{512} Why SMPS Fluctuates / Reasons for SMPS Output Voltage Fluctuation Switch Mode Power Supply

[@manojp6641]

Good...but intentionally u r take more time to explain same matter

[@HaseebElectronics]

thanks dear. it is my problem. that I cannot explain in short words. if someone thinks that it is time consuming or useless, he must not waste his time. because I try my best to explain in detail. so conveying something in some understandable format it takes time

[@ministeriomundialliberando8403]

​@@HaseebElectronicsTo comprehend this matter there must be a passion for the teaching: he who has it try to explain in best possible way regardless the time.

[@HarlavanisPanagiotis]

Excellent upload dear friend, have a happy weekend!!!

[@michaelmcsky]

Thank you, you solved my broken SMPS. The device was always restarting. First I tested the sec. unit. No failed components. Then I measured the start up supply cap in circuit (47uF 25 V rated). I got 45 uF. So I tought it would be ok. Then I measured the voltage on start up cap. it was drifting around 7 V. After desolding the cap I check it cap with a ESR Meter. Resistance was over 6 Ohms!. So I replaced the start up cap (new cap resistance < 0.5 ohm) , now it works.

[@ahmedmadkour]

Very beautiful work my brother 😍 give you big 👍

[@بهزادخلیلی-ظ9ج]

Hello and do not be tired, Engineer Thank you very much for the Persian translation and I ask you to keep the Persian subtitles active in the next videos. Thank you very much for your good and efficient training videos. I follow all your videos from Iran

[@HaseebElectronics]

welcome dear brother I am trying to share in different languages so that it may be helpful but I am afraid that I get translation from Google translator, so sometimes it make different meanings for some wordsbut I think it will give the closest understanding to the viewer as he is reading and watching practically, so if there is some error in translation but he can understand it nicely best wishes السلام عليكم ورحمة الله و بركاته

[@AnjanaPanchalFamily]

Helpful sharing 👍

[@susantaatha6468]

Speech less explain for SMPS Many many thanks 💗.

[@sarakhan7459]

Waoww nice informative video thanks fr staring

[@vlogdiaries4u]

Excellent information...masha Allah you are doing an amazing work. Keep it up and keep growing. Lots of prayers for you.

[@villagewallybachay2]

جی ماشاءاللہ نائس بہت اچھی ویڈیو زبردست

[@BhajanShradha]

Superb video 👍👍👍👍

[@ShumailaKiDuniya]

Mashallah excellent information very nice sharing

[@boybravo689]

I watch again and again and i undertand what causes of the problem of smps voltage fluctation in the output and the vcc capacitor tnx for this video sir

[@HaseebElectronics]

it is my pleasure best regards for your valuable comment

[@singarsaleembalchani4130]

ماشاءاللہ ماشاءاللہ ماشاءاللہ ماشاءاللہ بہت خوب

[@janasmeal7916]

awesome informative lecture keep it up

[@itsme...5106]

My tester glowing on output terminal. Is it work like that. I cheeked another smps it also glows tester can you explain why. Its ok when earth is connected.

[@hiralifestyle]

lk bro very helpful sharing

[@ukabalwadi]

شكرا لجهودك وبارك الله فيك وجزاك الله عنا كل الخير

[@kuchpanktiyajindagiki]

Great upload as always

[@mansirrabiu7412]

Haseeb the Great Electrician👍

[@aayesha6227]

thanks for sharing your valuable knowledge with us ..

[@hadibq]

Thanks bro! great channel and valuable sharing!!

[@AbdulMomenZargar60]

Subha bakher Janab Bhai Saab

[@fouziayaseenvlog]

Nice sharing

[@arunkumar-bh2dp]

you are always good explain of smps cirucuit

[@carolinediyandvlog]

102 thanks for sharing this good video 😊👍

[@manhardanmahedu3765]

Among all 37 comments,all are replying well,but nobody cross questioned however you have covered all possible factors for fluctuations but one more point for the same is dry solder of ground terminal of auxiliary winding or feedback windings

[@michaelmcsky]

Yes always inspect pcb and check traces and solder points with microscope.

[@ARA-HOUSE]

Lk 57 brother 👍👍👍👍

[@rolandberendonck3900]

Haseeb I have no optocoupler in my old robotarm SMPS, whichever I can replace by a diode for testing, but a very little yellow feedback transformer which separates the hot and cold side galvanicly. Is there a way to still apply your trick with the diode? or some other solution for testing both sides and disabling the feedback?

