Higher inductance on the output inductor seems fine but it can make the power supply "sluggish", meaning the feedback loop is slowed down and the output voltage may struggle to ramp up.
You're right, if the inductance is way too high, the responses to sudden load changes are slower. But it still could be mitigated by a suitable PID regulation in the feedback.
It’s not a spin off though. 1:18 the sound is all the capacitors dumping their contents through the transistors to all the inductors and the fans windings making the fan coils vibrate at an audible frequency, slowly using up the remaining power until it’s ran out.
1:18 the mesmerising sound is all the capacitors dumping their contents through the transistors to all the inductors and the transformer windings making the coils vibrate at an audible frequency, slowly using up the remaining power until it’s ran out.
Recently I've bought a 3d printer from a known china brand. The fan failed after a month. I've decided to figure out why. Find the driving IC. It was rated up to 18V (absolute maximum rating). That fan was a 24V fan. My new fan is the exact same thing, but I've lowered the pwn to hopefully have it last longer... When I've discovered why the fan failed i was literally out of mind.
A 12V wall plug supplied with an external Seagate hard disk of mine makes a similar quiet sound (UFO/distant alarm sound) when connected to mains but with no load.
I have 12 volt version of this powersupply, i removed the fan a year ago and the supply still runs my amplifier at 50amps for 3+ hours. The powersupply pulls .5 to 3 amps from then wall socket depending on the load of the amp.
Nice test and autopsy. Its a shame the chinese tend to cheat somehow every time, if its just used parts or fans that are overdriven at 200% or what ever. At least it sometimes works for a more or less short period of time. Yes, try to figure out why the bad gate signal happens. I would guess the fan is also re-used from some scrap part and probably needs lubrication - thats most likely the reason for the bad sound.
I wonder Any advantage between forward converter single switch and two switch ? Recently i'm thinking to design a forward converter for 750W and 1500W and maybe 3000W by using the common MOSFET 20N60 or IGBT FGA25N120 i have . For single switch the transistor need to withstand twice of B+ voltage and need additional coil to reset the core, for 2 switch since both transistor conduct , the conduction loss will be twice? since the voltage split into 2 transistor so the switching loss will be half in each of transistor? Forward converter transformer size is about 4 times larger then half/full bridge topology.. When operate at higher switching frequency such as 10Khz and above in IGBT switching loss will be major loss in total. In malaysia our main is 230VAC which after rectifier about 320VDC , in single switch forward converter the Vds or Vce need to able to withstand twice of B+ which require 640V and above and 20N60 is unable to use for single switch ,so i have to use FGA25N120 which is 1200V . for IGBT it suffer for switching loss especially switch above 40Khz? by using the datasheets curve IC versus switching loss and IC assume 10A the Switching loss about 2.1mJ when switch 40Khz the switching loss about 84W and 10A with Vcesat 2V conduction loss will be almost 104W . When i have time i will try build and try to load and see how it work. I saw your video 600W and 1000W (from autospy your video) both CCA wire in 600W and copper in 1000W both operate at 12A per mm2 density.. for CCA version it fail after 1hours , I really curious for Copper with 12A per mm2 current density will it last? Seen like most of china SMPS they are design in 12A per mm2 , i have try to find any experiment about 12A per mm2 in SMPS power supply how reliable they are maybe need to operate with good air flow? typical low frequency transformer are using 3A per mm2 due to the wire is alot more turn and recently i bought the wire from local electric shop they the wire are rate for 6A per mm2 which use for house wiring.. such as 10mm2 wire they told me can use up to 60A. I bought some transistor from china, there is some fake one, i open up the transistor and diode , i found that a correct size of transistor or IGBT or MOSFET is about 1A per mm2 and for diode is about 2-3A per mm2. i can't find any information about transistor die size versus current.. that just base on my experience after break many of them.
@@simontay4851 That would have to be a massive coil to not saturate at 1000W current and to not get too hot due to ohmic resistance. Cheap supplies found a way around this, though: One turn of big wire around a concrete block shaped like a coil as "fake PFC".
