Li-Ion Charger + How does a Switching Power Supply work

I'm opening an 18650 Li-Ion cell charger and reverse engineering its schematic. Then I'm explaining how does a switching power supply work. This time it's a simple 2-transistor switch mode power supply (SMPS) without an optocoupler.
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[@engineerkohat]

Excellent explanation of the parts and circuit. You have really a good understanding.

[@T2D.SteveArcs]

Two transistor luxury modeeeellll I love this guy

[@lightbulbgonewild3205]

Hi Steve!

[@T2D.SteveArcs]

@@lightbulbgonewild3205 hi mate👍😁

[@hoytdotblohm]

The forbids to invert I'm sure is because of the contacts. Thank you for your content, I really appreciate your knowledge, sense of humor, and cat.

[@omsingharjit]

5:26 it seem wrong ...... as in drawing the primary winding are wound in same direction as the dot on both winding is in downside ... so according to the back emf voltage in which current direction in the secondary ( aux and secondary ) winding are opposite to the primary ( main ) winding , so ........... if current goes from non dot to dot direction in the primary winding , then current should go from dot to non dot direction in the auxiliary winding mean current should go from base via ossi cap to cathode side of the aux winding as ELECTROLYTE CAP INDICATES ITS POLARITY ? CURRECT ME ? IF I AM WRONG ? IN DETAIL

[@Bwup]

This was amazing in every aspect

[@blg53]

Great video. Just bear in mind, when you are talking about the transistor being OPEN or CLOSED the bilingual people would understand you perfectly, but the native English speakers would interpret that in exact opposite to what you mean. Instead of using open and closed terminology its better to use SWITCHED ON and SWITCHED OFF one. This way it is clear to the native English and does not sound weird to the bilinguals. Keep up the good work.

[@DiodeGoneWild]

You are right. It's quite confusing. An open circuit equals to a closed valve or door.

[@clementeffiong6881]

You are very correct!

[@movax20h]

I was going to complain that using OPEN and CLOSED is fine, but then I watched the video around 5:10. Yeah, he is using OPEN for SWITCHED ON / CONDUCTING, that is not good way of using word OPEN. Open for me means non conductive, just like open switch. Good hint!

[@brahimabdelsadek9534]

You're talented.thanks for teaching us.i love your channel.wish you a good luck👍👍👍

[@liamgomes6502]

Appreciate the efforts put in your videos!!

[@doriantech9064]

We need to invent LON to produce that BATTEY. Good video.

[@doriantech9064]

We're too lazy to invent LON.

[@mohanramakrishnan3287]

The word "dodgy" is my favourite word too!

[@sahebdarkhor]

Hi, good job.I assemble this circuit, thanks. but 13001 transistor be hot.what reason my be?

[@acadenas]

You can activate the video subtitles on your channel? Thank you so much

[@perimano1]

At 6:09 what way is this capacitor charging through this diode ?

[@saarike]

Great explanation and excellent video as always! Thanks DiodeGoneWild for hard examination and explanation. :)

[@sadunnakipoglu9471]

تحياتي لك وأشكرك وأقدر مجهودك ، تحياتي لك من تركيا .

[@fosahngoe3503]

Great work man keep up i love your explanations

[@iblesbosuok]

You have lovely handwrite. Cheers from Indonesia

[@prakashsharma6186]

Till date I could not understand how the feedback circuit of main transistor works. Can u explain in detail.

[@TheRmoroni]

I really like your videos, they are entertaining and informative.Thank You!

[@harveshsinghthakur6667]

Mind blowing explanation man .....grate work

[@OctavMandru]

That box is used in many chargers. Back in the day I ordered one from Gearbest. It exploded in my hands However, the safety text applies. If for instance one would carelessly two batteries, one in reverse polarity, it would go south very fast. It is bad design imho

[@MrBrymstond]

This charger has feedback when inserting a battery, I believe it needs a Schottky Diode with the band facing the battery.

[@evrim73]

@DiodeGoneWild I have a question about those 4.7nF, 300Ohm and 4.7uF. How does one match those values to the input 50-60Hz? Say, input is 30Hz halved, how should those values change? I hope you can explain the timings. Thnx.

[@faidularcs]

Very nice explained 👌👏👏👏👏👏

[@arivnidunami3047]

Hi, i am a beginner in smps. Please make a video to make an own designed smps. Add how to calculate them. Thanks

[@0120-b2l]

Thanks for the explanation

[@stefanof.896]

Li-Lon?? New chemistry? :)

[@ELECTROHAXZ]

Maybe :o

[@DiodeGoneWild]

Maybe :) but it seems that the chinese guys are confused by the fact that lower case "L" looks like upper case "i" and they sometimes use L indstard of i or they use i instead of L.

[@MrOpenGL]

It's all the fault of Microsoft and the Arial font ;-)

[@doriantech9064]

There is no such material like "Lon".

