How does a mobile charger work? SMPS with Opto-Coupler. 

can I use your Circuit in my video? because I make video in Hindi language and I want to explain same things in Hindi language, I will waiting for your response!

@@DipElectronicsLAB Sure.

Hi, Please make a video on how to design 220VAC to 24VDC, 12VDC, 5VDC. Basically teardown of HILINK or Mornsun AC-DC converters.

thickness of the wire ?

Nice

😂🙏

me too😄

Me too 😂😂😂

120V AC go through the transformer in order to step down the voltage then it go to the 4 diodes which we call it bridge rectifier to convert AC to DC. The capacitor is added parallel to it because it will reduce the ripple voltage. not sure about why the using the transistors but i think it increases the frequency so they can reduce the size of capacitor and transformer.

Electricity takes a while to truly understand, I'm a journeyman electrician and electrical engineering student, I've been messing with electricity since I was 6 taking apart my walkie-talkies, and there's still a lot left for me to learn. If you care to learn, you will eventually get to a point where this lesson will seem so easy it's like watching a video on how to tie your shoes. Just stick with it.

Thank you for mentioning it...😀

Thanks a lot for that inpur

When we use it in 100v eg in train, the charging time is very long may be due to less output volt and current

@@klmkt4339 it depends on the charger bruh

And efficiency and standby consumption.

It used to be just a transformer and voltage regulator circuitry but that is extremely huge, heavy and inefficient so this is the modern design

Watch some Diode Gone Wild videos, brain.exe will become permanently corrupted😂

@@anindyamitra5091 😂

Lol😂

@@anindyamitra5091 lol man😂😂😂😂😂 so funny😂😂😂😂😂😂😂😂

Hmm..we have the same OS. Mine crashed too, after the oscillator story. Any upgrade download link ? :D

The ratings wold be low

Because they want you to be dumb

​@@gabrielphilips6980audience wants dumb things like Cerebrity news, global warming and Covid19 brainwash news

True is should be basic knowledge

Glad you liked it.😀

@@ExplorerStuff Hello, Can we use a 12v DC input in stead of 220v AC? If not, what we should to change in the circuit to be 12v DC input? Thx

@@hass_ra80 Simply use a Linear Regulator to convert 12VDC to 5VDC. If you want higher efficiency then you can use a Buck Convertor but the ripple on output will be high and might damage batteries without proper protection. You will have to run the numbers or simulate, prototype it for best results for your application

@@hass_ra80 If you have a bridge rectifier to make all your outlets 12v DC, then you won't be able to step it down with a transformer, every power supply would have to use a DC-DC converter which is possible but probably less efficient, and the AC standard is already established everywhere

My exact thoughts, I would've guessed that most of modern phones uses a Buck converter /cuk regulator or another synchronous SMPS circuit instead

@@DRAIK08080808 yah for efficiency. Cause this more like a linear circuit that would decipate power in form of heat.

90s chargers were better than this. This curcuit is copied (with some mistakes, like component values and seconsary diode orientation) from the cheapest chargers you can buy. They are very unsafe and don't last long, but are great to demonstrate the basic principle which is the same for all flyback transformer PSUs, no matter if old, new, cheap or expensive.

@@DRAIK08080808 The output needs to be isolated from mains. Can't use a buck converter.

thing simplesimple

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Glad you think so.😄

Sorry for being dumber than a beginner, even though I tested at 132 IQ. I just wish I could find the video where they start at the beginning.

Bagaimana cara menambah ampere pada charger?? Tq

​@@imammaarifarif4388 Change the transistors. The T1 is gating how many amps are let through, if you change it for one with more rated amps, it should let more go through. I guess you'd have to then change the transformer and capacitors as well, probably even the Schottky diode.

I also....

KARABAĞ AZERBAYCANDIR GARDAAAAŞ

@@bagatur9289 evet öyledir abla

Me too. Always loved electronics but rarely found good material about the matter.

Agreed. As a visual learner I have always struggled to understand signal paths through circuits. Whenever an inductor or capacitor is introduced it starts to get very confusing for me because there's so much going on. Visuals like this one are the key to my understanding of these concepts. Thank you so much to the creator of this video!

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Good on you for explanation!!!!!!!!

Best of luck

😂 because it's cool.😂

Not robot. It's ai voice😂

Yap, thats how they used to work, this new design is simply for space and efficiency

#ShyamNivasShahu

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میرے چینل پر ائیے۔ اس سے بھی بہتر ویڈیوز ملیں گی۔

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9663+

Still most of the concepts introduced in this video remain valid

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This man deserves TWO RU-vid Channels! Great Great Video! Please keep doing more

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As far as I can tell, the typical engineering professor uses their knowledge like a weapon to basically rub their students' faces in the dirt. So many people go through engineering programs and either don't make it, or barely make it, but gain no intuition for the concepts. Why does it continue to get taught like that?!

