Questionable 2-in-1 USB charger - test, schematic & modifications
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- Опубликовано: 1 окт 2024
- I thoroughly test and examine a cheap two in one 5V USB charger with a 100-240Vac mains input and a 12-24Vdc car input. I take a look inside, reverse engineer its schematic and explain how does it work. Then I try to do a lot of modifications to the circuit. Surprisingly, this doesn't go horribly wrong, just horribly long :).
Even more improvements of the buck regulator:
• Building a better buck...
You can support me on Patreon:
/ diodegonewild
everything is fusable if you pass enough current trough it.
Good informative knowledge shearing Thanks
Everything may also sustain an arc if you pass enough current trough it.
Talonfluff - unless it goes short circuit!🤣
DiodeGoneWild hiiiiiiiiii I like u
@@Mark1024MAK there is no short-circuit with absolute 0ohm resistance .. with enough current any short-circuit can be made open circuit 🙌
No one on the youtube describes the schematics with such beautiful details. Good.
I give it "Tjuu..."
his videos is a CATantastic😼
I hope someday I’ll have the same level of understanding of electronics as your cat 🐱 has.
And oh yeah, to reassure your cat: I survived watching the video right to the end.
Try to power that charger with 240v and 12v at the same time in order to get 1Amp :-)
The most questionable thing about this charger is the shape. If it wasn't because of the title, I would've thought this is some kind of mains powered vibrator thingy.
Mains powered vibrator from China sounds like a disaster, sure would add a bit more tingle due to poor isolation LMAO
It's a portable rechargeable mini dildo
What fills the heart, will flow over from the mouth (or keyboard).
It should be used on the designer of this product.
12:47 so the mains comes in... and goes straight into the cat!
i love the cat, that's the best part of videos
Tx again for a nice video. I appreciate all the effort you take to reverse engineer this charger, draw a complete schematic for us and explain how it works!
Strange device. Why would you want to combine a car and a mains charger anyway?
Surely you can work out why a dual-powered charger would be handy?
For example, when travelling.
John Coops
When traveling I’d take a small mains charger and use a small 12V charger. This thing is larger than the 2 combined. I don’t see an advantage in combining the 2 functions.
@@Conservator. - I take a 4 port Orico charger that runs off 12V as well as mains. Much easier!
"Where's the EMI filter?" dying xDDDDDDD
DDDDDDDDDDDD.
Your channel had quality content about power supply
You can even make your own design and repairing, we want more Repairing and diy power supply
We appreciate your hard work
Thank a lot 👍👍👍👍👍👍👍👍
He already has many very interesting DIY staff on his page danyk.cz/index_en.html
I personally like the non-diy-content a lot, like this video. It's always interesting to geht those devices explained so detailed.
@@DrHouse-zs9eb just diy power supply because he had a lot of knowledge and can easily design a much powerful and simple design compare to Chinese one.
Please tell me what group you are speaking for, you twice used "we", does that include me?
I can't recall to have been contacted by you to ask for my opinion.
Next time please leave me out of this, I can speak for myself and so should you.
@@ZZtop-gg3lu - itno akharo
Good video. Very cool oscilloscope. Сделано в СССР
strong soviet technology xD
The input has (primitive), interference suppression - the combination of the questionable 2.2uF, the dodgy 1 Ohm resistor and the forward resistance of the single input diode. These will probably start to roll at about 200KHz! Could be tested? Yet another great video, many thanks.
POLSKA TO OGLĄDA :) Hi i'm from Poland and love Czech
I'm from Poland too! Great videos! Keep 'em coming!
The cat is like, "why is he yelling at this piece of paper with weird symbols on it instead of feeding me?"
I'm so happy you do all these tests with these weird products !
We get a lot of useful info !
And you're very funny :)
Charrrgerrrr!!!
Thanks for all those experiments and modifications to let us understand the effects of the components can improve the overall performance!! Still waiting for the big ATX power supply test, schematic and also the 24v power supply modify into a bench power supply. Thanks alot @DiodeGoneWild!!!
To cat: Never sleep a second!!
I love your cat !