[@cri8tor]

Really appreciate your videos. Cheers

[@SianaGearz]

I wonder, i've seen these sub-$50 meggers, VC60B/B+, different branding on silkscreen, Vici, Victor, etc. I know you can't really use them to say whether a transformer is good, because as it sings along, bad things can happen, lacquer can break, mediocre insulation can shift, but are they good enough to tell you whether the transformer is still reasonably isolated right now and not going to shock you right tonight?

[@kishanpreston1533]

hi sir my mobile charger adapter 5Volt 2.1apms , after 4 months charging very slow it's take around 1%to100% 3hours for complete n also changed USB cable i think amps reduced hav u any idea to fix

[@gabrielphilips6980]

Why is isolation between sides important?

[@DiodeGoneWild]

Why is human life important?

[@gabrielphilips6980]

@@DiodeGoneWild What happens if the two sides before and after transformer are close?

[@doomdylan]

You still can't invert polarity between the two batteries :)

[@kruemmelbande5078]

Well I prefer parralel charging instead of series, yes if the batteyes are different levels, there will be a current, but in series, one battery will be overcharged or possibly killed.

[@probhakarsarkar2430]

3:40 hot chip lol!!

[@fadigorgos9510]

Thanks But,i have a q!! How the main transistor turn off with the cabacitor , I mean,how the cabacitor passing current!!?? Sorry, for my bad english

[@dientuhandmade9412]

That's great, I like it, I'll try to make one

[@KACPER050599]

That cracked solder joint at 3:53

[@techkushan470]

What is the output voltage

[@bermagmohammed8826]

help! I own the same. the led lights up green when I insert the batteries without plugging the charger

[@itsme5215]

its a shock proof ??? pls reply

[@lostkingclark]

這充電挨西最好用不管電極正反都可充（閃靈充也有這挨西）網路搜尋挨西代號就可以得到pdf檔案（資料規格表）

[@milovanmitrovic-miks6174]

Best video thenks...

[@davidloter1670]

What is druchee ?

[@sirkllr]

i really like this stuff

[@crocellian2972]

Great job.

[@meassavuth4649]

Thanks

[@TumpaTalapatra]

3:39 hot chip lol

[@nsfeliz7825]

look up a company called potato chips tat makes I.c.s

[@xerejuneseve6333]

The shorrt thru two tranzistors kill these charger.

[@MrWasim100100]

nice video

[@zx8401ztv]

Battey supply he he :-D, we like ching-lish :-D. That circuit looks similar to the other 18650 charger you showed, but a little better. Shame there is no opto feedback and emi capacitor, ahh well its cheap. Same auto reverse polarity i.c. The two transistor circuit is a bit minimal, but the 12v/5v hard drive caddy supplys are not much better, and they last a decent time.

[@SianaGearz]

Why would it need opto feedback? A little bit of voltage sag with current might even help the HotChip run less hot! Keeping in mind HotChip is a specialised linear regulator.

[@DiodeGoneWild]

The 2-transistor power supply topology is actually not bad at all. A lot of TV's and CRT monitors used this. It works really well. It only needs a to add bridge rectifier, fuse, inrush resistor or NTC, EMI filter, snubber and so. No other transistor or chip is necessary.

[@drobotk]

It forbids inverting the polarity because when using two batteries at once you have to plug them both in the same polarity or otherwise one will go boooom

[@edgarkoterle]

To upozornenie proti prepólovaniu je tam asi kvôli tomu, aby obidva články boli pripojené v tej istej polarite...

[@DiodeGoneWild]

To je dobrý vysvětlení. Sice to má automatickou polaritu, ale právě protože jsou obě baterie paralelně, nesměj se tam dát náhodně. Akorát je divný, že ta výchozí polarita je opačně. Ono jí to sice detekuje a otočí, ale kdyby se tam dal článek vybitej skoro na nulu, tak ho to bude nabíjet opačně.

[@didingelectronics4846]

one tiyo tiye hehehhe

[@fapcrafter7395]

it says "FORBID to invert" so it may have wandet to say "it's ok if you turn around the battery"

[@SianaGearz]

I hope you're not testing a stun baton on yourself? Maybe you need a frog leg from a gourmet importer or something.

[@kumaliah]

please make a mini inverter in your videos

[@fritzhvienc.ortega9415]

thank you sir.

[@jimis04]

no core disassembly and turns count? That tells me you liked it and didnt want to destroy it:). By the way this auxiliary feedback winding which is proportional to the secondary is the evolution the chinese made to the switching flybacks...In order not to use an optocoupler and secondary tl431 or zener and reduce cost...By a simulation i had made on LTspice i say that it also lowers primary voltage spikes and ringing on T(off) (voltage spike 450V on self oscillation Vs 550V of regular optocoupled flybacks) of the flyback so reduces the need for a BA159 or other diode snubber or supressor circuit on primary but didnt made a real experiment on oscilloscope though to prove this. :D:D:D:D

[@DiodeGoneWild]

You're Sherlock Holmes :). But even some branded chargers have no optocoupler. I plan to open the transformer anyway :). I can buy another charger.

