Dimmable LED Lightbulb - INSANE Schematic!
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- Опубликовано: 15 сен 2024
- Teardown of a dimmable 5.5W 470lm LED light bulb from Livarno Lux. Rated 220-240V 50Hz. It is completely filled with a resin. Disassembly was a bit tricky. The circuit is a "little bit" overcomplicated. It has a double sided board with SMD components on both sides, even under the THT components. Drawing a schematic turned into insanity. It has BP3216 chip. The supply seemed to be a buck regulator, but actually it is a switching voltage inverter. This kind of inverter is capable of both step up and step down operation. There's no big capacitor at the output of the bridge rectifier, so that it can work with a triac regulation. The output current of the inverter is proportional to the average input voltage. There are 14 LED packages - Two chains of 7. Each package contains 2 LED chips. Total LED voltage is 40.7V. The LEDs are on an aluminium substrate PCB and a heat sink. This makes contact with another heat sink in the plastic body. This one cost 2.50 USD and comes from a local supermarket.
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This guy can do more with an exacto knife and a screwdriver than most people can do with an entire hardware store.
MacGyver
"this is diode gone wild & also i have also gone wild while drawing this schematic"- i almost died laughing !! 😂😂
Me too man😂😂
" i hope for another kind of circuit". Careful what u wish for 😜😜. 10/10
OMG. That schematic
They really took it seriously for a lamp
This arrangement is called buck-boost, the predecessor of a well-known isolated flyback converter.
This is a current contolled buck regulator. The internal high voltage switch is between pins 5/6 and 7/8. The current is sensed by the 2 ohm resistor connected between pin 8 and pin 1. The average input voltage is sensed by the network in the bottom left of the diagram (WTF?) and fed (under the chip) to pin 2. The chip regulates the output current to be proportional to the voltage on pin 2. So when used with a triac type dimmer the output current and hence brightness is controlled by the dimmer.
number 33
Thank you for explaining! Wish I could give your comment more than just one 👍;)
Just curious: where did you get your knowledge (and about these lamps)?
@@Conservator. I designed high reliability switch mode power supplies in the aerospace industry (mostly satellites) until I retired 10 years ago. That couldn't be more different from the mass produced, low cost electronics that DiodeGoneWild shows us although the basic principles are of course the same. We used to pay perhaps $100 for one Hi-Rel, Rad Hard transistor. My only knowlege of the insides of cheap modern electronics comes from the likes of DiodeGoneWild and BigClive.com.
number 33 Wow, Yes I can imagine that you’d use quite different design principles for satellite equipment than for a Lidl light bulb.
And with your explanation (and the video) I conclude that these bulbs aren’t even that bad at all. Thank again!
number 33 Hi again,
I watched quite a few video’s on smps over the weekend and the more I watch the more I’m aware of what I don’t know. I find it fascinating however how complex this subject gets once you get to the nitty gritty details. Dr Ray Ridley mentioned reliability as nr1 concern when designing this circuits. He also mentioned that it takes about 10 years to become a good smps designer. ‘Yeah right…’, where my initial thoughts. Now I think ‘Yeah right!’. Designing for satellites must be at the pinnacle of this area. Reliability, low emr, efficiency, low weight and certainly a lot more (though cost was probably less of an issue). By now I understand that the lidl circuit must have been completely trivial for you.
If you like you can email me at my full name at gmail. But if you do I might bother you with a question about electronics ;-)
I really, really love your teardowns!! Your hard work is very appreciative!
My friend you are very patient and professional.
The excavation goes on. Priceless! What a complicated circuit for a led lamp.
I thought you would test if it's really dimmable & how much it flickers when dimmed.
very complicated for so little money ,,,,,,incredible.............
I agree, he's gone to length to unravel what's inside.. I'm a power electronics engineer and yet it stuns me they packed so much inside this Sub $2 part. Most of the 120V US bulbs don't have such complexity. They just have a few parts and the LED stack. I'll add more notes later. Good Work, Mister.
