Teardown on Mean Well LRS 350 24
HTML-код
- Опубликовано: 13 янв 2020
- Lets take a look what is inside of Mean Well 350 24 power supply.
Curios to see how it' s built and make sure this is not know -off
Prices and availability: amzn.to/30ikjO2
Detailed photos and specs: mobilemodding.info/mean-well-l...
#meanwell #3dprinting #powersupply 
Наука
The 1252I you mention is an NCP1252 current mode controller. The two 200 V caps in series are right next to the voltage selector switch and the circuit around the switch is called a voltage doubler circuit...Maybe next time when you review the internals of an SMPS make sure you understand the topology and circuit.
Thank you for watching. I agree, and I dont claim I know. And thank you for all the comments as I learn by making videos. My next smtp video woul be better ;)
Thank you for the teardown video. I have the same model, and I was freaked out by the silicone goop on the circuit board, but it is good to see that it is part of the manufacturing process, and is not a component failure.
You very welcome! And I appreciate the feedback. What are you planing to use it for?
It 's very interesting . Thanks a lot .
You are welcome !
Thank you for showing the inside of this thing! I think mine was a lemon and almost burst into flames so seeing how it is supposed to look on the inside is helpful. I'm still mot sure what was smoking and popping, but this we helpful in knowing what was supposed to be on the inside.
Mind you, mine was powered recently so I'm not taking the board out of the case to check the bottom. I'd rather not get a big ol' shock.
Oh wow, any proper power supply should not burst in flames. It shoul have protection from any short, overvoltage and abuse. Unless it was damaged or something. Does it still have warranty?
@@InsideOutElectronics Yeah, I just got it. Getting a replacement now, I'm pretty sure it was just a lemon part as everything else on the board is fine.
thanks for the video!
Thank you for watching!
ขอบคุณมากครับ สำหรับวีดีโอ และวงจร❤
thank you for the video
Sorry bro accidentally removed your previous comment!
This powersupply has protection from shorts, So at least you can check the fuse in there - ruclips.net/video/Rk9B8RT26Ug/видео.html
@8:01 The main HV capacitors are rated at 200V but when you switch the input to 230V they work in series -> the voltage is divided between them, so its well below their specs.
Thank you for explanation!
Great video good sir! Knowledgeable, clean video and audio, and useful info! Keep up the fantastic work!
Thank you, I do my best!
Nice video
Thank you!
@insideoutelectronics Exactly what i was looking for! I'm trying to replace the clamping diode on ZNR5 at 7:45 but i don't know which specs it has, can you recommend a replacement for this? It's from my ender 3 v2 which was on 115V and not 230V as it should but the board is fine.
Do you know what was installed there originally? Model? You can use websites like this to find appropriate replacement - www.mouser.com/Circuit-Protection/Varistors/_/N-5g3h?P=1z0z63x
same, I was on 130v on my ender 3 pro, then it came out with white fumes
I’m looking to replace the fan - could you confirm that the fan connection (CN101) outputs 12v rather than 24v
I cannot dissembled this using at the moment, it is being in use for 3D printer. But here it clearly indicates 12V, ruclips.net/video/Rk9B8RT26Ug/видео.html I
what kind of size of Allen wrench do you need to use to attach the box to the frame of a. 3d printer?
Depending on used screw. I use philips head screws. So no Allen wrench needed
Great test, thanks. Would it be worth paying twice the price for rsp-320-24 for someone who won't use extra remote connection and don't need high inrush current handling?
Thank you for watching, I do not think it wort paying more. Unless you will be running all the time high current via long wires.
hello, would you happen to know the ohmic value of the voltage adjustment pententiometer ( 24v) or the reference. thank you.
Thank you for watching. According to this schematic - mobilemodding.info/mean-well-lrs-350-24v-teardown/
it is 2K
But mine being used right now so I cannot take it apart at this time.
Thank you very informative video! I’ve been thinking about using arduino, a mosfet and thermoresistor to controll the speed of the stock fan. Where would you say the best place for the thermoresistor to be?
Thank you for kind words! I think it is overkill to use microcontroller for this, also it is already temperature controlled - when temp is up fan kicks-in. What exactly you want to achieve?
@@InsideOutElectronics Yeah maybe overkill but i like doing these kind of things lol, as is now fan runs 100% or 0%. Id like to have PWM controll so that fan starts at 30% at 30c and increase linear to 100% at 70c. All to make it quieter :)
@@oscarsjolund9672 SO if you want to do this, you can consult schematic on my website - mobilemodding.info/mean-well-lrs-350-24v-teardown/ As far as I remember thermistor located is near or at ) the output inductor ( L100 )
@@InsideOutElectronics Thank you for taking your time, very helpful!