[@electroniquepassion]

Très bien merci

[@IndianVloggerAnjna]

Very nice 🙏

[@AbdulMomenZargar60]

Good Work Liked It # 169

[@pankajbhagat5641]

बहुत बढ़िया मित्र Smps मेरा विषय तो नही है लेकिन आपके बताने का तरीका ऐसा है कि खुद को रोक नही सकता। मेरे साथ कभी कभी एक समस्या आती रहती है एक 6 pin का smd ic है इसका नम्बर qbqo या फिर qbqp या और भी कोड नम्बर से आते हैं।इसका output pin 6 नम्बर है vcc 5 नम्बर ground 1 नम्बर है। स्कूटी के चार्जर में कभी कभी ये ic दिख जाता है और प्रायः जला हुआ। अब प्रश्न ये है कि ये मिलेगा कैसे और किस नम्बर से। कृपया मदद करें।

[@HaseebElectronics]

आपका स्वागत है और आपकी बहुमूल्य टिप्पणी के लिए विशेष धन्यवाद QBPO 6 पिन मॉसफेट पैक है। इसके अंदर 2 MOSFET हैं। इसका पार्ट नंबर Si1905DL है।

[@arashzergan3741]

Hello, engineer, should I buy a 179 series fluk multimeter or his 87 model, if possible, which model should I buy? Which model do you approve of?

[@louisdesipio3343]

What voltage should zener be at VCC capacitor for the 3842 ?

[@tameromarw]

جزاك الله خيرا مجهود كبير وشرح وافي يا هندسة

[@HaseebElectronics]

شکرالک یا اخی اللہ یسعدک و یسلمک رمضان مبارک علیکم و علینا

[@saicharan8696]

Super explanation sir very nice, thank you very very much, kindly do videos on sound bars various problem

[@HaseebElectronics]

best regards and special thanks sure i will try to arrange on sound bars issues

[@الفردوس-ن6غ]

Waaleykumussalaam warahmatullaahi wabarakaatuh maasha’allaah soo nice 👍🏼

[@kishorebaishya9492]

Sir, My 12 volt 1ampere SMPS adapter voltages shows ok , not fluctuations but ampere fluctuates from low to 1.26 amp when I measure by multimeter ,please reply.

[@hillaryaura7244]

Hallo Shifu Haseeb,your student here,,@timestamp 10:41,,talking about overload protection,,,convince me the volt threshold of the uc384..can reach 16 volts to trigger the shutdown state ,,yet we have a 12v zener diode D2 in parallel with the aux vcc path

[@vkskasana]

I have a laptop adapter. The feedback os fixed at 1 volt. However, the voltage at the Vcc capacitor is changing rapidly. Similarly, the output voltage is also changing rapidly. Could you please tell what could be the possible reasons.

[@drpainlesss]

My 24v smps psu only allows me to add 0.2v to load with blue voltage potentiometer is it broken? If I will set it like to 25volts psu restarting

[@rogerschelling5668]

Very helpful.

[@edithalvarezalvarezcarrale1464]

saludos si por favor me diga como se mide la frecuencia en chopper con el mult.digital.gracias..

[@VISHNU-eb6kx]

Sir... I have a smps (from old dvd). It's output is ok, and small tic tic sound present. When load is output is fluctuated and sound is increased.(12v 5amp smps). What is the solution sir.?? PLSSS REPLY...

[@nicholusedwards4328]

Very helpful information thank you?? How to test if the optocupler

[@laishangbambenitsonsingh2205]

I accidentally short circuit the direct secondary terminal of smps transformer and the smps stop working, (checked no fuse blown).. PLEASE LET ME KNOW HOW TO FIX IT....

[@peterfrancis3865]

Nice 👍

[@HaseebElectronics]

best regards and special thanks

[@Testequip]

I watched one of your videos regarding a pulsating SMPS and you then inserted a diode in place of the phototransistor of the opto isolator. I cannot find that video. Can you perhaps assist with the video number. Thanking you in advance Andre South Africa

[@ShumailaKiDuniya]

stay blessed stay connected

[@slotmachines756]

Can u try a free to air decoder without out put voltage..kindly explain

[@amals02]

Sir (top248yn) ic 24v SMPS output flickering. Any solution an how to check this

[@HaseebElectronics]

in top248 output fluctuates if output rectifier, output capacitor, feedback circuit, problem or at primary side main dc smoothing capacitor is open internally

[@amals02]

@@HaseebElectronics sir how to check optocoupler

[@amals02]

@@HaseebElectronics thanks sir

[@petrosmanolakis296]

Hello teacher . I would like to ask . How do we recognise the vcc capacitor on the circuit. Is there always a vcc capacitor on a circuit? Thank you in advance.

[@HaseebElectronics]

yes dear it is a great question this small electrolyte capacitor (0.1uf to 47uf and 50V normally) it is connected to the vcc pin of the smps controller please check video number 528 for more details

[@msbbadsha1456]

Very good video

[@nayanjagirdar8408]

👌👌👌👍

[@jatingada79]

out put may 12v ke bina 15 v ya 18 v ata hai kya problem hoga

[@HaseebElectronics]

please check its feedback circuit. check TL431 and its sense line (voltage divider network) check optocoupler are check vcc circuit of the PWM IC. might be it have some issue

[@arashzergan3741]

Thank you♥️🌟

[@ddjazz]

What if the output is fluctuating and when I start measuring the smps works normally again?

