I am building a bench power supply. So today I bought two 24V / 10A power supplies. A 36V or 48V power supply is twice as expensive as a 24V power supply . So I bought the 24 power supply and modified it to 36V. The modification is very simple, you just need to replace feedback resistor (in my power supply. it is 2K, I replace it to 1K). Next you need to replace the 35V filter capacitors to 50V or 63V. For a 12V power supply, do the same.

@rasikanuwan1039

3 жыл бұрын

Sri which risistor?

@rasikanuwan1039

3 жыл бұрын

Pls tell me

@AnandKumar-ym9yw

3 жыл бұрын

@@rasikanuwan1039 its a feedback providing resisters. It is basically a voltage divider circut. You will find it as a series connection of more than one resisters connected between output voltage and ground terminal.

@chandruasp

3 жыл бұрын

@@nathanneiman no he used feedback signal w.r.to the signal respective pwm signal will vary which results in o/p voltage variation. Actually this feedback signal required to maintain o/p voltage same during i/p voltage variation and o/p load variation. I have tried the same with PC atx smps but it losses stability so then tried in general 48v Smps its OK fine running well for my bldc submersible pump raised to 72v

@John-vz1wq

3 жыл бұрын

Modifying the secondary winding is better alternative, it does not alter aux. voltage supply to control circuit and fan

It should be pointed out that you will be dropping your current capability by at least half doing this. So you will need a power supply that will be at least double what you need in your final application. If you bought a 12V 10A supply, it is capable of 120 watts. If you modify it to 24V, it would be 5A max because the power supply is still only capable of 120 watts.

@nathana5379

2 жыл бұрын

the components on board are rated by current and voltage, not actual total output power (watts)... The only other thing that might potentially have to be changed or modified is the pulse transformer ( and any component not rated for the volts/current that you are modifying system to)

@zaprodk

2 жыл бұрын

@@nathana5379 Not entirely correct. It's usually the transformer core, switching transistors and rectifier on primary side that is the weak link. If any of those is maxed out, you will not be able to pull anymore without magic smoke :D

@seckinseckin3919

2 жыл бұрын

@@zaprodk changing transformer and switching transistors gives you higher current

@manmeetjammu

Ай бұрын

​@@seckinseckin3919every transformer core has a va rating . Winding is for 10 amp here. But cores do have a VA rating. They will heat up. And losses shall mount after max VA handling and efficiency will degrade as dissipation of heat. You do not want that. He is right in saying you cannot get more VA then rated safely. Momentarily yes. You can get 10 amps from 2 amp rated transformer but in short terms. I have done it practically.

ustam sağol varol çok güzel bir çalışma teşekkürler

Спасибо за очень полезную информацию. Я тоже попробовал переделать такой же блок питания. Я не выпаивал резистор, который вы выпаяли. Я просто параллельно ему припаял резистор 10К и получил 31V на выходе. Также я не трогал заводские конденсаторы, потому что они на 35V. Теперь регулировка напряжения потенциометром на выходе от 26V до 31V. Получилось быстро и просто. Спасибо!

@huseyinsmk

2 жыл бұрын

ok

nice work buddy be careful when working without earth wire i too had a box full of capacitor collection and make sure u check them b4 soldering with esr meter or something

@neodiy

3 жыл бұрын

Good experience sharing...i also didn't notice that in the first place it doesn't have the earth wire...i am worried the box itself could give enough unpleasant shock when using this power supply...

@koushiks_energy

3 жыл бұрын

@@neodiy yes u r rite...i also got a few shocks from the case lol

@neodiy

3 жыл бұрын

@@koushiks_energy That sound very unpleasant power supply to have...especially when there are kids around

@koushiks_energy

3 жыл бұрын

@@neodiy yeah brother its dangerous for children but im still single lol and im an electrical graduate

Genial!!, me ayudo mucho este vídeo para aumentar voltaje a mi fuente de alimentación. Gracias 🙏

Apart from the fan which was not designed for 36v, you should check the dissipation rating of the two resistors in the potential divider you changed - lowering the resistor value will increase the current flowing and the top resistor will also see the increased output voltage.

@skysharksingh

2 жыл бұрын

Thanks

Thank you for sharing this video

Your work is great, thanks for sharing! :)

@PhdHung

3 жыл бұрын

Thanks, hope you enjoy it

If one wanted to avoid having to desolder the 1k resister you could also just solder a 2.2k resistor right on top of the one already in there for parallel resistance of 1047 ohms too.