@@fabriziobrutti1205 It seems that EN 61000-2-3 applies for devices above 75W already: The standard itself is not freely available, but check for example these guidelines by the "European Power Supply Manufacturers Association". emcfastpass.com/wp-content/uploads/2017/04/Applicability_flow_chart.pdf In section 3.1, it says: "The standard does not apply to (and has no limits fow): [...] - Non-lighting equipment with rated power of *75W* or less".
The transformer waveform looks like that supply doesn't use the usual resetting diodes for forward converters, but burns the flyback energy in an RCD snubber instead...
He described it in this video: ruclips.net/video/gCI0S3Bcofc/видео.html before you buy it look at the problems with similar model: ruclips.net/video/SIH48bIUU00/видео.html tip - impedance matching : How to measure switching noise on a power supply properly ruclips.net/video/gpwkiJC5hfU/видео.html maybe also for @DiodeGoneWild 9:48
Benefit of this is increased safety when there is smaller distance between live and secondary on board and it also prevents annoying tingling on metalic chassis of powered device, which could be at this power output quite strong
Grounding the negative output to earth shorts any common-mode noise to earth. The whole circuit powered by the secondary side acts as an unbalanced antenna to radiate common-mode voltage. So grounding can improve EMC a lot. It's similar on the input side: Earth provides a nice way to get rid of parts of the HF noise generated by the supply. Some people claim (I didn't check references) that HF emission limits are specified "per conductor" in some regulations. Distributing HF emission over three conductors (live, neutral, earth) instead of just two thus allows for higher total emission to be in spec.
Theese capacitors can be 470uF or even 220uF, and i am 100% sure that they are recycled capacitors with the new fake nippon chemicon shrink tube wrapped on them.
@@tanishqbhaiji103 for instance , i have black and decker cordless drill with 9.6 volt voltage rating but its controller is rated for 24 volt more than double and i have tased it with 19 volt without any problem .
I ve some fake brushless dc fans ( because hall ic drive direct rotor coil instead of drive bjt and bjt drive rotor ) run for few day and die so i only use fan if i saw broard inside fan have bjt (mosfet) to drive coil i will choose use it.
My god the gate transformer core is not recommended for gate driver I don’t use core that created distortion wave the wave most look the same as the ic output
Your fake accent is absolutely charming. You have an excellent command of the English language and the exaggerated accent is so entertaining! I come from the Slavic sector too, so to me the accent is totally alien. What accent do you think you are imitating?
The manufacturer is trying a Photonicinduction with the fan, perhaps? Just not until it pops.
"Another burn in the carpet!"
@@AllLoudNation365Awhh, I popped it
Higher inductance on the output inductor seems fine but it can make the power supply "sluggish", meaning the feedback loop is slowed down and the output voltage may struggle to ramp up.
You're right, if the inductance is way too high, the responses to sudden load changes are slower. But it still could be mitigated by a suitable PID regulation in the feedback.
@@DiodeGoneWild you are a genius!
The cat always knows best :-) Despite the danger, its tail shows how exciting your power supply test was!
this is the funniest cat has EVER been, usually bored.
Mesure the voltage on the fan when it's plugged in. It may just have a series resistor or some simple CC regulation
Don’t think so because a 4w fan wouldn’t have been that loud
A 12 V, 0.15 A fan is nowhere near that loud
The fan's spin off sound is like a sound effect from an old cartoon in my country.Called Mézga family.
MZ/X
@@P.O.S.S.I.M. mindössze 16 másodperccel voltál gyorsabb. :D
Ott a pont :D
It’s not a spin off though. 1:18 the sound is all the capacitors dumping their contents through the transistors to all the inductors and the fans windings making the fan coils vibrate at an audible frequency, slowly using up the remaining power until it’s ran out.
@@WELLINGTON20 Thanks for the professional explanation.I only focused on the sound.
1:18 the mesmerising sound is all the capacitors dumping their contents through the transistors to all the inductors and the transformer windings making the coils vibrate at an audible frequency, slowly using up the remaining power until it’s ran out.
