12V 50A 600W power supply - oscilloscope waveforms

Showing various waveforms in the 12V 50A 600W switching power supply module on an analog and a digital oscilloscope. It's a 2 switch forward. The waveform on the main ferrite transformer, gate driving transformer (GDT), output inductor (on an iron powder core), MOSFET gates, primary smoothing capacitor ripple, output ripple, mains input current, changes in duty cycle, transistor current and so on.
Next episode - schematic & how does it work:
• 12V 50A 600W power sup...
Previous episode - (re)winding the transformer:
• 12V 50A 600W power sup...
First episode - the teardown of this power supply:
• 12V 50A 600W power sup...
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/ diodegonewild
Instagram:
/ savage_danyk

[@TradieTrev]

This crappy PSU you've modded has become a valuable teaching tool! The way you explain it and show us the waveforms is just perfect!

[@stanimir4197]

@Agustinus Reynaldi it has 3v spike, it's very far from 'safe'

[@FlyingShotsman]

This really should be a million-subscriber channel. That was some of the best circuit analysis and demonstration I've ever seen, and it didn't take $20k worth of test equipment to make it happen. Pure gold!

[@electronicengineer]

I totally agree with you. Brings to mind a wise, old saying that goes: "It is not the tools that make the mechanic, rather it is the mechanic that makes the tools". I firmly believe that this saying is true. Fred

[@blackartista]

I realized one thing in this field...the more you teach others the more you grow professionally. I'll keep sharing knowledge with others

[@roseelectronics4582]

Your statement is true for all fields

[@sortofsmarter]

I always thought you had a old chunky oscilloscope, I now realize you have a classic irreplaceable tool that you operate with amazing precision and great ability to demonstrate it..Thanks

[@katsuoto4684]

agree!

[@TeacherBrunoOneil]

is it russian ?

[@MegaSunRise3]

This was really awesome and very interesting... especially that shot in slow motion. Great soviet oscilloscope also.

[@mrnmrn1]

I think it's Latvian, but you're right, Latvia was part of the USSR. So Soviet, but not Russian.

[@t_Gecko]

Can you explain snubber networks in one video please? Love your channel!

[@erikbertram6019]

Sam Ben Yaakov has some very nice videos on that topic

[@AlexanderBukh]

yes, please, saw those mentioned many times, but somehow the function and workings disappear from my memory

[@AlexanderBukh]

@@erikbertram6019 cool, gonna watch, but we also want Diode's take on it

[@g.d.8065]

That pseudo-slowmo idea using aliasing is genius. Seems roughly analogous to equivalent-time sampling.

[@cjjuszczak]

This really is amazing, and i wish more people appreciated it o.O

[@adriansdigitalbasement]

Such a great video series! I would love it if one day you could focus on the various ways these SMPS units do feedback, showing the signals and waveforms for that. (Going back to the magnetic coupled feedback on early SMPSs)

[@smeezekitty]

Its amazing how many of my favorite youtubers watch eachother

[@hernancoronel]

LOL, lately I have been consuming a lot of Adrian’s content and a lot of Diode as well with some of Noel’s retro lab and Marco Reps. They are definitely my favorite KZbinrs by far! Keep up the great content!

Videos like this will teach you more about switching mode power supplies than a university course.

[@rastapaez3992]

It actually does. True story.

[@kemalkurt5257]

Very informative video, you taught me electronics more than my university professor's. Thanks for your hard work and nice explanations.

[@LunarHermit]

The slow-mo scope was really cool! Really fascinating to watch the way the wave form moves around so rapidly.

[@rastapaez3992]

The more the technical quality of this channel improves, the more his particular accent increases. DOUBLE WIN.

[@cjjuszczak]

I've never seen anyone talk about his accent, anyone know what it is, it's really unique !

