2A Dual EU USB Wall AC Adapter

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Official specifications:
I got it from Ebay dealer: sanheshun I ordered the "HTC One M7 M8 M9" model

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Measurements



2A%20Dual%20EU%20USB%20Wall%20AC%20Adapter%20bottom%20load%20sweep

2A%20Dual%20EU%20USB%20Wall%20AC%20Adapter%20top%20load%20sweep

Each output can deliver 1.6A before output protection trips.

2A%20Dual%20EU%20USB%20Wall%20AC%20Adapter%20load%20sweep

And because they are in parallel the total output is also 1.6A.

2A%20Dual%20EU%20USB%20Wall%20AC%20Adapter%20load%20test

I could draw 1.4A for 1 hour without any problems.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp2927

M1: 72,5C, M2: 72,4C, HS1: 77,1C
HS1 is the transformer and M1 is the rectifier diode.

Temp2928

M1: 69,3C, HS1: 84,5C
HS1 is the rectifier diode.

Temp2929

M1: 70,3C, M2: 72,1C, HS1: 78,0C
HS1 is the rectifier diode and M1 is the transformer.

Temp2930

M1: 49,4C, HS1: 68,0C
HS1 at the back of the usb connectors is the transformer.

Temp2931

M1: 69,6C, HS1: 72,3C
M1 is the rectifier diode and HS1 is the transformer.

10ohm

Noise at 0.5A load is 50mV rms and 856mVpp

5ohm

Noise at 1A load is 71mV rms and 734mVpp



Tear down

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Some pressure in my vice and it popped open.

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On the input there is a resistor instead of a fuse, then the bridge rectifier. Besides the usb connectors is a blue 1000 volt capacitor than will short when the voltage gets too high (Very bad). The rectifier diode is D3.


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On this side there is a switcher IC.

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The usb connectors and the coding is place on a small circuit board that is connected to the main circuit board with wires.

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Between mains and low volt side there is supposed to be over 6mm, here it is around 1.5mm (Very bad).

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



Conclusion

This charger cannot deliver rated current, has some noise on the output and very bad safety, stay away.



Notes

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