The EU sets goals for efficiency + utilities complain if the lamps have poor cos(phi)
I admire your persistence and perseverance. Above all you do this with tons of humor. I laughed my butts off watching this one. I am like you've met your match! But guess what you figured it out as usual.
I think a lot of the circuit is about keeping the power factor close to 1 so it can work with standard dimmers.
Yes, this has almost no filter capacity at the output of the bridge. The
chip probably regulates the PWM so that the current is in phase with
voltage. This makes the power factor close to 1. And if triac dimmer is
used, the power varies with the triac angle in a simmilar way a
resistive load (tungsten lamp) would.
Yeah, it could explain the inverting buck converter and all those seemingly bizarre components if they were trying to create phase shifts everywhere. Also most dimmers that people have in their houses are designed to have a minimum resistive load to operate correctly since it goes in series with the lights, so maybe some of those extra components are to keep the triac in the dimmer happy.
The potting compound helps to spread out the heat and so should make the bulb last longer. These are inexpensive disposable products ... not intended to be serviceable at all.
Of course, but making 'unserviceable' things still sucks.
You service them by screwing out and recycling 😉
0:46
And it was then that DiodeGoneWild understood the meaning of "be careful what you wish for, because you might just get it".
Well done amazing effort . I would really like if you did a video to teach how to draw circuits from simple to progressively harder
I just can't get over how you were able to draw something so insanely complicated! And all of this for just $2.50? Seems impossible.
Binge watching. Enjoying your videos. 👍
Wild schematic, love it!
8:05 Look at the lower-left of the video. Something says "WTF?"
Meaning "What's The Frequency" most probably.
those tracks going no where....
Wow, somebody crammed all this into that... and then somehow they even got this assembled - soldered through hole components without SMD on both sides falling off... probably lots of glue under SMD components too. Manual placement of lots of components. Somebody goes through all this effort for such a cheap device...
I commend you for attempt at tracing it out, but to complete it, SMD desoldering would be necessary.
The way this LED was made is to make sure you will find it difficult or impossible to repair, so instead, you go and buy a new one. This is what is called: *_Planned Obsolescence._*
Richard WILSON
No, They are made to last very long at the expense of not being serviceable.
Planned Obsolescence = last not long and not serviceable.
incredible with so many electronic parts. How do you manage to sell so cheaply? Thenk You for the Video
You know what, since it's potted into selastic, i just remembered something. I was at a home improvement store to renew caulking around the bathtub, so i was standing there at a shelf of caulking removal compound - a chemical that releases silicone and acrylic caulking so you can clean it off. While i was there, a salesperson casually strolls by and says "Hey you don't have to buy this - just get get a solvent named 'turpentine substitute', it works exactly the same, and it's about 1/5th the price", and i was like "wow, huge thanks!". I have no idea what they got out of this - perhaps caulking remover was a brand name item, while turpentine substitute is store brand, so that's something they actually make money on. Maybe it was a store chain that was shutting down so they could re-sell brand name stuff to a bulk supplier but not the store brand stuff. Maybe the guy was already let go of with a 3 month notice so what are they gonna do, fire him twice? Maybe he just liked me. It was quite a while back, like a decade or so.
I never ended up renewing the caulking though as i had to move for a job, so i don't know whether that's true or how well it works, but it's very, very plausible. Probably beats picking out hardened selastic by hand. Also i'll never pick off and scrape off hot melt glue ever again, just spray or dab some isopropanol around the glue joint or the edges of the blob and it comes right off, works great!
Love your expressions, hysterical!!
The BP3216 is a TRIAC dimmable LED driver IC. It basically changes the voltage in the LED based on the input mains voltage.
dimmable led bulb, but this can be very sensitive to voltage spikes and it need the Surge protector. This have also sensitivity to demand side management signals in power line - you can see the small blinking as vibration for sec. ( in czech republic HDO signals)
1:13
Him:lidl
My subtitles: legal
Excellent analysis. Thank's for your job.