For the output - there are three positive and three negative terminals. Do those share a single rail? I want to get one of these, but it needs to power 4 devices. The power supply is rated for the power draw from all four. One thing mentioned that I didn't think about - I need to make sure I get one that regulates itself under load.
Both 3 terminals are wired together. It will regulate as long as load does not exceed 350W .But I would not push for 100% load and stick with 80% for example and leave gap for extraordinary scenarios .
@@InsideOutElectronics 100%. My actual needed load maxes out at 240. So the last 110w is my overhead.
@@jeffrbake Very good
Hey man, i have a meanwell power supply with no stickers or,anything, im trying to reorder it because it blew. I saw your pcb says "LRS-350A-R7." Yours is a 24v. Mine has "LRS-350A-R6" printed on it, do you know if that is the 12v? I cant find an image of the PCB anywhere to compare and this is the most in depth ive seen of it.
No, it is just a revision of the PCB, The same PCB is used in 12, 24V and so on, components on them are a bit different though.
You have to look for specific voltages or model number of that PCB
Nice informative video. I have a couple of questions for you.
I have one of these in my Creality Ender 3 Pro 3D printer. It has been a good supply, but every so often the stepper motors will run really slow. The only way to fix it is to cycle the power supply off and back on. It does not happen very often, but it has done this on two different control boards; one an 8-bit board and the other is a newer 32-bit board. Do you think it is a power supply issue?
My second question concerns the fan. I saw another youtube video saying that the 12v fan is actually running on24v, Do you think that is true or is the 12v coming from the center tap of a transformer?
Thank you for kind words !
IF only ONE motor is slow this mean that stepper driver is overheating or overdriven !
Can you swap motor with another motor and test ?
I do not think so - judging by a schematic
mobilemodding.info/mean-well-lrs-350-24v-teardown/
it runs at 12V ( on 24V power supply )
@@InsideOutElectronics It is not just one, all directions are slow when it happens. It does not happen very often. I can go weeks even months before it happens again. I might see about getting some better quality steppers though. Thanks for the schematic. It might come in handy.
what kind of screw is the one for the wire terminal? i don't know how to buy the right terminal. I checked the manual, but it didn't tell this.
Looks like m4x5 i do not have access to it at the moment.
do you know of any troubleshooting for this? mine has no output voltage. its set at 230V (which is correct for my case) and the fuse is fine
Troubleshooting switching PSU is a bit of challenge for me... sry
Same, i have the 12v version. No output voltage
Mine as well
Thank you for this cool video! I'm about to replace te fan by a Thingiverse cover with a giant 120 mm Arctic Silent fan - not audible running at 800 rpm. The air flow of that big fan is way higher than of the small 60 mm stock, but due to the low rpm the pressure is lower. So I would like to measure the temp somehow to see if the fan's flow is strong enough to cool the power supply down... is there a way? Which component measures the temp to switch the fan on and off? One alternative is to place a sensor in and do comparison measurements, but is there an easier way? If it works, I can only recommend that huge fan. Absolutely NO noise, not at all!
Great idea! I will try doing the same
@@InsideOutElectronics Where can I modify to keep the fan on? please. Thank you
@@lancereyesromero7811 2 ways.... replace fan for 24V and connect it straight to the PSU output, or fiddle with the thermistor ( bypass ) on existing fan control circuit (12v) to make it work always.
@@InsideOutElectronics sorry for the noob question but where can I find the thermistor?
Any good reason why this 24v supply uses a 12v fan?
The only explanation I have that is to have same fans across different models ( not sure what fan they put into 3.3V and 5V models though )
cooling fan doesn't work supply 3v in place of 12v witch components faulty?
There is small voltage regulator just nearby the fan connector
Hey I smoke this thing up and when I inspect I see liquid near those two primary capacitor. Is my psu dead or can be repaired.
Not supppse to be any liquids nearby caps. Hm, does it have any water damage?
@@InsideOutElectronics no it doesn't
Приветствую!! Сейчас подбираю БП для станка с чпу. Ориентируюсь на 24 вольта, 10-15 ампер. Подскажите, по схемотехнике этот Минвелл такой же, как и noname china LED бп, грубо говоря? Минвелл то я смогу купить, но стоит ли если он по схемотехнике такой же, как и LED china psu...Какие есть "подводные камни"?))
Я думаю что лучше ! особенно учитьіваю что LED PSU скорее всего будет constant current. Для номальной техники которая стоит в разьі больше чем блок питания я думаю надо брать MeanWell. Проблем именно с єтин не наблюдалось. Используеться для 3D принтера
Those 2 big caps are 200v series.so overall voltages is 400 volt.This is basic to know
I should put text overlay, yes you are right and I did not clued it at first.
