24V 10A 240W power supply - test, failure, teardown and fix
ฝัง
- เผยแพร่เมื่อ 18 ม.ค. 2019
- Today I took a look at a cheap 24V 10A 240W switching power supply module from Ebay. Let's test it, let's see what's inside, let's find its fault and let's repair and improve it :).
The next part (detailed explanation of the schematic):
• 24V 10A 240W power sup...
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It's a combination of intellect, dry humour and your English that makes you unique and brilliant! A pair of thumbs up
We need more of those comments :)
"You've got to be kidding me, guys."
It's is trrrrruuuuueee
Your presentation style, your english pronounciation & of course the way you torture the equipment during your testing are unique on you tube. No other youtuber has these qualities. We love you.
I forgot to mention your cat. Quite cute one.
Quality job there from the factory, I never realised china had invented the one-legged capacitor... :P
twocvbloke That’s really amazing!
Works great. Infinite breakdown voltage, and the capacity doesn't matter. Brilliant!
Electrictronic
Bloody HELL!! :D Well it's obviously an assembly error, whether it's manual or automatic. But what's really troubling is that it has supposedly passed QC yet Diode has clearly shown us the specs were out of whack (ex. the higher than normal standby power consumption), which leads one to believe that there may not even be quality tested or maybe just random ones only. Oh the one legged cap... they've tried to save some colder... tsk-tsk
You get what you pay for!
You are absolutely crazy if you have made a schematic to it, even if it had some mistakes... I'm quite impressed of your knowledge and patience, despite from the fact that I've been your regular viewer for over a year... - greetings from Poland! P.s Keep doing what you do! Your cat is absolutely cute! Congrats for 100K subs.
Ķ
Capacitor gone wild 😂😂😂
Congrats DiodeGoneWild 👍👍 💯 💯
More like the inductor coil gone wild... getting hottt!! he-he
2Legs1Hole
Hello there can you make a wall lamp with angle control and display different shades!!! th-cam.com/video/bUFwJuKF4eI/w-d-xo.html
Dane, ty jsi neuvěřitelný - srozumitelné informace i pro absolutního neumětela zábavnou formou, trocha, tedy i více šíleností. Díky za videa.
The bleeding resistors on the main caps also act as a voltage divider to make sure the voltage is nicely divided over the capacitors in series.
That's right :). Otherwise, the voltage may not divide properly in case the capacitors have significantly different leakage current.
Thank you, Diode! Congratulations on100K subs!
Looking forward to schematic explanation. Especially TL494 working principle.
Congratulations with 100 000 subscribers, DGV.
As far as I understand youtube, you are doing the right things. Such as ... uploading regularly. Interesting content.
And you put alot of time into your videos.
Even if you understand electronics very well, it takes some time to reverse-engineer circuits and draw those schematics that you do.
U just have to love this guy's accent or what?. And his knowledge is huge.
Always love your explanation about power supply, you had a great experience with huge knowledge in supply and your ckt diagram help me a lot many times, Multimeater, and supply diagram, too
Finally New video. I Waited for it so much. :)
Excellent video. Congratulations for 100k subscribers! Thank you for your work!
Congrats on 100K
Thanks :)
@@DiodeGoneWild Hey ;)
At 17:59 we see his beautiful cat - an important part of his success :-)
And being a virtual rocket scientist of electronics, this genius fixed several problems. Fascinating. ' -_- '
i fix my 2 years dead power supply 24v 20amps and now working perfect again i have zero knowledge but this video is perfect thank you for this video !!!
I cant imagine the time and effort it took to look up and draw that schematic! damn!
I like your content because of step by step explanation of each part and you uses all conventional stuff for measuring. I'm always waiting for your switching power supply videos. Because it's grate and I learned many things from you. Thank You for those kind of videos.
Very witty course in working and troubleshooting of SMPS. Very smart man, and he explains very well. He addresses every fact well, and he is not boring. Excellent.
BTW, in this lab, the cat should be placed in charge of ESD protection of all MOSFETS.
Wow....... I love it ......what an English...so pleasing. Impressing tone you have.
Great video and awesome repair. and congratulations on 100,000 subscribers you deserve all the rewards that come with the hard work you you have put into so many videos.......
Was beginning to miss your videos. Enjoy your videos very much!
24:42 I can't imagine you made it.
25:17 Still you are underrated. You deserve more. Or maybe only smart people subscribed you. ;)
Sir, execellent test, fault detection and improvement. Congratulations!
That's why I like your channel and watched all your videos. This video was so informative and useful for me. Thank you.
Thank you so much for your time and Diligence for producing this video.
Thanks this was one of your best uploads yet. I have a list of things to characterize and test on a similar power supply now.