Awesome awesome awesome video Love it Thank you for sharing this ❤️❤️

@easytrick3107

2 жыл бұрын

😁👍👍👍👍

Menyimak informasi menarik, terimakasih telah berbagi ilmu.

Very good comments on screen. Thanks

@PhdHung

3 жыл бұрын

well you certainly have a neck on how to modify electronics.... well done!! and THANK YOU!!!

@jyvben1520

3 жыл бұрын

nack nope, knowledge

@PhdHung

3 жыл бұрын

:D

@scamper_van8470

3 жыл бұрын

@@PhdHung question tho,how do i increase amps on a power supply?

BEAUTIFULL WORK.....a solder sucker...good for you.....oldtech

very good, thanks guy!

It would be better to use another pulse transformer as well. The change the output voltage by a factor or 1.5 or 2 can drive your controller chip into its pwm limits. So you usually will not get the same output power as for the voltage it is designed for. If you reduce the output voltage you will also not get the same output power, because you need higher switching currents. So the losses of the pulse transformer will increase and you possibly overdrive your rectifier current.

@PhdHung

2 жыл бұрын

When I connect the voltage 170VAC. output voltage is still sufficient. I think when working at 220V. it's still working fine. the maximum PWM limit has not yet been reached.

Thanks sir. God bless u. ..

Хорошая переделка. Спосибо.

Well done bro

dude great video, we want a video increasing Amper of SMPS from 10 to 20 or 30 A . make it soon, respect from Turkey

Mantap, lanjutkan...

genijalno, super {serbia}

Üstada çok iyisin

it's nice keep up

So you set variable resistor to maximum before soldering and after it's back to minimum without you even touching it. Pure magic.

@ricardodm9241

2 жыл бұрын

lol eagle eyes!! ;)

@yenypurwa

2 жыл бұрын

@@ricardodm9241 so, this video is fake?

waiting for the next project ❤

@easytrick3107

2 жыл бұрын

😁👍👍👍👍

How far does the voltage drop under load though?

AWESOME

Good job brother..

Nice project

Too much easy, my friend!😉

Good idea. Thank you boss. I am success.

Cool video, thanks :)

And how limiting Ampers power please?

Полезная информация! Спасибо!

very good sir, please upload next interesting part......................

@PhdHung

3 жыл бұрын

ok bro

Это конечно всё хорошо, но блок при этом из 25в 10а = 250w не стал 48в 10а=480w. Он как был 250w так и остался и нужно понимать что он стал 48в на 5 А просто. т. к. Не изменяя моточные данные трансформатора и его возможности по иагнитопроводу мы просто изменяем коэффициент заполнения в модуляции ШИМ контроллера к большему и тем самым лишаем его возможности компенсировать падение напряжения при увеличении тока при48х5 оно уже будет максимальным. Кроме того еслиб даже домототь на этот трансформатор несколько витков вторички все равно не получиться снять долговременную большую мощность с этого блока т. к. магнитопровод войдёт в насыщение. Там нужно много что менять ключи кондеры по входу, трансформатор, ну и если есть в обратной связи tl, то резистор в его верхнем плече или резистор в цепи оптопаоы, ведь при правильном ззменении повышается только напряжение на выходе, а режимы работы элементов должны оставаться прежними. В этом смысле легче переделывать компьютерные БП ведь там есть запас по мощности и если он был 500w, при 12В на 40а то из него проще сделать 48в на 10а только изменив обмотку и выходные цепи. Правда и там может потребоваться заменить выпрямитплтный диод там часто используют низковрльтные диоды на 100в что мало для блока питания при 48 в выходного всякие испульснве переходные процессы в нагрузке и могут запросто пробить такой диод.

Nice information by using caption thanks ❤❤

Thank you........ Thank you very much

GOOOOOOOD THANKS

Happy video thank you

You removed the old capacitors and soldered 03 capacitors but I realized that 01 was 63 / 1000uf and the other two smaller ones, what is the voltage and uf?

You should also change the output diode as the peak voltage will grow about proportionally to the output voltage! You need 100V diode for 12V, 200V diode for 24V, 300V for 36V, and 400V for 48V, otherwise it will soon fail! The fan needs a buck/boost converter to continue getting 24V no matter the voltage! You can also power it from another power supply (a much smaller one that you isolate and fit into the high power one)

@PhdHung

3 жыл бұрын

yes, the diode is 200v. i think, with output voltage of 35v, it still work fine. I used 7824 for the fan.

