Universal USB charger UBP-008

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Official specifications:

I bought it from Aliexpress dealer ShenZhen INVOMEN Electronics Co., Ltd.

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I got it in a card board box, it contained the charger and a piece of plastic, no manual or usb cable.

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I supposed the plastic can be used as some sort of cable management.

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Measurements


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The charger can deliver nearly 3A before the output voltage starts dropping and at about 3.8A the overload protection will kick in.

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At 120VAC the current limit is slightly lower.

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No problems running one hour at 2A (The rating says 2A continuous).
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp4112

M1: 66,4C, HS1: 73,5C

Temp4113

M1: 51,7C, M2: 55,9C, HS1: 78,9C

Temp4114

M1: 65,6C, HS1: 77,0C

Temp4115

M1: 56,3C, HS1: 63,7C

Temp4116

M1: 51,6C, M2: 64,9C, HS1: 72,1C


10ohm

At 0.5A the noise is 3mV rms and 83mVpp.

5ohm

At 1A the noise is 3mV rms and 86mVpp.

2ohm

At 2.5A the noise is 21mV rms and 156mVpp, the is very low noise.



Tear down

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A press with my vice and it popped open, this also revealed that there was a screw hidden beneath the label (Oops).

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At the mains input there is a fuse (FU), the switcher IC (U1). There is also a opto coupler (U2) and a reference (U3: TL431). Besides the reference is an output filtering inductor . On the other side of the transformer is the rectifier diode (D3) and the safety capacitor (CY).

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The safety capacitor has a lot of safety approvals.

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The switcher, the opto coupler, the references (3 pin device) and the inductor.

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The only interesting part on this side is the bridge rectifier.

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Safety distance looks acceptable.

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



Conclusion

The charger cannot deliver the rated 3.1A, but can easily deliver 2A and this is enough for most devices. I like the low noise and safety do also looks fairly good.



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?