I've been working on a large LED bench light for ages and planned on having temperature and power monitoring. I keep letting too many features creep into the project (clock/room temp/LCD/menus/single button with multiple functions/watchdog timer/etc). I guess I'm still too stupid to "Keep It Simple *."
...anyways...now I want to add mains current sensing to monitor efficiency too ;)
Thanks for the upload.
-Jake
Your cat is sooo lovely! Thanks for testing the power supply, btw.
Thanks for all the great video's of SMPS's .I have learned quit a bit from you. The fear of working on them has been removed, THANKS
Congratulations on reaching 100k subscribers!!! 🎉🎉🎉
Great explanation , Congrats on 100K
100k suscribers, bloody well done!!! Your chanel has taken an up-swing, I believe you can become much more popular, especially if you make videos about interesting devices like this PSU for example! You may also want to add a means of contacting you for people that may want to sent you a device to analyze/fix/make a video about!
Keep it up!
100K completely insane my friend!
Congratulations for 100k subscribers
I am so glad that your cat is an artist.
I love how you give the viewers a breath by incorporating your cat into the video
Thanks for another interesting explanation, you certainly help my knowledge of switch modes ! Congratulations on 100,000 subs, well done, I am working on getting there, I guess I need to do more educational types of videos rather than just repairs and reviews!
Down unda! You have a great channel too! Have you ever watched SMPS channel called MrJohhhnnnyyy ?
KW PCtek - thank you. I haven’t heard of that channel before, I will have to take a look
Congratulations for 100k subscribers!
Congrats for the 100k subscribers!
Tak tohle video bylo jedno z nejlepších. To se fakt povedlo. Člověk se i něco naučí. Dík. A víc takových.
Another very interesting video with a lot of useful info, thanks. That 4.7uF @ 50v was unbelieveable.
Outstanding video, love smps videos, congrats for 100k subs!!!
Analysis and explanation of very high level. Big thanks
I am absolutely astonished by your power meter made out of a multimeter. It is always convenient to have a small device on hand to check things. Is it possible for you to uncover the working principle and circuitry to all of us? I really love this modification.
U explain much better than our prof. do. Thank U very much
Waiting so long for this. Just want to buy something and send it to this guy :)).
Fantastic video, thank you so much for sharing, had not thought about winding an extra winding for the scope, realy nice idea.
I have used a little inductor held close to the transformer, coupled to the scope before, to determine if the transformer was switching, that also works, but you dont get the correct waweform, only to determine if it is switching.
Looking forward to the explanation video.
Greatings form Denmark
Congrats on 100k subscribers!
in the first 5 seconds I was sure you were russian... but then I heard how you spoke and I started grinning like I was crazy...
subscribed!
That's not the worst power supply I've ever seen, but it leaves a lot to desire. You've made a very nice improvement there.
Congratulations on 100K subs!
Great vid. Look forward to seeing schematic explanation video.
Love your videos. I think you explain and diagnose problems way better than Dave Jones.
Great video, I am looking forward to see your schematic explanation because I have the same power supply in 12v/15A version with problem. I measure 12v on the output with no load connected. When I connect a load It collapsed . I believe your schematic analysis will help me to figure out the fault.
Thanks for an interesting, informative, and very well structured video
Excellent video. I learnt a lot over my first coffee of the day.
Can you rewind the inductor with copper wire and see what effect that has? Great explanation of the problem.
I definitely plan to rewind the inductor ;). I also plan to rewind my vintage frequency meter. The problem is that I left my transformer wires in a different location, so I can't do it until I pick them up.
Cool I am looking forward to seeing the video you make. Great video as always
Perhaps a better core as well
@@DiodeGoneWild Maybe trying to beat 90% efficiency by modding (well, fixing really) it further would be a nice challenge? :D
Hardcore mode: using only scrap parts!
@@uK8cvPAq sure - we can try it once you take it out of your arse!
also - the wire would be too thin.
Congratulations for you 100K subs !
Epic analysis.
Your very talented.
Yey many series love your channel
100K? Those youtubers are growing so fast T__T. Good luck with 1 million.
I need REALLY a lot of good luck with 1 million ;).
I can learn everything I want from you! the halfbridge PSU design is super fascinating, normally in professional PSU's (like a quality TV set) they will be at super high frequency using Litz wire and a smaller capacitor. it is pretty robust that it doesnt explode because one of the transistors died.
I really love your intonation ! Great job !
Thanks for the explanation and the schema.
I'll make it clear, I love your videos, mainly because of the amount of information you provide on the subject of the video, it seems to me that there is no lack of details (it must be a little stressful to make videos like this). Maybe one day consider testing a Brazilian power supply that is one of the best in Brazil (brand: Spark Usina), I recently acquired one and wanted to know about its quality and if it is efficient and does not waste a lot of energy due to the power factor.
You make great videos. You totally earned all the subs.
