Li-ion drill charger analysis (with schematic, measurements, waveforms)
Вставка
- Опубліковано 1 жов 2024
- Today, let's see what's inside a switching charger for a supposedly 36V 9000mAh Li-ion powered drill / screwdriver. This charger was donated by Voltlog. I review the charger, he reviews the drill and battery packs in his video:
• Voltlog #285 - Is a Ch...
You can support me on Patreon:
/ diodegonewild
Awesome analysis of this low cost power supply 👍 The control chip is a mystery as the part number brings up a different chip but maybe the viewers know more about this chip and will drop a link in the comments Thank you!.
cand am vazut numele eram sigur ca esti roman. interesant canal. keep it going
Thanks but me and +10k people wont check your channel
@@mystcat3 go in other place to get atention
@gabsr you can tell by your little kids channel and your little kids comment you need to
grow up.....
@@kermets At the end you didnt even checked his channel
Maybe it's "36v" because you get TWO 18v batteries with it??
good old chinese trickery haha
Even so it's still not 9,000mAh :p
Most laptops nowadays aren't even 9,000mAh!
He just didn't found the series adapter in the box, allows you to screw it faster, literally
@@TheSpotify95
You get 10 1500mAh cells. In chinese terms the product is underrated. It should be 36V 15 000mAh. ;)
china logic at its best
"You can't trust it, you also have to use your brain." (20:00 ish)
Words to live by.
The listing says "brushless" because the brushed motor is probably so crappy, the brushes will run out within minutes of operating ;-)
Yep, no replacement brushes, thus brushless 🤣
maybe when it will run out of carbon brushes will continue to run brushless on air gap 😂
So they didn't lie
I bought a china drill because it had the same batteries as my impact gun but cost less than batteries on their own. The drill works really good
14:49 “The wires are quit thin”
Those are fusible connection wires. 🤣
My car actually has a similar arrangement. The main power wire coming from the battery is actually a fusible link, so in the event of something melting down *hard* (which I've had happen when the alternator failed short circuit), that chunk of wire will melt and sacrifice itself for the rest of the car. That being said, I don't think this thing is that...
@@uzaiyaro
Such a wire that ‘sacrifices itself’ can cause a fire. I think that’s how a lot of car fires start. The wire from the alternator you the battery should be quite thick, so I wouldn’t like it to burn. Or maybe I’m missing something.
@@Conservator. i think in theory you are right. I don't actuslly know where the sacrificial link is, but I'm assuming its made a certain way so that it can melt and break the connection in a controlled way. The problem with DC after all is that there is no zero crossing point. So if something arcs over, that fucker will keep going as long as it wants. You need a way to break that fault current.
Maybe I can take a look at the loom in the old car-I believe it sits in between the alternator and the battery.
The important thing to note is that it is a factory wiring loom, and it is there for safety. There are many other fusible links in the car (as well as self-resetting circuit breakers) which are designed for things which are allowed to draw a higher than wire rating current for a short time, i.e. surge currents, think about things like the lights, or the thermo fans. Things which draw huge amounts of inrush current but then tail off. You wouldn't want the fuse popping every time you turned the lights on, and plugging your laptop charger into the wall etc. can draw many dozens of amps for a very short time, which doesn't even give the wire time to blink much less heat up.
But sorry for getting off track. The main tldr thing is that this fusible link isn't just two cheap normal hookup wires thst will burn in an overload. Its very likely a special type of wire which is designed to fail in a controlled way, and is designed to be present in the car to try to save the car from electrical fires.
But
@@uzaiyaro
My first comment was meant as a joke.
For large inrush currents you have slow fuses but as far as I know all automotive fuses are slow.
In a car you don’t want any wire to act like fuse.