Hi, do you know the NTC Thermistor value at 7:15?
Thanks
No, but i have full schematic on my website, link in description
Good reference video to compare against fake versions of this power supply...
Thsnk you
Can this model connect in series. Is the output isolated. I need an application to get 48v. 24v from solar panel and series to mw LRS350-24, to run 48v dc motor.
Probbaly, not sure. But is int it better just to get 48v version ?
Oh sorry, 24v from the panel plus 24 from the PSU? It might now work because of the current draw will be inbalanced.
Why does the fan not working when I energized the ls 350
Fan only working when it heats-up, only when needed. on low loads it will be quite ! Which is great
@@InsideOutElectronics from now on I will watch your videos and ask you whenever I need to ask something, , ,thank you
Hi, could someone say me if the fan in the power supply is pushing air outside of of the box or pulling air fresh inside to the electronic cars until vertical air vents ?
pushing out, which is how it should be
@@nipunagunarathne4882 When in the video "inside out Electronics" open the box, i see the data about the fan facing inside that means it is pushing air inside, no ? Could someone test it placing a paper in front of the fan : if paper stick it means it is pulling air inside ...
The fan is blowing fresh air in. Normally the output is the side of the label.
simple test. Start printer let the psu fan run and take a piece of small paper. Put it near the fan and see if the paper gets sucked up to the fan or pushes the paper out. Just tested it on mine and its blowing air on to the components of the motherboard.
Hah, my printer does not use enough juice to kick-in the fan :) I have to load it I guess.
Does the Fan turns on when it gets Energy, because mine doesn't?
Fan turns on only when is under load and transistors are heated up
@@InsideOutElectronics okay thanks!
My ender 3 psu is dead because the MOV has exploded. By any chance, can you recommend me one (what specs ?) to replace it ? I will have to check the fuse. The ender 3 psu is also 24V / 350W.
Is it fixable? Do you have heated bed?
@@InsideOutElectronics Yes I think, the other components seems fine. Yes the bed is heated.
@@didtoknan8128 Well try replacing MOV then. Probably it was over voltage event in your mains
Those 200v caps are in series for 240v oparation. And the 120v/220v selector sets them to capacitor doubler mode with the bridge rectifier diodes for 120v oparation which boosts the voltage to 390v.. if this psu had active power factor correction this section would have been omitted and a 450v capacitor should have been given cus the apfc can boost the mains voltage to 400v .
Thank you for explanation!
I want to power my raspberry Pi 4, with 5V 3A(15W) power supply SMPS, can i do it without using raspberry Pi official power supply.
I will be using RS-15-5 mean well SMPS.
Yeah, this should work
HI ! thank you very much for your very interesting video I have a 320-24 model. The fan turns on immediately when the power supply is connected to the mains The noise is too much Am i using it to power an audio stereo amp Is removing the fan safe ? is there a way to tame its noise ? Thanks a lot, gino
You are welcome, does fan turn on when you just powering it up without any load?
Also what exact model are you talking about
@@InsideOutElectronics hi yes it stays on continuously
@@InsideOutElectronics hi thank you for the very kind reply My model is rsp-320-24 i wonder if using a 24v fan rotating slower can help or a more silent fan
You can put 12v fan, or put a resistor to reduce voltage. I have also es 420 24, And this one turn the fan with no load as well. Very annoying 😒 but I can tolerate because 3d printer generally is lauder.
Hi, can you tell me what is the J6 jumper? It broke in my PSU and I don't know if it's just a jumper or any kind of diode because it doesn't react like a diode... Thanks
It looks like jumper link with ferrite bead, to cut down some EMI. Technically it just piece of wire.
Подскажи, пожалуйста, вентилятор шумный? Думал использовать для питания светодиодной ленты.
Не знаю! Мой 3д принтер никогда не нагружал бп так чтобьі включался вентилятор. лол.
А лента с регулятором тока? Етот бп не есть constant current.
@@InsideOutElectronics А, то есть он под нагрузкой только включается, это хорошо) По поводу тока не совсем понял. Ленты обычные со встроенными резисторами, к ним драйвер не нужен, должны питаться от обычного бп. Ну я не шарю в электрике, поэтому может неправильно думаю.
@@Maxm1T если ечть вчтроенньіе резисторьі то все ок! Да вентилятор іклбчается только под нагрузкой когда транзисторьі нагреваются
@@InsideOutElectronics спасибо!
From outside, it looks a lot like the Chuanglian A-350FGF-24. I wonder if the components are identical too. I hope not.
