

you can be very good teacher

[@TheJavaSync]

OMG is that CNC Milling PCB - I loved it :v Thx You anw !!

[@jaakkolehto1487]

TheJavaSync Watch his previous videos. It's a dremel PCB.

[@teardowndan5364]

@@jaakkolehto1487 DiodesGoneBoom upgraded himself to computer-controlled :)

[@159357ahmed]

i hope the some day you will make a video about VFD driving induction motors and how it control IGBT and current flowing through IGBT and current flowing through freewheeling diode

[@markiangooley]

I love how the oscilloscope is labeled OSCILLOSCOPE (in Cyrillic letters with I’m guessing the usual Russian spelling) just so people will know it’s not a weird television set. (Though I’m sure that many American oscilloscopes are also so labeled, though in my limited experience less prominently.)

[@tonywalton1464]

He did an episode on it a while ago. It's an oscilloscope from the USSR.

[@Infinion]

The body diodes of transistors are usually very slow acting and have generally pretty high voltage drops. I would recommend trying some fast acting schottky diodes, superbarrier diodes, or TVS diodes with low capacitance and high reverse recovery time near the transistor. Unfortunately you're dealing with through hole, because SMD would offer the best results in terms of series inductance.

[@hobbyrob313]

Hello sir, I am a hobbyist and try to understand your videos a bit. I want to try to make a modulated power supply myself so that I can build a PWM modulated AM transmitter. Friendly and healthy greetings from the Netherlands! Rob

[@Basement-Science]

Do you think some faster diodes across the transistors would reduce the overshoots?

[@kahveciderin]

I see a cat everywhere...

[@coloradowilderness3139]

Derin, You must read The Black Cat By Edgar Allen Poe .

[@MrDaniyalAh]

Didn't know u were this intelligent! Loving this series!

[@ripstephenhawking8787]

Which points in the circuit do you probe to display the working waveform on the oscilloscope?

[@uK8cvPAq]

Would a low ESR decoupling capacitor right across the upper IGBT Collector leg and lower IGBT Emitter leg help with the spikes? As sometimes its caused by the inductance of the DC bus between the fets and rail splitting capacitors.

[@alirezaeskandari2287]

great vids dany why don't you use ceramic capacitors for your snubber?

[@simontay4851]

1:00 purry cat.

[@BogdanSerban]

Do a diode+TVS front to front plus an rc snubber. The TVS clamps the peaks and the rc snubber reduces ringing.

[@ayyadew]

This series is getting longer than game of thrones

[@Infinion]

How are you finding IGBTs vs MOSFETS for this application? I watched an Infineon webinar regarding their SiC and GaN technology a little while ago and it was quite impressive. Their FETs seem to outperform IGBTs, and in the case of GaN, they don't have body diodes!

[@DiodeGoneWild]

The best MOSFETs could be better than IGBTs, but they are bloody expensive.

[@cezarcatalin1406]

Why not use a high power zener to clamp the overshoots ?

[@MegaSunRise3]

I can see the cat gets feed properly

[@rickjljr11]

Does that bottom IGBT do anything but provide a diode to discharge the inductor? Should those 11uF capacitors be in series with the coil?

[@rickjljr11]

are you sure those snubbers do anything?

[@rushb9388]

Do you not understand working principle of half-bridge?

[@devenyi73]

Thank you to starring your cat!

[@AltMarc]

The Tesla coil isn't what interests me, but as solid state induction heating, the knowledge on these IGBT is great to learn in such details.

[@jamesblackwell5141]

Cat say, "Mine!"

[@noelj62]

What is your public electricity company limit on current drawing in your area? I'm limited to 30 amps max on 1 phase.

[@DiodeGoneWild]

We usually have 3x 25A (3 phase) main circuit breaker before the electricity meter. The wall outlets tend to have 16A breakers, sometimes 10A. Some appartments only have 1x 25A main breaker. Those are mostly appartments with gas supply. Having gas powered heating, water heater and stove, 1x 25A supply is enough.

[@johnnz4375]

Paul NJ , here in New Zealand the pole fuse is 60A per phase most older houses and houses in the country get 3 phase ( 2 for normal use and 1 off peak switched for hot water) but I have seen modern houses in town that only get a single phase supply.

[@postualin6551]

Same in Moldova 30amps max 1 phase

[@Tx_6969]

Nice cat.

[@Debraj1978]

Are you planning to switch the PWM at close to resonant frequency (or slightly higher than resonant frequency)? Because, under that condition, the turn-on lossed on IGBT is minimised. Without a closed loop control, the control of PWM frequency to exactly match the resonant frequency is impossible. With manual control (potentiometer), you will be able to keep a freq higher than resonant (in inductive zone).

[@DiodeGoneWild]

Of course slightly inductive (tiny bit above resonant) is the best :).

[@michaelfisher9671]

Can someone please explain DGW's comments at 1.35-1.42. What diode is the current going through, and why? Thanks

[@drobotk]

It's the internal diode of the IGBT :)

[@michaelfisher9671]

@@drobotk Yes I understand it has to be one of the IGBT diodes since they are the only diodes. But which of the IGBT's and why? When the gate of the low side IGBT is high, the halfbridge output is low. So the diode in the high side IGBT is clearly going to be back biased. Why would the diode in the low side IGBT be forward biased? Maybe when the halfbridge output is low, it is slightly lower than the 0V rail, so the diode conducts?