Oscilloscope part was so hard to understand. You're a genius, I really enjoy your videos!
cat we love the cat A+
amazing content
the charging is probably terminated by the overvoltage protection inside the battery manager IC
At 5:52 when he says bridge rectifier his voice sounds like he is scared
I like how Big Clive from bigclivedotcom says it. It then sounds like "FULL BRIDGE RECTUM-FIRE" xD
Of course the phrase has been influenced by how Electroboom says it
markiangooley yes, ofc
Some sense of humour : D
Can you make a video about an power inverter?
I've got the same unstable signal 19:32. I did not know that playing with the trigger mode can stablize the signal. Thank you I've learn something today. Looking forward to your next videos with more tips how to use the oscillopscope. Seeing the waveform is really fun.
This guy is too smart for youtube lol
I like the video🧡💚
Someone please donate a proper DSO to this guy :) He'd really deserve it!
Niekto prosim darujte tomuto cloveku normalny digitalny osciloskop :) Rozhodne by si ho zasluzil!
He has a few patreons that easily allow him to buy better equipment but I think it’s a fun challenge for himself to do as much as possible with low/no budget equipment.
I cannot speak for him “of courrrse” but I like his approach.
Philips back in the mid-80s made a rechargeable razor which charged from 110 or 220 mains voltage and I believe it used an ASIC to do the job. Charging only took fifteen minutes and it flashed a green LED when it was done.
Thanks a lot for this for this excellent analysis . It was very interesting .
Indonesian:
Teknologi anda terlalu maju... 😆😆 saya pun tidak menduga kalau hanya menggunakan sedikit komponen😯😯😯
Salam dari Indonesia 🇮🇩🇮🇩🇮🇩
_______________________________
English:
Your technology is too advanced ... 😆😆 I didn't expect it to use only a few components😯😯😯
I'am from Indonesia 🇮🇩🇮🇩🇮🇩
Brilliant video,thank, I have a power supply just like this one,unfortunately it broke, they are very cheap so it didn't matter, but I wanted to know why mine didn't work, I couldn't find anything obviously wrong so I assumed it was the chip. You mention there is no snubber circuit, that makes sense as to why mine stopped working, thanks again great video
Nice review video 👍
I love evenings with those vids. Keep it up Danyk, great job!
lovely video
👌
Hi Danny love your vids thanks for sharing your knowledge and humour.. great stuff : )
Why..why..your cat never talking to us,even a single meow😔
It did a nice purr into the microphone at the end of the video :).
@@TheSpotify95 not meow
spotify95 that was a lovely purr at the end, yes. Cats vary a great deal with the meowing: some almost never do, some will barely shut up if they’re awake...
all charging base stations just provide power well almost all.. what shuts off and balancces the pack when charging is the bms on the battery... now milwakee does not have a bms in any battery its in the tools reason why they are expensive its a ploy by th ecompany to make sure they can charge alot.. dont belive me crack open a battery reason 2 companies do this theres another one that i dont remember who.. is you dont buy batts often for years so to make sure they make money they put the bms to justify the prices.. if investigated etc... now ryobi and ridgid have bms in the batts... you can use the batts from these 2 companies for projects without worry a milwakee i woulndt theres no protection.. so the milawakee chargers why they are so expensive they have the chip in them....
so unless crack open a battery and see a tryiac or a mosfet minimum 2 of them on a heat sink then its not a bms its just a monitoring device see you need big mosfets to cut the power to the battery when they run low... we are talking 10-50 amps so if you crak a battery open and you just see tiny chips dont use it as a project dont belive me crack open a m12 battery theres nothing but 18650s in it.... crack open a ridgid battery and youll see big mosfets on it it cuts off the battery.. and wont let it cut back on until you charge it.. reason being you let the battery voltage climb by stopping the tool then you can keep doing this and screw the battery its how ridgid offers lifetime warranties on batts its a stipulation on how you get them that and slippage meaning they hope youll forget about the warranty and or the cost to ship it and go buy another batt...... ave did a piece on this.... so only buy ridgid or ryobi..... im not sure about other brands.. but i personally have ryobi batts the new ones the hp ones and thats a gimic too all hp batts are are 2 more tabs and the onboard electronics say hey im in a brushless and let you use the full ammount see some 18650s one cell can handle 20 amps mac for 5 seconds and 5 per cell for constant do that over a pack and you got your 50 amps to start up that blower or that drill for that split second... long story short this is why
Keep up the good work.👍 Great accent. 🇺🇸
Lol i got the same looking drill charger. But this one using type C plug.