Do you have Chuanglian? Will be interesting to compare
@@InsideOutElectronics I probably have one in my Anycubic Vyper. I'll let you know if I open it.
Excuse me,can we joint this with car battery to start car engine
Thank you for watching, but no, this is 24V not 12-13 like in the car
8:11 learn how switching power supply works and then you will know why 200V caps work. they are connected in series so they together can handle 400V and that covers 230V*sqrt(2)=324V which is the voltage they work when you have 230V in the wall.
Thank you, I have already read up on that thank to this psu teardown.
I dont know, why dont they use plastic body to avoid hazard due to metal body?
@@MrNams metal body's tend to be safer, the metal body tends to be connected to ground
if there is an accidental short or loose wire from mains and it comes into contact with the metal body it will trip the fuse
When you select AC110v .only one capacitor works.
What is Q122 component at ruclips.net/video/Rk9B8RT26Ug/видео.html ? I accidentally broke the tip of it while replacing fan, and my Ender3V2 reboots after getting some temperature. Is that component easy to replace?
This is 12V voltage regulator for the fan, your PSU reboots because it overheats
Never mind my previous answer, this is actually switching transistor 2SA562 !!! Check schematic - mobilemodding.info/mean-well-lrs-350-24v-teardown/
Привет. Я хочу им заряжать литий ионный аккумулятор, настрою напряжение какое нужно резистором, но вот если ток потребует больше заявленной мощности он уйдет в защиту или ограничится ток? Возможно надо будет дополнительно использовать мощный резистор для ограничения тока
Привет
Тако блок не подойдет для зараядки акумов, надо неного поумнее устройство с контролем тока и отключении про достижении определенного тока. ИМХО
@@InsideOutElectronics Спасибо за отклик ✊
@@InsideOutElectronics На умных зарядках он поэтапно токи даёт. Сначала какими то миллиамперами чтобы вытащить из дна, затем идёт этап с ограничением максимального тока, а в конце батка снижает ток приёма, когда достигнет миллиамперы cut off. Я могу заменить резистор в этом БП подкорректировать напряжение с 12 на 8.4 вольт, а ограничить ток тоже надо будет чтобы бп не ушла в защиту, а для аккума слишком большого тока не будет, там ёмкость 120 Ампер. Модуль или бп специальный не нашёл короче 😅😂
This one is in half bridge configuration that is why there are Two 200V rated filter capacitors at the primary high voltage side .. They are in series ... and the Switching pulls power from them one by one ... ... That's pretty much what you will see in a ATX power supply ...
Got it !
Thanks I needed to compare my newly purchased PSU to check its genuine and it was. Thanks
Thank you for watching ! I'm happy it was useful :D
is the fan header 12v?
The reason I ask is that 12V fan runs like a jet engine, maybe they are running it at 24V?
I can measure, but fan is 12v. If they take 12v and run it at 24 it certaily would die
@@drozcan Doe the fan runs all the time or just under heavy load in your case?
@@InsideOutElectronics just under heavy load, I'm using it in a 3d printer so when it starts to heat up, fans kick in
@@drozcan Thank you, my load is not so big at the moment
The voltage is rectified and passed through a transformer prior to getting to those capacitors which is why 200v caps are just fine. Na Zdrovie!
Thank you, I probably need to make overlay to mention that!
Какой максимальный вольтаж выдает в реале, можешь измерить?
Викрутив подстроечник на максимум ? если ничего не крутить - 24V
@@InsideOutElectronics да, интересно можно ли получить 28в без доработок.
Cost
Of what ?
what a f.. are you talking about? So is it good or not?
It is f..ery good, buy it ! :)
Слышно русский акцент, как бы ты не старался подражать
Хаха, дьік не подражаю, разговариваю как умею...
Вот да, тоже прям аж внутри переворачивает, когда слышу вот этот закос под "accentless english", в то время, как русский говор даже без звука слышно. Перед кем выёбываться только своим якобы "флюинт инглишем"? Говорил бы уж нормально, с нормальным своим акцентом, как это делают неанглоязычные блогеры. Но этот закос, о господи... 12 секунд. Ровно на 12 секунд меня хватило этого видео, хотя жаль. Тема интересная. Но не могу я слушать вот эту попытку выпрыгнуть из штанов, чтоб звучать, как "нэйтив американ"... 🤦♂️
@@InsideOutElectronics да всё ровно,
Opening the case and not immediately discharging the two huge capacitors marks the presenter as an amateur, and the subsequent commentary confirms this. This video demonstrates inappropriate and dangerous procedures and should be ignored.
Those caps are in series😂
@@potassiumchloride6968 Now I know, my mistake of course.