Giant 19W LED Lamp + schematic + buck regulator explained
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- Опубликовано: 28 июл 2024
- In this video I take a look inside a big and powerful 19W LED lamp from Lidl supermarket, made by Livarno Lux. I reverse engineer the schematic of it and explain how a buck regulator works.
UPDATE: The control chip is BP2839A. The transistor is BPM5001.
WARNING: This lamp contains dangerous mains voltage! Risk of electric shock and death! The power supply is a buck regulator with no mains isolation. The entire circuitry including the LEDs is live at mains voltage!
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I loved the way you explained the switching buck principle; simple and, let's say, understandable for most layman's with a bit of electricity culture. I had an indian collegue at the facility where we worked as trainers and you remind me of him :)
Thanks :). It's even more simple to describe a buck regulator as just a transistor that chops the input voltage and the inductor that averages it. But this this simplification only demonstrates what happens with the voltage, not current :).
Your videos are very interesting and your explanation is very clear. I am a hobbyst from Argentine, and i learn a lot how things works with your videos! Thanks for your Time!!
thank you, each of your videos is an excellent lesson in electronics and reverse technology suitable for an audience of "technically prepared" users.
Keep it up, I have big problems with the law and I can't make payments to support your channel, but I never lose a single video. Again a big THANK YOU my friend.
LOVE THE CAT!
It's a good thing cats have 9 lives!🤣😝😁
Me too i love her
We need more cat, please
Clicking on a random video and hearing the specific accent of the RUclipsr I formerly watched and liked the explanations of was a surprise to be sure, a very welcome one.
Thanks for the video. So it's touching when you draw diagrams for the goods that make the review.
It was the best explanation I have visited about buck regulators thanks
Reverse engineer that cat and build a tiger....
Now I know what a buck regulator is thanks for explanation. I think your cat is great
thank you, I like how you explain about what and where it goes
Love your vids, always funny to see your antics with the cat. (Especially the other video where the new chair was for the cat (cat was shown sleeping on it) and the old one for you. XD)
Cool video. Your videos are much better than your subscriber count would indicate. I share your channel all the time. Also, I love your accent and your cat is awesome too.
SMD topcode girl is here! It's not BPM500, it's BPM5001. Both chips are by Shanghai Bright Power Semi.
Here's the datasheet for 2839A - you'll need to make use of translation software or learn the language: bpsemi.com.cn/uploads/file/20170712150025_360.pdf
Here the BPM5001 is mentioned: www.bpsemi.com/uploads/file/20170527170822_400.pdf
From this follows that it's their own variant of the 1N50 MOSFET.
Thanks a lot :). I didn't see the poorly printed "1" at the end of the BPM5001 :). This already happened to me with the LM324 in the breathalyzer. I didn't see the "4".
This will be my next project in breadboard .thank u so much for the Video with clean schamatic:) :)
This video is VERY good and I like your content very much.
Thanks :). I will keep making such videos ;).
beautiful cat ! 🐱🐈
Thanks for a very educational video. I learnt a lot...
Thank you for this great work. How does an interference filter work? And what effects does it have? Not all circuits have this.
Very good content sir. Thanks for sharing useful stuff. :)
Very well explained! Nice
1:12 cat going behind the door for being too curious about this gigantic lamp
man u got a subscriber i saw every video of urs .
Love your videos😀😀
How can we make the capacitive dropper DC supply that we saw in previous LED teardowns according to our requirement? for common voltages like 5V, 12V, etc.
Thank you!
Always a plesure to watch your videos thumbs up, and keep it up!
How to make a solder joint for this your transformer soldering iron?
can we use bt136 triac to reduce voltage...
Nice video. I liked the part with the bite and than you closed the door 😅😅
How do you measure ac current? Switch the meter to ac amp function then put the probes in series? Can you draw the diagram please?
Can you give me the specification of the power transistor please? Thanks.
Brilliant Video...Greetings from India...
Thanks for this video its interesting to see how these things are made. Its good to see that at least this time its something a bit better than a capacitive dropper. Could I ask if maybe next time you get a LED to test you could bring an AM radio near to it just to see how muck noise they make as a radio ham thats always a concern thankyou Love the cat I think shes great
As always very good... with that funny sense of humor. Keep going
Ps: do you still have real absinthe in your country?