Awesome Video! You had me glued to the Monitor until the end. :-)
I want you to reveal your face. ALSO YOUR ACCENT KILLED ME LOLOLOL
He has done a face reveal already
Your cat is so thicc
Epic video. I enjoyed the cat & thinking about what parts changes might do both in theory and in practice. Need to watch this a few times!
Strange looking charger! almost a 3-in-1 device!
Charge your phone with it for a while to preheat it for more plesure.
So the third one is for girls only
@@ex-soldier4341 lets not jump to conclusions now
@@lakiza55 that's what came to my mind a toy that rumbles😄
I've learned to never insert something into my ass if it can detach, that's how I got the nickname "the slot machine".
Any viewer still alive? Yes, i am!
I figured only 1 12-24V spring contact was used, so when you made your leakage test you used both, one of which was not hooked to anything.
Is the connected one that is tested
"The LED comes on with no explosion" I love it how casually he is saying that haha!
That buck i.c is a bit limited so i'm not supprised that the output is weak, i've never seen any car adaptor that works well with that chip alone.
That flyback reminds me of those cheap 12V,5V supplys for hard drive caddys, very cheap and minimal parts, but they do have a mosfet to drive the primary.
The "Ring" power adaptor uses a fet on the output, thats much better :-).
Your cat is loverly, it wants to be near you even if it is being a pest :-D
Pls test the dso138 oscilloscope
oscilloscope*
USSR осциллоскоп сделано в СССР is much better, because you can use it after nuclear war
Great video. Unbelievable how dogie this and many other products are. I test all my switching power supply wall warts now from mains isolation after seeing yours and Bigclive's videos.
I guess I have been lucky. So far most of the units I have tested do put out rated currents. THANX.
Thhhaaatss naaaaicce
If it's a fusable resistor which also works as a fuse it's GOOOOD but if it's a normal resistor it's not so GOOOOD
I love your voice dude
4:17 is it me or he is saying “no he cage “
U are simply great. I love your all vidios. U explain the function in detail. But I couldn't understand the purpose of 1k resistor and 10nf cap. Kindly explain.
the ultimate cost cutting version will have the mains directly connected to the USB +5V and GND. no other components.
Wow this will need couple years to charge something with 4000ma🔋 😁😂😂🤣
Yeah still alive till the end. I like when you play around with the components and then we can see what the differences are in the output. I was expecting you to put a full bridge rectifier on it.
After increasing the smoothing capacitor capacity tenfold, the bridge rectifier wouldn't have any significant effect.
@@DiodeGoneWild Right. Thanks!
Under no load, 6 volts is ok because it doesn't hurt anything. Also, the charger originally was perhaps deigned to be used as sex toy. Chargers Gone Wild!
I was repeating the words “full bridge rectifier” for half the video
We looove yoour accent
Thanks sir… 🌹💖🇵🇰 I am pakistan 🇵🇰
I wish i had seen this video before my exam (it was on the 14th). It would've been a straight A (6). :D
This is kind of dodgey
Useful video 👍 very good
Can you show us the step by step process of how you draw out your schematics?
Thank you for all the great episodes aslo.
I think it takes about half our of job
I love the different experiments you did on the component values. It's hard to beat the instructiveness of just showing what different parts do.
why dont u try bridgerectifijer?????
I am still alive 🤣😂
Ave will finally have his rectumfryer.
Dôdgeee
Nice cat , thanks for the video
Super lesson. Please make it more. Bay.
The USB connector. Which is a little bit rusted. That's nice!
The connector may be reused from scrapped electronics, just like many other components in those cheap Chinese devices...
@@DiodeGoneWild I watched a video on RUclips of salvagers in Shenzhen. They were pulling parts off mountains of boards. Then they'd bale them all up and ride them on the backs of bicycles. You're probably better off with pulled parts than the counterfeit ones anyways.
I have the same chip in my car charger and it gives me 1A at 5.15v so it's possible to improve the circuit to make it quite useful.
And it also would be cool if you added some optocupler feedback to the mains circuit.
Anyways this kind of video where you're improving shitty circuits to make them something useful is way better than just a circuit overview videos, thank you.
Your cat wants to replace the fuse. Great review.
Appreciate you showing us the scope, a lot of YT channels can't be bothered with the second camera setup to show the scope... but it makes it loads clearer what the circuit is doing.