I'm always amazed how horrible some of these designs are, and how these products barely function; but yet they still kind of, sort of work...
"they still kind of, sort of work..." - Yeah, most of the time that's "good enough" anyway...
Your genius hurts my brain. But I love the pain. You rock, Mr. Diode!
Recently I've bought a 3d printer from a known china brand. The fan failed after a month. I've decided to figure out why. Find the driving IC. It was rated up to 18V (absolute maximum rating). That fan was a 24V fan.
My new fan is the exact same thing, but I've lowered the pwn to hopefully have it last longer...
When I've discovered why the fan failed i was literally out of mind.
I love the new lighting you have set up, it's very evenly lit and everything's easy to see.
its 4am here now but its dgw im going to watch it first
0am here but i also watched it
Finally, Veritáska 🐱 shows off her athletic abilities!
A 12V wall plug supplied with an external Seagate hard disk of mine makes a similar quiet sound (UFO/distant alarm sound) when connected to mains but with no load.
Nice review mate 👍 and rip for the cooling fan xD
Can't wait for the autopsy, especially the transformers!!
Nice job, you are turning into my favorite you tuber for electronic content
Looking forward to the autopsy video.
Very interested to know if they used aluminum wires instead of copper.
Yees, konečně další video 👍
Thanks a lot GRAND MASTER.
Blady hel! Enadr epizouuuud!
The weird sounds at the start are a cool detail.
Amazing how it works well !
Hi!
Please press the 'FFT' Button to compute and display the spectrum. ;)
Reminds me a lot of LTspice 😂😇
1:15 and 1:45 I feel like I'm on the beach listening to the seagulls and the ocean waves
At last,your kitty came out,nice!
Incredible loud noise from that 12V fan at 24V 🤣
Sounds like a server fan :D
soooo that is why server fans are so loud 😂
@@lordred7462 🤣
Dbl the voltage quadruple the power! ...and probably ratio of noise increase by cubed 😂
I have 12 volt version of this powersupply, i removed the fan a year ago and the supply still runs my amplifier at 50amps for 3+ hours. The powersupply pulls .5 to 3 amps from then wall socket depending on the load of the amp.
Mohl bys ten ventilátor napojit na 12V abychom slyšeli rozdíl v hluku, celkem mě to zajímá
Helpful video
we wait next episode
:)
finally the testvideo
Great video
4:34 😄 😄 Thanks Mr DGW ☺️
Sounds like a bird tweeting when shutdown.
Conclusion: DODGY! 💀
I want to see the cooking series of this 24v1000w. Without the fan with your heater..
Nice test and autopsy. Its a shame the chinese tend to cheat somehow every time, if its just used parts or fans that are overdriven at 200% or what ever. At least it sometimes works for a more or less short period of time. Yes, try to figure out why the bad gate signal happens. I would guess the fan is also re-used from some scrap part and probably needs lubrication - thats most likely the reason for the bad sound.
Brother, how about when the PSU turns on but shuts down when over about 25% load?which part is failing?
I wonder Any advantage between forward converter single switch and two switch ? Recently i'm thinking to design a forward converter for 750W and 1500W and maybe 3000W by using the common MOSFET 20N60 or IGBT FGA25N120 i have . For single switch the transistor need to withstand twice of B+ voltage and need additional coil to reset the core, for 2 switch since both transistor conduct , the conduction loss will be twice? since the voltage split into 2 transistor so the switching loss will be half in each of transistor? Forward converter transformer size is about 4 times larger then half/full bridge topology.. When operate at higher switching frequency such as 10Khz and above in IGBT switching loss will be major loss in total.
In malaysia our main is 230VAC which after rectifier about 320VDC , in single switch forward converter the Vds or Vce need to able to withstand twice of B+ which require 640V and above and 20N60 is unable to use for single switch ,so i have to use FGA25N120 which is 1200V . for IGBT it suffer for switching loss especially switch above 40Khz? by using the datasheets curve IC versus switching loss and IC assume 10A the Switching loss about 2.1mJ when switch 40Khz the switching loss about 84W and 10A with Vcesat 2V conduction loss will be almost 104W . When i have time i will try build and try to load and see how it work.
