Electronics > Projects, Designs, and Technical Stuff

Reverse engineering of a chinese Li-Ion charger

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Mechatrommer:
thats the stereotype ;D transformer is inherently an inductor (inrush limiter?) and i dont think primary will draw much more than 100mA. consider the whole thing as a fuse cheaper than brand name one. osc bjt can fail first, or the small transformer etc one way or the other. but the fuse with me here is resilient.

thexeno:

--- Quote from: Kjelt on December 27, 2019, 09:33:13 am ---Where is the fuse  :scared:

--- End quote ---

There is a small wavy PCB trace on the back, used as a PCB fuse I guess. I think it will blow with 500A, but still..


--- Quote from: Mechatrommer on December 27, 2019, 08:03:40 am ---few things to note, transformer is very small type you can usually find in samsung/smartphone charger. and few hot lines are very close to secondary circuit (although masked).

--- End quote ---

I am pretty sure in the proper ones the insulation does rely on the paper between the coils, differently from this one (check the video I linked).

Kjelt:

--- Quote from: thexeno on December 27, 2019, 01:05:25 pm ---
--- Quote from: Kjelt on December 27, 2019, 09:33:13 am ---Where is the fuse  :scared:

--- End quote ---

There is a small wavy PCB trace on the back, used as a PCB fuse I guess. I think it will blow with 500A, but still..

--- End quote ---
Ah now I feel assured  ::)
I wonder what an insurance company will do when such a chinaquality device is the origin of a fire.

JacobPilsen:

--- Quote from: thexeno on December 26, 2019, 08:40:18 pm ---I don't think I can do anything, legally speaking.
--- End quote ---
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thexeno:

--- Quote from: JacobPilsen on December 27, 2019, 06:46:30 pm ---
--- Quote from: thexeno on December 26, 2019, 08:40:18 pm ---I don't think I can do anything, legally speaking.
--- End quote ---
Verein für Konsumenteninformation
Europäisches Verbraucherzentrum Österreich

--- End quote ---

Hi, thanks! The problem is that I am italian and that happened in Italy.... despite I live most of my time in Austria.
But yes, I have to look if is worth reporting stuff or not.

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