2A Dual port USB

DSC_3324

Official specifications:
I got it from Ebay dealer: cici10086

DSC_3325

DSC_3329

DSC_3326 DSC_3327 DSC_3328





Measurements



2A%20Dual%20port%20USB%20%231%20load%20sweep
2A%20Dual%20port%20USB%20%232%20load%20sweep

Each output can deliver 1A before output voltage drops, there is no overload protection.

2A%20Dual%20port%20USB%20load%20sweep

And because they are in parallel the total output is also 1A.

2A%20Dual%20port%20USB%20load%20test

I could draw 1A for 1 hour without any problems.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp2922

M1: 40,3C, HS1: 47,7C
HS1 must be the transformer.

Temp2923

M1: 44,6C, M2: 47,6C, HS1: 61,5C

Temp2924

M1: 35,8C, HS1: 45,9C

Temp2925

M1: 45,1C, HS1: 49,6C
HS1 must be the transformer.

Temp2926

M1: 43,3C, HS1: 76,0C

10ohm

Noise at 0.5A load is 129mV rms and 670mVpp

5ohm

Noise at 1A load is 217mV rms and 1080mVpp





Tear down

DSC_4115

A hit with my mallet and it was open, nothing is glued together, it is only clips.

DSC_4116

There is a bridge rectifier hidden under the capacitor. The design uses two transistors and has a blue capacitor of 1000 volt type that will short when overvoltage is present (Very bad). There is also a opto coupler and a rectifier diode.

DSC_4118

DSC_4119 DSC_4121

Here the markings on the blue capacitor can be seen and the bridge rectifier below the big capacitor.

DSC_4120

The two transistors are on this side of the circuit board.

DSC_4117

There is only a few resistors on the other side of the circuit board.

DSC_4122


DSC_4132

There is supposed to be about 6mm between low volt side and mains, here is only 1mm.

The charger failed a 2500 volt test and shorted between low volt side and mains, this makes the charger dangerous everywhere.


Conclusion

This charger has very bad safety, stay away.



Notes

Index of all tested USB power supplies/chargers
Read more about how I test USB power supplies/charger