[@electronicengineer]

@@cjjuszczak I believe that Mr. Danyk (DiodeGoneWild) is from Czechoslovakia. Fred

[@stanimir4197]

An excellent take, major props. The output ripple is actually worse than I'd have though. One more video, replacing the caps with low ESL/ESR ones..

[@hernancoronel]

It is an awesome idea to measure the transformers with simple half a turn or a full turn of a piece of cable. I am always scared to measure with my oscilloscope directly fearing I may oversee some isolation and blow it up, using those wires it is almost impossible to blow it up. Thank you for another great video Diode!

[@astrazenica7783]

Very well explained, best explanation I've found here on KZbin. I am trying to learn electronics

[@DrHouse-zs9eb]

I love your old oscilloscope!

[@XarkoCZ]

You mean the PROPER oscilloscope.

[@JayPeeEV]

Best Electronics teacher and comedian.....love your videos and your cat.

[@ayyadew]

I love those slow mo shots

[@AllLoudNation365]

15:13 This has to be the best scope measurement I have ever seen.

[@robson6285]

WoW this is superinteressting! Great to see the scope while following the explaining. Super clear and usefull

[@JasonRobards2]

Wow. What a demonstration! This sets a whole new standard for this kind of videos. You seem to show every functional detail of the circuit. I especially liked the slow mo footage of the sliding transient voltages. It goes a little over my head what I'm doing as a electronics enthousiast, but it's nice to know there is a full explanation that's easy to follow.

[@valdisblack1541]

15:30 this looks f* AWESOME!!!

[@AlexanderBukh]

indeed, bruh

[@AlexanderBukh]

a very fine example why analog still matters, i was a long time a fan of CRTs, when lcds were used all around, don't care of the space, weight and power, as long it showed me a bit more ground truth

[@AlexanderBukh]

now i have 2 4k IPSs, 60 and 144hz and am not a fan of crts anymore, but the place in my heart is always there for them

[@2001pulsar]

Awesome. It's good to see all that in action.

[@159357ahmed]

still waiting for the explanation and schematics for this power supply , thanks man love your vidoes

[@alexloktionoff6833]

Thank you for detailed oscillograms and explanation.

[@englishrupe01]

Fantastic analysis and footage....thank you!

[@gregorymccoy6797]

I like how you made sensing wires using inductance. Good technique.

[@godfreypoon5148]

I think they were actually copper, not henrys.

[@Paxmax]

Very cool waveforms, very nice filming, turned out amazing!

[@AmatorElektronik]

Nice video. Best from Poland

[@johnoddvar1967]

Thanks for an exelent Video. I have learned so much from you about switching powersupplys.

[@diyordie7431]

Slow motion shots are nice :)

[@lakiza55]

Great video. Would be nice to see how you'd improve the output ripple. Like replacing or adding more capacitors or an additional filter stage.

[@LMB222]

He did it before, partially.

[@willrobbinson]

fantastic overview of operation , you have taken some time to get these "cro" shots ect , alot would not realize the time to do so , thanx so much for these vids ect

[@singhpk99]

Excellent analysis! Fantastic!

[@rtyzxc]

I didn't understand half of this one but it's relaxing to watch before going to sleep. Also, nice camera flex with the high frame rate.

[@Miata822]

Good video, clever use of the camera to get that amazing slow motion.

[@orpedsesama]

Amazing!!! Makes me wanna use oscilloscope more!

[@jp040759]

That was a great video. Really cool to see what is actually going on in a SMPS.

[@ahmadkadahsalim5048]

I don't know, how many times I will appreciate you for this explanation so Miga Respect . I would say 🔊 U R the King

[@isettech]

Many smaller supplies have only one diode in this configuration. The diode conducts only right after the transistor turns off. This current is monitored and is used for short circuit protection. If there is a short, the switching transistor only sees the current feeding the inductor, then higher current on the diode due to the lower output voltage is sensed when the transistor is off and the duty cycle reduced to a safe level. Many people starting to service switch mode power supplies realize that most conduct the output diode when the switching transistor is off. This is for protection from short circuits.