Cat probably hears you talking when there's no one else there and decides that you must be talking to her - I've got gamer friends and their cats all want to walk all over the keyboard when they're talking on the headset.
The cat usualy lays on the bench before I start talking. It seems that the cat's are attracted by something else. Maybe they recongnize when you are just about to start doing some hard work and they want to be helpful or learn something new or have some fun.
What if you put it in car then connect a 12v-230v converter to it and put in in 12v too same time
In a car to mains for 240v, they use 24v for car. I think it would still work tho.
DiodeGoneWild Hi
I just rewatched this video. I think it’s one of your best about smps. This is because you show the effect of the different components by changing their values. And showing the pwm signals was also quite informative.
Thanks 🙏 (to you and your cat of course).
They got the 1000mA rating from trying to charge a chinese made "500,000mAh" battery, in about 41 days.
I like that Russian oscilloscope!
13:38 Cat vs. fuse
LOL DGW. Your cat wants your attention. I love watching your videos - I’ve seen almost every one. I can’t get enough of your interesting English accent and well-explained and entertaining videos. Please make more at higher frequency :).
I see that the flammability rating of the PCB is only UL 94 HB (horizontal burn; limited rate of flame spread, but not required to self-extinguish), to add insult to injury. (From what I've seen, reputable manufacturers mostly use UL 94 V-0 rated boards. The next rating down is V-1 which takes a bit longer to extinguish, then V-2 which still self-extinguishes but can produce flaming drips.)
Why not to try installing a bridge rectifier and an optocoupler?
looks kinda sus ngl
Diode REALLY needs a proper USB constant current load. The fucking around with 10W resistors is really painful to watch.
The shitty (and inaccurate) USB meters are also a fail. Go and buy a Ruideng meter and load, they are cheap and surprisingly good.
Very cute cat 😄😄
Are you singing?
my scarger outputs 15volt into usb and my phone doesnt charge now.
Your charge circuit is G O N E
it is fast charge charger to samsung that needs 8-9v from usb ;)
Why didn't you replace the zener with a proper opto-coupler and replace the single input diode+1ohm resistor with a proper bridge rectifier *_as well_* as the 22uF 400V cap and 5ohm (10ohm*2 in parellel) resistor mod you already did. I think it would work much better then. Thats what i would do.
Thank you very much for this video - I was in dire need of your evaluation of these cheap flashlights! We used these flashlights for years for our security guards! Nobody of course had a clue about the safety of the chargers!!!!
Yeah chinese is like a girlfriend which has no garranty 😂😂
*guarantee
Hello,
Sorry, but at the beginning of the video, the AC leakage tests are not correct: the AC loop cannot be close as none of the charger terminal are connected to ground (except through your own body!). Insulation between primary and secondary sides must be performed from the live or neutral terminal against the output USB terminals and also DC inputs. (With lots of precaution, of course)
For a product of may 2019 all the interiors, mainboard, circuit etc. seem to be completly outdated (again). Maybe thats why it was cheap to buy and low on quality. I still wonder who wants to put such designs to market? and ship it around the world. seems to be completly useless. from outside it looks nice in the first moment, but thats no excuse. this looks like a piece of crap. produced to get other peoples money out of their pockets. better throw your money directly into a bin. would be better for the environment as well. and the chinese producer of this crap could just as well start an online gambling businesss to the western world. he would make more money from it more easy - for shure! (thank god, we have a regulated market for gambling!)
I like your w
13:40 , the cat was trying to explain the secondary circuit😂😂
Salam kenal subscriber dari Indonesia. Cara anda menjelaskan sangat saya suka walaupun bahasa inggris agak kurang jelas...tetap semangat ya...👍😁😁
my charger for my phone is original but the output is 12V with fast charge. with normal output is 5V
A swiss accent eh?
I dont recall Gipetto talking to Pinnocio with that accent. It was more of an Itallian accent if I remember correctly. Maybe cause Gipetto was Itallian Swiss? But then maybe Walt Disney felt the public wouldnt accept an unusual accent?
So the PCB and original design was almost acceptable but they cheaped out on the components. I think the loss of input bridge was a big loss - the 1ohm was probably there because the board was laid for the bridge.