I saw your video 600W and 1000W (from autospy your video) both CCA wire in 600W and copper in 1000W both operate at 12A per mm2 density.. for CCA version it fail after 1hours , I really curious for Copper with 12A per mm2 current density will it last? Seen like most of china SMPS they are design in 12A per mm2 , i have try to find any experiment about 12A per mm2 in SMPS power supply how reliable they are maybe need to operate with good air flow? typical low frequency transformer are using 3A per mm2 due to the wire is alot more turn and recently i bought the wire from local electric shop they the wire are rate for 6A per mm2 which use for house wiring.. such as 10mm2 wire they told me can use up to 60A.
I bought some transistor from china, there is some fake one, i open up the transistor and diode , i found that a correct size of transistor or IGBT or MOSFET is about 1A per mm2 and for diode is about 2-3A per mm2. i can't find any information about transistor die size versus current.. that just base on my experience after break many of them.
waiting for your next video😍😍
Is that fan's housing broken as well ?
You win my subscribe dude
Holy shit. 1kW and no PFC... I'm pretty sure u need PFC above 75W to sell it anywhere in EU.
That’s exactly what I was wondering during the whole video
China doesn't care. You could add a large coil in series with the input for some passive PFC.
@@simontay4851 That would have to be a massive coil to not saturate at 1000W current and to not get too hot due to ohmic resistance. Cheap supplies found a way around this, though: One turn of big wire around a concrete block shaped like a coil as "fake PFC".
Actually it's 150W the limit, anyway, that's illegal :)
@@fabriziobrutti1205 It seems that EN 61000-2-3 applies for devices above 75W already: The standard itself is not freely available, but check for example these guidelines by the "European Power Supply Manufacturers Association". emcfastpass.com/wp-content/uploads/2017/04/Applicability_flow_chart.pdf In section 3.1, it says: "The standard does not apply to (and has no limits fow): [...] - Non-lighting equipment with rated power of *75W* or less".
Powering a 12v fan with 24v. What could possibly go wrong?
Nothing, apparently
@@arthurmead5341 Oh, plenty can go wrong.
11:54 hahaha Nipon Chemi-con 105C capacitors in cheap Chinese PSU :D yeah right
And there is no way they are 1500uF either. They would need to much bigger for 250V.
Keep it up!
🐈🐈Cat's Name :- Veritàska
😄
The transformer waveform looks like that supply doesn't use the usual resetting diodes for forward converters, but burns the flyback energy in an RCD snubber instead...
Maybe they used shit normal diodes instead of high speed reverse recovery diodes with lower drop?
Şahanesin, tebrikler
0:38 that fan sounds same as my ps4 fan. x'D
Hi master would you please make a video about isl6549 ic how its work
The inducator reduces the life of capacitor or increases it
Increases
@@tanishqbhaiji103 if it's a higher inductance it will increase their life, otherwise decrease it of course
Yes 👍 🔌
Can you please share the DSO details..
I wanted to buy it for my experimental studies..
He described it in this video: ruclips.net/video/gCI0S3Bcofc/видео.html
before you buy it look at the problems with similar model: ruclips.net/video/SIH48bIUU00/видео.html
tip - impedance matching : How to measure switching noise on a power supply properly ruclips.net/video/gpwkiJC5hfU/видео.html
maybe also for @DiodeGoneWild 9:48
I think the fan just has a resistor connected in series
sweet cat [4:33]
what's the advantages to put the - to earth? and connect capacitors to earth too? i don't understand.
Benefit of this is increased safety when there is smaller distance between live and secondary on board and it also prevents annoying tingling on metalic chassis of powered device, which could be at this power output quite strong
@@DB-47 also the benefit of doing that would it improve the quality "or performance of the" - "in the circuit? I mean we would get a better" - "
Grounding the negative output to earth shorts any common-mode noise to earth. The whole circuit powered by the secondary side acts as an unbalanced antenna to radiate common-mode voltage. So grounding can improve EMC a lot.