[@saarike]

Excellent video! Thanks a lot. 👍

[@piconano]

Beautiful video.

[@mac91077]

You are great in your field of work. Much appreciate your knowledge.

[@DJAndresViana]

Awesome explained!

[@randydicotti3975]

These videos are priceless. Thank you !!

[@rectificadoresfaraday1943]

Dan, you are a great professor....and by the way these such a eussian oscilloscope is wonderfull...

[@LMB222]

Hi Danik, we've seen that you've got less material to show, so I second the opinion that some theory, like snubber networks, would be great. You have a good command of electronics, so I trust you'd make an excellent example with actual parts. Good luck with your channel!

[@TechGorilla1987]

So, lets take a look at it....and my cat of course...

[@wouter11234]

"Mom can I get a new heatsink for my lamp?" -me "No, we have heatsinks at home!" -mum Heatsinks at home: 0:20 top left

[@FaysalKhalashi]

😁😁

[@arvinbaba]

Try to measure output voltage overshots by connecting tip and ground of your scop together and put it on negative of output voltage, you can see the spikes on any place of negative with this method!!!

[@petrhawliczek3302]

Woow the aliasing slow motion is perfect! Slow motion without slowmotion camera - You are genius!

[@sklepa]

You're The Best SMPS teacher I've ever had. You make me look on this topic from other perspective. Thank You! Have You seen prices of server power supplies? They can be bought from 100Kć and they seem to be not dodgy at all! And they also seem quite complicated. Maybe some video in future? Now Im modding one made by dell to use it to power hydraulic car lift :)

[@BIGRIP87]

nice oscilloscope

[@ProdigalPorcupine]

Dan- Hello from England, great video as always! You’re easily one of my favourite KZbinrs, you have a unique way of communicating with your audience, and you have a real talent of passing on your highly impressive skills that instantly hooks the viewer. I hope you don’t mind me asking - Is your day job electronics related? I’m also curious about that wonderful Soviet scope. Do you know its vintage, what its bandwidth is, and.... would you ever consider doing a bit of a teardown on it? I can’t be the only one who would love to see this, Soviet era electronics is so fascinating. Thanks for the great videos, please never stop! - Dave

[@brucel.6078]

Super genius!!!!!!

[@celsoneves2368]

Top show!.

[@Pirelli.]

thanks DGW, another awesome video and very interesting!! 😊🔋🔌💡🔦💻 ⌨️

[@Tirdad1981]

Fantastic Video! Thank you.

[@suleymanardc9806]

Thank you very much , very good

[@Gengh13]

That fake slowmo footage was really good, could you have achieved a similar (maybe worse) effect, but easier by setting the trigger holdoff to something a little over 10ms, so you sample different parts of the 100hz variation in each successive capture?

[@fullbridgeelectric]

Please what is the type of that pocket oscilloscope? Thanks

[@Conservator.]

15:23 This is epic!

[@EngineeringAllAround]

2:00 It's a full turn on a half of the magnetic flux!

[@Basement-Science]

Damn, that fake-slow-mo was awesome. That combination definitely beats a digital scope on its own for stuff like this! It shows how the duty cycle slowly increases as the capacitors discharge and then quickly goes back down at the peak of the AC input. How else can you even show the varying speed of the duty cycle changes in an intuitive way? Do any digital scopes come with a slow-mo replay mode?

[@Gengh13]

My rtb2004 is not particularly fast (maybe in a keysight scope you can see it clearly), but in the history mode you can replay your captures at different speeds, so I'm pretty sure you can do something similar. If you don't have that option I guess you can set the trigger holdoff to a little more than the 100hz of the variation to get a slowly moving waveform, you essentially sample a different part of the 100hz cycle in every trigger. Another alternative is to trigger on different levels of the input capacitor voltage, by moving the trigger level you can see the changes in the waveform.

