2A dual port charger

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Official specifications:
I got it from Ebay dealer double-turbo

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I got this charger in a cardboard box with a picture of the charger on the outside.

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There is a red window on the charger with a led behind. The led shows when the charger is powered.

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Measurements


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The two outputs looks fairly identical because they are running in parallel. The overload protection kicks in between 2.1A and 2.2A

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No problem running at 2A for one hour.

Temp1663

M1: 74,3C, M2: 49,9C, M3: 40,8C, HS1: 75,9C
The charger do get warm at 2A. As usual the output diode do get rather hot.

Temp1664

HS1: 72,2C

Temp1665

M1: 51,2C, M2: 49,0C, M3: 33,5C, HS1: 56,7C

Temp1666

HS1: 55,7C

Temp1667

M1: 57,7C, M2: 43,8C, HS1: 77,9C

10ohm

There is some noise at 0,5A with 58mV rms and 0.56Vpp

2.5ohm

And even more at 2A with 117mV rms and 0.7Vpp




Tear down

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The mains input is very simple, not noise filter or fuses, first component is a bridge rectifier, then the capacitor.

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The isolation is rather bad, CY1 is mounted between the low volt side and the mains. This is NOT a safety capacitor.


The charger passed 2500 volt isolation test, but failed a isolation test with 5000 volt, this makes it doubtful to use with 230VAC mains. The fail made a short between mains and low voltage side (Very bad)!



Conclusion

The load test looks fairly good, but the noise is not as good and when we get to safety it fails completely.

Stay away from this one!



Notes

Read more about how I test USB power supplies/charger