Also has some printing below the caution.
Doliz Li-Ion Charger.
Model 18C215-100SL
Input 100-240V 50/60hz
Output 21V-800mA
Same looking and the same flimsy cable. I always feels scary when using this charger.
Tho being said, i didn't try to pry open the device. So, not sure whether it is completely same or not.
The battery looks like housing 5 cells, it said 21V 1.5Ah.
Lithium power, at least not Flithium.
It might be dodgy as well ? Idk.
One local youtuber has been to the factory of this brand.
And it has authorized service center, in my country. I've tried to phone them.
The drill itself is quite nice, i mean it works. I've just use it to drill my wall to screw battery-less door bell.
Almost all makita 18v devices are brushless since about two years or something
not confirmed for DDF48218V -- ua-cam.com/video/Xh094MCHL6o/v-deo.html
What is the purpose of air-gap in these transformers?
Is it to increase saturation point? Increase reluctance? Decreases the effective permeability of the core, or permeability?
When are air-gaps used? Why flyback converters need an air gap?
So many questions, so little answers that don't lead to even more questions :(
It's to prevent it from going into saturation at which point it is no longer inductive but only resistive.
Hi! Thanks for this review, I would like to contact you for talk to a modification of these china batteries. Please let me know how to contact you.
Its look interesting and probably dodgy :-DDDDDDDDD
If that size of battery would use 12 3v coin cells in series it would fit.
where i can see the schematic diagram sir? do you have idea
That's not an American plug
Quel oscilloscopio è una piccola figata!
His accent makes me laugh
2:13 Key word is "looks". The fact that the gearbox is PLASTIC means its complete junk. Id be even surprised if they sprung for sintered metal gears. Id bet its just a nylon ring gear pressed into the faux silver painted plastic housing with some cheap nylon planets, and a brass or powdered metal pinion gear. Edit: 4:30 Yeah its all plastic. That wont last long...
Would never pass a CE safety test with a transformer like that. Funny thing is you need to perform the same sort of safety tests and pass them to sell your equipment in to china !!! Don't you just love it.
I have a Milwaukee charger and 120 volts was hooked up to the 12volt dc output.. it popped something with a bang. Can you help me find the parts to change if i send you pictures of circuit board to give me an idea how to repair it. Thanks.....mike....
install current regulator and voltage regulator
25:48 🐱🐱🐱
The transistor won't get destroyed by a high voltage spike if its body diode is fast enough!
35V is nor for the voltage is for other thing
Hi again Diode, have you sped up the playback on this video? I ask as I have always watched all your videos and this one seemed like you were speaking faster than usual. A little too fast at times, almost like the terms and conditions parts of the radio adverts here in the UK. Awesome work and content though as usual :) Al
👍
What terminates the charging? Is it the charger, or is there some circuitry in the battery pack? Neither... The LED goes green and then you unplug it!
All the battery management is inside the pack.
@@douro20 I thought that was the Battery protection circuit. The battery protection circuit shouldn't be used for charge termination!
@@chrisg6597 There are some products where it is, even using the protection circuit of the cell (when a protected cell is used). This is what they rely on on for changing the colour of the charging LED.
@@threeMetreJim I must admit, I was quite surprised that the off load voltage of the charger in the video wasn't slightly higher, and as you say, use the over-voltage protection to terminate the charge. In this case I don't think the off load voltage is high enough for this to happen, so there will be a constant (somewhat low) trickle current. Continuous trickle current or over-voltage is hardly good for longevity of the cells however.