[@Basement-Science]

@@Gengh13 Mx Hantek DSO4072c has so little sample memory (only 40K) that there is no chance of recording anywhere near enough points to do any kind of slow-mo. Yeah maybe you could do it with tons of memory. Trigger holdoff might be an option, but you're still limited to the refresh rate of your scope and it's gonna be just as fiddly to set up as on the analog scope. Just triggering on the filter capacitors doesnt give you the time aspect of it though. You could look at all the waveforms in the cycle, but wont get an idea of how fast they change into each other. Of course you cant do any of this with just an analog scope either. You need a half-decent camera for it as well.

[@stephanc7192]

Great video

[@SamSpiri]

Extatic videos

[@Electronic_For_You]

Diodegonewild Please make video on class AB amplifier

[@dktr2]

Awesome.

[@MC-01]

Can you make a video about on calculating the transformer

[@collinsmwaura1833]

Great video 😲😲

[@amrstaha]

Very informative. Thanks alot

[@nikiamz6501]

You should make a video about the power adapter from the pirl charger video...

[@omsingharjit]

Why there is no Microwave Oven powered by Smps high voltage efficiently ??

[@MuhammadDaudkhanTV100]

Great

[@jayvadgama3703]

Why they dont use iron core in transformer??

[@arvinbaba]

could you plz show us how to remove or decrease 25mhz overshot spikes ? Actually in most PC power supply is 2 switch forward and 80% of them have this spikes which is not good for mainboard healthy. REGARDS

[@simontay4851]

A lot are half bridge actually. A snubber on the output diodes and an additional output inductor would help

[@arvinbaba]

@@simontay4851 I think the EMI could be high.

[@two_number_nines]

this thing with better output filtration would make for a great secondary power supply to upgrade computers with high power gpus.

[@katsuoto4684]

I'm also interested in Soviet portable scope C1-118A analog oscilloscope!

[@Zebra_Paw]

It is possible to run your big oscilloscope without the ground. Just build a ground defeating extension... It's the only case where you can use it of course, otherwise it is very dangerous

[@cekpi7]

Or get isolation transformer, you don't need big one since oscopes aren't drawing that much power.

[@Zebra_Paw]

@@cekpi7 great idea. I was going to say that the power supply is 600W so the transformer would be crazy big, heavy and mostly expensive, but using it with the scope is brillant. Still you have to disconnect the ground from it but since it is powered via an isolation transformer it is not needed anymore.

[@eDoc2020]

@@cekpi7 There would be no gain by running the scope on an isolation transformer because its internal supply will be a regular isolated step-down transformer. Either way if you defeat its ground and hook it to the DUT's high voltage supply it will raise the oscilloscope's chassis to dangerous voltages relative to earth ground. It's one thing to do that with a small plastic-cased battery scope but I would definitely not want to do that with a large metal-cased oscilloscope because the shock risk is greater.

[@BogdanSerban]

I just disconnected the earth wire on my scope #yolo Of course for measuring two transistors at the same time I still need a differential probe, but I actually use a small transformer.

[@khayyam741]

Can you please tell the model of your scope I want to buy one.

[@zilog357]

Same here. I liked the scope. Would love to know make and model.

[@billwest257]

Regarding the high frequency ringing noise on the output signal, could that be ground bounce? What happens when you connect the probe tip to the same ground used to make the measurements shown? I bet you still have the ringing. Remove the long ground clip lead and probe clip, wrap a piece of wire around the probe tip ground to form a short ground lead. More than likely the amplitude will be much less with same low frequency ripple amplitude.