It's similar on the input side: Earth provides a nice way to get rid of parts of the HF noise generated by the supply. Some people claim (I didn't check references) that HF emission limits are specified "per conductor" in some regulations. Distributing HF emission over three conductors (live, neutral, earth) instead of just two thus allows for higher total emission to be in spec.
@@tw11tube ho ok thank you for your replies guys ! i understand better now 👍
F in the chat for the poor cooling fan.
The capacitors are defenetky fake, 1500uf Also seems to high for the dimensions.
Even high end ATX like Corsair AX1600i don’t come with nearly that capacitances so they are very very likely to be fake
Theese capacitors can be 470uF or even 220uF, and i am 100% sure that they are recycled capacitors with the new fake nippon chemicon shrink tube wrapped on them.
Try to rin it a bit longer WITHOUT the fan to simulate it's failure. let's see what happens.
That's not Fan Spin (Louis Rossmann), this is Fan Spin!
Maybe this model is actually really 1000W… The case is the same as a 600W model (a real one, the last one was a 360W model).
@Samuel yes, me too, but the size of it suggests a 360W model.
Dik za video (;
What is the name of the ic used
U are the best ❤
1:35 ha! Almost like GunieaPig
2:44 may be controller of the fan is rated for much higher voltage than fan itself ...
Don’t think so because they would have rated the fan 12-24v
@@tanishqbhaiji103 i have seen many devices with voltage rating much below than its maximum handling capacity
@@tanishqbhaiji103 for instance , i have black and decker cordless drill with 9.6 volt voltage rating but its controller is rated for 24 volt more than double and i have tased it with 19 volt without any problem .
@@omsingharjit that’s not usually the case with cheap stuff
sounds like halo combat evolved 343 guilty spark mission background music exactly same
nice
I expected to find PFC stage at this power rating
I ve some fake brushless dc fans ( because hall ic drive direct rotor coil instead of drive bjt and bjt drive rotor ) run for few day and die so i only use fan if i saw broard inside fan have bjt (mosfet) to drive coil i will choose use it.
My god the gate transformer core is not recommended for gate driver I don’t use core that created distortion wave the wave most look the same as the ic output
so there is little car alarm in fan
What's the Name of the Superstar-Cat?
Nervous Nelly...;=)
That fan lived already too long IMO, may be mislabeled.
Cool..picked up Aliens..
Your fake accent is absolutely charming. You have an excellent command of the English language and the exaggerated accent is so entertaining! I come from the Slavic sector too, so to me the accent is totally alien. What accent do you think you are imitating?
1:50 it's sounds like ufo !!!
It means you have seen ufo before !!!!
8:02 gate driving disaster , isn't it ? :-)
No explosion that's strange
Russian ghost in your smps 😂😂🤣🤣
You should drop the fan to 12V and see how long it lasts - lol -.
Power a ZVS driver with that
Test the fan voltage under load it will probably be closer to 12v. It measures 24 as it is driven by a resistor from 24v
Ufo 😂😂😂😂
Like rain forest, frogs calling rain 🤣
IT seems UFO i think
Sounds like a seagull stuck inside
I stupidly bought one of these. The entire purchase and product was slimey......very sketchy
Darn.....you would be much better off buying a used server psu. At least they are built with quality components, and are very cheap.
Hi
More salt.
X-files music......
Bloody helll😂😂😂
lol sounds like a fucking hairdryer
You should test it under water to see if it complies with EU waterproofing regulations.
Good grief lol
Whoever designed this PS, was a complete noob in thermal design and pcb layout.
I wouldn't pay $1 for a junk like this.
A fountain that leaves a lot to be desired, I don't even want it as a gift 🤮 garbage
Damn. MEGA dodgy
Is this a real accent or just an American trying to sound foreign?
👍