Aukey Dual Port Wall Charger PA-U32

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Official specifications: I got it from a Aliexpress dealer: aukey official store

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The box included the charger, a instruction sheet and a warranty card.

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There is a small hole in the front with a weak white led behind it.

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Measurements

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The top output can deliver about 2.4A

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It is the same for the bottom output.

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And also when used in parallel at 120VAC, the limit is slightly higher at 120VAC.

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Or at 230VAC.

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The limit is too close to 2.4A, the charger cannot deliver 2.4A for more than 10 minutes, before output drops.

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Reducing the output to 2.2A helps, now the charger can deliver current for one hour.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp5222

HS1: 68.3C
HS1 is the transformer

Temp5223

M1: 44.5C, M2: 35.8C, HS1: 61.5C
HS1 is the transformer

Temp5224

M1: 45.8C, HS1: 50.2C

Temp5225

M1: 47.9C, HS1: 56.2C

Temp5226

HS1: 69.4C, M1: 57.8C

10ohm

Noise at 0.5A load is: 17mV rms and 803mVpp.

5ohm

Noise at 1A load is: 21mV rms and 715mVpp.

2ohm

Noise at 2.5A load is: 67mV rms and 949mVpp.





Tear down

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My vice could break the glue and the I could pull it apart. The electronic is in a clear plastic holder.

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A few more views of the plastic holder. The electronic is on two circuit boards, one for mains and one for low voltage, due to the plastic holder there is very good isolation between them.

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The two circuit board and the holder.

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One this side is the led and the auto coding chip (U2: CW3004)

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On this side is the rectifying diode.

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This is the mains circuit board with the fuse (FU1) and a inductor (L1) between the two smooting capacitors. There is also a switcher transistor (Q1) between one of the capacitors and the transformer.


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This side has a bridge rectifier (BD1) and a switcher controller (U1).


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This small charger has very good safety distances due to the two circuit board with plastic between.



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



Conclusion

A very small charger with good safety and auto coding, but the total current output is a bit low for a dual output device



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?