[@alessandrozax]

Someone have the english datasheet version for ht3582 IC !? .. Regards..

[@ItaloLima]

Cool !!

[@tangflx]

BWAHAHHAAHHA LI-LON. DUDE YOU MAKING IT SO FUNNY WITH YOUR ACCENT. TAKE MY MONEY!

[@ssikarim]

Thanks.

[@saarike]

Nice!

[@edinfific2576]

Too bad you didn't check its efficiency, I would really like to know it.

[@katarzynan.8500]

3:29 "Certified"

[@djbijoy5530]

Nice

[@Daveyk021]

Close=Open and Open=Close??

[@omsingharjit]

luxury model .... lol

[@ابومحمدالميساني-ر2ج]

You are flag 🚩 👍👍👍👍👍

[@itstycho3184]

You can't keep your money ha xd

[@brunofonseca9686]

I thought you mispelled Battery then I saw the product. (facepalm)

[@doriantech9064]

It's a typo.

[@candleacademypakistan9974]

What is lithium Lon??? .....a new chemistry?????? It's ion bro not Lon

[@cenchloraadums3143]

@ 0:14 you can see this (mostly probably Chinese) manufacturer has invented not only a new chemistry, but also a new name for what you charge using this charger...Lol

[@candleacademypakistan9974]

@@cenchloraadums3143 thanks for explanation......stay blessed...I love your work.

[@vaibhavk008]

Are you indian your speaking accent same as indian

[@tangflx]

i BET HE'S INDIAN! I LOVE HIS ACCENT. HE SEEMS LIKE SINGING ALL TIME. LOLZ.

[@mrakjunior]

Are you kidding me indians dont sound like this, he is not an indian Iam sure he is likely to be from scandanevian.

[@tangflx]

Knight Rider Bwahahahahhaahha Scandinavian bwahahahahahhhahhah. You made my day dude. Lets bet with bitcoin man that hes an indian

[@honda9731]

vaibhav you'll got it wrong, he's Czech. Czech it out

[@DilRoshanElham]

i am an an indian...and m damp sure he is not an indian...

[@astromancer]

Hot chip :D

[@MesutAtmaca]

first ...

[@beeriyobarwaaqo372]

Hhhhh. I like your accent

[@weerobot]

Dodgeyyyyyyyyy............

[@jamesturner2126]

LiLon battey charger. Lol

[@DiodeGoneWild]

They often confuse i with L because lowercase L looks like uppercase i :).

[@DavidMG99]

😁😀 Chinese 🤦

[@maccheese3006]

beeep......beep haha

[@СергейТ-з4ж]

Li-LOL

[@yuspamudji]

your videos are good and educating, but cant you talk normally ? your tone sounds so strange

[@zarirvtech]

yusufpam ha ha, i also notice that...

[@SpeccyMan]

Define normal!

[@omsingharjit]

5:26 it seem wrong ...... as in drawing the primary winding are wound in same direction as the dot on both winding is in downside ... so according to the back emf voltage in which current direction in the secondary ( aux and secondary ) winding are opposite to the primary ( main ) winding , so ........... if current goes from non dot to dot direction in the primary winding , then current should go from dot to non dot direction in the auxiliary winding mean current should go from base via ossi cap to cathode side of the aux winding as ELECTROLYTE CAP INDICATES ITS POLARITY ? CURRECT ME ? IF I AM WRONG ? IN DETAIL

[@omsingharjit]

5:26 it seem wrong ...... as in drawing the primary winding are wound in same direction as the dot on both winding is in downside ... so according to the back emf voltage in which current direction in the secondary ( aux and secondary ) winding are opposite to the primary ( main ) winding , so ........... if current goes from non dot to dot direction in the primary winding , then current should go from dot to non dot direction in the auxiliary winding mean current should go from base via ossi cap to cathode side of the aux winding as ELECTROLYTE CAP INDICATES ITS POLARITY ? CURRECT ME ? IF I AM WRONG ? IN DETAIL

[@omsingharjit]

5:26 it seem wrong ...... as in drawing the primary winding are wound in same direction as the dot on both winding is in downside ... so according to the back emf voltage in which current direction in the secondary ( aux and secondary ) winding are opposite to the primary ( main ) winding , so ........... if current goes from non dot to dot direction in the primary winding , then current should go from dot to non dot direction in the auxiliary winding mean current should go from base via ossi cap to cathode side of the aux winding as ELECTROLYTE CAP INDICATES ITS POLARITY ? CURRECT ME ? IF I AM WRONG ? IN DETAIL