Modify 12V power supply to 24V 36V 48V

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.
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[@PhdHung]

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]

Sri which risistor?

[@rasikanuwan1039]

Pls tell me

[@AnandKumar-ym9yw]

@@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]

@@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]

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

[@scottmcdonnell7559]

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]

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]

@@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]

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

[@manmeetjammu]

​@@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.

[@user-nt4ki1th6x]

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]

ok

[@user-lh5qn3fw3f]

CONGRATULATIONS Very useful video THANKS

[@zaidhussain5206]

Thank you for sharing this video

[@hakanbaydogmus3450]

ustam sağol varol çok güzel bir çalışma teşekkürler

[@koushiks_energy]

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]

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]

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

[@neodiy]

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

[@koushiks_energy]

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

[@audriuskimtys7943]

Your work is great, thanks for sharing! :)

[@PhdHung]

Thanks, hope you enjoy it

[@sjafarsayyedi8869]

Very good comments on screen. Thanks

[@PhdHung]

[@appatula]

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.

[@rhiantaylor3446]

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]

Thanks

[@Davidslabofficial]

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

[@easytrick3107]

😁👍👍👍👍

[@user-dq7tx7ti6t]

Хорошая переделка. Спосибо.

[@variacoesbrecia]

very good, thanks guy!

[@FernandoLopez-pj6ko]

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

[@pakhuda23]

Thanks sir. God bless u. ..

[@valtersouzaribeiroribeiro9534]

Well done bro

[@shundhem_electrick]

Menyimak informasi menarik, terimakasih telah berbagi ilmu.

[@petersack5074]

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

[@gkdresden]

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]

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.

[@MrYurAlex]

Полезная информация! Спасибо!

[@scamper_van8470]

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

[@jyvben1520]

nack nope, knowledge

[@PhdHung]

:D

[@scamper_van8470]

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

[@richatgo9177]

Mantap, lanjutkan...

[@genezius]

genijalno, super {serbia}

[@shadiabuaalim8190]

Nice project

[@ElectricCreative]

waiting for the next project ❤

[@easytrick3107]

😁👍👍👍👍

[@SolarAddict06]

Good job brother..

[@jeevanshrestha8888]

it's nice keep up

[@anthonynash8079]

Excellent

[@PhdHung]

[@balexfox]

Happy video thank you

[@RayhanAkbar.]

AWESOME

[@Bianchi77]

Cool video, thanks :)

[@salahsyar2210]

GOOOOOOOD THANKS

[@raffaellobottoni871]

Too much easy, my friend!😉

[@joshnabours9102]

How far does the voltage drop under load though?

[@yagzcaner4901]

Üstada çok iyisin

[@mdrizwanansari-fr4xw]

Nice information by using caption thanks ❤❤

[@Edmorbus]

nice work

[@PhdHung]

Thanks bro

[@davidpando7970]

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

[@KHOAIHOANG81]

Very Good...!!!

[@ashiqullah2842]

Good idea. Thank you boss. I am success.

[@scamper_van8470]

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.

[@zymagoras]

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

[@ricardodm9241]

lol eagle eyes!! ;)

[@yenypurwa]

@@ricardodm9241 so, this video is fake?

[@alindinan4634]

good

[@Infinity-electronic]

Nice

[@PhdHung]

Thanks bro

[@ahmetmutlu348]

This trick can help the problems while usimg generator for ews directly

[@newlife6949]

And how limiting Ampers power please?

[@wayansudiasa]

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

[@optimeyes]

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

[@asifehsan4948]

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

[@PhdHung]

ok bro

[@PhdHung]

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: [e-mail] Phone: [phone]

[@hidrogenado1]

thanks dude petty useful

[@eng.knowledgeseeker]

Bravo boss

[@pereira5289]

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?

[@torukojinnn6331]

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

[@lingli314]

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

[@PhdHung]

good

[@viciriucandreea5835]

Ok felicitari

[@dani777dani]

congratulation, you killed the power supply

[@PhdHung]

:))

[@xiro6]

but now he have an adjustable fan.

[@leviahamefula3994]

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?

[@veysitura5560]

I think great job

[@PhdHung]

thanks

[@phuang3]

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

[@PhdHung]

[@MuhammadYaseen-vx5hw]

thanks

[@PhdHung]

[@randallsizemore4406]

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]

👍👍👍👍👍

[@bartdepauw1156]

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

[@Zebra_Paw]

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]

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

[@Zebra_Paw]

@@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)

[@Drxxx]

woow, great project!! i like it

[@PhdHung]

Thanks bro

[@masoudjafarzadeh]

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

[@satreaaji]

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

[@satreaaji]

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

[@officialhonorupdates]

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

[@quanghoang04]

👍👍

[@neodiy]

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

[@yasinravi7443]

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

[@MACYNET323]

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

[@pinokio514]

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]

can use 100 ohm or use IC LM7824

[@gaborgabor1338]

correct

[@shundhem_electrick]

Luar biasa tutorial

[@kdcreativity6201]

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]

no

[@Nappakoutdoorcamp]

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

[@ahmetmutlu348]

But how do you determine feedback resistors... ? Is it goes from out to tl421 adhust pin by voltage divider array ?

[@deepakgarg3262]

What about bias voltage at primary side?

[@AwaisEngineer]

good bro

[@smoke_stackz3168]

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

[@anasory3225]

GOOD BUT MAY BE YOU LOST SOME ADVANTAGES OF SMPS THANKS

[@wrxsubaru02]

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.

[@tacticallithium7831]

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]

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

[@bartdepauw1156]

@@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.

[@ultrainstinct1181]

I did this to a 12v PSU. I let thing I didn't change is change from the 2k to the 1k resistor , is that why it still shows 12v?

[@rafaellalinde3154]

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?

[@Circuiters]

Bro can you make uc 3843 ic inverter circuit

[@fernsgilbert]

Good idea. But Does it still give same amperes?

[@kjyhh]

RIP the fan

[@PhdHung]

:)))

[@omskariyazmaraikayer913]

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

[@mirko5040]

I have 12v 30 ampa psu, I want to have 24v and about 15 amps because the tools will absorb a maximum of 10 amps, so i just replace the resistor with half value and replace filter capacitors with double rated values. Anything else?

[@PhdHung]

no bro

[@mirko5040]

@@PhdHung hello. I replaced the four capacitors with bigger ones, my psu had 16v 3300uf and upgraded with 63v 3300uf there are four resistors near the capacitors each of 2k i tried replacing these with 1,7 and 1k no changes in voltage! At maximum it push always 14.9v no matter what resistor i put! Any idea? I need at least 19v

[@user-em4rj9wj2e]

Mm

[@jaapdijkstra1181]

Do you know how to get more voltage of the sp-240-5

[@qnaman]

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

[@redbaronrefining5322]

Last comment made by this user lmao

[@jjhack3r]

No

[@technology520]

How to adjust current? Would you make a video?

[@wearemilesfromnowhere4630]

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

[@ElectronicsShow]

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 .

[@okadajiiko8773]

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?

[@shubhamsawant5129]

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.

[@settings.9286]

is ot safe to connect the output to get higher current

[@PCbolt17]

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

[@danangarikrisnadi8984]

if I don't change the feedback resistor, what will happen?