@talonfluff No, everything is not fusable, the electronic components marked as fusable often fuses for a certain max current meaning it become open circuit when it fuses for an absolute max rated current. But the components not marked as fusable often become short circuit, remember this difference!!
Cat likes fuses :P good chalenge on improving the power supply as it goes.
the cat is smarter than me! me: what is EMI filter? 🤣🤣
ElectroMagnetic Interference filter :).
I don't understand, why 2nF capacitor is not charged from start up resistor? Please explain it. Thanks.
nice cat!
The snubber network is made from 1n4007, which is not a fast diode!!!
Why don't cheap products use an lm 7805 and some capacitors to convert 12v into 5v???
any Pakistani here??
I think the manufacturer said: Hey wait a minute, we are putting out way too much power to peoples devices for charging Lipo batteries in their phones and other usb charged devices. We dont want a fire or explosion caused by this device. We better limit the current to a safe level and cut the cost of making this charger at the same time!
Watched right to the end :) Your vids are the best.. Thank you!
cool.
You are a very good 'Teacher'. Will apriciate if you can make some DIY useful home gadgets.
Please do more of these long videos, you're the best teacher of this subject on RUclips!
you are overlooking that this is a charger. you dont want to overcharge tour lipo phone battery. You must take in consideration that as a battery charges up, its resistance increases so that is a built in safety factor for lithium batterys. the .6 current limit is more then enough to bring a battery up to full charge, and not overcharge your device batteries. the car charger offers a higher rate of charge because it may have a more sophisicated charge level limiter
Turbo charger usb output can be negotiated up to 9V. Also you test usb2 which is rated up to 0.5A.
This is a really dodgy one.....glad that you have your fire extinguisher. Cats are awesome.
I hope someone can help me out here. I’ll appreciate any hint;)
I don’t quite get the mains voltage part. The transformer would operate better at higher frequencies right? Was the frequency increased at some point or was every modification just about increasing the current on the primary side?
Secondly wouldn’t it have been an easy gain to replace the diode (1N5819 )on the secondary winding with a full bridge and therefore effectively doubling the current?
Thirdly: 13:47 “the feedback loop induces more current into the transistor” through the resistor and the capacitor. But a capacitor blocks any (DC) current. Is that why changing the resistor and capacitor values have hardly any effect? Should perhaps a FET have been installed in stead of a transistor?
Those are some good questions.
1. The modifications were to try to increase the duty cycle when the load is high. I´m not quite sure what changing the frequency would do in this case. But it won´t make it perform better necessarily. It could make it worse.
2. If you replaced the single diode on the secondary with a bridge rectifier, it would no longer be a flyback converter circuit: It would radically change how the device works, and it would no longer be possible to get feedback the way you can in a flyback circuit, among other things. Most likely it would just stop oscillating if you left the rest as it is and blow up.
3. Keep in mind that all voltages coming from the transformer are changing quickly, and are AC. So to charge it current has to flow through the main BJT´s Base, making it more conductive.
If you wanted to use mosfets instead, you would have to change a lot about the circuit. But in general you would be better off using a proper control IC, or at least an optocoupler as the feedback anyway since that is way more accurate.
Hope this helps.
You can also watch his video on the power supply of a DVD player he did a while back. He went more into the detail on how a flyback converter works in general there and explained it very well.
Basement ScienceE
Tx! I’ll go and have a look at the DVD video and then report back ;)
This is the video: ruclips.net/video/cX4q0e124C4/видео.html
Edit: watched 25minutes now and it starts to become clearer now.
Edit2: watched all 3 video’s. Re: 2. Bridge rectifier would prevent energy buildup in the transformer and therefor indeed change the fundamental principle of this circuit.
Re: 3 As I understand it, it’s not the transformer that is running on AC but it’s the transistor that steers the transformer by switching on and off. Isn’t it the transistor switched off by running enough current through the 10k resistor and thereby closing the other transistor? How is it turned on again?
I always hear "snapper" from you, instead of snubber XD
8 volt means fast charge or 4.8 volt
The fast charge is for samsung (and more phones)
Good Video
Is it not possible to have one input. Like 12v dc to 220vac?
Probably your best video yet. Many thanks. The experiments are very helpful.