@@chrisg6597 One of the older models by 'Sealey' (one using 21 and 5 single leds) uses this method for charge termination (and it isn't a cheap brand). It relies on the protection circuitry of the cell inside, the charger changes the led colour once current is no longer being drawn. I only know that as had one to repair after someone burnt out the charging resistors using a charger that was of the wrong voltage - the second time it happened I refused to repair it, they decided to switch on the LED's while charging, blowing most of them as well as seriously damaging the board from burnt resistors.
How do u come to know the dot polarities of the switching transformer..??
Plzz help me out..🙏🙏
Nobody care the the DC adapter, everybody just wanna see this little fluffbumb :")
What is that accent ???
Incredibly bad false advertising but also incredibly good value to get a working drill with 2 balanced protected batteries and a real planetary gearbox for just 45$. Some home improvement store would give you "rechargeable" 24v Alkali-Mangane batteries which only do 5 cycles or so.
What a poor design of psu, would an opto coupler and tl431 be so expensive, no.
Kick it into the nearest bin Danyk lol.
I opened up my makita drill and charger was only transformer with rectifier. There was 4 batteries in series with no electronics on the side what so ever. There was only 1 button for on and off.
Great teardown. Got to love the Chinese with their trickery and false marketing ;).
The charger is just as bad as the batteries and drill :D only really worth salvaging the components (except you can get better quality 18650s from scavenged laptop battery packs).
I'm curious what you think about your new digital oscilloscope. Perhaps a topic for a future video? I was looking at the same model on AliExpress/eBay as it is the lowest cost DSO that has MHz bandwidth -- but I hesitated buying it because the probes might suck, or the DSO software might be terrible, etc...
It was covered in a video 2 years ago, probably just after this one
For reference: ua-cam.com/video/gCI0S3Bcofc/v-deo.html
"thats ridickoolooose"
my son has a battery for diode to test.
At first glance before I watch video, the PSU looks like a .5 - 1amp at 24v
You get what u pay for ...
Actually, thank you very much, I benefit a lot from watching the video, please explain the battery checking device to us
hi sir. i love all your videos as I Iearn a lot from them. Would you also consider doing a tutorial on computer AVR and how it works? thank you very much!
That's the best junk power supply you have examined.
Actually one of more decent circuits among super cheap chargers.
Current limitation probably relies on those insanly thin wires.
I've seen that jittering triggering before on power supplies with really high dv/dt stuff going on, a snubber across the primary would probably solve it.
Dodgy....
That charger is actually not too bad. I would use it. Ive definitely seen worse.
36VF is actually a model number ，haha
Hi.Thank you for sharing your knowledge with us, keep countinuing
What's the max input voltage of that tiny scope? If it's not attenuated, you'd think that flyback voltage would damage it.
It's 40V, but I use it with a X10 probe.
Really looking forward to the oscilloscope video.
Oscilloscope review please and link to buy one
Hdo ngomong opoiki gak ngerti
His handwriting reflects his accent very accurately
kinda impressive tbh
Nicely done
"We asphyxiate your support".☺
What's the model of this nice tiny scope?
Lithium five battery that will not be powerful
Merci de mettre la traduction dans vos vidéo pour nous permettre de les suivres dans notre langue meri
Good ❤️🌹💯👌👍
This drill smells like China.
You should use obs next time.
sjupr skrjuuuuebl dodžy
black makita is brushless :D
Very nice collaboration
Really nice thanks a lot for hard work!
I just came here to hear him say 'super jodge' it makes my day
Co to za tester masz?
Buyer beware
awesome work
What a funny accent, :D
Yo, that's gonna be very interesting to watch!
Beauty!.
Omg I've got one of these chargers
The usual X2 chinese marketing...
They supply two batteries. That's 36V in series!
That looks like a cheap homemade power supply!
16:00 will be blink LED on start charging ? )
Can’t you understood not english?
hai from india
Hai
So those white resistors are fused, that explains why mine went open without any visible damage. Odd no-one's mentioned it before.