[@raffaellobottoni871]

Generally the ground loops introduce noise, but in this case it seems to me that it is due to the filter coil being saturated, the diameter of the wire seems too small for the current involved, and also as regards the poor quality electrolytic capacitors to remove those high frequency rings and improve the ESR, it is better to put ceramic capacitors of a few hundred pf at the ends of each capacitor. It would be better to redesign the printout with a double-sided design, precisely to obtain a clean and low-noise output voltage. But all these design subtleties, for such a low-priced power supply, I don't think the manufacturer has ever thought about it. However my most sincere congratulations to Diode, exhaustive and detailed exposition as always!

[@AlbertoPiscitelli_Music]

Fantastic

[@edgeeffect]

Whenever you get your осциллоскоп out... I get sidetracked from what you're talking about because I'm trying to read the Cyrillic. I have to keep rewinding! ;)

[@AlexanderBukh]

haha, same, не совсем, but still

[@ProdigalPorcupine]

I love the little ‘Sdyelano v SSSR’ badge! I taught myself to read the Cyrillic script (which I absolutely love) when I was about 12 years old, and that’s 42 years ago, so I hope that’s right, lol! I’m a bit rusty now. I don’t understand Russian, though. I’m guessing it means ‘Made in USSR’?

[@edgeeffect]

Я только немного понимаю.

[@ProdigalPorcupine]

@@edgeeffect - I understand almost nothing except hello, thank you, etc. lol! I really wanted to learn as a kid, but there wasn't enough interest at my school. I would probably have struggled anyway, I couldn't even get to grips with German!

[@MuhammadDaudkhanTV100]

Awesome arts

[@martinbobak3009]

Will you make vttc series?

[@matthew1333]

Hi I have poor understanding for switching power supply , can someone explain to me where to get the control circuit to drive the mosfet on and off ?

[@__--JY-Moe--__]

they call it no-easy!!

[@visiskasniekas4523]

Why dont you float your 2 channel scope? Basically i have an extension cord and i removed the ground contacts on a few sockets and i plug my scope in those when measuring mains stuff. On my scope its very unsafe because the scope body is mostly metal, but with your scope its pretty safe to do this (mostly plastic).

[@mirzageeelectronic999]

Excellent 👌👌 Review . I always wating for your new video. Sir how to test its gate driving waveform in oscilloscope. Plese answer it

[@burakuda]

awesome! please make a VTTC and poke it with probes and explain waveforms ?!?!? thx

[@dannyperry8070]

shouldn't there be another primary coil with a diode to reset the charge of the main primary. In this case I see only a diode for the reset. Somehow they avoided adding an extra winding.

[@DiodeGoneWild]

1-switch forward tends to have a resetting winding, but a 2-switch forward doesn't need it. It resets using the primary and the pair of diodes.

[@verhor3592]

is it not damage checking gate signal bipolar transistor used mini dso, on high voltage??

[@sumitmamoria]

Great video. Is is possible to try and see simultaneous wave-forms for voltage across the switch and current flowing through it? That could give some visual estimate of power losses.

[@legomachines5970]

2:55 the core of the transformer moved!

[@willitblow5929]

If someone adjusts the output voltage from like 12.5v to 14.4v could that make it die faster?

[@martinmendan9683]

Great, you are the best. I have 42v, 600w SMPS. Two current sensing resistors 0R18 damaged. What can it be?

[@tomkirkgaard247]

Even though the battery oscilloscope is isolated, I would worry about the break down voltage of the membrane buttons. Maybe it would be safer to press them with a plastic isolated rod.

[@DiodeGoneWild]

The buttons look like this from the inside: kzbin.info/www/bejne/nXSsYYZpd8iinMU not membrane buttons, but microswitches with several milimeters long plastic rods. It makes it a bit safer.

[@Yashethh]

In this mbr drop voltage also in this circuit

[@4000578]

The "horrible 3V ripple" is almost certainly the ground lead pickup on your scope. Try a low inductance "spring-clip" ground lead and it will go away. The loop area of a regular 10:1 probe ground lead makes it not useful for any PSU ripple measurements. Also don't forget you need to have a 20MHz BW limit on scope to measure ripple in a standard way.