@Zebra_Paw

3 жыл бұрын

@@PhdHung 7824 is lossy and the input has to be at least 27V to regulate 24V at the output, so better to use some converter that can regulate 24V from an input voltage between 3 and 42V! I can give you a link if you want! 200V is not enough for a 36V power supply, need MBR30300 (yes, it exists, a 300V schottky diode)

Thank you very much What did you do with the 24V fan at the end? Did you replace it with a 36V fan? Also, with this change, how much the 10A rated current of the device will decrease

Great video, very informative. I have a similar power supply that with the potentiometer goes from 36v - 24v @ 10 amps. Just for a fun project I'd like to modify it to work !3.8v and raise the amperage. Using it for an amateur radio transceiver in mind. Could that be done. Seems like it's sort of the same thing as you did so excelently but in reverse. Thanks for the video.

@easytrick3107

2 жыл бұрын

👍👍👍👍👍

@bartdepauw1156

2 жыл бұрын

I think rewinding the secondary on the pulse transformer will be needed with less turns but with some in parallel. Also higher output capacitors ( more µF , lower max voltage) will be needed to keep the ripple low enough

Hi i finally came around to upgrade the Volts output of my 12V power supply,opened it went to check if pretty much anything was looking good to the point of switching the resistors near capacitors with the following ohm 600 from my right next 1.2 kohm and the last its 2."something" kohm, based on the video i should change the one in the middle,which in my case is the 1.2 kohm, with 1kohm right? or should i change the first which is 600 ohm?or should i change the third which is 2 kohm? If the answer is change the one in the middle would it change anything if i put 1-kohm but slighltly bigger size? Keep in mind that my ignorance in electronics its very high!!!!, One more thing the capacitors 12V i switched were 3300 uF i've put 1000uF 50V,change anything if the Frads are lower? Please if you kindly could answer i would really appreciate it.

Very Good...!!!

nice work

@PhdHung

3 жыл бұрын

Thanks bro

what value resistor would you need to make it work 48v

I need 7v power supply. how to modify 12v to 9v? to decrease voltage, don't you need to replace the capacitor? and what resistor should I use?

Excellent video! Thank you for creating it. Would you happen to know how to vary the current from 0 to 10 amps on one of these power supplies?

@petermuller608

2 жыл бұрын

Those are constant voltage power supplies, thus the current depends on the load. Maybe I'm not understanding you correctly?

@bartdepauw1156

2 жыл бұрын

@@petermuller608 If the load is a high capacity battery, it will draw the current the PSU can produce. Question is : how to (for example) limit the current to half the PSU can produce.

Thanks, will try it, i have many 12v psu, will try to make it 24v to charge my 24v battery pack

@satreaaji

2 жыл бұрын

Udah coba, beda seri 12v, beda resistornya, akhirnya ganti potensio 103, mantab abis, dpt 14,4v buat charge aki 😁

Ok felicitari

thanks dude petty useful

If you like my video, give me a cup coffee. Thank you very much. Donate : www.paypal.com/paypalme/phdhung Facebook group : bit.ly/CreativeElectronic Contact: Magnetron0989821611@gmail.com Phone: 098982161

Excellent

@PhdHung

3 жыл бұрын

Any idea if we change transformer to make it ct for audio?

I saw you that you can adjust it down to 20 volt can you confirm because i need to modify this to power my jigsaw

Luar biasa tutorial

Bro can you make uc 3843 ic inverter circuit

It does work but voltage starts to drop when a load is connected, so it's useless in my case (12V 15A SMPS)

Estimado. Genio. Te consulto. Tengo una fuente de 12v. X 5amp. Y solo da el 5% hacia arriba o abajo. Y necesito llevarlo hasta unos 20v. Que capacitor me recomendas. Y que resistencia. O sea los valores para llegar a eso o aproximado. Gracias por tus videos. Sos un genio. Gracias por tu tiempo

Bravo boss

The main filter capacitors are connected in sieres for higher voltage rating (310V DC on 220AC input). There is no negative voltage here.

@PhdHung

3 жыл бұрын

Looks simple to do, maybe can make adjustable by replacing the 2K with a pot? 😜 Is all SMPS same ? Thanks for sharing 💕

Do you think 8A diode bridge require heatsink?thx 4 video

good

woow, great project!! i like it

@PhdHung

3 жыл бұрын

Thanks bro

What capacity capacitors you removed and what are new capacitor values?

Good idea. But Does it still give same amperes?

Nice

@PhdHung

3 жыл бұрын

Thanks bro

👍👍

Whats the use of the 5w21kj choke you connected permanently on the PSU? Is it safe to remove the output when the input is still connected?

congratulation, you killed the power supply

@PhdHung

3 жыл бұрын

:))

@xiro6

3 жыл бұрын

but now he have an adjustable fan.

