{525} Role of Auxiliary Winding / VCC or Bias Winding In SMPS Switch Mode Power Supply

in this video i explained the Role of Auxiliary Winding / VCC or Bias Winding In SMPS Switch Mode Power Supply. what is aux winding and how auxiliary winding works
in most of the topologies, the pwm IC require a low power supply of about 10- to 45-V output. It is used to feed the usual pulse-width-modulating (PWM) chip for the main “power train / dc rail,” and power the logic and sensing circuits that perform various housekeeping
functions. Such housekeeping functions may include over-current sensing, over-voltage sensing and protection, remote signaling, and correction of turn “on” and turn “off” sequencing for each output in a multi-output supply.
in initial startup, when there is no power output, in that stage a startup current is provided through a startup resistor, which charges the vcc capacitor connected to the vcc pin of smps pwm controller ic, at a specific voltage threshold that ic will start switching and smps transformer will start to induce voltage in secondary. thus there is a secondary winding (named aux winding / vcc winding / bias winding) which's one end is connected to primary ground and its second end is connected to a rectifier, which will rectify that voltage will fed to the vcc pin

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It's a wonderful explanation on the biasing circuit of A SMPS with very keen pointing of the operation of driver , thanks Sir for Your great explanations

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[@1fertube]

Very good explained. The rectifying diode of the auxiliary circuit should be schottky type?Thanks

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best regards
yes output rectifier must be schottky, Fast rectifier, MBR type
with low forward drop voltage

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I say the least as "Thank you so much".

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[@abednier]

salam,
Mr.haseeb I watched several videos about the SMPS i found them beneficial.
I want to ask about two recurrent matters in SMPS.
1. when the power supply starts with a buzzing sound (i think from coils) and after 5 to 10 seconds it turns off suddenly.
2.if all the multi voltage power supply is working normally but one voltage is missing (6v), when I applied 6v to the output dc capacitor ,it drew high current and I got a voltage drop.
It would be great if you could benefit me , especially if you encountered such problem.
Regards

[@7276556536]

Easy way to control output current. Pl explain nearly about 6v /1.5 amp current

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Well explained sir
.

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Salam M Haseeb, very nice video ! Especially that clear - and still unknown from me - OVP on the IC side, as a protection. Thanks & Salam Aleikum.

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best regards and special thanks
sure we will see it practically in upcoming session

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Great brother very wel explained wel done thank you JazakAllah... Ye Mera bhi sawal tha jiski mujhe samajh nahi arhi thi jo ap behtareen tareeqay se samjha diya.. Bht shukriya Alla ap ko khush rakhay aur apko iska ajar de.. Aameen

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aap mera urdu channel (haseeb electronics urdu) dekh saktey hein
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Good explanation

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Terima kasih telah berbagi skema dan cara memperbaikinya brother
adakah link terbaik untuk saya bisa menemukan tiap skema seperti ini?

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i will try my best to arrange indoor unit board
(as currently it is not available with me)

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i have really learned a lot thank you

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[@souhailhajri]

My Vcc at the the pin 13 of the IC ML4800 is 5V while it should be 14V.
Also the voltage between FET D-S is only 308V instead of 420V.
Voltage over the power caps are also less than it should be 312V instead of 386V.
I ve replaced the IC, the power caps, the switching mosfet. Still the same problem.
Can you please help?

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Another great information 👍

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جزاك الله خير

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Very nice bhai

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welcome dear

[@fuzzs8970]

Hi. Is there something else that can be used instead of an incandescent lamp in the series circuit to test power supply? I can't find bulbs except led ones in my country. Thanks

[@surekhabelhekar]

Sir your video support me for repearing thanks for such simple language teaching sir please make video faulty electrolyte capacitor in SMPS what is the effect on SMPS cct

[@boybravo689]

Sir is that auxiliary winding is in the secondary side of the transformers? Sometimes that auxillary winding is in the primary side of the transformer it is correct sir? tnx

[@HaseebElectronics]

in any transformer there is only one winding used as primary
other all winding are secondary winding
it depends on the user how he uses any circuit
if it is used in primary side or secondary side it will remain the same
if auxiliary winding is used with primary side or secondary side, it will remain output winding

[@opposites-369]

Assalamu'alaikum Sir.. what's different between power Schottky rectifier STPS20120CT with MOS Barrier Schottky rectifier V30120C? I hope you will answer, thx before, May Allah make it easy for you and always healthy 🤲🏻🙏🏻👍🏻

[@HaseebElectronics]

STPS20S120 is from ST microelectronics for 20 amp 120V with 0.7 volt fprward voltage drop
V30120C is from vishay semiconductor having 30 Amp 120V with 0.68V forward voltage
so V30120 is better than STPS20S120

[@karatzdi]

Hi. Very pleasant and descriptive. I have a question. Could we have the same IC start without soft start ? Directly from a winding via a rectifier directly to pin 7 ? Did it ever happened to you ? Thank you

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MashAllah bhai

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thanks a lot

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Stay blessed and connected with me

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thanks a lot
best regards

[@MevludeDunyas]

çok güzel bir paylaşım olmuşşşşş

[@directsystems2225]

Sir, VCC capacitor is fluctuating. I have changed the 50v 47uF capacitor. Still fluctuating .. where to check please..

[@HaseebElectronics]

Please chech secondary side short circuit components
Something is interrupting the feedback

[@user-gn2ws5qt6n]

New subscriber here. Sir I have an SMPS here with no output that I have been trying to repair for a week now. I replaced the components that i found faulty. I can now read DC voltages (around 290 to 300 VDC) at the input of the transformer but unfortunately it appears that the xformer does not magnetize. it shows zero volt at the secondary side and as well as at the aux winding. Kindly tell me of the possible points that i missed to check. thanks in advance