I love what you do. It brings back memories when I would teardown electronics and make schematics. Now I rather watch somebody else do it. Electronic porn!
To draw the schematic better check the connections with your meter!
really interesting video. one can tell you put in alot of work for this. bigups buddy
I just love the "invisible" flickering, as it hurts my head...
This is basically due to camera auto-shutter with shutter frequency mismatched with mains frequency. Actually this is also a reason why you never encounter some cheap LED bulb on a film set.
@@TheLukasz032 well, I did not mean flickering on the video, but IRL. Shitty LED bulbs flicker a bit.
The excavation goes on🤗👌😂
👍👍👍 but you forgot to check if it's dimmable..🤔
Brilliant! Thank you for your service! (And of cause its not easy for the producer to make some profit from it, too many parts, and a lot of them seem to be totally outdated for this purpose. Maybe thats why they totally covered whats in the socket? *gg*)
hahaha , we all gone wild following this schematic! :D
thanks mate!
3:31 Note the negative light projection!
8:55-9:06 Chaotic board tracks as an anti-reverse-engineering tool?
You are Brave Man.
Try tearing down a LIFX color bulb or a Phillips hue color. I’ve seen part of the LIFX one and it’s filled with the resin as well.
‘Then the insanity begins’
A normal day for me
Dismantled one of these myself in the UK (A Philips one) and that was 'potted' in resin as well. The most likely reason i could think of was the manufacturer not wanting it reverse-engineered. I see from the waveform that they are simply chopping the sinewave rather than doing anything clever with it. Looks like we haven't fully solved dimming LED's fed from the mains yet.
In the Philips lamp the resin was like putty, and impossible to remove without destroying components and losing all the details.
Actually, I suspect the main reason for potting is to reduce physical vibration from the high frequencies used in the switching circuit. In cheaper designs, this can cause bulbs to "sing" with an audible whine, particularly when dimmed, but if all of the components are not allowed to move because they are potted in place, it can make the whole thing much quieter.
In Schematic there is WTF ? Very left side..
But u hv done great work by drawing it. Tremendous
Probably it means "What's the frequency ?".
It's an import bulb by OWIM GmbH DE in Neckarsulm for LIDL
in this video you have the voice of one who had been drinking a little🤪
What a shame you didn’t try to dim it before taking it to bits … (chip application sheet specifically mentions it being compliant with Triac dimming anyway).
8:01 LOOL !
this is just crazy man
Your carrier is “KAKTUS” .....
??
@@yoshibros1111 @3:53, the cell phone screen, upper-left corner. :)
Yah yah yah slaps in face sh* t
Oh. Man. How you do it. I never have a patience to complete the drawing.
How you measure the power consumption by the DMM
Could you add bulbs playlist?:)
Need bigger fire extinguisher for that one lol.
Hi DiodeGoneWild, how does your DIY watt meter work? This very useful measuring for DIY jobs. Can you explain me how did you make it? Thanks for your reply.
Which is the reason why in the video we can see the light blinking continuously and not always a steady light. And how to solve this problem?
Shutter frequency or FPS mismatched with grid frequency. Also a reason why films in Europe have 25 or 50 fps as opposed to the Americas with 30/60. This camera also has auto-shutter on, which on professional film sets is considered a noob mistake.
Nice video
Hi Diodes - From - UKsuperrascal - As a Englishman, I think it is a complement that you have spent the time and effort to learn to speak english and is much appreciated by me, So to all the People that mock or moan about your accent go and get a life, You try to learn Diodes language, How many of you empty teapots will bother? - For more old english name calling Click my Thumbnail and leave a comment on my latest youtube video if you dare. - BRILL VID AGAIN BY DIODES GONE WILD - But you did not show the light powered through a dimmer switch - ? or was that the click bait -- LOL
Can you make a simple circuit using led strip?
nice job man
I freakin like this channel
The topology is inverted Buck.