[@drobotk]

@@michaelfisher9671 Hm well I'm not sure about that too

[@michaelfisher9671]

@@drobotk Glad I'm not the only one!

[@DiodeGoneWild]

The current goes through the internal diode of the lower transistor, and after the tiny notch, it goes through the lower transistor.

[@anindyamitra5091]

8:27 anyone??👀 ....with english auto-generated subtitles on?

[@arturtrzebinski2112]

XDD

[@michaelfisher9671]

That is hilarious

[@sunridersclub]

Epic funny

[@SigEpBlue]

At first I was like, "is he talking about the cat's speech bubble?" But then I was like, "Ohhhh...." LoL

[@MrFiver1111]

If you're gonna pull 30A from mains how is your power breaker not gonna pop, in my house the limit is 15A. Did you sign to have a higher supply from the electrical company?

[@johnnz4375]

Galego , what country is that ?

[@amiralozse1781]

I'm afraid your cat doesnt approve your current work. Nevertheless, I certainly do!

[@sortofsmarter]

I would love to be your neighbor..lol

[@threeMetreJim]

Looks like the cat is one of those technicians that is expecting a 'pop' from a failed test, but still jumps a mile every time. I suffer the same, and dislike mains powered circuits for that reason (although I'm still waiting for a 'pop')

[@sfp4197]

You need more powerfull electronics 170A igbt FGY160T65SPD Izolated gate driver 2a peak Lmc555 oscilator (10khz-1mhz 1-99% duty) Input filter Curent limiting

[@drobotk]

His goal is to make this SSTC as simple as possible I think :)

[@Antagon666]

that igbt is hella slow and has very high switching losses...

[@sfp4197]

@@drobotk for me is the oposite

[@sfp4197]

@@Antagon666 you can put a 12v 1w zener to the gate or drive it at 0.5-1a and it is 130ns slower

[@bluerizlagirl]

I think the cat probably does not want anybody to see your diagrams! She always sits on them!

[@hpekristiansen]

A normal metal snuffer is much simpler and not expensive at all.

[@ashokballatagi1318]

E Riksha Hall effect sensor plate explain with circuit diagram. Thanks Ashok... Bangalore... India

[@yonaemanuel]

I like your 🐈

[@ncot_tech]

Inductive cat heaters... that could be a thing.

[@richespiritu2101]

TVS?

[@electricbase1930]

Give me link or name of book on souce of your knowladge

[@electricbase1930]

Hey, give me answer, why you using so much capacitors in my half bridge switcher i use two 400v 100uF electrolyte capacitors im from russia and i not completely understand your words in video Я просто хочу узнать почему в подобных проэктах используют параллельно соединенные конденсаторы с напряжением от 600Вольт, может быть с учетом индуктивного выброса напряжение конденсатора высокое но я не пойму почему их несколько (в россии мы называем это "батарея кондеесаторов" )

[@adamsoucek4140]

Is SSTC useful for something? Why you didn't use your pocket oscilloscope?

[@tetraederzufrequenztesla2342]

The cat engineer is disagree with the схему. And manifest to the cam his refute argument. Very Funny. Спосибо больше дрг.

[@mohammadirfankhankhan9850]

Sorry no technical error. It brain broking error

[@mohammadalfauomey3443]

Is your "cat" wanted to hide the schematic ? or you who wanted that ? Thanks

[@coryulrich6489]

Is this how you are supposed to read cursive out loud?

[@stalkerfromvoronezh4493]

In next video: KaBOOM!

[@nelsonpalomo2688]

Hello mi frends, i donot speek inglis, puedes hacer un vídeo igual pero en español, thankyou saludos.

[@sortofsmarter]

cat science... he will eventually rise up and take over the world...lol

[@chegpatalinghug6823]

Wtf 😂👊👍🏻

[@peterasztalos6370]

Face reveal??

[@Cadwaladr]

You can see a picture of him on his website. He's pretty cute.

[@andricode]

@@Cadwaladr Thats because his cat wanna stay with him in his lab :)

[@andrasnagy6923]

more than 100 wiews under 4 minutes👏👏👏

[@ayha4115]

wiew? 🤣🤣🤣

[@drobotk]

half od them was before this video was public, so more like 50 views in 4 minutes

[@johnconrad5487]

Snubbers are not a very good solution. the wire wound resistors are highly inductive. Have you tried some fast diodes across the transistors and the two series caps that you have across the line should be located as close to the two HB transistors. By the way, you have a very needy cat that requires a lot of attention. she/he should be allowed to go outside more often. :):)

[@DiodeGoneWild]

The resistors are of course not wire wound. They are film resistors. The diodes are already inside the transistors. The cat is just indoor cat. My girlfriend would never allow her to go outside. There's to much risk of getting lost, torn apart, ran over, poisoned, catching a disease and so on...

[@amciaapple1654]

Good technical content but please shorten the pronunciation of your vowels.