Congrats on 100k subscribers
Very informative. Thank you for very detailed explanation. Today i've repaired my LED PSU - one capacitor was blown. It's better to repair then buy new and put broken to trash.
You are great 😁👍. You take so much time, to describe everything, so we can understand and going step by step... OFCORSE we can not forget your trusty sidekick THE CAT 😺.
Everyone, have amazing day 😎💛
Thanks mate, I fixed my broken supply thanks to you!
Velmi zajímavé video. Díky Danyku. 👍
You are the best teacher ever,thanks my friend❤️❤️❤️❤️❤️
You deserve more subscribers:) Keep the great work going here
this is one of your best videos
Best videos out there on switch mode stuff.
Love seeing your cat in the video !
Great video. I use these for ham radio equipment usually 12 volts 50 amps. I had a 24 volt one to at 25 amps. A couple have gone BANG & they were not being over driven. For the price they're good but some are noisy on radio, some not.
Thank you for your time and efforts sir.
You're killing me! :-D I've never seen the both capacitor leads in one hole mistake before! :-O
First time for me also... that is just... 🤣🤣🤣😂😂
man great video. It was interesting with twists in the plot. Great entertainment. You are the real deal.
That was an awesome video @diodegonewild I am trying to learn SMPSs and i like how you measure with an oscilloscope without isolation transformer.
I would like to see a separate video which focuses on finding failures by measuring with an oscilloscope safely. As always I am looking forward to your and your cats new videos :)
Great Effort.Amazing.Thanks a lot for valuable information.
In my 45 or so years of dealing with electronics, I have seen some strange situations..but I've never seen anything like that cap situation. LMAO !!!
Very interesting it was good to see they put the suppresion caps and choke in it so often they get left out so at least they got that right! The error with the little cap having both leads in one hole was totally unaceptable I'm guessing they have no quality control congratulations on 100 000 subscribers that must feel awesome. Finally your cat needs her own channel
Thanks for this great test and teardown with excellent explanation and repair. Its not the first time you see such messy work on chinese electronics. They go for the cheapest workers with little or no experience in electronics and have to work as fast as they can. Probably all done by hand. Still the price is astonishing for the amount of work! Looking forward for the second part. I have nearly the same PSU (12V / 25A) and want to tweak it a little bit. For me output diodes and inductor get the most hot after a while on full load but still o.k.
Except for the singsong ;-) I applaud your productions, awesome in every way and highly educational! Keep 'm coming :D
18:18 Double penetration 🤣😂. LoL seriooooooooously!
Excellent stuff. Thank you so much for your time and knowledge :)
I love the way you fixed that transformer soldering iron. I have dozen of these and they seem to be indestructible apart from the threads in the copper bars that give up after tightening couple of times...must try that
The R1 and R2 across the primary smoothing capacitors are not for discharging them, but for making sure their voltages are divided more evenly as they are in series and their small leakage currents would eventually make them unequal. The resistors basically have a current through them that is a few times larger than the capacitors leakage current, and they act as stiff voltage dividers compared to the leakage currents.
Love you brother ....very good explanation of smps
Keep up the excellent work
You laugh and learn. I love it!!
Excellent! I have one more idea for you to try: that little slope on the primary waveform when transistor turns on is most likely caused by snubber network. It is too agressive, increase R or reduce C. Should be able to gain an additional percent or two for the efficiency.
MrJohhhnnnyyy - One of the other great SMPS brains on TH-cam!
Question sir: What will rewinding that hot output inductor with copper do?
@@kwpctek9190 Doing that will decrease so called copper losses ( it doesn't have to be copper, effectively it is winding loss). Copper has smaller resistance than Al, so the power dissipated on the active resistance of the winding is gonna drop. It is I^2R, by decreasing the resistance in half, you will halve the power dissipation.
@@kwpctek9190 Much more power in this case is dissipated due to wrong amount of turns, which Danyk fixed. By putting too few turns you will get giant hysteresis loss (the core of the choke will saturate, this will be followed by increased ripple on the output).
@@mrjohhhnnnyyy5797 that he did is not proper fix it is just bodge, his fix could easy turn smps in high power oscillator, output indicator affect open loop transfer function of smps and that affect close loop stability, so after changing output inductor you usually need to at least chack stability and sometime redesign control loop.
You are brilliant. Your video is brilliant. Your descriptions are brilliant. Subbed. Thank you for sharing.
спасибо.
I have some reasons to see your videos. Most important, it´s very interesting, it´s easy to learn more about switching power supplies, and further, i like the cat :)
Amazing Video! Nice Work
gratulujem k 100 k subs
An excellent diagnosis. Thanks for the Vid.
Man ur genius and funny 😆.keep up the good work , enjoyed watching your video
By watching him touch components of an live power supply I assume he's a professional.