AIFFECT WHA-1U-10W



Official specifications:

• Input: 100-240V AC 50/60Hz
• Output: 5V 2A

I got it from a reader.



The charger arrived in a cardboard box with not much useful info on it. The box only contained the charger.











Measurements

• Power consumption when idle is 0.05 watt
• USB output is coded as usb charger (DCP)
• Weight: 37.7g
• Size: 81 x 38.5 x 22.2mm

The charger can deliver slightly above 2.2A and has cable compensation.


The charger has no problem delivering 2A for one hour.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.



M1: 51.2°C, HS1: 82.6°C
HS1 must be the snubber network.



M1: 62.8°C, HS1: 65.6°C



M1: 45.2°C, HS1: 56.2°C



M1: 69.4°C, M2: 43.8°C, HS1: 69.7°C
Here HS1 must be the transformer.



M1: 45.1°C, HS1: 82.0°C



Noise at 0.5A load is: 25mV rms and 319mVpp.



Noise at 1A load is: 36mV rms and 294mVpp.



Noise at 2A load is: 43mV rms and 314mVpp.




Tear down



Some pressure with my vice and the lid popped off.



A very typical simple construction for a low power usb supply: At the input is a fusible resistor (FR1) and there is a inductor (L1) between the two smoothing capacitors. There is also a blue safety capacitor.









On this side is the bridge rectifier (BD1), the mains switcher (U1), on the low volt side is a synchronous rectifier chip (U2).





The isolation distance is acceptable.

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



Conclusion

This is a simple charger with no auto coding, but it is coded with DCP and can deliver enough power for that coding.

As a simple charger it is good.



Notes

This charger was donated by a reader for review.

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