Can you do a 12v server power supply to a 24v power supply? I have some HP and Dell ones I want to make use of, so I would like to see how you would do it. Maybe you can solder on some connectors on the pcb of the power supply too so it can be used as a desktop pwr or some other applications.

Amazing video. I'm trying to fix my broken psu. i think I can repair it now.

@redbaronrefining5322

2 жыл бұрын

Last comment made by this user lmao

@jjhack3r

2 жыл бұрын

No

good bro

can it be used for switching 12v 20A, bro?

Nice idea. But It's imp you tell people to rewire the fan with some voltage regulator to complete the video complete. Without that we can't use that high amperes.

Can you make it on HP server supply? and keep the power factor at 94% ? You decrease PF if doing this to get the higher voltage?

@PhdHung

3 жыл бұрын

ok, I'll try to modify it if I find an HP power supply.

bro i upgraded my 12v 5amp smps and its working perfectly but the amps remains same .i mean does it still give 5 amps after upgrading ?

@varythings

3 жыл бұрын

no

My SMPS transistor has some plastic cover attached with thermal paste on it. Should I remove the plastic or should I keep it I am trying to change thermal paste on it so need advice to keep that plastic or just apply on the transistor and touch it to the metel body without plastic

I think great job

@PhdHung

3 жыл бұрын

thanks

Bro can I take a take a similar 24v 2 amp power supply and change it's feedback resistor and make it 40v 2amp and can I do the same with 12v 5amp??? Your really a electronics doctor 🙏🙏

@PhdHung

3 жыл бұрын

Of course, with a 12V power supply, Do the same.

I would like to thank you for the video , and i want some help if you can lead me to where to dig , if i want the output voltage to raise slowly exemple of a 1 volt step , eg 10/11/12/13//14/15 slowly .Thanks .

Good day amd nice video. is the capacitance of the capacitor not relevant? thanks

What about bias voltage at primary side?

Homemade 102 , hello. Can I install any resistor between the red wire of FAN and connector that decrease the voltage to ~24V? Or can’t you do that? Thanks.

@PhdHung

3 жыл бұрын

can use 100 ohm or use IC LM7824

Good video, explains a lot with those power supplies. but ffs how many bells do you need? Do you think your viewers are Pavlov dogs?

the question..it is safe for high load? on 6 or 7amp for 10amp smps...i know if make more vol the amp will be decrease

I use a POT the FB connected right on the POT wiper.

@PhdHung

3 жыл бұрын

good

How to adjust current? Would you make a video?

@wearemilesfromnowhere4630

3 жыл бұрын

I am thinking if you add a multi turn potentiometer in series with the original 1K resistor, you can limit the amps.

How to get higher current 10a to 15a or 20a any modification? By changing the diode output and shunt?

Hello, Great video, I'm trying to modify my power supply to charge some 8S lithium ion batteries i have at 32.6v . If I wanted to make it 32.6v instead of 36v would I just have to add a different resistor? How would i go about calculating that resistance?

Okay you didnt discuss load regulation , but the built is good .

You should replace Shottky Diode too... Because increasing voltage can cause more reverse voltage of Diode.. that can kill the diode...

good day Sir! how about the 5 volts, what should i change to make 12 volts, plz advice🙏🙏

I have studied about switching electronics but not very very deep. You know ? When you decrease feedback resistor, the duty cycle of transistors' driver increase and the output voltage increase too. So what will happen ? Based on topologies you are allowed to increase the duty cycle up to a specified amount and upper that the main transformer will saturate. This is true that you gain higher voltage with this method but it doesn't mean it can be stable under the full load. Consider that in this video the gained output voltage tested under no load. So i'm doubt about it's stability under the full load. I'm not oppose to conver any switching circuit to lower voltage one but I advice to don't convert to higher voltage.

@makoveliprod

Жыл бұрын

In this topology it is usually calculated so that the transformer does not saturate at maximum pwm. Increasing the output voltage simply reduces the regulation range (mains voltage ranges and output current ranges). It will also work even without feedback (max pwm), but absolutely without output voltage stabilization.

What will be the effect on rated amp? Increasing the voltage have to reduce amp to keep the total rated watt same otherwise overheating may cause the rectifier and other components to go bad. How this problem will be taken care of?

@voitano73

3 жыл бұрын

Total power stays the same , so if you step up voltage, max. power supply current will decrease