I miss cezky krumlov
Nice lamp, worth to put it back and use it....
Interesting everything about LED
What is the CAT mode on the multimeter?
I bought two lamps of this type in November 2017 from Lidl. One year later both lamps failed, one after the other within two weeks. Lidl does not provide guarantee for them and my claim for the damage was refused.
I dismounted one of the lamps and checked the incoming DC voltage. I got 34 V instead of 124 V seen in the video.
Any idea about fixing the lamp?
you could check the LEDs first, if they create a shortage. with a dual lab power supply and current limitation you could check partial segments
Great video, nice to watch as always! Btw. I think that your Watt meter needs calibration. At 73mA it should show power 16,79W not 20W.
good job thank you
The 8 PIN IC is a N-channel mosfet made by "Bright Power Semiconductor" (bpsemi) in Shanghai I believe though I can't find a datasheet for it
You have great channel.i just starting watching. Mark Potkovac
I enjoy your videos a lot but i have some question. In the video you wonder whether the heatsink can dissipate 20w. I am under the impression that LED lamps are very efficient in converting electricity to light (radiative recombination, isnt it?) and therefore the heat losses that the heatsink should have to cope with are not the total power consumption of the lamp but only a fraction (20% or something?). Therefore i really think that it wont have to dissipate 20w but rather 3-4w.
LED's efficiency is about 25% (luminous power vs electric power), so for 20 watts lamp heatsink have to dissipate around 15 watts of heat.
Did the scale also come from LiDL?
Must have, it's their store brand.
I'm not sure but I think that my girlfriend really bought it in Lidl.
So if someone asks - What's the CAT rating of those multimeters? That cat is sure determined to rate them. 🐱 As for the light, I don't think it will fit in many light fixtures. I ran into that problem before when I bought a 11W LED bulb in the early days of LED bulbs and it was a similar size.
I only use multimeters approved by my cat :). The LED fits my big reflector-shaped kitchen light.
It would be good to use the lamp and see if it lasts, i do like the idea of more leds, and a neat little buck converter :-D.
Never heard of that number, it's a typical mosfet pinout, perhaps 600v at 5a.
Your cat just wants to learn too :)), loverly little frend :-D.
Love it how all cool electronics guys own cats.
I have had several cats myself, unfortunately the apartment me and my gf currently live in is her sister's who has left for Spain with her husband, and they are worried about cats damaging their furniture, so the two cats i still have are living with my mother now.
Still, that did not keep me from rescuing a small kitten from the cold last month :), but we only kept it for two weeks and then gave it away to a friend of mine.
I have always been a cat person. Have also owned a couple dogs when i was a kid. But no matter what dog lovers say, dogs are significantly more difficult to live with and care for in an apartment, also, they smell. And they can't purr which is a shame. :D
Hi, thank you for this very interesting video. Is it possible that the control IC gets so much volts at pin 6 ? the voltage divider, using the values of your schematics, gives out 67V. I was expecting lower voltage value. Thanks.
there is most certainly a Zener based regulator inside the package that brings the voltage down to a more reasonable voltage for the gate drive.
@@HPD1171 thanks.
I bought an expensive led light and now it flashes on and off when plugged in, and suggestions, can it be fixed?
some buck regulator chips have an over current protection and shut down and try to restart. do you have some leds that cause a shortage?
Please check the temperature of the pcb and led while running.
how do you measure power with a multimeter the yellow one i mean ? :)
This wattmeter is built into the power strip:
danyk.cz/wmetr_en.html
or actually a power to volrage conveter.
Dobrý den, sledoval jsem vaše vídeo, mám nškolik žárovek ,kdy odešla leddioda.mohu je hodit do koše, ale zajimálo mne proč odešla..Začal jsem měřit a zjistil jsem ,že na lediodách je velký proud, 95mA. Proto odcházejí.Jedna dioda 3,3 v - 55 mA. x 8 kusů. Jak snížit proud do ledek?
at 1:45 how is the meter showing power as the dial is set to dc voltage?
He made special extension cord, but I am not sure for the name of the IC.
I have a 27 Watt Philips cool led lamp. The cone heatsink is halfway up the bulb shape. Usage is 25.2 Watts at 200 mA. weight 242 grams.