Thank you.😄

With AC, it's probably a good idea to "know" before "doing" lol

Now that you mentioned it. Maybe the third band was gold and not yellow. So it will be 2.6 ohms. The video cannot be changed but I will mention it in the description. Thank you for noticing.

@@ExplorerStuff yes.... fusable resistor are protect our power supply for short circuit protection and high voltage spike.i have a electronics related youtube channel plz visit ...thanks

@@ExplorerStuff sometimes it happens to me with 4-5 or 6 band resistors. But I agree, that sound more reasonable, as P=I^2*R. In a 10W charger, (10/220)A flow through the resistor. So the resistor's power would be P=(10/220)^2*260000 = 537W :) Thansk for the video! It's the best one about SMPS I've seen so far

I'm looking for this comment.

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This is very basic switching power supply, the principle is the same but you might find thay some are much complex depending on the design and output power requirements. I am electronkcs technician and i somehow do repair advanced switching power sjpply down to component level. Goodluck mate.

Thanks@@sthandiwe7825 for the information and encouragement.

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With an artificial voice...

I am also your subscriber

Aap bhi to great hai sir

Abhi bahut acche ho

I am your real subscriber

Can u find the mistake in this video

hiiii

Now that you mentioned it. Maybe the third band was gold and not yellow. So it will be 2.6 ohms. The video cannot be changed but I will mention it in the description. Thank you for noticing.

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You can use a step-down transformer to lower the voltage to 15-20V, then pass it through a bridge rectifier and filter capacitor (1000µF/35V). Also, you can use a voltage regulator(LM7812 -> 12V/1A Out) with a capacitor (1000µF/16V) after the rectification. This would give 12V DC for Vcc of SG3524.

@@ExplorerStuff thanx for the fast response👍🏼

If you're talking about a SMPS with a controller that needs powering then some controller ICs are designed with an undervoltage lock-out and a very low standby current. The controller is started from the mains via a dropper resistor. The current charges the aux supply capacitor. When the voltage on the capacitor exceeds the starting voltage the controller comes out of standby.

@@oliverbroad4433 thanks!

If it makes u feel any better people 200 years ago thought up and harnessed these concepts and are named after there findings ..ohm's..Faraday..volts.all these things are people names ..and we teach it all common place in school and were dumber now than then WHAT HAPPENED..nobody invented any of it just harnessed it

CRT televisions were among the first devices utilizing this concept, to generate the high voltage for the anode of the picture tube. Of course with step up instead of step down transformers. 1930s probably... Some power transformers are large because they are running on the low mains frequency itself... Which has some advantages like less electric (going to the load and back into mains) as well as magnetic (radiating from the transformer and wiring) high frequency noise, and better reliability. Or they are used because the load requires low voltage, low frequency AC instead of DC.

I'll just hijack this comment to say that it is not 102nF or 1000nF. Hopefully no one has used the circuit posted. That would be quite dangerous to do so. The capacitor in between the primary and secondary should be limited in value since it can be a low impedance path from the AC line if it is too large. Touching the output side will essentially be connecting yourself with the AC line with only this capacitance in between. A 100nF capacitance with a 230V 60Hz line has 26.5kOhm of impedance and will allow up to 9mA of current (painful shock). Increase that capacitance to 1000nF and you have a maximum of 90mA (can be lethal). It also has to be a special capacitor that is safety rated because it can fail shorted if it is not, which will make the output directly connected to the line. Again, touching this output will electrocute you. Please don't play with high voltage circuits. You can kill yourself.

@@ronnueda933 Correct, the cap is 1nF or 1000pF, "102" means 10pF + 2 zeros. That's a common value for such interference caps. Another mistake is of course the inrush resistor value is way to high, should be 4R7 or so. Also, the secondary diode is polarized wrongly. The diode is sopposed to be *reverse* biased while the primary is energized, so a magnetic field can accumulate in the core, which, when the primary is turned off, collapses into the secondary with the diode conducting and charging the cap powering the load. This is an important detail as it sets apart the flyback transformers (with air gap in the core to hinder saturation during accumulation!) used in low power devices like USB 5V supplies like here, from other kinds of switch mode transformer set-ups.

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The 260k resistor limits effective current flow to

It was a mistake. Its 2.6 ohm not 26 K ohm. It was a golden band and I thought its yellow.

@@ExplorerStuff yes sure. I realized the same.

Actually its 2.6 ohm. There was a gold band and I thought its yellow band. Cannot change the video, but I did mention it in description.

Yep, it's 2.6 ohms acts as a fuse.. but still the explanation is 100% satisfaction🥰👍👍

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English isn't your first language