"big jungle of madness", but thank you for all the work you put into the video. In theory you can unsolder the components and with continuity tester reverse engineer the crappy design.
5:50 It's heat-conducting silicone polymer
Hi there! I like your videos, because your teardown videos are very useful. You measured the bulb of performance with basic DMM. I guess your yellow DMM is 830b or similar one. How did you do it? Thanks for your reply.
He is probably measuring voltage drop in mV on 0R22 resistor in series with load.
omg.. you have a nice reverseEngineering background.. this is not an easy task.. nice job.. almost died laughing too. :) btw next time try to use some white erasing liquid.
that black stuff isn't resin......it's silicon,if you take your time, it comes off pretty easily.
thanks
Lidl market has Lidl prices 😁
You should have checked the datasheet of that chip, it has half your schematic on it.
díky za tvůj čas a respekt že ses do toho schema vůbec pouštěl :o
:) proč mluvíš s indickým přízvukem? xD
I am amazed by how much of electronic waste goes with this LEd lights when they die . Its a hell of a way to boil a Light ..
it when electronics are potted in resin. It makes it so hard to do anything with it.
Maybe its a three layer board?
saudações do Brasil + like. é muita eletrônica pra uma simples lâmpada LED. muito bom. sucesso.
can you do a tear down video of cfl lamp??
@diodegonewild Inverting voltage makes boost/buck regulator in one possible with single inductor.
Super video ale mluvíš trochu divně :D jako nechci tě "hejtovat" ale mě přišlo že si nějakej rusák nebo něco takovýho ale pak sem viděl czk a bylo to jasný :D jinak super video
How can anyone IC switch 400V? Even if it can, the closely spaced dimension between the pins do not allow it. Are you sure the ferrite bit is a inductor? Or a transformer?
The data sheet says: "The BP3216E integrates a 550V power MOSFET"
man i love your accent
I need to dim an LED tube with the input downsteped input of 120v 50hz... cant this be done flicker free?
Yes, it can. Use a constant current regulator with properly stabilized output.
the flicker went away without the cap. Odd.
The accent is similar to the Chynese water torture.
Look at the datasheet of bp3216 from bpsemi.com.cn it's a triac compatible led driver...
How apropos to the name of your channel.
Diode do you own a 3d printer?
From watching Big Clive videos, it seems the "BP" on the chip means Bright Power.... but I know nothing else.
try to tare down an expensive led bulb from phillips : Philips | MASTERLED 60 | 230 V | 7 W | 30-40 W it will amaze you !
Aren't all lights flicker based tho?
Technically traditional lightbulbs as well as CFLs operate that way, but you don't see it due to both material inertia (especially in traditional lightbulbs, where tungsten lights up from high temperature) and optical illusion. Cameras amplify the effect when set badly (frequency mismatched with FPS and shutter). LEDs can be driven flicker-free using stabilized constant current regulators, which is actually commonly used in professional lighting solutions for TV/film studios.
And Euros??
From wath country are you your country have lidl too
Czech republic ;-)
'
in here america is a AC 120 V
Best video so far hahaha
you are very funny, thanks
You are funny! 😂
You always keep saying that the flicker is not visible to the human eye. Although it is not blatantly obvious like on the camera, it IS visible (out of the corner of your vision for example) and more importantly it is affecting us (some people get headaches for example).
Anything that flickers more than an incandescent lamp is out of the question for me.
I consider a lamp like that factory rubbish if they don't bother smoothing the light properly. With this particular lamp it is beyond me why they made such an overkill circuit but still didn't even try to get rid of the flicker.
Light belb
čech ? tak to sme skoro susedia :D
'
dont need to put currency on the paper at 121...
not important to know about currency on the paper at 121...
many stores has different currencys tags