Nice channel. Excellent.👏😮 🇲🇽🙌
Hahahaha.. poor cat 😂😂 btw i really love ur video n ur deep explanation about how the circuit works.. easy to understand even for noobs like me.. keep up a good works.. also u have funny accent 😁 (its compliment btw).. subscribed 😎
What is this 10f capacitor
I like the circuit, although I'd be a bit worried about the output capacitor going bang if the leds failed open.
That Is One Big LED Lamp!
LOL. Já takovou vyhrabal v elektru kam se dávají nefunkční věci, vyměnil tlumivku a jedu dál. Svítí krásně
Hi! 230V x 0,155A = 35,65W. Than what does that 19W stands for?
You forgot to take power factor into account. In many AC circuits, not all current is real, inductors and capacitors create phase shifts which distort measurements made using basic tools.
your cat is a superstar
reason why i sub this channel just bcuzz he alway explain schematic
Diodeeeeeee very niceeeeeee 😁
The LIDL supermarkets in the UK don't stock those 19W LEDs! Which is a shame, as if they did, I'd buy a few for my use (and to replace a crappy CFL in a PIR spotlight).
As it is, the crappy spotlight is getting either a Poundland LED or a tungsten lamp.
You can get similar LED bulbs at home bargains, rated 1500 lumens for £1.09.
this led lamp has ok non-isolated constant current driver but 20w will kill in quite fast. It is way too much heat for so small area and anemic heatsink. It would be too much even with forced air. In short engineered to fail.
you're awesome.
4:25 zero ohm resistor...interesting, I wonder is it cheaper than a wire? what could the the material for this?
Just a piece of wire. But they can be picked and placed by a machine just like a resistor. So, good to use when you need a jumper.
Yes, zero ohm resistors are used as jumpers. A machine can easily position them just like resistors. I have even seen THT (through hole) zero ohm resistors! It's a resistor with a single black band.
I have first seen these a a few weeks ago, when i was troubleshooting the crossover board of a Cerwin-Vega subwoofer amp. Seemed strange to me - that board had both zero-ohm 1/8 watt size resistors AND jumper wires. The only reason i could see for that is that for fixed size jumpers, the resistor type packages can be fitted by the pick and place machine rather than inserted by hand.
it is much cheaper as placing another resistor is just a change in the layout program than designing a pcb or worse manually soldering.
yes, very goooooooooodddddd
Cat just wanted to help hehe
This time the cat was really keen on helping me :).
@@DiodeGoneWild your cat looks like a exotic shorthair
That's a quality kitty you have there. Give that kitty a snuggle for the internet.
i have repaird an old led thas 10 jears old now
2x 400v capacitors has leaky ond lost ther capasety i replast them end now th led works agan the led hat 810 lumen and it has a big heat sink to
The package is pretty typical for a MOSFET. They use the larger package for more current, better heatsink and greater clearance.
Very nice explanations, i think you must follow a teaching career because you know how to explain things. Lidl supermarket sell allot of well made stuff. I got allot of small tools and other miscellaneous appliances , from them, and seems well engineered.
Do the two capacitors....10u and 10n.... make a capacitive voltage divider? If so, the values seem off. There is always 124v on 10u, which means there must always be 201v on 10n. Looked up capacitive voltage divider, and it's just like a resistor voltage divider...except smaller capacitor has higher voltage. In this example, it seems like the 10nf should actually be 5UF.......(10u / (10u + 5u))×325 = 201. For 124v, (5u /(10u + 5u))×325 = 124. I approximated my values of course.
Thought?
C5 - 10nF is anti interference one. Normally they use Cy caps, that fail open - according to the drawing it's just 1kV cap.
Are you from Czech Republic?
I think they are 8.2/2 for 4.1V per chip. Short wavelength chips, high efficiency phosphor.
Lately i saw this giant in shop "Biedronka" in poland :)
I wonder what is the actual purpose of shorting with 0 ohm resistors instead of making a simple joint with a blob of solder .
You buy this in lidl ? I from poland and lidl is in there
Yes, it's from Lidl :). Definitely a bit better than the ebay ones.
:)
Aww your cat is cute
A couple suggestions:
Get a desoldering tool. A hand operated sucker tool is what I usually use. It sucks the solder right off. There are also vacuum pump ones made to operate continuously but they are ridiculously expensive. You can also use a desoldering braid, which sucks the solder out when you lay it between your joint and a hot iron. Good for getting in tight places, or small bits of solder.