[@giorgostexnikos6976]

excellent

[@HaseebElectronics]

Many many thanks

[@-koora2day744]

Hello mester hassib can i get the book or that papers that you explain in it.

[@larrycorpuz3172]

Hello brother just want to ask favor if you can share me some of your SMPS diagram and amplifier diagram. I got a smps problem upon power up +/- supply is okay but it decreasses gradually to zero.

[@PatrickRibbsaeter]

very nice, thanks master

[@HaseebElectronics]

You are welcome

[@boybravo689]

Sir better to look the data sheet of the pwm ic in order to know the required frequencies and duty cycle of the pwm ic sir im i correct sir if i measure the frequency and if its abnormal the smps is not working properly tnx sir

[@HaseebElectronics]

you are right we must check datasheet for proper work. as i always insist in videos to follow datasheet or sample circuit in some smps IC (specially adjustable switching frequency type ICs as UC384X series or TL494 or SG3525 type ICSs) we need to consult the RT / CT components to know the exact frequency as these are programmed by the designer for perfect alternate

[@danielmulenga3019]

What could be the fault of the welding machine where everything is tested and are ok but it can not weld ? And can only release small Sparks like that of the earthing !

[@SureshKumar-nk2ok]

Hello sir wallekum salaam. My question is not related to Smps, I got filament lamp with no data how can I confirm the voltage of it , can I connect it with series lamp and vary the auto transformer .thanks

[@HaseebElectronics]

if it is dc lamp then try to use variable dc power supply to get its nearly full brightness if it is AC lamp then you can use variable transformer for AC voltage. or try to use different series lamps like 15 watt, then 40 watt, then 60 watt then 100watt then 200 watt to determine its power rating

[@jacksetiyono6179]

From indonesia here now :)

[@HaseebElectronics]

most welcome dear

[@pvkprasad3256]

Hi. Vcc voltage should be 16 but it is varying between 12 to 13 and smps not power on what will be the reasons

[@uanwar111]

salam sir sine wave filter per video bana legiye

[@ministeriomundialliberando8403]

I have never understood why the bulck capacitor libe can not provide constant current to uc38xx since this line supply power to the rest of the circuit, including aux winding.

[@icsenergia4265]

Can you make a video on PIC microcontroller

[@shakilahmed591]

شكرآ جذاك الله

[@hamidheidary8754]

سلام خیلی عالی بود ایکاش می تونستید این مطالب وبه زبان فارسی هم بگذارید خلی عالی باتشکر

[@maharvoice3944]

Good

[@opfahad43]

Thank

[@HaseebElectronics]

you are welcome brother

[@tvbox8478]

Aleyküm selam 👍 ✋

[@HaseebElectronics]

wa alaikum salaam dear

[@hematkarangiya9692]

Respected sir please ek video badi led 100w 150w driver smps ki banaye

[@hasn812]

وعليكم السلام ورحمه الله وبركاته

[@zakerzaker3762]

Asalam alaikum bhai Samsun refrigerator kit not working

[@RahulSahu-pd3ut]

Sir hindi language me bhi video upload kare

[@Junq-b8v]

Yes

[@navneetsingh2600]

Sir hindi ma b bna dijya kryie

[@soumyaparija494]

Cercuit is not vsible

[@HaseebElectronics]

Oh i am really sorry for that. in future i will take special care for it please accept my best regards and special thanks for valuable point

[@سعيدحواصلي]

Without loading you can't judge God or bade

[@HaseebElectronics]

السلام عليكم ورحمة الله و بركاته you are right, if we want to test test regulation test ( either line regulation or load regulation) but if the vcc is adjusted wrongly,or vcc components get devalue or vcc winding gets dry joint, then the power supply will fluctuate without load if there is some high leakage in secondary section, it will cause to drive the smps in overload condition then the smps will fluctuate without load الله يسلمك و يسعدك يا اخي الكريم

[@noshokhan6849]

abe angrezi balak

[@HaseebElectronics]

kzbin.info/www/bejne/eWqVlHyBordqjas

[@HaseebElectronics]

youtube.com/@haseebelectronicsurdu

[@HaseebElectronics]

janaab aap mere Urdu channel Haseeb Electronics Urdu ko dekha karein

[@rohanranjandesilva465]

very good explanation sir i have issue in 12v charger vcc cap voltage 13.50v but out put 0v i send your wats app massage

[@HaseebElectronics]

please check mosfet check pwm controller drive , if drive signal missing the check its control signal (feedback vcc etc) verify output section