Phone charger

656

11:11:35

This is the schematic of a Vietnamese (fake?) Samsung phone charger, reverse engineered. In the simulations, the mains 220 V ac source and the rectifier stage (here disconnected) are replaced by a dc voltage source to circumvent limitations of the simulator (it cannot find solution otherwise). The transistors are C945 and 13001. The combination of the diode, the controlled current source and a bipolar transistor models an optоcoupler (NEC 2561A).

published 4 years ago

PrathikP

4 years ago

It's certainly fake. Not proper manufacturer makes a 2 transistor oscillator type SMPS. They always use a proper chip to drive the switching transistor (if it isn't built in, which it quite often is). Good job making it work on every circuit.

stanislav_maslovski

4 years ago

Hi, thanks for comment. I bought this charger for a very little price when traveling. It looked almost like the real one from Samsung, except that the text "Samsung" on the lid was printed in a lower quality ink. So I wanted to see what was inside. Although the circuit is very simple, it is however not without a touch of elegance, IMHO ;-)

PrathikP

4 years ago

The test to determine whether a charger is real or not is very simple. If you can open a charger, it's fake.

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