It would be nice if you measured the temperature of the LEDs and heat sink. Then putting the bulb in a fixture, enclosed, connector up and down, or open, to see how hot it gets. I'm very doubtful that this bulb will last very long.
Another interesting measurement would be the frequency of the chopper. You could do that with an oscilloscope if you ran the chip off a low voltage power supply. Or an isolated 300 volt DC supply to power the whole circuit, but those are getting rare.
You can build such a power supply with not much difficulty. If size is not a concern, two UPS transformers back-to-back will do great. If it is, a SMPS with say two ATX PSU transformers back to back (if you are too lazy to wind your own). I have found winding SMPS transformers very easy as the higher frequency requires a lot less turns than a comparable 50Hz one.
A well-stocked junk box will have two identical 120V to ??V transformers at 60 Hz that you can rig up to be an isolation transformer. Never throw anything good away, I always say.
When I was young and foolish I built a linear 300 volt supply out of a 40's era radio and a 6L6 pass tube. I wish I still had that.
I'm surprised that the full current is going through the control chip. It seems unnecessary.
I was also surprised by this, but this may actually be what obtains the power for the chip. The 510k resistors may be just for the stratup. Maybe the current from those resistors is not enough for the chip, so it powers itself in series with the transitor (probably only for a fraction of time the transistor is on).
That's not unusual. The pins going to the source of the MOSFET and the current resistors are probably shorted together internally, or have some resistance. If they're shorted it just means they used the extra pins to more easily connect things to, or if it has some resistance they use that internal resistance to program the minimum current sense so the chip won't go into run away if the current sensing resistors go open circuit.
Are your phone from poland??
Vast knowledge
Your cat is so cute
jak tam vrazí ten šroubovák "you dont see anything" :-DD
seem like a reasonable design but I believe parallel LEDs in parallel needs them to be more underdriven to increase the average life of the lamp
I wish that they would start using fans and better heatsinks on the led bulbs!!
Nice 🐱 i love it
Bude nějaký vánoční speciál??? Pokud tedy bude čas:-)
👍👍👍👍👍
What is your cat's name ?
just as a thought: that lamp will not last very long; it has an insane working temperature. To heatsink 15W (5W is emittted as light) needs definitely a bigger surface area.
bit of light is also absorbed by the plastic cover. This lamp is just not meant to last.
Yeah, the heatsink will go over 90 degree celcius easily wih that thin slab of heatspreader only (not even a heatsink)
Nice cat
This is the closest I could come to for the switching transistor:
www.bpsemi.com/uploads/file/20170527170822_400.pdf
It looks like the case style is a BPM5001 (look again at the chip. It has a "1" at the end under the flux). For some odd reason they decided to put the case style on the package, I think. The MOSFET is supposed to cross to a 1N50. Although the 1N50 can handle 1.3A and 500V, none of the 1N50 MOSFETs I look up have the same case style as the one you have.
A ZDS020N60TB MOSFET has the same 8 pin SOP case style, and can handle 630ma and 600V. It's probably that one or similar.
www.mouser.com/ds/2/348/zds020n60-312685.pdf
Edit:
Derp. The BPM is from the manufacturer Bright Power Semiconductor and they claim it's their version of a 1n50 although I can't find that on their website. I'm so confused.
The control IC is theirs too. I suspect it's their old lineup of products from before they started marketing towards international manufacturers, this is why they won't show on the English language website.
Did you fix the printer, or did you "fix" the printer? :)
Someday introduce your cats in your video i really love your cat
Where is the powercube remote teardown??
I have to get it for Christmas first :D
OK
I watch your videos evry dey
Please don't throw out your cat next time I love him ;_;
I just didn't want the cat to stick her nose into 230V :).
DiodeGoneWild yea 😂😂
I adore cats too but not in front of the camera on the schematic, she completely distract me and prevent to see and focus on schematic, if this is serious channel he should let the cat out and for safety reasons too
@@technixbul The cat is a part of the channel's appeal.
It makes the content so different and, in my view, more appealing, because DGW don't take it too seriously.
And if you are interested by the schematics you can ignore the cat effortlessly.
True rms ?? XD
Your cat looks like clouded leopard.