Ugreen 3xUSB 3.1A 15.5W ED013

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Official specifications: I got it from aliexpress dealer: Ugreen Official Store

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It included a cable strap outside the box.

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Measurements

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The USB output has overload protection at about 3.3A, this fits nicely with the total rating for the charger, but not with the ports 1A rating. The charger has cable compensation.

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It is not really any surprise that the two other ports looks the same.

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This also means that the curve is the same with all ports in parallel.

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At 120VAC the output current is slightly higher.

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For a load test I used 3.1A load for one hour, it worked fine.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp6872

M1: 47.7C, HS1: 65.3C
HS1 is the transformer an the other hot spot is the synchronous rectifier.

Temp6873

HS1: 61.9C
Here HS1 is due to the switcher IC.

Temp6874

HS1: 67.8C
The transformer is heating the enclosure.

Temp6875

M1: 51.1C, HS1: 63.2C
Here HS1 is the synchronous rectifier.

Temp6876

M1: 45.9C, HS1: 64.8C

10ohm

At 0.5A the noise is 8mV rms and 157mVpp.

5ohm

At 1A the noise is 15mV rms and 268mVpp.

2ohm

At 2.5A the noise is 18mV rms and 331mVpp, this is low noise.





Tear down

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Using my vice to crack the glue, then whacking it with a mallet got it open.

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At the mains input the fuse (F1) is hidden in shrink wrap, there is a common mode coil (L1) between the mains smoothing capacitors (EC1 & ?). There is a safety capacitor (CY1) to the low volt side. The mains switcher is on the other side of the transformer (U1: PN8386: 18W).
There is some clear plastic between mains and low volt side for better protection.

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On this side is the bridge rectifier (DB1), the synchronous rectifier chip (U2: JW7707F: 50V 7mOhm). There is a coding chip (U3: Marked ICS03D) to some of the USB connectors, but I did not see any automatic coding on the USB connectors.
The clear plastic goes through slots in the circuit board and also increases safety on this side.

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Even with all the plastic the final device is a bit low on distance between mains and low volt side, it is only about 5mm and not above 6mm.


Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.



Conclusion

This USB charger is a bit weak for a 3 port charger and is missing a good auto coding, but it works fine with good protection. The safety is slightly low due to the too short distance, but it is not a serious problem.



Notes

Index of all tested USB power supplies/chargers
Read more about how I test USB power supplies/charger
How does a usb charger work?